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 #include "lib/crypto/gnutls_helpers.h"
32 #include <gnutls/gnutls.h>
33 #include <gnutls/crypto.h>
35 void SMBencrypt_hash(const uint8_t lm_hash
[16], const uint8_t *c8
, uint8_t p24
[24])
40 memcpy(p21
, lm_hash
, 16);
42 SMBOWFencrypt(p21
, c8
, p24
);
45 DEBUG(100,("SMBencrypt_hash: lm#, challenge, response\n"));
46 dump_data(100, p21
, 16);
47 dump_data(100, c8
, 8);
48 dump_data(100, p24
, 24);
53 This implements the X/Open SMB password encryption
54 It takes a password ('unix' string), a 8 byte "crypt key"
55 and puts 24 bytes of encrypted password into p24
57 Returns False if password must have been truncated to create LM hash
60 bool SMBencrypt(const char *passwd
, const uint8_t *c8
, uint8_t p24
[24])
65 ret
= E_deshash(passwd
, lm_hash
);
66 SMBencrypt_hash(lm_hash
, c8
, p24
);
71 * Creates the MD4 Hash of the users password in NT UNICODE.
72 * @param passwd password in 'unix' charset.
73 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
76 bool E_md4hash(const char *passwd
, uint8_t p16
[16])
82 ret
= push_ucs2_talloc(NULL
, &wpwd
, passwd
, &len
);
83 if (!ret
|| len
< 2) {
84 /* We don't want to return fixed data, as most callers
86 mdfour(p16
, (const uint8_t *)passwd
, strlen(passwd
));
91 mdfour(p16
, (const uint8_t *)wpwd
, len
);
98 * Creates the MD5 Hash of a combination of 16 byte salt and 16 byte NT hash.
99 * @param 16 byte salt.
100 * @param 16 byte NT hash.
101 * @param 16 byte return hashed with md5, caller allocated 16 byte buffer
104 void E_md5hash(const uint8_t salt
[16], const uint8_t nthash
[16], uint8_t hash_out
[16])
106 gnutls_hash_hd_t hash_hnd
= NULL
;
109 rc
= gnutls_hash_init(&hash_hnd
, GNUTLS_DIG_MD5
);
114 rc
= gnutls_hash(hash_hnd
, salt
, 16);
116 gnutls_hash_deinit(hash_hnd
, NULL
);
119 rc
= gnutls_hash(hash_hnd
, nthash
, 16);
121 gnutls_hash_deinit(hash_hnd
, NULL
);
124 gnutls_hash_deinit(hash_hnd
, hash_out
);
131 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
132 * @param passwd password in 'unix' charset.
133 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
134 * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
135 * @note p16 is filled in regardless
138 bool E_deshash(const char *passwd
, uint8_t p16
[16])
142 TALLOC_CTX
*frame
= talloc_stackframe();
144 size_t converted_size
;
150 tmpbuf
= strupper_talloc(frame
, passwd
);
151 if (tmpbuf
== NULL
) {
152 /* Too many callers don't check this result, we need to fill in the buffer with something */
153 strlcpy((char *)dospwd
, passwd
? passwd
: "", sizeof(dospwd
));
161 ret
= convert_string_error(CH_UNIX
, CH_DOS
, tmpbuf
, strlen(tmpbuf
), dospwd
, sizeof(dospwd
), &converted_size
);
164 /* Only the first 14 chars are considered, password need not
165 * be null terminated. We do this in the error and success
166 * case to avoid returning a fixed 'password' buffer, but
167 * callers should not use it when E_deshash returns false */
169 E_P16((const uint8_t *)dospwd
, p16
);
177 * Creates the MD4 and DES (LM) Hash of the users password.
178 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
179 * @param passwd password in 'unix' charset.
