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
   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 #include "param/param.h"
  31
  32 const char *user_attrs[] = {
  33         /* required for the krb5 kdc */
  34         "objectClass",
  35         "sAMAccountName",
  36         "userPrincipalName",
  37         "servicePrincipalName",
  38         "msDS-KeyVersionNumber",
  39         "supplementalCredentials",
  40
  41         /* passwords */
  42         "dBCSPwd",
  43         "unicodePwd",
  44
  45         "userAccountControl",
  46
  47         "pwdLastSet",
  48         "accountExpires",
  49         "logonHours",
  50         "objectSid",
  51
  52         /* check 'allowed workstations' */
  53         "userWorkstations",
  54
  55         /* required for server_info, not access control: */
  56         "displayName",
  57         "scriptPath",
  58         "profilePath",
  59         "homeDirectory",
  60         "homeDrive",
  61         "lastLogon",
  62         "lastLogoff",
  63         "accountExpires",
  64         "badPwdCount",
  65         "logonCount",
  66         "primaryGroupID",
  67         NULL,
  68 };
  69
  70 const char *domain_ref_attrs[] =  {"nETBIOSName", "nCName",
  71                                    "dnsRoot", "objectClass", NULL};
  72
  73 /****************************************************************************
  74  Check if a user is allowed to logon at this time. Note this is the
  75  servers local time, as logon hours are just specified as a weekly
  76  bitmask.
  77 ****************************************************************************/
  78
  79 static BOOL logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
  80 {
  81         /* In logon hours first bit is Sunday from 12AM to 1AM */
  82         const struct ldb_val *hours;
  83         struct tm *utctime;
  84         time_t lasttime;
  85         const char *asct;
  86         uint8_t bitmask, bitpos;
  87
  88         hours = ldb_msg_find_ldb_val(msg, "logonHours");
  89         if (!hours) {
  90                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
  91                 return True;
  92         }
  93
  94         if (hours->length != 168/8) {
  95                 DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
  96                 return True;
  97         }
  98
  99         lasttime = time(NULL);
 100         utctime = gmtime(&lasttime);
 101         if (!utctime) {
 102                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 103                         name_for_logs));
 104                 return False;
 105         }
 106
 107         /* find the corresponding byte and bit */
 108         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 109         bitmask = 1 << (bitpos % 8);
 110
 111         if (! (hours->data[bitpos/8] & bitmask)) {
 112                 struct tm *t = localtime(&lasttime);
 113                 if (!t) {
 114                         asct = "INVALID TIME";
 115                 } else {
 116                         asct = asctime(t);
 117                         if (!asct) {
 118                                 asct = "INVALID TIME";
 119                         }
 120                 }
 121
 122                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 123                           "logon at this time (%s).\n",
 124                           name_for_logs, asct ));
 125                 return False;
 126         }
 127
 128         asct = asctime(utctime);
 129         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 130                 name_for_logs, asct ? asct : "UNKNOWN TIME" ));
 131
 132         return True;
 133 }
 134
 135 /****************************************************************************
 136  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 137  (ie not disabled, expired and the like).
