source4/auth/sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004
   5    Copyright (C) Gerald Carter                             2003
   6    Copyright (C) Stefan Metzmacher                         2005
   7    Copyright (C) Matthias Dieter Wallnöfer                 2009
   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 "system/time.h"
  25 #include "auth/auth.h"
  26 #include <ldb.h>
  27 #include "../lib/util/util_ldb.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "libcli/security/security.h"
  30 #include "libcli/ldap/ldap.h"
  31 #include "../libcli/ldap/ldap_ndr.h"
  32 #include "librpc/gen_ndr/ndr_netlogon.h"
  33 #include "librpc/gen_ndr/ndr_security.h"
  34 #include "param/param.h"
  35 #include "auth/auth_sam.h"
  36 #include "dsdb/common/util.h"
  37
  38 #define KRBTGT_ATTRS \
  39         /* required for the krb5 kdc */         \
  40         "objectClass",                          \
  41         "sAMAccountName",                       \
  42         "userPrincipalName",                    \
  43         "servicePrincipalName",                 \
  44         "msDS-KeyVersionNumber",                \
  45         "supplementalCredentials",              \
  46                                                 \
  47         /* passwords */                         \
  48         "dBCSPwd",                              \
  49         "unicodePwd",                           \
  50                                                 \
  51         "userAccountControl",                   \
  52         "objectSid",                            \
  53                                                 \
  54         "pwdLastSet",                           \
  55         "accountExpires"
  56
  57 const char *krbtgt_attrs[] = {
  58         KRBTGT_ATTRS
  59 };
  60
  61 const char *server_attrs[] = {
  62         KRBTGT_ATTRS
  63 };
  64
  65 const char *user_attrs[] = {
  66         KRBTGT_ATTRS,
  67
  68         "logonHours",
  69
  70         /* check 'allowed workstations' */
  71         "userWorkstations",
  72
  73         /* required for server_info, not access control: */
  74         "displayName",
  75         "scriptPath",
  76         "profilePath",
  77         "homeDirectory",
  78         "homeDrive",
  79         "lastLogon",
  80         "lastLogoff",
  81         "accountExpires",
  82         "badPwdCount",
  83         "logonCount",
  84         "primaryGroupID",
  85         "memberOf",
  86         NULL,
  87 };
  88
  89 /****************************************************************************
  90  Check if a user is allowed to logon at this time. Note this is the
  91  servers local time, as logon hours are just specified as a weekly
  92  bitmask.
  93 ****************************************************************************/
  94
  95 static bool logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
  96 {
  97         /* In logon hours first bit is Sunday from 12AM to 1AM */
  98         const struct ldb_val *hours;
  99         struct tm *utctime;
 100         time_t lasttime;
 101         const char *asct;
 102         uint8_t bitmask, bitpos;
 103
 104         hours = ldb_msg_find_ldb_val(msg, "logonHours");
 105         if (!hours) {
 106                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
 107                 return true;
 108         }
 109
 110         if (hours->length != 168/8) {
 111                 DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
 112                 return true;
 113         }
 114
 115         lasttime = time(NULL);
 116         utctime = gmtime(&lasttime);
 117         if (!utctime) {
 118                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 119                         name_for_logs));
 120                 return false;
 121         }
 122
 123         /* find the corresponding byte and bit */
 124         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 125         bitmask = 1 << (bitpos % 8);
 126
 127         if (! (hours->data[bitpos/8] & bitmask)) {
 128                 struct tm *t = localtime(&lasttime);
 129                 if (!t) {
 130                         asct = "INVALID TIME";
 131                 } else {
 132                         asct = asctime(t);
 133                         if (!asct) {
 134                                 asct = "INVALID TIME";
 135                         }
 136                 }
 137
 138                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 139                           "logon at this time (%s).\n",
 140                           name_for_logs, asct ));
 141                 return false;
 142         }
 143
 144         asct = asctime(utctime);
 145         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 146                 name_for_logs, asct ? asct : "UNKNOWN TIME" ));
 147
 148         return true;
 149 }
 150
 151 /****************************************************************************
 152  Do a specific test for a SAM_ACCOUNT being valid for this connection
 153  (ie not disabled, expired and the like).
