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/libsmb.h"
  73 #include "libsmb/clidgram.h"
  74 #include "ads.h"
  75 #include "secrets.h"
  76 #include "../libcli/security/security.h"
  77 #include "passdb.h"
  78 #include "messages.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         NTSTATUS status;
 193
 194         if (domain->dc_probe_pid != (pid_t)-1) {
 195                 /*
 196                  * We might already have a DC probe
 197                  * child working, check.
 198                  */
 199                 if (process_exists_by_pid(domain->dc_probe_pid)) {
 200                         DEBUG(10,("fork_child_dc_connect: pid %u already "
 201                                 "checking for DC's.\n",
 202                                 (unsigned int)domain->dc_probe_pid));
 203                         return true;
 204                 }
 205                 domain->dc_probe_pid = (pid_t)-1;
 206         }
 207
 208         domain->dc_probe_pid = sys_fork();
 209
 210         if (domain->dc_probe_pid == (pid_t)-1) {
 211                 DEBUG(0, ("fork_child_dc_connect: Could not fork: %s\n", strerror(errno)));
 212                 return False;
 213         }
 214
 215         if (domain->dc_probe_pid != (pid_t)0) {
 216                 /* Parent */
 217                 messaging_register(winbind_messaging_context(), NULL,
 218                                    MSG_WINBIND_TRY_TO_GO_ONLINE,
 219                                    msg_try_to_go_online);
 220                 messaging_register(winbind_messaging_context(), NULL,
 221                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 222                                    msg_failed_to_go_online);
 223                 return True;
 224         }
 225
 226         /* Child. */
 227
 228         /* Leave messages blocked - we will never process one. */
 229
 230         if (!override_logfile) {
 231                 if (asprintf(&lfile, "%s/log.winbindd-dc-connect", get_dyn_LOGFILEBASE()) == -1) {
 232                         DEBUG(0, ("fork_child_dc_connect: out of memory.\n"));
 233                         _exit(1);
 234                 }
 235         }
 236
 237         status = winbindd_reinit_after_fork(NULL, lfile);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
 240                           nt_errstr(status)));
 241                 messaging_send_buf(winbind_messaging_context(),
 242                                    pid_to_procid(parent_pid),
 243                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 244                                    (uint8 *)domain->name,
 245                                    strlen(domain->name)+1);
 246                 _exit(1);
 247         }
 248         SAFE_FREE(lfile);
 249
 250         mem_ctx = talloc_init("fork_child_dc_connect");
 251         if (!mem_ctx) {
 252                 DEBUG(0,("talloc_init failed.\n"));
 253                 messaging_send_buf(winbind_messaging_context(),
 254                                    pid_to_procid(parent_pid),
 255                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 256                                    (uint8 *)domain->name,
 257                                    strlen(domain->name)+1);
 258                 _exit(1);
 259         }
 260
 261         if ((!get_dcs(mem_ctx, domain, &dcs, &num_dcs)) || (num_dcs == 0)) {
 262                 /* Still offline ? Can't find DC's. */
 263                 messaging_send_buf(winbind_messaging_context(),
 264                                    pid_to_procid(parent_pid),
 265                                    MSG_WINBIND_FAILED_TO_GO_ONLINE,
 266                                    (uint8 *)domain->name,
 267                                    strlen(domain->name)+1);
 268                 _exit(0);
 269         }
 270
 271         /* We got a DC. Send a message to our parent to get it to
 272            try and do the same. */
 273
 274         messaging_send_buf(winbind_messaging_context(),
 275                            pid_to_procid(parent_pid),
 276                            MSG_WINBIND_TRY_TO_GO_ONLINE,
 277                            (uint8 *)domain->name,
 278                            strlen(domain->name)+1);
 279         _exit(0);
 280 }
 281
 282 /****************************************************************
 283  Handler triggered if we're offline to try and detect a DC.
 284 ****************************************************************/
 285
 286 static void check_domain_online_handler(struct event_context *ctx,
 287                                         struct timed_event *te,
 288                                         struct timeval now,
 289                                         void *private_data)
 290 {
 291         struct winbindd_domain *domain =
 292                 (struct winbindd_domain *)private_data;
 293
 294         DEBUG(10,("check_domain_online_handler: called for domain "
 295                   "%s (online = %s)\n", domain->name,
 296                   domain->online ? "True" : "False" ));
 297
 298         TALLOC_FREE(domain->check_online_event);
 299
 300         /* Are we still in "startup" mode ? */
 301
 302         if (domain->startup && (time_mono(NULL) > domain->startup_time + 30)) {
 303                 /* No longer in "startup" mode. */
 304                 DEBUG(10,("check_domain_online_handler: domain %s no longer in 'startup' mode.\n",
 305                         domain->name ));
 306                 domain->startup = False;
 307         }
 308
 309         /* We've been told to stay offline, so stay
 310            that way. */
 311
 312         if (get_global_winbindd_state_offline()) {
 313                 DEBUG(10,("check_domain_online_handler: domain %s remaining globally offline\n",
 314                         domain->name ));
 315                 return;
 316         }
 317
 318         /* Fork a child to test if it can contact a DC.
 319            If it can then send ourselves a message to
 320            cause a reconnect. */
 321
 322         fork_child_dc_connect(domain);
 323 }
 324
 325 /****************************************************************
 326  If we're still offline setup the timeout check.
 327 ****************************************************************/
 328
 329 static void calc_new_online_timeout_check(struct winbindd_domain *domain)
 330 {
 331         int wbr = lp_winbind_reconnect_delay();
 332
 333         if (domain->startup) {
 334                 domain->check_online_timeout = 10;
 335         } else if (domain->check_online_timeout < wbr) {
 336                 domain->check_online_timeout = wbr;
 337         }
 338 }
 339
 340 /****************************************************************
 341  Set domain offline and also add handler to put us back online
 342  if we detect a DC.
 343 ****************************************************************/
 344
 345 void set_domain_offline(struct winbindd_domain *domain)
 346 {
 347         DEBUG(10,("set_domain_offline: called for domain %s\n",
 348                 domain->name ));
 349
 350         TALLOC_FREE(domain->check_online_event);
 351
 352         if (domain->internal) {
 353                 DEBUG(3,("set_domain_offline: domain %s is internal - logic error.\n",
 354                         domain->name ));
 355                 return;
 356         }
 357
 358         domain->online = False;
 359
 360         /* Offline domains are always initialized. They're
 361            re-initialized when they go back online. */
 362
 363         domain->initialized = True;
 364
 365         /* We only add the timeout handler that checks and
 366            allows us to go back online when we've not
 367            been told to remain offline. */
 368
 369         if (get_global_winbindd_state_offline()) {
 370                 DEBUG(10,("set_domain_offline: domain %s remaining globally offline\n",
 371                         domain->name ));
 372                 return;
 373         }
 374
 375         /* If we're in startup mode, check again in 10 seconds, not in
 376            lp_winbind_reconnect_delay() seconds (which is 30 seconds by default). */
 377
 378         calc_new_online_timeout_check(domain);
 379
 380         domain->check_online_event = event_add_timed(winbind_event_context(),
 381                                                 NULL,
 382                                                 timeval_current_ofs(domain->check_online_timeout,0),
 383                                                 check_domain_online_handler,
 384                                                 domain);
 385
 386         /* The above *has* to succeed for winbindd to work. */
 387         if (!domain->check_online_event) {
 388                 smb_panic("set_domain_offline: failed to add online handler");
 389         }
 390
 391         DEBUG(10,("set_domain_offline: added event handler for domain %s\n",
 392                 domain->name ));
 393
 394         /* Send an offline message to the idmap child when our
 395            primary domain goes offline */
 396
 397         if ( domain->primary ) {
 398                 struct winbindd_child *idmap = idmap_child();
 399
 400                 if ( idmap->pid != 0 ) {
 401                         messaging_send_buf(winbind_messaging_context(),
 402                                            pid_to_procid(idmap->pid),
 403                                            MSG_WINBIND_OFFLINE,
 404                                            (uint8 *)domain->name,
 405                                            strlen(domain->name)+1);
 406                 }
 407         }
 408
 409         return;
 410 }
 411
 412 /****************************************************************
 413  Set domain online - if allowed.
 414 ****************************************************************/
 415
 416 static void set_domain_online(struct winbindd_domain *domain)
 417 {
 418         DEBUG(10,("set_domain_online: called for domain %s\n",
 419                 domain->name ));
 420
 421         if (domain->internal) {
 422                 DEBUG(3,("set_domain_online: domain %s is internal - logic error.\n",
 423                         domain->name ));
 424                 return;
 425         }
 426
 427         if (get_global_winbindd_state_offline()) {
 428                 DEBUG(10,("set_domain_online: domain %s remaining globally offline\n",
 429                         domain->name ));
 430                 return;
 431         }
 432
 433         winbindd_set_locator_kdc_envs(domain);
 434
 435         /* If we are waiting to get a krb5 ticket, trigger immediately. */
 436         ccache_regain_all_now();
 437
 438         /* Ok, we're out of any startup mode now... */
 439         domain->startup = False;
 440
 441         if (domain->online == False) {
 442                 /* We were offline - now we're online. We default to
 443                    using the MS-RPC backend if we started offline,
 444                    and if we're going online for the first time we
 445                    should really re-initialize the backends and the
 446                    checks to see if we're talking to an AD or NT domain.
 447                 */
 448
 449                 domain->initialized = False;
 450
 451                 /* 'reconnect_methods' is the MS-RPC backend. */
 452                 if (domain->backend == &reconnect_methods) {
 453                         domain->backend = NULL;
 454                 }
 455         }
 456
 457         /* Ensure we have no online timeout checks. */
 458         domain->check_online_timeout = 0;
 459         TALLOC_FREE(domain->check_online_event);
 460
 461         /* Ensure we ignore any pending child messages. */
 462         messaging_deregister(winbind_messaging_context(),
 463                              MSG_WINBIND_TRY_TO_GO_ONLINE, NULL);
 464         messaging_deregister(winbind_messaging_context(),
 465                              MSG_WINBIND_FAILED_TO_GO_ONLINE, NULL);
 466
 467         domain->online = True;
 468
 469         /* Send an online message to the idmap child when our
 470            primary domain comes online */
 471
 472         if ( domain->primary ) {
 473                 struct winbindd_child *idmap = idmap_child();
 474
 475                 if ( idmap->pid != 0 ) {
 476                         messaging_send_buf(winbind_messaging_context(),
 477                                            pid_to_procid(idmap->pid),
 478                                            MSG_WINBIND_ONLINE,
 479                                            (uint8 *)domain->name,
 480                                            strlen(domain->name)+1);
 481                 }
 482         }
 483
 484         return;
 485 }
 486
 487 /****************************************************************
 488  Requested to set a domain online.
 489 ****************************************************************/
 490
 491 void set_domain_online_request(struct winbindd_domain *domain)
 492 {
 493         struct timeval tev;
 494
 495         DEBUG(10,("set_domain_online_request: called for domain %s\n",
 496                 domain->name ));
 497
 498         if (get_global_winbindd_state_offline()) {
 499                 DEBUG(10,("set_domain_online_request: domain %s remaining globally offline\n",
 500                         domain->name ));
 501                 return;
 502         }
 503
 504         if (domain->internal) {
 505                 DEBUG(10, ("set_domain_online_request: Internal domains are "
 506                            "always online\n"));
 507                 return;
 508         }
 509
 510         /* We've been told it's safe to go online and
 511            try and connect to a DC. But I don't believe it
 512            because network manager seems to lie.
