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 <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         NTTIME last_set_time;
 153
 154         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL));
 155
 156         NTTIME now;
 157         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
 158
 159         acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
 160
 161         acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 162         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 163                                                               domain_dn, msg);
 164         last_set_time = samdb_result_nttime(msg, "pwdLastSet", 0);
 165
 166         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 167
 168         /* Quit if the account was disabled. */
 169         if (acct_flags & ACB_DISABLED) {
 170                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 171                 return NT_STATUS_ACCOUNT_DISABLED;
 172         }
 173
 174         /* Quit if the account was locked out. */
 175         if (acct_flags & ACB_AUTOLOCK) {
 176                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 177                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 178         }
 179
 180         /* Test account expire time */
 181         unix_to_nt_time(&now, time(NULL));
 182         if (now > acct_expiry) {
 183                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 184                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 185                          nt_time_string(mem_ctx, acct_expiry)));
 186                 return NT_STATUS_ACCOUNT_EXPIRED;
 187         }
 188
 189         if (!(acct_flags & ACB_PWNOEXP)) {
 190                 /* check for immediate expiry "must change at next logon" */
 191                 if (must_change_time == 0 && last_set_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 != 0) && (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
 207         /* Test workstation. Workstation list is comma separated. */
 208         if (logon_workstation && workstation_list && *workstation_list) {
 209                 bool invalid_ws = true;
 210                 int i;
 211                 const char **workstations = str_list_make(mem_ctx, workstation_list, ",");
 212
 213                 for (i = 0; workstations && workstations[i]; i++) {
 214                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 215                                   workstations[i], logon_workstation));
 216
 217                         if (strequal(workstations[i], logon_workstation)) {
 218                                 invalid_ws = false;
 219                                 break;
 220                         }
 221                 }
 222
 223                 talloc_free(workstations);
 224
 225                 if (invalid_ws) {
 226                         return NT_STATUS_INVALID_WORKSTATION;
 227                 }
 228         }
 229
 230         if (!logon_hours_ok(msg, name_for_logs)) {
 231                 return NT_STATUS_INVALID_LOGON_HOURS;
 232         }
 233
 234         if (acct_flags & ACB_DOMTRUST) {
 235                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 236                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 237         }
 238
 239         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 240                 if (acct_flags & ACB_SVRTRUST) {
 241                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 242                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 243                 }
 244         }
 245         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 246                 if (acct_flags & ACB_WSTRUST) {
 247                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 248                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 249                 }
 250         }
 251
 252         return NT_STATUS_OK;
 253 }
 254
 255 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 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         const char *str;
 270         struct ldb_dn *ncname;
 271         int i;
 272         uint_t rid;
 273         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 274
 275         group_ret = gendb_search(sam_ctx,
 276                                  tmp_ctx, NULL, &group_msgs, group_attrs,
 277                                  "(&(member=%s)(sAMAccountType=*))",
 278                                  ldb_dn_get_linearized(msg->dn));
 279         if (group_ret == -1) {
 280                 talloc_free(tmp_ctx);
 281                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 282         }
 283
 284         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 285         NT_STATUS_HAVE_NO_MEMORY(server_info);
 286
 287         if (group_ret > 0) {
 288                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 289                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 290         }
 291
 292         /* Need to unroll some nested groups, but not aliases */
 293         for (i = 0; i < group_ret; i++) {
 294                 groupSIDs[i] = samdb_result_dom_sid(groupSIDs,
 295                                                     group_msgs[i], "objectSid");
 296                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 297         }
 298
 299         talloc_free(tmp_ctx);
 300
 301         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 302         NT_STATUS_HAVE_NO_MEMORY(account_sid);
 303
 304         primary_group_sid = dom_sid_dup(server_info, account_sid);
 305         NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 306
 307         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 308         if (rid == ~0) {
 309                 if (group_ret > 0) {
 310                         primary_group_sid = groupSIDs[0];
 311                 } else {
 312                         primary_group_sid = NULL;
 313                 }
 314         } else {
 315                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 316         }
 317
 318         server_info->account_sid = account_sid;
