bottin/main.go

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package main
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// @FIXME: Proper handling of various upper/lower case combinations
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// @FIXME: Implement missing search filters (in applyFilter)
// @FIXME: Add an initial prefix to the consul key value
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import (
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"crypto/tls"
"encoding/base64"
"encoding/json"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"crypto/rand"
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"os"
"os/signal"
"syscall"
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ldap "./ldapserver"
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consul "github.com/hashicorp/consul/api"
message "github.com/vjeantet/goldap/message"
)
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const DEBUG = false
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const ATTR_USERPASSWORD = "userpassword"
const ATTR_MEMBER = "member"
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const ATTR_MEMBEROF = "memberof"
const ATTR_ENTRYUUID = "entryuuid"
const ATTR_CREATORSNAME = "creatorsname"
const ATTR_CREATETIMESTAMP = "createtimestamp"
const ATTR_MODIFIERSNAME = "modifiersname"
const ATTR_MODIFYTIMESTAMP = "modifytimestamp"
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type ConfigFile struct {
Suffix string `json:"suffix"`
Bind string `json:"bind"`
BindSecure string `json:"bind_secure"`
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ConsulHost string `json:"consul_host"`
Acl []string `json:"acl"`
TLSCertFile string `json:"tls_cert_file"`
TLSKeyFile string `json:"tls_key_file"`
TLSServerName string `json:"tls_server_name"`
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}
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type Config struct {
Suffix string
Bind string
BindSecure string
ConsulHost string
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Acl ACL
TLSConfig *tls.Config
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}
type Server struct {
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logger *log.Logger
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config Config
kv *consul.KV
}
type State struct {
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login Login
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}
type Entry map[string][]string
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var configFlag = flag.String("config", "./config.json", "Configuration file path")
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func readConfig() Config {
config_file := ConfigFile{
Bind: "0.0.0.0:389",
BindSecure: "0.0.0.0:636",
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}
bytes, err := ioutil.ReadFile(*configFlag)
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if err != nil {
panic(err)
}
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err = json.Unmarshal(bytes, &config_file)
if err != nil {
panic(err)
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}
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acl, err := ParseACL(config_file.Acl)
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if err != nil {
panic(err)
}
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ret := Config{
Suffix: config_file.Suffix,
Bind: config_file.Bind,
BindSecure: config_file.BindSecure,
ConsulHost: config_file.ConsulHost,
Acl: acl,
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}
if config_file.TLSCertFile != "" && config_file.TLSKeyFile != "" && config_file.TLSServerName != "" {
cert_txt, err := ioutil.ReadFile(config_file.TLSCertFile)
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if err != nil {
panic(err)
}
key_txt, err := ioutil.ReadFile(config_file.TLSKeyFile)
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if err != nil {
panic(err)
}
cert, err := tls.X509KeyPair(cert_txt, key_txt)
if err != nil {
panic(err)
}
ret.TLSConfig = &tls.Config{
MinVersion: tls.VersionTLS10,
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MaxVersion: tls.VersionTLS12,
Certificates: []tls.Certificate{cert},
ServerName: config_file.TLSServerName,
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}
}
return ret
}
func main() {
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flag.Parse()
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ldap.Logger = log.New(os.Stdout, "[ldapserver] ", log.LstdFlags)
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config := readConfig()
// Connect to Consul
consul_config := consul.DefaultConfig()
if config.ConsulHost != "" {
consul_config.Address = config.ConsulHost
}
consul_client, err := consul.NewClient(consul_config)
if err != nil {
panic(err)
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}
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kv := consul_client.KV()
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// Create gobottin server
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gobottin := Server{
logger: log.New(os.Stdout, "[gobottin] ", log.LstdFlags),
config: config,
kv: kv,
}
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err = gobottin.init()
if err != nil {
panic(err)
}
// Create routes
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routes := ldap.NewRouteMux()
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routes.Bind(gobottin.handleBind)
routes.Search(gobottin.handleSearch)
routes.Add(gobottin.handleAdd)
routes.Compare(gobottin.handleCompare)
routes.Delete(gobottin.handleDelete)
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routes.Modify(gobottin.handleModify)
if config.TLSConfig != nil {
routes.Extended(gobottin.handleStartTLS).
