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393 lines
12 KiB
393 lines
12 KiB
// +build !windows
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package mssql
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import (
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"crypto/des"
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"crypto/hmac"
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"crypto/md5"
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"crypto/rand"
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"encoding/binary"
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"errors"
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"fmt"
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"strings"
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"time"
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"unicode/utf16"
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//lint:ignore SA1019 MD4 is used by legacy NTLM
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"golang.org/x/crypto/md4"
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)
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const (
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_NEGOTIATE_MESSAGE = 1
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_CHALLENGE_MESSAGE = 2
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_AUTHENTICATE_MESSAGE = 3
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)
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const (
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_NEGOTIATE_UNICODE = 0x00000001
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_NEGOTIATE_OEM = 0x00000002
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_NEGOTIATE_TARGET = 0x00000004
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_NEGOTIATE_SIGN = 0x00000010
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_NEGOTIATE_SEAL = 0x00000020
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_NEGOTIATE_DATAGRAM = 0x00000040
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_NEGOTIATE_LMKEY = 0x00000080
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_NEGOTIATE_NTLM = 0x00000200
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_NEGOTIATE_ANONYMOUS = 0x00000800
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_NEGOTIATE_OEM_DOMAIN_SUPPLIED = 0x00001000
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_NEGOTIATE_OEM_WORKSTATION_SUPPLIED = 0x00002000
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_NEGOTIATE_ALWAYS_SIGN = 0x00008000
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_NEGOTIATE_TARGET_TYPE_DOMAIN = 0x00010000
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_NEGOTIATE_TARGET_TYPE_SERVER = 0x00020000
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_NEGOTIATE_EXTENDED_SESSIONSECURITY = 0x00080000
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_NEGOTIATE_IDENTIFY = 0x00100000
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_REQUEST_NON_NT_SESSION_KEY = 0x00400000
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_NEGOTIATE_TARGET_INFO = 0x00800000
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_NEGOTIATE_VERSION = 0x02000000
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_NEGOTIATE_128 = 0x20000000
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_NEGOTIATE_KEY_EXCH = 0x40000000
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_NEGOTIATE_56 = 0x80000000
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)
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const _NEGOTIATE_FLAGS = _NEGOTIATE_UNICODE |
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_NEGOTIATE_NTLM |
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_NEGOTIATE_OEM_DOMAIN_SUPPLIED |
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_NEGOTIATE_OEM_WORKSTATION_SUPPLIED |
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_NEGOTIATE_ALWAYS_SIGN |
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_NEGOTIATE_EXTENDED_SESSIONSECURITY
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type ntlmAuth struct {
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Domain string
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UserName string
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Password string
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Workstation string
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}
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func getAuth(user, password, service, workstation string) (auth, bool) {
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if !strings.ContainsRune(user, '\\') {
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return nil, false
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}
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domain_user := strings.SplitN(user, "\\", 2)
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return &ntlmAuth{
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Domain: domain_user[0],
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UserName: domain_user[1],
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Password: password,
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Workstation: workstation,
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}, true
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}
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func utf16le(val string) []byte {
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var v []byte
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for _, r := range val {
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if utf16.IsSurrogate(r) {
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r1, r2 := utf16.EncodeRune(r)
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v = append(v, byte(r1), byte(r1>>8))
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v = append(v, byte(r2), byte(r2>>8))
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} else {
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v = append(v, byte(r), byte(r>>8))
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}
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}
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return v
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}
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func (auth *ntlmAuth) InitialBytes() ([]byte, error) {
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domain_len := len(auth.Domain)
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workstation_len := len(auth.Workstation)
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msg := make([]byte, 40+domain_len+workstation_len)
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copy(msg, []byte("NTLMSSP\x00"))
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binary.LittleEndian.PutUint32(msg[8:], _NEGOTIATE_MESSAGE)
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binary.LittleEndian.PutUint32(msg[12:], _NEGOTIATE_FLAGS)
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// Domain Name Fields
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binary.LittleEndian.PutUint16(msg[16:], uint16(domain_len))
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binary.LittleEndian.PutUint16(msg[18:], uint16(domain_len))
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binary.LittleEndian.PutUint32(msg[20:], 40)
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// Workstation Fields
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binary.LittleEndian.PutUint16(msg[24:], uint16(workstation_len))
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binary.LittleEndian.PutUint16(msg[26:], uint16(workstation_len))
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binary.LittleEndian.PutUint32(msg[28:], uint32(40+domain_len))
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// Version
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binary.LittleEndian.PutUint32(msg[32:], 0)
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binary.LittleEndian.PutUint32(msg[36:], 0)
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// Payload
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copy(msg[40:], auth.Domain)
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copy(msg[40+domain_len:], auth.Workstation)
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return msg, nil
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}
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var errorNTLM = errors.New("NTLM protocol error")
