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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "system/time.h"
  25 #include "auth/auth.h"
  26 #include "db_wrap.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
  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
  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 /****************************************************************************
  75  Do a specific test for a SAM_ACCOUNT being vaild for this connection
  76  (ie not disabled, expired and the like).
  77 ****************************************************************************/
  78 _PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx,
  79                             struct ldb_context *sam_ctx,
  80                             uint32_t logon_parameters,
  81                             struct ldb_message *msg,
  82                             struct ldb_message *msg_domain_ref,
  83                             const char *logon_workstation,
  84                             const char *name_for_logs)
  85 {
  86         uint16_t acct_flags;
  87         const char *workstation_list;
  88         NTTIME acct_expiry;
  89         NTTIME must_change_time;
  90         NTTIME last_set_time;
  91
  92         struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL));
  93
  94         NTTIME now;
  95         DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs));
  96
  97         acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
  98
  99         acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 100         must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx,
 101                                                               domain_dn, msg);
 102         last_set_time = samdb_result_nttime(msg, "pwdLastSet", 0);
 103
 104         workstation_list = samdb_result_string(msg, "userWorkstations", NULL);
 105
 106         /* Quit if the account was disabled. */
 107         if (acct_flags & ACB_DISABLED) {
 108                 DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs));
 109                 return NT_STATUS_ACCOUNT_DISABLED;
 110         }
 111
 112         /* Quit if the account was locked out. */
 113         if (acct_flags & ACB_AUTOLOCK) {
 114                 DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs));
 115                 return NT_STATUS_ACCOUNT_LOCKED_OUT;
 116         }
 117
 118         /* Test account expire time */
 119         unix_to_nt_time(&now, time(NULL));
 120         if (now > acct_expiry) {
 121                 DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs));
 122                 DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n",
 123                          nt_time_string(mem_ctx, acct_expiry)));
 124                 return NT_STATUS_ACCOUNT_EXPIRED;
 125         }
 126
 127         if (!(acct_flags & ACB_PWNOEXP)) {
 128                 /* check for immediate expiry "must change at next logon" */
 129                 if (must_change_time == 0 && last_set_time != 0) {
 130                         DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n",
 131                                  name_for_logs));
 132                         return NT_STATUS_PASSWORD_MUST_CHANGE;
 133                 }
 134
 135                 /* check for expired password */
 136                 if ((must_change_time != 0) && (must_change_time < now)) {
 137                         DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n",
 138                                  name_for_logs));
 139                         DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n",
 140                                  nt_time_string(mem_ctx, must_change_time)));
 141                         return NT_STATUS_PASSWORD_EXPIRED;
 142                 }
 143         }
 144
 145         /* Test workstation. Workstation list is comma separated. */
 146         if (logon_workstation && workstation_list && *workstation_list) {
 147                 BOOL invalid_ws = True;
 148                 int i;
 149                 const char **workstations = str_list_make(mem_ctx, workstation_list, ",");
 150
 151                 for (i = 0; workstations && workstations[i]; i++) {
 152                         DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n",
 153                                   workstations[i], logon_workstation));
 154
 155                         if (strequal(workstations[i], logon_workstation) == 0) {
 156                                 invalid_ws = False;
 157                                 break;
 158                         }
 159                 }
 160
 161                 talloc_free(workstations);
 162
 163                 if (invalid_ws) {
 164                         return NT_STATUS_INVALID_WORKSTATION;
 165                 }
 166         }
 167
 168         if (acct_flags & ACB_DOMTRUST) {
 169                 DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs));
 170                 return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT;
 171         }
 172
 173         if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) {
 174                 if (acct_flags & ACB_SVRTRUST) {
 175                         DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs));
 176                         return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT;
 177                 }
 178         }
 179         if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) {
 180                 if (acct_flags & ACB_WSTRUST) {
 181                         DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs));
 182                         return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT;
 183                 }
 184         }
 185
 186         return NT_STATUS_OK;
 187 }
 188
 189 _PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 190                                   struct ldb_message *msg,
 191                                   struct ldb_message *msg_domain_ref,
 192                                   DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key,
 193                                   struct auth_serversupplied_info **_server_info)
 194 {
 195         struct auth_serversupplied_info *server_info;
 196         struct ldb_message **group_msgs;
 197         int group_ret;
 198         const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL };
 199         /* find list of sids */
 200         struct dom_sid **groupSIDs = NULL;
 201         struct dom_sid *account_sid;
 202         struct dom_sid *primary_group_sid;
 203         const char *str;
 204         struct ldb_dn *ncname;
 205         int i;
 206         uint_t rid;
 207         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 208
 209         group_ret = gendb_search(sam_ctx,
 210                                  tmp_ctx, NULL, &group_msgs, group_attrs,
 211                                  "(&(member=%s)(sAMAccountType=*))",
 212                                  ldb_dn_get_linearized(msg->dn));
 213         if (group_ret == -1) {
 214                 talloc_free(tmp_ctx);
 215                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 216         }
 217
 218         server_info = talloc(mem_ctx, struct auth_serversupplied_info);
 219         NT_STATUS_HAVE_NO_MEMORY(server_info);
 220
 221         if (group_ret > 0) {
 222                 groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret);
 223                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs);
