source4/auth/ntlm/auth_sam.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2009
   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 <ldb.h>
  25 #include "libcli/ldap/ldap_ndr.h"
  26 #include "libcli/security/security.h"
  27 #include "auth/auth.h"
  28 #include "../libcli/auth/ntlm_check.h"
  29 #include "auth/ntlm/auth_proto.h"
  30 #include "auth/auth_sam.h"
  31 #include "dsdb/samdb/samdb.h"
  32 #include "dsdb/common/util.h"
  33 #include "param/param.h"
  34 #include "librpc/gen_ndr/ndr_irpc_c.h"
  35 #include "lib/messaging/irpc.h"
  36 #include "libcli/auth/libcli_auth.h"
  37 #include "libds/common/roles.h"
  38
  39 NTSTATUS auth_sam_init(void);
  40
  41 extern const char *user_attrs[];
  42 extern const char *domain_ref_attrs[];
  43
  44 /****************************************************************************
  45  Look for the specified user in the sam, return ldb result structures
  46 ****************************************************************************/
  47
  48 static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
  49                                        const char *account_name,
  50                                        struct ldb_dn *domain_dn,
  51                                        struct ldb_message **ret_msg)
  52 {
  53         int ret;
  54
  55         /* pull the user attributes */
  56         ret = dsdb_search_one(sam_ctx, mem_ctx, ret_msg, domain_dn, LDB_SCOPE_SUBTREE,
  57                               user_attrs,
  58                               DSDB_SEARCH_SHOW_EXTENDED_DN,
  59                               "(&(sAMAccountName=%s)(objectclass=user))",
  60                               ldb_binary_encode_string(mem_ctx, account_name));
  61         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  62                 DEBUG(3,("sam_search_user: Couldn't find user [%s] in samdb, under %s\n",
  63                          account_name, ldb_dn_get_linearized(domain_dn)));
  64                 return NT_STATUS_NO_SUCH_USER;
  65         }
  66         if (ret != LDB_SUCCESS) {
  67                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
  68         }
  69
  70         return NT_STATUS_OK;
  71 }
  72
  73 /****************************************************************************
  74  Do a specific test for an smb password being correct, given a smb_password and
  75  the lanman and NT responses.
  76 ****************************************************************************/
  77 static NTSTATUS authsam_password_ok(struct auth4_context *auth_context,
  78                                     TALLOC_CTX *mem_ctx,
  79                                     uint16_t acct_flags,
  80                                     const struct samr_Password *lm_pwd,
  81                                     const struct samr_Password *nt_pwd,
  82                                     const struct auth_usersupplied_info *user_info,
  83                                     DATA_BLOB *user_sess_key,
  84                                     DATA_BLOB *lm_sess_key)
  85 {
  86         NTSTATUS status;
  87
  88         switch (user_info->password_state) {
  89         case AUTH_PASSWORD_PLAIN:
  90         {
  91                 const struct auth_usersupplied_info *user_info_temp;
  92                 status = encrypt_user_info(mem_ctx, auth_context,
  93                                            AUTH_PASSWORD_HASH,
  94                                            user_info, &user_info_temp);
  95                 if (!NT_STATUS_IS_OK(status)) {
  96                         DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status)));
  97                         return status;
  98                 }
  99                 user_info = user_info_temp;
 100
 101                 /*fall through*/
 102         }
 103         case AUTH_PASSWORD_HASH:
 104                 *lm_sess_key = data_blob(NULL, 0);
 105                 *user_sess_key = data_blob(NULL, 0);
 106                 status = hash_password_check(mem_ctx,
 107                                              lpcfg_lanman_auth(auth_context->lp_ctx),
 108                                              user_info->password.hash.lanman,
 109                                              user_info->password.hash.nt,
 110                                              user_info->mapped.account_name,
 111                                              lm_pwd, nt_pwd);
 112                 NT_STATUS_NOT_OK_RETURN(status);
 113                 break;
 114
 115         case AUTH_PASSWORD_RESPONSE:
 116                 status = ntlm_password_check(mem_ctx,
 117                                              lpcfg_lanman_auth(auth_context->lp_ctx),
 118                                                  lpcfg_ntlm_auth(auth_context->lp_ctx),
 119                                              user_info->logon_parameters,
 120                                              &auth_context->challenge.data,
 121                                              &user_info->password.response.lanman,
 122                                              &user_info->password.response.nt,
 123                                              user_info->mapped.account_name,
 124                                              user_info->client.account_name,
 125                                              user_info->client.domain_name,
 126                                              lm_pwd, nt_pwd,
 127                                              user_sess_key, lm_sess_key);
 128                 NT_STATUS_NOT_OK_RETURN(status);
 129                 break;
 130         }
 131
 132         return NT_STATUS_OK;
 133 }
 134
 135
 136 /*
 137   send a message to the drepl server telling it to initiate a
 138   REPL_SECRET getncchanges extended op to fetch the users secrets
 139  */
 140 static void auth_sam_trigger_repl_secret(struct auth4_context *auth_context,
 141                                          struct ldb_dn *user_dn)
 142 {
 143         struct dcerpc_binding_handle *irpc_handle;
 144         struct drepl_trigger_repl_secret r;
 145         struct tevent_req *req;
 146         TALLOC_CTX *tmp_ctx;
 147
 148         tmp_ctx = talloc_new(auth_context);
 149         if (tmp_ctx == NULL) {
 150                 return;
 151         }
 152
 153         irpc_handle = irpc_binding_handle_by_name(tmp_ctx, auth_context->msg_ctx,
 154                                                   "dreplsrv",
 155                                                   &ndr_table_irpc);
 156         if (irpc_handle == NULL) {
 157                 DEBUG(1,(__location__ ": Unable to get binding handle for dreplsrv\n"));
 158                 TALLOC_FREE(tmp_ctx);
 159                 return;
 160         }
 161
 162         r.in.user_dn = ldb_dn_get_linearized(user_dn);
 163
 164         /*
 165          * This seem to rely on the current IRPC implementation,
 166          * which delivers the message in the _send function.
