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 #include "../libcli/auth/libcli_auth.h"
  64 #include "../librpc/gen_ndr/ndr_netlogon_c.h"
  65 #include "rpc_client/cli_pipe.h"
  66 #include "rpc_client/cli_netlogon.h"
  67 #include "../librpc/gen_ndr/ndr_samr_c.h"
  68 #include "../librpc/gen_ndr/ndr_lsa_c.h"
  69 #include "rpc_client/cli_lsarpc.h"
  70 #include "../librpc/gen_ndr/ndr_dssetup_c.h"
  71 #include "libads/sitename_cache.h"
  72 #include "libsmb/clidgram.h"
  73 #include "ads.h"
  74 #include "secrets.h"
  75 #include "../libcli/security/security.h"
  76 #include "passdb.h"
  77 #include "messages.h"
  78 #include "ntdomain.h"
  79
  80 #undef DBGC_CLASS
  81 #define DBGC_CLASS DBGC_WINBIND
  82
  83 struct dc_name_ip {
  84         fstring name;
  85         struct sockaddr_storage ss;
  86 };
  87
  88 extern struct winbindd_methods reconnect_methods;
  89 extern bool override_logfile;
  90
  91 static NTSTATUS init_dc_connection_network(struct winbindd_domain *domain);
  92 static void set_dc_type_and_flags( struct winbindd_domain *domain );
  93 static bool get_dcs(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain,
  94                     struct dc_name_ip **dcs, int *num_dcs);
  95
  96 /****************************************************************
  97  Child failed to find DC's. Reschedule check.
  98 ****************************************************************/
  99
 100 static void msg_failed_to_go_online(struct messaging_context *msg,
 101                                     void *private_data,
 102                                     uint32_t msg_type,
 103                                     struct server_id server_id,
 104                                     DATA_BLOB *data)
 105 {
 106         struct winbindd_domain *domain;
 107         const char *domainname = (const char *)data->data;
 108
 109         if (data->data == NULL || data->length == 0) {
 110                 return;
 111         }
 112
 113         DEBUG(5,("msg_fail_to_go_online: received for domain %s.\n", domainname));
 114
 115         for (domain = domain_list(); domain; domain = domain->next) {
 116                 if (domain->internal) {
 117                         continue;
 118                 }
 119
 120                 if (strequal(domain->name, domainname)) {
 121                         if (domain->online) {
 122                                 /* We're already online, ignore. */
 123                                 DEBUG(5,("msg_fail_to_go_online: domain %s "
 124                                         "already online.\n", domainname));
 125                                 continue;
 126                         }
 127
 128                         /* Reschedule the online check. */
 129                         set_domain_offline(domain);
 130                         break;
 131                 }
 132         }
 133 }
 134
 135 /****************************************************************
 136  Actually cause a reconnect from a message.
 137 ****************************************************************/
 138
 139 static void msg_try_to_go_online(struct messaging_context *msg,
 140                                  void *private_data,
 141                                  uint32_t msg_type,
 142                                  struct server_id server_id,
 143                                  DATA_BLOB *data)
 144 {
 145         struct winbindd_domain *domain;
 146         const char *domainname = (const char *)data->data;
 147
 148         if (data->data == NULL || data->length == 0) {
 149                 return;
 150         }
 151
 152         DEBUG(5,("msg_try_to_go_online: received for domain %s.\n", domainname));
 153
 154         for (domain = domain_list(); domain; domain = domain->next) {
 155                 if (domain->internal) {
 156                         continue;
 157                 }
 158
 159                 if (strequal(domain->name, domainname)) {
 160
 161                         if (domain->online) {
 162                                 /* We're already online, ignore. */
 163                                 DEBUG(5,("msg_try_to_go_online: domain %s "
 164                                         "already online.\n", domainname));
 165                                 continue;
 166                         }
 167
 168                         /* This call takes care of setting the online
 169                            flag to true if we connected, or re-adding
 170                            the offline handler if false. Bypasses online
 171                            check so always does network calls. */
 172
 173                         init_dc_connection_network(domain);
 174                         break;
 175                 }
 176         }
 177 }
 178
 179 /****************************************************************
 180  Fork a child to try and contact a DC. Do this as contacting a
 181  DC requires blocking lookups and we don't want to block our
 182  parent.
 183 ****************************************************************/
 184
 185 static bool fork_child_dc_connect(struct winbindd_domain *domain)
 186 {
 187         struct dc_name_ip *dcs = NULL;
 188         int num_dcs = 0;
 189         TALLOC_CTX *mem_ctx = NULL;
 190         pid_t parent_pid = sys_getpid();
 191         char *lfile = NULL;
 192
 193         if (domain->dc_probe_pid != (pid_t)-1) {
 194                 /*
 195                  * We might already have a DC probe
 196                  * child working, check.
 197                  */
 198                 if (process_exists_by_pid(domain->dc_probe_pid)) {
 199                         DEBUG(10,("fork_child_dc_connect: pid %u already "
 200                                 "checking for DC's.\n",
 201                                 (unsigned int)domain->dc_probe_pid));
 202                         return true;
 203                 }
 204                 domain->dc_probe_pid = (pid_t)-1;
 205         }
 206
 207         domain->dc_probe_pid = sys_fork();
 208
 209         if (domain->dc_probe_pid == (pid_t)-1) {
 210                 DEBUG(0, ("fork_child_dc_connect: Could not fork: %s\n", strerror(errno)));
 211                 return False;
 212         }
 213
 214         if (domain->dc_probe_pid != (pid_t)0) {
 215                 /* Parent */
 216                 messaging_register(winbind_messaging_context(), NULL,
 217                                    MSG_WINBIND_TRY_TO_GO_ONLINE,
 218                                    msg_try_to_go_online);
 219                 messaging_register(winbind_messaging_context(), NULL,
 220                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 221                                    msg_failed_to_go_online);
 222                 return True;
 223         }
 224
 225         /* Child. */
 226
 227         /* Leave messages blocked - we will never process one. */
 228
 229         if (!override_logfile) {
 230                 if (asprintf(&lfile, "%s/log.winbindd-dc-connect", get_dyn_LOGFILEBASE()) == -1) {
 231                         DEBUG(0, ("fork_child_dc_connect: out of memory.\n"));
 232                         _exit(1);
 233                 }
 234         }
 235
 236         if (!winbindd_reinit_after_fork(lfile)) {
 237                 messaging_send_buf(winbind_messaging_context(),
 238                                    pid_to_procid(parent_pid),
 239                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 240                                    (uint8 *)domain->name,
 241                                    strlen(domain->name)+1);
 242                 _exit(1);
 243         }
 244         SAFE_FREE(lfile);
 245
 246         mem_ctx = talloc_init("fork_child_dc_connect");
 247         if (!mem_ctx) {
 248                 DEBUG(0,("talloc_init failed.\n"));
 249                 messaging_send_buf(winbind_messaging_context(),
 250                                    pid_to_procid(parent_pid),
 251                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 252                                    (uint8 *)domain->name,
 253                                    strlen(domain->name)+1);
 254                 _exit(1);
 255         }
 256
 257         if ((!get_dcs(mem_ctx, domain, &dcs, &num_dcs)) || (num_dcs == 0)) {
 258                 /* Still offline ? Can't find DC's. */
 259                 messaging_send_buf(winbind_messaging_context(),
 260                                    pid_to_procid(parent_pid),
 261                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 262                                    (uint8 *)domain->name,
 263                                    strlen(domain->name)+1);
 264                 _exit(0);
 265         }
 266
 267         /* We got a DC. Send a message to our parent to get it to
 268            try and do the same. */
 269
 270         messaging_send_buf(winbind_messaging_context(),
 271                            pid_to_procid(parent_pid),
 272                            MSG_WINBIND_TRY_TO_GO_ONLINE,
 273                            (uint8 *)domain->name,
 274                            strlen(domain->name)+1);
 275         _exit(0);
 276 }
 277
 278 /****************************************************************
 279  Handler triggered if we're offline to try and detect a DC.
 280 ****************************************************************/
 281
 282 static void check_domain_online_handler(struct event_context *ctx,
 283                                         struct timed_event *te,
 284                                         struct timeval now,
 285                                         void *private_data)
 286 {
 287         struct winbindd_domain *domain =
 288                 (struct winbindd_domain *)private_data;
 289
 290         DEBUG(10,("check_domain_online_handler: called for domain "
 291                   "%s (online = %s)\n", domain->name,
 292                   domain->online ? "True" : "False" ));
 293
 294         TALLOC_FREE(domain->check_online_event);
 295
 296         /* Are we still in "startup" mode ? */
 297
 298         if (domain->startup && (time_mono(NULL) > domain->startup_time + 30)) {
 299                 /* No longer in "startup" mode. */
 300                 DEBUG(10,("check_domain_online_handler: domain %s no longer in 'startup' mode.\n",
 301                         domain->name ));
 302                 domain->startup = False;
 303         }
 304
 305         /* We've been told to stay offline, so stay
 306            that way. */
 307
 308         if (get_global_winbindd_state_offline()) {
 309                 DEBUG(10,("check_domain_online_handler: domain %s remaining globally offline\n",
 310                         domain->name ));
 311                 return;
 312         }
 313
 314         /* Fork a child to test if it can contact a DC.
 315            If it can then send ourselves a message to
 316            cause a reconnect. */
 317
 318         fork_child_dc_connect(domain);
 319 }
 320
 321 /****************************************************************
 322  If we're still offline setup the timeout check.
 323 ****************************************************************/
 324
 325 static void calc_new_online_timeout_check(struct winbindd_domain *domain)
 326 {
 327         int wbr = lp_winbind_reconnect_delay();
 328
 329         if (domain->startup) {
 330                 domain->check_online_timeout = 10;
 331         } else if (domain->check_online_timeout < wbr) {
 332                 domain->check_online_timeout = wbr;
 333         }
 334 }
 335
 336 /****************************************************************
 337  Set domain offline and also add handler to put us back online
 338  if we detect a DC.
 339 ****************************************************************/
 340
 341 void set_domain_offline(struct winbindd_domain *domain)
 342 {
 343         DEBUG(10,("set_domain_offline: called for domain %s\n",
 344                 domain->name ));
 345
 346         TALLOC_FREE(domain->check_online_event);
 347
 348         if (domain->internal) {
 349                 DEBUG(3,("set_domain_offline: domain %s is internal - logic error.\n",
 350                         domain->name ));
 351                 return;
 352         }
 353
 354         domain->online = False;
 355
 356         /* Offline domains are always initialized. They're
 357            re-initialized when they go back online. */
 358
 359         domain->initialized = True;
 360
 361         /* We only add the timeout handler that checks and
 362            allows us to go back online when we've not
 363            been told to remain offline. */
 364
 365         if (get_global_winbindd_state_offline()) {
 366                 DEBUG(10,("set_domain_offline: domain %s remaining globally offline\n",
 367                         domain->name ));
 368                 return;
 369         }
 370
 371         /* If we're in startup mode, check again in 10 seconds, not in
 372            lp_winbind_reconnect_delay() seconds (which is 30 seconds by default). */
 373
 374         calc_new_online_timeout_check(domain);
 375
 376         domain->check_online_event = event_add_timed(winbind_event_context(),
 377                                                 NULL,
 378                                                 timeval_current_ofs(domain->check_online_timeout,0),
 379                                                 check_domain_online_handler,
 380                                                 domain);
 381
 382         /* The above *has* to succeed for winbindd to work. */
 383         if (!domain->check_online_event) {
 384                 smb_panic("set_domain_offline: failed to add online handler");
 385         }
 386
 387         DEBUG(10,("set_domain_offline: added event handler for domain %s\n",
 388                 domain->name ));
 389
 390         /* Send an offline message to the idmap child when our
 391            primary domain goes offline */
 392
 393         if ( domain->primary ) {
 394                 struct winbindd_child *idmap = idmap_child();
 395
 396                 if ( idmap->pid != 0 ) {
 397                         messaging_send_buf(winbind_messaging_context(),
 398                                            pid_to_procid(idmap->pid),
 399                                            MSG_WINBIND_OFFLINE,
 400                                            (uint8 *)domain->name,
 401                                            strlen(domain->name)+1);
 402                 }
 403         }
 404
 405         return;
 406 }
 407
 408 /****************************************************************
 409  Set domain online - if allowed.
 410 ****************************************************************/
 411
 412 static void set_domain_online(struct winbindd_domain *domain)
 413 {
 414         DEBUG(10,("set_domain_online: called for domain %s\n",
 415                 domain->name ));
 416
 417         if (domain->internal) {
 418                 DEBUG(3,("set_domain_online: domain %s is internal - logic error.\n",
 419                         domain->name ));
 420                 return;
 421         }
 422
 423         if (get_global_winbindd_state_offline()) {
 424                 DEBUG(10,("set_domain_online: domain %s remaining globally offline\n",
 425                         domain->name ));
 426                 return;
 427         }
 428
 429         winbindd_set_locator_kdc_envs(domain);
 430
 431         /* If we are waiting to get a krb5 ticket, trigger immediately. */
 432         ccache_regain_all_now();
 433
 434         /* Ok, we're out of any startup mode now... */
 435         domain->startup = False;
 436
 437         if (domain->online == False) {
 438                 /* We were offline - now we're online. We default to
 439                    using the MS-RPC backend if we started offline,
 440                    and if we're going online for the first time we
 441                    should really re-initialize the backends and the
 442                    checks to see if we're talking to an AD or NT domain.
