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ntlm.go
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ntlm.go
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package ntlmssp
import (
"bytes"
"encoding/binary"
"strings"
"time"
"github.com/bodgit/windows"
"golang.org/x/crypto/md4"
)
const (
lmCiphertext string = "KGS!@#$%"
)
func realCurrentTime() ([]byte, error) {
ft := windows.NsecToFiletime(time.Now().UnixNano())
b := bytes.Buffer{}
if err := binary.Write(&b, binary.LittleEndian, ft); err != nil {
return nil, err
}
return b.Bytes(), nil
}
var currentTime = realCurrentTime
func lmowfV1(password string) ([]byte, error) {
b := bytes.Buffer{}
padded := zeroPad([]byte(strings.ToUpper(password)), 14)
for _, i := range []int{0, 7} {
result, err := encryptDES(padded[i:], []byte(lmCiphertext))
if err != nil {
return nil, err
}
b.Write(result)
}
return b.Bytes(), nil
}
func ntowfV1(password string) ([]byte, error) {
b, err := utf16FromString(password)
if err != nil {
return nil, err
}
return hashMD4(b), nil
}
func ntowfV2(username, password, domain string) ([]byte, error) {
m, err := utf16FromString(strings.ToUpper(username) + domain)
if err != nil {
return nil, err
}
k, err := ntowfV1(password)
if err != nil {
return nil, err
}
return hmacMD5(k, m), nil
}
func lmV1WithSessionSecurityResponse(clientChallenge []byte) []byte {
return zeroPad(clientChallenge, 24)
}
func lmV1Response(password string, serverChallenge []byte) ([]byte, error) {
lmHash, err := lmowfV1(password)
if err != nil {
return nil, err
}
return encryptDESL(lmHash, serverChallenge)
}
func lmV2Response(username, password, domain string, serverChallenge, clientChallenge []byte) ([]byte, error) {
ntlmHash, err := ntowfV2(username, password, domain)
if err != nil {
return nil, err
}
return concat(hmacMD5(ntlmHash, concat(serverChallenge, clientChallenge)), clientChallenge), nil
}
func ntlmV1Response(password string, serverChallenge []byte) ([]byte, []byte, error) {
ntlmHash, err := ntowfV1(password)
if err != nil {
return nil, nil, err
}
response, err := encryptDESL(ntlmHash, serverChallenge)
if err != nil {
return nil, nil, err
}
return response, hashMD4(ntlmHash), nil
}
func ntlm2Response(password string, serverChallenge, clientChallenge []byte) ([]byte, []byte, error) {
ntlmHash, err := ntowfV1(password)
if err != nil {
return nil, nil, err
}
response, err := encryptDESL(ntlmHash, hashMD5(concat(serverChallenge, clientChallenge))[:8])
if err != nil {
return nil, nil, err
}
return response, hashMD4(ntlmHash), nil
}
func ntlmV2Temp(timestamp []byte, clientChallenge []byte, targetInfo targetInfo) ([]byte, error) {
b, err := targetInfo.Marshal()
if err != nil {
return nil, err
}
return concat([]byte{0x01}, []byte{0x01}, zeroBytes(6), timestamp, clientChallenge, zeroBytes(4), b, zeroBytes(4)), nil
}
func ntlmV2Response(username, password, domain string, serverChallenge, clientChallenge []byte, timestamp []byte, targetInfo targetInfo) ([]byte, []byte, error) {
ntlmHash, err := ntowfV2(username, password, domain)
if err != nil {
return nil, nil, err
}
temp, err := ntlmV2Temp(timestamp, clientChallenge, targetInfo)
if err != nil {
return nil, nil, err
}
ntProofStr := hmacMD5(ntlmHash, concat(serverChallenge, temp))
return concat(ntProofStr, temp), hmacMD5(ntlmHash, ntProofStr), nil
