source3/winbindd/winbindd_cm.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon connection manager
   5
   6    Copyright (C) Tim Potter                2001
   7    Copyright (C) Andrew Bartlett           2002
   8    Copyright (C) Gerald (Jerry) Carter     2003-2005.
   9    Copyright (C) Volker Lendecke           2004-2005
  10    Copyright (C) Jeremy Allison            2006
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 /*
  27    We need to manage connections to domain controllers without having to
  28    mess up the main winbindd code with other issues.  The aim of the
  29    connection manager is to:
  30
  31        - make connections to domain controllers and cache them
  32        - re-establish connections when networks or servers go down
  33        - centralise the policy on connection timeouts, domain controller
  34          selection etc
  35        - manage re-entrancy for when winbindd becomes able to handle
  36          multiple outstanding rpc requests
  37
  38    Why not have connection management as part of the rpc layer like tng?
  39    Good question.  This code may morph into libsmb/rpc_cache.c or something
  40    like that but at the moment it's simply staying as part of winbind.  I
  41    think the TNG architecture of forcing every user of the rpc layer to use
  42    the connection caching system is a bad idea.  It should be an optional
  43    method of using the routines.
  44
  45    The TNG design is quite good but I disagree with some aspects of the
  46    implementation. -tpot
  47
  48  */
  49
  50 /*
  51    TODO:
  52
  53      - I'm pretty annoyed by all the make_nmb_name() stuff.  It should be
  54        moved down into another function.
  55
  56      - Take care when destroying cli_structs as they can be shared between
  57        various sam handles.
  58
  59  */
  60
  61 #include "includes.h"
  62 #include "winbindd.h"
  63
  64 #undef DBGC_CLASS
  65 #define DBGC_CLASS DBGC_WINBIND
  66
  67 struct dc_name_ip {
  68         fstring name;
  69         struct sockaddr_storage ss;
  70 };
  71
  72 extern struct winbindd_methods reconnect_methods;
  73 extern bool override_logfile;
  74
  75 static NTSTATUS init_dc_connection_network(struct winbindd_domain *domain);
  76 static void set_dc_type_and_flags( struct winbindd_domain *domain );
  77 static bool get_dcs(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain,
  78                     struct dc_name_ip **dcs, int *num_dcs);
  79
  80 /****************************************************************
  81  Child failed to find DC's. Reschedule check.
  82 ****************************************************************/
  83
  84 static void msg_failed_to_go_online(struct messaging_context *msg,
  85                                     void *private_data,
  86                                     uint32_t msg_type,
  87                                     struct server_id server_id,
  88                                     DATA_BLOB *data)
  89 {
  90         struct winbindd_domain *domain;
  91         const char *domainname = (const char *)data->data;
  92
  93         if (data->data == NULL || data->length == 0) {
  94                 return;
  95         }
  96
  97         DEBUG(5,("msg_fail_to_go_online: received for domain %s.\n", domainname));
  98
  99         for (domain = domain_list(); domain; domain = domain->next) {
 100                 if (domain->internal) {
 101                         continue;
 102                 }
 103
 104                 if (strequal(domain->name, domainname)) {
 105                         if (domain->online) {
 106                                 /* We're already online, ignore. */
 107                                 DEBUG(5,("msg_fail_to_go_online: domain %s "
 108                                         "already online.\n", domainname));
 109                                 continue;
 110                         }
 111
 112                         /* Reschedule the online check. */
 113                         set_domain_offline(domain);
 114                         break;
 115                 }
 116         }
 117 }
 118
 119 /****************************************************************
 120  Actually cause a reconnect from a message.
 121 ****************************************************************/
 122
 123 static void msg_try_to_go_online(struct messaging_context *msg,
 124                                  void *private_data,
 125                                  uint32_t msg_type,
 126                                  struct server_id server_id,
 127                                  DATA_BLOB *data)
 128 {
 129         struct winbindd_domain *domain;
 130         const char *domainname = (const char *)data->data;
 131
 132         if (data->data == NULL || data->length == 0) {
 133                 return;
 134         }
 135
 136         DEBUG(5,("msg_try_to_go_online: received for domain %s.\n", domainname));
 137
 138         for (domain = domain_list(); domain; domain = domain->next) {
 139                 if (domain->internal) {
 140                         continue;
 141                 }
 142
 143                 if (strequal(domain->name, domainname)) {
 144
 145                         if (domain->online) {
 146                                 /* We're already online, ignore. */
 147                                 DEBUG(5,("msg_try_to_go_online: domain %s "
 148                                         "already online.\n", domainname));
 149                                 continue;
 150                         }
 151
 152                         /* This call takes care of setting the online
 153                            flag to true if we connected, or re-adding
 154                            the offline handler if false. Bypasses online
 155                            check so always does network calls. */
 156
 157                         init_dc_connection_network(domain);
 158                         break;
 159                 }
 160         }
 161 }
 162
 163 /****************************************************************
 164  Fork a child to try and contact a DC. Do this as contacting a
 165  DC requires blocking lookups and we don't want to block our
 166  parent.
 167 ****************************************************************/
 168
 169 static bool fork_child_dc_connect(struct winbindd_domain *domain)
 170 {
 171         struct dc_name_ip *dcs = NULL;
 172         int num_dcs = 0;
 173         TALLOC_CTX *mem_ctx = NULL;
 174         pid_t child_pid;
 175         pid_t parent_pid = sys_getpid();
 176
 177         /* Stop zombies */
 178         CatchChild();
 179
 180         child_pid = sys_fork();
 181
 182         if (child_pid == -1) {
 183                 DEBUG(0, ("fork_child_dc_connect: Could not fork: %s\n", strerror(errno)));
 184                 return False;
 185         }
 186
 187         if (child_pid != 0) {
 188                 /* Parent */
 189                 messaging_register(winbind_messaging_context(), NULL,
 190                                    MSG_WINBIND_TRY_TO_GO_ONLINE,
 191                                    msg_try_to_go_online);
 192                 messaging_register(winbind_messaging_context(), NULL,
 193                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 194                                    msg_failed_to_go_online);
 195                 return True;
 196         }
 197
 198         /* Child. */
 199
 200         /* Leave messages blocked - we will never process one. */
 201
 202         if (!reinit_after_fork(winbind_messaging_context(), true)) {
 203                 DEBUG(0,("reinit_after_fork() failed\n"));
 204                 _exit(0);
 205         }
 206
 207         close_conns_after_fork();
 208
 209         if (!override_logfile) {
 210                 char *logfile;
 211                 if (asprintf(&logfile, "%s/log.winbindd-dc-connect", get_dyn_LOGFILEBASE()) > 0) {
 212                         lp_set_logfile(logfile);
 213                         SAFE_FREE(logfile);
 214                         reopen_logs();
 215                 }
 216         }
 217
 218         mem_ctx = talloc_init("fork_child_dc_connect");
 219         if (!mem_ctx) {
 220                 DEBUG(0,("talloc_init failed.\n"));
 221                 _exit(0);
 222         }
 223
 224         if ((!get_dcs(mem_ctx, domain, &dcs, &num_dcs)) || (num_dcs == 0)) {
 225                 /* Still offline ? Can't find DC's. */
 226                 messaging_send_buf(winbind_messaging_context(),
 227                                    pid_to_procid(parent_pid),
 228                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 229                                    (uint8 *)domain->name,
 230                                    strlen(domain->name)+1);
 231                 _exit(0);
 232         }
 233
 234         /* We got a DC. Send a message to our parent to get it to
 235            try and do the same. */
 236
 237         messaging_send_buf(winbind_messaging_context(),
 238                            pid_to_procid(parent_pid),
 239                            MSG_WINBIND_TRY_TO_GO_ONLINE,
 240                            (uint8 *)domain->name,
 241                            strlen(domain->name)+1);
 242         _exit(0);
 243 }
 244
 245 /****************************************************************
 246  Handler triggered if we're offline to try and detect a DC.
 247 ****************************************************************/
 248
 249 static void check_domain_online_handler(struct event_context *ctx,
 250                                         struct timed_event *te,
 251                                         const struct timeval *now,
 252                                         void *private_data)
 253 {
 254         struct winbindd_domain *domain =
 255                 (struct winbindd_domain *)private_data;
 256
 257         DEBUG(10,("check_domain_online_handler: called for domain "
 258                   "%s (online = %s)\n", domain->name,
 259                   domain->online ? "True" : "False" ));
 260
 261         TALLOC_FREE(domain->check_online_event);
 262
 263         /* Are we still in "startup" mode ? */
 264
 265         if (domain->startup && (now->tv_sec > domain->startup_time + 30)) {
 266                 /* No longer in "startup" mode. */
 267                 DEBUG(10,("check_domain_online_handler: domain %s no longer in 'startup' mode.\n",
 268                         domain->name ));
 269                 domain->startup = False;
 270         }
 271
 272         /* We've been told to stay offline, so stay
 273            that way. */
 274
 275         if (get_global_winbindd_state_offline()) {
 276                 DEBUG(10,("check_domain_online_handler: domain %s remaining globally offline\n",
 277                         domain->name ));
 278                 return;
 279         }
 280
 281         /* Fork a child to test if it can contact a DC.
 282            If it can then send ourselves a message to
 283            cause a reconnect. */
 284
 285         fork_child_dc_connect(domain);
 286 }
 287
 288 /****************************************************************
 289  If we're still offline setup the timeout check.
 290 ****************************************************************/
 291
 292 static void calc_new_online_timeout_check(struct winbindd_domain *domain)
 293 {
 294         int wbc = lp_winbind_cache_time();
 295
 296         if (domain->startup) {
 297                 domain->check_online_timeout = 10;
 298         } else if (domain->check_online_timeout < wbc) {
 299                 domain->check_online_timeout = wbc;
 300         }
 301 }
 302
 303 /****************************************************************
 304  Set domain offline and also add handler to put us back online
 305  if we detect a DC.
