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 2 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, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "byteorder.h"
29 This implements the X/Open SMB password encryption
30 It takes a password ('unix' string), a 8 byte "crypt key"
31 and puts 24 bytes of encrypted password into p24
33 Returns False if password must have been truncated to create LM hash
35 BOOL
SMBencrypt(const char *passwd
, const uchar
*c8
, uchar p24
[24])
41 ret
= E_deshash(passwd
, p21
);
43 SMBOWFencrypt(p21
, c8
, p24
);
46 DEBUG(100,("SMBencrypt: lm#, challenge, response\n"));
47 dump_data(100, (char *)p21
, 16);
48 dump_data(100, (const char *)c8
, 8);
49 dump_data(100, (char *)p24
, 24);
56 * Creates the MD4 Hash of the users password in NT UNICODE.
57 * @param passwd password in 'unix' charset.
58 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
61 void E_md4hash(const char *passwd
, uchar p16
[16])
66 /* Password must be converted to NT unicode - null terminated. */
67 push_ucs2(NULL
, wpwd
, (const char *)passwd
, 256, STR_UNICODE
|STR_NOALIGN
|STR_TERMINATE
);
68 /* Calculate length in bytes */
69 len
= strlen_w(wpwd
) * sizeof(int16
);
71 mdfour(p16
, (unsigned char *)wpwd
, len
);
76 * Creates the MD5 Hash of a combination of 16 byte salt and 16 byte NT hash.
77 * @param 16 byte salt.
78 * @param 16 byte NT hash.
79 * @param 16 byte return hashed with md5, caller allocated 16 byte buffer
82 void E_md5hash(const uchar salt
[16], const uchar nthash
[16], uchar hash_out
[16])
84 struct MD5Context tctx
;
87 memset(hash_out
, '\0', 16);
88 memcpy(array
, salt
, 16);
89 memcpy(&array
[16], nthash
, 16);
91 MD5Update(&tctx
, array
, 32);
92 MD5Final(hash_out
, &tctx
);
96 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
97 * @param passwd password in 'unix' charset.
98 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
99 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
100 * @note p16 is filled in regardless
103 BOOL
E_deshash(const char *passwd
, uchar p16
[16])
109 /* Password must be converted to DOS charset - null terminated, uppercase. */
110 push_ascii(dospwd
, passwd
, sizeof(dospwd
), STR_UPPER
|STR_TERMINATE
);
112 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
113 E_P16((const unsigned char *)dospwd
, p16
);
115 if (strlen(dospwd
) > 14) {
125 * Creates the MD4 and DES (LM) Hash of the users password.
126 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
127 * @param passwd password in 'unix' charset.
128 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
129 * @param p16 return password hashed with des, caller allocated 16 byte buffer
132 /* Does both the NT and LM owfs of a user's password */
133 void nt_lm_owf_gen(const char *pwd
, uchar nt_p16
[16], uchar p16
[16])
135 /* Calculate the MD4 hash (NT compatible) of the password */
136 memset(nt_p16
, '\0', 16);
137 E_md4hash(pwd
, nt_p16
);
139 #ifdef DEBUG_PASSWORD
140 DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
141 dump_data(120, pwd
, strlen(pwd
));
142 dump_data(100, (char *)nt_p16
, 16);
145 E_deshash(pwd
, (uchar
*)p16
);
147 #ifdef DEBUG_PASSWORD
148 DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
149 dump_data(120, pwd
, strlen(pwd
));
150 dump_data(100, (char *)p16
, 16);
154 /* Does both the NTLMv2 owfs of a user's password */
155 BOOL
ntv2_owf_gen(const uchar owf
[16],
156 const char *user_in
, const char *domain_in
,
157 BOOL upper_case_domain
, /* Transform the domain into UPPER case */
163 size_t user_byte_len
;
164 size_t domain_byte_len
;
168 user_byte_len
= push_ucs2_allocate(&user
, user_in
);
169 if (user_byte_len
== (size_t)-1) {