180 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
181 * @param p16 return password hashed with des, caller allocated 16 byte buffer
184 /* Does both the NT and LM owfs of a user's password */
185 void nt_lm_owf_gen(const char *pwd
, uint8_t nt_p16
[16], uint8_t p16
[16])
187 /* Calculate the MD4 hash (NT compatible) of the password */
188 memset(nt_p16
, '\0', 16);
189 E_md4hash(pwd
, nt_p16
);
191 #ifdef DEBUG_PASSWORD
192 DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
193 dump_data(120, (const uint8_t *)pwd
, strlen(pwd
));
194 dump_data(100, nt_p16
, 16);
197 E_deshash(pwd
, (uint8_t *)p16
);
199 #ifdef DEBUG_PASSWORD
200 DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
201 dump_data(120, (const uint8_t *)pwd
, strlen(pwd
));
202 dump_data(100, p16
, 16);
206 /* Does both the NTLMv2 owfs of a user's password */
207 bool ntv2_owf_gen(const uint8_t owf
[16],
208 const char *user_in
, const char *domain_in
,
213 size_t user_byte_len
;
214 size_t domain_byte_len
;
215 gnutls_hmac_hd_t hmac_hnd
= NULL
;
218 TALLOC_CTX
*mem_ctx
= talloc_init("ntv2_owf_gen for %s\\%s", domain_in
, user_in
);
232 user_in
= strupper_talloc(mem_ctx
, user_in
);
233 if (user_in
== NULL
) {
234 talloc_free(mem_ctx
);
238 ok
= push_ucs2_talloc(mem_ctx
, &user
, user_in
, &user_byte_len
);
240 DEBUG(0, ("push_uss2_talloc() for user failed)\n"));
241 talloc_free(mem_ctx
);
245 ok
= push_ucs2_talloc(mem_ctx
, &domain
, domain_in
, &domain_byte_len
);
247 DEBUG(0, ("push_ucs2_talloc() for domain failed\n"));
248 talloc_free(mem_ctx
);
252 SMB_ASSERT(user_byte_len
>= 2);
253 SMB_ASSERT(domain_byte_len
>= 2);
255 /* We don't want null termination */
256 user_byte_len
= user_byte_len
- 2;
257 domain_byte_len
= domain_byte_len
- 2;
259 rc
= gnutls_hmac_init(&hmac_hnd
,
268 rc
= gnutls_hmac(hmac_hnd
, user
, user_byte_len
);
270 gnutls_hmac_deinit(hmac_hnd
, NULL
);
274 rc
= gnutls_hmac(hmac_hnd
, domain
, domain_byte_len
);
276 gnutls_hmac_deinit(hmac_hnd
, NULL
);
281 gnutls_hmac_deinit(hmac_hnd
, kr_buf
);
283 #ifdef DEBUG_PASSWORD
284 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
285 dump_data(100, (uint8_t *)user
, user_byte_len
);
286 dump_data(100, (uint8_t *)domain
, domain_byte_len
);
287 dump_data(100, owf
, 16);
288 dump_data(100, kr_buf
, 16);
293 talloc_free(mem_ctx
);
297 /* Does the des encryption from the NT or LM MD4 hash. */
298 void SMBOWFencrypt(const uint8_t passwd
[16], const uint8_t *c8
, uint8_t p24
[24])
304 memcpy(p21
, passwd
, 16);
308 /* Does the des encryption. */
310 void SMBNTencrypt_hash(const uint8_t nt_hash
[16], const uint8_t *c8
, uint8_t *p24
)
315 memcpy(p21
, nt_hash
, 16);
316 SMBOWFencrypt(p21
, c8
, p24
);
318 #ifdef DEBUG_PASSWORD
319 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
320 dump_data(100, p21
, 16);
321 dump_data(100, c8
, 8);
322 dump_data(100, p24
, 24);
326 /* Does the NT MD4 hash then des encryption. Plaintext version of the above. */
328 void SMBNTencrypt(const char *passwd
, const uint8_t *c8
, uint8_t *p24
)
331 E_md4hash(passwd
, nt_hash
);
332 SMBNTencrypt_hash(nt_hash
, c8
, p24
);
336 /* Does the md5 encryption from the Key Response for NTLMv2. */
337 void SMBOWFencrypt_ntv2(const uint8_t kr
[16],
338 const DATA_BLOB
*srv_chal
,
339 const DATA_BLOB
*smbcli_chal
,
340 uint8_t resp_buf
[16])
342 gnutls_hmac_hd_t hmac_hnd
= NULL
;
345 rc
= gnutls_hmac_init(&hmac_hnd
,
353 rc
= gnutls_hmac(hmac_hnd
, srv_chal
->data
, srv_chal
->length
);
357 rc
= gnutls_hmac(hmac_hnd
, smbcli_chal
->data
, smbcli_chal
->length
);
359 gnutls_hmac_deinit(hmac_hnd
, NULL
);
363 gnutls_hmac_deinit(hmac_hnd
, resp_buf
);
365 #ifdef DEBUG_PASSWORD
366 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
