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
  37 #define KRBTGT_ATTRS \
  38         /* required for the krb5 kdc */         \
  39         "objectClass",                          \
  40         "sAMAccountName",                       \
  41         "userPrincipalName",                    \
  42         "servicePrincipalName",                 \
  43         "msDS-KeyVersionNumber",                \
  44         "supplementalCredentials",              \
  45                                                 \
  46         /* passwords */                         \
  47         "dBCSPwd",                              \
  48         "unicodePwd",                           \
  49                                                 \
  50         "userAccountControl",                   \
  51         "objectSid",                            \
  52                                                 \
  53         "pwdLastSet",                           \
  54         "accountExpires"
  55
  56 const char *krbtgt_attrs[] = {
  57         KRBTGT_ATTRS
  58 };
  59
  60 const char *server_attrs[] = {
  61         KRBTGT_ATTRS
  62 };
  63
  64 const char *user_attrs[] = {
  65         KRBTGT_ATTRS,
  66
  67         "logonHours",
  68
  69         /* check 'allowed workstations' */
  70         "userWorkstations",
  71
  72         /* required for server_info, not access control: */
  73         "displayName",
  74         "scriptPath",
  75         "profilePath",
  76         "homeDirectory",
  77         "homeDrive",
  78         "lastLogon",
  79         "lastLogoff",
  80         "accountExpires",
  81         "badPwdCount",
  82         "logonCount",
  83         "primaryGroupID",
  84         "memberOf",
  85         NULL,
  86 };
  87
  88 /****************************************************************************
  89  Check if a user is allowed to logon at this time. Note this is the
  90  servers local time, as logon hours are just specified as a weekly
  91  bitmask.
  92 ****************************************************************************/
  93
  94 static bool logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
  95 {
  96         /* In logon hours first bit is Sunday from 12AM to 1AM */
  97         const struct ldb_val *hours;
  98         struct tm *utctime;
  99         time_t lasttime;
 100         const char *asct;
 101         uint8_t bitmask, bitpos;
 102
 103         hours = ldb_msg_find_ldb_val(msg, "logonHours");
 104         if (!hours) {
 105                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
 106                 return true;
 107         }
 108
 109         if (hours->length != 168/8) {
 110                 DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
 111                 return true;
 112         }
 113
 114         lasttime = time(NULL);
 115         utctime = gmtime(&lasttime);
 116         if (!utctime) {
 117                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 118                         name_for_logs));
 119                 return false;
 120         }
 121
 122         /* find the corresponding byte and bit */
 123         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 124         bitmask = 1 << (bitpos % 8);
 125
 126         if (! (hours->data[bitpos/8] & bitmask)) {
 127                 struct tm *t = localtime(&lasttime);
 128                 if (!t) {
 129                         asct = "INVALID TIME";
 130                 } else {
 131                         asct = asctime(t);
 132                         if (!asct) {
 133                                 asct = "INVALID TIME";
 134                         }
 135                 }
 136
 137                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 138                           "logon at this time (%s).\n",
 139                           name_for_logs, asct ));
 140                 return false;
 141         }
 142
 143         asct = asctime(utctime);
 144         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 145                 name_for_logs, asct ? asct : "UNKNOWN TIME" ));
 146
 147         return true;
 148 }
 149
 150 /****************************************************************************
 151  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 152  (ie not disabled, expired and the like).