 443                 */
 444
 445                 domain->initialized = False;
 446
 447                 /* 'reconnect_methods' is the MS-RPC backend. */
 448                 if (domain->backend == &reconnect_methods) {
 449                         domain->backend = NULL;
 450                 }
 451         }
 452
 453         /* Ensure we have no online timeout checks. */
 454         domain->check_online_timeout = 0;
 455         TALLOC_FREE(domain->check_online_event);
 456
 457         /* Ensure we ignore any pending child messages. */
 458         messaging_deregister(winbind_messaging_context(),
 459                              MSG_WINBIND_TRY_TO_GO_ONLINE, NULL);
 460         messaging_deregister(winbind_messaging_context(),
 461                              MSG_WINBIND_FAILED_TO_GO_ONLINE, NULL);
 462
 463         domain->online = True;
 464
 465         /* Send an online message to the idmap child when our
 466            primary domain comes online */
 467
 468         if ( domain->primary ) {
 469                 struct winbindd_child *idmap = idmap_child();
 470
 471                 if ( idmap->pid != 0 ) {
 472                         messaging_send_buf(winbind_messaging_context(),
 473                                            pid_to_procid(idmap->pid),
 474                                            MSG_WINBIND_ONLINE,
 475                                            (uint8 *)domain->name,
 476                                            strlen(domain->name)+1);
 477                 }
 478         }
 479
 480         return;
 481 }
 482
 483 /****************************************************************
 484  Requested to set a domain online.
 485 ****************************************************************/
 486
 487 void set_domain_online_request(struct winbindd_domain *domain)
 488 {
 489         struct timeval tev;
 490
 491         DEBUG(10,("set_domain_online_request: called for domain %s\n",
 492                 domain->name ));
 493
 494         if (get_global_winbindd_state_offline()) {
 495                 DEBUG(10,("set_domain_online_request: domain %s remaining globally offline\n",
 496                         domain->name ));
 497                 return;
 498         }
 499
 500         if (domain->internal) {
 501                 DEBUG(10, ("set_domain_online_request: Internal domains are "
 502                            "always online\n"));
 503                 return;
 504         }
 505
 506         /* We've been told it's safe to go online and
 507            try and connect to a DC. But I don't believe it
 508            because network manager seems to lie.
 509            Wait at least 5 seconds. Heuristics suck... */
 510
 511
 512         GetTimeOfDay(&tev);
 513
 514         /* Go into "startup" mode again. */
 515         domain->startup_time = time_mono(NULL);
 516         domain->startup = True;
 517
 518         tev.tv_sec += 5;
 519
 520         if (!domain->check_online_event) {
 521                 /* If we've come from being globally offline we
 522                    don't have a check online event handler set.
 523                    We need to add one now we're trying to go
 524                    back online. */
 525
 526                 DEBUG(10,("set_domain_online_request: domain %s was globally offline.\n",
 527                         domain->name ));
 528         }
 529
 530         TALLOC_FREE(domain->check_online_event);
 531
 532         domain->check_online_event = event_add_timed(winbind_event_context(),
 533                                                      NULL,
 534                                                      tev,
 535                                                      check_domain_online_handler,
 536                                                      domain);
 537
 538         /* The above *has* to succeed for winbindd to work. */
 539         if (!domain->check_online_event) {
 540                 smb_panic("set_domain_online_request: failed to add online handler");
 541         }
 542 }
 543
 544 /****************************************************************
 545  Add -ve connection cache entries for domain and realm.
 546 ****************************************************************/
 547
 548 static void winbind_add_failed_connection_entry(
 549         const struct winbindd_domain *domain,
 550         const char *server,
 551         NTSTATUS result)
 552 {
 553         add_failed_connection_entry(domain->name, server, result);
 554         /* If this was the saf name for the last thing we talked to,
 555            remove it. */
 556         saf_delete(domain->name);
 557         if (*domain->alt_name) {
 558                 add_failed_connection_entry(domain->alt_name, server, result);
 559                 saf_delete(domain->alt_name);
 560         }
 561         winbindd_unset_locator_kdc_env(domain);
 562 }
 563
 564 /* Choose between anonymous or authenticated connections.  We need to use
 565    an authenticated connection if DCs have the RestrictAnonymous registry
 566    entry set > 0, or the "Additional restrictions for anonymous
 567    connections" set in the win2k Local Security Policy.
 568
 569    Caller to free() result in domain, username, password
 570 */
 571
 572 static void cm_get_ipc_userpass(char **username, char **domain, char **password)
 573 {
 574         *username = (char *)secrets_fetch(SECRETS_AUTH_USER, NULL);
 575         *domain = (char *)secrets_fetch(SECRETS_AUTH_DOMAIN, NULL);
 576         *password = (char *)secrets_fetch(SECRETS_AUTH_PASSWORD, NULL);
 577
 578         if (*username && **username) {
 579
 580                 if (!*domain || !**domain)
 581                         *domain = smb_xstrdup(lp_workgroup());
 582
 583                 if (!*password || !**password)
 584                         *password = smb_xstrdup("");
 585
 586                 DEBUG(3, ("cm_get_ipc_userpass: Retrieved auth-user from secrets.tdb [%s\\%s]\n",
 587                           *domain, *username));
 588
 589         } else {
 590                 DEBUG(3, ("cm_get_ipc_userpass: No auth-user defined\n"));
 591                 *username = smb_xstrdup("");
 592                 *domain = smb_xstrdup("");
 593                 *password = smb_xstrdup("");
 594         }
 595 }
 596
 597 static bool get_dc_name_via_netlogon(struct winbindd_domain *domain,
 598                                      fstring dcname,
 599                                      struct sockaddr_storage *dc_ss)
 600 {
 601         struct winbindd_domain *our_domain = NULL;
 602         struct rpc_pipe_client *netlogon_pipe = NULL;
 603         NTSTATUS result;
 604         WERROR werr;
 605         TALLOC_CTX *mem_ctx;
 606         unsigned int orig_timeout;
 607         const char *tmp = NULL;
 608         const char *p;
 609         struct dcerpc_binding_handle *b;
 610
 611         /* Hmmmm. We can only open one connection to the NETLOGON pipe at the
 612          * moment.... */
 613
 614         if (IS_DC) {
 615                 return False;
 616         }
 617
 618         if (domain->primary) {
 619                 return False;
 620         }
 621
 622         our_domain = find_our_domain();
 623
 624         if ((mem_ctx = talloc_init("get_dc_name_via_netlogon")) == NULL) {
 625                 return False;
 626         }
 627
 628         result = cm_connect_netlogon(our_domain, &netlogon_pipe);
 629         if (!NT_STATUS_IS_OK(result)) {
 630                 talloc_destroy(mem_ctx);
 631                 return False;
 632         }
 633
 634         b = netlogon_pipe->binding_handle;
 635
 636         /* This call can take a long time - allow the server to time out.
 637            35 seconds should do it. */
 638
 639         orig_timeout = rpccli_set_timeout(netlogon_pipe, 35000);
 640
 641         if (our_domain->active_directory) {
 642                 struct netr_DsRGetDCNameInfo *domain_info = NULL;
 643
 644                 result = dcerpc_netr_DsRGetDCName(b,
 645                                                   mem_ctx,
 646                                                   our_domain->dcname,
 647                                                   domain->name,
 648                                                   NULL,
 649                                                   NULL,
 650                                                   DS_RETURN_DNS_NAME,
 651                                                   &domain_info,
 652                                                   &werr);
 653                 if (NT_STATUS_IS_OK(result) && W_ERROR_IS_OK(werr)) {
 654                         tmp = talloc_strdup(
 655                                 mem_ctx, domain_info->dc_unc);
 656                         if (tmp == NULL) {
 657                                 DEBUG(0, ("talloc_strdup failed\n"));
 658                                 talloc_destroy(mem_ctx);
 659                                 return false;
 660                         }
 661                         if (strlen(domain->alt_name) == 0) {
 662                                 fstrcpy(domain->alt_name,
 663                                         domain_info->domain_name);
 664                         }
 665                         if (strlen(domain->forest_name) == 0) {
 666                                 fstrcpy(domain->forest_name,
 667                                         domain_info->forest_name);
 668                         }
 669                 }
 670         } else {
 671                 result = dcerpc_netr_GetAnyDCName(b, mem_ctx,
 672                                                   our_domain->dcname,
 673                                                   domain->name,
 674                                                   &tmp,
 675                                                   &werr);
 676         }
 677
 678         /* And restore our original timeout. */
 679         rpccli_set_timeout(netlogon_pipe, orig_timeout);
 680
 681         if (!NT_STATUS_IS_OK(result)) {
 682                 DEBUG(10,("dcerpc_netr_GetAnyDCName failed: %s\n",
 683                         nt_errstr(result)));
 684                 talloc_destroy(mem_ctx);
 685                 return false;
 686         }
 687
 688         if (!W_ERROR_IS_OK(werr)) {
 689                 DEBUG(10,("dcerpc_netr_GetAnyDCName failed: %s\n",
 690                            win_errstr(werr)));
 691                 talloc_destroy(mem_ctx);
 692                 return false;
 693         }
 694
 695         /* dcerpc_netr_GetAnyDCName gives us a name with \\ */
 696         p = strip_hostname(tmp);
 697
 698         fstrcpy(dcname, p);
 699
 700         talloc_destroy(mem_ctx);
 701
 702         DEBUG(10,("dcerpc_netr_GetAnyDCName returned %s\n", dcname));
 703
 704         if (!resolve_name(dcname, dc_ss, 0x20, true)) {
 705                 return False;
 706         }
 707
 708         return True;
 709 }
 710
 711 /**
 712  * Helper function to assemble trust password and account name
 713  */
 714 static NTSTATUS get_trust_creds(const struct winbindd_domain *domain,
 715                                 char **machine_password,
 716                                 char **machine_account,
 717                                 char **machine_krb5_principal)
 718 {
 719         const char *account_name;
 720         const char *name = NULL;
 721
 722         /* If we are a DC and this is not our own domain */
 723
 724         if (IS_DC) {
 725                 name = domain->name;
 726         } else {
 727                 struct winbindd_domain *our_domain = find_our_domain();
 728
 729                 if (!our_domain)
 730                         return NT_STATUS_INVALID_SERVER_STATE;
 731
 732                 name = our_domain->name;
 733         }
 734
 735         if (!get_trust_pw_clear(name, machine_password,
 736                                 &account_name, NULL))
 737         {
 738                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 739         }
 740
 741         if ((machine_account != NULL) &&
 742             (asprintf(machine_account, "%s$", account_name) == -1))
 743         {
 744                 return NT_STATUS_NO_MEMORY;
 745         }
 746
 747         /* For now assume our machine account only exists in our domain */
 748
 749         if (machine_krb5_principal != NULL)
 750         {
 751                 struct winbindd_domain *our_domain = find_our_domain();
 752
 753                 if (!our_domain) {
 754                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 755                 }
 756
 757                 if (asprintf(machine_krb5_principal, "%s$@%s",
 758                              account_name, our_domain->alt_name) == -1)
 759                 {
 760                         return NT_STATUS_NO_MEMORY;
 761                 }
 762
 763                 strupper_m(*machine_krb5_principal);
 764         }
 765
 766         return NT_STATUS_OK;
 767 }
 768
 769 /************************************************************************
 770  Given a fd with a just-connected TCP connection to a DC, open a connection
 771  to the pipe.