}
func ntlmV1ExchangeKey(flags uint32, sessionBaseKey []byte, serverChallenge []byte, lmChallengeResponse []byte, lmHash []byte) ([]byte, error) {
switch {
case ntlmsspNegotiateExtendedSessionsecurity.IsSet(flags):
return hmacMD5(sessionBaseKey, concat(serverChallenge, lmChallengeResponse[:8])), nil
case ntlmsspNegotiateLMKey.IsSet(flags):
b := bytes.Buffer{}
for _, k := range [][]byte{lmHash[:7], concat(lmHash[7:8], bytes.Repeat([]byte{0xbd}, 6))} {
result, err := encryptDES(k, lmChallengeResponse[:8])
if err != nil {
return nil, err
}
b.Write(result)
}
return b.Bytes(), nil
case ntlmsspRequestNonNTSessionKey.IsSet(flags):
return zeroPad(lmHash[:8], 16), nil
default:
return sessionBaseKey, nil
}
}
func lmChallengeResponse(flags uint32, level lmCompatibilityLevel, clientChallenge []byte, username, password, domain string, cm *challengeMessage) ([]byte, error) {
switch {
case ntlmsspAnonymous.IsSet(flags):
return zeroBytes(1), nil
case ntlmsspNegotiateExtendedSessionsecurity.IsSet(flags) && level < 3:
// LMv1 with session security
return lmV1WithSessionSecurityResponse(clientChallenge), nil
case level < 2:
// LMv1 response
return lmV1Response(password, cm.ServerChallenge[:])
case level == 2:
// NTLMv1 response
response, _, err := ntlmV1Response(password, cm.ServerChallenge[:])
return response, err
default:
// LMv2 response
if _, ok := cm.TargetInfo.Get(msvAvTimestamp); ok {
return zeroBytes(24), nil
}
return lmV2Response(username, password, domain, cm.ServerChallenge[:], clientChallenge)
}
}
func ntChallengeResponse(flags uint32, level lmCompatibilityLevel, clientChallenge []byte, username, password, domain string, cm *challengeMessage, lmChallengeResponse []byte, targetInfo targetInfo, channelBindings *ChannelBindings) ([]byte, []byte, error) {
switch {
case ntlmsspAnonymous.IsSet(flags):
return []byte{}, zeroBytes(md4.Size), nil
case level < 3:
var response, sessionBaseKey []byte
var err error
if ntlmsspNegotiateExtendedSessionsecurity.IsSet(flags) {
// NTLMv1 authentication with NTLM2
response, sessionBaseKey, err = ntlm2Response(password, cm.ServerChallenge[:], clientChallenge)
} else {
// NTLMv1 authentication
response, sessionBaseKey, err = ntlmV1Response(password, cm.ServerChallenge[:])
}
if err != nil {
return nil, nil, err
}
lmHash, err := lmowfV1(password)
if err != nil {
return nil, nil, err
}
keyExchangeKey, err := ntlmV1ExchangeKey(flags, sessionBaseKey, cm.ServerChallenge[:], lmChallengeResponse, lmHash)
if err != nil {
return nil, nil, err
}
return response, keyExchangeKey, nil
default:
// NTLMv2 authentication
timestamp, ok := targetInfo.Get(msvAvTimestamp)
if ok {
var flags uint32
if v, ok := targetInfo.Get(msvAvFlags); ok {
flags = binary.LittleEndian.Uint32(v)
flags |= msvAvFlagMICProvided
} else {
flags = msvAvFlagMICProvided
}
v := make([]byte, 4)
binary.LittleEndian.PutUint32(v, flags)
targetInfo.Set(msvAvFlags, v)
} else {
var err error
timestamp, err = currentTime()
if err != nil {
return nil, nil, err
}
}
if channelBindings != nil {
b, err := channelBindings.marshal()
if err != nil {
return nil, nil, err
}
targetInfo.Set(msvChannelBindings, hashMD5(b))
}
return ntlmV2Response(username, password, domain, cm.ServerChallenge[:], clientChallenge, timestamp, targetInfo)
}
}