 167          *
 168          * TODO: we need a ONE_WAY IRPC handle and register
 169          * a callback and wait for it to be triggered!
 170          */
 171         req = dcerpc_drepl_trigger_repl_secret_r_send(tmp_ctx,
 172                                                       auth_context->event_ctx,
 173                                                       irpc_handle,
 174                                                       &r);
 175
 176         /* we aren't interested in a reply */
 177         talloc_free(req);
 178         TALLOC_FREE(tmp_ctx);
 179 }
 180
 181
 182 /*
 183  * Check that a password is OK, and update badPwdCount if required.
 184  */
 185
 186 static NTSTATUS authsam_password_check_and_record(struct auth4_context *auth_context,
 187                                                   TALLOC_CTX *mem_ctx,
 188                                                   struct ldb_dn *domain_dn,
 189                                                   struct ldb_message *msg,
 190                                                   uint16_t acct_flags,
 191                                                   const struct auth_usersupplied_info *user_info,
 192                                                   DATA_BLOB *user_sess_key,
 193                                                   DATA_BLOB *lm_sess_key)
 194 {
 195         NTSTATUS nt_status;
 196         NTSTATUS auth_status;
 197         TALLOC_CTX *tmp_ctx;
 198         int i, ret;
 199         int history_len = 0;
 200         struct ldb_context *sam_ctx = auth_context->sam_ctx;
 201         const char * const attrs[] = { "pwdHistoryLength", NULL };
 202         struct ldb_message *dom_msg;
 203         struct samr_Password *lm_pwd;
 204         struct samr_Password *nt_pwd;
 205
 206         tmp_ctx = talloc_new(mem_ctx);
 207         if (tmp_ctx == NULL) {
 208                 return NT_STATUS_NO_MEMORY;
 209         }
 210
 211         /*
 212          * This call does more than what it appears to do, it also
 213          * checks for the account lockout.
 214          *
 215          * It is done here so that all parts of Samba that read the
 216          * password refuse to even operate on it if the account is
 217          * locked out, to avoid mistakes like CVE-2013-4496.
 218          */
 219         nt_status = samdb_result_passwords(tmp_ctx, auth_context->lp_ctx,
 220                                            msg, &lm_pwd, &nt_pwd);
 221         if (!NT_STATUS_IS_OK(nt_status)) {
 222                 TALLOC_FREE(tmp_ctx);
 223                 return nt_status;
 224         }
 225
 226         if (lm_pwd == NULL && nt_pwd == NULL) {
 227                 bool am_rodc;
 228                 if (samdb_rodc(auth_context->sam_ctx, &am_rodc) == LDB_SUCCESS && am_rodc) {
 229                         /*
 230                          * we don't have passwords for this
 231                          * account. We are an RODC, and this account
 232                          * may be one for which we either are denied
 233                          * REPL_SECRET replication or we haven't yet
 234                          * done the replication. We return
 235                          * NT_STATUS_NOT_IMPLEMENTED which tells the
 236                          * auth code to try the next authentication
 237                          * mechanism. We also send a message to our
 238                          * drepl server to tell it to try and
 239                          * replicate the secrets for this account.
 240                          *
 241                          * TODO: Should we only trigger this is detected
 242                          * there's a chance that the password might be
 243                          * replicated, we should be able to detect this
 244                          * based on msDS-NeverRevealGroup.
