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s3: Fix wbinfo socket dir path.
[Samba/gebeck_regimport.git] / source3 / winbindd / winbindd_cred_cache.c
blob5e79a96ca7642a8824364bf8412a9ff8a6d2c209
1 /*
2 Unix SMB/CIFS implementation.
3
4 Winbind daemon - krb5 credential cache functions
5 and in-memory cache functions.
6
7 Copyright (C) Guenther Deschner 2005-2006
8 Copyright (C) Jeremy Allison 2006
9
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 3 of the License, or
13 (at your option) any later version.
14
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.
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "winbindd.h"
26 #include "../libcli/auth/libcli_auth.h"
27 #include "smb_krb5.h"
28 #include "libads/kerberos_proto.h"
29
30 #undef DBGC_CLASS
31 #define DBGC_CLASS DBGC_WINBIND
32
33 /* uncomment this to do fast debugging on the krb5 ticket renewal event */
34 #ifdef DEBUG_KRB5_TKT_RENEWAL
35 #undef DEBUG_KRB5_TKT_RENEWAL
36 #endif
37
38 #define MAX_CCACHES 100
39
40 static struct WINBINDD_CCACHE_ENTRY *ccache_list;
41 static void krb5_ticket_gain_handler(struct event_context *,
42 struct timed_event *,
43 struct timeval,
44 void *);
45 static void add_krb5_ticket_gain_handler_event(struct WINBINDD_CCACHE_ENTRY *,
46 struct timeval);
47
48 /* The Krb5 ticket refresh handler should be scheduled
49 at one-half of the period from now till the tkt
50 expiration */
51
52 static time_t krb5_event_refresh_time(time_t end_time)
53 {
54 time_t rest = end_time - time(NULL);
55 return end_time - rest/2;
56 }
57
58 /****************************************************************
59 Find an entry by name.
60 ****************************************************************/
61
62 static struct WINBINDD_CCACHE_ENTRY *get_ccache_by_username(const char *username)
63 {
64 struct WINBINDD_CCACHE_ENTRY *entry;
65
66 for (entry = ccache_list; entry; entry = entry->next) {
67 if (strequal(entry->username, username)) {
68 return entry;
69 }
70 }
71 return NULL;
72 }
73
74 /****************************************************************
75 How many do we have ?
76 ****************************************************************/
77
78 static int ccache_entry_count(void)
79 {
80 struct WINBINDD_CCACHE_ENTRY *entry;
81 int i = 0;
82
83 for (entry = ccache_list; entry; entry = entry->next) {
84 i++;
85 }
86 return i;
87 }
88
89 void ccache_remove_all_after_fork(void)
90 {
91 struct WINBINDD_CCACHE_ENTRY *cur, *next;
92
93 for (cur = ccache_list; cur; cur = next) {
94 next = cur->next;
95 DLIST_REMOVE(ccache_list, cur);
96 TALLOC_FREE(cur->event);
97 TALLOC_FREE(cur);
98 }
99
100 return;
101 }
102
103 /****************************************************************
104 Do the work of refreshing the ticket.
105 ****************************************************************/
106
107 static void krb5_ticket_refresh_handler(struct event_context *event_ctx,
108 struct timed_event *te,
109 struct timeval now,
110 void *private_data)
111 {
112 struct WINBINDD_CCACHE_ENTRY *entry =
113 talloc_get_type_abort(private_data, struct WINBINDD_CCACHE_ENTRY);
114 #ifdef HAVE_KRB5
115 int ret;
116 time_t new_start;
117 time_t expire_time = 0;
118 struct WINBINDD_MEMORY_CREDS *cred_ptr = entry->cred_ptr;
119 #endif
120
121 DEBUG(10,("krb5_ticket_refresh_handler called\n"));
122 DEBUGADD(10,("event called for: %s, %s\n",
123 entry->ccname, entry->username));
124
125 TALLOC_FREE(entry->event);
126
127 #ifdef HAVE_KRB5
128
129 /* Kinit again if we have the user password and we can't renew the old
130 * tgt anymore
131 * NB
132 * This happens when machine are put to sleep for a very long time. */
133
134 if (entry->renew_until < time(NULL)) {
135 rekinit:
136 if (cred_ptr && cred_ptr->pass) {
137
138 set_effective_uid(entry->uid);
139
140 ret = kerberos_kinit_password_ext(entry->principal_name,
141 cred_ptr->pass,
142 0, /* hm, can we do time correction here ? */
143 &entry->refresh_time,
144 &entry->renew_until,
145 entry->ccname,
146 False, /* no PAC required anymore */
147 True,
148 WINBINDD_PAM_AUTH_KRB5_RENEW_TIME,
149 NULL);
150 gain_root_privilege();
151
152 if (ret) {
153 DEBUG(3,("krb5_ticket_refresh_handler: "
154 "could not re-kinit: %s\n",
155 error_message(ret)));
156 /* destroy the ticket because we cannot rekinit
157 * it, ignore error here */
158 ads_kdestroy(entry->ccname);
159
160 /* Don't break the ticket refresh chain: retry
161 * refreshing ticket sometime later when KDC is
162 * unreachable -- BoYang. More error code handling
163 * here?
