source3/libsmb/dsgetdcname.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dsgetdcname
   5
   6    Copyright (C) Gerald Carter 2006
   7    Copyright (C) Guenther Deschner 2007-2008
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "libads/sitename_cache.h"
  25 #include "../librpc/gen_ndr/ndr_netlogon.h"
  26 #include "libads/cldap.h"
  27 #include "libads/dns.h"
  28 #include "libsmb/clidgram.h"
  29
  30 /* 15 minutes */
  31 #define DSGETDCNAME_CACHE_TTL   60*15
  32
  33 struct ip_service_name {
  34         struct sockaddr_storage ss;
  35         const char *hostname;
  36 };
  37
  38 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
  39                                               uint32_t flags,
  40                                               struct sockaddr_storage *ss,
  41                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
  42                                               struct netr_DsRGetDCNameInfo **info);
  43
  44 /****************************************************************
  45 ****************************************************************/
  46
  47 void debug_dsdcinfo_flags(int lvl, uint32_t flags)
  48 {
  49         DEBUG(lvl,("debug_dsdcinfo_flags: 0x%08x\n\t", flags));
  50
  51         if (flags & DS_FORCE_REDISCOVERY)
  52                 DEBUGADD(lvl,("DS_FORCE_REDISCOVERY "));
  53         if (flags & 0x000000002)
  54                 DEBUGADD(lvl,("0x00000002 "));
  55         if (flags & 0x000000004)
  56                 DEBUGADD(lvl,("0x00000004 "));
  57         if (flags & 0x000000008)
  58                 DEBUGADD(lvl,("0x00000008 "));
  59         if (flags & DS_DIRECTORY_SERVICE_REQUIRED)
  60                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_REQUIRED "));
  61         if (flags & DS_DIRECTORY_SERVICE_PREFERRED)
  62                 DEBUGADD(lvl,("DS_DIRECTORY_SERVICE_PREFERRED "));
  63         if (flags & DS_GC_SERVER_REQUIRED)
  64                 DEBUGADD(lvl,("DS_GC_SERVER_REQUIRED "));
  65         if (flags & DS_PDC_REQUIRED)
  66                 DEBUGADD(lvl,("DS_PDC_REQUIRED "));
  67         if (flags & DS_BACKGROUND_ONLY)
  68                 DEBUGADD(lvl,("DS_BACKGROUND_ONLY "));
  69         if (flags & DS_IP_REQUIRED)
  70                 DEBUGADD(lvl,("DS_IP_REQUIRED "));
  71         if (flags & DS_KDC_REQUIRED)
  72                 DEBUGADD(lvl,("DS_KDC_REQUIRED "));
  73         if (flags & DS_TIMESERV_REQUIRED)
  74                 DEBUGADD(lvl,("DS_TIMESERV_REQUIRED "));
  75         if (flags & DS_WRITABLE_REQUIRED)
  76                 DEBUGADD(lvl,("DS_WRITABLE_REQUIRED "));
  77         if (flags & DS_GOOD_TIMESERV_PREFERRED)
  78                 DEBUGADD(lvl,("DS_GOOD_TIMESERV_PREFERRED "));
  79         if (flags & DS_AVOID_SELF)
  80                 DEBUGADD(lvl,("DS_AVOID_SELF "));
  81         if (flags & DS_ONLY_LDAP_NEEDED)
  82                 DEBUGADD(lvl,("DS_ONLY_LDAP_NEEDED "));
  83         if (flags & DS_IS_FLAT_NAME)
  84                 DEBUGADD(lvl,("DS_IS_FLAT_NAME "));
  85         if (flags & DS_IS_DNS_NAME)
  86                 DEBUGADD(lvl,("DS_IS_DNS_NAME "));
  87         if (flags & 0x00040000)
  88                 DEBUGADD(lvl,("0x00040000 "));
  89         if (flags & 0x00080000)
  90                 DEBUGADD(lvl,("0x00080000 "));
  91         if (flags & 0x00100000)
  92                 DEBUGADD(lvl,("0x00100000 "));
  93         if (flags & 0x00200000)
  94                 DEBUGADD(lvl,("0x00200000 "));
  95         if (flags & 0x00400000)
  96                 DEBUGADD(lvl,("0x00400000 "));
  97         if (flags & 0x00800000)
  98                 DEBUGADD(lvl,("0x00800000 "));
  99         if (flags & 0x01000000)
 100                 DEBUGADD(lvl,("0x01000000 "));
 101         if (flags & 0x02000000)
 102                 DEBUGADD(lvl,("0x02000000 "));
 103         if (flags & 0x04000000)
 104                 DEBUGADD(lvl,("0x04000000 "));
 105         if (flags & 0x08000000)
 106                 DEBUGADD(lvl,("0x08000000 "));
 107         if (flags & 0x10000000)
 108                 DEBUGADD(lvl,("0x10000000 "));
 109         if (flags & 0x20000000)
 110                 DEBUGADD(lvl,("0x20000000 "));
 111         if (flags & DS_RETURN_DNS_NAME)
 112                 DEBUGADD(lvl,("DS_RETURN_DNS_NAME "));
 113         if (flags & DS_RETURN_FLAT_NAME)
 114                 DEBUGADD(lvl,("DS_RETURN_FLAT_NAME "));
 115         if (flags)
 116                 DEBUGADD(lvl,("\n"));
 117 }
 118
 119 /****************************************************************
 120 ****************************************************************/
 121
 122 static char *dsgetdcname_cache_key(TALLOC_CTX *mem_ctx, const char *domain)
 123 {
 124         if (!domain) {
 125                 return NULL;
 126         }
 127
 128         return talloc_asprintf_strupper_m(mem_ctx, "DSGETDCNAME/DOMAIN/%s",
 129                                           domain);
 130 }
 131
 132 /****************************************************************
 133 ****************************************************************/
 134
 135 static NTSTATUS dsgetdcname_cache_delete(TALLOC_CTX *mem_ctx,
 136                                         const char *domain_name)
 137 {
 138         char *key;
 139
 140         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 141         if (!key) {
 142                 return NT_STATUS_NO_MEMORY;
 143         }
 144
 145         if (!gencache_del(key)) {
 146                 return NT_STATUS_UNSUCCESSFUL;
 147         }
 148
 149         return NT_STATUS_OK;
 150 }
 151
 152 /****************************************************************
 153 ****************************************************************/
 154
 155 static NTSTATUS dsgetdcname_cache_store(TALLOC_CTX *mem_ctx,
