source/nsswitch/winbindd_cred_cache.c

   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 2 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, write to the Free Software
  22    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_WINBIND
  29
  30 /* uncomment this to to fast debugging on the krb5 ticket renewal event */
  31 #ifdef DEBUG_KRB5_TKT_RENEWAL
  32 #undef DEBUG_KRB5_TKT_RENEWAL
  33 #endif
  34
  35 #define MAX_CCACHES 100
  36
  37 static struct WINBINDD_CCACHE_ENTRY *ccache_list;
  38
  39 /* The Krb5 ticket refresh handler should be scheduled
  40    at one-half of the period from now till the tkt
  41    expiration */
  42 #define KRB5_EVENT_REFRESH_TIME(x) ((x) - (((x) - time(NULL))/2))
  43
  44 /****************************************************************
  45  Find an entry by name.
  46 ****************************************************************/
  47
  48 static struct WINBINDD_CCACHE_ENTRY *get_ccache_by_username(const char *username)
  49 {
  50         struct WINBINDD_CCACHE_ENTRY *entry;
  51
  52         for (entry = ccache_list; entry; entry = entry->next) {
  53                 if (strequal(entry->username, username)) {
  54                         return entry;
  55                 }
  56         }
  57         return NULL;
  58 }
  59
  60 /****************************************************************
  61  How many do we have ?
  62 ****************************************************************/
  63
  64 static int ccache_entry_count(void)
  65 {
  66         struct WINBINDD_CCACHE_ENTRY *entry;
  67         int i = 0;
  68
  69         for (entry = ccache_list; entry; entry = entry->next) {
  70                 i++;
  71         }
  72         return i;
  73 }
  74
  75 /****************************************************************
  76  Do the work of refreshing the ticket.
  77 ****************************************************************/
  78
  79 static void krb5_ticket_refresh_handler(struct event_context *event_ctx,
  80                                         struct timed_event *te,
  81                                         const struct timeval *now,
  82                                         void *private_data)
  83 {
  84         struct WINBINDD_CCACHE_ENTRY *entry =
  85                 talloc_get_type_abort(private_data, struct WINBINDD_CCACHE_ENTRY);
  86 #ifdef HAVE_KRB5
  87         int ret;
  88         time_t new_start;
  89         struct WINBINDD_MEMORY_CREDS *cred_ptr = entry->cred_ptr;
  90 #endif
  91
  92         DEBUG(10,("krb5_ticket_refresh_handler called\n"));
  93         DEBUGADD(10,("event called for: %s, %s\n", entry->ccname, entry->username));
  94
  95         TALLOC_FREE(entry->event);
  96
  97 #ifdef HAVE_KRB5
  98
  99         /* Kinit again if we have the user password and we can't renew the old
 100          * tgt anymore */
 101
 102         if ((entry->renew_until < time(NULL)) && cred_ptr && cred_ptr->pass) {
 103
 104                 set_effective_uid(entry->uid);
 105
 106                 ret = kerberos_kinit_password_ext(entry->principal_name,
 107                                                   cred_ptr->pass,
 108                                                   0, /* hm, can we do time correction here ? */
 109                                                   &entry->refresh_time,
 110                                                   &entry->renew_until,
 111                                                   entry->ccname,
 112                                                   False, /* no PAC required anymore */
 113                                                   True,
 114                                                   WINBINDD_PAM_AUTH_KRB5_RENEW_TIME);
 115                 gain_root_privilege();
 116
 117                 if (ret) {
 118                         DEBUG(3,("krb5_ticket_refresh_handler: could not re-kinit: %s\n",
 119                                 error_message(ret)));
 120                         TALLOC_FREE(entry->event);
 121                         return;
