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/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])
104 MD5Update(&tctx
, salt
, 16);
105 MD5Update(&tctx
, nthash
, 16);
106 MD5Final(hash_out
, &tctx
);
110 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
111 * @param passwd password in 'unix' charset.
112 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
113 * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
114 * @note p16 is filled in regardless
117 bool E_deshash(const char *passwd
, uint8_t p16
[16])
121 TALLOC_CTX
*frame
= talloc_stackframe();
123 size_t converted_size
;
129 tmpbuf
= strupper_talloc(frame
, passwd
);
130 if (tmpbuf
== NULL
) {
131 /* Too many callers don't check this result, we need to fill in the buffer with something */
132 strlcpy((char *)dospwd
, passwd
? passwd
: "", sizeof(dospwd
));
140 ret
= convert_string_error(CH_UNIX
, CH_DOS
, tmpbuf
, strlen(tmpbuf
), dospwd
, sizeof(dospwd
), &converted_size
);
143 /* Only the first 14 chars are considered, password need not
144 * be null terminated. We do this in the error and success
145 * case to avoid returning a fixed 'password' buffer, but
146 * callers should not use it when E_deshash returns false */
148 E_P16((const uint8_t *)dospwd
, p16
);
156 * Creates the MD4 and DES (LM) Hash of the users password.
157 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
158 * @param passwd password in 'unix' charset.
159 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
160 * @param p16 return password hashed with des, caller allocated 16 byte buffer
163 /* Does both the NT and LM owfs of a user's password */
164 void nt_lm_owf_gen(const char *pwd
, uint8_t nt_p16
[16], uint8_t p16
[16])
166 /* Calculate the MD4 hash (NT compatible) of the password */
167 memset(nt_p16
, '\0', 16);
168 E_md4hash(pwd
, nt_p16
);
170 #ifdef DEBUG_PASSWORD
171 DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
172 dump_data(120, (const uint8_t *)pwd
, strlen(pwd
));
173 dump_data(100, nt_p16
, 16);
176 E_deshash(pwd
, (uint8_t *)p16
);
178 #ifdef DEBUG_PASSWORD
179 DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
180 dump_data(120, (const uint8_t *)pwd
, strlen(pwd
));
181 dump_data(100, p16
, 16);
185 /* Does both the NTLMv2 owfs of a user's password */
186 bool ntv2_owf_gen(const uint8_t owf
[16],
187 const char *user_in
, const char *domain_in
,
192 size_t user_byte_len
;
193 size_t domain_byte_len
;
197 TALLOC_CTX
*mem_ctx
= talloc_init("ntv2_owf_gen for %s\\%s", domain_in
, user_in
);
211 user_in
= strupper_talloc(mem_ctx
, user_in
);
212 if (user_in
== NULL
) {
213 talloc_free(mem_ctx
);
217 ret
= push_ucs2_talloc(mem_ctx
, &user
, user_in
, &user_byte_len
);
219 DEBUG(0, ("push_uss2_talloc() for user failed)\n"));
220 talloc_free(mem_ctx
);
224 ret
= push_ucs2_talloc(mem_ctx
, &domain
, domain_in
, &domain_byte_len
);
226 DEBUG(0, ("push_ucs2_talloc() for domain failed\n"));
227 talloc_free(mem_ctx
);
231 SMB_ASSERT(user_byte_len
>= 2);
232 SMB_ASSERT(domain_byte_len
>= 2);
234 /* We don't want null termination */
235 user_byte_len
= user_byte_len
- 2;
236 domain_byte_len
= domain_byte_len
- 2;
238 hmac_md5_init_limK_to_64(owf
, 16, &ctx
);
239 hmac_md5_update((uint8_t *)user
, user_byte_len
, &ctx
);
240 hmac_md5_update((uint8_t *)domain
, domain_byte_len
, &ctx
);
241 hmac_md5_final(kr_buf
, &ctx
);
243 #ifdef DEBUG_PASSWORD