 513            Wait at least 5 seconds. Heuristics suck... */
 514
 515
 516         GetTimeOfDay(&tev);
 517
 518         /* Go into "startup" mode again. */
 519         domain->startup_time = time_mono(NULL);
 520         domain->startup = True;
 521
 522         tev.tv_sec += 5;
 523
 524         if (!domain->check_online_event) {
 525                 /* If we've come from being globally offline we
 526                    don't have a check online event handler set.
 527                    We need to add one now we're trying to go
 528                    back online. */
 529
 530                 DEBUG(10,("set_domain_online_request: domain %s was globally offline.\n",
 531                         domain->name ));
 532         }
 533
 534         TALLOC_FREE(domain->check_online_event);
 535
 536         domain->check_online_event = event_add_timed(winbind_event_context(),
 537                                                      NULL,
 538                                                      tev,
 539                                                      check_domain_online_handler,
 540                                                      domain);
 541
 542         /* The above *has* to succeed for winbindd to work. */
 543         if (!domain->check_online_event) {
 544                 smb_panic("set_domain_online_request: failed to add online handler");
 545         }
 546 }
 547
 548 /****************************************************************
 549  Add -ve connection cache entries for domain and realm.
 550 ****************************************************************/
 551
 552 static void winbind_add_failed_connection_entry(
 553         const struct winbindd_domain *domain,
 554         const char *server,
 555         NTSTATUS result)
 556 {
 557         add_failed_connection_entry(domain->name, server, result);
 558         /* If this was the saf name for the last thing we talked to,
 559            remove it. */
 560         saf_delete(domain->name);
 561         if (*domain->alt_name) {
 562                 add_failed_connection_entry(domain->alt_name, server, result);
 563                 saf_delete(domain->alt_name);
 564         }
 565         winbindd_unset_locator_kdc_env(domain);
 566 }
 567
 568 /* Choose between anonymous or authenticated connections.  We need to use
 569    an authenticated connection if DCs have the RestrictAnonymous registry
 570    entry set > 0, or the "Additional restrictions for anonymous
 571    connections" set in the win2k Local Security Policy.
 572
 573    Caller to free() result in domain, username, password
 574 */
 575
 576 static void cm_get_ipc_userpass(char **username, char **domain, char **password)
 577 {
 578         *username = (char *)secrets_fetch(SECRETS_AUTH_USER, NULL);
 579         *domain = (char *)secrets_fetch(SECRETS_AUTH_DOMAIN, NULL);
 580         *password = (char *)secrets_fetch(SECRETS_AUTH_PASSWORD, NULL);
 581
 582         if (*username && **username) {
 583
 584                 if (!*domain || !**domain)
 585                         *domain = smb_xstrdup(lp_workgroup());
 586
 587                 if (!*password || !**password)
 588                         *password = smb_xstrdup("");
 589
 590                 DEBUG(3, ("cm_get_ipc_userpass: Retrieved auth-user from secrets.tdb [%s\\%s]\n",
 591                           *domain, *username));
 592
 593         } else {
 594                 DEBUG(3, ("cm_get_ipc_userpass: No auth-user defined\n"));
 595                 *username = smb_xstrdup("");
 596                 *domain = smb_xstrdup("");
 597                 *password = smb_xstrdup("");
 598         }
 599 }
 600
 601 static bool get_dc_name_via_netlogon(struct winbindd_domain *domain,
 602                                      fstring dcname,
 603                                      struct sockaddr_storage *dc_ss)
 604 {
 605         struct winbindd_domain *our_domain = NULL;
 606         struct rpc_pipe_client *netlogon_pipe = NULL;
 607         NTSTATUS result;
 608         WERROR werr;
 609         TALLOC_CTX *mem_ctx;
 610         unsigned int orig_timeout;
 611         const char *tmp = NULL;
 612         const char *p;
 613         struct dcerpc_binding_handle *b;
 614
 615         /* Hmmmm. We can only open one connection to the NETLOGON pipe at the
 616          * moment.... */
 617
 618         if (IS_DC) {
 619                 return False;
 620         }
 621
 622         if (domain->primary) {
 623                 return False;
 624         }
 625
 626         our_domain = find_our_domain();
 627
 628         if ((mem_ctx = talloc_init("get_dc_name_via_netlogon")) == NULL) {
 629                 return False;
 630         }
 631
 632         result = cm_connect_netlogon(our_domain, &netlogon_pipe);
 633         if (!NT_STATUS_IS_OK(result)) {
 634                 talloc_destroy(mem_ctx);
 635                 return False;
 636         }
 637
 638         b = netlogon_pipe->binding_handle;
 639
 640         /* This call can take a long time - allow the server to time out.
 641            35 seconds should do it. */
 642
 643         orig_timeout = rpccli_set_timeout(netlogon_pipe, 35000);
 644
 645         if (our_domain->active_directory) {
 646                 struct netr_DsRGetDCNameInfo *domain_info = NULL;
 647
 648                 result = dcerpc_netr_DsRGetDCName(b,
 649                                                   mem_ctx,
 650                                                   our_domain->dcname,
 651                                                   domain->name,
 652                                                   NULL,
 653                                                   NULL,
 654                                                   DS_RETURN_DNS_NAME,
 655                                                   &domain_info,
 656                                                   &werr);
 657                 if (NT_STATUS_IS_OK(result) && W_ERROR_IS_OK(werr)) {
 658                         tmp = talloc_strdup(
 659                                 mem_ctx, domain_info->dc_unc);
 660                         if (tmp == NULL) {
 661                                 DEBUG(0, ("talloc_strdup failed\n"));
 662                                 talloc_destroy(mem_ctx);
 663                                 return false;
 664                         }
 665                         if (strlen(domain->alt_name) == 0) {
 666                                 fstrcpy(domain->alt_name,
 667                                         domain_info->domain_name);
 668                         }
 669                         if (strlen(domain->forest_name) == 0) {
 670                                 fstrcpy(domain->forest_name,
 671                                         domain_info->forest_name);
 672                         }
 673                 }
 674         } else {
 675                 result = dcerpc_netr_GetAnyDCName(b, mem_ctx,
 676                                                   our_domain->dcname,
 677                                                   domain->name,
 678                                                   &tmp,
 679                                                   &werr);
 680         }
 681
 682         /* And restore our original timeout. */
 683         rpccli_set_timeout(netlogon_pipe, orig_timeout);
 684
 685         if (!NT_STATUS_IS_OK(result)) {
 686                 DEBUG(10,("dcerpc_netr_GetAnyDCName failed: %s\n",
 687                         nt_errstr(result)));
 688                 talloc_destroy(mem_ctx);
 689                 return false;
 690         }
 691
 692         if (!W_ERROR_IS_OK(werr)) {
 693                 DEBUG(10,("dcerpc_netr_GetAnyDCName failed: %s\n",
 694                            win_errstr(werr)));
 695                 talloc_destroy(mem_ctx);
 696                 return false;
 697         }
 698
 699         /* dcerpc_netr_GetAnyDCName gives us a name with \\ */
 700         p = strip_hostname(tmp);
 701
 702         fstrcpy(dcname, p);
 703
 704         talloc_destroy(mem_ctx);
 705
 706         DEBUG(10,("dcerpc_netr_GetAnyDCName returned %s\n", dcname));
 707
 708         if (!resolve_name(dcname, dc_ss, 0x20, true)) {
 709                 return False;
 710         }
 711
 712         return True;
 713 }
 714
 715 /**
 716  * Helper function to assemble trust password and account name
 717  */
 718 static NTSTATUS get_trust_creds(const struct winbindd_domain *domain,
 719                                 char **machine_password,
 720                                 char **machine_account,
 721                                 char **machine_krb5_principal)
 722 {
 723         const char *account_name;
 724         const char *name = NULL;
 725
 726         /* If we are a DC and this is not our own domain */
 727
 728         if (IS_DC) {
 729                 name = domain->name;
 730         } else {
 731                 struct winbindd_domain *our_domain = find_our_domain();
 732
 733                 if (!our_domain)
 734                         return NT_STATUS_INVALID_SERVER_STATE;
 735
 736                 name = our_domain->name;
 737         }
 738
 739         if (!get_trust_pw_clear(name, machine_password,
 740                                 &account_name, NULL))
 741         {
 742                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 743         }
 744
 745         if ((machine_account != NULL) &&
 746             (asprintf(machine_account, "%s$", account_name) == -1))
 747         {
 748                 return NT_STATUS_NO_MEMORY;
 749         }
 750
 751         /* For now assume our machine account only exists in our domain */
 752
 753         if (machine_krb5_principal != NULL)
 754         {
 755                 struct winbindd_domain *our_domain = find_our_domain();
 756
 757                 if (!our_domain) {
 758                         return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
 759                 }
 760
 761                 if (asprintf(machine_krb5_principal, "%s$@%s",
 762                              account_name, our_domain->alt_name) == -1)
 763                 {
 764                         return NT_STATUS_NO_MEMORY;
 765                 }
 766
 767                 strupper_m(*machine_krb5_principal);
 768         }
 769
 770         return NT_STATUS_OK;
 771 }
 772
 773 /************************************************************************
 774  Given a fd with a just-connected TCP connection to a DC, open a connection
 775  to the pipe.