 772 ************************************************************************/
 773
 774 static NTSTATUS cm_prepare_connection(const struct winbindd_domain *domain,
 775                                       const int sockfd,
 776                                       const char *controller,
 777                                       struct cli_state **cli,
 778                                       bool *retry)
 779 {
 780         char *machine_password = NULL;
 781         char *machine_krb5_principal = NULL;
 782         char *machine_account = NULL;
 783         char *ipc_username = NULL;
 784         char *ipc_domain = NULL;
 785         char *ipc_password = NULL;
 786
 787         struct named_mutex *mutex;
 788
 789         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
 790
 791         struct sockaddr peeraddr;
 792         socklen_t peeraddr_len;
 793
 794         struct sockaddr_in *peeraddr_in =
 795                 (struct sockaddr_in *)(void *)&peeraddr;
 796
 797         DEBUG(10,("cm_prepare_connection: connecting to DC %s for domain %s\n",
 798                 controller, domain->name ));
 799
 800         *retry = True;
 801
 802         mutex = grab_named_mutex(talloc_tos(), controller,
 803                                  WINBIND_SERVER_MUTEX_WAIT_TIME);
 804         if (mutex == NULL) {
 805                 DEBUG(0,("cm_prepare_connection: mutex grab failed for %s\n",
 806                          controller));
 807                 result = NT_STATUS_POSSIBLE_DEADLOCK;
 808                 goto done;
 809         }
 810
 811         if ((*cli = cli_initialise()) == NULL) {
 812                 DEBUG(1, ("Could not cli_initialize\n"));
 813                 result = NT_STATUS_NO_MEMORY;
 814                 goto done;
 815         }
 816
 817         (*cli)->timeout = 10000;        /* 10 seconds */
 818         (*cli)->fd = sockfd;
 819         (*cli)->desthost = talloc_strdup((*cli), controller);
 820         if ((*cli)->desthost == NULL) {
 821                 result = NT_STATUS_NO_MEMORY;
 822                 goto done;
 823         }
 824
 825         (*cli)->use_kerberos = True;
 826
 827         peeraddr_len = sizeof(peeraddr);
 828
 829         if ((getpeername((*cli)->fd, &peeraddr, &peeraddr_len) != 0)) {
 830                 DEBUG(0,("cm_prepare_connection: getpeername failed with: %s\n",
 831                         strerror(errno)));
 832                 result = NT_STATUS_UNSUCCESSFUL;
 833                 goto done;
 834         }
 835
 836         if ((peeraddr_len != sizeof(struct sockaddr_in))
 837 #ifdef HAVE_IPV6
 838             && (peeraddr_len != sizeof(struct sockaddr_in6))
 839 #endif
 840             ) {
 841                 DEBUG(0,("cm_prepare_connection: got unexpected peeraddr len %d\n",
 842                         peeraddr_len));
 843                 result = NT_STATUS_UNSUCCESSFUL;
 844                 goto done;
 845         }
 846
 847         if ((peeraddr_in->sin_family != PF_INET)
 848 #ifdef HAVE_IPV6
 849             && (peeraddr_in->sin_family != PF_INET6)
 850 #endif
 851             ) {
 852                 DEBUG(0,("cm_prepare_connection: got unexpected family %d\n",
 853                         peeraddr_in->sin_family));
 854                 result = NT_STATUS_UNSUCCESSFUL;
 855                 goto done;
 856         }
 857
 858         result = cli_negprot(*cli);
 859
 860         if (!NT_STATUS_IS_OK(result)) {
 861                 DEBUG(1, ("cli_negprot failed: %s\n", nt_errstr(result)));
 862                 goto done;
 863         }
 864
 865         if (!is_dc_trusted_domain_situation(domain->name) &&
 866             (*cli)->protocol >= PROTOCOL_NT1 &&
 867             (*cli)->capabilities & CAP_EXTENDED_SECURITY)
 868         {
 869                 ADS_STATUS ads_status;
 870
 871                 result = get_trust_creds(domain, &machine_password,
 872                                          &machine_account,
 873                                          &machine_krb5_principal);
 874                 if (!NT_STATUS_IS_OK(result)) {
 875                         goto anon_fallback;
 876                 }
 877
 878                 if (lp_security() == SEC_ADS) {
 879
 880                         /* Try a krb5 session */
 881
 882                         (*cli)->use_kerberos = True;
 883                         DEBUG(5, ("connecting to %s from %s with kerberos principal "
 884                                   "[%s] and realm [%s]\n", controller, global_myname(),
 885                                   machine_krb5_principal, domain->alt_name));
 886
 887                         winbindd_set_locator_kdc_envs(domain);
 888
 889                         ads_status = cli_session_setup_spnego(*cli,
 890                                                               machine_krb5_principal,
 891                                                               machine_password,
 892                                                               lp_workgroup(),
 893                                                               domain->alt_name);
 894
 895                         if (!ADS_ERR_OK(ads_status)) {
 896                                 DEBUG(4,("failed kerberos session setup with %s\n",
 897                                          ads_errstr(ads_status)));
 898                         }
 899
 900                         result = ads_ntstatus(ads_status);
 901                         if (NT_STATUS_IS_OK(result)) {
 902                                 /* Ensure creds are stored for NTLMSSP authenticated pipe access. */
 903                                 result = cli_init_creds(*cli, machine_account, lp_workgroup(), machine_password);
 904                                 if (!NT_STATUS_IS_OK(result)) {
 905                                         goto done;
 906                                 }
 907                                 goto session_setup_done;
 908                         }
 909                 }
 910
 911                 /* Fall back to non-kerberos session setup using NTLMSSP SPNEGO with the machine account. */
 912                 (*cli)->use_kerberos = False;
 913
 914                 DEBUG(5, ("connecting to %s from %s with username "
 915                           "[%s]\\[%s]\n",  controller, global_myname(),
 916                           lp_workgroup(), machine_account));
 917
 918                 ads_status = cli_session_setup_spnego(*cli,
 919                                                       machine_account,
 920                                                       machine_password,
 921                                                       lp_workgroup(),
 922                                                       NULL);
 923                 if (!ADS_ERR_OK(ads_status)) {
 924                         DEBUG(4, ("authenticated session setup failed with %s\n",
 925                                 ads_errstr(ads_status)));
 926                 }
 927
 928                 result = ads_ntstatus(ads_status);
 929                 if (NT_STATUS_IS_OK(result)) {
 930                         /* Ensure creds are stored for NTLMSSP authenticated pipe access. */
 931                         result = cli_init_creds(*cli, machine_account, lp_workgroup(), machine_password);
 932                         if (!NT_STATUS_IS_OK(result)) {
 933                                 goto done;
 934                         }
 935                         goto session_setup_done;
 936                 }
 937         }
 938
 939         /* Fall back to non-kerberos session setup with auth_user */
 940
 941         (*cli)->use_kerberos = False;
 942
 943         cm_get_ipc_userpass(&ipc_username, &ipc_domain, &ipc_password);
 944
 945         if ((((*cli)->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) != 0) &&
 946             (strlen(ipc_username) > 0)) {
 947
 948                 /* Only try authenticated if we have a username */
 949
 950                 DEBUG(5, ("connecting to %s from %s with username "
 951                           "[%s]\\[%s]\n",  controller, global_myname(),
 952                           ipc_domain, ipc_username));
 953
 954                 if (NT_STATUS_IS_OK(cli_session_setup(
 955                                             *cli, ipc_username,
 956                                             ipc_password, strlen(ipc_password)+1,
 957                                             ipc_password, strlen(ipc_password)+1,
 958                                             ipc_domain))) {
 959                         /* Successful logon with given username. */
 960                         result = cli_init_creds(*cli, ipc_username, ipc_domain, ipc_password);
 961                         if (!NT_STATUS_IS_OK(result)) {
 962                                 goto done;
 963                         }
 964                         goto session_setup_done;
 965                 } else {
 966                         DEBUG(4, ("authenticated session setup with user %s\\%s failed.\n",
 967                                 ipc_domain, ipc_username ));
 968                 }
 969         }
 970
 971  anon_fallback:
 972
 973         /* Fall back to anonymous connection, this might fail later */
 974         DEBUG(10,("cm_prepare_connection: falling back to anonymous "
 975                 "connection for DC %s\n",
 976                 controller ));
 977
 978         if (NT_STATUS_IS_OK(cli_session_setup(*cli, "", NULL, 0,
 979                                               NULL, 0, ""))) {
 980                 DEBUG(5, ("Connected anonymously\n"));
 981                 result = cli_init_creds(*cli, "", "", "");
 982                 if (!NT_STATUS_IS_OK(result)) {
 983                         goto done;
 984                 }
 985                 goto session_setup_done;
 986         }
 987
 988         result = cli_nt_error(*cli);
 989
 990         if (NT_STATUS_IS_OK(result))
 991                 result = NT_STATUS_UNSUCCESSFUL;
 992
 993         /* We can't session setup */
 994
 995         goto done;
 996
 997  session_setup_done:
 998
 999         /* cache the server name for later connections */
1000
1001         saf_store( domain->name, (*cli)->desthost );
1002         if (domain->alt_name && (*cli)->use_kerberos) {
1003                 saf_store( domain->alt_name, (*cli)->desthost );
1004         }
1005
1006         winbindd_set_locator_kdc_envs(domain);
1007
1008         result = cli_tcon_andx(*cli, "IPC$", "IPC", "", 0);
1009
1010         if (!NT_STATUS_IS_OK(result)) {
1011                 DEBUG(1,("failed tcon_X with %s\n", nt_errstr(result)));
1012                 goto done;
1013         }
1014
1015         TALLOC_FREE(mutex);
1016         *retry = False;
1017
1018         /* set the domain if empty; needed for schannel connections */
1019         if ( !(*cli)->domain[0] ) {
1020                 result = cli_set_domain((*cli), domain->name);
1021                 if (!NT_STATUS_IS_OK(result)) {
1022                         return result;
1023                 }
1024         }
1025
1026         result = NT_STATUS_OK;
1027
1028  done:
1029         TALLOC_FREE(mutex);
1030         SAFE_FREE(machine_account);
1031         SAFE_FREE(machine_password);
1032         SAFE_FREE(machine_krb5_principal);
1033         SAFE_FREE(ipc_username);
1034         SAFE_FREE(ipc_domain);
1035         SAFE_FREE(ipc_password);
1036
1037         if (!NT_STATUS_IS_OK(result)) {
1038                 winbind_add_failed_connection_entry(domain, controller, result);
1039                 if ((*cli) != NULL) {
1040                         cli_shutdown(*cli);
1041                         *cli = NULL;
1042                 }
1043         }
1044
1045         return result;
1046 }
1047
1048 /*******************************************************************
1049  Add a dcname and sockaddr_storage pair to the end of a dc_name_ip
1050  array.
