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 "../lib/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 "librpc/gen_ndr/ndr_security.h"
  32 #include "param/param.h"
  33 #include "auth/auth_sam.h"
  34
  35 const char *user_attrs[] = {
  36         /* required for the krb5 kdc */
  37         "objectClass",
  38         "sAMAccountName",
  39         "userPrincipalName",
  40         "servicePrincipalName",
  41         "msDS-KeyVersionNumber",
  42         "supplementalCredentials",
  43
  44         /* passwords */
  45         "dBCSPwd",
  46         "unicodePwd",
  47
  48         "userAccountControl",
  49
  50         "pwdLastSet",
  51         "accountExpires",
  52         "logonHours",
  53         "objectSid",
  54
  55         /* check 'allowed workstations' */
  56         "userWorkstations",
  57
  58         /* required for server_info, not access control: */
  59         "displayName",
  60         "scriptPath",
  61         "profilePath",
  62         "homeDirectory",
  63         "homeDrive",
  64         "lastLogon",
  65         "lastLogoff",
  66         "accountExpires",
  67         "badPwdCount",
  68         "logonCount",
  69         "primaryGroupID",
  70         "memberOf",
  71         NULL,
  72 };
  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_dn *domain_dn,
 144                                      struct ldb_message *msg,
 145                                      const char *logon_workstation,
 146                                      const char *name_for_logs,
 147                                      bool allow_domain_trust,
 148                                      bool password_change)
 149 {
 150         uint16_t acct_flags;
 151         const char *workstation_list;
 152         NTTIME acct_expiry;
 153         NTTIME must_change_time;
 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);
 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" (but not if this is a password change request) */
 191         if ((must_change_time == 0) && !password_change) {
 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 (but not if this is a password change request) */
 198         if ((must_change_time < now) && !password_change) {
 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 = (const char **)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 (!allow_domain_trust) {
 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                                            const char *netbios_name,
 257                                            const char *domain_name,
 258                                            struct ldb_dn *domain_dn,
 259                                            struct ldb_message *msg,
 260                                            DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 261                                            struct auth_serversupplied_info **_server_info)
 262 {
 263         struct auth_serversupplied_info *server_info;
 264         int group_ret = 0;
 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         int i;
 271         uint_t rid;
 272         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 273         struct ldb_message_element *el;
 274
 275         server_info = talloc(tmp_ctx, struct auth_serversupplied_info);
 276         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info, tmp_ctx);
 277
 278         el = ldb_msg_find_element(msg, "memberOf");
 279         if (el != NULL) {
 280                 group_ret = el->num_values;
 281                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 282                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs, tmp_ctx);
 283         }
 284
 285         /* TODO Note: this is incomplete. We need to unroll some
 286          * nested groups, but not aliases */
 287         for (i = 0; i < group_ret; i++) {
 288                 struct ldb_dn *dn;
 289                 const struct ldb_val *v;
 290                 enum ndr_err_code ndr_err;
 291
 292                 dn = ldb_dn_from_ldb_val(tmp_ctx, sam_ctx, &el->values[i]);
 293                 if (dn == NULL) {
 294                         talloc_free(tmp_ctx);
 295                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 296                 }
 297                 v = ldb_dn_get_extended_component(dn, "SID");
 298                 groupSIDs[i] = talloc(groupSIDs, struct dom_sid);
 299                 NT_STATUS_HAVE_NO_MEMORY_AND_FREE(groupSIDs[i], tmp_ctx);
 300
 301                 ndr_err = ndr_pull_struct_blob(v, groupSIDs[i], NULL, groupSIDs[i],
 302                                                (ndr_pull_flags_fn_t)ndr_pull_dom_sid);
 303                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 304                         talloc_free(tmp_ctx);
 305                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 306                 }
 307         }
 308
 309         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 310         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(account_sid, tmp_ctx);
 311
 312         primary_group_sid = dom_sid_dup(server_info, account_sid);
 313         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(primary_group_sid, tmp_ctx);
 314
 315         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 316         if (rid == ~0) {
 317                 if (group_ret > 0) {
 318                         primary_group_sid = groupSIDs[0];
 319                 } else {
 320                         primary_group_sid = NULL;
 321                 }
 322         } else {
 323                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 324         }
 325
 326         server_info->account_sid = account_sid;
 327         server_info->primary_group_sid = primary_group_sid;
 328
 329         server_info->n_domain_groups = group_ret;
 330         server_info->domain_groups = groupSIDs;
 331
 332         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 333
 334         server_info->domain_name = talloc_strdup(server_info, domain_name);
 335         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->domain_name, tmp_ctx);
 336
 337         str = samdb_result_string(msg, "displayName", "");
 338         server_info->full_name = talloc_strdup(server_info, str);
 339         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->full_name, tmp_ctx);
 340
 341         str = samdb_result_string(msg, "scriptPath", "");
 342         server_info->logon_script = talloc_strdup(server_info, str);
 343         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_script, tmp_ctx);
 344
 345         str = samdb_result_string(msg, "profilePath", "");
 346         server_info->profile_path = talloc_strdup(server_info, str);
 347         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->profile_path, tmp_ctx);
 348
 349         str = samdb_result_string(msg, "homeDirectory", "");
 350         server_info->home_directory = talloc_strdup(server_info, str);
 351         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_directory, tmp_ctx);
 352
 353         str = samdb_result_string(msg, "homeDrive", "");
 354         server_info->home_drive = talloc_strdup(server_info, str);
 355         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->home_drive, tmp_ctx);
 356
 357         server_info->logon_server = talloc_strdup(server_info, netbios_name);
 358         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(server_info->logon_server, tmp_ctx);
 359
 360         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 361         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 362         server_info->acct_expiry = samdb_result_account_expires(msg);
 363         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 364
 365         server_info->allow_password_change
 366                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 367                                                      domain_dn, msg, "pwdLastSet");
 368         server_info->force_password_change
 369                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 370                                                      domain_dn, msg);
 371
 372         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 373         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 374
 375         server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx,
 376                                                           msg, domain_dn);
 377
 378         server_info->user_session_key = user_sess_key;
 379         server_info->lm_session_key = lm_sess_key;
 380
 381         server_info->authenticated = true;
 382
 383         *_server_info = talloc_steal(mem_ctx, server_info);
 384
 385         return NT_STATUS_OK;
 386 }
 387
 388 NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 389                                    TALLOC_CTX *mem_ctx, const char *principal,
 390                                    struct ldb_dn **domain_dn,
 391                                    struct ldb_message **msg)
 392 {
 393         struct ldb_dn *user_dn;
 394         NTSTATUS nt_status;
 395         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 396         int ret;
 397
 398         if (!tmp_ctx) {
 399                 return NT_STATUS_NO_MEMORY;
 400         }
 401
 402         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, domain_dn);
 403         if (!NT_STATUS_IS_OK(nt_status)) {
 404                 talloc_free(tmp_ctx);
 405                 return nt_status;
 406         }
 407
 408         /* pull the user attributes */
 409         ret = gendb_search_single_extended_dn(sam_ctx, tmp_ctx, user_dn, LDB_SCOPE_BASE,
 410                                               msg, user_attrs, "(objectClass=*)");
 411         if (ret != LDB_SUCCESS) {
 412                 talloc_free(tmp_ctx);
 413                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 414         }
 415         talloc_steal(mem_ctx, *msg);
 416         talloc_steal(mem_ctx, *domain_dn);
 417         talloc_free(tmp_ctx);
 418
 419         return NT_STATUS_OK;
 420 }