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