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 "auth/ntlmssp/ntlmssp.h"
27 #include "auth/ntlmssp/msrpc_parse.h"
28 #include "../lib/crypto/crypto.h"
29 #include "libcli/auth/libcli_auth.h"
32 This implements the X/Open SMB password encryption
33 It takes a password ('unix' string), a 8 byte "crypt key"
34 and puts 24 bytes of encrypted password into p24
36 Returns false if password must have been truncated to create LM hash
38 bool SMBencrypt(const char *passwd
, const uint8_t *c8
, uint8_t p24
[24])
44 ret
= E_deshash(passwd
, p21
);
46 SMBOWFencrypt(p21
, c8
, p24
);
49 DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
50 dump_data(100, p21
, 16);
51 dump_data(100, c8
, 8);
52 dump_data(100, p24
, 24);
59 * Creates the MD4 Hash of the users password in NT UNICODE.
60 * @param passwd password in 'unix' charset.
61 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
64 bool E_md4hash(const char *passwd
, uint8_t p16
[16])
70 ret
= push_ucs2_talloc(NULL
, &wpwd
, passwd
, &len
);
71 if (!ret
|| len
< 2) {
72 /* We don't want to return fixed data, as most callers
74 mdfour(p16
, (const uint8_t *)passwd
, strlen(passwd
));
79 mdfour(p16
, (const uint8_t *)wpwd
, len
);
86 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
87 * @param passwd password in 'unix' charset.
88 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
89 * @return false if password was > 14 characters, and therefore may be incorrect, otherwise true
90 * @note p16 is filled in regardless
93 bool E_deshash(const char *passwd
, uint8_t p16
[16])
99 /* Password must be converted to DOS charset - null terminated, uppercase. */
100 push_string(dospwd
, passwd
, sizeof(dospwd
), STR_ASCII
|STR_UPPER
|STR_TERMINATE
);
102 /* Only the first 14 chars are considered, password need not be null terminated. */
103 E_P16((const uint8_t *)dospwd
, p16
);
105 if (strlen(dospwd
) > 14) {
114 /* Does both the NTLMv2 owfs of a user's password */
115 bool ntv2_owf_gen(const uint8_t owf
[16],
116 const char *user_in
, const char *domain_in
,
117 bool upper_case_domain
, /* Transform the domain into UPPER case */
122 size_t user_byte_len
;
123 size_t domain_byte_len
;
127 TALLOC_CTX
*mem_ctx
= talloc_init("ntv2_owf_gen for %s\\%s", domain_in
, user_in
);
141 user_in
= strupper_talloc(mem_ctx
, user_in
);
142 if (user_in
== NULL
) {
143 talloc_free(mem_ctx
);
147 if (upper_case_domain
) {
148 domain_in
= strupper_talloc(mem_ctx
, domain_in
);
149 if (domain_in
== NULL
) {
150 talloc_free(mem_ctx
);
155 ret
= push_ucs2_talloc(mem_ctx
, &user
, user_in
, &user_byte_len
);
157 DEBUG(0, ("push_uss2_talloc() for user returned -1 (probably talloc() failure)\n"));
158 talloc_free(mem_ctx
);
162 ret
= push_ucs2_talloc(mem_ctx
, &domain
, domain_in
, &domain_byte_len
);
164 DEBUG(0, ("push_ucs2_talloc() for domain returned -1 (probably talloc() failure)\n"));
165 talloc_free(mem_ctx
);
169 SMB_ASSERT(user_byte_len
>= 2);
170 SMB_ASSERT(domain_byte_len
>= 2);
172 /* We don't want null termination */
173 user_byte_len
= user_byte_len
- 2;
174 domain_byte_len
= domain_byte_len
- 2;
176 hmac_md5_init_limK_to_64(owf
, 16, &ctx
);
177 hmac_md5_update((const void *)user
, user_byte_len
, &ctx
);
178 hmac_md5_update((const void *)domain
, domain_byte_len
, &ctx
);
179 hmac_md5_final(kr_buf
, &ctx
);
181 #ifdef DEBUG_PASSWORD
182 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
183 dump_data(100, (const void *)user
, user_byte_len
);
184 dump_data(100, (const void *)domain
, domain_byte_len
);
185 dump_data(100, owf
, 16);
186 dump_data(100, kr_buf
, 16);
189 talloc_free(mem_ctx
);
193 /* Does the des encryption from the NT or LM MD4 hash. */
194 void SMBOWFencrypt(const uint8_t passwd
[16], const uint8_t *c8
, uint8_t p24
[24])
200 memcpy(p21
, passwd
, 16);