 776 ************************************************************************/
 777
 778 static NTSTATUS cm_prepare_connection(const struct winbindd_domain *domain,
 779                                       const int sockfd,
 780                                       const char *controller,
 781                                       struct cli_state **cli,
 782                                       bool *retry)
 783 {
 784         char *machine_password = NULL;
 785         char *machine_krb5_principal = NULL;
 786         char *machine_account = NULL;
 787         char *ipc_username = NULL;
 788         char *ipc_domain = NULL;
 789         char *ipc_password = NULL;
 790
 791         struct named_mutex *mutex;
 792
 793         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
 794
 795         struct sockaddr peeraddr;
 796         socklen_t peeraddr_len;
 797
 798         struct sockaddr_in *peeraddr_in =
 799                 (struct sockaddr_in *)(void *)&peeraddr;
 800
 801         DEBUG(10,("cm_prepare_connection: connecting to DC %s for domain %s\n",
 802                 controller, domain->name ));
 803
 804         *retry = True;
 805
 806         mutex = grab_named_mutex(talloc_tos(), controller,
 807                                  WINBIND_SERVER_MUTEX_WAIT_TIME);
 808         if (mutex == NULL) {
 809                 DEBUG(0,("cm_prepare_connection: mutex grab failed for %s\n",
 810                          controller));
 811                 result = NT_STATUS_POSSIBLE_DEADLOCK;
 812                 goto done;
 813         }
 814
 815         if ((*cli = cli_initialise()) == NULL) {
 816                 DEBUG(1, ("Could not cli_initialize\n"));
 817                 result = NT_STATUS_NO_MEMORY;
 818                 goto done;
 819         }
 820
 821         (*cli)->timeout = 10000;        /* 10 seconds */
 822         (*cli)->fd = sockfd;
 823         (*cli)->desthost = talloc_strdup((*cli), controller);
 824         if ((*cli)->desthost == NULL) {
 825                 result = NT_STATUS_NO_MEMORY;
 826                 goto done;
 827         }
 828
 829         (*cli)->use_kerberos = True;
 830
 831         peeraddr_len = sizeof(peeraddr);
 832
 833         if ((getpeername((*cli)->fd, &peeraddr, &peeraddr_len) != 0)) {
 834                 DEBUG(0,("cm_prepare_connection: getpeername failed with: %s\n",
 835                         strerror(errno)));
 836                 result = NT_STATUS_UNSUCCESSFUL;
 837                 goto done;
 838         }
 839
 840         if ((peeraddr_len != sizeof(struct sockaddr_in))
 841 #ifdef HAVE_IPV6
 842             && (peeraddr_len != sizeof(struct sockaddr_in6))
 843 #endif
 844             ) {
 845                 DEBUG(0,("cm_prepare_connection: got unexpected peeraddr len %d\n",
 846                         peeraddr_len));
 847                 result = NT_STATUS_UNSUCCESSFUL;
 848                 goto done;
 849         }
 850
 851         if ((peeraddr_in->sin_family != PF_INET)
 852 #ifdef HAVE_IPV6
 853             && (peeraddr_in->sin_family != PF_INET6)
 854 #endif
 855             ) {
 856                 DEBUG(0,("cm_prepare_connection: got unexpected family %d\n",
 857                         peeraddr_in->sin_family));
 858                 result = NT_STATUS_UNSUCCESSFUL;
 859                 goto done;
 860         }
 861
 862         result = cli_negprot(*cli);
 863
 864         if (!NT_STATUS_IS_OK(result)) {
 865                 DEBUG(1, ("cli_negprot failed: %s\n", nt_errstr(result)));
 866                 goto done;
 867         }
 868
 869         if (!is_dc_trusted_domain_situation(domain->name) &&
 870             (*cli)->protocol >= PROTOCOL_NT1 &&
 871             (*cli)->capabilities & CAP_EXTENDED_SECURITY)
 872         {
 873                 ADS_STATUS ads_status;
 874
 875                 result = get_trust_creds(domain, &machine_password,
 876                                          &machine_account,
 877                                          &machine_krb5_principal);
 878                 if (!NT_STATUS_IS_OK(result)) {
 879                         goto anon_fallback;
 880                 }
 881
 882                 if (lp_security() == SEC_ADS) {
 883
 884                         /* Try a krb5 session */
 885
 886                         (*cli)->use_kerberos = True;
 887                         DEBUG(5, ("connecting to %s from %s with kerberos principal "
 888                                   "[%s] and realm [%s]\n", controller, lp_netbios_name(),
 889                                   machine_krb5_principal, domain->alt_name));
 890
 891                         winbindd_set_locator_kdc_envs(domain);
 892
 893                         ads_status = cli_session_setup_spnego(*cli,
 894                                                               machine_krb5_principal,
 895                                                               machine_password,
 896                                                               lp_workgroup(),
 897                                                               domain->alt_name);
 898
 899                         if (!ADS_ERR_OK(ads_status)) {
 900                                 DEBUG(4,("failed kerberos session setup with %s\n",
 901                                          ads_errstr(ads_status)));
 902                         }
 903
 904                         result = ads_ntstatus(ads_status);
 905                         if (NT_STATUS_IS_OK(result)) {
 906                                 /* Ensure creds are stored for NTLMSSP authenticated pipe access. */
 907                                 result = cli_init_creds(*cli, machine_account, lp_workgroup(), machine_password);
 908                                 if (!NT_STATUS_IS_OK(result)) {
 909                                         goto done;
 910                                 }
 911                                 goto session_setup_done;
 912                         }
 913                 }
 914
 915                 /* Fall back to non-kerberos session setup using NTLMSSP SPNEGO with the machine account. */
 916                 (*cli)->use_kerberos = False;
 917
 918                 DEBUG(5, ("connecting to %s from %s with username "
 919                           "[%s]\\[%s]\n",  controller, lp_netbios_name(),
 920                           lp_workgroup(), machine_account));
 921
 922                 ads_status = cli_session_setup_spnego(*cli,
 923                                                       machine_account,
 924                                                       machine_password,
 925                                                       lp_workgroup(),
 926                                                       NULL);
 927                 if (!ADS_ERR_OK(ads_status)) {
 928                         DEBUG(4, ("authenticated session setup failed with %s\n",
 929                                 ads_errstr(ads_status)));
 930                 }
 931
 932                 result = ads_ntstatus(ads_status);
 933                 if (NT_STATUS_IS_OK(result)) {
 934                         /* Ensure creds are stored for NTLMSSP authenticated pipe access. */
 935                         result = cli_init_creds(*cli, machine_account, lp_workgroup(), machine_password);
 936                         if (!NT_STATUS_IS_OK(result)) {
 937                                 goto done;
 938                         }
 939                         goto session_setup_done;
 940                 }
 941         }
 942
 943         /* Fall back to non-kerberos session setup with auth_user */
 944
 945         (*cli)->use_kerberos = False;
 946
 947         cm_get_ipc_userpass(&ipc_username, &ipc_domain, &ipc_password);
 948
 949         if ((((*cli)->sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) != 0) &&
 950             (strlen(ipc_username) > 0)) {
 951
 952                 /* Only try authenticated if we have a username */
 953
 954                 DEBUG(5, ("connecting to %s from %s with username "
 955                           "[%s]\\[%s]\n",  controller, lp_netbios_name(),
 956                           ipc_domain, ipc_username));
 957
 958                 if (NT_STATUS_IS_OK(cli_session_setup(
 959                                             *cli, ipc_username,
 960                                             ipc_password, strlen(ipc_password)+1,
 961                                             ipc_password, strlen(ipc_password)+1,
 962                                             ipc_domain))) {
 963                         /* Successful logon with given username. */
 964                         result = cli_init_creds(*cli, ipc_username, ipc_domain, ipc_password);
 965                         if (!NT_STATUS_IS_OK(result)) {
 966                                 goto done;
 967                         }
 968                         goto session_setup_done;
 969                 } else {
 970                         DEBUG(4, ("authenticated session setup with user %s\\%s failed.\n",
 971                                 ipc_domain, ipc_username ));
 972                 }
 973         }
 974
 975  anon_fallback:
 976
 977         /* Fall back to anonymous connection, this might fail later */
 978         DEBUG(10,("cm_prepare_connection: falling back to anonymous "
 979                 "connection for DC %s\n",
 980                 controller ));
 981
 982         if (NT_STATUS_IS_OK(cli_session_setup(*cli, "", NULL, 0,
 983                                               NULL, 0, ""))) {
 984                 DEBUG(5, ("Connected anonymously\n"));
 985                 result = cli_init_creds(*cli, "", "", "");
 986                 if (!NT_STATUS_IS_OK(result)) {
 987                         goto done;
 988                 }
 989                 goto session_setup_done;
 990         }
 991
 992         result = cli_nt_error(*cli);
 993
 994         if (NT_STATUS_IS_OK(result))
 995                 result = NT_STATUS_UNSUCCESSFUL;
 996
 997         /* We can't session setup */
 998
 999         goto done;
1000
1001  session_setup_done:
1002
1003         /* cache the server name for later connections */
1004
1005         saf_store( domain->name, (*cli)->desthost );
1006         if (domain->alt_name && (*cli)->use_kerberos) {
1007                 saf_store( domain->alt_name, (*cli)->desthost );
1008         }
1009
1010         winbindd_set_locator_kdc_envs(domain);
1011
1012         result = cli_tcon_andx(*cli, "IPC$", "IPC", "", 0);
1013
1014         if (!NT_STATUS_IS_OK(result)) {
1015                 DEBUG(1,("failed tcon_X with %s\n", nt_errstr(result)));
1016                 goto done;
1017         }
1018
1019         TALLOC_FREE(mutex);
1020         *retry = False;
1021
1022         /* set the domain if empty; needed for schannel connections */
1023         if ( !(*cli)->domain[0] ) {
1024                 result = cli_set_domain((*cli), domain->name);
1025                 if (!NT_STATUS_IS_OK(result)) {
1026                         return result;
1027                 }
1028         }
1029
1030         result = NT_STATUS_OK;
1031
1032  done:
1033         TALLOC_FREE(mutex);
1034         SAFE_FREE(machine_account);
1035         SAFE_FREE(machine_password);
1036         SAFE_FREE(machine_krb5_principal);
1037         SAFE_FREE(ipc_username);
1038         SAFE_FREE(ipc_domain);
1039         SAFE_FREE(ipc_password);
1040
1041         if (!NT_STATUS_IS_OK(result)) {
1042                 winbind_add_failed_connection_entry(domain, controller, result);
1043                 if ((*cli) != NULL) {
1044                         cli_shutdown(*cli);
1045                         *cli = NULL;
1046                 }
1047         }
1048
1049         return result;
1050 }
1051
1052 /*******************************************************************
1053  Add a dcname and sockaddr_storage pair to the end of a dc_name_ip
1054  array.
1055
1056  Keeps the list unique by not adding duplicate entries.
1057
1058  @param[in] mem_ctx talloc memory context to allocate from
1059  @param[in] domain_name domain of the DC
1060  @param[in] dcname name of the DC to add to the list
1061  @param[in] pss Internet address and port pair to add to the list
1062  @param[in,out] dcs array of dc_name_ip structures to add to
1063  @param[in,out] num_dcs number of dcs returned in the dcs array
1064  @return true if the list was added to, false otherwise
1065 *******************************************************************/
1066
1067 static bool add_one_dc_unique(TALLOC_CTX *mem_ctx, const char *domain_name,
1068                               const char *dcname, struct sockaddr_storage *pss,
1069                               struct dc_name_ip **dcs, int *num)
1070 {
1071         int i = 0;
1072
1073         if (!NT_STATUS_IS_OK(check_negative_conn_cache(domain_name, dcname))) {
1074                 DEBUG(10, ("DC %s was in the negative conn cache\n", dcname));
1075                 return False;
1076         }
1077
1078         /* Make sure there's no duplicates in the list */
1079         for (i=0; i<*num; i++)
1080                 if (sockaddr_equal(
1081                             (struct sockaddr *)(void *)&(*dcs)[i].ss,
1082                             (struct sockaddr *)(void *)pss))
1083                         return False;
1084
1085         *dcs = talloc_realloc(mem_ctx, *dcs, struct dc_name_ip, (*num)+1);
1086
1087         if (*dcs == NULL)
1088                 return False;
1089
1090         fstrcpy((*dcs)[*num].name, dcname);
1091         (*dcs)[*num].ss = *pss;
1092         *num += 1;
1093         return True;
1094 }
1095
1096 static bool add_sockaddr_to_array(TALLOC_CTX *mem_ctx,
1097                                   struct sockaddr_storage *pss, uint16 port,
1098                                   struct sockaddr_storage **addrs, int *num)
1099 {
1100         *addrs = talloc_realloc(mem_ctx, *addrs, struct sockaddr_storage, (*num)+1);
1101
1102         if (*addrs == NULL) {
1103                 *num = 0;
1104                 return False;
1105         }
1106
1107         (*addrs)[*num] = *pss;
1108         set_sockaddr_port((struct sockaddr *)&(*addrs)[*num], port);
1109
1110         *num += 1;
1111         return True;
1112 }
1113
1114 /*******************************************************************
1115  convert an ip to a name
1116 *******************************************************************/
1117
1118 static bool dcip_to_name(TALLOC_CTX *mem_ctx,
1119                 const struct winbindd_domain *domain,
1120                 struct sockaddr_storage *pss,
1121                 fstring name )
1122 {
1123         struct ip_service ip_list;
1124         uint32_t nt_version = NETLOGON_NT_VERSION_1;
1125         NTSTATUS status;
1126         const char *dc_name;
1127
1128         ip_list.ss = *pss;
1129         ip_list.port = 0;
1130
1131 #ifdef HAVE_ADS
1132         /* For active directory servers, try to get the ldap server name.
