2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
5 Copyright (C) Gerald Carter 2003
6 Copyright (C) Luke Kenneth Casson Leighton 1996-2000
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "lib/crypto/crypto.h"
24 #include "librpc/gen_ndr/netlogon.h"
25 #include "libcli/auth/libcli_auth.h"
26 #include "param/param.h"
27 #include "auth/ntlm/ntlm_check.h"
29 /****************************************************************************
30 Core of smb password checking routine.
31 ****************************************************************************/
33 static bool smb_pwd_check_ntlmv1(TALLOC_CTX *mem_ctx,
34 const DATA_BLOB *nt_response,
35 const uint8_t *part_passwd,
36 const DATA_BLOB *sec_blob,
37 DATA_BLOB *user_sess_key)
39 /* Finish the encryption of part_passwd. */
42 if (part_passwd == NULL) {
43 DEBUG(10,("No password set - DISALLOWING access\n"));
44 /* No password set - always false ! */
48 if (sec_blob->length != 8) {
49 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect challenge size (%lu)\n",
50 (unsigned long)sec_blob->length));
54 if (nt_response->length != 24) {
55 DEBUG(0, ("smb_pwd_check_ntlmv1: incorrect password length (%lu)\n",
56 (unsigned long)nt_response->length));
60 SMBOWFencrypt(part_passwd, sec_blob->data, p24);
63 DEBUG(100,("Part password (P16) was |\n"));
64 dump_data(100, part_passwd, 16);
65 DEBUGADD(100,("Password from client was |\n"));
66 dump_data(100, nt_response->data, nt_response->length);
67 DEBUGADD(100,("Given challenge was |\n"));
68 dump_data(100, sec_blob->data, sec_blob->length);
69 DEBUGADD(100,("Value from encryption was |\n"));
70 dump_data(100, p24, 24);
72 if (memcmp(p24, nt_response->data, 24) == 0) {
73 if (user_sess_key != NULL) {
74 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
75 SMBsesskeygen_ntv1(part_passwd, user_sess_key->data);
82 /****************************************************************************
83 Core of smb password checking routine. (NTLMv2, LMv2)
84 Note: The same code works with both NTLMv2 and LMv2.
85 ****************************************************************************/
87 static bool smb_pwd_check_ntlmv2(TALLOC_CTX *mem_ctx,
88 const DATA_BLOB *ntv2_response,
89 const uint8_t *part_passwd,
90 const DATA_BLOB *sec_blob,
91 const char *user, const char *domain,
92 bool upper_case_domain, /* should the domain be transformed into upper case? */
93 DATA_BLOB *user_sess_key)
95 /* Finish the encryption of part_passwd. */
97 uint8_t value_from_encryption[16];
98 DATA_BLOB client_key_data;
100 if (part_passwd == NULL) {
101 DEBUG(10,("No password set - DISALLOWING access\n"));
102 /* No password set - always false */
106 if (sec_blob->length != 8) {
107 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect challenge size (%lu)\n",
108 (unsigned long)sec_blob->length));
112 if (ntv2_response->length < 24) {
113 /* We MUST have more than 16 bytes, or the stuff below will go
114 crazy. No known implementation sends less than the 24 bytes
115 for LMv2, let alone NTLMv2. */
116 DEBUG(0, ("smb_pwd_check_ntlmv2: incorrect password length (%lu)\n",
117 (unsigned long)ntv2_response->length));
121 client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
123 todo: should we be checking this for anything? We can't for LMv2,
124 but for NTLMv2 it is meant to contain the current time etc.
127 if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
131 SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
134 DEBUG(100,("Part password (P16) was |\n"));
135 dump_data(100, part_passwd, 16);
136 DEBUGADD(100,("Password from client was |\n"));
137 dump_data(100, ntv2_response->data, ntv2_response->length);
138 DEBUGADD(100,("Variable data from client was |\n"));
139 dump_data(100, client_key_data.data, client_key_data.length);
140 DEBUGADD(100,("Given challenge was |\n"));
141 dump_data(100, sec_blob->data, sec_blob->length);
142 DEBUGADD(100,("Value from encryption was |\n"));
143 dump_data(100, value_from_encryption, 16);
145 data_blob_clear_free(&client_key_data);
146 if (memcmp(value_from_encryption, ntv2_response->data, 16) == 0) {
147 if (user_sess_key != NULL) {
148 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
149 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
156 /****************************************************************************