367 dump_data(100, srv_chal
->data
, srv_chal
->length
);
368 dump_data(100, smbcli_chal
->data
, smbcli_chal
->length
);
369 dump_data(100, resp_buf
, 16);
373 void SMBsesskeygen_ntv2(const uint8_t kr
[16],
374 const uint8_t * nt_resp
, uint8_t sess_key
[16])
376 /* a very nice, 128 bit, variable session key */
377 gnutls_hmac_fast(GNUTLS_MAC_MD5
,
384 #ifdef DEBUG_PASSWORD
385 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
386 dump_data(100, sess_key
, 16);
390 void SMBsesskeygen_ntv1(const uint8_t kr
[16], uint8_t sess_key
[16])
392 /* yes, this session key does not change - yes, this
393 is a problem - but it is 128 bits */
395 mdfour((uint8_t *)sess_key
, kr
, 16);
397 #ifdef DEBUG_PASSWORD
398 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
399 dump_data(100, sess_key
, 16);
403 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash
[16],
404 const uint8_t lm_resp
[24], /* only uses 8 */
405 uint8_t sess_key
[16])
407 /* Calculate the LM session key (effective length 40 bits,
408 but changes with each session) */
410 uint8_t partial_lm_hash
[14];
412 memcpy(partial_lm_hash
, lm_hash
, 8);
413 memset(partial_lm_hash
+ 8, 0xbd, 6);
415 des_crypt56(p24
, lm_resp
, partial_lm_hash
, 1);
416 des_crypt56(p24
+8, lm_resp
, partial_lm_hash
+ 7, 1);
418 memcpy(sess_key
, p24
, 16);
420 #ifdef DEBUG_PASSWORD
421 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
422 dump_data(100, sess_key
, 16);
426 DATA_BLOB
NTLMv2_generate_names_blob(TALLOC_CTX
*mem_ctx
,
427 const char *hostname
,
430 DATA_BLOB names_blob
= data_blob_talloc(mem_ctx
, NULL
, 0);
432 /* Deliberately ignore return here.. */
433 if (hostname
!= NULL
) {
434 (void)msrpc_gen(mem_ctx
, &names_blob
,
436 MsvAvNbDomainName
, domain
,
437 MsvAvNbComputerName
, hostname
,
440 (void)msrpc_gen(mem_ctx
, &names_blob
,
442 MsvAvNbDomainName
, domain
,
448 static DATA_BLOB
NTLMv2_generate_client_data(TALLOC_CTX
*mem_ctx
,
450 const DATA_BLOB
*names_blob
)
452 uint8_t client_chal
[8];
453 DATA_BLOB response
= data_blob(NULL
, 0);
454 uint8_t long_date
[8];
456 generate_random_buffer(client_chal
, sizeof(client_chal
));
458 push_nttime(long_date
, 0, nttime
);
460 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
462 /* Deliberately ignore return here.. */
463 (void)msrpc_gen(mem_ctx
, &response
, "ddbbdb",
464 0x00000101, /* Header */
466 long_date
, 8, /* Timestamp */
467 client_chal
, 8, /* client challenge */
469 names_blob
->data
, names_blob
->length
); /* End of name list */
474 static DATA_BLOB
NTLMv2_generate_response(TALLOC_CTX
*out_mem_ctx
,
475 const uint8_t ntlm_v2_hash
[16],
476 const DATA_BLOB
*server_chal
,
478 const DATA_BLOB
*names_blob
)
480 uint8_t ntlmv2_response
[16];
481 DATA_BLOB ntlmv2_client_data
;
482 DATA_BLOB final_response
;
484 TALLOC_CTX
*mem_ctx
= talloc_named(out_mem_ctx
, 0,
485 "NTLMv2_generate_response internal context");
488 return data_blob(NULL
, 0);
492 /* generate some data to pass into the response function - including
493 the hostname and domain name of the server */
494 ntlmv2_client_data
= NTLMv2_generate_client_data(mem_ctx
, nttime
, names_blob
);
496 /* Given that data, and the challenge from the server, generate a response */
497 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &ntlmv2_client_data
, ntlmv2_response
);
499 final_response
= data_blob_talloc(out_mem_ctx
, NULL
, sizeof(ntlmv2_response
) + ntlmv2_client_data
.length
);
501 memcpy(final_response
.data
, ntlmv2_response
, sizeof(ntlmv2_response
));
503 memcpy(final_response
.data
+sizeof(ntlmv2_response
),
504 ntlmv2_client_data
.data
, ntlmv2_client_data
.length
);
506 talloc_free(mem_ctx
);
508 return final_response