1133            None of these failures should be considered critical for now */
1134
1135         if (lp_security() == SEC_ADS) {
1136                 ADS_STRUCT *ads;
1137                 ADS_STATUS ads_status;
1138                 char addr[INET6_ADDRSTRLEN];
1139
1140                 print_sockaddr(addr, sizeof(addr), pss);
1141
1142                 ads = ads_init(domain->alt_name, domain->name, addr);
1143                 ads->auth.flags |= ADS_AUTH_NO_BIND;
1144
1145                 ads_status = ads_connect(ads);
1146                 if (ADS_ERR_OK(ads_status)) {
1147                         /* We got a cldap packet. */
1148                         fstrcpy(name, ads->config.ldap_server_name);
1149                         namecache_store(name, 0x20, 1, &ip_list);
1150
1151                         DEBUG(10,("dcip_to_name: flags = 0x%x\n", (unsigned int)ads->config.flags));
1152
1153                         if (domain->primary && (ads->config.flags & NBT_SERVER_KDC)) {
1154                                 if (ads_closest_dc(ads)) {
1155                                         char *sitename = sitename_fetch(ads->config.realm);
1156
1157                                         /* We're going to use this KDC for this realm/domain.
1158                                            If we are using sites, then force the krb5 libs
1159                                            to use this KDC. */
1160
1161                                         create_local_private_krb5_conf_for_domain(domain->alt_name,
1162                                                                         domain->name,
1163                                                                         sitename,
1164                                                                         pss,
1165                                                                         name);
1166
1167                                         SAFE_FREE(sitename);
1168                                 } else {
1169                                         /* use an off site KDC */
1170                                         create_local_private_krb5_conf_for_domain(domain->alt_name,
1171                                                                         domain->name,
1172                                                                         NULL,
1173                                                                         pss,
1174                                                                         name);
1175                                 }
1176                                 winbindd_set_locator_kdc_envs(domain);
1177
1178                                 /* Ensure we contact this DC also. */
1179                                 saf_store( domain->name, name);
1180                                 saf_store( domain->alt_name, name);
1181                         }
1182
1183                         ads_destroy( &ads );
1184                         return True;
1185                 }
1186
1187                 ads_destroy( &ads );
1188         }
1189 #endif
1190
1191         status = nbt_getdc(winbind_messaging_context(), pss, domain->name,
1192                            &domain->sid, nt_version, mem_ctx, &nt_version,
1193                            &dc_name, NULL);
1194         if (NT_STATUS_IS_OK(status)) {
1195                 fstrcpy(name, dc_name);
1196                 namecache_store(name, 0x20, 1, &ip_list);
1197                 return True;
1198         }
1199
1200         /* try node status request */
1201
1202         if ( name_status_find(domain->name, 0x1c, 0x20, pss, name) ) {
1203                 namecache_store(name, 0x20, 1, &ip_list);
1204                 return True;
1205         }
1206         return False;
1207 }
1208
1209 /*******************************************************************
1210  Retrieve a list of IP addresses for domain controllers.
1211
1212  The array is sorted in the preferred connection order.
1213
1214  @param[in] mem_ctx talloc memory context to allocate from
1215  @param[in] domain domain to retrieve DCs for
1216  @param[out] dcs array of dcs that will be returned
1217  @param[out] num_dcs number of dcs returned in the dcs array
1218  @return always true
1219 *******************************************************************/
1220
1221 static bool get_dcs(TALLOC_CTX *mem_ctx, struct winbindd_domain *domain,
1222                     struct dc_name_ip **dcs, int *num_dcs)
1223 {
1224         fstring dcname;
1225         struct  sockaddr_storage ss;
1226         struct  ip_service *ip_list = NULL;
1227         int     iplist_size = 0;
1228         int     i;
1229         bool    is_our_domain;
1230         enum security_types sec = (enum security_types)lp_security();
1231
1232         is_our_domain = strequal(domain->name, lp_workgroup());
1233
1234         /* If not our domain, get the preferred DC, by asking our primary DC */
1235         if ( !is_our_domain
1236                 && get_dc_name_via_netlogon(domain, dcname, &ss)
1237                 && add_one_dc_unique(mem_ctx, domain->name, dcname, &ss, dcs,
1238                        num_dcs) )
1239         {
1240                 char addr[INET6_ADDRSTRLEN];
1241                 print_sockaddr(addr, sizeof(addr), &ss);
1242                 DEBUG(10, ("Retrieved DC %s at %s via netlogon\n",
1243                            dcname, addr));
1244                 return True;
1245         }
1246
1247         if (sec == SEC_ADS) {
1248                 char *sitename = NULL;
1249
1250                 /* We need to make sure we know the local site before
1251                    doing any DNS queries, as this will restrict the
1252                    get_sorted_dc_list() call below to only fetching
1253                    DNS records for the correct site. */
1254
1255                 /* Find any DC to get the site record.
1256                    We deliberately don't care about the
1257                    return here. */
1258
1259                 get_dc_name(domain->name, domain->alt_name, dcname, &ss);
1260
1261                 sitename = sitename_fetch(domain->alt_name);
1262                 if (sitename) {
1263
1264                         /* Do the site-specific AD dns lookup first. */
1265                         get_sorted_dc_list(domain->alt_name, sitename, &ip_list,
1266                                &iplist_size, True);
1267
1268                         /* Add ips to the DC array.  We don't look up the name
1269                            of the DC in this function, but we fill in the char*
1270                            of the ip now to make the failed connection cache
1271                            work */
1272                         for ( i=0; i<iplist_size; i++ ) {
1273                                 char addr[INET6_ADDRSTRLEN];
1274                                 print_sockaddr(addr, sizeof(addr),
1275                                                 &ip_list[i].ss);
1276                                 add_one_dc_unique(mem_ctx,
1277                                                 domain->name,
1278                                                 addr,
1279                                                 &ip_list[i].ss,
1280                                                 dcs,
1281                                                 num_dcs);
1282                         }
1283
1284                         SAFE_FREE(ip_list);
1285                         SAFE_FREE(sitename);
1286                         iplist_size = 0;
1287                 }
1288
1289                 /* Now we add DCs from the main AD DNS lookup. */
1290                 get_sorted_dc_list(domain->alt_name, NULL, &ip_list,
1291                         &iplist_size, True);
1292
1293                 for ( i=0; i<iplist_size; i++ ) {
1294                         char addr[INET6_ADDRSTRLEN];
1295                         print_sockaddr(addr, sizeof(addr),
1296                                         &ip_list[i].ss);
1297                         add_one_dc_unique(mem_ctx,
1298                                         domain->name,
1299                                         addr,
1300                                         &ip_list[i].ss,
1301                                         dcs,
1302                                         num_dcs);
1303                 }
1304
1305                 SAFE_FREE(ip_list);
1306                 iplist_size = 0;
1307         }
1308
1309         /* Try standard netbios queries if no ADS */
1310         if (*num_dcs == 0) {
1311                 get_sorted_dc_list(domain->name, NULL, &ip_list, &iplist_size,
1312                        False);
1313
1314                 for ( i=0; i<iplist_size; i++ ) {
1315                         char addr[INET6_ADDRSTRLEN];
1316                         print_sockaddr(addr, sizeof(addr),
1317                                         &ip_list[i].ss);
1318                         add_one_dc_unique(mem_ctx,
1319                                         domain->name,
1320                                         addr,
1321                                         &ip_list[i].ss,
1322                                         dcs,
1323                                         num_dcs);
1324                 }
1325
1326                 SAFE_FREE(ip_list);
1327                 iplist_size = 0;
1328         }
1329
1330         return True;
1331 }
1332
1333 /*******************************************************************
1334  Find and make a connection to a DC in the given domain.
1335
1336  @param[in] mem_ctx talloc memory context to allocate from
1337  @param[in] domain domain to find a dc in
1338  @param[out] dcname NetBIOS or FQDN of DC that's connected to
1339  @param[out] pss DC Internet address and port
1340  @param[out] fd fd of the open socket connected to the newly found dc
1341  @return true when a DC connection is made, false otherwise
1342 *******************************************************************/
1343
1344 static bool find_new_dc(TALLOC_CTX *mem_ctx,
1345                         struct winbindd_domain *domain,
1346                         fstring dcname, struct sockaddr_storage *pss, int *fd)
1347 {
1348         struct dc_name_ip *dcs = NULL;
1349         int num_dcs = 0;
1350
1351         const char **dcnames = NULL;
1352         int num_dcnames = 0;
1353
1354         struct sockaddr_storage *addrs = NULL;
1355         int num_addrs = 0;
1356
1357         int i;
1358         size_t fd_index;
1359
1360         NTSTATUS status;
1361
1362         *fd = -1;
1363
1364  again:
1365         if (!get_dcs(mem_ctx, domain, &dcs, &num_dcs) || (num_dcs == 0))
1366                 return False;
1367
1368         for (i=0; i<num_dcs; i++) {
1369
1370                 if (!add_string_to_array(mem_ctx, dcs[i].name,
1371                                     &dcnames, &num_dcnames)) {
1372                         return False;
1373                 }
1374                 if (!add_sockaddr_to_array(mem_ctx, &dcs[i].ss, 445,
1375                                       &addrs, &num_addrs)) {
1376                         return False;
1377                 }
1378         }
1379
1380         if ((num_dcnames == 0) || (num_dcnames != num_addrs))
1381                 return False;
1382
1383         if ((addrs == NULL) || (dcnames == NULL))
1384                 return False;
1385
1386         status = smbsock_any_connect(addrs, dcnames, NULL, NULL, NULL,
1387                                      num_addrs, 0, 10, fd, &fd_index, NULL);
1388         if (!NT_STATUS_IS_OK(status)) {
1389                 for (i=0; i<num_dcs; i++) {
1390                         char ab[INET6_ADDRSTRLEN];
1391                         print_sockaddr(ab, sizeof(ab), &dcs[i].ss);
1392                         DEBUG(10, ("find_new_dc: smbsock_any_connect failed for "
1393                                 "domain %s address %s. Error was %s\n",
1394                                    domain->name, ab, nt_errstr(status) ));
1395                         winbind_add_failed_connection_entry(domain,
1396                                 dcs[i].name, NT_STATUS_UNSUCCESSFUL);
1397                 }
1398                 return False;
1399         }
1400
1401         *pss = addrs[fd_index];
1402
1403         if (*dcnames[fd_index] != '\0' && !is_ipaddress(dcnames[fd_index])) {
1404                 /* Ok, we've got a name for the DC */
1405                 fstrcpy(dcname, dcnames[fd_index]);
1406                 return True;
1407         }
1408
1409         /* Try to figure out the name */
1410         if (dcip_to_name(mem_ctx, domain, pss, dcname)) {
1411                 return True;
1412         }
1413
1414         /* We can not continue without the DC's name */
1415         winbind_add_failed_connection_entry(domain, dcs[fd_index].name,
1416                                     NT_STATUS_UNSUCCESSFUL);
1417
1418         /* Throw away all arrays as we're doing this again. */
1419         TALLOC_FREE(dcs);
1420         num_dcs = 0;
1421
1422         TALLOC_FREE(dcnames);
1423         num_dcnames = 0;
1424
1425         TALLOC_FREE(addrs);
1426         num_addrs = 0;
1427
1428         close(*fd);
1429         *fd = -1;
1430
1431         goto again;
1432 }
1433
1434 static char *current_dc_key(TALLOC_CTX *mem_ctx, const char *domain_name)
1435 {
1436         return talloc_asprintf_strupper_m(mem_ctx, "CURRENT_DCNAME/%s",
1437                                           domain_name);
1438 }
1439
1440 static void store_current_dc_in_gencache(const char *domain_name,
1441                                          const char *dc_name,
1442                                          struct cli_state *cli)
1443 {
1444         char addr[INET6_ADDRSTRLEN];
1445         char *key = NULL;
1446         char *value = NULL;
1447
1448         if (cli == NULL) {
1449                 return;
1450         }
1451         if (cli->fd == -1) {
1452                 return;
1453         }
1454         get_peer_addr(cli->fd, addr, sizeof(addr));
1455
1456         key = current_dc_key(talloc_tos(), domain_name);
1457         if (key == NULL) {
1458                 goto done;
1459         }
1460
1461         value = talloc_asprintf(talloc_tos(), "%s %s", addr, dc_name);
1462         if (value == NULL) {
1463                 goto done;
1464         }
1465
1466         gencache_set(key, value, 0x7fffffff);
1467 done:
1468         TALLOC_FREE(value);
1469         TALLOC_FREE(key);
1470 }
1471
1472 bool fetch_current_dc_from_gencache(TALLOC_CTX *mem_ctx,
1473                                     const char *domain_name,
1474                                     char **p_dc_name, char **p_dc_ip)
