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 <ldb.h>
  26 #include "util/util_ldb.h"
  27 #include "dsdb/samdb/samdb.h"
  28 #include "libcli/security/security.h"
  29 #include "libcli/ldap/ldap.h"
  30 #include "librpc/gen_ndr/ndr_netlogon.h"
  31 #include "param/param.h"
  32
  33 const char *user_attrs[] = {
  34         /* required for the krb5 kdc */
  35         "objectClass",
  36         "sAMAccountName",
  37         "userPrincipalName",
  38         "servicePrincipalName",
  39         "msDS-KeyVersionNumber",
  40         "supplementalCredentials",
  41
  42         /* passwords */
  43         "dBCSPwd",
  44         "unicodePwd",
  45
  46         "userAccountControl",
  47
  48         "pwdLastSet",
  49         "accountExpires",
  50         "logonHours",
  51         "objectSid",
  52
  53         /* check 'allowed workstations' */
  54         "userWorkstations",
  55
  56         /* required for server_info, not access control: */
  57         "displayName",
  58         "scriptPath",
  59         "profilePath",
  60         "homeDirectory",
  61         "homeDrive",
  62         "lastLogon",
  63         "lastLogoff",
  64         "accountExpires",
  65         "badPwdCount",
  66         "logonCount",
  67         "primaryGroupID",
  68         NULL,
  69 };
  70
  71 const char *domain_ref_attrs[] =  {"nETBIOSName", "nCName",
  72                                    "dnsRoot", "objectClass", NULL};
  73
  74 /****************************************************************************
  75  Check if a user is allowed to logon at this time. Note this is the
  76  servers local time, as logon hours are just specified as a weekly
  77  bitmask.
  78 ****************************************************************************/
  79
  80 static bool logon_hours_ok(struct ldb_message *msg, const char *name_for_logs)
  81 {
  82         /* In logon hours first bit is Sunday from 12AM to 1AM */
  83         const struct ldb_val *hours;
  84         struct tm *utctime;
  85         time_t lasttime;
  86         const char *asct;
  87         uint8_t bitmask, bitpos;
  88
  89         hours = ldb_msg_find_ldb_val(msg, "logonHours");
  90         if (!hours) {
  91                 DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs));
  92                 return true;
  93         }
  94
  95         if (hours->length != 168/8) {
  96                 DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs));
  97                 return true;
  98         }
  99
 100         lasttime = time(NULL);
 101         utctime = gmtime(&lasttime);
 102         if (!utctime) {
 103                 DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n",
 104                         name_for_logs));
 105                 return false;
 106         }
 107
 108         /* find the corresponding byte and bit */
 109         bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168;
 110         bitmask = 1 << (bitpos % 8);
 111
 112         if (! (hours->data[bitpos/8] & bitmask)) {
 113                 struct tm *t = localtime(&lasttime);
 114                 if (!t) {
 115                         asct = "INVALID TIME";
 116                 } else {
 117                         asct = asctime(t);
 118                         if (!asct) {
 119                                 asct = "INVALID TIME";
 120                         }
 121                 }
 122
 123                 DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to "
 124                           "logon at this time (%s).\n",
 125                           name_for_logs, asct ));
 126                 return false;
 127         }
 128
 129         asct = asctime(utctime);
 130         DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n",
 131                 name_for_logs, asct ? asct : "UNKNOWN TIME" ));
 132
 133         return true;
 134 }
 135
 136 /****************************************************************************
 137  Do a specific test for a SAM_ACCOUNT being vaild for this connection
 138  (ie not disabled, expired and the like).
