source/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
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/time.h"
  24 #include "auth/auth.h"
  25 #include "db_wrap.h"
  26 #include "dsdb/samdb/samdb.h"
  27 #include "libcli/security/security.h"
  28 #include "libcli/ldap/ldap.h"
  29 #include "librpc/gen_ndr/ndr_netlogon.h"
  30
  31 const char *user_attrs[] = {
  32         /* required for the krb5 kdc */
  33         "objectClass",
  34         "sAMAccountName",
  35         "userPrincipalName",
  36         "servicePrincipalName",
  37         "msDS-KeyVersionNumber",
  38         "supplementalCredentials",
  39
  40         /* passwords */
  41         "dBCSPwd",
  42         "unicodePwd",
  43
  44         "userAccountControl",
  45
  46         "pwdLastSet",
  47         "accountExpires",
  48         "logonHours",
  49         "objectSid",
  50
  51         /* check 'allowed workstations' */
  52         "userWorkstations",
  53
  54         /* required for server_info, not access control: */
  55         "displayName",
  56         "scriptPath",
  57         "profilePath",
  58         "homeDirectory",
  59         "homeDrive",
  60         "lastLogon",
  61         "lastLogoff",
  62         "accountExpires",
  63         "badPwdCount",
  64         "logonCount",
  65         "primaryGroupID",
  66         NULL,
  67 };
  68
  69 const char *domain_ref_attrs[] =  {"nETBIOSName", "nCName",
  70                                    "dnsRoot", "objectClass", NULL};
  71
  72 /****************************************************************************
  73  Check if a user is allowed to logon at this time. Note this is the
  74  servers local time, as logon hours are just specified as a weekly
  75  bitmask.
  76 ****************************************************************************/
  77
  78 static BOOL logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
  79 {
  80         /* In logon hours first bit is Sunday from 12AM to 1AM */
  81         const struct ldb_val *hours;
  82         struct tm *utctime;
  83         time_t lasttime;
  84         const char *asct;
  85         uint8_t bitmask, bitpos;
  86
  87         hours = ldb_msg_find_ldb_val(msg, "logonHours");
  88         if (!hours) {
  89                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
  90                 return True;
  91         }
  92
  93         if (hours->length != 168/8) {
  94                 DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
  95                 return True;
  96         }
  97
  98         lasttime = time(NULL);
  99         utctime = gmtime(&lasttime);
 100         if (!utctime) {
 101                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 102                         name_for_logs));
 103                 return False;
 104         }
 105
 106         /* find the corresponding byte and bit */
 107         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 108         bitmask = 1 << (bitpos % 8);
 109
 110         if (! (hours->data[bitpos/8] & bitmask)) {
 111                 struct tm *t = localtime(&lasttime);
 112                 if (!t) {
 113                         asct = "INVALID TIME";
 114                 } else {
 115                         asct = asctime(t);
 116                         if (!asct) {
 117                                 asct = "INVALID TIME";
 118                         }
 119                 }
 120
 121                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 122                           "logon at this time (%s).\n",
 123                           name_for_logs, asct ));
 124                 return False;
 125         }
 126
 127         asct = asctime(utctime);
 128         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 129                 name_for_logs, asct ? asct : "UNKNOWN TIME" ));
 130
 131         return True;
 132 }
 133
 134 /****************************************************************************
 135  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 136  (ie not disabled, expired and the like).