157 Core of smb password checking routine. (NTLMv2, LMv2)
158 Note: The same code works with both NTLMv2 and LMv2.
159 ****************************************************************************/
161 static bool smb_sess_key_ntlmv2(TALLOC_CTX *mem_ctx,
162 const DATA_BLOB *ntv2_response,
163 const uint8_t *part_passwd,
164 const DATA_BLOB *sec_blob,
165 const char *user, const char *domain,
166 bool upper_case_domain, /* should the domain be transformed into upper case? */
167 DATA_BLOB *user_sess_key)
169 /* Finish the encryption of part_passwd. */
171 uint8_t value_from_encryption[16];
172 DATA_BLOB client_key_data;
174 if (part_passwd == NULL) {
175 DEBUG(10,("No password set - DISALLOWING access\n"));
176 /* No password set - always false */
180 if (sec_blob->length != 8) {
181 DEBUG(0, ("smb_sess_key_ntlmv2: incorrect challenge size (%lu)\n",
182 (unsigned long)sec_blob->length));
186 if (ntv2_response->length < 24) {
187 /* We MUST have more than 16 bytes, or the stuff below will go
188 crazy. No known implementation sends less than the 24 bytes
189 for LMv2, let alone NTLMv2. */
190 DEBUG(0, ("smb_sess_key_ntlmv2: incorrect password length (%lu)\n",
191 (unsigned long)ntv2_response->length));
195 client_key_data = data_blob_talloc(mem_ctx, ntv2_response->data+16, ntv2_response->length-16);
197 if (!ntv2_owf_gen(part_passwd, user, domain, upper_case_domain, kr)) {
201 SMBOWFencrypt_ntv2(kr, sec_blob, &client_key_data, value_from_encryption);
202 *user_sess_key = data_blob_talloc(mem_ctx, NULL, 16);
203 SMBsesskeygen_ntv2(kr, value_from_encryption, user_sess_key->data);
208 * Compare password hashes against those from the SAM
210 * @param mem_ctx talloc context
211 * @param client_lanman LANMAN password hash, as supplied by the client
212 * @param client_nt NT (MD4) password hash, as supplied by the client
213 * @param username internal Samba username, for log messages
214 * @param client_username username the client used
215 * @param client_domain domain name the client used (may be mapped)
216 * @param stored_lanman LANMAN password hash, as stored on the SAM
217 * @param stored_nt NT (MD4) password hash, as stored on the SAM
218 * @param user_sess_key User session key
219 * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
222 NTSTATUS hash_password_check(TALLOC_CTX *mem_ctx,
223 struct loadparm_context *lp_ctx,
224 const struct samr_Password *client_lanman,
225 const struct samr_Password *client_nt,
226 const char *username,
227 const struct samr_Password *stored_lanman,
228 const struct samr_Password *stored_nt)
230 if (stored_nt == NULL) {
231 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
235 if (client_nt && stored_nt) {
236 if (memcmp(client_nt->hash, stored_nt->hash, sizeof(stored_nt->hash)) == 0) {
239 DEBUG(3,("ntlm_password_check: Interactive logon: NT password check failed for user %s\n",
241 return NT_STATUS_WRONG_PASSWORD;
244 } else if (client_lanman && stored_lanman) {
245 if (!lp_lanman_auth(lp_ctx)) {
246 DEBUG(3,("ntlm_password_check: Interactive logon: only LANMAN password supplied for user %s, and LM passwords are disabled!\n",
248 return NT_STATUS_WRONG_PASSWORD;
250 if (strchr_m(username, '@')) {
251 return NT_STATUS_NOT_FOUND;
254 if (memcmp(client_lanman->hash, stored_lanman->hash, sizeof(stored_lanman->hash)) == 0) {
257 DEBUG(3,("ntlm_password_check: Interactive logon: LANMAN password check failed for user %s\n",
259 return NT_STATUS_WRONG_PASSWORD;
262 if (strchr_m(username, '@')) {
263 return NT_STATUS_NOT_FOUND;
265 return NT_STATUS_WRONG_PASSWORD;
269 * Check a challenge-response password against the value of the NT or
272 * @param mem_ctx talloc context
273 * @param challenge 8-byte challenge. If all zero, forces plaintext comparison
274 * @param nt_response 'unicode' NT response to the challenge, or unicode password
275 * @param lm_response ASCII or LANMAN response to the challenge, or password in DOS code page
276 * @param username internal Samba username, for log messages
277 * @param client_username username the client used
278 * @param client_domain domain name the client used (may be mapped)
279 * @param stored_lanman LANMAN ASCII password from our passdb or similar
280 * @param stored_nt MD4 unicode password from our passdb or similar
281 * @param user_sess_key User session key
282 * @param lm_sess_key LM session key (first 8 bytes of the LM hash)
285 NTSTATUS ntlm_password_check(TALLOC_CTX *mem_ctx,
286 struct loadparm_context *lp_ctx,