204 /* Does the NT MD4 hash then des encryption. */
206 void SMBNTencrypt(const char *passwd
, uint8_t *c8
, uint8_t *p24
)
212 E_md4hash(passwd
, p21
);
213 SMBOWFencrypt(p21
, c8
, p24
);
215 #ifdef DEBUG_PASSWORD
216 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
217 dump_data(100, p21
, 16);
218 dump_data(100, c8
, 8);
219 dump_data(100, p24
, 24);
223 /* Does the md5 encryption from the Key Response for NTLMv2. */
224 void SMBOWFencrypt_ntv2(const uint8_t kr
[16],
225 const DATA_BLOB
*srv_chal
,
226 const DATA_BLOB
*smbcli_chal
,
227 uint8_t resp_buf
[16])
231 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
232 hmac_md5_update(srv_chal
->data
, srv_chal
->length
, &ctx
);
233 hmac_md5_update(smbcli_chal
->data
, smbcli_chal
->length
, &ctx
);
234 hmac_md5_final(resp_buf
, &ctx
);
236 #ifdef DEBUG_PASSWORD
237 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, smbcli_chal, resp_buf\n"));
238 dump_data(100, srv_chal
->data
, srv_chal
->length
);
239 dump_data(100, smbcli_chal
->data
, smbcli_chal
->length
);
240 dump_data(100, resp_buf
, 16);
244 void SMBsesskeygen_ntv2(const uint8_t kr
[16],
245 const uint8_t * nt_resp
, uint8_t sess_key
[16])
247 /* a very nice, 128 bit, variable session key */
251 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
252 hmac_md5_update(nt_resp
, 16, &ctx
);
253 hmac_md5_final((uint8_t *)sess_key
, &ctx
);
255 #ifdef DEBUG_PASSWORD
256 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
257 dump_data(100, sess_key
, 16);
261 void SMBsesskeygen_ntv1(const uint8_t kr
[16], uint8_t sess_key
[16])
263 /* yes, this session key does not change - yes, this
264 is a problem - but it is 128 bits */
266 mdfour((uint8_t *)sess_key
, kr
, 16);
268 #ifdef DEBUG_PASSWORD
269 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
270 dump_data(100, sess_key
, 16);
274 void SMBsesskeygen_lm_sess_key(const uint8_t lm_hash
[16],
275 const uint8_t lm_resp
[24], /* only uses 8 */
276 uint8_t sess_key
[16])
278 /* Calculate the LM session key (effective length 40 bits,
279 but changes with each session) */
281 uint8_t partial_lm_hash
[14];
283 memcpy(partial_lm_hash
, lm_hash
, 8);
284 memset(partial_lm_hash
+ 8, 0xbd, 6);
286 des_crypt56(p24
, lm_resp
, partial_lm_hash
, 1);
287 des_crypt56(p24
+8, lm_resp
, partial_lm_hash
+ 7, 1);
289 memcpy(sess_key
, p24
, 16);
291 #ifdef DEBUG_PASSWORD
292 DEBUG(100, ("SMBsesskeygen_lm_sess_key: \n"));
293 dump_data(100, sess_key
, 16);
297 DATA_BLOB
NTLMv2_generate_names_blob(TALLOC_CTX
*mem_ctx
,
298 const char *hostname
,
301 DATA_BLOB names_blob
= data_blob_talloc(mem_ctx
, NULL
, 0);
303 msrpc_gen(mem_ctx
, &names_blob
,
305 NTLMSSP_NAME_TYPE_DOMAIN
, domain
,
306 NTLMSSP_NAME_TYPE_SERVER
, hostname
,
311 static DATA_BLOB
NTLMv2_generate_client_data(TALLOC_CTX
*mem_ctx
, const DATA_BLOB
*names_blob
)
313 uint8_t client_chal
[8];
314 DATA_BLOB response
= data_blob(NULL
, 0);
315 uint8_t long_date
[8];
318 unix_to_nt_time(&nttime
, time(NULL
));
320 generate_random_buffer(client_chal
, sizeof(client_chal
));
322 push_nttime(long_date
, 0, nttime
);
324 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
326 msrpc_gen(mem_ctx
, &response
, "ddbbdb",
327 0x00000101, /* Header */
329 long_date
, 8, /* Timestamp */
330 client_chal
, 8, /* client challenge */
332 names_blob
->data
, names_blob
->length
); /* End of name list */
337 static DATA_BLOB
NTLMv2_generate_response(TALLOC_CTX
*out_mem_ctx
,
338 const uint8_t ntlm_v2_hash
[16],
339 const DATA_BLOB
*server_chal
,
340 const DATA_BLOB
*names_blob
)
342 uint8_t ntlmv2_response
[16];
343 DATA_BLOB ntlmv2_client_data
;
344 DATA_BLOB final_response
;
346 TALLOC_CTX
*mem_ctx
= talloc_named(out_mem_ctx
, 0,
347 "NTLMv2_generate_response internal context");
350 return data_blob(NULL
, 0);