244 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
245 dump_data(100, (uint8_t *)user
, user_byte_len
);
246 dump_data(100, (uint8_t *)domain
, domain_byte_len
);
247 dump_data(100, owf
, 16);
248 dump_data(100, kr_buf
, 16);
251 talloc_free(mem_ctx
);
255 /* Does the des encryption from the NT or LM MD4 hash. */
256 void SMBOWFencrypt(const uint8_t passwd
[16], const uint8_t *c8
, uint8_t p24
[24])
262 memcpy(p21
, passwd
, 16);
266 /* Does the des encryption. */
268 void SMBNTencrypt_hash(const uint8_t nt_hash
[16], const uint8_t *c8
, uint8_t *p24
)
273 memcpy(p21
, nt_hash
, 16);
274 SMBOWFencrypt(p21
, c8
, p24
);
276 #ifdef DEBUG_PASSWORD
277 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
278 dump_data(100, p21
, 16);
279 dump_data(100, c8
, 8);
280 dump_data(100, p24
, 24);
284 /* Does the NT MD4 hash then des encryption. Plaintext version of the above. */
286 void SMBNTencrypt(const char *passwd
, const uint8_t *c8
, uint8_t *p24
)
289 E_md4hash(passwd
, nt_hash
);
290 SMBNTencrypt_hash(nt_hash
, c8
, p24
);
294 /* Does the md5 encryption from the Key Response for NTLMv2. */
295 void SMBOWFencrypt_ntv2(const uint8_t kr
[16],
296 const DATA_BLOB
*srv_chal
,
297 const DATA_BLOB
*smbcli_chal
,
298 uint8_t resp_buf
[16])
302 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
303 hmac_md5_update(srv_chal
->data
, srv_chal
->length
, &ctx
);
304 hmac_md5_update(smbcli_chal
->data
, smbcli_chal
->length
, &ctx
);
305 hmac_md5_final(resp_buf
, &ctx
);
307 #ifdef DEBUG_PASSWORD
308 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
309 dump_data(100, srv_chal
->data
, srv_chal
->length
);
310 dump_data(100, smbcli_chal
->data
, smbcli_chal
->length
);
311 dump_data(100, resp_buf
, 16);
315 void SMBsesskeygen_ntv2(const uint8_t kr
[16],
316 const uint8_t * nt_resp
, uint8_t sess_key
[16])
318 /* a very nice, 128 bit, variable session key */
322 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
323 hmac_md5_update(nt_resp
, 16, &ctx
);
324 hmac_md5_final((uint8_t *)sess_key
, &ctx
);
326 #ifdef DEBUG_PASSWORD
327 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
328 dump_data(100, sess_key
, 16);
332 void SMBsesskeygen_ntv1(const uint8_t kr
[16], uint8_t sess_key
[16])
334 /* yes, this session key does not change - yes, this
335 is a problem - but it is 128 bits */
337 mdfour((uint8_t *)sess_key
, kr
, 16);
339 #ifdef DEBUG_PASSWORD
340 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
341 dump_data(100, sess_key
, 16);
345 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash
[16],
346 const uint8_t lm_resp
[24], /* only uses 8 */
347 uint8_t sess_key
[16])
349 /* Calculate the LM session key (effective length 40 bits,
350 but changes with each session) */
352 uint8_t partial_lm_hash
[14];
354 memcpy(partial_lm_hash
, lm_hash
, 8);
355 memset(partial_lm_hash
+ 8, 0xbd, 6);
357 des_crypt56(p24
, lm_resp
, partial_lm_hash
, 1);
358 des_crypt56(p24
+8, lm_resp
, partial_lm_hash
+ 7, 1);
360 memcpy(sess_key
, p24
, 16);
362 #ifdef DEBUG_PASSWORD
363 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
364 dump_data(100, sess_key
, 16);
368 DATA_BLOB
NTLMv2_generate_names_blob(TALLOC_CTX
*mem_ctx
,
369 const char *hostname
,
372 DATA_BLOB names_blob
= data_blob_talloc(mem_ctx
, NULL
, 0);
374 /* Deliberately ignore return here.. */
375 if (hostname
!= NULL
) {
376 (void)msrpc_gen(mem_ctx
, &names_blob
,
378 MsvAvNbDomainName