1051
1052  Keeps the list unique by not adding duplicate entries.
1053
1054  @param[in] mem_ctx talloc memory context to allocate from
1055  @param[in] domain_name domain of the DC
1056  @param[in] dcname name of the DC to add to the list
1057  @param[in] pss Internet address and port pair to add to the list
1058  @param[in,out] dcs array of dc_name_ip structures to add to
1059  @param[in,out] num_dcs number of dcs returned in the dcs array
1060  @return true if the list was added to, false otherwise
1061 *******************************************************************/
1062
1063 static bool add_one_dc_unique(TALLOC_CTX *mem_ctx, const char *domain_name,
1064                               const char *dcname, struct sockaddr_storage *pss,
1065                               struct dc_name_ip **dcs, int *num)
1066 {
1067         int i = 0;
1068
1069         if (!NT_STATUS_IS_OK(check_negative_conn_cache(domain_name, dcname))) {
1070                 DEBUG(10, ("DC %s was in the negative conn cache\n", dcname));
1071                 return False;
1072         }
1073
1074         /* Make sure there's no duplicates in the list */
1075         for (i=0; i<*num; i++)
1076                 if (sockaddr_equal(
1077                             (struct sockaddr *)(void *)&(*dcs)[i].ss,
1078                             (struct sockaddr *)(void *)pss))
1079                         return False;
1080
1081         *dcs = TALLOC_REALLOC_ARRAY(mem_ctx, *dcs, struct dc_name_ip, (*num)+1);
1082
1083         if (*dcs == NULL)
1084                 return False;
1085
1086         fstrcpy((*dcs)[*num].name, dcname);
1087         (*dcs)[*num].ss = *pss;
1088         *num += 1;
1089         return True;
1090 }
1091
1092 static bool add_sockaddr_to_array(TALLOC_CTX *mem_ctx,
1093                                   struct sockaddr_storage *pss, uint16 port,
1094                                   struct sockaddr_storage **addrs, int *num)
1095 {
1096         *addrs = TALLOC_REALLOC_ARRAY(mem_ctx, *addrs, struct sockaddr_storage, (*num)+1);
1097
1098         if (*addrs == NULL) {
1099                 *num = 0;
1100                 return False;
1101         }
1102
1103         (*addrs)[*num] = *pss;
1104         set_sockaddr_port((struct sockaddr *)&(*addrs)[*num], port);
1105
1106         *num += 1;
1107         return True;
1108 }
1109
1110 /*******************************************************************
1111  convert an ip to a name
1112 *******************************************************************/
1113
1114 static bool dcip_to_name(TALLOC_CTX *mem_ctx,
1115                 const struct winbindd_domain *domain,
1116                 struct sockaddr_storage *pss,
1117                 fstring name )
1118 {
1119         struct ip_service ip_list;
1120         uint32_t nt_version = NETLOGON_NT_VERSION_1;
1121         NTSTATUS status;
1122         const char *dc_name;
1123
1124         ip_list.ss = *pss;
1125         ip_list.port = 0;
1126
1127 #ifdef HAVE_ADS
1128         /* For active directory servers, try to get the ldap server name.
1129            None of these failures should be considered critical for now */
1130
1131         if (lp_security() == SEC_ADS) {
1132                 ADS_STRUCT *ads;
1133                 ADS_STATUS ads_status;
1134                 char addr[INET6_ADDRSTRLEN];
1135
1136                 print_sockaddr(addr, sizeof(addr), pss);
1137
1138                 ads = ads_init(domain->alt_name, domain->name, addr);
1139                 ads->auth.flags |= ADS_AUTH_NO_BIND;
1140
1141                 ads_status = ads_connect(ads);
1142                 if (ADS_ERR_OK(ads_status)) {
1143                         /* We got a cldap packet. */
1144                         fstrcpy(name, ads->config.ldap_server_name);
1145                         namecache_store(name, 0x20, 1, &ip_list);
1146
1147                         DEBUG(10,("dcip_to_name: flags = 0x%x\n", (unsigned int)ads->config.flags));
1148
1149                         if (domain->primary && (ads->config.flags & NBT_SERVER_KDC)) {
1150                                 if (ads_closest_dc(ads)) {
1151                                         char *sitename = sitename_fetch(ads->config.realm);
1152
1153                                         /* We're going to use this KDC for this realm/domain.
1154                                            If we are using sites, then force the krb5 libs
1155                                            to use this KDC. */
1156
1157                                         create_local_private_krb5_conf_for_domain(domain->alt_name,
1158                                                                         domain->name,
1159                                                                         sitename,
1160                                                                         pss,
1161                                                                         name);
1162
1163                                         SAFE_FREE(sitename);
1164                                 } else {
1165                                         /* use an off site KDC */
1166                                         create_local_private_krb5_conf_for_domain(domain->alt_name,
1167                                                                         domain->name,
1168                                                                         NULL,
1169                                                                         pss,
1170                                                                         name);
1171                                 }
1172                                 winbindd_set_locator_kdc_envs(domain);
1173
1174                                 /* Ensure we contact this DC also. */
1175                                 saf_store( domain->name, name);
1176                                 saf_store( domain->alt_name, name);
1177                         }
1178
1179                         ads_destroy( &ads );
1180                         return True;
1181                 }
1182
1183                 ads_destroy( &ads );
1184         }
1185 #endif
1186
1187         status = nbt_getdc(winbind_messaging_context(), pss, domain->name,
1188                            &domain->sid, nt_version, mem_ctx, &nt_version,
1189                            &dc_name, NULL);
1190         if (NT_STATUS_IS_OK(status)) {
1191                 fstrcpy(name, dc_name);
1192                 namecache_store(name, 0x20, 1, &ip_list);
1193                 return True;
1194         }
1195
1196         /* try node status request */
1197
1198         if ( name_status_find(domain->name, 0x1c, 0x20, pss, name) ) {
1199                 namecache_store(name, 0x20, 1, &ip_list);
1200                 return True;
1201         }
1202         return False;
1203 }
1204
1205 /*******************************************************************
1206  Retrieve a list of IP addresses for domain controllers.
1207
1208  The array is sorted in the preferred connection order.
1209
1210  @param[in] mem_ctx talloc memory context to allocate from
1211  @param[in] domain domain to retrieve DCs for
1212  @param[out] dcs array of dcs that will be returned
1213  @param[out] num_dcs number of dcs returned in the dcs array
1214  @return always true
1215 *******************************************************************/
1216
1217 static bool get_dcs(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain,
1218                     struct dc_name_ip **dcs, int *num_dcs)
1219 {
1220         fstring dcname;
1221         struct  sockaddr_storage ss;
1222         struct  ip_service *ip_list = NULL;
1223         int     iplist_size = 0;
1224         int     i;
1225         bool    is_our_domain;
1226         enum security_types sec = (enum security_types)lp_security();
1227
1228         is_our_domain = strequal(domain->name, lp_workgroup());
1229
1230         /* If not our domain, get the preferred DC, by asking our primary DC */
1231         if ( !is_our_domain
1232                 && get_dc_name_via_netlogon(domain, dcname, &ss)
1233                 && add_one_dc_unique(mem_ctx, domain->name, dcname, &ss, dcs,
1234                        num_dcs) )
1235         {
1236                 char addr[INET6_ADDRSTRLEN];
1237                 print_sockaddr(addr, sizeof(addr), &ss);
1238                 DEBUG(10, ("Retrieved DC %s at %s via netlogon\n",
1239                            dcname, addr));
1240                 return True;
1241         }
1242
1243         if (sec == SEC_ADS) {
1244                 char *sitename = NULL;
1245
1246                 /* We need to make sure we know the local site before
1247                    doing any DNS queries, as this will restrict the
1248                    get_sorted_dc_list() call below to only fetching
1249                    DNS records for the correct site. */
1250
1251                 /* Find any DC to get the site record.
1252                    We deliberately don't care about the
1253                    return here. */
1254
1255                 get_dc_name(domain->name, domain->alt_name, dcname, &ss);
1256
1257                 sitename = sitename_fetch(domain->alt_name);
1258                 if (sitename) {
1259
1260                         /* Do the site-specific AD dns lookup first. */
1261                         get_sorted_dc_list(domain->alt_name, sitename, &ip_list,
1262                                &iplist_size, True);
1263
1264                         /* Add ips to the DC array.  We don't look up the name
1265                            of the DC in this function, but we fill in the char*
1266                            of the ip now to make the failed connection cache
1267                            work */
1268                         for ( i=0; i<iplist_size; i++ ) {
1269                                 char addr[INET6_ADDRSTRLEN];
1270                                 print_sockaddr(addr, sizeof(addr),
1271                                                 &ip_list[i].ss);
1272                                 add_one_dc_unique(mem_ctx,
1273                                                 domain->name,
1274                                                 addr,
1275                                                 &ip_list[i].ss,
1276                                                 dcs,
1277                                                 num_dcs);
1278                         }
1279
1280                         SAFE_FREE(ip_list);
1281                         SAFE_FREE(sitename);
1282                         iplist_size = 0;
1283                 }
1284
1285                 /* Now we add DCs from the main AD DNS lookup. */
1286                 get_sorted_dc_list(domain->alt_name, NULL, &ip_list,
1287                         &iplist_size, True);
1288
1289                 for ( i=0; i<iplist_size; i++ ) {
1290                         char addr[INET6_ADDRSTRLEN];
1291                         print_sockaddr(addr, sizeof(addr),
1292                                         &ip_list[i].ss);
1293                         add_one_dc_unique(mem_ctx,
1294                                         domain->name,
1295                                         addr,
1296                                         &ip_list[i].ss,
1297                                         dcs,
1298                                         num_dcs);
1299                 }
1300
1301                 SAFE_FREE(ip_list);
1302                 iplist_size = 0;
1303         }
1304
1305         /* Try standard netbios queries if no ADS */
1306         if (*num_dcs == 0) {
1307                 get_sorted_dc_list(domain->name, NULL, &ip_list, &iplist_size,
1308                        False);
1309
1310                 for ( i=0; i<iplist_size; i++ ) {
1311                         char addr[INET6_ADDRSTRLEN];
1312                         print_sockaddr(addr, sizeof(addr),
1313                                         &ip_list[i].ss);
1314                         add_one_dc_unique(mem_ctx,
1315                                         domain->name,
1316                                         addr,
1317                                         &ip_list[i].ss,
1318                                         dcs,
1319                                         num_dcs);
1320                 }
1321
1322                 SAFE_FREE(ip_list);
1323                 iplist_size = 0;
1324         }
1325
1326         return True;
