source/smbd/password.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22
  23 /* users from session setup */
  24 static char *session_userlist = NULL;
  25 /* workgroup from session setup. */
  26 static char *session_workgroup = NULL;
  27
  28 /* this holds info on user ids that are already validated for this VC */
  29 static user_struct *validated_users;
  30 static int next_vuid = VUID_OFFSET;
  31 static int num_validated_vuids;
  32
  33 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  34                                 SERVER_ALLOCATED_REQUIRED_NO,
  35                                 SERVER_ALLOCATED_REQUIRED_ANY};
  36
  37 static user_struct *get_valid_user_struct_internal(uint16 vuid,
  38                         enum server_allocated_state server_allocated)
  39 {
  40         user_struct *usp;
  41         int count=0;
  42
  43         if (vuid == UID_FIELD_INVALID)
  44                 return NULL;
  45
  46         for (usp=validated_users;usp;usp=usp->next,count++) {
  47                 if (vuid == usp->vuid) {
  48                         switch (server_allocated) {
  49                                 case SERVER_ALLOCATED_REQUIRED_YES:
  50                                         if (usp->server_info == NULL) {
  51                                                 continue;
  52                                         }
  53                                         break;
  54                                 case SERVER_ALLOCATED_REQUIRED_NO:
  55                                         if (usp->server_info != NULL) {
  56                                                 continue;
  57                                         }
  58                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  59                                         break;
  60                         }
  61                         if (count > 10) {
  62                                 DLIST_PROMOTE(validated_users, usp);
  63                         }
  64                         return usp;
  65                 }
  66         }
  67
  68         return NULL;
  69 }
  70
  71 /****************************************************************************
  72  Check if a uid has been validated, and return an pointer to the user_struct
  73  if it has. NULL if not. vuid is biased by an offset. This allows us to
  74  tell random client vuid's (normally zero) from valid vuids.
  75 ****************************************************************************/
  76
  77 user_struct *get_valid_user_struct(uint16 vuid)
  78 {
  79         return get_valid_user_struct_internal(vuid,
  80                         SERVER_ALLOCATED_REQUIRED_YES);
  81 }
  82
  83 bool is_partial_auth_vuid(uint16 vuid)
  84 {
  85         if (vuid == UID_FIELD_INVALID) {
  86                 return False;
  87         }
  88         return get_valid_user_struct_internal(vuid,
  89                         SERVER_ALLOCATED_REQUIRED_NO) ? True : False;
  90 }
  91
  92 /****************************************************************************
  93  Get the user struct of a partial NTLMSSP login
  94 ****************************************************************************/
  95
  96 user_struct *get_partial_auth_user_struct(uint16 vuid)
  97 {
  98         return get_valid_user_struct_internal(vuid,
  99                         SERVER_ALLOCATED_REQUIRED_NO);
 100 }
 101
 102 /****************************************************************************
 103  Invalidate a uid.
 104 ****************************************************************************/
 105
 106 void invalidate_vuid(uint16 vuid)
 107 {
 108         user_struct *vuser = NULL;
 109
 110         if (vuid == UID_FIELD_INVALID) {
 111                 return;
 112         }
 113
 114         vuser = get_valid_user_struct_internal(vuid,
 115                         SERVER_ALLOCATED_REQUIRED_ANY);
 116         if (vuser == NULL) {
 117                 return;
 118         }
 119
 120         session_yield(vuser);
 121
 122         if (vuser->auth_ntlmssp_state) {
 123                 auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
 124         }
 125
 126         DLIST_REMOVE(validated_users, vuser);
 127
 128         /* clear the vuid from the 'cache' on each connection, and
 129            from the vuid 'owner' of connections */
 130         conn_clear_vuid_cache(vuid);
 131
 132         TALLOC_FREE(vuser);
 133         num_validated_vuids--;
 134 }
 135
 136 /****************************************************************************