 153 ****************************************************************************/
 154 _PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
 155                                      struct ldb_context *sam_ctx,
 156                                      uint32_t logon_parameters,
 157                                      struct ldb_dn *domain_dn,
 158                                      struct ldb_message *msg,
 159                                      const char *logon_workstation,
 160                                      const char *name_for_logs,
 161                                      bool allow_domain_trust,
 162                                      bool password_change)
 163 {
 164         uint16_t acct_flags;
 165         const char *workstation_list;
 166         NTTIME acct_expiry;
 167         NTTIME must_change_time;
 168
 169         NTTIME now;
 170         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 171
 172         acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn);
 173
 174         acct_expiry = samdb_result_account_expires(msg);
 175
 176         /* Check for when we must change this password, taking the
 177          * userAccountControl flags into account */
 178         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 179                                                               domain_dn, msg);
 180
 181         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 182
 183         /* Quit if the account was disabled. */
 184         if (acct_flags & ACB_DISABLED) {
 185                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 186                 return NT_STATUS_ACCOUNT_DISABLED;
 187         }
 188
 189         /* Quit if the account was locked out. */
 190         if (acct_flags & ACB_AUTOLOCK) {
 191                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 192                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 193         }
 194
 195         /* Test account expire time */
 196         unix_to_nt_time(&now, time(NULL));
 197         if (now > acct_expiry) {
 198                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 199                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 200                          nt_time_string(mem_ctx, acct_expiry)));
 201                 return NT_STATUS_ACCOUNT_EXPIRED;
 202         }
 203
 204         /* check for immediate expiry "must change at next logon" (but not if this is a password change request) */
 205         if ((must_change_time == 0) && !password_change) {
 206                 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 207                          name_for_logs));
 208                 return NT_STATUS_PASSWORD_MUST_CHANGE;
 209         }
 210
 211         /* check for expired password (but not if this is a password change request) */
 212         if ((must_change_time < now) && !password_change) {
 213                 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 214                          name_for_logs));
 215                 DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 216                          nt_time_string(mem_ctx, must_change_time)));
 217                 return NT_STATUS_PASSWORD_EXPIRED;
 218         }
 219
 220         /* Test workstation. Workstation list is comma separated. */
 221         if (logon_workstation && workstation_list && *workstation_list) {
 222                 bool invalid_ws = true;
 223                 int i;
 224                 const char **workstations = (const char **)str_list_make(mem_ctx, workstation_list, ",");
 225
 226                 for (i = 0; workstations && workstations[i]; i++) {
 227                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 228                                   workstations[i], logon_workstation));
 229
 230                         if (strequal(workstations[i], logon_workstation)) {
 231                                 invalid_ws = false;
 232                                 break;
 233                         }
 234                 }
 235
 236                 talloc_free(workstations);
 237
 238                 if (invalid_ws) {
 239                         return NT_STATUS_INVALID_WORKSTATION;
 240                 }
 241         }
 242
 243         if (!logon_hours_ok(msg, name_for_logs)) {
 244                 return NT_STATUS_INVALID_LOGON_HOURS;
 245         }
 246
 247         if (!allow_domain_trust) {
 248                 if (acct_flags & ACB_DOMTRUST) {
 249                         DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 250                         return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 251                 }
 252         }
 253         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 254                 if (acct_flags & ACB_SVRTRUST) {
 255                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 256                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 257                 }
 258         }
 259         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 260                 /* TODO: this fails with current solaris client. We
 261                    need to work with Gordon to work out why */
 262                 if (acct_flags & ACB_WSTRUST) {
 263                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 264                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 265                 }
 266         }
 267
 268         return NT_STATUS_OK;
 269 }
 270
 271 /* This function tests if a SID structure "sids" contains the SID "sid" */
 272 static bool sids_contains_sid(const struct dom_sid **sids, const int num_sids,
 273         const struct dom_sid *sid)
 274 {
 275         int i;
 276
 277         for (i = 0; i < num_sids; i++) {
 278                 if (dom_sid_equal(sids[i], sid))
 279                         return true;
 280         }
 281         return false;
 282 }
 283
 284 /*
 285  * This function generates the transitive closure of a given SID "sid" (it
 286  * basically expands nested groups of a SID).
 287  * If the SID isn't located in the "res_sids" structure yet and the
 288  * "only_childs" flag is negative, we add it to "res_sids".
 289  * Then we've always to consider the "memberOf" attributes. We invoke the
 290  * function recursively on each item of it with the "only_childs" flag set to
 291  * "false".
 292  * The "only_childs" flag is particularly useful if you have a user SID and
 293  * want to include all his groups (referenced with "memberOf") without his SID
 294  * itself.
 295  *
 296  * At the beginning "res_sids" should reference to a NULL pointer.