1327 }
1328
1329 /*******************************************************************
1330  Find and make a connection to a DC in the given domain.
1331
1332  @param[in] mem_ctx talloc memory context to allocate from
1333  @param[in] domain domain to find a dc in
1334  @param[out] dcname NetBIOS or FQDN of DC that's connected to
1335  @param[out] pss DC Internet address and port
1336  @param[out] fd fd of the open socket connected to the newly found dc
1337  @return true when a DC connection is made, false otherwise
1338 *******************************************************************/
1339
1340 static bool find_new_dc(TALLOC_CTX *mem_ctx,
1341                         struct winbindd_domain *domain,
1342                         fstring dcname, struct sockaddr_storage *pss, int *fd)
1343 {
1344         struct dc_name_ip *dcs = NULL;
1345         int num_dcs = 0;
1346
1347         const char **dcnames = NULL;
1348         int num_dcnames = 0;
1349
1350         struct sockaddr_storage *addrs = NULL;
1351         int num_addrs = 0;
1352
1353         int i;
1354         size_t fd_index;
1355
1356         NTSTATUS status;
1357
1358         *fd = -1;
1359
1360  again:
1361         if (!get_dcs(mem_ctx, domain, &dcs, &num_dcs) || (num_dcs == 0))
1362                 return False;
1363
1364         for (i=0; i<num_dcs; i++) {
1365
1366                 if (!add_string_to_array(mem_ctx, dcs[i].name,
1367                                     &dcnames, &num_dcnames)) {
1368                         return False;
1369                 }
1370                 if (!add_sockaddr_to_array(mem_ctx, &dcs[i].ss, 445,
1371                                       &addrs, &num_addrs)) {
1372                         return False;
1373                 }
1374         }
1375
1376         if ((num_dcnames == 0) || (num_dcnames != num_addrs))
1377                 return False;
1378
1379         if ((addrs == NULL) || (dcnames == NULL))
1380                 return False;
1381
1382         status = smbsock_any_connect(addrs, dcnames, NULL, NULL, NULL,
1383                                      num_addrs, 0, 10, fd, &fd_index, NULL);
1384         if (!NT_STATUS_IS_OK(status)) {
1385                 for (i=0; i<num_dcs; i++) {
1386                         char ab[INET6_ADDRSTRLEN];
1387                         print_sockaddr(ab, sizeof(ab), &dcs[i].ss);
1388                         DEBUG(10, ("find_new_dc: smbsock_any_connect failed for "
1389                                 "domain %s address %s. Error was %s\n",
1390                                    domain->name, ab, nt_errstr(status) ));
1391                         winbind_add_failed_connection_entry(domain,
1392                                 dcs[i].name, NT_STATUS_UNSUCCESSFUL);
1393                 }
1394                 return False;
1395         }
1396
1397         *pss = addrs[fd_index];
1398
1399         if (*dcnames[fd_index] != '\0' && !is_ipaddress(dcnames[fd_index])) {
1400                 /* Ok, we've got a name for the DC */
1401                 fstrcpy(dcname, dcnames[fd_index]);
1402                 return True;
1403         }
1404
1405         /* Try to figure out the name */
1406         if (dcip_to_name(mem_ctx, domain, pss, dcname)) {
1407                 return True;
1408         }
1409
1410         /* We can not continue without the DC's name */
1411         winbind_add_failed_connection_entry(domain, dcs[fd_index].name,
1412                                     NT_STATUS_UNSUCCESSFUL);
1413
1414         /* Throw away all arrays as we're doing this again. */
1415         TALLOC_FREE(dcs);
1416         num_dcs = 0;
1417
1418         TALLOC_FREE(dcnames);
1419         num_dcnames = 0;
1420
1421         TALLOC_FREE(addrs);
1422         num_addrs = 0;
1423
1424         close(*fd);
1425         *fd = -1;
1426
1427         goto again;
1428 }
1429
1430 static char *current_dc_key(TALLOC_CTX *mem_ctx, const char *domain_name)
1431 {
1432         return talloc_asprintf_strupper_m(mem_ctx, "CURRENT_DCNAME/%s",
1433                                           domain_name);
1434 }
1435
1436 static void store_current_dc_in_gencache(const char *domain_name,
1437                                          const char *dc_name,
1438                                          struct cli_state *cli)
1439 {
1440         char addr[INET6_ADDRSTRLEN];
1441         char *key = NULL;
1442         char *value = NULL;
1443
1444         if (cli == NULL) {
1445                 return;
1446         }
1447         if (cli->fd == -1) {
1448                 return;
1449         }
1450         get_peer_addr(cli->fd, addr, sizeof(addr));
1451
1452         key = current_dc_key(talloc_tos(), domain_name);
1453         if (key == NULL) {
1454                 goto done;
1455         }
1456
1457         value = talloc_asprintf(talloc_tos(), "%s %s", addr, dc_name);
1458         if (value == NULL) {
1459                 goto done;
1460         }
1461
1462         gencache_set(key, value, 0x7fffffff);
1463 done:
1464         TALLOC_FREE(value);
1465         TALLOC_FREE(key);
1466 }
1467
1468 bool fetch_current_dc_from_gencache(TALLOC_CTX *mem_ctx,
1469                                     const char *domain_name,
1470                                     char **p_dc_name, char **p_dc_ip)
1471 {
1472         char *key, *value, *p;
1473         bool ret = false;
1474         char *dc_name = NULL;
1475         char *dc_ip = NULL;
1476
1477         key = current_dc_key(talloc_tos(), domain_name);
1478         if (key == NULL) {
1479                 goto done;
1480         }
1481         if (!gencache_get(key, &value, NULL)) {
1482                 goto done;
1483         }
1484         p = strchr(value, ' ');
1485         if (p == NULL) {
1486                 goto done;
1487         }
1488         dc_ip = talloc_strndup(mem_ctx, value, p - value);
1489         if (dc_ip == NULL) {
1490                 goto done;
1491         }
1492         dc_name = talloc_strdup(mem_ctx, p+1);
1493         if (dc_name == NULL) {
1494                 goto done;
1495         }
1496
1497         if (p_dc_ip != NULL) {
1498                 *p_dc_ip = dc_ip;
1499                 dc_ip = NULL;
1500         }
1501         if (p_dc_name != NULL) {
1502                 *p_dc_name = dc_name;
1503                 dc_name = NULL;
1504         }
1505         ret = true;
1506 done:
1507         TALLOC_FREE(dc_name);
1508         TALLOC_FREE(dc_ip);
1509         TALLOC_FREE(key);
1510         return ret;
1511 }
1512
1513 static NTSTATUS cm_open_connection(struct winbindd_domain *domain,
1514                                    struct winbindd_cm_conn *new_conn)
1515 {
1516         TALLOC_CTX *mem_ctx;
1517         NTSTATUS result;
1518         char *saf_servername = saf_fetch( domain->name );
1519         int retries;
1520
1521         if ((mem_ctx = talloc_init("cm_open_connection")) == NULL) {
1522                 SAFE_FREE(saf_servername);
1523                 set_domain_offline(domain);
1524                 return NT_STATUS_NO_MEMORY;
1525         }
1526
1527         /* we have to check the server affinity cache here since
1528            later we select a DC based on response time and not preference */
1529
1530         /* Check the negative connection cache
1531            before talking to it. It going down may have
1532            triggered the reconnection. */
1533
1534         if ( saf_servername && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, saf_servername))) {
1535
1536                 DEBUG(10,("cm_open_connection: saf_servername is '%s' for domain %s\n",
1537                         saf_servername, domain->name ));
1538
1539                 /* convert an ip address to a name */
1540                 if (is_ipaddress( saf_servername ) ) {
1541                         fstring saf_name;
1542                         struct sockaddr_storage ss;
1543
1544                         if (!interpret_string_addr(&ss, saf_servername,
1545                                                 AI_NUMERICHOST)) {
1546                                 return NT_STATUS_UNSUCCESSFUL;
1547                         }
1548                         if (dcip_to_name(mem_ctx, domain, &ss, saf_name )) {
1549                                 fstrcpy( domain->dcname, saf_name );
1550                         } else {
1551                                 winbind_add_failed_connection_entry(
1552                                         domain, saf_servername,
1553                                         NT_STATUS_UNSUCCESSFUL);
1554                         }
1555                 } else {
1556                         fstrcpy( domain->dcname, saf_servername );
1557                 }
1558
1559                 SAFE_FREE( saf_servername );
1560         }
1561
1562         for (retries = 0; retries < 3; retries++) {
1563                 int fd = -1;
1564                 bool retry = False;
1565
1566                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1567
1568                 DEBUG(10,("cm_open_connection: dcname is '%s' for domain %s\n",
1569                         domain->dcname, domain->name ));
1570
1571                 if (*domain->dcname
1572                         && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, domain->dcname))
1573                         && (resolve_name(domain->dcname, &domain->dcaddr, 0x20, true)))
1574                 {
1575                         NTSTATUS status;
1576
1577                         status = smbsock_connect(&domain->dcaddr, 0,
1578                                                  NULL, -1, NULL, -1,
1579                                                  &fd, NULL, 10);
1580                         if (!NT_STATUS_IS_OK(status)) {
1581                                 fd = -1;
1582                         }
1583                 }
1584
1585                 if ((fd == -1)
1586                         && !find_new_dc(mem_ctx, domain, domain->dcname, &domain->dcaddr, &fd))
1587                 {
1588                         /* This is the one place where we will
1589                            set the global winbindd offline state
1590                            to true, if a "WINBINDD_OFFLINE" entry
1591                            is found in the winbindd cache. */
1592                         set_global_winbindd_state_offline();
1593                         break;
1594                 }
1595
1596                 new_conn->cli = NULL;
1597
1598                 result = cm_prepare_connection(domain, fd, domain->dcname,
1599                         &new_conn->cli, &retry);
1600
1601                 if (!retry)
1602                         break;
1603         }
1604
1605         if (NT_STATUS_IS_OK(result)) {
1606
1607                 winbindd_set_locator_kdc_envs(domain);
1608
1609                 if (domain->online == False) {
1610                         /* We're changing state from offline to online. */
1611                         set_global_winbindd_state_online();
1612                 }
1613                 set_domain_online(domain);
1614
1615                 /*
1616                  * Much as I hate global state, this seems to be the point
1617                  * where we can be certain that we have a proper connection to
1618                  * a DC. wbinfo --dc-info needs that information, store it in
1619                  * gencache with a looong timeout. This will need revisiting
1620                  * once we start to connect to multiple DCs, wbcDcInfo is
1621                  * already prepared for that.
1622                  */
1623                 store_current_dc_in_gencache(domain->name, domain->dcname,
1624                                              new_conn->cli);
1625         } else {
1626                 /* Ensure we setup the retry handler. */
1627                 set_domain_offline(domain);
1628         }
1629
1630         talloc_destroy(mem_ctx);
1631         return result;
1632 }
1633
1634 /* Close down all open pipes on a connection. */
1635
1636 void invalidate_cm_connection(struct winbindd_cm_conn *conn)
1637 {
1638         NTSTATUS result;
1639
1640         /* We're closing down a possibly dead
1641            connection. Don't have impossibly long (10s) timeouts. */
1642
1643         if (conn->cli) {
1644                 cli_set_timeout(conn->cli, 1000); /* 1 second. */
1645         }
1646
1647         if (conn->samr_pipe != NULL) {
1648                 if (is_valid_policy_hnd(&conn->sam_connect_handle)) {
1649                         dcerpc_samr_Close(conn->samr_pipe->binding_handle,
1650                                           talloc_tos(),
1651                                           &conn->sam_connect_handle,
1652                                           &result);
1653                 }
1654                 TALLOC_FREE(conn->samr_pipe);
1655                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1656                 if (conn->cli) {
1657                         cli_set_timeout(conn->cli, 500);
1658                 }
1659         }
1660
1661         if (conn->lsa_pipe != NULL) {
1662                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1663                         dcerpc_lsa_Close(conn->lsa_pipe->binding_handle,
1664                                          talloc_tos(),
1665                                          &conn->lsa_policy,
1666                                          &result);
1667                 }
1668                 TALLOC_FREE(conn->lsa_pipe);
1669                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1670                 if (conn->cli) {
1671                         cli_set_timeout(conn->cli, 500);
1672                 }
1673         }
1674
1675         if (conn->lsa_pipe_tcp != NULL) {
1676                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1677                         dcerpc_lsa_Close(conn->lsa_pipe_tcp->binding_handle,
1678                                          talloc_tos(),
1679                                          &conn->lsa_policy,
1680                                          &result);
1681                 }
1682                 TALLOC_FREE(conn->lsa_pipe_tcp);
1683                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1684                 if (conn->cli) {
1685                         cli_set_timeout(conn->cli, 500);
1686                 }
1687         }
1688
1689         if (conn->netlogon_pipe != NULL) {
1690                 TALLOC_FREE(conn->netlogon_pipe);
1691                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1692                 if (conn->cli) {
1693                         cli_set_timeout(conn->cli, 500);
1694                 }
1695         }
1696
1697         if (conn->cli) {
1698                 cli_shutdown(conn->cli);
1699         }
1700
1701         conn->cli = NULL;
1702 }
1703
1704 void close_conns_after_fork(void)
1705 {
1706         struct winbindd_domain *domain;
1707         struct winbindd_cli_state *cli_state;
1708
1709         for (domain = domain_list(); domain; domain = domain->next) {
1710                 struct cli_state *cli = domain->conn.cli;
1711
1712                 /*
1713                  * first close the low level SMB TCP connection
1714                  * so that we don't generate any SMBclose
1715                  * requests in invalidate_cm_connection()
1716                  */
1717                 if (cli && cli->fd != -1) {
1718                         close(domain->conn.cli->fd);
1719                         domain->conn.cli->fd = -1;
1720                 }
1721
1722                 invalidate_cm_connection(&domain->conn);
1723         }
1724
1725         for (cli_state = winbindd_client_list();
1726              cli_state != NULL;
1727              cli_state = cli_state->next) {
1728                 if (cli_state->sock >= 0) {
1729                         close(cli_state->sock);
1730                         cli_state->sock = -1;
1731                 }
1732         }
1733 }
1734
1735 static bool connection_ok(struct winbindd_domain *domain)
1736 {
1737         bool ok;
1738
1739         ok = cli_state_is_connected(domain->conn.cli);
1740         if (!ok) {
1741                 DEBUG(3, ("connection_ok: Connection to %s for domain %s is not connected\n",
1742                           domain->dcname, domain->name));
1743                 return False;
1744         }
1745
1746         if (domain->online == False) {
1747                 DEBUG(3, ("connection_ok: Domain %s is offline\n", domain->name));
1748                 return False;
1749         }
1750
1751         return True;
1752 }
1753
1754 /* Initialize a new connection up to the RPC BIND.
