9e4b4a0162
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Changement des imports dans les fichiers go de bottin et ldapserver. Rajout d'un fichier txt dans test-automatique pour reproduire le bug des requêtes ldap.
740 lines
18 KiB
Go
740 lines
18 KiB
Go
package message
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// Below code is largely inspired from the standard golang library encoding/asn
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// If put BEGIN / END tags in the comments to give the original library name
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import (
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// "errors"
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"fmt"
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"math/big"
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// "strconv"
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// "time"
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)
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//
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// BEGIN: encoding/asn1/common.go
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//
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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const (
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tagBoolean = 1
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tagInteger = 2
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// tagBitString = 3
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tagOctetString = 4
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// tagOID = 6
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tagEnum = 10
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// tagUTF8String = 12
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tagSequence = 16
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tagSet = 17
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// tagPrintableString = 19
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// tagT61String = 20
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// tagIA5String = 22
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// tagUTCTime = 23
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// tagGeneralizedTime = 24
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tagGeneralString = 27
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)
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var tagNames = map[int]string{
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tagBoolean: "BOOLEAN",
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tagInteger: "INTEGER",
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tagOctetString: "OCTET STRING",
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tagEnum: "ENUM",
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tagSequence: "SEQUENCE",
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tagSet: "SET",
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}
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const (
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classUniversal = 0
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classApplication = 1
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classContextSpecific = 2
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// classPrivate = 3
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)
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var classNames = map[int]string{
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classUniversal: "UNIVERSAL",
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classApplication: "APPLICATION",
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classContextSpecific: "CONTEXT SPECIFIC",
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}
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const (
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isCompound = true
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isNotCompound = false
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)
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var compoundNames = map[bool]string{
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isCompound: "COMPOUND",
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isNotCompound: "NOT COMPOUND",
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}
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type TagAndLength struct {
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Class, Tag, Length int
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IsCompound bool
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}
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//
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// END: encoding/asn1/common.go
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//
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func (t *TagAndLength) Expect(class int, tag int, isCompound bool) (err error) {
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err = t.ExpectClass(class)
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if err != nil {
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return LdapError{fmt.Sprintf("Expect: %s.", err)}
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}
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err = t.ExpectTag(tag)
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if err != nil {
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return LdapError{fmt.Sprintf("Expect: %s.", err)}
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}
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err = t.ExpectCompound(isCompound)
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if err != nil {
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return LdapError{fmt.Sprintf("Expect: %s.", err)}
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}
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return
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}
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func (t *TagAndLength) ExpectClass(class int) (err error) {
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if class != t.Class {
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err = SyntaxError{fmt.Sprintf("ExpectClass: wrong tag class: got %d (%s), expected %d (%s)", t.Class, classNames[t.Class], class, classNames[class])}
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}
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return
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}
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func (t *TagAndLength) ExpectTag(tag int) (err error) {
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if tag != t.Tag {
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err = SyntaxError{fmt.Sprintf("ExpectTag: wrong tag value: got %d (%s), expected %d (%s)", t.Tag, tagNames[t.Tag], tag, tagNames[tag])}
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}
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return
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}
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func (t *TagAndLength) ExpectCompound(isCompound bool) (err error) {
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if isCompound != t.IsCompound {
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err = SyntaxError{fmt.Sprintf("ExpectCompound: wrong tag compound: got %t (%s), expected %t (%s)", t.IsCompound, compoundNames[t.IsCompound], isCompound, compoundNames[isCompound])}
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}
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return
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}
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func ParseTagAndLength(bytes []byte, initOffset int) (ret TagAndLength, offset int, err error) {
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ret, offset, err = parseTagAndLength(bytes, initOffset)
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return
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}
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//
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// BEGIN encoding/asn1/asn1.go
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//
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package asn1 implements parsing of DER-encoded ASN.1 data structures,
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// as defined in ITU-T Rec X.690.
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//
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// See also ``A Layman's Guide to a Subset of ASN.1, BER, and DER,''
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// http://luca.ntop.org/Teaching/Appunti/asn1.html.
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// package asn1
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// ASN.1 is a syntax for specifying abstract objects and BER, DER, PER, XER etc
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// are different encoding formats for those objects. Here, we'll be dealing
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// with DER, the Distinguished Encoding Rules. DER is used in X.509 because
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// it's fast to parse and, unlike BER, has a unique encoding for every object.
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// When calculating hashes over objects, it's important that the resulting
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// bytes be the same at both ends and DER removes this margin of error.
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//
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// ASN.1 is very complex and this package doesn't attempt to implement
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// everything by any means.
