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_state_is_connected(cli)) {
1449                 return;
1450         }
1451
1452         get_peer_addr(cli->fd, addr, sizeof(addr));
1453
1454         key = current_dc_key(talloc_tos(), domain_name);
1455         if (key == NULL) {
1456                 goto done;
1457         }
1458
1459         value = talloc_asprintf(talloc_tos(), "%s %s", addr, dc_name);
1460         if (value == NULL) {
1461                 goto done;
1462         }
1463
1464         gencache_set(key, value, 0x7fffffff);
1465 done:
1466         TALLOC_FREE(value);
1467         TALLOC_FREE(key);
1468 }
1469
1470 bool fetch_current_dc_from_gencache(TALLOC_CTX *mem_ctx,
1471                                     const char *domain_name,
1472                                     char **p_dc_name, char **p_dc_ip)
1473 {
1474         char *key, *value, *p;
1475         bool ret = false;
1476         char *dc_name = NULL;
1477         char *dc_ip = NULL;
1478
1479         key = current_dc_key(talloc_tos(), domain_name);
1480         if (key == NULL) {
1481                 goto done;
1482         }
1483         if (!gencache_get(key, &value, NULL)) {
1484                 goto done;
1485         }
1486         p = strchr(value, ' ');
1487         if (p == NULL) {
1488                 goto done;
1489         }
1490         dc_ip = talloc_strndup(mem_ctx, value, p - value);
1491         if (dc_ip == NULL) {
1492                 goto done;
1493         }
1494         dc_name = talloc_strdup(mem_ctx, p+1);
1495         if (dc_name == NULL) {
1496                 goto done;
1497         }
1498
1499         if (p_dc_ip != NULL) {
1500                 *p_dc_ip = dc_ip;
1501                 dc_ip = NULL;
1502         }
1503         if (p_dc_name != NULL) {
1504                 *p_dc_name = dc_name;
1505                 dc_name = NULL;
1506         }
1507         ret = true;
1508 done:
1509         TALLOC_FREE(dc_name);
1510         TALLOC_FREE(dc_ip);
1511         TALLOC_FREE(key);
1512         return ret;
1513 }
1514
1515 static NTSTATUS cm_open_connection(struct winbindd_domain *domain,
1516                                    struct winbindd_cm_conn *new_conn)
1517 {
1518         TALLOC_CTX *mem_ctx;
1519         NTSTATUS result;
1520         char *saf_servername = saf_fetch( domain->name );
1521         int retries;
1522
1523         if ((mem_ctx = talloc_init("cm_open_connection")) == NULL) {
1524                 SAFE_FREE(saf_servername);
1525                 set_domain_offline(domain);
1526                 return NT_STATUS_NO_MEMORY;
1527         }
1528
1529         /* we have to check the server affinity cache here since
1530            later we select a DC based on response time and not preference */
1531
1532         /* Check the negative connection cache
1533            before talking to it. It going down may have
1534            triggered the reconnection. */
1535
1536         if ( saf_servername && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, saf_servername))) {
1537
1538                 DEBUG(10,("cm_open_connection: saf_servername is '%s' for domain %s\n",
1539                         saf_servername, domain->name ));
1540
1541                 /* convert an ip address to a name */
1542                 if (is_ipaddress( saf_servername ) ) {
1543                         fstring saf_name;
1544                         struct sockaddr_storage ss;
1545
1546                         if (!interpret_string_addr(&ss, saf_servername,
1547                                                 AI_NUMERICHOST)) {
1548                                 return NT_STATUS_UNSUCCESSFUL;
1549                         }
1550                         if (dcip_to_name(mem_ctx, domain, &ss, saf_name )) {
1551                                 strlcpy(domain->dcname, saf_name, sizeof(domain->dcname));
1552                         } else {
1553                                 winbind_add_failed_connection_entry(
1554                                         domain, saf_servername,
1555                                         NT_STATUS_UNSUCCESSFUL);
1556                         }
1557                 } else {
1558                         fstrcpy( domain->dcname, saf_servername );
1559                 }
1560
1561                 SAFE_FREE( saf_servername );
1562         }
1563
1564         for (retries = 0; retries < 3; retries++) {
1565                 int fd = -1;
1566                 bool retry = False;
1567
1568                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1569
1570                 DEBUG(10,("cm_open_connection: dcname is '%s' for domain %s\n",
1571                         domain->dcname, domain->name ));
1572
1573                 if (*domain->dcname
1574                         && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, domain->dcname))
1575                         && (resolve_name(domain->dcname, &domain->dcaddr, 0x20, true)))
1576                 {
1577                         NTSTATUS status;
1578
1579                         status = smbsock_connect(&domain->dcaddr, 0,
1580                                                  NULL, -1, NULL, -1,
1581                                                  &fd, NULL, 10);
1582                         if (!NT_STATUS_IS_OK(status)) {
1583                                 fd = -1;
1584                         }
1585                 }
1586
1587                 if ((fd == -1)
1588                         && !find_new_dc(mem_ctx, domain, domain->dcname, &domain->dcaddr, &fd))
1589                 {
1590                         /* This is the one place where we will
1591                            set the global winbindd offline state
1592                            to true, if a "WINBINDD_OFFLINE" entry
1593                            is found in the winbindd cache. */
1594                         set_global_winbindd_state_offline();
1595                         break;
1596                 }
1597
1598                 new_conn->cli = NULL;
1599
1600                 result = cm_prepare_connection(domain, fd, domain->dcname,
1601                         &new_conn->cli, &retry);
1602
1603                 if (!retry)
1604                         break;
1605         }
1606
1607         if (NT_STATUS_IS_OK(result)) {
1608
1609                 winbindd_set_locator_kdc_envs(domain);
1610
1611                 if (domain->online == False) {
1612                         /* We're changing state from offline to online. */
1613                         set_global_winbindd_state_online();
1614                 }
1615                 set_domain_online(domain);
1616
1617                 /*
1618                  * Much as I hate global state, this seems to be the point
1619                  * where we can be certain that we have a proper connection to
1620                  * a DC. wbinfo --dc-info needs that information, store it in
1621                  * gencache with a looong timeout. This will need revisiting
1622                  * once we start to connect to multiple DCs, wbcDcInfo is
1623                  * already prepared for that.
