Deuxfleurs/bagage
16
2
Fork 2
Code Issues 4 Pull requests Projects Releases Wiki Activity

Working on SFTP

Browse source
This commit is contained in:
Quentin 2021-11-19 19:54:49 +01:00
parent 93631b4e3d
commit 0ee29e31dd
Signed by: quentin
GPG key ID: A98E9B769E4FF428
81 changed files with 12748 additions and 154 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
.gitignore vendored
View file

@ -1,2 +1,5 @@
bagage
.env
*.swp
id_rsa
id_rsa.pub

84
auth_ldap.go
View file

@ -18,41 +18,17 @@ type LdapPreAuth struct {
func (l LdapPreAuth) WithCreds(username, password string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var e *LdapWrongPasswordError
// 1. Connect to the server
conn, err := ldapConnect(l.WithConfig)
if err != nil {
l.OnFailure.WithError(err).ServeHTTP(w, r)
return
}
defer conn.Close()
// 2. Authenticate with provided credentials
// @FIXME we should better check the error, it could also be due to an LDAP error
err = conn.auth(username, password)
if err != nil {
access_key, secret_key, err := LdapGetS3(l.WithConfig, username, password)
if err == nil {
l.OnCreds.WithCreds(access_key, secret_key).ServeHTTP(w, r)
} else if errors.As(err, &e) {
l.OnWrongPassword.WithError(err).ServeHTTP(w, r)
return
} else {
l.OnFailure.WithError(e).ServeHTTP(w, r)
}
// 3. Fetch user's profile
profile, err := conn.profile()
if err != nil {
l.OnFailure.WithError(err).ServeHTTP(w, r)
return
}
// 4. Basic checks upon users' attributes
access_key := profile.GetAttributeValue("garage_s3_access_key")
secret_key := profile.GetAttributeValue("garage_s3_secret_key")
if access_key == "" || secret_key == "" {
err = errors.New(fmt.Sprintf("Either access key or secret key is missing in LDAP for %s", conn.userDn))
l.OnFailure.WithError(err).ServeHTTP(w, r)
return
}
// 5. Send fetched credentials to the next middleware
l.OnCreds.WithCreds(access_key, secret_key).ServeHTTP(w, r)
})
}
@ -66,6 +42,50 @@ type ldapConnector struct {
userDn string
}
type LdapError struct {
Username string
Err error
}
func (e *LdapError) Error() string { return "ldap error for "+e.Username+": "+e.Err.Error() }
type LdapWrongPasswordError struct { LdapError }
func LdapGetS3(c *Config, username, password string) (access_key, secret_key string, werr error) {
// 1. Connect to the server
conn, err := ldapConnect(c)
if err != nil {
werr = &LdapError { username, err }
return
}
defer conn.Close()
// 2. Authenticate with provided credentials
// @FIXME we should better check the error, it could also be due to an LDAP error
err = conn.auth(username, password)
if err != nil {
werr = &LdapWrongPasswordError { LdapError { username, err } }
return
}
// 3. Fetch user's profile
profile, err := conn.profile()
if err != nil {
werr = &LdapError { username, err }
return
}
// 4. Basic checks upon users' attributes
access_key = profile.GetAttributeValue("garage_s3_access_key")
secret_key = profile.GetAttributeValue("garage_s3_secret_key")
if access_key == "" || secret_key == "" {
err = errors.New(fmt.Sprintf("Either access key or secret key is missing in LDAP for %s", conn.userDn))
werr = &LdapError { username, err }
return
}
// 5. Send fetched credentials to the next middleware
return
}
func ldapConnect(c *Config) (ldapConnector, error) {
ldapSock, err := ldap.Dial("tcp", c.LdapServer)
if err != nil {

1
config.go
View file

@ -14,6 +14,7 @@ type Config struct {
UserNameAttr string `env:"BAGAGE_LDAP_USERNAME_ATTR" default:"cn"`
Endpoint string `env:"BAGAGE_S3_ENDPOINT" default:"garage.deuxfleurs.fr"`
UseSSL bool `env:"BAGAGE_S3_SSL" default:"true"`
SSHKey string `env:"BAGAGE_SSH_KEY" default:"id_rsa"`
}
func (c *Config) LoadWithDefault() *Config {

3
go.mod
View file

@ -4,6 +4,9 @@ go 1.16
require (
github.com/go-ldap/ldap/v3 v3.4.1
github.com/kr/fs v0.1.0
github.com/minio/minio-go/v7 v7.0.12
github.com/pkg/sftp v1.13.4
golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b
golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d
)

18
go.sum
View file

@ -21,6 +21,8 @@ github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfV
github.com/klauspost/cpuid v1.2.3/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
github.com/klauspost/cpuid v1.3.1 h1:5JNjFYYQrZeKRJ0734q51WCEEn2huer72Dc7K+R/b6s=
github.com/klauspost/cpuid v1.3.1/go.mod h1:bYW4mA6ZgKPob1/Dlai2LviZJO7KGI3uoWLd42rAQw4=
github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
@ -38,6 +40,8 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJ
github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/pkg/sftp v1.13.4 h1:Lb0RYJCmgUcBgZosfoi9Y9sbl6+LJgOIgk/2Y4YjMFg=
github.com/pkg/sftp v1.13.4/go.mod h1:LzqnAvaD5TWeNBsZpfKxSYn1MbjWwOsCIAFFJbpIsK8=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rs/xid v1.2.1 h1:mhH9Nq+C1fY2l1XIpgxIiUOfNpRBYH1kKcr+qfKgjRc=
@ -51,16 +55,19 @@ github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f h1:aZp0e2vLN4MToVqnjNEYEtrEA8RH8U8FN1CU7JgqsPU=
golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b h1:7mWr3k41Qtv8XlltBkDkl8LoP3mpSgBW8BUoxtEdbXg=
golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d h1:LO7XpTYMwTqxjLcGWPijK3vRXg1aWdlNOVOHRq45d7c=
golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@ -69,9 +76,11 @@ golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c=
golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7 h1:iGu644GcxtEcrInvDsQRCwJjtCIOlT2V7IRt6ah2Whw=
golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
@ -84,5 +93,6 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8
gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

326
internal/encoding/ssh/filexfer/attrs.go Normal file
View file

@ -0,0 +1,326 @@
package filexfer
// Attributes related flags.
const (
AttrSize = 1 << iota // SSH_FILEXFER_ATTR_SIZE
AttrUIDGID // SSH_FILEXFER_ATTR_UIDGID
AttrPermissions // SSH_FILEXFER_ATTR_PERMISSIONS
AttrACModTime // SSH_FILEXFER_ACMODTIME
AttrExtended = 1 << 31 // SSH_FILEXFER_ATTR_EXTENDED
)
// Attributes defines the file attributes type defined in draft-ietf-secsh-filexfer-02
//
// Defined in: https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-5
type Attributes struct {
Flags uint32
// AttrSize
Size uint64
// AttrUIDGID
UID uint32
GID uint32
// AttrPermissions
Permissions FileMode
// AttrACmodTime
ATime uint32
MTime uint32
// AttrExtended
ExtendedAttributes []ExtendedAttribute
}
// GetSize returns the Size field and a bool that is true if and only if the value is valid/defined.
func (a *Attributes) GetSize() (size uint64, ok bool) {
return a.Size, a.Flags&AttrSize != 0
}
// SetSize is a convenience function that sets the Size field,
// and marks the field as valid/defined in Flags.
func (a *Attributes) SetSize(size uint64) {
a.Flags |= AttrSize
a.Size = size
}
// GetUIDGID returns the UID and GID fields and a bool that is true if and only if the values are valid/defined.
func (a *Attributes) GetUIDGID() (uid, gid uint32, ok bool) {
return a.UID, a.GID, a.Flags&AttrUIDGID != 0
}
// SetUIDGID is a convenience function that sets the UID and GID fields,
// and marks the fields as valid/defined in Flags.
func (a *Attributes) SetUIDGID(uid, gid uint32) {
a.Flags |= AttrUIDGID
a.UID = uid
a.GID = gid
}
// GetPermissions returns the Permissions field and a bool that is true if and only if the value is valid/defined.
func (a *Attributes) GetPermissions() (perms FileMode, ok bool) {
return a.Permissions, a.Flags&AttrPermissions != 0
}
// SetPermissions is a convenience function that sets the Permissions field,
// and marks the field as valid/defined in Flags.
func (a *Attributes) SetPermissions(perms FileMode) {
a.Flags |= AttrPermissions
a.Permissions = perms
}
// GetACModTime returns the ATime and MTime fields and a bool that is true if and only if the values are valid/defined.
func (a *Attributes) GetACModTime() (atime, mtime uint32, ok bool) {
return a.ATime, a.MTime, a.Flags&AttrACModTime != 0
return a.ATime, a.MTime, a.Flags&AttrACModTime != 0
}
// SetACModTime is a convenience function that sets the ATime and MTime fields,
// and marks the fields as valid/defined in Flags.
func (a *Attributes) SetACModTime(atime, mtime uint32) {
a.Flags |= AttrACModTime
a.ATime = atime
a.MTime = mtime
}
// Len returns the number of bytes a would marshal into.
func (a *Attributes) Len() int {
length := 4
if a.Flags&AttrSize != 0 {
length += 8
}
if a.Flags&AttrUIDGID != 0 {
length += 4 + 4
}
if a.Flags&AttrPermissions != 0 {
length += 4
}
if a.Flags&AttrACModTime != 0 {
length += 4 + 4
}
if a.Flags&AttrExtended != 0 {
length += 4
for _, ext := range a.ExtendedAttributes {
length += ext.Len()
}
}
return length
}
// MarshalInto marshals e onto the end of the given Buffer.
func (a *Attributes) MarshalInto(b *Buffer) {
b.AppendUint32(a.Flags)
if a.Flags&AttrSize != 0 {
b.AppendUint64(a.Size)
}
if a.Flags&AttrUIDGID != 0 {
b.AppendUint32(a.UID)
b.AppendUint32(a.GID)
}
if a.Flags&AttrPermissions != 0 {
b.AppendUint32(uint32(a.Permissions))
}
if a.Flags&AttrACModTime != 0 {
b.AppendUint32(a.ATime)
b.AppendUint32(a.MTime)
}
if a.Flags&AttrExtended != 0 {
b.AppendUint32(uint32(len(a.ExtendedAttributes)))
for _, ext := range a.ExtendedAttributes {
ext.MarshalInto(b)
}
}
}
// MarshalBinary returns a as the binary encoding of a.
func (a *Attributes) MarshalBinary() ([]byte, error) {
buf := NewBuffer(make([]byte, 0, a.Len()))
a.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom unmarshals an Attributes from the given Buffer into e.
//
// NOTE: The values of fields not covered in the a.Flags are explicitly undefined.
func (a *Attributes) UnmarshalFrom(b *Buffer) (err error) {
flags, err := b.ConsumeUint32()
if err != nil {
return err
}
return a.XXX_UnmarshalByFlags(flags, b)
}
// XXX_UnmarshalByFlags uses the pre-existing a.Flags field to determine which fields to decode.
// DO NOT USE THIS: it is an anti-corruption function to implement existing internal usage in pkg/sftp.
// This function is not a part of any compatibility promise.
func (a *Attributes) XXX_UnmarshalByFlags(flags uint32, b *Buffer) (err error) {
a.Flags = flags
// Short-circuit dummy attributes.
if a.Flags == 0 {
return nil
}
if a.Flags&AttrSize != 0 {
if a.Size, err = b.ConsumeUint64(); err != nil {
return err
}
}
if a.Flags&AttrUIDGID != 0 {
if a.UID, err = b.ConsumeUint32(); err != nil {
return err
}
if a.GID, err = b.ConsumeUint32(); err != nil {
return err
}
}
if a.Flags&AttrPermissions != 0 {
m, err := b.ConsumeUint32()
if err != nil {
return err
}
a.Permissions = FileMode(m)
}
if a.Flags&AttrACModTime != 0 {
if a.ATime, err = b.ConsumeUint32(); err != nil {
return err
}
if a.MTime, err = b.ConsumeUint32(); err != nil {
return err
}
}
if a.Flags&AttrExtended != 0 {
count, err := b.ConsumeUint32()
if err != nil {
return err
}
a.ExtendedAttributes = make([]ExtendedAttribute, count)
for i := range a.ExtendedAttributes {
a.ExtendedAttributes[i].UnmarshalFrom(b)
}
}
return nil
}
// UnmarshalBinary decodes the binary encoding of Attributes into e.
func (a *Attributes) UnmarshalBinary(data []byte) error {
return a.UnmarshalFrom(NewBuffer(data))
}
// ExtendedAttribute defines the extended file attribute type defined in draft-ietf-secsh-filexfer-02
//
// Defined in: https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-5
type ExtendedAttribute struct {
Type string
Data string
}
// Len returns the number of bytes e would marshal into.
func (e *ExtendedAttribute) Len() int {
return 4 + len(e.Type) + 4 + len(e.Data)
}
// MarshalInto marshals e onto the end of the given Buffer.
func (e *ExtendedAttribute) MarshalInto(b *Buffer) {
b.AppendString(e.Type)
b.AppendString(e.Data)
}
// MarshalBinary returns e as the binary encoding of e.
func (e *ExtendedAttribute) MarshalBinary() ([]byte, error) {
buf := NewBuffer(make([]byte, 0, e.Len()))
e.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom unmarshals an ExtendedAattribute from the given Buffer into e.
func (e *ExtendedAttribute) UnmarshalFrom(b *Buffer) (err error) {
if e.Type, err = b.ConsumeString(); err != nil {
return err
}
if e.Data, err = b.ConsumeString(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the binary encoding of ExtendedAttribute into e.
func (e *ExtendedAttribute) UnmarshalBinary(data []byte) error {
return e.UnmarshalFrom(NewBuffer(data))
}
// NameEntry implements the SSH_FXP_NAME repeated data type from draft-ietf-secsh-filexfer-02
//
// This type is incompatible with versions 4 or higher.
type NameEntry struct {
Filename string
Longname string
Attrs Attributes
}
// Len returns the number of bytes e would marshal into.
func (e *NameEntry) Len() int {
return 4 + len(e.Filename) + 4 + len(e.Longname) + e.Attrs.Len()
}
// MarshalInto marshals e onto the end of the given Buffer.
func (e *NameEntry) MarshalInto(b *Buffer) {
b.AppendString(e.Filename)
b.AppendString(e.Longname)
e.Attrs.MarshalInto(b)
}
// MarshalBinary returns e as the binary encoding of e.
func (e *NameEntry) MarshalBinary() ([]byte, error) {
buf := NewBuffer(make([]byte, 0, e.Len()))
e.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom unmarshals an NameEntry from the given Buffer into e.
//
// NOTE: The values of fields not covered in the a.Flags are explicitly undefined.
func (e *NameEntry) UnmarshalFrom(b *Buffer) (err error) {
if e.Filename, err = b.ConsumeString(); err != nil {
return err
}
if e.Longname, err = b.ConsumeString(); err != nil {
return err
}
return e.Attrs.UnmarshalFrom(b)
}
// UnmarshalBinary decodes the binary encoding of NameEntry into e.
func (e *NameEntry) UnmarshalBinary(data []byte) error {
return e.UnmarshalFrom(NewBuffer(data))
}

231
internal/encoding/ssh/filexfer/attrs_test.go Normal file
View file

@ -0,0 +1,231 @@
package filexfer
import (
"bytes"
"testing"
)
func TestAttributes(t *testing.T) {
const (
size = 0x123456789ABCDEF0
uid = 1000
gid = 100
perms = 0x87654321
atime = 0x2A2B2C2D
mtime = 0x42434445
)
extAttr := ExtendedAttribute{
Type: "foo",
Data: "bar",
}
attr := &Attributes{
Size: size,
UID: uid,
GID: gid,
Permissions: perms,
ATime: atime,
MTime: mtime,
ExtendedAttributes: []ExtendedAttribute{
extAttr,
},
}
type test struct {
name string
flags uint32
encoded []byte
}
tests := []test{
{
name: "empty",
encoded: []byte{
0x00, 0x00, 0x00, 0x00,
},
},
{
name: "size",
flags: AttrSize,
encoded: []byte{
0x00, 0x00, 0x00, 0x01,
0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0,
},
},
{
name: "uidgid",
flags: AttrUIDGID,
encoded: []byte{
0x00, 0x00, 0x00, 0x02,
0x00, 0x00, 0x03, 0xE8,
0x00, 0x00, 0x00, 100,
},
},
{
name: "permissions",
flags: AttrPermissions,
encoded: []byte{
0x00, 0x00, 0x00, 0x04,
0x87, 0x65, 0x43, 0x21,
},
},
{
name: "acmodtime",
flags: AttrACModTime,
encoded: []byte{
0x00, 0x00, 0x00, 0x08,
0x2A, 0x2B, 0x2C, 0x2D,
0x42, 0x43, 0x44, 0x45,
},
},
{
name: "extended",
flags: AttrExtended,
encoded: []byte{
0x80, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x03, 'f', 'o', 'o',
0x00, 0x00, 0x00, 0x03, 'b', 'a', 'r',
},
},
{
name: "size uidgid permisssions acmodtime extended",
flags: AttrSize | AttrUIDGID | AttrPermissions | AttrACModTime | AttrExtended,
encoded: []byte{
0x80, 0x00, 0x00, 0x0F,
0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0,
0x00, 0x00, 0x03, 0xE8,
0x00, 0x00, 0x00, 100,
0x87, 0x65, 0x43, 0x21,
0x2A, 0x2B, 0x2C, 0x2D,
0x42, 0x43, 0x44, 0x45,
0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x03, 'f', 'o', 'o',
0x00, 0x00, 0x00, 0x03, 'b', 'a', 'r',
},
},
}
for _, tt := range tests {
attr := *attr
t.Run(tt.name, func(t *testing.T) {
attr.Flags = tt.flags
buf, err := attr.MarshalBinary()
if err != nil {
t.Fatal("unexpected error:", err)
}
if !bytes.Equal(buf, tt.encoded) {
t.Fatalf("MarshalBinary() = %X, but wanted %X", buf, tt.encoded)
}
attr = Attributes{}
if err := attr.UnmarshalBinary(buf); err != nil {
t.Fatal("unexpected error:", err)
}
if attr.Flags != tt.flags {
t.Errorf("UnmarshalBinary(): Flags was %x, but wanted %x", attr.Flags, tt.flags)
}
if attr.Flags&AttrSize != 0 && attr.Size != size {
t.Errorf("UnmarshalBinary(): Size was %x, but wanted %x", attr.Size, size)
}
if attr.Flags&AttrUIDGID != 0 {
if attr.UID != uid {
t.Errorf("UnmarshalBinary(): UID was %x, but wanted %x", attr.UID, uid)
}
if attr.GID != gid {
t.Errorf("UnmarshalBinary(): GID was %x, but wanted %x", attr.GID, gid)
}
}
if attr.Flags&AttrPermissions != 0 && attr.Permissions != perms {
t.Errorf("UnmarshalBinary(): Permissions was %#v, but wanted %#v", attr.Permissions, perms)
}
if attr.Flags&AttrACModTime != 0 {
if attr.ATime != atime {
t.Errorf("UnmarshalBinary(): ATime was %x, but wanted %x", attr.ATime, atime)
}
if attr.MTime != mtime {
t.Errorf("UnmarshalBinary(): MTime was %x, but wanted %x", attr.MTime, mtime)
}
}
if attr.Flags&AttrExtended != 0 {
extAttrs := attr.ExtendedAttributes
if count := len(extAttrs); count != 1 {
t.Fatalf("UnmarshalBinary(): len(ExtendedAttributes) was %d, but wanted %d", count, 1)
}
if got := extAttrs[0]; got != extAttr {
t.Errorf("UnmarshalBinary(): ExtendedAttributes[0] was %#v, but wanted %#v", got, extAttr)
}
}
})
}
}
func TestNameEntry(t *testing.T) {
const (
filename = "foo"
longname = "bar"
perms = 0x87654321
)
e := &NameEntry{
Filename: filename,
Longname: longname,
Attrs: Attributes{
Flags: AttrPermissions,
Permissions: perms,
},
}
buf, err := e.MarshalBinary()
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 0x03, 'f', 'o', 'o',
0x00, 0x00, 0x00, 0x03, 'b', 'a', 'r',
0x00, 0x00, 0x00, 0x04,
0x87, 0x65, 0x43, 0x21,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalBinary() = %X, but wanted %X", buf, want)
}
*e = NameEntry{}
if err := e.UnmarshalBinary(buf); err != nil {
t.Fatal("unexpected error:", err)
}
if e.Filename != filename {
t.Errorf("UnmarhsalFrom(): Filename was %q, but expected %q", e.Filename, filename)
}
if e.Longname != longname {
t.Errorf("UnmarhsalFrom(): Longname was %q, but expected %q", e.Longname, longname)
}
if e.Attrs.Flags != AttrPermissions {
t.Errorf("UnmarshalBinary(): Attrs.Flag was %#x, but expected %#x", e.Attrs.Flags, AttrPermissions)
}
if e.Attrs.Permissions != perms {
t.Errorf("UnmarshalBinary(): Attrs.Permissions was %#v, but expected %#v", e.Attrs.Permissions, perms)
}
}

293
internal/encoding/ssh/filexfer/buffer.go Normal file
View file

@ -0,0 +1,293 @@
package filexfer
import (
"encoding/binary"
"errors"
)
// Various encoding errors.
var (
ErrShortPacket = errors.New("packet too short")
ErrLongPacket = errors.New("packet too long")
)
// Buffer wraps up the various encoding details of the SSH format.
//
// Data types are encoded as per section 4 from https://tools.ietf.org/html/draft-ietf-secsh-architecture-09#page-8
type Buffer struct {
b []byte
off int
}
// NewBuffer creates and initializes a new buffer using buf as its initial contents.
// The new buffer takes ownership of buf, and the caller should not use buf after this call.
//
// In most cases, new(Buffer) (or just declaring a Buffer variable) is sufficient to initialize a Buffer.
func NewBuffer(buf []byte) *Buffer {
return &Buffer{
b: buf,
}
}
// NewMarshalBuffer creates a new Buffer ready to start marshaling a Packet into.
// It preallocates enough space for uint32(length), uint8(type), uint32(request-id) and size more bytes.
func NewMarshalBuffer(size int) *Buffer {
return NewBuffer(make([]byte, 4+1+4+size))
}
// Bytes returns a slice of length b.Len() holding the unconsumed bytes in the Buffer.
// The slice is valid for use only until the next buffer modification
// (that is, only until the next call to an Append or Consume method).
func (b *Buffer) Bytes() []byte {
return b.b[b.off:]
}
// Len returns the number of unconsumed bytes in the buffer.
func (b *Buffer) Len() int { return len(b.b) - b.off }
// Cap returns the capacity of the buffer’s underlying byte slice,
// that is, the total space allocated for the buffer’s data.
func (b *Buffer) Cap() int { return cap(b.b) }
// Reset resets the buffer to be empty, but it retains the underlying storage for use by future Appends.
func (b *Buffer) Reset() {
b.b = b.b[:0]
b.off = 0
}
// StartPacket resets and initializes the buffer to be ready to start marshaling a packet into.
// It truncates the buffer, reserves space for uint32(length), then appends the given packetType and requestID.
func (b *Buffer) StartPacket(packetType PacketType, requestID uint32) {
b.b, b.off = append(b.b[:0], make([]byte, 4)...), 0
b.AppendUint8(uint8(packetType))
b.AppendUint32(requestID)
}
// Packet finalizes the packet started from StartPacket.
// It is expected that this will end the ownership of the underlying byte-slice,
// and so the returned byte-slices may be reused the same as any other byte-slice,
// the caller should not use this buffer after this call.
//
// It writes the packet body length into the first four bytes of the buffer in network byte order (big endian).
// The packet body length is the length of this buffer less the 4-byte length itself, plus the length of payload.
//
// It is assumed that no Consume methods have been called on this buffer,
// and so it returns the whole underlying slice.
func (b *Buffer) Packet(payload []byte) (header, payloadPassThru []byte, err error) {
b.PutLength(len(b.b) - 4 + len(payload))
return b.b, payload, nil
}
// ConsumeUint8 consumes a single byte from the buffer.
// If the buffer does not have enough data, it will return ErrShortPacket.
func (b *Buffer) ConsumeUint8() (uint8, error) {
if b.Len() < 1 {
return 0, ErrShortPacket
}
var v uint8
v, b.off = b.b[b.off], b.off+1
return v, nil
}
// AppendUint8 appends a single byte into the buffer.
func (b *Buffer) AppendUint8(v uint8) {
b.b = append(b.b, v)
}
// ConsumeBool consumes a single byte from the buffer, and returns true if that byte is non-zero.
// If the buffer does not have enough data, it will return ErrShortPacket.
func (b *Buffer) ConsumeBool() (bool, error) {
v, err := b.ConsumeUint8()
if err != nil {
return false, err
}
return v != 0, nil
}
// AppendBool appends a single bool into the buffer.
// It encodes it as a single byte, with false as 0, and true as 1.
func (b *Buffer) AppendBool(v bool) {
if v {
b.AppendUint8(1)
} else {
b.AppendUint8(0)
}
}
// ConsumeUint16 consumes a single uint16 from the buffer, in network byte order (big-endian).
// If the buffer does not have enough data, it will return ErrShortPacket.
func (b *Buffer) ConsumeUint16() (uint16, error) {
if b.Len() < 2 {
return 0, ErrShortPacket
}
v := binary.BigEndian.Uint16(b.b[b.off:])
b.off += 2
return v, nil
}
// AppendUint16 appends single uint16 into the buffer, in network byte order (big-endian).
func (b *Buffer) AppendUint16(v uint16) {
b.b = append(b.b,
byte(v>>8),
byte(v>>0),
)
}
// unmarshalUint32 is used internally to read the packet length.
// It is unsafe, and so not exported.
// Even within this package, its use should be avoided.
func unmarshalUint32(b []byte) uint32 {
return binary.BigEndian.Uint32(b[:4])
}
// ConsumeUint32 consumes a single uint32 from the buffer, in network byte order (big-endian).
// If the buffer does not have enough data, it will return ErrShortPacket.
func (b *Buffer) ConsumeUint32() (uint32, error) {
if b.Len() < 4 {
return 0, ErrShortPacket
}
v := binary.BigEndian.Uint32(b.b[b.off:])
b.off += 4
return v, nil
}
// AppendUint32 appends a single uint32 into the buffer, in network byte order (big-endian).
func (b *Buffer) AppendUint32(v uint32) {
b.b = append(b.b,
byte(v>>24),
byte(v>>16),
byte(v>>8),
byte(v>>0),
)
}
// ConsumeUint64 consumes a single uint64 from the buffer, in network byte order (big-endian).
// If the buffer does not have enough data, it will return ErrShortPacket.
func (b *Buffer) ConsumeUint64() (uint64, error) {
if b.Len() < 8 {
return 0, ErrShortPacket
}
v := binary.BigEndian.Uint64(b.b[b.off:])
b.off += 8
return v, nil
}
// AppendUint64 appends a single uint64 into the buffer, in network byte order (big-endian).
func (b *Buffer) AppendUint64(v uint64) {
b.b = append(b.b,
byte(v>>56),
byte(v>>48),
byte(v>>40),
byte(v>>32),
byte(v>>24),
byte(v>>16),
byte(v>>8),
byte(v>>0),
)
}
// ConsumeInt64 consumes a single int64 from the buffer, in network byte order (big-endian) with two’s complement.
// If the buffer does not have enough data, it will return ErrShortPacket.
func (b *Buffer) ConsumeInt64() (int64, error) {
u, err := b.ConsumeUint64()
if err != nil {
return 0, err
}
return int64(u), err
}
// AppendInt64 appends a single int64 into the buffer, in network byte order (big-endian) with two’s complement.
func (b *Buffer) AppendInt64(v int64) {
b.AppendUint64(uint64(v))
}
// ConsumeByteSlice consumes a single string of raw binary data from the buffer.
// A string is a uint32 length, followed by that number of raw bytes.
// If the buffer does not have enough data, or defines a length larger than available, it will return ErrShortPacket.
//
// The returned slice aliases the buffer contents, and is valid only as long as the buffer is not reused
// (that is, only until the next call to Reset, PutLength, StartPacket, or UnmarshalBinary).
//
// In no case will any Consume calls return overlapping slice aliases,
// and Append calls are guaranteed to not disturb this slice alias.
func (b *Buffer) ConsumeByteSlice() ([]byte, error) {
length, err := b.ConsumeUint32()
if err != nil {
return nil, err
}
if b.Len() < int(length) {
return nil, ErrShortPacket
}
v := b.b[b.off:]
if len(v) > int(length) {
v = v[:length:length]
}
b.off += int(length)
return v, nil
}
// AppendByteSlice appends a single string of raw binary data into the buffer.
// A string is a uint32 length, followed by that number of raw bytes.
func (b *Buffer) AppendByteSlice(v []byte) {
b.AppendUint32(uint32(len(v)))
b.b = append(b.b, v...)
}
// ConsumeString consumes a single string of binary data from the buffer.
// A string is a uint32 length, followed by that number of raw bytes.
// If the buffer does not have enough data, or defines a length larger than available, it will return ErrShortPacket.
//
// NOTE: Go implicitly assumes that strings contain UTF-8 encoded data.
// All caveats on using arbitrary binary data in Go strings applies.
func (b *Buffer) ConsumeString() (string, error) {
v, err := b.ConsumeByteSlice()
if err != nil {
return "", err
}
return string(v), nil
}
// AppendString appends a single string of binary data into the buffer.
// A string is a uint32 length, followed by that number of raw bytes.
func (b *Buffer) AppendString(v string) {
b.AppendByteSlice([]byte(v))
}
// PutLength writes the given size into the first four bytes of the buffer in network byte order (big endian).
func (b *Buffer) PutLength(size int) {
if len(b.b) < 4 {
b.b = append(b.b, make([]byte, 4-len(b.b))...)
}
binary.BigEndian.PutUint32(b.b, uint32(size))
}
// MarshalBinary returns a clone of the full internal buffer.
func (b *Buffer) MarshalBinary() ([]byte, error) {
clone := make([]byte, len(b.b))
n := copy(clone, b.b)
return clone[:n], nil
}
// UnmarshalBinary sets the internal buffer of b to be a clone of data, and zeros the internal offset.
func (b *Buffer) UnmarshalBinary(data []byte) error {
if grow := len(data) - len(b.b); grow > 0 {
b.b = append(b.b, make([]byte, grow)...)
}
n := copy(b.b, data)
b.b = b.b[:n]
b.off = 0
return nil
}