164 * */
165
166 if ((ret == KRB5_KDC_UNREACH)
167 || (ret == KRB5_REALM_CANT_RESOLVE)) {
168 #if defined(DEBUG_KRB5_TKT_RENEWAL)
169 new_start = time(NULL) + 30;
170 #else
171 new_start = time(NULL) +
172 MAX(30, lp_winbind_cache_time());
173 #endif
174 add_krb5_ticket_gain_handler_event(entry,
175 timeval_set(new_start, 0));
176 return;
177 }
178 TALLOC_FREE(entry->event);
179 return;
180 }
181
182 DEBUG(10,("krb5_ticket_refresh_handler: successful re-kinit "
183 "for: %s in ccache: %s\n",
184 entry->principal_name, entry->ccname));
185
186 #if defined(DEBUG_KRB5_TKT_RENEWAL)
187 new_start = time(NULL) + 30;
188 #else
189 /* The tkt should be refreshed at one-half the period
190 from now to the expiration time */
191 expire_time = entry->refresh_time;
192 new_start = krb5_event_refresh_time(entry->refresh_time);
193 #endif
194 goto done;
195 } else {
196 /* can this happen?
197 * No cached credentials
198 * destroy ticket and refresh chain
199 * */
200 ads_kdestroy(entry->ccname);
201 TALLOC_FREE(entry->event);
202 return;
203 }
204 }
205
206 set_effective_uid(entry->uid);
207
208 ret = smb_krb5_renew_ticket(entry->ccname,
209 entry->principal_name,
210 entry->service,
211 &new_start);
212 #if defined(DEBUG_KRB5_TKT_RENEWAL)
213 new_start = time(NULL) + 30;
214 #else
215 expire_time = new_start;
216 new_start = krb5_event_refresh_time(new_start);
217 #endif
218
219 gain_root_privilege();
220
221 if (ret) {
222 DEBUG(3,("krb5_ticket_refresh_handler: "
223 "could not renew tickets: %s\n",
224 error_message(ret)));
225 /* maybe we are beyond the renewing window */
226
227 /* evil rises here, we refresh ticket failed,
228 * but the ticket might be expired. Therefore,
229 * When we refresh ticket failed, destory the
230 * ticket */
231
232 ads_kdestroy(entry->ccname);
233
234 /* avoid breaking the renewal chain: retry in
235 * lp_winbind_cache_time() seconds when the KDC was not
236 * available right now.
237 * the return code can be KRB5_REALM_CANT_RESOLVE.
238 * More error code handling here? */
239
240 if ((ret == KRB5_KDC_UNREACH)
241 || (ret == KRB5_REALM_CANT_RESOLVE)) {
242 #if defined(DEBUG_KRB5_TKT_RENEWAL)
243 new_start = time(NULL) + 30;
244 #else
245 new_start = time(NULL) +
246 MAX(30, lp_winbind_cache_time());
247 #endif
248 /* ticket is destroyed here, we have to regain it
249 * if it is possible */
250 add_krb5_ticket_gain_handler_event(entry,
251 timeval_set(new_start, 0));
252 return;
253 }
254
255 /* This is evil, if the ticket was already expired.
256 * renew ticket function returns KRB5KRB_AP_ERR_TKT_EXPIRED.
257 * But there is still a chance that we can rekinit it.
258 *
259 * This happens when user login in online mode, and then network
260 * down or something cause winbind goes offline for a very long time,
261 * and then goes online again. ticket expired, renew failed.