 245                          */
 246                         auth_sam_trigger_repl_secret(auth_context, msg->dn);
 247                         TALLOC_FREE(tmp_ctx);
 248                         return NT_STATUS_NOT_IMPLEMENTED;
 249                 }
 250         }
 251
 252         auth_status = authsam_password_ok(auth_context, tmp_ctx,
 253                                           acct_flags,
 254                                           lm_pwd, nt_pwd,
 255                                           user_info,
 256                                           user_sess_key, lm_sess_key);
 257         if (NT_STATUS_IS_OK(auth_status)) {
 258                 if (user_sess_key->data) {
 259                         talloc_steal(mem_ctx, user_sess_key->data);
 260                 }
 261                 if (lm_sess_key->data) {
 262                         talloc_steal(mem_ctx, lm_sess_key->data);
 263                 }
 264                 TALLOC_FREE(tmp_ctx);
 265                 return NT_STATUS_OK;
 266         }
 267         *user_sess_key = data_blob_null;
 268         *lm_sess_key = data_blob_null;
 269
 270         if (!NT_STATUS_EQUAL(auth_status, NT_STATUS_WRONG_PASSWORD)) {
 271                 TALLOC_FREE(tmp_ctx);
 272                 return auth_status;
 273         }
 274
 275         /*
 276          * We only continue if this was a wrong password
 277          * and we'll always return NT_STATUS_WRONG_PASSWORD
 278          * no matter what error happens.
 279          */
 280
 281         /* pull the domain password property attributes */
 282         ret = dsdb_search_one(sam_ctx, tmp_ctx, &dom_msg, domain_dn, LDB_SCOPE_BASE,
 283                               attrs, 0, "objectClass=domain");
 284         if (ret == LDB_SUCCESS) {
 285                 history_len = ldb_msg_find_attr_as_uint(dom_msg, "pwdHistoryLength", 0);
 286         } else if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 287                 DEBUG(3,("Couldn't find domain %s: %s!\n",
 288                          ldb_dn_get_linearized(domain_dn),
 289                          ldb_errstring(sam_ctx)));
 290         } else {
 291                 DEBUG(3,("error finding domain %s: %s!\n",
 292                          ldb_dn_get_linearized(domain_dn),
 293                          ldb_errstring(sam_ctx)));
 294         }
 295
 296         for (i = 1; i < MIN(history_len, 3); i++) {
 297                 struct samr_Password zero_string_hash;
 298                 struct samr_Password zero_string_des_hash;
 299                 struct samr_Password *nt_history_pwd = NULL;
 300                 struct samr_Password *lm_history_pwd = NULL;
 301                 NTTIME pwdLastSet;
 302                 struct timeval tv_now;
 303                 NTTIME now;
 304                 int allowed_period_mins;
 305                 NTTIME allowed_period;
 306
 307                 nt_status = samdb_result_passwords_from_history(tmp_ctx,
 308                                                         auth_context->lp_ctx,
 309                                                         msg, i,
 310                                                         &lm_history_pwd,
 311                                                         &nt_history_pwd);
 312                 if (!NT_STATUS_IS_OK(nt_status)) {
 313                         /*
 314                          * If we don't find element 'i' we won't find
 315                          * 'i+1' ...
 316                          */
 317                         break;
 318                 }
 319
 320                 /*
 321                  * We choose to avoid any issues
 322                  * around different LM and NT history
 323                  * lengths by only checking the NT
 324                  * history
 325                  */
 326                 if (nt_history_pwd == NULL) {
 327                         /*
 328                          * If we don't find element 'i' we won't find
 329                          * 'i+1' ...
 330                          */
 331                         break;
 332                 }
 333
 334                 /* Skip over all-zero hashes in the history */
 335                 if (all_zero(nt_history_pwd->hash,
 336                              sizeof(nt_history_pwd->hash))) {
 337                         continue;
 338                 }
 339
 340                 /*
 341                  * This looks odd, but the password_hash module writes this in if
 342                  * (somehow) we didn't have an old NT hash
 343                  */
 344
 345                 E_md4hash("", zero_string_hash.hash);
 346                 if (memcmp(nt_history_pwd->hash, zero_string_hash.hash, 16) == 0) {
 347                         continue;
 348                 }
 349
 350                 E_deshash("", zero_string_des_hash.hash);
 351                 if (!lm_history_pwd || memcmp(lm_history_pwd->hash, zero_string_des_hash.hash, 16) == 0) {
 352                         lm_history_pwd = NULL;
 353                 }
 354
 355                 auth_status = authsam_password_ok(auth_context, tmp_ctx,
 356                                                   acct_flags,
 357                                                   lm_history_pwd,
 358                                                   nt_history_pwd,
 359                                                   user_info,
 360                                                   user_sess_key,
 361                                                   lm_sess_key);
 362                 if (!NT_STATUS_IS_OK(auth_status)) {
 363                         /*
 364                          * If this was not a correct password, try the next
 365                          * one from the history
 366                          */
 367                         *user_sess_key = data_blob_null;
 368                         *lm_sess_key = data_blob_null;
 369                         continue;
 370                 }
 371
 372                 if (i != 1) {
 373                         /*
 374                          * The authentication was OK, but not against
 375                          * the previous password, which is stored at index 1.
