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         const struct sockaddr *sa;
1446         socklen_t sa_len;
1447         char *key = NULL;
1448         char *value = NULL;
1449
1450         if (!cli_state_is_connected(cli)) {
1451                 return;
1452         }
1453
1454         sa = (const struct sockaddr *)(void *)&cli->dest_ss;
1455         sa_len = sizeof(cli->dest_ss);
1456
1457         print_sockaddr_len(addr, sizeof(addr),
1458                            sa, sa_len);
1459
1460         key = current_dc_key(talloc_tos(), domain_name);
1461         if (key == NULL) {
1462                 goto done;
1463         }
1464
1465         value = talloc_asprintf(talloc_tos(), "%s %s", addr, dc_name);
1466         if (value == NULL) {
1467                 goto done;
1468         }
1469
1470         gencache_set(key, value, 0x7fffffff);
1471 done:
1472         TALLOC_FREE(value);
1473         TALLOC_FREE(key);
1474 }
1475
1476 bool fetch_current_dc_from_gencache(TALLOC_CTX *mem_ctx,
1477                                     const char *domain_name,
1478                                     char **p_dc_name, char **p_dc_ip)
1479 {
1480         char *key, *value, *p;
1481         bool ret = false;
1482         char *dc_name = NULL;
1483         char *dc_ip = NULL;
1484
1485         key = current_dc_key(talloc_tos(), domain_name);
1486         if (key == NULL) {
1487                 goto done;
1488         }
1489         if (!gencache_get(key, &value, NULL)) {
1490                 goto done;
1491         }
1492         p = strchr(value, ' ');
1493         if (p == NULL) {
1494                 goto done;
1495         }
1496         dc_ip = talloc_strndup(mem_ctx, value, p - value);
1497         if (dc_ip == NULL) {
1498                 goto done;
1499         }
1500         dc_name = talloc_strdup(mem_ctx, p+1);
1501         if (dc_name == NULL) {
1502                 goto done;
1503         }
1504
1505         if (p_dc_ip != NULL) {
1506                 *p_dc_ip = dc_ip;
1507                 dc_ip = NULL;
1508         }
1509         if (p_dc_name != NULL) {
1510                 *p_dc_name = dc_name;
1511                 dc_name = NULL;
1512         }
1513         ret = true;
1514 done:
1515         TALLOC_FREE(dc_name);
1516         TALLOC_FREE(dc_ip);
1517         TALLOC_FREE(key);
1518         return ret;
1519 }
1520
1521 static NTSTATUS cm_open_connection(struct winbindd_domain *domain,
1522                                    struct winbindd_cm_conn *new_conn)
1523 {
1524         TALLOC_CTX *mem_ctx;
1525         NTSTATUS result;
1526         char *saf_servername = saf_fetch( domain->name );
1527         int retries;
1528
1529         if ((mem_ctx = talloc_init("cm_open_connection")) == NULL) {
1530                 SAFE_FREE(saf_servername);
1531                 set_domain_offline(domain);
1532                 return NT_STATUS_NO_MEMORY;
1533         }
1534
1535         /* we have to check the server affinity cache here since
1536            later we select a DC based on response time and not preference */
1537
1538         /* Check the negative connection cache
1539            before talking to it. It going down may have
1540            triggered the reconnection. */
1541
1542         if ( saf_servername && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, saf_servername))) {
1543
1544                 DEBUG(10,("cm_open_connection: saf_servername is '%s' for domain %s\n",
1545                         saf_servername, domain->name ));
1546
1547                 /* convert an ip address to a name */
1548                 if (is_ipaddress( saf_servername ) ) {
1549                         fstring saf_name;
1550                         struct sockaddr_storage ss;
1551
1552                         if (!interpret_string_addr(&ss, saf_servername,
1553                                                 AI_NUMERICHOST)) {
1554                                 return NT_STATUS_UNSUCCESSFUL;
1555                         }
1556                         if (dcip_to_name(mem_ctx, domain, &ss, saf_name )) {
1557                                 strlcpy(domain->dcname, saf_name, sizeof(domain->dcname));
1558                         } else {
1559                                 winbind_add_failed_connection_entry(
1560                                         domain, saf_servername,
1561                                         NT_STATUS_UNSUCCESSFUL);
1562                         }
1563                 } else {
1564                         fstrcpy( domain->dcname, saf_servername );
1565                 }
1566
1567                 SAFE_FREE( saf_servername );
1568         }
1569
1570         for (retries = 0; retries < 3; retries++) {
1571                 int fd = -1;
1572                 bool retry = False;
1573
1574                 result = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1575
1576                 DEBUG(10,("cm_open_connection: dcname is '%s' for domain %s\n",
1577                         domain->dcname, domain->name ));
1578
1579                 if (*domain->dcname
1580                         && NT_STATUS_IS_OK(check_negative_conn_cache( domain->name, domain->dcname))
1581                         && (resolve_name(domain->dcname, &domain->dcaddr, 0x20, true)))
1582                 {
1583                         NTSTATUS status;
1584
1585                         status = smbsock_connect(&domain->dcaddr, 0,
1586                                                  NULL, -1, NULL, -1,
1587                                                  &fd, NULL, 10);
1588                         if (!NT_STATUS_IS_OK(status)) {
1589                                 fd = -1;
1590                         }
1591                 }
1592
1593                 if ((fd == -1)
1594                         && !find_new_dc(mem_ctx, domain, domain->dcname, &domain->dcaddr, &fd))
1595                 {
1596                         /* This is the one place where we will
1597                            set the global winbindd offline state
1598                            to true, if a "WINBINDD_OFFLINE" entry
1599                            is found in the winbindd cache. */
1600                         set_global_winbindd_state_offline();
1601                         break;
1602                 }
1603
1604                 new_conn->cli = NULL;
1605
1606                 result = cm_prepare_connection(domain, fd, domain->dcname,
1607                         &new_conn->cli, &retry);
1608
1609                 if (!retry)
1610                         break;
1611         }
1612
1613         if (NT_STATUS_IS_OK(result)) {
1614
1615                 winbindd_set_locator_kdc_envs(domain);
1616
1617                 if (domain->online == False) {
1618                         /* We're changing state from offline to online. */
1619                         set_global_winbindd_state_online();
1620                 }
1621                 set_domain_online(domain);
1622
1623                 /*
1624                  * Much as I hate global state, this seems to be the point
1625                  * where we can be certain that we have a proper connection to
1626                  * a DC. wbinfo --dc-info needs that information, store it in
1627                  * gencache with a looong timeout. This will need revisiting
1628                  * once we start to connect to multiple DCs, wbcDcInfo is
1629                  * already prepared for that.