 306 ****************************************************************/
 307
 308 void set_domain_offline(struct winbindd_domain *domain)
 309 {
 310         DEBUG(10,("set_domain_offline: called for domain %s\n",
 311                 domain->name ));
 312
 313         TALLOC_FREE(domain->check_online_event);
 314
 315         if (domain->internal) {
 316                 DEBUG(3,("set_domain_offline: domain %s is internal - logic error.\n",
 317                         domain->name ));
 318                 return;
 319         }
 320
 321         domain->online = False;
 322
 323         /* Offline domains are always initialized. They're
 324            re-initialized when they go back online. */
 325
 326         domain->initialized = True;
 327
 328         /* We only add the timeout handler that checks and
 329            allows us to go back online when we've not
 330            been told to remain offline. */
 331
 332         if (get_global_winbindd_state_offline()) {
 333                 DEBUG(10,("set_domain_offline: domain %s remaining globally offline\n",
 334                         domain->name ));
 335                 return;
 336         }
 337
 338         /* If we're in statup mode, check again in 10 seconds, not in
 339            lp_winbind_cache_time() seconds (which is 5 mins by default). */
 340
 341         calc_new_online_timeout_check(domain);
 342
 343         domain->check_online_event = event_add_timed(winbind_event_context(),
 344                                                 NULL,
 345                                                 timeval_current_ofs(domain->check_online_timeout,0),
 346                                                 "check_domain_online_handler",
 347                                                 check_domain_online_handler,
 348                                                 domain);
 349
 350         /* The above *has* to succeed for winbindd to work. */
 351         if (!domain->check_online_event) {
 352                 smb_panic("set_domain_offline: failed to add online handler");
 353         }
 354
 355         DEBUG(10,("set_domain_offline: added event handler for domain %s\n",
 356                 domain->name ));
 357
 358         /* Send an offline message to the idmap child when our
 359            primary domain goes offline */
 360
 361         if ( domain->primary ) {
 362                 struct winbindd_child *idmap = idmap_child();
 363
 364                 if ( idmap->pid != 0 ) {
 365                         messaging_send_buf(winbind_messaging_context(),
 366                                            pid_to_procid(idmap->pid),
 367                                            MSG_WINBIND_OFFLINE,
 368                                            (uint8 *)domain->name,
 369                                            strlen(domain->name)+1);
 370                 }
 371         }
 372
 373         return;
 374 }
 375
 376 /****************************************************************
 377  Set domain online - if allowed.
 378 ****************************************************************/
 379
 380 static void set_domain_online(struct winbindd_domain *domain)
 381 {
 382         struct timeval now;
 383
 384         DEBUG(10,("set_domain_online: called for domain %s\n",
 385                 domain->name ));
 386
 387         if (domain->internal) {
 388                 DEBUG(3,("set_domain_online: domain %s is internal - logic error.\n",
 389                         domain->name ));
 390                 return;
 391         }
 392
 393         if (get_global_winbindd_state_offline()) {
 394                 DEBUG(10,("set_domain_online: domain %s remaining globally offline\n",
 395                         domain->name ));
 396                 return;
 397         }
 398
 399         winbindd_set_locator_kdc_envs(domain);
 400
 401         /* If we are waiting to get a krb5 ticket, trigger immediately. */
 402         GetTimeOfDay(&now);
 403         set_event_dispatch_time(winbind_event_context(),
 404                                 "krb5_ticket_gain_handler", now);
 405
 406         /* Ok, we're out of any startup mode now... */
 407         domain->startup = False;
 408
 409         if (domain->online == False) {
 410                 /* We were offline - now we're online. We default to
 411                    using the MS-RPC backend if we started offline,
 412                    and if we're going online for the first time we
 413                    should really re-initialize the backends and the
 414                    checks to see if we're talking to an AD or NT domain.
 415                 */
 416
 417                 domain->initialized = False;
 418
 419                 /* 'reconnect_methods' is the MS-RPC backend. */
 420                 if (domain->backend == &reconnect_methods) {
 421                         domain->backend = NULL;
 422                 }
 423         }
 424
 425         /* Ensure we have no online timeout checks. */
 426         domain->check_online_timeout = 0;
 427         TALLOC_FREE(domain->check_online_event);
 428
 429         /* Ensure we ignore any pending child messages. */
 430         messaging_deregister(winbind_messaging_context(),
 431                              MSG_WINBIND_TRY_TO_GO_ONLINE, NULL);
 432         messaging_deregister(winbind_messaging_context(),
 433                              MSG_WINBIND_FAILED_TO_GO_ONLINE, NULL);
 434
 435         domain->online = True;
 436
 437         /* Send an online message to the idmap child when our
 438            primary domain comes online */
 439
 440         if ( domain->primary ) {
 441                 struct winbindd_child *idmap = idmap_child();
 442
 443                 if ( idmap->pid != 0 ) {
 444                         messaging_send_buf(winbind_messaging_context(),
 445                                            pid_to_procid(idmap->pid),
 446                                            MSG_WINBIND_ONLINE,
 447                                            (uint8 *)domain->name,
 448                                            strlen(domain->name)+1);
 449                 }
 450         }
 451
 452         return;
 453 }
 454
 455 /****************************************************************
 456  Requested to set a domain online.
 457 ****************************************************************/
 458
 459 void set_domain_online_request(struct winbindd_domain *domain)
 460 {
 461         struct timeval tev;
 462
 463         DEBUG(10,("set_domain_online_request: called for domain %s\n",
 464                 domain->name ));
 465
 466         if (get_global_winbindd_state_offline()) {
 467                 DEBUG(10,("set_domain_online_request: domain %s remaining globally offline\n",
 468                         domain->name ));
 469                 return;
 470         }
 471
 472         /* We've been told it's safe to go online and
 473            try and connect to a DC. But I don't believe it
 474            because network manager seems to lie.
 475            Wait at least 5 seconds. Heuristics suck... */
 476
 477         if (!domain->check_online_event) {
 478                 /* If we've come from being globally offline we
 479                    don't have a check online event handler set.
 480                    We need to add one now we're trying to go
 481                    back online. */
 482
 483                 DEBUG(10,("set_domain_online_request: domain %s was globally offline.\n",
 484                         domain->name ));
 485
 486                 domain->check_online_event = event_add_timed(winbind_event_context(),
 487                                                                 NULL,
 488                                                                 timeval_current_ofs(5, 0),
 489                                                                 "check_domain_online_handler",
 490                                                                 check_domain_online_handler,
 491                                                                 domain);
 492
 493                 /* The above *has* to succeed for winbindd to work. */
 494                 if (!domain->check_online_event) {
 495                         smb_panic("set_domain_online_request: failed to add online handler");
 496                 }
 497         }
 498
 499         GetTimeOfDay(&tev);
 500
 501         /* Go into "startup" mode again. */
 502         domain->startup_time = tev.tv_sec;
 503         domain->startup = True;
 504
 505         tev.tv_sec += 5;
 506
 507         set_event_dispatch_time(winbind_event_context(), "check_domain_online_handler", tev);
 508 }
 509
 510 /****************************************************************
 511  Add -ve connection cache entries for domain and realm.
 512 ****************************************************************/
 513
 514 void winbind_add_failed_connection_entry(const struct winbindd_domain *domain,
 515                                         const char *server,
 516                                         NTSTATUS result)
 517 {
 518         add_failed_connection_entry(domain->name, server, result);
 519         /* If this was the saf name for the last thing we talked to,
 520            remove it. */
 521         saf_delete(domain->name);
 522         if (*domain->alt_name) {
 523                 add_failed_connection_entry(domain->alt_name, server, result);
 524                 saf_delete(domain->alt_name);
 525         }
 526         winbindd_unset_locator_kdc_env(domain);
 527 }
 528
 529 /* Choose between anonymous or authenticated connections.  We need to use
 530    an authenticated connection if DCs have the RestrictAnonymous registry
 531    entry set > 0, or the "Additional restrictions for anonymous
 532    connections" set in the win2k Local Security Policy.
 533
 534    Caller to free() result in domain, username, password
 535 */
 536
 537 static void cm_get_ipc_userpass(char **username, char **domain, char **password)
 538 {
 539         *username = (char *)secrets_fetch(SECRETS_AUTH_USER, NULL);
 540         *domain = (char *)secrets_fetch(SECRETS_AUTH_DOMAIN, NULL);
 541         *password = (char *)secrets_fetch(SECRETS_AUTH_PASSWORD, NULL);
 542
 543         if (*username && **username) {
 544
 545                 if (!*domain || !**domain)
 546                         *domain = smb_xstrdup(lp_workgroup());
 547
 548                 if (!*password || !**password)
 549                         *password = smb_xstrdup("");
 550
 551                 DEBUG(3, ("cm_get_ipc_userpass: Retrieved auth-user from secrets.tdb [%s\\%s]\n",
 552                           *domain, *username));
 553
 554         } else {
 555                 DEBUG(3, ("cm_get_ipc_userpass: No auth-user defined\n"));
 556                 *username = smb_xstrdup("");
 557                 *domain = smb_xstrdup("");
 558                 *password = smb_xstrdup("");
 559         }
 560 }
 561
 562 static bool get_dc_name_via_netlogon(struct winbindd_domain *domain,
 563                                      fstring dcname,
 564                                      struct sockaddr_storage *dc_ss)
 565 {
 566         struct winbindd_domain *our_domain = NULL;
 567         struct rpc_pipe_client *netlogon_pipe = NULL;
 568         NTSTATUS result;
 569         WERROR werr;
 570         TALLOC_CTX *mem_ctx;
 571         unsigned int orig_timeout;
 572         const char *tmp = NULL;
 573         const char *p;
 574
 575         /* Hmmmm. We can only open one connection to the NETLOGON pipe at the
 576          * moment.... */
 577
 578         if (IS_DC) {
 579                 return False;
 580         }
 581
 582         if (domain->primary) {
 583                 return False;
 584         }
 585
 586         our_domain = find_our_domain();
 587
 588         if ((mem_ctx = talloc_init("get_dc_name_via_netlogon")) == NULL) {
 589                 return False;
 590         }
 591
 592         result = cm_connect_netlogon(our_domain, &netlogon_pipe);
 593         if (!NT_STATUS_IS_OK(result)) {
 594                 talloc_destroy(mem_ctx);
 595                 return False;
 596         }
 597
 598         /* This call can take a long time - allow the server to time out.