1624                  */
1625                 store_current_dc_in_gencache(domain->name, domain->dcname,
1626                                              new_conn->cli);
1627         } else {
1628                 /* Ensure we setup the retry handler. */
1629                 set_domain_offline(domain);
1630         }
1631
1632         talloc_destroy(mem_ctx);
1633         return result;
1634 }
1635
1636 /* Close down all open pipes on a connection. */
1637
1638 void invalidate_cm_connection(struct winbindd_cm_conn *conn)
1639 {
1640         NTSTATUS result;
1641
1642         /* We're closing down a possibly dead
1643            connection. Don't have impossibly long (10s) timeouts. */
1644
1645         if (conn->cli) {
1646                 cli_set_timeout(conn->cli, 1000); /* 1 second. */
1647         }
1648
1649         if (conn->samr_pipe != NULL) {
1650                 if (is_valid_policy_hnd(&conn->sam_connect_handle)) {
1651                         dcerpc_samr_Close(conn->samr_pipe->binding_handle,
1652                                           talloc_tos(),
1653                                           &conn->sam_connect_handle,
1654                                           &result);
1655                 }
1656                 TALLOC_FREE(conn->samr_pipe);
1657                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1658                 if (conn->cli) {
1659                         cli_set_timeout(conn->cli, 500);
1660                 }
1661         }
1662
1663         if (conn->lsa_pipe != NULL) {
1664                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1665                         dcerpc_lsa_Close(conn->lsa_pipe->binding_handle,
1666                                          talloc_tos(),
1667                                          &conn->lsa_policy,
1668                                          &result);
1669                 }
1670                 TALLOC_FREE(conn->lsa_pipe);
1671                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1672                 if (conn->cli) {
1673                         cli_set_timeout(conn->cli, 500);
1674                 }
1675         }
1676
1677         if (conn->lsa_pipe_tcp != NULL) {
1678                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1679                         dcerpc_lsa_Close(conn->lsa_pipe_tcp->binding_handle,
1680                                          talloc_tos(),
1681                                          &conn->lsa_policy,
1682                                          &result);
1683                 }
1684                 TALLOC_FREE(conn->lsa_pipe_tcp);
1685                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1686                 if (conn->cli) {
1687                         cli_set_timeout(conn->cli, 500);
1688                 }
1689         }
1690
1691         if (conn->netlogon_pipe != NULL) {
1692                 TALLOC_FREE(conn->netlogon_pipe);
1693                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1694                 if (conn->cli) {
1695                         cli_set_timeout(conn->cli, 500);
1696                 }
1697         }
1698
1699         if (conn->cli) {
1700                 cli_shutdown(conn->cli);
1701         }
1702
1703         conn->cli = NULL;
1704 }
1705
1706 void close_conns_after_fork(void)
1707 {
1708         struct winbindd_domain *domain;
1709         struct winbindd_cli_state *cli_state;
1710
1711         for (domain = domain_list(); domain; domain = domain->next) {
1712                 struct cli_state *cli = domain->conn.cli;
1713
1714                 /*
1715                  * first close the low level SMB TCP connection
1716                  * so that we don't generate any SMBclose
1717                  * requests in invalidate_cm_connection()
1718                  */
1719                 if (cli_state_is_connected(domain->conn.cli)) {
1720                         close(domain->conn.cli->fd);
1721                         domain->conn.cli->fd = -1;
1722                 }
1723
1724                 invalidate_cm_connection(&domain->conn);
1725         }
1726
1727         for (cli_state = winbindd_client_list();
1728              cli_state != NULL;
1729              cli_state = cli_state->next) {
1730                 if (cli_state->sock >= 0) {
1731                         close(cli_state->sock);
1732                         cli_state->sock = -1;
1733                 }
1734         }
1735 }
1736
1737 static bool connection_ok(struct winbindd_domain *domain)
1738 {
1739         bool ok;
1740
1741         ok = cli_state_is_connected(domain->conn.cli);
1742         if (!ok) {
1743                 DEBUG(3, ("connection_ok: Connection to %s for domain %s is not connected\n",
1744                           domain->dcname, domain->name));
1745                 return False;
1746         }
1747
1748         if (domain->online == False) {
1749                 DEBUG(3, ("connection_ok: Domain %s is offline\n", domain->name));
1750                 return False;
1751         }
1752
1753         return True;
1754 }
1755
1756 /* Initialize a new connection up to the RPC BIND.
