source3/auth/server_info.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Authentication utility functions
   4    Copyright (C) Volker Lendecke 2010
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "auth.h"
  22 #include "../lib/crypto/arcfour.h"
  23 #include "../librpc/gen_ndr/netlogon.h"
  24 #include "../libcli/security/security.h"
  25 #include "rpc_client/util_netlogon.h"
  26 #include "nsswitch/libwbclient/wbclient.h"
  27 #include "lib/winbind_util.h"
  28 #include "passdb.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_AUTH
  32
  33 /***************************************************************************
  34  Make a server_info struct. Free with TALLOC_FREE().
  35 ***************************************************************************/
  36
  37 struct auth_serversupplied_info *make_server_info(TALLOC_CTX *mem_ctx)
  38 {
  39         struct auth_serversupplied_info *result;
  40
  41         result = talloc_zero(mem_ctx, struct auth_serversupplied_info);
  42         if (result == NULL) {
  43                 DEBUG(0, ("talloc failed\n"));
  44                 return NULL;
  45         }
  46
  47         /* Initialise the uid and gid values to something non-zero
  48            which may save us from giving away root access if there
  49            is a bug in allocating these fields. */
  50
  51         result->utok.uid = -1;
  52         result->utok.gid = -1;
  53
  54         return result;
  55 }
  56
  57 /****************************************************************************
  58  inits a netr_SamInfo2 structure from an auth_serversupplied_info. sam2 must
  59  already be initialized and is used as the talloc parent for its members.
  60 *****************************************************************************/
  61
  62 NTSTATUS serverinfo_to_SamInfo2(struct auth_serversupplied_info *server_info,
  63                                 struct netr_SamInfo2 *sam2)
  64 {
  65         struct netr_SamInfo3 *info3;
  66
  67         info3 = copy_netr_SamInfo3(sam2, server_info->info3);
  68         if (!info3) {
  69                 return NT_STATUS_NO_MEMORY;
  70         }
  71
  72         if (server_info->session_key.length) {
  73                 memcpy(info3->base.key.key,
  74                        server_info->session_key.data,
  75                        MIN(sizeof(info3->base.key.key),
  76                            server_info->session_key.length));
  77         }
  78         if (server_info->lm_session_key.length) {
  79                 memcpy(info3->base.LMSessKey.key,
  80                        server_info->lm_session_key.data,
  81                        MIN(sizeof(info3->base.LMSessKey.key),
  82                            server_info->lm_session_key.length));
  83         }
  84
  85         sam2->base = info3->base;
  86
  87         return NT_STATUS_OK;
  88 }
  89
  90 /****************************************************************************
  91  inits a netr_SamInfo3 structure from an auth_serversupplied_info. sam3 must
  92  already be initialized and is used as the talloc parent for its members.
  93 *****************************************************************************/
  94
  95 NTSTATUS serverinfo_to_SamInfo3(const struct auth_serversupplied_info *server_info,
  96                                 struct netr_SamInfo3 *sam3)
  97 {
  98         struct netr_SamInfo3 *info3;
  99
 100         info3 = copy_netr_SamInfo3(sam3, server_info->info3);
 101         if (!info3) {
 102                 return NT_STATUS_NO_MEMORY;
 103         }
 104
 105         if (server_info->session_key.length) {
 106                 memcpy(info3->base.key.key,
 107                        server_info->session_key.data,
 108                        MIN(sizeof(info3->base.key.key),
 109                            server_info->session_key.length));
 110         }
 111         if (server_info->lm_session_key.length) {
 112                 memcpy(info3->base.LMSessKey.key,
 113                        server_info->lm_session_key.data,
 114                        MIN(sizeof(info3->base.LMSessKey.key),
 115                            server_info->lm_session_key.length));
 116         }
 117
 118         sam3->base = info3->base;
 119
 120         sam3->sidcount          = 0;
 121         sam3->sids              = NULL;
 122
 123         return NT_STATUS_OK;
 124 }
 125
 126 /****************************************************************************
 127  inits a netr_SamInfo6 structure from an auth_serversupplied_info. sam6 must
 128  already be initialized and is used as the talloc parent for its members.