 156                                         const char *domain_name,
 157                                         const DATA_BLOB *blob)
 158 {
 159         time_t expire_time;
 160         char *key;
 161         bool ret = false;
 162
 163         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 164         if (!key) {
 165                 return NT_STATUS_NO_MEMORY;
 166         }
 167
 168         expire_time = time(NULL) + DSGETDCNAME_CACHE_TTL;
 169
 170         ret = gencache_set_data_blob(key, blob, expire_time);
 171
 172         return ret ? NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
 173 }
 174
 175 /****************************************************************
 176 ****************************************************************/
 177
 178 static NTSTATUS store_cldap_reply(TALLOC_CTX *mem_ctx,
 179                                   uint32_t flags,
 180                                   struct sockaddr_storage *ss,
 181                                   uint32_t nt_version,
 182                                   struct NETLOGON_SAM_LOGON_RESPONSE_EX *r)
 183 {
 184         DATA_BLOB blob;
 185         enum ndr_err_code ndr_err;
 186         NTSTATUS status;
 187         char addr[INET6_ADDRSTRLEN];
 188
 189        print_sockaddr(addr, sizeof(addr), ss);
 190
 191         /* FIXME */
 192         r->sockaddr_size = 0x10; /* the w32 winsock addr size */
 193         r->sockaddr.sockaddr_family = 2; /* AF_INET */
 194         r->sockaddr.pdc_ip = talloc_strdup(mem_ctx, addr);
 195
 196         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, r,
 197                        (ndr_push_flags_fn_t)ndr_push_NETLOGON_SAM_LOGON_RESPONSE_EX);
 198         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 199                 return ndr_map_error2ntstatus(ndr_err);
 200         }
 201
 202         if (r->domain_name) {
 203                 status = dsgetdcname_cache_store(mem_ctx, r->domain_name, &blob);
 204                 if (!NT_STATUS_IS_OK(status)) {
 205                         goto done;
 206                 }
 207                 if (r->client_site) {
 208                         sitename_store(r->domain_name, r->client_site);
 209                 }
 210         }
 211         if (r->dns_domain) {
 212                 status = dsgetdcname_cache_store(mem_ctx, r->dns_domain, &blob);
 213                 if (!NT_STATUS_IS_OK(status)) {
 214                         goto done;
 215                 }
 216                 if (r->client_site) {
 217                         sitename_store(r->dns_domain, r->client_site);
 218                 }
 219         }
 220
 221         status = NT_STATUS_OK;
 222
 223  done:
 224         data_blob_free(&blob);
 225
 226         return status;
 227 }
 228
 229 /****************************************************************
 230 ****************************************************************/
 231
 232 static uint32_t get_cldap_reply_server_flags(struct netlogon_samlogon_response *r,
 233                                              uint32_t nt_version)
 234 {
 235         switch (nt_version & 0x0000001f) {
 236                 case 0:
 237                 case 1:
 238                 case 16:
 239                 case 17:
 240                         return 0;
 241                 case 2:
 242                 case 3:
 243                 case 18:
 244                 case 19:
 245                         return r->data.nt5.server_type;
 246                 case 4:
 247                 case 5:
 248                 case 6:
 249                 case 7:
 250                         return r->data.nt5_ex.server_type;
 251                 case 8:
 252                 case 9:
 253                 case 10:
 254                 case 11:
 255                 case 12:
 256                 case 13:
 257                 case 14:
 258                 case 15:
 259                         return r->data.nt5_ex.server_type;
 260                 case 20:
 261                 case 21:
 262                 case 22:
 263                 case 23:
 264                 case 24:
 265                 case 25:
 266                 case 26:
 267                 case 27:
 268                 case 28:
 269                         return r->data.nt5_ex.server_type;
 270                 case 29:
 271                 case 30:
 272                 case 31:
 273                         return r->data.nt5_ex.server_type;
 274                 default:
 275                         return 0;
 276         }
 277 }
 278
 279 /****************************************************************
 280 ****************************************************************/
 281
 282 #define RETURN_ON_FALSE(x) if (!(x)) return false;
 283
 284 static bool check_cldap_reply_required_flags(uint32_t ret_flags,
 285                                              uint32_t req_flags)
 286 {
 287         if (ret_flags == 0) {
 288                 return true;
 289         }
 290
 291         if (req_flags & DS_PDC_REQUIRED)
 292                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_PDC);
 293
 294         if (req_flags & DS_GC_SERVER_REQUIRED)
 295                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_GC);
 296
 297         if (req_flags & DS_ONLY_LDAP_NEEDED)
 298                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_LDAP);
 299
 300         if ((req_flags & DS_DIRECTORY_SERVICE_REQUIRED) ||
 301             (req_flags & DS_DIRECTORY_SERVICE_PREFERRED))
 302                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_DS);
 303
 304         if (req_flags & DS_KDC_REQUIRED)
 305                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_KDC);
 306
 307         if (req_flags & DS_TIMESERV_REQUIRED)