 122                 }
 123
 124                 DEBUG(10,("krb5_ticket_refresh_handler: successful re-kinit "
 125                         "for: %s in ccache: %s\n",
 126                         entry->principal_name, entry->ccname));
 127
 128 #if defined(DEBUG_KRB5_TKT_RENEWAL)
 129                 new_start = time(NULL) + 30;
 130 #else
 131                 /* The tkt should be refreshed at one-half the period
 132                    from now to the expiration time */
 133                 new_start = KRB5_EVENT_REFRESH_TIME(entry->refresh_time);
 134 #endif
 135
 136                 goto done;
 137         }
 138
 139         set_effective_uid(entry->uid);
 140
 141         ret = smb_krb5_renew_ticket(entry->ccname,
 142                                     entry->principal_name,
 143                                     entry->service,
 144                                     &new_start);
 145 #if defined(DEBUG_KRB5_TKT_RENEWAL)
 146         new_start = time(NULL) + 30;
 147 #else
 148         new_start = KRB5_EVENT_REFRESH_TIME(new_start);
 149 #endif
 150
 151         gain_root_privilege();
 152
 153         if (ret) {
 154                 DEBUG(3,("krb5_ticket_refresh_handler: could not renew tickets: %s\n",
 155                         error_message(ret)));
 156                 /* maybe we are beyond the renewing window */
 157
 158                 /* avoid breaking the renewal chain: retry in lp_winbind_cache_time()
 159                  * seconds when the KDC was not available right now. */
 160
 161                 if (ret == KRB5_KDC_UNREACH) {
 162                         new_start = time(NULL) + MAX(30, lp_winbind_cache_time());
 163                         goto done;
 164                 }
 165
 166                 return;
 167         }
 168
 169 done:
 170
 171         entry->event = event_add_timed(winbind_event_context(), entry,
 172                                        timeval_set(new_start, 0),
 173                                        "krb5_ticket_refresh_handler",
 174                                        krb5_ticket_refresh_handler,
 175                                        entry);
 176
 177 #endif
 178 }
 179
 180 /****************************************************************
 181  Do the work of regaining a ticket when coming from offline auth.
 182 ****************************************************************/
 183
 184 static void krb5_ticket_gain_handler(struct event_context *event_ctx,
 185                                      struct timed_event *te,
 186                                         const struct timeval *now,
 187                                         void *private_data)
 188 {
 189         struct WINBINDD_CCACHE_ENTRY *entry =
 190                 talloc_get_type_abort(private_data, struct WINBINDD_CCACHE_ENTRY);
 191 #ifdef HAVE_KRB5
 192         int ret;
 193         struct timeval t;
 194         struct WINBINDD_MEMORY_CREDS *cred_ptr = entry->cred_ptr;
 195         struct winbindd_domain *domain = NULL;
 196 #endif
 197
 198         DEBUG(10,("krb5_ticket_gain_handler called\n"));
 199         DEBUGADD(10,("event called for: %s, %s\n", entry->ccname, entry->username));
 200
 201         TALLOC_FREE(entry->event);
 202
 203 #ifdef HAVE_KRB5
 204
 205         if (!cred_ptr || !cred_ptr->pass) {
 206                 DEBUG(10,("krb5_ticket_gain_handler: no memory creds\n"));
 207                 return;
 208         }
 209
 210         if ((domain = find_domain_from_name(entry->realm)) == NULL) {
 211                 DEBUG(0,("krb5_ticket_gain_handler: unknown domain\n"));
 212                 return;
 213         }
 214
 215         if (domain->online) {
 216
 217                 set_effective_uid(entry->uid);
 218
 219                 ret = kerberos_kinit_password_ext(entry->principal_name,
 220                                                 cred_ptr->pass,
 221                                                 0, /* hm, can we do time correction here ? */
 222                                                 &entry->refresh_time,