170 DEBUG(0, ("push_uss2_allocate() for user returned -1 (probably malloc() failure)\n"));
174 domain_byte_len
= push_ucs2_allocate(&domain
, domain_in
);
175 if (domain_byte_len
== (size_t)-1) {
176 DEBUG(0, ("push_uss2_allocate() for domain returned -1 (probably malloc() failure)\n"));
182 if (upper_case_domain
)
185 SMB_ASSERT(user_byte_len
>= 2);
186 SMB_ASSERT(domain_byte_len
>= 2);
188 /* We don't want null termination */
189 user_byte_len
= user_byte_len
- 2;
190 domain_byte_len
= domain_byte_len
- 2;
192 hmac_md5_init_limK_to_64(owf
, 16, &ctx
);
193 hmac_md5_update((const unsigned char *)user
, user_byte_len
, &ctx
);
194 hmac_md5_update((const unsigned char *)domain
, domain_byte_len
, &ctx
);
195 hmac_md5_final(kr_buf
, &ctx
);
197 #ifdef DEBUG_PASSWORD
198 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
199 dump_data(100, (const char *)user
, user_byte_len
);
200 dump_data(100, (const char *)domain
, domain_byte_len
);
201 dump_data(100, owf
, 16);
202 dump_data(100, kr_buf
, 16);
210 /* Does the des encryption from the NT or LM MD4 hash. */
211 void SMBOWFencrypt(const uchar passwd
[16], const uchar
*c8
, uchar p24
[24])
217 memcpy(p21
, passwd
, 16);
221 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
222 void NTLMSSPOWFencrypt(const uchar passwd
[8], const uchar
*ntlmchalresp
, uchar p24
[24])
227 memcpy(p21
, passwd
, 8);
228 memset(p21
+ 8, 0xbd, 8);
230 E_P24(p21
, ntlmchalresp
, p24
);
231 #ifdef DEBUG_PASSWORD
232 DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
233 dump_data(100, (char *)p21
, 21);
234 dump_data(100, (const char *)ntlmchalresp
, 8);
235 dump_data(100, (char *)p24
, 24);
240 /* Does the NT MD4 hash then des encryption. */
242 void SMBNTencrypt(const char *passwd
, uchar
*c8
, uchar
*p24
)
248 E_md4hash(passwd
, p21
);
249 SMBOWFencrypt(p21
, c8
, p24
);
251 #ifdef DEBUG_PASSWORD
252 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
253 dump_data(100, (char *)p21
, 16);
254 dump_data(100, (char *)c8
, 8);
255 dump_data(100, (char *)p24
, 24);
259 /* Does the md5 encryption from the Key Response for NTLMv2. */
260 void SMBOWFencrypt_ntv2(const uchar kr
[16],
261 const DATA_BLOB
*srv_chal
,
262 const DATA_BLOB
*cli_chal
,
267 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
268 hmac_md5_update(srv_chal
->data
, srv_chal
->length
, &ctx
);
269 hmac_md5_update(cli_chal
->data
, cli_chal
->length
, &ctx
);
270 hmac_md5_final(resp_buf
, &ctx
);
272 #ifdef DEBUG_PASSWORD
273 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
274 dump_data(100, srv_chal
->data
, srv_chal
->length
);
275 dump_data(100, cli_chal
->data
, cli_chal
->length
);
276 dump_data(100, resp_buf
, 16);
280 void SMBsesskeygen_ntv2(const uchar kr
[16],
281 const uchar
* nt_resp
, uint8 sess_key
[16])
283 /* a very nice, 128 bit, variable session key */
287 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
288 hmac_md5_update(nt_resp
, 16, &ctx
);
289 hmac_md5_final((unsigned char *)sess_key
, &ctx
);
291 #ifdef DEBUG_PASSWORD
292 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
293 dump_data(100, sess_key
, 16);
297 void SMBsesskeygen_ntv1(const uchar kr
[16],
298 const uchar
* nt_resp
, uint8 sess_key
[16])
300 /* yes, this session key does not change - yes, this
301 is a problem - but it is 128 bits */
303 mdfour((unsigned char *)sess_key
, kr
, 16);
305 #ifdef DEBUG_PASSWORD
306 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
307 dump_data(100, sess_key
, 16);
311 void SMBsesskeygen_lmv1(const uchar lm_hash
[16],
312 const uchar lm_resp
[24], /* only uses 8 */
315 /* Calculate the LM session key (effective length 40 bits,
316 but changes with each session) */
319 uchar partial_lm_hash
[16];
321 memcpy(partial_lm_hash
, lm_hash
, 8);
