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 DES forward-only Hash of the users password in DOS ASCII charset
77 * @param passwd password in 'unix' charset.
78 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
79 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
80 * @note p16 is filled in regardless
83 BOOL
E_deshash(const char *passwd
, uchar p16
[16])
89 /* Password must be converted to DOS charset - null terminated, uppercase. */
90 push_ascii(dospwd
, passwd
, sizeof(dospwd
), STR_UPPER
|STR_TERMINATE
);
92 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
93 E_P16((const unsigned char *)dospwd
, p16
);
95 if (strlen(dospwd
) > 14) {
105 * Creates the MD4 and DES (LM) Hash of the users password.
106 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
107 * @param passwd password in 'unix' charset.
108 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
109 * @param p16 return password hashed with des, caller allocated 16 byte buffer
112 /* Does both the NT and LM owfs of a user's password */
113 void nt_lm_owf_gen(const char *pwd
, uchar nt_p16
[16], uchar p16
[16])
115 /* Calculate the MD4 hash (NT compatible) of the password */
116 memset(nt_p16
, '\0', 16);
117 E_md4hash(pwd
, nt_p16
);
119 #ifdef DEBUG_PASSWORD
120 DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
121 dump_data(120, pwd
, strlen(pwd
));
122 dump_data(100, (char *)nt_p16
, 16);
125 E_deshash(pwd
, (uchar
*)p16
);
127 #ifdef DEBUG_PASSWORD
128 DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
129 dump_data(120, pwd
, strlen(pwd
));
130 dump_data(100, (char *)p16
, 16);
134 /* Does both the NTLMv2 owfs of a user's password */
135 BOOL
ntv2_owf_gen(const uchar owf
[16],
136 const char *user_in
, const char *domain_in
,
137 BOOL upper_case_domain
, /* Transform the domain into UPPER case */
143 size_t user_byte_len
;
144 size_t domain_byte_len
;
148 user_byte_len
= push_ucs2_allocate(&user
, user_in
);
149 if (user_byte_len
== (size_t)-1) {
150 DEBUG(0, ("push_uss2_allocate() for user returned -1 (probably malloc() failure)\n"));
154 domain_byte_len
= push_ucs2_allocate(&domain
, domain_in
);
155 if (domain_byte_len
== (size_t)-1) {
156 DEBUG(0, ("push_uss2_allocate() for domain returned -1 (probably malloc() failure)\n"));
162 if (upper_case_domain
)
165 SMB_ASSERT(user_byte_len
>= 2);
166 SMB_ASSERT(domain_byte_len
>= 2);
168 /* We don't want null termination */
169 user_byte_len
= user_byte_len
- 2;
170 domain_byte_len
= domain_byte_len
- 2;
172 hmac_md5_init_limK_to_64(owf
, 16, &ctx
);
173 hmac_md5_update((const unsigned char *)user
, user_byte_len
, &ctx
);
174 hmac_md5_update((const unsigned char *)domain
, domain_byte_len
, &ctx
);
175 hmac_md5_final(kr_buf
, &ctx
);
177 #ifdef DEBUG_PASSWORD
178 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
179 dump_data(100, (const char *)user
, user_byte_len
);
180 dump_data(100, (const char *)domain
, domain_byte_len
);
181 dump_data(100, owf
, 16);
182 dump_data(100, kr_buf
, 16);
190 /* Does the des encryption from the NT or LM MD4 hash. */
191 void SMBOWFencrypt(const uchar passwd
[16], const uchar
*c8
, uchar p24
[24])
197 memcpy(p21
, passwd
, 16);
201 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
202 void NTLMSSPOWFencrypt(const uchar passwd
[8], const uchar
*ntlmchalresp
, uchar p24
[24])
207 memcpy(p21
, passwd
, 8);
208 memset(p21
+ 8, 0xbd, 8);
210 E_P24(p21
, ntlmchalresp
, p24
);
211 #ifdef DEBUG_PASSWORD
212 DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
213 dump_data(100, (char *)p21
, 21);
214 dump_data(100, (const char *)ntlmchalresp
, 8);
215 dump_data(100, (char *)p24
, 24);
220 /* Does the NT MD4 hash then des encryption. */
222 void SMBNTencrypt(const char *passwd
, uchar
*c8
, uchar
*p24
)
228 E_md4hash(passwd
, p21
);
229 SMBOWFencrypt(p21
, c8
, p24
);
231 #ifdef DEBUG_PASSWORD
232 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
233 dump_data(100, (char *)p21
, 16);
234 dump_data(100, (char *)c8
, 8);
235 dump_data(100, (char *)p24
, 24);
239 /* Does the md5 encryption from the Key Response for NTLMv2. */