 138 ****************************************************************************/
 139 _PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
 140                             struct ldb_context *sam_ctx,
 141                             uint32_t logon_parameters,
 142                             struct ldb_message *msg,
 143                             struct ldb_message *msg_domain_ref,
 144                             const char *logon_workstation,
 145                             const char *name_for_logs)
 146 {
 147         uint16_t acct_flags;
 148         const char *workstation_list;
 149         NTTIME acct_expiry;
 150         NTTIME must_change_time;
 151         NTTIME last_set_time;
 152
 153         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL));
 154
 155         NTTIME now;
 156         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 157
 158         acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
 159
 160         acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 161         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 162                                                               domain_dn, msg);
 163         last_set_time = samdb_result_nttime(msg, "pwdLastSet", 0);
 164
 165         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 166
 167         /* Quit if the account was disabled. */
 168         if (acct_flags & ACB_DISABLED) {
 169                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 170                 return NT_STATUS_ACCOUNT_DISABLED;
 171         }
 172
 173         /* Quit if the account was locked out. */
 174         if (acct_flags & ACB_AUTOLOCK) {
 175                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 176                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 177         }
 178
 179         /* Test account expire time */
 180         unix_to_nt_time(&now, time(NULL));
 181         if (now > acct_expiry) {
 182                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 183                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 184                          nt_time_string(mem_ctx, acct_expiry)));
 185                 return NT_STATUS_ACCOUNT_EXPIRED;
 186         }
 187
 188         if (!(acct_flags & ACB_PWNOEXP)) {
 189                 /* check for immediate expiry "must change at next logon" */
 190                 if (must_change_time == 0 && last_set_time != 0) {
 191                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 192                                  name_for_logs));
 193                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 194                 }
 195
 196                 /* check for expired password */
 197                 if ((must_change_time != 0) && (must_change_time < now)) {
 198                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 199                                  name_for_logs));
 200                         DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 201                                  nt_time_string(mem_ctx, must_change_time)));
 202                         return NT_STATUS_PASSWORD_EXPIRED;
 203                 }
 204         }
 205
 206         /* Test workstation. Workstation list is comma separated. */
 207         if (logon_workstation && workstation_list && *workstation_list) {
 208                 BOOL invalid_ws = True;
 209                 int i;
 210                 const char **workstations = str_list_make(mem_ctx, workstation_list, ",");
 211
 212                 for (i = 0; workstations && workstations[i]; i++) {
 213                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 214                                   workstations[i], logon_workstation));
 215
 216                         if (strequal(workstations[i], logon_workstation)) {
 217                                 invalid_ws = False;
 218                                 break;
 219                         }
 220                 }
 221
 222                 talloc_free(workstations);
 223
 224                 if (invalid_ws) {
 225                         return NT_STATUS_INVALID_WORKSTATION;
 226                 }
 227         }
 228
 229         if (!logon_hours_ok(msg, name_for_logs)) {
 230                 return NT_STATUS_INVALID_LOGON_HOURS;
 231         }
 232
 233         if (acct_flags & ACB_DOMTRUST) {
 234                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 235                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 236         }
 237
 238         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 239                 if (acct_flags & ACB_SVRTRUST) {
 240                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 241                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 242                 }
 243         }
 244         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 245                 if (acct_flags & ACB_WSTRUST) {
 246                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 247                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 248                 }
 249         }
 250
 251         return NT_STATUS_OK;
 252 }
 253
 254 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 255                                   struct ldb_message *msg,
 256                                   struct ldb_message *msg_domain_ref,
 257                                   DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 258                                   struct auth_serversupplied_info **_server_info)
 259 {
 260         struct auth_serversupplied_info *server_info;
 261         struct ldb_message **group_msgs;
 262         int group_ret;
 263         const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 264         /* find list of sids */
 265         struct dom_sid **groupSIDs = NULL;
 266         struct dom_sid *account_sid;
 267         struct dom_sid *primary_group_sid;
 268         const char *str;
 269         struct ldb_dn *ncname;
 270         int i;
 271         uint_t rid;
 272         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 273
 274         group_ret = gendb_search(sam_ctx,
 275                                  tmp_ctx, NULL, &group_msgs, group_attrs,
 276                                  "(&(member=%s)(sAMAccountType=*))",
 277                                  ldb_dn_get_linearized(msg->dn));
 278         if (group_ret == -1) {
 279                 talloc_free(tmp_ctx);
 280                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 281         }
 282
 283         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 284         NT_STATUS_HAVE_NO_MEMORY(server_info);
 285
 286         if (group_ret > 0) {
 287                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 288                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 289         }
 290
 291         /* Need to unroll some nested groups, but not aliases */
 292         for (i = 0; i < group_ret; i++) {
 293                 groupSIDs[i] = samdb_result_dom_sid(groupSIDs,
