83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
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package ntlmssp
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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)
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type challengeMessageFields struct {
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messageHeader
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TargetName varField
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NegotiateFlags negotiateFlags
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ServerChallenge [8]byte
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_ [8]byte
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TargetInfo varField
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}
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func (m challengeMessageFields) IsValid() bool {
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return m.messageHeader.IsValid() && m.MessageType == 2
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}
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type challengeMessage struct {
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challengeMessageFields
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TargetName string
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TargetInfo map[avID][]byte
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TargetInfoRaw []byte
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}
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func (m *challengeMessage) UnmarshalBinary(data []byte) error {
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r := bytes.NewReader(data)
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err := binary.Read(r, binary.LittleEndian, &m.challengeMessageFields)
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if err != nil {
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return err
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}
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if !m.challengeMessageFields.IsValid() {
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return fmt.Errorf("Message is not a valid challenge message: %+v", m.challengeMessageFields.messageHeader)
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}
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if m.challengeMessageFields.TargetName.Len > 0 {
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m.TargetName, err = m.challengeMessageFields.TargetName.ReadStringFrom(data, m.NegotiateFlags.Has(negotiateFlagNTLMSSPNEGOTIATEUNICODE))
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if err != nil {
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return err
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}
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}
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if m.challengeMessageFields.TargetInfo.Len > 0 {
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d, err := m.challengeMessageFields.TargetInfo.ReadFrom(data)
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m.TargetInfoRaw = d
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if err != nil {
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return err
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}
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m.TargetInfo = make(map[avID][]byte)
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r := bytes.NewReader(d)
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for {
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var id avID
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var l uint16
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err = binary.Read(r, binary.LittleEndian, &id)
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if err != nil {
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return err
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}
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if id == avIDMsvAvEOL {
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break
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}
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err = binary.Read(r, binary.LittleEndian, &l)
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if err != nil {
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return err
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}
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value := make([]byte, l)
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n, err := r.Read(value)
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if err != nil {
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return err
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}
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if n != int(l) {
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return fmt.Errorf("Expected to read %d bytes, got only %d", l, n)
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}
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m.TargetInfo[id] = value
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}
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}
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return nil
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}
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