;
511 static DATA_BLOB
LMv2_generate_response(TALLOC_CTX
*mem_ctx
,
512 const uint8_t ntlm_v2_hash
[16],
513 const DATA_BLOB
*server_chal
)
515 uint8_t lmv2_response
[16];
516 DATA_BLOB lmv2_client_data
= data_blob_talloc(mem_ctx
, NULL
, 8);
517 DATA_BLOB final_response
= data_blob_talloc(mem_ctx
, NULL
,24);
520 /* client-supplied random data */
521 generate_random_buffer(lmv2_client_data
.data
, lmv2_client_data
.length
);
523 /* Given that data, and the challenge from the server, generate a response */
524 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &lmv2_client_data
, lmv2_response
);
525 memcpy(final_response
.data
, lmv2_response
, sizeof(lmv2_response
));
527 /* after the first 16 bytes is the random data we generated above,
528 so the server can verify us with it */
529 memcpy(final_response
.data
+sizeof(lmv2_response
),
530 lmv2_client_data
.data
, lmv2_client_data
.length
);
532 data_blob_free(&lmv2_client_data
);
534 return final_response
;
537 bool SMBNTLMv2encrypt_hash(TALLOC_CTX
*mem_ctx
,
538 const char *user
, const char *domain
, const uint8_t nt_hash
[16],
539 const DATA_BLOB
*server_chal
,
540 const NTTIME
*server_timestamp
,
541 const DATA_BLOB
*names_blob
,
542 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
543 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
545 uint8_t ntlm_v2_hash
[16];
547 /* We don't use the NT# directly. Instead we use it mashed up with
548 the username and domain.
549 This prevents username swapping during the auth exchange
551 if (!ntv2_owf_gen(nt_hash
, user
, domain
, ntlm_v2_hash
)) {
556 const NTTIME
*nttime
= server_timestamp
;
559 if (nttime
== NULL
) {
560 struct timeval tv_now
= timeval_current();
561 _now
= timeval_to_nttime(&tv_now
);
565 *nt_response
= NTLMv2_generate_response(mem_ctx
,
570 if (user_session_key
) {
571 *user_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
573 /* The NTLMv2 calculations also provide a session key, for signing etc later */
574 /* use only the first 16 bytes of nt_response for session key */
575 SMBsesskeygen_ntv2(ntlm_v2_hash
, nt_response
->data
, user_session_key
->data
);
582 if (server_timestamp
!= NULL
) {
583 *lm_response
= data_blob_talloc_zero(mem_ctx
, 24);
585 *lm_response
= LMv2_generate_response(mem_ctx
,
589 if (lm_session_key
) {
590 *lm_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
592 /* The NTLMv2 calculations also provide a session key, for signing etc later */
593 /* use only the first 16 bytes of lm_response for session key */
594 SMBsesskeygen_ntv2(ntlm_v2_hash
, lm_response
->data
, lm_session_key
->data
);
601 bool SMBNTLMv2encrypt(TALLOC_CTX
*mem_ctx
,
602 const char *user
, const char *domain
,
603 const char *password
,
604 const DATA_BLOB
*server_chal
,
605 const DATA_BLOB
*names_blob
,
606 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
607 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
610 E_md4hash(password
, nt_hash
);
612 return SMBNTLMv2encrypt_hash(mem_ctx
,
613 user
, domain
, nt_hash
,
614 server_chal
, NULL
, names_blob
,
615 lm_response
, nt_response
, lm_session_key
, user_session_key
);
618 NTSTATUS
NTLMv2_RESPONSE_verify_netlogon_creds(const char *account_name
,
619 const char *account_domain
,
620 const DATA_BLOB response
,
621 const struct netlogon_creds_CredentialState
*creds
,
622 const char *workgroup
)
624 TALLOC_CTX
*frame
= NULL
;
625 /* RespType + HiRespType */
626 static const char *magic
= "\x01\x01";
628 struct NTLMv2_RESPONSE v2_resp
;
629 enum ndr_err_code err
;
630 const struct AV_PAIR
*av_nb_cn
= NULL
;
631 const struct AV_PAIR
*av_nb_dn
= NULL
;
633 if (response
.length
< 48) {
635 * NTLMv2_RESPONSE has at least 48 bytes.