1475 {
1476         char *key, *value, *p;
1477         bool ret = false;
1478         char *dc_name = NULL;
1479         char *dc_ip = NULL;
1480
1481         key = current_dc_key(talloc_tos(), domain_name);
1482         if (key == NULL) {
1483                 goto done;
1484         }
1485         if (!gencache_get(key, &value, NULL)) {
1486                 goto done;
1487         }
1488         p = strchr(value, ' ');
1489         if (p == NULL) {
1490                 goto done;
1491         }
1492         dc_ip = talloc_strndup(mem_ctx, value, p - value);
1493         if (dc_ip == NULL) {
1494                 goto done;
1495         }
1496         dc_name = talloc_strdup(mem_ctx, p+1);
1497         if (dc_name == NULL) {
1498                 goto done;
1499         }
1500
1501         if (p_dc_ip != NULL) {
1502                 *p_dc_ip = dc_ip;
1503                 dc_ip = NULL;
1504         }
1505         if (p_dc_name != NULL) {
1506                 *p_dc_name = dc_name;
1507                 dc_name = NULL;
1508         }
1509         ret = true;
1510 done:
1511         TALLOC_FREE(dc_name);
1512         TALLOC_FREE(dc_ip);
1513         TALLOC_FREE(key);
1514         return ret;
1515 }
1516
1517 static NTSTATUS cm_open_connection(struct winbindd_domain *domain,
1518                                    struct winbindd_cm_conn *new_conn)
1519 {
1520         TALLOC_CTX *mem_ctx;
1521         NTSTATUS result;
1522         char *saf_servername = saf_fetch( domain->name );
1523         int retries;
1524
1525         if ((mem_ctx = talloc_init("cm_open_connection")) == NULL) {
1526                 SAFE_FREE(saf_servername);
1527                 set_domain_offline(domain);
1528                 return NT_STATUS_NO_MEMORY;
1529         }
1530
1531         /* we have to check the server affinity cache here since
1532            later we select a DC based on response time and not preference */
1533
1534         /* Check the negative connection cache
1535            before talking to it. It going down may have
1536            triggered the reconnection. */
1537
1538         if ( saf_servername && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, saf_servername))) {
1539
1540                 DEBUG(10,("cm_open_connection: saf_servername is '%s' for domain %s\n",
1541                         saf_servername, domain->name ));
1542
1543                 /* convert an ip address to a name */
1544                 if (is_ipaddress( saf_servername ) ) {
1545                         fstring saf_name;
1546                         struct sockaddr_storage ss;
1547
1548                         if (!interpret_string_addr(&ss, saf_servername,
1549                                                 AI_NUMERICHOST)) {
1550                                 return NT_STATUS_UNSUCCESSFUL;
1551                         }
1552                         if (dcip_to_name(mem_ctx, domain, &ss, saf_name )) {
1553                                 strlcpy(domain->dcname, saf_name, sizeof(domain->dcname));
1554                         } else {
1555                                 winbind_add_failed_connection_entry(
1556                                         domain, saf_servername,
1557                                         NT_STATUS_UNSUCCESSFUL);
1558                         }
1559                 } else {
1560                         fstrcpy( domain->dcname, saf_servername );
1561                 }
1562
1563                 SAFE_FREE( saf_servername );
1564         }
1565
1566         for (retries = 0; retries < 3; retries++) {
1567                 int fd = -1;
1568                 bool retry = False;
1569
1570                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1571
1572                 DEBUG(10,("cm_open_connection: dcname is '%s' for domain %s\n",
1573                         domain->dcname, domain->name ));
1574
1575                 if (*domain->dcname
1576                         && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, domain->dcname))
1577                         && (resolve_name(domain->dcname, &domain->dcaddr, 0x20, true)))
1578                 {
1579                         NTSTATUS status;
1580
1581                         status = smbsock_connect(&domain->dcaddr, 0,
1582                                                  NULL, -1, NULL, -1,
1583                                                  &fd, NULL, 10);
1584                         if (!NT_STATUS_IS_OK(status)) {
1585                                 fd = -1;
1586                         }
1587                 }
1588
1589                 if ((fd == -1)
1590                         && !find_new_dc(mem_ctx, domain, domain->dcname, &domain->dcaddr, &fd))
1591                 {
1592                         /* This is the one place where we will
1593                            set the global winbindd offline state
1594                            to true, if a "WINBINDD_OFFLINE" entry
1595                            is found in the winbindd cache. */
1596                         set_global_winbindd_state_offline();
1597                         break;
1598                 }
1599
1600                 new_conn->cli = NULL;
1601
1602                 result = cm_prepare_connection(domain, fd, domain->dcname,
1603                         &new_conn->cli, &retry);
1604
1605                 if (!retry)
1606                         break;
1607         }
1608
1609         if (NT_STATUS_IS_OK(result)) {
1610
1611                 winbindd_set_locator_kdc_envs(domain);
1612
1613                 if (domain->online == False) {
1614                         /* We're changing state from offline to online. */
1615                         set_global_winbindd_state_online();
1616                 }
1617                 set_domain_online(domain);
1618
1619                 /*
1620                  * Much as I hate global state, this seems to be the point
1621                  * where we can be certain that we have a proper connection to
1622                  * a DC. wbinfo --dc-info needs that information, store it in
1623                  * gencache with a looong timeout. This will need revisiting
1624                  * once we start to connect to multiple DCs, wbcDcInfo is
1625                  * already prepared for that.
1626                  */
1627                 store_current_dc_in_gencache(domain->name, domain->dcname,
1628                                              new_conn->cli);
1629         } else {
1630                 /* Ensure we setup the retry handler. */
1631                 set_domain_offline(domain);
1632         }
1633
1634         talloc_destroy(mem_ctx);
1635         return result;
1636 }
1637
1638 /* Close down all open pipes on a connection. */
1639
1640 void invalidate_cm_connection(struct winbindd_cm_conn *conn)
1641 {
1642         NTSTATUS result;
1643
1644         /* We're closing down a possibly dead
1645            connection. Don't have impossibly long (10s) timeouts. */
1646
1647         if (conn->cli) {
1648                 cli_set_timeout(conn->cli, 1000); /* 1 second. */
1649         }
1650
1651         if (conn->samr_pipe != NULL) {
1652                 if (is_valid_policy_hnd(&conn->sam_connect_handle)) {
1653                         dcerpc_samr_Close(conn->samr_pipe->binding_handle,
1654                                           talloc_tos(),
1655                                           &conn->sam_connect_handle,
1656                                           &result);
1657                 }
1658                 TALLOC_FREE(conn->samr_pipe);
1659                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1660                 if (conn->cli) {
1661                         cli_set_timeout(conn->cli, 500);
1662                 }
1663         }
1664
1665         if (conn->lsa_pipe != NULL) {
1666                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1667                         dcerpc_lsa_Close(conn->lsa_pipe->binding_handle,
1668                                          talloc_tos(),
1669                                          &conn->lsa_policy,
1670                                          &result);
1671                 }
1672                 TALLOC_FREE(conn->lsa_pipe);
1673                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1674                 if (conn->cli) {
1675                         cli_set_timeout(conn->cli, 500);
1676                 }
1677         }
1678
1679         if (conn->lsa_pipe_tcp != NULL) {
1680                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1681                         dcerpc_lsa_Close(conn->lsa_pipe_tcp->binding_handle,
1682                                          talloc_tos(),
1683                                          &conn->lsa_policy,
1684                                          &result);
1685                 }
1686                 TALLOC_FREE(conn->lsa_pipe_tcp);
1687                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1688                 if (conn->cli) {
1689                         cli_set_timeout(conn->cli, 500);
1690                 }
1691         }
1692
1693         if (conn->netlogon_pipe != NULL) {
1694                 TALLOC_FREE(conn->netlogon_pipe);
1695                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1696                 if (conn->cli) {
1697                         cli_set_timeout(conn->cli, 500);
1698                 }
1699         }
1700
1701         if (conn->cli) {
1702                 cli_shutdown(conn->cli);
1703         }
1704
1705         conn->cli = NULL;
1706 }
1707
1708 void close_conns_after_fork(void)
1709 {
1710         struct winbindd_domain *domain;
1711         struct winbindd_cli_state *cli_state;
1712
1713         for (domain = domain_list(); domain; domain = domain->next) {
1714                 struct cli_state *cli = domain->conn.cli;
1715
1716                 /*
1717                  * first close the low level SMB TCP connection
1718                  * so that we don't generate any SMBclose
1719                  * requests in invalidate_cm_connection()
1720                  */
1721                 if (cli && cli->fd != -1) {
1722                         close(domain->conn.cli->fd);
1723                         domain->conn.cli->fd = -1;
1724                 }
1725
1726                 invalidate_cm_connection(&domain->conn);
1727         }
1728
1729         for (cli_state = winbindd_client_list();
1730              cli_state != NULL;
1731              cli_state = cli_state->next) {
1732                 if (cli_state->sock >= 0) {
1733                         close(cli_state->sock);
1734                         cli_state->sock = -1;
1735                 }
1736         }
1737 }
1738
1739 static bool connection_ok(struct winbindd_domain *domain)
1740 {
1741         bool ok;
1742
1743         ok = cli_state_is_connected(domain->conn.cli);
1744         if (!ok) {
1745                 DEBUG(3, ("connection_ok: Connection to %s for domain %s is not connected\n",
1746                           domain->dcname, domain->name));
1747                 return False;
1748         }
1749
1750         if (domain->online == False) {
1751                 DEBUG(3, ("connection_ok: Domain %s is offline\n", domain->name));
1752                 return False;
1753         }
1754
1755         return True;
1756 }
1757
1758 /* Initialize a new connection up to the RPC BIND.
1759    Bypass online status check so always does network calls. */
1760
1761 static NTSTATUS init_dc_connection_network(struct winbindd_domain *domain)
1762 {
1763         NTSTATUS result;
1764
1765         /* Internal connections never use the network. */
1766         if (domain->internal) {
1767                 domain->initialized = True;
1768                 return NT_STATUS_OK;
1769         }
1770
1771         if (!winbindd_can_contact_domain(domain)) {
1772                 invalidate_cm_connection(&domain->conn);
1773                 domain->initialized = True;
1774                 return NT_STATUS_OK;
1775         }
1776
1777         if (connection_ok(domain)) {
1778                 if (!domain->initialized) {
1779                         set_dc_type_and_flags(domain);
1780                 }
1781                 return NT_STATUS_OK;
1782         }
1783
1784         invalidate_cm_connection(&domain->conn);
1785
1786         result = cm_open_connection(domain, &domain->conn);
1787
1788         if (NT_STATUS_IS_OK(result) && !domain->initialized) {
1789                 set_dc_type_and_flags(domain);
1790         }
1791
1792         return result;
1793 }
1794
1795 NTSTATUS init_dc_connection(struct winbindd_domain *domain)
1796 {
1797         if (domain->internal) {
1798                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1799         }
1800
1801         if (domain->initialized && !domain->online) {
1802                 /* We check for online status elsewhere. */
1803                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1804         }
1805
1806         return init_dc_connection_network(domain);
1807 }
1808
1809 static NTSTATUS init_dc_connection_rpc(struct winbindd_domain *domain)
1810 {
1811         NTSTATUS status;
1812
1813         status = init_dc_connection(domain);
1814         if (!NT_STATUS_IS_OK(status)) {
1815                 return status;
1816         }
1817
1818         if (!domain->internal && domain->conn.cli == NULL) {
1819                 /* happens for trusted domains without inbound trust */
1820                 return NT_STATUS_TRUSTED_DOMAIN_FAILURE;
1821         }
1822
1823         return NT_STATUS_OK;
1824 }
1825
1826 /******************************************************************************
1827  Set the trust flags (direction and forest location) for a domain
1828 ******************************************************************************/
1829
1830 static bool set_dc_type_and_flags_trustinfo( struct winbindd_domain *domain )
1831 {
1832         struct winbindd_domain *our_domain;
1833         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
1834         WERROR werr;
1835         struct netr_DomainTrustList trusts;
1836         int i;
1837         uint32 flags = (NETR_TRUST_FLAG_IN_FOREST |
1838                         NETR_TRUST_FLAG_OUTBOUND |
1839                         NETR_TRUST_FLAG_INBOUND);
1840         struct rpc_pipe_client *cli;
1841         TALLOC_CTX *mem_ctx = NULL;
1842         struct dcerpc_binding_handle *b;
1843
1844         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s\n", domain->name ));
1845
1846         /* Our primary domain doesn't need to worry about trust flags.