 223                                                 &entry->renew_until,
 224                                                 entry->ccname,
 225                                                 False, /* no PAC required anymore */
 226                                                 True,
 227                                                 WINBINDD_PAM_AUTH_KRB5_RENEW_TIME);
 228                 gain_root_privilege();
 229
 230                 if (ret) {
 231                         DEBUG(3,("krb5_ticket_gain_handler: could not kinit: %s\n",
 232                                 error_message(ret)));
 233                         goto retry_later;
 234                 }
 235
 236                 DEBUG(10,("krb5_ticket_gain_handler: successful kinit for: %s in ccache: %s\n",
 237                         entry->principal_name, entry->ccname));
 238
 239                 goto got_ticket;
 240         }
 241
 242   retry_later:
 243
 244         entry->event = event_add_timed(winbind_event_context(), entry,
 245                                         timeval_current_ofs(MAX(30, lp_winbind_cache_time()), 0),
 246                                         "krb5_ticket_gain_handler",
 247                                         krb5_ticket_gain_handler,
 248                                         entry);
 249
 250         return;
 251
 252   got_ticket:
 253
 254 #if defined(DEBUG_KRB5_TKT_RENEWAL)
 255         t = timeval_set(time(NULL) + 30, 0);
 256 #else
 257         t = timeval_set(KRB5_EVENT_REFRESH_TIME(entry->refresh_time), 0);
 258 #endif
 259
 260         entry->event = event_add_timed(winbind_event_context(), entry,
 261                                         t,
 262                                         "krb5_ticket_refresh_handler",
 263                                         krb5_ticket_refresh_handler,
 264                                         entry);
 265
 266         return;
 267 #endif
 268 }
 269
 270 /****************************************************************
 271  Check if an ccache entry exists.
 272 ****************************************************************/
 273
 274 BOOL ccache_entry_exists(const char *username)
 275 {
 276         struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
 277         return (entry != NULL);
 278 }
 279
 280 /****************************************************************
 281  Ensure we're changing the correct entry.
 282 ****************************************************************/
 283
 284 BOOL ccache_entry_identical(const char *username, uid_t uid, const char *ccname)
 285 {
 286         struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
 287
 288         if (!entry) {
 289                 return False;
 290         }
 291
 292         if (entry->uid != uid) {
 293                 DEBUG(0,("cache_entry_identical: uid's differ: %u != %u\n",
 294                         (unsigned int)entry->uid, (unsigned int)uid ));
 295                 return False;
 296         }
 297         if (!strcsequal(entry->ccname, ccname)) {
 298                 DEBUG(0,("cache_entry_identical: ccnames differ: (cache) %s != (client) %s\n",
 299                         entry->ccname, ccname));
 300                 return False;
 301         }
 302         return True;
 303 }
 304
 305 NTSTATUS add_ccache_to_list(const char *princ_name,
 306                             const char *ccname,
 307                             const char *service,
 308                             const char *username,
 309                             const char *realm,
 310                             uid_t uid,
 311                             time_t create_time,
 312                             time_t ticket_end,
 313                             time_t renew_until,
 314                             BOOL postponed_request)
 315 {
 316         struct WINBINDD_CCACHE_ENTRY *entry = NULL;
 317
 318         if ((username == NULL && princ_name == NULL) || ccname == NULL || uid < 0) {
 319                 return NT_STATUS_INVALID_PARAMETER;
 320         }
 321