262 * This happens when machine are put to sleep for a long time,
263 * but shorter than entry->renew_util.
264 * NB
265 * Looks like the KDC is reachable, we want to rekinit as soon as
266 * possible instead of waiting some time later. */
267 if ((ret == KRB5KRB_AP_ERR_TKT_EXPIRED)
268 || (ret == KRB5_FCC_NOFILE)) goto rekinit;
269
270 return;
271 }
272
273 done:
274 /* in cases that ticket will be unrenewable soon, we don't try to renew ticket
275 * but try to regain ticket if it is possible */
276 if (entry->renew_until && expire_time
277 && (entry->renew_until <= expire_time)) {
278 /* try to regain ticket 10 seconds before expiration */
279 expire_time -= 10;
280 add_krb5_ticket_gain_handler_event(entry,
281 timeval_set(expire_time, 0));
282 return;
283 }
284
285 if (entry->refresh_time == 0) {
286 entry->refresh_time = new_start;
287 }
288 entry->event = event_add_timed(winbind_event_context(), entry,
289 timeval_set(new_start, 0),
290 krb5_ticket_refresh_handler,
291 entry);
292
293 #endif
294 }
295
296 /****************************************************************
297 Do the work of regaining a ticket when coming from offline auth.
298 ****************************************************************/
299
300 static void krb5_ticket_gain_handler(struct event_context *event_ctx,
301 struct timed_event *te,
302 struct timeval now,
303 void *private_data)
304 {
305 struct WINBINDD_CCACHE_ENTRY *entry =
306 talloc_get_type_abort(private_data, struct WINBINDD_CCACHE_ENTRY);
307 #ifdef HAVE_KRB5
308 int ret;
309 struct timeval t;
310 struct WINBINDD_MEMORY_CREDS *cred_ptr = entry->cred_ptr;
311 struct winbindd_domain *domain = NULL;
312 #endif
313
314 DEBUG(10,("krb5_ticket_gain_handler called\n"));
315 DEBUGADD(10,("event called for: %s, %s\n",
316 entry->ccname, entry->username));
317
318 TALLOC_FREE(entry->event);
319
320 #ifdef HAVE_KRB5
321
322 if (!cred_ptr || !cred_ptr->pass) {
323 DEBUG(10,("krb5_ticket_gain_handler: no memory creds\n"));
324 return;
325 }
326
327 if ((domain = find_domain_from_name(entry->realm)) == NULL) {
328 DEBUG(0,("krb5_ticket_gain_handler: unknown domain\n"));
329 return;
330 }
331
332 if (!domain->online) {
333 goto retry_later;
334 }
335
336 set_effective_uid(entry->uid);
337
338 ret = kerberos_kinit_password_ext(entry->principal_name,
339 cred_ptr->pass,
340 0, /* hm, can we do time correction here ? */
341 &entry->refresh_time,
342 &entry->renew_until,
343 entry->ccname,
344 False, /* no PAC required anymore */
345 True,
346 WINBINDD_PAM_AUTH_KRB5_RENEW_TIME,
347 NULL);
348 gain_root_privilege();
349
350 if (ret) {
351 DEBUG(3,("krb5_ticket_gain_handler: "
352 "could not kinit: %s\n",
353 error_message(ret)));
354 /* evil. If we cannot do it, destroy any the __maybe__
355 * __existing__ ticket */
356 ads_kdestroy(entry->ccname);
357 goto retry_later;
358 }
359
360 DEBUG(10,("krb5_ticket_gain_handler: "
361 "successful kinit for: %s in ccache: %s\n",
362 entry->principal_name, entry->ccname));
363
364 goto got_ticket;
365
366 retry_later:
367
368 #if defined(DEBUG_KRB5_TKT_RENEWAL)
369 t = timeval_set(time(NULL) + 30, 0);
370 #else
371 t = timeval_current_ofs(MAX(30, lp_winbind_cache_time()), 0);
372 #endif
373
374 add_krb5_ticket_gain_handler_event(entry, t);
375 return;
376
377 got_ticket:
378
379 #if defined(DEBUG_KRB5_TKT_RENEWAL)
380 t = timeval_set(time(NULL) + 30, 0);
381 #else
382 t = timeval_set(krb5_event_refresh_time(entry->refresh_time), 0);
383 #endif
384
385 if (entry->refresh_time == 0) {
386 entry->refresh_time = t.tv_sec;
387 }
388 entry->event = event_add_timed(winbind_event_context(),
389 entry,
390 t,
391 krb5_ticket_refresh_handler,
392 entry);
393
394 return;
395 #endif
396 }
397
398 /**************************************************************
399 The gain initial ticket case is recognised as entry->refresh_time
400 is always zero.