 137  Invalidate all vuid entries for this process.
 138 ****************************************************************************/
 139
 140 void invalidate_all_vuids(void)
 141 {
 142         user_struct *usp, *next=NULL;
 143
 144         for (usp=validated_users;usp;usp=next) {
 145                 next = usp->next;
 146                 invalidate_vuid(usp->vuid);
 147         }
 148 }
 149
 150 /****************************************************
 151  Create a new partial auth user struct.
 152 *****************************************************/
 153
 154 int register_initial_vuid(void)
 155 {
 156         user_struct *vuser;
 157
 158         /* Paranoia check. */
 159         if(lp_security() == SEC_SHARE) {
 160                 smb_panic("register_initial_vuid: "
 161                         "Tried to register uid in security=share");
 162         }
 163
 164         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 165         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 166                 return UID_FIELD_INVALID;
 167         }
 168
 169         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 170                 DEBUG(0,("register_initial_vuid: "
 171                                 "Failed to talloc users struct!\n"));
 172                 return UID_FIELD_INVALID;
 173         }
 174
 175         /* Allocate a free vuid. Yes this is a linear search... */
 176         while( get_valid_user_struct_internal(next_vuid,
 177                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 178                 next_vuid++;
 179                 /* Check for vuid wrap. */
 180                 if (next_vuid == UID_FIELD_INVALID) {
 181                         next_vuid = VUID_OFFSET;
 182                 }
 183         }
 184
 185         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 186                 (unsigned int)next_vuid ));
 187
 188         vuser->vuid = next_vuid;
 189
 190         /*
 191          * This happens in an unfinished NTLMSSP session setup. We
 192          * need to allocate a vuid between the first and second calls
 193          * to NTLMSSP.
 194          */
 195         next_vuid++;
 196         num_validated_vuids++;
 197
 198         DLIST_ADD(validated_users, vuser);
 199         return vuser->vuid;
 200 }
 201
 202 static int register_homes_share(const char *username)
 203 {
 204         int result;
 205         struct passwd *pwd;
 206
 207         result = lp_servicenumber(username);
 208         if (result != -1) {
 209                 DEBUG(3, ("Using static (or previously created) service for "
 210                           "user '%s'; path = '%s'\n", username,
 211                           lp_pathname(result)));
 212                 return result;
 213         }
 214
 215         pwd = getpwnam_alloc(talloc_tos(), username);
 216
 217         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 218                 DEBUG(3, ("No home directory defined for user '%s'\n",
 219                           username));
 220                 TALLOC_FREE(pwd);
 221                 return -1;
 222         }
 223
 224         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 225                   "'%s'\n", username, pwd->pw_dir));
 226
 227         result = add_home_service(username, username, pwd->pw_dir);
 228
 229         TALLOC_FREE(pwd);
 230         return result;
 231 }
 232
 233 /**
 234  *  register that a valid login has been performed, establish 'session'.
 235  *  @param server_info The token returned from the authentication process.
 236  *   (now 'owned' by register_existing_vuid)
 237  *
 238  *  @param session_key The User session key for the login session (now also
 239  *  'owned' by register_existing_vuid)
 240  *
 241  *  @param respose_blob The NT challenge-response, if available.  (May be
 242  *  freed after this call)
 243  *
 244  *  @param smb_name The untranslated name of the user
 245  *
 246  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 247  *   tell random client vuid's (normally zero) from valid vuids.)