1757    Bypass online status check so always does network calls. */
1758
1759 static NTSTATUS init_dc_connection_network(struct winbindd_domain *domain)
1760 {
1761         NTSTATUS result;
1762
1763         /* Internal connections never use the network. */
1764         if (domain->internal) {
1765                 domain->initialized = True;
1766                 return NT_STATUS_OK;
1767         }
1768
1769         if (!winbindd_can_contact_domain(domain)) {
1770                 invalidate_cm_connection(&domain->conn);
1771                 domain->initialized = True;
1772                 return NT_STATUS_OK;
1773         }
1774
1775         if (connection_ok(domain)) {
1776                 if (!domain->initialized) {
1777                         set_dc_type_and_flags(domain);
1778                 }
1779                 return NT_STATUS_OK;
1780         }
1781
1782         invalidate_cm_connection(&domain->conn);
1783
1784         result = cm_open_connection(domain, &domain->conn);
1785
1786         if (NT_STATUS_IS_OK(result) && !domain->initialized) {
1787                 set_dc_type_and_flags(domain);
1788         }
1789
1790         return result;
1791 }
1792
1793 NTSTATUS init_dc_connection(struct winbindd_domain *domain)
1794 {
1795         if (domain->internal) {
1796                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1797         }
1798
1799         if (domain->initialized && !domain->online) {
1800                 /* We check for online status elsewhere. */
1801                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1802         }
1803
1804         return init_dc_connection_network(domain);
1805 }
1806
1807 static NTSTATUS init_dc_connection_rpc(struct winbindd_domain *domain)
1808 {
1809         NTSTATUS status;
1810
1811         status = init_dc_connection(domain);
1812         if (!NT_STATUS_IS_OK(status)) {
1813                 return status;
1814         }
1815
1816         if (!domain->internal && domain->conn.cli == NULL) {
1817                 /* happens for trusted domains without inbound trust */
1818                 return NT_STATUS_TRUSTED_DOMAIN_FAILURE;
1819         }
1820
1821         return NT_STATUS_OK;
1822 }
1823
1824 /******************************************************************************
1825  Set the trust flags (direction and forest location) for a domain
1826 ******************************************************************************/
1827
1828 static bool set_dc_type_and_flags_trustinfo( struct winbindd_domain *domain )
1829 {
1830         struct winbindd_domain *our_domain;
1831         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
1832         WERROR werr;
1833         struct netr_DomainTrustList trusts;
1834         int i;
1835         uint32 flags = (NETR_TRUST_FLAG_IN_FOREST |
1836                         NETR_TRUST_FLAG_OUTBOUND |
1837                         NETR_TRUST_FLAG_INBOUND);
1838         struct rpc_pipe_client *cli;
1839         TALLOC_CTX *mem_ctx = NULL;
1840         struct dcerpc_binding_handle *b;
1841
1842         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s\n", domain->name ));
1843
1844         /* Our primary domain doesn't need to worry about trust flags.
1845            Force it to go through the network setup */
1846         if ( domain->primary ) {
1847                 return False;
1848         }
1849
1850         our_domain = find_our_domain();
1851
1852         if ( !connection_ok(our_domain) ) {
1853                 DEBUG(3,("set_dc_type_and_flags_trustinfo: No connection to our domain!\n"));
1854                 return False;
1855         }
1856
1857         /* This won't work unless our domain is AD */
1858
1859         if ( !our_domain->active_directory ) {
1860                 return False;
1861         }
1862
1863         /* Use DsEnumerateDomainTrusts to get us the trust direction
1864            and type */
1865
1866         result = cm_connect_netlogon(our_domain, &cli);
1867
1868         if (!NT_STATUS_IS_OK(result)) {
1869                 DEBUG(5, ("set_dc_type_and_flags_trustinfo: Could not open "
1870                           "a connection to %s for PIPE_NETLOGON (%s)\n",
1871                           domain->name, nt_errstr(result)));
1872                 return False;
1873         }
1874
1875         b = cli->binding_handle;
1876
1877         if ( (mem_ctx = talloc_init("set_dc_type_and_flags_trustinfo")) == NULL ) {
1878                 DEBUG(0,("set_dc_type_and_flags_trustinfo: talloc_init() failed!\n"));
1879                 return False;
1880         }
1881
1882         result = dcerpc_netr_DsrEnumerateDomainTrusts(b, mem_ctx,
1883                                                       cli->desthost,
1884                                                       flags,
1885                                                       &trusts,
1886                                                       &werr);
1887         if (!NT_STATUS_IS_OK(result)) {
1888                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1889                         "failed to query trusted domain list: %s\n",
1890                         nt_errstr(result)));
1891                 talloc_destroy(mem_ctx);
1892                 return false;
1893         }
1894         if (!W_ERROR_IS_OK(werr)) {
1895                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1896                         "failed to query trusted domain list: %s\n",
1897                         win_errstr(werr)));
1898                 talloc_destroy(mem_ctx);
1899                 return false;
1900         }
1901
1902         /* Now find the domain name and get the flags */
1903
1904         for ( i=0; i<trusts.count; i++ ) {
1905                 if ( strequal( domain->name, trusts.array[i].netbios_name) ) {
1906                         domain->domain_flags          = trusts.array[i].trust_flags;
1907                         domain->domain_type           = trusts.array[i].trust_type;
1908                         domain->domain_trust_attribs  = trusts.array[i].trust_attributes;
1909
1910                         if ( domain->domain_type == NETR_TRUST_TYPE_UPLEVEL )
1911                                 domain->active_directory = True;
1912
1913                         /* This flag is only set if the domain is *our*
1914                            primary domain and the primary domain is in
1915                            native mode */
1916
1917                         domain->native_mode = (domain->domain_flags & NETR_TRUST_FLAG_NATIVE);
1918
1919                         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s is %sin "
1920                                   "native mode.\n", domain->name,
1921                                   domain->native_mode ? "" : "NOT "));
1922
1923                         DEBUG(5,("set_dc_type_and_flags_trustinfo: domain %s is %s"
1924                                  "running active directory.\n", domain->name,
1925                                  domain->active_directory ? "" : "NOT "));
1926
1927
1928                         domain->initialized = True;
1929
1930                         break;
1931                 }
1932         }
1933
1934         talloc_destroy( mem_ctx );
1935
1936         return domain->initialized;
1937 }
1938
1939 /******************************************************************************
1940  We can 'sense' certain things about the DC by it's replies to certain
1941  questions.
1942
1943  This tells us if this particular remote server is Active Directory, and if it
1944  is native mode.