1630                  */
1631                 store_current_dc_in_gencache(domain->name, domain->dcname,
1632                                              new_conn->cli);
1633         } else {
1634                 /* Ensure we setup the retry handler. */
1635                 set_domain_offline(domain);
1636         }
1637
1638         talloc_destroy(mem_ctx);
1639         return result;
1640 }
1641
1642 /* Close down all open pipes on a connection. */
1643
1644 void invalidate_cm_connection(struct winbindd_cm_conn *conn)
1645 {
1646         NTSTATUS result;
1647
1648         /* We're closing down a possibly dead
1649            connection. Don't have impossibly long (10s) timeouts. */
1650
1651         if (conn->cli) {
1652                 cli_set_timeout(conn->cli, 1000); /* 1 second. */
1653         }
1654
1655         if (conn->samr_pipe != NULL) {
1656                 if (is_valid_policy_hnd(&conn->sam_connect_handle)) {
1657                         dcerpc_samr_Close(conn->samr_pipe->binding_handle,
1658                                           talloc_tos(),
1659                                           &conn->sam_connect_handle,
1660                                           &result);
1661                 }
1662                 TALLOC_FREE(conn->samr_pipe);
1663                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1664                 if (conn->cli) {
1665                         cli_set_timeout(conn->cli, 500);
1666                 }
1667         }
1668
1669         if (conn->lsa_pipe != NULL) {
1670                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1671                         dcerpc_lsa_Close(conn->lsa_pipe->binding_handle,
1672                                          talloc_tos(),
1673                                          &conn->lsa_policy,
1674                                          &result);
1675                 }
1676                 TALLOC_FREE(conn->lsa_pipe);
1677                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1678                 if (conn->cli) {
1679                         cli_set_timeout(conn->cli, 500);
1680                 }
1681         }
1682
1683         if (conn->lsa_pipe_tcp != NULL) {
1684                 if (is_valid_policy_hnd(&conn->lsa_policy)) {
1685                         dcerpc_lsa_Close(conn->lsa_pipe_tcp->binding_handle,
1686                                          talloc_tos(),
1687                                          &conn->lsa_policy,
1688                                          &result);
1689                 }
1690                 TALLOC_FREE(conn->lsa_pipe_tcp);
1691                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1692                 if (conn->cli) {
1693                         cli_set_timeout(conn->cli, 500);
1694                 }
1695         }
1696
1697         if (conn->netlogon_pipe != NULL) {
1698                 TALLOC_FREE(conn->netlogon_pipe);
1699                 /* Ok, it must be dead. Drop timeout to 0.5 sec. */
1700                 if (conn->cli) {
1701                         cli_set_timeout(conn->cli, 500);
1702                 }
1703         }
1704
1705         if (conn->cli) {
1706                 cli_shutdown(conn->cli);
1707         }
1708
1709         conn->cli = NULL;
1710 }
1711
1712 void close_conns_after_fork(void)
1713 {
1714         struct winbindd_domain *domain;
1715         struct winbindd_cli_state *cli_state;
1716
1717         for (domain = domain_list(); domain; domain = domain->next) {
1718                 /*
1719                  * first close the low level SMB TCP connection
1720                  * so that we don't generate any SMBclose
1721                  * requests in invalidate_cm_connection()
1722                  */
1723                 if (cli_state_is_connected(domain->conn.cli)) {
1724                         cli_state_disconnect(domain->conn.cli);
1725                 }
1726
1727                 invalidate_cm_connection(&domain->conn);
1728         }
1729
1730         for (cli_state = winbindd_client_list();
1731              cli_state != NULL;
1732              cli_state = cli_state->next) {
1733                 if (cli_state->sock >= 0) {
1734                         close(cli_state->sock);
1735                         cli_state->sock = -1;
1736                 }
1737         }
1738 }
1739
1740 static bool connection_ok(struct winbindd_domain *domain)
1741 {
1742         bool ok;
1743
1744         ok = cli_state_is_connected(domain->conn.cli);
1745         if (!ok) {
1746                 DEBUG(3, ("connection_ok: Connection to %s for domain %s is not connected\n",
1747                           domain->dcname, domain->name));
1748                 return False;
1749         }
1750
1751         if (domain->online == False) {
1752                 DEBUG(3, ("connection_ok: Domain %s is offline\n", domain->name));
1753                 return False;
1754         }
1755
1756         return True;
1757 }
1758
1759 /* Initialize a new connection up to the RPC BIND.