 154 ****************************************************************************/
 155 _PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
 156                                      struct ldb_context *sam_ctx,
 157                                      uint32_t logon_parameters,
 158                                      struct ldb_dn *domain_dn,
 159                                      struct ldb_message *msg,
 160                                      const char *logon_workstation,
 161                                      const char *name_for_logs,
 162                                      bool allow_domain_trust,
 163                                      bool password_change)
 164 {
 165         uint16_t acct_flags;
 166         const char *workstation_list;
 167         NTTIME acct_expiry;
 168         NTTIME must_change_time;
 169
 170         NTTIME now;
 171         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 172
 173         acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
 174
 175         acct_expiry = samdb_result_account_expires(msg);
 176
 177         /* Check for when we must change this password, taking the
 178          * userAccountControl flags into account */
 179         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 180                                                               domain_dn, msg);
 181
 182         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 183
 184         /* Quit if the account was disabled. */
 185         if (acct_flags & ACB_DISABLED) {
 186                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 187                 return NT_STATUS_ACCOUNT_DISABLED;
 188         }
 189
 190         /* Quit if the account was locked out. */
 191         if (acct_flags & ACB_AUTOLOCK) {
 192                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 193                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 194         }
 195
 196         /* Test account expire time */
 197         unix_to_nt_time(&now, time(NULL));
 198         if (now > acct_expiry) {
 199                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 200                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 201                          nt_time_string(mem_ctx, acct_expiry)));
 202                 return NT_STATUS_ACCOUNT_EXPIRED;
 203         }
 204
 205         /* check for immediate expiry "must change at next logon" (but not if this is a password change request) */
 206         if ((must_change_time == 0) && !password_change) {
 207                 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 208                          name_for_logs));
 209                 return NT_STATUS_PASSWORD_MUST_CHANGE;
 210         }
 211
 212         /* check for expired password (but not if this is a password change request) */
 213         if ((must_change_time < now) && !password_change) {
 214                 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 215                          name_for_logs));
 216                 DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 217                          nt_time_string(mem_ctx, must_change_time)));
 218                 return NT_STATUS_PASSWORD_EXPIRED;
 219         }
 220
 221         /* Test workstation. Workstation list is comma separated. */
 222         if (logon_workstation && workstation_list && *workstation_list) {
 223                 bool invalid_ws = true;
 224                 int i;
 225                 const char **workstations = (const char **)str_list_make(mem_ctx, workstation_list, ",");
 226
 227                 for (i = 0; workstations && workstations[i]; i++) {
 228                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 229                                   workstations[i], logon_workstation));
 230
 231                         if (strequal(workstations[i], logon_workstation)) {
 232                                 invalid_ws = false;
 233                                 break;
 234                         }
 235                 }
 236
 237                 talloc_free(workstations);
 238
 239                 if (invalid_ws) {
 240                         return NT_STATUS_INVALID_WORKSTATION;
 241                 }
 242         }
 243
 244         if (!logon_hours_ok(msg, name_for_logs)) {
 245                 return NT_STATUS_INVALID_LOGON_HOURS;
 246         }
 247
 248         if (!allow_domain_trust) {
 249                 if (acct_flags & ACB_DOMTRUST) {
 250                         DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 251                         return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 252                 }
 253         }
 254         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 255                 if (acct_flags & ACB_SVRTRUST) {
 256                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 257                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 258                 }
 259         }
 260         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 261                 /* TODO: this fails with current solaris client. We
 262                    need to work with Gordon to work out why */
 263                 if (acct_flags & ACB_WSTRUST) {
 264                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 265                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 266                 }
 267         }
 268
 269         return NT_STATUS_OK;
 270 }
 271
 272 /* This function tests if a SID structure "sids" contains the SID "sid" */
 273 static bool sids_contains_sid(const struct dom_sid **sids,
 274                               const unsigned int num_sids,
 275                               const struct dom_sid *sid)
 276 {
 277         unsigned int i;
 278
 279         for (i = 0; i < num_sids; i++) {
 280                 if (dom_sid_equal(sids[i], sid))
 281                         return true;
 282         }
 283         return false;
 284 }
 285
 286
 287 /*
 288  * This function generates the transitive closure of a given SID "sid" (it
 289  * basically expands nested groups of a SID).