 322         if (ccache_entry_count() + 1 > MAX_CCACHES) {
 323                 DEBUG(10,("add_ccache_to_list: max number of ccaches reached\n"));
 324                 return NT_STATUS_NO_MORE_ENTRIES;
 325         }
 326
 327         /* Reference count old entries */
 328         entry = get_ccache_by_username(username);
 329         if (entry) {
 330                 /* Check cached entries are identical. */
 331                 if (!ccache_entry_identical(username, uid, ccname)) {
 332                         return NT_STATUS_INVALID_PARAMETER;
 333                 }
 334                 entry->ref_count++;
 335                 DEBUG(10,("add_ccache_to_list: ref count on entry %s is now %d\n",
 336                         username, entry->ref_count));
 337                 /* FIXME: in this case we still might want to have a krb5 cred
 338                  * event handler created - gd*/
 339                 return NT_STATUS_OK;
 340         }
 341
 342         entry = TALLOC_P(NULL, struct WINBINDD_CCACHE_ENTRY);
 343         if (!entry) {
 344                 return NT_STATUS_NO_MEMORY;
 345         }
 346
 347         ZERO_STRUCTP(entry);
 348
 349         if (username) {
 350                 entry->username = talloc_strdup(entry, username);
 351                 if (!entry->username) {
 352                         goto no_mem;
 353                 }
 354         }
 355         if (princ_name) {
 356                 entry->principal_name = talloc_strdup(entry, princ_name);
 357                 if (!entry->principal_name) {
 358                         goto no_mem;
 359                 }
 360         }
 361         if (service) {
 362                 entry->service = talloc_strdup(entry, service);
 363                 if (!entry->service) {
 364                         goto no_mem;
 365                 }
 366         }
 367
 368         entry->ccname = talloc_strdup(entry, ccname);
 369         if (!entry->ccname) {
 370                 goto no_mem;
 371         }
 372
 373         entry->realm = talloc_strdup(entry, realm);
 374         if (!entry->realm) {
 375                 goto no_mem;
 376         }
 377
 378         entry->create_time = create_time;
 379         entry->renew_until = renew_until;
 380         entry->uid = uid;
 381         entry->ref_count = 1;
 382
 383         if (lp_winbind_refresh_tickets() && renew_until > 0) {
 384                 if (postponed_request) {
 385                         entry->event = event_add_timed(winbind_event_context(), entry,
 386                                                 timeval_current_ofs(MAX(30, lp_winbind_cache_time()), 0),
 387                                                 "krb5_ticket_gain_handler",
 388                                                 krb5_ticket_gain_handler,
 389                                                 entry);
 390                 } else {
 391                         /* Renew at 1/2 the ticket expiration time */
 392                         entry->event = event_add_timed(winbind_event_context(), entry,
 393 #if defined(DEBUG_KRB5_TKT_RENEWAL)
 394                                                 timeval_set(time(NULL)+30, 0),
 395 #else
 396                                                 timeval_set(KRB5_EVENT_REFRESH_TIME(ticket_end), 0),
 397 #endif
 398                                                 "krb5_ticket_refresh_handler",
 399                                                 krb5_ticket_refresh_handler,
 400                                                 entry);
 401                 }
 402
 403                 if (!entry->event) {
 404                         goto no_mem;
 405                 }
 406
 407                 DEBUG(10,("add_ccache_to_list: added krb5_ticket handler\n"));
 408         }
 409
 410         DLIST_ADD(ccache_list, entry);
 411
 412         DEBUG(10,("add_ccache_to_list: added ccache [%s] for user [%s] to the list\n", ccname, username));
 413
 414         return NT_STATUS_OK;
 415
 416  no_mem:
 417
 418         TALLOC_FREE(entry);
 419         return NT_STATUS_NO_MEMORY;