142
internal/encoding/ssh/filexfer/extended_packets.go Normal file
View file

@ -0,0 +1,142 @@
package filexfer
import (
"encoding"
"sync"
)
// ExtendedData aliases the untyped interface composition of encoding.BinaryMarshaler and encoding.BinaryUnmarshaler.
type ExtendedData = interface {
encoding.BinaryMarshaler
encoding.BinaryUnmarshaler
}
// ExtendedDataConstructor defines a function that returns a new(ArbitraryExtendedPacket).
type ExtendedDataConstructor func() ExtendedData
var extendedPacketTypes = struct {
mu sync.RWMutex
constructors map[string]ExtendedDataConstructor
}{
constructors: make(map[string]ExtendedDataConstructor),
}
// RegisterExtendedPacketType defines a specific ExtendedDataConstructor for the given extension string.
func RegisterExtendedPacketType(extension string, constructor ExtendedDataConstructor) {
extendedPacketTypes.mu.Lock()
defer extendedPacketTypes.mu.Unlock()
if _, exist := extendedPacketTypes.constructors[extension]; exist {
panic("encoding/ssh/filexfer: multiple registration of extended packet type " + extension)
}
extendedPacketTypes.constructors[extension] = constructor
}
func newExtendedPacket(extension string) ExtendedData {
extendedPacketTypes.mu.RLock()
defer extendedPacketTypes.mu.RUnlock()
if f := extendedPacketTypes.constructors[extension]; f != nil {
return f()
}
return new(Buffer)
}
// ExtendedPacket defines the SSH_FXP_CLOSE packet.
type ExtendedPacket struct {
ExtendedRequest string
Data ExtendedData
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *ExtendedPacket) Type() PacketType {
return PacketTypeExtended
}
// MarshalPacket returns p as a two-part binary encoding of p.
//
// The Data is marshaled into binary, and returned as the payload.
func (p *ExtendedPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.ExtendedRequest) // string(extended-request)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeExtended, reqid)
buf.AppendString(p.ExtendedRequest)
if p.Data != nil {
payload, err = p.Data.MarshalBinary()
if err != nil {
return nil, nil, err
}
}
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
//
// If p.Data is nil, and the extension has been registered, a new type will be made from the registration.
// If the extension has not been registered, then a new Buffer will be allocated.
// Then the request-specific-data will be unmarshaled from the rest of the buffer.
func (p *ExtendedPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.ExtendedRequest, err = buf.ConsumeString(); err != nil {
return err
}
if p.Data == nil {
p.Data = newExtendedPacket(p.ExtendedRequest)
}
return p.Data.UnmarshalBinary(buf.Bytes())
}
// ExtendedReplyPacket defines the SSH_FXP_CLOSE packet.
type ExtendedReplyPacket struct {
Data ExtendedData
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *ExtendedReplyPacket) Type() PacketType {
return PacketTypeExtendedReply
}
// MarshalPacket returns p as a two-part binary encoding of p.
//
// The Data is marshaled into binary, and returned as the payload.
func (p *ExtendedReplyPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
buf = NewMarshalBuffer(0)
}
buf.StartPacket(PacketTypeExtendedReply, reqid)
if p.Data != nil {
payload, err = p.Data.MarshalBinary()
if err != nil {
return nil, nil, err
}
}
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
//
// If p.Data is nil, and there is request-specific-data,
// then the request-specific-data will be wrapped in a Buffer and assigned to p.Data.
func (p *ExtendedReplyPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Data == nil {
p.Data = new(Buffer)
}
return p.Data.UnmarshalBinary(buf.Bytes())
}

240
internal/encoding/ssh/filexfer/extended_packets_test.go Normal file
View file

@ -0,0 +1,240 @@
package filexfer
import (
"bytes"
"testing"
)
type testExtendedData struct {
value uint8
}
func (d *testExtendedData) MarshalBinary() ([]byte, error) {
buf := NewBuffer(make([]byte, 0, 4))
buf.AppendUint8(d.value ^ 0x2a)
return buf.Bytes(), nil
}
func (d *testExtendedData) UnmarshalBinary(data []byte) error {
buf := NewBuffer(data)
v, err := buf.ConsumeUint8()
if err != nil {
return err
}
d.value = v ^ 0x2a
return nil
}
var _ Packet = &ExtendedPacket{}
func TestExtendedPacketNoData(t *testing.T) {
const (
id = 42
extendedRequest = "foo@example"
)
p := &ExtendedPacket{
ExtendedRequest: extendedRequest,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 20,
200,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 11, 'f', 'o', 'o', '@', 'e', 'x', 'a', 'm', 'p', 'l', 'e',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ExtendedPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extendedRequest {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extendedRequest)
}
}
func TestExtendedPacketTestData(t *testing.T) {
const (
id = 42
extendedRequest = "foo@example"
textValue = 13
)
const value = 13
p := &ExtendedPacket{
ExtendedRequest: extendedRequest,
Data: &testExtendedData{
value: textValue,
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 21,
200,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 11, 'f', 'o', 'o', '@', 'e', 'x', 'a', 'm', 'p', 'l', 'e',
0x27,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ExtendedPacket{
Data: new(testExtendedData),
}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extendedRequest {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extendedRequest)
}
if buf, ok := p.Data.(*testExtendedData); !ok {
t.Errorf("UnmarshalPacketBody(): Data was type %T, but expected %T", p.Data, buf)
} else if buf.value != value {
t.Errorf("UnmarshalPacketBody(): Data.value was %#x, but expected %#x", buf.value, value)
}
*p = ExtendedPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extendedRequest {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extendedRequest)
}
wantBuffer := []byte{0x27}
if buf, ok := p.Data.(*Buffer); !ok {
t.Errorf("UnmarshalPacketBody(): Data was type %T, but expected %T", p.Data, buf)
} else if !bytes.Equal(buf.b, wantBuffer) {
t.Errorf("UnmarshalPacketBody(): Data was %X, but expected %X", buf.b, wantBuffer)
}
}
var _ Packet = &ExtendedReplyPacket{}
func TestExtendedReplyNoData(t *testing.T) {
const (
id = 42
)
p := &ExtendedReplyPacket{}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 5,
201,
0x00, 0x00, 0x00, 42,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ExtendedReplyPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
}
func TestExtendedReplyPacketTestData(t *testing.T) {
const (
id = 42
textValue = 13
)
const value = 13
p := &ExtendedReplyPacket{
Data: &testExtendedData{
value: textValue,
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 6,
201,
0x00, 0x00, 0x00, 42,
0x27,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ExtendedReplyPacket{
Data: new(testExtendedData),
}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if buf, ok := p.Data.(*testExtendedData); !ok {
t.Errorf("UnmarshalPacketBody(): Data was type %T, but expected %T", p.Data, buf)
} else if buf.value != value {
t.Errorf("UnmarshalPacketBody(): Data.value was %#x, but expected %#x", buf.value, value)
}
*p = ExtendedReplyPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
wantBuffer := []byte{0x27}
if buf, ok := p.Data.(*Buffer); !ok {
t.Errorf("UnmarshalPacketBody(): Data was type %T, but expected %T", p.Data, buf)
} else if !bytes.Equal(buf.b, wantBuffer) {
t.Errorf("UnmarshalPacketBody(): Data was %X, but expected %X", buf.b, wantBuffer)
}
}

46
internal/encoding/ssh/filexfer/extensions.go Normal file
View file

@ -0,0 +1,46 @@
package filexfer
// ExtensionPair defines the extension-pair type defined in draft-ietf-secsh-filexfer-13.
// This type is backwards-compatible with how draft-ietf-secsh-filexfer-02 defines extensions.
//
// Defined in: https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-4.2
type ExtensionPair struct {
Name string
Data string
}
// Len returns the number of bytes e would marshal into.
func (e *ExtensionPair) Len() int {
return 4 + len(e.Name) + 4 + len(e.Data)
}
// MarshalInto marshals e onto the end of the given Buffer.
func (e *ExtensionPair) MarshalInto(buf *Buffer) {
buf.AppendString(e.Name)
buf.AppendString(e.Data)
}
// MarshalBinary returns e as the binary encoding of e.
func (e *ExtensionPair) MarshalBinary() ([]byte, error) {
buf := NewBuffer(make([]byte, 0, e.Len()))
e.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom unmarshals an ExtensionPair from the given Buffer into e.
func (e *ExtensionPair) UnmarshalFrom(buf *Buffer) (err error) {
if e.Name, err = buf.ConsumeString(); err != nil {
return err
}
if e.Data, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the binary encoding of ExtensionPair into e.
func (e *ExtensionPair) UnmarshalBinary(data []byte) error {
return e.UnmarshalFrom(NewBuffer(data))
}

49
internal/encoding/ssh/filexfer/extensions_test.go Normal file
View file

@ -0,0 +1,49 @@
package filexfer
import (
"bytes"
"testing"
)
func TestExtensionPair(t *testing.T) {
const (
name = "foo"
data = "1"
)
pair := &ExtensionPair{
Name: name,
Data: data,
}
buf, err := pair.MarshalBinary()
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 3,
'f', 'o', 'o',
0x00, 0x00, 0x00, 1,
'1',
}
if !bytes.Equal(buf, want) {
t.Errorf("ExtensionPair.MarshalBinary() = %X, but wanted %X", buf, want)
}
*pair = ExtensionPair{}
if err := pair.UnmarshalBinary(buf); err != nil {
t.Fatal("unexpected error:", err)
}
if pair.Name != name {
t.Errorf("ExtensionPair.UnmarshalBinary(): Name was %q, but expected %q", pair.Name, name)
}
if pair.Data != data {
t.Errorf("RawPacket.UnmarshalBinary(): Data was %q, but expected %q", pair.Data, data)
}
}

54
internal/encoding/ssh/filexfer/filexfer.go Normal file
View file

@ -0,0 +1,54 @@
// Package filexfer implements the wire encoding for secsh-filexfer as described in https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02
package filexfer
// PacketMarshaller narrowly defines packets that will only be transmitted.
//
// ExtendedPacket types will often only implement this interface,
// since decoding the whole packet body of an ExtendedPacket can only be done dependent on the ExtendedRequest field.
type PacketMarshaller interface {
// MarshalPacket is the primary intended way to encode a packet.
// The request-id for the packet is set from reqid.
//
// An optional buffer may be given in b.
// If the buffer has a minimum capacity, it shall be truncated and used to marshal the header into.
// The minimum capacity for the packet must be a constant expression, and should be at least 9.
//
// It shall return the main body of the encoded packet in header,
// and may optionally return an additional payload to be written immediately after the header.
//
// It shall encode in the first 4-bytes of the header the proper length of the rest of the header+payload.
MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error)
}
// Packet defines the behavior of a full generic SFTP packet.
//
// InitPacket, and VersionPacket are not generic SFTP packets, and instead implement (Un)MarshalBinary.
//
// ExtendedPacket types should not iplement this interface,
// since decoding the whole packet body of an ExtendedPacket can only be done dependent on the ExtendedRequest field.
type Packet interface {
PacketMarshaller
// Type returns the SSH_FXP_xy value associated with the specific packet.
Type() PacketType
// UnmarshalPacketBody decodes a packet body from the given Buffer.
// It is assumed that the common header values of the length, type and request-id have already been consumed.
//
// Implementations should not alias the given Buffer,
// instead they can consider prepopulating an internal buffer as a hint,
// and copying into that buffer if it has sufficient length.
UnmarshalPacketBody(buf *Buffer) error
}
// ComposePacket converts returns from MarshalPacket into an equivalent call to MarshalBinary.
func ComposePacket(header, payload []byte, err error) ([]byte, error) {
return append(header, payload...), err
}
// Default length values,
// Defined in draft-ietf-secsh-filexfer-02 section 3.
const (
DefaultMaxPacketLength = 34000
DefaultMaxDataLength = 32768
)

147
internal/encoding/ssh/filexfer/fx.go Normal file
View file

@ -0,0 +1,147 @@
package filexfer
import (
"fmt"
)
// Status defines the SFTP error codes used in SSH_FXP_STATUS response packets.
type Status uint32
// Defines the various SSH_FX_* values.
const (
// see draft-ietf-secsh-filexfer-02
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-7
StatusOK = Status(iota)
StatusEOF
StatusNoSuchFile
StatusPermissionDenied
StatusFailure
StatusBadMessage
StatusNoConnection
StatusConnectionLost
StatusOPUnsupported
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-03#section-7
StatusV4InvalidHandle
StatusV4NoSuchPath
StatusV4FileAlreadyExists
StatusV4WriteProtect
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-04#section-7
StatusV4NoMedia
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-05#section-7
StatusV5NoSpaceOnFilesystem
StatusV5QuotaExceeded
StatusV5UnknownPrincipal
StatusV5LockConflict
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-06#section-8
StatusV6DirNotEmpty
StatusV6NotADirectory
StatusV6InvalidFilename
StatusV6LinkLoop
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-07#section-8
StatusV6CannotDelete
StatusV6InvalidParameter
StatusV6FileIsADirectory
StatusV6ByteRangeLockConflict
StatusV6ByteRangeLockRefused
StatusV6DeletePending
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-08#section-8.1
StatusV6FileCorrupt
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-10#section-9.1
StatusV6OwnerInvalid
StatusV6GroupInvalid
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.1
StatusV6NoMatchingByteRangeLock
)
func (s Status) Error() string {
return s.String()
}
// Is returns true if the target is the same Status code,
// or target is a StatusPacket with the same Status code.
func (s Status) Is(target error) bool {
if target, ok := target.(*StatusPacket); ok {
return target.StatusCode == s
}
return s == target
}
func (s Status) String() string {
switch s {
case StatusOK:
return "SSH_FX_OK"
case StatusEOF:
return "SSH_FX_EOF"
case StatusNoSuchFile:
return "SSH_FX_NO_SUCH_FILE"
case StatusPermissionDenied:
return "SSH_FX_PERMISSION_DENIED"
case StatusFailure:
return "SSH_FX_FAILURE"
case StatusBadMessage:
return "SSH_FX_BAD_MESSAGE"
case StatusNoConnection:
return "SSH_FX_NO_CONNECTION"
case StatusConnectionLost:
return "SSH_FX_CONNECTION_LOST"
case StatusOPUnsupported:
return "SSH_FX_OP_UNSUPPORTED"
case StatusV4InvalidHandle:
return "SSH_FX_INVALID_HANDLE"
case StatusV4NoSuchPath:
return "SSH_FX_NO_SUCH_PATH"
case StatusV4FileAlreadyExists:
return "SSH_FX_FILE_ALREADY_EXISTS"
case StatusV4WriteProtect:
return "SSH_FX_WRITE_PROTECT"
case StatusV4NoMedia:
return "SSH_FX_NO_MEDIA"
case StatusV5NoSpaceOnFilesystem:
return "SSH_FX_NO_SPACE_ON_FILESYSTEM"
case StatusV5QuotaExceeded:
return "SSH_FX_QUOTA_EXCEEDED"
case StatusV5UnknownPrincipal:
return "SSH_FX_UNKNOWN_PRINCIPAL"
case StatusV5LockConflict:
return "SSH_FX_LOCK_CONFLICT"
case StatusV6DirNotEmpty:
return "SSH_FX_DIR_NOT_EMPTY"
case StatusV6NotADirectory:
return "SSH_FX_NOT_A_DIRECTORY"
case StatusV6InvalidFilename:
return "SSH_FX_INVALID_FILENAME"
case StatusV6LinkLoop:
return "SSH_FX_LINK_LOOP"
case StatusV6CannotDelete:
return "SSH_FX_CANNOT_DELETE"
case StatusV6InvalidParameter:
return "SSH_FX_INVALID_PARAMETER"
case StatusV6FileIsADirectory:
return "SSH_FX_FILE_IS_A_DIRECTORY"
case StatusV6ByteRangeLockConflict:
return "SSH_FX_BYTE_RANGE_LOCK_CONFLICT"
case StatusV6ByteRangeLockRefused:
return "SSH_FX_BYTE_RANGE_LOCK_REFUSED"
case StatusV6DeletePending:
return "SSH_FX_DELETE_PENDING"
case StatusV6FileCorrupt:
return "SSH_FX_FILE_CORRUPT"
case StatusV6OwnerInvalid:
return "SSH_FX_OWNER_INVALID"
case StatusV6GroupInvalid:
return "SSH_FX_GROUP_INVALID"
case StatusV6NoMatchingByteRangeLock:
return "SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK"
default:
return fmt.Sprintf("SSH_FX_UNKNOWN(%d)", s)
}
}

102
internal/encoding/ssh/filexfer/fx_test.go Normal file
View file

@ -0,0 +1,102 @@
package filexfer
import (
"bufio"
"errors"
"regexp"
"strconv"
"strings"
"testing"
)
// This string data is copied verbatim from https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13
var fxStandardsText = `
SSH_FX_OK 0
SSH_FX_EOF 1
SSH_FX_NO_SUCH_FILE 2
SSH_FX_PERMISSION_DENIED 3
SSH_FX_FAILURE 4
SSH_FX_BAD_MESSAGE 5
SSH_FX_NO_CONNECTION 6
SSH_FX_CONNECTION_LOST 7
SSH_FX_OP_UNSUPPORTED 8
SSH_FX_INVALID_HANDLE 9
SSH_FX_NO_SUCH_PATH 10
SSH_FX_FILE_ALREADY_EXISTS 11
SSH_FX_WRITE_PROTECT 12
SSH_FX_NO_MEDIA 13
SSH_FX_NO_SPACE_ON_FILESYSTEM 14
SSH_FX_QUOTA_EXCEEDED 15
SSH_FX_UNKNOWN_PRINCIPAL 16
SSH_FX_LOCK_CONFLICT 17
SSH_FX_DIR_NOT_EMPTY 18
SSH_FX_NOT_A_DIRECTORY 19
SSH_FX_INVALID_FILENAME 20
SSH_FX_LINK_LOOP 21
SSH_FX_CANNOT_DELETE 22
SSH_FX_INVALID_PARAMETER 23
SSH_FX_FILE_IS_A_DIRECTORY 24
SSH_FX_BYTE_RANGE_LOCK_CONFLICT 25
SSH_FX_BYTE_RANGE_LOCK_REFUSED 26
SSH_FX_DELETE_PENDING 27
SSH_FX_FILE_CORRUPT 28
SSH_FX_OWNER_INVALID 29
SSH_FX_GROUP_INVALID 30
SSH_FX_NO_MATCHING_BYTE_RANGE_LOCK 31
`
func TestFxNames(t *testing.T) {
whitespace := regexp.MustCompile(`[[:space:]]+`)
scan := bufio.NewScanner(strings.NewReader(fxStandardsText))
for scan.Scan() {
line := scan.Text()
if i := strings.Index(line, "//"); i >= 0 {
line = line[:i]
}
line = strings.TrimSpace(line)
if line == "" {
continue
}
fields := whitespace.Split(line, 2)
if len(fields) < 2 {
t.Fatalf("unexpected standards text line: %q", line)
}
name, value := fields[0], fields[1]
n, err := strconv.Atoi(value)
if err != nil {
t.Fatal("unexpected error:", err)
}
fx := Status(n)
if got := fx.String(); got != name {
t.Errorf("fx name mismatch for %d: got %q, but want %q", n, got, name)
}
}
if err := scan.Err(); err != nil {
t.Fatal("unexpected error:", err)
}
}
func TestStatusIs(t *testing.T) {
status := StatusFailure
if !errors.Is(status, StatusFailure) {
t.Error("errors.Is(StatusFailure, StatusFailure) != true")
}
if !errors.Is(status, &StatusPacket{StatusCode: StatusFailure}) {
t.Error("errors.Is(StatusFailure, StatusPacket{StatusFailure}) != true")
}
if errors.Is(status, StatusOK) {
t.Error("errors.Is(StatusFailure, StatusFailure) == true")
}
if errors.Is(status, &StatusPacket{StatusCode: StatusOK}) {
t.Error("errors.Is(StatusFailure, StatusPacket{StatusFailure}) == true")
}
}

124
internal/encoding/ssh/filexfer/fxp.go Normal file
View file

@ -0,0 +1,124 @@
package filexfer
import (
"fmt"
)
// PacketType defines the various SFTP packet types.
type PacketType uint8
// Request packet types.
const (
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-3
PacketTypeInit = PacketType(iota + 1)
PacketTypeVersion
PacketTypeOpen
PacketTypeClose
PacketTypeRead
PacketTypeWrite
PacketTypeLStat
PacketTypeFStat
PacketTypeSetstat
PacketTypeFSetstat
PacketTypeOpenDir
PacketTypeReadDir
PacketTypeRemove
PacketTypeMkdir
PacketTypeRmdir
PacketTypeRealPath
PacketTypeStat
PacketTypeRename
PacketTypeReadLink
PacketTypeSymlink
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-07#section-3.3
PacketTypeV6Link
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-08#section-3.3
PacketTypeV6Block
PacketTypeV6Unblock
)
// Response packet types.
const (
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-3
PacketTypeStatus = PacketType(iota + 101)
PacketTypeHandle
PacketTypeData
PacketTypeName
PacketTypeAttrs
)
// Extended packet types.
const (
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-3
PacketTypeExtended = PacketType(iota + 200)
PacketTypeExtendedReply
)
func (f PacketType) String() string {
switch f {
case PacketTypeInit:
return "SSH_FXP_INIT"
case PacketTypeVersion:
return "SSH_FXP_VERSION"
case PacketTypeOpen:
return "SSH_FXP_OPEN"
case PacketTypeClose:
return "SSH_FXP_CLOSE"
case PacketTypeRead:
return "SSH_FXP_READ"
case PacketTypeWrite:
return "SSH_FXP_WRITE"
case PacketTypeLStat:
return "SSH_FXP_LSTAT"
case PacketTypeFStat:
return "SSH_FXP_FSTAT"
case PacketTypeSetstat:
return "SSH_FXP_SETSTAT"
case PacketTypeFSetstat:
return "SSH_FXP_FSETSTAT"
case PacketTypeOpenDir:
return "SSH_FXP_OPENDIR"
case PacketTypeReadDir:
return "SSH_FXP_READDIR"
case PacketTypeRemove:
return "SSH_FXP_REMOVE"
case PacketTypeMkdir:
return "SSH_FXP_MKDIR"
case PacketTypeRmdir:
return "SSH_FXP_RMDIR"
case PacketTypeRealPath:
return "SSH_FXP_REALPATH"
case PacketTypeStat:
return "SSH_FXP_STAT"
case PacketTypeRename:
return "SSH_FXP_RENAME"
case PacketTypeReadLink:
return "SSH_FXP_READLINK"
case PacketTypeSymlink:
return "SSH_FXP_SYMLINK"
case PacketTypeV6Link:
return "SSH_FXP_LINK"
case PacketTypeV6Block:
return "SSH_FXP_BLOCK"
case PacketTypeV6Unblock:
return "SSH_FXP_UNBLOCK"
case PacketTypeStatus:
return "SSH_FXP_STATUS"
case PacketTypeHandle:
return "SSH_FXP_HANDLE"
case PacketTypeData:
return "SSH_FXP_DATA"
case PacketTypeName:
return "SSH_FXP_NAME"
case PacketTypeAttrs:
return "SSH_FXP_ATTRS"
case PacketTypeExtended:
return "SSH_FXP_EXTENDED"
case PacketTypeExtendedReply:
return "SSH_FXP_EXTENDED_REPLY"
default:
return fmt.Sprintf("SSH_FXP_UNKNOWN(%d)", f)
}
}

84
internal/encoding/ssh/filexfer/fxp_test.go Normal file
View file

@ -0,0 +1,84 @@
package filexfer
import (
"bufio"
"regexp"
"strconv"
"strings"
"testing"
)
// This string data is copied verbatim from https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13
var fxpStandardsText = `
SSH_FXP_INIT 1
SSH_FXP_VERSION 2
SSH_FXP_OPEN 3
SSH_FXP_CLOSE 4
SSH_FXP_READ 5
SSH_FXP_WRITE 6
SSH_FXP_LSTAT 7
SSH_FXP_FSTAT 8
SSH_FXP_SETSTAT 9
SSH_FXP_FSETSTAT 10
SSH_FXP_OPENDIR 11
SSH_FXP_READDIR 12
SSH_FXP_REMOVE 13
SSH_FXP_MKDIR 14
SSH_FXP_RMDIR 15
SSH_FXP_REALPATH 16
SSH_FXP_STAT 17
SSH_FXP_RENAME 18
SSH_FXP_READLINK 19
SSH_FXP_SYMLINK 20 // Deprecated in filexfer-13 added from filexfer-02
SSH_FXP_LINK 21
SSH_FXP_BLOCK 22
SSH_FXP_UNBLOCK 23
SSH_FXP_STATUS 101
SSH_FXP_HANDLE 102
SSH_FXP_DATA 103
SSH_FXP_NAME 104
SSH_FXP_ATTRS 105
SSH_FXP_EXTENDED 200
SSH_FXP_EXTENDED_REPLY 201
`
func TestFxpNames(t *testing.T) {
whitespace := regexp.MustCompile(`[[:space:]]+`)
scan := bufio.NewScanner(strings.NewReader(fxpStandardsText))
for scan.Scan() {
line := scan.Text()
if i := strings.Index(line, "//"); i >= 0 {
line = line[:i]
}
line = strings.TrimSpace(line)
if line == "" {
continue
}
fields := whitespace.Split(line, 2)
if len(fields) < 2 {
t.Fatalf("unexpected standards text line: %q", line)
}
name, value := fields[0], fields[1]
n, err := strconv.Atoi(value)
if err != nil {
t.Fatal("unexpected error:", err)
}
fxp := PacketType(n)
if got := fxp.String(); got != name {
t.Errorf("fxp name mismatch for %d: got %q, but want %q", n, got, name)
}
}
if err := scan.Err(); err != nil {
t.Fatal("unexpected error:", err)
}
}

249
internal/encoding/ssh/filexfer/handle_packets.go Normal file
View file

@ -0,0 +1,249 @@
package filexfer
// ClosePacket defines the SSH_FXP_CLOSE packet.
type ClosePacket struct {
Handle string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *ClosePacket) Type() PacketType {
return PacketTypeClose
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *ClosePacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Handle) // string(handle)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeClose, reqid)
buf.AppendString(p.Handle)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *ClosePacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Handle, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// ReadPacket defines the SSH_FXP_READ packet.
type ReadPacket struct {
Handle string
Offset uint64
Len uint32
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *ReadPacket) Type() PacketType {
return PacketTypeRead
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *ReadPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
// string(handle) + uint64(offset) + uint32(len)
size := 4 + len(p.Handle) + 8 + 4
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeRead, reqid)
buf.AppendString(p.Handle)
buf.AppendUint64(p.Offset)
buf.AppendUint32(p.Len)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *ReadPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Handle, err = buf.ConsumeString(); err != nil {
return err
}
if p.Offset, err = buf.ConsumeUint64(); err != nil {
return err
}
if p.Len, err = buf.ConsumeUint32(); err != nil {
return err
}
return nil
}
// WritePacket defines the SSH_FXP_WRITE packet.
type WritePacket struct {
Handle string
Offset uint64
Data []byte
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *WritePacket) Type() PacketType {
return PacketTypeWrite
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *WritePacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
// string(handle) + uint64(offset) + uint32(len(data)); data content in payload
size := 4 + len(p.Handle) + 8 + 4
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeWrite, reqid)
buf.AppendString(p.Handle)
buf.AppendUint64(p.Offset)
buf.AppendUint32(uint32(len(p.Data)))
return buf.Packet(p.Data)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
//
// If p.Data is already populated, and of sufficient length to hold the data,
// then this will copy the data into that byte slice.
//
// If p.Data has a length insufficient to hold the data,
// then this will make a new slice of sufficient length, and copy the data into that.
//
// This means this _does not_ alias any of the data buffer that is passed in.
func (p *WritePacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Handle, err = buf.ConsumeString(); err != nil {
return err
}
if p.Offset, err = buf.ConsumeUint64(); err != nil {
return err
}
data, err := buf.ConsumeByteSlice()
if err != nil {
return err
}
if len(p.Data) < len(data) {
p.Data = make([]byte, len(data))
}
n := copy(p.Data, data)
p.Data = p.Data[:n]
return nil
}
// FStatPacket defines the SSH_FXP_FSTAT packet.
type FStatPacket struct {
Handle string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *FStatPacket) Type() PacketType {
return PacketTypeFStat
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *FStatPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Handle) // string(handle)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeFStat, reqid)
buf.AppendString(p.Handle)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *FStatPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Handle, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// FSetstatPacket defines the SSH_FXP_FSETSTAT packet.
type FSetstatPacket struct {
Handle string
Attrs Attributes
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *FSetstatPacket) Type() PacketType {
return PacketTypeFSetstat
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *FSetstatPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Handle) + p.Attrs.Len() // string(handle) + ATTRS(attrs)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeFSetstat, reqid)
buf.AppendString(p.Handle)
p.Attrs.MarshalInto(buf)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *FSetstatPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Handle, err = buf.ConsumeString(); err != nil {
return err
}
return p.Attrs.UnmarshalFrom(buf)
}
// ReadDirPacket defines the SSH_FXP_READDIR packet.
type ReadDirPacket struct {
Handle string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *ReadDirPacket) Type() PacketType {
return PacketTypeReadDir
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *ReadDirPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Handle) // string(handle)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeReadDir, reqid)
buf.AppendString(p.Handle)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *ReadDirPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Handle, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}

282
internal/encoding/ssh/filexfer/handle_packets_test.go Normal file
View file

@ -0,0 +1,282 @@
package filexfer
import (
"bytes"
"testing"
)
var _ Packet = &ClosePacket{}
func TestClosePacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
)
p := &ClosePacket{
Handle: "somehandle",
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 19,
4,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ClosePacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Handle != handle {
t.Errorf("UnmarshalPacketBody(): Handle was %q, but expected %q", p.Handle, handle)
}
}
var _ Packet = &ReadPacket{}
func TestReadPacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
offset = 0x123456789ABCDEF0
length = 0xFEDCBA98
)
p := &ReadPacket{
Handle: "somehandle",
Offset: offset,
Len: length,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 31,
5,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0,
0xFE, 0xDC, 0xBA, 0x98,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ReadPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Handle != handle {
t.Errorf("UnmarshalPacketBody(): Handle was %q, but expected %q", p.Handle, handle)
}
if p.Offset != offset {
t.Errorf("UnmarshalPacketBody(): Offset was %x, but expected %x", p.Offset, offset)
}
if p.Len != length {
t.Errorf("UnmarshalPacketBody(): Len was %x, but expected %x", p.Len, length)
}
}
var _ Packet = &WritePacket{}
func TestWritePacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
offset = 0x123456789ABCDEF0
)
var payload = []byte(`foobar`)
p := &WritePacket{
Handle: "somehandle",
Offset: offset,
Data: payload,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 37,
6,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0,
0x00, 0x00, 0x00, 0x06, 'f', 'o', 'o', 'b', 'a', 'r',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = WritePacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Handle != handle {
t.Errorf("UnmarshalPacketBody(): Handle was %q, but expected %q", p.Handle, handle)
}
if p.Offset != offset {
t.Errorf("UnmarshalPacketBody(): Offset was %x, but expected %x", p.Offset, offset)
}
if !bytes.Equal(p.Data, payload) {
t.Errorf("UnmarshalPacketBody(): Data was %X, but expected %X", p.Data, payload)
}
}
var _ Packet = &FStatPacket{}
func TestFStatPacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
)
p := &FStatPacket{
Handle: "somehandle",
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 19,
8,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = FStatPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Handle != handle {
t.Errorf("UnmarshalPacketBody(): Handle was %q, but expected %q", p.Handle, handle)
}
}
var _ Packet = &FSetstatPacket{}
func TestFSetstatPacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
perms = 0x87654321
)
p := &FSetstatPacket{
Handle: "somehandle",
Attrs: Attributes{
Flags: AttrPermissions,
Permissions: perms,
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 27,
10,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
0x00, 0x00, 0x00, 0x04,
0x87, 0x65, 0x43, 0x21,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = FSetstatPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Handle != handle {
t.Errorf("UnmarshalPacketBody(): Handle was %q, but expected %q", p.Handle, handle)
}
}
var _ Packet = &ReadDirPacket{}
func TestReadDirPacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
)
p := &ReadDirPacket{
Handle: "somehandle",
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 19,
12,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ReadDirPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Handle != handle {
t.Errorf("UnmarshalPacketBody(): Handle was %q, but expected %q", p.Handle, handle)
}
}