RequestName(ldap.NoticeOfStartTLS).Label("StartTLS")
}
// Create LDAP servers
var ldapServer, ldapServerSecure *ldap.Server = nil, nil
// Bind on standard LDAP port without TLS
if config.Bind != "" {
ldapServer = ldap.NewServer()
ldapServer.Handle(routes)
ldapServer.NewUserState = gobottin.newUserState
go func() {
err := ldapServer.ListenAndServe(config.Bind)
if err != nil {
panic(err)
}
}()
}
// Bind on LDAP secure port with TLS
if config.BindSecure != "" {
if config.TLSConfig != nil {
ldapServerSecure := ldap.NewServer()
ldapServerSecure.Handle(routes)
ldapServerSecure.NewUserState = gobottin.newUserState
secureConn := func(s *ldap.Server) {
s.Listener = tls.NewListener(s.Listener, config.TLSConfig)
}
go func() {
err := ldapServerSecure.ListenAndServe(config.BindSecure, secureConn)
if err != nil {
panic(err)
}
}()
} else {
fmt.Printf("Warning: no valid TLS configuration was provided, not binding on %s", config.BindSecure)
}
}
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if ldapServer == nil && ldapServerSecure == nil {
panic("Not doing anything.")
}
// When CTRL+C, SIGINT and SIGTERM signal occurs
// Then stop server gracefully
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
<-ch
close(ch)
if ldapServer != nil {
ldapServer.Stop()
}
if ldapServerSecure != nil {
ldapServerSecure.Stop()
}
}
func (server *Server) newUserState() ldap.UserState {
return &State{
login: Login{
user: "ANONYMOUS",
groups: []string{},
},
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}
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}
func (server *Server) init() error {
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path, err := dnToConsul(server.config.Suffix)
if err != nil {
return err
}
pair, _, err := server.kv.Get(path+"/attribute=objectClass", nil)
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if err != nil {
return err
}
if pair != nil {
return nil
}
base_attributes := Entry{
"objectClass": []string{"top", "dcObject", "organization"},
"structuralObjectClass": []string{"Organization"},
ATTR_CREATORSNAME: []string{server.config.Suffix},
ATTR_CREATETIMESTAMP: []string{genTimestamp()},
ATTR_ENTRYUUID: []string{genUuid()},
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}
suffix_dn, err := parseDN(server.config.Suffix)
if err != nil {
return err
}
base_attributes[suffix_dn[0].Type] = []string{suffix_dn[0].Value}
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err = server.addElements(server.config.Suffix, base_attributes)
if err != nil {
return err
}
admin_pass := make([]byte, 8)
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_, err = rand.Read(admin_pass)
if err != nil {
return err
}
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admin_pass_str := base64.RawURLEncoding.EncodeToString(admin_pass)
admin_pass_hash := SSHAEncode([]byte(admin_pass_str))
admin_dn := "cn=admin," + server.config.Suffix
admin_attributes := Entry{
"objectClass": []string{"simpleSecurityObject", "organizationalRole"},
"description": []string{"LDAP administrator"},
"cn": []string{"admin"},
"structuralObjectClass": []string{"organizationalRole"},
ATTR_USERPASSWORD: []string{admin_pass_hash},
ATTR_CREATORSNAME: []string{server.config.Suffix},
ATTR_CREATETIMESTAMP: []string{genTimestamp()},
ATTR_ENTRYUUID: []string{genUuid()},
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}
err = server.addElements(admin_dn, admin_attributes)
if err != nil {
return err
}
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server.logger.Printf(
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"It seems to be a new installation, we created a default user for you:\n\n dn: %s\n password: %s\n\nWe recommend replacing it as soon as possible.",
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admin_dn,
admin_pass_str,
)
return nil
}
func (server *Server) addElements(dn string, attrs Entry) error {
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prefix, err := dnToConsul(dn)
if err != nil {
return err
}
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for k, v := range attrs {
path := prefix + "/attribute=" + k
if len(v) == 0 {
// If we have zero values, delete associated k/v pair
_, err := server.kv.Delete(path, nil)
if err != nil {
return err
}
} else {
json, err := json.Marshal(v)
if err != nil {
return err
}
pair := &consul.KVPair{Key: path, Value: json}
_, err = server.kv.Put(pair, nil)
if err != nil {
return err
}
