1 /*
2 Unix SMB/CIFS implementation.
3 Password and authentication handling
4 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2009
5 Copyright (C) Gerald Carter 2003
6 Copyright (C) Stefan Metzmacher 2005
7
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.
12
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.
17
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/>.
20 */
21
22 #include "includes.h"
23 #include "system/time.h"
24 #include <ldb.h>
25 #include "libcli/ldap/ldap_ndr.h"
26 #include "libcli/security/security.h"
27 #include "auth/auth.h"
28 #include "../libcli/auth/ntlm_check.h"
29 #include "auth/ntlm/auth_proto.h"
30 #include "auth/auth_sam.h"
31 #include "dsdb/samdb/samdb.h"
32 #include "dsdb/common/util.h"
33 #include "param/param.h"
34 #include "librpc/gen_ndr/ndr_irpc_c.h"
35 #include "librpc/gen_ndr/ndr_winbind_c.h"
36 #include "lib/messaging/irpc.h"
37 #include "libcli/auth/libcli_auth.h"
38 #include "libds/common/roles.h"
39
40 #undef DBGC_CLASS
41 #define DBGC_CLASS DBGC_AUTH
42
43 NTSTATUS auth_sam_init(void);
44
45 extern const char *user_attrs[];
46 extern const char *domain_ref_attrs[];
47
48 /****************************************************************************
49 Do a specific test for an smb password being correct, given a smb_password and
50 the lanman and NT responses.
51 ****************************************************************************/
authsam_password_ok(struct auth4_context * auth_context,TALLOC_CTX * mem_ctx,uint16_t acct_flags,const struct samr_Password * lm_pwd,const struct samr_Password * nt_pwd,const struct auth_usersupplied_info * user_info,DATA_BLOB * user_sess_key,DATA_BLOB * lm_sess_key)52 static NTSTATUS authsam_password_ok(struct auth4_context *auth_context,
53 TALLOC_CTX *mem_ctx,
54 uint16_t acct_flags,
55 const struct samr_Password *lm_pwd,
56 const struct samr_Password *nt_pwd,
57 const struct auth_usersupplied_info *user_info,
58 DATA_BLOB *user_sess_key,
59 DATA_BLOB *lm_sess_key)
60 {
61 NTSTATUS status;
62
63 switch (user_info->password_state) {
64 case AUTH_PASSWORD_PLAIN:
65 {
66 const struct auth_usersupplied_info *user_info_temp;
67 status = encrypt_user_info(mem_ctx, auth_context,
68 AUTH_PASSWORD_HASH,
69 user_info, &user_info_temp);
70 if (!NT_STATUS_IS_OK(status)) {
71 DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
72 return status;
73 }
74 user_info = user_info_temp;
75
76 FALL_THROUGH;
77 }
78 case AUTH_PASSWORD_HASH:
79 *lm_sess_key = data_blob(NULL, 0);
80 *user_sess_key = data_blob(NULL, 0);
81 status = hash_password_check(mem_ctx,
82 lpcfg_lanman_auth(auth_context->lp_ctx),
83 user_info->password.hash.lanman,
84 user_info->password.hash.nt,
85 user_info->mapped.account_name,
86 lm_pwd, nt_pwd);
87 NT_STATUS_NOT_OK_RETURN(status);
88 break;
89
90 case AUTH_PASSWORD_RESPONSE:
91 status = ntlm_password_check(mem_ctx,
92 lpcfg_lanman_auth(auth_context->lp_ctx),
93 lpcfg_ntlm_auth(auth_context->lp_ctx),
94 user_info->logon_parameters,
95 &auth_context->challenge.data,
96 &user_info->password.response.lanman,
97 &user_info->password.response.nt,
98 user_info->mapped.account_name,
99 user_info->client.account_name,
100 user_info->client.domain_name,
101 lm_pwd, nt_pwd,
102 user_sess_key, lm_sess_key);
103 NT_STATUS_NOT_OK_RETURN(status);
104 break;
105 }
106
107 return NT_STATUS_OK;
108 }
109
auth_sam_trigger_zero_password(TALLOC_CTX * mem_ctx,struct imessaging_context * msg_ctx,struct tevent_context * event_ctx,struct netr_SendToSamBase * send_to_sam)110 static void auth_sam_trigger_zero_password(TALLOC_CTX *mem_ctx,
111 struct imessaging_context *msg_ctx,
112 struct tevent_context *event_ctx,
113 struct netr_SendToSamBase *send_to_sam)
114 {
115 struct dcerpc_binding_handle *irpc_handle;
116 struct winbind_SendToSam r;
117 struct tevent_req *req;
118 TALLOC_CTX *tmp_ctx;
119
120 tmp_ctx = talloc_new(mem_ctx);
121 if (tmp_ctx == NULL) {
122 return;
123 }
124
125 irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
126 "winbind_server",
127 &ndr_table_winbind);
128 if (irpc_handle == NULL) {
129 DEBUG(1,(__location__ ": Unable to get binding handle for winbind\n"));
130 TALLOC_FREE(tmp_ctx);
131 return;
132 }
133
134 r.in.message = *send_to_sam;
135
136 /*
137 * This seem to rely on the current IRPC implementation,
138 * which delivers the message in the _send function.
