2 Unix SMB/CIFS implementation.
3 SMB parameters and setup
4 Copyright (C) Andrew Tridgell 1992-1998
5 Modified by Jeremy Allison 1995.
6 Copyright (C) Jeremy Allison 1995-2000.
7 Copyright (C) Luke Kennethc Casson Leighton 1996-2000.
8 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "system/time.h"
26 #include "../libcli/auth/msrpc_parse.h"
27 #include "../lib/crypto/crypto.h"
28 #include "../libcli/auth/libcli_auth.h"
29 #include "../librpc/gen_ndr/ntlmssp.h"
31 void SMBencrypt_hash(const uint8_t lm_hash
[16], const uint8_t *c8
, uint8_t p24
[24])
36 memcpy(p21
, lm_hash
, 16);
38 SMBOWFencrypt(p21
, c8
, p24
);
41 DEBUG(100,("SMBencrypt_hash: lm#, challenge, response\n"));
42 dump_data(100, p21
, 16);
43 dump_data(100, c8
, 8);
44 dump_data(100, p24
, 24);
49 This implements the X/Open SMB password encryption
50 It takes a password ('unix' string), a 8 byte "crypt key"
51 and puts 24 bytes of encrypted password into p24
53 Returns False if password must have been truncated to create LM hash
56 bool SMBencrypt(const char *passwd
, const uint8_t *c8
, uint8_t p24
[24])
61 ret
= E_deshash(passwd
, lm_hash
);
62 SMBencrypt_hash(lm_hash
, c8
, p24
);
67 * Creates the MD4 Hash of the users password in NT UNICODE.
68 * @param passwd password in 'unix' charset.
69 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
72 bool E_md4hash(const char *passwd
, uint8_t p16
[16])
78 ret
= push_ucs2_talloc(NULL
, &wpwd
, passwd
, &len
);
79 if (!ret
|| len
< 2) {
80 /* We don't want to return fixed data, as most callers
82 mdfour(p16
, (const uint8_t *)passwd
, strlen(passwd
));
87 mdfour(p16
, (const uint8_t *)wpwd
, len
);
94 * Creates the MD5 Hash of a combination of 16 byte salt and 16 byte NT hash.
95 * @param 16 byte salt.
96 * @param 16 byte NT hash.
97 * @param 16 byte return hashed with md5, caller allocated 16 byte buffer
100 void E_md5hash(const uint8_t salt
[16], const uint8_t nthash
[16], uint8_t hash_out
[16])
102 struct MD5Context tctx
;
105 memset(hash_out
, '\0', 16);
106 memcpy(array
, salt
, 16);
107 memcpy(&array
[16], nthash
, 16);
109 MD5Update(&tctx
, array
, 32);
110 MD5Final(hash_out
, &tctx
);
114 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
115 * @param passwd password in 'unix' charset.
116 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
117 * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
118 * @note p16 is filled in regardless
121 bool E_deshash(const char *passwd
, uint8_t p16
[16])
127 /* Password must be converted to DOS charset - null terminated, uppercase. */
128 push_string(dospwd
, passwd
, sizeof(dospwd
), STR_ASCII
|STR_UPPER
|STR_TERMINATE
);
130 /* Only the first 14 chars are considered, password need not be null terminated. */
131 E_P16((const uint8_t *)dospwd
, p16
);
133 if (strlen(dospwd
) > 14) {
143 * Creates the MD4 and DES (LM) Hash of the users password.
144 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
145 * @param passwd password in 'unix' charset.