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func createDesKey(bytes, material []byte) {
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material[0] = bytes[0]
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material[1] = (byte)(bytes[0]<<7 | (bytes[1]&0xff)>>1)
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material[2] = (byte)(bytes[1]<<6 | (bytes[2]&0xff)>>2)
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material[3] = (byte)(bytes[2]<<5 | (bytes[3]&0xff)>>3)
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material[4] = (byte)(bytes[3]<<4 | (bytes[4]&0xff)>>4)
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material[5] = (byte)(bytes[4]<<3 | (bytes[5]&0xff)>>5)
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material[6] = (byte)(bytes[5]<<2 | (bytes[6]&0xff)>>6)
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material[7] = (byte)(bytes[6] << 1)
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}
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func encryptDes(key []byte, cleartext []byte, ciphertext []byte) {
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var desKey [8]byte
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createDesKey(key, desKey[:])
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cipher, err := des.NewCipher(desKey[:])
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if err != nil {
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panic(err)
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}
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cipher.Encrypt(ciphertext, cleartext)
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}
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func response(challenge [8]byte, hash [21]byte) (ret [24]byte) {
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encryptDes(hash[:7], challenge[:], ret[:8])
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encryptDes(hash[7:14], challenge[:], ret[8:16])
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encryptDes(hash[14:], challenge[:], ret[16:])
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return
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}
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func lmHash(password string) (hash [21]byte) {
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var lmpass [14]byte
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copy(lmpass[:14], []byte(strings.ToUpper(password)))
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magic := []byte("KGS!@#$%")
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encryptDes(lmpass[:7], magic, hash[:8])
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encryptDes(lmpass[7:], magic, hash[8:])
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return
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}
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func lmResponse(challenge [8]byte, password string) [24]byte {
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hash := lmHash(password)
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return response(challenge, hash)
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}
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func ntlmHash(password string) (hash [21]byte) {
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h := md4.New()
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h.Write(utf16le(password))
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h.Sum(hash[:0])
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return
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}
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func ntResponse(challenge [8]byte, password string) [24]byte {
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hash := ntlmHash(password)
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return response(challenge, hash)
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}
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func clientChallenge() (nonce [8]byte) {
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_, err := rand.Read(nonce[:])
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if err != nil {
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panic(err)
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}
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return
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}
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func ntlmSessionResponse(clientNonce [8]byte, serverChallenge [8]byte, password string) [24]byte {
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var sessionHash [16]byte
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h := md5.New()
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h.Write(serverChallenge[:])
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h.Write(clientNonce[:])
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h.Sum(sessionHash[:0])
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var hash [8]byte
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copy(hash[:], sessionHash[:8])
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passwordHash := ntlmHash(password)
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return response(hash, passwordHash)
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}
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func ntlmHashNoPadding(val string) []byte {
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hash := make([]byte, 16)
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h := md4.New()
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h.Write(utf16le(val))
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h.Sum(hash[:0])
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return hash
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}
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func hmacMD5(passwordHash, data []byte) []byte {
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hmacEntity := hmac.New(md5.New, passwordHash)
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hmacEntity.Write(data)
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return hmacEntity.Sum(nil)
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}
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func getNTLMv2AndLMv2ResponsePayloads(userDomain, username, password string, challenge, nonce [8]byte, targetInfoFields []byte, timestamp time.Time) (ntlmV2Payload, lmV2Payload []byte) {
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// NTLMv2 response payload: http://davenport.sourceforge.net/ntlm.html#theNtlmv2Response
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ntlmHash := ntlmHashNoPadding(password)
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usernameAndTargetBytes := utf16le(strings.ToUpper(username) + userDomain)
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ntlmV2Hash := hmacMD5(ntlmHash, usernameAndTargetBytes)
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targetInfoLength := len(targetInfoFields)
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blob := make([]byte, 32+targetInfoLength)
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binary.BigEndian.PutUint32(blob[:4], 0x01010000)
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binary.BigEndian.PutUint32(blob[4:8], 0x00000000)
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binary.BigEndian.PutUint64(blob[8:16], uint64(timestamp.UnixNano()))
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copy(blob[16:24], nonce[:])
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binary.BigEndian.PutUint32(blob[24:28], 0x00000000)
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copy(blob[28:], targetInfoFields)
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binary.BigEndian.PutUint32(blob[28+targetInfoLength:], 0x00000000)
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challengeLength := len(challenge)
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blobLength := len(blob)
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challengeAndBlob := make([]byte, challengeLength+blobLength)
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copy(challengeAndBlob[:challengeLength], challenge[:])
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copy(challengeAndBlob[challengeLength:], blob)
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hashedChallenge := hmacMD5(ntlmV2Hash, challengeAndBlob)
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ntlmV2Payload = append(hashedChallenge, blob...)