 308                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_TIMESERV);
 309
 310         if (req_flags & DS_WRITABLE_REQUIRED)
 311                 RETURN_ON_FALSE(ret_flags & NBT_SERVER_WRITABLE);
 312
 313         return true;
 314 }
 315
 316 /****************************************************************
 317 ****************************************************************/
 318
 319 static NTSTATUS dsgetdcname_cache_fetch(TALLOC_CTX *mem_ctx,
 320                                         const char *domain_name,
 321                                         const struct GUID *domain_guid,
 322                                         uint32_t flags,
 323                                         const char *site_name,
 324                                         struct netr_DsRGetDCNameInfo **info_p)
 325 {
 326         char *key;
 327         DATA_BLOB blob;
 328         enum ndr_err_code ndr_err;
 329         struct netr_DsRGetDCNameInfo *info;
 330         struct NETLOGON_SAM_LOGON_RESPONSE_EX r;
 331         NTSTATUS status;
 332
 333         key = dsgetdcname_cache_key(mem_ctx, domain_name);
 334         if (!key) {
 335                 return NT_STATUS_NO_MEMORY;
 336         }
 337
 338         if (!gencache_get_data_blob(key, &blob, NULL, NULL)) {
 339                 return NT_STATUS_NOT_FOUND;
 340         }
 341
 342         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 343         if (!info) {
 344                 return NT_STATUS_NO_MEMORY;
 345         }
 346
 347         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 348                       (ndr_pull_flags_fn_t)ndr_pull_NETLOGON_SAM_LOGON_RESPONSE_EX);
 349
 350         data_blob_free(&blob);
 351         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 352                 dsgetdcname_cache_delete(mem_ctx, domain_name);
 353                 return ndr_map_error2ntstatus(ndr_err);
 354         }
 355
 356         status = make_dc_info_from_cldap_reply(mem_ctx, flags, NULL,
 357                                                &r, &info);
 358         if (!NT_STATUS_IS_OK(status)) {
 359                 return status;
 360         }
 361
 362         if (DEBUGLEVEL >= 10) {
 363                 NDR_PRINT_DEBUG(netr_DsRGetDCNameInfo, info);
 364         }
 365
 366         /* check flags */
 367         if (!check_cldap_reply_required_flags(info->dc_flags, flags)) {
 368                 DEBUG(10,("invalid flags\n"));
 369                 return NT_STATUS_INVALID_PARAMETER;
 370         }
 371
 372         if ((flags & DS_IP_REQUIRED) &&
 373             (info->dc_address_type != DS_ADDRESS_TYPE_INET)) {
 374                 return NT_STATUS_INVALID_PARAMETER_MIX;
 375         }
 376
 377         *info_p = info;
 378
 379         return NT_STATUS_OK;
 380 }
 381
 382 /****************************************************************
 383 ****************************************************************/
 384
 385 static NTSTATUS dsgetdcname_cached(TALLOC_CTX *mem_ctx,
 386                                    struct messaging_context *msg_ctx,
 387                                    const char *domain_name,
 388                                    const struct GUID *domain_guid,
 389                                    uint32_t flags,
 390                                    const char *site_name,
 391                                    struct netr_DsRGetDCNameInfo **info)
 392 {
 393         NTSTATUS status;
 394
 395         status = dsgetdcname_cache_fetch(mem_ctx, domain_name, domain_guid,
 396                                          flags, site_name, info);
 397         if (!NT_STATUS_IS_OK(status)
 398             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 399                 DEBUG(10,("dsgetdcname_cached: cache fetch failed with: %s\n",
 400                         nt_errstr(status)));
 401                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 402         }
 403
 404         if (flags & DS_BACKGROUND_ONLY) {
 405                 return status;
 406         }
 407
 408         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 409                 struct netr_DsRGetDCNameInfo *dc_info;
 410
 411                 status = dsgetdcname(mem_ctx, msg_ctx, domain_name,
 412                                      domain_guid, site_name,
 413                                      flags | DS_FORCE_REDISCOVERY,
 414                                      &dc_info);
 415
 416                 if (!NT_STATUS_IS_OK(status)) {
 417                         return status;
 418                 }
 419
 420                 *info = dc_info;
 421         }
 422
 423         return status;
 424 }
 425
 426 /****************************************************************
 427 ****************************************************************/
 428
 429 static bool check_allowed_required_flags(uint32_t flags,
 430                                          const char *site_name)
 431 {
 432         uint32_t return_type = flags & (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME);
 433         uint32_t offered_type = flags & (DS_IS_FLAT_NAME|DS_IS_DNS_NAME);
 434         uint32_t query_type = flags & (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY);
 435
 436         /* FIXME: check for DSGETDC_VALID_FLAGS and check for excluse bits
 437          * (DS_PDC_REQUIRED, DS_KDC_REQUIRED, DS_GC_SERVER_REQUIRED) */
 438
 439         debug_dsdcinfo_flags(10, flags);
 440
 441         if ((flags & DS_TRY_NEXTCLOSEST_SITE) && site_name) {
 442                 return false;
 443         }
 444
 445         if (return_type == (DS_RETURN_FLAT_NAME|DS_RETURN_DNS_NAME)) {
 446                 return false;
 447         }
 448
 449         if (offered_type == (DS_IS_DNS_NAME|DS_IS_FLAT_NAME)) {