1945 ******************************************************************************/
1946
1947 static void set_dc_type_and_flags_connect( struct winbindd_domain *domain )
1948 {
1949         NTSTATUS status, result;
1950         WERROR werr;
1951         TALLOC_CTX              *mem_ctx = NULL;
1952         struct rpc_pipe_client  *cli = NULL;
1953         struct policy_handle pol;
1954         union dssetup_DsRoleInfo info;
1955         union lsa_PolicyInformation *lsa_info = NULL;
1956
1957         if (!connection_ok(domain)) {
1958                 return;
1959         }
1960
1961         mem_ctx = talloc_init("set_dc_type_and_flags on domain %s\n",
1962                               domain->name);
1963         if (!mem_ctx) {
1964                 DEBUG(1, ("set_dc_type_and_flags_connect: talloc_init() failed\n"));
1965                 return;
1966         }
1967
1968         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s\n", domain->name ));
1969
1970         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
1971                                           &ndr_table_dssetup.syntax_id,
1972                                           &cli);
1973
1974         if (!NT_STATUS_IS_OK(status)) {
1975                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
1976                           "PI_DSSETUP on domain %s: (%s)\n",
1977                           domain->name, nt_errstr(status)));
1978
1979                 /* if this is just a non-AD domain we need to continue
1980                  * identifying so that we can in the end return with
1981                  * domain->initialized = True - gd */
1982
1983                 goto no_dssetup;
1984         }
1985
1986         status = dcerpc_dssetup_DsRoleGetPrimaryDomainInformation(cli->binding_handle, mem_ctx,
1987                                                                   DS_ROLE_BASIC_INFORMATION,
1988                                                                   &info,
1989                                                                   &werr);
1990         TALLOC_FREE(cli);
1991
1992         if (NT_STATUS_IS_OK(status)) {
1993                 result = werror_to_ntstatus(werr);
1994         }
1995         if (!NT_STATUS_IS_OK(status)) {
1996                 DEBUG(5, ("set_dc_type_and_flags_connect: rpccli_ds_getprimarydominfo "
1997                           "on domain %s failed: (%s)\n",
1998                           domain->name, nt_errstr(status)));
1999
2000                 /* older samba3 DCs will return DCERPC_FAULT_OP_RNG_ERROR for
2001                  * every opcode on the DSSETUP pipe, continue with
2002                  * no_dssetup mode here as well to get domain->initialized
2003                  * set - gd */
2004
2005                 if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE)) {
2006                         goto no_dssetup;
2007                 }
2008
2009                 TALLOC_FREE(mem_ctx);
2010                 return;
2011         }
2012
2013         if ((info.basic.flags & DS_ROLE_PRIMARY_DS_RUNNING) &&
2014             !(info.basic.flags & DS_ROLE_PRIMARY_DS_MIXED_MODE)) {
2015                 domain->native_mode = True;
2016         } else {
2017                 domain->native_mode = False;
2018         }
2019
2020 no_dssetup:
2021         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
2022                                           &ndr_table_lsarpc.syntax_id, &cli);
2023
2024         if (!NT_STATUS_IS_OK(status)) {
2025                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
2026                           "PI_LSARPC on domain %s: (%s)\n",
2027                           domain->name, nt_errstr(status)));
2028                 TALLOC_FREE(cli);
2029                 TALLOC_FREE(mem_ctx);
2030                 return;
2031         }
2032
2033         status = rpccli_lsa_open_policy2(cli, mem_ctx, True,
2034                                          SEC_FLAG_MAXIMUM_ALLOWED, &pol);
2035
2036         if (NT_STATUS_IS_OK(status)) {
2037                 /* This particular query is exactly what Win2k clients use
2038                    to determine that the DC is active directory */
2039                 status = dcerpc_lsa_QueryInfoPolicy2(cli->binding_handle, mem_ctx,
2040                                                      &pol,
2041                                                      LSA_POLICY_INFO_DNS,
2042                                                      &lsa_info,
2043                                                      &result);
2044         }
2045
2046         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2047                 domain->active_directory = True;
2048
2049                 if (lsa_info->dns.name.string) {
2050                         fstrcpy(domain->name, lsa_info->dns.name.string);
2051                 }
2052
2053                 if (lsa_info->dns.dns_domain.string) {
2054                         fstrcpy(domain->alt_name,
2055                                 lsa_info->dns.dns_domain.string);
2056                 }
2057
2058                 /* See if we can set some domain trust flags about
2059                    ourself */
2060
2061                 if (lsa_info->dns.dns_forest.string) {
2062                         fstrcpy(domain->forest_name,
2063                                 lsa_info->dns.dns_forest.string);
2064
2065                         if (strequal(domain->forest_name, domain->alt_name)) {
2066                                 domain->domain_flags |= NETR_TRUST_FLAG_TREEROOT;
2067                         }
2068                 }
2069
2070                 if (lsa_info->dns.sid) {
2071                         sid_copy(&domain->sid, lsa_info->dns.sid);
2072                 }
2073         } else {
2074                 domain->active_directory = False;
2075
2076                 status = rpccli_lsa_open_policy(cli, mem_ctx, True,
2077                                                 SEC_FLAG_MAXIMUM_ALLOWED,
2078                                                 &pol);
2079
2080                 if (!NT_STATUS_IS_OK(status)) {
2081                         goto done;
2082                 }
2083
2084                 status = dcerpc_lsa_QueryInfoPolicy(cli->binding_handle, mem_ctx,
2085                                                     &pol,
2086                                                     LSA_POLICY_INFO_ACCOUNT_DOMAIN,
2087                                                     &lsa_info,
2088                                                     &result);
2089                 if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2090
2091                         if (lsa_info->account_domain.name.string) {
2092                                 fstrcpy(domain->name,
2093                                         lsa_info->account_domain.name.string);
2094                         }
2095
2096                         if (lsa_info->account_domain.sid) {
2097                                 sid_copy(&domain->sid, lsa_info->account_domain.sid);
2098                         }
2099                 }
2100         }
2101 done:
2102
2103         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s is %sin native mode.\n",
2104                   domain->name, domain->native_mode ? "" : "NOT "));
2105
2106         DEBUG(5,("set_dc_type_and_flags_connect: domain %s is %srunning active directory.\n",
2107                   domain->name, domain->active_directory ? "" : "NOT "));
2108
2109         domain->can_do_ncacn_ip_tcp = domain->active_directory;
2110         domain->can_do_validation6 = domain->active_directory;
2111
2112         TALLOC_FREE(cli);
2113
2114         TALLOC_FREE(mem_ctx);
2115
2116         domain->initialized = True;