99
internal/encoding/ssh/filexfer/init_packets.go Normal file
View file

@ -0,0 +1,99 @@
package filexfer
// InitPacket defines the SSH_FXP_INIT packet.
type InitPacket struct {
Version uint32
Extensions []*ExtensionPair
}
// MarshalBinary returns p as the binary encoding of p.
func (p *InitPacket) MarshalBinary() ([]byte, error) {
size := 1 + 4 // byte(type) + uint32(version)
for _, ext := range p.Extensions {
size += ext.Len()
}
b := NewBuffer(make([]byte, 4, 4+size))
b.AppendUint8(uint8(PacketTypeInit))
b.AppendUint32(p.Version)
for _, ext := range p.Extensions {
ext.MarshalInto(b)
}
b.PutLength(size)
return b.Bytes(), nil
}
// UnmarshalBinary unmarshals a full raw packet out of the given data.
// It is assumed that the uint32(length) has already been consumed to receive the data.
// It is also assumed that the uint8(type) has already been consumed to which packet to unmarshal into.
func (p *InitPacket) UnmarshalBinary(data []byte) (err error) {
buf := NewBuffer(data)
if p.Version, err = buf.ConsumeUint32(); err != nil {
return err
}
for buf.Len() > 0 {
var ext ExtensionPair
if err := ext.UnmarshalFrom(buf); err != nil {
return err
}
p.Extensions = append(p.Extensions, &ext)
}
return nil
}
// VersionPacket defines the SSH_FXP_VERSION packet.
type VersionPacket struct {
Version uint32
Extensions []*ExtensionPair
}
// MarshalBinary returns p as the binary encoding of p.
func (p *VersionPacket) MarshalBinary() ([]byte, error) {
size := 1 + 4 // byte(type) + uint32(version)
for _, ext := range p.Extensions {
size += ext.Len()
}
b := NewBuffer(make([]byte, 4, 4+size))
b.AppendUint8(uint8(PacketTypeVersion))
b.AppendUint32(p.Version)
for _, ext := range p.Extensions {
ext.MarshalInto(b)
}
b.PutLength(size)
return b.Bytes(), nil
}
// UnmarshalBinary unmarshals a full raw packet out of the given data.
// It is assumed that the uint32(length) has already been consumed to receive the data.
// It is also assumed that the uint8(type) has already been consumed to which packet to unmarshal into.
func (p *VersionPacket) UnmarshalBinary(data []byte) (err error) {
buf := NewBuffer(data)
if p.Version, err = buf.ConsumeUint32(); err != nil {
return err
}
for buf.Len() > 0 {
var ext ExtensionPair
if err := ext.UnmarshalFrom(buf); err != nil {
return err
}
p.Extensions = append(p.Extensions, &ext)
}
return nil
}

114
internal/encoding/ssh/filexfer/init_packets_test.go Normal file
View file

@ -0,0 +1,114 @@
package filexfer
import (
"bytes"
"testing"
)
func TestInitPacket(t *testing.T) {
var version uint8 = 3
p := &InitPacket{
Version: uint32(version),
Extensions: []*ExtensionPair{
{
Name: "foo",
Data: "1",
},
},
}
buf, err := p.MarshalBinary()
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 17,
1,
0x00, 0x00, 0x00, version,
0x00, 0x00, 0x00, 3, 'f', 'o', 'o',
0x00, 0x00, 0x00, 1, '1',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalBinary() = %X, but wanted %X", buf, want)
}
*p = InitPacket{}
// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
if err := p.UnmarshalBinary(buf[5:]); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Version != uint32(version) {
t.Errorf("UnmarshalBinary(): Version was %d, but expected %d", p.Version, version)
}
if len(p.Extensions) != 1 {
t.Fatalf("UnmarshalBinary(): len(p.Extensions) was %d, but expected %d", len(p.Extensions), 1)
}
if got, want := p.Extensions[0].Name, "foo"; got != want {
t.Errorf("UnmarshalBinary(): p.Extensions[0].Name was %q, but expected %q", got, want)
}
if got, want := p.Extensions[0].Data, "1"; got != want {
t.Errorf("UnmarshalBinary(): p.Extensions[0].Data was %q, but expected %q", got, want)
}
}
func TestVersionPacket(t *testing.T) {
var version uint8 = 3
p := &VersionPacket{
Version: uint32(version),
Extensions: []*ExtensionPair{
{
Name: "foo",
Data: "1",
},
},
}
buf, err := p.MarshalBinary()
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 17,
2,
0x00, 0x00, 0x00, version,
0x00, 0x00, 0x00, 3, 'f', 'o', 'o',
0x00, 0x00, 0x00, 1, '1',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalBinary() = %X, but wanted %X", buf, want)
}
*p = VersionPacket{}
// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
if err := p.UnmarshalBinary(buf[5:]); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Version != uint32(version) {
t.Errorf("UnmarshalBinary(): Version was %d, but expected %d", p.Version, version)
}
if len(p.Extensions) != 1 {
t.Fatalf("UnmarshalBinary(): len(p.Extensions) was %d, but expected %d", len(p.Extensions), 1)
}
if got, want := p.Extensions[0].Name, "foo"; got != want {
t.Errorf("UnmarshalBinary(): p.Extensions[0].Name was %q, but expected %q", got, want)
}
if got, want := p.Extensions[0].Data, "1"; got != want {
t.Errorf("UnmarshalBinary(): p.Extensions[0].Data was %q, but expected %q", got, want)
}
}

89
internal/encoding/ssh/filexfer/open_packets.go Normal file
View file

@ -0,0 +1,89 @@
package filexfer
// SSH_FXF_* flags.
const (
FlagRead = 1 << iota // SSH_FXF_READ
FlagWrite // SSH_FXF_WRITE
FlagAppend // SSH_FXF_APPEND
FlagCreate // SSH_FXF_CREAT
FlagTruncate // SSH_FXF_TRUNC
FlagExclusive // SSH_FXF_EXCL
)
// OpenPacket defines the SSH_FXP_OPEN packet.
type OpenPacket struct {
Filename string
PFlags uint32
Attrs Attributes
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *OpenPacket) Type() PacketType {
return PacketTypeOpen
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *OpenPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
// string(filename) + uint32(pflags) + ATTRS(attrs)
size := 4 + len(p.Filename) + 4 + p.Attrs.Len()
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeOpen, reqid)
buf.AppendString(p.Filename)
buf.AppendUint32(p.PFlags)
p.Attrs.MarshalInto(buf)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *OpenPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Filename, err = buf.ConsumeString(); err != nil {
return err
}
if p.PFlags, err = buf.ConsumeUint32(); err != nil {
return err
}
return p.Attrs.UnmarshalFrom(buf)
}
// OpenDirPacket defines the SSH_FXP_OPENDIR packet.
type OpenDirPacket struct {
Path string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *OpenDirPacket) Type() PacketType {
return PacketTypeOpenDir
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *OpenDirPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) // string(path)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeOpenDir, reqid)
buf.AppendString(p.Path)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *OpenDirPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}

107
internal/encoding/ssh/filexfer/open_packets_test.go Normal file
View file

@ -0,0 +1,107 @@
package filexfer
import (
"bytes"
"testing"
)
var _ Packet = &OpenPacket{}
func TestOpenPacket(t *testing.T) {
const (
id = 42
filename = "/foo"
perms = 0x87654321
)
p := &OpenPacket{
Filename: "/foo",
PFlags: FlagRead,
Attrs: Attributes{
Flags: AttrPermissions,
Permissions: perms,
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 25,
3,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
0x00, 0x00, 0x00, 1,
0x00, 0x00, 0x00, 0x04,
0x87, 0x65, 0x43, 0x21,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = OpenPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Filename != filename {
t.Errorf("UnmarshalPacketBody(): Filename was %q, but expected %q", p.Filename, filename)
}
if p.PFlags != FlagRead {
t.Errorf("UnmarshalPacketBody(): PFlags was %#x, but expected %#x", p.PFlags, FlagRead)
}
if p.Attrs.Flags != AttrPermissions {
t.Errorf("UnmarshalPacketBody(): Attrs.Flags was %#x, but expected %#x", p.Attrs.Flags, AttrPermissions)
}
if p.Attrs.Permissions != perms {
t.Errorf("UnmarshalPacketBody(): Attrs.Permissions was %#v, but expected %#v", p.Attrs.Permissions, perms)
}
}
var _ Packet = &OpenDirPacket{}
func TestOpenDirPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
p := &OpenDirPacket{
Path: path,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
11,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = OpenDirPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
}

73
internal/encoding/ssh/filexfer/openssh/fsync.go Normal file
View file

@ -0,0 +1,73 @@
package openssh
import (
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
const extensionFSync = "fsync@openssh.com"
// RegisterExtensionFSync registers the "fsync@openssh.com" extended packet with the encoding/ssh/filexfer package.
func RegisterExtensionFSync() {
sshfx.RegisterExtendedPacketType(extensionFSync, func() sshfx.ExtendedData {
return new(FSyncExtendedPacket)
})
}
// ExtensionFSync returns an ExtensionPair suitable to append into an sshfx.InitPacket or sshfx.VersionPacket.
func ExtensionFSync() *sshfx.ExtensionPair {
return &sshfx.ExtensionPair{
Name: extensionFSync,
Data: "1",
}
}
// FSyncExtendedPacket defines the fsync@openssh.com extend packet.
type FSyncExtendedPacket struct {
Handle string
}
// Type returns the SSH_FXP_EXTENDED packet type.
func (ep *FSyncExtendedPacket) Type() sshfx.PacketType {
return sshfx.PacketTypeExtended
}
// MarshalPacket returns ep as a two-part binary encoding of the full extended packet.
func (ep *FSyncExtendedPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
p := &sshfx.ExtendedPacket{
ExtendedRequest: extensionFSync,
Data: ep,
}
return p.MarshalPacket(reqid, b)
}
// MarshalInto encodes ep into the binary encoding of the fsync@openssh.com extended packet-specific data.
func (ep *FSyncExtendedPacket) MarshalInto(buf *sshfx.Buffer) {
buf.AppendString(ep.Handle)
}
// MarshalBinary encodes ep into the binary encoding of the fsync@openssh.com extended packet-specific data.
//
// NOTE: This _only_ encodes the packet-specific data, it does not encode the full extended packet.
func (ep *FSyncExtendedPacket) MarshalBinary() ([]byte, error) {
// string(handle)
size := 4 + len(ep.Handle)
buf := sshfx.NewBuffer(make([]byte, 0, size))
ep.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom decodes the fsync@openssh.com extended packet-specific data from buf.
func (ep *FSyncExtendedPacket) UnmarshalFrom(buf *sshfx.Buffer) (err error) {
if ep.Handle, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the fsync@openssh.com extended packet-specific data into ep.
func (ep *FSyncExtendedPacket) UnmarshalBinary(data []byte) (err error) {
return ep.UnmarshalFrom(sshfx.NewBuffer(data))
}

62
internal/encoding/ssh/filexfer/openssh/fsync_test.go Normal file
View file

@ -0,0 +1,62 @@
package openssh
import (
"bytes"
"testing"
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
var _ sshfx.PacketMarshaller = &FSyncExtendedPacket{}
func init() {
RegisterExtensionFSync()
}
func TestFSyncExtendedPacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
)
ep := &FSyncExtendedPacket{
Handle: handle,
}
data, err := sshfx.ComposePacket(ep.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 40,
200,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 17, 'f', 's', 'y', 'n', 'c', '@', 'o', 'p', 'e', 'n', 's', 's', 'h', '.', 'c', 'o', 'm',
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
}
if !bytes.Equal(data, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", data, want)
}
var p sshfx.ExtendedPacket
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(sshfx.NewBuffer(data[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extensionFSync {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extensionFSync)
}
ep, ok := p.Data.(*FSyncExtendedPacket)
if !ok {
t.Fatalf("UnmarshaledPacketBody(): Data was type %T, but expected *FSyncExtendedPacket", p.Data)
}
if ep.Handle != handle {
t.Errorf("UnmarshalPacketBody(): Handle was %q, but expected %q", ep.Handle, handle)
}
}

79
internal/encoding/ssh/filexfer/openssh/hardlink.go Normal file
View file

@ -0,0 +1,79 @@
package openssh
import (
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
const extensionHardlink = "hardlink@openssh.com"
// RegisterExtensionHardlink registers the "hardlink@openssh.com" extended packet with the encoding/ssh/filexfer package.
func RegisterExtensionHardlink() {
sshfx.RegisterExtendedPacketType(extensionHardlink, func() sshfx.ExtendedData {
return new(HardlinkExtendedPacket)
})
}
// ExtensionHardlink returns an ExtensionPair suitable to append into an sshfx.InitPacket or sshfx.VersionPacket.
func ExtensionHardlink() *sshfx.ExtensionPair {
return &sshfx.ExtensionPair{
Name: extensionHardlink,
Data: "1",
}
}
// HardlinkExtendedPacket defines the hardlink@openssh.com extend packet.
type HardlinkExtendedPacket struct {
OldPath string
NewPath string
}
// Type returns the SSH_FXP_EXTENDED packet type.
func (ep *HardlinkExtendedPacket) Type() sshfx.PacketType {
return sshfx.PacketTypeExtended
}
// MarshalPacket returns ep as a two-part binary encoding of the full extended packet.
func (ep *HardlinkExtendedPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
p := &sshfx.ExtendedPacket{
ExtendedRequest: extensionHardlink,
Data: ep,
}
return p.MarshalPacket(reqid, b)
}
// MarshalInto encodes ep into the binary encoding of the hardlink@openssh.com extended packet-specific data.
func (ep *HardlinkExtendedPacket) MarshalInto(buf *sshfx.Buffer) {
buf.AppendString(ep.OldPath)
buf.AppendString(ep.NewPath)
}
// MarshalBinary encodes ep into the binary encoding of the hardlink@openssh.com extended packet-specific data.
//
// NOTE: This _only_ encodes the packet-specific data, it does not encode the full extended packet.
func (ep *HardlinkExtendedPacket) MarshalBinary() ([]byte, error) {
// string(oldpath) + string(newpath)
size := 4 + len(ep.OldPath) + 4 + len(ep.NewPath)
buf := sshfx.NewBuffer(make([]byte, 0, size))
ep.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom decodes the hardlink@openssh.com extended packet-specific data from buf.
func (ep *HardlinkExtendedPacket) UnmarshalFrom(buf *sshfx.Buffer) (err error) {
if ep.OldPath, err = buf.ConsumeString(); err != nil {
return err
}
if ep.NewPath, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the hardlink@openssh.com extended packet-specific data into ep.
func (ep *HardlinkExtendedPacket) UnmarshalBinary(data []byte) (err error) {
return ep.UnmarshalFrom(sshfx.NewBuffer(data))
}

69
internal/encoding/ssh/filexfer/openssh/hardlink_test.go Normal file
View file

@ -0,0 +1,69 @@
package openssh
import (
"bytes"
"testing"
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
var _ sshfx.PacketMarshaller = &HardlinkExtendedPacket{}
func init() {
RegisterExtensionHardlink()
}
func TestHardlinkExtendedPacket(t *testing.T) {
const (
id = 42
oldpath = "/foo"
newpath = "/bar"
)
ep := &HardlinkExtendedPacket{
OldPath: oldpath,
NewPath: newpath,
}
data, err := sshfx.ComposePacket(ep.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 45,
200,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 20, 'h', 'a', 'r', 'd', 'l', 'i', 'n', 'k', '@', 'o', 'p', 'e', 'n', 's', 's', 'h', '.', 'c', 'o', 'm',
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
0x00, 0x00, 0x00, 4, '/', 'b', 'a', 'r',
}
if !bytes.Equal(data, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", data, want)
}
var p sshfx.ExtendedPacket
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(sshfx.NewBuffer(data[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extensionHardlink {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extensionHardlink)
}
ep, ok := p.Data.(*HardlinkExtendedPacket)
if !ok {
t.Fatalf("UnmarshaledPacketBody(): Data was type %T, but expected *HardlinkExtendedPacket", p.Data)
}
if ep.OldPath != oldpath {
t.Errorf("UnmarshalPacketBody(): OldPath was %q, but expected %q", ep.OldPath, oldpath)
}
if ep.NewPath != newpath {
t.Errorf("UnmarshalPacketBody(): NewPath was %q, but expected %q", ep.NewPath, newpath)
}
}

2
internal/encoding/ssh/filexfer/openssh/openssh.go Normal file
View file

@ -0,0 +1,2 @@
// Package openssh implements the openssh secsh-filexfer extensions as described in https://github.com/openssh/openssh-portable/blob/master/PROTOCOL
package openssh

79
internal/encoding/ssh/filexfer/openssh/posix-rename.go Normal file
View file

@ -0,0 +1,79 @@
package openssh
import (
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
const extensionPosixRename = "posix-rename@openssh.com"
// RegisterExtensionPosixRename registers the "posix-rename@openssh.com" extended packet with the encoding/ssh/filexfer package.
func RegisterExtensionPosixRename() {
sshfx.RegisterExtendedPacketType(extensionPosixRename, func() sshfx.ExtendedData {
return new(PosixRenameExtendedPacket)
})
}
// ExtensionPosixRename returns an ExtensionPair suitable to append into an sshfx.InitPacket or sshfx.VersionPacket.
func ExtensionPosixRename() *sshfx.ExtensionPair {
return &sshfx.ExtensionPair{
Name: extensionPosixRename,
Data: "1",
}
}
// PosixRenameExtendedPacket defines the posix-rename@openssh.com extend packet.
type PosixRenameExtendedPacket struct {
OldPath string
NewPath string
}
// Type returns the SSH_FXP_EXTENDED packet type.
func (ep *PosixRenameExtendedPacket) Type() sshfx.PacketType {
return sshfx.PacketTypeExtended
}
// MarshalPacket returns ep as a two-part binary encoding of the full extended packet.
func (ep *PosixRenameExtendedPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
p := &sshfx.ExtendedPacket{
ExtendedRequest: extensionPosixRename,
Data: ep,
}
return p.MarshalPacket(reqid, b)
}
// MarshalInto encodes ep into the binary encoding of the hardlink@openssh.com extended packet-specific data.
func (ep *PosixRenameExtendedPacket) MarshalInto(buf *sshfx.Buffer) {
buf.AppendString(ep.OldPath)
buf.AppendString(ep.NewPath)
}
// MarshalBinary encodes ep into the binary encoding of the hardlink@openssh.com extended packet-specific data.
//
// NOTE: This _only_ encodes the packet-specific data, it does not encode the full extended packet.
func (ep *PosixRenameExtendedPacket) MarshalBinary() ([]byte, error) {
// string(oldpath) + string(newpath)
size := 4 + len(ep.OldPath) + 4 + len(ep.NewPath)
buf := sshfx.NewBuffer(make([]byte, 0, size))
ep.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom decodes the hardlink@openssh.com extended packet-specific data from buf.
func (ep *PosixRenameExtendedPacket) UnmarshalFrom(buf *sshfx.Buffer) (err error) {
if ep.OldPath, err = buf.ConsumeString(); err != nil {
return err
}
if ep.NewPath, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the hardlink@openssh.com extended packet-specific data into ep.
func (ep *PosixRenameExtendedPacket) UnmarshalBinary(data []byte) (err error) {
return ep.UnmarshalFrom(sshfx.NewBuffer(data))
}

69
internal/encoding/ssh/filexfer/openssh/posix-rename_test.go Normal file
View file

@ -0,0 +1,69 @@
package openssh
import (
"bytes"
"testing"
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
var _ sshfx.PacketMarshaller = &PosixRenameExtendedPacket{}
func init() {
RegisterExtensionPosixRename()
}
func TestPosixRenameExtendedPacket(t *testing.T) {
const (
id = 42
oldpath = "/foo"
newpath = "/bar"
)
ep := &PosixRenameExtendedPacket{
OldPath: oldpath,
NewPath: newpath,
}
data, err := sshfx.ComposePacket(ep.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 49,
200,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 24, 'p', 'o', 's', 'i', 'x', '-', 'r', 'e', 'n', 'a', 'm', 'e', '@', 'o', 'p', 'e', 'n', 's', 's', 'h', '.', 'c', 'o', 'm',
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
0x00, 0x00, 0x00, 4, '/', 'b', 'a', 'r',
}
if !bytes.Equal(data, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", data, want)
}
var p sshfx.ExtendedPacket
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(sshfx.NewBuffer(data[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extensionPosixRename {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extensionPosixRename)
}
ep, ok := p.Data.(*PosixRenameExtendedPacket)
if !ok {
t.Fatalf("UnmarshaledPacketBody(): Data was type %T, but expected *PosixRenameExtendedPacket", p.Data)
}
if ep.OldPath != oldpath {
t.Errorf("UnmarshalPacketBody(): OldPath was %q, but expected %q", ep.OldPath, oldpath)
}
if ep.NewPath != newpath {
t.Errorf("UnmarshalPacketBody(): NewPath was %q, but expected %q", ep.NewPath, newpath)
}
}

256
internal/encoding/ssh/filexfer/openssh/statvfs.go Normal file
View file

@ -0,0 +1,256 @@
package openssh
import (
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
const extensionStatVFS = "statvfs@openssh.com"
// RegisterExtensionStatVFS registers the "statvfs@openssh.com" extended packet with the encoding/ssh/filexfer package.
func RegisterExtensionStatVFS() {
sshfx.RegisterExtendedPacketType(extensionStatVFS, func() sshfx.ExtendedData {
return new(StatVFSExtendedPacket)
})
}
// ExtensionStatVFS returns an ExtensionPair suitable to append into an sshfx.InitPacket or sshfx.VersionPacket.
func ExtensionStatVFS() *sshfx.ExtensionPair {
return &sshfx.ExtensionPair{
Name: extensionStatVFS,
Data: "2",
}
}
// StatVFSExtendedPacket defines the statvfs@openssh.com extend packet.
type StatVFSExtendedPacket struct {
Path string
}
// Type returns the SSH_FXP_EXTENDED packet type.
func (ep *StatVFSExtendedPacket) Type() sshfx.PacketType {
return sshfx.PacketTypeExtended
}
// MarshalPacket returns ep as a two-part binary encoding of the full extended packet.
func (ep *StatVFSExtendedPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
p := &sshfx.ExtendedPacket{
ExtendedRequest: extensionStatVFS,
Data: ep,
}
return p.MarshalPacket(reqid, b)
}
// MarshalInto encodes ep into the binary encoding of the statvfs@openssh.com extended packet-specific data.
func (ep *StatVFSExtendedPacket) MarshalInto(buf *sshfx.Buffer) {
buf.AppendString(ep.Path)
}
// MarshalBinary encodes ep into the binary encoding of the statvfs@openssh.com extended packet-specific data.
//
// NOTE: This _only_ encodes the packet-specific data, it does not encode the full extended packet.
func (ep *StatVFSExtendedPacket) MarshalBinary() ([]byte, error) {
size := 4 + len(ep.Path) // string(path)
buf := sshfx.NewBuffer(make([]byte, 0, size))
ep.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom decodes the statvfs@openssh.com extended packet-specific data into ep.
func (ep *StatVFSExtendedPacket) UnmarshalFrom(buf *sshfx.Buffer) (err error) {
if ep.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the statvfs@openssh.com extended packet-specific data into ep.
func (ep *StatVFSExtendedPacket) UnmarshalBinary(data []byte) (err error) {
return ep.UnmarshalFrom(sshfx.NewBuffer(data))
}
const extensionFStatVFS = "fstatvfs@openssh.com"
// RegisterExtensionFStatVFS registers the "fstatvfs@openssh.com" extended packet with the encoding/ssh/filexfer package.
func RegisterExtensionFStatVFS() {
sshfx.RegisterExtendedPacketType(extensionFStatVFS, func() sshfx.ExtendedData {
return new(FStatVFSExtendedPacket)
})
}
// ExtensionFStatVFS returns an ExtensionPair suitable to append into an sshfx.InitPacket or sshfx.VersionPacket.
func ExtensionFStatVFS() *sshfx.ExtensionPair {
return &sshfx.ExtensionPair{
Name: extensionFStatVFS,
Data: "2",
}
}
// FStatVFSExtendedPacket defines the fstatvfs@openssh.com extend packet.
type FStatVFSExtendedPacket struct {
Path string
}
// Type returns the SSH_FXP_EXTENDED packet type.
func (ep *FStatVFSExtendedPacket) Type() sshfx.PacketType {
return sshfx.PacketTypeExtended
}
// MarshalPacket returns ep as a two-part binary encoding of the full extended packet.
func (ep *FStatVFSExtendedPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
p := &sshfx.ExtendedPacket{
ExtendedRequest: extensionFStatVFS,
Data: ep,
}
return p.MarshalPacket(reqid, b)
}
// MarshalInto encodes ep into the binary encoding of the statvfs@openssh.com extended packet-specific data.
func (ep *FStatVFSExtendedPacket) MarshalInto(buf *sshfx.Buffer) {
buf.AppendString(ep.Path)
}
// MarshalBinary encodes ep into the binary encoding of the statvfs@openssh.com extended packet-specific data.
//
// NOTE: This _only_ encodes the packet-specific data, it does not encode the full extended packet.
func (ep *FStatVFSExtendedPacket) MarshalBinary() ([]byte, error) {
size := 4 + len(ep.Path) // string(path)
buf := sshfx.NewBuffer(make([]byte, 0, size))
ep.MarshalInto(buf)
return buf.Bytes(), nil
}
// UnmarshalFrom decodes the statvfs@openssh.com extended packet-specific data into ep.
func (ep *FStatVFSExtendedPacket) UnmarshalFrom(buf *sshfx.Buffer) (err error) {
if ep.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the statvfs@openssh.com extended packet-specific data into ep.
func (ep *FStatVFSExtendedPacket) UnmarshalBinary(data []byte) (err error) {
return ep.UnmarshalFrom(sshfx.NewBuffer(data))
}
// The values for the MountFlags field.
// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL
const (
MountFlagsReadOnly = 0x1 // SSH_FXE_STATVFS_ST_RDONLY
MountFlagsNoSUID = 0x2 // SSH_FXE_STATVFS_ST_NOSUID
)
// StatVFSExtendedReplyPacket defines the extended reply packet for statvfs@openssh.com and fstatvfs@openssh.com requests.
type StatVFSExtendedReplyPacket struct {
BlockSize uint64 /* f_bsize: file system block size */
FragmentSize uint64 /* f_frsize: fundamental fs block size / fagment size */
Blocks uint64 /* f_blocks: number of blocks (unit f_frsize) */
BlocksFree uint64 /* f_bfree: free blocks in filesystem */
BlocksAvail uint64 /* f_bavail: free blocks for non-root */
Files uint64 /* f_files: total file inodes */
FilesFree uint64 /* f_ffree: free file inodes */
FilesAvail uint64 /* f_favail: free file inodes for to non-root */
FilesystemID uint64 /* f_fsid: file system id */
MountFlags uint64 /* f_flag: bit mask of mount flag values */
MaxNameLength uint64 /* f_namemax: maximum filename length */
}
// Type returns the SSH_FXP_EXTENDED_REPLY packet type.
func (ep *StatVFSExtendedReplyPacket) Type() sshfx.PacketType {
return sshfx.PacketTypeExtendedReply
}
// MarshalPacket returns ep as a two-part binary encoding of the full extended reply packet.
func (ep *StatVFSExtendedReplyPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
p := &sshfx.ExtendedReplyPacket{
Data: ep,
}
return p.MarshalPacket(reqid, b)
}
// UnmarshalPacketBody returns ep as a two-part binary encoding of the full extended reply packet.
func (ep *StatVFSExtendedReplyPacket) UnmarshalPacketBody(buf *sshfx.Buffer) (err error) {
p := &sshfx.ExtendedReplyPacket{
Data: ep,
}
return p.UnmarshalPacketBody(buf)
}
// MarshalInto encodes ep into the binary encoding of the (f)statvfs@openssh.com extended reply packet-specific data.
func (ep *StatVFSExtendedReplyPacket) MarshalInto(buf *sshfx.Buffer) {
buf.AppendUint64(ep.BlockSize)
buf.AppendUint64(ep.FragmentSize)
buf.AppendUint64(ep.Blocks)
buf.AppendUint64(ep.BlocksFree)
buf.AppendUint64(ep.BlocksAvail)
buf.AppendUint64(ep.Files)
buf.AppendUint64(ep.FilesFree)
buf.AppendUint64(ep.FilesAvail)
buf.AppendUint64(ep.FilesystemID)
buf.AppendUint64(ep.MountFlags)
buf.AppendUint64(ep.MaxNameLength)
}
// MarshalBinary encodes ep into the binary encoding of the (f)statvfs@openssh.com extended reply packet-specific data.
//
// NOTE: This _only_ encodes the packet-specific data, it does not encode the full extended reply packet.
func (ep *StatVFSExtendedReplyPacket) MarshalBinary() ([]byte, error) {
size := 11 * 8 // 11 × uint64(various)
b := sshfx.NewBuffer(make([]byte, 0, size))
ep.MarshalInto(b)
return b.Bytes(), nil
}
// UnmarshalFrom decodes the fstatvfs@openssh.com extended reply packet-specific data into ep.
func (ep *StatVFSExtendedReplyPacket) UnmarshalFrom(buf *sshfx.Buffer) (err error) {
if ep.BlockSize, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.FragmentSize, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.Blocks, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.BlocksFree, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.BlocksAvail, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.Files, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.FilesFree, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.FilesAvail, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.FilesystemID, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.MountFlags, err = buf.ConsumeUint64(); err != nil {
return err
}
if ep.MaxNameLength, err = buf.ConsumeUint64(); err != nil {
return err
}
return nil
}
// UnmarshalBinary decodes the fstatvfs@openssh.com extended reply packet-specific data into ep.
func (ep *StatVFSExtendedReplyPacket) UnmarshalBinary(data []byte) (err error) {
return ep.UnmarshalFrom(sshfx.NewBuffer(data))
}

239
internal/encoding/ssh/filexfer/openssh/statvfs_test.go Normal file
View file

@ -0,0 +1,239 @@
package openssh
import (
"bytes"
"testing"
sshfx "github.com/pkg/sftp/internal/encoding/ssh/filexfer"
)
var _ sshfx.PacketMarshaller = &StatVFSExtendedPacket{}
func init() {
RegisterExtensionStatVFS()
}
func TestStatVFSExtendedPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
ep := &StatVFSExtendedPacket{
Path: path,
}
data, err := sshfx.ComposePacket(ep.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 36,
200,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 19, 's', 't', 'a', 't', 'v', 'f', 's', '@', 'o', 'p', 'e', 'n', 's', 's', 'h', '.', 'c', 'o', 'm',
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(data, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", data, want)
}
var p sshfx.ExtendedPacket
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(sshfx.NewBuffer(data[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extensionStatVFS {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extensionStatVFS)
}
ep, ok := p.Data.(*StatVFSExtendedPacket)
if !ok {
t.Fatalf("UnmarshaledPacketBody(): Data was type %T, but expected *StatVFSExtendedPacket", p.Data)
}
if ep.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", ep.Path, path)
}
}
var _ sshfx.PacketMarshaller = &FStatVFSExtendedPacket{}
func init() {
RegisterExtensionFStatVFS()
}
func TestFStatVFSExtendedPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
ep := &FStatVFSExtendedPacket{
Path: path,
}
data, err := sshfx.ComposePacket(ep.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 37,
200,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 20, 'f', 's', 't', 'a', 't', 'v', 'f', 's', '@', 'o', 'p', 'e', 'n', 's', 's', 'h', '.', 'c', 'o', 'm',
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(data, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", data, want)
}
var p sshfx.ExtendedPacket
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(sshfx.NewBuffer(data[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.ExtendedRequest != extensionFStatVFS {
t.Errorf("UnmarshalPacketBody(): ExtendedRequest was %q, but expected %q", p.ExtendedRequest, extensionFStatVFS)
}
ep, ok := p.Data.(*FStatVFSExtendedPacket)
if !ok {
t.Fatalf("UnmarshaledPacketBody(): Data was type %T, but expected *FStatVFSExtendedPacket", p.Data)
}
if ep.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", ep.Path, path)
}
}
var _ sshfx.Packet = &StatVFSExtendedReplyPacket{}
func TestStatVFSExtendedReplyPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
const (
BlockSize = uint64(iota + 13)
FragmentSize
Blocks
BlocksFree
BlocksAvail
Files
FilesFree
FilesAvail
FilesystemID
MountFlags
MaxNameLength
)
ep := &StatVFSExtendedReplyPacket{
BlockSize: BlockSize,
FragmentSize: FragmentSize,
Blocks: Blocks,
BlocksFree: BlocksFree,
BlocksAvail: BlocksAvail,
Files: Files,
FilesFree: FilesFree,
FilesAvail: FilesAvail,
FilesystemID: FilesystemID,
MountFlags: MountFlags,
MaxNameLength: MaxNameLength,
}
data, err := sshfx.ComposePacket(ep.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 93,
201,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 13,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 14,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 15,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 16,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 17,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 18,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 19,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 20,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 21,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 22,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 23,
}
if !bytes.Equal(data, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", data, want)
}
*ep = StatVFSExtendedReplyPacket{}
p := sshfx.ExtendedReplyPacket{
Data: ep,
}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(sshfx.NewBuffer(data[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
ep, ok := p.Data.(*StatVFSExtendedReplyPacket)
if !ok {
t.Fatalf("UnmarshaledPacketBody(): Data was type %T, but expected *StatVFSExtendedReplyPacket", p.Data)
}
if ep.BlockSize != BlockSize {
t.Errorf("UnmarshalPacketBody(): BlockSize was %d, but expected %d", ep.BlockSize, BlockSize)
}
if ep.FragmentSize != FragmentSize {
t.Errorf("UnmarshalPacketBody(): FragmentSize was %d, but expected %d", ep.FragmentSize, FragmentSize)
}
if ep.Blocks != Blocks {
t.Errorf("UnmarshalPacketBody(): Blocks was %d, but expected %d", ep.Blocks, Blocks)
}
if ep.BlocksFree != BlocksFree {
t.Errorf("UnmarshalPacketBody(): BlocksFree was %d, but expected %d", ep.BlocksFree, BlocksFree)
}
if ep.BlocksAvail != BlocksAvail {
t.Errorf("UnmarshalPacketBody(): BlocksAvail was %d, but expected %d", ep.BlocksAvail, BlocksAvail)
}
if ep.Files != Files {
t.Errorf("UnmarshalPacketBody(): Files was %d, but expected %d", ep.Files, Files)
}
if ep.FilesFree != FilesFree {
t.Errorf("UnmarshalPacketBody(): FilesFree was %d, but expected %d", ep.FilesFree, FilesFree)
}
if ep.FilesAvail != FilesAvail {
t.Errorf("UnmarshalPacketBody(): FilesAvail was %d, but expected %d", ep.FilesAvail, FilesAvail)
}
if ep.FilesystemID != FilesystemID {
t.Errorf("UnmarshalPacketBody(): FilesystemID was %d, but expected %d", ep.FilesystemID, FilesystemID)
}
if ep.MountFlags != MountFlags {
t.Errorf("UnmarshalPacketBody(): MountFlags was %d, but expected %d", ep.MountFlags, MountFlags)
}
if ep.MaxNameLength != MaxNameLength {
t.Errorf("UnmarshalPacketBody(): MaxNameLength was %d, but expected %d", ep.MaxNameLength, MaxNameLength)
}
}