 420 }
 421
 422 /*******************************************************************
 423  Remove a WINBINDD_CCACHE_ENTRY entry and the krb5 ccache if no longer referenced.
 424 *******************************************************************/
 425
 426 NTSTATUS remove_ccache(const char *username)
 427 {
 428         struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
 429         NTSTATUS status = NT_STATUS_OK;
 430 #ifdef HAVE_KRB5
 431         krb5_error_code ret;
 432 #endif
 433
 434         if (!entry) {
 435                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 436         }
 437
 438         if (entry->ref_count <= 0) {
 439                 DEBUG(0,("remove_ccache: logic error. ref count for user %s = %d\n",
 440                         username, entry->ref_count));
 441                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 442         }
 443
 444         entry->ref_count--;
 445
 446         if (entry->ref_count > 0) {
 447                 DEBUG(10,("remove_ccache: entry %s ref count now %d\n",
 448                         username, entry->ref_count ));
 449                 return NT_STATUS_OK;
 450         }
 451
 452         /* no references any more */
 453
 454         DLIST_REMOVE(ccache_list, entry);
 455         TALLOC_FREE(entry->event); /* unregisters events */
 456
 457 #ifdef HAVE_KRB5
 458         ret = ads_kdestroy(entry->ccname);
 459
 460         /* we ignore the error when there has been no credential cache */
 461         if (ret == KRB5_FCC_NOFILE) {
 462                 ret = 0;
 463         } else if (ret) {
 464                 DEBUG(0,("remove_ccache: failed to destroy user krb5 ccache %s with: %s\n",
 465                         entry->ccname, error_message(ret)));
 466         } else {
 467                 DEBUG(10,("remove_ccache: successfully destroyed krb5 ccache %s for user %s\n",
 468                         entry->ccname, username));
 469         }
 470         status = krb5_to_nt_status(ret);
 471 #endif
 472
 473         TALLOC_FREE(entry);
 474         DEBUG(10,("remove_ccache: removed ccache for user %s\n", username));
 475
 476         return status;
 477 }
 478
 479 /*******************************************************************
 480  In memory credentials cache code.
 481 *******************************************************************/
 482
 483 static struct WINBINDD_MEMORY_CREDS *memory_creds_list;
 484
 485 /***********************************************************
 486  Find an entry on the list by name.
 487 ***********************************************************/
 488
 489 struct WINBINDD_MEMORY_CREDS *find_memory_creds_by_name(const char *username)
 490 {
 491         struct WINBINDD_MEMORY_CREDS *p;
 492
 493         for (p = memory_creds_list; p; p = p->next) {
 494                 if (strequal(p->username, username)) {
 495                         return p;
 496                 }
 497         }
 498         return NULL;
 499 }
 500
 501 /***********************************************************
 502  Store the required creds and mlock them.
 503 ***********************************************************/
 504
 505 static NTSTATUS store_memory_creds(struct WINBINDD_MEMORY_CREDS *memcredp, const char *pass)
 506 {
 507 #if !defined(HAVE_MLOCK)
 508         return NT_STATUS_OK;
 509 #else
 510         /* new_entry->nt_hash is the base pointer for the block
 511            of memory pointed into by new_entry->lm_hash and
 512            new_entry->pass (if we're storing plaintext). */
 513
 514         memcredp->len = NT_HASH_LEN + LM_HASH_LEN;
 515         if (pass) {
 516                 memcredp->len += strlen(pass)+1;
 517         }
 518
 519
 520 #if defined(LINUX)
 521         /* aligning the memory on on x86_64 and compiling
 522            with gcc 4.1 using -O2 causes a segv in the
 523            next memset()  --jerry */
 524         memcredp->nt_hash = SMB_MALLOC_ARRAY(unsigned char, memcredp->len);
 525 #else
 526         /* On non-linux platforms, mlock()'d memory must be aligned */
 527         memcredp->nt_hash = SMB_MEMALIGN_ARRAY(unsigned char,
 528                                                getpagesize(), memcredp->len);
 529 #endif
 530         if (!memcredp->nt_hash) {
 531                 return NT_STATUS_NO_MEMORY;
 532         }
 533         memset( memcredp->nt_hash, 0x0, memcredp->len );
 534
 535         memcredp->lm_hash = memcredp->nt_hash + NT_HASH_LEN;
 536
 537 #ifdef DEBUG_PASSWORD
 538         DEBUG(10,("mlocking memory: %p\n", memcredp->nt_hash));
 539 #endif
 540         if ((mlock(memcredp->nt_hash, memcredp->len)) == -1) {
 541                 DEBUG(0,("failed to mlock memory: %s (%d)\n",
 542                         strerror(errno), errno));
 543                 SAFE_FREE(memcredp->nt_hash);
 544                 return map_nt_error_from_unix(errno);
 545         }
 546
 547 #ifdef DEBUG_PASSWORD
 548         DEBUG(10,("mlocked memory: %p\n", memcredp->nt_hash));
 549 #endif
 550
 551         /* Create and store the password hashes. */
 552         E_md4hash(pass, memcredp->nt_hash);
 553         E_deshash(pass, memcredp->lm_hash);
 554
 555         if (pass) {
 556                 memcredp->pass = (char *)memcredp->lm_hash + LM_HASH_LEN;
 557                 memcpy(memcredp->pass, pass, memcredp->len - NT_HASH_LEN - LM_HASH_LEN);
 558         }
 559
 560         return NT_STATUS_OK;