2117 }
2118
2119 /**********************************************************************
2120  Set the domain_flags (trust attributes, domain operating modes, etc...
2121 ***********************************************************************/
2122
2123 static void set_dc_type_and_flags( struct winbindd_domain *domain )
2124 {
2125         /* we always have to contact our primary domain */
2126
2127         if ( domain->primary ) {
2128                 DEBUG(10,("set_dc_type_and_flags: setting up flags for "
2129                           "primary domain\n"));
2130                 set_dc_type_and_flags_connect( domain );
2131                 return;
2132         }
2133
2134         /* Use our DC to get the information if possible */
2135
2136         if ( !set_dc_type_and_flags_trustinfo( domain ) ) {
2137                 /* Otherwise, fallback to contacting the
2138                    domain directly */
2139                 set_dc_type_and_flags_connect( domain );
2140         }
2141
2142         return;
2143 }
2144
2145
2146
2147 /**********************************************************************
2148 ***********************************************************************/
2149
2150 static NTSTATUS cm_get_schannel_creds(struct winbindd_domain *domain,
2151                                    struct netlogon_creds_CredentialState **ppdc)
2152 {
2153         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2154         struct rpc_pipe_client *netlogon_pipe;
2155
2156         if (lp_client_schannel() == False) {
2157                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2158         }
2159
2160         result = cm_connect_netlogon(domain, &netlogon_pipe);
2161         if (!NT_STATUS_IS_OK(result)) {
2162                 return result;
2163         }
2164
2165         /* Return a pointer to the struct netlogon_creds_CredentialState from the
2166            netlogon pipe. */
2167
2168         if (!domain->conn.netlogon_pipe->dc) {
2169                 return NT_STATUS_INTERNAL_ERROR; /* This shouldn't happen. */
2170         }
2171
2172         *ppdc = domain->conn.netlogon_pipe->dc;
2173         return NT_STATUS_OK;
2174 }
2175
2176 NTSTATUS cm_connect_sam(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2177                         struct rpc_pipe_client **cli, struct policy_handle *sam_handle)
2178 {
2179         struct winbindd_cm_conn *conn;
2180         NTSTATUS status, result;
2181         struct netlogon_creds_CredentialState *p_creds;
2182         char *machine_password = NULL;
2183         char *machine_account = NULL;
2184         char *domain_name = NULL;
2185
2186         if (sid_check_is_domain(&domain->sid)) {
2187                 return open_internal_samr_conn(mem_ctx, domain, cli, sam_handle);
2188         }
2189
2190         status = init_dc_connection_rpc(domain);
2191         if (!NT_STATUS_IS_OK(status)) {
2192                 return status;
2193         }
2194
2195         conn = &domain->conn;
2196
2197         if (rpccli_is_connected(conn->samr_pipe)) {
2198                 goto done;
2199         }
2200
2201         TALLOC_FREE(conn->samr_pipe);
2202
2203         /*
2204          * No SAMR pipe yet. Attempt to get an NTLMSSP SPNEGO authenticated
2205          * sign and sealed pipe using the machine account password by
2206          * preference. If we can't - try schannel, if that fails, try
2207          * anonymous.
2208          */
2209
2210         if ((conn->cli->user_name[0] == '\0') ||
2211             (conn->cli->domain[0] == '\0') ||
2212             (conn->cli->password == NULL || conn->cli->password[0] == '\0'))
2213         {
2214                 status = get_trust_creds(domain, &machine_password,
2215                                          &machine_account, NULL);
2216                 if (!NT_STATUS_IS_OK(status)) {
2217                         DEBUG(10, ("cm_connect_sam: No no user available for "
2218                                    "domain %s, trying schannel\n", conn->cli->domain));
2219                         goto schannel;
2220                 }
2221                 domain_name = domain->name;
2222         } else {
2223                 machine_password = SMB_STRDUP(conn->cli->password);
2224                 machine_account = SMB_STRDUP(conn->cli->user_name);
2225                 domain_name = conn->cli->domain;
2226         }
2227
2228         if (!machine_password || !machine_account) {
2229                 status = NT_STATUS_NO_MEMORY;
2230                 goto done;
2231         }
2232
2233         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2234            authenticated SAMR pipe with sign & seal. */
2235         status = cli_rpc_pipe_open_spnego_ntlmssp(conn->cli,
2236                                                   &ndr_table_samr.syntax_id,
2237                                                   NCACN_NP,
2238                                                   DCERPC_AUTH_LEVEL_PRIVACY,
2239                                                   domain_name,
2240                                                   machine_account,
2241                                                   machine_password,
2242                                                   &conn->samr_pipe);
2243
2244         if (!NT_STATUS_IS_OK(status)) {
2245                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR "
2246                           "pipe for domain %s using NTLMSSP "
2247                           "authenticated pipe: user %s\\%s. Error was "
2248                           "%s\n", domain->name, domain_name,
2249                           machine_account, nt_errstr(status)));
2250                 goto schannel;
2251         }
2252
2253         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for "
2254                   "domain %s using NTLMSSP authenticated "
2255                   "pipe: user %s\\%s\n", domain->name,
2256                   domain_name, machine_account));
2257
2258         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2259                                       conn->samr_pipe->desthost,
2260                                       SEC_FLAG_MAXIMUM_ALLOWED,
2261                                       &conn->sam_connect_handle,
2262                                       &result);
2263         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2264                 goto open_domain;
2265         }
2266         if (NT_STATUS_IS_OK(status)) {
2267                 status = result;
2268         }
2269