354 /* generate some data to pass into the response function - including
355 the hostname and domain name of the server */
356 ntlmv2_client_data
= NTLMv2_generate_client_data(mem_ctx
, names_blob
);
358 /* Given that data, and the challenge from the server, generate a response */
359 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &ntlmv2_client_data
, ntlmv2_response
);
361 final_response
= data_blob_talloc(out_mem_ctx
, NULL
, sizeof(ntlmv2_response
) + ntlmv2_client_data
.length
);
363 memcpy(final_response
.data
, ntlmv2_response
, sizeof(ntlmv2_response
));
365 memcpy(final_response
.data
+sizeof(ntlmv2_response
),
366 ntlmv2_client_data
.data
, ntlmv2_client_data
.length
);
368 talloc_free(mem_ctx
);
370 return final_response
;
373 static DATA_BLOB
LMv2_generate_response(TALLOC_CTX
*mem_ctx
,
374 const uint8_t ntlm_v2_hash
[16],
375 const DATA_BLOB
*server_chal
)
377 uint8_t lmv2_response
[16];
378 DATA_BLOB lmv2_client_data
= data_blob_talloc(mem_ctx
, NULL
, 8);
379 DATA_BLOB final_response
= data_blob_talloc(mem_ctx
, NULL
,24);
382 /* client-supplied random data */
383 generate_random_buffer(lmv2_client_data
.data
, lmv2_client_data
.length
);
385 /* Given that data, and the challenge from the server, generate a response */
386 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &lmv2_client_data
, lmv2_response
);
387 memcpy(final_response
.data
, lmv2_response
, sizeof(lmv2_response
));
389 /* after the first 16 bytes is the random data we generated above,
390 so the server can verify us with it */
391 memcpy(final_response
.data
+sizeof(lmv2_response
),
392 lmv2_client_data
.data
, lmv2_client_data
.length
);
394 data_blob_free(&lmv2_client_data
);
396 return final_response
;
399 bool SMBNTLMv2encrypt_hash(TALLOC_CTX
*mem_ctx
,
400 const char *user
, const char *domain
, const uint8_t nt_hash
[16],
401 const DATA_BLOB
*server_chal
,
402 const DATA_BLOB
*names_blob
,
403 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
404 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
406 uint8_t ntlm_v2_hash
[16];
408 /* We don't use the NT# directly. Instead we use it mashed up with
409 the username and domain.
410 This prevents username swapping during the auth exchange
412 if (!ntv2_owf_gen(nt_hash
, user
, domain
, true, ntlm_v2_hash
)) {
417 *nt_response
= NTLMv2_generate_response(mem_ctx
,
418 ntlm_v2_hash
, server_chal
,
420 if (user_session_key
) {
421 *user_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
423 /* The NTLMv2 calculations also provide a session key, for signing etc later */
424 /* use only the first 16 bytes of nt_response for session key */
425 SMBsesskeygen_ntv2(ntlm_v2_hash
, nt_response
->data
, user_session_key
->data
);
432 *lm_response
= LMv2_generate_response(mem_ctx
,
433 ntlm_v2_hash
, server_chal
);
434 if (lm_session_key
) {
435 *lm_session_key
= data_blob_talloc(mem_ctx
, NULL
, 16);
437 /* The NTLMv2 calculations also provide a session key, for signing etc later */
438 /* use only the first 16 bytes of lm_response for session key */
439 SMBsesskeygen_ntv2(ntlm_v2_hash
, lm_response
->data
, lm_session_key
->data
);
446 bool SMBNTLMv2encrypt(TALLOC_CTX
*mem_ctx
,
447 const char *user
, const char *domain
,
448 const char *password
,
449 const DATA_BLOB
*server_chal
,
450 const DATA_BLOB
*names_blob
,
451 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
452 DATA_BLOB
*lm_session_key
, DATA_BLOB
*user_session_key
)
455 E_md4hash(password
, nt_hash
);
457 return SMBNTLMv2encrypt_hash(mem_ctx
,
458 user
, domain
, nt_hash
, server_chal
, names_blob
,
459 lm_response
, nt_response
, lm_session_key
, user_session_key
);
462 /***********************************************************
463 encode a password buffer with a unicode password. The buffer
464 is filled with random data to make it harder to attack.