146 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
147 * @param p16 return password hashed with des, caller allocated 16 byte buffer
150 /* Does both the NT and LM owfs of a user's password */
151 void nt_lm_owf_gen(const char *pwd
, uint8_t nt_p16
[16], uint8_t p16
[16])
153 /* Calculate the MD4 hash (NT compatible) of the password */
154 memset(nt_p16
, '\0', 16);
155 E_md4hash(pwd
, nt_p16
);
157 #ifdef DEBUG_PASSWORD
158 DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
159 dump_data(120, (const uint8_t *)pwd
, strlen(pwd
));
160 dump_data(100, nt_p16
, 16);
163 E_deshash(pwd
, (uint8_t *)p16
);
165 #ifdef DEBUG_PASSWORD
166 DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
167 dump_data(120, (const uint8_t *)pwd
, strlen(pwd
));
168 dump_data(100, p16
, 16);
172 /* Does both the NTLMv2 owfs of a user's password */
173 bool ntv2_owf_gen(const uint8_t owf
[16],
174 const char *user_in
, const char *domain_in
,
175 bool upper_case_domain
, /* Transform the domain into UPPER case */
180 size_t user_byte_len
;
181 size_t domain_byte_len
;
185 TALLOC_CTX
*mem_ctx
= talloc_init("ntv2_owf_gen for %s\\%s", domain_in
, user_in
);
199 user_in
= strupper_talloc(mem_ctx
, user_in
);
200 if (user_in
== NULL
) {
201 talloc_free(mem_ctx
);
205 if (upper_case_domain
) {
206 domain_in
= strupper_talloc(mem_ctx
, domain_in
);
207 if (domain_in
== NULL
) {
208 talloc_free(mem_ctx
);
213 ret
= push_ucs2_talloc(mem_ctx
, &user
, user_in
, &user_byte_len
);
215 DEBUG(0, ("push_uss2_talloc() for user failed)\n"));
216 talloc_free(mem_ctx
);
220 ret
= push_ucs2_talloc(mem_ctx
, &domain
, domain_in
, &domain_byte_len
);
222 DEBUG(0, ("push_ucs2_talloc() for domain failed\n"));
223 talloc_free(mem_ctx
);
227 SMB_ASSERT(user_byte_len
>= 2);
228 SMB_ASSERT(domain_byte_len
>= 2);
230 /* We don't want null termination */
231 user_byte_len
= user_byte_len
- 2;
232 domain_byte_len
= domain_byte_len
- 2;
234 hmac_md5_init_limK_to_64(owf
, 16, &ctx
);
235 hmac_md5_update((uint8_t *)user
, user_byte_len
, &ctx
);
236 hmac_md5_update((uint8_t *)domain
, domain_byte_len
, &ctx
);
237 hmac_md5_final(kr_buf
, &ctx
);
239 #ifdef DEBUG_PASSWORD
240 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
241 dump_data(100, (uint8_t *)user
, user_byte_len
);
242 dump_data(100, (uint8_t *)domain
, domain_byte_len
);
243 dump_data(100, owf
, 16);
244 dump_data(100, kr_buf
, 16);
247 talloc_free(mem_ctx
);
251 /* Does the des encryption from the NT or LM MD4 hash. */
252 void SMBOWFencrypt(const uint8_t passwd
[16], const uint8_t *c8
, uint8_t p24
[24])
258 memcpy(p21
, passwd
, 16);
262 /* Does the des encryption. */
264 void SMBNTencrypt_hash(const uint8_t nt_hash
[16], uint8_t *c8
, uint8_t *p24
)
269 memcpy(p21
, nt_hash
, 16);
270 SMBOWFencrypt(p21
, c8
, p24
);
272 #ifdef DEBUG_PASSWORD
273 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
274 dump_data(100, p21
, 16);
275 dump_data(100, c8
, 8);
276 dump_data(100, p24
, 24);
280 /* Does the NT MD4 hash then des encryption. Plaintext version of the above. */
282 void SMBNTencrypt(const char *passwd
, uint8_t *c8
, uint8_t *p24
)
285 E_md4hash(passwd
, nt_hash
);
286 SMBNTencrypt_hash(nt_hash
, c8
, p24
);
290 /* Does the md5 encryption from the Key Response for NTLMv2. */
291 void SMBOWFencrypt_ntv2(const uint8_t kr
[16],
292 const DATA_BLOB
*srv_chal
,
293 const DATA_BLOB
*smbcli_chal
,
294 uint8_t resp_buf
[16])
298 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