401 **************************************************************/
402
403 static void add_krb5_ticket_gain_handler_event(struct WINBINDD_CCACHE_ENTRY *entry,
404 struct timeval t)
405 {
406 entry->refresh_time = 0;
407 entry->event = event_add_timed(winbind_event_context(),
408 entry,
409 t,
410 krb5_ticket_gain_handler,
411 entry);
412 }
413
414 void ccache_regain_all_now(void)
415 {
416 struct WINBINDD_CCACHE_ENTRY *cur;
417 struct timeval t = timeval_current();
418
419 for (cur = ccache_list; cur; cur = cur->next) {
420 struct timed_event *new_event;
421
422 /*
423 * if refresh_time is 0, we know that the
424 * the event has the krb5_ticket_gain_handler
425 */
426 if (cur->refresh_time == 0) {
427 new_event = event_add_timed(winbind_event_context(),
428 cur,
429 t,
430 krb5_ticket_gain_handler,
431 cur);
432 } else {
433 new_event = event_add_timed(winbind_event_context(),
434 cur,
435 t,
436 krb5_ticket_refresh_handler,
437 cur);
438 }
439
440 if (!new_event) {
441 continue;
442 }
443
444 TALLOC_FREE(cur->event);
445 cur->event = new_event;
446 }
447
448 return;
449 }
450
451 /****************************************************************
452 Check if an ccache entry exists.
453 ****************************************************************/
454
455 bool ccache_entry_exists(const char *username)
456 {
457 struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
458 return (entry != NULL);
459 }
460
461 /****************************************************************
462 Ensure we're changing the correct entry.
463 ****************************************************************/
464
465 bool ccache_entry_identical(const char *username,
466 uid_t uid,
467 const char *ccname)
468 {
469 struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
470
471 if (!entry) {
472 return False;
473 }
474
475 if (entry->uid != uid) {
476 DEBUG(0,("cache_entry_identical: uid's differ: %u != %u\n",
477 (unsigned int)entry->uid, (unsigned int)uid));
478 return False;
479 }
480 if (!strcsequal(entry->ccname, ccname)) {
481 DEBUG(0,("cache_entry_identical: "
482 "ccnames differ: (cache) %s != (client) %s\n",
483 entry->ccname, ccname));
484 return False;
485 }
486 return True;
487 }
488
489 NTSTATUS add_ccache_to_list(const char *princ_name,
490 const char *ccname,
491 const char *service,
492 const char *username,
493 const char *realm,
494 uid_t uid,
495 time_t create_time,
496 time_t ticket_end,
497 time_t renew_until,
498 bool postponed_request)
499 {
500 struct WINBINDD_CCACHE_ENTRY *entry = NULL;
501 struct timeval t;
502 NTSTATUS ntret;
503 #ifdef HAVE_KRB5
504 int ret;
505 #endif
506
507 if ((username == NULL && princ_name == NULL) ||
508 ccname == NULL || uid < 0) {
509 return NT_STATUS_INVALID_PARAMETER;
510 }
511
512 if (ccache_entry_count() + 1 > MAX_CCACHES) {
513 DEBUG(10,("add_ccache_to_list: "
514 "max number of ccaches reached\n"));
515 return NT_STATUS_NO_MORE_ENTRIES;
516 }
517
518 /* If it is cached login, destroy krb5 ticket
519 * to avoid surprise. */
520 #ifdef HAVE_KRB5
521 if (postponed_request) {
522 /* ignore KRB5_FCC_NOFILE error here */
523 ret = ads_kdestroy(ccname);
524 if (ret == KRB5_FCC_NOFILE) {
525 ret = 0;
526 }
527 if (ret) {
528 DEBUG(0, ("add_ccache_to_list: failed to destroy "
529 "user krb5 ccache %s with %s\n", ccname,
530 error_message(ret)));
531 return krb5_to_nt_status(ret);
532 }
533 DEBUG(10, ("add_ccache_to_list: successfully destroyed "
534 "krb5 ccache %s for user %s\n", ccname,
535 username));
536 }
537 #endif
538
539 /* Reference count old entries */
540 entry = get_ccache_by_username(username);
541 if (entry) {
542 /* Check cached entries are identical. */