 248  *
 249  */
 250
 251 int register_existing_vuid(uint16 vuid,
 252                         auth_serversupplied_info *server_info,
 253                         DATA_BLOB response_blob,
 254                         const char *smb_name)
 255 {
 256         user_struct *vuser = get_partial_auth_user_struct(vuid);
 257         if (!vuser) {
 258                 goto fail;
 259         }
 260
 261         /* Use this to keep tabs on all our info from the authentication */
 262         vuser->server_info = server_info;
 263
 264         /* Ensure that the server_info will disappear with
 265          * the vuser it is now attached to */
 266
 267         talloc_steal(vuser, vuser->server_info);
 268
 269         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 270
 271         /* This is a potentially untrusted username */
 272         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 273                 sizeof(vuser->user.smb_name));
 274
 275         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 276         fstrcpy(vuser->user.full_name,
 277         pdb_get_fullname(server_info->sam_account));
 278
 279         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 280                         (unsigned int)vuser->server_info->uid,
 281                         (unsigned int)vuser->server_info->gid,
 282                         vuser->user.unix_name, vuser->user.smb_name,
 283                         vuser->user.domain, vuser->server_info->guest ));
 284
 285         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 286                 "Real name: %s\n", vuser->user.unix_name,
 287                 vuser->user.full_name));
 288
 289         if (!server_info->ptok) {
 290                 DEBUG(1, ("register_existing_vuid: server_info does not "
 291                         "contain a user_token - cannot continue\n"));
 292                 goto fail;
 293         }
 294
 295         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 296                 "and will be vuid %u\n", (int)vuser->server_info->uid,
 297                  vuser->user.unix_name, vuser->vuid));
 298
 299         next_vuid++;
 300         num_validated_vuids++;
 301
 302         if (!session_claim(vuser)) {
 303                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 304                         "for vuid=%d\n",
 305                         vuser->vuid));
 306                 goto fail;
 307         }
 308
 309         /* Register a home dir service for this user if
 310         (a) This is not a guest connection,
 311         (b) we have a home directory defined
 312         (c) there s not an existing static share by that name
 313         If a share exists by this name (autoloaded or not) reuse it . */
 314
 315         vuser->homes_snum = -1;
 316
 317         if (!vuser->server_info->guest) {
 318                 vuser->homes_snum = register_homes_share(
 319                         vuser->user.unix_name);
 320         }
 321
 322         if (srv_is_signing_negotiated() && !vuser->server_info->guest &&
 323                         !srv_signing_started()) {
 324                 /* Try and turn on server signing on the first non-guest
 325                  * sessionsetup. */
 326                 srv_set_signing(vuser->server_info->user_session_key, response_blob);
 327         }
 328
 329         /* fill in the current_user_info struct */
 330         set_current_user_info( &vuser->user );
 331         return vuser->vuid;
 332
 333   fail:
 334
 335         if (vuser) {
 336                 invalidate_vuid(vuid);
 337         }
 338         return UID_FIELD_INVALID;
 339 }
 340
 341 /****************************************************************************
 342  Add a name to the session users list.
 343 ****************************************************************************/
 344
 345 void add_session_user(const char *user)
 346 {
 347         struct passwd *pw;
 348         char *tmp;
 349
 350         pw = Get_Pwnam_alloc(talloc_tos(), user);
 351
 352         if (pw == NULL) {
 353                 return;
 354         }
 355
 356         if (session_userlist == NULL) {
 357                 session_userlist = SMB_STRDUP(pw->pw_name);
 358                 goto done;
 359         }
 360
 361         if (in_list(pw->pw_name,session_userlist,False) ) {
 362                 goto done;
 363         }
 364
 365         if (strlen(session_userlist) > 128 * 1024) {
 366                 DEBUG(3,("add_session_user: session userlist already "
 367                          "too large.\n"));
 368                 goto done;
 369         }
 370
 371         if (asprintf(&tmp, "%s %s", session_userlist, pw->pw_name) == -1) {
 372                 DEBUG(3, ("asprintf failed\n"));
 373                 goto done;
 374         }
 375
 376         SAFE_FREE(session_userlist);
 377         session_userlist = tmp;
 378  done:
 379         TALLOC_FREE(pw);
 380 }
 381
 382 /****************************************************************************
 383  In security=share mode we need to store the client workgroup, as that's
 384   what Vista uses for the NTLMv2 calculation.
 385 ****************************************************************************/
 386
 387 void add_session_workgroup(const char *workgroup)
 388 {
 389         if (session_workgroup) {
 390                 SAFE_FREE(session_workgroup);
 391         }
 392         session_workgroup = smb_xstrdup(workgroup);
 393 }
 394
 395 /****************************************************************************
 396  In security=share mode we need to return the client workgroup, as that's
 397   what Vista uses for the NTLMv2 calculation.