1760    Bypass online status check so always does network calls. */
1761
1762 static NTSTATUS init_dc_connection_network(struct winbindd_domain *domain)
1763 {
1764         NTSTATUS result;
1765
1766         /* Internal connections never use the network. */
1767         if (domain->internal) {
1768                 domain->initialized = True;
1769                 return NT_STATUS_OK;
1770         }
1771
1772         if (!winbindd_can_contact_domain(domain)) {
1773                 invalidate_cm_connection(&domain->conn);
1774                 domain->initialized = True;
1775                 return NT_STATUS_OK;
1776         }
1777
1778         if (connection_ok(domain)) {
1779                 if (!domain->initialized) {
1780                         set_dc_type_and_flags(domain);
1781                 }
1782                 return NT_STATUS_OK;
1783         }
1784
1785         invalidate_cm_connection(&domain->conn);
1786
1787         result = cm_open_connection(domain, &domain->conn);
1788
1789         if (NT_STATUS_IS_OK(result) && !domain->initialized) {
1790                 set_dc_type_and_flags(domain);
1791         }
1792
1793         return result;
1794 }
1795
1796 NTSTATUS init_dc_connection(struct winbindd_domain *domain)
1797 {
1798         if (domain->internal) {
1799                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
1800         }
1801
1802         if (domain->initialized && !domain->online) {
1803                 /* We check for online status elsewhere. */
1804                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1805         }
1806
1807         return init_dc_connection_network(domain);
1808 }
1809
1810 static NTSTATUS init_dc_connection_rpc(struct winbindd_domain *domain)
1811 {
1812         NTSTATUS status;
1813
1814         status = init_dc_connection(domain);
1815         if (!NT_STATUS_IS_OK(status)) {
1816                 return status;
1817         }
1818
1819         if (!domain->internal && domain->conn.cli == NULL) {
1820                 /* happens for trusted domains without inbound trust */
1821                 return NT_STATUS_TRUSTED_DOMAIN_FAILURE;
1822         }
1823
1824         return NT_STATUS_OK;
1825 }
1826
1827 /******************************************************************************
1828  Set the trust flags (direction and forest location) for a domain
1829 ******************************************************************************/
1830
1831 static bool set_dc_type_and_flags_trustinfo( struct winbindd_domain *domain )
1832 {
1833         struct winbindd_domain *our_domain;
1834         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
1835         WERROR werr;
1836         struct netr_DomainTrustList trusts;
1837         int i;
1838         uint32 flags = (NETR_TRUST_FLAG_IN_FOREST |
1839                         NETR_TRUST_FLAG_OUTBOUND |
1840                         NETR_TRUST_FLAG_INBOUND);
1841         struct rpc_pipe_client *cli;
1842         TALLOC_CTX *mem_ctx = NULL;
1843         struct dcerpc_binding_handle *b;
1844
1845         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s\n", domain->name ));
1846
1847         /* Our primary domain doesn't need to worry about trust flags.
1848            Force it to go through the network setup */
1849         if ( domain->primary ) {
1850                 return False;
1851         }
1852
1853         our_domain = find_our_domain();
1854
1855         if ( !connection_ok(our_domain) ) {
1856                 DEBUG(3,("set_dc_type_and_flags_trustinfo: No connection to our domain!\n"));
1857                 return False;
1858         }
1859
1860         /* This won't work unless our domain is AD */
1861
1862         if ( !our_domain->active_directory ) {
1863                 return False;
1864         }
1865
1866         /* Use DsEnumerateDomainTrusts to get us the trust direction
1867            and type */
1868
1869         result = cm_connect_netlogon(our_domain, &cli);
1870
1871         if (!NT_STATUS_IS_OK(result)) {
1872                 DEBUG(5, ("set_dc_type_and_flags_trustinfo: Could not open "
1873                           "a connection to %s for PIPE_NETLOGON (%s)\n",
1874                           domain->name, nt_errstr(result)));
1875                 return False;
1876         }
1877
1878         b = cli->binding_handle;
1879
1880         if ( (mem_ctx = talloc_init("set_dc_type_and_flags_trustinfo")) == NULL ) {
1881                 DEBUG(0,("set_dc_type_and_flags_trustinfo: talloc_init() failed!\n"));
1882                 return False;
1883         }
1884
1885         result = dcerpc_netr_DsrEnumerateDomainTrusts(b, mem_ctx,
1886                                                       cli->desthost,
1887                                                       flags,
1888                                                       &trusts,
1889                                                       &werr);
1890         if (!NT_STATUS_IS_OK(result)) {
1891                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1892                         "failed to query trusted domain list: %s\n",
1893                         nt_errstr(result)));
1894                 talloc_destroy(mem_ctx);
1895                 return false;
1896         }
1897         if (!W_ERROR_IS_OK(werr)) {
1898                 DEBUG(0,("set_dc_type_and_flags_trustinfo: "
1899                         "failed to query trusted domain list: %s\n",
1900                         win_errstr(werr)));
1901                 talloc_destroy(mem_ctx);
1902                 return false;
1903         }
1904
1905         /* Now find the domain name and get the flags */
1906
1907         for ( i=0; i<trusts.count; i++ ) {
1908                 if ( strequal( domain->name, trusts.array[i].netbios_name) ) {
1909                         domain->domain_flags          = trusts.array[i].trust_flags;
1910                         domain->domain_type           = trusts.array[i].trust_type;
1911                         domain->domain_trust_attribs  = trusts.array[i].trust_attributes;
1912
1913                         if ( domain->domain_type == NETR_TRUST_TYPE_UPLEVEL )
1914                                 domain->active_directory = True;
1915
1916                         /* This flag is only set if the domain is *our*
1917                            primary domain and the primary domain is in
1918                            native mode */
1919
1920                         domain->native_mode = (domain->domain_flags & NETR_TRUST_FLAG_NATIVE);
1921
1922                         DEBUG(5, ("set_dc_type_and_flags_trustinfo: domain %s is %sin "
1923                                   "native mode.\n", domain->name,
1924                                   domain->native_mode ? "" : "NOT "));
1925
1926                         DEBUG(5,("set_dc_type_and_flags_trustinfo: domain %s is %s"
1927                                  "running active directory.\n", domain->name,
1928                                  domain->active_directory ? "" : "NOT "));
1929
1930
1931                         domain->initialized = True;
1932
1933                         break;
1934                 }
1935         }
1936
1937         talloc_destroy( mem_ctx );
1938
1939         return domain->initialized;
1940 }
1941
1942 /******************************************************************************
1943  We can 'sense' certain things about the DC by it's replies to certain
1944  questions.
1945
1946  This tells us if this particular remote server is Active Directory, and if it
1947  is native mode.