 376                          *
 377                          * We just return the original wrong password.
 378                          * This skips the update of the bad pwd count,
 379                          * because this is almost certainly user error
 380                          * (or automatic login on a computer using a cached
 381                          * password from before the password change),
 382                          * not an attack.
 383                          */
 384                         TALLOC_FREE(tmp_ctx);
 385                         return NT_STATUS_WRONG_PASSWORD;
 386                 }
 387
 388                 if (user_info->password_state != AUTH_PASSWORD_RESPONSE) {
 389                         /*
 390                          * The authentication was OK against the previous password,
 391                          * but it's not a NTLM network authentication.
 392                          *
 393                          * We just return the original wrong password.
 394                          * This skips the update of the bad pwd count,
 395                          * because this is almost certainly user error
 396                          * (or automatic login on a computer using a cached
 397                          * password from before the password change),
 398                          * not an attack.
 399                          */
 400                         TALLOC_FREE(tmp_ctx);
 401                         return NT_STATUS_WRONG_PASSWORD;
 402                 }
 403
 404                 /*
 405                  * If the password was OK, it's a NTLM network authentication
 406                  * and it was the previous password.
 407                  *
 408                  * Now we see if it is within the grace period,
 409                  * so that we don't break cached sessions on other computers
 410                  * before the user can lock and unlock their other screens
 411                  * (resetting their cached password).
 412                  *
 413                  * See http://support.microsoft.com/kb/906305
 414                  * OldPasswordAllowedPeriod ("old password allowed period")
 415                  * is specified in minutes. The default is 60.
 416                  */
 417                 allowed_period_mins = lpcfg_old_password_allowed_period(auth_context->lp_ctx);
 418                 /*
 419                  * NTTIME uses 100ns units
 420                  */
 421                 allowed_period = allowed_period_mins * 60 * 1000*1000*10;
 422                 pwdLastSet = samdb_result_nttime(msg, "pwdLastSet", 0);
 423                 tv_now = timeval_current();
 424                 now = timeval_to_nttime(&tv_now);
 425
 426                 if (now < pwdLastSet) {
 427                         /*
 428                          * time jump?
 429                          *
 430                          * We just return the original wrong password.
 431                          * This skips the update of the bad pwd count,
 432                          * because this is almost certainly user error
 433                          * (or automatic login on a computer using a cached
 434                          * password from before the password change),
 435                          * not an attack.
 436                          */
 437                         TALLOC_FREE(tmp_ctx);
 438                         return NT_STATUS_WRONG_PASSWORD;
 439                 }
 440
 441                 if ((now - pwdLastSet) >= allowed_period) {
 442                         /*
 443                          * The allowed period is over.
 444                          *
 445                          * We just return the original wrong password.
 446                          * This skips the update of the bad pwd count,
 447                          * because this is almost certainly user error
 448                          * (or automatic login on a computer using a cached
 449                          * password from before the password change),
 450                          * not an attack.
 451                          */
 452                         TALLOC_FREE(tmp_ctx);
 453                         return NT_STATUS_WRONG_PASSWORD;
 454                 }
 455
 456                 /*
 457                  * We finally allow the authentication with the
 458                  * previous password within the allowed period.
 459                  */
 460                 if (user_sess_key->data) {
 461                         talloc_steal(mem_ctx, user_sess_key->data);
 462                 }
 463                 if (lm_sess_key->data) {
 464                         talloc_steal(mem_ctx, lm_sess_key->data);
 465                 }
 466
 467                 TALLOC_FREE(tmp_ctx);
 468                 return auth_status;
 469         }
 470
 471         /*
 472          * If we are not in the allowed period or match an old password,
 473          * we didn't return early. Now update the badPwdCount et al.
