source3/auth/pass_check.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password checking
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 /* this module is for checking a username/password against a system
  21    password database. The SMB encrypted password support is elsewhere */
  22
  23 #include "includes.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_AUTH
  27
  28 /* these are kept here to keep the string_combinations function simple */
  29 static char *ths_user;
  30
  31 static const char *get_this_user(void)
  32 {
  33         if (!ths_user) {
  34                 return "";
  35         }
  36         return ths_user;
  37 }
  38
  39 #if defined(WITH_PAM) || defined(OSF1_ENH_SEC)
  40 static const char *set_this_user(const char *newuser)
  41 {
  42         char *orig_user = ths_user;
  43         ths_user = SMB_STRDUP(newuser);
  44         SAFE_FREE(orig_user);
  45         return ths_user;
  46 }
  47 #endif
  48
  49 #if !defined(WITH_PAM)
  50 static char *ths_salt;
  51 /* This must be writable. */
  52 static char *get_this_salt(void)
  53 {
  54         return ths_salt;
  55 }
  56
  57 /* We may be setting a modified version of the same
  58  * string, so don't free before use. */
  59
  60 static const char *set_this_salt(const char *newsalt)
  61 {
  62         char *orig_salt = ths_salt;
  63         ths_salt = SMB_STRDUP(newsalt);
  64         SAFE_FREE(orig_salt);
  65         return ths_salt;
  66 }
  67
  68 static char *ths_crypted;
  69 static const char *get_this_crypted(void)
  70 {
  71         if (!ths_crypted) {
  72                 return "";
  73         }
  74         return ths_crypted;
  75 }
  76
  77 static const char *set_this_crypted(const char *newcrypted)
  78 {
  79         char *orig_crypted = ths_crypted;
  80         ths_crypted = SMB_STRDUP(newcrypted);
  81         SAFE_FREE(orig_crypted);
  82         return ths_crypted;
  83 }
  84 #endif
  85
  86 #ifdef WITH_AFS
  87
  88 #include <afs/stds.h>
  89 #include <afs/kautils.h>
  90
  91 /*******************************************************************
  92 check on AFS authentication
  93 ********************************************************************/
  94 static bool afs_auth(char *user, char *password)
  95 {
  96         long password_expires = 0;
  97         char *reason;
  98
  99         /* For versions of AFS prior to 3.3, this routine has few arguments, */
 100         /* but since I can't find the old documentation... :-)               */
 101         setpag();
 102         if (ka_UserAuthenticateGeneral
 103             (KA_USERAUTH_VERSION + KA_USERAUTH_DOSETPAG, user, (char *)0,       /* instance */
 104              (char *)0,         /* cell */
 105              password, 0,       /* lifetime, default */
 106              &password_expires, /*days 'til it expires */
 107              0,                 /* spare 2 */
 108              &reason) == 0)
 109         {
 110                 return (True);
 111         }
 112         DEBUG(1,
 113               ("AFS authentication for \"%s\" failed (%s)\n", user, reason));
 114         return (False);
 115 }
 116 #endif
 117
 118
 119 #ifdef WITH_DFS
 120
 121 #include <dce/dce_error.h>
 122 #include <dce/sec_login.h>
 123
 124 /*****************************************************************
 125  This new version of the DFS_AUTH code was donated by Karsten Muuss
 126  <muuss@or.uni-bonn.de>. It fixes the following problems with the
 127  old code :
 128
 129   - Server credentials may expire
 130   - Client credential cache files have wrong owner
 131   - purge_context() function is called with invalid argument
 132
 133  This new code was modified to ensure that on exit the uid/gid is
 134  still root, and the original directory is restored. JRA.