1948 ******************************************************************************/
1949
1950 static void set_dc_type_and_flags_connect( struct winbindd_domain *domain )
1951 {
1952         NTSTATUS status, result;
1953         WERROR werr;
1954         TALLOC_CTX              *mem_ctx = NULL;
1955         struct rpc_pipe_client  *cli = NULL;
1956         struct policy_handle pol;
1957         union dssetup_DsRoleInfo info;
1958         union lsa_PolicyInformation *lsa_info = NULL;
1959
1960         if (!connection_ok(domain)) {
1961                 return;
1962         }
1963
1964         mem_ctx = talloc_init("set_dc_type_and_flags on domain %s\n",
1965                               domain->name);
1966         if (!mem_ctx) {
1967                 DEBUG(1, ("set_dc_type_and_flags_connect: talloc_init() failed\n"));
1968                 return;
1969         }
1970
1971         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s\n", domain->name ));
1972
1973         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
1974                                           &ndr_table_dssetup.syntax_id,
1975                                           &cli);
1976
1977         if (!NT_STATUS_IS_OK(status)) {
1978                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
1979                           "PI_DSSETUP on domain %s: (%s)\n",
1980                           domain->name, nt_errstr(status)));
1981
1982                 /* if this is just a non-AD domain we need to continue
1983                  * identifying so that we can in the end return with
1984                  * domain->initialized = True - gd */
1985
1986                 goto no_dssetup;
1987         }
1988
1989         status = dcerpc_dssetup_DsRoleGetPrimaryDomainInformation(cli->binding_handle, mem_ctx,
1990                                                                   DS_ROLE_BASIC_INFORMATION,
1991                                                                   &info,
1992                                                                   &werr);
1993         TALLOC_FREE(cli);
1994
1995         if (NT_STATUS_IS_OK(status)) {
1996                 result = werror_to_ntstatus(werr);
1997         }
1998         if (!NT_STATUS_IS_OK(status)) {
1999                 DEBUG(5, ("set_dc_type_and_flags_connect: rpccli_ds_getprimarydominfo "
2000                           "on domain %s failed: (%s)\n",
2001                           domain->name, nt_errstr(status)));
2002
2003                 /* older samba3 DCs will return DCERPC_FAULT_OP_RNG_ERROR for
2004                  * every opcode on the DSSETUP pipe, continue with
2005                  * no_dssetup mode here as well to get domain->initialized
2006                  * set - gd */
2007
2008                 if (NT_STATUS_EQUAL(status, NT_STATUS_RPC_PROCNUM_OUT_OF_RANGE)) {
2009                         goto no_dssetup;
2010                 }
2011
2012                 TALLOC_FREE(mem_ctx);
2013                 return;
2014         }
2015
2016         if ((info.basic.flags & DS_ROLE_PRIMARY_DS_RUNNING) &&
2017             !(info.basic.flags & DS_ROLE_PRIMARY_DS_MIXED_MODE)) {
2018                 domain->native_mode = True;
2019         } else {
2020                 domain->native_mode = False;
2021         }
2022
2023 no_dssetup:
2024         status = cli_rpc_pipe_open_noauth(domain->conn.cli,
2025                                           &ndr_table_lsarpc.syntax_id, &cli);
2026
2027         if (!NT_STATUS_IS_OK(status)) {
2028                 DEBUG(5, ("set_dc_type_and_flags_connect: Could not bind to "
2029                           "PI_LSARPC on domain %s: (%s)\n",
2030                           domain->name, nt_errstr(status)));
2031                 TALLOC_FREE(cli);
2032                 TALLOC_FREE(mem_ctx);
2033                 return;
2034         }
2035
2036         status = rpccli_lsa_open_policy2(cli, mem_ctx, True,
2037                                          SEC_FLAG_MAXIMUM_ALLOWED, &pol);
2038
2039         if (NT_STATUS_IS_OK(status)) {
2040                 /* This particular query is exactly what Win2k clients use
2041                    to determine that the DC is active directory */
2042                 status = dcerpc_lsa_QueryInfoPolicy2(cli->binding_handle, mem_ctx,
2043                                                      &pol,
2044                                                      LSA_POLICY_INFO_DNS,
2045                                                      &lsa_info,
2046                                                      &result);
2047         }
2048
2049         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2050                 domain->active_directory = True;
2051
2052                 if (lsa_info->dns.name.string) {
2053                         fstrcpy(domain->name, lsa_info->dns.name.string);
2054                 }
2055
2056                 if (lsa_info->dns.dns_domain.string) {
2057                         fstrcpy(domain->alt_name,
2058                                 lsa_info->dns.dns_domain.string);
2059                 }
2060
2061                 /* See if we can set some domain trust flags about
2062                    ourself */
2063
2064                 if (lsa_info->dns.dns_forest.string) {
2065                         fstrcpy(domain->forest_name,
2066                                 lsa_info->dns.dns_forest.string);
2067
2068                         if (strequal(domain->forest_name, domain->alt_name)) {
2069                                 domain->domain_flags |= NETR_TRUST_FLAG_TREEROOT;
2070                         }
2071                 }
2072
2073                 if (lsa_info->dns.sid) {
2074                         sid_copy(&domain->sid, lsa_info->dns.sid);
2075                 }
2076         } else {
2077                 domain->active_directory = False;
2078
2079                 status = rpccli_lsa_open_policy(cli, mem_ctx, True,
2080                                                 SEC_FLAG_MAXIMUM_ALLOWED,
2081                                                 &pol);
2082
2083                 if (!NT_STATUS_IS_OK(status)) {
2084                         goto done;
2085                 }
2086
2087                 status = dcerpc_lsa_QueryInfoPolicy(cli->binding_handle, mem_ctx,
2088                                                     &pol,
2089                                                     LSA_POLICY_INFO_ACCOUNT_DOMAIN,
2090                                                     &lsa_info,
2091                                                     &result);
2092                 if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2093
2094                         if (lsa_info->account_domain.name.string) {
2095                                 fstrcpy(domain->name,
2096                                         lsa_info->account_domain.name.string);
2097                         }
2098
2099                         if (lsa_info->account_domain.sid) {
2100                                 sid_copy(&domain->sid, lsa_info->account_domain.sid);
2101                         }
2102                 }
2103         }
2104 done:
2105
2106         DEBUG(5, ("set_dc_type_and_flags_connect: domain %s is %sin native mode.\n",
2107                   domain->name, domain->native_mode ? "" : "NOT "));
2108
2109         DEBUG(5,("set_dc_type_and_flags_connect: domain %s is %srunning active directory.\n",
2110                   domain->name, domain->active_directory ? "" : "NOT "));
2111
2112         domain->can_do_ncacn_ip_tcp = domain->active_directory;
2113         domain->can_do_validation6 = domain->active_directory;
2114
2115         TALLOC_FREE(cli);
2116
2117         TALLOC_FREE(mem_ctx);
2118
2119         domain->initialized = True;