 137 ****************************************************************************/
 138 _PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
 139                             struct ldb_context *sam_ctx,
 140                             uint32_t logon_parameters,
 141                             struct ldb_message *msg,
 142                             struct ldb_message *msg_domain_ref,
 143                             const char *logon_workstation,
 144                             const char *name_for_logs)
 145 {
 146         uint16_t acct_flags;
 147         const char *workstation_list;
 148         NTTIME acct_expiry;
 149         NTTIME must_change_time;
 150         NTTIME last_set_time;
 151
 152         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL));
 153
 154         NTTIME now;
 155         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 156
 157         acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
 158
 159         acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 160         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 161                                                               domain_dn, msg);
 162         last_set_time = samdb_result_nttime(msg, "pwdLastSet", 0);
 163
 164         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 165
 166         /* Quit if the account was disabled. */
 167         if (acct_flags & ACB_DISABLED) {
 168                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 169                 return NT_STATUS_ACCOUNT_DISABLED;
 170         }
 171
 172         /* Quit if the account was locked out. */
 173         if (acct_flags & ACB_AUTOLOCK) {
 174                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 175                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 176         }
 177
 178         /* Test account expire time */
 179         unix_to_nt_time(&now, time(NULL));
 180         if (now > acct_expiry) {
 181                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 182                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 183                          nt_time_string(mem_ctx, acct_expiry)));
 184                 return NT_STATUS_ACCOUNT_EXPIRED;
 185         }
 186
 187         if (!(acct_flags & ACB_PWNOEXP)) {
 188                 /* check for immediate expiry "must change at next logon" */
 189                 if (must_change_time == 0 && last_set_time != 0) {
 190                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 191                                  name_for_logs));
 192                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 193                 }
 194
 195                 /* check for expired password */
 196                 if ((must_change_time != 0) && (must_change_time < now)) {
 197                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 198                                  name_for_logs));
 199                         DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 200                                  nt_time_string(mem_ctx, must_change_time)));
 201                         return NT_STATUS_PASSWORD_EXPIRED;
 202                 }
 203         }
 204
 205         /* Test workstation. Workstation list is comma separated. */
 206         if (logon_workstation && workstation_list && *workstation_list) {
 207                 BOOL invalid_ws = True;
 208                 int i;
 209                 const char **workstations = str_list_make(mem_ctx, workstation_list, ",");
 210
 211                 for (i = 0; workstations && workstations[i]; i++) {
 212                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 213                                   workstations[i], logon_workstation));
 214
 215                         if (strequal(workstations[i], logon_workstation)) {
 216                                 invalid_ws = False;
 217                                 break;
 218                         }
 219                 }
 220
 221                 talloc_free(workstations);
 222
 223                 if (invalid_ws) {
 224                         return NT_STATUS_INVALID_WORKSTATION;
 225                 }
 226         }
 227
 228         if (!logon_hours_ok(msg, name_for_logs)) {
 229                 return NT_STATUS_INVALID_LOGON_HOURS;
 230         }
 231
 232         if (acct_flags & ACB_DOMTRUST) {
 233                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 234                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 235         }
 236
 237         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 238                 if (acct_flags & ACB_SVRTRUST) {
 239                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 240                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 241                 }
 242         }
 243         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 244                 if (acct_flags & ACB_WSTRUST) {
 245                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 246                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 247                 }
 248         }
 249
 250         return NT_STATUS_OK;
 251 }
 252
 253 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 254                                   struct ldb_message *msg,
 255                                   struct ldb_message *msg_domain_ref,
 256                                   DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 257                                   struct auth_serversupplied_info **_server_info)
 258 {
 259         struct auth_serversupplied_info *server_info;
 260         struct ldb_message **group_msgs;
 261         int group_ret;
 262         const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 263         /* find list of sids */
 264         struct dom_sid **groupSIDs = NULL;
 265         struct dom_sid *account_sid;
 266         struct dom_sid *primary_group_sid;
 267         const char *str;
 268         struct ldb_dn *ncname;
 269         int i;
 270         uint_t rid;
 271         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 272
 273         group_ret = gendb_search(sam_ctx,
 274                                  tmp_ctx, NULL, &group_msgs, group_attrs,
 275                                  "(&(member=%s)(sAMAccountType=*))",
 276                                  ldb_dn_get_linearized(msg->dn));
 277         if (group_ret == -1) {
 278                 talloc_free(tmp_ctx);
 279                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 280         }
 281
 282         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 283         NT_STATUS_HAVE_NO_MEMORY(server_info);
 284
 285         if (group_ret > 0) {
 286                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 287                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 288         }
 289
 290         /* Need to unroll some nested groups, but not aliases */
 291         for (i = 0; i < group_ret; i++) {
 292                 groupSIDs[i] = samdb_result_dom_sid(groupSIDs,