 294                                                     group_msgs[i], "objectSid");
 295                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 296         }
 297
 298         talloc_free(tmp_ctx);
 299
 300         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 301         NT_STATUS_HAVE_NO_MEMORY(account_sid);
 302
 303         primary_group_sid = dom_sid_dup(server_info, account_sid);
 304         NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 305
 306         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 307         if (rid == ~0) {
 308                 if (group_ret > 0) {
 309                         primary_group_sid = groupSIDs[0];
 310                 } else {
 311                         primary_group_sid = NULL;
 312                 }
 313         } else {
 314                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 315         }
 316
 317         server_info->account_sid = account_sid;
 318         server_info->primary_group_sid = primary_group_sid;
 319
 320         server_info->n_domain_groups = group_ret;
 321         server_info->domain_groups = groupSIDs;
 322
 323         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 324
 325         server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 326
 327         str = samdb_result_string(msg, "displayName", "");
 328         server_info->full_name = talloc_strdup(server_info, str);
 329         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 330
 331         str = samdb_result_string(msg, "scriptPath", "");
 332         server_info->logon_script = talloc_strdup(server_info, str);
 333         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 334
 335         str = samdb_result_string(msg, "profilePath", "");
 336         server_info->profile_path = talloc_strdup(server_info, str);
 337         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 338
 339         str = samdb_result_string(msg, "homeDirectory", "");
 340         server_info->home_directory = talloc_strdup(server_info, str);
 341         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 342
 343         str = samdb_result_string(msg, "homeDrive", "");
 344         server_info->home_drive = talloc_strdup(server_info, str);
 345         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 346
 347         server_info->logon_server = talloc_strdup(server_info, lp_netbios_name(global_loadparm));
 348         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 349
 350         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 351         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 352         server_info->acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 353         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 354
 355         ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 356         if (!ncname) {
 357                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 358         }
 359         server_info->allow_password_change
 360                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 361                                                      ncname, msg, "pwdLastSet");
 362         server_info->force_password_change
 363                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 364                                                      ncname, msg);
 365
 366         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 367         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 368
 369         server_info->acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
 370
 371         server_info->user_session_key = user_sess_key;
 372         server_info->lm_session_key = lm_sess_key;
 373
 374         server_info->authenticated = True;
 375
 376         *_server_info = server_info;
 377
 378         return NT_STATUS_OK;
 379 }
 380
 381 _PUBLIC_ NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 382                                    TALLOC_CTX *mem_ctx, const char *principal,
 383                                    struct ldb_message ***msgs,
 384                                    struct ldb_message ***msgs_domain_ref)
 385 {
 386         struct ldb_dn *user_dn, *domain_dn;
 387         NTSTATUS nt_status;
 388         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 389         int ret;
 390         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 391
 392         if (!tmp_ctx) {
 393                 return NT_STATUS_NO_MEMORY;
 394         }
 395
 396         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 397         if (!NT_STATUS_IS_OK(nt_status)) {
 398                 talloc_free(tmp_ctx);
 399                 return nt_status;
 400         }
 401
 402         /* grab domain info from the reference */
 403         ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 404                            "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 405
 406         if (ret != 1) {
 407                 talloc_free(tmp_ctx);
 408                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 409         }
 410
 411         /* pull the user attributes */
 412         ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 413         if (ret != 1) {
 414                 talloc_free(tmp_ctx);
 415                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 416         }
 417         talloc_steal(mem_ctx, *msgs);
 418         talloc_steal(mem_ctx, *msgs_domain_ref);
 419         talloc_free(tmp_ctx);
 420
 421         return NT_STATUS_OK;
 422 }
 423
 424 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 425 NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx, const char *principal,
 426                                        struct auth_serversupplied_info **server_info)
 427 {
 428         NTSTATUS nt_status;
 429         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 430         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 431
 432         struct ldb_message **msgs;
 433         struct ldb_message **msgs_domain_ref;
 434         struct ldb_context *sam_ctx;
 435
 436         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 437         if (!tmp_ctx) {
 438                 return NT_STATUS_NO_MEMORY;
 439         }
 440
 441         sam_ctx = samdb_connect(tmp_ctx, system_session(tmp_ctx));
 442         if (sam_ctx == NULL) {
 443                 talloc_free(tmp_ctx);
 444                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 445         }
 446
 447         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 448                                               &msgs, &msgs_domain_ref);
 449         if (!NT_STATUS_IS_OK(nt_status)) {
 450                 return nt_status;
 451         }
 452
 453         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], msgs_domain_ref[0],
 454                                              user_sess_key, lm_sess_key,
 455                                              server_info);
 456         if (NT_STATUS_IS_OK(nt_status)) {
 457                 talloc_steal(mem_ctx, *server_info);
 458         }
 459         talloc_free(tmp_ctx);
 460         return nt_status;
 461 }