287 uint32_t logon_parameters,
288 const DATA_BLOB *challenge,
289 const DATA_BLOB *lm_response,
290 const DATA_BLOB *nt_response,
291 const char *username,
292 const char *client_username,
293 const char *client_domain,
294 const struct samr_Password *stored_lanman,
295 const struct samr_Password *stored_nt,
296 DATA_BLOB *user_sess_key,
297 DATA_BLOB *lm_sess_key)
299 const static uint8_t zeros[8];
300 DATA_BLOB tmp_sess_key;
302 if (stored_nt == NULL) {
303 DEBUG(3,("ntlm_password_check: NO NT password stored for user %s.\n",
307 *lm_sess_key = data_blob(NULL, 0);
308 *user_sess_key = data_blob(NULL, 0);
310 /* Check for cleartext netlogon. Used by Exchange 5.5. */
311 if ((logon_parameters & MSV1_0_CLEARTEXT_PASSWORD_ALLOWED)
312 && challenge->length == sizeof(zeros)
313 && (memcmp(challenge->data, zeros, challenge->length) == 0 )) {
314 struct samr_Password client_nt;
315 struct samr_Password client_lm;
316 char *unix_pw = NULL;
319 DEBUG(4,("ntlm_password_check: checking plaintext passwords for user %s\n",
321 mdfour(client_nt.hash, nt_response->data, nt_response->length);
323 if (lm_response->length &&
324 (convert_string_talloc(mem_ctx, lp_iconv_convenience(lp_ctx), CH_DOS, CH_UNIX,
325 lm_response->data, lm_response->length,
326 (void **)&unix_pw) != -1)) {
327 if (E_deshash(unix_pw, client_lm.hash)) {
335 return hash_password_check(mem_ctx,
337 lm_ok ? &client_lm : NULL,
338 nt_response->length ? &client_nt : NULL,
340 stored_lanman, stored_nt);
343 if (nt_response->length != 0 && nt_response->length < 24) {
344 DEBUG(2,("ntlm_password_check: invalid NT password length (%lu) for user %s\n",
345 (unsigned long)nt_response->length, username));
348 if (nt_response->length > 24 && stored_nt) {
349 /* We have the NT MD4 hash challenge available - see if we can
352 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with domain [%s]\n", client_domain));
353 if (smb_pwd_check_ntlmv2(mem_ctx,
355 stored_nt->hash, challenge,
360 *lm_sess_key = *user_sess_key;
361 if (user_sess_key->length) {
362 lm_sess_key->length = 8;
367 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password with uppercased version of domain [%s]\n", client_domain));
368 if (smb_pwd_check_ntlmv2(mem_ctx,
370 stored_nt->hash, challenge,
375 *lm_sess_key = *user_sess_key;
376 if (user_sess_key->length) {
377 lm_sess_key->length = 8;
382 DEBUG(4,("ntlm_password_check: Checking NTLMv2 password without a domain\n"));
383 if (smb_pwd_check_ntlmv2(mem_ctx,
385 stored_nt->hash, challenge,
390 *lm_sess_key = *user_sess_key;
391 if (user_sess_key->length) {
392 lm_sess_key->length = 8;
396 DEBUG(3,("ntlm_password_check: NTLMv2 password check failed\n"));
398 } else if (nt_response->length == 24 && stored_nt) {
399 if (lp_ntlm_auth(lp_ctx)) {
400 /* We have the NT MD4 hash challenge available - see if we can
401 use it (ie. does it exist in the smbpasswd file).
403 DEBUG(4,("ntlm_password_check: Checking NT MD4 password\n"));
404 if (smb_pwd_check_ntlmv1(mem_ctx,
406 stored_nt->hash, challenge,
408 /* The LM session key for this response is not very secure,
409 so use it only if we otherwise allow LM authentication */
411 if (lp_lanman_auth(lp_ctx) && stored_lanman) {
412 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
416 DEBUG(3,("ntlm_password_check: NT MD4 password check failed for user %s\n",
418 return NT_STATUS_WRONG_PASSWORD;
421 DEBUG(2,("ntlm_password_check: NTLMv1 passwords NOT PERMITTED for user %s\n",
423 /* no return, becouse we might pick up LMv2 in the LM field */
427 if (lm_response->length == 0) {
428 DEBUG(3,("ntlm_password_check: NEITHER LanMan nor NT password supplied for user %s\n",
430 return NT_STATUS_WRONG_PASSWORD;
433 if (lm_response->length < 24) {
434 DEBUG(2,("ntlm_password_check: invalid LanMan password length (%lu) for user %s\n",
435 (unsigned long)nt_response->length, username));
436 return NT_STATUS_WRONG_PASSWORD;
439 if (!lp_lanman_auth(lp_ctx)) {
440 DEBUG(3,("ntlm_password_check: Lanman passwords NOT PERMITTED for user %s\n",
442 } else if (!stored_lanman) {
443 DEBUG(3,("ntlm_password_check: NO LanMan password set for user %s (and no NT password supplied)\n",
445 } else if (strchr_m(username, '@')) {
446 DEBUG(3,("ntlm_password_check: NO LanMan password allowed for username@realm logins (user: %s)\n",
449 DEBUG(4,("ntlm_password_check: Checking LM password\n"));
450 if (smb_pwd_check_ntlmv1(mem_ctx,
452 stored_lanman->hash, challenge,
454 /* The session key for this response is still very odd.