 474          */
 475         nt_status = authsam_update_bad_pwd_count(auth_context->sam_ctx,
 476                                                  msg, domain_dn);
 477         if (!NT_STATUS_IS_OK(nt_status)) {
 478                 /*
 479                  * We need to return the original
 480                  * NT_STATUS_WRONG_PASSWORD error, so there isn't
 481                  * anything more we can do than write something into
 482                  * the log
 483                  */
 484                 DEBUG(0, ("Failed to note bad password for user [%s]: %s\n",
 485                           user_info->mapped.account_name,
 486                           nt_errstr(nt_status)));
 487         }
 488
 489         TALLOC_FREE(tmp_ctx);
 490         return NT_STATUS_WRONG_PASSWORD;
 491 }
 492
 493 static NTSTATUS authsam_authenticate(struct auth4_context *auth_context,
 494                                      TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx,
 495                                      struct ldb_dn *domain_dn,
 496                                      struct ldb_message *msg,
 497                                      const struct auth_usersupplied_info *user_info,
 498                                      DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key)
 499 {
 500         NTSTATUS nt_status;
 501         bool interactive = (user_info->password_state == AUTH_PASSWORD_HASH);
 502         uint32_t acct_flags = samdb_result_acct_flags(msg, NULL);
 503         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 504         if (!tmp_ctx) {
 505                 return NT_STATUS_NO_MEMORY;
 506         }
 507
 508         /* You can only do an interactive login to normal accounts */
 509         if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) {
 510                 if (!(acct_flags & ACB_NORMAL)) {
 511                         TALLOC_FREE(tmp_ctx);
 512                         return NT_STATUS_NO_SUCH_USER;
 513                 }
 514                 if (acct_flags & ACB_SMARTCARD_REQUIRED) {
 515                         if (acct_flags & ACB_DISABLED) {
 516                                 DEBUG(2,("authsam_authenticate: Account for user '%s' "
 517                                          "was disabled.\n",
 518                                          user_info->mapped.account_name));
 519                                 TALLOC_FREE(tmp_ctx);
 520                                 return NT_STATUS_ACCOUNT_DISABLED;
 521                         }
 522                         DEBUG(2,("authsam_authenticate: Account for user '%s' "
 523                                  "requires interactive smartcard logon.\n",
 524                                  user_info->mapped.account_name));
 525                         TALLOC_FREE(tmp_ctx);
 526                         return NT_STATUS_SMARTCARD_LOGON_REQUIRED;
 527                 }
 528         }
 529
 530         nt_status = authsam_password_check_and_record(auth_context, tmp_ctx,
 531                                                       domain_dn, msg, acct_flags,
 532                                                       user_info,
 533                                                       user_sess_key, lm_sess_key);
 534         if (!NT_STATUS_IS_OK(nt_status)) {
 535                 TALLOC_FREE(tmp_ctx);
 536                 return nt_status;
 537         }
 538
 539         nt_status = authsam_account_ok(tmp_ctx, auth_context->sam_ctx,
 540                                        user_info->logon_parameters,
 541                                        domain_dn,
 542                                        msg,
 543                                        user_info->workstation_name,
 544                                        user_info->mapped.account_name,
 545                                        false, false);
 546         if (!NT_STATUS_IS_OK(nt_status)) {
 547                 TALLOC_FREE(tmp_ctx);
 548                 return nt_status;
 549         }
 550
 551         nt_status = authsam_logon_success_accounting(auth_context->sam_ctx,
 552                                                      msg, domain_dn,
 553                                                      interactive);
 554         if (!NT_STATUS_IS_OK(nt_status)) {
 555                 TALLOC_FREE(tmp_ctx);
 556                 return nt_status;
 557         }
 558
 559         if (user_sess_key && user_sess_key->data) {
 560                 talloc_steal(mem_ctx, user_sess_key->data);
 561         }
 562         if (lm_sess_key && lm_sess_key->data) {
 563                 talloc_steal(mem_ctx, lm_sess_key->data);
 564         }
 565
 566         TALLOC_FREE(tmp_ctx);
 567         return nt_status;
 568 }
 569
 570
 571
 572 static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx,
 573                                                  TALLOC_CTX *mem_ctx,
 574                                                  const struct auth_usersupplied_info *user_info,
 575                                                  struct auth_user_info_dc **user_info_dc)
 576 {
 577         NTSTATUS nt_status;
 578         const char *account_name = user_info->mapped.account_name;
 579         struct ldb_message *msg;
 580         struct ldb_dn *domain_dn;
 581         DATA_BLOB user_sess_key, lm_sess_key;
 582         TALLOC_CTX *tmp_ctx;
 583         const char *p = NULL;
 584
 585         if (ctx->auth_ctx->sam_ctx == NULL) {
 586                 DEBUG(0, ("No SAM available, cannot log in users\n"));
 587                 return NT_STATUS_INVALID_SYSTEM_SERVICE;
 588         }
 589
 590         if (!account_name || !*account_name) {
 591                 /* 'not for me' */
 592                 return NT_STATUS_NOT_IMPLEMENTED;
 593         }
 594
 595         tmp_ctx = talloc_new(mem_ctx);
 596         if (!tmp_ctx) {
 597                 return NT_STATUS_NO_MEMORY;
 598         }
 599
 600         domain_dn = ldb_get_default_basedn(ctx->auth_ctx->sam_ctx);
 601         if (domain_dn == NULL) {
 602                 talloc_free(tmp_ctx);
 603                 return NT_STATUS_NO_SUCH_DOMAIN;
 604         }
 605
 606         p = strchr_m(account_name, '@');
 607         if (p != NULL) {
 608                 const char *nt4_domain = NULL;
 609                 const char *nt4_account = NULL;
 610                 bool is_my_domain = false;
 611
 612                 nt_status = crack_name_to_nt4_name(mem_ctx,
 613                                                    ctx->auth_ctx->event_ctx,
 614                                                    ctx->auth_ctx->lp_ctx,
 615                                                    /*
 616                                                     * DRSUAPI_DS_NAME_FORMAT_UPN_FOR_LOGON ?