 290  * If the SID isn't located in the "res_sids" structure yet and the
 291  * "only_childs" flag is negative, we add it to "res_sids".
 292  * Then we've always to consider the "memberOf" attributes. We invoke the
 293  * function recursively on each item of it with the "only_childs" flag set to
 294  * "false".
 295  * The "only_childs" flag is particularly useful if you have a user SID and
 296  * want to include all his groups (referenced with "memberOf") without his SID
 297  * itself, or considering if that SID matches the filter
 298  *
 299  * At the beginning "res_sids" should reference to a NULL pointer.
 300  */
 301 NTSTATUS authsam_expand_nested_groups(struct ldb_context *sam_ctx,
 302                                       struct ldb_val *dn_val, const bool only_childs, const char *filter,
 303                                       TALLOC_CTX *res_sids_ctx, struct dom_sid ***res_sids,
 304                                       unsigned int *num_res_sids)
 305 {
 306         const char * const attrs[] = { "memberOf", NULL };
 307         unsigned int i;
 308         int ret;
 309         bool already_there;
 310         struct ldb_dn *dn;
 311         struct dom_sid *sid;
 312         TALLOC_CTX *tmp_ctx;
 313         struct ldb_result *res;
 314         NTSTATUS status;
 315         const struct ldb_val *v;
 316         const struct ldb_message_element *el;
 317         enum ndr_err_code ndr_err;
 318
 319         if (*res_sids == NULL) {
 320                 *num_res_sids = 0;
 321         }
 322
 323         tmp_ctx = talloc_new(res_sids_ctx);
 324
 325         sid = talloc(tmp_ctx, struct dom_sid);
 326         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sid, tmp_ctx);
 327
 328         dn = ldb_dn_from_ldb_val(tmp_ctx, sam_ctx, dn_val);
 329         if (dn == NULL) {
 330                 talloc_free(tmp_ctx);
 331                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 332         }
 333         v = ldb_dn_get_extended_component(dn, "SID");
 334
 335         ndr_err = ndr_pull_struct_blob(v, sid, sid,
 336                                        (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 337         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 338                 talloc_free(tmp_ctx);
 339                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 340         }
 341
 342         if (only_childs) {
 343                 ret = dsdb_search(sam_ctx, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, NULL);
 344         } else {
 345                 /* This is an O(n^2) linear search */
 346                 already_there = sids_contains_sid((const struct dom_sid**) *res_sids,
 347                                                   *num_res_sids, sid);
 348                 if (already_there) {
 349                         return NT_STATUS_OK;
 350                 }
 351
 352                 ret = dsdb_search(sam_ctx, tmp_ctx, &res, dn, LDB_SCOPE_BASE, attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "%s", filter);
 353         }
 354
 355         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 356                 talloc_free(tmp_ctx);
 357                 return NT_STATUS_OK;
 358         }
 359
 360         if (ret != LDB_SUCCESS) {
 361                 talloc_free(tmp_ctx);
 362                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 363         }
 364
 365         /* We may get back 0 results, if the SID didn't match the filter - such as it wasn't a domain group, for example */
 366         if (res->count != 1) {
 367                 talloc_free(tmp_ctx);
 368                 return NT_STATUS_OK;
 369         }
 370
 371         /* We only apply this test once we know the SID matches the filter */
 372         if (!only_childs) {
 373                 *res_sids = talloc_realloc(res_sids_ctx, *res_sids,
 374                         struct dom_sid *, *num_res_sids + 1);
 375                 NT_STATUS_HAVE_NO_MEMORY(*res_sids);
 376                 (*res_sids)[*num_res_sids] = talloc_steal(*res_sids, sid);
 377                 ++(*num_res_sids);
 378         }
 379
 380         el = ldb_msg_find_element(res->msgs[0], "memberOf");
 381
 382         for (i = 0; el && i < el->num_values; i++) {
 383                 status = authsam_expand_nested_groups(sam_ctx, &el->values[i],
 384                                                       false, filter, res_sids_ctx, res_sids, num_res_sids);
 385                 if (!NT_STATUS_IS_OK(status)) {
 386                         talloc_free(res);
 387                         talloc_free(tmp_ctx);
 388                         return status;
 389                 }
 390         }
 391
 392         talloc_free(res);
 393         talloc_free(tmp_ctx);
 394
 395         return NT_STATUS_OK;
 396 }
 397
 398 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx,
 399                                            struct ldb_context *sam_ctx,
 400                                            const char *netbios_name,
 401                                            const char *domain_name,