139 *
140 * TODO: we need a ONE_WAY IRPC handle and register
141 * a callback and wait for it to be triggered!
142 */
143 req = dcerpc_winbind_SendToSam_r_send(tmp_ctx,
144 event_ctx,
145 irpc_handle,
146 &r);
147
148 /* we aren't interested in a reply */
149 talloc_free(req);
150 TALLOC_FREE(tmp_ctx);
151
152 }
153
154 /*
155 send a message to the drepl server telling it to initiate a
156 REPL_SECRET getncchanges extended op to fetch the users secrets
157 */
auth_sam_trigger_repl_secret(TALLOC_CTX * mem_ctx,struct imessaging_context * msg_ctx,struct tevent_context * event_ctx,struct ldb_dn * user_dn)158 static void auth_sam_trigger_repl_secret(TALLOC_CTX *mem_ctx,
159 struct imessaging_context *msg_ctx,
160 struct tevent_context *event_ctx,
161 struct ldb_dn *user_dn)
162 {
163 struct dcerpc_binding_handle *irpc_handle;
164 struct drepl_trigger_repl_secret r;
165 struct tevent_req *req;
166 TALLOC_CTX *tmp_ctx;
167
168 tmp_ctx = talloc_new(mem_ctx);
169 if (tmp_ctx == NULL) {
170 return;
171 }
172
173 irpc_handle = irpc_binding_handle_by_name(tmp_ctx, msg_ctx,
174 "dreplsrv",
175 &ndr_table_irpc);
176 if (irpc_handle == NULL) {
177 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
178 TALLOC_FREE(tmp_ctx);
179 return;
180 }
181
182 r.in.user_dn = ldb_dn_get_linearized(user_dn);
183
184 /*
185 * This seem to rely on the current IRPC implementation,
186 * which delivers the message in the _send function.
187 *
188 * TODO: we need a ONE_WAY IRPC handle and register
189 * a callback and wait for it to be triggered!
190 */
191 req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
192 event_ctx,
193 irpc_handle,
194 &r);
195
196 /* we aren't interested in a reply */
197 talloc_free(req);
198 TALLOC_FREE(tmp_ctx);
199 }
200
201
202 /*
203 * Check that a password is OK, and update badPwdCount if required.
204 */
205
authsam_password_check_and_record(struct auth4_context * auth_context,TALLOC_CTX * mem_ctx,struct ldb_dn * domain_dn,struct ldb_message * msg,uint16_t acct_flags,const struct auth_usersupplied_info * user_info,DATA_BLOB * user_sess_key,DATA_BLOB * lm_sess_key,bool * authoritative)206 static NTSTATUS authsam_password_check_and_record(struct auth4_context *auth_context,
207 TALLOC_CTX *mem_ctx,
208 struct ldb_dn *domain_dn,
209 struct ldb_message *msg,
210 uint16_t acct_flags,
211 const struct auth_usersupplied_info *user_info,
212 DATA_BLOB *user_sess_key,
213 DATA_BLOB *lm_sess_key,
214 bool *authoritative)
215 {
216 NTSTATUS nt_status;
217 NTSTATUS auth_status;
218 TALLOC_CTX *tmp_ctx;
219 int i, ret;
220 int history_len = 0;
221 struct ldb_context *sam_ctx = auth_context->sam_ctx;
222 const char * const attrs[] = { "pwdHistoryLength", NULL };
223 struct ldb_message *dom_msg;
224 struct samr_Password *lm_pwd;
225 struct samr_Password *nt_pwd;
226 bool am_rodc;
227
228 tmp_ctx = talloc_new(mem_ctx);
229 if (tmp_ctx == NULL) {
230 return NT_STATUS_NO_MEMORY;
231 }
232
233 /*
234 * This call does more than what it appears to do, it also
235 * checks for the account lockout.