 599            35 seconds should do it. */
 600
 601         orig_timeout = rpccli_set_timeout(netlogon_pipe, 35000);
 602
 603         if (our_domain->active_directory) {
 604                 struct netr_DsRGetDCNameInfo *domain_info = NULL;
 605
 606                 result = rpccli_netr_DsRGetDCName(netlogon_pipe,
 607                                                   mem_ctx,
 608                                                   our_domain->dcname,
 609                                                   domain->name,
 610                                                   NULL,
 611                                                   NULL,
 612                                                   DS_RETURN_DNS_NAME,
 613                                                   &domain_info,
 614                                                   &werr);
 615                 if (W_ERROR_IS_OK(werr)) {
 616                         tmp = talloc_strdup(
 617                                 mem_ctx, domain_info->dc_unc);
 618                         if (tmp == NULL) {
 619                                 DEBUG(0, ("talloc_strdup failed\n"));
 620                                 talloc_destroy(mem_ctx);
 621                                 return false;
 622                         }
 623                         if (strlen(domain->alt_name) == 0) {
 624                                 fstrcpy(domain->alt_name,
 625                                         domain_info->domain_name);
 626                         }
 627                         if (strlen(domain->forest_name) == 0) {
 628                                 fstrcpy(domain->forest_name,
 629                                         domain_info->forest_name);
 630                         }
 631                 }
 632         } else {
 633                 result = rpccli_netr_GetAnyDCName(netlogon_pipe, mem_ctx,
 634                                                   our_domain->dcname,
 635                                                   domain->name,
 636                                                   &tmp,
 637                                                   &werr);
 638         }
 639
 640         /* And restore our original timeout. */
 641         rpccli_set_timeout(netlogon_pipe, orig_timeout);
 642
 643         if (!NT_STATUS_IS_OK(result)) {
 644                 DEBUG(10,("rpccli_netr_GetAnyDCName failed: %s\n",
 645                         nt_errstr(result)));
 646                 talloc_destroy(mem_ctx);
 647                 return false;
 648         }
 649
 650         if (!W_ERROR_IS_OK(werr)) {
 651                 DEBUG(10,("rpccli_netr_GetAnyDCName failed: %s\n",
 652                            dos_errstr(werr)));
 653                 talloc_destroy(mem_ctx);
 654                 return false;
 655         }
 656
 657         /* rpccli_netr_GetAnyDCName gives us a name with \\ */
 658         p = strip_hostname(tmp);
 659
 660         fstrcpy(dcname, p);
 661
 662         talloc_destroy(mem_ctx);
 663
 664         DEBUG(10,("rpccli_netr_GetAnyDCName returned %s\n", dcname));
 665
 666         if (!resolve_name(dcname, dc_ss, 0x20)) {
 667                 return False;
 668         }
 669
 670         return True;
 671 }
 672
 673 /**
 674  * Helper function to assemble trust password and account name
 675  */
 676 static NTSTATUS get_trust_creds(const struct winbindd_domain *domain,
 677                                 char **machine_password,
 678                                 char **machine_account,
 679                                 char **machine_krb5_principal)
 680 {
 681         const char *account_name;
 682         const char *name = NULL;
 683
 684         /* If we are a DC and this is not our own domain */
 685
 686         if (IS_DC) {
 687                 name = domain->name;
 688         } else {
 689                 struct winbindd_domain *our_domain = find_our_domain();
 690
 691                 if (!our_domain)
 692                         return NT_STATUS_INVALID_SERVER_STATE;
 693
 694                 name = our_domain->name;
 695         }
 696
 697         if (!get_trust_pw_clear(name, machine_password,
 698                                 &account_name, NULL))
 699         {
 700                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 701         }
 702
 703         if ((machine_account != NULL) &&
 704             (asprintf(machine_account, "%s$", account_name) == -1))
 705         {
 706                 return NT_STATUS_NO_MEMORY;
 707         }
 708
 709         /* For now assume our machine account only exists in our domain */
 710
 711         if (machine_krb5_principal != NULL)
 712         {
 713                 struct winbindd_domain *our_domain = find_our_domain();
 714
 715                 if (!our_domain) {
 716                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 717                 }
 718
 719                 if (asprintf(machine_krb5_principal, "%s$@%s",
 720                              account_name, our_domain->alt_name) == -1)
 721                 {
 722                         return NT_STATUS_NO_MEMORY;
 723                 }
 724
 725                 strupper_m(*machine_krb5_principal);
 726         }
 727
 728         return NT_STATUS_OK;
 729 }
 730
 731 /************************************************************************
 732  Given a fd with a just-connected TCP connection to a DC, open a connection
 733  to the pipe.
 734 ************************************************************************/
 735
 736 static NTSTATUS cm_prepare_connection(const struct winbindd_domain *domain,
 737                                       const int sockfd,
 738                                       const char *controller,
 739                                       struct cli_state **cli,
 740                                       bool *retry)
 741 {
 742         char *machine_password = NULL;
 743         char *machine_krb5_principal = NULL;
 744         char *machine_account = NULL;
 745         char *ipc_username = NULL;
 746         char *ipc_domain = NULL;
 747         char *ipc_password = NULL;
 748
 749         struct named_mutex *mutex;
 750
 751         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
 752
 753         struct sockaddr peeraddr;
 754         socklen_t peeraddr_len;
 755
 756         struct sockaddr_in *peeraddr_in = (struct sockaddr_in *)&peeraddr;
 757
 758         DEBUG(10,("cm_prepare_connection: connecting to DC %s for domain %s\n",
 759                 controller, domain->name ));
 760
 761         *retry = True;
 762
 763         mutex = grab_named_mutex(talloc_tos(), controller,
 764                                  WINBIND_SERVER_MUTEX_WAIT_TIME);
 765         if (mutex == NULL) {
 766                 DEBUG(0,("cm_prepare_connection: mutex grab failed for %s\n",
 767                          controller));
 768                 result = NT_STATUS_POSSIBLE_DEADLOCK;
 769                 goto done;
 770         }
 771
 772         if ((*cli = cli_initialise()) == NULL) {
 773                 DEBUG(1, ("Could not cli_initialize\n"));
 774                 result = NT_STATUS_NO_MEMORY;
 775                 goto done;
 776         }
 777
 778         (*cli)->timeout = 10000;        /* 10 seconds */
 779         (*cli)->fd = sockfd;
 780         fstrcpy((*cli)->desthost, controller);
 781         (*cli)->use_kerberos = True;
 782
 783         peeraddr_len = sizeof(peeraddr);
 784
 785         if ((getpeername((*cli)->fd, &peeraddr, &peeraddr_len) != 0) ||
 786             (peeraddr_len != sizeof(struct sockaddr_in)) ||
 787             (peeraddr_in->sin_family != PF_INET))
 788         {
 789                 DEBUG(0,("cm_prepare_connection: %s\n", strerror(errno)));
 790                 result = NT_STATUS_UNSUCCESSFUL;
 791                 goto done;
 792         }
 793
 794         if (ntohs(peeraddr_in->sin_port) == 139) {
 795                 struct nmb_name calling;
 796                 struct nmb_name called;
 797
 798                 make_nmb_name(&calling, global_myname(), 0x0);
 799                 make_nmb_name(&called, "*SMBSERVER", 0x20);
 800
 801                 if (!cli_session_request(*cli, &calling, &called)) {
 802                         DEBUG(8, ("cli_session_request failed for %s\n",
 803                                   controller));
 804                         result = NT_STATUS_UNSUCCESSFUL;
 805                         goto done;
 806                 }
 807         }
 808
 809         cli_setup_signing_state(*cli, Undefined);
 810
 811         if (!cli_negprot(*cli)) {
 812                 DEBUG(1, ("cli_negprot failed\n"));
 813                 result = NT_STATUS_UNSUCCESSFUL;
 814                 goto done;
 815         }
 816
 817         if (!is_dc_trusted_domain_situation(domain->name) &&
 818             (*cli)->protocol >= PROTOCOL_NT1 &&
 819             (*cli)->capabilities & CAP_EXTENDED_SECURITY)
 820         {
 821                 ADS_STATUS ads_status;
 822
 823                 result = get_trust_creds(domain, &machine_password,
 824                                          &machine_account,
 825                                          &machine_krb5_principal);
 826                 if (!NT_STATUS_IS_OK(result)) {
 827                         goto anon_fallback;
 828                 }
 829
 830                 if (lp_security() == SEC_ADS) {
 831
 832                         /* Try a krb5 session */
 833
 834                         (*cli)->use_kerberos = True;
 835                         DEBUG(5, ("connecting to %s from %s with kerberos principal "
 836                                   "[%s] and realm [%s]\n", controller, global_myname(),
 837                                   machine_krb5_principal, domain->alt_name));
 838
 839                         winbindd_set_locator_kdc_envs(domain);
 840
 841                         ads_status = cli_session_setup_spnego(*cli,
 842                                                               machine_krb5_principal,
 843                                                               machine_password,
 844                                                               lp_workgroup(),
 845                                                               domain->name);
 846
 847                         if (!ADS_ERR_OK(ads_status)) {
 848                                 DEBUG(4,("failed kerberos session setup with %s\n",
 849                                          ads_errstr(ads_status)));
 850                         }
 851
 852                         result = ads_ntstatus(ads_status);
 853                         if (NT_STATUS_IS_OK(result)) {
 854                                 /* Ensure creds are stored for NTLMSSP authenticated pipe access. */
 855                                 cli_init_creds(*cli, machine_account, domain->name, machine_password);
 856                                 goto session_setup_done;
 857                         }
 858                 }
 859
 860                 /* Fall back to non-kerberos session setup using NTLMSSP SPNEGO with the machine account. */
 861                 (*cli)->use_kerberos = False;
 862
 863                 DEBUG(5, ("connecting to %s from %s with username "
 864                           "[%s]\\[%s]\n",  controller, global_myname(),
 865                           lp_workgroup(), machine_account));
 866
 867                 ads_status = cli_session_setup_spnego(*cli,
 868                                                       machine_account,
 869                                                       machine_password,
 870                                                       lp_workgroup(),
 871                                                       NULL);
 872                 if (!ADS_ERR_OK(ads_status)) {
 873                         DEBUG(4, ("authenticated session setup failed with %s\n",
 874                                 ads_errstr(ads_status)));
 875                 }
 876
 877                 result = ads_ntstatus(ads_status);