 297  */
 298 static NTSTATUS authsam_expand_nested_groups(struct ldb_context *sam_ctx,
 299         const struct dom_sid *sid, const bool only_childs,
 300         TALLOC_CTX *res_sids_ctx, struct dom_sid ***res_sids,
 301         int *num_res_sids)
 302 {
 303         const char * const attrs[] = { "memberOf", NULL };
 304         int i, ret;
 305         bool already_there;
 306         struct ldb_dn *tmp_dn;
 307         struct dom_sid *tmp_sid;
 308         TALLOC_CTX *tmp_ctx;
 309         struct ldb_message **res;
 310         NTSTATUS status;
 311
 312         if (*res_sids == NULL) {
 313                 *num_res_sids = 0;
 314         }
 315
 316         if (sid == NULL) {
 317                 return NT_STATUS_OK;
 318         }
 319
 320         already_there = sids_contains_sid((const struct dom_sid**) *res_sids,
 321                 *num_res_sids, sid);
 322         if (already_there) {
 323                 return NT_STATUS_OK;
 324         }
 325
 326         if (!only_childs) {
 327                 tmp_sid = dom_sid_dup(res_sids_ctx, sid);
 328                 NT_STATUS_HAVE_NO_MEMORY(tmp_sid);
 329                 *res_sids = talloc_realloc(res_sids_ctx, *res_sids,
 330                         struct dom_sid *, *num_res_sids + 1);
 331                 NT_STATUS_HAVE_NO_MEMORY(*res_sids);
 332                 (*res_sids)[*num_res_sids] = tmp_sid;
 333                 ++(*num_res_sids);
 334         }
 335
 336         tmp_ctx = talloc_new(sam_ctx);
 337
 338         ret = gendb_search(sam_ctx, tmp_ctx, NULL, &res, attrs,
 339                 "objectSid=%s", ldap_encode_ndr_dom_sid(tmp_ctx, sid));
 340         if (ret != 1) {
 341                 talloc_free(tmp_ctx);
 342                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 343         }
 344
 345         if (res[0]->num_elements == 0) {
 346                 talloc_free(res);
 347                 talloc_free(tmp_ctx);
 348                 return NT_STATUS_OK;
 349         }
 350
 351         for (i = 0; i < res[0]->elements[0].num_values; i++) {
 352                 tmp_dn = ldb_dn_from_ldb_val(tmp_ctx, sam_ctx,
 353                         &res[0]->elements[0].values[i]);
 354                 tmp_sid = samdb_search_dom_sid(sam_ctx, tmp_ctx, tmp_dn,
 355                         "objectSid", NULL);
 356
 357                 status = authsam_expand_nested_groups(sam_ctx, tmp_sid,
 358                         false, res_sids_ctx, res_sids, num_res_sids);
 359                 if (!NT_STATUS_IS_OK(status)) {
 360                         talloc_free(res);
 361                         talloc_free(tmp_ctx);
 362                         return status;
 363                 }
 364         }
 365
 366         talloc_free(res);
 367         talloc_free(tmp_ctx);
 368
 369         return NT_STATUS_OK;
 370 }
 371
 372 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx,
 373                                            struct ldb_context *sam_ctx,
 374                                            const char *netbios_name,
 375                                            const char *domain_name,
 376                                            struct ldb_dn *domain_dn,
 377                                            struct ldb_message *msg,
 378                                            DATA_BLOB user_sess_key,
 379                                            DATA_BLOB lm_sess_key,
 380                                            struct auth_serversupplied_info
 381                                                    **_server_info)
 382 {
 383         NTSTATUS status;
 384         struct auth_serversupplied_info *server_info;
 385         const char *str;
 386         struct dom_sid *tmp_sid;
 387         /* SIDs for the account and his primary group */
 388         struct dom_sid *account_sid;
 389         struct dom_sid *primary_group_sid;
 390         /* SID structures for the expanded group memberships */
 391         struct dom_sid **groupSIDs = NULL, **groupSIDs_2 = NULL;
 392         int num_groupSIDs = 0, num_groupSIDs_2 = 0, i;
 393         uint32_t userAccountControl;
 394
 395         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 396         NT_STATUS_HAVE_NO_MEMORY(server_info);
 397
 398         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 399         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid, server_info);
 400
 401         primary_group_sid = dom_sid_add_rid(server_info,
 402                 samdb_domain_sid(sam_ctx),
 403                 samdb_result_uint(msg, "primaryGroupID", ~0));
 404         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_sid, server_info);
 405
 406         /* Expands the primary group */
 407         status = authsam_expand_nested_groups(sam_ctx, primary_group_sid, false,
 408                                               server_info, &groupSIDs, &num_groupSIDs);
 409         if (!NT_STATUS_IS_OK(status)) {
 410                 talloc_free(server_info);
 411                 return status;
 412         }
 413
 414         /* Expands the additional groups */
 415         status = authsam_expand_nested_groups(sam_ctx, account_sid, true,
 416                 server_info, &groupSIDs_2, &num_groupSIDs_2);
 417         if (!NT_STATUS_IS_OK(status)) {
 418                 talloc_free(server_info);
 419                 return status;
 420         }
 421
 422         /* Merge the two expanded structures (groupSIDs, groupSIDs_2) */
 423         for (i = 0; i < num_groupSIDs_2; i++)
 424                 if (!sids_contains_sid((const struct dom_sid **) groupSIDs,
 425                                 num_groupSIDs, groupSIDs_2[i])) {
 426                         tmp_sid = dom_sid_dup(server_info, groupSIDs_2[i]);
 427                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(tmp_sid, server_info);
 428                         groupSIDs = talloc_realloc(server_info, groupSIDs,