1755    Bypass online status check so always does network calls. */
1756
1757 static NTSTATUS init_dc_connection_network(struct winbindd_domain *domain)
1758 {
1759         NTSTATUS result;
1760
1761         /* Internal connections never use the network. */
1762         if (domain->internal) {
1763                 domain->initialized = True;
1764                 return NT_STATUS_OK;
1765         }
1766
1767         if (!winbindd_can_contact_domain(domain)) {
1768                 invalidate_cm_connection(&domain->conn);
1769                 domain->initialized = True;
1770                 return NT_STATUS_OK;
1771         }
1772
1773         if (connection_ok(domain)) {
1774                 if (!domain->initialized) {
1775                         set_dc_type_and_flags(domain);
1776                 }
1777                 return NT_STATUS_OK;
1778         }
1779
1780         invalidate_cm_connection(&domain->conn);
1781
1782         result = cm_open_connection(domain, &domain->conn);
1783
1784         if (NT_STATUS_IS_OK(result) && !domain->initialized) {
1785                 set_dc_type_and_flags(domain);
1786         }
1787
1788         return result;
1789 }
1790
1791 NTSTATUS init_dc_connection(struct winbindd_domain *domain)
1792 {
1793         if (domain->internal) {
1794                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1795         }
1796
1797         if (domain->initialized && !domain->online) {
1798                 /* We check for online status elsewhere. */
1799                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1800         }
1801
1802         return init_dc_connection_network(domain);
1803 }
1804
1805 static NTSTATUS init_dc_connection_rpc(struct winbindd_domain *domain)
1806 {
1807         NTSTATUS status;
1808
1809         status = init_dc_connection(domain);
1810         if (!NT_STATUS_IS_OK(status)) {
1811                 return status;
1812         }
1813
1814         if (!domain->internal && domain->conn.cli == NULL) {
1815                 /* happens for trusted domains without inbound trust */
1816                 return NT_STATUS_TRUSTED_DOMAIN_FAILURE;
1817         }
1818
1819         return NT_STATUS_OK;
1820 }
1821
1822 /******************************************************************************
1823  Set the trust flags (direction and forest location) for a domain
1824 ******************************************************************************/
1825
1826 static bool set_dc_type_and_flags_trustinfo( struct winbindd_domain *domain )
1827 {
1828         struct winbindd_domain *our_domain;
1829         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
1830         WERROR werr;
1831         struct netr_DomainTrustList trusts;
1832         int i;
1833         uint32 flags = (NETR_TRUST_FLAG_IN_FOREST |
1834                         NETR_TRUST_FLAG_OUTBOUND |
1835                         NETR_TRUST_FLAG_INBOUND);
1836         struct rpc_pipe_client *cli;
1837         TALLOC_CTX *mem_ctx = NULL;
1838         struct dcerpc_binding_handle *b;
1839
1840         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s\n", domain->name ));
1841
1842         /* Our primary domain doesn't need to worry about trust flags.
1843            Force it to go through the network setup */
1844         if ( domain->primary ) {
1845                 return False;
1846         }
1847
1848         our_domain = find_our_domain();
1849
1850         if ( !connection_ok(our_domain) ) {
1851                 DEBUG(3,("set_dc_type_and_flags_trustinfo: No connection to our domain!\n"));
1852                 return False;
1853         }
1854
1855         /* This won't work unless our domain is AD */
1856
1857         if ( !our_domain->active_directory ) {
1858                 return False;
1859         }
1860
1861         /* Use DsEnumerateDomainTrusts to get us the trust direction
1862            and type */
1863
1864         result = cm_connect_netlogon(our_domain, &cli);
1865
1866         if (!NT_STATUS_IS_OK(result)) {
1867                 DEBUG(5, ("set_dc_type_and_flags_trustinfo: Could not open "
1868                           "a connection to %s for PIPE_NETLOGON (%s)\n",
1869                           domain->name, nt_errstr(result)));
1870                 return False;
1871         }
1872
1873         b = cli->binding_handle;
1874
1875         if ( (mem_ctx = talloc_init("set_dc_type_and_flags_trustinfo")) == NULL ) {
1876                 DEBUG(0,("set_dc_type_and_flags_trustinfo: talloc_init() failed!\n"));
1877                 return False;
1878         }
1879
1880         result = dcerpc_netr_DsrEnumerateDomainTrusts(b, mem_ctx,
1881                                                       cli->desthost,
1882                                                       flags,
1883                                                       &trusts,
1884                                                       &werr);
1885         if (!NT_STATUS_IS_OK(result)) {
1886                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1887                         "failed to query trusted domain list: %s\n",
1888                         nt_errstr(result)));
1889                 talloc_destroy(mem_ctx);
1890                 return false;
1891         }
1892         if (!W_ERROR_IS_OK(werr)) {
1893                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1894                         "failed to query trusted domain list: %s\n",
1895                         win_errstr(werr)));
1896                 talloc_destroy(mem_ctx);
1897                 return false;
1898         }
1899
1900         /* Now find the domain name and get the flags */
1901
1902         for ( i=0; i<trusts.count; i++ ) {
1903                 if ( strequal( domain->name, trusts.array[i].netbios_name) ) {
1904                         domain->domain_flags          = trusts.array[i].trust_flags;
1905                         domain->domain_type           = trusts.array[i].trust_type;
1906                         domain->domain_trust_attribs  = trusts.array[i].trust_attributes;
1907
1908                         if ( domain->domain_type == NETR_TRUST_TYPE_UPLEVEL )
1909                                 domain->active_directory = True;
1910
1911                         /* This flag is only set if the domain is *our*
1912                            primary domain and the primary domain is in
1913                            native mode */
1914
1915                         domain->native_mode = (domain->domain_flags & NETR_TRUST_FLAG_NATIVE);
1916
1917                         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s is %sin "
1918                                   "native mode.\n", domain->name,
1919                                   domain->native_mode ? "" : "NOT "));
1920
1921                         DEBUG(5,("set_dc_type_and_flags_trustinfo: domain %s is %s"
1922                                  "running active directory.\n", domain->name,
1923                                  domain->active_directory ? "" : "NOT "));
1924
1925
1926                         domain->initialized = True;
1927
1928                         break;
1929                 }
1930         }
1931
1932         talloc_destroy( mem_ctx );
1933
1934         return domain->initialized;
1935 }
1936
1937 /******************************************************************************
1938  We can 'sense' certain things about the DC by it's replies to certain
1939  questions.
1940
1941  This tells us if this particular remote server is Active Directory, and if it
1942  is native mode.
1943 ******************************************************************************/
1944
1945 static void set_dc_type_and_flags_connect( struct winbindd_domain *domain )
1946 {
1947         NTSTATUS status, result;
1948         WERROR werr;
1949         TALLOC_CTX              *mem_ctx = NULL;
1950         struct rpc_pipe_client  *cli = NULL;
1951         struct policy_handle pol;
1952         union dssetup_DsRoleInfo info;
1953         union lsa_PolicyInformation *lsa_info = NULL;
1954
1955         if (!connection_ok(domain)) {
1956                 return;
1957         }
1958
1959         mem_ctx = talloc_init("set_dc_type_and_flags on domain %s\n",
1960                               domain->name);
1961         if (!mem_ctx) {
1962                 DEBUG(1, ("set_dc_type_and_flags_connect: talloc_init() failed\n"));
1963                 return;
1964         }
1965
1966         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s\n", domain->name ));
1967
1968         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
1969                                           &ndr_table_dssetup.syntax_id,
1970                                           &cli);
1971
1972         if (!NT_STATUS_IS_OK(status)) {
1973                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
1974                           "PI_DSSETUP on domain %s: (%s)\n",
1975                           domain->name, nt_errstr(status)));
1976
1977                 /* if this is just a non-AD domain we need to continue
1978                  * identifying so that we can in the end return with
1979                  * domain->initialized = True - gd */
1980
1981                 goto no_dssetup;
1982         }
1983
1984         status = dcerpc_dssetup_DsRoleGetPrimaryDomainInformation(cli->binding_handle, mem_ctx,
1985                                                                   DS_ROLE_BASIC_INFORMATION,
1986                                                                   &info,
1987                                                                   &werr);
1988         TALLOC_FREE(cli);
1989
1990         if (NT_STATUS_IS_OK(status)) {
1991                 result = werror_to_ntstatus(werr);
1992         }
1993         if (!NT_STATUS_IS_OK(status)) {
1994                 DEBUG(5, ("set_dc_type_and_flags_connect: rpccli_ds_getprimarydominfo "
1995                           "on domain %s failed: (%s)\n",
1996                           domain->name, nt_errstr(status)));
1997
1998                 /* older samba3 DCs will return DCERPC_FAULT_OP_RNG_ERROR for
1999                  * every opcode on the DSSETUP pipe, continue with
2000                  * no_dssetup mode here as well to get domain->initialized
2001                  * set - gd */
2002
2003                 if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE)) {
2004                         goto no_dssetup;
2005                 }
2006
2007                 TALLOC_FREE(mem_ctx);
2008                 return;
2009         }
2010
2011         if ((info.basic.flags & DS_ROLE_PRIMARY_DS_RUNNING) &&
2012             !(info.basic.flags & DS_ROLE_PRIMARY_DS_MIXED_MODE)) {
2013                 domain->native_mode = True;
2014         } else {
2015                 domain->native_mode = False;
2016         }
2017
2018 no_dssetup:
2019         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
2020                                           &ndr_table_lsarpc.syntax_id, &cli);
2021
2022         if (!NT_STATUS_IS_OK(status)) {
2023                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
2024                           "PI_LSARPC on domain %s: (%s)\n",
2025                           domain->name, nt_errstr(status)));
2026                 TALLOC_FREE(cli);
2027                 TALLOC_FREE(mem_ctx);
2028                 return;
2029         }
2030
2031         status = rpccli_lsa_open_policy2(cli, mem_ctx, True,
2032                                          SEC_FLAG_MAXIMUM_ALLOWED, &pol);
2033
2034         if (NT_STATUS_IS_OK(status)) {
2035                 /* This particular query is exactly what Win2k clients use
2036                    to determine that the DC is active directory */
2037                 status = dcerpc_lsa_QueryInfoPolicy2(cli->binding_handle, mem_ctx,
2038                                                      &pol,
2039                                                      LSA_POLICY_INFO_DNS,
2040                                                      &lsa_info,
2041                                                      &result);
2042         }
2043
2044         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2045                 domain->active_directory = True;
2046
2047                 if (lsa_info->dns.name.string) {
2048                         fstrcpy(domain->name, lsa_info->dns.name.string);
2049                 }
2050
2051                 if (lsa_info->dns.dns_domain.string) {
2052                         fstrcpy(domain->alt_name,
2053                                 lsa_info->dns.dns_domain.string);
2054                 }
2055
2056                 /* See if we can set some domain trust flags about
2057                    ourself */
2058
2059                 if (lsa_info->dns.dns_forest.string) {
2060                         fstrcpy(domain->forest_name,
2061                                 lsa_info->dns.dns_forest.string);
2062
2063                         if (strequal(domain->forest_name, domain->alt_name)) {
2064                                 domain->domain_flags |= NETR_TRUST_FLAG_TREEROOT;
2065                         }
2066                 }
2067
2068                 if (lsa_info->dns.sid) {
2069                         sid_copy(&domain->sid, lsa_info->dns.sid);
2070                 }
2071         } else {
2072                 domain->active_directory = False;
2073
2074                 status = rpccli_lsa_open_policy(cli, mem_ctx, True,
2075                                                 SEC_FLAG_MAXIMUM_ALLOWED,
2076                                                 &pol);
2077
2078                 if (!NT_STATUS_IS_OK(status)) {
2079                         goto done;
2080                 }
2081
2082                 status = dcerpc_lsa_QueryInfoPolicy(cli->binding_handle, mem_ctx,
2083                                                     &pol,
2084                                                     LSA_POLICY_INFO_ACCOUNT_DOMAIN,
2085                                                     &lsa_info,
2086                                                     &result);
2087                 if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2088
2089                         if (lsa_info->account_domain.name.string) {
2090                                 fstrcpy(domain->name,
2091                                         lsa_info->account_domain.name.string);
2092                         }
2093
2094                         if (lsa_info->account_domain.sid) {
2095                                 sid_copy(&domain->sid, lsa_info->account_domain.sid);
2096                         }
2097                 }
2098         }
2099 done:
2100
2101         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s is %sin native mode.\n",
2102                   domain->name, domain->native_mode ? "" : "NOT "));
2103
2104         DEBUG(5,("set_dc_type_and_flags_connect: domain %s is %srunning active directory.\n",
2105                   domain->name, domain->active_directory ? "" : "NOT "));
2106
2107         domain->can_do_ncacn_ip_tcp = domain->active_directory;
2108         domain->can_do_validation6 = domain->active_directory;
2109
2110         TALLOC_FREE(cli);
2111
2112         TALLOC_FREE(mem_ctx);
2113
2114         domain->initialized = True;