240 void SMBOWFencrypt_ntv2(const uchar kr
[16],
241 const DATA_BLOB
*srv_chal
,
242 const DATA_BLOB
*cli_chal
,
247 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
248 hmac_md5_update(srv_chal
->data
, srv_chal
->length
, &ctx
);
249 hmac_md5_update(cli_chal
->data
, cli_chal
->length
, &ctx
);
250 hmac_md5_final(resp_buf
, &ctx
);
252 #ifdef DEBUG_PASSWORD
253 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
254 dump_data(100, srv_chal
->data
, srv_chal
->length
);
255 dump_data(100, cli_chal
->data
, cli_chal
->length
);
256 dump_data(100, resp_buf
, 16);
260 void SMBsesskeygen_ntv2(const uchar kr
[16],
261 const uchar
* nt_resp
, uint8 sess_key
[16])
263 /* a very nice, 128 bit, variable session key */
267 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
268 hmac_md5_update(nt_resp
, 16, &ctx
);
269 hmac_md5_final((unsigned char *)sess_key
, &ctx
);
271 #ifdef DEBUG_PASSWORD
272 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
273 dump_data(100, sess_key
, 16);
277 void SMBsesskeygen_ntv1(const uchar kr
[16],
278 const uchar
* nt_resp
, uint8 sess_key
[16])
280 /* yes, this session key does not change - yes, this
281 is a problem - but it is 128 bits */
283 mdfour((unsigned char *)sess_key
, kr
, 16);
285 #ifdef DEBUG_PASSWORD
286 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
287 dump_data(100, sess_key
, 16);
291 void SMBsesskeygen_lmv1(const uchar lm_hash
[16],
292 const uchar lm_resp
[24], /* only uses 8 */
295 /* Calculate the LM session key (effective length 40 bits,
296 but changes with each session) */
299 uchar partial_lm_hash
[16];
301 memcpy(partial_lm_hash
, lm_hash
, 8);
302 memset(partial_lm_hash
+ 8, 0xbd, 8);
304 SMBOWFencrypt(lm_hash
, lm_resp
, p24
);
306 memcpy(sess_key
, p24
, 16);
311 #ifdef DEBUG_PASSWORD
312 DEBUG(100, ("SMBsesskeygen_lmv1:\n"));
313 dump_data(100, sess_key
, 16);
317 void SMBsesskeygen_lm_sess_key(const uchar lm_hash
[16],
318 const uchar lm_resp
[24], /* only uses 8 */
322 uchar partial_lm_hash
[16];
324 memcpy(partial_lm_hash
, lm_hash
, 8);
325 memset(partial_lm_hash
+ 8, 0xbd, 8);
327 SMBOWFencrypt(partial_lm_hash
, lm_resp
, p24
);
329 memcpy(sess_key
, p24
, 16);
331 #ifdef DEBUG_PASSWORD
332 DEBUG(100, ("SMBsesskeygen_lmv1_jerry:\n"));
333 dump_data(100, sess_key
, 16);
337 DATA_BLOB
NTLMv2_generate_names_blob(const char *hostname
,
340 DATA_BLOB names_blob
= data_blob(NULL
, 0);
342 msrpc_gen(&names_blob
, "aaa",
343 NTLMSSP_NAME_TYPE_DOMAIN
, domain
,
344 NTLMSSP_NAME_TYPE_SERVER
, hostname
,
349 static DATA_BLOB
NTLMv2_generate_client_data(const DATA_BLOB
*names_blob
)
351 uchar client_chal
[8];
352 DATA_BLOB response
= data_blob(NULL
, 0);
355 generate_random_buffer(client_chal
, sizeof(client_chal
), False
);
357 put_long_date(long_date
, time(NULL
));
359 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
361 msrpc_gen(&response
, "ddbbdb",
362 0x00000101, /* Header */
364 long_date
, 8, /* Timestamp */
365 client_chal
, 8, /* client challenge */
367 names_blob
->data
, names_blob
->length
); /* End of name list */
372 static DATA_BLOB
NTLMv2_generate_response(const uchar ntlm_v2_hash
[16],
373 const DATA_BLOB
*server_chal
,
374 const DATA_BLOB
*names_blob
)
376 uchar ntlmv2_response
[16];
377 DATA_BLOB ntlmv2_client_data
;
378 DATA_BLOB final_response
;
381 /* generate some data to pass into the response function - including
382 the hostname and domain name of the server */
383 ntlmv2_client_data
= NTLMv2_generate_client_data(names_blob
);
385 /* Given that data, and the challenge from the server, generate a response */
386 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &ntlmv2_client_data
, ntlmv2_response
);
388 final_response
= data_blob(NULL
, sizeof(ntlmv2_response
) + ntlmv2_client_data
.length
);
390 memcpy(final_response
.data
, ntlmv2_response
, sizeof(ntlmv2_response
));
392 memcpy(final_response
.data
+sizeof(ntlmv2_response
),
393 ntlmv2_client_data
.data
, ntlmv2_client_data
.length
);
395 data_blob_free(&ntlmv2_client_data
);
397 return final_response
;