299 hmac_md5_update(srv_chal
->data
, srv_chal
->length
, &ctx
);
300 hmac_md5_update(smbcli_chal
->data
, smbcli_chal
->length
, &ctx
);
301 hmac_md5_final(resp_buf
, &ctx
);
303 #ifdef DEBUG_PASSWORD
304 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
305 dump_data(100, srv_chal
->data
, srv_chal
->length
);
306 dump_data(100, smbcli_chal
->data
, smbcli_chal
->length
);
307 dump_data(100, resp_buf
, 16);
311 void SMBsesskeygen_ntv2(const uint8_t kr
[16],
312 const uint8_t * nt_resp
, uint8_t sess_key
[16])
314 /* a very nice, 128 bit, variable session key */
318 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
319 hmac_md5_update(nt_resp
, 16, &ctx
);
320 hmac_md5_final((uint8_t *)sess_key
, &ctx
);
322 #ifdef DEBUG_PASSWORD
323 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
324 dump_data(100, sess_key
, 16);
328 void SMBsesskeygen_ntv1(const uint8_t kr
[16], uint8_t sess_key
[16])
330 /* yes, this session key does not change - yes, this
331 is a problem - but it is 128 bits */
333 mdfour((uint8_t *)sess_key
, kr
, 16);
335 #ifdef DEBUG_PASSWORD
336 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
337 dump_data(100, sess_key
, 16);
341 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash
[16],
342 const uint8_t lm_resp
[24], /* only uses 8 */
343 uint8_t sess_key
[16])
345 /* Calculate the LM session key (effective length 40 bits,
346 but changes with each session) */
348 uint8_t partial_lm_hash
[14];
350 memcpy(partial_lm_hash
, lm_hash
, 8);
351 memset(partial_lm_hash
+ 8, 0xbd, 6);
353 des_crypt56(p24
, lm_resp
, partial_lm_hash
, 1);
354 des_crypt56(p24
+8, lm_resp
, partial_lm_hash
+ 7, 1);
356 memcpy(sess_key
, p24
, 16);
358 #ifdef DEBUG_PASSWORD
359 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
360 dump_data(100, sess_key
, 16);
364 DATA_BLOB
NTLMv2_generate_names_blob(TALLOC_CTX
*mem_ctx
,
365 const char *hostname
,
368 DATA_BLOB names_blob
= data_blob_talloc(mem_ctx
, NULL
, 0);
370 msrpc_gen(mem_ctx
, &names_blob
,
372 MsvAvNbDomainName
, domain
,
373 MsvAvNbComputerName
, hostname
,
378 static DATA_BLOB
NTLMv2_generate_client_data(TALLOC_CTX
*mem_ctx
, const DATA_BLOB
*names_blob
)
380 uint8_t client_chal
[8];
381 DATA_BLOB response
= data_blob(NULL
, 0);
382 uint8_t long_date
[8];
385 unix_to_nt_time(&nttime
, time(NULL
));
387 generate_random_buffer(client_chal
, sizeof(client_chal
));
389 push_nttime(long_date
, 0, nttime
);
391 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
393 msrpc_gen(mem_ctx
, &response
, "ddbbdb",
394 0x00000101, /* Header */
396 long_date
, 8, /* Timestamp */
397 client_chal
, 8, /* client challenge */
399 names_blob
->data
, names_blob
->length
); /* End of name list */
404 static DATA_BLOB
NTLMv2_generate_response(TALLOC_CTX
*out_mem_ctx
,
405 const uint8_t ntlm_v2_hash
[16],
406 const DATA_BLOB
*server_chal
,
407 const DATA_BLOB
*names_blob
)
409 uint8_t ntlmv2_response
[16];
410 DATA_BLOB ntlmv2_client_data
;
411 DATA_BLOB final_response
;
413 TALLOC_CTX
*mem_ctx
= talloc_named(out_mem_ctx
, 0,
414 "NTLMv2_generate_response internal context");
417 return data_blob(NULL
, 0);
421 /* generate some data to pass into the response function - including
422 the hostname and domain name of the server */
423 ntlmv2_client_data
= NTLMv2_generate_client_data(mem_ctx
, names_blob
);
425 /* Given that data, and the challenge from the server, generate a response */
426 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &ntlmv2_client_data