, domain
,
379 MsvAvNbComputerName
, hostname
,
382 (void)msrpc_gen(mem_ctx
, &names_blob
,
384 MsvAvNbDomainName
, domain
,
390 static DATA_BLOB
NTLMv2_generate_client_data(TALLOC_CTX
*mem_ctx
,
392 const DATA_BLOB
*names_blob
)
394 uint8_t client_chal
[8];
395 DATA_BLOB response
= data_blob(NULL
, 0);
396 uint8_t long_date
[8];
398 generate_random_buffer(client_chal
, sizeof(client_chal
));
400 push_nttime(long_date
, 0, nttime
);
402 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
404 /* Deliberately ignore return here.. */
405 (void)msrpc_gen(mem_ctx
, &response
, "ddbbdb",
406 0x00000101, /* Header */
408 long_date
, 8, /* Timestamp */
409 client_chal
, 8, /* client challenge */
411 names_blob
->data
, names_blob
->length
); /* End of name list */
416 static DATA_BLOB
NTLMv2_generate_response(TALLOC_CTX
*out_mem_ctx
,
417 const uint8_t ntlm_v2_hash
[16],
418 const DATA_BLOB
*server_chal
,
420 const DATA_BLOB
*names_blob
)
422 uint8_t ntlmv2_response
[16];
423 DATA_BLOB ntlmv2_client_data
;
424 DATA_BLOB final_response
;
426 TALLOC_CTX
*mem_ctx
= talloc_named(out_mem_ctx
, 0,
427 "NTLMv2_generate_response internal context");
430 return data_blob(NULL
, 0);
434 /* generate some data to pass into the response function - including
435 the hostname and domain name of the server */
436 ntlmv2_client_data
= NTLMv2_generate_client_data(mem_ctx
, nttime
, names_blob
);
438 /* Given that data, and the challenge from the server, generate a response */
439 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &ntlmv2_client_data
, ntlmv2_response
);
441 final_response
= data_blob_talloc(out_mem_ctx
, NULL
, sizeof(ntlmv2_response
) + ntlmv2_client_data
.length
);
443 memcpy(final_response
.data
, ntlmv2_response
, sizeof(ntlmv2_response
));
445 memcpy(final_response
.data
+sizeof(ntlmv2_response
),
446 ntlmv2_client_data
.data
, ntlmv2_client_data
.length
);
448 talloc_free(mem_ctx
);
450 return final_response
;
453 static DATA_BLOB
LMv2_generate_response(TALLOC_CTX
*mem_ctx
,
454 const uint8_t ntlm_v2_hash
[16],
455 const DATA_BLOB
*server_chal
)
457 uint8_t lmv2_response
[16];
458 DATA_BLOB lmv2_client_data
= data_blob_talloc(mem_ctx
, NULL
, 8);
459 DATA_BLOB final_response
= data_blob_talloc(mem_ctx
, NULL
,24);
462 /* client-supplied random data */
463 generate_random_buffer(lmv2_client_data
.data
, lmv2_client_data
.length
);
465 /* Given that data, and the challenge from the server, generate a response */
466 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &lmv2_client_data
, lmv2_response
);
467 memcpy(final_response
.data
, lmv2_response
, sizeof(lmv2_response
));
469 /* after the first 16 bytes is the random data we generated above,
470 so the server can verify us with it */
471 memcpy(final_response
.data
+sizeof(lmv2_response
),
472 lmv2_client_data
.data
, lmv2_client_data
.length
);
474 data_blob_free(&lmv2_client_data
);
476 return final_response
;
479 bool SMBNTLMv2encrypt_hash(TALLOC_CTX
*mem_ctx
,
480 const char *user
, const char *domain
, const uint8_t nt_hash
[16],
481 const DATA_BLOB
*server_chal
,
482 const NTTIME
*server_timestamp
,
483 const DATA_BLOB
*names_blob
,
484 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
485 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
487 uint8_t ntlm_v2_hash
[16];
489 /* We don't use the NT# directly. Instead we use it mashed up with
490 the username and domain.