 617                                                     */
 618                                                    DRSUAPI_DS_NAME_FORMAT_USER_PRINCIPAL,
 619                                                    account_name,
 620                                                    &nt4_domain, &nt4_account);
 621                 if (!NT_STATUS_IS_OK(nt_status)) {
 622                         talloc_free(tmp_ctx);
 623                         return NT_STATUS_NO_SUCH_USER;
 624                 }
 625
 626                 is_my_domain = lpcfg_is_mydomain(ctx->auth_ctx->lp_ctx, nt4_domain);
 627                 if (!is_my_domain) {
 628                         /*
 629                          * This is a user within our forest,
 630                          * but in a different domain,
 631                          * we're not authoritative
 632                          */
 633                         talloc_free(tmp_ctx);
 634                         return NT_STATUS_NOT_IMPLEMENTED;
 635                 }
 636
 637                 /*
 638                  * Let's use the NT4 account name for the lookup.
 639                  */
 640                 account_name = nt4_account;
 641         }
 642
 643         nt_status = authsam_search_account(tmp_ctx, ctx->auth_ctx->sam_ctx, account_name, domain_dn, &msg);
 644         if (!NT_STATUS_IS_OK(nt_status)) {
 645                 talloc_free(tmp_ctx);
 646                 return nt_status;
 647         }
 648
 649         nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, ctx->auth_ctx->sam_ctx, domain_dn, msg, user_info,
 650                                          &user_sess_key, &lm_sess_key);
 651         if (!NT_STATUS_IS_OK(nt_status)) {
 652                 talloc_free(tmp_ctx);
 653                 return nt_status;
 654         }
 655
 656         nt_status = authsam_make_user_info_dc(tmp_ctx, ctx->auth_ctx->sam_ctx,
 657                                              lpcfg_netbios_name(ctx->auth_ctx->lp_ctx),
 658                                              lpcfg_sam_name(ctx->auth_ctx->lp_ctx),
 659                                              lpcfg_sam_dnsname(ctx->auth_ctx->lp_ctx),
 660                                              domain_dn,
 661                                              msg,
 662                                              user_sess_key, lm_sess_key,
 663                                              user_info_dc);
 664         if (!NT_STATUS_IS_OK(nt_status)) {
 665                 talloc_free(tmp_ctx);
 666                 return nt_status;
 667         }
 668
 669         talloc_steal(mem_ctx, *user_info_dc);
 670         talloc_free(tmp_ctx);
 671
 672         return NT_STATUS_OK;
 673 }
 674
 675 static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx,
 676                                                 TALLOC_CTX *mem_ctx,
 677                                                 const struct auth_usersupplied_info *user_info)
 678 {
 679         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 680                 return NT_STATUS_NOT_IMPLEMENTED;
 681         }
 682
 683         return NT_STATUS_OK;
 684 }
 685
 686 /****************************************************************************
 687 Check SAM security (above) but with a few extra checks.
 688 ****************************************************************************/
 689 static NTSTATUS authsam_want_check(struct auth_method_context *ctx,
 690                                    TALLOC_CTX *mem_ctx,
 691                                    const struct auth_usersupplied_info *user_info)
 692 {
 693         const char *effective_domain = user_info->mapped.domain_name;
 694         bool is_local_name = false;
 695         bool is_my_domain = false;
 696         const char *p = NULL;
 697         struct dsdb_trust_routing_table *trt = NULL;
 698         const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
 699         NTSTATUS status;
 700
 701         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 702                 return NT_STATUS_NOT_IMPLEMENTED;
 703         }
 704
 705         is_local_name = lpcfg_is_myname(ctx->auth_ctx->lp_ctx,
 706                                         effective_domain);
 707
 708         /* check whether or not we service this domain/workgroup name */
 709         switch (lpcfg_server_role(ctx->auth_ctx->lp_ctx)) {
 710         case ROLE_STANDALONE:
 711                 return NT_STATUS_OK;
 712
 713         case ROLE_DOMAIN_MEMBER:
 714                 if (is_local_name) {
 715                         return NT_STATUS_OK;
 716                 }
 717
 718                 DBG_DEBUG("%s is not one of my local names (DOMAIN_MEMBER)\n",
 719                           effective_domain);
 720                 return NT_STATUS_NOT_IMPLEMENTED;
 721
 722         case ROLE_ACTIVE_DIRECTORY_DC:
 723                 /* handled later */
 724                 break;
 725
 726         default:
 727                 DBG_ERR("lpcfg_server_role() has an undefined value\n");
 728                 return NT_STATUS_INVALID_SERVER_STATE;
 729         }
 730
 731         /*
 732          * Now we handle the AD DC case...