2120 }
2121
2122 /**********************************************************************
2123  Set the domain_flags (trust attributes, domain operating modes, etc...
2124 ***********************************************************************/
2125
2126 static void set_dc_type_and_flags( struct winbindd_domain *domain )
2127 {
2128         /* we always have to contact our primary domain */
2129
2130         if ( domain->primary ) {
2131                 DEBUG(10,("set_dc_type_and_flags: setting up flags for "
2132                           "primary domain\n"));
2133                 set_dc_type_and_flags_connect( domain );
2134                 return;
2135         }
2136
2137         /* Use our DC to get the information if possible */
2138
2139         if ( !set_dc_type_and_flags_trustinfo( domain ) ) {
2140                 /* Otherwise, fallback to contacting the
2141                    domain directly */
2142                 set_dc_type_and_flags_connect( domain );
2143         }
2144
2145         return;
2146 }
2147
2148
2149
2150 /**********************************************************************
2151 ***********************************************************************/
2152
2153 static NTSTATUS cm_get_schannel_creds(struct winbindd_domain *domain,
2154                                    struct netlogon_creds_CredentialState **ppdc)
2155 {
2156         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2157         struct rpc_pipe_client *netlogon_pipe;
2158
2159         if (lp_client_schannel() == False) {
2160                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2161         }
2162
2163         result = cm_connect_netlogon(domain, &netlogon_pipe);
2164         if (!NT_STATUS_IS_OK(result)) {
2165                 return result;
2166         }
2167
2168         /* Return a pointer to the struct netlogon_creds_CredentialState from the
2169            netlogon pipe. */
2170
2171         if (!domain->conn.netlogon_pipe->dc) {
2172                 return NT_STATUS_INTERNAL_ERROR; /* This shouldn't happen. */
2173         }
2174
2175         *ppdc = domain->conn.netlogon_pipe->dc;
2176         return NT_STATUS_OK;
2177 }
2178
2179 NTSTATUS cm_connect_sam(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2180                         struct rpc_pipe_client **cli, struct policy_handle *sam_handle)
2181 {
2182         struct winbindd_cm_conn *conn;
2183         NTSTATUS status, result;
2184         struct netlogon_creds_CredentialState *p_creds;
2185         char *machine_password = NULL;
2186         char *machine_account = NULL;
2187         char *domain_name = NULL;
2188
2189         if (sid_check_is_domain(&domain->sid)) {
2190                 return open_internal_samr_conn(mem_ctx, domain, cli, sam_handle);
2191         }
2192
2193         status = init_dc_connection_rpc(domain);
2194         if (!NT_STATUS_IS_OK(status)) {
2195                 return status;
2196         }
2197
2198         conn = &domain->conn;
2199
2200         if (rpccli_is_connected(conn->samr_pipe)) {
2201                 goto done;
2202         }
2203
2204         TALLOC_FREE(conn->samr_pipe);
2205
2206         /*
2207          * No SAMR pipe yet. Attempt to get an NTLMSSP SPNEGO authenticated
2208          * sign and sealed pipe using the machine account password by
2209          * preference. If we can't - try schannel, if that fails, try
2210          * anonymous.
2211          */
2212
2213         if ((conn->cli->user_name[0] == '\0') ||
2214             (conn->cli->domain[0] == '\0') ||
2215             (conn->cli->password == NULL || conn->cli->password[0] == '\0'))
2216         {
2217                 status = get_trust_creds(domain, &machine_password,
2218                                          &machine_account, NULL);
2219                 if (!NT_STATUS_IS_OK(status)) {
2220                         DEBUG(10, ("cm_connect_sam: No no user available for "
2221                                    "domain %s, trying schannel\n", conn->cli->domain));
2222                         goto schannel;
2223                 }
2224                 domain_name = domain->name;
2225         } else {
2226                 machine_password = SMB_STRDUP(conn->cli->password);
2227                 machine_account = SMB_STRDUP(conn->cli->user_name);
2228                 domain_name = conn->cli->domain;
2229         }
2230
2231         if (!machine_password || !machine_account) {
2232                 status = NT_STATUS_NO_MEMORY;
2233                 goto done;
2234         }
2235
2236         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2237            authenticated SAMR pipe with sign & seal. */
2238         status = cli_rpc_pipe_open_spnego_ntlmssp(conn->cli,
2239                                                   &ndr_table_samr.syntax_id,
2240                                                   NCACN_NP,
2241                                                   DCERPC_AUTH_LEVEL_PRIVACY,
2242                                                   domain_name,
2243                                                   machine_account,
2244                                                   machine_password,
2245                                                   &conn->samr_pipe);
2246
2247         if (!NT_STATUS_IS_OK(status)) {
2248                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR "
2249                           "pipe for domain %s using NTLMSSP "
2250                           "authenticated pipe: user %s\\%s. Error was "
2251                           "%s\n", domain->name, domain_name,
2252                           machine_account, nt_errstr(status)));
2253                 goto schannel;
2254         }
2255
2256         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for "
2257                   "domain %s using NTLMSSP authenticated "
2258                   "pipe: user %s\\%s\n", domain->name,
2259                   domain_name, machine_account));
2260
2261         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2262                                       conn->samr_pipe->desthost,
2263                                       SEC_FLAG_MAXIMUM_ALLOWED,
2264                                       &conn->sam_connect_handle,
2265                                       &result);
2266         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2267                 goto open_domain;
2268         }
2269         if (NT_STATUS_IS_OK(status)) {
2270                 status = result;
2271         }
2272
2273         DEBUG(10,("cm_connect_sam: ntlmssp-sealed dcerpc_samr_Connect2 "