323
internal/encoding/ssh/filexfer/packets.go Normal file
View file

@ -0,0 +1,323 @@
package filexfer
import (
"errors"
"fmt"
"io"
)
// smallBufferSize is an initial allocation minimal capacity.
const smallBufferSize = 64
func newPacketFromType(typ PacketType) (Packet, error) {
switch typ {
case PacketTypeOpen:
return new(OpenPacket), nil
case PacketTypeClose:
return new(ClosePacket), nil
case PacketTypeRead:
return new(ReadPacket), nil
case PacketTypeWrite:
return new(WritePacket), nil
case PacketTypeLStat:
return new(LStatPacket), nil
case PacketTypeFStat:
return new(FStatPacket), nil
case PacketTypeSetstat:
return new(SetstatPacket), nil
case PacketTypeFSetstat:
return new(FSetstatPacket), nil
case PacketTypeOpenDir:
return new(OpenDirPacket), nil
case PacketTypeReadDir:
return new(ReadDirPacket), nil
case PacketTypeRemove:
return new(RemovePacket), nil
case PacketTypeMkdir:
return new(MkdirPacket), nil
case PacketTypeRmdir:
return new(RmdirPacket), nil
case PacketTypeRealPath:
return new(RealPathPacket), nil
case PacketTypeStat:
return new(StatPacket), nil
case PacketTypeRename:
return new(RenamePacket), nil
case PacketTypeReadLink:
return new(ReadLinkPacket), nil
case PacketTypeSymlink:
return new(SymlinkPacket), nil
case PacketTypeExtended:
return new(ExtendedPacket), nil
default:
return nil, fmt.Errorf("unexpected request packet type: %v", typ)
}
}
// RawPacket implements the general packet format from draft-ietf-secsh-filexfer-02
//
// RawPacket is intended for use in clients receiving responses,
// where a response will be expected to be of a limited number of types,
// and unmarshaling unknown/unexpected response packets is unnecessary.
//
// For servers expecting to receive arbitrary request packet types,
// use RequestPacket.
//
// Defined in https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-3
type RawPacket struct {
PacketType PacketType
RequestID uint32
Data Buffer
}
// Type returns the Type field defining the SSH_FXP_xy type for this packet.
func (p *RawPacket) Type() PacketType {
return p.PacketType
}
// Reset clears the pointers and reference-semantic variables of RawPacket,
// releasing underlying resources, and making them and the RawPacket suitable to be reused,
// so long as no other references have been kept.
func (p *RawPacket) Reset() {
p.Data = Buffer{}
}
// MarshalPacket returns p as a two-part binary encoding of p.
//
// The internal p.RequestID is overridden by the reqid argument.
func (p *RawPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
buf = NewMarshalBuffer(0)
}
buf.StartPacket(p.PacketType, reqid)
return buf.Packet(p.Data.Bytes())
}
// MarshalBinary returns p as the binary encoding of p.
//
// This is a convenience implementation primarily intended for tests,
// because it is inefficient with allocations.
func (p *RawPacket) MarshalBinary() ([]byte, error) {
return ComposePacket(p.MarshalPacket(p.RequestID, nil))
}
// UnmarshalFrom decodes a RawPacket from the given Buffer into p.
//
// The Data field will alias the passed in Buffer,
// so the buffer passed in should not be reused before RawPacket.Reset().
func (p *RawPacket) UnmarshalFrom(buf *Buffer) error {
typ, err := buf.ConsumeUint8()
if err != nil {
return err
}
p.PacketType = PacketType(typ)
if p.RequestID, err = buf.ConsumeUint32(); err != nil {
return err
}
p.Data = *buf
return nil
}
// UnmarshalBinary decodes a full raw packet out of the given data.
// It is assumed that the uint32(length) has already been consumed to receive the data.
//
// This is a convenience implementation primarily intended for tests,
// because this must clone the given data byte slice,
// as Data is not allowed to alias any part of the data byte slice.
func (p *RawPacket) UnmarshalBinary(data []byte) error {
clone := make([]byte, len(data))
n := copy(clone, data)
return p.UnmarshalFrom(NewBuffer(clone[:n]))
}
// readPacket reads a uint32 length-prefixed binary data packet from r.
// using the given byte slice as a backing array.
//
// If the packet length read from r is bigger than maxPacketLength,
// or greater than math.MaxInt32 on a 32-bit implementation,
// then a `ErrLongPacket` error will be returned.
//
// If the given byte slice is insufficient to hold the packet,
// then it will be extended to fill the packet size.
func readPacket(r io.Reader, b []byte, maxPacketLength uint32) ([]byte, error) {
if cap(b) < 4 {
// We will need allocate our own buffer just for reading the packet length.
// However, we don’t really want to allocate an extremely narrow buffer (4-bytes),
// and cause unnecessary allocation churn from both length reads and small packet reads,
// so we use smallBufferSize from the bytes package as a reasonable guess.
// But if callers really do want to force narrow throw-away allocation of every packet body,
// they can do so with a buffer of capacity 4.
b = make([]byte, smallBufferSize)
}
if _, err := io.ReadFull(r, b[:4]); err != nil {
return nil, err
}
length := unmarshalUint32(b)
if int(length) < 5 {
// Must have at least uint8(type) and uint32(request-id)
if int(length) < 0 {
// Only possible when strconv.IntSize == 32,
// the packet length is longer than math.MaxInt32,
// and thus longer than any possible slice.
return nil, ErrLongPacket
}
return nil, ErrShortPacket
}
if length > maxPacketLength {
return nil, ErrLongPacket
}
if int(length) > cap(b) {
// We know int(length) must be positive, because of tests above.
b = make([]byte, length)
}
n, err := io.ReadFull(r, b[:length])
return b[:n], err
}
// ReadFrom provides a simple functional packet reader,
// using the given byte slice as a backing array.
//
// To protect against potential denial of service attacks,
// if the read packet length is longer than maxPacketLength,
// then no packet data will be read, and ErrLongPacket will be returned.
// (On 32-bit int architectures, all packets >= 2^31 in length
// will return ErrLongPacket regardless of maxPacketLength.)
//
// If the read packet length is longer than cap(b),
// then a throw-away slice will allocated to meet the exact packet length.
// This can be used to limit the length of reused buffers,
// while still allowing reception of occasional large packets.
//
// The Data field may alias the passed in byte slice,
// so the byte slice passed in should not be reused before RawPacket.Reset().
func (p *RawPacket) ReadFrom(r io.Reader, b []byte, maxPacketLength uint32) error {
b, err := readPacket(r, b, maxPacketLength)
if err != nil {
return err
}
return p.UnmarshalFrom(NewBuffer(b))
}
// RequestPacket implements the general packet format from draft-ietf-secsh-filexfer-02
// but also automatically decode/encodes valid request packets (2 < type < 100 || type == 200).
//
// RequestPacket is intended for use in servers receiving requests,
// where any arbitrary request may be received, and so decoding them automatically
// is useful.
//
// For clients expecting to receive specific response packet types,
// where automatic unmarshaling of the packet body does not make sense,
// use RawPacket.
//
// Defined in https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-3
type RequestPacket struct {
RequestID uint32
Request Packet
}
// Type returns the SSH_FXP_xy value associated with the underlying packet.
func (p *RequestPacket) Type() PacketType {
return p.Request.Type()
}
// Reset clears the pointers and reference-semantic variables in RequestPacket,
// releasing underlying resources, and making them and the RequestPacket suitable to be reused,
// so long as no other references have been kept.
func (p *RequestPacket) Reset() {
p.Request = nil
}
// MarshalPacket returns p as a two-part binary encoding of p.
//
// The internal p.RequestID is overridden by the reqid argument.
func (p *RequestPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
if p.Request == nil {
return nil, nil, errors.New("empty request packet")
}
return p.Request.MarshalPacket(reqid, b)
}
// MarshalBinary returns p as the binary encoding of p.
//
// This is a convenience implementation primarily intended for tests,
// because it is inefficient with allocations.
func (p *RequestPacket) MarshalBinary() ([]byte, error) {
return ComposePacket(p.MarshalPacket(p.RequestID, nil))
}
// UnmarshalFrom decodes a RequestPacket from the given Buffer into p.
//
// The Request field may alias the passed in Buffer, (e.g. SSH_FXP_WRITE),
// so the buffer passed in should not be reused before RequestPacket.Reset().
func (p *RequestPacket) UnmarshalFrom(buf *Buffer) error {
typ, err := buf.ConsumeUint8()
if err != nil {
return err
}
p.Request, err = newPacketFromType(PacketType(typ))
if err != nil {
return err
}
if p.RequestID, err = buf.ConsumeUint32(); err != nil {
return err
}
return p.Request.UnmarshalPacketBody(buf)
}
// UnmarshalBinary decodes a full request packet out of the given data.
// It is assumed that the uint32(length) has already been consumed to receive the data.
//
// This is a convenience implementation primarily intended for tests,
// because this must clone the given data byte slice,
// as Request is not allowed to alias any part of the data byte slice.
func (p *RequestPacket) UnmarshalBinary(data []byte) error {
clone := make([]byte, len(data))
n := copy(clone, data)
return p.UnmarshalFrom(NewBuffer(clone[:n]))
}
// ReadFrom provides a simple functional packet reader,
// using the given byte slice as a backing array.
//
// To protect against potential denial of service attacks,
// if the read packet length is longer than maxPacketLength,
// then no packet data will be read, and ErrLongPacket will be returned.
// (On 32-bit int architectures, all packets >= 2^31 in length
// will return ErrLongPacket regardless of maxPacketLength.)
//
// If the read packet length is longer than cap(b),
// then a throw-away slice will allocated to meet the exact packet length.
// This can be used to limit the length of reused buffers,
// while still allowing reception of occasional large packets.
//
// The Request field may alias the passed in byte slice,
// so the byte slice passed in should not be reused before RawPacket.Reset().
func (p *RequestPacket) ReadFrom(r io.Reader, b []byte, maxPacketLength uint32) error {
b, err := readPacket(r, b, maxPacketLength)
if err != nil {
return err
}
return p.UnmarshalFrom(NewBuffer(b))
}

132
internal/encoding/ssh/filexfer/packets_test.go Normal file
View file

@ -0,0 +1,132 @@
package filexfer
import (
"bytes"
"testing"
)
func TestRawPacket(t *testing.T) {
const (
id = 42
errMsg = "eof"
langTag = "en"
)
p := &RawPacket{
PacketType: PacketTypeStatus,
RequestID: id,
Data: Buffer{
b: []byte{
0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x03, 'e', 'o', 'f',
0x00, 0x00, 0x00, 0x02, 'e', 'n',
},
},
}
buf, err := p.MarshalBinary()
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 22,
101,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 3, 'e', 'o', 'f',
0x00, 0x00, 0x00, 2, 'e', 'n',
}
if !bytes.Equal(buf, want) {
t.Errorf("RawPacket.MarshalBinary() = %X, but wanted %X", buf, want)
}
*p = RawPacket{}
if err := p.ReadFrom(bytes.NewReader(buf), nil, DefaultMaxPacketLength); err != nil {
t.Fatal("unexpected error:", err)
}
if p.PacketType != PacketTypeStatus {
t.Errorf("RawPacket.UnmarshalBinary(): Type was %v, but expected %v", p.PacketType, PacketTypeStat)
}
if p.RequestID != uint32(id) {
t.Errorf("RawPacket.UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
}
want = []byte{
0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 3, 'e', 'o', 'f',
0x00, 0x00, 0x00, 2, 'e', 'n',
}
if !bytes.Equal(p.Data.Bytes(), want) {
t.Fatalf("RawPacket.UnmarshalBinary(): Data was %X, but expected %X", p.Data, want)
}
var resp StatusPacket
resp.UnmarshalPacketBody(&p.Data)
if resp.StatusCode != StatusEOF {
t.Errorf("UnmarshalPacketBody(): StatusCode was %v, but expected %v", resp.StatusCode, StatusEOF)
}
if resp.ErrorMessage != errMsg {
t.Errorf("UnmarshalPacketBody(): ErrorMessage was %q, but expected %q", resp.ErrorMessage, errMsg)
}
if resp.LanguageTag != langTag {
t.Errorf("UnmarshalPacketBody(): LanguageTag was %q, but expected %q", resp.LanguageTag, langTag)
}
}
func TestRequestPacket(t *testing.T) {
const (
id = 42
path = "foo"
)
p := &RequestPacket{
RequestID: id,
Request: &StatPacket{
Path: path,
},
}
buf, err := p.MarshalBinary()
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 12,
17,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 3, 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Errorf("RequestPacket.MarshalBinary() = %X, but wanted %X", buf, want)
}
*p = RequestPacket{}
if err := p.ReadFrom(bytes.NewReader(buf), nil, DefaultMaxPacketLength); err != nil {
t.Fatal("unexpected error:", err)
}
if p.RequestID != uint32(id) {
t.Errorf("RequestPacket.UnmarshalBinary(): RequestID was %d, but expected %d", p.RequestID, id)
}
req, ok := p.Request.(*StatPacket)
if !ok {
t.Fatalf("unexpected Request type was %T, but expected %T", p.Request, req)
}
if req.Path != path {
t.Errorf("RequestPacket.UnmarshalBinary(): Request.Path was %q, but expected %q", req.Path, path)
}
}

368
internal/encoding/ssh/filexfer/path_packets.go Normal file
View file

@ -0,0 +1,368 @@
package filexfer
// LStatPacket defines the SSH_FXP_LSTAT packet.
type LStatPacket struct {
Path string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *LStatPacket) Type() PacketType {
return PacketTypeLStat
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *LStatPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) // string(path)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeLStat, reqid)
buf.AppendString(p.Path)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *LStatPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// SetstatPacket defines the SSH_FXP_SETSTAT packet.
type SetstatPacket struct {
Path string
Attrs Attributes
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *SetstatPacket) Type() PacketType {
return PacketTypeSetstat
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *SetstatPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) + p.Attrs.Len() // string(path) + ATTRS(attrs)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeSetstat, reqid)
buf.AppendString(p.Path)
p.Attrs.MarshalInto(buf)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *SetstatPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return p.Attrs.UnmarshalFrom(buf)
}
// RemovePacket defines the SSH_FXP_REMOVE packet.
type RemovePacket struct {
Path string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *RemovePacket) Type() PacketType {
return PacketTypeRemove
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *RemovePacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) // string(path)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeRemove, reqid)
buf.AppendString(p.Path)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *RemovePacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// MkdirPacket defines the SSH_FXP_MKDIR packet.
type MkdirPacket struct {
Path string
Attrs Attributes
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *MkdirPacket) Type() PacketType {
return PacketTypeMkdir
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *MkdirPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) + p.Attrs.Len() // string(path) + ATTRS(attrs)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeMkdir, reqid)
buf.AppendString(p.Path)
p.Attrs.MarshalInto(buf)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *MkdirPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return p.Attrs.UnmarshalFrom(buf)
}
// RmdirPacket defines the SSH_FXP_RMDIR packet.
type RmdirPacket struct {
Path string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *RmdirPacket) Type() PacketType {
return PacketTypeRmdir
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *RmdirPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) // string(path)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeRmdir, reqid)
buf.AppendString(p.Path)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *RmdirPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// RealPathPacket defines the SSH_FXP_REALPATH packet.
type RealPathPacket struct {
Path string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *RealPathPacket) Type() PacketType {
return PacketTypeRealPath
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *RealPathPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) // string(path)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeRealPath, reqid)
buf.AppendString(p.Path)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *RealPathPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// StatPacket defines the SSH_FXP_STAT packet.
type StatPacket struct {
Path string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *StatPacket) Type() PacketType {
return PacketTypeStat
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *StatPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) // string(path)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeStat, reqid)
buf.AppendString(p.Path)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *StatPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// RenamePacket defines the SSH_FXP_RENAME packet.
type RenamePacket struct {
OldPath string
NewPath string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *RenamePacket) Type() PacketType {
return PacketTypeRename
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *RenamePacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
// string(oldpath) + string(newpath)
size := 4 + len(p.OldPath) + 4 + len(p.NewPath)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeRename, reqid)
buf.AppendString(p.OldPath)
buf.AppendString(p.NewPath)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *RenamePacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.OldPath, err = buf.ConsumeString(); err != nil {
return err
}
if p.NewPath, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// ReadLinkPacket defines the SSH_FXP_READLINK packet.
type ReadLinkPacket struct {
Path string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *ReadLinkPacket) Type() PacketType {
return PacketTypeReadLink
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *ReadLinkPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Path) // string(path)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeReadLink, reqid)
buf.AppendString(p.Path)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *ReadLinkPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Path, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// SymlinkPacket defines the SSH_FXP_SYMLINK packet.
//
// The order of the arguments to the SSH_FXP_SYMLINK method was inadvertently reversed.
// Unfortunately, the reversal was not noticed until the server was widely deployed.
// Covered in Section 3.1 of https://github.com/openssh/openssh-portable/blob/master/PROTOCOL
type SymlinkPacket struct {
LinkPath string
TargetPath string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *SymlinkPacket) Type() PacketType {
return PacketTypeSymlink
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *SymlinkPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
// string(targetpath) + string(linkpath)
size := 4 + len(p.TargetPath) + 4 + len(p.LinkPath)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeSymlink, reqid)
// Arguments were inadvertently reversed.
buf.AppendString(p.TargetPath)
buf.AppendString(p.LinkPath)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *SymlinkPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
// Arguments were inadvertently reversed.
if p.TargetPath, err = buf.ConsumeString(); err != nil {
return err
}
if p.LinkPath, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}

450
internal/encoding/ssh/filexfer/path_packets_test.go Normal file
View file

@ -0,0 +1,450 @@
package filexfer
import (
"bytes"
"testing"
)
var _ Packet = &LStatPacket{}
func TestLStatPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
p := &LStatPacket{
Path: path,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
7,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = LStatPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
}
var _ Packet = &SetstatPacket{}
func TestSetstatPacket(t *testing.T) {
const (
id = 42
path = "/foo"
perms = 0x87654321
)
p := &SetstatPacket{
Path: "/foo",
Attrs: Attributes{
Flags: AttrPermissions,
Permissions: perms,
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 21,
9,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
0x00, 0x00, 0x00, 0x04,
0x87, 0x65, 0x43, 0x21,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = SetstatPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
if p.Attrs.Flags != AttrPermissions {
t.Errorf("UnmarshalPacketBody(): Attrs.Flags was %#x, but expected %#x", p.Attrs.Flags, AttrPermissions)
}
if p.Attrs.Permissions != perms {
t.Errorf("UnmarshalPacketBody(): Attrs.Permissions was %#v, but expected %#v", p.Attrs.Permissions, perms)
}
}
var _ Packet = &RemovePacket{}
func TestRemovePacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
p := &RemovePacket{
Path: path,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
13,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = RemovePacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
}
var _ Packet = &MkdirPacket{}
func TestMkdirPacket(t *testing.T) {
const (
id = 42
path = "/foo"
perms = 0x87654321
)
p := &MkdirPacket{
Path: "/foo",
Attrs: Attributes{
Flags: AttrPermissions,
Permissions: perms,
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 21,
14,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
0x00, 0x00, 0x00, 0x04,
0x87, 0x65, 0x43, 0x21,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = MkdirPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
if p.Attrs.Flags != AttrPermissions {
t.Errorf("UnmarshalPacketBody(): Attrs.Flags was %#x, but expected %#x", p.Attrs.Flags, AttrPermissions)
}
if p.Attrs.Permissions != perms {
t.Errorf("UnmarshalPacketBody(): Attrs.Permissions was %#v, but expected %#v", p.Attrs.Permissions, perms)
}
}
var _ Packet = &RmdirPacket{}
func TestRmdirPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
p := &RmdirPacket{
Path: path,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
15,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = RmdirPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
}
var _ Packet = &RealPathPacket{}
func TestRealPathPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
p := &RealPathPacket{
Path: path,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
16,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = RealPathPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
}
var _ Packet = &StatPacket{}
func TestStatPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
p := &StatPacket{
Path: path,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
17,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = StatPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
}
var _ Packet = &RenamePacket{}
func TestRenamePacket(t *testing.T) {
const (
id = 42
oldpath = "/foo"
newpath = "/bar"
)
p := &RenamePacket{
OldPath: oldpath,
NewPath: newpath,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 21,
18,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
0x00, 0x00, 0x00, 4, '/', 'b', 'a', 'r',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = RenamePacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.OldPath != oldpath {
t.Errorf("UnmarshalPacketBody(): OldPath was %q, but expected %q", p.OldPath, oldpath)
}
if p.NewPath != newpath {
t.Errorf("UnmarshalPacketBody(): NewPath was %q, but expected %q", p.NewPath, newpath)
}
}
var _ Packet = &ReadLinkPacket{}
func TestReadLinkPacket(t *testing.T) {
const (
id = 42
path = "/foo"
)
p := &ReadLinkPacket{
Path: path,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
19,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = ReadLinkPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Path != path {
t.Errorf("UnmarshalPacketBody(): Path was %q, but expected %q", p.Path, path)
}
}
var _ Packet = &SymlinkPacket{}
func TestSymlinkPacket(t *testing.T) {
const (
id = 42
linkpath = "/foo"
targetpath = "/bar"
)
p := &SymlinkPacket{
LinkPath: linkpath,
TargetPath: targetpath,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 21,
20,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 4, '/', 'b', 'a', 'r', // Arguments were inadvertently reversed.
0x00, 0x00, 0x00, 4, '/', 'f', 'o', 'o',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = SymlinkPacket{}
// UnmarshalPacketBody assumes the (length, type, request-id) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.LinkPath != linkpath {
t.Errorf("UnmarshalPacketBody(): LinkPath was %q, but expected %q", p.LinkPath, linkpath)
}
if p.TargetPath != targetpath {
t.Errorf("UnmarshalPacketBody(): TargetPath was %q, but expected %q", p.TargetPath, targetpath)
}
}

114
internal/encoding/ssh/filexfer/permissions.go Normal file
View file

@ -0,0 +1,114 @@
package filexfer
// FileMode represents a file’s mode and permission bits.
// The bits are defined according to POSIX standards,
// and may not apply to the OS being built for.
type FileMode uint32
// Permission flags, defined here to avoid potential inconsistencies in individual OS implementations.
const (
ModePerm FileMode = 0o0777 // S_IRWXU | S_IRWXG | S_IRWXO
ModeUserRead FileMode = 0o0400 // S_IRUSR
ModeUserWrite FileMode = 0o0200 // S_IWUSR
ModeUserExec FileMode = 0o0100 // S_IXUSR
ModeGroupRead FileMode = 0o0040 // S_IRGRP
ModeGroupWrite FileMode = 0o0020 // S_IWGRP
ModeGroupExec FileMode = 0o0010 // S_IXGRP
ModeOtherRead FileMode = 0o0004 // S_IROTH
ModeOtherWrite FileMode = 0o0002 // S_IWOTH
ModeOtherExec FileMode = 0o0001 // S_IXOTH
ModeSetUID FileMode = 0o4000 // S_ISUID
ModeSetGID FileMode = 0o2000 // S_ISGID
ModeSticky FileMode = 0o1000 // S_ISVTX
ModeType FileMode = 0xF000 // S_IFMT
ModeNamedPipe FileMode = 0x1000 // S_IFIFO
ModeCharDevice FileMode = 0x2000 // S_IFCHR
ModeDir FileMode = 0x4000 // S_IFDIR
ModeDevice FileMode = 0x6000 // S_IFBLK
ModeRegular FileMode = 0x8000 // S_IFREG
ModeSymlink FileMode = 0xA000 // S_IFLNK
ModeSocket FileMode = 0xC000 // S_IFSOCK
)
// IsDir reports whether m describes a directory.
// That is, it tests for m.Type() == ModeDir.
func (m FileMode) IsDir() bool {
return (m & ModeType) == ModeDir
}
// IsRegular reports whether m describes a regular file.
// That is, it tests for m.Type() == ModeRegular
func (m FileMode) IsRegular() bool {
return (m & ModeType) == ModeRegular
}
// Perm returns the POSIX permission bits in m (m & ModePerm).
func (m FileMode) Perm() FileMode {
return (m & ModePerm)
}
// Type returns the type bits in m (m & ModeType).
func (m FileMode) Type() FileMode {
return (m & ModeType)
}
// String returns a `-rwxrwxrwx` style string representing the `ls -l` POSIX permissions string.
func (m FileMode) String() string {
var buf [10]byte
switch m.Type() {
case ModeRegular:
buf[0] = '-'
case ModeDir:
buf[0] = 'd'
case ModeSymlink:
buf[0] = 'l'
case ModeDevice:
buf[0] = 'b'
case ModeCharDevice:
buf[0] = 'c'
case ModeNamedPipe:
buf[0] = 'p'
case ModeSocket:
buf[0] = 's'
default:
buf[0] = '?'
}
const rwx = "rwxrwxrwx"
for i, c := range rwx {
if m&(1<<uint(9-1-i)) != 0 {
buf[i+1] = byte(c)
} else {
buf[i+1] = '-'
}
}
if m&ModeSetUID != 0 {
if buf[3] == 'x' {
buf[3] = 's'
} else {
buf[3] = 'S'
}
}
if m&ModeSetGID != 0 {
if buf[6] == 'x' {
buf[6] = 's'
} else {
buf[6] = 'S'
}
}
if m&ModeSticky != 0 {
if buf[9] == 'x' {
buf[9] = 't'
} else {
buf[9] = 'T'
}
}
return string(buf[:])
}

243
internal/encoding/ssh/filexfer/response_packets.go Normal file
View file

@ -0,0 +1,243 @@
package filexfer
import (
"fmt"
)
// StatusPacket defines the SSH_FXP_STATUS packet.
//
// Specified in https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-7
type StatusPacket struct {
StatusCode Status
ErrorMessage string
LanguageTag string
}
// Error makes StatusPacket an error type.
func (p *StatusPacket) Error() string {
if p.ErrorMessage == "" {
return "sftp: " + p.StatusCode.String()
}
return fmt.Sprintf("sftp: %q (%s)", p.ErrorMessage, p.StatusCode)
}
// Is returns true if target is a StatusPacket with the same StatusCode,
// or target is a Status code which is the same as SatusCode.
func (p *StatusPacket) Is(target error) bool {
if target, ok := target.(*StatusPacket); ok {
return p.StatusCode == target.StatusCode
}
return p.StatusCode == target
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *StatusPacket) Type() PacketType {
return PacketTypeStatus
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *StatusPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
// uint32(error/status code) + string(error message) + string(language tag)
size := 4 + 4 + len(p.ErrorMessage) + 4 + len(p.LanguageTag)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeStatus, reqid)
buf.AppendUint32(uint32(p.StatusCode))
buf.AppendString(p.ErrorMessage)
buf.AppendString(p.LanguageTag)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *StatusPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
statusCode, err := buf.ConsumeUint32()
if err != nil {
return err
}
p.StatusCode = Status(statusCode)
if p.ErrorMessage, err = buf.ConsumeString(); err != nil {
return err
}
if p.LanguageTag, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// HandlePacket defines the SSH_FXP_HANDLE packet.
type HandlePacket struct {
Handle string
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *HandlePacket) Type() PacketType {
return PacketTypeHandle
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *HandlePacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 + len(p.Handle) // string(handle)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeHandle, reqid)
buf.AppendString(p.Handle)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *HandlePacket) UnmarshalPacketBody(buf *Buffer) (err error) {
if p.Handle, err = buf.ConsumeString(); err != nil {
return err
}
return nil
}
// DataPacket defines the SSH_FXP_DATA packet.
type DataPacket struct {
Data []byte
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *DataPacket) Type() PacketType {
return PacketTypeData
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *DataPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 // uint32(len(data)); data content in payload
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeData, reqid)
buf.AppendUint32(uint32(len(p.Data)))
return buf.Packet(p.Data)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
//
// If p.Data is already populated, and of sufficient length to hold the data,
// then this will copy the data into that byte slice.
//
// If p.Data has a length insufficient to hold the data,
// then this will make a new slice of sufficient length, and copy the data into that.
//
// This means this _does not_ alias any of the data buffer that is passed in.
func (p *DataPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
data, err := buf.ConsumeByteSlice()
if err != nil {
return err
}
if len(p.Data) < len(data) {
p.Data = make([]byte, len(data))
}
n := copy(p.Data, data)
p.Data = p.Data[:n]
return nil
}
// NamePacket defines the SSH_FXP_NAME packet.
type NamePacket struct {
Entries []*NameEntry
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *NamePacket) Type() PacketType {
return PacketTypeName
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *NamePacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := 4 // uint32(len(entries))
for _, e := range p.Entries {
size += e.Len()
}
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeName, reqid)
buf.AppendUint32(uint32(len(p.Entries)))
for _, e := range p.Entries {
e.MarshalInto(buf)
}
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *NamePacket) UnmarshalPacketBody(buf *Buffer) (err error) {
count, err := buf.ConsumeUint32()
if err != nil {
return err
}
p.Entries = make([]*NameEntry, 0, count)
for i := uint32(0); i < count; i++ {
var e NameEntry
if err := e.UnmarshalFrom(buf); err != nil {
return err
}
p.Entries = append(p.Entries, &e)
}
return nil
}
// AttrsPacket defines the SSH_FXP_ATTRS packet.
type AttrsPacket struct {
Attrs Attributes
}
// Type returns the SSH_FXP_xy value associated with this packet type.
func (p *AttrsPacket) Type() PacketType {
return PacketTypeAttrs
}
// MarshalPacket returns p as a two-part binary encoding of p.
func (p *AttrsPacket) MarshalPacket(reqid uint32, b []byte) (header, payload []byte, err error) {
buf := NewBuffer(b)
if buf.Cap() < 9 {
size := p.Attrs.Len() // ATTRS(attrs)
buf = NewMarshalBuffer(size)
}
buf.StartPacket(PacketTypeAttrs, reqid)
p.Attrs.MarshalInto(buf)
return buf.Packet(payload)
}
// UnmarshalPacketBody unmarshals the packet body from the given Buffer.
// It is assumed that the uint32(request-id) has already been consumed.
func (p *AttrsPacket) UnmarshalPacketBody(buf *Buffer) (err error) {
return p.Attrs.UnmarshalFrom(buf)
}