236 *
237 * It is done here so that all parts of Samba that read the
238 * password refuse to even operate on it if the account is
239 * locked out, to avoid mistakes like CVE-2013-4496.
240 */
241 nt_status = samdb_result_passwords(tmp_ctx, auth_context->lp_ctx,
242 msg, &lm_pwd, &nt_pwd);
243 if (!NT_STATUS_IS_OK(nt_status)) {
244 TALLOC_FREE(tmp_ctx);
245 return nt_status;
246 }
247
248 if (lm_pwd == NULL && nt_pwd == NULL) {
249 if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
250 /*
251 * we don't have passwords for this
252 * account. We are an RODC, and this account
253 * may be one for which we either are denied
254 * REPL_SECRET replication or we haven't yet
255 * done the replication. We return
256 * NT_STATUS_NOT_IMPLEMENTED which tells the
257 * auth code to try the next authentication
258 * mechanism. We also send a message to our
259 * drepl server to tell it to try and
260 * replicate the secrets for this account.
261 *
262 * TODO: Should we only trigger this is detected
263 * there's a chance that the password might be
264 * replicated, we should be able to detect this
265 * based on msDS-NeverRevealGroup.
266 */
267 auth_sam_trigger_repl_secret(auth_context,
268 auth_context->msg_ctx,
269 auth_context->event_ctx,
270 msg->dn);
271 TALLOC_FREE(tmp_ctx);
272 return NT_STATUS_NOT_IMPLEMENTED;
273 }
274 }
275
276 auth_status = authsam_password_ok(auth_context, tmp_ctx,
277 acct_flags,
278 lm_pwd, nt_pwd,
279 user_info,
280 user_sess_key, lm_sess_key);
281 if (NT_STATUS_IS_OK(auth_status)) {
282 if (user_sess_key->data) {
283 talloc_steal(mem_ctx, user_sess_key->data);
284 }
285 if (lm_sess_key->data) {
286 talloc_steal(mem_ctx, lm_sess_key->data);
287 }
288 TALLOC_FREE(tmp_ctx);
289 return NT_STATUS_OK;
290 }
291 *user_sess_key = data_blob_null;
292 *lm_sess_key = data_blob_null;
293
294 if (!NT_STATUS_EQUAL(auth_status, NT_STATUS_WRONG_PASSWORD)) {
295 TALLOC_FREE(tmp_ctx);
296 return auth_status;
297 }
298
299 /*
300 * We only continue if this was a wrong password
301 * and we'll always return NT_STATUS_WRONG_PASSWORD
302 * no matter what error happens.
303 */
304
305 /* pull the domain password property attributes */
306 ret = dsdb_search_one(sam_ctx, tmp_ctx, &dom_msg, domain_dn, LDB_SCOPE_BASE,
307 attrs, 0, "objectClass=domain");
308 if (ret == LDB_SUCCESS) {
309 history_len = ldb_msg_find_attr_as_uint(dom_msg, "pwdHistoryLength", 0);
310 } else if (ret == LDB_ERR_NO_SUCH_OBJECT) {
311 DEBUG(3,("Couldn't find domain %s: %s!\n",
312 ldb_dn_get_linearized(domain_dn),
313 ldb_errstring(sam_ctx)));
314 } else {
315 DEBUG(3,("error finding domain %s: %s!\n",
316 ldb_dn_get_linearized(domain_dn),
317 ldb_errstring(sam_ctx)));
318 }
319
320 for (i = 1; i < MIN(history_len, 3); i++) {
321 struct samr_Password zero_string_hash;
322 struct samr_Password zero_string_des_hash;
323 struct samr_Password *nt_history_pwd = NULL;
324 struct samr_Password *lm_history_pwd = NULL;
325 NTTIME pwdLastSet;
326 struct timeval tv_now;
327 NTTIME now;
328 int allowed_period_mins;
329 NTTIME allowed_period;
330
331 nt_status = samdb_result_passwords_from_history(tmp_ctx,
332 auth_context->lp_ctx,
333 msg, i,
334 &lm_history_pwd,
335 &nt_history_pwd);
336 if (!NT_STATUS_IS_OK(nt_status)) {
337 /*
338 * If we don't find element 'i' we won't find
339 * 'i+1' ...