2274                   "failed for domain %s, error was %s. Trying schannel\n",
2275                   domain->name, nt_errstr(status) ));
2276         TALLOC_FREE(conn->samr_pipe);
2277
2278  schannel:
2279
2280         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2281
2282         status = cm_get_schannel_creds(domain, &p_creds);
2283         if (!NT_STATUS_IS_OK(status)) {
2284                 /* If this call fails - conn->cli can now be NULL ! */
2285                 DEBUG(10, ("cm_connect_sam: Could not get schannel auth info "
2286                            "for domain %s (error %s), trying anon\n",
2287                         domain->name,
2288                         nt_errstr(status) ));
2289                 goto anonymous;
2290         }
2291         status = cli_rpc_pipe_open_schannel_with_key
2292                 (conn->cli, &ndr_table_samr.syntax_id, NCACN_NP,
2293                  DCERPC_AUTH_LEVEL_PRIVACY,
2294                  domain->name, &p_creds, &conn->samr_pipe);
2295
2296         if (!NT_STATUS_IS_OK(status)) {
2297                 DEBUG(10,("cm_connect_sam: failed to connect to SAMR pipe for "
2298                           "domain %s using schannel. Error was %s\n",
2299                           domain->name, nt_errstr(status) ));
2300                 goto anonymous;
2301         }
2302         DEBUG(10,("cm_connect_sam: connected to SAMR pipe for domain %s using "
2303                   "schannel.\n", domain->name ));
2304
2305         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2306                                       conn->samr_pipe->desthost,
2307                                       SEC_FLAG_MAXIMUM_ALLOWED,
2308                                       &conn->sam_connect_handle,
2309                                       &result);
2310         if (NT_STATUS_IS_OK(status) && NT_STATUS_IS_OK(result)) {
2311                 goto open_domain;
2312         }
2313         if (NT_STATUS_IS_OK(status)) {
2314                 status = result;
2315         }
2316         DEBUG(10,("cm_connect_sam: schannel-sealed dcerpc_samr_Connect2 failed "
2317                   "for domain %s, error was %s. Trying anonymous\n",
2318                   domain->name, nt_errstr(status) ));
2319         TALLOC_FREE(conn->samr_pipe);
2320
2321  anonymous:
2322
2323         /* Finally fall back to anonymous. */
2324         status = cli_rpc_pipe_open_noauth(conn->cli, &ndr_table_samr.syntax_id,
2325                                           &conn->samr_pipe);
2326
2327         if (!NT_STATUS_IS_OK(status)) {
2328                 goto done;
2329         }
2330
2331         status = dcerpc_samr_Connect2(conn->samr_pipe->binding_handle, mem_ctx,
2332                                       conn->samr_pipe->desthost,
2333                                       SEC_FLAG_MAXIMUM_ALLOWED,
2334                                       &conn->sam_connect_handle,
2335                                       &result);
2336         if (!NT_STATUS_IS_OK(status)) {
2337                 DEBUG(10,("cm_connect_sam: rpccli_samr_Connect2 failed "
2338                           "for domain %s Error was %s\n",
2339                           domain->name, nt_errstr(status) ));
2340                 goto done;
2341         }
2342         if (!NT_STATUS_IS_OK(result)) {
2343                 status = result;
2344                 DEBUG(10,("cm_connect_sam: dcerpc_samr_Connect2 failed "
2345                           "for domain %s Error was %s\n",
2346                           domain->name, nt_errstr(result)));
2347                 goto done;
2348         }
2349
2350  open_domain:
2351         status = dcerpc_samr_OpenDomain(conn->samr_pipe->binding_handle,
2352                                         mem_ctx,
2353                                         &conn->sam_connect_handle,
2354                                         SEC_FLAG_MAXIMUM_ALLOWED,
2355                                         &domain->sid,
2356                                         &conn->sam_domain_handle,
2357                                         &result);
2358         if (!NT_STATUS_IS_OK(status)) {
2359                 goto done;
2360         }
2361
2362         status = result;
2363  done:
2364
2365         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
2366                 /*
2367                  * if we got access denied, we might just have no access rights
2368                  * to talk to the remote samr server server (e.g. when we are a
2369                  * PDC and we are connecting a w2k8 pdc via an interdomain
2370                  * trust). In that case do not invalidate the whole connection
2371                  * stack
2372                  */
2373                 TALLOC_FREE(conn->samr_pipe);
2374                 ZERO_STRUCT(conn->sam_domain_handle);
2375                 return status;
2376         } else if (!NT_STATUS_IS_OK(status)) {
2377                 invalidate_cm_connection(conn);
2378                 return status;
2379         }
2380
2381         *cli = conn->samr_pipe;
2382         *sam_handle = conn->sam_domain_handle;
2383         SAFE_FREE(machine_password);
2384         SAFE_FREE(machine_account);
2385         return status;
2386 }
2387
2388 /**********************************************************************
2389  open an schanneld ncacn_ip_tcp connection to LSA
2390 ***********************************************************************/
2391
2392 NTSTATUS cm_connect_lsa_tcp(struct winbindd_domain *domain,
2393                             TALLOC_CTX *mem_ctx,
2394                             struct rpc_pipe_client **cli)
2395 {
2396         struct winbindd_cm_conn *conn;
2397         struct netlogon_creds_CredentialState *creds;
2398         NTSTATUS status;
2399
2400         DEBUG(10,("cm_connect_lsa_tcp\n"));
2401
2402         status = init_dc_connection_rpc(domain);
2403         if (!NT_STATUS_IS_OK(status)) {
2404                 return status;
2405         }
2406
2407         conn = &domain->conn;
2408
2409         if (conn->lsa_pipe_tcp &&
2410             conn->lsa_pipe_tcp->transport->transport == NCACN_IP_TCP &&
2411             conn->lsa_pipe_tcp->auth->auth_level == DCERPC_AUTH_LEVEL_PRIVACY &&
2412             rpccli_is_connected(conn->lsa_pipe_tcp)) {
2413                 goto done;
2414         }
2415
2416         TALLOC_FREE(conn->lsa_pipe_tcp);
2417
2418         status = cm_get_schannel_creds(domain, &creds);
2419         if (!NT_STATUS_IS_OK(status)) {
2420                 goto done;
2421         }