296
internal/encoding/ssh/filexfer/response_packets_test.go Normal file
View file

@ -0,0 +1,296 @@
package filexfer
import (
"bytes"
"errors"
"testing"
)
func TestStatusPacketIs(t *testing.T) {
status := &StatusPacket{
StatusCode: StatusFailure,
ErrorMessage: "error message",
LanguageTag: "language tag",
}
if !errors.Is(status, StatusFailure) {
t.Error("errors.Is(StatusFailure, StatusFailure) != true")
}
if !errors.Is(status, &StatusPacket{StatusCode: StatusFailure}) {
t.Error("errors.Is(StatusFailure, StatusPacket{StatusFailure}) != true")
}
if errors.Is(status, StatusOK) {
t.Error("errors.Is(StatusFailure, StatusFailure) == true")
}
if errors.Is(status, &StatusPacket{StatusCode: StatusOK}) {
t.Error("errors.Is(StatusFailure, StatusPacket{StatusFailure}) == true")
}
}
var _ Packet = &StatusPacket{}
func TestStatusPacket(t *testing.T) {
const (
id = 42
statusCode = StatusBadMessage
errorMessage = "foo"
languageTag = "x-example"
)
p := &StatusPacket{
StatusCode: statusCode,
ErrorMessage: errorMessage,
LanguageTag: languageTag,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 29,
101,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 5,
0x00, 0x00, 0x00, 3, 'f', 'o', 'o',
0x00, 0x00, 0x00, 9, 'x', '-', 'e', 'x', 'a', 'm', 'p', 'l', 'e',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = StatusPacket{}
// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.StatusCode != statusCode {
t.Errorf("UnmarshalBinary(): StatusCode was %v, but expected %v", p.StatusCode, statusCode)
}
if p.ErrorMessage != errorMessage {
t.Errorf("UnmarshalBinary(): ErrorMessage was %q, but expected %q", p.ErrorMessage, errorMessage)
}
if p.LanguageTag != languageTag {
t.Errorf("UnmarshalBinary(): LanguageTag was %q, but expected %q", p.LanguageTag, languageTag)
}
}
var _ Packet = &HandlePacket{}
func TestHandlePacket(t *testing.T) {
const (
id = 42
handle = "somehandle"
)
p := &HandlePacket{
Handle: "somehandle",
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 19,
102,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 10, 's', 'o', 'm', 'e', 'h', 'a', 'n', 'd', 'l', 'e',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = HandlePacket{}
// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Handle != handle {
t.Errorf("UnmarshalBinary(): Handle was %q, but expected %q", p.Handle, handle)
}
}
var _ Packet = &DataPacket{}
func TestDataPacket(t *testing.T) {
const (
id = 42
)
var payload = []byte(`foobar`)
p := &DataPacket{
Data: payload,
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 15,
103,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 6, 'f', 'o', 'o', 'b', 'a', 'r',
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = DataPacket{}
// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if !bytes.Equal(p.Data, payload) {
t.Errorf("UnmarshalBinary(): Data was %X, but expected %X", p.Data, payload)
}
}
var _ Packet = &NamePacket{}
func TestNamePacket(t *testing.T) {
const (
id = 42
filename = "foo"
longname = "bar"
perms = 0x87654300
)
p := &NamePacket{
Entries: []*NameEntry{
&NameEntry{
Filename: filename + "1",
Longname: longname + "1",
Attrs: Attributes{
Flags: AttrPermissions | (1 << 8),
Permissions: perms | 1,
},
},
&NameEntry{
Filename: filename + "2",
Longname: longname + "2",
Attrs: Attributes{
Flags: AttrPermissions | (2 << 8),
Permissions: perms | 2,
},
},
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 57,
104,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 0x02,
0x00, 0x00, 0x00, 4, 'f', 'o', 'o', '1',
0x00, 0x00, 0x00, 4, 'b', 'a', 'r', '1',
0x00, 0x00, 0x01, 0x04,
0x87, 0x65, 0x43, 0x01,
0x00, 0x00, 0x00, 4, 'f', 'o', 'o', '2',
0x00, 0x00, 0x00, 4, 'b', 'a', 'r', '2',
0x00, 0x00, 0x02, 0x04,
0x87, 0x65, 0x43, 0x02,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = NamePacket{}
// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if count := len(p.Entries); count != 2 {
t.Fatalf("UnmarshalBinary(): len(NameEntries) was %d, but expected %d", count, 2)
}
for i, e := range p.Entries {
if got, want := e.Filename, filename+string('1'+rune(i)); got != want {
t.Errorf("UnmarshalBinary(): Entries[%d].Filename was %q, but expected %q", i, got, want)
}
if got, want := e.Longname, longname+string('1'+rune(i)); got != want {
t.Errorf("UnmarshalBinary(): Entries[%d].Longname was %q, but expected %q", i, got, want)
}
if got, want := e.Attrs.Flags, AttrPermissions|((i+1)<<8); got != uint32(want) {
t.Errorf("UnmarshalBinary(): Entries[%d].Attrs.Flags was %#x, but expected %#x", i, got, want)
}
if got, want := e.Attrs.Permissions, FileMode(perms|(i+1)); got != want {
t.Errorf("UnmarshalBinary(): Entries[%d].Attrs.Permissions was %#v, but expected %#v", i, got, want)
}
}
}
var _ Packet = &AttrsPacket{}
func TestAttrsPacket(t *testing.T) {
const (
id = 42
perms = 0x87654321
)
p := &AttrsPacket{
Attrs: Attributes{
Flags: AttrPermissions,
Permissions: perms,
},
}
buf, err := ComposePacket(p.MarshalPacket(id, nil))
if err != nil {
t.Fatal("unexpected error:", err)
}
want := []byte{
0x00, 0x00, 0x00, 13,
105,
0x00, 0x00, 0x00, 42,
0x00, 0x00, 0x00, 0x04,
0x87, 0x65, 0x43, 0x21,
}
if !bytes.Equal(buf, want) {
t.Fatalf("MarshalPacket() = %X, but wanted %X", buf, want)
}
*p = AttrsPacket{}
// UnmarshalBinary assumes the uint32(length) + uint8(type) have already been consumed.
if err := p.UnmarshalPacketBody(NewBuffer(buf[9:])); err != nil {
t.Fatal("unexpected error:", err)
}
if p.Attrs.Flags != AttrPermissions {
t.Errorf("UnmarshalBinary(): Attrs.Flags was %#x, but expected %#x", p.Attrs.Flags, AttrPermissions)
}
if p.Attrs.Permissions != perms {
t.Errorf("UnmarshalBinary(): Attrs.Permissions was %#v, but expected %#v", p.Attrs.Permissions, perms)
}
}

157
main.go
View file

@ -1,6 +1,16 @@
package main
import (
"context"
"fmt"
"io"
"io/ioutil"
"net"
"git.deuxfleurs.fr/Deuxfleurs/bagage/sftp"
"git.deuxfleurs.fr/Deuxfleurs/bagage/s3"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/minio/minio-go/v7"
"golang.org/x/crypto/ssh"
"log"
"net/http"
)
@ -11,6 +21,149 @@ func main() {
log.Println(config)
done := make(chan error)
go httpServer(config, done)
go sshServer(config, done)
err := <- done
if err != nil {
log.Fatalf("A component failed: %v", err)
}
}
type s3creds struct {
accessKey string
secretKey string
}
var keychain map[string]s3creds
func sshServer(dconfig* Config, done chan error) {
keychain = make(map[string]s3creds)
config := &ssh.ServerConfig{
PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
log.Printf("Login: %s\n", c.User())
access_key, secret_key, err := LdapGetS3(dconfig, c.User(), string(pass))
if err == nil {
keychain[c.User()] = s3creds{ access_key, secret_key }
}
return nil, err
},
}
privateBytes, err := ioutil.ReadFile(dconfig.SSHKey)
if err != nil {
log.Fatal("Failed to load private key", err)
}
private, err := ssh.ParsePrivateKey(privateBytes)
if err != nil {
log.Fatal("Failed to parse private key", err)
}
config.AddHostKey(private)
// Once a ServerConfig has been configured, connections can be
// accepted.
listener, err := net.Listen("tcp", "0.0.0.0:2222")
if err != nil {
log.Fatal("failed to listen for connection", err)
}
log.Printf("Listening on %v\n", listener.Addr())
for {
nConn, err := listener.Accept()
if err != nil {
log.Printf("failed to accept incoming connection: ", err)
continue
}
go handleSSHConn(nConn, dconfig, config)
}
}
func handleSSHConn(nConn net.Conn, dconfig* Config, config *ssh.ServerConfig) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
defer nConn.Close()
// Before use, a handshake must be performed on the incoming
// net.Conn.
serverConn, chans, reqs, err := ssh.NewServerConn(nConn, config)
if err != nil {
log.Printf("failed to handshake: ", err)
}
defer serverConn.Conn.Close()
user := serverConn.Conn.User()
log.Printf("SSH connection established for %v\n", user)
// The incoming Request channel must be serviced.
go ssh.DiscardRequests(reqs)
// Service the incoming Channel channel.
for newChannel := range chans {
// Channels have a type, depending on the application level
// protocol intended. In the case of an SFTP session, this is "subsystem"
// with a payload string of "<length=4>sftp"
log.Printf("Incoming channel: %s\n", newChannel.ChannelType())
if newChannel.ChannelType() != "session" {
newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
log.Printf("Unknown channel type: %s\n", newChannel.ChannelType())
continue
}
channel, requests, err := newChannel.Accept()
if err != nil {
log.Print("could not accept channel.", err)
}
log.Printf("Channel accepted\n")
// Sessions have out-of-band requests such as "shell",
// "pty-req" and "env". Here we handle only the
// "subsystem" request.
go func(in <-chan *ssh.Request) {
for req := range in {
log.Printf("Request: %v\n", req.Type)
ok := false
switch req.Type {
case "subsystem":
log.Printf("Subsystem: %s\n", req.Payload[4:])
if string(req.Payload[4:]) == "sftp" {
ok = true
}
}
log.Printf(" - accepted: %v\n", ok)
req.Reply(ok, nil)
}
}(requests)
creds := keychain[user]
mc, err := minio.New(dconfig.Endpoint, &minio.Options{
Creds: credentials.NewStaticV4(creds.accessKey, creds.secretKey, ""),
Secure: dconfig.UseSSL,
})
if err != nil {
return
}
fs := s3.NewS3FS(mc)
server, err := sftp.NewServer(ctx, channel, &fs)
if err != nil {
log.Fatal(err)
}
if err := server.Serve(); err == io.EOF {
server.Close()
log.Print("sftp client exited session.")
} else if err != nil {
log.Print("sftp server completed with error:", err)
}
}
}
func httpServer(config* Config, done chan error) {
// Assemble components to handle WebDAV requests
http.Handle(config.DavPath+"/",
BasicAuthExtract{
@ -30,6 +183,8 @@ func main() {
})
if err := http.ListenAndServe(config.HttpListen, nil); err != nil {
log.Fatalf("Error with WebDAV server: %v", err)
done <- fmt.Errorf("Error with WebDAV server: %v", err)
} else {
done <- nil
}
}

86
s3_file.go → s3/file.go
View file

@ -1,4 +1,4 @@
package main
package s3
import (
"context"
@ -11,7 +11,6 @@ import (
"path"
"github.com/minio/minio-go/v7"
"golang.org/x/net/webdav"
)
type S3File struct {
@ -20,14 +19,16 @@ type S3File struct {
objw *io.PipeWriter
donew chan error
pos int64
path S3Path
entries []fs.FileInfo
Path S3Path
}
func NewS3File(s *S3FS, path string) (webdav.File, error) {
func NewS3File(s *S3FS, path string) (*S3File, error) {
f := new(S3File)
f.fs = s
f.pos = 0
f.path = NewS3Path(path)
f.entries = nil
f.Path = NewS3Path(path)
return f, nil
}
@ -62,7 +63,7 @@ func (f *S3File) Close() error {
func (f *S3File) loadObject() error {
if f.obj == nil {
obj, err := f.fs.mc.GetObject(f.fs.ctx, f.path.bucket, f.path.key, minio.GetObjectOptions{})
obj, err := f.fs.mc.GetObject(f.fs.ctx, f.Path.Bucket, f.Path.Key, minio.GetObjectOptions{})
if err != nil {
return err
}
@ -82,6 +83,19 @@ func (f *S3File) Read(p []byte) (n int, err error) {
return f.obj.Read(p)
}
func (f *S3File) ReadAt(p []byte, off int64) (n int, err error) {
if err := f.loadObject(); err != nil {
return 0, err
}
return f.obj.ReadAt(p, off)
}
func (f *S3File) WriteAt(p []byte, off int64) (n int, err error) {
return 0, errors.New("not implemented")
}
func (f *S3File) Write(p []byte) (n int, err error) {
/*if f.path.class != OBJECT {
return 0, os.ErrInvalid
@ -96,7 +110,7 @@ func (f *S3File) Write(p []byte) (n int, err error) {
f.donew = make(chan error, 1)
f.objw = w
contentType := mime.TypeByExtension(path.Ext(f.path.key))
contentType := mime.TypeByExtension(path.Ext(f.Path.Key))
go func() {
/* @FIXME
PutObject has a strange behaviour when used with unknown size, it supposes the final size will be 5TiB.
@ -107,7 +121,7 @@ func (f *S3File) Write(p []byte) (n int, err error) {
Because Multipart uploads seems to be limited to 10 000 parts, it might be possible that we are limited to 50 GiB files, which is still good enough.
Ref: https://github.com/minio/minio-go/blob/62beca8cd87e9960d88793320220ad2c159bb5e5/api-put-object-common.go#L110-L112
*/
_, err := f.fs.mc.PutObject(context.Background(), f.path.bucket, f.path.key, r, -1, minio.PutObjectOptions{ContentType: contentType, PartSize: 5*1024*1024})
_, err := f.fs.mc.PutObject(context.Background(), f.Path.Bucket, f.Path.Key, r, -1, minio.PutObjectOptions{ContentType: contentType, PartSize: 5*1024*1024})
f.donew <- err
}()
}
@ -133,43 +147,59 @@ If n > 0, ReadDir returns at most n DirEntry records. In this case, if ReadDir r
If n <= 0, ReadDir returns all the DirEntry records remaining in the directory. When it succeeds, it returns a nil error (not io.EOF).
*/
func (f *S3File) Readdir(count int) ([]fs.FileInfo, error) {
if count > 0 {
return nil, errors.New("returning a limited number of directory entry is not supported in readdir")
}
if f.path.class == ROOT {
if f.Path.Class == ROOT {
return f.readDirRoot(count)
} else {
return f.readDirChild(count)
}
}
func (f *S3File) readDirRoot(count int) ([]fs.FileInfo, error) {
buckets, err := f.fs.mc.ListBuckets(f.fs.ctx)
if err != nil {
return nil, err
}
func min(a, b int64) int64 {
if a < b {
return a
}
return b
}
entries := make([]fs.FileInfo, 0, len(buckets))
for _, bucket := range buckets {
//log.Println("Stat from GarageFile.readDirRoot()", "/"+bucket.Name)
nf, err := NewS3Stat(f.fs, "/"+bucket.Name)
func (f *S3File) readDirRoot(count int) ([]fs.FileInfo, error) {
var err error
if f.entries == nil {
buckets, err := f.fs.mc.ListBuckets(f.fs.ctx)
if err != nil {
return nil, err
}
entries = append(entries, nf)
f.entries = make([]fs.FileInfo, 0, len(buckets))
for _, bucket := range buckets {
//log.Println("Stat from GarageFile.readDirRoot()", "/"+bucket.Name)
nf, err := NewS3Stat(f.fs, "/"+bucket.Name)
if err != nil {
return nil, err
}
f.entries = append(f.entries, nf)
}
}
beg := f.pos
end := int64(len(f.entries))
if count > 0 {
end = min(beg + int64(count), end)
}
f.pos = end
if end - beg == 0 {
err = io.EOF
}
return entries, nil
return f.entries[beg:end], err
}
func (f *S3File) readDirChild(count int) ([]fs.FileInfo, error) {
prefix := f.path.key
prefix := f.Path.Key
if len(prefix) > 0 && prefix[len(prefix)-1:] != "/" {
prefix = prefix + "/"
}
objs_info := f.fs.mc.ListObjects(f.fs.ctx, f.path.bucket, minio.ListObjectsOptions{
objs_info := f.fs.mc.ListObjects(f.fs.ctx, f.Path.Bucket, minio.ListObjectsOptions{
Prefix: prefix,
Recursive: false,
})
@ -180,7 +210,7 @@ func (f *S3File) readDirChild(count int) ([]fs.FileInfo, error) {
return nil, object.Err
}
//log.Println("Stat from GarageFile.readDirChild()", path.Join("/", f.path.bucket, object.Key))
nf, err := NewS3StatFromObjectInfo(f.fs, f.path.bucket, object)
nf, err := NewS3StatFromObjectInfo(f.fs, f.Path.Bucket, object)
if err != nil {
return nil, err
}
@ -191,5 +221,5 @@ func (f *S3File) readDirChild(count int) ([]fs.FileInfo, error) {
}
func (f *S3File) Stat() (fs.FileInfo, error) {
return NewS3Stat(f.fs, f.path.path)
return NewS3Stat(f.fs, f.Path.Path)
}

38
s3_fs.go → s3/fs.go
View file

@ -1,4 +1,4 @@
package main
package s3
import (
"context"
@ -37,9 +37,9 @@ func (s S3FS) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
p := NewS3Path(name)
if p.class == ROOT {
if p.Class == ROOT {
return errors.New("Unable to create another root folder")
} else if p.class == BUCKET {
} else if p.Class == BUCKET {
log.Println("Creating bucket is not implemented yet")
return nil
}
@ -54,7 +54,7 @@ func (s S3FS) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
return nil
}
func (s S3FS) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
func (s S3FS) OpenFile2(ctx context.Context, name string, flag int, perm os.FileMode) (*S3File, error) {
s.ctx = ctx
// If the file does not exist when opening it, we create a stub
@ -62,8 +62,8 @@ func (s S3FS) OpenFile(ctx context.Context, name string, flag int, perm os.FileM
st := new(S3Stat)
st.fs = &s
st.path = NewS3Path(name)
st.path.class = OBJECT
st.obj.Key = st.path.key
st.path.Class = OBJECT
st.obj.Key = st.path.Key
st.obj.LastModified = time.Now()
s.cache[name] = st
}
@ -71,20 +71,24 @@ func (s S3FS) OpenFile(ctx context.Context, name string, flag int, perm os.FileM
return NewS3File(&s, name)
}
func (s S3FS) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
return s.OpenFile2(ctx, name, flag, perm)
}
func (s S3FS) RemoveAll(ctx context.Context, name string) error {
//@FIXME nautilus deletes files one by one, at the end, it does not find its folder as it is "already deleted"
s.ctx = ctx
p := NewS3Path(name)
if p.class == ROOT {
if p.Class == ROOT {
return errors.New("Unable to create another root folder")
} else if p.class == BUCKET {
} else if p.Class == BUCKET {
log.Println("Deleting bucket is not implemented yet")
return nil
}
objCh := s.mc.ListObjects(s.ctx, p.bucket, minio.ListObjectsOptions{Prefix: p.key, Recursive: true})
rmCh := s.mc.RemoveObjects(s.ctx, p.bucket, objCh, minio.RemoveObjectsOptions{})
objCh := s.mc.ListObjects(s.ctx, p.Bucket, minio.ListObjectsOptions{Prefix: p.Key, Recursive: true})
rmCh := s.mc.RemoveObjects(s.ctx, p.Bucket, objCh, minio.RemoveObjectsOptions{})
for rErr := range rmCh {
return rErr.Err
@ -98,9 +102,9 @@ func (s S3FS) Rename(ctx context.Context, oldName, newName string) error {
po := NewS3Path(oldName)
pn := NewS3Path(newName)
if po.class == ROOT || pn.class == ROOT {
if po.Class == ROOT || pn.Class == ROOT {
return errors.New("Unable to rename root folder")
} else if po.class == BUCKET || pn.class == BUCKET {
} else if po.Class == BUCKET || pn.Class == BUCKET {
log.Println("Moving a bucket is not implemented yet")
return nil
}
@ -111,16 +115,16 @@ func (s S3FS) Rename(ctx context.Context, oldName, newName string) error {
}
//Gather all keys, copy the object, delete the original
objCh := s.mc.ListObjects(s.ctx, po.bucket, minio.ListObjectsOptions{Prefix: po.key, Recursive: true})
objCh := s.mc.ListObjects(s.ctx, po.Bucket, minio.ListObjectsOptions{Prefix: po.Key, Recursive: true})
for obj := range objCh {
src := minio.CopySrcOptions{
Bucket: po.bucket,
Bucket: po.Bucket,
Object: obj.Key,
}
dst := minio.CopyDestOptions{
Bucket: pn.bucket,
Object: path.Join(pn.key, obj.Key[len(po.key):]),
Bucket: pn.Bucket,
Object: path.Join(pn.Key, obj.Key[len(po.Key):]),
}
_, err := s.mc.CopyObject(s.ctx, dst, src)
@ -128,7 +132,7 @@ func (s S3FS) Rename(ctx context.Context, oldName, newName string) error {
return err
}
err = s.mc.RemoveObject(s.ctx, po.bucket, obj.Key, minio.RemoveObjectOptions{})
err = s.mc.RemoveObject(s.ctx, po.Bucket, obj.Key, minio.RemoveObjectOptions{})
var e minio.ErrorResponse
log.Println(errors.As(err, &e))
log.Println(e)

68
s3/path.go Normal file
View file

@ -0,0 +1,68 @@
package s3
import (
"path"
"strings"
"github.com/minio/minio-go/v7"
)
type S3Class int
const (
ROOT S3Class = 1 << iota
BUCKET
COMMON_PREFIX
OBJECT
OPAQUE_KEY
KEY = COMMON_PREFIX | OBJECT | OPAQUE_KEY
)
type S3Path struct {
Path string
Class S3Class
Bucket string
Key string
}
func NewS3Path(p string) S3Path {
// Remove first dot, eq. relative directory == "/"
if len(p) > 0 && p[0] == '.' {
p = p[1:]
}
// Add the first slash if missing
p = "/" + p
// Clean path using golang tools
p = path.Clean(p)
exploded_path := strings.SplitN(p, "/", 3)
// If there is no bucket name (eg. "/")
if len(exploded_path) < 2 || exploded_path[1] == "" {
return S3Path{p, ROOT, "", ""}
}
// If there is no key
if len(exploded_path) < 3 || exploded_path[2] == "" {
return S3Path{p, BUCKET, exploded_path[1], ""}
}
return S3Path{p, OPAQUE_KEY, exploded_path[1], exploded_path[2]}
}
func NewTrustedS3Path(bucket string, obj minio.ObjectInfo) S3Path {
cl := OBJECT
if obj.Key[len(obj.Key)-1:] == "/" {
cl = COMMON_PREFIX
}
return S3Path{
Path: path.Join("/", bucket, obj.Key),
Bucket: bucket,
Key: obj.Key,
Class: cl,
}
}

28
s3_stat.go → s3/stat.go
View file

@ -1,4 +1,4 @@
package main
package s3
import (
"errors"
@ -24,7 +24,7 @@ func NewS3StatFromObjectInfo(fs *S3FS, bucket string, obj minio.ObjectInfo) (*S3
s.obj = obj
s.fs = fs
fs.cache[s.path.path] = s
fs.cache[s.path.Path] = s
return s, nil
}
@ -44,30 +44,30 @@ func NewS3Stat(fs *S3FS, path string) (*S3Stat, error) {
return nil, err
}
if s.path.class&OPAQUE_KEY != 0 {
if s.path.Class&OPAQUE_KEY != 0 {
return nil, errors.New("Failed to precisely determine the key type, this a logic error.")
}
cache[path] = s
cache[s.path.path] = s
cache[s.path.Path] = s
return s, nil
}
func (s *S3Stat) Refresh() error {
if s.path.class == ROOT || s.path.class == BUCKET {
if s.path.Class == ROOT || s.path.Class == BUCKET {
return nil
}
mc := s.fs.mc
// Compute the prefix to have the desired behaviour for our stat logic
prefix := s.path.key
prefix := s.path.Key
if prefix[len(prefix)-1:] == "/" {
prefix = prefix[:len(prefix)-1]
}
// Get info and check if the key exists
objs_info := mc.ListObjects(s.fs.ctx, s.path.bucket, minio.ListObjectsOptions{
objs_info := mc.ListObjects(s.fs.ctx, s.path.Bucket, minio.ListObjectsOptions{
Prefix: prefix,
Recursive: false,
})
@ -80,7 +80,7 @@ func (s *S3Stat) Refresh() error {
if object.Key == prefix || object.Key == prefix+"/" {
s.obj = object
s.path = NewTrustedS3Path(s.path.bucket, object)
s.path = NewTrustedS3Path(s.path.Bucket, object)
found = true
break
}
@ -94,12 +94,12 @@ func (s *S3Stat) Refresh() error {
}
func (s *S3Stat) Name() string {
if s.path.class == ROOT {
if s.path.Class == ROOT {
return "/"
} else if s.path.class == BUCKET {
return s.path.bucket
} else if s.path.Class == BUCKET {
return s.path.Bucket
} else {
return path.Base(s.path.key)
return path.Base(s.path.Key)
}
}
@ -108,7 +108,7 @@ func (s *S3Stat) Size() int64 {
}
func (s *S3Stat) Mode() fs.FileMode {
if s.path.class == OBJECT {
if s.path.Class == OBJECT {
return fs.ModePerm
} else {
return fs.ModeDir | fs.ModePerm
@ -120,7 +120,7 @@ func (s *S3Stat) ModTime() time.Time {
}
func (s *S3Stat) IsDir() bool {
return s.path.class != OBJECT
return s.path.Class != OBJECT
}
func (s *S3Stat) Sys() interface{} {

57
s3_path.go
View file

@ -1,57 +0,0 @@
package main
import (
"path"
"strings"
"github.com/minio/minio-go/v7"
)
type S3Class int
const (
ROOT S3Class = 1 << iota
BUCKET
COMMON_PREFIX
OBJECT
OPAQUE_KEY
KEY = COMMON_PREFIX | OBJECT | OPAQUE_KEY
)
type S3Path struct {
path string
class S3Class
bucket string
key string
}
func NewS3Path(path string) S3Path {
exploded_path := strings.SplitN(path, "/", 3)
// If there is no bucket name (eg. "/")
if len(exploded_path) < 2 || exploded_path[1] == "" {
return S3Path{path, ROOT, "", ""}
}
// If there is no key
if len(exploded_path) < 3 || exploded_path[2] == "" {
return S3Path{path, BUCKET, exploded_path[1], ""}
}
return S3Path{path, OPAQUE_KEY, exploded_path[1], exploded_path[2]}
}
func NewTrustedS3Path(bucket string, obj minio.ObjectInfo) S3Path {
cl := OBJECT
if obj.Key[len(obj.Key)-1:] == "/" {
cl = COMMON_PREFIX
}
return S3Path{
path: path.Join("/", bucket, obj.Key),
bucket: bucket,
key: obj.Key,
class: cl,
}
}

101
sftp/allocator.go Normal file
View file

@ -0,0 +1,101 @@
package sftp
/*
Imported from: https://github.com/pkg/sftp
*/
import (
"sync"
)
type allocator struct {
sync.Mutex
available [][]byte
// map key is the request order
used map[uint32][][]byte
}
func newAllocator() *allocator {
return &allocator{
// micro optimization: initialize available pages with an initial capacity
available: make([][]byte, 0, SftpServerWorkerCount*2),
used: make(map[uint32][][]byte),
}
}
// GetPage returns a previously allocated and unused []byte or create a new one.
// The slice have a fixed size = maxMsgLength, this value is suitable for both
// receiving new packets and reading the files to serve
func (a *allocator) GetPage(requestOrderID uint32) []byte {
a.Lock()
defer a.Unlock()
var result []byte
// get an available page and remove it from the available ones.
if len(a.available) > 0 {
truncLength := len(a.available) - 1
result = a.available[truncLength]
a.available[truncLength] = nil // clear out the internal pointer
a.available = a.available[:truncLength] // truncate the slice
}
// no preallocated slice found, just allocate a new one
if result == nil {
result = make([]byte, maxMsgLength)
}
// put result in used pages
a.used[requestOrderID] = append(a.used[requestOrderID], result)
return result
}
// ReleasePages marks unused all pages in use for the given requestID
func (a *allocator) ReleasePages(requestOrderID uint32) {
a.Lock()
defer a.Unlock()
if used := a.used[requestOrderID]; len(used) > 0 {
a.available = append(a.available, used...)
}
delete(a.used, requestOrderID)
}
// Free removes all the used and available pages.
// Call this method when the allocator is not needed anymore
func (a *allocator) Free() {
a.Lock()
defer a.Unlock()
a.available = nil
a.used = make(map[uint32][][]byte)
}
func (a *allocator) countUsedPages() int {
a.Lock()
defer a.Unlock()
num := 0
for _, p := range a.used {
num += len(p)
}
return num
}
func (a *allocator) countAvailablePages() int {
a.Lock()
defer a.Unlock()
return len(a.available)
}
func (a *allocator) isRequestOrderIDUsed(requestOrderID uint32) bool {
a.Lock()
defer a.Unlock()
_, ok := a.used[requestOrderID]
return ok
}

90
sftp/attrs.go Normal file
View file

@ -0,0 +1,90 @@
package sftp
// ssh_FXP_ATTRS support
// see http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02#section-5
import (
"os"
"time"
)
const (
sshFileXferAttrSize = 0x00000001
sshFileXferAttrUIDGID = 0x00000002
sshFileXferAttrPermissions = 0x00000004
sshFileXferAttrACmodTime = 0x00000008
sshFileXferAttrExtended = 0x80000000
sshFileXferAttrAll = sshFileXferAttrSize | sshFileXferAttrUIDGID | sshFileXferAttrPermissions |
sshFileXferAttrACmodTime | sshFileXferAttrExtended
)
// fileInfo is an artificial type designed to satisfy os.FileInfo.
type fileInfo struct {
name string
stat *FileStat
}
// Name returns the base name of the file.
func (fi *fileInfo) Name() string { return fi.name }
// Size returns the length in bytes for regular files; system-dependent for others.
func (fi *fileInfo) Size() int64 { return int64(fi.stat.Size) }
// Mode returns file mode bits.
func (fi *fileInfo) Mode() os.FileMode { return toFileMode(fi.stat.Mode) }
// ModTime returns the last modification time of the file.
func (fi *fileInfo) ModTime() time.Time { return time.Unix(int64(fi.stat.Mtime), 0) }
// IsDir returns true if the file is a directory.
func (fi *fileInfo) IsDir() bool { return fi.Mode().IsDir() }
func (fi *fileInfo) Sys() interface{} { return fi.stat }
// FileStat holds the original unmarshalled values from a call to READDIR or
// *STAT. It is exported for the purposes of accessing the raw values via
// os.FileInfo.Sys(). It is also used server side to store the unmarshalled
// values for SetStat.
type FileStat struct {
Size uint64
Mode uint32
Mtime uint32
Atime uint32
UID uint32
GID uint32
Extended []StatExtended
}
// StatExtended contains additional, extended information for a FileStat.
type StatExtended struct {
ExtType string
ExtData string
}
func fileInfoFromStat(stat *FileStat, name string) os.FileInfo {
return &fileInfo{
name: name,
stat: stat,
}
}
func fileStatFromInfo(fi os.FileInfo) (uint32, *FileStat) {
mtime := fi.ModTime().Unix()
atime := mtime
var flags uint32 = sshFileXferAttrSize |
sshFileXferAttrPermissions |
sshFileXferAttrACmodTime
fileStat := &FileStat{
Size: uint64(fi.Size()),
Mode: fromFileMode(fi.Mode()),
Mtime: uint32(mtime),
Atime: uint32(atime),
}
// os specific file stat decoding
fileStatFromInfoOs(fi, &flags, fileStat)
return flags, fileStat
}

