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"
28 void SMBencrypt_hash(const uchar lm_hash
[16], const uchar
*c8
, uchar p24
[24])
33 memcpy(p21
, lm_hash
, 16);
35 SMBOWFencrypt(p21
, c8
, p24
);
38 DEBUG(100,("SMBencrypt_hash: lm#, challenge, response\n"));
39 dump_data(100, (const char *)p21
, 16);
40 dump_data(100, (const char *)c8
, 8);
41 dump_data(100, (const char *)p24
, 24);
46 This implements the X/Open SMB password encryption
47 It takes a password ('unix' string), a 8 byte "crypt key"
48 and puts 24 bytes of encrypted password into p24
50 Returns False if password must have been truncated to create LM hash
53 BOOL
SMBencrypt(const char *passwd
, const uchar
*c8
, uchar p24
[24])
58 ret
= E_deshash(passwd
, lm_hash
);
59 SMBencrypt_hash(lm_hash
, c8
, p24
);
64 * Creates the MD4 Hash of the users password in NT UNICODE.
65 * @param passwd password in 'unix' charset.
66 * @param p16 return password hashed with md4, caller allocated 16 byte buffer
69 void E_md4hash(const char *passwd
, uchar p16
[16])
74 /* Password must be converted to NT unicode - null terminated. */
75 push_ucs2(NULL
, wpwd
, (const char *)passwd
, 256, STR_UNICODE
|STR_NOALIGN
|STR_TERMINATE
);
76 /* Calculate length in bytes */
77 len
= strlen_w(wpwd
) * sizeof(int16
);
79 mdfour(p16
, (unsigned char *)wpwd
, len
);
84 * Creates the MD5 Hash of a combination of 16 byte salt and 16 byte NT hash.
85 * @param 16 byte salt.
86 * @param 16 byte NT hash.
87 * @param 16 byte return hashed with md5, caller allocated 16 byte buffer
90 void E_md5hash(const uchar salt
[16], const uchar nthash
[16], uchar hash_out
[16])
92 struct MD5Context tctx
;
95 memset(hash_out
, '\0', 16);
96 memcpy(array
, salt
, 16);
97 memcpy(&array
[16], nthash
, 16);
99 MD5Update(&tctx
, array
, 32);
100 MD5Final(hash_out
, &tctx
);
104 * Creates the DES forward-only Hash of the users password in DOS ASCII charset
105 * @param passwd password in 'unix' charset.
106 * @param p16 return password hashed with DES, caller allocated 16 byte buffer
107 * @return False if password was > 14 characters, and therefore may be incorrect, otherwise True
108 * @note p16 is filled in regardless
111 BOOL
E_deshash(const char *passwd
, uchar p16
[16])
117 /* Password must be converted to DOS charset - null terminated, uppercase. */
118 push_ascii(dospwd
, passwd
, sizeof(dospwd
), STR_UPPER
|STR_TERMINATE
);
120 /* Only the fisrt 14 chars are considered, password need not be null terminated. */
121 E_P16((const unsigned char *)dospwd
, p16
);
123 if (strlen(dospwd
) > 14) {
133 * Creates the MD4 and DES (LM) Hash of the users password.
134 * MD4 is of the NT Unicode, DES is of the DOS UPPERCASE password.
135 * @param passwd password in 'unix' charset.