 135 ******************************************************************/
 136
 137 sec_login_handle_t my_dce_sec_context;
 138 int dcelogin_atmost_once = 0;
 139
 140 /*******************************************************************
 141 check on a DCE/DFS authentication
 142 ********************************************************************/
 143 static bool dfs_auth(char *user, char *password)
 144 {
 145         struct tm *t;
 146         error_status_t err;
 147         int err2;
 148         int prterr;
 149         signed32 expire_time, current_time;
 150         boolean32 password_reset;
 151         struct passwd *pw;
 152         sec_passwd_rec_t passwd_rec;
 153         sec_login_auth_src_t auth_src = sec_login_auth_src_network;
 154         unsigned char dce_errstr[dce_c_error_string_len];
 155         gid_t egid;
 156
 157         if (dcelogin_atmost_once)
 158                 return (False);
 159
 160 #ifdef HAVE_CRYPT
 161         /*
 162          * We only go for a DCE login context if the given password
 163          * matches that stored in the local password file..
 164          * Assumes local passwd file is kept in sync w/ DCE RGY!
 165          */
 166
 167         if (strcmp((char *)crypt(password, get_this_salt()), get_this_crypted()))
 168         {
 169                 return (False);
 170         }
 171 #endif
 172
 173         sec_login_get_current_context(&my_dce_sec_context, &err);
 174         if (err != error_status_ok)
 175         {
 176                 dce_error_inq_text(err, dce_errstr, &err2);
 177                 DEBUG(0, ("DCE can't get current context. %s\n", dce_errstr));
 178
 179                 return (False);
 180         }
 181
 182         sec_login_certify_identity(my_dce_sec_context, &err);
 183         if (err != error_status_ok)
 184         {
 185                 dce_error_inq_text(err, dce_errstr, &err2);
 186                 DEBUG(0, ("DCE can't get current context. %s\n", dce_errstr));
 187
 188                 return (False);
 189         }
 190
 191         sec_login_get_expiration(my_dce_sec_context, &expire_time, &err);
 192         if (err != error_status_ok)
 193         {
 194                 dce_error_inq_text(err, dce_errstr, &err2);
 195                 DEBUG(0, ("DCE can't get expiration. %s\n", dce_errstr));
 196
 197                 return (False);
 198         }
 199
 200         time(&current_time);
 201
 202         if (expire_time < (current_time + 60))
 203         {
 204                 struct passwd *pw;
 205                 sec_passwd_rec_t *key;
 206
 207                 sec_login_get_pwent(my_dce_sec_context,
 208                                     (sec_login_passwd_t *) & pw, &err);
 209                 if (err != error_status_ok)
 210                 {
 211                         dce_error_inq_text(err, dce_errstr, &err2);
 212                         DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr));
 213
 214                         return (False);
 215                 }
 216
 217                 sec_login_refresh_identity(my_dce_sec_context, &err);
 218                 if (err != error_status_ok)
 219                 {
 220                         dce_error_inq_text(err, dce_errstr, &err2);
 221                         DEBUG(0, ("DCE can't refresh identity. %s\n",
 222                                   dce_errstr));
 223
 224                         return (False);
 225                 }
 226
 227                 sec_key_mgmt_get_key(rpc_c_authn_dce_secret, NULL,
 228                                      (unsigned char *)pw->pw_name,
 229                                      sec_c_key_version_none,
 230                                      (void **)&key, &err);
 231                 if (err != error_status_ok)
 232                 {
 233                         dce_error_inq_text(err, dce_errstr, &err2);
 234                         DEBUG(0, ("DCE can't get key for %s. %s\n",
 235                                   pw->pw_name, dce_errstr));
 236
 237                         return (False);
 238                 }
 239
 240                 sec_login_valid_and_cert_ident(my_dce_sec_context, key,
 241                                                &password_reset, &auth_src,
 242                                                &err);
 243                 if (err != error_status_ok)
 244                 {
 245                         dce_error_inq_text(err, dce_errstr, &err2);
 246                         DEBUG(0,
 247                               ("DCE can't validate and certify identity for %s. %s\n",
 248                                pw->pw_name, dce_errstr));
 249                 }