 139 ****************************************************************************/
 140 _PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
 141                             struct ldb_context *sam_ctx,
 142                             uint32_t logon_parameters,
 143                             struct ldb_message *msg,
 144                             struct ldb_message *msg_domain_ref,
 145                             const char *logon_workstation,
 146                             const char *name_for_logs)
 147 {
 148         uint16_t acct_flags;
 149         const char *workstation_list;
 150         NTTIME acct_expiry;
 151         NTTIME must_change_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(sam_ctx, mem_ctx, msg, domain_dn);
 159
 160         acct_expiry = samdb_result_account_expires(msg, 0);
 161
 162         /* Check for when we must change this password, taking the
 163          * userAccountControl flags into account */
 164         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 165                                                               domain_dn, msg);
 166
 167         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 168
 169         /* Quit if the account was disabled. */
 170         if (acct_flags & ACB_DISABLED) {
 171                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 172                 return NT_STATUS_ACCOUNT_DISABLED;
 173         }
 174
 175         /* Quit if the account was locked out. */
 176         if (acct_flags & ACB_AUTOLOCK) {
 177                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 178                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 179         }
 180
 181         /* Test account expire time */
 182         unix_to_nt_time(&now, time(NULL));
 183         if (now > acct_expiry) {
 184                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 185                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 186                          nt_time_string(mem_ctx, acct_expiry)));
 187                 return NT_STATUS_ACCOUNT_EXPIRED;
 188         }
 189
 190         /* check for immediate expiry "must change at next logon" */
 191         if (must_change_time == 0) {
 192                 DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 193                          name_for_logs));
 194                 return NT_STATUS_PASSWORD_MUST_CHANGE;
 195         }
 196
 197         /* check for expired password */
 198         if (must_change_time < now) {
 199                 DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 200                          name_for_logs));
 201                 DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 202                          nt_time_string(mem_ctx, must_change_time)));
 203                 return NT_STATUS_PASSWORD_EXPIRED;
 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                                            const char *netbios_name,
 256                                            struct ldb_message *msg,
 257                                            struct ldb_message *msg_domain_ref,
 258                                            DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 259                                            struct auth_serversupplied_info **_server_info)
 260 {
 261         struct auth_serversupplied_info *server_info;
 262         struct ldb_message **group_msgs;
 263         int group_ret;
 264         const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 265         /* find list of sids */
 266         struct dom_sid **groupSIDs = NULL;
 267         struct dom_sid *account_sid;
 268         struct dom_sid *primary_group_sid;
 269         struct ldb_dn *domain_dn;
 270         const char *str;
 271         struct ldb_dn *ncname;
 272         int i;
 273         uint_t rid;
 274         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 275
 276         group_ret = gendb_search(sam_ctx,
 277                                  tmp_ctx, NULL, &group_msgs, group_attrs,
 278                                  "(&(member=%s)(sAMAccountType=*))",
 279                                  ldb_dn_get_linearized(msg->dn));
 280         if (group_ret == -1) {
 281                 talloc_free(tmp_ctx);
 282                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 283         }
 284
 285         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 286         NT_STATUS_HAVE_NO_MEMORY(server_info);
 287
 288         if (group_ret > 0) {
 289                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 290                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 291         }
 292
 293         /* Need to unroll some nested groups, but not aliases */
 294         for (i = 0; i < group_ret; i++) {
 295                 groupSIDs[i] = samdb_result_dom_sid(groupSIDs,
 296                                                     group_msgs[i], "objectSid");
 297                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 298         }
 299
 300         talloc_free(tmp_ctx);
 301
 302         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 303         NT_STATUS_HAVE_NO_MEMORY(account_sid);
 304
 305         primary_group_sid = dom_sid_dup(server_info, account_sid);
 306         NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 307
 308         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 309         if (rid == ~0) {
 310                 if (group_ret > 0) {
 311                         primary_group_sid = groupSIDs[0];
 312                 } else {
 313                         primary_group_sid = NULL;
 314                 }
 315         } else {
 316                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 317         }
 318
 319         server_info->account_sid = account_sid;
 320         server_info->primary_group_sid = primary_group_sid;
 321
 322         server_info->n_domain_groups = group_ret;
 323         server_info->domain_groups = groupSIDs;
 324
 325         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 326
 327         server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 328