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//import (
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// "fmt"
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// "math/big"
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// "reflect"
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// "strconv"
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// "time"
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//)
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// A StructuralError suggests that the ASN.1 data is valid, but the Go type
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// which is receiving it doesn't match.
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type StructuralError struct {
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Msg string
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}
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func (e StructuralError) Error() string { return "asn1: structure error: " + e.Msg }
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// A SyntaxError suggests that the ASN.1 data is invalid.
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type SyntaxError struct {
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Msg string
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}
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func (e SyntaxError) Error() string { return "asn1: syntax error: " + e.Msg }
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// We start by dealing with each of the primitive types in turn.
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// BOOLEAN
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func parseBool(bytes []byte) (ret bool, err error) {
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if len(bytes) > 1 {
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err = SyntaxError{"invalid boolean: should be encoded on one byte only"}
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return
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} else if len(bytes) == 0 {
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err = SyntaxError{"invalid boolean: no data to read"}
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}
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// DER demands that "If the encoding represents the boolean value TRUE,
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// its single contents octet shall have all eight bits set to one."
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// Thus only 0 and 255 are valid encoded values.
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switch bytes[0] {
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case 0:
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ret = false
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case 0xff:
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ret = true
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default:
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err = SyntaxError{"invalid boolean: should be 0x00 of 0xFF"}
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}
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return
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}
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func sizeBool(b bool) int {
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return 1
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}
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func writeBool(bytes *Bytes, b bool) int {
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if b == false {
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return bytes.writeBytes([]byte{0x00})
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} else {
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return bytes.writeBytes([]byte{0xff})
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}
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}
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// INTEGER
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// parseInt64 treats the given bytes as a big-endian, signed integer and
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// returns the result.
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func parseInt64(bytes []byte) (ret int64, err error) {
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if len(bytes) > 8 {
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// We'll overflow an int64 in this case.
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err = StructuralError{"integer too large"}
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return
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}
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for bytesRead := 0; bytesRead < len(bytes); bytesRead++ {
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ret <<= 8
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ret |= int64(bytes[bytesRead])
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}
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// Shift up and down in order to sign extend the result.
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ret <<= 64 - uint8(len(bytes))*8
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ret >>= 64 - uint8(len(bytes))*8
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return
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}
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func sizeInt64(i int64) (size int) {
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for ; i != 0 || size == 0; i >>= 8 {
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size++
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}
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return
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}
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func writeInt64(bytes *Bytes, i int64) (size int) {
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for ; i != 0 || size == 0; i >>= 8 { // Write at least one byte even if the value is 0
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bytes.writeBytes([]byte{byte(i)})
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size++
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}
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return
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}
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// parseInt treats the given bytes as a big-endian, signed integer and returns
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// the result.
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func parseInt32(bytes []byte) (int32, error) {
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ret64, err := parseInt64(bytes)
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if err != nil {
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return 0, err
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}
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if ret64 != int64(int32(ret64)) {
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return 0, StructuralError{"integer too large"}
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}
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return int32(ret64), nil
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}
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func sizeInt32(i int32) int {
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return sizeInt64(int64(i))
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}
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func writeInt32(bytes *Bytes, i int32) int {
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return writeInt64(bytes, int64(i))
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}
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var bigOne = big.NewInt(1)
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// // parseBigInt treats the given bytes as a big-endian, signed integer and returns
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// // the result.
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// func parseBigInt(bytes []byte) *big.Int {
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// ret := new(big.Int)
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// if len(bytes) > 0 && bytes[0]&0x80 == 0x80 {
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// // This is a negative number.
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// notBytes := make([]byte, len(bytes))
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// for i := range notBytes {
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// notBytes[i] = ^bytes[i]
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// }
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// ret.SetBytes(notBytes)
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// ret.Add(ret, bigOne)
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// ret.Neg(ret)
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// return ret
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// }
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// ret.SetBytes(bytes)
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// return ret
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// }
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// // BIT STRING
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// // BitString is the structure to use when you want an ASN.1 BIT STRING type. A
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// // bit string is padded up to the nearest byte in memory and the number of
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// // valid bits is recorded. Padding bits will be zero.
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// type BitString struct {
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// Bytes []byte // bits packed into bytes.
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// BitLength int // length in bits.
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// }
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// // At returns the bit at the given index. If the index is out of range it
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// // returns false.
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// func (b BitString) At(i int) int {
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// if i < 0 || i >= b.BitLength {
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// return 0
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// }
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// x := i / 8
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// y := 7 - uint(i%8)
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// return int(b.Bytes[x]>>y) & 1
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// }
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// // RightAlign returns a slice where the padding bits are at the beginning. The
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// // slice may share memory with the BitString.