 878                 if (NT_STATUS_IS_OK(result)) {
 879                         /* Ensure creds are stored for NTLMSSP authenticated pipe access. */
 880                         cli_init_creds(*cli, machine_account, domain->name, machine_password);
 881                         goto session_setup_done;
 882                 }
 883         }
 884
 885         /* Fall back to non-kerberos session setup with auth_user */
 886
 887         (*cli)->use_kerberos = False;
 888
 889         cm_get_ipc_userpass(&ipc_username, &ipc_domain, &ipc_password);
 890
 891         if ((((*cli)->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) != 0) &&
 892             (strlen(ipc_username) > 0)) {
 893
 894                 /* Only try authenticated if we have a username */
 895
 896                 DEBUG(5, ("connecting to %s from %s with username "
 897                           "[%s]\\[%s]\n",  controller, global_myname(),
 898                           ipc_domain, ipc_username));
 899
 900                 if (NT_STATUS_IS_OK(cli_session_setup(
 901                                             *cli, ipc_username,
 902                                             ipc_password, strlen(ipc_password)+1,
 903                                             ipc_password, strlen(ipc_password)+1,
 904                                             ipc_domain))) {
 905                         /* Successful logon with given username. */
 906                         cli_init_creds(*cli, ipc_username, ipc_domain, ipc_password);
 907                         goto session_setup_done;
 908                 } else {
 909                         DEBUG(4, ("authenticated session setup with user %s\\%s failed.\n",
 910                                 ipc_domain, ipc_username ));
 911                 }
 912         }
 913
 914  anon_fallback:
 915
 916         /* Fall back to anonymous connection, this might fail later */
 917
 918         if (NT_STATUS_IS_OK(cli_session_setup(*cli, "", NULL, 0,
 919                                               NULL, 0, ""))) {
 920                 DEBUG(5, ("Connected anonymously\n"));
 921                 cli_init_creds(*cli, "", "", "");
 922                 goto session_setup_done;
 923         }
 924
 925         result = cli_nt_error(*cli);
 926
 927         if (NT_STATUS_IS_OK(result))
 928                 result = NT_STATUS_UNSUCCESSFUL;
 929
 930         /* We can't session setup */
 931
 932         goto done;
 933
 934  session_setup_done:
 935
 936         /* cache the server name for later connections */
 937
 938         saf_store( domain->name, (*cli)->desthost );
 939         if (domain->alt_name && (*cli)->use_kerberos) {
 940                 saf_store( domain->alt_name, (*cli)->desthost );
 941         }
 942
 943         winbindd_set_locator_kdc_envs(domain);
 944
 945         if (!cli_send_tconX(*cli, "IPC$", "IPC", "", 0)) {
 946
 947                 result = cli_nt_error(*cli);
 948
 949                 DEBUG(1,("failed tcon_X with %s\n", nt_errstr(result)));
 950
 951                 if (NT_STATUS_IS_OK(result))
 952                         result = NT_STATUS_UNSUCCESSFUL;
 953
 954                 goto done;
 955         }
 956
 957         TALLOC_FREE(mutex);
 958         *retry = False;
 959
 960         /* set the domain if empty; needed for schannel connections */
 961         if ( !*(*cli)->domain ) {
 962                 fstrcpy( (*cli)->domain, domain->name );
 963         }
 964
 965         result = NT_STATUS_OK;
 966
 967  done:
 968         TALLOC_FREE(mutex);
 969         SAFE_FREE(machine_account);
 970         SAFE_FREE(machine_password);
 971         SAFE_FREE(machine_krb5_principal);
 972         SAFE_FREE(ipc_username);
 973         SAFE_FREE(ipc_domain);
 974         SAFE_FREE(ipc_password);
 975
 976         if (!NT_STATUS_IS_OK(result)) {
 977                 winbind_add_failed_connection_entry(domain, controller, result);
 978                 if ((*cli) != NULL) {
 979                         cli_shutdown(*cli);
 980                         *cli = NULL;
 981                 }
 982         }
 983
 984         return result;
 985 }
 986
 987 static bool add_one_dc_unique(TALLOC_CTX *mem_ctx, const char *domain_name,
 988                               const char *dcname, struct sockaddr_storage *pss,
 989                               struct dc_name_ip **dcs, int *num)
 990 {
 991         if (!NT_STATUS_IS_OK(check_negative_conn_cache(domain_name, dcname))) {
 992                 DEBUG(10, ("DC %s was in the negative conn cache\n", dcname));
 993                 return False;
 994         }
 995
 996         *dcs = TALLOC_REALLOC_ARRAY(mem_ctx, *dcs, struct dc_name_ip, (*num)+1);
 997
 998         if (*dcs == NULL)
 999                 return False;
1000
1001         fstrcpy((*dcs)[*num].name, dcname);
1002         (*dcs)[*num].ss = *pss;
1003         *num += 1;
1004         return True;
1005 }
1006
1007 static bool add_sockaddr_to_array(TALLOC_CTX *mem_ctx,
1008                                   struct sockaddr_storage *pss, uint16 port,
1009                                   struct sockaddr_storage **addrs, int *num)
1010 {
1011         *addrs = TALLOC_REALLOC_ARRAY(mem_ctx, *addrs, struct sockaddr_storage, (*num)+1);
1012
1013         if (*addrs == NULL) {
1014                 *num = 0;
1015                 return False;
1016         }
1017
1018         (*addrs)[*num] = *pss;
1019         set_sockaddr_port(&(*addrs)[*num], port);
1020
1021         *num += 1;
1022         return True;
1023 }
1024
1025 /*******************************************************************
1026  convert an ip to a name
1027 *******************************************************************/
1028
1029 static bool dcip_to_name(TALLOC_CTX *mem_ctx,
1030                 const struct winbindd_domain *domain,
1031                 struct sockaddr_storage *pss,
1032                 fstring name )
1033 {
1034         struct ip_service ip_list;
1035         uint32_t nt_version = NETLOGON_VERSION_1;
1036
1037         ip_list.ss = *pss;
1038         ip_list.port = 0;
1039
1040 #ifdef WITH_ADS
1041         /* For active directory servers, try to get the ldap server name.
1042            None of these failures should be considered critical for now */
1043
1044         if (lp_security() == SEC_ADS) {
1045                 ADS_STRUCT *ads;
1046                 ADS_STATUS ads_status;
1047                 char addr[INET6_ADDRSTRLEN];
1048
1049                 print_sockaddr(addr, sizeof(addr), pss);
1050
1051                 ads = ads_init(domain->alt_name, domain->name, addr);
1052                 ads->auth.flags |= ADS_AUTH_NO_BIND;
1053
1054                 ads_status = ads_connect(ads);
1055                 if (ADS_ERR_OK(ads_status)) {
1056                         /* We got a cldap packet. */
1057                         fstrcpy(name, ads->config.ldap_server_name);
1058                         namecache_store(name, 0x20, 1, &ip_list);
1059
1060                         DEBUG(10,("dcip_to_name: flags = 0x%x\n", (unsigned int)ads->config.flags));
1061
1062                         if (domain->primary && (ads->config.flags & NBT_SERVER_KDC)) {
1063                                 if (ads_closest_dc(ads)) {
1064                                         char *sitename = sitename_fetch(ads->config.realm);
1065
1066                                         /* We're going to use this KDC for this realm/domain.
1067                                            If we are using sites, then force the krb5 libs
1068                                            to use this KDC. */
1069
1070                                         create_local_private_krb5_conf_for_domain(domain->alt_name,
1071                                                                         domain->name,
1072                                                                         sitename,
1073                                                                         pss);
1074
1075                                         SAFE_FREE(sitename);
1076                                 } else {
1077                                         /* use an off site KDC */
1078                                         create_local_private_krb5_conf_for_domain(domain->alt_name,
1079                                                                         domain->name,
1080                                                                         NULL,
1081                                                                         pss);
1082                                 }
1083                                 winbindd_set_locator_kdc_envs(domain);
1084
1085                                 /* Ensure we contact this DC also. */
1086                                 saf_store( domain->name, name);
1087                                 saf_store( domain->alt_name, name);
1088                         }
1089
1090                         ads_destroy( &ads );
1091                         return True;
1092                 }
1093
1094                 ads_destroy( &ads );
1095         }
1096 #endif
1097
1098         /* try GETDC requests next */
1099
1100         if (send_getdc_request(mem_ctx, winbind_messaging_context(),
1101                                pss, domain->name, &domain->sid,
1102                                nt_version)) {
1103                 const char *dc_name = NULL;
1104                 int i;
1105                 smb_msleep(100);
1106                 for (i=0; i<5; i++) {
1107                         if (receive_getdc_response(mem_ctx, pss, domain->name,
1108                                                    &nt_version,
1109                                                    &dc_name, NULL)) {
1110                                 fstrcpy(name, dc_name);
1111                                 namecache_store(name, 0x20, 1, &ip_list);
1112                                 return True;
1113                         }
1114                         smb_msleep(500);
1115                 }
1116         }
1117
1118         /* try node status request */
1119
1120         if ( name_status_find(domain->name, 0x1c, 0x20, pss, name) ) {
1121                 namecache_store(name, 0x20, 1, &ip_list);
1122                 return True;
1123         }
1124         return False;
1125 }
1126
1127 /*******************************************************************
1128  Retreive a list of IP address for domain controllers.  Fill in
1129  the dcs[]  with results.
1130 *******************************************************************/
1131
1132 static bool get_dcs(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain,
1133                     struct dc_name_ip **dcs, int *num_dcs)
1134 {
1135         fstring dcname;
1136         struct  sockaddr_storage ss;
1137         struct  ip_service *ip_list = NULL;
1138         int     iplist_size = 0;
1139         int     i;
1140         bool    is_our_domain;
1141         enum security_types sec = (enum security_types)lp_security();
1142
1143         is_our_domain = strequal(domain->name, lp_workgroup());
1144
1145         if ( !is_our_domain
1146                 && get_dc_name_via_netlogon(domain, dcname, &ss)
1147                 && add_one_dc_unique(mem_ctx, domain->name, dcname, &ss, dcs, num_dcs) )
1148         {
1149                 char addr[INET6_ADDRSTRLEN];
1150                 print_sockaddr(addr, sizeof(addr), &ss);
1151                 DEBUG(10, ("Retrieved DC %s at %s via netlogon\n",
1152                            dcname, addr));
1153                 return True;
1154         }
1155
1156         if (sec == SEC_ADS) {
1157                 char *sitename = NULL;
1158
1159                 /* We need to make sure we know the local site before
1160                    doing any DNS queries, as this will restrict the
1161                    get_sorted_dc_list() call below to only fetching
1162                    DNS records for the correct site. */
1163
1164                 /* Find any DC to get the site record.