1847            Force it to go through the network setup */
1848         if ( domain->primary ) {
1849                 return False;
1850         }
1851
1852         our_domain = find_our_domain();
1853
1854         if ( !connection_ok(our_domain) ) {
1855                 DEBUG(3,("set_dc_type_and_flags_trustinfo: No connection to our domain!\n"));
1856                 return False;
1857         }
1858
1859         /* This won't work unless our domain is AD */
1860
1861         if ( !our_domain->active_directory ) {
1862                 return False;
1863         }
1864
1865         /* Use DsEnumerateDomainTrusts to get us the trust direction
1866            and type */
1867
1868         result = cm_connect_netlogon(our_domain, &cli);
1869
1870         if (!NT_STATUS_IS_OK(result)) {
1871                 DEBUG(5, ("set_dc_type_and_flags_trustinfo: Could not open "
1872                           "a connection to %s for PIPE_NETLOGON (%s)\n",
1873                           domain->name, nt_errstr(result)));
1874                 return False;
1875         }
1876
1877         b = cli->binding_handle;
1878
1879         if ( (mem_ctx = talloc_init("set_dc_type_and_flags_trustinfo")) == NULL ) {
1880                 DEBUG(0,("set_dc_type_and_flags_trustinfo: talloc_init() failed!\n"));
1881                 return False;
1882         }
1883
1884         result = dcerpc_netr_DsrEnumerateDomainTrusts(b, mem_ctx,
1885                                                       cli->desthost,
1886                                                       flags,
1887                                                       &trusts,
1888                                                       &werr);
1889         if (!NT_STATUS_IS_OK(result)) {
1890                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1891                         "failed to query trusted domain list: %s\n",
1892                         nt_errstr(result)));
1893                 talloc_destroy(mem_ctx);
1894                 return false;
1895         }
1896         if (!W_ERROR_IS_OK(werr)) {
1897                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1898                         "failed to query trusted domain list: %s\n",
1899                         win_errstr(werr)));
1900                 talloc_destroy(mem_ctx);
1901                 return false;
1902         }
1903
1904         /* Now find the domain name and get the flags */
1905
1906         for ( i=0; i<trusts.count; i++ ) {
1907                 if ( strequal( domain->name, trusts.array[i].netbios_name) ) {
1908                         domain->domain_flags          = trusts.array[i].trust_flags;
1909                         domain->domain_type           = trusts.array[i].trust_type;
1910                         domain->domain_trust_attribs  = trusts.array[i].trust_attributes;
1911
1912                         if ( domain->domain_type == NETR_TRUST_TYPE_UPLEVEL )
1913                                 domain->active_directory = True;
1914
1915                         /* This flag is only set if the domain is *our*
1916                            primary domain and the primary domain is in
1917                            native mode */
1918
1919                         domain->native_mode = (domain->domain_flags & NETR_TRUST_FLAG_NATIVE);
1920
1921                         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s is %sin "
1922                                   "native mode.\n", domain->name,
1923                                   domain->native_mode ? "" : "NOT "));
1924
1925                         DEBUG(5,("set_dc_type_and_flags_trustinfo: domain %s is %s"
1926                                  "running active directory.\n", domain->name,
1927                                  domain->active_directory ? "" : "NOT "));
1928
1929
1930                         domain->initialized = True;
1931
1932                         break;
1933                 }
1934         }
1935
1936         talloc_destroy( mem_ctx );
1937
1938         return domain->initialized;
1939 }
1940
1941 /******************************************************************************
1942  We can 'sense' certain things about the DC by it's replies to certain
1943  questions.
1944
1945  This tells us if this particular remote server is Active Directory, and if it
1946  is native mode.
1947 ******************************************************************************/
1948
1949 static void set_dc_type_and_flags_connect( struct winbindd_domain *domain )
1950 {
1951         NTSTATUS status, result;
1952         WERROR werr;
1953         TALLOC_CTX              *mem_ctx = NULL;
1954         struct rpc_pipe_client  *cli = NULL;
1955         struct policy_handle pol;
1956         union dssetup_DsRoleInfo info;
1957         union lsa_PolicyInformation *lsa_info = NULL;
1958
1959         if (!connection_ok(domain)) {
1960                 return;
1961         }
1962
1963         mem_ctx = talloc_init("set_dc_type_and_flags on domain %s\n",
1964                               domain->name);
1965         if (!mem_ctx) {
1966                 DEBUG(1, ("set_dc_type_and_flags_connect: talloc_init() failed\n"));
1967                 return;
1968         }
1969
1970         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s\n", domain->name ));
1971
1972         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
1973                                           &ndr_table_dssetup.syntax_id,
1974                                           &cli);
1975
1976         if (!NT_STATUS_IS_OK(status)) {
1977                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
1978                           "PI_DSSETUP on domain %s: (%s)\n",
1979                           domain->name, nt_errstr(status)));
1980
1981                 /* if this is just a non-AD domain we need to continue
1982                  * identifying so that we can in the end return with
1983                  * domain->initialized = True - gd */
1984
1985                 goto no_dssetup;
1986         }
1987
1988         status = dcerpc_dssetup_DsRoleGetPrimaryDomainInformation(cli->binding_handle, mem_ctx,
1989                                                                   DS_ROLE_BASIC_INFORMATION,
1990                                                                   &info,
1991                                                                   &werr);
1992         TALLOC_FREE(cli);
1993
1994         if (NT_STATUS_IS_OK(status)) {
1995                 result = werror_to_ntstatus(werr);
1996         }
1997         if (!NT_STATUS_IS_OK(status)) {
1998                 DEBUG(5, ("set_dc_type_and_flags_connect: rpccli_ds_getprimarydominfo "
1999                           "on domain %s failed: (%s)\n",
2000                           domain->name, nt_errstr(status)));
2001
2002                 /* older samba3 DCs will return DCERPC_FAULT_OP_RNG_ERROR for
2003                  * every opcode on the DSSETUP pipe, continue with
2004                  * no_dssetup mode here as well to get domain->initialized
2005                  * set - gd */
2006
2007                 if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE)) {
2008                         goto no_dssetup;
2009                 }
2010
2011                 TALLOC_FREE(mem_ctx);
2012                 return;
2013         }
2014
2015         if ((info.basic.flags & DS_ROLE_PRIMARY_DS_RUNNING) &&
2016             !(info.basic.flags & DS_ROLE_PRIMARY_DS_MIXED_MODE)) {
2017                 domain->native_mode = True;
2018         } else {
2019                 domain->native_mode = False;
2020         }
2021
2022 no_dssetup:
2023         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
2024                                           &ndr_table_lsarpc.syntax_id, &cli);
2025
2026         if (!NT_STATUS_IS_OK(status)) {
2027                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
2028                           "PI_LSARPC on domain %s: (%s)\n",
2029                           domain->name, nt_errstr(status)));
2030                 TALLOC_FREE(cli);
2031                 TALLOC_FREE(mem_ctx);
2032                 return;
2033         }
2034
2035         status = rpccli_lsa_open_policy2(cli, mem_ctx, True,
2036                                          SEC_FLAG_MAXIMUM_ALLOWED, &pol);
2037
2038         if (NT_STATUS_IS_OK(status)) {
2039                 /* This particular query is exactly what Win2k clients use
2040                    to determine that the DC is active directory */
2041                 status = dcerpc_lsa_QueryInfoPolicy2(cli->binding_handle, mem_ctx,
2042                                                      &pol,
2043                                                      LSA_POLICY_INFO_DNS,
2044                                                      &lsa_info,
2045                                                      &result);
2046         }
2047
2048         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2049                 domain->active_directory = True;
2050
2051                 if (lsa_info->dns.name.string) {
2052                         fstrcpy(domain->name, lsa_info->dns.name.string);
2053                 }
2054
2055                 if (lsa_info->dns.dns_domain.string) {
2056                         fstrcpy(domain->alt_name,
2057                                 lsa_info->dns.dns_domain.string);
2058                 }
2059
2060                 /* See if we can set some domain trust flags about
2061                    ourself */
2062
2063                 if (lsa_info->dns.dns_forest.string) {
2064                         fstrcpy(domain->forest_name,
2065                                 lsa_info->dns.dns_forest.string);
2066
2067                         if (strequal(domain->forest_name, domain->alt_name)) {
2068                                 domain->domain_flags |= NETR_TRUST_FLAG_TREEROOT;
2069                         }
2070                 }
2071
2072                 if (lsa_info->dns.sid) {
2073                         sid_copy(&domain->sid, lsa_info->dns.sid);
2074                 }
2075         } else {
2076                 domain->active_directory = False;
2077
2078                 status = rpccli_lsa_open_policy(cli, mem_ctx, True,
2079                                                 SEC_FLAG_MAXIMUM_ALLOWED,
2080                                                 &pol);
2081
2082                 if (!NT_STATUS_IS_OK(status)) {
2083                         goto done;
2084                 }
2085
2086                 status = dcerpc_lsa_QueryInfoPolicy(cli->binding_handle, mem_ctx,
2087                                                     &pol,
2088                                                     LSA_POLICY_INFO_ACCOUNT_DOMAIN,
2089                                                     &lsa_info,
2090                                                     &result);
2091                 if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2092
2093                         if (lsa_info->account_domain.name.string) {
2094                                 fstrcpy(domain->name,
2095                                         lsa_info->account_domain.name.string);
2096                         }
2097
2098                         if (lsa_info->account_domain.sid) {
2099                                 sid_copy(&domain->sid, lsa_info->account_domain.sid);
2100                         }
2101                 }
2102         }
2103 done:
2104
2105         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s is %sin native mode.\n",
2106                   domain->name, domain->native_mode ? "" : "NOT "));
2107
2108         DEBUG(5,("set_dc_type_and_flags_connect: domain %s is %srunning active directory.\n",
2109                   domain->name, domain->active_directory ? "" : "NOT "));
2110
2111         domain->can_do_ncacn_ip_tcp = domain->active_directory;
2112         domain->can_do_validation6 = domain->active_directory;
2113
2114         TALLOC_FREE(cli);
2115
2116         TALLOC_FREE(mem_ctx);
2117
2118         domain->initialized = True;