 398 ****************************************************************************/
 399
 400 const char *get_session_workgroup(void)
 401 {
 402         return session_workgroup;
 403 }
 404
 405 /****************************************************************************
 406  Check if a user is in a netgroup user list. If at first we don't succeed,
 407  try lower case.
 408 ****************************************************************************/
 409
 410 bool user_in_netgroup(const char *user, const char *ngname)
 411 {
 412 #ifdef HAVE_NETGROUP
 413         static char *mydomain = NULL;
 414         fstring lowercase_user;
 415
 416         if (mydomain == NULL)
 417                 yp_get_default_domain(&mydomain);
 418
 419         if(mydomain == NULL) {
 420                 DEBUG(5,("Unable to get default yp domain, "
 421                         "let's try without specifying it\n"));
 422         }
 423
 424         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 425                 user, mydomain?mydomain:"(ANY)", ngname));
 426
 427         if (innetgr(ngname, NULL, user, mydomain)) {
 428                 DEBUG(5,("user_in_netgroup: Found\n"));
 429                 return (True);
 430         } else {
 431
 432                 /*
 433                  * Ok, innetgr is case sensitive. Try once more with lowercase
 434                  * just in case. Attempt to fix #703. JRA.
 435                  */
 436
 437                 fstrcpy(lowercase_user, user);
 438                 strlower_m(lowercase_user);
 439
 440                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 441                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 442
 443                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 444                         DEBUG(5,("user_in_netgroup: Found\n"));
 445                         return (True);
 446                 }
 447         }
 448 #endif /* HAVE_NETGROUP */
 449         return False;
 450 }
 451
 452 /****************************************************************************
 453  Check if a user is in a user list - can check combinations of UNIX
 454  and netgroup lists.
 455 ****************************************************************************/
 456
 457 bool user_in_list(const char *user,const char **list)
 458 {
 459         if (!list || !*list)
 460                 return False;
 461
 462         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 463
 464         while (*list) {
 465
 466                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 467                           user, *list));
 468
 469                 /*
 470                  * Check raw username.
 471                  */
 472                 if (strequal(user, *list))
 473                         return(True);
 474
 475                 /*
 476                  * Now check to see if any combination
 477                  * of UNIX and netgroups has been specified.
 478                  */
 479
 480                 if(**list == '@') {
 481                         /*
 482                          * Old behaviour. Check netgroup list
 483                          * followed by UNIX list.
 484                          */
 485                         if(user_in_netgroup(user, *list +1))
 486                                 return True;
 487                         if(user_in_group(user, *list +1))
 488                                 return True;
 489                 } else if (**list == '+') {
 490
 491                         if((*(*list +1)) == '&') {
 492                                 /*
 493                                  * Search UNIX list followed by netgroup.
 494                                  */
 495                                 if(user_in_group(user, *list +2))
 496                                         return True;
 497                                 if(user_in_netgroup(user, *list +2))
 498                                         return True;
 499
 500                         } else {
 501
 502                                 /*
 503                                  * Just search UNIX list.
 504                                  */
 505
 506                                 if(user_in_group(user, *list +1))
 507                                         return True;
 508                         }
 509
 510                 } else if (**list == '&') {
 511
 512                         if(*(*list +1) == '+') {
 513                                 /*
 514                                  * Search netgroup list followed by UNIX list.
 515                                  */
 516                                 if(user_in_netgroup(user, *list +2))
 517                                         return True;
 518                                 if(user_in_group(user, *list +2))
 519                                         return True;
 520                         } else {
 521                                 /*
 522                                  * Just search netgroup list.