1165                    We deliberately don't care about the
1166                    return here. */
1167
1168                 get_dc_name(domain->name, domain->alt_name, dcname, &ss);
1169
1170                 sitename = sitename_fetch(domain->alt_name);
1171                 if (sitename) {
1172
1173                         /* Do the site-specific AD dns lookup first. */
1174                         get_sorted_dc_list(domain->alt_name, sitename, &ip_list, &iplist_size, True);
1175
1176                         for ( i=0; i<iplist_size; i++ ) {
1177                                 char addr[INET6_ADDRSTRLEN];
1178                                 print_sockaddr(addr, sizeof(addr),
1179                                                 &ip_list[i].ss);
1180                                 add_one_dc_unique(mem_ctx,
1181                                                 domain->name,
1182                                                 addr,
1183                                                 &ip_list[i].ss,
1184                                                 dcs,
1185                                                 num_dcs);
1186                         }
1187
1188                         SAFE_FREE(ip_list);
1189                         SAFE_FREE(sitename);
1190                         iplist_size = 0;
1191                 }
1192
1193                 /* Now we add DCs from the main AD dns lookup. */
1194                 get_sorted_dc_list(domain->alt_name, NULL, &ip_list, &iplist_size, True);
1195
1196                 for ( i=0; i<iplist_size; i++ ) {
1197                         char addr[INET6_ADDRSTRLEN];
1198                         print_sockaddr(addr, sizeof(addr),
1199                                         &ip_list[i].ss);
1200                         add_one_dc_unique(mem_ctx,
1201                                         domain->name,
1202                                         addr,
1203                                         &ip_list[i].ss,
1204                                         dcs,
1205                                         num_dcs);
1206                 }
1207         }
1208
1209         /* try standard netbios queries if no ADS */
1210
1211         if (iplist_size==0) {
1212                 get_sorted_dc_list(domain->name, NULL, &ip_list, &iplist_size, False);
1213         }
1214
1215         /* FIXME!! this is where we should re-insert the GETDC requests --jerry */
1216
1217         /* now add to the dc array.  We'll wait until the last minute
1218            to look up the name of the DC.  But we fill in the char* for
1219            the ip now in to make the failed connection cache work */
1220
1221         for ( i=0; i<iplist_size; i++ ) {
1222                 char addr[INET6_ADDRSTRLEN];
1223                 print_sockaddr(addr, sizeof(addr),
1224                                 &ip_list[i].ss);
1225                 add_one_dc_unique(mem_ctx, domain->name, addr,
1226                         &ip_list[i].ss, dcs, num_dcs);
1227         }
1228
1229         SAFE_FREE( ip_list );
1230
1231         return True;
1232 }
1233
1234 static bool find_new_dc(TALLOC_CTX *mem_ctx,
1235                         struct winbindd_domain *domain,
1236                         fstring dcname, struct sockaddr_storage *pss, int *fd)
1237 {
1238         struct dc_name_ip *dcs = NULL;
1239         int num_dcs = 0;
1240
1241         const char **dcnames = NULL;
1242         int num_dcnames = 0;
1243
1244         struct sockaddr_storage *addrs = NULL;
1245         int num_addrs = 0;
1246
1247         int i, fd_index;
1248
1249         *fd = -1;
1250
1251  again:
1252         if (!get_dcs(mem_ctx, domain, &dcs, &num_dcs) || (num_dcs == 0))
1253                 return False;
1254
1255         for (i=0; i<num_dcs; i++) {
1256
1257                 if (!add_string_to_array(mem_ctx, dcs[i].name,
1258                                     &dcnames, &num_dcnames)) {
1259                         return False;
1260                 }
1261                 if (!add_sockaddr_to_array(mem_ctx, &dcs[i].ss, 445,
1262                                       &addrs, &num_addrs)) {
1263                         return False;
1264                 }
1265
1266                 if (!add_string_to_array(mem_ctx, dcs[i].name,
1267                                     &dcnames, &num_dcnames)) {
1268                         return False;
1269                 }
1270                 if (!add_sockaddr_to_array(mem_ctx, &dcs[i].ss, 139,
1271                                       &addrs, &num_addrs)) {
1272                         return False;
1273                 }
1274         }
1275
1276         if ((num_dcnames == 0) || (num_dcnames != num_addrs))
1277                 return False;
1278
1279         if ((addrs == NULL) || (dcnames == NULL))
1280                 return False;
1281
1282         /* 5 second timeout. */
1283         if (!open_any_socket_out(addrs, num_addrs, 5000, &fd_index, fd) ) {
1284                 for (i=0; i<num_dcs; i++) {
1285                         char ab[INET6_ADDRSTRLEN];
1286                         print_sockaddr(ab, sizeof(ab), &dcs[i].ss);
1287                         DEBUG(10, ("find_new_dc: open_any_socket_out failed for "
1288                                 "domain %s address %s. Error was %s\n",
1289                                 domain->name, ab, strerror(errno) ));
1290                         winbind_add_failed_connection_entry(domain,
1291                                 dcs[i].name, NT_STATUS_UNSUCCESSFUL);
1292                 }
1293                 return False;
1294         }
1295
1296         *pss = addrs[fd_index];
1297
1298         if (*dcnames[fd_index] != '\0' && !is_ipaddress(dcnames[fd_index])) {
1299                 /* Ok, we've got a name for the DC */
1300                 fstrcpy(dcname, dcnames[fd_index]);
1301                 return True;
1302         }
1303
1304         /* Try to figure out the name */
1305         if (dcip_to_name(mem_ctx, domain, pss, dcname)) {
1306                 return True;
1307         }
1308
1309         /* We can not continue without the DC's name */
1310         winbind_add_failed_connection_entry(domain, dcs[fd_index].name,
1311                                     NT_STATUS_UNSUCCESSFUL);
1312
1313         /* Throw away all arrays as we're doing this again. */
1314         TALLOC_FREE(dcs);
1315         num_dcs = 0;
1316
1317         TALLOC_FREE(dcnames);
1318         num_dcnames = 0;
1319
1320         TALLOC_FREE(addrs);
1321         num_addrs = 0;
1322
1323         *fd = -1;
1324
1325         goto again;
1326 }
1327
1328 static NTSTATUS cm_open_connection(struct winbindd_domain *domain,
1329                                    struct winbindd_cm_conn *new_conn)
1330 {
1331         TALLOC_CTX *mem_ctx;
1332         NTSTATUS result;
1333         char *saf_servername = saf_fetch( domain->name );
1334         int retries;
1335
1336         if ((mem_ctx = talloc_init("cm_open_connection")) == NULL) {
1337                 SAFE_FREE(saf_servername);
1338                 set_domain_offline(domain);
1339                 return NT_STATUS_NO_MEMORY;
1340         }
1341
1342         /* we have to check the server affinity cache here since
1343            later we selecte a DC based on response time and not preference */
1344
1345         /* Check the negative connection cache
1346            before talking to it. It going down may have
1347            triggered the reconnection. */
1348
1349         if ( saf_servername && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, saf_servername))) {
1350
1351                 DEBUG(10,("cm_open_connection: saf_servername is '%s' for domain %s\n",
1352                         saf_servername, domain->name ));
1353
1354                 /* convert an ip address to a name */
1355                 if (is_ipaddress( saf_servername ) ) {
1356                         fstring saf_name;
1357                         struct sockaddr_storage ss;
1358
1359                         if (!interpret_string_addr(&ss, saf_servername,
1360                                                 AI_NUMERICHOST)) {
1361                                 return NT_STATUS_UNSUCCESSFUL;
1362                         }
1363                         if (dcip_to_name(mem_ctx, domain, &ss, saf_name )) {
1364                                 fstrcpy( domain->dcname, saf_name );
1365                         } else {
1366                                 winbind_add_failed_connection_entry(
1367                                         domain, saf_servername,
1368                                         NT_STATUS_UNSUCCESSFUL);
1369                         }
1370                 } else {
1371                         fstrcpy( domain->dcname, saf_servername );
1372                 }
1373
1374                 SAFE_FREE( saf_servername );
1375         }
1376
1377         for (retries = 0; retries < 3; retries++) {
1378                 int fd = -1;
1379                 bool retry = False;
1380
1381                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1382
1383                 DEBUG(10,("cm_open_connection: dcname is '%s' for domain %s\n",
1384                         domain->dcname, domain->name ));
1385
1386                 if (*domain->dcname
1387                         && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, domain->dcname))
1388                         && (resolve_name(domain->dcname, &domain->dcaddr, 0x20)))
1389                 {
1390                         struct sockaddr_storage *addrs = NULL;
1391                         int num_addrs = 0;
1392                         int dummy = 0;
1393
1394                         if (!add_sockaddr_to_array(mem_ctx, &domain->dcaddr, 445, &addrs, &num_addrs)) {
1395                                 set_domain_offline(domain);
1396                                 talloc_destroy(mem_ctx);
1397                                 return NT_STATUS_NO_MEMORY;
1398                         }
1399                         if (!add_sockaddr_to_array(mem_ctx, &domain->dcaddr, 139, &addrs, &num_addrs)) {
1400                                 set_domain_offline(domain);
1401                                 talloc_destroy(mem_ctx);
1402                                 return NT_STATUS_NO_MEMORY;
1403                         }
1404
1405                         /* 5 second timeout. */
1406                         if (!open_any_socket_out(addrs, num_addrs, 5000, &dummy, &fd)) {
1407                                 fd = -1;
1408                         }
1409                 }
1410
1411                 if ((fd == -1)
1412                         && !find_new_dc(mem_ctx, domain, domain->dcname, &domain->dcaddr, &fd))
1413                 {
1414                         /* This is the one place where we will
1415                            set the global winbindd offline state
1416                            to true, if a "WINBINDD_OFFLINE" entry
1417                            is found in the winbindd cache. */
1418                         set_global_winbindd_state_offline();
1419                         break;
1420                 }
1421
1422                 new_conn->cli = NULL;
1423
1424                 result = cm_prepare_connection(domain, fd, domain->dcname,
1425                         &new_conn->cli, &retry);
1426
1427                 if (!retry)
1428                         break;
1429         }
1430
1431         if (NT_STATUS_IS_OK(result)) {
1432
1433                 winbindd_set_locator_kdc_envs(domain);
1434
1435                 if (domain->online == False) {
1436                         /* We're changing state from offline to online. */
1437                         set_global_winbindd_state_online();
1438                 }
1439                 set_domain_online(domain);
1440         } else {
1441                 /* Ensure we setup the retry handler. */
1442                 set_domain_offline(domain);
1443         }
1444
1445         talloc_destroy(mem_ctx);
1446         return result;
1447 }
1448
1449 /* Close down all open pipes on a connection. */
1450
1451 void invalidate_cm_connection(struct winbindd_cm_conn *conn)
1452 {
1453         /* We're closing down a possibly dead
1454            connection. Don't have impossibly long (10s) timeouts. */
1455
1456         if (conn->cli) {
1457                 cli_set_timeout(conn->cli, 1000); /* 1 second. */
1458         }
1459
1460         if (conn->samr_pipe != NULL) {
1461                 TALLOC_FREE(conn->samr_pipe);
1462                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1463                 if (conn->cli) {
1464                         cli_set_timeout(conn->cli, 500);
1465                 }
1466         }
1467
1468         if (conn->lsa_pipe != NULL) {
1469                 TALLOC_FREE(conn->lsa_pipe);
1470                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1471                 if (conn->cli) {
1472                         cli_set_timeout(conn->cli, 500);
1473                 }
1474         }
1475
1476         if (conn->netlogon_pipe != NULL) {
1477                 TALLOC_FREE(conn->netlogon_pipe);
1478                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1479                 if (conn->cli) {
1480                         cli_set_timeout(conn->cli, 500);
1481                 }
1482         }
1483
1484         if (conn->cli) {
1485                 cli_shutdown(conn->cli);
1486         }
1487
1488         conn->cli = NULL;
1489 }
1490
1491 void close_conns_after_fork(void)
1492 {
1493         struct winbindd_domain *domain;
1494
1495         for (domain = domain_list(); domain; domain = domain->next) {
1496                 if (domain->conn.cli == NULL)
1497                         continue;
1498
1499                 if (domain->conn.cli->fd == -1)
1500                         continue;
1501
1502                 close(domain->conn.cli->fd);
1503                 domain->conn.cli->fd = -1;
1504         }
1505 }
1506
1507 static bool connection_ok(struct winbindd_domain *domain)
1508 {
1509         if (domain->conn.cli == NULL) {
1510                 DEBUG(8, ("connection_ok: Connection to %s for domain %s has NULL "
1511                           "cli!\n", domain->dcname, domain->name));
1512                 return False;
1513         }
1514
1515         if (!domain->conn.cli->initialised) {
1516                 DEBUG(3, ("connection_ok: Connection to %s for domain %s was never "
1517                           "initialised!\n", domain->dcname, domain->name));
1518                 return False;
1519         }
1520
1521         if (domain->conn.cli->fd == -1) {
1522                 DEBUG(3, ("connection_ok: Connection to %s for domain %s has died or was "
1523                           "never started (fd == -1)\n",
1524                           domain->dcname, domain->name));
1525                 return False;
1526         }
1527
1528         if (domain->online == False) {
1529                 DEBUG(3, ("connection_ok: Domain %s is offline\n", domain->name));
1530                 return False;
1531         }
1532
1533         return True;
1534 }
1535
1536 /* Initialize a new connection up to the RPC BIND.