2270         DEBUG(10,("cm_connect_sam: ntlmssp-sealed dcerpc_samr_Connect2 "
2271                   "failed for domain %s, error was %s. Trying schannel\n",
2272                   domain->name, nt_errstr(status) ));
2273         TALLOC_FREE(conn->samr_pipe);
2274
2275  schannel:
2276
2277         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2278
2279         status = cm_get_schannel_creds(domain, &p_creds);
2280         if (!NT_STATUS_IS_OK(status)) {
2281                 /* If this call fails - conn->cli can now be NULL ! */
2282                 DEBUG(10, ("cm_connect_sam: Could not get schannel auth info "
2283                            "for domain %s (error %s), trying anon\n",
2284                         domain->name,
2285                         nt_errstr(status) ));
2286                 goto anonymous;
2287         }
2288         status = cli_rpc_pipe_open_schannel_with_key
2289                 (conn->cli, &ndr_table_samr.syntax_id, NCACN_NP,
2290                  DCERPC_AUTH_LEVEL_PRIVACY,
2291                  domain->name, &p_creds, &conn->samr_pipe);
2292
2293         if (!NT_STATUS_IS_OK(status)) {
2294                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR pipe for "
2295                           "domain %s using schannel. Error was %s\n",
2296                           domain->name, nt_errstr(status) ));
2297                 goto anonymous;
2298         }
2299         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for domain %s using "
2300                   "schannel.\n", domain->name ));
2301
2302         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2303                                       conn->samr_pipe->desthost,
2304                                       SEC_FLAG_MAXIMUM_ALLOWED,
2305                                       &conn->sam_connect_handle,
2306                                       &result);
2307         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2308                 goto open_domain;
2309         }
2310         if (NT_STATUS_IS_OK(status)) {
2311                 status = result;
2312         }
2313         DEBUG(10,("cm_connect_sam: schannel-sealed dcerpc_samr_Connect2 failed "
2314                   "for domain %s, error was %s. Trying anonymous\n",
2315                   domain->name, nt_errstr(status) ));
2316         TALLOC_FREE(conn->samr_pipe);
2317
2318  anonymous:
2319
2320         /* Finally fall back to anonymous. */
2321         status = cli_rpc_pipe_open_noauth(conn->cli, &ndr_table_samr.syntax_id,
2322                                           &conn->samr_pipe);
2323
2324         if (!NT_STATUS_IS_OK(status)) {
2325                 goto done;
2326         }
2327
2328         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2329                                       conn->samr_pipe->desthost,
2330                                       SEC_FLAG_MAXIMUM_ALLOWED,
2331                                       &conn->sam_connect_handle,
2332                                       &result);
2333         if (!NT_STATUS_IS_OK(status)) {
2334                 DEBUG(10,("cm_connect_sam: rpccli_samr_Connect2 failed "
2335                           "for domain %s Error was %s\n",
2336                           domain->name, nt_errstr(status) ));
2337                 goto done;
2338         }
2339         if (!NT_STATUS_IS_OK(result)) {
2340                 status = result;
2341                 DEBUG(10,("cm_connect_sam: dcerpc_samr_Connect2 failed "
2342                           "for domain %s Error was %s\n",
2343                           domain->name, nt_errstr(result)));
2344                 goto done;
2345         }
2346
2347  open_domain:
2348         status = dcerpc_samr_OpenDomain(conn->samr_pipe->binding_handle,
2349                                         mem_ctx,
2350                                         &conn->sam_connect_handle,
2351                                         SEC_FLAG_MAXIMUM_ALLOWED,
2352                                         &domain->sid,
2353                                         &conn->sam_domain_handle,
2354                                         &result);
2355         if (!NT_STATUS_IS_OK(status)) {
2356                 goto done;
2357         }
2358
2359         status = result;
2360  done:
2361
2362         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
2363                 /*
2364                  * if we got access denied, we might just have no access rights
2365                  * to talk to the remote samr server server (e.g. when we are a
2366                  * PDC and we are connecting a w2k8 pdc via an interdomain
2367                  * trust). In that case do not invalidate the whole connection
2368                  * stack
2369                  */
2370                 TALLOC_FREE(conn->samr_pipe);
2371                 ZERO_STRUCT(conn->sam_domain_handle);
2372                 return status;
2373         } else if (!NT_STATUS_IS_OK(status)) {
2374                 invalidate_cm_connection(conn);
2375                 return status;
2376         }
2377
2378         *cli = conn->samr_pipe;
2379         *sam_handle = conn->sam_domain_handle;
2380         SAFE_FREE(machine_password);
2381         SAFE_FREE(machine_account);
2382         return status;
2383 }
2384
2385 /**********************************************************************
2386  open an schanneld ncacn_ip_tcp connection to LSA
2387 ***********************************************************************/
2388
2389 NTSTATUS cm_connect_lsa_tcp(struct winbindd_domain *domain,
2390                             TALLOC_CTX *mem_ctx,
2391                             struct rpc_pipe_client **cli)
2392 {
2393         struct winbindd_cm_conn *conn;
2394         struct netlogon_creds_CredentialState *creds;
2395         NTSTATUS status;
2396
2397         DEBUG(10,("cm_connect_lsa_tcp\n"));
2398
2399         status = init_dc_connection_rpc(domain);
2400         if (!NT_STATUS_IS_OK(status)) {
2401                 return status;
2402         }
2403
2404         conn = &domain->conn;
2405
2406         if (conn->lsa_pipe_tcp &&
2407             conn->lsa_pipe_tcp->transport->transport == NCACN_IP_TCP &&
2408             conn->lsa_pipe_tcp->auth->auth_level == DCERPC_AUTH_LEVEL_PRIVACY &&
2409             rpccli_is_connected(conn->lsa_pipe_tcp)) {
2410                 goto done;
2411         }
2412
2413         TALLOC_FREE(conn->lsa_pipe_tcp);
2414
2415         status = cm_get_schannel_creds(domain, &creds);
2416         if (!NT_STATUS_IS_OK(status)) {