2119 }
2120
2121 /**********************************************************************
2122  Set the domain_flags (trust attributes, domain operating modes, etc...
2123 ***********************************************************************/
2124
2125 static void set_dc_type_and_flags( struct winbindd_domain *domain )
2126 {
2127         /* we always have to contact our primary domain */
2128
2129         if ( domain->primary ) {
2130                 DEBUG(10,("set_dc_type_and_flags: setting up flags for "
2131                           "primary domain\n"));
2132                 set_dc_type_and_flags_connect( domain );
2133                 return;
2134         }
2135
2136         /* Use our DC to get the information if possible */
2137
2138         if ( !set_dc_type_and_flags_trustinfo( domain ) ) {
2139                 /* Otherwise, fallback to contacting the
2140                    domain directly */
2141                 set_dc_type_and_flags_connect( domain );
2142         }
2143
2144         return;
2145 }
2146
2147
2148
2149 /**********************************************************************
2150 ***********************************************************************/
2151
2152 static NTSTATUS cm_get_schannel_creds(struct winbindd_domain *domain,
2153                                    struct netlogon_creds_CredentialState **ppdc)
2154 {
2155         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2156         struct rpc_pipe_client *netlogon_pipe;
2157
2158         if (lp_client_schannel() == False) {
2159                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2160         }
2161
2162         result = cm_connect_netlogon(domain, &netlogon_pipe);
2163         if (!NT_STATUS_IS_OK(result)) {
2164                 return result;
2165         }
2166
2167         /* Return a pointer to the struct netlogon_creds_CredentialState from the
2168            netlogon pipe. */
2169
2170         if (!domain->conn.netlogon_pipe->dc) {
2171                 return NT_STATUS_INTERNAL_ERROR; /* This shouldn't happen. */
2172         }
2173
2174         *ppdc = domain->conn.netlogon_pipe->dc;
2175         return NT_STATUS_OK;
2176 }
2177
2178 NTSTATUS cm_connect_sam(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2179                         struct rpc_pipe_client **cli, struct policy_handle *sam_handle)
2180 {
2181         struct winbindd_cm_conn *conn;
2182         NTSTATUS status, result;
2183         struct netlogon_creds_CredentialState *p_creds;
2184         char *machine_password = NULL;
2185         char *machine_account = NULL;
2186         char *domain_name = NULL;
2187
2188         if (sid_check_is_domain(&domain->sid)) {
2189                 return open_internal_samr_conn(mem_ctx, domain, cli, sam_handle);
2190         }
2191
2192         status = init_dc_connection_rpc(domain);
2193         if (!NT_STATUS_IS_OK(status)) {
2194                 return status;
2195         }
2196
2197         conn = &domain->conn;
2198
2199         if (rpccli_is_connected(conn->samr_pipe)) {
2200                 goto done;
2201         }
2202
2203         TALLOC_FREE(conn->samr_pipe);
2204
2205         /*
2206          * No SAMR pipe yet. Attempt to get an NTLMSSP SPNEGO authenticated
2207          * sign and sealed pipe using the machine account password by
2208          * preference. If we can't - try schannel, if that fails, try
2209          * anonymous.
2210          */
2211
2212         if ((conn->cli->user_name[0] == '\0') ||
2213             (conn->cli->domain[0] == '\0') ||
2214             (conn->cli->password == NULL || conn->cli->password[0] == '\0'))
2215         {
2216                 status = get_trust_creds(domain, &machine_password,
2217                                          &machine_account, NULL);
2218                 if (!NT_STATUS_IS_OK(status)) {
2219                         DEBUG(10, ("cm_connect_sam: No no user available for "
2220                                    "domain %s, trying schannel\n", conn->cli->domain));
2221                         goto schannel;
2222                 }
2223                 domain_name = domain->name;
2224         } else {
2225                 machine_password = SMB_STRDUP(conn->cli->password);
2226                 machine_account = SMB_STRDUP(conn->cli->user_name);
2227                 domain_name = conn->cli->domain;
2228         }
2229
2230         if (!machine_password || !machine_account) {
2231                 status = NT_STATUS_NO_MEMORY;
2232                 goto done;
2233         }
2234
2235         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2236            authenticated SAMR pipe with sign & seal. */
2237         status = cli_rpc_pipe_open_spnego_ntlmssp(conn->cli,
2238                                                   &ndr_table_samr.syntax_id,
2239                                                   NCACN_NP,
2240                                                   DCERPC_AUTH_LEVEL_PRIVACY,
2241                                                   domain_name,
2242                                                   machine_account,
2243                                                   machine_password,
2244                                                   &conn->samr_pipe);
2245
2246         if (!NT_STATUS_IS_OK(status)) {
2247                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR "
2248                           "pipe for domain %s using NTLMSSP "
2249                           "authenticated pipe: user %s\\%s. Error was "
2250                           "%s\n", domain->name, domain_name,
2251                           machine_account, nt_errstr(status)));
2252                 goto schannel;
2253         }
2254
2255         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for "
2256                   "domain %s using NTLMSSP authenticated "
2257                   "pipe: user %s\\%s\n", domain->name,
2258                   domain_name, machine_account));
2259
2260         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2261                                       conn->samr_pipe->desthost,
2262                                       SEC_FLAG_MAXIMUM_ALLOWED,
2263                                       &conn->sam_connect_handle,
2264                                       &result);
2265         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2266                 goto open_domain;
2267         }
2268         if (NT_STATUS_IS_OK(status)) {
2269                 status = result;
2270         }
2271
2272         DEBUG(10,("cm_connect_sam: ntlmssp-sealed dcerpc_samr_Connect2 "
2273                   "failed for domain %s, error was %s. Trying schannel\n",
2274                   domain->name, nt_errstr(status) ));
2275         TALLOC_FREE(conn->samr_pipe);
2276
2277  schannel:
2278
2279         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2280
2281         status = cm_get_schannel_creds(domain, &p_creds);
2282         if (!NT_STATUS_IS_OK(status)) {
2283                 /* If this call fails - conn->cli can now be NULL ! */
2284                 DEBUG(10, ("cm_connect_sam: Could not get schannel auth info "
2285                            "for domain %s (error %s), trying anon\n",
2286                         domain->name,
2287                         nt_errstr(status) ));
2288                 goto anonymous;
2289         }
2290         status = cli_rpc_pipe_open_schannel_with_key
2291                 (conn->cli, &ndr_table_samr.syntax_id, NCACN_NP,
2292                  DCERPC_AUTH_LEVEL_PRIVACY,
2293                  domain->name, &p_creds, &conn->samr_pipe);
2294
2295         if (!NT_STATUS_IS_OK(status)) {
2296                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR pipe for "
2297                           "domain %s using schannel. Error was %s\n",
2298                           domain->name, nt_errstr(status) ));
2299                 goto anonymous;
2300         }
2301         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for domain %s using "
2302                   "schannel.\n", domain->name ));
2303
2304         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2305                                       conn->samr_pipe->desthost,
2306                                       SEC_FLAG_MAXIMUM_ALLOWED,
2307                                       &conn->sam_connect_handle,
2308                                       &result);
2309         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2310                 goto open_domain;
2311         }
2312         if (NT_STATUS_IS_OK(status)) {
2313                 status = result;
2314         }
2315         DEBUG(10,("cm_connect_sam: schannel-sealed dcerpc_samr_Connect2 failed "
2316                   "for domain %s, error was %s. Trying anonymous\n",
2317                   domain->name, nt_errstr(status) ));
2318         TALLOC_FREE(conn->samr_pipe);
2319
2320  anonymous:
2321
2322         /* Finally fall back to anonymous. */
2323         status = cli_rpc_pipe_open_noauth(conn->cli, &ndr_table_samr.syntax_id,
2324                                           &conn->samr_pipe);
2325
2326         if (!NT_STATUS_IS_OK(status)) {
2327                 goto done;
2328         }
2329
2330         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2331                                       conn->samr_pipe->desthost,
2332                                       SEC_FLAG_MAXIMUM_ALLOWED,
2333                                       &conn->sam_connect_handle,
2334                                       &result);
2335         if (!NT_STATUS_IS_OK(status)) {
2336                 DEBUG(10,("cm_connect_sam: rpccli_samr_Connect2 failed "
2337                           "for domain %s Error was %s\n",
2338                           domain->name, nt_errstr(status) ));
2339                 goto done;
2340         }
2341         if (!NT_STATUS_IS_OK(result)) {
2342                 status = result;
2343                 DEBUG(10,("cm_connect_sam: dcerpc_samr_Connect2 failed "
2344                           "for domain %s Error was %s\n",
2345                           domain->name, nt_errstr(result)));
2346                 goto done;
2347         }
2348
2349  open_domain:
2350         status = dcerpc_samr_OpenDomain(conn->samr_pipe->binding_handle,
2351                                         mem_ctx,
2352                                         &conn->sam_connect_handle,
2353                                         SEC_FLAG_MAXIMUM_ALLOWED,
2354                                         &domain->sid,
2355                                         &conn->sam_domain_handle,
2356                                         &result);
2357         if (!NT_STATUS_IS_OK(status)) {
2358                 goto done;
2359         }
2360
2361         status = result;
2362  done:
2363
2364         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
2365                 /*
2366                  * if we got access denied, we might just have no access rights
2367                  * to talk to the remote samr server server (e.g. when we are a
2368                  * PDC and we are connecting a w2k8 pdc via an interdomain
2369                  * trust). In that case do not invalidate the whole connection
2370                  * stack
2371                  */
2372                 TALLOC_FREE(conn->samr_pipe);
2373                 ZERO_STRUCT(conn->sam_domain_handle);
2374                 return status;
2375         } else if (!NT_STATUS_IS_OK(status)) {
2376                 invalidate_cm_connection(conn);
2377                 return status;
2378         }
2379
2380         *cli = conn->samr_pipe;
2381         *sam_handle = conn->sam_domain_handle;
2382         SAFE_FREE(machine_password);
2383         SAFE_FREE(machine_account);
2384         return status;
2385 }
2386
2387 /**********************************************************************
2388  open an schanneld ncacn_ip_tcp connection to LSA
2389 ***********************************************************************/
2390
2391 NTSTATUS cm_connect_lsa_tcp(struct winbindd_domain *domain,
2392                             TALLOC_CTX *mem_ctx,
2393                             struct rpc_pipe_client **cli)
2394 {
2395         struct winbindd_cm_conn *conn;
2396         struct netlogon_creds_CredentialState *creds;
2397         NTSTATUS status;
2398
2399         DEBUG(10,("cm_connect_lsa_tcp\n"));
2400
2401         status = init_dc_connection_rpc(domain);
2402         if (!NT_STATUS_IS_OK(status)) {
2403                 return status;
2404         }
2405
2406         conn = &domain->conn;
2407
2408         if (conn->lsa_pipe_tcp &&
2409             conn->lsa_pipe_tcp->transport->transport == NCACN_IP_TCP &&
2410             conn->lsa_pipe_tcp->auth->auth_level == DCERPC_AUTH_LEVEL_PRIVACY &&
2411             rpccli_is_connected(conn->lsa_pipe_tcp)) {
2412                 goto done;
2413         }
2414
2415         TALLOC_FREE(conn->lsa_pipe_tcp);
2416
2417         status = cm_get_schannel_creds(domain, &creds);
2418         if (!NT_STATUS_IS_OK(status)) {
2419                 goto done;
2420         }
2421
2422         status = cli_rpc_pipe_open_schannel_with_key(conn->cli,
2423                                                      &ndr_table_lsarpc.syntax_id,
2424                                                      NCACN_IP_TCP,
2425                                                      DCERPC_AUTH_LEVEL_PRIVACY,
2426                                                      domain->name,