1537    Bypass online status check so always does network calls. */
1538
1539 static NTSTATUS init_dc_connection_network(struct winbindd_domain *domain)
1540 {
1541         NTSTATUS result;
1542
1543         /* Internal connections never use the network. */
1544         if (domain->internal) {
1545                 domain->initialized = True;
1546                 return NT_STATUS_OK;
1547         }
1548
1549         if (connection_ok(domain)) {
1550                 if (!domain->initialized) {
1551                         set_dc_type_and_flags(domain);
1552                 }
1553                 return NT_STATUS_OK;
1554         }
1555
1556         invalidate_cm_connection(&domain->conn);
1557
1558         result = cm_open_connection(domain, &domain->conn);
1559
1560         if (NT_STATUS_IS_OK(result) && !domain->initialized) {
1561                 set_dc_type_and_flags(domain);
1562         }
1563
1564         return result;
1565 }
1566
1567 NTSTATUS init_dc_connection(struct winbindd_domain *domain)
1568 {
1569         if (domain->initialized && !domain->online) {
1570                 /* We check for online status elsewhere. */
1571                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1572         }
1573
1574         return init_dc_connection_network(domain);
1575 }
1576
1577 /******************************************************************************
1578  Set the trust flags (direction and forest location) for a domain
1579 ******************************************************************************/
1580
1581 static bool set_dc_type_and_flags_trustinfo( struct winbindd_domain *domain )
1582 {
1583         struct winbindd_domain *our_domain;
1584         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
1585         struct netr_DomainTrustList trusts;
1586         int i;
1587         uint32 flags = (NETR_TRUST_FLAG_IN_FOREST |
1588                         NETR_TRUST_FLAG_OUTBOUND |
1589                         NETR_TRUST_FLAG_INBOUND);
1590         struct rpc_pipe_client *cli;
1591         TALLOC_CTX *mem_ctx = NULL;
1592
1593         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s\n", domain->name ));
1594
1595         /* Our primary domain doesn't need to worry about trust flags.
1596            Force it to go through the network setup */
1597         if ( domain->primary ) {
1598                 return False;
1599         }
1600
1601         our_domain = find_our_domain();
1602
1603         if ( !connection_ok(our_domain) ) {
1604                 DEBUG(3,("set_dc_type_and_flags_trustinfo: No connection to our domain!\n"));
1605                 return False;
1606         }
1607
1608         /* This won't work unless our domain is AD */
1609
1610         if ( !our_domain->active_directory ) {
1611                 return False;
1612         }
1613
1614         /* Use DsEnumerateDomainTrusts to get us the trust direction
1615            and type */
1616
1617         result = cm_connect_netlogon(our_domain, &cli);
1618
1619         if (!NT_STATUS_IS_OK(result)) {
1620                 DEBUG(5, ("set_dc_type_and_flags_trustinfo: Could not open "
1621                           "a connection to %s for PIPE_NETLOGON (%s)\n",
1622                           domain->name, nt_errstr(result)));
1623                 return False;
1624         }
1625
1626         if ( (mem_ctx = talloc_init("set_dc_type_and_flags_trustinfo")) == NULL ) {
1627                 DEBUG(0,("set_dc_type_and_flags_trustinfo: talloc_init() failed!\n"));
1628                 return False;
1629         }
1630
1631         result = rpccli_netr_DsrEnumerateDomainTrusts(cli, mem_ctx,
1632                                                       cli->desthost,
1633                                                       flags,
1634                                                       &trusts,
1635                                                       NULL);
1636         if (!NT_STATUS_IS_OK(result)) {
1637                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1638                         "failed to query trusted domain list: %s\n",
1639                         nt_errstr(result)));
1640                 talloc_destroy(mem_ctx);
1641                 return false;
1642         }
1643
1644         /* Now find the domain name and get the flags */
1645
1646         for ( i=0; i<trusts.count; i++ ) {
1647                 if ( strequal( domain->name, trusts.array[i].netbios_name) ) {
1648                         domain->domain_flags          = trusts.array[i].trust_flags;
1649                         domain->domain_type           = trusts.array[i].trust_type;
1650                         domain->domain_trust_attribs  = trusts.array[i].trust_attributes;
1651
1652                         if ( domain->domain_type == NETR_TRUST_TYPE_UPLEVEL )
1653                                 domain->active_directory = True;
1654
1655                         /* This flag is only set if the domain is *our*
1656                            primary domain and the primary domain is in
1657                            native mode */
1658
1659                         domain->native_mode = (domain->domain_flags & NETR_TRUST_FLAG_NATIVE);
1660
1661                         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s is %sin "
1662                                   "native mode.\n", domain->name,
1663                                   domain->native_mode ? "" : "NOT "));
1664
1665                         DEBUG(5,("set_dc_type_and_flags_trustinfo: domain %s is %s"
1666                                  "running active directory.\n", domain->name,
1667                                  domain->active_directory ? "" : "NOT "));
1668
1669
1670                         domain->initialized = True;
1671
1672                         if ( !winbindd_can_contact_domain( domain) )
1673                                 domain->internal = True;
1674
1675                         break;
1676                 }
1677         }
1678
1679         talloc_destroy( mem_ctx );
1680
1681         return domain->initialized;
1682 }
1683
1684 /******************************************************************************
1685  We can 'sense' certain things about the DC by it's replies to certain
1686  questions.
1687
1688  This tells us if this particular remote server is Active Directory, and if it
1689  is native mode.