543 if (!ccache_entry_identical(username, uid, ccname)) {
544 return NT_STATUS_INVALID_PARAMETER;
545 }
546 entry->ref_count++;
547 DEBUG(10,("add_ccache_to_list: "
548 "ref count on entry %s is now %d\n",
549 username, entry->ref_count));
550 /* FIXME: in this case we still might want to have a krb5 cred
551 * event handler created - gd
552 * Add ticket refresh handler here */
553
554 if (!lp_winbind_refresh_tickets() || renew_until <= 0) {
555 return NT_STATUS_OK;
556 }
557
558 if (!entry->event) {
559 if (postponed_request) {
560 t = timeval_current_ofs(MAX(30, lp_winbind_cache_time()), 0);
561 add_krb5_ticket_gain_handler_event(entry, t);
562 } else {
563 /* Renew at 1/2 the ticket expiration time */
564 #if defined(DEBUG_KRB5_TKT_RENEWAL)
565 t = timeval_set(time(NULL)+30, 0);
566 #else
567 t = timeval_set(krb5_event_refresh_time(ticket_end),
568 0);
569 #endif
570 if (!entry->refresh_time) {
571 entry->refresh_time = t.tv_sec;
572 }
573 entry->event = event_add_timed(winbind_event_context(),
574 entry,
575 t,
576 krb5_ticket_refresh_handler,
577 entry);
578 }
579
580 if (!entry->event) {
581 ntret = remove_ccache(username);
582 if (!NT_STATUS_IS_OK(ntret)) {
583 DEBUG(0, ("add_ccache_to_list: Failed to remove krb5 "
584 "ccache %s for user %s\n", entry->ccname,
585 entry->username));
586 DEBUG(0, ("add_ccache_to_list: error is %s\n",
587 nt_errstr(ntret)));
588 return ntret;
589 }
590 return NT_STATUS_NO_MEMORY;
591 }
592
593 DEBUG(10,("add_ccache_to_list: added krb5_ticket handler\n"));
594 }
595
596 return NT_STATUS_OK;
597 }
598
599 entry = talloc(NULL, struct WINBINDD_CCACHE_ENTRY);
600 if (!entry) {
601 return NT_STATUS_NO_MEMORY;
602 }
603
604 ZERO_STRUCTP(entry);
605
606 if (username) {
607 entry->username = talloc_strdup(entry, username);
608 if (!entry->username) {
609 goto no_mem;
610 }
611 }
612 if (princ_name) {
613 entry->principal_name = talloc_strdup(entry, princ_name);
614 if (!entry->principal_name) {
615 goto no_mem;
616 }
617 }
618 if (service) {
619 entry->service = talloc_strdup(entry, service);
620 if (!entry->service) {
621 goto no_mem;
622 }
623 }
624
625 entry->ccname = talloc_strdup(entry, ccname);
626 if (!entry->ccname) {
627 goto no_mem;
628 }
629
630 entry->realm = talloc_strdup(entry, realm);
631 if (!entry->realm) {
632 goto no_mem;
633 }
634
635 entry->create_time = create_time;
636 entry->renew_until = renew_until;
637 entry->uid = uid;
638 entry->ref_count = 1;
639
640 if (!lp_winbind_refresh_tickets() || renew_until <= 0) {
641 goto add_entry;
642 }
643
644 if (postponed_request) {
645 t = timeval_current_ofs(MAX(30, lp_winbind_cache_time()), 0);
646 add_krb5_ticket_gain_handler_event(entry, t);
647 } else {
648 /* Renew at 1/2 the ticket expiration time */
649 #if defined(DEBUG_KRB5_TKT_RENEWAL)
650 t = timeval_set(time(NULL)+30, 0);
651 #else
652 t = timeval_set(krb5_event_refresh_time(ticket_end), 0);
653 #endif
654 if (entry->refresh_time == 0) {
655 entry->refresh_time = t.tv_sec;
656 }
657 entry->event = event_add_timed(winbind_event_context(),
658 entry,
659 t,
660 krb5_ticket_refresh_handler,
661 entry);
662 }
663
664 if (!entry->event) {
665 goto no_mem;
666 }
667
668 DEBUG(10,("add_ccache_to_list: added krb5_ticket handler\n"));
669
670 add_entry:
671
672 DLIST_ADD(ccache_list, entry);
673
674 DEBUG(10,("add_ccache_to_list: "
675 "added ccache [%s] for user [%s] to the list\n",
676 ccname, username));
677
678 return NT_STATUS_OK;
679
680 no_mem:
681
682 TALLOC_FREE(entry);
683 return NT_STATUS_NO_MEMORY;
684 }
685
686 /*******************************************************************
687 Remove a WINBINDD_CCACHE_ENTRY entry and the krb5 ccache if no longer
688 referenced.