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// LMv2 response payload: http://davenport.sourceforge.net/ntlm.html#theLmv2Response
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ntlmV2hash := hmacMD5(ntlmHash, usernameAndTargetBytes)
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challengeAndNonce := make([]byte, 16)
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copy(challengeAndNonce[:8], challenge[:])
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copy(challengeAndNonce[8:], nonce[:])
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hashedChallenge = hmacMD5(ntlmV2hash, challengeAndNonce)
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lmV2Payload = append(hashedChallenge, nonce[:]...)
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return
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}
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func negotiateExtendedSessionSecurity(flags uint32, message []byte, challenge [8]byte, username, password, userDom string) (lm, nt []byte, err error) {
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nonce := clientChallenge()
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// Official specification: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-nlmp/b38c36ed-2804-4868-a9ff-8dd3182128e4
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// Unofficial walk through referenced by https://www.freetds.org/userguide/domains.htm: http://davenport.sourceforge.net/ntlm.html
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if (flags & _NEGOTIATE_TARGET_INFO) != 0 {
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targetInfoFields, err := getNTLMv2TargetInfoFields(message)
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if err != nil {
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return lm, nt, err
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}
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nt, lm = getNTLMv2AndLMv2ResponsePayloads(userDom, username, password, challenge, nonce, targetInfoFields, time.Now())
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return lm, nt, nil
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}
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var lm_bytes [24]byte
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copy(lm_bytes[:8], nonce[:])
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lm = lm_bytes[:]
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nt_bytes := ntlmSessionResponse(nonce, challenge, password)
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nt = nt_bytes[:]
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return lm, nt, nil
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}
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func getNTLMv2TargetInfoFields(type2Message []byte) (info []byte, err error) {
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type2MessageError := "mssql: while parsing NTLMv2 type 2 message, length %d too small for offset %d"
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type2MessageLength := len(type2Message)
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if type2MessageLength < 20 {
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return nil, fmt.Errorf(type2MessageError, type2MessageLength, 20)
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}
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targetNameAllocated := binary.LittleEndian.Uint16(type2Message[14:16])
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targetNameOffset := binary.LittleEndian.Uint32(type2Message[16:20])
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endOfOffset := int(targetNameOffset + uint32(targetNameAllocated))
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if type2MessageLength < endOfOffset {
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return nil, fmt.Errorf(type2MessageError, type2MessageLength, endOfOffset)
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}
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targetInformationAllocated := binary.LittleEndian.Uint16(type2Message[42:44])
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targetInformationDataOffset := binary.LittleEndian.Uint32(type2Message[44:48])
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endOfOffset = int(targetInformationDataOffset + uint32(targetInformationAllocated))
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if type2MessageLength < endOfOffset {
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return nil, fmt.Errorf(type2MessageError, type2MessageLength, endOfOffset)
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}
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targetInformationBytes := make([]byte, targetInformationAllocated)
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copy(targetInformationBytes, type2Message[targetInformationDataOffset:targetInformationDataOffset+uint32(targetInformationAllocated)])
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return targetInformationBytes, nil
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}
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func buildNTLMResponsePayload(lm, nt []byte, flags uint32, domain, workstation, username string) ([]byte, error) {
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lm_len := len(lm)
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nt_len := len(nt)
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domain16 := utf16le(domain)
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domain_len := len(domain16)
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user16 := utf16le(username)
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user_len := len(user16)
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workstation16 := utf16le(workstation)
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workstation_len := len(workstation16)
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msg := make([]byte, 88+lm_len+nt_len+domain_len+user_len+workstation_len)
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copy(msg, []byte("NTLMSSP\x00"))
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binary.LittleEndian.PutUint32(msg[8:], _AUTHENTICATE_MESSAGE)
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// Lm Challenge Response Fields