 129 *****************************************************************************/
 130
 131 NTSTATUS serverinfo_to_SamInfo6(struct auth_serversupplied_info *server_info,
 132                                 struct netr_SamInfo6 *sam6)
 133 {
 134         struct pdb_domain_info *dominfo;
 135         struct netr_SamInfo3 *info3;
 136
 137         if ((pdb_capabilities() & PDB_CAP_ADS) == 0) {
 138                 DEBUG(10,("Not adding validation info level 6 "
 139                            "without ADS passdb backend\n"));
 140                 return NT_STATUS_INVALID_INFO_CLASS;
 141         }
 142
 143         dominfo = pdb_get_domain_info(sam6);
 144         if (dominfo == NULL) {
 145                 return NT_STATUS_NO_MEMORY;
 146         }
 147
 148         info3 = copy_netr_SamInfo3(sam6, server_info->info3);
 149         if (!info3) {
 150                 return NT_STATUS_NO_MEMORY;
 151         }
 152
 153         if (server_info->session_key.length) {
 154                 memcpy(info3->base.key.key,
 155                        server_info->session_key.data,
 156                        MIN(sizeof(info3->base.key.key),
 157                            server_info->session_key.length));
 158         }
 159         if (server_info->lm_session_key.length) {
 160                 memcpy(info3->base.LMSessKey.key,
 161                        server_info->lm_session_key.data,
 162                        MIN(sizeof(info3->base.LMSessKey.key),
 163                            server_info->lm_session_key.length));
 164         }
 165
 166         sam6->base = info3->base;
 167
 168         sam6->sidcount          = 0;
 169         sam6->sids              = NULL;
 170
 171         sam6->dns_domainname.string = talloc_strdup(sam6, dominfo->dns_domain);
 172         if (sam6->dns_domainname.string == NULL) {
 173                 return NT_STATUS_NO_MEMORY;
 174         }
 175
 176         sam6->principle.string  = talloc_asprintf(sam6, "%s@%s",
 177                                                   sam6->base.account_name.string,
 178                                                   sam6->dns_domainname.string);
 179         if (sam6->principle.string == NULL) {
 180                 return NT_STATUS_NO_MEMORY;
 181         }
 182
 183         return NT_STATUS_OK;
 184 }
 185
 186 static NTSTATUS append_netr_SidAttr(TALLOC_CTX *mem_ctx,
 187                                     struct netr_SidAttr **sids,
 188                                     uint32_t *count,
 189                                     const struct dom_sid2 *asid,
 190                                     uint32_t attributes)
 191 {
 192         uint32_t t = *count;
 193
 194         *sids = talloc_realloc(mem_ctx, *sids, struct netr_SidAttr, t + 1);
 195         if (*sids == NULL) {
 196                 return NT_STATUS_NO_MEMORY;
 197         }
 198         (*sids)[t].sid = dom_sid_dup(*sids, asid);
 199         if ((*sids)[t].sid == NULL) {
 200                 return NT_STATUS_NO_MEMORY;
 201         }
 202         (*sids)[t].attributes = attributes;
 203         *count = t + 1;
 204
 205         return NT_STATUS_OK;
 206 }
 207
 208 /* Fills the samr_RidWithAttributeArray with the provided sids.