689 *******************************************************************/
690
691 NTSTATUS remove_ccache(const char *username)
692 {
693 struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
694 NTSTATUS status = NT_STATUS_OK;
695 #ifdef HAVE_KRB5
696 krb5_error_code ret;
697 #endif
698
699 if (!entry) {
700 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
701 }
702
703 if (entry->ref_count <= 0) {
704 DEBUG(0,("remove_ccache: logic error. "
705 "ref count for user %s = %d\n",
706 username, entry->ref_count));
707 return NT_STATUS_INTERNAL_DB_CORRUPTION;
708 }
709
710 entry->ref_count--;
711
712 if (entry->ref_count > 0) {
713 DEBUG(10,("remove_ccache: entry %s ref count now %d\n",
714 username, entry->ref_count));
715 return NT_STATUS_OK;
716 }
717
718 /* no references any more */
719
720 DLIST_REMOVE(ccache_list, entry);
721 TALLOC_FREE(entry->event); /* unregisters events */
722
723 #ifdef HAVE_KRB5
724 ret = ads_kdestroy(entry->ccname);
725
726 /* we ignore the error when there has been no credential cache */
727 if (ret == KRB5_FCC_NOFILE) {
728 ret = 0;
729 } else if (ret) {
730 DEBUG(0,("remove_ccache: "
731 "failed to destroy user krb5 ccache %s with: %s\n",
732 entry->ccname, error_message(ret)));
733 } else {
734 DEBUG(10,("remove_ccache: "
735 "successfully destroyed krb5 ccache %s for user %s\n",
736 entry->ccname, username));
737 }
738 status = krb5_to_nt_status(ret);
739 #endif
740
741 TALLOC_FREE(entry);
742 DEBUG(10,("remove_ccache: removed ccache for user %s\n", username));
743
744 return status;
745 }
746
747 /*******************************************************************
748 In memory credentials cache code.
749 *******************************************************************/
750
751 static struct WINBINDD_MEMORY_CREDS *memory_creds_list;
752
753 /***********************************************************
754 Find an entry on the list by name.
755 ***********************************************************/
756
757 struct WINBINDD_MEMORY_CREDS *find_memory_creds_by_name(const char *username)
758 {
759 struct WINBINDD_MEMORY_CREDS *p;
760
761 for (p = memory_creds_list; p; p = p->next) {
762 if (strequal(p->username, username)) {
763 return p;
764 }
765 }
766 return NULL;