1690 ******************************************************************************/
1691
1692 static void set_dc_type_and_flags_connect( struct winbindd_domain *domain )
1693 {
1694         NTSTATUS                result;
1695         WERROR werr;
1696         TALLOC_CTX              *mem_ctx = NULL;
1697         struct rpc_pipe_client  *cli;
1698         POLICY_HND pol;
1699         union dssetup_DsRoleInfo info;
1700         union lsa_PolicyInformation *lsa_info = NULL;
1701
1702         if (!connection_ok(domain)) {
1703                 return;
1704         }
1705
1706         mem_ctx = talloc_init("set_dc_type_and_flags on domain %s\n",
1707                               domain->name);
1708         if (!mem_ctx) {
1709                 DEBUG(1, ("set_dc_type_and_flags_connect: talloc_init() failed\n"));
1710                 return;
1711         }
1712
1713         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s\n", domain->name ));
1714
1715         result = cli_rpc_pipe_open_noauth(domain->conn.cli,
1716                                           &ndr_table_dssetup.syntax_id,
1717                                           &cli);
1718
1719         if (!NT_STATUS_IS_OK(result)) {
1720                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
1721                           "PI_DSSETUP on domain %s: (%s)\n",
1722                           domain->name, nt_errstr(result)));
1723
1724                 /* if this is just a non-AD domain we need to continue
1725                  * identifying so that we can in the end return with
1726                  * domain->initialized = True - gd */
1727
1728                 goto no_dssetup;
1729         }
1730
1731         result = rpccli_dssetup_DsRoleGetPrimaryDomainInformation(cli, mem_ctx,
1732                                                                   DS_ROLE_BASIC_INFORMATION,
1733                                                                   &info,
1734                                                                   &werr);
1735         TALLOC_FREE(cli);
1736
1737         if (!NT_STATUS_IS_OK(result)) {
1738                 DEBUG(5, ("set_dc_type_and_flags_connect: rpccli_ds_getprimarydominfo "
1739                           "on domain %s failed: (%s)\n",
1740                           domain->name, nt_errstr(result)));
1741
1742                 /* older samba3 DCs will return DCERPC_FAULT_OP_RNG_ERROR for
1743                  * every opcode on the DSSETUP pipe, continue with
1744                  * no_dssetup mode here as well to get domain->initialized
1745                  * set - gd */
1746
1747                 if (NT_STATUS_V(result) == DCERPC_FAULT_OP_RNG_ERROR) {
1748                         goto no_dssetup;
1749                 }
1750
1751                 TALLOC_FREE(mem_ctx);
1752                 return;
1753         }
1754
1755         if ((info.basic.flags & DS_ROLE_PRIMARY_DS_RUNNING) &&
1756             !(info.basic.flags & DS_ROLE_PRIMARY_DS_MIXED_MODE)) {
1757                 domain->native_mode = True;
1758         } else {
1759                 domain->native_mode = False;
1760         }
1761
1762 no_dssetup:
1763         result = cli_rpc_pipe_open_noauth(domain->conn.cli,
1764                                           &ndr_table_lsarpc.syntax_id, &cli);
1765
1766         if (!NT_STATUS_IS_OK(result)) {
1767                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
1768                           "PI_LSARPC on domain %s: (%s)\n",
1769                           domain->name, nt_errstr(result)));
1770                 TALLOC_FREE(cli);
1771                 TALLOC_FREE(mem_ctx);
1772                 return;
1773         }
1774
1775         result = rpccli_lsa_open_policy2(cli, mem_ctx, True,
1776                                          SEC_RIGHTS_MAXIMUM_ALLOWED, &pol);
1777
1778         if (NT_STATUS_IS_OK(result)) {
1779                 /* This particular query is exactly what Win2k clients use
1780                    to determine that the DC is active directory */
1781                 result = rpccli_lsa_QueryInfoPolicy2(cli, mem_ctx,
1782                                                      &pol,
1783                                                      LSA_POLICY_INFO_DNS,
1784                                                      &lsa_info);
1785         }
1786
1787         if (NT_STATUS_IS_OK(result)) {
1788                 domain->active_directory = True;
1789
1790                 if (lsa_info->dns.name.string) {
1791                         fstrcpy(domain->name, lsa_info->dns.name.string);
1792                 }
1793
1794                 if (lsa_info->dns.dns_domain.string) {
1795                         fstrcpy(domain->alt_name,
1796                                 lsa_info->dns.dns_domain.string);
1797                 }
1798
1799                 /* See if we can set some domain trust flags about
1800                    ourself */
1801
1802                 if (lsa_info->dns.dns_forest.string) {
1803                         fstrcpy(domain->forest_name,
1804                                 lsa_info->dns.dns_forest.string);
1805
1806                         if (strequal(domain->forest_name, domain->alt_name)) {
1807                                 domain->domain_flags |= NETR_TRUST_FLAG_TREEROOT;
1808                         }
1809                 }
1810
1811                 if (lsa_info->dns.sid) {
1812                         sid_copy(&domain->sid, lsa_info->dns.sid);
1813                 }
1814         } else {
1815                 domain->active_directory = False;
1816
1817                 result = rpccli_lsa_open_policy(cli, mem_ctx, True,
1818                                                 SEC_RIGHTS_MAXIMUM_ALLOWED,
1819                                                 &pol);
1820
1821                 if (!NT_STATUS_IS_OK(result)) {
1822                         goto done;
1823                 }
1824
1825                 result = rpccli_lsa_QueryInfoPolicy(cli, mem_ctx,
1826                                                     &pol,
1827                                                     LSA_POLICY_INFO_ACCOUNT_DOMAIN,
1828                                                     &lsa_info);
1829
1830                 if (NT_STATUS_IS_OK(result)) {
1831
1832                         if (lsa_info->account_domain.name.string) {
1833                                 fstrcpy(domain->name,
1834                                         lsa_info->account_domain.name.string);
1835                         }
1836
1837                         if (lsa_info->account_domain.sid) {
1838                                 sid_copy(&domain->sid, lsa_info->account_domain.sid);
1839                         }
1840                 }
1841         }
1842 done:
1843
1844         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s is %sin native mode.\n",
1845                   domain->name, domain->native_mode ? "" : "NOT "));
1846
1847         DEBUG(5,("set_dc_type_and_flags_connect: domain %s is %srunning active directory.\n",
1848                   domain->name, domain->active_directory ? "" : "NOT "));
1849
1850         TALLOC_FREE(cli);
1851
1852         TALLOC_FREE(mem_ctx);
1853
1854         domain->initialized = True;
1855 }
1856
1857 /**********************************************************************
1858  Set the domain_flags (trust attributes, domain operating modes, etc...
1859 ***********************************************************************/
1860
1861 static void set_dc_type_and_flags( struct winbindd_domain *domain )
1862 {
1863         /* we always have to contact our primary domain */
1864
1865         if ( domain->primary ) {
1866                 DEBUG(10,("set_dc_type_and_flags: setting up flags for "
1867                           "primary domain\n"));
1868                 set_dc_type_and_flags_connect( domain );
1869                 return;
1870         }
1871
1872         /* Use our DC to get the information if possible */
1873
1874         if ( !set_dc_type_and_flags_trustinfo( domain ) ) {
1875                 /* Otherwise, fallback to contacting the
1876                    domain directly */
1877                 set_dc_type_and_flags_connect( domain );
1878         }
1879
1880         return;
1881 }
1882
1883
1884
1885 /**********************************************************************
1886 ***********************************************************************/
1887
1888 static bool cm_get_schannel_dcinfo(struct winbindd_domain *domain,
1889                                    struct dcinfo **ppdc)
1890 {
1891         NTSTATUS result;
1892         struct rpc_pipe_client *netlogon_pipe;
1893
1894         if (lp_client_schannel() == False) {
1895                 return False;
1896         }
1897
1898         result = cm_connect_netlogon(domain, &netlogon_pipe);
1899         if (!NT_STATUS_IS_OK(result)) {
1900                 return False;
1901         }
1902
1903         /* Return a pointer to the struct dcinfo from the
1904            netlogon pipe. */
1905
1906         *ppdc = domain->conn.netlogon_pipe->dc;
1907         return True;
1908 }
1909
1910 NTSTATUS cm_connect_sam(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
1911                         struct rpc_pipe_client **cli, POLICY_HND *sam_handle)
1912 {
1913         struct winbindd_cm_conn *conn;
1914         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
1915         fstring conn_pwd;
1916         struct dcinfo *p_dcinfo;
1917         char *machine_password = NULL;
1918         char *machine_account = NULL;
1919         char *domain_name = NULL;
1920
1921         result = init_dc_connection(domain);
1922         if (!NT_STATUS_IS_OK(result)) {
1923                 return result;
1924         }
1925
1926         conn = &domain->conn;
1927
1928         if (conn->samr_pipe != NULL) {
1929                 goto done;
1930         }
1931
1932         /*
1933          * No SAMR pipe yet. Attempt to get an NTLMSSP SPNEGO authenticated
1934          * sign and sealed pipe using the machine account password by
1935          * preference. If we can't - try schannel, if that fails, try
1936          * anonymous.
1937          */
1938
1939         pwd_get_cleartext(&conn->cli->pwd, conn_pwd);
1940         if ((conn->cli->user_name[0] == '\0') ||
1941             (conn->cli->domain[0] == '\0') ||
1942             (conn_pwd[0] == '\0'))
1943         {
1944                 result = get_trust_creds(domain, &machine_password,
1945                                          &machine_account, NULL);
1946                 if (!NT_STATUS_IS_OK(result)) {
1947                         DEBUG(10, ("cm_connect_sam: No no user available for "
1948                                    "domain %s, trying schannel\n", conn->cli->domain));
1949                         goto schannel;
1950                 }
1951                 domain_name = domain->name;
1952         } else {
1953                 machine_password = SMB_STRDUP(conn_pwd);
1954                 machine_account = SMB_STRDUP(conn->cli->user_name);
1955                 domain_name = conn->cli->domain;
1956         }
1957
1958         if (!machine_password || !machine_account) {
1959                 result = NT_STATUS_NO_MEMORY;
1960                 goto done;
1961         }
1962
1963         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
1964            authenticated SAMR pipe with sign & seal. */
1965         result = cli_rpc_pipe_open_spnego_ntlmssp(conn->cli,
1966                                                   &ndr_table_samr.syntax_id,
1967                                                   PIPE_AUTH_LEVEL_PRIVACY,
1968                                                   domain_name,
1969                                                   machine_account,
1970                                                   machine_password,
1971                                                   &conn->samr_pipe);
1972
1973         if (!NT_STATUS_IS_OK(result)) {
1974                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR "
1975                           "pipe for domain %s using NTLMSSP "
1976                           "authenticated pipe: user %s\\%s. Error was "
1977                           "%s\n", domain->name, domain_name,
1978                           machine_account, nt_errstr(result)));
1979                 goto schannel;
1980         }
1981
1982         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for "
1983                   "domain %s using NTLMSSP authenticated "
1984                   "pipe: user %s\\%s\n", domain->name,
1985                   domain_name, machine_account));
1986
1987         result = rpccli_samr_Connect2(conn->samr_pipe, mem_ctx,
1988                                       conn->samr_pipe->desthost,
1989                                       SEC_RIGHTS_MAXIMUM_ALLOWED,
1990                                       &conn->sam_connect_handle);
1991         if (NT_STATUS_IS_OK(result)) {
1992                 goto open_domain;
1993         }
1994         DEBUG(10,("cm_connect_sam: ntlmssp-sealed rpccli_samr_Connect2 "
1995                   "failed for domain %s, error was %s. Trying schannel\n",
1996                   domain->name, nt_errstr(result) ));
1997         TALLOC_FREE(conn->samr_pipe);
1998
1999  schannel:
2000