 209  * If it happens that we have additional groups that do not belong
 210  * to the domain, add their sids as extra sids */
 211 static NTSTATUS group_sids_to_info3(struct netr_SamInfo3 *info3,
 212                                     const struct dom_sid *sids,
 213                                     size_t num_sids)
 214 {
 215         uint32_t attributes = SE_GROUP_MANDATORY |
 216                                 SE_GROUP_ENABLED_BY_DEFAULT |
 217                                 SE_GROUP_ENABLED;
 218         struct samr_RidWithAttributeArray *groups;
 219         struct dom_sid *domain_sid;
 220         unsigned int i;
 221         NTSTATUS status;
 222         uint32_t rid;
 223         bool ok;
 224
 225         domain_sid = info3->base.domain_sid;
 226         groups = &info3->base.groups;
 227
 228         groups->rids = talloc_array(info3,
 229                                     struct samr_RidWithAttribute, num_sids);
 230         if (!groups->rids) {
 231                 return NT_STATUS_NO_MEMORY;
 232         }
 233
 234         for (i = 0; i < num_sids; i++) {
 235                 ok = sid_peek_check_rid(domain_sid, &sids[i], &rid);
 236                 if (ok) {
 237                         /* store domain group rid */
 238                         groups->rids[groups->count].rid = rid;
 239                         groups->rids[groups->count].attributes = attributes;
 240                         groups->count++;
 241                         continue;
 242                 }
 243
 244                 /* if this wasn't a domain sid, add it as extra sid */
 245                 status = append_netr_SidAttr(info3, &info3->sids,
 246                                              &info3->sidcount,
 247                                              &sids[i], attributes);
 248                 if (!NT_STATUS_IS_OK(status)) {
 249                         return status;
 250                 }
 251         }
 252
 253         return NT_STATUS_OK;
 254 }
 255
 256 #define RET_NOMEM(ptr) do { \
 257         if (!ptr) { \
 258                 TALLOC_FREE(info3); \
 259                 return NT_STATUS_NO_MEMORY; \
 260         } } while(0)
 261
 262 NTSTATUS samu_to_SamInfo3(TALLOC_CTX *mem_ctx,
 263                           struct samu *samu,
 264                           const char *login_server,
 265                           struct netr_SamInfo3 **_info3,
 266                           struct extra_auth_info *extra)
 267 {
 268         struct netr_SamInfo3 *info3;
 269         const struct dom_sid *user_sid;
 270         const struct dom_sid *group_sid;
 271         struct dom_sid domain_sid;
 272         struct dom_sid *group_sids;
 273         uint32_t num_group_sids = 0;
 274         const char *tmp;
 275         gid_t *gids;
 276         NTSTATUS status;
 277         bool ok;
 278
 279         user_sid = pdb_get_user_sid(samu);
 280         group_sid = pdb_get_group_sid(samu);
 281
 282         if (!user_sid || !group_sid) {
 283                 DEBUG(1, ("Sam account is missing sids!\n"));
 284                 return NT_STATUS_UNSUCCESSFUL;
 285         }
 286
 287         info3 = talloc_zero(mem_ctx, struct netr_SamInfo3);
 288         if (!info3) {
 289                 return NT_STATUS_NO_MEMORY;
 290         }
 291
 292         ZERO_STRUCT(domain_sid);
 293
 294         /* check if this is a "Unix Users" domain user,
 295          * we need to handle it in a special way if that's the case */
 296         if (sid_check_is_in_unix_users(user_sid)) {
 297                 /* in info3 you can only set rids for the user and the
 298                  * primary group, and the domain sid must be that of
 299                  * the sam domain.
 300                  *
 301                  * Store a completely bogus value here.
 302                  * The real SID is stored in the extra sids.
 303                  * Other code will know to look there if (-1) is found
 304                  */
 305                 info3->base.rid = (uint32_t)(-1);
 306                 sid_copy(&extra->user_sid, user_sid);
 307
 308                 DEBUG(10, ("Unix User found in struct samu. Rid marked as "
 309                            "special and sid (%s) saved as extra sid\n",
 310                            sid_string_dbg(user_sid)));
 311         } else {
 312                 sid_copy(&domain_sid, user_sid);
 313                 sid_split_rid(&domain_sid, &info3->base.rid);
 314         }
 315
 316         if (is_null_sid(&domain_sid)) {
 317                 sid_copy(&domain_sid, get_global_sam_sid());
 318         }
 319
 320         /* check if this is a "Unix Groups" domain group,
 321          * if so we need special handling */
 322         if (sid_check_is_in_unix_groups(group_sid)) {
 323                 /* in info3 you can only set rids for the user and the
 324                  * primary group, and the domain sid must be that of
 325                  * the sam domain.