 450                 return false;
 451         }
 452
 453         if (query_type == (DS_BACKGROUND_ONLY|DS_FORCE_REDISCOVERY)) {
 454                 return false;
 455         }
 456
 457 #if 0
 458         if ((flags & DS_RETURN_DNS_NAME) && (!(flags & DS_IP_REQUIRED))) {
 459                 printf("gd: here5 \n");
 460                 return false;
 461         }
 462 #endif
 463         return true;
 464 }
 465
 466 /****************************************************************
 467 ****************************************************************/
 468
 469 static NTSTATUS discover_dc_netbios(TALLOC_CTX *mem_ctx,
 470                                     const char *domain_name,
 471                                     uint32_t flags,
 472                                     struct ip_service_name **returned_dclist,
 473                                     int *returned_count)
 474 {
 475         NTSTATUS status;
 476         enum nbt_name_type name_type = NBT_NAME_LOGON;
 477         struct ip_service *iplist;
 478         int i;
 479         struct ip_service_name *dclist = NULL;
 480         int count;
 481
 482         *returned_dclist = NULL;
 483         *returned_count = 0;
 484
 485         if (lp_disable_netbios()) {
 486                 return NT_STATUS_NOT_SUPPORTED;
 487         }
 488
 489         if (flags & DS_PDC_REQUIRED) {
 490                 name_type = NBT_NAME_PDC;
 491         }
 492
 493         status = internal_resolve_name(domain_name, name_type, NULL,
 494                                        &iplist, &count,
 495                                        "lmhosts wins bcast");
 496         if (!NT_STATUS_IS_OK(status)) {
 497                 DEBUG(10,("discover_dc_netbios: failed to find DC\n"));
 498                 return status;
 499         }
 500
 501         dclist = TALLOC_ZERO_ARRAY(mem_ctx, struct ip_service_name, count);
 502         if (!dclist) {
 503                 SAFE_FREE(iplist);
 504                 return NT_STATUS_NO_MEMORY;
 505         }
 506
 507         for (i=0; i<count; i++) {
 508
 509                 char addr[INET6_ADDRSTRLEN];
 510                 struct ip_service_name *r = &dclist[i];
 511
 512                 print_sockaddr(addr, sizeof(addr),
 513                                &iplist[i].ss);
 514
 515                 r->ss   = iplist[i].ss;
 516                 r->hostname = talloc_strdup(mem_ctx, addr);
 517                 if (!r->hostname) {
 518                         SAFE_FREE(iplist);
 519                         return NT_STATUS_NO_MEMORY;
 520                 }
 521
 522         }
 523
 524         *returned_dclist = dclist;
 525         *returned_count = count;
 526         SAFE_FREE(iplist);
 527
 528         return NT_STATUS_OK;
 529 }
 530
 531 /****************************************************************
 532 ****************************************************************/
 533
 534 static NTSTATUS discover_dc_dns(TALLOC_CTX *mem_ctx,
 535                                 const char *domain_name,
 536                                 const struct GUID *domain_guid,
 537                                 uint32_t flags,
 538                                 const char *site_name,
 539                                 struct ip_service_name **returned_dclist,
 540                                 int *return_count)
 541 {
 542         int i, j;
 543         NTSTATUS status;
 544         struct dns_rr_srv *dcs = NULL;
 545         int numdcs = 0;
 546         int numaddrs = 0;
 547         struct ip_service_name *dclist = NULL;
 548         int count = 0;
 549
 550         if (flags & DS_PDC_REQUIRED) {
 551                 status = ads_dns_query_pdc(mem_ctx, domain_name,
 552                                            &dcs, &numdcs);
 553         } else if (flags & DS_GC_SERVER_REQUIRED) {
 554                 status = ads_dns_query_gcs(mem_ctx, domain_name, site_name,
 555                                            &dcs, &numdcs);
 556         } else if (flags & DS_KDC_REQUIRED) {
 557                 status = ads_dns_query_kdcs(mem_ctx, domain_name, site_name,
 558                                             &dcs, &numdcs);
 559         } else if (flags & DS_DIRECTORY_SERVICE_REQUIRED) {
 560                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 561                                            &dcs, &numdcs);
 562         } else if (domain_guid) {
 563                 status = ads_dns_query_dcs_guid(mem_ctx, domain_name,
 564                                                 domain_guid, &dcs, &numdcs);
 565         } else {
 566                 status = ads_dns_query_dcs(mem_ctx, domain_name, site_name,
 567                                            &dcs, &numdcs);
 568         }
 569
 570         if (!NT_STATUS_IS_OK(status)) {
 571                 return status;
 572         }
 573
 574         if (numdcs == 0) {
 575                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 576         }
 577
 578         for (i=0;i<numdcs;i++) {
 579                 numaddrs += MAX(dcs[i].num_ips,1);
 580         }
 581
 582         dclist = TALLOC_ZERO_ARRAY(mem_ctx,
 583                                    struct ip_service_name,
 584                                    numaddrs);
 585         if (!dclist) {
 586                 return NT_STATUS_NO_MEMORY;
 587         }
 588
 589         /* now unroll the list of IP addresses */
 590
 591         *return_count = 0;
 592         i = 0;
 593         j = 0;
 594
 595         while ((i < numdcs) && (count < numaddrs)) {
 596
 597                 struct ip_service_name *r = &dclist[count];
 598
 599                 r->hostname = dcs[i].hostname;
 600
 601                 /* If we don't have an IP list for a name, lookup it up */
 602
 603                 if (!dcs[i].ss_s) {