 402                                            struct ldb_dn *domain_dn,
 403                                            struct ldb_message *msg,
 404                                            DATA_BLOB user_sess_key,
 405                                            DATA_BLOB lm_sess_key,
 406                                            struct auth_serversupplied_info **_server_info)
 407 {
 408         NTSTATUS status;
 409         struct auth_serversupplied_info *server_info;
 410         const char *str, *filter;
 411         /* SIDs for the account and his primary group */
 412         struct dom_sid *account_sid;
 413         struct dom_sid *primary_group_sid;
 414         const char *primary_group_string;
 415         const char *primary_group_dn;
 416         DATA_BLOB primary_group_blob;
 417         /* SID structures for the expanded group memberships */
 418         struct dom_sid **groupSIDs = NULL;
 419         unsigned int num_groupSIDs = 0, i;
 420         struct dom_sid *domain_sid;
 421         TALLOC_CTX *tmp_ctx;
 422         struct ldb_message_element *el;
 423
 424         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 425         NT_STATUS_HAVE_NO_MEMORY(server_info);
 426
 427         tmp_ctx = talloc_new(server_info);
 428         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info, server_info);
 429
 430         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 431         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid, server_info);
 432
 433         status = dom_sid_split_rid(tmp_ctx, account_sid, &domain_sid, NULL);
 434         if (!NT_STATUS_IS_OK(status)) {
 435                 talloc_free(server_info);
 436                 return status;
 437         }
 438
 439         primary_group_sid = dom_sid_add_rid(server_info,
 440                                             domain_sid,
 441                                             samdb_result_uint(msg, "primaryGroupID", ~0));
 442         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_sid, server_info);
 443
 444         /* Filter out builtin groups from this token.  We will search
 445          * for builtin groups later, and not include them in the PAC
 446          * on SamLogon validation info */
 447         filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(!(groupType:1.2.840.113556.1.4.803:=%u))(groupType:1.2.840.113556.1.4.803:=%u))", GROUP_TYPE_BUILTIN_LOCAL_GROUP, GROUP_TYPE_SECURITY_ENABLED);
 448         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(filter, server_info);
 449
 450         primary_group_string = dom_sid_string(tmp_ctx, primary_group_sid);
 451         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_string, server_info);
 452
 453         primary_group_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", primary_group_string);
 454         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_dn, server_info);
 455
 456         primary_group_blob = data_blob_string_const(primary_group_dn);
 457
 458         /* Expands the primary group - this function takes in
 459          * memberOf-like values, so we fake one up with the
 460          * <SID=S-...> format of DN and then let it expand
 461          * them, as long as they meet the filter - so only
 462          * domain groups, not builtin groups
 463          *
 464          * The primary group is still treated specially, so we set the
 465          * 'only childs' flag to true
 466          */
 467         status = authsam_expand_nested_groups(sam_ctx, &primary_group_blob, true, filter,
 468                                               server_info, &groupSIDs, &num_groupSIDs);
 469         if (!NT_STATUS_IS_OK(status)) {
 470                 talloc_free(server_info);
 471                 return status;
 472         }
 473
 474         /* Expands the additional groups */
 475         el = ldb_msg_find_element(msg, "memberOf");
 476         for (i = 0; el && i < el->num_values; i++) {
 477                 /* This function takes in memberOf values and expands
 478                  * them, as long as they meet the filter - so only
 479                  * domain groups, not builtin groups */
 480                 status = authsam_expand_nested_groups(sam_ctx, &el->values[i], false, filter,
 481                                                       server_info, &groupSIDs, &num_groupSIDs);
 482                 if (!NT_STATUS_IS_OK(status)) {
 483                         talloc_free(server_info);
 484                         return status;
 485                 }
 486         }
 487
 488         server_info->account_sid = account_sid;
 489         server_info->primary_group_sid = primary_group_sid;
 490
 491         server_info->domain_groups = groupSIDs;
 492         server_info->n_domain_groups = num_groupSIDs;
 493
 494         server_info->account_name = talloc_steal(server_info,
 495                 samdb_result_string(msg, "sAMAccountName", NULL));
 496
 497         server_info->domain_name = talloc_strdup(server_info, domain_name);