2427                                                      &creds,
2428                                                      &conn->lsa_pipe_tcp);
2429         if (!NT_STATUS_IS_OK(status)) {
2430                 DEBUG(10,("cli_rpc_pipe_open_schannel_with_key failed: %s\n",
2431                         nt_errstr(status)));
2432                 goto done;
2433         }
2434
2435  done:
2436         if (!NT_STATUS_IS_OK(status)) {
2437                 TALLOC_FREE(conn->lsa_pipe_tcp);
2438                 return status;
2439         }
2440
2441         *cli = conn->lsa_pipe_tcp;
2442
2443         return status;
2444 }
2445
2446 NTSTATUS cm_connect_lsa(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2447                         struct rpc_pipe_client **cli, struct policy_handle *lsa_policy)
2448 {
2449         struct winbindd_cm_conn *conn;
2450         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2451         struct netlogon_creds_CredentialState *p_creds;
2452
2453         result = init_dc_connection_rpc(domain);
2454         if (!NT_STATUS_IS_OK(result))
2455                 return result;
2456
2457         conn = &domain->conn;
2458
2459         if (rpccli_is_connected(conn->lsa_pipe)) {
2460                 goto done;
2461         }
2462
2463         TALLOC_FREE(conn->lsa_pipe);
2464
2465         if ((conn->cli->user_name[0] == '\0') ||
2466             (conn->cli->domain[0] == '\0') ||
2467             (conn->cli->password == NULL || conn->cli->password[0] == '\0')) {
2468                 DEBUG(10, ("cm_connect_lsa: No no user available for "
2469                            "domain %s, trying schannel\n", conn->cli->domain));
2470                 goto schannel;
2471         }
2472
2473         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2474          * authenticated LSA pipe with sign & seal. */
2475         result = cli_rpc_pipe_open_spnego_ntlmssp
2476                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2477                  DCERPC_AUTH_LEVEL_PRIVACY,
2478                  conn->cli->domain, conn->cli->user_name, conn->cli->password,
2479                  &conn->lsa_pipe);
2480
2481         if (!NT_STATUS_IS_OK(result)) {
2482                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2483                           "domain %s using NTLMSSP authenticated pipe: user "
2484                           "%s\\%s. Error was %s. Trying schannel.\n",
2485                           domain->name, conn->cli->domain,
2486                           conn->cli->user_name, nt_errstr(result)));
2487                 goto schannel;
2488         }
2489
2490         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2491                   "NTLMSSP authenticated pipe: user %s\\%s\n",
2492                   domain->name, conn->cli->domain, conn->cli->user_name ));
2493
2494         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2495                                         SEC_FLAG_MAXIMUM_ALLOWED,
2496                                         &conn->lsa_policy);
2497         if (NT_STATUS_IS_OK(result)) {
2498                 goto done;
2499         }
2500
2501         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2502                   "schannel\n"));
2503
2504         TALLOC_FREE(conn->lsa_pipe);
2505
2506  schannel:
2507
2508         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2509
2510         result = cm_get_schannel_creds(domain, &p_creds);
2511         if (!NT_STATUS_IS_OK(result)) {
2512                 /* If this call fails - conn->cli can now be NULL ! */
2513                 DEBUG(10, ("cm_connect_lsa: Could not get schannel auth info "
2514                            "for domain %s (error %s), trying anon\n",
2515                         domain->name,
2516                         nt_errstr(result) ));
2517                 goto anonymous;
2518         }
2519         result = cli_rpc_pipe_open_schannel_with_key
2520                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2521                  DCERPC_AUTH_LEVEL_PRIVACY,
2522                  domain->name, &p_creds, &conn->lsa_pipe);
2523
2524         if (!NT_STATUS_IS_OK(result)) {
2525                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2526                           "domain %s using schannel. Error was %s\n",
2527                           domain->name, nt_errstr(result) ));
2528                 goto anonymous;
2529         }
2530         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2531                   "schannel.\n", domain->name ));
2532
2533         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2534                                         SEC_FLAG_MAXIMUM_ALLOWED,
2535                                         &conn->lsa_policy);
2536         if (NT_STATUS_IS_OK(result)) {
2537                 goto done;
2538         }
2539
2540         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2541                   "anonymous\n"));
2542
2543         TALLOC_FREE(conn->lsa_pipe);
2544
2545  anonymous:
2546
2547         result = cli_rpc_pipe_open_noauth(conn->cli,
2548                                           &ndr_table_lsarpc.syntax_id,
2549                                           &conn->lsa_pipe);
2550         if (!NT_STATUS_IS_OK(result)) {
2551                 result = NT_STATUS_PIPE_NOT_AVAILABLE;
2552                 goto done;
2553         }
2554
2555         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2556                                         SEC_FLAG_MAXIMUM_ALLOWED,
2557                                         &conn->lsa_policy);
2558  done:
2559         if (!NT_STATUS_IS_OK(result)) {
2560                 invalidate_cm_connection(conn);
2561                 return result;
2562         }
2563
2564         *cli = conn->lsa_pipe;
2565         *lsa_policy = conn->lsa_policy;
2566         return result;
2567 }
2568
2569 /****************************************************************************
2570  Open the netlogon pipe to this DC. Use schannel if specified in client conf.
2571  session key stored in conn->netlogon_pipe->dc->sess_key.
2572 ****************************************************************************/
2573
2574 NTSTATUS cm_connect_netlogon(struct winbindd_domain *domain,
2575                              struct rpc_pipe_client **cli)
2576 {
2577         struct winbindd_cm_conn *conn;
2578         NTSTATUS result;
2579
2580         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
2581         uint8  mach_pwd[16];
2582         enum netr_SchannelType sec_chan_type;
2583         const char *account_name;
2584         struct rpc_pipe_client *netlogon_pipe = NULL;
2585
2586         *cli = NULL;
2587
2588         result = init_dc_connection_rpc(domain);
2589         if (!NT_STATUS_IS_OK(result)) {
2590                 return result;
2591         }
2592
2593         conn = &domain->conn;
2594
2595         if (rpccli_is_connected(conn->netlogon_pipe)) {
2596                 *cli = conn->netlogon_pipe;
2597                 return NT_STATUS_OK;
2598         }
2599
2600         TALLOC_FREE(conn->netlogon_pipe);
2601
2602         result = cli_rpc_pipe_open_noauth(conn->cli,
2603                                           &ndr_table_netlogon.syntax_id,
2604                                           &netlogon_pipe);
2605         if (!NT_STATUS_IS_OK(result)) {
2606                 return result;
2607         }
2608
2609         if ((!IS_DC) && (!domain->primary)) {
2610                 /* Clear the schannel request bit and drop down */
2611                 neg_flags &= ~NETLOGON_NEG_SCHANNEL;
2612                 goto no_schannel;
2613         }
2614
2615         if (lp_client_schannel() != False) {
2616                 neg_flags |= NETLOGON_NEG_SCHANNEL;
2617         }
2618
2619         if (!get_trust_pw_hash(domain->name, mach_pwd, &account_name,
2620                                &sec_chan_type))
2621         {
2622                 TALLOC_FREE(netlogon_pipe);
2623                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2624         }
2625
2626         result = rpccli_netlogon_setup_creds(
2627                  netlogon_pipe,
2628                  domain->dcname, /* server name. */
2629                  domain->name,   /* domain name */
2630                  lp_netbios_name(), /* client name */
2631                  account_name,   /* machine account */
2632                  mach_pwd,       /* machine password */
2633                  sec_chan_type,  /* from get_trust_pw */
2634                  &neg_flags);
2635
2636         if (!NT_STATUS_IS_OK(result)) {
2637                 TALLOC_FREE(netlogon_pipe);
2638                 return result;
2639         }
2640
2641         if ((lp_client_schannel() == True) &&
2642                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2643                 DEBUG(3, ("Server did not offer schannel\n"));
2644                 TALLOC_FREE(netlogon_pipe);
2645                 return NT_STATUS_ACCESS_DENIED;
2646         }
2647
2648  no_schannel:
2649         if ((lp_client_schannel() == False) ||
2650                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2651                 /*
2652                  * NetSamLogonEx only works for schannel
2653                  */
2654                 domain->can_do_samlogon_ex = False;
2655
2656                 /* We're done - just keep the existing connection to NETLOGON
2657                  * open */
2658                 conn->netlogon_pipe = netlogon_pipe;
2659                 *cli = conn->netlogon_pipe;
2660                 return NT_STATUS_OK;
2661         }
2662
2663         /* Using the credentials from the first pipe, open a signed and sealed
2664            second netlogon pipe. The session key is stored in the schannel
2665            part of the new pipe auth struct.
2666         */
2667
2668         result = cli_rpc_pipe_open_schannel_with_key(
2669                 conn->cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
2670                 DCERPC_AUTH_LEVEL_PRIVACY, domain->name, &netlogon_pipe->dc,
2671                 &conn->netlogon_pipe);
2672
2673         /* We can now close the initial netlogon pipe. */
2674         TALLOC_FREE(netlogon_pipe);
2675
2676         if (!NT_STATUS_IS_OK(result)) {
2677                 DEBUG(3, ("Could not open schannel'ed NETLOGON pipe. Error "
2678                           "was %s\n", nt_errstr(result)));
2679
2680                 invalidate_cm_connection(conn);
2681                 return result;
2682         }
2683
2684         /*
2685          * Always try netr_LogonSamLogonEx. We will fall back for NT4
2686          * which gives DCERPC_FAULT_OP_RNG_ERROR (function not
2687          * supported). We used to only try SamLogonEx for AD, but
2688          * Samba DCs can also do it. And because we don't distinguish
2689          * between Samba and NT4, always try it once.
2690          */
2691         domain->can_do_samlogon_ex = true;
2692
2693         *cli = conn->netlogon_pipe;
2694         return NT_STATUS_OK;
2695 }
2696
2697 void winbind_msg_ip_dropped(struct messaging_context *msg_ctx,
2698                             void *private_data,
2699                             uint32_t msg_type,
2700                             struct server_id server_id,
2701                             DATA_BLOB *data)
2702 {
2703         struct winbindd_domain *domain;
2704         char *freeit = NULL;
2705         char *addr;
2706
2707         if ((data == NULL)
2708             || (data->data == NULL)
2709             || (data->length == 0)
2710             || (data->data[data->length-1] != '\0')) {
2711                 DEBUG(1, ("invalid msg_ip_dropped message: not a valid "
2712                           "string\n"));
2713                 return;
2714         }
2715
2716         addr = (char *)data->data;
2717         DEBUG(10, ("IP %s dropped\n", addr));
2718
2719         if (!is_ipaddress(addr)) {
2720                 char *slash;
2721                 /*
2722                  * Some code sends us ip addresses with the /netmask
2723                  * suffix
2724                  */
2725                 slash = strchr(addr, '/');
2726                 if (slash == NULL) {
2727                         DEBUG(1, ("invalid msg_ip_dropped message: %s",
2728                                   addr));
2729                         return;
2730                 }
2731                 freeit = talloc_strndup(talloc_tos(), addr, slash-addr);
2732                 if (freeit == NULL) {
2733                         DEBUG(1, ("talloc failed\n"));
2734                         return;
2735                 }
2736                 addr = freeit;
2737                 DEBUG(10, ("Stripped /netmask to IP %s\n", addr));
2738         }
2739
2740         for (domain = domain_list(); domain != NULL; domain = domain->next) {
2741                 char sockaddr[INET6_ADDRSTRLEN];
2742                 if (domain->conn.cli == NULL) {
2743                         continue;
2744                 }
2745                 if (domain->conn.cli->fd == -1) {
2746                         continue;
2747                 }
2748                 client_socket_addr(domain->conn.cli->fd, sockaddr,
2749                                    sizeof(sockaddr));
2750                 if (strequal(sockaddr, addr)) {
2751                         close(domain->conn.cli->fd);
2752                         domain->conn.cli->fd = -1;
2753                 }
2754         }
2755         TALLOC_FREE(freeit);
2756 }