 604                         interpret_string_addr_prefer_ipv4(&r->ss,
 605                                                 dcs[i].hostname, 0);
 606                         i++;
 607                         j = 0;
 608                 } else {
 609                         /* use the IP addresses from the SRV response */
 610
 611                         if (j >= dcs[i].num_ips) {
 612                                 i++;
 613                                 j = 0;
 614                                 continue;
 615                         }
 616
 617                         r->ss = dcs[i].ss_s[j];
 618                         j++;
 619                 }
 620
 621                 /* make sure it is a valid IP.  I considered checking the
 622                  * negative connection cache, but this is the wrong place for
 623                  * it.  Maybe only as a hack. After think about it, if all of
 624                  * the IP addresses returned from DNS are dead, what hope does a
 625                  * netbios name lookup have?  The standard reason for falling
 626                  * back to netbios lookups is that our DNS server doesn't know
 627                  * anything about the DC's   -- jerry */
 628
 629                 if (!is_zero_addr(&r->ss)) {
 630                         count++;
 631                         continue;
 632                 }
 633         }
 634
 635         *returned_dclist = dclist;
 636         *return_count = count;
 637
 638         if (count > 0) {
 639                 return NT_STATUS_OK;
 640         }
 641
 642         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 643 }
 644
 645 /****************************************************************
 646 ****************************************************************/
 647
 648 static NTSTATUS make_domain_controller_info(TALLOC_CTX *mem_ctx,
 649                                             const char *dc_unc,
 650                                             const char *dc_address,
 651                                             uint32_t dc_address_type,
 652                                             const struct GUID *domain_guid,
 653                                             const char *domain_name,
 654                                             const char *forest_name,
 655                                             uint32_t flags,
 656                                             const char *dc_site_name,
 657                                             const char *client_site_name,
 658                                             struct netr_DsRGetDCNameInfo **info_out)
 659 {
 660         struct netr_DsRGetDCNameInfo *info;
 661
 662         info = TALLOC_ZERO_P(mem_ctx, struct netr_DsRGetDCNameInfo);
 663         NT_STATUS_HAVE_NO_MEMORY(info);
 664
 665         if (dc_unc) {
 666                 info->dc_unc = talloc_strdup(mem_ctx, dc_unc);
 667                 NT_STATUS_HAVE_NO_MEMORY(info->dc_unc);
 668         }
 669
 670         if (dc_address) {
 671                 if (!(dc_address[0] == '\\' && dc_address[1] == '\\')) {
 672                         info->dc_address = talloc_asprintf(mem_ctx, "\\\\%s",
 673                                                            dc_address);
 674                 } else {
 675                         info->dc_address = talloc_strdup(mem_ctx, dc_address);
 676                 }
 677                 NT_STATUS_HAVE_NO_MEMORY(info->dc_address);
 678         }
 679
 680         info->dc_address_type = dc_address_type;
 681
 682         if (domain_guid) {
 683                 info->domain_guid = *domain_guid;
 684         }
 685
 686         if (domain_name) {
 687                 info->domain_name = talloc_strdup(mem_ctx, domain_name);
 688                 NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
 689         }
 690
 691         if (forest_name && *forest_name) {
 692                 info->forest_name = talloc_strdup(mem_ctx, forest_name);
 693                 NT_STATUS_HAVE_NO_MEMORY(info->forest_name);
 694                 flags |= DS_DNS_FOREST_ROOT;
 695         }
 696
 697         info->dc_flags = flags;
 698
 699         if (dc_site_name) {
 700                 info->dc_site_name = talloc_strdup(mem_ctx, dc_site_name);
 701                 NT_STATUS_HAVE_NO_MEMORY(info->dc_site_name);
 702         }
 703
 704         if (client_site_name) {
 705                 info->client_site_name = talloc_strdup(mem_ctx,
 706                                                        client_site_name);
 707                 NT_STATUS_HAVE_NO_MEMORY(info->client_site_name);
 708         }
 709
 710         *info_out = info;
 711
 712         return NT_STATUS_OK;
 713 }
 714
 715 /****************************************************************
 716 ****************************************************************/
 717
 718 static void map_dc_and_domain_names(uint32_t flags,
 719                                     const char *dc_name,
 720                                     const char *domain_name,
 721                                     const char *dns_dc_name,
 722                                     const char *dns_domain_name,
 723                                     uint32_t *dc_flags,
 724                                     const char **hostname_p,
 725                                     const char **domain_p)
 726 {
 727         switch (flags & 0xf0000000) {
 728                 case DS_RETURN_FLAT_NAME:
 729                         if (dc_name && domain_name &&
 730                             *dc_name && *domain_name) {
 731                                 *hostname_p = dc_name;
 732                                 *domain_p = domain_name;
 733                                 break;
 734                         }