2001         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2002
2003         if (!cm_get_schannel_dcinfo(domain, &p_dcinfo)) {
2004                 /* If this call fails - conn->cli can now be NULL ! */
2005                 DEBUG(10, ("cm_connect_sam: Could not get schannel auth info "
2006                            "for domain %s, trying anon\n", domain->name));
2007                 goto anonymous;
2008         }
2009         result = cli_rpc_pipe_open_schannel_with_key
2010                 (conn->cli, &ndr_table_samr.syntax_id, PIPE_AUTH_LEVEL_PRIVACY,
2011                  domain->name, p_dcinfo, &conn->samr_pipe);
2012
2013         if (!NT_STATUS_IS_OK(result)) {
2014                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR pipe for "
2015                           "domain %s using schannel. Error was %s\n",
2016                           domain->name, nt_errstr(result) ));
2017                 goto anonymous;
2018         }
2019         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for domain %s using "
2020                   "schannel.\n", domain->name ));
2021
2022         result = rpccli_samr_Connect2(conn->samr_pipe, mem_ctx,
2023                                       conn->samr_pipe->desthost,
2024                                       SEC_RIGHTS_MAXIMUM_ALLOWED,
2025                                       &conn->sam_connect_handle);
2026         if (NT_STATUS_IS_OK(result)) {
2027                 goto open_domain;
2028         }
2029         DEBUG(10,("cm_connect_sam: schannel-sealed rpccli_samr_Connect2 failed "
2030                   "for domain %s, error was %s. Trying anonymous\n",
2031                   domain->name, nt_errstr(result) ));
2032         TALLOC_FREE(conn->samr_pipe);
2033
2034  anonymous:
2035
2036         /* Finally fall back to anonymous. */
2037         result = cli_rpc_pipe_open_noauth(conn->cli, &ndr_table_samr.syntax_id,
2038                                           &conn->samr_pipe);
2039
2040         if (!NT_STATUS_IS_OK(result)) {
2041                 goto done;
2042         }
2043
2044         result = rpccli_samr_Connect2(conn->samr_pipe, mem_ctx,
2045                                       conn->samr_pipe->desthost,
2046                                       SEC_RIGHTS_MAXIMUM_ALLOWED,
2047                                       &conn->sam_connect_handle);
2048         if (!NT_STATUS_IS_OK(result)) {
2049                 DEBUG(10,("cm_connect_sam: rpccli_samr_Connect2 failed "
2050                           "for domain %s Error was %s\n",
2051                           domain->name, nt_errstr(result) ));
2052                 goto done;
2053         }
2054
2055  open_domain:
2056         result = rpccli_samr_OpenDomain(conn->samr_pipe,
2057                                         mem_ctx,
2058                                         &conn->sam_connect_handle,
2059                                         SEC_RIGHTS_MAXIMUM_ALLOWED,
2060                                         &domain->sid,
2061                                         &conn->sam_domain_handle);
2062
2063  done:
2064
2065         if (!NT_STATUS_IS_OK(result)) {
2066                 invalidate_cm_connection(conn);
2067                 return result;
2068         }
2069
2070         *cli = conn->samr_pipe;
2071         *sam_handle = conn->sam_domain_handle;
2072         SAFE_FREE(machine_password);
2073         SAFE_FREE(machine_account);
2074         return result;
2075 }
2076
2077 NTSTATUS cm_connect_lsa(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2078                         struct rpc_pipe_client **cli, POLICY_HND *lsa_policy)
2079 {
2080         struct winbindd_cm_conn *conn;
2081         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2082         fstring conn_pwd;
2083         struct dcinfo *p_dcinfo;
2084
2085         result = init_dc_connection(domain);
2086         if (!NT_STATUS_IS_OK(result))
2087                 return result;
2088
2089         conn = &domain->conn;
2090
2091         if (conn->lsa_pipe != NULL) {
2092                 goto done;
2093         }
2094
2095         pwd_get_cleartext(&conn->cli->pwd, conn_pwd);
2096         if ((conn->cli->user_name[0] == '\0') ||
2097             (conn->cli->domain[0] == '\0') ||
2098             (conn_pwd[0] == '\0')) {
2099                 DEBUG(10, ("cm_connect_lsa: No no user available for "
2100                            "domain %s, trying schannel\n", conn->cli->domain));
2101                 goto schannel;
2102         }
2103
2104         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2105          * authenticated LSA pipe with sign & seal. */
2106         result = cli_rpc_pipe_open_spnego_ntlmssp
2107                 (conn->cli, &ndr_table_lsarpc.syntax_id,
2108                  PIPE_AUTH_LEVEL_PRIVACY,
2109                  conn->cli->domain, conn->cli->user_name, conn_pwd,
2110                  &conn->lsa_pipe);
2111
2112         if (!NT_STATUS_IS_OK(result)) {
2113                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2114                           "domain %s using NTLMSSP authenticated pipe: user "
2115                           "%s\\%s. Error was %s. Trying schannel.\n",
2116                           domain->name, conn->cli->domain,
2117                           conn->cli->user_name, nt_errstr(result)));
2118                 goto schannel;
2119         }
2120
2121         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2122                   "NTLMSSP authenticated pipe: user %s\\%s\n",
2123                   domain->name, conn->cli->domain, conn->cli->user_name ));
2124
2125         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2126                                         SEC_RIGHTS_MAXIMUM_ALLOWED,
2127                                         &conn->lsa_policy);
2128         if (NT_STATUS_IS_OK(result)) {
2129                 goto done;
2130         }
2131
2132         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2133                   "schannel\n"));
2134
2135         TALLOC_FREE(conn->lsa_pipe);
2136
2137  schannel:
2138
2139         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2140
2141         if (!cm_get_schannel_dcinfo(domain, &p_dcinfo)) {
2142                 /* If this call fails - conn->cli can now be NULL ! */
2143                 DEBUG(10, ("cm_connect_lsa: Could not get schannel auth info "
2144                            "for domain %s, trying anon\n", domain->name));
2145                 goto anonymous;
2146         }
2147         result = cli_rpc_pipe_open_schannel_with_key
2148                 (conn->cli, &ndr_table_lsarpc.syntax_id,
2149                  PIPE_AUTH_LEVEL_PRIVACY,
2150                  domain->name, p_dcinfo, &conn->lsa_pipe);
2151
2152         if (!NT_STATUS_IS_OK(result)) {
2153                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2154                           "domain %s using schannel. Error was %s\n",
2155                           domain->name, nt_errstr(result) ));
2156                 goto anonymous;
2157         }
2158         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2159                   "schannel.\n", domain->name ));
2160
2161         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2162                                         SEC_RIGHTS_MAXIMUM_ALLOWED,
2163                                         &conn->lsa_policy);
2164         if (NT_STATUS_IS_OK(result)) {
2165                 goto done;
2166         }
2167
2168         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2169                   "anonymous\n"));
2170
2171         TALLOC_FREE(conn->lsa_pipe);
2172
2173  anonymous:
2174
2175         result = cli_rpc_pipe_open_noauth(conn->cli,
2176                                           &ndr_table_lsarpc.syntax_id,
2177                                           &conn->lsa_pipe);
2178         if (!NT_STATUS_IS_OK(result)) {
2179                 result = NT_STATUS_PIPE_NOT_AVAILABLE;
2180                 goto done;
2181         }
2182
2183         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2184                                         SEC_RIGHTS_MAXIMUM_ALLOWED,
2185                                         &conn->lsa_policy);
2186  done:
2187         if (!NT_STATUS_IS_OK(result)) {
2188                 invalidate_cm_connection(conn);
2189                 return result;
2190         }
2191
2192         *cli = conn->lsa_pipe;
2193         *lsa_policy = conn->lsa_policy;
2194         return result;
2195 }
2196
2197 /****************************************************************************
2198  Open the netlogon pipe to this DC. Use schannel if specified in client conf.
2199  session key stored in conn->netlogon_pipe->dc->sess_key.
2200 ****************************************************************************/
2201
2202 NTSTATUS cm_connect_netlogon(struct winbindd_domain *domain,
2203                              struct rpc_pipe_client **cli)
2204 {
2205         struct winbindd_cm_conn *conn;
2206         NTSTATUS result;
2207
2208         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
2209         uint8  mach_pwd[16];
2210         uint32  sec_chan_type;
2211         const char *account_name;
2212         struct rpc_pipe_client *netlogon_pipe = NULL;
2213
2214         *cli = NULL;
2215
2216         result = init_dc_connection(domain);
2217         if (!NT_STATUS_IS_OK(result)) {
2218                 return result;
2219         }
2220
2221         conn = &domain->conn;
2222
2223         if (conn->netlogon_pipe != NULL) {
2224                 *cli = conn->netlogon_pipe;
2225                 return NT_STATUS_OK;
2226         }
2227
2228         result = cli_rpc_pipe_open_noauth(conn->cli,
2229                                           &ndr_table_netlogon.syntax_id,
2230                                           &netlogon_pipe);
2231         if (!NT_STATUS_IS_OK(result)) {
2232                 return result;
2233         }
2234
2235         if ((!IS_DC) && (!domain->primary)) {
2236                 /* Clear the schannel request bit and drop down */
2237                 neg_flags &= ~NETLOGON_NEG_SCHANNEL;
2238                 goto no_schannel;
2239         }
2240
2241         if (lp_client_schannel() != False) {
2242                 neg_flags |= NETLOGON_NEG_SCHANNEL;
2243         }
2244
2245         if (!get_trust_pw_hash(domain->name, mach_pwd, &account_name,
2246                                &sec_chan_type))
2247         {
2248                 TALLOC_FREE(netlogon_pipe);
2249                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2250         }
2251
2252         result = rpccli_netlogon_setup_creds(
2253                  netlogon_pipe,
2254                  domain->dcname, /* server name. */
2255                  domain->name,   /* domain name */
2256                  global_myname(), /* client name */
2257                  account_name,   /* machine account */
2258                  mach_pwd,       /* machine password */
2259                  sec_chan_type,  /* from get_trust_pw */
2260                  &neg_flags);
2261
2262         if (!NT_STATUS_IS_OK(result)) {
2263                 TALLOC_FREE(netlogon_pipe);
2264                 return result;
2265         }
2266
2267         if ((lp_client_schannel() == True) &&
2268                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2269                 DEBUG(3, ("Server did not offer schannel\n"));
2270                 TALLOC_FREE(netlogon_pipe);
2271                 return NT_STATUS_ACCESS_DENIED;
2272         }
2273
2274  no_schannel:
2275         if ((lp_client_schannel() == False) ||
2276                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2277                 /*
2278                  * NetSamLogonEx only works for schannel
2279                  */
2280                 domain->can_do_samlogon_ex = False;
2281
2282                 /* We're done - just keep the existing connection to NETLOGON
2283                  * open */
2284                 conn->netlogon_pipe = netlogon_pipe;
2285                 *cli = conn->netlogon_pipe;
2286                 return NT_STATUS_OK;
2287         }
2288
2289         /* Using the credentials from the first pipe, open a signed and sealed
2290            second netlogon pipe. The session key is stored in the schannel
2291            part of the new pipe auth struct.
2292         */
2293
2294         result = cli_rpc_pipe_open_schannel_with_key(
2295                 conn->cli, &ndr_table_netlogon.syntax_id,
2296                 PIPE_AUTH_LEVEL_PRIVACY, domain->name, netlogon_pipe->dc,
2297                 &conn->netlogon_pipe);
2298
2299         /* We can now close the initial netlogon pipe. */
2300         TALLOC_FREE(netlogon_pipe);
2301
2302         if (!NT_STATUS_IS_OK(result)) {
2303                 DEBUG(3, ("Could not open schannel'ed NETLOGON pipe. Error "
2304                           "was %s\n", nt_errstr(result)));
2305
2306                 /* make sure we return something besides OK */
2307                 return !NT_STATUS_IS_OK(result) ? result : NT_STATUS_PIPE_NOT_AVAILABLE;
2308         }
2309
2310         /*
2311          * Try NetSamLogonEx for AD domains
2312          */
2313         domain->can_do_samlogon_ex = domain->active_directory;
2314
2315         *cli = conn->netlogon_pipe;
2316         return NT_STATUS_OK;
2317 }