340 */
341 break;
342 }
343
344 /*
345 * We choose to avoid any issues
346 * around different LM and NT history
347 * lengths by only checking the NT
348 * history
349 */
350 if (nt_history_pwd == NULL) {
351 /*
352 * If we don't find element 'i' we won't find
353 * 'i+1' ...
354 */
355 break;
356 }
357
358 /* Skip over all-zero hashes in the history */
359 if (all_zero(nt_history_pwd->hash,
360 sizeof(nt_history_pwd->hash))) {
361 continue;
362 }
363
364 /*
365 * This looks odd, but the password_hash module writes this in if
366 * (somehow) we didn't have an old NT hash
367 */
368
369 E_md4hash("", zero_string_hash.hash);
370 if (memcmp(nt_history_pwd->hash, zero_string_hash.hash, 16) == 0) {
371 continue;
372 }
373
374 E_deshash("", zero_string_des_hash.hash);
375 if (!lm_history_pwd || memcmp(lm_history_pwd->hash, zero_string_des_hash.hash, 16) == 0) {
376 lm_history_pwd = NULL;
377 }
378
379 auth_status = authsam_password_ok(auth_context, tmp_ctx,
380 acct_flags,
381 lm_history_pwd,
382 nt_history_pwd,
383 user_info,
384 user_sess_key,
385 lm_sess_key);
386 if (!NT_STATUS_IS_OK(auth_status)) {
387 /*
388 * If this was not a correct password, try the next
389 * one from the history
390 */
391 *user_sess_key = data_blob_null;
392 *lm_sess_key = data_blob_null;
393 continue;
394 }
395
396 if (i != 1) {
397 /*
398 * The authentication was OK, but not against
399 * the previous password, which is stored at index 1.
400 *
401 * We just return the original wrong password.
402 * This skips the update of the bad pwd count,
403 * because this is almost certainly user error
404 * (or automatic login on a computer using a cached
405 * password from before the password change),
406 * not an attack.
407 */
408 TALLOC_FREE(tmp_ctx);
409 return NT_STATUS_WRONG_PASSWORD;
410 }
411
412 if (user_info->password_state != AUTH_PASSWORD_RESPONSE) {
413 /*
414 * The authentication was OK against the previous password,
415 * but it's not a NTLM network authentication.
416 *
417 * We just return the original wrong password.
418 * This skips the update of the bad pwd count,
419 * because this is almost certainly user error
420 * (or automatic login on a computer using a cached
421 * password from before the password change),
422 * not an attack.
423 */
424 TALLOC_FREE(tmp_ctx);
425 return NT_STATUS_WRONG_PASSWORD;
426 }
427
428 /*
429 * If the password was OK, it's a NTLM network authentication
430 * and it was the previous password.
431 *
432 * Now we see if it is within the grace period,
433 * so that we don't break cached sessions on other computers
434 * before the user can lock and unlock their other screens
435 * (resetting their cached password).
436 *
437 * See http://support.microsoft.com/kb/906305
438 * OldPasswordAllowedPeriod ("old password allowed period")
439 * is specified in minutes. The default is 60.
440 */
441 allowed_period_mins = lpcfg_old_password_allowed_period(auth_context->lp_ctx);
442 /*
443 * NTTIME uses 100ns units
444 */
445 allowed_period = allowed_period_mins * 60 * 1000*1000*10;
446 pwdLastSet = samdb_result_nttime(msg, "pwdLastSet", 0);
447 tv_now = timeval_current();
448 now = timeval_to_nttime(&tv_now);
449
450 if (now < pwdLastSet) {
451 /*
452 * time jump?