 250
 251                 sec_key_mgmt_free_key(key, &err);
 252                 if (err != error_status_ok)
 253                 {
 254                         dce_error_inq_text(err, dce_errstr, &err2);
 255                         DEBUG(0, ("DCE can't free key.\n", dce_errstr));
 256                 }
 257         }
 258
 259         if (sec_login_setup_identity((unsigned char *)user,
 260                                      sec_login_no_flags,
 261                                      &my_dce_sec_context, &err) == 0)
 262         {
 263                 dce_error_inq_text(err, dce_errstr, &err2);
 264                 DEBUG(0, ("DCE Setup Identity for %s failed: %s\n",
 265                           user, dce_errstr));
 266                 return (False);
 267         }
 268
 269         sec_login_get_pwent(my_dce_sec_context,
 270                             (sec_login_passwd_t *) & pw, &err);
 271         if (err != error_status_ok)
 272         {
 273                 dce_error_inq_text(err, dce_errstr, &err2);
 274                 DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr));
 275
 276                 return (False);
 277         }
 278
 279         sec_login_purge_context(&my_dce_sec_context, &err);
 280         if (err != error_status_ok)
 281         {
 282                 dce_error_inq_text(err, dce_errstr, &err2);
 283                 DEBUG(0, ("DCE can't purge context. %s\n", dce_errstr));
 284
 285                 return (False);
 286         }
 287
 288         /*
 289          * NB. I'd like to change these to call something like change_to_user()
 290          * instead but currently we don't have a connection
 291          * context to become the correct user. This is already
 292          * fairly platform specific code however, so I think
 293          * this should be ok. I have added code to go
 294          * back to being root on error though. JRA.
 295          */
 296
 297         egid = getegid();
 298
 299         set_effective_gid(pw->pw_gid);
 300         set_effective_uid(pw->pw_uid);
 301
 302         if (sec_login_setup_identity((unsigned char *)user,
 303                                      sec_login_no_flags,
 304                                      &my_dce_sec_context, &err) == 0)
 305         {
 306                 dce_error_inq_text(err, dce_errstr, &err2);
 307                 DEBUG(0, ("DCE Setup Identity for %s failed: %s\n",
 308                           user, dce_errstr));
 309                 goto err;
 310         }
 311
 312         sec_login_get_pwent(my_dce_sec_context,
 313                             (sec_login_passwd_t *) & pw, &err);
 314         if (err != error_status_ok)
 315         {
 316                 dce_error_inq_text(err, dce_errstr, &err2);
 317                 DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr));
 318                 goto err;
 319         }
 320
 321         passwd_rec.version_number = sec_passwd_c_version_none;
 322         passwd_rec.pepper = NULL;
 323         passwd_rec.key.key_type = sec_passwd_plain;
 324         passwd_rec.key.tagged_union.plain = (idl_char *) password;
 325
 326         sec_login_validate_identity(my_dce_sec_context,
 327                                     &passwd_rec, &password_reset,
 328                                     &auth_src, &err);
 329         if (err != error_status_ok)
 330         {
 331                 dce_error_inq_text(err, dce_errstr, &err2);
 332                 DEBUG(0,
 333                       ("DCE Identity Validation failed for principal %s: %s\n",
 334                        user, dce_errstr));
 335                 goto err;
 336         }
 337
 338         sec_login_certify_identity(my_dce_sec_context, &err);
 339         if (err != error_status_ok)
 340         {
 341                 dce_error_inq_text(err, dce_errstr, &err2);
 342                 DEBUG(0, ("DCE certify identity failed: %s\n", dce_errstr));
 343                 goto err;
 344         }
 345
 346         if (auth_src != sec_login_auth_src_network)
 347         {
 348                 DEBUG(0, ("DCE context has no network credentials.\n"));
 349         }
 350
 351         sec_login_set_context(my_dce_sec_context, &err);
 352         if (err != error_status_ok)
 353         {
 354                 dce_error_inq_text(err, dce_errstr, &err2);
 355                 DEBUG(0,
 356                       ("DCE login failed for principal %s, cant set context: %s\n",
 357                        user, dce_errstr));
 358
 359                 sec_login_purge_context(&my_dce_sec_context, &err);
 360                 goto err;
 361         }
 362