2115 }
2116
2117 /**********************************************************************
2118  Set the domain_flags (trust attributes, domain operating modes, etc...
2119 ***********************************************************************/
2120
2121 static void set_dc_type_and_flags( struct winbindd_domain *domain )
2122 {
2123         /* we always have to contact our primary domain */
2124
2125         if ( domain->primary ) {
2126                 DEBUG(10,("set_dc_type_and_flags: setting up flags for "
2127                           "primary domain\n"));
2128                 set_dc_type_and_flags_connect( domain );
2129                 return;
2130         }
2131
2132         /* Use our DC to get the information if possible */
2133
2134         if ( !set_dc_type_and_flags_trustinfo( domain ) ) {
2135                 /* Otherwise, fallback to contacting the
2136                    domain directly */
2137                 set_dc_type_and_flags_connect( domain );
2138         }
2139
2140         return;
2141 }
2142
2143
2144
2145 /**********************************************************************
2146 ***********************************************************************/
2147
2148 static NTSTATUS cm_get_schannel_creds(struct winbindd_domain *domain,
2149                                    struct netlogon_creds_CredentialState **ppdc)
2150 {
2151         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2152         struct rpc_pipe_client *netlogon_pipe;
2153
2154         if (lp_client_schannel() == False) {
2155                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2156         }
2157
2158         result = cm_connect_netlogon(domain, &netlogon_pipe);
2159         if (!NT_STATUS_IS_OK(result)) {
2160                 return result;
2161         }
2162
2163         /* Return a pointer to the struct netlogon_creds_CredentialState from the
2164            netlogon pipe. */
2165
2166         if (!domain->conn.netlogon_pipe->dc) {
2167                 return NT_STATUS_INTERNAL_ERROR; /* This shouldn't happen. */
2168         }
2169
2170         *ppdc = domain->conn.netlogon_pipe->dc;
2171         return NT_STATUS_OK;
2172 }
2173
2174 NTSTATUS cm_connect_sam(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2175                         struct rpc_pipe_client **cli, struct policy_handle *sam_handle)
2176 {
2177         struct winbindd_cm_conn *conn;
2178         NTSTATUS status, result;
2179         struct netlogon_creds_CredentialState *p_creds;
2180         char *machine_password = NULL;
2181         char *machine_account = NULL;
2182         char *domain_name = NULL;
2183
2184         if (sid_check_is_domain(&domain->sid)) {
2185                 return open_internal_samr_conn(mem_ctx, domain, cli, sam_handle);
2186         }
2187
2188         status = init_dc_connection_rpc(domain);
2189         if (!NT_STATUS_IS_OK(status)) {
2190                 return status;
2191         }
2192
2193         conn = &domain->conn;
2194
2195         if (rpccli_is_connected(conn->samr_pipe)) {
2196                 goto done;
2197         }
2198
2199         TALLOC_FREE(conn->samr_pipe);
2200
2201         /*
2202          * No SAMR pipe yet. Attempt to get an NTLMSSP SPNEGO authenticated
2203          * sign and sealed pipe using the machine account password by
2204          * preference. If we can't - try schannel, if that fails, try
2205          * anonymous.
2206          */
2207
2208         if ((conn->cli->user_name[0] == '\0') ||
2209             (conn->cli->domain[0] == '\0') ||
2210             (conn->cli->password == NULL || conn->cli->password[0] == '\0'))
2211         {
2212                 status = get_trust_creds(domain, &machine_password,
2213                                          &machine_account, NULL);
2214                 if (!NT_STATUS_IS_OK(status)) {
2215                         DEBUG(10, ("cm_connect_sam: No no user available for "
2216                                    "domain %s, trying schannel\n", conn->cli->domain));
2217                         goto schannel;
2218                 }
2219                 domain_name = domain->name;
2220         } else {
2221                 machine_password = SMB_STRDUP(conn->cli->password);
2222                 machine_account = SMB_STRDUP(conn->cli->user_name);
2223                 domain_name = conn->cli->domain;
2224         }
2225
2226         if (!machine_password || !machine_account) {
2227                 status = NT_STATUS_NO_MEMORY;
2228                 goto done;
2229         }
2230
2231         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2232            authenticated SAMR pipe with sign & seal. */
2233         status = cli_rpc_pipe_open_spnego_ntlmssp(conn->cli,
2234                                                   &ndr_table_samr.syntax_id,
2235                                                   NCACN_NP,
2236                                                   DCERPC_AUTH_LEVEL_PRIVACY,
2237                                                   domain_name,
2238                                                   machine_account,
2239                                                   machine_password,
2240                                                   &conn->samr_pipe);
2241
2242         if (!NT_STATUS_IS_OK(status)) {
2243                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR "
2244                           "pipe for domain %s using NTLMSSP "
2245                           "authenticated pipe: user %s\\%s. Error was "
2246                           "%s\n", domain->name, domain_name,
2247                           machine_account, nt_errstr(status)));
2248                 goto schannel;
2249         }
2250
2251         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for "
2252                   "domain %s using NTLMSSP authenticated "
2253                   "pipe: user %s\\%s\n", domain->name,
2254                   domain_name, machine_account));
2255
2256         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2257                                       conn->samr_pipe->desthost,
2258                                       SEC_FLAG_MAXIMUM_ALLOWED,
2259                                       &conn->sam_connect_handle,
2260                                       &result);
2261         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2262                 goto open_domain;
2263         }
2264         if (NT_STATUS_IS_OK(status)) {
2265                 status = result;
2266         }
2267
2268         DEBUG(10,("cm_connect_sam: ntlmssp-sealed dcerpc_samr_Connect2 "
2269                   "failed for domain %s, error was %s. Trying schannel\n",
2270                   domain->name, nt_errstr(status) ));
2271         TALLOC_FREE(conn->samr_pipe);
2272
2273  schannel:
2274
2275         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2276
2277         status = cm_get_schannel_creds(domain, &p_creds);
2278         if (!NT_STATUS_IS_OK(status)) {
2279                 /* If this call fails - conn->cli can now be NULL ! */
2280                 DEBUG(10, ("cm_connect_sam: Could not get schannel auth info "
2281                            "for domain %s (error %s), trying anon\n",
2282                         domain->name,
2283                         nt_errstr(status) ));
2284                 goto anonymous;
2285         }
2286         status = cli_rpc_pipe_open_schannel_with_key
2287                 (conn->cli, &ndr_table_samr.syntax_id, NCACN_NP,
2288                  DCERPC_AUTH_LEVEL_PRIVACY,
2289                  domain->name, &p_creds, &conn->samr_pipe);
2290
2291         if (!NT_STATUS_IS_OK(status)) {
2292                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR pipe for "
2293                           "domain %s using schannel. Error was %s\n",
2294                           domain->name, nt_errstr(status) ));
2295                 goto anonymous;
2296         }
2297         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for domain %s using "
2298                   "schannel.\n", domain->name ));
2299
2300         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2301                                       conn->samr_pipe->desthost,
2302                                       SEC_FLAG_MAXIMUM_ALLOWED,
2303                                       &conn->sam_connect_handle,
2304                                       &result);
2305         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2306                 goto open_domain;
2307         }
2308         if (NT_STATUS_IS_OK(status)) {
2309                 status = result;
2310         }
2311         DEBUG(10,("cm_connect_sam: schannel-sealed dcerpc_samr_Connect2 failed "
2312                   "for domain %s, error was %s. Trying anonymous\n",
2313                   domain->name, nt_errstr(status) ));
2314         TALLOC_FREE(conn->samr_pipe);
2315
2316  anonymous:
2317
2318         /* Finally fall back to anonymous. */
2319         status = cli_rpc_pipe_open_noauth(conn->cli, &ndr_table_samr.syntax_id,
2320                                           &conn->samr_pipe);
2321
2322         if (!NT_STATUS_IS_OK(status)) {
2323                 goto done;
2324         }
2325
2326         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2327                                       conn->samr_pipe->desthost,
2328                                       SEC_FLAG_MAXIMUM_ALLOWED,
2329                                       &conn->sam_connect_handle,
2330                                       &result);
2331         if (!NT_STATUS_IS_OK(status)) {
2332                 DEBUG(10,("cm_connect_sam: rpccli_samr_Connect2 failed "
2333                           "for domain %s Error was %s\n",
2334                           domain->name, nt_errstr(status) ));
2335                 goto done;
2336         }
2337         if (!NT_STATUS_IS_OK(result)) {
2338                 status = result;
2339                 DEBUG(10,("cm_connect_sam: dcerpc_samr_Connect2 failed "
2340                           "for domain %s Error was %s\n",
2341                           domain->name, nt_errstr(result)));
2342                 goto done;
2343         }
2344
2345  open_domain:
2346         status = dcerpc_samr_OpenDomain(conn->samr_pipe->binding_handle,
2347                                         mem_ctx,
2348                                         &conn->sam_connect_handle,
2349                                         SEC_FLAG_MAXIMUM_ALLOWED,
2350                                         &domain->sid,
2351                                         &conn->sam_domain_handle,
2352                                         &result);
2353         if (!NT_STATUS_IS_OK(status)) {
2354                 goto done;
2355         }
2356
2357         status = result;
2358  done:
2359
2360         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
2361                 /*
2362                  * if we got access denied, we might just have no access rights
2363                  * to talk to the remote samr server server (e.g. when we are a
2364                  * PDC and we are connecting a w2k8 pdc via an interdomain
2365                  * trust). In that case do not invalidate the whole connection
2366                  * stack
2367                  */
2368                 TALLOC_FREE(conn->samr_pipe);
2369                 ZERO_STRUCT(conn->sam_domain_handle);
2370                 return status;
2371         } else if (!NT_STATUS_IS_OK(status)) {
2372                 invalidate_cm_connection(conn);
2373                 return status;
2374         }
2375
2376         *cli = conn->samr_pipe;
2377         *sam_handle = conn->sam_domain_handle;
2378         SAFE_FREE(machine_password);
2379         SAFE_FREE(machine_account);
2380         return status;
2381 }
2382
2383 /**********************************************************************
2384  open an schanneld ncacn_ip_tcp connection to LSA
2385 ***********************************************************************/
2386
2387 NTSTATUS cm_connect_lsa_tcp(struct winbindd_domain *domain,
2388                             TALLOC_CTX *mem_ctx,
2389                             struct rpc_pipe_client **cli)
2390 {
2391         struct winbindd_cm_conn *conn;
2392         struct netlogon_creds_CredentialState *creds;
2393         NTSTATUS status;
2394
2395         DEBUG(10,("cm_connect_lsa_tcp\n"));
2396
2397         status = init_dc_connection_rpc(domain);
2398         if (!NT_STATUS_IS_OK(status)) {
2399                 return status;
2400         }
2401
2402         conn = &domain->conn;
2403
2404         if (conn->lsa_pipe_tcp &&
2405             conn->lsa_pipe_tcp->transport->transport == NCACN_IP_TCP &&
2406             conn->lsa_pipe_tcp->auth->auth_level == DCERPC_AUTH_LEVEL_PRIVACY &&
2407             rpccli_is_connected(conn->lsa_pipe_tcp)) {
2408                 goto done;
2409         }
2410
2411         TALLOC_FREE(conn->lsa_pipe_tcp);
2412
2413         status = cm_get_schannel_creds(domain, &creds);
2414         if (!NT_STATUS_IS_OK(status)) {
2415                 goto done;
2416         }
2417
2418         status = cli_rpc_pipe_open_schannel_with_key(conn->cli,
2419                                                      &ndr_table_lsarpc.syntax_id,
2420                                                      NCACN_IP_TCP,
2421                                                      DCERPC_AUTH_LEVEL_PRIVACY,
2422                                                      domain->name,