 326                  *
 327                  * Store a completely bogus value here.
 328                  * The real SID is stored in the extra sids.
 329                  * Other code will know to look there if (-1) is found
 330                  */
 331                 info3->base.primary_gid = (uint32_t)(-1);
 332                 sid_copy(&extra->pgid_sid, group_sid);
 333
 334                 DEBUG(10, ("Unix Group found in struct samu. Rid marked as "
 335                            "special and sid (%s) saved as extra sid\n",
 336                            sid_string_dbg(group_sid)));
 337
 338         } else {
 339                 ok = sid_peek_check_rid(&domain_sid, group_sid,
 340                                         &info3->base.primary_gid);
 341                 if (!ok) {
 342                         DEBUG(1, ("The primary group domain sid(%s) does not "
 343                                   "match the domain sid(%s) for %s(%s)\n",
 344                                   sid_string_dbg(group_sid),
 345                                   sid_string_dbg(&domain_sid),
 346                                   pdb_get_username(samu),
 347                                   sid_string_dbg(user_sid)));
 348                         TALLOC_FREE(info3);
 349                         return NT_STATUS_UNSUCCESSFUL;
 350                 }
 351         }
 352
 353         unix_to_nt_time(&info3->base.logon_time, pdb_get_logon_time(samu));
 354         unix_to_nt_time(&info3->base.logoff_time, get_time_t_max());
 355         unix_to_nt_time(&info3->base.kickoff_time, get_time_t_max());
 356         unix_to_nt_time(&info3->base.last_password_change,
 357                         pdb_get_pass_last_set_time(samu));
 358         unix_to_nt_time(&info3->base.allow_password_change,
 359                         pdb_get_pass_can_change_time(samu));
 360         unix_to_nt_time(&info3->base.force_password_change,
 361                         pdb_get_pass_must_change_time(samu));
 362
 363         tmp = pdb_get_username(samu);
 364         if (tmp) {
 365                 info3->base.account_name.string = talloc_strdup(info3, tmp);
 366                 RET_NOMEM(info3->base.account_name.string);
 367         }
 368         tmp = pdb_get_fullname(samu);
 369         if (tmp) {
 370                 info3->base.full_name.string = talloc_strdup(info3, tmp);
 371                 RET_NOMEM(info3->base.full_name.string);
 372         }
 373         tmp = pdb_get_logon_script(samu);
 374         if (tmp) {
 375                 info3->base.logon_script.string = talloc_strdup(info3, tmp);
 376                 RET_NOMEM(info3->base.logon_script.string);
 377         }
 378         tmp = pdb_get_profile_path(samu);
 379         if (tmp) {
 380                 info3->base.profile_path.string = talloc_strdup(info3, tmp);
 381                 RET_NOMEM(info3->base.profile_path.string);
 382         }
 383         tmp = pdb_get_homedir(samu);
 384         if (tmp) {
 385                 info3->base.home_directory.string = talloc_strdup(info3, tmp);
 386                 RET_NOMEM(info3->base.home_directory.string);
 387         }
 388         tmp = pdb_get_dir_drive(samu);
 389         if (tmp) {
 390                 info3->base.home_drive.string = talloc_strdup(info3, tmp);
 391                 RET_NOMEM(info3->base.home_drive.string);
 392         }
 393
 394         info3->base.logon_count = pdb_get_logon_count(samu);
 395         info3->base.bad_password_count = pdb_get_bad_password_count(samu);
 396
 397         info3->base.logon_domain.string = talloc_strdup(info3,
 398                                                   pdb_get_domain(samu));
 399         RET_NOMEM(info3->base.logon_domain.string);
 400
 401         info3->base.domain_sid = dom_sid_dup(info3, &domain_sid);
 402         RET_NOMEM(info3->base.domain_sid);
 403
 404         status = pdb_enum_group_memberships(mem_ctx, samu,
 405                                             &group_sids, &gids,