 363         sec_login_get_pwent(my_dce_sec_context,
 364                             (sec_login_passwd_t *) & pw, &err);
 365         if (err != error_status_ok)
 366         {
 367                 dce_error_inq_text(err, dce_errstr, &err2);
 368                 DEBUG(0, ("DCE can't get pwent. %s\n", dce_errstr));
 369                 goto err;
 370         }
 371
 372         DEBUG(0, ("DCE login succeeded for principal %s on pid %d\n",
 373                   user, sys_getpid()));
 374
 375         DEBUG(3, ("DCE principal: %s\n"
 376                   "          uid: %d\n"
 377                   "          gid: %d\n",
 378                   pw->pw_name, pw->pw_uid, pw->pw_gid));
 379         DEBUG(3, ("         info: %s\n"
 380                   "          dir: %s\n"
 381                   "        shell: %s\n",
 382                   pw->pw_gecos, pw->pw_dir, pw->pw_shell));
 383
 384         sec_login_get_expiration(my_dce_sec_context, &expire_time, &err);
 385         if (err != error_status_ok)
 386         {
 387                 dce_error_inq_text(err, dce_errstr, &err2);
 388                 DEBUG(0, ("DCE can't get expiration. %s\n", dce_errstr));
 389                 goto err;
 390         }
 391
 392         set_effective_uid(0);
 393         set_effective_gid(0);
 394
 395         t = localtime(&expire_time);
 396         if (t) {
 397                 const char *asct = asctime(t);
 398                 if (asct) {
 399                         DEBUG(0,("DCE context expires: %s", asct));
 400                 }
 401         }
 402
 403         dcelogin_atmost_once = 1;
 404         return (True);
 405
 406       err:
 407
 408         /* Go back to root, JRA. */
 409         set_effective_uid(0);
 410         set_effective_gid(egid);
 411         return (False);
 412 }
 413
 414 void dfs_unlogin(void)
 415 {
 416         error_status_t err;
 417         int err2;
 418         unsigned char dce_errstr[dce_c_error_string_len];
 419
 420         sec_login_purge_context(&my_dce_sec_context, &err);
 421         if (err != error_status_ok)
 422         {
 423                 dce_error_inq_text(err, dce_errstr, &err2);
 424                 DEBUG(0,
 425                       ("DCE purge login context failed for server instance %d: %s\n",
 426                        sys_getpid(), dce_errstr));
 427         }
 428 }
 429 #endif
 430
 431 #ifdef LINUX_BIGCRYPT
 432 /****************************************************************************
 433 an enhanced crypt for Linux to handle password longer than 8 characters
 434 ****************************************************************************/
 435 static int linux_bigcrypt(char *password, char *salt1, char *crypted)
 436 {
 437 #define LINUX_PASSWORD_SEG_CHARS 8
 438         char salt[3];
 439         int i;
 440
 441         StrnCpy(salt, salt1, 2);
 442         crypted += 2;
 443
 444         for (i = strlen(password); i > 0; i -= LINUX_PASSWORD_SEG_CHARS) {
 445                 char *p = crypt(password, salt) + 2;
 446                 if (strncmp(p, crypted, LINUX_PASSWORD_SEG_CHARS) != 0)
 447                         return (0);
 448                 password += LINUX_PASSWORD_SEG_CHARS;
 449                 crypted += strlen(p);
 450         }
 451
 452         return (1);
 453 }
 454 #endif
 455
 456 #ifdef OSF1_ENH_SEC
 457 /****************************************************************************
 458 an enhanced crypt for OSF1
 459 ****************************************************************************/
 460 static char *osf1_bigcrypt(char *password, char *salt1)
 461 {
 462         static char result[AUTH_MAX_PASSWD_LENGTH] = "";
 463         char *p1;
 464         char *p2 = password;
 465         char salt[3];
 466         int i;
 467         int parts = strlen(password) / AUTH_CLEARTEXT_SEG_CHARS;
 468         if (strlen(password) % AUTH_CLEARTEXT_SEG_CHARS)
 469                 parts++;
 470
 471         StrnCpy(salt, salt1, 2);
 472         StrnCpy(result, salt1, 2);
 473         result[2] = '\0';
 474
 475         for (i = 0; i < parts; i++) {
 476                 p1 = crypt(p2, salt);
 477                 strncat(result, p1 + 2,
 478                         AUTH_MAX_PASSWD_LENGTH - strlen(p1 + 2) - 1);
 479                 StrnCpy(salt, &result[2 + i * AUTH_CIPHERTEXT_SEG_CHARS], 2);
 480                 p2 += AUTH_CLEARTEXT_SEG_CHARS;
 481         }
 482
 483         return (result);
 484 }
 485 #endif
 486
 487
 488 /****************************************************************************
 489 apply a function to upper/lower case combinations
 490 of a string and return true if one of them returns true.
