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