 735                 case DS_RETURN_DNS_NAME:
 736                 default:
 737                         if (dns_dc_name && dns_domain_name &&
 738                             *dns_dc_name && *dns_domain_name) {
 739                                 *hostname_p = dns_dc_name;
 740                                 *domain_p = dns_domain_name;
 741                                 *dc_flags |= DS_DNS_DOMAIN | DS_DNS_CONTROLLER;
 742                                 break;
 743                         }
 744                         if (dc_name && domain_name &&
 745                             *dc_name && *domain_name) {
 746                                 *hostname_p = dc_name;
 747                                 *domain_p = domain_name;
 748                                 break;
 749                         }
 750         }
 751 }
 752
 753 /****************************************************************
 754 ****************************************************************/
 755
 756 static NTSTATUS make_dc_info_from_cldap_reply(TALLOC_CTX *mem_ctx,
 757                                               uint32_t flags,
 758                                               struct sockaddr_storage *ss,
 759                                               struct NETLOGON_SAM_LOGON_RESPONSE_EX *r,
 760                                               struct netr_DsRGetDCNameInfo **info)
 761 {
 762         const char *dc_hostname = NULL;
 763         const char *dc_domain_name = NULL;
 764         const char *dc_address = NULL;
 765         const char *dc_forest = NULL;
 766         uint32_t dc_address_type = 0;
 767         uint32_t dc_flags = 0;
 768         struct GUID *dc_domain_guid = NULL;
 769         const char *dc_server_site = NULL;
 770         const char *dc_client_site = NULL;
 771
 772         char addr[INET6_ADDRSTRLEN];
 773
 774         if (ss) {
 775                 print_sockaddr(addr, sizeof(addr), ss);
 776                 dc_address = addr;
 777                 dc_address_type = DS_ADDRESS_TYPE_INET;
 778         }
 779
 780         if (!ss && r->sockaddr.pdc_ip) {
 781                 dc_address      = r->sockaddr.pdc_ip;
 782                 dc_address_type = DS_ADDRESS_TYPE_INET;
 783         } else {
 784                 dc_address      = r->pdc_name;
 785                 dc_address_type = DS_ADDRESS_TYPE_NETBIOS;
 786         }
 787
 788         map_dc_and_domain_names(flags,
 789                                 r->pdc_name,
 790                                 r->domain_name,
 791                                 r->pdc_dns_name,
 792                                 r->dns_domain,
 793                                 &dc_flags,
 794                                 &dc_hostname,
 795                                 &dc_domain_name);
 796
 797         dc_flags        |= r->server_type;
 798         dc_forest       = r->forest;
 799         dc_domain_guid  = &r->domain_uuid;
 800         dc_server_site  = r->server_site;
 801         dc_client_site  = r->client_site;
 802
 803         return make_domain_controller_info(mem_ctx,
 804                                            dc_hostname,
 805                                            dc_address,
 806                                            dc_address_type,
 807                                            dc_domain_guid,
 808                                            dc_domain_name,
 809                                            dc_forest,
 810                                            dc_flags,
 811                                            dc_server_site,
 812                                            dc_client_site,
 813                                            info);
 814 }
 815
 816 /****************************************************************
 817 ****************************************************************/
 818
 819 static uint32_t map_ds_flags_to_nt_version(uint32_t flags)
 820 {
 821         uint32_t nt_version = 0;
 822
 823         if (flags & DS_PDC_REQUIRED) {
 824                 nt_version |= NETLOGON_NT_VERSION_PDC;
 825         }
 826
 827         if (flags & DS_GC_SERVER_REQUIRED) {
 828                 nt_version |= NETLOGON_NT_VERSION_GC;
 829         }
 830
 831         if (flags & DS_TRY_NEXTCLOSEST_SITE) {
 832                 nt_version |= NETLOGON_NT_VERSION_WITH_CLOSEST_SITE;
 833         }
 834
 835         if (flags & DS_IP_REQUIRED) {
 836                 nt_version |= NETLOGON_NT_VERSION_IP;
 837         }
 838
 839         return nt_version;
 840 }
 841
 842 /****************************************************************
 843 ****************************************************************/
 844
 845 static NTSTATUS process_dc_dns(TALLOC_CTX *mem_ctx,
 846                                const char *domain_name,
 847                                uint32_t flags,
 848                                struct ip_service_name *dclist,
 849                                int num_dcs,
 850                                struct netr_DsRGetDCNameInfo **info)
 851 {
 852         int i = 0;
 853         bool valid_dc = false;
 854         struct netlogon_samlogon_response *r = NULL;
 855         uint32_t nt_version = NETLOGON_NT_VERSION_5 |
 856                               NETLOGON_NT_VERSION_5EX;
 857         uint32_t ret_flags = 0;
 858         NTSTATUS status;
 859
 860         nt_version |= map_ds_flags_to_nt_version(flags);
 861
 862         for (i=0; i<num_dcs; i++) {
 863
 864
 865                 DEBUG(10,("LDAP ping to %s\n", dclist[i].hostname));
 866
 867                 if (ads_cldap_netlogon(mem_ctx, &dclist[i].ss,
 868                                         domain_name,
 869                                         nt_version,
 870                                         &r))
 871                 {