11
sftp/attrs_stubs.go Normal file
View file

@ -0,0 +1,11 @@
// +build plan9 windows android
package sftp
import (
"os"
)
func fileStatFromInfoOs(fi os.FileInfo, flags *uint32, fileStat *FileStat) {
// todo
}

16
sftp/attrs_unix.go Normal file
View file

@ -0,0 +1,16 @@
// +build darwin dragonfly freebsd !android,linux netbsd openbsd solaris aix js
package sftp
import (
"os"
"syscall"
)
func fileStatFromInfoOs(fi os.FileInfo, flags *uint32, fileStat *FileStat) {
if statt, ok := fi.Sys().(*syscall.Stat_t); ok {
*flags |= sshFileXferAttrUIDGID
fileStat.UID = statt.Uid
fileStat.GID = statt.Gid
}
}

1936
sftp/client.go Normal file
View file

File diff suppressed because it is too large Load diff

189
sftp/conn.go Normal file
View file

@ -0,0 +1,189 @@
package sftp
import (
"encoding"
"fmt"
"io"
"sync"
)
// conn implements a bidirectional channel on which client and server
// connections are multiplexed.
type conn struct {
io.Reader
io.WriteCloser
// this is the same allocator used in packet manager
alloc *allocator
sync.Mutex // used to serialise writes to sendPacket
}
// the orderID is used in server mode if the allocator is enabled.
// For the client mode just pass 0
func (c *conn) recvPacket(orderID uint32) (uint8, []byte, error) {
return recvPacket(c, c.alloc, orderID)
}
func (c *conn) sendPacket(m encoding.BinaryMarshaler) error {
c.Lock()
defer c.Unlock()
return sendPacket(c, m)
}
func (c *conn) Close() error {
c.Lock()
defer c.Unlock()
return c.WriteCloser.Close()
}
type clientConn struct {
conn
wg sync.WaitGroup
sync.Mutex // protects inflight
inflight map[uint32]chan<- result // outstanding requests
closed chan struct{}
err error
}
// Wait blocks until the conn has shut down, and return the error
// causing the shutdown. It can be called concurrently from multiple
// goroutines.
func (c *clientConn) Wait() error {
<-c.closed
return c.err
}
// Close closes the SFTP session.
func (c *clientConn) Close() error {
defer c.wg.Wait()
return c.conn.Close()
}
func (c *clientConn) loop() {
defer c.wg.Done()
err := c.recv()
if err != nil {
c.broadcastErr(err)
}
}
// recv continuously reads from the server and forwards responses to the
// appropriate channel.
func (c *clientConn) recv() error {
defer c.conn.Close()
for {
typ, data, err := c.recvPacket(0)
if err != nil {
return err
}
sid, _, err := unmarshalUint32Safe(data)
if err != nil {
return err
}
ch, ok := c.getChannel(sid)
if !ok {
// This is an unexpected occurrence. Send the error
// back to all listeners so that they terminate
// gracefully.
return fmt.Errorf("sid not found: %d", sid)
}
ch <- result{typ: typ, data: data}
}
}
func (c *clientConn) putChannel(ch chan<- result, sid uint32) bool {
c.Lock()
defer c.Unlock()
select {
case <-c.closed:
// already closed with broadcastErr, return error on chan.
ch <- result{err: ErrSSHFxConnectionLost}
return false
default:
}
c.inflight[sid] = ch
return true
}
func (c *clientConn) getChannel(sid uint32) (chan<- result, bool) {
c.Lock()
defer c.Unlock()
ch, ok := c.inflight[sid]
delete(c.inflight, sid)
return ch, ok
}
// result captures the result of receiving the a packet from the server
type result struct {
typ byte
data []byte
err error
}
type idmarshaler interface {
id() uint32
encoding.BinaryMarshaler
}
func (c *clientConn) sendPacket(ch chan result, p idmarshaler) (byte, []byte, error) {
if cap(ch) < 1 {
ch = make(chan result, 1)
}
c.dispatchRequest(ch, p)
s := <-ch
return s.typ, s.data, s.err
}
// dispatchRequest should ideally only be called by race-detection tests outside of this file,
// where you have to ensure two packets are in flight sequentially after each other.
func (c *clientConn) dispatchRequest(ch chan<- result, p idmarshaler) {
sid := p.id()
if !c.putChannel(ch, sid) {
// already closed.
return
}
if err := c.conn.sendPacket(p); err != nil {
if ch, ok := c.getChannel(sid); ok {
ch <- result{err: err}
}
}
}
// broadcastErr sends an error to all goroutines waiting for a response.
func (c *clientConn) broadcastErr(err error) {
c.Lock()
defer c.Unlock()
bcastRes := result{err: ErrSSHFxConnectionLost}
for sid, ch := range c.inflight {
ch <- bcastRes
// Replace the chan in inflight,
// we have hijacked this chan,
// and this guarantees always-only-once sending.
c.inflight[sid] = make(chan<- result, 1)
}
c.err = err
close(c.closed)
}
type serverConn struct {
conn
}
func (s *serverConn) sendError(id uint32, err error) error {
return s.sendPacket(statusFromError(id, err))
}

9
sftp/debug.go Normal file
View file

@ -0,0 +1,9 @@
// +build debug
package sftp
import "log"
func debug(fmt string, args ...interface{}) {
log.Printf(fmt, args...)
}

81
sftp/ls_formatting.go Normal file
View file

@ -0,0 +1,81 @@
package sftp
import (
"errors"
"fmt"
"os"
"os/user"
"strconv"
"time"
sshfx "git.deuxfleurs.fr/Deuxfleurs/bagage/internal/encoding/ssh/filexfer"
)
func lsFormatID(id uint32) string {
return strconv.FormatUint(uint64(id), 10)
}
type osIDLookup struct{}
func (osIDLookup) Filelist(*Request) (ListerAt, error) {
return nil, errors.New("unimplemented stub")
}
func (osIDLookup) LookupUserName(uid string) string {
u, err := user.LookupId(uid)
if err != nil {
return uid
}
return u.Username
}
func (osIDLookup) LookupGroupName(gid string) string {
g, err := user.LookupGroupId(gid)
if err != nil {
return gid
}
return g.Name
}
// runLs formats the FileInfo as per `ls -l` style, which is in the 'longname' field of a SSH_FXP_NAME entry.
// This is a fairly simple implementation, just enough to look close to openssh in simple cases.
func runLs(idLookup NameLookupFileLister, dirent os.FileInfo) string {
// example from openssh sftp server:
// crw-rw-rw- 1 root wheel 0 Jul 31 20:52 ttyvd
// format:
// {directory / char device / etc}{rwxrwxrwx} {number of links} owner group size month day [time (this year) | year (otherwise)] name
symPerms := sshfx.FileMode(fromFileMode(dirent.Mode())).String()
var numLinks uint64 = 1
uid, gid := "0", "0"
switch sys := dirent.Sys().(type) {
case *sshfx.Attributes:
uid = lsFormatID(sys.UID)
gid = lsFormatID(sys.GID)
case *FileStat:
uid = lsFormatID(sys.UID)
gid = lsFormatID(sys.GID)
default:
numLinks, uid, gid = lsLinksUIDGID(dirent)
}
if idLookup != nil {
uid, gid = idLookup.LookupUserName(uid), idLookup.LookupGroupName(gid)
}
mtime := dirent.ModTime()
date := mtime.Format("Jan 2")
var yearOrTime string
if mtime.Before(time.Now().AddDate(0, -6, 0)) {
yearOrTime = mtime.Format("2006")
} else {
yearOrTime = mtime.Format("15:04")
}
return fmt.Sprintf("%s %4d %-8s %-8s %8d %s %5s %s", symPerms, numLinks, uid, gid, dirent.Size(), date, yearOrTime, dirent.Name())
}

21
sftp/ls_plan9.go Normal file
View file

@ -0,0 +1,21 @@
// +build plan9
package sftp
import (
"os"
"syscall"
)
func lsLinksUIDGID(fi os.FileInfo) (numLinks uint64, uid, gid string) {
numLinks = 1
uid, gid = "0", "0"
switch sys := fi.Sys().(type) {
case *syscall.Dir:
uid = sys.Uid
gid = sys.Gid
}
return numLinks, uid, gid
}

11
sftp/ls_stub.go Normal file
View file

@ -0,0 +1,11 @@
// +build windows android
package sftp
import (
"os"
)
func lsLinksUIDGID(fi os.FileInfo) (numLinks uint64, uid, gid string) {
return 1, "0", "0"
}

23
sftp/ls_unix.go Normal file
View file

@ -0,0 +1,23 @@
// +build aix darwin dragonfly freebsd !android,linux netbsd openbsd solaris js
package sftp
import (
"os"
"syscall"
)
func lsLinksUIDGID(fi os.FileInfo) (numLinks uint64, uid, gid string) {
numLinks = 1
uid, gid = "0", "0"
switch sys := fi.Sys().(type) {
case *syscall.Stat_t:
numLinks = uint64(sys.Nlink)
uid = lsFormatID(sys.Uid)
gid = lsFormatID(sys.Gid)
default:
}
return numLinks, uid, gid
}

1276
sftp/packet.go Normal file
View file

File diff suppressed because it is too large Load diff

221
sftp/packet_manager.go Normal file
View file

@ -0,0 +1,221 @@
package sftp
/*
Imported from: https://github.com/pkg/sftp
*/
import (
"encoding"
"sort"
"sync"
)
// The goal of the packetManager is to keep the outgoing packets in the same
// order as the incoming as is requires by section 7 of the RFC.
type packetManager struct {
requests chan orderedPacket
responses chan orderedPacket
fini chan struct{}
incoming orderedPackets
outgoing orderedPackets
sender packetSender // connection object
working *sync.WaitGroup
packetCount uint32
// it is not nil if the allocator is enabled
alloc *allocator
}
type packetSender interface {
sendPacket(encoding.BinaryMarshaler) error
}
func newPktMgr(sender packetSender) *packetManager {
s := &packetManager{
requests: make(chan orderedPacket, SftpServerWorkerCount),
responses: make(chan orderedPacket, SftpServerWorkerCount),
fini: make(chan struct{}),
incoming: make([]orderedPacket, 0, SftpServerWorkerCount),
outgoing: make([]orderedPacket, 0, SftpServerWorkerCount),
sender: sender,
working: &sync.WaitGroup{},
}
go s.controller()
return s
}
//// packet ordering
func (s *packetManager) newOrderID() uint32 {
s.packetCount++
return s.packetCount
}
// returns the next orderID without incrementing it.
// This is used before receiving a new packet, with the allocator enabled, to associate
// the slice allocated for the received packet with the orderID that will be used to mark
// the allocated slices for reuse once the request is served
func (s *packetManager) getNextOrderID() uint32 {
return s.packetCount + 1
}
type orderedRequest struct {
requestPacket
orderid uint32
}
func (s *packetManager) newOrderedRequest(p requestPacket) orderedRequest {
return orderedRequest{requestPacket: p, orderid: s.newOrderID()}
}
func (p orderedRequest) orderID() uint32 { return p.orderid }
func (p orderedRequest) setOrderID(oid uint32) { p.orderid = oid }
type orderedResponse struct {
responsePacket
orderid uint32
}
func (s *packetManager) newOrderedResponse(p responsePacket, id uint32,
) orderedResponse {
return orderedResponse{responsePacket: p, orderid: id}
}
func (p orderedResponse) orderID() uint32 { return p.orderid }
func (p orderedResponse) setOrderID(oid uint32) { p.orderid = oid }
type orderedPacket interface {
id() uint32
orderID() uint32
}
type orderedPackets []orderedPacket
func (o orderedPackets) Sort() {
sort.Slice(o, func(i, j int) bool {
return o[i].orderID() < o[j].orderID()
})
}
//// packet registry
// register incoming packets to be handled
func (s *packetManager) incomingPacket(pkt orderedRequest) {
s.working.Add(1)
s.requests <- pkt
}
// register outgoing packets as being ready
func (s *packetManager) readyPacket(pkt orderedResponse) {
s.responses <- pkt
s.working.Done()
}
// shut down packetManager controller
func (s *packetManager) close() {
// pause until current packets are processed
s.working.Wait()
close(s.fini)
}
// Passed a worker function, returns a channel for incoming packets.
// Keep process packet responses in the order they are received while
// maximizing throughput of file transfers.
func (s *packetManager) workerChan(runWorker func(chan orderedRequest),
) chan orderedRequest {
// multiple workers for faster read/writes
rwChan := make(chan orderedRequest, SftpServerWorkerCount)
for i := 0; i < SftpServerWorkerCount; i++ {
runWorker(rwChan)
}
// single worker to enforce sequential processing of everything else
cmdChan := make(chan orderedRequest)
runWorker(cmdChan)
pktChan := make(chan orderedRequest, SftpServerWorkerCount)
go func() {
for pkt := range pktChan {
switch pkt.requestPacket.(type) {
case *sshFxpReadPacket, *sshFxpWritePacket:
s.incomingPacket(pkt)
rwChan <- pkt
continue
case *sshFxpClosePacket:
// wait for reads/writes to finish when file is closed
// incomingPacket() call must occur after this
s.working.Wait()
}
s.incomingPacket(pkt)
// all non-RW use sequential cmdChan
cmdChan <- pkt
}
close(rwChan)
close(cmdChan)
s.close()
}()
return pktChan
}
// process packets
func (s *packetManager) controller() {
for {
select {
case pkt := <-s.requests:
debug("incoming id (oid): %v (%v)", pkt.id(), pkt.orderID())
s.incoming = append(s.incoming, pkt)
s.incoming.Sort()
case pkt := <-s.responses:
debug("outgoing id (oid): %v (%v)", pkt.id(), pkt.orderID())
s.outgoing = append(s.outgoing, pkt)
s.outgoing.Sort()
case <-s.fini:
return
}
s.maybeSendPackets()
}
}
// send as many packets as are ready
func (s *packetManager) maybeSendPackets() {
for {
if len(s.outgoing) == 0 || len(s.incoming) == 0 {
debug("break! -- outgoing: %v; incoming: %v",
len(s.outgoing), len(s.incoming))
break
}
out := s.outgoing[0]
in := s.incoming[0]
// debug("incoming: %v", ids(s.incoming))
// debug("outgoing: %v", ids(s.outgoing))
if in.orderID() == out.orderID() {
debug("Sending packet: %v", out.id())
s.sender.sendPacket(out.(encoding.BinaryMarshaler))
if s.alloc != nil {
// mark for reuse the slices allocated for this request
s.alloc.ReleasePages(in.orderID())
}
// pop off heads
copy(s.incoming, s.incoming[1:]) // shift left
s.incoming[len(s.incoming)-1] = nil // clear last
s.incoming = s.incoming[:len(s.incoming)-1] // remove last
copy(s.outgoing, s.outgoing[1:]) // shift left
s.outgoing[len(s.outgoing)-1] = nil // clear last
s.outgoing = s.outgoing[:len(s.outgoing)-1] // remove last
} else {
break
}
}
}
// func oids(o []orderedPacket) []uint32 {
// res := make([]uint32, 0, len(o))
// for _, v := range o {
// res = append(res, v.orderId())
// }
// return res
// }
// func ids(o []orderedPacket) []uint32 {
// res := make([]uint32, 0, len(o))
// for _, v := range o {
// res = append(res, v.id())
// }
// return res
// }

135
sftp/packet_typing.go Normal file
View file

@ -0,0 +1,135 @@
package sftp
import (
"encoding"
"fmt"
)
// all incoming packets
type requestPacket interface {
encoding.BinaryUnmarshaler
id() uint32
}
type responsePacket interface {
encoding.BinaryMarshaler
id() uint32
}
// interfaces to group types
type hasPath interface {
requestPacket
getPath() string
}
type hasHandle interface {
requestPacket
getHandle() string
}
type notReadOnly interface {
notReadOnly()
}
//// define types by adding methods
// hasPath
func (p *sshFxpLstatPacket) getPath() string { return p.Path }
func (p *sshFxpStatPacket) getPath() string { return p.Path }
func (p *sshFxpRmdirPacket) getPath() string { return p.Path }
func (p *sshFxpReadlinkPacket) getPath() string { return p.Path }
func (p *sshFxpRealpathPacket) getPath() string { return p.Path }
func (p *sshFxpMkdirPacket) getPath() string { return p.Path }
func (p *sshFxpSetstatPacket) getPath() string { return p.Path }
func (p *sshFxpStatvfsPacket) getPath() string { return p.Path }
func (p *sshFxpRemovePacket) getPath() string { return p.Filename }
func (p *sshFxpRenamePacket) getPath() string { return p.Oldpath }
func (p *sshFxpSymlinkPacket) getPath() string { return p.Targetpath }
func (p *sshFxpOpendirPacket) getPath() string { return p.Path }
func (p *sshFxpOpenPacket) getPath() string { return p.Path }
func (p *sshFxpExtendedPacketPosixRename) getPath() string { return p.Oldpath }
func (p *sshFxpExtendedPacketHardlink) getPath() string { return p.Oldpath }
// getHandle
func (p *sshFxpFstatPacket) getHandle() string { return p.Handle }
func (p *sshFxpFsetstatPacket) getHandle() string { return p.Handle }
func (p *sshFxpReadPacket) getHandle() string { return p.Handle }
func (p *sshFxpWritePacket) getHandle() string { return p.Handle }
func (p *sshFxpReaddirPacket) getHandle() string { return p.Handle }
func (p *sshFxpClosePacket) getHandle() string { return p.Handle }
// notReadOnly
func (p *sshFxpWritePacket) notReadOnly() {}
func (p *sshFxpSetstatPacket) notReadOnly() {}
func (p *sshFxpFsetstatPacket) notReadOnly() {}
func (p *sshFxpRemovePacket) notReadOnly() {}
func (p *sshFxpMkdirPacket) notReadOnly() {}
func (p *sshFxpRmdirPacket) notReadOnly() {}
func (p *sshFxpRenamePacket) notReadOnly() {}
func (p *sshFxpSymlinkPacket) notReadOnly() {}
func (p *sshFxpExtendedPacketPosixRename) notReadOnly() {}
func (p *sshFxpExtendedPacketHardlink) notReadOnly() {}
// some packets with ID are missing id()
func (p *sshFxpDataPacket) id() uint32 { return p.ID }
func (p *sshFxpStatusPacket) id() uint32 { return p.ID }
func (p *sshFxpStatResponse) id() uint32 { return p.ID }
func (p *sshFxpNamePacket) id() uint32 { return p.ID }
func (p *sshFxpHandlePacket) id() uint32 { return p.ID }
func (p *StatVFS) id() uint32 { return p.ID }
func (p *sshFxVersionPacket) id() uint32 { return 0 }
// take raw incoming packet data and build packet objects
func makePacket(p rxPacket) (requestPacket, error) {
var pkt requestPacket
switch p.pktType {
case sshFxpInit:
pkt = &sshFxInitPacket{}
case sshFxpLstat:
pkt = &sshFxpLstatPacket{}
case sshFxpOpen:
pkt = &sshFxpOpenPacket{}
case sshFxpClose:
pkt = &sshFxpClosePacket{}
case sshFxpRead:
pkt = &sshFxpReadPacket{}
case sshFxpWrite:
pkt = &sshFxpWritePacket{}
case sshFxpFstat:
pkt = &sshFxpFstatPacket{}
case sshFxpSetstat:
pkt = &sshFxpSetstatPacket{}
case sshFxpFsetstat:
pkt = &sshFxpFsetstatPacket{}
case sshFxpOpendir:
pkt = &sshFxpOpendirPacket{}
case sshFxpReaddir:
pkt = &sshFxpReaddirPacket{}
case sshFxpRemove:
pkt = &sshFxpRemovePacket{}
case sshFxpMkdir:
pkt = &sshFxpMkdirPacket{}
case sshFxpRmdir:
pkt = &sshFxpRmdirPacket{}
case sshFxpRealpath:
pkt = &sshFxpRealpathPacket{}
case sshFxpStat:
pkt = &sshFxpStatPacket{}
case sshFxpRename:
pkt = &sshFxpRenamePacket{}
case sshFxpReadlink:
pkt = &sshFxpReadlinkPacket{}
case sshFxpSymlink:
pkt = &sshFxpSymlinkPacket{}
case sshFxpExtended:
pkt = &sshFxpExtendedPacket{}
default:
return nil, fmt.Errorf("unhandled packet type: %s", p.pktType)
}
if err := pkt.UnmarshalBinary(p.pktBytes); err != nil {
// Return partially unpacked packet to allow callers to return
// error messages appropriately with necessary id() method.
return pkt, err
}
return pkt, nil
}

79
sftp/pool.go Normal file
View file

@ -0,0 +1,79 @@
package sftp
// bufPool provides a pool of byte-slices to be reused in various parts of the package.
// It is safe to use concurrently through a pointer.
type bufPool struct {
ch chan []byte
blen int
}
func newBufPool(depth, bufLen int) *bufPool {
return &bufPool{
ch: make(chan []byte, depth),
blen: bufLen,
}
}
func (p *bufPool) Get() []byte {
if p.blen <= 0 {
panic("bufPool: new buffer creation length must be greater than zero")
}
for {
select {
case b := <-p.ch:
if cap(b) < p.blen {
// just in case: throw away any buffer with insufficient capacity.
continue
}
return b[:p.blen]
default:
return make([]byte, p.blen)
}
}
}
func (p *bufPool) Put(b []byte) {
if p == nil {
// functional default: no reuse.
return
}
if cap(b) < p.blen || cap(b) > p.blen*2 {
// DO NOT reuse buffers with insufficient capacity.
// This could cause panics when resizing to p.blen.
// DO NOT reuse buffers with excessive capacity.
// This could cause memory leaks.
return
}
select {
case p.ch <- b:
default:
}
}
type resChanPool chan chan result
func newResChanPool(depth int) resChanPool {
return make(chan chan result, depth)
}
func (p resChanPool) Get() chan result {
select {
case ch := <-p:
return ch
default:
return make(chan result, 1)
}
}
func (p resChanPool) Put(ch chan result) {
select {
case p <- ch:
default:
}
}

5
sftp/release.go Normal file
View file

@ -0,0 +1,5 @@
// +build !debug
package sftp
func debug(fmt string, args ...interface{}) {}

63
sftp/request-attrs.go Normal file
View file

@ -0,0 +1,63 @@
package sftp
// Methods on the Request object to make working with the Flags bitmasks and
// Attr(ibutes) byte blob easier. Use Pflags() when working with an Open/Write
// request and AttrFlags() and Attributes() when working with SetStat requests.
import "os"
// FileOpenFlags defines Open and Write Flags. Correlate directly with with os.OpenFile flags
// (https://golang.org/pkg/os/#pkg-constants).
type FileOpenFlags struct {
Read, Write, Append, Creat, Trunc, Excl bool
}
func newFileOpenFlags(flags uint32) FileOpenFlags {
return FileOpenFlags{
Read: flags&sshFxfRead != 0,
Write: flags&sshFxfWrite != 0,
Append: flags&sshFxfAppend != 0,
Creat: flags&sshFxfCreat != 0,
Trunc: flags&sshFxfTrunc != 0,
Excl: flags&sshFxfExcl != 0,
}
}
// Pflags converts the bitmap/uint32 from SFTP Open packet pflag values,
// into a FileOpenFlags struct with booleans set for flags set in bitmap.
func (r *Request) Pflags() FileOpenFlags {
return newFileOpenFlags(r.Flags)
}
// FileAttrFlags that indicate whether SFTP file attributes were passed. When a flag is
// true the corresponding attribute should be available from the FileStat
// object returned by Attributes method. Used with SetStat.
type FileAttrFlags struct {
Size, UidGid, Permissions, Acmodtime bool
}
func newFileAttrFlags(flags uint32) FileAttrFlags {
return FileAttrFlags{
Size: (flags & sshFileXferAttrSize) != 0,
UidGid: (flags & sshFileXferAttrUIDGID) != 0,
Permissions: (flags & sshFileXferAttrPermissions) != 0,
Acmodtime: (flags & sshFileXferAttrACmodTime) != 0,
}
}
// AttrFlags returns a FileAttrFlags boolean struct based on the
// bitmap/uint32 file attribute flags from the SFTP packaet.
func (r *Request) AttrFlags() FileAttrFlags {
return newFileAttrFlags(r.Flags)
}
// FileMode returns the Mode SFTP file attributes wrapped as os.FileMode
func (a FileStat) FileMode() os.FileMode {
return os.FileMode(a.Mode)
}
// Attributes parses file attributes byte blob and return them in a
// FileStat object.
func (r *Request) Attributes() *FileStat {
fs, _ := unmarshalFileStat(r.Flags, r.Attrs)
return fs
}

54
sftp/request-errors.go Normal file
View file

@ -0,0 +1,54 @@
package sftp
type fxerr uint32
// Error types that match the SFTP's SSH_FXP_STATUS codes. Gives you more
// direct control of the errors being sent vs. letting the library work them
// out from the standard os/io errors.
const (
ErrSSHFxOk = fxerr(sshFxOk)
ErrSSHFxEOF = fxerr(sshFxEOF)
ErrSSHFxNoSuchFile = fxerr(sshFxNoSuchFile)
ErrSSHFxPermissionDenied = fxerr(sshFxPermissionDenied)
ErrSSHFxFailure = fxerr(sshFxFailure)
ErrSSHFxBadMessage = fxerr(sshFxBadMessage)
ErrSSHFxNoConnection = fxerr(sshFxNoConnection)
ErrSSHFxConnectionLost = fxerr(sshFxConnectionLost)
ErrSSHFxOpUnsupported = fxerr(sshFxOPUnsupported)
)
// Deprecated error types, these are aliases for the new ones, please use the new ones directly
const (
ErrSshFxOk = ErrSSHFxOk
ErrSshFxEof = ErrSSHFxEOF
ErrSshFxNoSuchFile = ErrSSHFxNoSuchFile
ErrSshFxPermissionDenied = ErrSSHFxPermissionDenied
ErrSshFxFailure = ErrSSHFxFailure
ErrSshFxBadMessage = ErrSSHFxBadMessage
ErrSshFxNoConnection = ErrSSHFxNoConnection
ErrSshFxConnectionLost = ErrSSHFxConnectionLost
ErrSshFxOpUnsupported = ErrSSHFxOpUnsupported
)
func (e fxerr) Error() string {
switch e {
case ErrSSHFxOk:
return "OK"
case ErrSSHFxEOF:
return "EOF"
case ErrSSHFxNoSuchFile:
return "no such file"
case ErrSSHFxPermissionDenied:
return "permission denied"
case ErrSSHFxBadMessage:
return "bad message"
case ErrSSHFxNoConnection:
return "no connection"
case ErrSSHFxConnectionLost:
return "connection lost"
case ErrSSHFxOpUnsupported:
return "operation unsupported"
default:
return "failure"
}
}

121
sftp/request-interfaces.go Normal file
View file

@ -0,0 +1,121 @@
package sftp
import (
"io"
"os"
)
// WriterAtReaderAt defines the interface to return when a file is to
// be opened for reading and writing
type WriterAtReaderAt interface {
io.WriterAt
io.ReaderAt
}
// Interfaces are differentiated based on required returned values.
// All input arguments are to be pulled from Request (the only arg).
// The Handler interfaces all take the Request object as its only argument.
// All the data you should need to handle the call are in the Request object.
// The request.Method attribute is initially the most important one as it
// determines which Handler gets called.
// FileReader should return an io.ReaderAt for the filepath
// Note in cases of an error, the error text will be sent to the client.
// Called for Methods: Get
type FileReader interface {
Fileread(*Request) (io.ReaderAt, error)
}
// FileWriter should return an io.WriterAt for the filepath.
//
// The request server code will call Close() on the returned io.WriterAt
// ojbect if an io.Closer type assertion succeeds.
// Note in cases of an error, the error text will be sent to the client.
// Note when receiving an Append flag it is important to not open files using
// O_APPEND if you plan to use WriteAt, as they conflict.
// Called for Methods: Put, Open
type FileWriter interface {
Filewrite(*Request) (io.WriterAt, error)
}
// OpenFileWriter is a FileWriter that implements the generic OpenFile method.
// You need to implement this optional interface if you want to be able
// to read and write from/to the same handle.
// Called for Methods: Open
type OpenFileWriter interface {
FileWriter
OpenFile(*Request) (WriterAtReaderAt, error)
}
// FileCmder should return an error
// Note in cases of an error, the error text will be sent to the client.
// Called for Methods: Setstat, Rename, Rmdir, Mkdir, Link, Symlink, Remove
type FileCmder interface {
Filecmd(*Request) error
}
// PosixRenameFileCmder is a FileCmder that implements the PosixRename method.
// If this interface is implemented PosixRename requests will call it
// otherwise they will be handled in the same way as Rename
type PosixRenameFileCmder interface {
FileCmder
PosixRename(*Request) error
}
// StatVFSFileCmder is a FileCmder that implements the StatVFS method.
// You need to implement this interface if you want to handle statvfs requests.
// Please also be sure that the statvfs@openssh.com extension is enabled
type StatVFSFileCmder interface {
FileCmder
StatVFS(*Request) (*StatVFS, error)
}
// FileLister should return an object that fulfils the ListerAt interface
// Note in cases of an error, the error text will be sent to the client.
// Called for Methods: List, Stat, Readlink
type FileLister interface {
Filelist(*Request) (ListerAt, error)
}
// LstatFileLister is a FileLister that implements the Lstat method.
// If this interface is implemented Lstat requests will call it
// otherwise they will be handled in the same way as Stat
type LstatFileLister interface {
FileLister
Lstat(*Request) (ListerAt, error)
}
// RealPathFileLister is a FileLister that implements the Realpath method.
// We use "/" as start directory for relative paths, implementing this
// interface you can customize the start directory.
// You have to return an absolute POSIX path.
type RealPathFileLister interface {
FileLister
RealPath(string) string
}
// NameLookupFileLister is a FileLister that implmeents the LookupUsername and LookupGroupName methods.
// If this interface is implemented, then longname ls formatting will use these to convert usernames and groupnames.
type NameLookupFileLister interface {
FileLister
LookupUserName(string) string
LookupGroupName(string) string
}
// ListerAt does for file lists what io.ReaderAt does for files.
// ListAt should return the number of entries copied and an io.EOF
// error if at end of list. This is testable by comparing how many you
// copied to how many could be copied (eg. n < len(ls) below).
// The copy() builtin is best for the copying.
// Note in cases of an error, the error text will be sent to the client.
type ListerAt interface {
ListAt([]os.FileInfo, int64) (int, error)
}
// TransferError is an optional interface that readerAt and writerAt
// can implement to be notified about the error causing Serve() to exit
// with the request still open
type TransferError interface {
TransferError(err error)
}

34
sftp/request-plan9.go Normal file
View file

@ -0,0 +1,34 @@
// +build plan9
package sftp
import (
"path"
"path/filepath"
"syscall"
)
func fakeFileInfoSys() interface{} {
return &syscall.Dir{}
}
func testOsSys(sys interface{}) error {
return nil
}
func toLocalPath(p string) string {
lp := filepath.FromSlash(p)
if path.IsAbs(p) {
tmp := lp[1:]
if filepath.IsAbs(tmp) {
// If the FromSlash without any starting slashes is absolute,
// then we have a filepath encoded with a prefix '/'.
// e.g. "/#s/boot" to "#s/boot"
return tmp
}
}
return lp
}

