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                 if (acct_flags & ACB_WSTRUST) {
 261                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 262                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 263                 }
 264         }
 265
 266         return NT_STATUS_OK;
 267 }
 268
 269 /* This function tests if a SID structure "sids" contains the SID "sid" */
 270 static bool sids_contains_sid(const struct dom_sid **sids, const int num_sids,
 271         const struct dom_sid *sid)
 272 {
 273         int i;
 274
 275         for (i = 0; i < num_sids; i++) {
 276                 if (dom_sid_equal(sids[i], sid))
 277                         return true;
 278         }
 279         return false;
 280 }
 281
 282 /*
 283  * This function generates the transitive closure of a given SID "sid" (it
 284  * basically expands nested groups of a SID).
 285  * - If a SID is a user or a group we've always to consider the "memberOf"
 286  *   attribute. If the SID isn't located in the "res_sids" structure yet, we've
 287  *   to add it.
 288  * - We also add each object's SID to "red_sids"
 289  *
 290  * In the beginning "res_sids" should reference to a NULL pointer.
 291  */
 292 static NTSTATUS authsam_expand_nested_groups(struct ldb_context *sam_ctx,
 293         const struct dom_sid *sid, TALLOC_CTX *res_sids_ctx,
 294         struct dom_sid ***res_sids, int *num_res_sids)
 295 {
 296         const char * const attrs[] = { "memberOf", NULL };
 297         int i, ret;
 298         bool already_there;
 299         struct ldb_dn *tmp_dn;
 300         struct dom_sid *tmp_sid;
 301         TALLOC_CTX *tmp_ctx;
 302         struct ldb_message **res;
 303         NTSTATUS status;
 304
 305         if (*res_sids == NULL) {
 306                 *num_res_sids = 0;
 307         }
 308
 309         if (sid == NULL) {
 310                 return NT_STATUS_OK;
 311         }
 312
 313         already_there = sids_contains_sid((const struct dom_sid**) *res_sids,
 314                 *num_res_sids, sid);
 315         if (already_there) {
 316                 return NT_STATUS_OK;
 317         }
 318
 319         tmp_sid = dom_sid_dup(res_sids_ctx, sid);
 320         NT_STATUS_HAVE_NO_MEMORY(tmp_sid);
 321         *res_sids = talloc_realloc(res_sids_ctx, *res_sids, struct dom_sid *,
 322                 *num_res_sids + 1);
 323         NT_STATUS_HAVE_NO_MEMORY(*res_sids);
 324         (*res_sids)[*num_res_sids] = tmp_sid;
 325         ++(*num_res_sids);
 326
 327         tmp_ctx = talloc_new(sam_ctx);
 328
 329         ret = gendb_search(sam_ctx, tmp_ctx, NULL, &res, attrs,
 330                 "objectSid=%s", ldap_encode_ndr_dom_sid(tmp_ctx, sid));
 331         if (ret != 1) {
 332                 talloc_free(tmp_ctx);
 333                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 334         }
 335
 336         if (res[0]->num_elements == 0) {
 337                 talloc_free(res);
 338                 talloc_free(tmp_ctx);
 339                 return NT_STATUS_OK;
 340         }
 341
 342         for (i = 0; i < res[0]->elements[0].num_values; i++) {
 343                 tmp_dn = ldb_dn_from_ldb_val(tmp_ctx, sam_ctx,
 344                         &res[0]->elements[0].values[i]);
 345                 tmp_sid = samdb_search_dom_sid(sam_ctx, tmp_ctx, tmp_dn,
 346                         "objectSid", NULL);
 347
 348                 status = authsam_expand_nested_groups(sam_ctx, tmp_sid,
 349                         res_sids_ctx, res_sids, num_res_sids);
 350                 if (!NT_STATUS_IS_OK(status)) {
 351                         talloc_free(res);
 352                         talloc_free(tmp_ctx);
 353                         return status;
 354                 }
 355         }
 356
 357         talloc_free(res);
 358         talloc_free(tmp_ctx);
 359
 360         return NT_STATUS_OK;
 361 }
 362
 363 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx,
 364                                            struct ldb_context *sam_ctx,
 365                                            const char *netbios_name,
 366                                            const char *domain_name,
 367                                            struct ldb_dn *domain_dn,
 368                                            struct ldb_message *msg,
 369                                            DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 370                                            struct auth_serversupplied_info **_server_info)
 371 {
 372         NTSTATUS status;
 373         struct auth_serversupplied_info *server_info;
 374         int group_ret = 0;
 375         /* find list of sids */
 376         struct dom_sid **groupSIDs = NULL;
 377         struct dom_sid *account_sid;
 378         struct dom_sid *primary_group_sid;
 379         const char *str;
 380         uint_t rid;
 381         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 382
 383         server_info = talloc(tmp_ctx, struct auth_serversupplied_info);
 384         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info, tmp_ctx);
 385
 386         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 387         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid, tmp_ctx);
 388
 389         status = authsam_expand_nested_groups(sam_ctx, account_sid, server_info,