 429                                 struct dom_sid *, num_groupSIDs + 1);
 430                         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs,
 431                                 server_info);
 432                         groupSIDs[num_groupSIDs] = tmp_sid;
 433                         ++num_groupSIDs;
 434                 }
 435         talloc_free(groupSIDs_2);
 436
 437         server_info->account_sid = account_sid;
 438         server_info->primary_group_sid = primary_group_sid;
 439
 440         /* DCs also get SID_NT_ENTERPRISE_DCS */
 441         userAccountControl = ldb_msg_find_attr_as_uint(msg, "userAccountControl", 0);
 442         if (userAccountControl & UF_SERVER_TRUST_ACCOUNT) {
 443                 groupSIDs = talloc_realloc(server_info, groupSIDs, struct dom_sid *,
 444                                            num_groupSIDs+1);
 445                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, server_info);
 446                 groupSIDs[num_groupSIDs] = dom_sid_parse_talloc(groupSIDs, SID_NT_ENTERPRISE_DCS);
 447                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs[num_groupSIDs], server_info);
 448                 num_groupSIDs++;
 449         }
 450
 451         server_info->domain_groups = groupSIDs;
 452         server_info->n_domain_groups = num_groupSIDs;
 453
 454         server_info->account_name = talloc_steal(server_info,
 455                 samdb_result_string(msg, "sAMAccountName", NULL));
 456
 457         server_info->domain_name = talloc_strdup(server_info, domain_name);
 458         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->domain_name,
 459                 server_info);
 460
 461         str = samdb_result_string(msg, "displayName", "");
 462         server_info->full_name = talloc_strdup(server_info, str);
 463         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->full_name, server_info);
 464
 465         str = samdb_result_string(msg, "scriptPath", "");
 466         server_info->logon_script = talloc_strdup(server_info, str);
 467         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_script,
 468                 server_info);
 469
 470         str = samdb_result_string(msg, "profilePath", "");
 471         server_info->profile_path = talloc_strdup(server_info, str);
 472         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->profile_path,
 473                 server_info);
 474
 475         str = samdb_result_string(msg, "homeDirectory", "");
 476         server_info->home_directory = talloc_strdup(server_info, str);
 477         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_directory,
 478                 server_info);
 479
 480         str = samdb_result_string(msg, "homeDrive", "");
 481         server_info->home_drive = talloc_strdup(server_info, str);
 482         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_drive, server_info);
 483
 484         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 485         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_server,
 486                 server_info);
 487
 488         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 489         server_info->last_logoff = samdb_result_last_logoff(msg);
 490         server_info->acct_expiry = samdb_result_account_expires(msg);
 491         server_info->last_password_change = samdb_result_nttime(msg,
 492                 "pwdLastSet", 0);
 493         server_info->allow_password_change
 494                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 495                         domain_dn, msg, "pwdLastSet");
 496         server_info->force_password_change
 497                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 498                         domain_dn, msg);
 499         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 500         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount",
 501                 0);
 502
 503         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 504                                                           msg, domain_dn);
 505
 506         server_info->user_session_key = data_blob_talloc_reference(server_info,
 507                 &user_sess_key);
 508         server_info->lm_session_key = data_blob_talloc_reference(server_info,
 509                 &lm_sess_key);
 510
 511         server_info->authenticated = true;
 512
 513         *_server_info = server_info;
 514
 515         return NT_STATUS_OK;
 516 }
 517
 518 NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 519                                    TALLOC_CTX *mem_ctx, const char *principal,
 520                                    const char **attrs,
 521                                    struct ldb_dn **domain_dn,
 522                                    struct ldb_message **msg)
 523 {
 524         struct ldb_dn *user_dn;
 525         NTSTATUS nt_status;
 526         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 527         int ret;
 528
 529         if (!tmp_ctx) {
 530                 return NT_STATUS_NO_MEMORY;
 531         }
 532
 533         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal,
 534                                               &user_dn, domain_dn);
 535         if (!NT_STATUS_IS_OK(nt_status)) {
 536                 talloc_free(tmp_ctx);
 537                 return nt_status;
 538         }
 539
 540         /* pull the user attributes */
 541         ret = gendb_search_single_extended_dn(sam_ctx, tmp_ctx, user_dn,
 542                 LDB_SCOPE_BASE, msg, attrs, "(objectClass=*)");
 543         if (ret != LDB_SUCCESS) {
 544                 talloc_free(tmp_ctx);
 545                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 546         }
 547         talloc_steal(mem_ctx, *msg);
 548         talloc_steal(mem_ctx, *domain_dn);
 549         talloc_free(tmp_ctx);
 550
 551         return NT_STATUS_OK;
 552 }