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}
}
return nil
}
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func (server *Server) getAttribute(dn string, attr string) ([]string, error) {
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path, err := dnToConsul(dn)
if err != nil {
return nil, err
}
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pair, _, err := server.kv.Get(path+"/attribute="+attr, nil)
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if err != nil {
return nil, err
}
if pair == nil {
return nil, nil
}
return parseValue(pair.Value)
}
func (server *Server) objectExists(dn string) (bool, error) {
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prefix, err := dnToConsul(dn)
if err != nil {
return false, err
}
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data, _, err := server.kv.List(prefix+"/", nil)
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if err != nil {
return false, err
}
return len(data) > 0, nil
}
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func (server *Server) checkSuffix(dn string, allow_extend bool) (string, error) {
suffix := server.config.Suffix
if len(dn) < len(suffix) {
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if dn != suffix[len(suffix)-len(dn):] || !allow_extend {
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return suffix, fmt.Errorf(
"Only handling stuff under DN %s", suffix)
}
return suffix, nil
} else {
if dn[len(dn)-len(suffix):] != suffix {
return suffix, fmt.Errorf(
"Only handling stuff under DN %s", suffix)
}
return dn, nil
}
}
func (server *Server) handleStartTLS(s ldap.UserState, w ldap.ResponseWriter, m *ldap.Message) {
tlsConn := tls.Server(m.Client.GetConn(), server.config.TLSConfig)
res := ldap.NewExtendedResponse(ldap.LDAPResultSuccess)
res.SetResponseName(ldap.NoticeOfStartTLS)
w.Write(res)
if err := tlsConn.Handshake(); err != nil {
log.Printf("StartTLS Handshake error %v", err)
res.SetDiagnosticMessage(fmt.Sprintf("StartTLS Handshake error : \"%s\"", err.Error()))
res.SetResultCode(ldap.LDAPResultOperationsError)
w.Write(res)
return
}
m.Client.SetConn(tlsConn)
}
func (server *Server) handleBind(s ldap.UserState, w ldap.ResponseWriter, m *ldap.Message) {
state := s.(*State)
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r := m.GetBindRequest()
result_code, err := server.handleBindInternal(state, &r)
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res := ldap.NewBindResponse(result_code)
if err != nil {
res.SetDiagnosticMessage(err.Error())
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server.logger.Printf("Failed bind for %s: %s", string(r.Name()), err.Error())
}
if result_code == ldap.LDAPResultSuccess {
server.logger.Printf("Successfully bound to %s", string(r.Name()))
} else {
server.logger.Printf("Failed to bind to %s (%s)", string(r.Name()), err)
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}
w.Write(res)
}
func (server *Server) handleBindInternal(state *State, r *message.BindRequest) (int, error) {
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// Check permissions
if !server.config.Acl.Check(&state.login, "bind", string(r.Name()), []string{}) {
return ldap.LDAPResultInsufficientAccessRights, nil
}
// Try to retrieve password and check for match
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passwd, err := server.getAttribute(string(r.Name()), ATTR_USERPASSWORD)
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if err != nil {
return ldap.LDAPResultOperationsError, err
}
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if passwd == nil {
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return ldap.LDAPResultNoSuchObject, nil
}
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for _, hash := range passwd {
valid := SSHAMatches(hash, []byte(r.AuthenticationSimple()))
if valid {
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groups, err := server.getAttribute(string(r.Name()), ATTR_MEMBEROF)
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if err != nil {
return ldap.LDAPResultOperationsError, err
}
state.login = Login{
user: string(r.Name()),
groups: groups,
}
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return ldap.LDAPResultSuccess, nil
}
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}
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return ldap.LDAPResultInvalidCredentials, nil
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}