304
sftp/request-server.go Normal file
View file

@ -0,0 +1,304 @@
package sftp
import (
"context"
"errors"
"io"
"path"
"path/filepath"
"strconv"
"sync"
)
var maxTxPacket uint32 = 1 << 15
// Handlers contains the 4 SFTP server request handlers.
type Handlers struct {
FileGet FileReader
FilePut FileWriter
FileCmd FileCmder
FileList FileLister
}
// RequestServer abstracts the sftp protocol with an http request-like protocol
type RequestServer struct {
Handlers Handlers
*serverConn
pktMgr *packetManager
mu sync.RWMutex
handleCount int
openRequests map[string]*Request
}
// A RequestServerOption is a function which applies configuration to a RequestServer.
type RequestServerOption func(*RequestServer)
// WithRSAllocator enable the allocator.
// After processing a packet we keep in memory the allocated slices
// and we reuse them for new packets.
// The allocator is experimental
func WithRSAllocator() RequestServerOption {
return func(rs *RequestServer) {
alloc := newAllocator()
rs.pktMgr.alloc = alloc
rs.conn.alloc = alloc
}
}
// NewRequestServer creates/allocates/returns new RequestServer.
// Normally there will be one server per user-session.
func NewRequestServer(rwc io.ReadWriteCloser, h Handlers, options ...RequestServerOption) *RequestServer {
svrConn := &serverConn{
conn: conn{
Reader: rwc,
WriteCloser: rwc,
},
}
rs := &RequestServer{
Handlers: h,
serverConn: svrConn,
pktMgr: newPktMgr(svrConn),
openRequests: make(map[string]*Request),
}
for _, o := range options {
o(rs)
}
return rs
}
// New Open packet/Request
func (rs *RequestServer) nextRequest(r *Request) string {
rs.mu.Lock()
defer rs.mu.Unlock()
rs.handleCount++
r.handle = strconv.Itoa(rs.handleCount)
rs.openRequests[r.handle] = r
return r.handle
}
// Returns Request from openRequests, bool is false if it is missing.
//
// The Requests in openRequests work essentially as open file descriptors that
// you can do different things with. What you are doing with it are denoted by
// the first packet of that type (read/write/etc).
func (rs *RequestServer) getRequest(handle string) (*Request, bool) {
rs.mu.RLock()
defer rs.mu.RUnlock()
r, ok := rs.openRequests[handle]
return r, ok
}
// Close the Request and clear from openRequests map
func (rs *RequestServer) closeRequest(handle string) error {
rs.mu.Lock()
defer rs.mu.Unlock()
if r, ok := rs.openRequests[handle]; ok {
delete(rs.openRequests, handle)
return r.close()
}
return EBADF
}
// Close the read/write/closer to trigger exiting the main server loop
func (rs *RequestServer) Close() error { return rs.conn.Close() }
func (rs *RequestServer) serveLoop(pktChan chan<- orderedRequest) error {
defer close(pktChan) // shuts down sftpServerWorkers
var err error
var pkt requestPacket
var pktType uint8
var pktBytes []byte
for {
pktType, pktBytes, err = rs.serverConn.recvPacket(rs.pktMgr.getNextOrderID())
if err != nil {
// we don't care about releasing allocated pages here, the server will quit and the allocator freed
return err
}
pkt, err = makePacket(rxPacket{fxp(pktType), pktBytes})
if err != nil {
switch {
case errors.Is(err, errUnknownExtendedPacket):
// do nothing
default:
debug("makePacket err: %v", err)
rs.conn.Close() // shuts down recvPacket
return err
}
}
pktChan <- rs.pktMgr.newOrderedRequest(pkt)
}
}
// Serve requests for user session
func (rs *RequestServer) Serve() error {
defer func() {
if rs.pktMgr.alloc != nil {
rs.pktMgr.alloc.Free()
}
}()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
var wg sync.WaitGroup
runWorker := func(ch chan orderedRequest) {
wg.Add(1)
go func() {
defer wg.Done()
if err := rs.packetWorker(ctx, ch); err != nil {
rs.conn.Close() // shuts down recvPacket
}
}()
}
pktChan := rs.pktMgr.workerChan(runWorker)
err := rs.serveLoop(pktChan)
wg.Wait() // wait for all workers to exit
rs.mu.Lock()
defer rs.mu.Unlock()
// make sure all open requests are properly closed
// (eg. possible on dropped connections, client crashes, etc.)
for handle, req := range rs.openRequests {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
req.transferError(err)
delete(rs.openRequests, handle)
req.close()
}
return err
}
func (rs *RequestServer) packetWorker(ctx context.Context, pktChan chan orderedRequest) error {
for pkt := range pktChan {
orderID := pkt.orderID()
if epkt, ok := pkt.requestPacket.(*sshFxpExtendedPacket); ok {
if epkt.SpecificPacket != nil {
pkt.requestPacket = epkt.SpecificPacket
}
}
var rpkt responsePacket
switch pkt := pkt.requestPacket.(type) {
case *sshFxInitPacket:
rpkt = &sshFxVersionPacket{Version: sftpProtocolVersion, Extensions: sftpExtensions}
case *sshFxpClosePacket:
handle := pkt.getHandle()
rpkt = statusFromError(pkt.ID, rs.closeRequest(handle))
case *sshFxpRealpathPacket:
var realPath string
if realPather, ok := rs.Handlers.FileList.(RealPathFileLister); ok {
realPath = realPather.RealPath(pkt.getPath())
} else {
realPath = cleanPath(pkt.getPath())
}
rpkt = cleanPacketPath(pkt, realPath)
case *sshFxpOpendirPacket:
request := requestFromPacket(ctx, pkt)
handle := rs.nextRequest(request)
rpkt = request.opendir(rs.Handlers, pkt)
if _, ok := rpkt.(*sshFxpHandlePacket); !ok {
// if we return an error we have to remove the handle from the active ones
rs.closeRequest(handle)
}
case *sshFxpOpenPacket:
request := requestFromPacket(ctx, pkt)
handle := rs.nextRequest(request)
rpkt = request.open(rs.Handlers, pkt)
if _, ok := rpkt.(*sshFxpHandlePacket); !ok {
// if we return an error we have to remove the handle from the active ones
rs.closeRequest(handle)
}
case *sshFxpFstatPacket:
handle := pkt.getHandle()
request, ok := rs.getRequest(handle)
if !ok {
rpkt = statusFromError(pkt.ID, EBADF)
} else {
request = NewRequest("Stat", request.Filepath)
rpkt = request.call(rs.Handlers, pkt, rs.pktMgr.alloc, orderID)
}
case *sshFxpFsetstatPacket:
handle := pkt.getHandle()
request, ok := rs.getRequest(handle)
if !ok {
rpkt = statusFromError(pkt.ID, EBADF)
} else {
request = NewRequest("Setstat", request.Filepath)
rpkt = request.call(rs.Handlers, pkt, rs.pktMgr.alloc, orderID)
}
case *sshFxpExtendedPacketPosixRename:
request := NewRequest("PosixRename", pkt.Oldpath)
request.Target = pkt.Newpath
rpkt = request.call(rs.Handlers, pkt, rs.pktMgr.alloc, orderID)
case *sshFxpExtendedPacketStatVFS:
request := NewRequest("StatVFS", pkt.Path)
rpkt = request.call(rs.Handlers, pkt, rs.pktMgr.alloc, orderID)
case hasHandle:
handle := pkt.getHandle()
request, ok := rs.getRequest(handle)
if !ok {
rpkt = statusFromError(pkt.id(), EBADF)
} else {
rpkt = request.call(rs.Handlers, pkt, rs.pktMgr.alloc, orderID)
}
case hasPath:
request := requestFromPacket(ctx, pkt)
rpkt = request.call(rs.Handlers, pkt, rs.pktMgr.alloc, orderID)
request.close()
default:
rpkt = statusFromError(pkt.id(), ErrSSHFxOpUnsupported)
}
rs.pktMgr.readyPacket(
rs.pktMgr.newOrderedResponse(rpkt, orderID))
}
return nil
}
// clean and return name packet for file
func cleanPacketPath(pkt *sshFxpRealpathPacket, realPath string) responsePacket {
return &sshFxpNamePacket{
ID: pkt.id(),
NameAttrs: []*sshFxpNameAttr{
{
Name: realPath,
LongName: realPath,
Attrs: emptyFileStat,
},
},
}
}
// Makes sure we have a clean POSIX (/) absolute path to work with
func cleanPath(p string) string {
return cleanPathWithBase("/", p)
}
func cleanPathWithBase(base, p string) string {
p = filepath.ToSlash(filepath.Clean(p))
if !path.IsAbs(p) {
return path.Join(base, p)
}
return p
}

27
sftp/request-unix.go Normal file
View file

@ -0,0 +1,27 @@
// +build !windows,!plan9
package sftp
import (
"errors"
"syscall"
)
func fakeFileInfoSys() interface{} {
return &syscall.Stat_t{Uid: 65534, Gid: 65534}
}
func testOsSys(sys interface{}) error {
fstat := sys.(*FileStat)
if fstat.UID != uint32(65534) {
return errors.New("Uid failed to match")
}
if fstat.GID != uint32(65534) {
return errors.New("Gid failed to match")
}
return nil
}
func toLocalPath(p string) string {
return p
}

628
sftp/request.go Normal file
View file

@ -0,0 +1,628 @@
package sftp
import (
"context"
"errors"
"fmt"
"io"
"os"
"strings"
"sync"
"syscall"
)
// MaxFilelist is the max number of files to return in a readdir batch.
var MaxFilelist int64 = 100
// state encapsulates the reader/writer/readdir from handlers.
type state struct {
mu sync.RWMutex
writerAt io.WriterAt
readerAt io.ReaderAt
writerAtReaderAt WriterAtReaderAt
listerAt ListerAt
lsoffset int64
}
// copy returns a shallow copy the state.
// This is broken out to specific fields,
// because we have to copy around the mutex in state.
func (s *state) copy() state {
s.mu.RLock()
defer s.mu.RUnlock()
return state{
writerAt: s.writerAt,
readerAt: s.readerAt,
writerAtReaderAt: s.writerAtReaderAt,
listerAt: s.listerAt,
lsoffset: s.lsoffset,
}
}
func (s *state) setReaderAt(rd io.ReaderAt) {
s.mu.Lock()
defer s.mu.Unlock()
s.readerAt = rd
}
func (s *state) getReaderAt() io.ReaderAt {
s.mu.RLock()
defer s.mu.RUnlock()
return s.readerAt
}
func (s *state) setWriterAt(rd io.WriterAt) {
s.mu.Lock()
defer s.mu.Unlock()
s.writerAt = rd
}
func (s *state) getWriterAt() io.WriterAt {
s.mu.RLock()
defer s.mu.RUnlock()
return s.writerAt
}
func (s *state) setWriterAtReaderAt(rw WriterAtReaderAt) {
s.mu.Lock()
defer s.mu.Unlock()
s.writerAtReaderAt = rw
}
func (s *state) getWriterAtReaderAt() WriterAtReaderAt {
s.mu.RLock()
defer s.mu.RUnlock()
return s.writerAtReaderAt
}
func (s *state) getAllReaderWriters() (io.ReaderAt, io.WriterAt, WriterAtReaderAt) {
s.mu.RLock()
defer s.mu.RUnlock()
return s.readerAt, s.writerAt, s.writerAtReaderAt
}
// Returns current offset for file list
func (s *state) lsNext() int64 {
s.mu.RLock()
defer s.mu.RUnlock()
return s.lsoffset
}
// Increases next offset
func (s *state) lsInc(offset int64) {
s.mu.Lock()
defer s.mu.Unlock()
s.lsoffset += offset
}
// manage file read/write state
func (s *state) setListerAt(la ListerAt) {
s.mu.Lock()
defer s.mu.Unlock()
s.listerAt = la
}
func (s *state) getListerAt() ListerAt {
s.mu.RLock()
defer s.mu.RUnlock()
return s.listerAt
}
// Request contains the data and state for the incoming service request.
type Request struct {
// Get, Put, Setstat, Stat, Rename, Remove
// Rmdir, Mkdir, List, Readlink, Link, Symlink
Method string
Filepath string
Flags uint32
Attrs []byte // convert to sub-struct
Target string // for renames and sym-links
handle string
// reader/writer/readdir from handlers
state
// context lasts duration of request
ctx context.Context
cancelCtx context.CancelFunc
}
// NewRequest creates a new Request object.
func NewRequest(method, path string) *Request {
return &Request{
Method: method,
Filepath: cleanPath(path),
}
}
// copy returns a shallow copy of existing request.
// This is broken out to specific fields,
// because we have to copy around the mutex in state.
func (r *Request) copy() *Request {
return &Request{
Method: r.Method,
Filepath: r.Filepath,
Flags: r.Flags,
Attrs: r.Attrs,
Target: r.Target,
handle: r.handle,
state: r.state.copy(),
ctx: r.ctx,
cancelCtx: r.cancelCtx,
}
}
// New Request initialized based on packet data
func requestFromPacket(ctx context.Context, pkt hasPath) *Request {
method := requestMethod(pkt)
request := NewRequest(method, pkt.getPath())
request.ctx, request.cancelCtx = context.WithCancel(ctx)
switch p := pkt.(type) {
case *sshFxpOpenPacket:
request.Flags = p.Pflags
case *sshFxpSetstatPacket:
request.Flags = p.Flags
request.Attrs = p.Attrs.([]byte)
case *sshFxpRenamePacket:
request.Target = cleanPath(p.Newpath)
case *sshFxpSymlinkPacket:
// NOTE: given a POSIX compliant signature: symlink(target, linkpath string)
// this makes Request.Target the linkpath, and Request.Filepath the target.
request.Target = cleanPath(p.Linkpath)
case *sshFxpExtendedPacketHardlink:
request.Target = cleanPath(p.Newpath)
}
return request
}
// Context returns the request's context. To change the context,
// use WithContext.
//
// The returned context is always non-nil; it defaults to the
// background context.
//
// For incoming server requests, the context is canceled when the
// request is complete or the client's connection closes.
func (r *Request) Context() context.Context {
if r.ctx != nil {
return r.ctx
}
return context.Background()
}
// WithContext returns a copy of r with its context changed to ctx.
// The provided ctx must be non-nil.
func (r *Request) WithContext(ctx context.Context) *Request {
if ctx == nil {
panic("nil context")
}
r2 := r.copy()
r2.ctx = ctx
r2.cancelCtx = nil
return r2
}
// Close reader/writer if possible
func (r *Request) close() error {
defer func() {
if r.cancelCtx != nil {
r.cancelCtx()
}
}()
rd, wr, rw := r.getAllReaderWriters()
var err error
// Close errors on a Writer are far more likely to be the important one.
// As they can be information that there was a loss of data.
if c, ok := wr.(io.Closer); ok {
if err2 := c.Close(); err == nil {
// update error if it is still nil
err = err2
}
}
if c, ok := rw.(io.Closer); ok {
if err2 := c.Close(); err == nil {
// update error if it is still nil
err = err2
r.setWriterAtReaderAt(nil)
}
}
if c, ok := rd.(io.Closer); ok {
if err2 := c.Close(); err == nil {
// update error if it is still nil
err = err2
}
}
return err
}
// Notify transfer error if any
func (r *Request) transferError(err error) {
if err == nil {
return
}
rd, wr, rw := r.getAllReaderWriters()
if t, ok := wr.(TransferError); ok {
t.TransferError(err)
}
if t, ok := rw.(TransferError); ok {
t.TransferError(err)
}
if t, ok := rd.(TransferError); ok {
t.TransferError(err)
}
}
// called from worker to handle packet/request
func (r *Request) call(handlers Handlers, pkt requestPacket, alloc *allocator, orderID uint32) responsePacket {
switch r.Method {
case "Get":
return fileget(handlers.FileGet, r, pkt, alloc, orderID)
case "Put":
return fileput(handlers.FilePut, r, pkt, alloc, orderID)
case "Open":
return fileputget(handlers.FilePut, r, pkt, alloc, orderID)
case "Setstat", "Rename", "Rmdir", "Mkdir", "Link", "Symlink", "Remove", "PosixRename", "StatVFS":
return filecmd(handlers.FileCmd, r, pkt)
case "List":
return filelist(handlers.FileList, r, pkt)
case "Stat", "Lstat", "Readlink":
return filestat(handlers.FileList, r, pkt)
default:
return statusFromError(pkt.id(), fmt.Errorf("unexpected method: %s", r.Method))
}
}
// Additional initialization for Open packets
func (r *Request) open(h Handlers, pkt requestPacket) responsePacket {
flags := r.Pflags()
id := pkt.id()
switch {
case flags.Write, flags.Append, flags.Creat, flags.Trunc:
if flags.Read {
if openFileWriter, ok := h.FilePut.(OpenFileWriter); ok {
r.Method = "Open"
rw, err := openFileWriter.OpenFile(r)
if err != nil {
return statusFromError(id, err)
}
r.setWriterAtReaderAt(rw)
return &sshFxpHandlePacket{
ID: id,
Handle: r.handle,
}
}
}
r.Method = "Put"
wr, err := h.FilePut.Filewrite(r)
if err != nil {
return statusFromError(id, err)
}
r.setWriterAt(wr)
case flags.Read:
r.Method = "Get"
rd, err := h.FileGet.Fileread(r)
if err != nil {
return statusFromError(id, err)
}
r.setReaderAt(rd)
default:
return statusFromError(id, errors.New("bad file flags"))
}
return &sshFxpHandlePacket{
ID: id,
Handle: r.handle,
}
}
func (r *Request) opendir(h Handlers, pkt requestPacket) responsePacket {
r.Method = "List"
la, err := h.FileList.Filelist(r)
if err != nil {
return statusFromError(pkt.id(), wrapPathError(r.Filepath, err))
}
r.setListerAt(la)
return &sshFxpHandlePacket{
ID: pkt.id(),
Handle: r.handle,
}
}
// wrap FileReader handler
func fileget(h FileReader, r *Request, pkt requestPacket, alloc *allocator, orderID uint32) responsePacket {
rd := r.getReaderAt()
if rd == nil {
return statusFromError(pkt.id(), errors.New("unexpected read packet"))
}
data, offset, _ := packetData(pkt, alloc, orderID)
n, err := rd.ReadAt(data, offset)
// only return EOF error if no data left to read
if err != nil && (err != io.EOF || n == 0) {
return statusFromError(pkt.id(), err)
}
return &sshFxpDataPacket{
ID: pkt.id(),
Length: uint32(n),
Data: data[:n],
}
}
// wrap FileWriter handler
func fileput(h FileWriter, r *Request, pkt requestPacket, alloc *allocator, orderID uint32) responsePacket {
wr := r.getWriterAt()
if wr == nil {
return statusFromError(pkt.id(), errors.New("unexpected write packet"))
}
data, offset, _ := packetData(pkt, alloc, orderID)
_, err := wr.WriteAt(data, offset)
return statusFromError(pkt.id(), err)
}
// wrap OpenFileWriter handler
func fileputget(h FileWriter, r *Request, pkt requestPacket, alloc *allocator, orderID uint32) responsePacket {
rw := r.getWriterAtReaderAt()
if rw == nil {
return statusFromError(pkt.id(), errors.New("unexpected write and read packet"))
}
switch p := pkt.(type) {
case *sshFxpReadPacket:
data, offset := p.getDataSlice(alloc, orderID), int64(p.Offset)
n, err := rw.ReadAt(data, offset)
// only return EOF error if no data left to read
if err != nil && (err != io.EOF || n == 0) {
return statusFromError(pkt.id(), err)
}
return &sshFxpDataPacket{
ID: pkt.id(),
Length: uint32(n),
Data: data[:n],
}
case *sshFxpWritePacket:
data, offset := p.Data, int64(p.Offset)
_, err := rw.WriteAt(data, offset)
return statusFromError(pkt.id(), err)
default:
return statusFromError(pkt.id(), errors.New("unexpected packet type for read or write"))
}
}
// file data for additional read/write packets
func packetData(p requestPacket, alloc *allocator, orderID uint32) (data []byte, offset int64, length uint32) {
switch p := p.(type) {
case *sshFxpReadPacket:
return p.getDataSlice(alloc, orderID), int64(p.Offset), p.Len
case *sshFxpWritePacket:
return p.Data, int64(p.Offset), p.Length
}
return
}
// wrap FileCmder handler
func filecmd(h FileCmder, r *Request, pkt requestPacket) responsePacket {
switch p := pkt.(type) {
case *sshFxpFsetstatPacket:
r.Flags = p.Flags
r.Attrs = p.Attrs.([]byte)
}
switch r.Method {
case "PosixRename":
if posixRenamer, ok := h.(PosixRenameFileCmder); ok {
err := posixRenamer.PosixRename(r)
return statusFromError(pkt.id(), err)
}
// PosixRenameFileCmder not implemented handle this request as a Rename
r.Method = "Rename"
err := h.Filecmd(r)
return statusFromError(pkt.id(), err)
case "StatVFS":
if statVFSCmdr, ok := h.(StatVFSFileCmder); ok {
stat, err := statVFSCmdr.StatVFS(r)
if err != nil {
return statusFromError(pkt.id(), err)
}
stat.ID = pkt.id()
return stat
}
return statusFromError(pkt.id(), ErrSSHFxOpUnsupported)
}
err := h.Filecmd(r)
return statusFromError(pkt.id(), err)
}
// wrap FileLister handler
func filelist(h FileLister, r *Request, pkt requestPacket) responsePacket {
lister := r.getListerAt()
if lister == nil {
return statusFromError(pkt.id(), errors.New("unexpected dir packet"))
}
offset := r.lsNext()
finfo := make([]os.FileInfo, MaxFilelist)
n, err := lister.ListAt(finfo, offset)
r.lsInc(int64(n))
// ignore EOF as we only return it when there are no results
finfo = finfo[:n] // avoid need for nil tests below
switch r.Method {
case "List":
if err != nil && (err != io.EOF || n == 0) {
return statusFromError(pkt.id(), err)
}
nameAttrs := make([]*sshFxpNameAttr, 0, len(finfo))
// If the type conversion fails, we get untyped `nil`,
// which is handled by not looking up any names.
idLookup, _ := h.(NameLookupFileLister)
for _, fi := range finfo {
nameAttrs = append(nameAttrs, &sshFxpNameAttr{
Name: fi.Name(),
LongName: runLs(idLookup, fi),
Attrs: []interface{}{fi},
})
}
return &sshFxpNamePacket{
ID: pkt.id(),
NameAttrs: nameAttrs,
}
default:
err = fmt.Errorf("unexpected method: %s", r.Method)
return statusFromError(pkt.id(), err)
}
}
func filestat(h FileLister, r *Request, pkt requestPacket) responsePacket {
var lister ListerAt
var err error
if r.Method == "Lstat" {
if lstatFileLister, ok := h.(LstatFileLister); ok {
lister, err = lstatFileLister.Lstat(r)
} else {
// LstatFileLister not implemented handle this request as a Stat
r.Method = "Stat"
lister, err = h.Filelist(r)
}
} else {
lister, err = h.Filelist(r)
}
if err != nil {
return statusFromError(pkt.id(), err)
}
finfo := make([]os.FileInfo, 1)
n, err := lister.ListAt(finfo, 0)
finfo = finfo[:n] // avoid need for nil tests below
switch r.Method {
case "Stat", "Lstat":
if err != nil && err != io.EOF {
return statusFromError(pkt.id(), err)
}
if n == 0 {
err = &os.PathError{
Op: strings.ToLower(r.Method),
Path: r.Filepath,
Err: syscall.ENOENT,
}
return statusFromError(pkt.id(), err)
}
return &sshFxpStatResponse{
ID: pkt.id(),
info: finfo[0],
}
case "Readlink":
if err != nil && err != io.EOF {
return statusFromError(pkt.id(), err)
}
if n == 0 {
err = &os.PathError{
Op: "readlink",
Path: r.Filepath,
Err: syscall.ENOENT,
}
return statusFromError(pkt.id(), err)
}
filename := finfo[0].Name()
return &sshFxpNamePacket{
ID: pkt.id(),
NameAttrs: []*sshFxpNameAttr{
{
Name: filename,
LongName: filename,
Attrs: emptyFileStat,
},
},
}
default:
err = fmt.Errorf("unexpected method: %s", r.Method)
return statusFromError(pkt.id(), err)
}
}
// init attributes of request object from packet data
func requestMethod(p requestPacket) (method string) {
switch p.(type) {
case *sshFxpReadPacket, *sshFxpWritePacket, *sshFxpOpenPacket:
// set in open() above
case *sshFxpOpendirPacket, *sshFxpReaddirPacket:
// set in opendir() above
case *sshFxpSetstatPacket, *sshFxpFsetstatPacket:
method = "Setstat"
case *sshFxpRenamePacket:
method = "Rename"
case *sshFxpSymlinkPacket:
method = "Symlink"
case *sshFxpRemovePacket:
method = "Remove"
case *sshFxpStatPacket, *sshFxpFstatPacket:
method = "Stat"
case *sshFxpLstatPacket:
method = "Lstat"
case *sshFxpRmdirPacket:
method = "Rmdir"
case *sshFxpReadlinkPacket:
method = "Readlink"
case *sshFxpMkdirPacket:
method = "Mkdir"
case *sshFxpExtendedPacketHardlink:
method = "Link"
}
return method
}

44
sftp/request_windows.go Normal file
View file

@ -0,0 +1,44 @@
package sftp
import (
"path"
"path/filepath"
"syscall"
)
func fakeFileInfoSys() interface{} {
return syscall.Win32FileAttributeData{}
}
func testOsSys(sys interface{}) error {
return nil
}
func toLocalPath(p string) string {
lp := filepath.FromSlash(p)
if path.IsAbs(p) {
tmp := lp
for len(tmp) > 0 && tmp[0] == '\\' {
tmp = tmp[1:]
}
if filepath.IsAbs(tmp) {
// If the FromSlash without any starting slashes is absolute,
// then we have a filepath encoded with a prefix '/'.
// e.g. "/C:/Windows" to "C:\\Windows"
return tmp
}
tmp += "\\"
if filepath.IsAbs(tmp) {
// If the FromSlash without any starting slashes but with extra end slash is absolute,
// then we have a filepath encoded with a prefix '/' and a dropped '/' at the end.
// e.g. "/C:" to "C:\\"
return tmp
}
}
return lp
}