 406                                             &num_group_sids);
 407         if (!NT_STATUS_IS_OK(status)) {
 408                 DEBUG(1, ("Failed to get groups from sam account.\n"));
 409                 TALLOC_FREE(info3);
 410                 return status;
 411         }
 412
 413         if (num_group_sids) {
 414                 status = group_sids_to_info3(info3, group_sids, num_group_sids);
 415                 if (!NT_STATUS_IS_OK(status)) {
 416                         TALLOC_FREE(info3);
 417                         return status;
 418                 }
 419         }
 420
 421         /* We don't need sids and gids after the conversion */
 422         TALLOC_FREE(group_sids);
 423         TALLOC_FREE(gids);
 424         num_group_sids = 0;
 425
 426         /* FIXME: should we add other flags ? */
 427         info3->base.user_flags = NETLOGON_EXTRA_SIDS;
 428
 429         if (login_server) {
 430                 info3->base.logon_server.string = talloc_strdup(info3, login_server);
 431                 RET_NOMEM(info3->base.logon_server.string);
 432         }
 433
 434         info3->base.acct_flags = pdb_get_acct_ctrl(samu);
 435
 436         *_info3 = info3;
 437         return NT_STATUS_OK;
 438 }
 439
 440 NTSTATUS passwd_to_SamInfo3(TALLOC_CTX *mem_ctx,
 441                             const char *unix_username,
 442                             const struct passwd *pwd,
 443                             struct netr_SamInfo3 **pinfo3)
 444 {
 445         struct netr_SamInfo3 *info3;
 446         NTSTATUS status;
 447         TALLOC_CTX *tmp_ctx;
 448         const char *domain_name = NULL;
 449         const char *user_name = NULL;
 450         struct dom_sid domain_sid;
 451         struct dom_sid user_sid;
 452         struct dom_sid group_sid;
 453         enum lsa_SidType type;
 454         uint32_t num_sids = 0;
 455         struct dom_sid *user_sids = NULL;
 456         bool is_null;
 457         bool ok;
 458
 459         tmp_ctx = talloc_stackframe();
 460
 461         ok = lookup_name_smbconf(tmp_ctx,
 462                                  unix_username,
 463                                  LOOKUP_NAME_ALL,
 464                                  &domain_name,
 465                                  &user_name,
 466                                  &user_sid,
 467                                  &type);
 468         if (!ok) {
 469                 status = NT_STATUS_NO_SUCH_USER;
 470                 goto done;
 471         }
 472
 473         if (type != SID_NAME_USER) {
 474                 status = NT_STATUS_NO_SUCH_USER;
 475                 goto done;
 476         }
 477
 478         ok = winbind_lookup_usersids(tmp_ctx,
 479                                      &user_sid,
 480                                      &num_sids,
 481                                      &user_sids);
 482         /* Check if winbind is running */
 483         if (ok) {
 484                 /*
 485                  * Winbind is running and the first element of the user_sids
 486                  * is the primary group.
 487                  */
 488                 if (num_sids > 0) {
 489                         group_sid = user_sids[0];
 490                 }
 491         } else {
 492                 /*
 493                  * Winbind is not running, try to create the group_sid from the
 494                  * passwd group id.
 495                  */
 496
 497                 /*
 498                  * This can lead to a primary group of S-1-22-2-XX which
 499                  * will be rejected by other Samba code.
 500                  */
 501                 gid_to_sid(&group_sid, pwd->pw_gid);
 502
 503                 ZERO_STRUCT(domain_sid);
 504
 505                 /*
 506                  * If we are a unix group, set the group_sid to the
 507                  * 'Domain Users' RID of 513 which will always resolve to a
 508                  * name.
