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