640 cmp
= memcmp(response
.data
+ 16, magic
, 2);
643 * It doesn't look like a valid NTLMv2_RESPONSE
648 frame
= talloc_stackframe();
650 err
= ndr_pull_struct_blob(&response
, frame
, &v2_resp
,
651 (ndr_pull_flags_fn_t
)ndr_pull_NTLMv2_RESPONSE
);
652 if (!NDR_ERR_CODE_IS_SUCCESS(err
)) {
654 status
= ndr_map_error2ntstatus(err
);
655 DEBUG(2,("Failed to parse NTLMv2_RESPONSE "
656 "length %u - %s - %s\n",
657 (unsigned)response
.length
,
658 ndr_map_error2string(err
),
660 dump_data(2, response
.data
, response
.length
);
666 NDR_PRINT_DEBUG(NTLMv2_RESPONSE
, &v2_resp
);
670 * Make sure the netbios computer name in the
671 * NTLMv2_RESPONSE matches the computer name
672 * in the secure channel credentials for workstation
675 * And the netbios domain name matches our
678 * This prevents workstations from requesting
679 * the session key of NTLMSSP sessions of clients
682 if (creds
->secure_channel_type
== SEC_CHAN_WKSTA
) {
683 av_nb_cn
= ndr_ntlmssp_find_av(&v2_resp
.Challenge
.AvPairs
,
684 MsvAvNbComputerName
);
685 av_nb_dn
= ndr_ntlmssp_find_av(&v2_resp
.Challenge
.AvPairs
,
689 if (av_nb_cn
!= NULL
) {
690 const char *v
= NULL
;
694 v
= av_nb_cn
->Value
.AvNbComputerName
;
696 a
= talloc_strdup(frame
, creds
->account_name
);
699 return NT_STATUS_NO_MEMORY
;
702 if (len
> 0 && a
[len
- 1] == '$') {
706 cmp
= strcasecmp_m(a
, v
);
708 DEBUG(2,("%s: NTLMv2_RESPONSE with "
709 "NbComputerName[%s] rejected "
711 "against SEC_CHAN_WKSTA[%s/%s] "
712 "in workgroup[%s]\n",
716 creds
->computer_name
,
720 return NT_STATUS_LOGON_FAILURE
;
723 if (av_nb_dn
!= NULL
) {
724 const char *v
= NULL
;
726 v
= av_nb_dn
->Value
.AvNbDomainName
;
728 cmp
= strcasecmp_m(workgroup
, v
);
730 DEBUG(2,("%s: NTLMv2_RESPONSE with "
731 "NbDomainName[%s] rejected "
733 "against SEC_CHAN_WKSTA[%s/%s] "
734 "in workgroup[%s]\n",
738 creds
->computer_name
,
742 return NT_STATUS_LOGON_FAILURE
;
750 /***********************************************************
751 encode a password buffer with a unicode password. The buffer
752 is filled with random data to make it harder to attack.
753 ************************************************************/
754 bool encode_pw_buffer(uint8_t buffer
[516], const char *password
, int string_flags
)
759 /* the incoming buffer can be any alignment. */
760 string_flags
|= STR_NOALIGN
;
762 new_pw_len
= push_string(new_pw
,
764 sizeof(new_pw
), string_flags
);
765 if (new_pw_len
== -1) {
769 memcpy(&buffer
[512 - new_pw_len
], new_pw
, new_pw_len
);
771 generate_random_buffer(buffer
, 512 - new_pw_len
);
774 * The length of the new password is in the last 4 bytes of
777 SIVAL(buffer
, 512, new_pw_len
);
783 /***********************************************************
784 decode a password buffer
785 *new_pw_len is the length in bytes of the possibly mulitbyte
786 returned password including termination.