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// func (b BitString) RightAlign() []byte {
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// shift := uint(8 - (b.BitLength % 8))
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// if shift == 8 || len(b.Bytes) == 0 {
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// return b.Bytes
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// }
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// a := make([]byte, len(b.Bytes))
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// a[0] = b.Bytes[0] >> shift
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// for i := 1; i < len(b.Bytes); i++ {
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// a[i] = b.Bytes[i-1] << (8 - shift)
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// a[i] |= b.Bytes[i] >> shift
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// }
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// return a
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// }
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// // parseBitString parses an ASN.1 bit string from the given byte slice and returns it.
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// func parseBitString(bytes []byte) (ret BitString, err error) {
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// if len(bytes) == 0 {
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// err = SyntaxError{"zero length BIT STRING"}
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// return
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// }
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// paddingBits := int(bytes[0])
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// if paddingBits > 7 ||
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// len(bytes) == 1 && paddingBits > 0 ||
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// bytes[len(bytes)-1]&((1<<bytes[0])-1) != 0 {
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// err = SyntaxError{"invalid padding bits in BIT STRING"}
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// return
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// }
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// ret.BitLength = (len(bytes)-1)*8 - paddingBits
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// ret.Bytes = bytes[1:]
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// return
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// }
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// OBJECT IDENTIFIER
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// An ObjectIdentifier represents an ASN.1 OBJECT IDENTIFIER.
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// type ObjectIdentifier []int
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// // Equal reports whether oi and other represent the same identifier.
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// func (oi ObjectIdentifier) Equal(other ObjectIdentifier) bool {
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// if len(oi) != len(other) {
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// return false
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// }
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// for i := 0; i < len(oi); i++ {
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// if oi[i] != other[i] {
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// return false
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// }
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// }
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// return true
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// }
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// func (oi ObjectIdentifier) String() string {
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// var s string
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// for i, v := range oi {
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// if i > 0 {
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// s += "."
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// }
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// s += strconv.Itoa(v)
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// }
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// return s
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// }
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// // parseObjectIdentifier parses an OBJECT IDENTIFIER from the given bytes and
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// // returns it. An object identifier is a sequence of variable length integers
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// // that are assigned in a hierarchy.
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// func parseObjectIdentifier(bytes []byte) (s []int, err error) {
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// if len(bytes) == 0 {
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// err = SyntaxError{"zero length OBJECT IDENTIFIER"}
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// return
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// }
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// // In the worst case, we get two elements from the first byte (which is
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// // encoded differently) and then every varint is a single byte long.
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// s = make([]int, len(bytes)+1)
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// // The first varint is 40*value1 + value2:
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// // According to this packing, value1 can take the values 0, 1 and 2 only.
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// // When value1 = 0 or value1 = 1, then value2 is <= 39. When value1 = 2,
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// // then there are no restrictions on value2.
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// v, offset, err := parseBase128Int(bytes, 0)
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// if err != nil {
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// return
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// }
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// if v < 80 {
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// s[0] = v / 40
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// s[1] = v % 40
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// } else {
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// s[0] = 2
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// s[1] = v - 80
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// }
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// i := 2
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// for ; offset < len(bytes); i++ {
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// v, offset, err = parseBase128Int(bytes, offset)
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// if err != nil {
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// return
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// }
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// s[i] = v
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// }
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// s = s[0:i]
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// return
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// }
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// ENUMERATED
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// An Enumerated is represented as a plain int.
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type Enumerated int
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// FLAG
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// A Flag accepts any data and is set to true if present.
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type Flag bool
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// parseBase128Int parses a base-128 encoded int from the given offset in the
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// given byte slice. It returns the value and the new offset.
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func parseBase128Int(bytes []byte, initOffset int) (ret, offset int, err error) {
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offset = initOffset
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for shifted := 0; offset < len(bytes); shifted++ {
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if shifted > 4 {
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err = StructuralError{"base 128 integer too large"}
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return
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}
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ret <<= 7
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b := bytes[offset]
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ret |= int(b & 0x7f)
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offset++
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if b&0x80 == 0 {
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return
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}
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}
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err = SyntaxError{"truncated base 128 integer"}
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return
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}
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func sizeBase128Int(value int) (size int) {
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for i := value; i > 0; i >>= 7 {
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size++
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}
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return
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}
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// Write start as the end of the slice and goes back
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// We assume we have enough size
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func writeBase128Int(bytes *Bytes, value int) (size int) {
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for ; value > 0 || size == 0; value >>= 7 { // Write at least one byte even if the value is 0
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// Get the 7 lowest bits
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b := byte(value) & 0x7f
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if value < 128 {
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b |= 0x80
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}
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bytes.writeBytes([]byte{b})
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size++
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}
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return
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}
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|
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// // UTCTime
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// func parseUTCTime(bytes []byte) (ret time.Time, err error) {
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// s := string(bytes)
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// ret, err = time.Parse("0601021504Z0700", s)
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// if err != nil {
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// ret, err = time.Parse("060102150405Z0700", s)
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// }
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// if err == nil && ret.Year() >= 2050 {
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// // UTCTime only encodes times prior to 2050. See https://tools.ietf.org/html/rfc5280#section-4.1.2.5.1
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// ret = ret.AddDate(-100, 0, 0)
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// }
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// return
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// }
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// // parseGeneralizedTime parses the GeneralizedTime from the given byte slice
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// // and returns the resulting time.
