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, const int num_sids,
 274         const struct dom_sid *sid)
 275 {
 276         int i;
 277
 278         for (i = 0; i < num_sids; i++) {
 279                 if (dom_sid_equal(sids[i], sid))
 280                         return true;
 281         }
 282         return false;
 283 }
 284
 285 /*
 286  * This function generates the transitive closure of a given SID "sid" (it
 287  * basically expands nested groups of a SID).
 288  * If the SID isn't located in the "res_sids" structure yet and the
 289  * "only_childs" flag is negative, we add it to "res_sids".
 290  * Then we've always to consider the "memberOf" attributes. We invoke the
 291  * function recursively on each item of it with the "only_childs" flag set to
 292  * "false".
 293  * The "only_childs" flag is particularly useful if you have a user SID and
 294  * want to include all his groups (referenced with "memberOf") without his SID
 295  * itself.
 296  *
 297  * At the beginning "res_sids" should reference to a NULL pointer.
 298  */
 299 static NTSTATUS authsam_expand_nested_groups(struct ldb_context *sam_ctx,
 300         const struct dom_sid *sid, const bool only_childs,
 301         TALLOC_CTX *res_sids_ctx, struct dom_sid ***res_sids,
 302         unsigned int *num_res_sids)
 303 {
 304         const char * const attrs[] = { "memberOf", NULL };
 305         unsigned int i;
 306         int ret;
 307         bool already_there;
 308         struct ldb_dn *tmp_dn;
 309         struct dom_sid *tmp_sid;
 310         TALLOC_CTX *tmp_ctx;
 311         struct ldb_message **res;
 312         NTSTATUS status;
 313
 314         if (*res_sids == NULL) {
 315                 *num_res_sids = 0;
 316         }
 317
 318         if (sid == NULL) {
 319                 return NT_STATUS_OK;
 320         }
 321
 322         already_there = sids_contains_sid((const struct dom_sid**) *res_sids,
 323                 *num_res_sids, sid);
 324         if (already_there) {
 325                 return NT_STATUS_OK;
 326         }
 327
 328         if (!only_childs) {
 329                 tmp_sid = dom_sid_dup(res_sids_ctx, sid);
 330                 NT_STATUS_HAVE_NO_MEMORY(tmp_sid);
 331                 *res_sids = talloc_realloc(res_sids_ctx, *res_sids,
 332                         struct dom_sid *, *num_res_sids + 1);
 333                 NT_STATUS_HAVE_NO_MEMORY(*res_sids);
 334                 (*res_sids)[*num_res_sids] = tmp_sid;
 335                 ++(*num_res_sids);
 336         }
 337
 338         tmp_ctx = talloc_new(sam_ctx);
 339
 340         ret = gendb_search(sam_ctx, tmp_ctx, NULL, &res, attrs,
 341                 "objectSid=%s", ldap_encode_ndr_dom_sid(tmp_ctx, sid));
 342         if (ret != 1) {
 343                 talloc_free(tmp_ctx);
 344                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 345         }
 346
 347         if (res[0]->num_elements == 0) {
 348                 talloc_free(res);
 349                 talloc_free(tmp_ctx);
 350                 return NT_STATUS_OK;
 351         }
 352
 353         for (i = 0; i < res[0]->elements[0].num_values; i++) {
 354                 tmp_dn = ldb_dn_from_ldb_val(tmp_ctx, sam_ctx,
 355                         &res[0]->elements[0].values[i]);
 356                 tmp_sid = samdb_search_dom_sid(sam_ctx, tmp_ctx, tmp_dn,
 357                         "objectSid", NULL);
 358
 359                 status = authsam_expand_nested_groups(sam_ctx, tmp_sid,
 360                         false, res_sids_ctx, res_sids, num_res_sids);
 361                 if (!NT_STATUS_IS_OK(status)) {
 362                         talloc_free(res);
 363                         talloc_free(tmp_ctx);
 364                         return status;
 365                 }
 366         }
 367
 368         talloc_free(res);
 369         talloc_free(tmp_ctx);
 370
 371         return NT_STATUS_OK;
 372 }
 373
 374 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx,
 375                                            struct ldb_context *sam_ctx,
 376                                            const char *netbios_name,
 377                                            const char *domain_name,
 378                                            struct ldb_dn *domain_dn,
 379                                            struct ldb_message *msg,
 380                                            DATA_BLOB user_sess_key,
 381                                            DATA_BLOB lm_sess_key,
 382                                            struct auth_serversupplied_info
 383                                                    **_server_info)
 384 {
 385         NTSTATUS status;
 386         struct auth_serversupplied_info *server_info;
 387         const char *str;
 388         struct dom_sid *tmp_sid;
 389         /* SIDs for the account and his primary group */
 390         struct dom_sid *account_sid;
 391         struct dom_sid *primary_group_sid;
 392         /* SID structures for the expanded group memberships */
 393         struct dom_sid **groupSIDs = NULL, **groupSIDs_2 = NULL;
 394         unsigned int num_groupSIDs = 0, num_groupSIDs_2 = 0, i;
 395         uint32_t userAccountControl;
 396
 397         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 398         NT_STATUS_HAVE_NO_MEMORY(server_info);
 399
 400         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 401         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid, server_info);
 402
 403         primary_group_sid = dom_sid_add_rid(server_info,
 404                 samdb_domain_sid(sam_ctx),
 405                 samdb_result_uint(msg, "primaryGroupID", ~0));
 406         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_sid, server_info);
 407
 408         /* Expands the primary group */
 409         status = authsam_expand_nested_groups(sam_ctx, primary_group_sid, false,
 410                                               server_info, &groupSIDs, &num_groupSIDs);
 411         if (!NT_STATUS_IS_OK(status)) {
 412                 talloc_free(server_info);
 413                 return status;
 414         }
 415
 416         /* Expands the additional groups */
 417         status = authsam_expand_nested_groups(sam_ctx, account_sid, true,
 418                 server_info, &groupSIDs_2, &num_groupSIDs_2);
 419         if (!NT_STATUS_IS_OK(status)) {
 420                 talloc_free(server_info);
 421                 return status;
 422         }
 423
 424         /* Merge the two expanded structures (groupSIDs, groupSIDs_2) */
 425         for (i = 0; i < num_groupSIDs_2; i++)
 426                 if (!sids_contains_sid((const struct dom_sid **) groupSIDs,
 427                                 num_groupSIDs, groupSIDs_2[i])) {