 293                                                     group_msgs[i], "objectSid");
 294                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 295         }
 296
 297         talloc_free(tmp_ctx);
 298
 299         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 300         NT_STATUS_HAVE_NO_MEMORY(account_sid);
 301
 302         primary_group_sid = dom_sid_dup(server_info, account_sid);
 303         NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 304
 305         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 306         if (rid == ~0) {
 307                 if (group_ret > 0) {
 308                         primary_group_sid = groupSIDs[0];
 309                 } else {
 310                         primary_group_sid = NULL;
 311                 }
 312         } else {
 313                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 314         }
 315
 316         server_info->account_sid = account_sid;
 317         server_info->primary_group_sid = primary_group_sid;
 318
 319         server_info->n_domain_groups = group_ret;
 320         server_info->domain_groups = groupSIDs;
 321
 322         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 323
 324         server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 325
 326         str = samdb_result_string(msg, "displayName", "");
 327         server_info->full_name = talloc_strdup(server_info, str);
 328         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 329
 330         str = samdb_result_string(msg, "scriptPath", "");
 331         server_info->logon_script = talloc_strdup(server_info, str);
 332         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 333
 334         str = samdb_result_string(msg, "profilePath", "");
 335         server_info->profile_path = talloc_strdup(server_info, str);
 336         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 337
 338         str = samdb_result_string(msg, "homeDirectory", "");
 339         server_info->home_directory = talloc_strdup(server_info, str);
 340         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 341
 342         str = samdb_result_string(msg, "homeDrive", "");
 343         server_info->home_drive = talloc_strdup(server_info, str);
 344         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 345
 346         server_info->logon_server = talloc_strdup(server_info, lp_netbios_name());
 347         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 348
 349         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 350         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 351         server_info->acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 352         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 353
 354         ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 355         if (!ncname) {
 356                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 357         }
 358         server_info->allow_password_change
 359                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 360                                                      ncname, msg, "pwdLastSet");
 361         server_info->force_password_change
 362                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 363                                                      ncname, msg);
 364
 365         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 366         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 367
 368         server_info->acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
 369
 370         server_info->user_session_key = user_sess_key;
 371         server_info->lm_session_key = lm_sess_key;
 372
 373         server_info->authenticated = True;
 374
 375         *_server_info = server_info;
 376
 377         return NT_STATUS_OK;
 378 }
 379
 380 _PUBLIC_ NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 381                                    TALLOC_CTX *mem_ctx, const char *principal,
 382                                    struct ldb_message ***msgs,
 383                                    struct ldb_message ***msgs_domain_ref)
 384 {
 385         struct ldb_dn *user_dn, *domain_dn;
 386         NTSTATUS nt_status;
 387         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 388         int ret;
 389         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 390
 391         if (!tmp_ctx) {
 392                 return NT_STATUS_NO_MEMORY;
 393         }
 394
 395         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 396         if (!NT_STATUS_IS_OK(nt_status)) {
 397                 talloc_free(tmp_ctx);
 398                 return nt_status;
 399         }
 400
 401         /* grab domain info from the reference */
 402         ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 403                            "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 404
 405         if (ret != 1) {
 406                 talloc_free(tmp_ctx);
 407                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 408         }
 409
 410         /* pull the user attributes */
 411         ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 412         if (ret != 1) {
 413                 talloc_free(tmp_ctx);
 414                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 415         }
 416         talloc_steal(mem_ctx, *msgs);
 417         talloc_steal(mem_ctx, *msgs_domain_ref);
 418         talloc_free(tmp_ctx);
 419
 420         return NT_STATUS_OK;
 421 }
 422
 423 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 424 NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx, const char *principal,
 425                                        struct auth_serversupplied_info **server_info)
 426 {
 427         NTSTATUS nt_status;
 428         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 429         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 430
 431         struct ldb_message **msgs;
 432         struct ldb_message **msgs_domain_ref;
 433         struct ldb_context *sam_ctx;
 434
 435         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 436         if (!tmp_ctx) {
 437                 return NT_STATUS_NO_MEMORY;
 438         }
 439
 440         sam_ctx = samdb_connect(tmp_ctx, system_session(tmp_ctx));
 441         if (sam_ctx == NULL) {
 442                 talloc_free(tmp_ctx);
 443                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 444         }
 445
 446         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 447                                               &msgs, &msgs_domain_ref);
 448         if (!NT_STATUS_IS_OK(nt_status)) {
 449                 return nt_status;
 450         }
 451
 452         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], msgs_domain_ref[0],
 453                                              user_sess_key, lm_sess_key,
 454                                              server_info);
 455         if (NT_STATUS_IS_OK(nt_status)) {
 456                 talloc_steal(mem_ctx, *server_info);
 457         }
 458         talloc_free(tmp_ctx);
 459         return nt_status;
 460 }