643
sftp/server.go Normal file
View file

@ -0,0 +1,643 @@
package sftp
// sftp server counterpart
import (
"context"
"log"
"encoding"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strconv"
"sync"
"syscall"
"time"
"git.deuxfleurs.fr/Deuxfleurs/bagage/s3"
)
const (
// SftpServerWorkerCount defines the number of workers for the SFTP server
SftpServerWorkerCount = 8
)
// Server is an SSH File Transfer Protocol (sftp) server.
// This is intended to provide the sftp subsystem to an ssh server daemon.
// This implementation currently supports most of sftp server protocol version 3,
// as specified at http://tools.ietf.org/html/draft-ietf-secsh-filexfer-02
type Server struct {
*serverConn
debugStream io.Writer
readOnly bool
pktMgr *packetManager
openFiles map[string]*s3.S3File
openFilesLock sync.RWMutex
handleCount int
fs *s3.S3FS
ctx context.Context
}
func (svr *Server) nextHandle(f *s3.S3File) string {
svr.openFilesLock.Lock()
defer svr.openFilesLock.Unlock()
svr.handleCount++
handle := strconv.Itoa(svr.handleCount)
svr.openFiles[handle] = f
return handle
}
func (svr *Server) closeHandle(handle string) error {
svr.openFilesLock.Lock()
defer svr.openFilesLock.Unlock()
if f, ok := svr.openFiles[handle]; ok {
delete(svr.openFiles, handle)
return f.Close()
}
return EBADF
}
func (svr *Server) getHandle(handle string) (*s3.S3File, bool) {
svr.openFilesLock.RLock()
defer svr.openFilesLock.RUnlock()
f, ok := svr.openFiles[handle]
return f, ok
}
type serverRespondablePacket interface {
encoding.BinaryUnmarshaler
id() uint32
respond(svr *Server) responsePacket
}
// NewServer creates a new Server instance around the provided streams, serving
// content from the root of the filesystem. Optionally, ServerOption
// functions may be specified to further configure the Server.
//
// A subsequent call to Serve() is required to begin serving files over SFTP.
func NewServer(ctx context.Context, rwc io.ReadWriteCloser, fs *s3.S3FS, options ...ServerOption) (*Server, error) {
svrConn := &serverConn{
conn: conn{
Reader: rwc,
WriteCloser: rwc,
},
}
s := &Server{
serverConn: svrConn,
debugStream: ioutil.Discard,
pktMgr: newPktMgr(svrConn),
openFiles: make(map[string]*s3.S3File),
fs: fs,
ctx: ctx,
}
for _, o := range options {
if err := o(s); err != nil {
return nil, err
}
}
return s, nil
}
// A ServerOption is a function which applies configuration to a Server.
type ServerOption func(*Server) error
// WithDebug enables Server debugging output to the supplied io.Writer.
func WithDebug(w io.Writer) ServerOption {
return func(s *Server) error {
s.debugStream = w
return nil
}
}
// ReadOnly configures a Server to serve files in read-only mode.
func ReadOnly() ServerOption {
return func(s *Server) error {
s.readOnly = true
return nil
}
}
// WithAllocator enable the allocator.
// After processing a packet we keep in memory the allocated slices
// and we reuse them for new packets.
// The allocator is experimental
func WithAllocator() ServerOption {
return func(s *Server) error {
alloc := newAllocator()
s.pktMgr.alloc = alloc
s.conn.alloc = alloc
return nil
}
}
type rxPacket struct {
pktType fxp
pktBytes []byte
}
// Up to N parallel servers
func (svr *Server) sftpServerWorker(pktChan chan orderedRequest) error {
for pkt := range pktChan {
// readonly checks
readonly := true
switch pkt := pkt.requestPacket.(type) {
case notReadOnly:
readonly = false
case *sshFxpOpenPacket:
readonly = pkt.readonly()
case *sshFxpExtendedPacket:
readonly = pkt.readonly()
}
// If server is operating read-only and a write operation is requested,
// return permission denied
if !readonly && svr.readOnly {
svr.pktMgr.readyPacket(
svr.pktMgr.newOrderedResponse(statusFromError(pkt.id(), syscall.EPERM), pkt.orderID()),
)
continue
}
if err := handlePacket(svr, pkt); err != nil {
return err
}
}
return nil
}
func handlePacket(s *Server, p orderedRequest) error {
var rpkt responsePacket
orderID := p.orderID()
switch p := p.requestPacket.(type) {
case *sshFxInitPacket:
log.Println("pkt: init")
rpkt = &sshFxVersionPacket{
Version: sftpProtocolVersion,
Extensions: sftpExtensions,
}
case *sshFxpStatPacket:
log.Println("pkt: stat: ", p.Path)
// stat the requested file
info, err := os.Stat(toLocalPath(p.Path))
rpkt = &sshFxpStatResponse{
ID: p.ID,
info: info,
}
if err != nil {
rpkt = statusFromError(p.ID, err)
}
case *sshFxpLstatPacket:
log.Println("pkt: lstat: ", p.Path)
// stat the requested file
info, err := os.Lstat(toLocalPath(p.Path))
rpkt = &sshFxpStatResponse{
ID: p.ID,
info: info,
}
if err != nil {
rpkt = statusFromError(p.ID, err)
}
case *sshFxpFstatPacket:
log.Println("pkt: fstat: ", p.Handle)
f, ok := s.getHandle(p.Handle)
var err error = EBADF
var info os.FileInfo
if ok {
info, err = f.Stat()
rpkt = &sshFxpStatResponse{
ID: p.ID,
info: info,
}
}
if err != nil {
rpkt = statusFromError(p.ID, err)
}
case *sshFxpMkdirPacket:
log.Println("pkt: mkdir: ", p.Path)
err := os.Mkdir(toLocalPath(p.Path), 0755)
rpkt = statusFromError(p.ID, err)
case *sshFxpRmdirPacket:
log.Println("pkt: rmdir: ", p.Path)
err := os.Remove(toLocalPath(p.Path))
rpkt = statusFromError(p.ID, err)
case *sshFxpRemovePacket:
log.Println("pkt: rm: ", p.Filename)
err := os.Remove(toLocalPath(p.Filename))
rpkt = statusFromError(p.ID, err)
case *sshFxpRenamePacket:
log.Println("pkt: rename: ", p.Oldpath, ", ", p.Newpath)
err := os.Rename(toLocalPath(p.Oldpath), toLocalPath(p.Newpath))
rpkt = statusFromError(p.ID, err)
case *sshFxpSymlinkPacket:
log.Println("pkt: ln -s: ", p.Targetpath, ", ", p.Linkpath)
err := os.Symlink(toLocalPath(p.Targetpath), toLocalPath(p.Linkpath))
rpkt = statusFromError(p.ID, err)
case *sshFxpClosePacket:
log.Println("pkt: close handle: ", p.Handle)
rpkt = statusFromError(p.ID, s.closeHandle(p.Handle))
case *sshFxpReadlinkPacket:
log.Println("pkt: read: ", p.Path)
f, err := os.Readlink(toLocalPath(p.Path))
rpkt = &sshFxpNamePacket{
ID: p.ID,
NameAttrs: []*sshFxpNameAttr{
{
Name: f,
LongName: f,
Attrs: emptyFileStat,
},
},
}
if err != nil {
rpkt = statusFromError(p.ID, err)
}
case *sshFxpRealpathPacket:
log.Println("pkt: absolute path: ", p.Path)
f := s3.NewS3Path(p.Path).Path
rpkt = &sshFxpNamePacket{
ID: p.ID,
NameAttrs: []*sshFxpNameAttr{
{
Name: f,
LongName: f,
Attrs: emptyFileStat,
},
},
}
case *sshFxpOpendirPacket:
log.Println("pkt: open dir: ", p.Path)
p.Path = s3.NewS3Path(p.Path).Path
if stat, err := s.fs.Stat(s.ctx, p.Path); err != nil {
rpkt = statusFromError(p.ID, err)
} else if !stat.IsDir() {
rpkt = statusFromError(p.ID, &os.PathError{
Path: p.Path, Err: syscall.ENOTDIR})
} else {
rpkt = (&sshFxpOpenPacket{
ID: p.ID,
Path: p.Path,
Pflags: sshFxfRead,
}).respond(s)
}
case *sshFxpReadPacket:
log.Println("pkt: read handle: ", p.Handle)
var err error = EBADF
f, ok := s.getHandle(p.Handle)
if ok {
err = nil
data := p.getDataSlice(s.pktMgr.alloc, orderID)
n, _err := f.ReadAt(data, int64(p.Offset))
if _err != nil && (_err != io.EOF || n == 0) {
err = _err
}
rpkt = &sshFxpDataPacket{
ID: p.ID,
Length: uint32(n),
Data: data[:n],
// do not use data[:n:n] here to clamp the capacity, we allocated extra capacity above to avoid reallocations
}
}
if err != nil {
rpkt = statusFromError(p.ID, err)
}
case *sshFxpWritePacket:
log.Println("pkt: write handle: ", p.Handle, ", Offset: ", p.Offset)
f, ok := s.getHandle(p.Handle)
var err error = EBADF
if ok {
_, err = f.WriteAt(p.Data, int64(p.Offset))
}
rpkt = statusFromError(p.ID, err)
case *sshFxpExtendedPacket:
log.Println("pkt: extended packet")
if p.SpecificPacket == nil {
rpkt = statusFromError(p.ID, ErrSSHFxOpUnsupported)
} else {
rpkt = p.respond(s)
}
case serverRespondablePacket:
log.Println("pkt: respondable")
rpkt = p.respond(s)
default:
return fmt.Errorf("unexpected packet type %T", p)
}
s.pktMgr.readyPacket(s.pktMgr.newOrderedResponse(rpkt, orderID))
return nil
}
// Serve serves SFTP connections until the streams stop or the SFTP subsystem
// is stopped.
func (svr *Server) Serve() error {
defer func() {
if svr.pktMgr.alloc != nil {
svr.pktMgr.alloc.Free()
}
}()
var wg sync.WaitGroup
runWorker := func(ch chan orderedRequest) {
wg.Add(1)
go func() {
defer wg.Done()
if err := svr.sftpServerWorker(ch); err != nil {
svr.conn.Close() // shuts down recvPacket
}
}()
}
pktChan := svr.pktMgr.workerChan(runWorker)
var err error
var pkt requestPacket
var pktType uint8
var pktBytes []byte
for {
pktType, pktBytes, err = svr.serverConn.recvPacket(svr.pktMgr.getNextOrderID())
if err != nil {
// we don't care about releasing allocated pages here, the server will quit and the allocator freed
break
}
pkt, err = makePacket(rxPacket{fxp(pktType), pktBytes})
if err != nil {
switch {
case errors.Is(err, errUnknownExtendedPacket):
//if err := svr.serverConn.sendError(pkt, ErrSshFxOpUnsupported); err != nil {
// debug("failed to send err packet: %v", err)
// svr.conn.Close() // shuts down recvPacket
// break
//}
default:
debug("makePacket err: %v", err)
svr.conn.Close() // shuts down recvPacket
break
}
}
pktChan <- svr.pktMgr.newOrderedRequest(pkt)
}
close(pktChan) // shuts down sftpServerWorkers
wg.Wait() // wait for all workers to exit
// close any still-open files
for handle, file := range svr.openFiles {
fmt.Fprintf(svr.debugStream, "sftp server file with handle %q left open: %v\n", handle, file.Path.Path)
file.Close()
}
return err // error from recvPacket
}
type ider interface {
id() uint32
}
// The init packet has no ID, so we just return a zero-value ID
func (p *sshFxInitPacket) id() uint32 { return 0 }
type sshFxpStatResponse struct {
ID uint32
info os.FileInfo
}
func (p *sshFxpStatResponse) marshalPacket() ([]byte, []byte, error) {
l := 4 + 1 + 4 // uint32(length) + byte(type) + uint32(id)
b := make([]byte, 4, l)
b = append(b, sshFxpAttrs)
b = marshalUint32(b, p.ID)
var payload []byte
payload = marshalFileInfo(payload, p.info)
return b, payload, nil
}
func (p *sshFxpStatResponse) MarshalBinary() ([]byte, error) {
header, payload, err := p.marshalPacket()
return append(header, payload...), err
}
var emptyFileStat = []interface{}{uint32(0)}
func (p *sshFxpOpenPacket) readonly() bool {
return !p.hasPflags(sshFxfWrite)
}
func (p *sshFxpOpenPacket) hasPflags(flags ...uint32) bool {
for _, f := range flags {
if p.Pflags&f == 0 {
return false
}
}
return true
}
func (p *sshFxpOpenPacket) respond(svr *Server) responsePacket {
log.Println("pkt: open: ", p.Path)
var osFlags int
if p.hasPflags(sshFxfRead, sshFxfWrite) {
osFlags |= os.O_RDWR
} else if p.hasPflags(sshFxfWrite) {
osFlags |= os.O_WRONLY
} else if p.hasPflags(sshFxfRead) {
osFlags |= os.O_RDONLY
} else {
// how are they opening?
return statusFromError(p.ID, syscall.EINVAL)
}
// Don't use O_APPEND flag as it conflicts with WriteAt.
// The sshFxfAppend flag is a no-op here as the client sends the offsets.
// @FIXME these flags are currently ignored
if p.hasPflags(sshFxfCreat) {
osFlags |= os.O_CREATE
}
if p.hasPflags(sshFxfTrunc) {
osFlags |= os.O_TRUNC
}
if p.hasPflags(sshFxfExcl) {
osFlags |= os.O_EXCL
}
f, err := svr.fs.OpenFile2(svr.ctx, p.Path, osFlags, 0644)
if err != nil {
return statusFromError(p.ID, err)
}
handle := svr.nextHandle(f)
return &sshFxpHandlePacket{ID: p.ID, Handle: handle}
}
func (p *sshFxpReaddirPacket) respond(svr *Server) responsePacket {
log.Println("pkt: readdir: ", p.Handle)
f, ok := svr.getHandle(p.Handle)
if !ok {
return statusFromError(p.ID, EBADF)
}
dirents, err := f.Readdir(128)
if err != nil {
return statusFromError(p.ID, err)
}
idLookup := osIDLookup{}
ret := &sshFxpNamePacket{ID: p.ID}
for _, dirent := range dirents {
ret.NameAttrs = append(ret.NameAttrs, &sshFxpNameAttr{
Name: dirent.Name(),
LongName: runLs(idLookup, dirent),
Attrs: []interface{}{dirent},
})
}
return ret
}
func (p *sshFxpSetstatPacket) respond(svr *Server) responsePacket {
log.Println("pkt: setstat: ", p.Path)
// additional unmarshalling is required for each possibility here
b := p.Attrs.([]byte)
var err error
p.Path = toLocalPath(p.Path)
debug("setstat name \"%s\"", p.Path)
if (p.Flags & sshFileXferAttrSize) != 0 {
var size uint64
if size, b, err = unmarshalUint64Safe(b); err == nil {
err = os.Truncate(p.Path, int64(size))
}
}
if (p.Flags & sshFileXferAttrPermissions) != 0 {
var mode uint32
if mode, b, err = unmarshalUint32Safe(b); err == nil {
err = os.Chmod(p.Path, os.FileMode(mode))
}
}
if (p.Flags & sshFileXferAttrACmodTime) != 0 {
var atime uint32
var mtime uint32
if atime, b, err = unmarshalUint32Safe(b); err != nil {
} else if mtime, b, err = unmarshalUint32Safe(b); err != nil {
} else {
atimeT := time.Unix(int64(atime), 0)
mtimeT := time.Unix(int64(mtime), 0)
err = os.Chtimes(p.Path, atimeT, mtimeT)
}
}
if (p.Flags & sshFileXferAttrUIDGID) != 0 {
var uid uint32
var gid uint32
if uid, b, err = unmarshalUint32Safe(b); err != nil {
} else if gid, _, err = unmarshalUint32Safe(b); err != nil {
} else {
err = os.Chown(p.Path, int(uid), int(gid))
}
}
return statusFromError(p.ID, err)
}
func (p *sshFxpFsetstatPacket) respond(svr *Server) responsePacket {
log.Println("pkt: fsetstat: ", p.Handle)
f, ok := svr.getHandle(p.Handle)
if !ok {
return statusFromError(p.ID, EBADF)
}
// additional unmarshalling is required for each possibility here
//b := p.Attrs.([]byte)
var err error
debug("fsetstat name \"%s\"", f.Path.Path)
if (p.Flags & sshFileXferAttrSize) != 0 {
/*var size uint64
if size, b, err = unmarshalUint64Safe(b); err == nil {
err = f.Truncate(int64(size))
}*/
log.Println("WARN: changing size of the file is not supported")
}
if (p.Flags & sshFileXferAttrPermissions) != 0 {
/*var mode uint32
if mode, b, err = unmarshalUint32Safe(b); err == nil {
err = f.Chmod(os.FileMode(mode))
}*/
log.Println("WARN: chmod not supported")
}
if (p.Flags & sshFileXferAttrACmodTime) != 0 {
/*var atime uint32
var mtime uint32
if atime, b, err = unmarshalUint32Safe(b); err != nil {
} else if mtime, b, err = unmarshalUint32Safe(b); err != nil {
} else {
atimeT := time.Unix(int64(atime), 0)
mtimeT := time.Unix(int64(mtime), 0)
err = os.Chtimes(f.Name(), atimeT, mtimeT)
}*/
log.Println("WARN: chtimes not supported")
}
if (p.Flags & sshFileXferAttrUIDGID) != 0 {
/*var uid uint32
var gid uint32
if uid, b, err = unmarshalUint32Safe(b); err != nil {
} else if gid, _, err = unmarshalUint32Safe(b); err != nil {
} else {
err = f.Chown(int(uid), int(gid))
}*/
log.Println("WARN: chown not supported")
}
return statusFromError(p.ID, err)
}
func statusFromError(id uint32, err error) *sshFxpStatusPacket {
ret := &sshFxpStatusPacket{
ID: id,
StatusError: StatusError{
// sshFXOk = 0
// sshFXEOF = 1
// sshFXNoSuchFile = 2 ENOENT
// sshFXPermissionDenied = 3
// sshFXFailure = 4
// sshFXBadMessage = 5
// sshFXNoConnection = 6
// sshFXConnectionLost = 7
// sshFXOPUnsupported = 8
Code: sshFxOk,
},
}
if err == nil {
return ret
}
debug("statusFromError: error is %T %#v", err, err)
ret.StatusError.Code = sshFxFailure
ret.StatusError.msg = err.Error()
if os.IsNotExist(err) {
ret.StatusError.Code = sshFxNoSuchFile
return ret
}
if code, ok := translateSyscallError(err); ok {
ret.StatusError.Code = code
return ret
}
switch e := err.(type) {
case fxerr:
ret.StatusError.Code = uint32(e)
default:
if e == io.EOF {
ret.StatusError.Code = sshFxEOF
}
}
return ret
}

21
sftp/server_statvfs_darwin.go Normal file
View file

@ -0,0 +1,21 @@
package sftp
import (
"syscall"
)
func statvfsFromStatfst(stat *syscall.Statfs_t) (*StatVFS, error) {
return &StatVFS{
Bsize: uint64(stat.Bsize),
Frsize: uint64(stat.Bsize), // fragment size is a linux thing; use block size here
Blocks: stat.Blocks,
Bfree: stat.Bfree,
Bavail: stat.Bavail,
Files: stat.Files,
Ffree: stat.Ffree,
Favail: stat.Ffree, // not sure how to calculate Favail
Fsid: uint64(uint64(stat.Fsid.Val[1])<<32 | uint64(stat.Fsid.Val[0])), // endianness?
Flag: uint64(stat.Flags), // assuming POSIX?
Namemax: 1024, // man 2 statfs shows: #define MAXPATHLEN 1024
}, nil
}

29
sftp/server_statvfs_impl.go Normal file
View file

@ -0,0 +1,29 @@
// +build darwin linux
// fill in statvfs structure with OS specific values
// Statfs_t is different per-kernel, and only exists on some unixes (not Solaris for instance)
package sftp
import (
"syscall"
)
func (p *sshFxpExtendedPacketStatVFS) respond(svr *Server) responsePacket {
retPkt, err := getStatVFSForPath(p.Path)
if err != nil {
return statusFromError(p.ID, err)
}
retPkt.ID = p.ID
return retPkt
}
func getStatVFSForPath(name string) (*StatVFS, error) {
var stat syscall.Statfs_t
if err := syscall.Statfs(name, &stat); err != nil {
return nil, err
}
return statvfsFromStatfst(&stat)
}

22
sftp/server_statvfs_linux.go Normal file
View file

@ -0,0 +1,22 @@
// +build linux
package sftp
import (
"syscall"
)
func statvfsFromStatfst(stat *syscall.Statfs_t) (*StatVFS, error) {
return &StatVFS{
Bsize: uint64(stat.Bsize),
Frsize: uint64(stat.Frsize),
Blocks: stat.Blocks,
Bfree: stat.Bfree,
Bavail: stat.Bavail,
Files: stat.Files,
Ffree: stat.Ffree,
Favail: stat.Ffree, // not sure how to calculate Favail
Flag: uint64(stat.Flags), // assuming POSIX?
Namemax: uint64(stat.Namelen),
}, nil
}

13
sftp/server_statvfs_plan9.go Normal file
View file

@ -0,0 +1,13 @@
package sftp
import (
"syscall"
)
func (p *sshFxpExtendedPacketStatVFS) respond(svr *Server) responsePacket {
return statusFromError(p.ID, syscall.EPLAN9)
}
func getStatVFSForPath(name string) (*StatVFS, error) {
return nil, syscall.EPLAN9
}

15
sftp/server_statvfs_stubs.go Normal file
View file

@ -0,0 +1,15 @@
// +build !darwin,!linux,!plan9
package sftp
import (
"syscall"
)
func (p *sshFxpExtendedPacketStatVFS) respond(svr *Server) responsePacket {
return statusFromError(p.ID, syscall.ENOTSUP)
}
func getStatVFSForPath(name string) (*StatVFS, error) {
return nil, syscall.ENOTSUP
}

258
sftp/sftp.go Normal file
View file

@ -0,0 +1,258 @@
// Package sftp implements the SSH File Transfer Protocol as described in
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-02
package sftp
import (
"fmt"
)
const (
sshFxpInit = 1
sshFxpVersion = 2
sshFxpOpen = 3
sshFxpClose = 4
sshFxpRead = 5
sshFxpWrite = 6
sshFxpLstat = 7
sshFxpFstat = 8
sshFxpSetstat = 9
sshFxpFsetstat = 10
sshFxpOpendir = 11
sshFxpReaddir = 12
sshFxpRemove = 13
sshFxpMkdir = 14
sshFxpRmdir = 15
sshFxpRealpath = 16
sshFxpStat = 17
sshFxpRename = 18
sshFxpReadlink = 19
sshFxpSymlink = 20
sshFxpStatus = 101
sshFxpHandle = 102
sshFxpData = 103
sshFxpName = 104
sshFxpAttrs = 105
sshFxpExtended = 200
sshFxpExtendedReply = 201
)
const (
sshFxOk = 0
sshFxEOF = 1
sshFxNoSuchFile = 2
sshFxPermissionDenied = 3
sshFxFailure = 4
sshFxBadMessage = 5
sshFxNoConnection = 6
sshFxConnectionLost = 7
sshFxOPUnsupported = 8
// see draft-ietf-secsh-filexfer-13
// https://tools.ietf.org/html/draft-ietf-secsh-filexfer-13#section-9.1
sshFxInvalidHandle = 9
sshFxNoSuchPath = 10
sshFxFileAlreadyExists = 11
sshFxWriteProtect = 12
sshFxNoMedia = 13
sshFxNoSpaceOnFilesystem = 14
sshFxQuotaExceeded = 15
sshFxUnknownPrincipal = 16
sshFxLockConflict = 17
sshFxDirNotEmpty = 18
sshFxNotADirectory = 19
sshFxInvalidFilename = 20
sshFxLinkLoop = 21
sshFxCannotDelete = 22
sshFxInvalidParameter = 23
sshFxFileIsADirectory = 24
sshFxByteRangeLockConflict = 25
sshFxByteRangeLockRefused = 26
sshFxDeletePending = 27
sshFxFileCorrupt = 28
sshFxOwnerInvalid = 29
sshFxGroupInvalid = 30
sshFxNoMatchingByteRangeLock = 31
)
const (
sshFxfRead = 0x00000001
sshFxfWrite = 0x00000002
sshFxfAppend = 0x00000004
sshFxfCreat = 0x00000008
sshFxfTrunc = 0x00000010
sshFxfExcl = 0x00000020
)
var (
// supportedSFTPExtensions defines the supported extensions
supportedSFTPExtensions = []sshExtensionPair{
{"hardlink@openssh.com", "1"},
{"posix-rename@openssh.com", "1"},
{"statvfs@openssh.com", "2"},
}
sftpExtensions = supportedSFTPExtensions
)
type fxp uint8
func (f fxp) String() string {
switch f {
case sshFxpInit:
return "SSH_FXP_INIT"
case sshFxpVersion:
return "SSH_FXP_VERSION"
case sshFxpOpen:
return "SSH_FXP_OPEN"
case sshFxpClose:
return "SSH_FXP_CLOSE"
case sshFxpRead:
return "SSH_FXP_READ"
case sshFxpWrite:
return "SSH_FXP_WRITE"
case sshFxpLstat:
return "SSH_FXP_LSTAT"
case sshFxpFstat:
return "SSH_FXP_FSTAT"
case sshFxpSetstat:
return "SSH_FXP_SETSTAT"
case sshFxpFsetstat:
return "SSH_FXP_FSETSTAT"
case sshFxpOpendir:
return "SSH_FXP_OPENDIR"
case sshFxpReaddir:
return "SSH_FXP_READDIR"
case sshFxpRemove:
return "SSH_FXP_REMOVE"
case sshFxpMkdir:
return "SSH_FXP_MKDIR"
case sshFxpRmdir:
return "SSH_FXP_RMDIR"
case sshFxpRealpath:
return "SSH_FXP_REALPATH"
case sshFxpStat:
return "SSH_FXP_STAT"
case sshFxpRename:
return "SSH_FXP_RENAME"
case sshFxpReadlink:
return "SSH_FXP_READLINK"
case sshFxpSymlink:
return "SSH_FXP_SYMLINK"
case sshFxpStatus:
return "SSH_FXP_STATUS"
case sshFxpHandle:
return "SSH_FXP_HANDLE"
case sshFxpData:
return "SSH_FXP_DATA"
case sshFxpName:
return "SSH_FXP_NAME"
case sshFxpAttrs:
return "SSH_FXP_ATTRS"
case sshFxpExtended:
return "SSH_FXP_EXTENDED"
case sshFxpExtendedReply:
return "SSH_FXP_EXTENDED_REPLY"
default:
return "unknown"
}
}
type fx uint8
func (f fx) String() string {
switch f {
case sshFxOk:
return "SSH_FX_OK"
case sshFxEOF:
return "SSH_FX_EOF"
case sshFxNoSuchFile:
return "SSH_FX_NO_SUCH_FILE"
case sshFxPermissionDenied:
return "SSH_FX_PERMISSION_DENIED"
case sshFxFailure:
return "SSH_FX_FAILURE"
case sshFxBadMessage:
return "SSH_FX_BAD_MESSAGE"
case sshFxNoConnection:
return "SSH_FX_NO_CONNECTION"
case sshFxConnectionLost:
return "SSH_FX_CONNECTION_LOST"
case sshFxOPUnsupported:
return "SSH_FX_OP_UNSUPPORTED"
default:
return "unknown"
}
}
type unexpectedPacketErr struct {
want, got uint8
}
func (u *unexpectedPacketErr) Error() string {
return fmt.Sprintf("sftp: unexpected packet: want %v, got %v", fxp(u.want), fxp(u.got))
}
func unimplementedPacketErr(u uint8) error {
return fmt.Errorf("sftp: unimplemented packet type: got %v", fxp(u))
}
type unexpectedIDErr struct{ want, got uint32 }
func (u *unexpectedIDErr) Error() string {
return fmt.Sprintf("sftp: unexpected id: want %d, got %d", u.want, u.got)
}
func unimplementedSeekWhence(whence int) error {
return fmt.Errorf("sftp: unimplemented seek whence %d", whence)
}
func unexpectedCount(want, got uint32) error {
return fmt.Errorf("sftp: unexpected count: want %d, got %d", want, got)
}
type unexpectedVersionErr struct{ want, got uint32 }
func (u *unexpectedVersionErr) Error() string {
return fmt.Sprintf("sftp: unexpected server version: want %v, got %v", u.want, u.got)
}
// A StatusError is returned when an SFTP operation fails, and provides
// additional information about the failure.
type StatusError struct {
Code uint32
msg, lang string
}
func (s *StatusError) Error() string {
return fmt.Sprintf("sftp: %q (%v)", s.msg, fx(s.Code))
}
// FxCode returns the error code typed to match against the exported codes
func (s *StatusError) FxCode() fxerr {
return fxerr(s.Code)
}
func getSupportedExtensionByName(extensionName string) (sshExtensionPair, error) {
for _, supportedExtension := range supportedSFTPExtensions {
if supportedExtension.Name == extensionName {
return supportedExtension, nil
}
}
return sshExtensionPair{}, fmt.Errorf("unsupported extension: %s", extensionName)
}
// SetSFTPExtensions allows to customize the supported server extensions.
// See the variable supportedSFTPExtensions for supported extensions.
// This method accepts a slice of sshExtensionPair names for example 'hardlink@openssh.com'.
// If an invalid extension is given an error will be returned and nothing will be changed
func SetSFTPExtensions(extensions ...string) error {
tempExtensions := []sshExtensionPair{}
for _, extension := range extensions {
sftpExtension, err := getSupportedExtensionByName(extension)
if err != nil {
return err
}
tempExtensions = append(tempExtensions, sftpExtension)
}
sftpExtensions = tempExtensions
return nil
}

103
sftp/stat_plan9.go Normal file
View file

@ -0,0 +1,103 @@
package sftp
import (
"os"
"syscall"
)
var EBADF = syscall.NewError("fd out of range or not open")
func wrapPathError(filepath string, err error) error {
if errno, ok := err.(syscall.ErrorString); ok {
return &os.PathError{Path: filepath, Err: errno}
}
return err
}
// translateErrno translates a syscall error number to a SFTP error code.
func translateErrno(errno syscall.ErrorString) uint32 {
switch errno {
case "":
return sshFxOk
case syscall.ENOENT:
return sshFxNoSuchFile
case syscall.EPERM:
return sshFxPermissionDenied
}
return sshFxFailure
}
func translateSyscallError(err error) (uint32, bool) {
switch e := err.(type) {
case syscall.ErrorString:
return translateErrno(e), true
case *os.PathError:
debug("statusFromError,pathError: error is %T %#v", e.Err, e.Err)
if errno, ok := e.Err.(syscall.ErrorString); ok {
return translateErrno(errno), true
}
}
return 0, false
}
// isRegular returns true if the mode describes a regular file.
func isRegular(mode uint32) bool {
return mode&S_IFMT == syscall.S_IFREG
}
// toFileMode converts sftp filemode bits to the os.FileMode specification
func toFileMode(mode uint32) os.FileMode {
var fm = os.FileMode(mode & 0777)
switch mode & S_IFMT {
case syscall.S_IFBLK:
fm |= os.ModeDevice
case syscall.S_IFCHR:
fm |= os.ModeDevice | os.ModeCharDevice
case syscall.S_IFDIR:
fm |= os.ModeDir
case syscall.S_IFIFO:
fm |= os.ModeNamedPipe
case syscall.S_IFLNK:
fm |= os.ModeSymlink
case syscall.S_IFREG:
// nothing to do
case syscall.S_IFSOCK:
fm |= os.ModeSocket
}
return fm
}
// fromFileMode converts from the os.FileMode specification to sftp filemode bits
func fromFileMode(mode os.FileMode) uint32 {
ret := uint32(mode & os.ModePerm)
switch mode & os.ModeType {
case os.ModeDevice | os.ModeCharDevice:
ret |= syscall.S_IFCHR
case os.ModeDevice:
ret |= syscall.S_IFBLK
case os.ModeDir:
ret |= syscall.S_IFDIR
case os.ModeNamedPipe:
ret |= syscall.S_IFIFO
case os.ModeSymlink:
ret |= syscall.S_IFLNK
case 0:
ret |= syscall.S_IFREG
case os.ModeSocket:
ret |= syscall.S_IFSOCK
}
return ret
}
// Plan 9 doesn't have setuid, setgid or sticky, but a Plan 9 client should
// be able to send these bits to a POSIX server.
const (
s_ISUID = 04000
s_ISGID = 02000
s_ISVTX = 01000
)

124
sftp/stat_posix.go Normal file
View file

@ -0,0 +1,124 @@
//go:build !plan9
// +build !plan9
package sftp
import (
"os"
"syscall"
)
const EBADF = syscall.EBADF
func wrapPathError(filepath string, err error) error {
if errno, ok := err.(syscall.Errno); ok {
return &os.PathError{Path: filepath, Err: errno}
}
return err
}
// translateErrno translates a syscall error number to a SFTP error code.
func translateErrno(errno syscall.Errno) uint32 {
switch errno {
case 0:
return sshFxOk
case syscall.ENOENT:
return sshFxNoSuchFile
case syscall.EACCES, syscall.EPERM:
return sshFxPermissionDenied
}
return sshFxFailure
}
func translateSyscallError(err error) (uint32, bool) {
switch e := err.(type) {
case syscall.Errno:
return translateErrno(e), true
case *os.PathError:
debug("statusFromError,pathError: error is %T %#v", e.Err, e.Err)
if errno, ok := e.Err.(syscall.Errno); ok {
return translateErrno(errno), true
}
}
return 0, false
}
// isRegular returns true if the mode describes a regular file.
func isRegular(mode uint32) bool {
return mode&S_IFMT == syscall.S_IFREG
}
// toFileMode converts sftp filemode bits to the os.FileMode specification
func toFileMode(mode uint32) os.FileMode {
var fm = os.FileMode(mode & 0777)
switch mode & S_IFMT {
case syscall.S_IFBLK:
fm |= os.ModeDevice
case syscall.S_IFCHR:
fm |= os.ModeDevice | os.ModeCharDevice
case syscall.S_IFDIR:
fm |= os.ModeDir
case syscall.S_IFIFO:
fm |= os.ModeNamedPipe
case syscall.S_IFLNK:
fm |= os.ModeSymlink
case syscall.S_IFREG:
// nothing to do
case syscall.S_IFSOCK:
fm |= os.ModeSocket
}
if mode&syscall.S_ISUID != 0 {
fm |= os.ModeSetuid
}
if mode&syscall.S_ISGID != 0 {
fm |= os.ModeSetgid
}
if mode&syscall.S_ISVTX != 0 {
fm |= os.ModeSticky
}
return fm
}
// fromFileMode converts from the os.FileMode specification to sftp filemode bits
func fromFileMode(mode os.FileMode) uint32 {
ret := uint32(mode & os.ModePerm)
switch mode & os.ModeType {
case os.ModeDevice | os.ModeCharDevice:
ret |= syscall.S_IFCHR
case os.ModeDevice:
ret |= syscall.S_IFBLK
case os.ModeDir:
ret |= syscall.S_IFDIR
case os.ModeNamedPipe:
ret |= syscall.S_IFIFO
case os.ModeSymlink:
ret |= syscall.S_IFLNK
case 0:
ret |= syscall.S_IFREG
case os.ModeSocket:
ret |= syscall.S_IFSOCK
}
if mode&os.ModeSetuid != 0 {
ret |= syscall.S_ISUID
}
if mode&os.ModeSetgid != 0 {
ret |= syscall.S_ISGID
}
if mode&os.ModeSticky != 0 {
ret |= syscall.S_ISVTX
}
return ret
}
const (
s_ISUID = syscall.S_ISUID
s_ISGID = syscall.S_ISGID
s_ISVTX = syscall.S_ISVTX
)

9
sftp/syscall_fixed.go Normal file
View file

@ -0,0 +1,9 @@
// +build plan9 windows js,wasm
// Go defines S_IFMT on windows, plan9 and js/wasm as 0x1f000 instead of
// 0xf000. None of the the other S_IFxyz values include the "1" (in 0x1f000)
// which prevents them from matching the bitmask.
package sftp
const S_IFMT = 0xf000

8
sftp/syscall_good.go Normal file
View file

@ -0,0 +1,8 @@
// +build !plan9,!windows
// +build !js !wasm
package sftp
import "syscall"
const S_IFMT = syscall.S_IFMT

3
webdav.go
View file

@ -2,6 +2,7 @@ package main
import (
"github.com/minio/minio-go/v7"
"git.deuxfleurs.fr/Deuxfleurs/bagage/s3"
"golang.org/x/net/webdav"
"log"
"net/http"
@ -15,7 +16,7 @@ func (wd WebDav) WithMC(mc *minio.Client) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
(&webdav.Handler{
Prefix: wd.WithConfig.DavPath,
FileSystem: NewS3FS(mc),
FileSystem: s3.NewS3FS(mc),
LockSystem: webdav.NewMemLS(),
Logger: func(r *http.Request, err error) {
log.Printf("INFO: %s %s %s\n", r.RemoteAddr, r.Method, r.URL)