453 *
454 * We just return the original wrong password.
455 * This skips the update of the bad pwd count,
456 * because this is almost certainly user error
457 * (or automatic login on a computer using a cached
458 * password from before the password change),
459 * not an attack.
460 */
461 TALLOC_FREE(tmp_ctx);
462 return NT_STATUS_WRONG_PASSWORD;
463 }
464
465 if ((now - pwdLastSet) >= allowed_period) {
466 /*
467 * The allowed period is over.
468 *
469 * We just return the original wrong password.
470 * This skips the update of the bad pwd count,
471 * because this is almost certainly user error
472 * (or automatic login on a computer using a cached
473 * password from before the password change),
474 * not an attack.
475 */
476 TALLOC_FREE(tmp_ctx);
477 return NT_STATUS_WRONG_PASSWORD;
478 }
479
480 /*
481 * We finally allow the authentication with the
482 * previous password within the allowed period.
483 */
484 if (user_sess_key->data) {
485 talloc_steal(mem_ctx, user_sess_key->data);
486 }
487 if (lm_sess_key->data) {
488 talloc_steal(mem_ctx, lm_sess_key->data);
489 }
490
491 TALLOC_FREE(tmp_ctx);
492 return auth_status;
493 }
494
495 /*
496 * If we are not in the allowed period or match an old password,
497 * we didn't return early. Now update the badPwdCount et al.
498 */
499 nt_status = authsam_update_bad_pwd_count(auth_context->sam_ctx,
500 msg, domain_dn);
501 if (!NT_STATUS_IS_OK(nt_status)) {
502 /*
503 * We need to return the original
504 * NT_STATUS_WRONG_PASSWORD error, so there isn't
505 * anything more we can do than write something into
506 * the log
507 */
508 DEBUG(0, ("Failed to note bad password for user [%s]: %s\n",
509 user_info->mapped.account_name,
510 nt_errstr(nt_status)));
511 }
512
513 if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
514 *authoritative = false;
515 }
516
517 TALLOC_FREE(tmp_ctx);
518 return NT_STATUS_WRONG_PASSWORD;
519 }
520
authsam_authenticate(struct auth4_context * auth_context,TALLOC_CTX * mem_ctx,struct ldb_context * sam_ctx,struct ldb_dn * domain_dn,struct ldb_message * msg,const struct auth_usersupplied_info * user_info,DATA_BLOB * user_sess_key,DATA_BLOB * lm_sess_key,bool * authoritative)521 static NTSTATUS authsam_authenticate(struct auth4_context *auth_context,
522 TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
523 struct ldb_dn *domain_dn,
524 struct ldb_message *msg,
525 const struct auth_usersupplied_info *user_info,
526 DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key,
527 bool *authoritative)
528 {
529 NTSTATUS nt_status;
530 bool interactive = (user_info->password_state == AUTH_PASSWORD_HASH);
531 uint32_t acct_flags = samdb_result_acct_flags(msg, NULL);
532 struct netr_SendToSamBase *send_to_sam = NULL;
533 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
534 if (!tmp_ctx) {
535 return NT_STATUS_NO_MEMORY;
536 }
537
538 /* You can only do an interactive login to normal accounts */
539 if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
540 if (!(acct_flags & ACB_NORMAL)) {
541 TALLOC_FREE(tmp_ctx);
542 return NT_STATUS_NO_SUCH_USER;
543 }
544 if (acct_flags & ACB_SMARTCARD_REQUIRED) {
545 if (acct_flags & ACB_DISABLED) {
546 DEBUG(2,("authsam_authenticate: Account for user '%s' "
547 "was disabled.\n",
548 user_info->mapped.account_name));
549 TALLOC_FREE(tmp_ctx);
550 return NT_STATUS_ACCOUNT_DISABLED;
551 }
552 DEBUG(2,("authsam_authenticate: Account for user '%s' "