787 ************************************************************/
789 bool decode_pw_buffer(TALLOC_CTX
*ctx
,
790 uint8_t in_buffer
[516],
793 charset_t string_charset
)
801 Warning !!! : This function is called from some rpc call.
802 The password IN the buffer may be a UNICODE string.
803 The password IN new_pwrd is an ASCII string
804 If you reuse that code somewhere else check first.
807 /* The length of the new password is in the last 4 bytes of the data buffer. */
809 byte_len
= IVAL(in_buffer
, 512);
811 #ifdef DEBUG_PASSWORD
812 dump_data(100, in_buffer
, 516);
815 /* Password cannot be longer than the size of the password buffer */
816 if ( (byte_len
< 0) || (byte_len
> 512)) {
817 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len
));
818 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
822 /* decode into the return buffer. */
823 if (!convert_string_talloc(ctx
, string_charset
, CH_UNIX
,
824 &in_buffer
[512 - byte_len
],
828 DEBUG(0, ("decode_pw_buffer: failed to convert incoming password\n"));
832 #ifdef DEBUG_PASSWORD
833 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
834 dump_data(100, (uint8_t *)*pp_new_pwrd
, *new_pw_len
);
835 DEBUG(100,("multibyte len:%lu\n", (unsigned long int)*new_pw_len
));
836 DEBUG(100,("original char len:%d\n", byte_len
/2));
842 /***********************************************************
843 Decode an arc4 encrypted password change buffer.
844 ************************************************************/
846 void encode_or_decode_arc4_passwd_buffer(unsigned char pw_buf
[532], const DATA_BLOB
*psession_key
)
848 gnutls_hash_hd_t hash_hnd
= NULL
;
849 unsigned char key_out
[16];
852 /* Confounder is last 16 bytes. */
854 rc
= gnutls_hash_init(&hash_hnd
, GNUTLS_DIG_MD5
);
859 rc
= gnutls_hash(hash_hnd
, &pw_buf
[516], 16);
861 gnutls_hash_deinit(hash_hnd
, NULL
);
864 rc
= gnutls_hash(hash_hnd
, psession_key
->data
, psession_key
->length
);
866 gnutls_hash_deinit(hash_hnd
, NULL
);
869 gnutls_hash_deinit(hash_hnd
, key_out
);
871 /* arc4 with key_out. */
872 arcfour_crypt(pw_buf
, key_out
, 516);
880 /***********************************************************
881 encode a password buffer with an already unicode password. The
882 rest of the buffer is filled with random data to make it harder to attack.
883 ************************************************************/
884 bool set_pw_in_buffer(uint8_t buffer
[516], const DATA_BLOB
*password
)
886 if (password
->length
> 512) {
890 memcpy(&buffer
[512 - password
->length
], password
->data
, password
->length
);
892 generate_random_buffer(buffer
, 512 - password
->length
);
895 * The length of the new password is in the last 4 bytes of
898 SIVAL(buffer
, 512, password
->length
);
902 /***********************************************************
903 decode a password buffer
904 *new_pw_size is the length in bytes of the extracted unicode password
905 ************************************************************/
906 bool extract_pw_from_buffer(TALLOC_CTX
*mem_ctx
,
907 uint8_t in_buffer
[516], DATA_BLOB
*new_pass
)
911 /* The length of the new password is in the last 4 bytes of the data buffer. */
913 byte_len
= IVAL(in_buffer
, 512);
915 #ifdef DEBUG_PASSWORD
916 dump_data(100, in_buffer
