File: challenge_message.go

package info (click to toggle)
golang-github-azure-go-ntlmssp 0.0~git20160412.e0b63eb-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 108 kB
  • ctags: 90
  • sloc: makefile: 5
file content (82 lines) | stat: -rw-r--r-- 1,808 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
package ntlmssp

import (
	"bytes"
	"encoding/binary"
	"fmt"
)

type challengeMessageFields struct {
	messageHeader
	TargetName      varField
	NegotiateFlags  negotiateFlags
	ServerChallenge [8]byte
	_               [8]byte
	TargetInfo      varField
}

func (m challengeMessageFields) IsValid() bool {
	return m.messageHeader.IsValid() && m.MessageType == 2
}

type challengeMessage struct {
	challengeMessageFields
	TargetName    string
	TargetInfo    map[avID][]byte
	TargetInfoRaw []byte
}

func (m *challengeMessage) UnmarshalBinary(data []byte) error {
	r := bytes.NewReader(data)
	err := binary.Read(r, binary.LittleEndian, &m.challengeMessageFields)
	if err != nil {
		return err
	}
	if !m.challengeMessageFields.IsValid() {
		return fmt.Errorf("Message is not a valid challenge message: %+v", m.challengeMessageFields.messageHeader)
	}

	if m.challengeMessageFields.TargetName.Len > 0 {
		m.TargetName, err = m.challengeMessageFields.TargetName.ReadStringFrom(data, m.NegotiateFlags.Has(negotiateFlagNTLMSSPNEGOTIATEUNICODE))
		if err != nil {
			return err
		}
	}

	if m.challengeMessageFields.TargetInfo.Len > 0 {
		d, err := m.challengeMessageFields.TargetInfo.ReadFrom(data)
		m.TargetInfoRaw = d
		if err != nil {
			return err
		}
		m.TargetInfo = make(map[avID][]byte)
		r := bytes.NewReader(d)
		for {
			var id avID
			var l uint16
			err = binary.Read(r, binary.LittleEndian, &id)
			if err != nil {
				return err
			}
			if id == avIDMsvAvEOL {
				break
			}

			err = binary.Read(r, binary.LittleEndian, &l)
			if err != nil {
				return err
			}
			value := make([]byte, l)
			n, err := r.Read(value)
			if err != nil {
				return err
			}
			if n != int(l) {
				return fmt.Errorf("Expected to read %d bytes, got only %d", l, n)
			}
			m.TargetInfo[id] = value
		}
	}

	return nil
}