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binary.LittleEndian.PutUint16(msg[12:], uint16(lm_len))
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binary.LittleEndian.PutUint16(msg[14:], uint16(lm_len))
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binary.LittleEndian.PutUint32(msg[16:], 88)
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// Nt Challenge Response Fields
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binary.LittleEndian.PutUint16(msg[20:], uint16(nt_len))
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binary.LittleEndian.PutUint16(msg[22:], uint16(nt_len))
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binary.LittleEndian.PutUint32(msg[24:], uint32(88+lm_len))
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// Domain Name Fields
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binary.LittleEndian.PutUint16(msg[28:], uint16(domain_len))
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binary.LittleEndian.PutUint16(msg[30:], uint16(domain_len))
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binary.LittleEndian.PutUint32(msg[32:], uint32(88+lm_len+nt_len))
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// User Name Fields
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binary.LittleEndian.PutUint16(msg[36:], uint16(user_len))
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binary.LittleEndian.PutUint16(msg[38:], uint16(user_len))
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binary.LittleEndian.PutUint32(msg[40:], uint32(88+lm_len+nt_len+domain_len))
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// Workstation Fields
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binary.LittleEndian.PutUint16(msg[44:], uint16(workstation_len))
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binary.LittleEndian.PutUint16(msg[46:], uint16(workstation_len))
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binary.LittleEndian.PutUint32(msg[48:], uint32(88+lm_len+nt_len+domain_len+user_len))
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// Encrypted Random Session Key Fields
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binary.LittleEndian.PutUint16(msg[52:], 0)
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binary.LittleEndian.PutUint16(msg[54:], 0)
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binary.LittleEndian.PutUint32(msg[56:], uint32(88+lm_len+nt_len+domain_len+user_len+workstation_len))
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// Negotiate Flags
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binary.LittleEndian.PutUint32(msg[60:], flags)
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// Version
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binary.LittleEndian.PutUint32(msg[64:], 0)
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binary.LittleEndian.PutUint32(msg[68:], 0)
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// MIC
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binary.LittleEndian.PutUint32(msg[72:], 0)
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binary.LittleEndian.PutUint32(msg[76:], 0)
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binary.LittleEndian.PutUint32(msg[88:], 0)
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binary.LittleEndian.PutUint32(msg[84:], 0)
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// Payload
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copy(msg[88:], lm)
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copy(msg[88+lm_len:], nt)
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copy(msg[88+lm_len+nt_len:], domain16)
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copy(msg[88+lm_len+nt_len+domain_len:], user16)
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copy(msg[88+lm_len+nt_len+domain_len+user_len:], workstation16)
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return msg, nil
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}
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func (auth *ntlmAuth) NextBytes(bytes []byte) ([]byte, error) {
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signature := string(bytes[0:8])
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if signature != "NTLMSSP\x00" {
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return nil, errorNTLM
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}
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messageTypeIndicator := binary.LittleEndian.Uint32(bytes[8:12])
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if messageTypeIndicator != _CHALLENGE_MESSAGE {
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return nil, errorNTLM
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}
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var challenge [8]byte
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copy(challenge[:], bytes[24:32])
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flags := binary.LittleEndian.Uint32(bytes[20:24])
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if (flags & _NEGOTIATE_EXTENDED_SESSIONSECURITY) != 0 {
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lm, nt, err := negotiateExtendedSessionSecurity(flags, bytes, challenge, auth.UserName, auth.Password, auth.Domain)
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if err != nil {
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return nil, err
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}
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return buildNTLMResponsePayload(lm, nt, flags, auth.Domain, auth.Workstation, auth.UserName)
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}
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lm_bytes := lmResponse(challenge, auth.Password)
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lm := lm_bytes[:]
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nt_bytes := ntResponse(challenge, auth.Password)
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nt := nt_bytes[:]
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return buildNTLMResponsePayload(lm, nt, flags, auth.Domain, auth.Workstation, auth.UserName)
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}
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func (auth *ntlmAuth) Free() {
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}
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