767 }
768
769 /***********************************************************
770 Store the required creds and mlock them.
771 ***********************************************************/
772
773 static NTSTATUS store_memory_creds(struct WINBINDD_MEMORY_CREDS *memcredp,
774 const char *pass)
775 {
776 #if !defined(HAVE_MLOCK)
777 return NT_STATUS_OK;
778 #else
779 /* new_entry->nt_hash is the base pointer for the block
780 of memory pointed into by new_entry->lm_hash and
781 new_entry->pass (if we're storing plaintext). */
782
783 memcredp->len = NT_HASH_LEN + LM_HASH_LEN;
784 if (pass) {
785 memcredp->len += strlen(pass)+1;
786 }
787
788
789 #if defined(LINUX)
790 /* aligning the memory on on x86_64 and compiling
791 with gcc 4.1 using -O2 causes a segv in the
792 next memset() --jerry */
793 memcredp->nt_hash = SMB_MALLOC_ARRAY(unsigned char, memcredp->len);
794 #else
795 /* On non-linux platforms, mlock()'d memory must be aligned */
796 memcredp->nt_hash = SMB_MEMALIGN_ARRAY(unsigned char,
797 getpagesize(), memcredp->len);
798 #endif
799 if (!memcredp->nt_hash) {
800 return NT_STATUS_NO_MEMORY;
801 }
802 memset(memcredp->nt_hash, 0x0, memcredp->len);
803
804 memcredp->lm_hash = memcredp->nt_hash + NT_HASH_LEN;
805
806 #ifdef DEBUG_PASSWORD
807 DEBUG(10,("mlocking memory: %p\n", memcredp->nt_hash));
808 #endif
809 if ((mlock(memcredp->nt_hash, memcredp->len)) == -1) {
810 DEBUG(0,("failed to mlock memory: %s (%d)\n",
811 strerror(errno), errno));
812 SAFE_FREE(memcredp->nt_hash);
813 return map_nt_error_from_unix(errno);
814 }
815
816 #ifdef DEBUG_PASSWORD
817 DEBUG(10,("mlocked memory: %p\n", memcredp->nt_hash));
818 #endif
819
820 /* Create and store the password hashes. */
821 E_md4hash(pass, memcredp->nt_hash);
822 E_deshash(pass, memcredp->lm_hash);
823
824 if (pass) {
825 memcredp->pass = (char *)memcredp->lm_hash + LM_HASH_LEN;
826 memcpy(memcredp->pass, pass,
827 memcredp->len - NT_HASH_LEN - LM_HASH_LEN);
828 }
829
830 return NT_STATUS_OK;
831 #endif
832 }
833
834 /***********************************************************
835 Destroy existing creds.
836 ***********************************************************/
837
838 static NTSTATUS delete_memory_creds(struct WINBINDD_MEMORY_CREDS *memcredp)
839 {
840 #if !defined(HAVE_MUNLOCK)
841 return NT_STATUS_OK;
842 #else
843 if (munlock(memcredp->nt_hash, memcredp->len) == -1) {
844 DEBUG(0,("failed to munlock memory: %s (%d)\n",
845 strerror(errno), errno));
846 return map_nt_error_from_unix(errno);
847 }
848 memset(memcredp->nt_hash, '\0', memcredp->len);
849 SAFE_FREE(memcredp->nt_hash);
850 memcredp->nt_hash = NULL;
851 memcredp->lm_hash = NULL;
852 memcredp->pass = NULL;
853 memcredp->len = 0;
854 return NT_STATUS_OK;
855 #endif
856 }
857
858 /***********************************************************
859 Replace the required creds with new ones (password change).
860 ***********************************************************/
861
862 static NTSTATUS winbindd_replace_memory_creds_internal(struct WINBINDD_MEMORY_CREDS *memcredp,
863 const char *pass)
864 {
865 NTSTATUS status = delete_memory_creds(memcredp);
866 if (!NT_STATUS_IS_OK(status)) {
867 return status;
868 }
869 return store_memory_creds(memcredp, pass);
870 }
871
872 /*************************************************************
873 Store credentials in memory in a list.
874 *************************************************************/
875
876 static NTSTATUS winbindd_add_memory_creds_internal(const char *username,
877 uid_t uid,
878 const char *pass)
879 {
880 /* Shortcut to ensure we don't store if no mlock. */
881 #if !defined(HAVE_MLOCK) || !defined(HAVE_MUNLOCK)
882 return NT_STATUS_OK;
883 #else
884 NTSTATUS status;
885 struct WINBINDD_MEMORY_CREDS *memcredp = NULL;
886
887 memcredp = find_memory_creds_by_name(username);
888 if (uid == (uid_t)-1) {
889 DEBUG(0,("winbindd_add_memory_creds_internal: "
890 "invalid uid for user %s.\n", username));
891 return NT_STATUS_INVALID_PARAMETER;
892 }
893
894 if (memcredp) {
895 /* Already exists. Increment the reference count and replace stored creds. */
896 if (uid != memcredp->uid) {
897 DEBUG(0,("winbindd_add_memory_creds_internal: "
898 "uid %u for user %s doesn't "
899 "match stored uid %u. Replacing.\n",
900 (unsigned int)uid, username,
901 (unsigned int)memcredp->uid));
902 memcredp->uid = uid;
903 }
904 memcredp->ref_count++;
905 DEBUG(10,("winbindd_add_memory_creds_internal: "
906 "ref count for user %s is now %d\n",
907 username, memcredp->ref_count));
908 return winbindd_replace_memory_creds_internal(memcredp, pass);
909 }
910
911 memcredp = talloc_zero(NULL, struct WINBINDD_MEMORY_CREDS);
912 if (!memcredp) {
913 return NT_STATUS_NO_MEMORY;
914 }
915 memcredp->username = talloc_strdup(memcredp, username);
916 if (!memcredp->username) {
917 talloc_destroy(memcredp);
918 return NT_STATUS_NO_MEMORY;
919 }
920
921 status = store_memory_creds(memcredp, pass);
922 if (!NT_STATUS_IS_OK(status)) {
923 talloc_destroy(memcredp);
924 return status;
925 }
926
927 memcredp->uid = uid;
928 memcredp->ref_count = 1;
929 DLIST_ADD(memory_creds_list, memcredp);
930
931 DEBUG(10,("winbindd_add_memory_creds_internal: "
932 "added entry for user %s\n", username));
933
934 return NT_STATUS_OK;
935 #endif
936 }
937
938 /*************************************************************
939 Store users credentials in memory. If we also have a
940 struct WINBINDD_CCACHE_ENTRY for this username with a
941 refresh timer, then store the plaintext of the password
942 and associate the new credentials with the struct WINBINDD_CCACHE_ENTRY.
