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