 872                         nt_version = r->ntver;
 873                         ret_flags = get_cldap_reply_server_flags(r, nt_version);
 874
 875                         if (check_cldap_reply_required_flags(ret_flags, flags)) {
 876                                 valid_dc = true;
 877                                 break;
 878                         }
 879                 }
 880
 881                 continue;
 882         }
 883
 884         if (!valid_dc) {
 885                 return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 886         }
 887
 888         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 889                                                &r->data.nt5_ex, info);
 890         if (NT_STATUS_IS_OK(status)) {
 891                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 892                                          nt_version, &r->data.nt5_ex);
 893         }
 894
 895         return status;
 896 }
 897
 898 /****************************************************************
 899 ****************************************************************/
 900
 901 /****************************************************************
 902 ****************************************************************/
 903
 904 static NTSTATUS process_dc_netbios(TALLOC_CTX *mem_ctx,
 905                                    struct messaging_context *msg_ctx,
 906                                    const char *domain_name,
 907                                    uint32_t flags,
 908                                    struct ip_service_name *dclist,
 909                                    int num_dcs,
 910                                    struct netr_DsRGetDCNameInfo **info)
 911 {
 912         struct sockaddr_storage ss;
 913         struct ip_service ip_list;
 914         enum nbt_name_type name_type = NBT_NAME_LOGON;
 915         NTSTATUS status;
 916         int i;
 917         const char *dc_name = NULL;
 918         fstring tmp_dc_name;
 919         struct netlogon_samlogon_response *r = NULL;
 920         bool store_cache = false;
 921         uint32_t nt_version = NETLOGON_NT_VERSION_1 |
 922                               NETLOGON_NT_VERSION_5 |
 923                               NETLOGON_NT_VERSION_5EX_WITH_IP;
 924
 925         if (msg_ctx == NULL) {
 926                 return NT_STATUS_INVALID_PARAMETER;
 927         }
 928
 929         if (flags & DS_PDC_REQUIRED) {
 930                 name_type = NBT_NAME_PDC;
 931         }
 932
 933         nt_version |= map_ds_flags_to_nt_version(flags);
 934
 935         DEBUG(10,("process_dc_netbios\n"));
 936
 937         for (i=0; i<num_dcs; i++) {
 938                 uint16_t val;
 939
 940                 generate_random_buffer((uint8_t *)&val, 2);
 941
 942                 ip_list.ss = dclist[i].ss;
 943                 ip_list.port = 0;
 944
 945                 if (!interpret_string_addr_prefer_ipv4(&ss, dclist[i].hostname, AI_NUMERICHOST)) {
 946                         return NT_STATUS_UNSUCCESSFUL;
 947                 }
 948
 949                 status = nbt_getdc(msg_ctx, &dclist[i].ss, domain_name,
 950                                    NULL, nt_version,
 951                                    mem_ctx, &nt_version, &dc_name, &r);
 952                 if (NT_STATUS_IS_OK(status)) {
 953                         store_cache = true;
 954                         namecache_store(dc_name, NBT_NAME_SERVER, 1, &ip_list);
 955                         goto make_reply;
 956                 }
 957
 958                 if (name_status_find(domain_name,
 959                                      name_type,
 960                                      NBT_NAME_SERVER,
 961                                      &dclist[i].ss,
 962                                      tmp_dc_name))
 963                 {
 964                         struct NETLOGON_SAM_LOGON_RESPONSE_NT40 logon1;
 965
 966                         r = TALLOC_ZERO_P(mem_ctx, struct netlogon_samlogon_response);
 967                         NT_STATUS_HAVE_NO_MEMORY(r);
 968
 969                         ZERO_STRUCT(logon1);
 970
 971                         nt_version = NETLOGON_NT_VERSION_1;
 972
 973                         logon1.nt_version = nt_version;
 974                         logon1.pdc_name = tmp_dc_name;
 975                         logon1.domain_name = talloc_strdup_upper(mem_ctx, domain_name);
 976                         NT_STATUS_HAVE_NO_MEMORY(logon1.domain_name);
 977
 978                         r->data.nt4 = logon1;
 979                         r->ntver = nt_version;
 980
 981                         map_netlogon_samlogon_response(r);
 982
 983                         namecache_store(tmp_dc_name, NBT_NAME_SERVER, 1, &ip_list);
 984
 985                         goto make_reply;
 986                 }
 987         }
 988
 989         return NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
 990
 991  make_reply:
 992
 993         status = make_dc_info_from_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 994                                                &r->data.nt5_ex, info);
 995         if (NT_STATUS_IS_OK(status) && store_cache) {
 996                 return store_cldap_reply(mem_ctx, flags, &dclist[i].ss,
 997                                          nt_version, &r->data.nt5_ex);
 998         }
 999
1000         return status;
1001 }
1002
1003 /****************************************************************
1004 ****************************************************************/
1005
1006 static NTSTATUS dsgetdcname_rediscover(TALLOC_CTX *mem_ctx,
1007                                        struct messaging_context *msg_ctx,
1008                                        const char *domain_name,
1009                                        const struct GUID *domain_guid,