455 It not very secure, so use it only if we otherwise
456 allow LM authentication */
458 if (lp_lanman_auth(lp_ctx) && stored_lanman) {
459 uint8_t first_8_lm_hash[16];
460 memcpy(first_8_lm_hash, stored_lanman->hash, 8);
461 memset(first_8_lm_hash + 8, '\0', 8);
462 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
463 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
470 DEBUG(4,("ntlm_password_check: LM password check failed for user, no NT password %s\n",username));
471 return NT_STATUS_WRONG_PASSWORD;
474 /* This is for 'LMv2' authentication. almost NTLMv2 but limited to 24 bytes.
475 - related to Win9X, legacy NAS pass-though authentication
477 DEBUG(4,("ntlm_password_check: Checking LMv2 password with domain %s\n", client_domain));
478 if (smb_pwd_check_ntlmv2(mem_ctx,
480 stored_nt->hash, challenge,
485 if (nt_response->length > 24) {
486 /* If NTLMv2 authentication has preceeded us
487 * (even if it failed), then use the session
488 * key from that. See the RPC-SAMLOGON
490 smb_sess_key_ntlmv2(mem_ctx,
492 stored_nt->hash, challenge,
498 /* Otherwise, use the LMv2 session key */
499 *user_sess_key = tmp_sess_key;
501 *lm_sess_key = *user_sess_key;
502 if (user_sess_key->length) {
503 lm_sess_key->length = 8;
508 DEBUG(4,("ntlm_password_check: Checking LMv2 password with upper-cased version of domain %s\n", client_domain));
509 if (smb_pwd_check_ntlmv2(mem_ctx,
511 stored_nt->hash, challenge,
516 if (nt_response->length > 24) {
517 /* If NTLMv2 authentication has preceeded us
518 * (even if it failed), then use the session
519 * key from that. See the RPC-SAMLOGON
521 smb_sess_key_ntlmv2(mem_ctx,
523 stored_nt->hash, challenge,
529 /* Otherwise, use the LMv2 session key */
530 *user_sess_key = tmp_sess_key;
532 *lm_sess_key = *user_sess_key;
533 if (user_sess_key->length) {
534 lm_sess_key->length = 8;
539 DEBUG(4,("ntlm_password_check: Checking LMv2 password without a domain\n"));
540 if (smb_pwd_check_ntlmv2(mem_ctx,
542 stored_nt->hash, challenge,
547 if (nt_response->length > 24) {
548 /* If NTLMv2 authentication has preceeded us
549 * (even if it failed), then use the session
550 * key from that. See the RPC-SAMLOGON
552 smb_sess_key_ntlmv2(mem_ctx,
554 stored_nt->hash, challenge,
560 /* Otherwise, use the LMv2 session key */
561 *user_sess_key = tmp_sess_key;
563 *lm_sess_key = *user_sess_key;
564 if (user_sess_key->length) {
565 lm_sess_key->length = 8;
570 /* Apparently NT accepts NT responses in the LM field
571 - I think this is related to Win9X pass-though authentication
573 DEBUG(4,("ntlm_password_check: Checking NT MD4 password in LM field\n"));
574 if (lp_ntlm_auth(lp_ctx)) {
575 if (smb_pwd_check_ntlmv1(mem_ctx,
577 stored_nt->hash, challenge,
579 /* The session key for this response is still very odd.
580 It not very secure, so use it only if we otherwise
581 allow LM authentication */
583 if (lp_lanman_auth(lp_ctx) && stored_lanman) {
584 uint8_t first_8_lm_hash[16];
585 memcpy(first_8_lm_hash, stored_lanman->hash, 8);
586 memset(first_8_lm_hash + 8, '\0', 8);
587 *user_sess_key = data_blob_talloc(mem_ctx, first_8_lm_hash, 16);
588 *lm_sess_key = data_blob_talloc(mem_ctx, stored_lanman->hash, 8);
592 DEBUG(3,("ntlm_password_check: LM password, NT MD4 password in LM field and LMv2 failed for user %s\n",username));
594 DEBUG(3,("ntlm_password_check: LM password and LMv2 failed for user %s, and NT MD4 password in LM field not permitted\n",username));
597 /* Try and match error codes */
598 if (strchr_m(username, '@')) {
599 return NT_STATUS_NOT_FOUND;
601 return NT_STATUS_WRONG_PASSWORD;