 561 #endif
 562 }
 563
 564 /***********************************************************
 565  Destroy existing creds.
 566 ***********************************************************/
 567
 568 static NTSTATUS delete_memory_creds(struct WINBINDD_MEMORY_CREDS *memcredp)
 569 {
 570 #if !defined(HAVE_MUNLOCK)
 571         return NT_STATUS_OK;
 572 #else
 573         if (munlock(memcredp->nt_hash, memcredp->len) == -1) {
 574                 DEBUG(0,("failed to munlock memory: %s (%d)\n",
 575                         strerror(errno), errno));
 576                 return map_nt_error_from_unix(errno);
 577         }
 578         memset(memcredp->nt_hash, '\0', memcredp->len);
 579         SAFE_FREE(memcredp->nt_hash);
 580         memcredp->nt_hash = NULL;
 581         memcredp->lm_hash = NULL;
 582         memcredp->pass = NULL;
 583         memcredp->len = 0;
 584         return NT_STATUS_OK;
 585 #endif
 586 }
 587
 588 /***********************************************************
 589  Replace the required creds with new ones (password change).
 590 ***********************************************************/
 591
 592 static NTSTATUS winbindd_replace_memory_creds_internal(struct WINBINDD_MEMORY_CREDS *memcredp,
 593                                                 const char *pass)
 594 {
 595         NTSTATUS status = delete_memory_creds(memcredp);
 596         if (!NT_STATUS_IS_OK(status)) {
 597                 return status;
 598         }
 599         return store_memory_creds(memcredp, pass);
 600 }
 601
 602 /*************************************************************
 603  Store credentials in memory in a list.
 604 *************************************************************/
 605
 606 static NTSTATUS winbindd_add_memory_creds_internal(const char *username, uid_t uid, const char *pass)
 607 {
 608         /* Shortcut to ensure we don't store if no mlock. */
 609 #if !defined(HAVE_MLOCK) || !defined(HAVE_MUNLOCK)
 610         return NT_STATUS_OK;
 611 #else
 612         NTSTATUS status;
 613         struct WINBINDD_MEMORY_CREDS *memcredp = find_memory_creds_by_name(username);
 614
 615         if (uid == (uid_t)-1) {
 616                 DEBUG(0,("winbindd_add_memory_creds_internal: invalid uid for user %s.\n",
 617                         username ));
 618                 return NT_STATUS_INVALID_PARAMETER;
 619         }
 620
 621         if (memcredp) {
 622                 /* Already exists. Increment the reference count and replace stored creds. */
 623                 if (uid != memcredp->uid) {
 624                         DEBUG(0,("winbindd_add_memory_creds_internal: uid %u for user %s doesn't "
 625                                 "match stored uid %u. Replacing.\n",
 626                                 (unsigned int)uid, username, (unsigned int)memcredp->uid ));
 627                         memcredp->uid = uid;
 628                 }
 629                 memcredp->ref_count++;
 630                 DEBUG(10,("winbindd_add_memory_creds_internal: ref count for user %s is now %d\n",
 631                         username, memcredp->ref_count ));
 632                 return winbindd_replace_memory_creds_internal(memcredp, pass);
 633         }
 634
 635         memcredp = TALLOC_ZERO_P(NULL, struct WINBINDD_MEMORY_CREDS);
 636         if (!memcredp) {
 637                 return NT_STATUS_NO_MEMORY;
 638         }
 639         memcredp->username = talloc_strdup(memcredp, username);
 640         if (!memcredp->username) {
 641                 talloc_destroy(memcredp);
 642                 return NT_STATUS_NO_MEMORY;
 643         }
 644
 645         status = store_memory_creds(memcredp, pass);
 646         if (!NT_STATUS_IS_OK(status)) {
 647                 talloc_destroy(memcredp);
 648                 return status;
 649         }
 650
 651         memcredp->uid = uid;
 652         memcredp->ref_count = 1;
 653         DLIST_ADD(memory_creds_list, memcredp);
 654
 655         DEBUG(10,("winbindd_add_memory_creds_internal: added entry for user %s\n",
 656                 username ));
 657
 658         return NT_STATUS_OK;
 659 #endif
 660 }
 661
 662 /*************************************************************
 663  Store users credentials in memory. If we also have a
 664  struct WINBINDD_CCACHE_ENTRY for this username with a
 665  refresh timer, then store the plaintext of the password
 666  and associate the new credentials with the struct WINBINDD_CCACHE_ENTRY.