1010                                        uint32_t flags,
1011                                        const char *site_name,
1012                                        struct netr_DsRGetDCNameInfo **info)
1013 {
1014         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1015         struct ip_service_name *dclist = NULL;
1016         int num_dcs;
1017
1018         DEBUG(10,("dsgetdcname_rediscover\n"));
1019
1020         if (flags & DS_IS_FLAT_NAME) {
1021
1022                 status = discover_dc_netbios(mem_ctx, domain_name, flags,
1023                                              &dclist, &num_dcs);
1024                 NT_STATUS_NOT_OK_RETURN(status);
1025
1026                 return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags,
1027                                           dclist, num_dcs, info);
1028         }
1029
1030         if (flags & DS_IS_DNS_NAME) {
1031
1032                 status = discover_dc_dns(mem_ctx, domain_name, domain_guid,
1033                                          flags, site_name, &dclist, &num_dcs);
1034                 NT_STATUS_NOT_OK_RETURN(status);
1035
1036                 return process_dc_dns(mem_ctx, domain_name, flags,
1037                                       dclist, num_dcs, info);
1038         }
1039
1040         status = discover_dc_dns(mem_ctx, domain_name, domain_guid, flags,
1041                                  site_name, &dclist, &num_dcs);
1042
1043         if (NT_STATUS_IS_OK(status) && num_dcs != 0) {
1044
1045                 status = process_dc_dns(mem_ctx, domain_name, flags, dclist,
1046                                         num_dcs, info);
1047                 if (NT_STATUS_IS_OK(status)) {
1048                         return status;
1049                 }
1050         }
1051
1052         status = discover_dc_netbios(mem_ctx, domain_name, flags, &dclist,
1053                                      &num_dcs);
1054         NT_STATUS_NOT_OK_RETURN(status);
1055
1056         return process_dc_netbios(mem_ctx, msg_ctx, domain_name, flags, dclist,
1057                                   num_dcs, info);
1058 }
1059
1060 static bool is_closest_site(struct netr_DsRGetDCNameInfo *info)
1061 {
1062         if (info->dc_flags & DS_SERVER_CLOSEST) {
1063                 return true;
1064         }
1065
1066         if (!info->client_site_name) {
1067                 return true;
1068         }
1069
1070         if (!info->dc_site_name) {
1071                 return false;
1072         }
1073
1074         if (strcmp(info->client_site_name, info->dc_site_name) == 0) {
1075                 return true;
1076         }
1077
1078         return false;
1079 }
1080
1081 /********************************************************************
1082  dsgetdcname.
1083
1084  This will be the only public function here.
1085 ********************************************************************/
1086
1087 NTSTATUS dsgetdcname(TALLOC_CTX *mem_ctx,
1088                      struct messaging_context *msg_ctx,
1089                      const char *domain_name,
1090                      const struct GUID *domain_guid,
1091                      const char *site_name,
1092                      uint32_t flags,
1093                      struct netr_DsRGetDCNameInfo **info)
1094 {
1095         NTSTATUS status = NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND;
1096         struct netr_DsRGetDCNameInfo *myinfo = NULL;
1097         char *query_site = NULL;
1098         bool first = true;
1099         struct netr_DsRGetDCNameInfo *first_info = NULL;
1100
1101         DEBUG(10,("dsgetdcname: domain_name: %s, "
1102                   "domain_guid: %s, site_name: %s, flags: 0x%08x\n",
1103                   domain_name,
1104                   domain_guid ? GUID_string(mem_ctx, domain_guid) : "(null)",
1105                   site_name, flags));
1106
1107         *info = NULL;
1108
1109         if (!check_allowed_required_flags(flags, site_name)) {
1110                 DEBUG(0,("invalid flags specified\n"));
1111                 return NT_STATUS_INVALID_PARAMETER;
1112         }
1113
1114         if ((site_name == NULL) || (site_name[0] == '\0')) {
1115                 query_site = sitename_fetch(domain_name);
1116         } else {
1117                 query_site = SMB_STRDUP(site_name);
1118         }
1119
1120         if (flags & DS_FORCE_REDISCOVERY) {
1121                 goto rediscover;
1122         }
1123
1124         status = dsgetdcname_cached(mem_ctx, msg_ctx, domain_name, domain_guid,
1125                                     flags, query_site, &myinfo);
1126         if (NT_STATUS_IS_OK(status)) {
1127                 goto done;
1128         }
1129
1130         if (flags & DS_BACKGROUND_ONLY) {
1131                 goto done;
1132         }
1133
1134  rediscover:
1135         status = dsgetdcname_rediscover(mem_ctx, msg_ctx, domain_name,
1136                                         domain_guid, flags, query_site,
1137                                         &myinfo);
1138
1139  done:
1140         SAFE_FREE(query_site);
1141
1142         if (!NT_STATUS_IS_OK(status)) {
1143                 if (!first) {
1144                         *info = first_info;
1145                         return NT_STATUS_OK;
1146                 }
1147                 return status;
1148         }
1149
1150         if (!first) {
1151                 TALLOC_FREE(first_info);
1152         } else if (!is_closest_site(myinfo)) {
1153                 first = false;
1154                 first_info = myinfo;
1155                 /* TODO: may use the next_closest_site here */
1156                 query_site = SMB_STRDUP(myinfo->client_site_name);
1157                 goto rediscover;
1158         }
1159
1160         *info = myinfo;
1161         return NT_STATUS_OK;
1162 }