465 ************************************************************/
466 bool encode_pw_buffer(uint8_t buffer
[516], const char *password
, int string_flags
)
471 /* the incoming buffer can be any alignment. */
472 string_flags
|= STR_NOALIGN
;
474 new_pw_len
= push_string(new_pw
,
476 sizeof(new_pw
), string_flags
);
478 memcpy(&buffer
[512 - new_pw_len
], new_pw
, new_pw_len
);
480 generate_random_buffer(buffer
, 512 - new_pw_len
);
483 * The length of the new password is in the last 4 bytes of
486 SIVAL(buffer
, 512, new_pw_len
);
492 /***********************************************************
493 decode a password buffer
494 *new_pw_len is the length in bytes of the possibly mulitbyte
495 returned password including termination.
496 ************************************************************/
497 bool decode_pw_buffer(uint8_t in_buffer
[516], char *new_pwrd
,
498 int new_pwrd_size
, int string_flags
)
501 ssize_t converted_pw_len
;
503 /* the incoming buffer can be any alignment. */
504 string_flags
|= STR_NOALIGN
;
507 Warning !!! : This function is called from some rpc call.
508 The password IN the buffer may be a UNICODE string.
509 The password IN new_pwrd is an ASCII string
510 If you reuse that code somewhere else check first.
513 /* The length of the new password is in the last 4 bytes of the data buffer. */
515 byte_len
= IVAL(in_buffer
, 512);
517 #ifdef DEBUG_PASSWORD
518 dump_data(100, in_buffer
, 516);
521 /* Password cannot be longer than the size of the password buffer */
522 if ( (byte_len
< 0) || (byte_len
> 512)) {
526 /* decode into the return buffer. Buffer length supplied */
527 converted_pw_len
= pull_string(new_pwrd
, &in_buffer
[512 - byte_len
], new_pwrd_size
,
528 byte_len
, string_flags
);
530 if (converted_pw_len
== -1) {
534 #ifdef DEBUG_PASSWORD
535 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
536 dump_data(100, (const uint8_t *)new_pwrd
, converted_pw_len
);
537 DEBUG(100,("multibyte len:%d\n", (int)converted_pw_len
));
538 DEBUG(100,("original char len:%d\n", byte_len
/2));
544 /***********************************************************
545 encode a password buffer with an already unicode password. The
546 rest of the buffer is filled with random data to make it harder to attack.
547 ************************************************************/
548 bool set_pw_in_buffer(uint8_t buffer
[516], DATA_BLOB
*password
)
550 if (password
->length
> 512) {
554 memcpy(&buffer
[512 - password
->length
], password
->data
, password
->length
);
556 generate_random_buffer(buffer
, 512 - password
->length
);
559 * The length of the new password is in the last 4 bytes of
562 SIVAL(buffer
, 512, password
->length
);
566 /***********************************************************
567 decode a password buffer
568 *new_pw_size is the length in bytes of the extracted unicode password
569 ************************************************************/
570 bool extract_pw_from_buffer(TALLOC_CTX
*mem_ctx
,
571 uint8_t in_buffer
[516], DATA_BLOB
*new_pass
)
575 /* The length of the new password is in the last 4 bytes of the data buffer. */
577 byte_len
= IVAL(in_buffer
, 512);
579 #ifdef DEBUG_PASSWORD
580 dump_data(100, in_buffer
, 516);
583 /* Password cannot be longer than the size of the password buffer */
584 if ( (byte_len
< 0) || (byte_len
> 512)) {
588 *new_pass
= data_blob_talloc(mem_ctx
, &in_buffer
[512 - byte_len
], byte_len
);
590 if (!new_pass
->data
) {