 667 *************************************************************/
 668
 669 NTSTATUS winbindd_add_memory_creds(const char *username, uid_t uid, const char *pass)
 670 {
 671         struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
 672         NTSTATUS status;
 673
 674         status = winbindd_add_memory_creds_internal(username, uid, pass);
 675         if (!NT_STATUS_IS_OK(status)) {
 676                 return status;
 677         }
 678
 679         if (entry) {
 680                 struct WINBINDD_MEMORY_CREDS *memcredp = find_memory_creds_by_name(username);
 681                 if (memcredp) {
 682                         entry->cred_ptr = memcredp;
 683                 }
 684         }
 685
 686         return status;
 687 }
 688
 689 /*************************************************************
 690  Decrement the in-memory ref count - delete if zero.
 691 *************************************************************/
 692
 693 NTSTATUS winbindd_delete_memory_creds(const char *username)
 694 {
 695         struct WINBINDD_MEMORY_CREDS *memcredp = find_memory_creds_by_name(username);
 696         struct WINBINDD_CCACHE_ENTRY *entry = get_ccache_by_username(username);
 697         NTSTATUS status = NT_STATUS_OK;
 698
 699         if (!memcredp) {
 700                 DEBUG(10,("winbindd_delete_memory_creds: unknown user %s\n",
 701                         username ));
 702                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 703         }
 704
 705         if (memcredp->ref_count <= 0) {
 706                 DEBUG(0,("winbindd_delete_memory_creds: logic error. ref count for user %s = %d\n",
 707                         username, memcredp->ref_count));
 708                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 709         }
 710
 711         memcredp->ref_count--;
 712         if (memcredp->ref_count <= 0) {
 713                 delete_memory_creds(memcredp);
 714                 DLIST_REMOVE(memory_creds_list, memcredp);
 715                 talloc_destroy(memcredp);
 716                 DEBUG(10,("winbindd_delete_memory_creds: deleted entry for user %s\n",
 717                         username));
 718         } else {
 719                 DEBUG(10,("winbindd_delete_memory_creds: entry for user %s ref_count now %d\n",
 720                         username, memcredp->ref_count));
 721         }
 722
 723         if (entry) {
 724                 entry->cred_ptr = NULL; /* Ensure we have no dangling references to this. */
 725         }
 726         return status;
 727 }
 728
 729 /***********************************************************
 730  Replace the required creds with new ones (password change).
 731 ***********************************************************/
 732
 733 NTSTATUS winbindd_replace_memory_creds(const char *username, const char *pass)
 734 {
 735         struct WINBINDD_MEMORY_CREDS *memcredp = find_memory_creds_by_name(username);
 736
 737         if (!memcredp) {
 738                 DEBUG(10,("winbindd_replace_memory_creds: unknown user %s\n",
 739                         username ));
 740                 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
 741         }
 742
 743         DEBUG(10,("winbindd_replace_memory_creds: replaced creds for user %s\n",
 744                 username ));
 745
 746         return winbindd_replace_memory_creds_internal(memcredp, pass);
 747 }