 491 try all combinations with N uppercase letters.
 492 offset is the first char to try and change (start with 0)
 493 it assumes the string starts lowercased
 494 ****************************************************************************/
 495 static NTSTATUS string_combinations2(char *s, int offset,
 496                                      NTSTATUS (*fn)(const char *s,
 497                                                     void *private_data),
 498                                      int N, void *private_data)
 499 {
 500         int len = strlen(s);
 501         int i;
 502         NTSTATUS nt_status;
 503
 504 #ifdef PASSWORD_LENGTH
 505         len = MIN(len, PASSWORD_LENGTH);
 506 #endif
 507
 508         if (N <= 0 || offset >= len)
 509                 return (fn(s, private_data));
 510
 511         for (i = offset; i < (len - (N - 1)); i++) {
 512                 char c = s[i];
 513                 if (!islower_ascii(c))
 514                         continue;
 515                 s[i] = toupper_ascii(c);
 516                 nt_status = string_combinations2(s, i + 1, fn, N - 1,
 517                                                  private_data);
 518                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD)) {
 519                         return nt_status;
 520                 }
 521                 s[i] = c;
 522         }
 523         return (NT_STATUS_WRONG_PASSWORD);
 524 }
 525
 526 /****************************************************************************
 527 apply a function to upper/lower case combinations
 528 of a string and return true if one of them returns true.
 529 try all combinations with up to N uppercase letters.
 530 offset is the first char to try and change (start with 0)
 531 it assumes the string starts lowercased
 532 ****************************************************************************/
 533 static NTSTATUS string_combinations(char *s,
 534                                     NTSTATUS (*fn)(const char *s,
 535                                                    void *private_data),
 536                                     int N, void *private_data)
 537 {
 538         int n;
 539         NTSTATUS nt_status;
 540         for (n = 1; n <= N; n++) {
 541                 nt_status = string_combinations2(s, 0, fn, n, private_data);
 542                 if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD)) {
 543                         return nt_status;
 544                 }
 545         }
 546         return NT_STATUS_WRONG_PASSWORD;
 547 }
 548
 549
 550 /****************************************************************************
 551 core of password checking routine
 552 ****************************************************************************/
 553 static NTSTATUS password_check(const char *password, void *private_data)
 554 {
 555 #ifdef WITH_PAM
 556         const char *rhost = (const char *)private_data;
 557         return smb_pam_passcheck(get_this_user(), rhost, password);
 558 #else
 559
 560         bool ret;
 561
 562 #ifdef WITH_AFS
 563         if (afs_auth(get_this_user(), password))
 564                 return NT_STATUS_OK;
 565 #endif /* WITH_AFS */
 566
 567 #ifdef WITH_DFS
 568         if (dfs_auth(get_this_user(), password))
 569                 return NT_STATUS_OK;
 570 #endif /* WITH_DFS */
 571
 572 #ifdef OSF1_ENH_SEC
 573
 574         ret = (strcmp(osf1_bigcrypt(password, get_this_salt()),
 575                       get_this_crypted()) == 0);
 576         if (!ret) {
 577                 DEBUG(2,
 578                       ("OSF1_ENH_SEC failed. Trying normal crypt.\n"));
 579                 ret = (strcmp((char *)crypt(password, get_this_salt()), get_this_crypted()) == 0);
 580         }
 581         if (ret) {
 582                 return NT_STATUS_OK;
 583         } else {
 584                 return NT_STATUS_WRONG_PASSWORD;