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// func parseGeneralizedTime(bytes []byte) (ret time.Time, err error) {
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// return time.Parse("20060102150405Z0700", string(bytes))
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// }
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// // PrintableString
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// // parsePrintableString parses a ASN.1 PrintableString from the given byte
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// // array and returns it.
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// func parsePrintableString(bytes []byte) (ret string, err error) {
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// for _, b := range bytes {
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// if !isPrintable(b) {
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// err = SyntaxError{"PrintableString contains invalid character"}
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// return
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// }
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// }
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// ret = string(bytes)
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// return
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// }
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// // isPrintable returns true iff the given b is in the ASN.1 PrintableString set.
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// func isPrintable(b byte) bool {
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// return 'a' <= b && b <= 'z' ||
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// 'A' <= b && b <= 'Z' ||
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// '0' <= b && b <= '9' ||
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// '\'' <= b && b <= ')' ||
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// '+' <= b && b <= '/' ||
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// b == ' ' ||
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// b == ':' ||
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// b == '=' ||
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// b == '?' ||
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// // This is technically not allowed in a PrintableString.
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// // However, x509 certificates with wildcard strings don't
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// // always use the correct string type so we permit it.
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// b == '*'
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// }
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// // IA5String
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// // parseIA5String parses a ASN.1 IA5String (ASCII string) from the given
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// // byte slice and returns it.
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// func parseIA5String(bytes []byte) (ret string, err error) {
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// for _, b := range bytes {
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// if b >= 0x80 {
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// err = SyntaxError{"IA5String contains invalid character"}
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// return
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// }
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// }
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// ret = string(bytes)
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// return
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// }
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// // T61String
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|
|
// // parseT61String parses a ASN.1 T61String (8-bit clean string) from the given
|
|
// // byte slice and returns it.
|
|
// func parseT61String(bytes []byte) (ret string, err error) {
|
|
// return string(bytes), nil
|
|
// }
|
|
|
|
// UTF8String
|
|
|
|
// parseUTF8String parses a ASN.1 UTF8String (raw UTF-8) from the given byte
|
|
// array and returns it.
|
|
// func parseUTF8String(bytes []byte) (ret string, err error) {
|
|
// return string(bytes), nil
|
|
// }
|
|
// func sizeUTF8String(s string) int {
|
|
// return len(s)
|
|
// }
|
|
// func writeUTF8String(bytes *Bytes, s string) int {
|
|
// return bytes.writeString(s)
|
|
// }
|
|
|
|
// Octet string
|
|
func parseOctetString(bytes []byte) (ret []byte, err error) {
|
|
return bytes, nil
|
|
}
|
|
func sizeOctetString(s []byte) int {
|
|
return len(s)
|
|
}
|
|
func writeOctetString(bytes *Bytes, s []byte) int {
|
|
return bytes.writeBytes(s)
|
|
}
|
|
|
|
// A RawValue represents an undecoded ASN.1 object.
|
|
type RawValue struct {
|
|
Class, Tag int
|
|
IsCompound bool
|
|
Bytes []byte
|
|
FullBytes []byte // includes the tag and length
|
|
}
|
|
|
|
// RawContent is used to signal that the undecoded, DER data needs to be
|
|
// preserved for a struct. To use it, the first field of the struct must have
|
|
// this type. It's an error for any of the other fields to have this type.
|
|
type RawContent []byte
|
|
|
|
// Tagging
|
|
|
|
// parseTagAndLength parses an ASN.1 tag and length pair from the given offset
|
|
// into a byte slice. It returns the parsed data and the new offset. SET and
|
|
// SET OF (tag 17) are mapped to SEQUENCE and SEQUENCE OF (tag 16) since we
|
|
// don't distinguish between ordered and unordered objects in this code.