943 *************************************************************/
944
945 NTSTATUS winbindd_add_memory_creds(const char *username,
946 uid_t uid,
947 const char *pass)
948 {
949 struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
950 NTSTATUS status;
951
952 status = winbindd_add_memory_creds_internal(username, uid, pass);
953 if (!NT_STATUS_IS_OK(status)) {
954 return status;
955 }
956
957 if (entry) {
958 struct WINBINDD_MEMORY_CREDS *memcredp = NULL;
959 memcredp = find_memory_creds_by_name(username);
960 if (memcredp) {
961 entry->cred_ptr = memcredp;
962 }
963 }
964
965 return status;
966 }
967
968 /*************************************************************
969 Decrement the in-memory ref count - delete if zero.
970 *************************************************************/
971
972 NTSTATUS winbindd_delete_memory_creds(const char *username)
973 {
974 struct WINBINDD_MEMORY_CREDS *memcredp = NULL;
975 struct WINBINDD_CCACHE_ENTRY *entry = NULL;
976 NTSTATUS status = NT_STATUS_OK;
977
978 memcredp = find_memory_creds_by_name(username);
979 entry = get_ccache_by_username(username);
980
981 if (!memcredp) {
982 DEBUG(10,("winbindd_delete_memory_creds: unknown user %s\n",
983 username));
984 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
985 }
986
987 if (memcredp->ref_count <= 0) {
988 DEBUG(0,("winbindd_delete_memory_creds: logic error. "
989 "ref count for user %s = %d\n",
990 username, memcredp->ref_count));
991 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
992 }
993
994 memcredp->ref_count--;
995 if (memcredp->ref_count <= 0) {
996 delete_memory_creds(memcredp);
997 DLIST_REMOVE(memory_creds_list, memcredp);
998 talloc_destroy(memcredp);
999 DEBUG(10,("winbindd_delete_memory_creds: "
1000 "deleted entry for user %s\n",
1001 username));
1002 } else {
1003 DEBUG(10,("winbindd_delete_memory_creds: "
1004 "entry for user %s ref_count now %d\n",
1005 username, memcredp->ref_count));
1006 }
1007
1008 if (entry) {
1009 /* Ensure we have no dangling references to this. */
1010 entry->cred_ptr = NULL;
1011 }
1012
1013 return status;
1014 }
1015
1016 /***********************************************************
1017 Replace the required creds with new ones (password change).
1018 ***********************************************************/
1019
1020 NTSTATUS winbindd_replace_memory_creds(const char *username,
1021 const char *pass)
1022 {
1023 struct WINBINDD_MEMORY_CREDS *memcredp = NULL;
1024
1025 memcredp = find_memory_creds_by_name(username);
1026 if (!memcredp) {
1027 DEBUG(10,("winbindd_replace_memory_creds: unknown user %s\n",
1028 username));
1029 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
1030 }
1031
1032 DEBUG(10,("winbindd_replace_memory_creds: replaced creds for user %s\n",
1033 username));
1034
1035 return winbindd_replace_memory_creds_internal(memcredp, pass);
1036 }
reg import