553 "requires interactive smartcard logon.\n",
554 user_info->mapped.account_name));
555 TALLOC_FREE(tmp_ctx);
556 return NT_STATUS_SMARTCARD_LOGON_REQUIRED;
557 }
558 }
559
560 nt_status = authsam_password_check_and_record(auth_context, tmp_ctx,
561 domain_dn, msg, acct_flags,
562 user_info,
563 user_sess_key, lm_sess_key,
564 authoritative);
565 if (!NT_STATUS_IS_OK(nt_status)) {
566 TALLOC_FREE(tmp_ctx);
567 return nt_status;
568 }
569
570 nt_status = authsam_account_ok(tmp_ctx, auth_context->sam_ctx,
571 user_info->logon_parameters,
572 domain_dn,
573 msg,
574 user_info->workstation_name,
575 user_info->mapped.account_name,
576 false, false);
577 if (!NT_STATUS_IS_OK(nt_status)) {
578 TALLOC_FREE(tmp_ctx);
579 return nt_status;
580 }
581
582 nt_status = authsam_logon_success_accounting(auth_context->sam_ctx,
583 msg, domain_dn,
584 interactive,
585 &send_to_sam);
586
587 if (send_to_sam != NULL) {
588 auth_sam_trigger_zero_password(tmp_ctx,
589 auth_context->msg_ctx,
590 auth_context->event_ctx,
591 send_to_sam);
592 }
593
594 if (!NT_STATUS_IS_OK(nt_status)) {
595 TALLOC_FREE(tmp_ctx);
596 return nt_status;
597 }
598
599 if (user_sess_key && user_sess_key->data) {
600 talloc_steal(mem_ctx, user_sess_key->data);
601 }
602 if (lm_sess_key && lm_sess_key->data) {
603 talloc_steal(mem_ctx, lm_sess_key->data);
604 }
605
606 TALLOC_FREE(tmp_ctx);
607 return nt_status;
608 }
609
610
611
authsam_check_password_internals(struct auth_method_context * ctx,TALLOC_CTX * mem_ctx,const struct auth_usersupplied_info * user_info,struct auth_user_info_dc ** user_info_dc,bool * authoritative)612 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
613 TALLOC_CTX *mem_ctx,
614 const struct auth_usersupplied_info *user_info,
615 struct auth_user_info_dc **user_info_dc,
616 bool *authoritative)
617 {
618 NTSTATUS nt_status;
619 const char *account_name = user_info->mapped.account_name;
620 struct ldb_message *msg;
621 struct ldb_dn *domain_dn;
622 DATA_BLOB user_sess_key, lm_sess_key;
623 TALLOC_CTX *tmp_ctx;
624 const char *p = NULL;
625
626 if (ctx->auth_ctx->sam_ctx == NULL) {
627 DEBUG(0, ("No SAM available, cannot log in users\n"));
628 return NT_STATUS_INVALID_SYSTEM_SERVICE;
629 }
630
631 if (!account_name || !*account_name) {
632 /* 'not for me' */
633 return NT_STATUS_NOT_IMPLEMENTED;
634 }
635
636 tmp_ctx = talloc_new(mem_ctx);
637 if (!tmp_ctx) {
638 return NT_STATUS_NO_MEMORY;
639 }
640
641 domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
642 if (domain_dn == NULL) {
643 talloc_free(tmp_ctx);
644 return NT_STATUS_NO_SUCH_DOMAIN;
645 }
646
647 p = strchr_m(account_name, '@');
648 if (p != NULL) {
649 const char *nt4_domain = NULL;
650 const char *nt4_account = NULL;
651 bool is_my_domain = false;
652
653 nt_status = crack_name_to_nt4_name(mem_ctx,
654 ctx->auth_ctx->sam_ctx,
655 /*
656 * DRSUAPI_DS_NAME_FORMAT_UPN_FOR_LOGON ?
657 */
658 DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL,
659 account_name,
660 &nt4_domain, &nt4_account);
661 if (!NT_STATUS_IS_OK(nt_status)) {
662 talloc_free(tmp_ctx);
663 return NT_STATUS_NO_SUCH_USER;
664 }
665
666 is_my_domain = lpcfg_is_mydomain(ctx->auth_ctx->lp_ctx, nt4_domain);
667 if (!is_my_domain) {
668 /*
669 * This is a user within our forest,
670 * but in a different domain,
671 * we're not authoritative
672 */
673 talloc_free(tmp_ctx);
674 return NT_STATUS_NOT_IMPLEMENTED;
675 }
676
677 /*
678 * Let's use the NT4 account name for the lookup.