136 * @param nt_p16 return password hashed with md4, caller allocated 16 byte buffer
137 * @param p16 return password hashed with des, caller allocated 16 byte buffer
140 /* Does both the NT and LM owfs of a user's password */
141 void nt_lm_owf_gen(const char *pwd
, uchar nt_p16
[16], uchar p16
[16])
143 /* Calculate the MD4 hash (NT compatible) of the password */
144 memset(nt_p16
, '\0', 16);
145 E_md4hash(pwd
, nt_p16
);
147 #ifdef DEBUG_PASSWORD
148 DEBUG(100,("nt_lm_owf_gen: pwd, nt#\n"));
149 dump_data(120, pwd
, strlen(pwd
));
150 dump_data(100, (char *)nt_p16
, 16);
153 E_deshash(pwd
, (uchar
*)p16
);
155 #ifdef DEBUG_PASSWORD
156 DEBUG(100,("nt_lm_owf_gen: pwd, lm#\n"));
157 dump_data(120, pwd
, strlen(pwd
));
158 dump_data(100, (char *)p16
, 16);
162 /* Does both the NTLMv2 owfs of a user's password */
163 BOOL
ntv2_owf_gen(const uchar owf
[16],
164 const char *user_in
, const char *domain_in
,
165 BOOL upper_case_domain
, /* Transform the domain into UPPER case */
171 size_t user_byte_len
;
172 size_t domain_byte_len
;
176 user_byte_len
= push_ucs2_allocate(&user
, user_in
);
177 if (user_byte_len
== (size_t)-1) {
178 DEBUG(0, ("push_uss2_allocate() for user returned -1 (probably malloc() failure)\n"));
182 domain_byte_len
= push_ucs2_allocate(&domain
, domain_in
);
183 if (domain_byte_len
== (size_t)-1) {
184 DEBUG(0, ("push_uss2_allocate() for domain returned -1 (probably malloc() failure)\n"));
191 if (upper_case_domain
)
194 SMB_ASSERT(user_byte_len
>= 2);
195 SMB_ASSERT(domain_byte_len
>= 2);
197 /* We don't want null termination */
198 user_byte_len
= user_byte_len
- 2;
199 domain_byte_len
= domain_byte_len
- 2;
201 hmac_md5_init_limK_to_64(owf
, 16, &ctx
);
202 hmac_md5_update((const unsigned char *)user
, user_byte_len
, &ctx
);
203 hmac_md5_update((const unsigned char *)domain
, domain_byte_len
, &ctx
);
204 hmac_md5_final(kr_buf
, &ctx
);
206 #ifdef DEBUG_PASSWORD
207 DEBUG(100, ("ntv2_owf_gen: user, domain, owfkey, kr\n"));
208 dump_data(100, (const char *)user
, user_byte_len
);
209 dump_data(100, (const char *)domain
, domain_byte_len
);
210 dump_data(100, (const char *)owf
, 16);
211 dump_data(100, (const char *)kr_buf
, 16);
219 /* Does the des encryption from the NT or LM MD4 hash. */
220 void SMBOWFencrypt(const uchar passwd
[16], const uchar
*c8
, uchar p24
[24])
226 memcpy(p21
, passwd
, 16);
230 /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
231 void NTLMSSPOWFencrypt(const uchar passwd
[8], const uchar
*ntlmchalresp
, uchar p24
[24])
236 memcpy(p21
, passwd
, 8);
237 memset(p21
+ 8, 0xbd, 8);
239 E_P24(p21
, ntlmchalresp
, p24
);
240 #ifdef DEBUG_PASSWORD
241 DEBUG(100,("NTLMSSPOWFencrypt: p21, c8, p24\n"));
242 dump_data(100, (char *)p21
, 21);
243 dump_data(100, (const char *)ntlmchalresp
, 8);
244 dump_data(100, (char *)p24
, 24);
249 /* Does the des encryption. */
251 void SMBNTencrypt_hash(const uchar nt_hash
[16], uchar
*c8
, uchar
*p24
)
256 memcpy(p21
, nt_hash
, 16);
257 SMBOWFencrypt(p21
, c8
, p24
);
259 #ifdef DEBUG_PASSWORD
260 DEBUG(100,("SMBNTencrypt: nt#, challenge, response\n"));
261 dump_data(100, (char *)p21
, 16);
262 dump_data(100, (char *)c8
, 8);
263 dump_data(100, (char *)p24
, 24);
267 /* Does the NT MD4 hash then des encryption. Plaintext version of the above. */
269 void SMBNTencrypt(const char *passwd
, uchar
*c8
, uchar
*p24
)
272 E_md4hash(passwd
, nt_hash
);
273 SMBNTencrypt_hash(nt_hash
, c8
, p24
);
276 /* Does the md5 encryption from the Key Response for NTLMv2. */
277 void SMBOWFencrypt_ntv2(const uchar kr