 224         }
 225
 226         /* Need to unroll some nested groups, but not aliases */
 227         for (i = 0; i < group_ret; i++) {
 228                 groupSIDs[i] = samdb_result_dom_sid(groupSIDs,
 229                                                     group_msgs[i], "objectSid");
 230                 NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]);
 231         }
 232
 233         talloc_free(tmp_ctx);
 234
 235         account_sid = samdb_result_dom_sid(server_info, msg, "objectSid");
 236         NT_STATUS_HAVE_NO_MEMORY(account_sid);
 237
 238         primary_group_sid = dom_sid_dup(server_info, account_sid);
 239         NT_STATUS_HAVE_NO_MEMORY(primary_group_sid);
 240
 241         rid = samdb_result_uint(msg, "primaryGroupID", ~0);
 242         if (rid == ~0) {
 243                 if (group_ret > 0) {
 244                         primary_group_sid = groupSIDs[0];
 245                 } else {
 246                         primary_group_sid = NULL;
 247                 }
 248         } else {
 249                 primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid;
 250         }
 251
 252         server_info->account_sid = account_sid;
 253         server_info->primary_group_sid = primary_group_sid;
 254
 255         server_info->n_domain_groups = group_ret;
 256         server_info->domain_groups = groupSIDs;
 257
 258         server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL));
 259
 260         server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL));
 261
 262         str = samdb_result_string(msg, "displayName", "");
 263         server_info->full_name = talloc_strdup(server_info, str);
 264         NT_STATUS_HAVE_NO_MEMORY(server_info->full_name);
 265
 266         str = samdb_result_string(msg, "scriptPath", "");
 267         server_info->logon_script = talloc_strdup(server_info, str);
 268         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script);
 269
 270         str = samdb_result_string(msg, "profilePath", "");
 271         server_info->profile_path = talloc_strdup(server_info, str);
 272         NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path);
 273
 274         str = samdb_result_string(msg, "homeDirectory", "");
 275         server_info->home_directory = talloc_strdup(server_info, str);
 276         NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory);
 277
 278         str = samdb_result_string(msg, "homeDrive", "");
 279         server_info->home_drive = talloc_strdup(server_info, str);
 280         NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive);
 281
 282         server_info->logon_server = talloc_strdup(server_info, lp_netbios_name());
 283         NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server);
 284
 285         server_info->last_logon = samdb_result_nttime(msg, "lastLogon", 0);
 286         server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0);
 287         server_info->acct_expiry = samdb_result_nttime(msg, "accountExpires", 0);
 288         server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0);
 289
 290         ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL);
 291         if (!ncname) {
 292                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 293         }
 294         server_info->allow_password_change
 295                 = samdb_result_allow_password_change(sam_ctx, mem_ctx,
 296                                                      ncname, msg, "pwdLastSet");
 297         server_info->force_password_change
 298                 = samdb_result_force_password_change(sam_ctx, mem_ctx,
 299                                                      ncname, msg);
 300
 301         server_info->logon_count = samdb_result_uint(msg, "logonCount", 0);
 302         server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0);
 303
 304         server_info->acct_flags = samdb_result_acct_flags(msg, "userAccountControl");
 305
 306         server_info->user_session_key = user_sess_key;
 307         server_info->lm_session_key = lm_sess_key;
 308
 309         server_info->authenticated = True;
 310
 311         *_server_info = server_info;
 312
 313         return NT_STATUS_OK;
 314 }
 315
 316 _PUBLIC_ NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx,
 317                                    TALLOC_CTX *mem_ctx, const char *principal,
 318                                    struct ldb_message ***msgs,
 319                                    struct ldb_message ***msgs_domain_ref)
 320 {
 321         struct ldb_dn *user_dn, *domain_dn;
 322         NTSTATUS nt_status;
 323         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 324         int ret;
 325         struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx);
 326
 327         if (!tmp_ctx) {
 328                 return NT_STATUS_NO_MEMORY;
 329         }
 330
 331         nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn);
 332         if (!NT_STATUS_IS_OK(nt_status)) {
 333                 talloc_free(tmp_ctx);
 334                 return nt_status;
 335         }
 336
 337         /* grab domain info from the reference */
 338         ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs,
 339                            "(ncName=%s)", ldb_dn_get_linearized(domain_dn));
 340
 341         if (ret != 1) {
 342                 talloc_free(tmp_ctx);
 343                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 344         }
 345
 346         /* pull the user attributes */
 347         ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs);
 348         if (ret != 1) {
 349                 talloc_free(tmp_ctx);
 350                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 351         }
 352         talloc_steal(mem_ctx, *msgs);
 353         talloc_steal(mem_ctx, *msgs_domain_ref);
 354         talloc_free(tmp_ctx);
 355
 356         return NT_STATUS_OK;
 357 }
 358
 359 /* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */
 360 NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx, const char *principal,
 361                                        struct auth_serversupplied_info **server_info)
 362 {
 363         NTSTATUS nt_status;
 364         DATA_BLOB user_sess_key = data_blob(NULL, 0);
 365         DATA_BLOB lm_sess_key = data_blob(NULL, 0);
 366
 367         struct ldb_message **msgs;
 368         struct ldb_message **msgs_domain_ref;
 369         struct ldb_context *sam_ctx;
 370
 371         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 372         if (!tmp_ctx) {
 373                 return NT_STATUS_NO_MEMORY;
 374         }
 375
 376         sam_ctx = samdb_connect(tmp_ctx, system_session(tmp_ctx));
 377         if (sam_ctx == NULL) {
 378                 talloc_free(tmp_ctx);
 379                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 380         }
 381
 382         nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal,
 383                                               &msgs, &msgs_domain_ref);
 384         if (!NT_STATUS_IS_OK(nt_status)) {
 385                 return nt_status;
 386         }
 387
 388         nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, msgs[0], msgs_domain_ref[0],
 389                                              user_sess_key, lm_sess_key,
 390                                              server_info);
 391         if (NT_STATUS_IS_OK(nt_status)) {
 392                 talloc_steal(mem_ctx, *server_info);
 393         }
 394         talloc_free(tmp_ctx);
 395         return nt_status;
 396 }