 428                         tmp_sid = dom_sid_dup(server_info, groupSIDs_2[i]);
 429                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(tmp_sid, server_info);
 430                         groupSIDs = talloc_realloc(server_info, groupSIDs,
 431                                 struct dom_sid *, num_groupSIDs + 1);
 432                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs,
 433                                 server_info);
 434                         groupSIDs[num_groupSIDs] = tmp_sid;
 435                         ++num_groupSIDs;
 436                 }
 437         talloc_free(groupSIDs_2);
 438
 439         server_info->account_sid = account_sid;
 440         server_info->primary_group_sid = primary_group_sid;
 441
 442         /* DCs also get SID_NT_ENTERPRISE_DCS */
 443         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 444         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 445                 groupSIDs = talloc_realloc(server_info, groupSIDs, struct dom_sid *,
 446                                            num_groupSIDs+1);
 447                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, server_info);
 448                 groupSIDs[num_groupSIDs] = dom_sid_parse_talloc(groupSIDs, SID_NT_ENTERPRISE_DCS);
 449                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs[num_groupSIDs], server_info);
 450                 num_groupSIDs++;
 451         }
 452
 453         server_info->domain_groups = groupSIDs;
 454         server_info->n_domain_groups = num_groupSIDs;
 455
 456         server_info->account_name = talloc_steal(server_info,
 457                 samdb_result_string(msg, "sAMAccountName", NULL));
 458
 459         server_info->domain_name = talloc_strdup(server_info, domain_name);
 460         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->domain_name,
 461                 server_info);
 462
 463         str = samdb_result_string(msg, "displayName", "");
 464         server_info->full_name = talloc_strdup(server_info, str);
 465         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->full_name, server_info);
 466
 467         str = samdb_result_string(msg, "scriptPath", "");
 468         server_info->logon_script = talloc_strdup(server_info, str);
 469         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_script,
 470                 server_info);
 471
 472         str = samdb_result_string(msg, "profilePath", "");
 473         server_info->profile_path = talloc_strdup(server_info, str);
 474         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->profile_path,
 475                 server_info);
 476
 477         str = samdb_result_string(msg, "homeDirectory", "");
 478         server_info->home_directory = talloc_strdup(server_info, str);
 479         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_directory,
 480                 server_info);
 481
 482         str = samdb_result_string(msg, "homeDrive", "");
 483         server_info->home_drive = talloc_strdup(server_info, str);
 484         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_drive, server_info);
 485
 486         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 487         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_server,
 488                 server_info);
 489
 490         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 491         server_info->last_logoff = samdb_result_last_logoff(msg);
 492         server_info->acct_expiry = samdb_result_account_expires(msg);
 493         server_info->last_password_change = samdb_result_nttime(msg,
 494                 "pwdLastSet", 0);
 495         server_info->allow_password_change
 496                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 497                         domain_dn, msg, "pwdLastSet");
 498         server_info->force_password_change
 499                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 500                         domain_dn, msg);
 501         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 502         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount",
 503                 0);
 504
 505         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 506                                                           msg, domain_dn);
 507
 508         server_info->user_session_key = data_blob_talloc(server_info,
 509                                                          user_sess_key.data,
 510                                                          user_sess_key.length);
 511         if (user_sess_key.data) {
 512                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->user_session_key.data,
 513                                                   server_info);
 514         }
 515         server_info->lm_session_key = data_blob_talloc(server_info,
 516                                                        lm_sess_key.data,
 517                                                        lm_sess_key.length);
 518         if (lm_sess_key.data) {
 519                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->lm_session_key.data,
 520                                                   server_info);
 521         }
 522
 523         server_info->authenticated = true;
 524
 525         *_server_info = server_info;
 526
 527         return NT_STATUS_OK;
 528 }
 529
 530 NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 531                                    TALLOC_CTX *mem_ctx, const char *principal,
 532                                    const char **attrs,
 533                                    struct ldb_dn **domain_dn,
 534                                    struct ldb_message **msg)
 535 {
 536         struct ldb_dn *user_dn;
 537         NTSTATUS nt_status;
 538         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 539         int ret;
 540
 541         if (!tmp_ctx) {
 542                 return NT_STATUS_NO_MEMORY;
 543         }
 544
 545         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal,
 546                                               &user_dn, domain_dn);
 547         if (!NT_STATUS_IS_OK(nt_status)) {
 548                 talloc_free(tmp_ctx);
 549                 return nt_status;
 550         }
 551
 552         /* pull the user attributes */
 553         ret = dsdb_search_one(sam_ctx, tmp_ctx, msg, user_dn,
 554                               LDB_SCOPE_BASE, attrs, DSDB_SEARCH_SHOW_EXTENDED_DN, "(objectClass=*)");
 555         if (ret != LDB_SUCCESS) {
 556                 talloc_free(tmp_ctx);
 557                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 558         }
 559         talloc_steal(mem_ctx, *msg);
 560         talloc_steal(mem_ctx, *domain_dn);
 561         talloc_free(tmp_ctx);
 562
 563         return NT_STATUS_OK;
 564 }