|
|
func parseTagAndLength(bytes []byte, initOffset int) (ret TagAndLength, offset int, err error) {
|
|
offset = initOffset
|
|
b := bytes[offset]
|
|
offset++
|
|
ret.Class = int(b >> 6)
|
|
ret.IsCompound = b&0x20 == 0x20
|
|
ret.Tag = int(b & 0x1f)
|
|
|
|
// If the bottom five bits are set, then the tag number is actually base 128
|
|
// encoded afterwards
|
|
if ret.Tag == 0x1f {
|
|
ret.Tag, offset, err = parseBase128Int(bytes, offset)
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
if offset >= len(bytes) {
|
|
err = SyntaxError{"truncated tag or length"}
|
|
return
|
|
}
|
|
b = bytes[offset]
|
|
offset++
|
|
if b&0x80 == 0 {
|
|
// The length is encoded in the bottom 7 bits.
|
|
ret.Length = int(b & 0x7f)
|
|
} else {
|
|
// Bottom 7 bits give the number of length bytes to follow.
|
|
numBytes := int(b & 0x7f)
|
|
if numBytes == 0 {
|
|
err = SyntaxError{"indefinite length found (not DER)"}
|
|
return
|
|
}
|
|
ret.Length = 0
|
|
for i := 0; i < numBytes; i++ {
|
|
if offset >= len(bytes) {
|
|
err = SyntaxError{"truncated tag or length"}
|
|
return
|
|
}
|
|
b = bytes[offset]
|
|
offset++
|
|
if ret.Length >= 1<<23 {
|
|
// We can't shift ret.length up without
|
|
// overflowing.
|
|
err = StructuralError{"length too large"}
|
|
return
|
|
}
|
|
ret.Length <<= 8
|
|
ret.Length |= int(b)
|
|
if ret.Length == 0 {
|
|
// DER requires that lengths be minimal.
|
|
err = StructuralError{"superfluous leading zeros in length"}
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// func writeTagAndLength(out *forkableWriter, t tagAndLength) (err error) {
|
|
// b := uint8(t.class) << 6
|
|
// if t.isCompound {
|
|
// b |= 0x20
|
|
// }
|
|
// if t.tag >= 31 {
|
|
// b |= 0x1f
|
|
// err = out.WriteByte(b)
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// err = marshalBase128Int(out, int64(t.tag))
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// } else {
|
|
// b |= uint8(t.tag)
|
|
// err = out.WriteByte(b)
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// }
|
|
|
|
// if t.length >= 128 {
|
|
// l := lengthLength(t.length)
|
|
// err = out.WriteByte(0x80 | byte(l))
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// err = marshalLength(out, t.length)
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// } else {
|
|
// err = out.WriteByte(byte(t.length))
|
|
// if err != nil {
|
|
// return
|
|
// }
|
|
// }
|
|
|
|
// return nil
|
|
// }
|
|
|
|
func sizeTagAndLength(tag int, length int) (size int) {
|
|
// Compute the size of the tag
|
|
size = 1
|
|
if tag >= 31 {
|
|
// Long-form identifier if the tag is greater than 30
|
|
// http://en.wikipedia.org/wiki/X.690#Identifier_tags_greater_than_30
|
|
size += sizeBase128Int(tag)
|
|
}
|
|
// Compute the size of the length using the definite form
|
|
// http://en.wikipedia.org/wiki/X.690#The_definite_form
|
|
size += 1
|
|
if length >= 128 {
|
|
size += 1
|
|
for length > 255 {
|
|
size++
|
|
length >>= 8
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func writeTagAndLength(bytes *Bytes, t TagAndLength) (size int) {
|
|
// We are writing backward, so write the length bytes first
|
|
if t.Length < 0 {
|
|
panic("Can't have a negative length")
|
|
|
|
} else if t.Length >= 128 {
|
|
lengthBytes := writeInt64(bytes, int64(t.Length))
|
|
bytes.writeBytes([]byte{byte(0x80 | byte(lengthBytes))})
|
|
size += lengthBytes + 1
|
|
|
|
} else if t.Length < 128 {
|
|
size += bytes.writeBytes([]byte{byte(t.Length)})
|
|
}
|
|
// Then write the tag
|
|
b := uint8(t.Class) << 6
|
|
if t.IsCompound {
|
|
b |= 0x20
|
|
}
|
|
if t.Tag >= 31 {
|
|
b |= 0x1f
|
|
size += writeBase128Int(bytes, t.Tag)
|
|
} else {
|
|
b |= uint8(t.Tag)
|
|
}
|
|
size += bytes.writeBytes([]byte{byte(b)})
|
|
return
|
|
}
|
|
|
|
//
|
|
// END encoding/asn1/asn1.go
|
|
//
|