2417                 goto done;
2418         }
2419
2420         status = cli_rpc_pipe_open_schannel_with_key(conn->cli,
2421                                                      &ndr_table_lsarpc.syntax_id,
2422                                                      NCACN_IP_TCP,
2423                                                      DCERPC_AUTH_LEVEL_PRIVACY,
2424                                                      domain->name,
2425                                                      &creds,
2426                                                      &conn->lsa_pipe_tcp);
2427         if (!NT_STATUS_IS_OK(status)) {
2428                 DEBUG(10,("cli_rpc_pipe_open_schannel_with_key failed: %s\n",
2429                         nt_errstr(status)));
2430                 goto done;
2431         }
2432
2433  done:
2434         if (!NT_STATUS_IS_OK(status)) {
2435                 TALLOC_FREE(conn->lsa_pipe_tcp);
2436                 return status;
2437         }
2438
2439         *cli = conn->lsa_pipe_tcp;
2440
2441         return status;
2442 }
2443
2444 NTSTATUS cm_connect_lsa(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2445                         struct rpc_pipe_client **cli, struct policy_handle *lsa_policy)
2446 {
2447         struct winbindd_cm_conn *conn;
2448         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2449         struct netlogon_creds_CredentialState *p_creds;
2450
2451         result = init_dc_connection_rpc(domain);
2452         if (!NT_STATUS_IS_OK(result))
2453                 return result;
2454
2455         conn = &domain->conn;
2456
2457         if (rpccli_is_connected(conn->lsa_pipe)) {
2458                 goto done;
2459         }
2460
2461         TALLOC_FREE(conn->lsa_pipe);
2462
2463         if ((conn->cli->user_name[0] == '\0') ||
2464             (conn->cli->domain[0] == '\0') ||
2465             (conn->cli->password == NULL || conn->cli->password[0] == '\0')) {
2466                 DEBUG(10, ("cm_connect_lsa: No no user available for "
2467                            "domain %s, trying schannel\n", conn->cli->domain));
2468                 goto schannel;
2469         }
2470
2471         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2472          * authenticated LSA pipe with sign & seal. */
2473         result = cli_rpc_pipe_open_spnego_ntlmssp
2474                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2475                  DCERPC_AUTH_LEVEL_PRIVACY,
2476                  conn->cli->domain, conn->cli->user_name, conn->cli->password,
2477                  &conn->lsa_pipe);
2478
2479         if (!NT_STATUS_IS_OK(result)) {
2480                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2481                           "domain %s using NTLMSSP authenticated pipe: user "
2482                           "%s\\%s. Error was %s. Trying schannel.\n",
2483                           domain->name, conn->cli->domain,
2484                           conn->cli->user_name, nt_errstr(result)));
2485                 goto schannel;
2486         }
2487
2488         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2489                   "NTLMSSP authenticated pipe: user %s\\%s\n",
2490                   domain->name, conn->cli->domain, conn->cli->user_name ));
2491
2492         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2493                                         SEC_FLAG_MAXIMUM_ALLOWED,
2494                                         &conn->lsa_policy);
2495         if (NT_STATUS_IS_OK(result)) {
2496                 goto done;
2497         }
2498
2499         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2500                   "schannel\n"));
2501
2502         TALLOC_FREE(conn->lsa_pipe);
2503
2504  schannel:
2505
2506         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2507
2508         result = cm_get_schannel_creds(domain, &p_creds);
2509         if (!NT_STATUS_IS_OK(result)) {
2510                 /* If this call fails - conn->cli can now be NULL ! */
2511                 DEBUG(10, ("cm_connect_lsa: Could not get schannel auth info "
2512                            "for domain %s (error %s), trying anon\n",
2513                         domain->name,
2514                         nt_errstr(result) ));
2515                 goto anonymous;
2516         }
2517         result = cli_rpc_pipe_open_schannel_with_key
2518                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2519                  DCERPC_AUTH_LEVEL_PRIVACY,
2520                  domain->name, &p_creds, &conn->lsa_pipe);
2521
2522         if (!NT_STATUS_IS_OK(result)) {
2523                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2524                           "domain %s using schannel. Error was %s\n",
2525                           domain->name, nt_errstr(result) ));
2526                 goto anonymous;
2527         }
2528         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2529                   "schannel.\n", domain->name ));
2530
2531         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2532                                         SEC_FLAG_MAXIMUM_ALLOWED,
2533                                         &conn->lsa_policy);
2534         if (NT_STATUS_IS_OK(result)) {
2535                 goto done;
2536         }
2537
2538         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2539                   "anonymous\n"));
2540
2541         TALLOC_FREE(conn->lsa_pipe);
2542
2543  anonymous:
2544
2545         result = cli_rpc_pipe_open_noauth(conn->cli,
2546                                           &ndr_table_lsarpc.syntax_id,
2547                                           &conn->lsa_pipe);
2548         if (!NT_STATUS_IS_OK(result)) {
2549                 result = NT_STATUS_PIPE_NOT_AVAILABLE;
2550                 goto done;
2551         }
2552
2553         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2554                                         SEC_FLAG_MAXIMUM_ALLOWED,
2555                                         &conn->lsa_policy);
2556  done:
2557         if (!NT_STATUS_IS_OK(result)) {
2558                 invalidate_cm_connection(conn);
2559                 return result;
2560         }
2561
2562         *cli = conn->lsa_pipe;
2563         *lsa_policy = conn->lsa_policy;
2564         return result;
2565 }
2566
2567 /****************************************************************************
2568  Open the netlogon pipe to this DC. Use schannel if specified in client conf.
2569  session key stored in conn->netlogon_pipe->dc->sess_key.