 498         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->domain_name,
 499                 server_info);
 500
 501         str = samdb_result_string(msg, "displayName", "");
 502         server_info->full_name = talloc_strdup(server_info, str);
 503         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->full_name, server_info);
 504
 505         str = samdb_result_string(msg, "scriptPath", "");
 506         server_info->logon_script = talloc_strdup(server_info, str);
 507         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_script,
 508                 server_info);
 509
 510         str = samdb_result_string(msg, "profilePath", "");
 511         server_info->profile_path = talloc_strdup(server_info, str);
 512         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->profile_path,
 513                 server_info);
 514
 515         str = samdb_result_string(msg, "homeDirectory", "");
 516         server_info->home_directory = talloc_strdup(server_info, str);
 517         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_directory,
 518                 server_info);
 519
 520         str = samdb_result_string(msg, "homeDrive", "");
 521         server_info->home_drive = talloc_strdup(server_info, str);
 522         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_drive, server_info);
 523
 524         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 525         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_server,
 526                 server_info);
 527
 528         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 529         server_info->last_logoff = samdb_result_last_logoff(msg);
 530         server_info->acct_expiry = samdb_result_account_expires(msg);
 531         server_info->last_password_change = samdb_result_nttime(msg,
 532                 "pwdLastSet", 0);
 533         server_info->allow_password_change
 534                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 535                         domain_dn, msg, "pwdLastSet");
 536         server_info->force_password_change
 537                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 538                         domain_dn, msg);
 539         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 540         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount",
 541                 0);
 542
 543         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 544                                                           msg, domain_dn);
 545
 546         server_info->user_session_key = data_blob_talloc(server_info,
 547                                                          user_sess_key.data,
 548                                                          user_sess_key.length);
 549         if (user_sess_key.data) {
 550                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->user_session_key.data,
 551                                                   server_info);
 552         }
 553         server_info->lm_session_key = data_blob_talloc(server_info,
 554                                                        lm_sess_key.data,
 555                                                        lm_sess_key.length);
 556         if (lm_sess_key.data) {
 557                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->lm_session_key.data,
 558                                                   server_info);
 559         }
 560
 561         server_info->authenticated = true;
 562
 563         talloc_free(tmp_ctx);
 564         *_server_info = server_info;
 565
 566         return NT_STATUS_OK;
 567 }
 568
 569 NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 570                                    TALLOC_CTX *mem_ctx, const char *principal,
 571                                    const char **attrs,
 572                                    struct ldb_dn **domain_dn,
 573                                    struct ldb_message **msg)
 574 {
 575         struct ldb_dn *user_dn;
 576         NTSTATUS nt_status;
 577         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 578         int ret;
 579
 580         if (!tmp_ctx) {
 581                 return NT_STATUS_NO_MEMORY;
 582         }
 583
 584         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal,
 585                                               &user_dn, domain_dn);
 586         if (!NT_STATUS_IS_OK(nt_status)) {
 587                 talloc_free(tmp_ctx);
 588                 return nt_status;
 589         }
 590
 591         /* pull the user attributes */
 592         ret = dsdb_search_one(sam_ctx, tmp_ctx, msg, user_dn,
 593                               LDB_SCOPE_BASE, attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
 594         if (ret != LDB_SUCCESS) {
 595                 talloc_free(tmp_ctx);
 596                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 597         }
 598         talloc_steal(mem_ctx, *msg);
 599         talloc_steal(mem_ctx, *domain_dn);
 600         talloc_free(tmp_ctx);
 601
 602         return NT_STATUS_OK;
 603 }