[16],
278 const DATA_BLOB
*srv_chal
,
279 const DATA_BLOB
*cli_chal
,
284 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
285 hmac_md5_update(srv_chal
->data
, srv_chal
->length
, &ctx
);
286 hmac_md5_update(cli_chal
->data
, cli_chal
->length
, &ctx
);
287 hmac_md5_final(resp_buf
, &ctx
);
289 #ifdef DEBUG_PASSWORD
290 DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
291 dump_data(100, (const char *)srv_chal
->data
, srv_chal
->length
);
292 dump_data(100, (const char *)cli_chal
->data
, cli_chal
->length
);
293 dump_data(100, (const char *)resp_buf
, 16);
297 void SMBsesskeygen_ntv2(const uchar kr
[16],
298 const uchar
* nt_resp
, uint8 sess_key
[16])
300 /* a very nice, 128 bit, variable session key */
304 hmac_md5_init_limK_to_64(kr
, 16, &ctx
);
305 hmac_md5_update(nt_resp
, 16, &ctx
);
306 hmac_md5_final((unsigned char *)sess_key
, &ctx
);
308 #ifdef DEBUG_PASSWORD
309 DEBUG(100, ("SMBsesskeygen_ntv2:\n"));
310 dump_data(100, (const char *)sess_key
, 16);
314 void SMBsesskeygen_ntv1(const uchar kr
[16],
315 const uchar
* nt_resp
, uint8 sess_key
[16])
317 /* yes, this session key does not change - yes, this
318 is a problem - but it is 128 bits */
320 mdfour((unsigned char *)sess_key
, kr
, 16);
322 #ifdef DEBUG_PASSWORD
323 DEBUG(100, ("SMBsesskeygen_ntv1:\n"));
324 dump_data(100, (const char *)sess_key
, 16);
328 void SMBsesskeygen_lm_sess_key(const uchar lm_hash
[16],
329 const uchar lm_resp
[24], /* only uses 8 */
333 uchar partial_lm_hash
[16];
335 memcpy(partial_lm_hash
, lm_hash
, 8);
336 memset(partial_lm_hash
+ 8, 0xbd, 8);
338 SMBOWFencrypt(partial_lm_hash
, lm_resp
, p24
);
340 memcpy(sess_key
, p24
, 16);
342 #ifdef DEBUG_PASSWORD
343 DEBUG(100, ("SMBsesskeygen_lmv1_jerry:\n"));
344 dump_data(100, (const char *)sess_key
, 16);
348 DATA_BLOB
NTLMv2_generate_names_blob(const char *hostname
,
351 DATA_BLOB names_blob
= data_blob(NULL
, 0);
353 msrpc_gen(&names_blob
, "aaa",
354 NTLMSSP_NAME_TYPE_DOMAIN
, domain
,
355 NTLMSSP_NAME_TYPE_SERVER
, hostname
,
360 static DATA_BLOB
NTLMv2_generate_client_data(const DATA_BLOB
*names_blob
)
362 uchar client_chal
[8];
363 DATA_BLOB response
= data_blob(NULL
, 0);
366 generate_random_buffer(client_chal
, sizeof(client_chal
));
368 put_long_date(long_date
, time(NULL
));
370 /* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
372 msrpc_gen(&response
, "ddbbdb",
373 0x00000101, /* Header */
375 long_date
, 8, /* Timestamp */
376 client_chal
, 8, /* client challenge */
378 names_blob
->data
, names_blob
->length
); /* End of name list */
383 static DATA_BLOB
NTLMv2_generate_response(const uchar ntlm_v2_hash
[16],
384 const DATA_BLOB
*server_chal
,
385 const DATA_BLOB
*names_blob
)
387 uchar ntlmv2_response
[16];
388 DATA_BLOB ntlmv2_client_data
;
389 DATA_BLOB final_response
;
392 /* generate some data to pass into the response function - including
393 the hostname and domain name of the server */
394 ntlmv2_client_data
= NTLMv2_generate_client_data(names_blob
);
396 /* Given that data, and the challenge from the server, generate a response */
397 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &ntlmv2_client_data
, ntlmv2_response
);
399 final_response
= data_blob(NULL
, sizeof(ntlmv2_response
) + ntlmv2_client_data
.length
);
401 memcpy(final_response
.data
, ntlmv2_response
, sizeof(ntlmv2_response
));
403 memcpy(final_response
.data
+sizeof(ntlmv2_response
),
404 ntlmv2_client_data
.data
, ntlmv2_client_data
.length
);
406 data_blob_free(&ntlmv2_client_data
);