, ntlmv2_response
);
428 final_response
= data_blob_talloc(out_mem_ctx
, NULL
, sizeof(ntlmv2_response
) + ntlmv2_client_data
.length
);
430 memcpy(final_response
.data
, ntlmv2_response
, sizeof(ntlmv2_response
));
432 memcpy(final_response
.data
+sizeof(ntlmv2_response
),
433 ntlmv2_client_data
.data
, ntlmv2_client_data
.length
);
435 talloc_free(mem_ctx
);
437 return final_response
;
440 static DATA_BLOB
LMv2_generate_response(TALLOC_CTX
*mem_ctx
,
441 const uint8_t ntlm_v2_hash
[16],
442 const DATA_BLOB
*server_chal
)
444 uint8_t lmv2_response
[16];
445 DATA_BLOB lmv2_client_data
= data_blob_talloc(mem_ctx
, NULL
, 8);
446 DATA_BLOB final_response
= data_blob_talloc(mem_ctx
, NULL
,24);
449 /* client-supplied random data */
450 generate_random_buffer(lmv2_client_data
.data
, lmv2_client_data
.length
);
452 /* Given that data, and the challenge from the server, generate a response */
453 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &lmv2_client_data
, lmv2_response
);
454 memcpy(final_response
.data
, lmv2_response
, sizeof(lmv2_response
));
456 /* after the first 16 bytes is the random data we generated above,
457 so the server can verify us with it */
458 memcpy(final_response
.data
+sizeof(lmv2_response
),
459 lmv2_client_data
.data
, lmv2_client_data
.length
);
461 data_blob_free(&lmv2_client_data
);
463 return final_response
;
466 bool SMBNTLMv2encrypt_hash(TALLOC_CTX
*mem_ctx
,
467 const char *user
, const char *domain
, const uint8_t nt_hash
[16],
468 const DATA_BLOB
*server_chal
,
469 const DATA_BLOB
*names_blob
,
470 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
471 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
473 uint8_t ntlm_v2_hash
[16];
475 /* We don't use the NT# directly. Instead we use it mashed up with
476 the username and domain.
477 This prevents username swapping during the auth exchange
479 if (!ntv2_owf_gen(nt_hash
, user
, domain
, true, ntlm_v2_hash
)) {
484 *nt_response
= NTLMv2_generate_response(mem_ctx
,
485 ntlm_v2_hash
, server_chal
,
487 if (user_session_key
) {
488 *user_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
490 /* The NTLMv2 calculations also provide a session key, for signing etc later */
491 /* use only the first 16 bytes of nt_response for session key */
492 SMBsesskeygen_ntv2(ntlm_v2_hash
, nt_response
->data
, user_session_key
->data
);
499 *lm_response
= LMv2_generate_response(mem_ctx
,
500 ntlm_v2_hash
, server_chal
);
501 if (lm_session_key
) {
502 *lm_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
504 /* The NTLMv2 calculations also provide a session key, for signing etc later */
505 /* use only the first 16 bytes of lm_response for session key */
506 SMBsesskeygen_ntv2(ntlm_v2_hash
, lm_response
->data
, lm_session_key
->data
);
513 bool SMBNTLMv2encrypt(TALLOC_CTX
*mem_ctx
,
514 const char *user
, const char *domain
,
515 const char *password
,
516 const DATA_BLOB
*server_chal
,
517 const DATA_BLOB
*names_blob
,
518 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
519 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
522 E_md4hash(password
, nt_hash
);
524 return SMBNTLMv2encrypt_hash(mem_ctx
,
525 user
, domain
, nt_hash
, server_chal
, names_blob
,
526 lm_response
, nt_response
, lm_session_key
, user_session_key
);
529 /***********************************************************
530 encode a password buffer with a unicode password. The buffer
531 is filled with random data to make it harder to attack.