 509                  */
 510                 if (sid_check_is_in_unix_groups(&group_sid)) {
 511                         sid_compose(&group_sid,
 512                                     get_global_sam_sid(),
 513                                     DOMAIN_RID_USERS);
 514                 }
 515         }
 516
 517         /* Make sure we have a valid group sid */
 518         is_null = is_null_sid(&group_sid);
 519         if (is_null) {
 520                 status = NT_STATUS_NO_SUCH_USER;
 521                 goto done;
 522         }
 523
 524         /* Construct a netr_SamInfo3 from the information we have */
 525         info3 = talloc_zero(tmp_ctx, struct netr_SamInfo3);
 526         if (!info3) {
 527                 status = NT_STATUS_NO_MEMORY;
 528                 goto done;
 529         }
 530
 531         info3->base.account_name.string = talloc_strdup(info3, unix_username);
 532         if (info3->base.account_name.string == NULL) {
 533                 status = NT_STATUS_NO_MEMORY;
 534                 goto done;
 535         }
 536
 537         ZERO_STRUCT(domain_sid);
 538
 539         sid_copy(&domain_sid, &user_sid);
 540         sid_split_rid(&domain_sid, &info3->base.rid);
 541         info3->base.domain_sid = dom_sid_dup(info3, &domain_sid);
 542
 543         ok = sid_peek_check_rid(&domain_sid, &group_sid,
 544                                 &info3->base.primary_gid);
 545         if (!ok) {
 546                 DEBUG(1, ("The primary group domain sid(%s) does not "
 547                           "match the domain sid(%s) for %s(%s)\n",
 548                           sid_string_dbg(&group_sid),
 549                           sid_string_dbg(&domain_sid),
 550                           unix_username,
 551                           sid_string_dbg(&user_sid)));
 552                 status = NT_STATUS_INVALID_SID;
 553                 goto done;
 554         }
 555
 556         info3->base.acct_flags = ACB_NORMAL;
 557
 558         if (num_sids) {
 559                 status = group_sids_to_info3(info3, user_sids, num_sids);
 560                 if (!NT_STATUS_IS_OK(status)) {
 561                         goto done;
 562                 }
 563         }
 564
 565         *pinfo3 = talloc_steal(mem_ctx, info3);
 566
 567         status = NT_STATUS_OK;
 568 done:
 569         talloc_free(tmp_ctx);
 570
 571         return status;
 572 }
 573
 574 #undef RET_NOMEM
 575
 576 #define RET_NOMEM(ptr) do { \
 577         if (!ptr) { \
 578                 TALLOC_FREE(info3); \
 579                 return NULL; \
 580         } } while(0)
 581
 582 struct netr_SamInfo3 *copy_netr_SamInfo3(TALLOC_CTX *mem_ctx,
 583                                          struct netr_SamInfo3 *orig)
 584 {
 585         struct netr_SamInfo3 *info3;
 586         unsigned int i;
 587         NTSTATUS status;
 588
 589         info3 = talloc_zero(mem_ctx, struct netr_SamInfo3);
 590         if (!info3) return NULL;
 591
 592         status = copy_netr_SamBaseInfo(info3, &orig->base, &info3->base);
 593         if (!NT_STATUS_IS_OK(status)) {
 594                 TALLOC_FREE(info3);
 595                 return NULL;
 596         }
 597
 598         if (orig->sidcount) {
 599                 info3->sidcount = orig->sidcount;
 600                 info3->sids = talloc_array(info3, struct netr_SidAttr,
 601                                            orig->sidcount);
 602                 RET_NOMEM(info3->sids);
 603                 for (i = 0; i < orig->sidcount; i++) {
 604                         info3->sids[i].sid = dom_sid_dup(info3->sids,
 605                                                             orig->sids[i].sid);
 606                         RET_NOMEM(info3->sids[i].sid);
 607                         info3->sids[i].attributes =
 608                                 orig->sids[i].attributes;
 609                 }
 610         }
 611
 612         return info3;
 613 }
 614