 585         }
 586
 587 #endif /* OSF1_ENH_SEC */
 588
 589 #ifdef ULTRIX_AUTH
 590         ret = (strcmp((char *)crypt16(password, get_this_salt()), get_this_crypted()) == 0);
 591         if (ret) {
 592                 return NT_STATUS_OK;
 593         } else {
 594                 return NT_STATUS_WRONG_PASSWORD;
 595         }
 596
 597 #endif /* ULTRIX_AUTH */
 598
 599 #ifdef LINUX_BIGCRYPT
 600         ret = (linux_bigcrypt(password, get_this_salt(), get_this_crypted()));
 601         if (ret) {
 602                 return NT_STATUS_OK;
 603         } else {
 604                 return NT_STATUS_WRONG_PASSWORD;
 605         }
 606 #endif /* LINUX_BIGCRYPT */
 607
 608 #if defined(HAVE_BIGCRYPT) && defined(HAVE_CRYPT) && defined(USE_BOTH_CRYPT_CALLS)
 609
 610         /*
 611          * Some systems have bigcrypt in the C library but might not
 612          * actually use it for the password hashes (HPUX 10.20) is
 613          * a noteable example. So we try bigcrypt first, followed
 614          * by crypt.
 615          */
 616
 617         if (strcmp(bigcrypt(password, get_this_salt()), get_this_crypted()) == 0)
 618                 return NT_STATUS_OK;
 619         else
 620                 ret = (strcmp((char *)crypt(password, get_this_salt()), get_this_crypted()) == 0);
 621         if (ret) {
 622                 return NT_STATUS_OK;
 623         } else {
 624                 return NT_STATUS_WRONG_PASSWORD;
 625         }
 626 #else /* HAVE_BIGCRYPT && HAVE_CRYPT && USE_BOTH_CRYPT_CALLS */
 627
 628 #ifdef HAVE_BIGCRYPT
 629         ret = (strcmp(bigcrypt(password, get_this_salt()), get_this_crypted()) == 0);
 630         if (ret) {
 631                 return NT_STATUS_OK;
 632         } else {
 633                 return NT_STATUS_WRONG_PASSWORD;
 634         }
 635 #endif /* HAVE_BIGCRYPT */
 636
 637 #ifndef HAVE_CRYPT
 638         DEBUG(1, ("Warning - no crypt available\n"));
 639         return NT_STATUS_LOGON_FAILURE;
 640 #else /* HAVE_CRYPT */
 641         ret = (strcmp((char *)crypt(password, get_this_salt()), get_this_crypted()) == 0);
 642         if (ret) {
 643                 return NT_STATUS_OK;
 644         } else {
 645                 return NT_STATUS_WRONG_PASSWORD;
 646         }
 647 #endif /* HAVE_CRYPT */
 648 #endif /* HAVE_BIGCRYPT && HAVE_CRYPT && USE_BOTH_CRYPT_CALLS */
 649 #endif /* WITH_PAM */
 650 }
 651
 652
 653
 654 /****************************************************************************
 655 CHECK if a username/password is OK
 656 the function pointer fn() points to a function to call when a successful
 657 match is found and is used to update the encrypted password file
 658 return NT_STATUS_OK on correct match, appropriate error otherwise
 659 ****************************************************************************/
 660
 661 NTSTATUS pass_check(const struct passwd *pass,
 662                     const char *user,
 663                     const char *password,
 664                     bool run_cracker)
 665 {
 666         char *pass2 = NULL;
 667         int level = lp_passwordlevel();
 668
 669         NTSTATUS nt_status;
 670
 671         const char *rhost;
 672         char addr[INET6_ADDRSTRLEN];
 673
 674         rhost = client_name(smbd_server_fd());
 675         if (strequal(rhost,"UNKNOWN"))
 676                 rhost = client_addr(smbd_server_fd(), addr, sizeof(addr));
 677
 678 #ifdef DEBUG_PASSWORD
 679         DEBUG(100, ("checking user=[%s] pass=[%s]\n", user, password));
 680 #endif
 681
 682         if (!password)
 683                 return NT_STATUS_LOGON_FAILURE;
 684
 685         if ((!*password) && !lp_null_passwords())
 686                 return NT_STATUS_LOGON_FAILURE;
 687
 688 #if defined(WITH_PAM)
 689
 690         /*
 691          * If we're using PAM we want to short-circuit all the
 692          * checks below and dive straight into the PAM code.