532 ************************************************************/
533 bool encode_pw_buffer(uint8_t buffer
[516], const char *password
, int string_flags
)
538 /* the incoming buffer can be any alignment. */
539 string_flags
|= STR_NOALIGN
;
541 new_pw_len
= push_string(new_pw
,
543 sizeof(new_pw
), string_flags
);
545 memcpy(&buffer
[512 - new_pw_len
], new_pw
, new_pw_len
);
547 generate_random_buffer(buffer
, 512 - new_pw_len
);
550 * The length of the new password is in the last 4 bytes of
553 SIVAL(buffer
, 512, new_pw_len
);
559 /***********************************************************
560 decode a password buffer
561 *new_pw_len is the length in bytes of the possibly mulitbyte
562 returned password including termination.
563 ************************************************************/
565 bool decode_pw_buffer(TALLOC_CTX
*ctx
,
566 uint8_t in_buffer
[516],
569 charset_t string_charset
)
577 Warning !!! : This function is called from some rpc call.
578 The password IN the buffer may be a UNICODE string.
579 The password IN new_pwrd is an ASCII string
580 If you reuse that code somewhere else check first.
583 /* The length of the new password is in the last 4 bytes of the data buffer. */
585 byte_len
= IVAL(in_buffer
, 512);
587 #ifdef DEBUG_PASSWORD
588 dump_data(100, in_buffer
, 516);
591 /* Password cannot be longer than the size of the password buffer */
592 if ( (byte_len
< 0) || (byte_len
> 512)) {
593 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len
));
594 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
598 /* decode into the return buffer. */
599 if (!convert_string_talloc(ctx
, string_charset
, CH_UNIX
,
600 &in_buffer
[512 - byte_len
],
605 DEBUG(0, ("decode_pw_buffer: failed to convert incoming password\n"));
609 #ifdef DEBUG_PASSWORD
610 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
611 dump_data(100, (uint8_t *)*pp_new_pwrd
, *new_pw_len
);
612 DEBUG(100,("multibyte len:%lu\n", (unsigned long int)*new_pw_len
));
613 DEBUG(100,("original char len:%d\n", byte_len
/2));
619 /***********************************************************
620 Decode an arc4 encrypted password change buffer.
621 ************************************************************/
623 void encode_or_decode_arc4_passwd_buffer(unsigned char pw_buf
[532], const DATA_BLOB
*psession_key
)
625 struct MD5Context tctx
;
626 unsigned char key_out
[16];
628 /* Confounder is last 16 bytes. */
631 MD5Update(&tctx
, &pw_buf
[516], 16);
632 MD5Update(&tctx
, psession_key
->data
, psession_key
->length
);
633 MD5Final(key_out
, &tctx
);
634 /* arc4 with key_out. */
635 arcfour_crypt(pw_buf
, key_out
, 516);
638 /***********************************************************
639 encode a password buffer with an already unicode password. The
640 rest of the buffer is filled with random data to make it harder to attack.