2422
2423         status = cli_rpc_pipe_open_schannel_with_key(conn->cli,
2424                                                      &ndr_table_lsarpc.syntax_id,
2425                                                      NCACN_IP_TCP,
2426                                                      DCERPC_AUTH_LEVEL_PRIVACY,
2427                                                      domain->name,
2428                                                      &creds,
2429                                                      &conn->lsa_pipe_tcp);
2430         if (!NT_STATUS_IS_OK(status)) {
2431                 DEBUG(10,("cli_rpc_pipe_open_schannel_with_key failed: %s\n",
2432                         nt_errstr(status)));
2433                 goto done;
2434         }
2435
2436  done:
2437         if (!NT_STATUS_IS_OK(status)) {
2438                 TALLOC_FREE(conn->lsa_pipe_tcp);
2439                 return status;
2440         }
2441
2442         *cli = conn->lsa_pipe_tcp;
2443
2444         return status;
2445 }
2446
2447 NTSTATUS cm_connect_lsa(struct winbindd_domain *domain, TALLOC_CTX *mem_ctx,
2448                         struct rpc_pipe_client **cli, struct policy_handle *lsa_policy)
2449 {
2450         struct winbindd_cm_conn *conn;
2451         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
2452         struct netlogon_creds_CredentialState *p_creds;
2453
2454         result = init_dc_connection_rpc(domain);
2455         if (!NT_STATUS_IS_OK(result))
2456                 return result;
2457
2458         conn = &domain->conn;
2459
2460         if (rpccli_is_connected(conn->lsa_pipe)) {
2461                 goto done;
2462         }
2463
2464         TALLOC_FREE(conn->lsa_pipe);
2465
2466         if ((conn->cli->user_name[0] == '\0') ||
2467             (conn->cli->domain[0] == '\0') ||
2468             (conn->cli->password == NULL || conn->cli->password[0] == '\0')) {
2469                 DEBUG(10, ("cm_connect_lsa: No no user available for "
2470                            "domain %s, trying schannel\n", conn->cli->domain));
2471                 goto schannel;
2472         }
2473
2474         /* We have an authenticated connection. Use a NTLMSSP SPNEGO
2475          * authenticated LSA pipe with sign & seal. */
2476         result = cli_rpc_pipe_open_spnego_ntlmssp
2477                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2478                  DCERPC_AUTH_LEVEL_PRIVACY,
2479                  conn->cli->domain, conn->cli->user_name, conn->cli->password,
2480                  &conn->lsa_pipe);
2481
2482         if (!NT_STATUS_IS_OK(result)) {
2483                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2484                           "domain %s using NTLMSSP authenticated pipe: user "
2485                           "%s\\%s. Error was %s. Trying schannel.\n",
2486                           domain->name, conn->cli->domain,
2487                           conn->cli->user_name, nt_errstr(result)));
2488                 goto schannel;
2489         }
2490
2491         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2492                   "NTLMSSP authenticated pipe: user %s\\%s\n",
2493                   domain->name, conn->cli->domain, conn->cli->user_name ));
2494
2495         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2496                                         SEC_FLAG_MAXIMUM_ALLOWED,
2497                                         &conn->lsa_policy);
2498         if (NT_STATUS_IS_OK(result)) {
2499                 goto done;
2500         }
2501
2502         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2503                   "schannel\n"));
2504
2505         TALLOC_FREE(conn->lsa_pipe);
2506
2507  schannel:
2508
2509         /* Fall back to schannel if it's a W2K pre-SP1 box. */
2510
2511         result = cm_get_schannel_creds(domain, &p_creds);
2512         if (!NT_STATUS_IS_OK(result)) {
2513                 /* If this call fails - conn->cli can now be NULL ! */
2514                 DEBUG(10, ("cm_connect_lsa: Could not get schannel auth info "
2515                            "for domain %s (error %s), trying anon\n",
2516                         domain->name,
2517                         nt_errstr(result) ));
2518                 goto anonymous;
2519         }
2520         result = cli_rpc_pipe_open_schannel_with_key
2521                 (conn->cli, &ndr_table_lsarpc.syntax_id, NCACN_NP,
2522                  DCERPC_AUTH_LEVEL_PRIVACY,
2523                  domain->name, &p_creds, &conn->lsa_pipe);
2524
2525         if (!NT_STATUS_IS_OK(result)) {
2526                 DEBUG(10,("cm_connect_lsa: failed to connect to LSA pipe for "
2527                           "domain %s using schannel. Error was %s\n",
2528                           domain->name, nt_errstr(result) ));
2529                 goto anonymous;
2530         }
2531         DEBUG(10,("cm_connect_lsa: connected to LSA pipe for domain %s using "
2532                   "schannel.\n", domain->name ));
2533
2534         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2535                                         SEC_FLAG_MAXIMUM_ALLOWED,
2536                                         &conn->lsa_policy);
2537         if (NT_STATUS_IS_OK(result)) {
2538                 goto done;
2539         }
2540
2541         DEBUG(10,("cm_connect_lsa: rpccli_lsa_open_policy failed, trying "
2542                   "anonymous\n"));
2543
2544         TALLOC_FREE(conn->lsa_pipe);
2545
2546  anonymous:
2547
2548         result = cli_rpc_pipe_open_noauth(conn->cli,
2549                                           &ndr_table_lsarpc.syntax_id,
2550                                           &conn->lsa_pipe);
2551         if (!NT_STATUS_IS_OK(result)) {
2552                 result = NT_STATUS_PIPE_NOT_AVAILABLE;
2553                 goto done;
2554         }
2555
2556         result = rpccli_lsa_open_policy(conn->lsa_pipe, mem_ctx, True,
2557                                         SEC_FLAG_MAXIMUM_ALLOWED,
2558                                         &conn->lsa_policy);
2559  done:
2560         if (!NT_STATUS_IS_OK(result)) {
2561                 invalidate_cm_connection(conn);
2562                 return result;
2563         }
2564
2565         *cli = conn->lsa_pipe;
2566         *lsa_policy = conn->lsa_policy;
2567         return result;
2568 }
2569
2570 /****************************************************************************
2571  Open the netlogon pipe to this DC. Use schannel if specified in client conf.
2572  session key stored in conn->netlogon_pipe->dc->sess_key.