491 This prevents username swapping during the auth exchange
493 if (!ntv2_owf_gen(nt_hash
, user
, domain
, ntlm_v2_hash
)) {
498 const NTTIME
*nttime
= server_timestamp
;
501 if (nttime
== NULL
) {
502 struct timeval tv_now
= timeval_current();
503 _now
= timeval_to_nttime(&tv_now
);
507 *nt_response
= NTLMv2_generate_response(mem_ctx
,
512 if (user_session_key
) {
513 *user_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
515 /* The NTLMv2 calculations also provide a session key, for signing etc later */
516 /* use only the first 16 bytes of nt_response for session key */
517 SMBsesskeygen_ntv2(ntlm_v2_hash
, nt_response
->data
, user_session_key
->data
);
524 if (server_timestamp
!= NULL
) {
525 *lm_response
= data_blob_talloc_zero(mem_ctx
, 24);
527 *lm_response
= LMv2_generate_response(mem_ctx
,
531 if (lm_session_key
) {
532 *lm_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
534 /* The NTLMv2 calculations also provide a session key, for signing etc later */
535 /* use only the first 16 bytes of lm_response for session key */
536 SMBsesskeygen_ntv2(ntlm_v2_hash
, lm_response
->data
, lm_session_key
->data
);
543 bool SMBNTLMv2encrypt(TALLOC_CTX
*mem_ctx
,
544 const char *user
, const char *domain
,
545 const char *password
,
546 const DATA_BLOB
*server_chal
,
547 const DATA_BLOB
*names_blob
,
548 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
549 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
552 E_md4hash(password
, nt_hash
);
554 return SMBNTLMv2encrypt_hash(mem_ctx
,
555 user
, domain
, nt_hash
,
556 server_chal
, NULL
, names_blob
,
557 lm_response
, nt_response
, lm_session_key
, user_session_key
);
560 NTSTATUS
NTLMv2_RESPONSE_verify_netlogon_creds(const char *account_name
,
561 const char *account_domain
,
562 const DATA_BLOB response
,
563 const struct netlogon_creds_CredentialState
*creds
,
564 const char *workgroup
)
566 TALLOC_CTX
*frame
= NULL
;
567 /* RespType + HiRespType */
568 static const char *magic
= "\x01\x01";
570 struct NTLMv2_RESPONSE v2_resp
;
571 enum ndr_err_code err
;
572 const struct AV_PAIR
*av_nb_cn
= NULL
;
573 const struct AV_PAIR
*av_nb_dn
= NULL
;
575 if (response
.length
< 48) {
577 * NTLMv2_RESPONSE has at least 48 bytes.
582 cmp
= memcmp(response
.data
+ 16, magic
, 2);
585 * It doesn't look like a valid NTLMv2_RESPONSE
590 frame
= talloc_stackframe();
592 err
= ndr_pull_struct_blob(&response
, frame
, &v2_resp
,
593 (ndr_pull_flags_fn_t
)ndr_pull_NTLMv2_RESPONSE
);
594 if (!NDR_ERR_CODE_IS_SUCCESS(err
)) {
596 status
= ndr_map_error2ntstatus(err
);
597 DEBUG(2,("Failed to parse NTLMv2_RESPONSE "
598 "length %u - %s - %s\n",
599 (unsigned)response
.length
,
600 ndr_map_error2string(err
),
602 dump_data(2, response
.data
, response
.length
);
608 NDR_PRINT_DEBUG(NTLMv2_RESPONSE
, &v2_resp
);
612 * Make sure the netbios computer name in the
613 * NTLMv2_RESPONSE matches the computer name
614 * in the secure channel credentials for workstation
617 * And the netbios domain name matches our
620 * This prevents workstations from requesting
621 * the session key of NTLMSSP sessions of clients
624 if (creds
->secure_channel_type
== SEC_CHAN_WKSTA
) {
625 av_nb_cn
= ndr_ntlmssp_find_av(&v2_resp
.Challenge
.AvPairs
,
626 MsvAvNbComputerName
);
627 av_nb_dn
= ndr_ntlmssp_find_av(&v2_resp
.Challenge
.AvPairs
,
631 if (av_nb_cn
!= NULL
) {
632 const char *v
= NULL
;
636 v
= av_nb_cn
->Value
.AvNbComputerName
;
638 a
= talloc_strdup(frame
, creds
->account_name
);
641 return NT_STATUS_NO_MEMORY
;
644 if (len
> 0 && a
[len
- 1] == '$') {
648 cmp
= strcasecmp_m(a
, v
);
650 DEBUG(2,("%s: NTLMv2_RESPONSE with "
651 "NbComputerName[%s] rejected "
653 "against SEC_CHAN_WKSTA[%s/%s] "
654 "in workgroup[%s]\n",
658 creds
->computer_name
,
662 return NT_STATUS_LOGON_FAILURE
;
665 if (av_nb_dn
!= NULL
) {
666 const char *v
= NULL
;
668 v
= av_nb_dn
->Value
.AvNbDomainName
;
670 cmp
= strcasecmp_m(workgroup
, v
);
672 DEBUG(2,("%s: NTLMv2_RESPONSE with "
673 "NbDomainName[%s] rejected "
675 "against SEC_CHAN_WKSTA[%s/%s] "
676 "in workgroup[%s]\n",
680 creds
->computer_name
,
684 return NT_STATUS_LOGON_FAILURE
;
692 /***********************************************************
693 encode a password buffer with a unicode password. The buffer
694 is filled with random data to make it harder to attack.