641 ************************************************************/
642 bool set_pw_in_buffer(uint8_t buffer
[516], DATA_BLOB
*password
)
644 if (password
->length
> 512) {
648 memcpy(&buffer
[512 - password
->length
], password
->data
, password
->length
);
650 generate_random_buffer(buffer
, 512 - password
->length
);
653 * The length of the new password is in the last 4 bytes of
656 SIVAL(buffer
, 512, password
->length
);
660 /***********************************************************
661 decode a password buffer
662 *new_pw_size is the length in bytes of the extracted unicode password
663 ************************************************************/
664 bool extract_pw_from_buffer(TALLOC_CTX
*mem_ctx
,
665 uint8_t in_buffer
[516], DATA_BLOB
*new_pass
)
669 /* The length of the new password is in the last 4 bytes of the data buffer. */
671 byte_len
= IVAL(in_buffer
, 512);
673 #ifdef DEBUG_PASSWORD
674 dump_data(100, in_buffer
, 516);
677 /* Password cannot be longer than the size of the password buffer */
678 if ( (byte_len
< 0) || (byte_len
> 512)) {
682 *new_pass
= data_blob_talloc(mem_ctx
, &in_buffer
[512 - byte_len
], byte_len
);
684 if (!new_pass
->data
) {
692 /* encode a wkssvc_PasswordBuffer:
694 * similar to samr_CryptPasswordEx. Different: 8byte confounder (instead of
695 * 16byte), confounder in front of the 516 byte buffer (instead of after that
696 * buffer), calling MD5Update() first with session_key and then with confounder
697 * (vice versa in samr) - Guenther */
699 void encode_wkssvc_join_password_buffer(TALLOC_CTX
*mem_ctx
,
701 DATA_BLOB
*session_key
,
702 struct wkssvc_PasswordBuffer
**pwd_buf
)
705 struct MD5Context ctx
;
706 struct wkssvc_PasswordBuffer
*my_pwd_buf
= NULL
;
707 DATA_BLOB confounded_session_key
;
708 int confounder_len
= 8;
709 uint8_t confounder
[8];
711 my_pwd_buf
= talloc_zero(mem_ctx
, struct wkssvc_PasswordBuffer
);
716 confounded_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
718 encode_pw_buffer(buffer
, pwd
, STR_UNICODE
);
720 generate_random_buffer((uint8_t *)confounder
, confounder_len
);
723 MD5Update(&ctx
, session_key
->data
, session_key
->length
);
724 MD5Update(&ctx
, confounder
, confounder_len
);
725 MD5Final(confounded_session_key
.data
, &ctx
);
727 arcfour_crypt_blob(buffer
, 516, &confounded_session_key
);
729 memcpy(&my_pwd_buf
->data
[0], confounder
, confounder_len
);
730 memcpy(&my_pwd_buf
->data
[8], buffer
, 516);
732 data_blob_free(&confounded_session_key
);
734 *pwd_buf
= my_pwd_buf
;
737 WERROR
decode_wkssvc_join_password_buffer(TALLOC_CTX
*mem_ctx
,
738 struct wkssvc_PasswordBuffer
*pwd_buf
,
739 DATA_BLOB
*session_key
,
743 struct MD5Context ctx
;
746 DATA_BLOB confounded_session_key
;
748 int confounder_len
= 8;
749 uint8_t confounder
[8];
754 return WERR_BAD_PASSWORD
;
757 if (session_key
->length
!= 16) {
758 DEBUG(10,("invalid session key\n"));
759 return WERR_BAD_PASSWORD
;
762 confounded_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
764 memcpy(&confounder
, &pwd_buf
->data
[0], confounder_len
);
765 memcpy(&buffer
, &pwd_buf
->data
[8], 516);
768 MD5Update(&ctx
, session_key
->data
, session_key
->length
);
769 MD5Update(&ctx
, confounder
, confounder_len
);
770 MD5Final(confounded_session_key
.data
, &ctx
);
772 arcfour_crypt_blob(buffer
, 516, &confounded_session_key
);
774 if (!decode_pw_buffer(mem_ctx
, buffer
, pwd
, &pwd_len
, CH_UTF16
)) {
775 data_blob_free(&confounded_session_key
);
776 return WERR_BAD_PASSWORD
;
779 data_blob_free(&confounded_session_key
);