322 memset(partial_lm_hash
+ 8, 0xbd, 8);
324 SMBOWFencrypt(lm_hash
, lm_resp
, p24
);
326 memcpy(sess_key
, p24
, 16);
331 #ifdef DEBUG_PASSWORD
332 DEBUG(100, ("SMBsesskeygen_lmv1:\n"));
333 dump_data(100, sess_key
, 16);
337 void SMBsesskeygen_lm_sess_key(const uchar lm_hash
[16],
338 const uchar lm_resp
[24], /* only uses 8 */
342 uchar partial_lm_hash
[16];
344 memcpy(partial_lm_hash
, lm_hash
, 8);
345 memset(partial_lm_hash
+ 8, 0xbd, 8);
347 SMBOWFencrypt(partial_lm_hash
, lm_resp
, p24
);
349 memcpy(sess_key
, p24
, 16);
351 #ifdef DEBUG_PASSWORD
352 DEBUG(100, ("SMBsesskeygen_lmv1_jerry:\n"));
353 dump_data(100, sess_key
, 16);
357 DATA_BLOB
NTLMv2_generate_names_blob(const char *hostname
,
360 DATA_BLOB names_blob
= data_blob(NULL
, 0);
362 msrpc_gen(&names_blob
, "aaa",
363 NTLMSSP_NAME_TYPE_DOMAIN
, domain
,
364 NTLMSSP_NAME_TYPE_SERVER
, hostname
,
369 static DATA_BLOB
NTLMv2_generate_client_data(const DATA_BLOB
*names_blob
)
371 uchar client_chal
[8];
372 DATA_BLOB response
= data_blob(NULL
, 0);
375 generate_random_buffer(client_chal
, sizeof(client_chal
));
377 put_long_date(long_date
, time(NULL
));
379 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
381 msrpc_gen(&response
, "ddbbdb",
382 0x00000101, /* Header */
384 long_date
, 8, /* Timestamp */
385 client_chal
, 8, /* client challenge */
387 names_blob
->data
, names_blob
->length
); /* End of name list */
392 static DATA_BLOB
NTLMv2_generate_response(const uchar ntlm_v2_hash
[16],
393 const DATA_BLOB
*server_chal
,
394 const DATA_BLOB
*names_blob
)
396 uchar ntlmv2_response
[16];
397 DATA_BLOB ntlmv2_client_data
;
398 DATA_BLOB final_response
;
401 /* generate some data to pass into the response function - including
402 the hostname and domain name of the server */
403 ntlmv2_client_data
= NTLMv2_generate_client_data(names_blob
);
405 /* Given that data, and the challenge from the server, generate a response */
406 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &ntlmv2_client_data
, ntlmv2_response
);
408 final_response
= data_blob(NULL
, sizeof(ntlmv2_response
) + ntlmv2_client_data
.length
);
410 memcpy(final_response
.data
, ntlmv2_response
, sizeof(ntlmv2_response
));
412 memcpy(final_response
.data
+sizeof(ntlmv2_response
),
413 ntlmv2_client_data
.data
, ntlmv2_client_data
.length
);
415 data_blob_free(&ntlmv2_client_data
);
417 return final_response
;
420 static DATA_BLOB
LMv2_generate_response(const uchar ntlm_v2_hash
[16],
421 const DATA_BLOB
*server_chal
)
423 uchar lmv2_response
[16];
424 DATA_BLOB lmv2_client_data
= data_blob(NULL
, 8);
425 DATA_BLOB final_response
= data_blob(NULL
, 24);
428 /* client-supplied random data */
429 generate_random_buffer(lmv2_client_data
.data
, lmv2_client_data
.length
);
431 /* Given that data, and the challenge from the server, generate a response */
432 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &lmv2_client_data
, lmv2_response
);
433 memcpy(final_response
.data
, lmv2_response
, sizeof(lmv2_response
));
435 /* after the first 16 bytes is the random data we generated above,
436 so the server can verify us with it */
437 memcpy(final_response
.data
+sizeof(lmv2_response
),
438 lmv2_client_data
.data
, lmv2_client_data
.length
);
440 data_blob_free(&lmv2_client_data
);
442 return final_response
;
445 BOOL
SMBNTLMv2encrypt(const char *user
, const char *domain
, const char *password
,
446 const DATA_BLOB
*server_chal
,
447 const DATA_BLOB
*names_blob
,
448 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
449 DATA_BLOB
*user_session_key
)
452 uchar ntlm_v2_hash
[16];
453 E_md4hash(password
, nt_hash
);
455 /* We don't use the NT# directly. Instead we use it mashed up with
456 the username and domain.