2573 ****************************************************************************/
2574
2575 NTSTATUS cm_connect_netlogon(struct winbindd_domain *domain,
2576                              struct rpc_pipe_client **cli)
2577 {
2578         struct winbindd_cm_conn *conn;
2579         NTSTATUS result;
2580
2581         uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
2582         uint8  mach_pwd[16];
2583         enum netr_SchannelType sec_chan_type;
2584         const char *account_name;
2585         struct rpc_pipe_client *netlogon_pipe = NULL;
2586
2587         *cli = NULL;
2588
2589         result = init_dc_connection_rpc(domain);
2590         if (!NT_STATUS_IS_OK(result)) {
2591                 return result;
2592         }
2593
2594         conn = &domain->conn;
2595
2596         if (rpccli_is_connected(conn->netlogon_pipe)) {
2597                 *cli = conn->netlogon_pipe;
2598                 return NT_STATUS_OK;
2599         }
2600
2601         TALLOC_FREE(conn->netlogon_pipe);
2602
2603         result = cli_rpc_pipe_open_noauth(conn->cli,
2604                                           &ndr_table_netlogon.syntax_id,
2605                                           &netlogon_pipe);
2606         if (!NT_STATUS_IS_OK(result)) {
2607                 return result;
2608         }
2609
2610         if ((!IS_DC) && (!domain->primary)) {
2611                 /* Clear the schannel request bit and drop down */
2612                 neg_flags &= ~NETLOGON_NEG_SCHANNEL;
2613                 goto no_schannel;
2614         }
2615
2616         if (lp_client_schannel() != False) {
2617                 neg_flags |= NETLOGON_NEG_SCHANNEL;
2618         }
2619
2620         if (!get_trust_pw_hash(domain->name, mach_pwd, &account_name,
2621                                &sec_chan_type))
2622         {
2623                 TALLOC_FREE(netlogon_pipe);
2624                 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
2625         }
2626
2627         result = rpccli_netlogon_setup_creds(
2628                  netlogon_pipe,
2629                  domain->dcname, /* server name. */
2630                  domain->name,   /* domain name */
2631                  lp_netbios_name(), /* client name */
2632                  account_name,   /* machine account */
2633                  mach_pwd,       /* machine password */
2634                  sec_chan_type,  /* from get_trust_pw */
2635                  &neg_flags);
2636
2637         if (!NT_STATUS_IS_OK(result)) {
2638                 TALLOC_FREE(netlogon_pipe);
2639                 return result;
2640         }
2641
2642         if ((lp_client_schannel() == True) &&
2643                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2644                 DEBUG(3, ("Server did not offer schannel\n"));
2645                 TALLOC_FREE(netlogon_pipe);
2646                 return NT_STATUS_ACCESS_DENIED;
2647         }
2648
2649  no_schannel:
2650         if ((lp_client_schannel() == False) ||
2651                         ((neg_flags & NETLOGON_NEG_SCHANNEL) == 0)) {
2652                 /*
2653                  * NetSamLogonEx only works for schannel
2654                  */
2655                 domain->can_do_samlogon_ex = False;
2656
2657                 /* We're done - just keep the existing connection to NETLOGON
2658                  * open */
2659                 conn->netlogon_pipe = netlogon_pipe;
2660                 *cli = conn->netlogon_pipe;
2661                 return NT_STATUS_OK;
2662         }
2663
2664         /* Using the credentials from the first pipe, open a signed and sealed
2665            second netlogon pipe. The session key is stored in the schannel
2666            part of the new pipe auth struct.
2667         */
2668
2669         result = cli_rpc_pipe_open_schannel_with_key(
2670                 conn->cli, &ndr_table_netlogon.syntax_id, NCACN_NP,
2671                 DCERPC_AUTH_LEVEL_PRIVACY, domain->name, &netlogon_pipe->dc,
2672                 &conn->netlogon_pipe);
2673
2674         /* We can now close the initial netlogon pipe. */
2675         TALLOC_FREE(netlogon_pipe);
2676
2677         if (!NT_STATUS_IS_OK(result)) {
2678                 DEBUG(3, ("Could not open schannel'ed NETLOGON pipe. Error "
2679                           "was %s\n", nt_errstr(result)));
2680
2681                 invalidate_cm_connection(conn);
2682                 return result;
2683         }
2684
2685         /*
2686          * Always try netr_LogonSamLogonEx. We will fall back for NT4
2687          * which gives DCERPC_FAULT_OP_RNG_ERROR (function not
2688          * supported). We used to only try SamLogonEx for AD, but
2689          * Samba DCs can also do it. And because we don't distinguish
2690          * between Samba and NT4, always try it once.
2691          */
2692         domain->can_do_samlogon_ex = true;
2693
2694         *cli = conn->netlogon_pipe;
2695         return NT_STATUS_OK;
2696 }
2697
2698 void winbind_msg_ip_dropped(struct messaging_context *msg_ctx,
2699                             void *private_data,
2700                             uint32_t msg_type,
2701                             struct server_id server_id,
2702                             DATA_BLOB *data)
2703 {
2704         struct winbindd_domain *domain;
2705         char *freeit = NULL;
2706         char *addr;
2707
2708         if ((data == NULL)
2709             || (data->data == NULL)
2710             || (data->length == 0)
2711             || (data->data[data->length-1] != '\0')) {
2712                 DEBUG(1, ("invalid msg_ip_dropped message: not a valid "
2713                           "string\n"));
2714                 return;
2715         }
2716
2717         addr = (char *)data->data;
2718         DEBUG(10, ("IP %s dropped\n", addr));
2719
2720         if (!is_ipaddress(addr)) {
2721                 char *slash;
2722                 /*
2723                  * Some code sends us ip addresses with the /netmask
2724                  * suffix
2725                  */
2726                 slash = strchr(addr, '/');
2727                 if (slash == NULL) {
2728                         DEBUG(1, ("invalid msg_ip_dropped message: %s",
2729                                   addr));
2730                         return;
2731                 }
2732                 freeit = talloc_strndup(talloc_tos(), addr, slash-addr);
2733                 if (freeit == NULL) {
2734                         DEBUG(1, ("talloc failed\n"));
2735                         return;
2736                 }
2737                 addr = freeit;
2738                 DEBUG(10, ("Stripped /netmask to IP %s\n", addr));
2739         }
2740
2741         for (domain = domain_list(); domain != NULL; domain = domain->next) {
2742                 char sockaddr[INET6_ADDRSTRLEN];
2743                 const struct sockaddr *sa;
2744                 socklen_t sa_len;
2745
2746                 if (!cli_state_is_connected(domain->conn.cli)) {
2747                         continue;
2748                 }
2749
2750                 sa = (const struct sockaddr *)(void *)&domain->conn.cli->src_ss;
2751                 sa_len = sizeof(domain->conn.cli->src_ss);
2752
2753                 print_sockaddr_len(sockaddr, sizeof(sockaddr),
2754                                    sa, sa_len);
2755
2756                 if (strequal(sockaddr, addr)) {
2757                         cli_state_disconnect(domain->conn.cli);
2758                 }
2759         }
2760         TALLOC_FREE(freeit);
2761 }