 693          */
 694
 695         if (set_this_user(user) == NULL) {
 696                 return NT_STATUS_NO_MEMORY;
 697         }
 698
 699         DEBUG(4, ("pass_check: Checking (PAM) password for user %s\n", user));
 700
 701 #else /* Not using PAM */
 702
 703         DEBUG(4, ("pass_check: Checking password for user %s\n", user));
 704
 705         if (!pass) {
 706                 DEBUG(3, ("Couldn't find user %s\n", user));
 707                 return NT_STATUS_NO_SUCH_USER;
 708         }
 709
 710
 711         /* Copy into global for the convenience of looping code */
 712         /* Also the place to keep the 'password' no matter what
 713            crazy struct it started in... */
 714         if (set_this_crypted(pass->pw_passwd) == NULL) {
 715                 return NT_STATUS_NO_MEMORY;
 716         }
 717         if (set_this_salt(pass->pw_passwd) == NULL) {
 718                 return NT_STATUS_NO_MEMORY;
 719         }
 720
 721 #ifdef HAVE_GETSPNAM
 722         {
 723                 struct spwd *spass;
 724
 725                 /* many shadow systems require you to be root to get
 726                    the password, in most cases this should already be
 727                    the case when this function is called, except
 728                    perhaps for IPC password changing requests */
 729
 730                 spass = getspnam(pass->pw_name);
 731                 if (spass && spass->sp_pwdp) {
 732                         if (set_this_crypted(spass->sp_pwdp) == NULL) {
 733                                 return NT_STATUS_NO_MEMORY;
 734                         }
 735                         if (set_this_salt(spass->sp_pwdp) == NULL) {
 736                                 return NT_STATUS_NO_MEMORY;
 737                         }
 738                 }
 739         }
 740 #elif defined(IA_UINFO)
 741         {
 742                 /* Need to get password with SVR4.2's ia_ functions
 743                    instead of get{sp,pw}ent functions. Required by
 744                    UnixWare 2.x, tested on version
 745                    2.1. (tangent@cyberport.com) */
 746                 uinfo_t uinfo;
 747                 if (ia_openinfo(pass->pw_name, &uinfo) != -1)
 748                         ia_get_logpwd(uinfo, &(pass->pw_passwd));
 749         }
 750 #endif
 751
 752 #ifdef HAVE_GETPRPWNAM
 753         {
 754                 struct pr_passwd *pr_pw = getprpwnam(pass->pw_name);
 755                 if (pr_pw && pr_pw->ufld.fd_encrypt) {
 756                         if (set_this_crypted(pr_pw->ufld.fd_encrypt) == NULL) {
 757                                 return NT_STATUS_NO_MEMORY;
 758                         }
 759                 }
 760         }
 761 #endif
 762
 763 #ifdef HAVE_GETPWANAM
 764         {
 765                 struct passwd_adjunct *pwret;
 766                 pwret = getpwanam(s);
 767                 if (pwret && pwret->pwa_passwd) {
 768                         if (set_this_crypted(pwret->pwa_passwd) == NULL) {
 769                                 return NT_STATUS_NO_MEMORY;
 770                         }
 771                 }
 772         }
 773 #endif
 774
 775 #ifdef OSF1_ENH_SEC
 776         {
 777                 struct pr_passwd *mypasswd;
 778                 DEBUG(5, ("Checking password for user %s in OSF1_ENH_SEC\n",
 779                           user));
 780                 mypasswd = getprpwnam(user);
 781                 if (mypasswd) {
 782                         if (set_this_user(mypasswd->ufld.fd_name) == NULL) {
 783                                 return NT_STATUS_NO_MEMORY;
 784                         }
 785                         if (set_this_crypted(mypasswd->ufld.fd_encrypt) == NULL) {
 786                                 return NT_STATUS_NO_MEMORY;
 787                         }
 788                 } else {
 789                         DEBUG(5,