457 This prevents username swapping during the auth exchange
459 if (!ntv2_owf_gen(nt_hash
, user
, domain
, True
, ntlm_v2_hash
)) {
464 *nt_response
= NTLMv2_generate_response(ntlm_v2_hash
, server_chal
,
466 if (user_session_key
) {
467 *user_session_key
= data_blob(NULL
, 16);
469 /* The NTLMv2 calculations also provide a session key, for signing etc later */
470 /* use only the first 16 bytes of nt_response for session key */
471 SMBsesskeygen_ntv2(ntlm_v2_hash
, nt_response
->data
, user_session_key
->data
);
478 *lm_response
= LMv2_generate_response(ntlm_v2_hash
, server_chal
);
484 /***********************************************************
485 encode a password buffer with a unicode password. The buffer
486 is filled with random data to make it harder to attack.
487 ************************************************************/
488 BOOL
encode_pw_buffer(char buffer
[516], const char *password
, int string_flags
)
493 new_pw_len
= push_string(NULL
, new_pw
,
495 sizeof(new_pw
), string_flags
);
497 memcpy(&buffer
[512 - new_pw_len
], new_pw
, new_pw_len
);
499 generate_random_buffer((unsigned char *)buffer
, 512 - new_pw_len
);
502 * The length of the new password is in the last 4 bytes of
505 SIVAL(buffer
, 512, new_pw_len
);
511 /***********************************************************
512 decode a password buffer
513 *new_pw_len is the length in bytes of the possibly mulitbyte
514 returned password including termination.
515 ************************************************************/
516 BOOL
decode_pw_buffer(uint8 in_buffer
[516], char *new_pwrd
,
517 int new_pwrd_size
, uint32
*new_pw_len
,
523 Warning !!! : This function is called from some rpc call.
524 The password IN the buffer may be a UNICODE string.
525 The password IN new_pwrd is an ASCII string
526 If you reuse that code somewhere else check first.
529 /* The length of the new password is in the last 4 bytes of the data buffer. */
531 byte_len
= IVAL(in_buffer
, 512);
533 #ifdef DEBUG_PASSWORD
534 dump_data(100, in_buffer
, 516);
537 /* Password cannot be longer than the size of the password buffer */
538 if ( (byte_len
< 0) || (byte_len
> 512)) {
539 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len
));
540 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
544 /* decode into the return buffer. Buffer length supplied */
545 *new_pw_len
= pull_string(NULL
, new_pwrd
, &in_buffer
[512 - byte_len
], new_pwrd_size
,
546 byte_len
, string_flags
);
548 #ifdef DEBUG_PASSWORD
549 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
550 dump_data(100, (char *)new_pwrd
, *new_pw_len
);
551 DEBUG(100,("multibyte len:%d\n", *new_pw_len
));
552 DEBUG(100,("original char len:%d\n", byte_len
/2));