679 */
680 account_name = nt4_account;
681 }
682
683 nt_status = authsam_search_account(tmp_ctx, ctx->auth_ctx->sam_ctx, account_name, domain_dn, &msg);
684 if (!NT_STATUS_IS_OK(nt_status)) {
685 talloc_free(tmp_ctx);
686 return nt_status;
687 }
688
689 nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, ctx->auth_ctx->sam_ctx, domain_dn, msg, user_info,
690 &user_sess_key, &lm_sess_key, authoritative);
691 if (!NT_STATUS_IS_OK(nt_status)) {
692 talloc_free(tmp_ctx);
693 return nt_status;
694 }
695
696 nt_status = authsam_make_user_info_dc(tmp_ctx, ctx->auth_ctx->sam_ctx,
697 lpcfg_netbios_name(ctx->auth_ctx->lp_ctx),
698 lpcfg_sam_name(ctx->auth_ctx->lp_ctx),
699 lpcfg_sam_dnsname(ctx->auth_ctx->lp_ctx),
700 domain_dn,
701 msg,
702 user_sess_key, lm_sess_key,
703 user_info_dc);
704 if (!NT_STATUS_IS_OK(nt_status)) {
705 talloc_free(tmp_ctx);
706 return nt_status;
707 }
708
709 talloc_steal(mem_ctx, *user_info_dc);
710 talloc_free(tmp_ctx);
711
712 return NT_STATUS_OK;
713 }
714
authsam_ignoredomain_want_check(struct auth_method_context * ctx,TALLOC_CTX * mem_ctx,const struct auth_usersupplied_info * user_info)715 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
716 TALLOC_CTX *mem_ctx,
717 const struct auth_usersupplied_info *user_info)
718 {
719 if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
720 return NT_STATUS_NOT_IMPLEMENTED;
721 }
722
723 return NT_STATUS_OK;
724 }
725
726 /****************************************************************************
727 Check SAM security (above) but with a few extra checks.
728 ****************************************************************************/
authsam_want_check(struct auth_method_context * ctx,TALLOC_CTX * mem_ctx,const struct auth_usersupplied_info * user_info)729 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
730 TALLOC_CTX *mem_ctx,
731 const struct auth_usersupplied_info *user_info)
732 {
733 const char *effective_domain = user_info->mapped.domain_name;
734 bool is_local_name = false;
735 bool is_my_domain = false;
736 const char *p = NULL;
737 struct dsdb_trust_routing_table *trt = NULL;
738 const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
739 NTSTATUS status;
740
741 if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
742 return NT_STATUS_NOT_IMPLEMENTED;
743 }
744
745 if (effective_domain == NULL) {
746 effective_domain = "";
747 }
748
749 is_local_name = lpcfg_is_myname(ctx->auth_ctx->lp_ctx,
750 effective_domain);
751
752 /* check whether or not we service this domain/workgroup name */
753 switch (lpcfg_server_role(ctx->auth_ctx->lp_ctx)) {
754 case ROLE_STANDALONE:
755 return NT_STATUS_OK;
756
757 case ROLE_DOMAIN_MEMBER:
758 if (is_local_name) {
759 return NT_STATUS_OK;
760 }
761
762 DBG_DEBUG("%s is not one of my local names (DOMAIN_MEMBER)\n",
763 effective_domain);
764 return NT_STATUS_NOT_IMPLEMENTED;
765
766 case ROLE_ACTIVE_DIRECTORY_DC:
767 /* handled later */
768 break;
769
770 default:
771 DBG_ERR("lpcfg_server_role() has an undefined value\n");
772 return NT_STATUS_INVALID_SERVER_STATE;
773 }
774
775 /*
776 * Now we handle the AD DC case...
777 */
778
779 is_my_domain = lpcfg_is_my_domain_or_realm(ctx->auth_ctx->lp_ctx,
780 effective_domain);
781 if (is_my_domain) {
782 return NT_STATUS_OK;
783 }
784
785 if (user_info->mapped_state) {
786 /*
787 * The caller already did a cracknames call.