2423                                                      &creds,
2424                                                      &conn->lsa_pipe_tcp);
2425         if (!NT_STATUS_IS_OK(status)) {
2426                 DEBUG(10,("cli_rpc_pipe_open_schannel_with_key failed: %s\n",
2427                         nt_errstr(status)));
2428                 goto done;
2429         }
2430
2431  done:
2432         if (!NT_STATUS_IS_OK(status)) {
2433                 TALLOC_FREE(conn->lsa_pipe_tcp);
2434                 return status;
2435         }
2436
2437         *cli = conn->lsa_pipe_tcp;
2438
2439         return status;
2440 }
2441
2442 NTSTATUS cm_connect_lsa(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2443                         struct rpc_pipe_client **cli, struct policy_handle *lsa_policy)
2444 {
2445         struct winbindd_cm_conn *conn;
2446         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2447         struct netlogon_creds_CredentialState *p_creds;
2448
2449         result = init_dc_connection_rpc(domain);
2450         if (!NT_STATUS_IS_OK(result))
2451                 return result;
2452
2453         conn = &domain->conn;
2454
2455         if (rpccli_is_connected(conn->lsa_pipe)) {
2456                 goto done;
2457         }
2458
2459         TALLOC_FREE(conn->lsa_pipe);
2460
2461         if ((conn->cli->user_name[0] == '\0') ||
2462             (conn->cli->domain[0] == '\0') ||
2463             (conn->cli->password == NULL || conn->cli->password[0] == '\0')) {
2464                 DEBUG(10, ("cm_connect_lsa: No no user available for "
2465                            "domain %s, trying schannel\n", conn->cli->domain));
2466                 goto schannel;
2467         }
2468
2469         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2470          * authenticated LSA pipe with sign & seal. */
2471         result = cli_rpc_pipe_open_spnego_ntlmssp
2472                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2473                  DCERPC_AUTH_LEVEL_PRIVACY,
2474                  conn->cli->domain, conn->cli->user_name, conn->cli->password,
2475                  &conn->lsa_pipe);
2476
2477         if (!NT_STATUS_IS_OK(result)) {
2478                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2479                           "domain %s using NTLMSSP authenticated pipe: user "
2480                           "%s\\%s. Error was %s. Trying schannel.\n",
2481                           domain->name, conn->cli->domain,
2482                           conn->cli->user_name, nt_errstr(result)));
2483                 goto schannel;
2484         }
2485
2486         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2487                   "NTLMSSP authenticated pipe: user %s\\%s\n",
2488                   domain->name, conn->cli->domain, conn->cli->user_name ));
2489
2490         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2491                                         SEC_FLAG_MAXIMUM_ALLOWED,
2492                                         &conn->lsa_policy);
2493         if (NT_STATUS_IS_OK(result)) {
2494                 goto done;
2495         }
2496
2497         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2498                   "schannel\n"));
2499
2500         TALLOC_FREE(conn->lsa_pipe);
2501
2502  schannel:
2503
2504         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2505
2506         result = cm_get_schannel_creds(domain, &p_creds);
2507         if (!NT_STATUS_IS_OK(result)) {
2508                 /* If this call fails - conn->cli can now be NULL ! */
2509                 DEBUG(10, ("cm_connect_lsa: Could not get schannel auth info "
2510                            "for domain %s (error %s), trying anon\n",
2511                         domain->name,
2512                         nt_errstr(result) ));
2513                 goto anonymous;
2514         }
2515         result = cli_rpc_pipe_open_schannel_with_key
2516                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2517                  DCERPC_AUTH_LEVEL_PRIVACY,
2518                  domain->name, &p_creds, &conn->lsa_pipe);
2519
2520         if (!NT_STATUS_IS_OK(result)) {
2521                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2522                           "domain %s using schannel. Error was %s\n",
2523                           domain->name, nt_errstr(result) ));
2524                 goto anonymous;
2525         }
2526         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2527                   "schannel.\n", domain->name ));
2528
2529         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2530                                         SEC_FLAG_MAXIMUM_ALLOWED,
2531                                         &conn->lsa_policy);
2532         if (NT_STATUS_IS_OK(result)) {
2533                 goto done;
2534         }
2535
2536         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2537                   "anonymous\n"));
2538
2539         TALLOC_FREE(conn->lsa_pipe);
2540
2541  anonymous:
2542
2543         result = cli_rpc_pipe_open_noauth(conn->cli,
2544                                           &ndr_table_lsarpc.syntax_id,
2545                                           &conn->lsa_pipe);
2546         if (!NT_STATUS_IS_OK(result)) {
2547                 result = NT_STATUS_PIPE_NOT_AVAILABLE;
2548                 goto done;
2549         }
2550
2551         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2552                                         SEC_FLAG_MAXIMUM_ALLOWED,
2553                                         &conn->lsa_policy);
2554  done:
2555         if (!NT_STATUS_IS_OK(result)) {
2556                 invalidate_cm_connection(conn);
2557                 return result;
2558         }
2559
2560         *cli = conn->lsa_pipe;
2561         *lsa_policy = conn->lsa_policy;
2562         return result;
2563 }
2564
2565 /****************************************************************************
2566  Open the netlogon pipe to this DC. Use schannel if specified in client conf.
2567  session key stored in conn->netlogon_pipe->dc->sess_key.
2568 ****************************************************************************/
2569
2570 NTSTATUS cm_connect_netlogon(struct winbindd_domain *domain,
2571                              struct rpc_pipe_client **cli)
2572 {
2573         struct winbindd_cm_conn *conn;
2574         NTSTATUS result;
2575
2576         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
2577         uint8  mach_pwd[16];
2578         enum netr_SchannelType sec_chan_type;
2579         const char *account_name;
2580         struct rpc_pipe_client *netlogon_pipe = NULL;
2581
2582         *cli = NULL;
2583
2584         result = init_dc_connection_rpc(domain);
2585         if (!NT_STATUS_IS_OK(result)) {
2586                 return result;
2587         }
2588
2589         conn = &domain->conn;
2590
2591         if (rpccli_is_connected(conn->netlogon_pipe)) {
2592                 *cli = conn->netlogon_pipe;
2593                 return NT_STATUS_OK;
2594         }
2595
2596         TALLOC_FREE(conn->netlogon_pipe);
2597
2598         result = cli_rpc_pipe_open_noauth(conn->cli,
2599                                           &ndr_table_netlogon.syntax_id,
2600                                           &netlogon_pipe);
2601         if (!NT_STATUS_IS_OK(result)) {
2602                 return result;
2603         }
2604
2605         if ((!IS_DC) && (!domain->primary)) {
2606                 /* Clear the schannel request bit and drop down */
2607                 neg_flags &= ~NETLOGON_NEG_SCHANNEL;
2608                 goto no_schannel;
2609         }
2610
2611         if (lp_client_schannel() != False) {
2612                 neg_flags |= NETLOGON_NEG_SCHANNEL;
2613         }
2614
2615         if (!get_trust_pw_hash(domain->name, mach_pwd, &account_name,
2616                                &sec_chan_type))
2617         {
2618                 TALLOC_FREE(netlogon_pipe);
2619                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2620         }
2621
2622         result = rpccli_netlogon_setup_creds(
2623                  netlogon_pipe,
2624                  domain->dcname, /* server name. */
2625                  domain->name,   /* domain name */
2626                  global_myname(), /* client name */
2627                  account_name,   /* machine account */
2628                  mach_pwd,       /* machine password */
2629                  sec_chan_type,  /* from get_trust_pw */
2630                  &neg_flags);
2631
2632         if (!NT_STATUS_IS_OK(result)) {
2633                 TALLOC_FREE(netlogon_pipe);
2634                 return result;
2635         }
2636
2637         if ((lp_client_schannel() == True) &&
2638                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2639                 DEBUG(3, ("Server did not offer schannel\n"));
2640                 TALLOC_FREE(netlogon_pipe);
2641                 return NT_STATUS_ACCESS_DENIED;
2642         }
2643
2644  no_schannel:
2645         if ((lp_client_schannel() == False) ||
2646                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2647                 /*
2648                  * NetSamLogonEx only works for schannel
2649                  */
2650                 domain->can_do_samlogon_ex = False;
2651
2652                 /* We're done - just keep the existing connection to NETLOGON
2653                  * open */
2654                 conn->netlogon_pipe = netlogon_pipe;
2655                 *cli = conn->netlogon_pipe;
2656                 return NT_STATUS_OK;
2657         }
2658
2659         /* Using the credentials from the first pipe, open a signed and sealed
2660            second netlogon pipe. The session key is stored in the schannel
2661            part of the new pipe auth struct.
2662         */
2663
2664         result = cli_rpc_pipe_open_schannel_with_key(
2665                 conn->cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
2666                 DCERPC_AUTH_LEVEL_PRIVACY, domain->name, &netlogon_pipe->dc,
2667                 &conn->netlogon_pipe);
2668
2669         /* We can now close the initial netlogon pipe. */
2670         TALLOC_FREE(netlogon_pipe);
2671
2672         if (!NT_STATUS_IS_OK(result)) {
2673                 DEBUG(3, ("Could not open schannel'ed NETLOGON pipe. Error "
2674                           "was %s\n", nt_errstr(result)));
2675
2676                 invalidate_cm_connection(conn);
2677                 return result;
2678         }
2679
2680         /*
2681          * Always try netr_LogonSamLogonEx. We will fall back for NT4
2682          * which gives DCERPC_FAULT_OP_RNG_ERROR (function not
2683          * supported). We used to only try SamLogonEx for AD, but
2684          * Samba DCs can also do it. And because we don't distinguish
2685          * between Samba and NT4, always try it once.
2686          */
2687         domain->can_do_samlogon_ex = true;
2688
2689         *cli = conn->netlogon_pipe;
2690         return NT_STATUS_OK;
2691 }
2692
2693 void winbind_msg_ip_dropped(struct messaging_context *msg_ctx,
2694                             void *private_data,
2695                             uint32_t msg_type,
2696                             struct server_id server_id,
2697                             DATA_BLOB *data)
2698 {
2699         struct winbindd_domain *domain;
2700         char *freeit = NULL;
2701         char *addr;
2702
2703         if ((data == NULL)
2704             || (data->data == NULL)
2705             || (data->length == 0)
2706             || (data->data[data->length-1] != '\0')) {
2707                 DEBUG(1, ("invalid msg_ip_dropped message: not a valid "
2708                           "string\n"));
2709                 return;
2710         }
2711
2712         addr = (char *)data->data;
2713         DEBUG(10, ("IP %s dropped\n", addr));
2714
2715         if (!is_ipaddress(addr)) {
2716                 char *slash;
2717                 /*
2718                  * Some code sends us ip addresses with the /netmask
2719                  * suffix
2720                  */
2721                 slash = strchr(addr, '/');
2722                 if (slash == NULL) {
2723                         DEBUG(1, ("invalid msg_ip_dropped message: %s",
2724                                   addr));
2725                         return;
2726                 }
2727                 freeit = talloc_strndup(talloc_tos(), addr, slash-addr);
2728                 if (freeit == NULL) {
2729                         DEBUG(1, ("talloc failed\n"));
2730                         return;
2731                 }
2732                 addr = freeit;
2733                 DEBUG(10, ("Stripped /netmask to IP %s\n", addr));
2734         }
2735
2736         for (domain = domain_list(); domain != NULL; domain = domain->next) {
2737                 char sockaddr[INET6_ADDRSTRLEN];
2738                 if (domain->conn.cli == NULL) {
2739                         continue;
2740                 }
2741                 if (domain->conn.cli->fd == -1) {
2742                         continue;
2743                 }
2744                 client_socket_addr(domain->conn.cli->fd, sockaddr,
2745                                    sizeof(sockaddr));
2746                 if (strequal(sockaddr, addr)) {
2747                         close(domain->conn.cli->fd);
2748                         domain->conn.cli->fd = -1;
2749                 }
2750         }
2751         TALLOC_FREE(freeit);
2752 }