, 516);
919 /* Password cannot be longer than the size of the password buffer */
920 if ( (byte_len
< 0) || (byte_len
> 512)) {
924 *new_pass
= data_blob_talloc(mem_ctx
, &in_buffer
[512 - byte_len
], byte_len
);
926 if (!new_pass
->data
) {
934 /* encode a wkssvc_PasswordBuffer:
936 * similar to samr_CryptPasswordEx. Different: 8byte confounder (instead of
937 * 16byte), confounder in front of the 516 byte buffer (instead of after that
938 * buffer), calling MD5Update() first with session_key and then with confounder
939 * (vice versa in samr) - Guenther */
941 void encode_wkssvc_join_password_buffer(TALLOC_CTX
*mem_ctx
,
943 DATA_BLOB
*session_key
,
944 struct wkssvc_PasswordBuffer
**pwd_buf
)
947 gnutls_hash_hd_t hash_hnd
= NULL
;
948 struct wkssvc_PasswordBuffer
*my_pwd_buf
= NULL
;
949 DATA_BLOB confounded_session_key
;
950 int confounder_len
= 8;
951 uint8_t confounder
[8];
954 my_pwd_buf
= talloc_zero(mem_ctx
, struct wkssvc_PasswordBuffer
);
959 confounded_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
961 encode_pw_buffer(buffer
, pwd
, STR_UNICODE
);
963 generate_random_buffer((uint8_t *)confounder
, confounder_len
);
965 rc
= gnutls_hash_init(&hash_hnd
, GNUTLS_DIG_MD5
);
970 rc
= gnutls_hash(hash_hnd
, session_key
->data
, session_key
->length
);
972 gnutls_hash_deinit(hash_hnd
, NULL
);
975 rc
= gnutls_hash(hash_hnd
, confounder
, confounder_len
);
977 gnutls_hash_deinit(hash_hnd
, NULL
);
980 gnutls_hash_deinit(hash_hnd
, confounded_session_key
.data
);
982 arcfour_crypt_blob(buffer
, 516, &confounded_session_key
);
984 memcpy(&my_pwd_buf
->data
[0], confounder
, confounder_len
);
985 ZERO_ARRAY(confounder
);
986 memcpy(&my_pwd_buf
->data
[8], buffer
, 516);
989 data_blob_clear_free(&confounded_session_key
);
991 *pwd_buf
= my_pwd_buf
;
997 WERROR
decode_wkssvc_join_password_buffer(TALLOC_CTX
*mem_ctx
,
998 struct wkssvc_PasswordBuffer
*pwd_buf
,
999 DATA_BLOB
*session_key
,
1002 gnutls_hash_hd_t hash_hnd
= NULL
;
1003 uint8_t buffer
[516];
1009 DATA_BLOB confounded_session_key
;
1011 int confounder_len
= 8;
1012 uint8_t confounder
[8];
1017 return WERR_INVALID_PASSWORD
;
1020 if (session_key
->length
!= 16) {
1021 DEBUG(10,("invalid session key\n"));
1022 return WERR_INVALID_PASSWORD
;
1025 confounded_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
1027 memcpy(&confounder
, &pwd_buf
->data
[0], confounder_len
);
1028 memcpy(&buffer
, &pwd_buf
->data
[8], 516);
1030 rc
= gnutls_hash_init(&hash_hnd
, GNUTLS_DIG_MD5
);
1032 result
= gnutls_error_to_werror(rc
, WERR_CONTENT_BLOCKED
);
1036 rc
= gnutls_hash(hash_hnd
, session_key
->data
, session_key
->length
);
1038 gnutls_hash_deinit(hash_hnd
, NULL
);
1039 result
= gnutls_error_to_werror(rc
, WERR_CONTENT_BLOCKED
);
1042 rc
= gnutls_hash(hash_hnd
, confounder
, confounder_len
);
1044 gnutls_hash_deinit(hash_hnd
, NULL
);
1045 result
= gnutls_error_to_werror(rc
, WERR_CONTENT_BLOCKED
);
1048 gnutls_hash_deinit(hash_hnd
, confounded_session_key
.data
);
1050 arcfour_crypt_blob(buffer
, 516, &confounded_session_key
);
1052 ok
= decode_pw_buffer(mem_ctx
, buffer
, pwd
, &pwd_len
, CH_UTF16
);
1054 ZERO_ARRAY(confounder
);
1057 data_blob_clear_free(&confounded_session_key
);
1060 result
= WERR_INVALID_PASSWORD
;