 329         str = samdb_result_string(msg, "displayName", "");
 330         server_info->full_name = talloc_strdup(server_info, str);
 331         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 332
 333         str = samdb_result_string(msg, "scriptPath", "");
 334         server_info->logon_script = talloc_strdup(server_info, str);
 335         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 336
 337         str = samdb_result_string(msg, "profilePath", "");
 338         server_info->profile_path = talloc_strdup(server_info, str);
 339         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 340
 341         str = samdb_result_string(msg, "homeDirectory", "");
 342         server_info->home_directory = talloc_strdup(server_info, str);
 343         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 344
 345         str = samdb_result_string(msg, "homeDrive", "");
 346         server_info->home_drive = talloc_strdup(server_info, str);
 347         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 348
 349         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 350         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 351
 352         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 353         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 354         server_info->acct_expiry = samdb_result_account_expires(msg, 0);
 355         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 356
 357         ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 358         if (!ncname) {
 359                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 360         }
 361         server_info->allow_password_change
 362                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 363                                                      ncname, msg, "pwdLastSet");
 364         server_info->force_password_change
 365                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 366                                                      ncname, msg);
 367
 368         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 369         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 370
 371         domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 372
 373         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 374                                                           msg, domain_dn);
 375
 376         server_info->user_session_key = user_sess_key;
 377         server_info->lm_session_key = lm_sess_key;
 378
 379         server_info->authenticated = true;
 380
 381         *_server_info = server_info;
 382
 383         return NT_STATUS_OK;
 384 }
 385
 386 _PUBLIC_ NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 387                                    TALLOC_CTX *mem_ctx, const char *principal,
 388                                    struct ldb_message ***msgs,
 389                                    struct ldb_message ***msgs_domain_ref)
 390 {
 391         struct ldb_dn *user_dn, *domain_dn;
 392         NTSTATUS nt_status;
 393         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 394         int ret;
 395         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 396
 397         if (!tmp_ctx) {
 398                 return NT_STATUS_NO_MEMORY;
 399         }
 400
 401         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 402         if (!NT_STATUS_IS_OK(nt_status)) {
 403                 talloc_free(tmp_ctx);
 404                 return nt_status;
 405         }
 406
 407         /* grab domain info from the reference */
 408         ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 409                            "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 410
 411         if (ret != 1) {
 412                 talloc_free(tmp_ctx);
 413                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 414         }
 415
 416         /* pull the user attributes */
 417         ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 418         if (ret != 1) {
 419                 talloc_free(tmp_ctx);
 420                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 421         }
 422         talloc_steal(mem_ctx, *msgs);
 423         talloc_steal(mem_ctx, *msgs_domain_ref);
 424         talloc_free(tmp_ctx);
 425
 426         return NT_STATUS_OK;
 427 }
 428
 429 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 430 NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx,
 431                                        struct loadparm_context *lp_ctx,
 432                                        const char *principal,
 433                                        struct auth_serversupplied_info **server_info)
 434 {
 435         NTSTATUS nt_status;
 436         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 437         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 438
 439         struct ldb_message **msgs;
 440         struct ldb_message **msgs_domain_ref;
 441         struct ldb_context *sam_ctx;
 442
 443         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 444         if (!tmp_ctx) {
 445                 return NT_STATUS_NO_MEMORY;
 446         }
 447
 448         sam_ctx = samdb_connect(tmp_ctx, lp_ctx, system_session(tmp_ctx, lp_ctx));
 449         if (sam_ctx == NULL) {
 450                 talloc_free(tmp_ctx);
 451                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 452         }
 453
 454         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 455                                               &msgs, &msgs_domain_ref);
 456         if (!NT_STATUS_IS_OK(nt_status)) {
 457                 return nt_status;
 458         }
 459
 460         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, lp_netbios_name(lp_ctx),
 461                                              msgs[0], msgs_domain_ref[0],
 462                                              user_sess_key, lm_sess_key,
 463                                              server_info);
 464         if (NT_STATUS_IS_OK(nt_status)) {
 465                 talloc_steal(mem_ctx, *server_info);
 466         }
 467         talloc_free(tmp_ctx);
 468         return nt_status;
 469 }