695 ************************************************************/
696 bool encode_pw_buffer(uint8_t buffer
[516], const char *password
, int string_flags
)
701 /* the incoming buffer can be any alignment. */
702 string_flags
|= STR_NOALIGN
;
704 new_pw_len
= push_string(new_pw
,
706 sizeof(new_pw
), string_flags
);
707 if (new_pw_len
== -1) {
711 memcpy(&buffer
[512 - new_pw_len
], new_pw
, new_pw_len
);
713 generate_random_buffer(buffer
, 512 - new_pw_len
);
716 * The length of the new password is in the last 4 bytes of
719 SIVAL(buffer
, 512, new_pw_len
);
725 /***********************************************************
726 decode a password buffer
727 *new_pw_len is the length in bytes of the possibly mulitbyte
728 returned password including termination.
729 ************************************************************/
731 bool decode_pw_buffer(TALLOC_CTX
*ctx
,
732 uint8_t in_buffer
[516],
735 charset_t string_charset
)
743 Warning !!! : This function is called from some rpc call.
744 The password IN the buffer may be a UNICODE string.
745 The password IN new_pwrd is an ASCII string
746 If you reuse that code somewhere else check first.
749 /* The length of the new password is in the last 4 bytes of the data buffer. */
751 byte_len
= IVAL(in_buffer
, 512);
753 #ifdef DEBUG_PASSWORD
754 dump_data(100, in_buffer
, 516);
757 /* Password cannot be longer than the size of the password buffer */
758 if ( (byte_len
< 0) || (byte_len
> 512)) {
759 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len
));
760 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
764 /* decode into the return buffer. */
765 if (!convert_string_talloc(ctx
, string_charset
, CH_UNIX
,
766 &in_buffer
[512 - byte_len
],
770 DEBUG(0, ("decode_pw_buffer: failed to convert incoming password\n"));
774 #ifdef DEBUG_PASSWORD
775 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
776 dump_data(100, (uint8_t *)*pp_new_pwrd
, *new_pw_len
);
777 DEBUG(100,("multibyte len:%lu\n", (unsigned long int)*new_pw_len
));
778 DEBUG(100,("original char len:%d\n", byte_len
/2));
784 /***********************************************************
785 Decode an arc4 encrypted password change buffer.
786 ************************************************************/
788 void encode_or_decode_arc4_passwd_buffer(unsigned char pw_buf
[532], const DATA_BLOB
*psession_key
)
791 unsigned char key_out
[16];
793 /* Confounder is last 16 bytes. */
796 MD5Update(&tctx
, &pw_buf
[516], 16);
797 MD5Update(&tctx
, psession_key
->data
, psession_key
->length
);
798 MD5Final(key_out
, &tctx
);
799 /* arc4 with key_out. */
800 arcfour_crypt(pw_buf
, key_out
, 516);
803 /***********************************************************
804 encode a password buffer with an already unicode password. The
805 rest of the buffer is filled with random data to make it harder to attack.