 319         server_info->primary_group_sid = primary_group_sid;
 320
 321         server_info->n_domain_groups = group_ret;
 322         server_info->domain_groups = groupSIDs;
 323
 324         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 325
 326         server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 327
 328         str = samdb_result_string(msg, "displayName", "");
 329         server_info->full_name = talloc_strdup(server_info, str);
 330         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 331
 332         str = samdb_result_string(msg, "scriptPath", "");
 333         server_info->logon_script = talloc_strdup(server_info, str);
 334         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 335
 336         str = samdb_result_string(msg, "profilePath", "");
 337         server_info->profile_path = talloc_strdup(server_info, str);
 338         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 339
 340         str = samdb_result_string(msg, "homeDirectory", "");
 341         server_info->home_directory = talloc_strdup(server_info, str);
 342         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 343
 344         str = samdb_result_string(msg, "homeDrive", "");
 345         server_info->home_drive = talloc_strdup(server_info, str);
 346         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 347
 348         server_info->logon_server = talloc_strdup(server_info, lp_netbios_name(global_loadparm));
 349         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 350
 351         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 352         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 353         server_info->acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 354         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 355
 356         ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 357         if (!ncname) {
 358                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 359         }
 360         server_info->allow_password_change
 361                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 362                                                      ncname, msg, "pwdLastSet");
 363         server_info->force_password_change
 364                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 365                                                      ncname, msg);
 366
 367         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 368         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 369
 370         server_info->acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
 371
 372         server_info->user_session_key = user_sess_key;
 373         server_info->lm_session_key = lm_sess_key;
 374
 375         server_info->authenticated = true;
 376
 377         *_server_info = server_info;
 378
 379         return NT_STATUS_OK;
 380 }
 381
 382 _PUBLIC_ NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 383                                    TALLOC_CTX *mem_ctx, const char *principal,
 384                                    struct ldb_message ***msgs,
 385                                    struct ldb_message ***msgs_domain_ref)
 386 {
 387         struct ldb_dn *user_dn, *domain_dn;
 388         NTSTATUS nt_status;
 389         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 390         int ret;
 391         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 392
 393         if (!tmp_ctx) {
 394                 return NT_STATUS_NO_MEMORY;
 395         }
 396
 397         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 398         if (!NT_STATUS_IS_OK(nt_status)) {
 399                 talloc_free(tmp_ctx);
 400                 return nt_status;
 401         }
 402
 403         /* grab domain info from the reference */
 404         ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 405                            "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 406
 407         if (ret != 1) {
 408                 talloc_free(tmp_ctx);
 409                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 410         }
 411
 412         /* pull the user attributes */
 413         ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 414         if (ret != 1) {
 415                 talloc_free(tmp_ctx);
 416                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 417         }
 418         talloc_steal(mem_ctx, *msgs);
 419         talloc_steal(mem_ctx, *msgs_domain_ref);
 420         talloc_free(tmp_ctx);
 421
 422         return NT_STATUS_OK;
 423 }
 424
 425 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 426 NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx, const char *principal,
 427                                        struct auth_serversupplied_info **server_info)
 428 {
 429         NTSTATUS nt_status;
 430         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 431         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 432
 433         struct ldb_message **msgs;
 434         struct ldb_message **msgs_domain_ref;
 435         struct ldb_context *sam_ctx;
 436
 437         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 438         if (!tmp_ctx) {
 439                 return NT_STATUS_NO_MEMORY;
 440         }
 441
 442         sam_ctx = samdb_connect(tmp_ctx, global_loadparm, system_session(tmp_ctx));
 443         if (sam_ctx == NULL) {
 444                 talloc_free(tmp_ctx);
 445                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 446         }
 447
 448         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 449                                               &msgs, &msgs_domain_ref);
 450         if (!NT_STATUS_IS_OK(nt_status)) {
 451                 return nt_status;
 452         }
 453
 454         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], msgs_domain_ref[0],
 455                                              user_sess_key, lm_sess_key,
 456                                              server_info);
 457         if (NT_STATUS_IS_OK(nt_status)) {
 458                 talloc_steal(mem_ctx, *server_info);
 459         }
 460         talloc_free(tmp_ctx);
 461         return nt_status;
 462 }