 733          */
 734
 735         is_my_domain = lpcfg_is_my_domain_or_realm(ctx->auth_ctx->lp_ctx,
 736                                                    effective_domain);
 737         if (is_my_domain) {
 738                 return NT_STATUS_OK;
 739         }
 740
 741         if (user_info->mapped_state) {
 742                 /*
 743                  * The caller already did a cracknames call.
 744                  */
 745                 DBG_DEBUG("%s is not one domain name (DC)\n",
 746                           effective_domain);
 747                 return NT_STATUS_NOT_IMPLEMENTED;
 748         }
 749
 750         if (effective_domain != NULL && !strequal(effective_domain, "")) {
 751                 DBG_DEBUG("%s is not one domain name (DC)\n",
 752                           effective_domain);
 753                 return NT_STATUS_NOT_IMPLEMENTED;
 754         }
 755
 756         p = strchr_m(user_info->mapped.account_name, '@');
 757         if (p == NULL) {
 758                 if (effective_domain == NULL) {
 759                         return NT_STATUS_OK;
 760                 }
 761                 DEBUG(6,("authsam_check_password: '' without upn not handled (DC)\n"));
 762                 return NT_STATUS_NOT_IMPLEMENTED;
 763         }
 764
 765         effective_domain = p + 1;
 766         is_my_domain = lpcfg_is_my_domain_or_realm(ctx->auth_ctx->lp_ctx,
 767                                                    effective_domain);
 768         if (is_my_domain) {
 769                 return NT_STATUS_OK;
 770         }
 771
 772         if (strequal(effective_domain, "")) {
 773                 DBG_DEBUG("authsam_check_password: upn without realm (DC)\n");
 774                 return NT_STATUS_NOT_IMPLEMENTED;
 775         }
 776
 777         /*
 778          * as last option we check the routing table if the
 779          * domain is within our forest.
 780          */
 781         status = dsdb_trust_routing_table_load(ctx->auth_ctx->sam_ctx,
 782                                                mem_ctx, &trt);
 783         if (!NT_STATUS_IS_OK(status)) {
 784                 DBG_ERR("authsam_check_password: dsdb_trust_routing_table_load() %s\n",
 785                          nt_errstr(status));
 786                 return status;
 787         }
 788
 789         tdo = dsdb_trust_routing_by_name(trt, effective_domain);
 790         if (tdo == NULL) {
 791                 DBG_DEBUG("%s is not a known TLN (DC)\n",
 792                           effective_domain);
 793                 TALLOC_FREE(trt);
 794                 return NT_STATUS_NOT_IMPLEMENTED;
 795         }
 796
 797         if (!(tdo->trust_attributes & LSA_TRUST_ATTRIBUTE_WITHIN_FOREST)) {
 798                 DBG_DEBUG("%s is not a TLN in our forest (DC)\n",
 799                           effective_domain);
 800                 TALLOC_FREE(trt);
 801                 return NT_STATUS_NOT_IMPLEMENTED;
 802         }
 803
 804         /*
 805          * This principal is within our forest.
 806          * we'll later do a crack_name_to_nt4_name()
 807          * to check if it's in our domain.
 808          */
 809         TALLOC_FREE(trt);
 810         return NT_STATUS_OK;
 811 }
 812
 813 static NTSTATUS authsam_failtrusts_want_check(struct auth_method_context *ctx,
 814                                               TALLOC_CTX *mem_ctx,
 815                                               const struct auth_usersupplied_info *user_info)
 816 {
 817         const char *effective_domain = user_info->mapped.domain_name;
 818         struct dsdb_trust_routing_table *trt = NULL;
 819         const struct lsa_TrustDomainInfoInfoEx *tdo = NULL;
 820         NTSTATUS status;
 821
 822         /* check whether or not we service this domain/workgroup name */
 823         switch (lpcfg_server_role(ctx->auth_ctx->lp_ctx)) {
 824         case ROLE_ACTIVE_DIRECTORY_DC:
 825                 /* handled later */
 826                 break;
 827
 828         default:
 829                 DBG_ERR("lpcfg_server_role() has an undefined value\n");
 830                 return NT_STATUS_NOT_IMPLEMENTED;
 831         }
 832
 833         /*
 834          * Now we handle the AD DC case...