408 return final_response
;
411 static DATA_BLOB
LMv2_generate_response(const uchar ntlm_v2_hash
[16],
412 const DATA_BLOB
*server_chal
)
414 uchar lmv2_response
[16];
415 DATA_BLOB lmv2_client_data
= data_blob(NULL
, 8);
416 DATA_BLOB final_response
= data_blob(NULL
, 24);
419 /* client-supplied random data */
420 generate_random_buffer(lmv2_client_data
.data
, lmv2_client_data
.length
);
422 /* Given that data, and the challenge from the server, generate a response */
423 SMBOWFencrypt_ntv2(ntlm_v2_hash
, server_chal
, &lmv2_client_data
, lmv2_response
);
424 memcpy(final_response
.data
, lmv2_response
, sizeof(lmv2_response
));
426 /* after the first 16 bytes is the random data we generated above,
427 so the server can verify us with it */
428 memcpy(final_response
.data
+sizeof(lmv2_response
),
429 lmv2_client_data
.data
, lmv2_client_data
.length
);
431 data_blob_free(&lmv2_client_data
);
433 return final_response
;
436 BOOL
SMBNTLMv2encrypt_hash(const char *user
, const char *domain
, const uchar nt_hash
[16],
437 const DATA_BLOB
*server_chal
,
438 const DATA_BLOB
*names_blob
,
439 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
440 DATA_BLOB
*user_session_key
)
442 uchar ntlm_v2_hash
[16];
444 /* We don't use the NT# directly. Instead we use it mashed up with
445 the username and domain.
446 This prevents username swapping during the auth exchange
448 if (!ntv2_owf_gen(nt_hash
, user
, domain
, False
, ntlm_v2_hash
)) {
453 *nt_response
= NTLMv2_generate_response(ntlm_v2_hash
, server_chal
,
455 if (user_session_key
) {
456 *user_session_key
= data_blob(NULL
, 16);
458 /* The NTLMv2 calculations also provide a session key, for signing etc later */
459 /* use only the first 16 bytes of nt_response for session key */
460 SMBsesskeygen_ntv2(ntlm_v2_hash
, nt_response
->data
, user_session_key
->data
);
467 *lm_response
= LMv2_generate_response(ntlm_v2_hash
, server_chal
);
473 /* Plaintext version of the above. */
475 BOOL
SMBNTLMv2encrypt(const char *user
, const char *domain
, const char *password
,
476 const DATA_BLOB
*server_chal
,
477 const DATA_BLOB
*names_blob
,
478 DATA_BLOB
*lm_response
, DATA_BLOB
*nt_response
,
479 DATA_BLOB
*user_session_key
)
482 E_md4hash(password
, nt_hash
);
484 return SMBNTLMv2encrypt_hash(user
, domain
, nt_hash
,
487 lm_response
, nt_response
,
491 /***********************************************************
492 encode a password buffer with a unicode password. The buffer
493 is filled with random data to make it harder to attack.
494 ************************************************************/
495 BOOL
encode_pw_buffer(uint8 buffer
[516], const char *password
, int string_flags
)
500 /* the incoming buffer can be any alignment. */
501 string_flags
|= STR_NOALIGN
;
503 new_pw_len
= push_string(NULL
, new_pw
,
505 sizeof(new_pw
), string_flags
);
507 memcpy(&buffer
[512 - new_pw_len
], new_pw
, new_pw_len
);
509 generate_random_buffer(buffer
, 512 - new_pw_len
);
512 * The length of the new password is in the last 4 bytes of
515 SIVAL(buffer
, 512, new_pw_len
);
521 /***********************************************************
522 decode a password buffer
523 *new_pw_len is the length in bytes of the possibly mulitbyte
524 returned password including termination.
525 ************************************************************/
527 BOOL
decode_pw_buffer(uint8 in_buffer
[516], char *new_pwrd
,
528 int new_pwrd_size
, uint32
*new_pw_len
,
533 /* the incoming buffer can be any alignment. */
534 string_flags
|= STR_NOALIGN
;