 790                               ("OSF1_ENH_SEC: No entry for user %s in protected database !\n",
 791                                user));
 792                 }
 793         }
 794 #endif
 795
 796 #ifdef ULTRIX_AUTH
 797         {
 798                 AUTHORIZATION *ap = getauthuid(pass->pw_uid);
 799                 if (ap) {
 800                         if (set_this_crypted(ap->a_password) == NULL) {
 801                                 endauthent();
 802                                 return NT_STATUS_NO_MEMORY;
 803                         }
 804                         endauthent();
 805                 }
 806         }
 807 #endif
 808
 809 #if defined(HAVE_TRUNCATED_SALT)
 810         /* crypt on some platforms (HPUX in particular)
 811            won't work with more than 2 salt characters. */
 812         {
 813                 char *trunc_salt = get_this_salt();
 814                 if (!trunc_salt || strlen(trunc_salt) < 2) {
 815                         return NT_STATUS_LOGON_FAILURE;
 816                 }
 817                 trunc_salt[2] = 0;
 818                 if (set_this_salt(trunc_salt) == NULL) {
 819                         return NT_STATUS_NO_MEMORY;
 820                 }
 821         }
 822 #endif
 823
 824         if (!get_this_crypted() || !*get_this_crypted()) {
 825                 if (!lp_null_passwords()) {
 826                         DEBUG(2, ("Disallowing %s with null password\n",
 827                                   get_this_user()));
 828                         return NT_STATUS_LOGON_FAILURE;
 829                 }
 830                 if (!*password) {
 831                         DEBUG(3,
 832                               ("Allowing access to %s with null password\n",
 833                                get_this_user()));
 834                         return NT_STATUS_OK;
 835                 }
 836         }
 837
 838 #endif /* defined(WITH_PAM) */
 839
 840         /* try it as it came to us */
 841         nt_status = password_check(password, (void *)rhost);
 842         if NT_STATUS_IS_OK(nt_status) {
 843                 return (nt_status);
 844         } else if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD)) {
 845                 /* No point continuing if its not the password thats to blame (ie PAM disabled). */
 846                 return (nt_status);
 847         }
 848
 849         if (!run_cracker) {
 850                 return (nt_status);
 851         }
 852
 853         /* if the password was given to us with mixed case then we don't
 854          * need to proceed as we know it hasn't been case modified by the
 855          * client */
 856         if (strhasupper(password) && strhaslower(password)) {
 857                 return nt_status;
 858         }
 859
 860         /* make a copy of it */
 861         pass2 = talloc_strdup(talloc_tos(), password);
 862         if (!pass2) {
 863                 return NT_STATUS_NO_MEMORY;
 864         }
 865
 866         /* try all lowercase if it's currently all uppercase */
 867         if (strhasupper(pass2)) {
 868                 strlower_m(pass2);
 869                 nt_status = password_check(pass2, (void *)rhost);
 870                 if (NT_STATUS_IS_OK(nt_status)) {
 871                         return (nt_status);
 872                 }
 873         }
 874
 875         /* give up? */
 876         if (level < 1) {
 877                 return NT_STATUS_WRONG_PASSWORD;
 878         }
 879
 880         /* last chance - all combinations of up to level chars upper! */
 881         strlower_m(pass2);
 882
 883         nt_status = string_combinations(pass2, password_check, level,
 884                                         (void *)rhost);
 885         if (NT_STATUS_IS_OK(nt_status)) {
 886                 return nt_status;
 887         }
 888
 889         return NT_STATUS_WRONG_PASSWORD;
 890 }