 835          */
 836         if (!user_info->mapped.account_name || !*user_info->mapped.account_name) {
 837                 return NT_STATUS_NOT_IMPLEMENTED;
 838         }
 839
 840         if (effective_domain == NULL || strequal(effective_domain, "")) {
 841                 const char *p = NULL;
 842
 843                 p = strchr_m(user_info->mapped.account_name, '@');
 844                 if (p != NULL) {
 845                         effective_domain = p + 1;
 846                 }
 847         }
 848
 849         if (effective_domain == NULL || strequal(effective_domain, "")) {
 850                 DBG_DEBUG("%s is not a trusted domain\n",
 851                           effective_domain);
 852                 return NT_STATUS_NOT_IMPLEMENTED;
 853         }
 854
 855         /*
 856          * as last option we check the routing table if the
 857          * domain is within our forest.
 858          */
 859         status = dsdb_trust_routing_table_load(ctx->auth_ctx->sam_ctx,
 860                                                mem_ctx, &trt);
 861         if (!NT_STATUS_IS_OK(status)) {
 862                 DBG_ERR("authsam_check_password: dsdb_trust_routing_table_load() %s\n",
 863                          nt_errstr(status));
 864                 return status;
 865         }
 866
 867         tdo = dsdb_trust_routing_by_name(trt, effective_domain);
 868         if (tdo == NULL) {
 869                 DBG_DEBUG("%s is not a known TLN (DC)\n",
 870                           effective_domain);
 871                 TALLOC_FREE(trt);
 872                 return NT_STATUS_NOT_IMPLEMENTED;
 873         }
 874
 875         /*
 876          * We now about the domain...
 877          */
 878         TALLOC_FREE(trt);
 879         return NT_STATUS_OK;
 880 }
 881
 882 static NTSTATUS authsam_failtrusts_check_password(struct auth_method_context *ctx,
 883                                                   TALLOC_CTX *mem_ctx,
 884                                                   const struct auth_usersupplied_info *user_info,
 885                                                   struct auth_user_info_dc **user_info_dc)
 886 {
 887         /*
 888          * This should a good error for now,
 889          * until this module gets removed
 890          * and we have a full async path
 891          * to winbind.
 892          */
 893         return NT_STATUS_NO_TRUST_LSA_SECRET;
 894 }
 895
 896 /* Wrapper for the auth subsystem pointer */
 897 static NTSTATUS authsam_get_user_info_dc_principal_wrapper(TALLOC_CTX *mem_ctx,
 898                                                           struct auth4_context *auth_context,
 899                                                           const char *principal,
 900                                                           struct ldb_dn *user_dn,
 901                                                           struct auth_user_info_dc **user_info_dc)
 902 {
 903         return authsam_get_user_info_dc_principal(mem_ctx, auth_context->lp_ctx, auth_context->sam_ctx,
 904                                                  principal, user_dn, user_info_dc);
 905 }
 906 static const struct auth_operations sam_ignoredomain_ops = {
 907         .name                      = "sam_ignoredomain",
 908         .want_check                = authsam_ignoredomain_want_check,
 909         .check_password            = authsam_check_password_internals,
 910         .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper,
 911 };
 912
 913 static const struct auth_operations sam_ops = {
 914         .name                      = "sam",
 915         .want_check                = authsam_want_check,
 916         .check_password            = authsam_check_password_internals,
 917         .get_user_info_dc_principal = authsam_get_user_info_dc_principal_wrapper,
 918 };
 919
 920 static const struct auth_operations sam_failtrusts_ops = {
 921         .name                      = "sam_failtrusts",
 922         .want_check                = authsam_failtrusts_want_check,
 923         .check_password            = authsam_failtrusts_check_password,
 924 };
 925
 926 _PUBLIC_ NTSTATUS auth4_sam_init(void);
 927 _PUBLIC_ NTSTATUS auth4_sam_init(void)
 928 {
 929         NTSTATUS ret;
 930
 931         ret = auth_register(&sam_ops);
 932         if (!NT_STATUS_IS_OK(ret)) {
 933                 DEBUG(0,("Failed to register 'sam' auth backend!\n"));
 934                 return ret;
 935         }
 936
 937         ret = auth_register(&sam_ignoredomain_ops);
 938         if (!NT_STATUS_IS_OK(ret)) {
 939                 DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n"));
 940                 return ret;
 941         }
 942
 943         ret = auth_register(&sam_failtrusts_ops);
 944         if (!NT_STATUS_IS_OK(ret)) {
 945                 DEBUG(0,("Failed to register 'sam_failtrusts' auth backend!\n"));
 946                 return ret;
 947         }
 948
 949         return ret;
 950 }