788 */
789 DBG_DEBUG("%s is not one domain name (DC)\n",
790 effective_domain);
791 return NT_STATUS_NOT_IMPLEMENTED;
792 }
793
794 if (!strequal(effective_domain, "")) {
795 DBG_DEBUG("%s is not one domain name (DC)\n",
796 effective_domain);
797 return NT_STATUS_NOT_IMPLEMENTED;
798 }
799
800 p = strchr_m(user_info->mapped.account_name, '@');
801 if (p == NULL) {
802 /*
803 * An empty to domain name should be handled
804 * as the local domain name.
805 */
806 return NT_STATUS_OK;
807 }
808
809 effective_domain = p + 1;
810 is_my_domain = lpcfg_is_my_domain_or_realm(ctx->auth_ctx->lp_ctx,
811 effective_domain);
812 if (is_my_domain) {
813 return NT_STATUS_OK;
814 }
815
816 if (strequal(effective_domain, "")) {
817 DBG_DEBUG("authsam_check_password: upn without realm (DC)\n");
818 return NT_STATUS_NOT_IMPLEMENTED;
819 }
820
821 /*
822 * as last option we check the routing table if the
823 * domain is within our forest.
824 */
825 status = dsdb_trust_routing_table_load(ctx->auth_ctx->sam_ctx,
826 mem_ctx, &trt);
827 if (!NT_STATUS_IS_OK(status)) {
828 DBG_ERR("authsam_check_password: dsdb_trust_routing_table_load() %s\n",
829 nt_errstr(status));
830 return status;
831 }
832
833 tdo = dsdb_trust_routing_by_name(trt, effective_domain);
834 if (tdo == NULL) {
835 DBG_DEBUG("%s is not a known TLN (DC)\n",
836 effective_domain);
837 TALLOC_FREE(trt);
838 return NT_STATUS_NOT_IMPLEMENTED;
839 }
840
841 if (!(tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST)) {
842 DBG_DEBUG("%s is not a TLN in our forest (DC)\n",
843 effective_domain);
844 TALLOC_FREE(trt);
845 return NT_STATUS_NOT_IMPLEMENTED;
846 }
847
848 /*
849 * This principal is within our forest.
850 * we'll later do a crack_name_to_nt4_name()
851 * to check if it's in our domain.
852 */
853 TALLOC_FREE(trt);
854 return NT_STATUS_OK;
855 }
856
857 /* Wrapper for the auth subsystem pointer */
authsam_get_user_info_dc_principal_wrapper(TALLOC_CTX * mem_ctx,struct auth4_context * auth_context,const char * principal,struct ldb_dn * user_dn,struct auth_user_info_dc ** user_info_dc)858 static NTSTATUS authsam_get_user_info_dc_principal_wrapper(TALLOC_CTX *mem_ctx,
859 struct auth4_context *auth_context,
860 const char *principal,
861 struct ldb_dn *user_dn,
862 struct auth_user_info_dc **user_info_dc)
863 {
864 return authsam_get_user_info_dc_principal(mem_ctx, auth_context->lp_ctx, auth_context->sam_ctx,
865 principal, user_dn, user_info_dc);
866 }
867 static const struct auth_operations sam_ignoredomain_ops = {
868 .name = "sam_ignoredomain",
869 .want_check = authsam_ignoredomain_want_check,
870 .check_password = authsam_check_password_internals,
871 .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper,
872 };
873
874 static const struct auth_operations sam_ops = {
875 .name = "sam",
876 .want_check = authsam_want_check,
877 .check_password = authsam_check_password_internals,
878 .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper,
879 };
880
881 _PUBLIC_ NTSTATUS auth4_sam_init(TALLOC_CTX *);
auth4_sam_init(TALLOC_CTX * ctx)882 _PUBLIC_ NTSTATUS auth4_sam_init(TALLOC_CTX *ctx)
883 {
884 NTSTATUS ret;
885
886 ret = auth_register(ctx, &sam_ops);
887 if (!NT_STATUS_IS_OK(ret)) {
888 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
889 return ret;
890 }
891
892 ret = auth_register(ctx, &sam_ignoredomain_ops);
893 if (!NT_STATUS_IS_OK(ret)) {
894 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
895 return ret;
896 }
897
898 return ret;
899 }
900