2570 ****************************************************************************/
2571
2572 NTSTATUS cm_connect_netlogon(struct winbindd_domain *domain,
2573                              struct rpc_pipe_client **cli)
2574 {
2575         struct winbindd_cm_conn *conn;
2576         NTSTATUS result;
2577
2578         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
2579         uint8  mach_pwd[16];
2580         enum netr_SchannelType sec_chan_type;
2581         const char *account_name;
2582         struct rpc_pipe_client *netlogon_pipe = NULL;
2583
2584         *cli = NULL;
2585
2586         result = init_dc_connection_rpc(domain);
2587         if (!NT_STATUS_IS_OK(result)) {
2588                 return result;
2589         }
2590
2591         conn = &domain->conn;
2592
2593         if (rpccli_is_connected(conn->netlogon_pipe)) {
2594                 *cli = conn->netlogon_pipe;
2595                 return NT_STATUS_OK;
2596         }
2597
2598         TALLOC_FREE(conn->netlogon_pipe);
2599
2600         result = cli_rpc_pipe_open_noauth(conn->cli,
2601                                           &ndr_table_netlogon.syntax_id,
2602                                           &netlogon_pipe);
2603         if (!NT_STATUS_IS_OK(result)) {
2604                 return result;
2605         }
2606
2607         if ((!IS_DC) && (!domain->primary)) {
2608                 /* Clear the schannel request bit and drop down */
2609                 neg_flags &= ~NETLOGON_NEG_SCHANNEL;
2610                 goto no_schannel;
2611         }
2612
2613         if (lp_client_schannel() != False) {
2614                 neg_flags |= NETLOGON_NEG_SCHANNEL;
2615         }
2616
2617         if (!get_trust_pw_hash(domain->name, mach_pwd, &account_name,
2618                                &sec_chan_type))
2619         {
2620                 TALLOC_FREE(netlogon_pipe);
2621                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2622         }
2623
2624         result = rpccli_netlogon_setup_creds(
2625                  netlogon_pipe,
2626                  domain->dcname, /* server name. */
2627                  domain->name,   /* domain name */
2628                  lp_netbios_name(), /* client name */
2629                  account_name,   /* machine account */
2630                  mach_pwd,       /* machine password */
2631                  sec_chan_type,  /* from get_trust_pw */
2632                  &neg_flags);
2633
2634         if (!NT_STATUS_IS_OK(result)) {
2635                 TALLOC_FREE(netlogon_pipe);
2636                 return result;
2637         }
2638
2639         if ((lp_client_schannel() == True) &&
2640                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2641                 DEBUG(3, ("Server did not offer schannel\n"));
2642                 TALLOC_FREE(netlogon_pipe);
2643                 return NT_STATUS_ACCESS_DENIED;
2644         }
2645
2646  no_schannel:
2647         if ((lp_client_schannel() == False) ||
2648                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2649                 /*
2650                  * NetSamLogonEx only works for schannel
2651                  */
2652                 domain->can_do_samlogon_ex = False;
2653
2654                 /* We're done - just keep the existing connection to NETLOGON
2655                  * open */
2656                 conn->netlogon_pipe = netlogon_pipe;
2657                 *cli = conn->netlogon_pipe;
2658                 return NT_STATUS_OK;
2659         }
2660
2661         /* Using the credentials from the first pipe, open a signed and sealed
2662            second netlogon pipe. The session key is stored in the schannel
2663            part of the new pipe auth struct.
2664         */
2665
2666         result = cli_rpc_pipe_open_schannel_with_key(
2667                 conn->cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
2668                 DCERPC_AUTH_LEVEL_PRIVACY, domain->name, &netlogon_pipe->dc,
2669                 &conn->netlogon_pipe);
2670
2671         /* We can now close the initial netlogon pipe. */
2672         TALLOC_FREE(netlogon_pipe);
2673
2674         if (!NT_STATUS_IS_OK(result)) {
2675                 DEBUG(3, ("Could not open schannel'ed NETLOGON pipe. Error "
2676                           "was %s\n", nt_errstr(result)));
2677
2678                 invalidate_cm_connection(conn);
2679                 return result;
2680         }
2681
2682         /*
2683          * Always try netr_LogonSamLogonEx. We will fall back for NT4
2684          * which gives DCERPC_FAULT_OP_RNG_ERROR (function not
2685          * supported). We used to only try SamLogonEx for AD, but
2686          * Samba DCs can also do it. And because we don't distinguish
2687          * between Samba and NT4, always try it once.
2688          */
2689         domain->can_do_samlogon_ex = true;
2690
2691         *cli = conn->netlogon_pipe;
2692         return NT_STATUS_OK;
2693 }
2694
2695 void winbind_msg_ip_dropped(struct messaging_context *msg_ctx,
2696                             void *private_data,
2697                             uint32_t msg_type,
2698                             struct server_id server_id,
2699                             DATA_BLOB *data)
2700 {
2701         struct winbindd_domain *domain;
2702         char *freeit = NULL;
2703         char *addr;
2704
2705         if ((data == NULL)
2706             || (data->data == NULL)
2707             || (data->length == 0)
2708             || (data->data[data->length-1] != '\0')) {
2709                 DEBUG(1, ("invalid msg_ip_dropped message: not a valid "
2710                           "string\n"));
2711                 return;
2712         }
2713
2714         addr = (char *)data->data;
2715         DEBUG(10, ("IP %s dropped\n", addr));
2716
2717         if (!is_ipaddress(addr)) {
2718                 char *slash;
2719                 /*
2720                  * Some code sends us ip addresses with the /netmask
2721                  * suffix
2722                  */
2723                 slash = strchr(addr, '/');
2724                 if (slash == NULL) {
2725                         DEBUG(1, ("invalid msg_ip_dropped message: %s",
2726                                   addr));
2727                         return;
2728                 }
2729                 freeit = talloc_strndup(talloc_tos(), addr, slash-addr);
2730                 if (freeit == NULL) {
2731                         DEBUG(1, ("talloc failed\n"));
2732                         return;
2733                 }
2734                 addr = freeit;
2735                 DEBUG(10, ("Stripped /netmask to IP %s\n", addr));
2736         }
2737
2738         for (domain = domain_list(); domain != NULL; domain = domain->next) {
2739                 char sockaddr[INET6_ADDRSTRLEN];
2740
2741                 if (!cli_state_is_connected(domain->conn.cli)) {
2742                         continue;
2743                 }
2744
2745                 client_socket_addr(domain->conn.cli->fd, sockaddr,
2746                                    sizeof(sockaddr));
2747                 if (strequal(sockaddr, addr)) {
2748                         close(domain->conn.cli->fd);
2749                         domain->conn.cli->fd = -1;
2750                 }
2751         }
2752         TALLOC_FREE(freeit);
2753 }