400 static DATA_BLOB
LMv2_generate_response(const uchar ntlm_v2_hash
[16],
401 const DATA_BLOB
*server_chal
)
403 uchar lmv2_response
[16];
404 DATA_BLOB lmv2_client_data
= data_blob(NULL
, 8);
405 DATA_BLOB final_response
= data_blob(NULL
, 24);
408 /* client-supplied random data */
409 generate_random_buffer(lmv2_client_data
.data
, lmv2_client_data
.length
, False
);
411 /* Given that data, and the challenge from the server, generate a response */
412 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &lmv2_client_data
, lmv2_response
);
413 memcpy(final_response
.data
, lmv2_response
, sizeof(lmv2_response
));
415 /* after the first 16 bytes is the random data we generated above,
416 so the server can verify us with it */
417 memcpy(final_response
.data
+sizeof(lmv2_response
),
418 lmv2_client_data
.data
, lmv2_client_data
.length
);
420 data_blob_free(&lmv2_client_data
);
422 return final_response
;
425 BOOL
SMBNTLMv2encrypt(const char *user
, const char *domain
, const char *password
,
426 const DATA_BLOB
*server_chal
,
427 const DATA_BLOB
*names_blob
,
428 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
429 DATA_BLOB
*user_session_key
)
432 uchar ntlm_v2_hash
[16];
433 E_md4hash(password
, nt_hash
);
435 /* We don't use the NT# directly. Instead we use it mashed up with
436 the username and domain.
437 This prevents username swapping during the auth exchange
439 if (!ntv2_owf_gen(nt_hash
, user
, domain
, True
, ntlm_v2_hash
)) {
444 *nt_response
= NTLMv2_generate_response(ntlm_v2_hash
, server_chal
,
446 if (user_session_key
) {
447 *user_session_key
= data_blob(NULL
, 16);
449 /* The NTLMv2 calculations also provide a session key, for signing etc later */
450 /* use only the first 16 bytes of nt_response for session key */
451 SMBsesskeygen_ntv2(ntlm_v2_hash
, nt_response
->data
, user_session_key
->data
);
458 *lm_response
= LMv2_generate_response(ntlm_v2_hash
, server_chal
);
464 /***********************************************************
465 encode a password buffer with a unicode password. The buffer
466 is filled with random data to make it harder to attack.
467 ************************************************************/
468 BOOL
encode_pw_buffer(char buffer
[516], const char *password
, int string_flags
)
473 new_pw_len
= push_string(NULL
, new_pw
,
475 sizeof(new_pw
), string_flags
);
477 memcpy(&buffer
[512 - new_pw_len
], new_pw
, new_pw_len
);
479 generate_random_buffer((unsigned char *)buffer
, 512 - new_pw_len
, True
);
482 * The length of the new password is in the last 4 bytes of
485 SIVAL(buffer
, 512, new_pw_len
);
491 /***********************************************************
492 decode a password buffer
493 *new_pw_len is the length in bytes of the possibly mulitbyte
494 returned password including termination.
495 ************************************************************/
496 BOOL
decode_pw_buffer(char in_buffer
[516], char *new_pwrd
,
497 int new_pwrd_size
, uint32
*new_pw_len
,
503 Warning !!! : This function is called from some rpc call.
504 The password IN the buffer may be a UNICODE string.
505 The password IN new_pwrd is an ASCII string
506 If you reuse that code somewhere else check first.
509 /* The length of the new password is in the last 4 bytes of the data buffer. */
511 byte_len
= IVAL(in_buffer
, 512);
513 #ifdef DEBUG_PASSWORD
514 dump_data(100, in_buffer
, 516);
517 /* Password cannot be longer than the size of the password buffer */
518 if ( (byte_len
< 0) || (byte_len
> 512)) {
519 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len
));
520 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
524 /* decode into the return buffer. Buffer length supplied */
525 *new_pw_len
= pull_string(NULL
, new_pwrd
, &in_buffer
[512 - byte_len
], new_pwrd_size
,
526 byte_len
, string_flags
);
528 #ifdef DEBUG_PASSWORD
529 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
530 dump_data(100, (char *)new_pwrd
, *new_pw_len
);
531 DEBUG(100,("multibyte len:%d\n", *new_pw_len
));
532 DEBUG(100,("original char len:%d\n", byte_len
/2));