537 Warning !!! : This function is called from some rpc call.
538 The password IN the buffer may be a UNICODE string.
539 The password IN new_pwrd is an ASCII string
540 If you reuse that code somewhere else check first.
543 /* The length of the new password is in the last 4 bytes of the data buffer. */
545 byte_len
= IVAL(in_buffer
, 512);
547 #ifdef DEBUG_PASSWORD
548 dump_data(100, (const char *)in_buffer
, 516);
551 /* Password cannot be longer than the size of the password buffer */
552 if ( (byte_len
< 0) || (byte_len
> 512)) {
553 DEBUG(0, ("decode_pw_buffer: incorrect password length (%d).\n", byte_len
));
554 DEBUG(0, ("decode_pw_buffer: check that 'encrypt passwords = yes'\n"));
558 /* decode into the return buffer. Buffer length supplied */
559 *new_pw_len
= pull_string(NULL
, new_pwrd
, &in_buffer
[512 - byte_len
], new_pwrd_size
,
560 byte_len
, string_flags
);
562 #ifdef DEBUG_PASSWORD
563 DEBUG(100,("decode_pw_buffer: new_pwrd: "));
564 dump_data(100, (const char *)new_pwrd
, *new_pw_len
);
565 DEBUG(100,("multibyte len:%d\n", *new_pw_len
));
566 DEBUG(100,("original char len:%d\n", byte_len
/2));
572 /***********************************************************
573 Decode an arc4 encrypted password change buffer.
574 ************************************************************/
576 void encode_or_decode_arc4_passwd_buffer(unsigned char pw_buf
[532], const DATA_BLOB
*psession_key
)
578 struct MD5Context tctx
;
579 unsigned char key_out
[16];
581 /* Confounder is last 16 bytes. */
584 MD5Update(&tctx
, &pw_buf
[516], 16);
585 MD5Update(&tctx
, psession_key
->data
, psession_key
->length
);
586 MD5Final(key_out
, &tctx
);
587 /* arc4 with key_out. */
588 SamOEMhash(pw_buf
, key_out
, 516);
591 /***********************************************************
592 Encrypt/Decrypt used for LSA secrets and trusted domain
594 ************************************************************/
596 void sess_crypt_blob(DATA_BLOB
*out
, const DATA_BLOB
*in
, const DATA_BLOB
*session_key
, int forward
)
603 uint8 bin
[8], bout
[8], key
[7];
606 memcpy(bin
, &in
->data
[i
], MIN(8, in
->length
-i
));
608 if (k
+ 7 > session_key
->length
) {
609 k
= (session_key
->length
- k
);
611 memcpy(key
, &session_key
->data
[k
], 7);
613 des_crypt56(bout
, bin
, key
, forward
?1:0);
615 memcpy(&out
->data
[i
], bout
, MIN(8, in
->length
-i
));
619 /* Decrypts password-blob with session-key
620 * @param pass password for session-key
621 * @param data_in DATA_BLOB encrypted password
623 * Returns cleartext password in CH_UNIX
624 * Caller must free the returned string
627 char *decrypt_trustdom_secret(const char *pass
, DATA_BLOB
*data_in
)
629 DATA_BLOB data_out
, sess_key
;
633 fstring cleartextpwd
;
635 if (!data_in
|| !pass
)
638 /* generate md4 password-hash derived from the NT UNICODE password */
639 E_md4hash(pass
, nt_hash
);
641 /* hashed twice with md4 */
642 mdfour(nt_hash
, nt_hash
, 16);
644 /* 16-Byte session-key */
645 sess_key
= data_blob(nt_hash
, 16);
646 if (sess_key
.data
== NULL
)
649 data_out
= data_blob(NULL
, data_in
->length
);
650 if (data_out
.data
== NULL
)
653 /* decrypt with des3 */
654 sess_crypt_blob(&data_out
, data_in
, &sess_key
, 0);
656 /* 4 Byte length, 4 Byte version */
657 length
= IVAL(data_out
.data
, 0);
658 version
= IVAL(data_out
.data
, 4);
660 if (length
> data_in
->length
- 8) {
661 DEBUG(0,("decrypt_trustdom_secret: invalid length (%d)\n", length
));
666 DEBUG(0,("decrypt_trustdom_secret: unknown version number (%d)\n", version
));
670 rpcstr_pull(cleartextpwd
, data_out
.data
+ 8, sizeof(fstring
), length
, 0 );
672 #ifdef DEBUG_PASSWORD
673 DEBUG(100,("decrypt_trustdom_secret: length is: %d, version is: %d, password is: %s\n",
674 length
, version
, cleartextpwd
));
677 data_blob_free(&data_out
);
678 data_blob_free(&sess_key
);
680 return SMB_STRDUP(cleartextpwd
);