 390                 &groupSIDs, &group_ret);
 391         if (!NT_STATUS_IS_OK(status)) {
 392                 talloc_free(tmp_ctx);
 393                 return status;
 394         }
 395
 396         primary_group_sid = dom_sid_dup(server_info, account_sid);
 397         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_sid, tmp_ctx);
 398
 399         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 400         if (rid == ~0) {
 401                 if (group_ret > 0) {
 402                         primary_group_sid = groupSIDs[0];
 403                 } else {
 404                         primary_group_sid = NULL;
 405                 }
 406         } else {
 407                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 408         }
 409
 410         server_info->account_sid = account_sid;
 411         server_info->primary_group_sid = primary_group_sid;
 412
 413         server_info->n_domain_groups = group_ret;
 414         server_info->domain_groups = groupSIDs;
 415
 416         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 417
 418         server_info->domain_name = talloc_strdup(server_info, domain_name);
 419         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->domain_name, tmp_ctx);
 420
 421         str = samdb_result_string(msg, "displayName", "");
 422         server_info->full_name = talloc_strdup(server_info, str);
 423         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->full_name, tmp_ctx);
 424
 425         str = samdb_result_string(msg, "scriptPath", "");
 426         server_info->logon_script = talloc_strdup(server_info, str);
 427         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_script, tmp_ctx);
 428
 429         str = samdb_result_string(msg, "profilePath", "");
 430         server_info->profile_path = talloc_strdup(server_info, str);
 431         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->profile_path, tmp_ctx);
 432
 433         str = samdb_result_string(msg, "homeDirectory", "");
 434         server_info->home_directory = talloc_strdup(server_info, str);
 435         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_directory, tmp_ctx);
 436
 437         str = samdb_result_string(msg, "homeDrive", "");
 438         server_info->home_drive = talloc_strdup(server_info, str);
 439         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_drive, tmp_ctx);
 440
 441         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 442         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_server, tmp_ctx);
 443
 444         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 445         server_info->last_logoff = samdb_result_last_logoff(msg);
 446         server_info->acct_expiry = samdb_result_account_expires(msg);
 447         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 448
 449         server_info->allow_password_change
 450                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 451                                                      domain_dn, msg, "pwdLastSet");
 452         server_info->force_password_change
 453                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 454                                                      domain_dn, msg);
 455
 456         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 457         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 458
 459         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 460                                                           msg, domain_dn);
 461
 462         server_info->user_session_key = user_sess_key;
 463         server_info->lm_session_key = lm_sess_key;
 464
 465         server_info->authenticated = true;
 466
 467         *_server_info = talloc_steal(mem_ctx, server_info);
 468
 469         return NT_STATUS_OK;
 470 }
 471
 472 NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 473                                    TALLOC_CTX *mem_ctx, const char *principal,
 474                                    const char **attrs,
 475                                    struct ldb_dn **domain_dn,
 476                                    struct ldb_message **msg)
 477 {
 478         struct ldb_dn *user_dn;
 479         NTSTATUS nt_status;
 480         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 481         int ret;
 482
 483         if (!tmp_ctx) {
 484                 return NT_STATUS_NO_MEMORY;
 485         }
 486
 487         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal,
 488                                               &user_dn, domain_dn);
 489         if (!NT_STATUS_IS_OK(nt_status)) {
 490                 talloc_free(tmp_ctx);
 491                 return nt_status;
 492         }
 493
 494         /* pull the user attributes */
 495         ret = gendb_search_single_extended_dn(sam_ctx, tmp_ctx, user_dn, LDB_SCOPE_BASE,
 496                                               msg, attrs, "(objectClass=*)");
 497         if (ret != LDB_SUCCESS) {
 498                 talloc_free(tmp_ctx);
 499                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 500         }
 501         talloc_steal(mem_ctx, *msg);
 502         talloc_steal(mem_ctx, *domain_dn);
 503         talloc_free(tmp_ctx);
 504
 505         return NT_STATUS_OK;
 506 }