806 ************************************************************/
807 bool set_pw_in_buffer(uint8_t buffer
[516], const DATA_BLOB
*password
)
809 if (password
->length
> 512) {
813 memcpy(&buffer
[512 - password
->length
], password
->data
, password
->length
);
815 generate_random_buffer(buffer
, 512 - password
->length
);
818 * The length of the new password is in the last 4 bytes of
821 SIVAL(buffer
, 512, password
->length
);
825 /***********************************************************
826 decode a password buffer
827 *new_pw_size is the length in bytes of the extracted unicode password
828 ************************************************************/
829 bool extract_pw_from_buffer(TALLOC_CTX
*mem_ctx
,
830 uint8_t in_buffer
[516], DATA_BLOB
*new_pass
)
834 /* The length of the new password is in the last 4 bytes of the data buffer. */
836 byte_len
= IVAL(in_buffer
, 512);
838 #ifdef DEBUG_PASSWORD
839 dump_data(100, in_buffer
, 516);
842 /* Password cannot be longer than the size of the password buffer */
843 if ( (byte_len
< 0) || (byte_len
> 512)) {
847 *new_pass
= data_blob_talloc(mem_ctx
, &in_buffer
[512 - byte_len
], byte_len
);
849 if (!new_pass
->data
) {
857 /* encode a wkssvc_PasswordBuffer:
859 * similar to samr_CryptPasswordEx. Different: 8byte confounder (instead of
860 * 16byte), confounder in front of the 516 byte buffer (instead of after that
861 * buffer), calling MD5Update() first with session_key and then with confounder
862 * (vice versa in samr) - Guenther */
864 void encode_wkssvc_join_password_buffer(TALLOC_CTX
*mem_ctx
,
866 DATA_BLOB
*session_key
,
867 struct wkssvc_PasswordBuffer
**pwd_buf
)
871 struct wkssvc_PasswordBuffer
*my_pwd_buf
= NULL
;
872 DATA_BLOB confounded_session_key
;
873 int confounder_len
= 8;
874 uint8_t confounder
[8];
876 my_pwd_buf
= talloc_zero(mem_ctx
, struct wkssvc_PasswordBuffer
);
881 confounded_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
883 encode_pw_buffer(buffer
, pwd
, STR_UNICODE
);
885 generate_random_buffer((uint8_t *)confounder
, confounder_len
);
888 MD5Update(&ctx
, session_key
->data
, session_key
->length
);
889 MD5Update(&ctx
, confounder
, confounder_len
);
890 MD5Final(confounded_session_key
.data
, &ctx
);
892 arcfour_crypt_blob(buffer
, 516, &confounded_session_key
);
894 memcpy(&my_pwd_buf
->data
[0], confounder
, confounder_len
);
895 memcpy(&my_pwd_buf
->data
[8], buffer
, 516);
897 data_blob_free(&confounded_session_key
);
899 *pwd_buf
= my_pwd_buf
;
902 WERROR
decode_wkssvc_join_password_buffer(TALLOC_CTX
*mem_ctx
,
903 struct wkssvc_PasswordBuffer
*pwd_buf
,
904 DATA_BLOB
*session_key
,
911 DATA_BLOB confounded_session_key
;
913 int confounder_len
= 8;
914 uint8_t confounder
[8];
919 return WERR_INVALID_PASSWORD
;
922 if (session_key
->length
!= 16) {
923 DEBUG(10,("invalid session key\n"));
924 return WERR_INVALID_PASSWORD
;
927 confounded_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
929 memcpy(&confounder
, &pwd_buf
->data
[0], confounder_len
);
930 memcpy(&buffer
, &pwd_buf
->data
[8], 516);
933 MD5Update(&ctx
, session_key
->data
, session_key
->length
);
934 MD5Update(&ctx
, confounder
, confounder_len
);
935 MD5Final(confounded_session_key
.data
, &ctx
);
937 arcfour_crypt_blob(buffer
, 516, &confounded_session_key
);
939 if (!decode_pw_buffer(mem_ctx
, buffer
, pwd
, &pwd_len
, CH_UTF16
)) {
940 data_blob_free(&confounded_session_key
);
941 return WERR_INVALID_PASSWORD
;
944 data_blob_free(&confounded_session_key
);