 523                                  */
 524                                 if(user_in_netgroup(user, *list +1))
 525                                         return True;
 526                         }
 527                 }
 528
 529                 list++;
 530         }
 531         return(False);
 532 }
 533
 534 /****************************************************************************
 535  Check if a username is valid.
 536 ****************************************************************************/
 537
 538 static bool user_ok(const char *user, int snum)
 539 {
 540         char **valid, **invalid;
 541         bool ret;
 542
 543         valid = invalid = NULL;
 544         ret = True;
 545
 546         if (lp_invalid_users(snum)) {
 547                 str_list_copy(talloc_tos(), &invalid, lp_invalid_users(snum));
 548                 if (invalid &&
 549                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 550
 551                         /* This is used in sec=share only, so no current user
 552                          * around to pass to str_list_sub_basic() */
 553
 554                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 555                                 ret = !user_in_list(user,
 556                                                     (const char **)invalid);
 557                         }
 558                 }
 559         }
 560         TALLOC_FREE(invalid);
 561
 562         if (ret && lp_valid_users(snum)) {
 563                 str_list_copy(talloc_tos(), &valid, lp_valid_users(snum));
 564                 if ( valid &&
 565                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 566
 567                         /* This is used in sec=share only, so no current user
 568                          * around to pass to str_list_sub_basic() */
 569
 570                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 571                                 ret = user_in_list(user, (const char **)valid);
 572                         }
 573                 }
 574         }
 575         TALLOC_FREE(valid);
 576
 577         if (ret && lp_onlyuser(snum)) {
 578                 char **user_list = str_list_make(
 579                         talloc_tos(), lp_username(snum), NULL);
 580                 if (user_list &&
 581                     str_list_substitute(user_list, "%S",
 582                                         lp_servicename(snum))) {
 583                         ret = user_in_list(user, (const char **)user_list);
 584                 }
 585                 TALLOC_FREE(user_list);
 586         }
 587
 588         return(ret);
 589 }
 590
 591 /****************************************************************************
 592  Validate a group username entry. Return the username or NULL.
 593 ****************************************************************************/
 594
 595 static char *validate_group(char *group, DATA_BLOB password,int snum)
 596 {
 597 #ifdef HAVE_NETGROUP
 598         {
 599                 char *host, *user, *domain;
 600                 setnetgrent(group);
 601                 while (getnetgrent(&host, &user, &domain)) {
 602                         if (user) {
 603                                 if (user_ok(user, snum) &&
 604                                     password_ok(user,password)) {
 605                                         endnetgrent();
 606                                         return(user);
 607                                 }
 608                         }
 609                 }
 610                 endnetgrent();
 611         }
 612 #endif
 613
 614 #ifdef HAVE_GETGRENT
 615         {
 616                 struct group *gptr;
 617                 setgrent();
 618                 while ((gptr = (struct group *)getgrent())) {
 619                         if (strequal(gptr->gr_name,group))
 620                                 break;
 621                 }
 622
 623                 /*
 624                  * As user_ok can recurse doing a getgrent(), we must
 625                  * copy the member list onto the heap before
 626                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 627                  */
 628
 629                 if (gptr) {
 630                         char *member_list = NULL;
 631                         size_t list_len = 0;
 632                         char *member;
 633                         int i;
 634
 635                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 636                                 list_len += strlen(gptr->gr_mem[i])+1;
 637                         }
 638                         list_len++;
 639
 640                         member_list = (char *)SMB_MALLOC(list_len);
 641                         if (!member_list) {
 642                                 endgrent();
 643                                 return NULL;
 644                         }
 645
 646                         *member_list = '\0';
 647                         member = member_list;
 648
 649                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 650                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 651
 652                                 DEBUG(10,("validate_group: = gr_mem = "
 653                                           "%s\n", gptr->gr_mem[i]));
 654
 655                                 safe_strcpy(member, gptr->gr_mem[i],
 656                                         list_len - (member-member_list));
 657                                 member += member_len;
 658                         }
 659
 660                         endgrent();
 661
 662                         member = member_list;
 663                         while (*member) {
 664                                 if (user_ok(member,snum) &&
 665                                     password_ok(member,password)) {
 666                                         char *name = talloc_strdup(talloc_tos(),
 667                                                                 member);
 668                                         SAFE_FREE(member_list);
 669                                         return name;
 670                                 }
 671
 672                                 DEBUG(10,("validate_group = member = %s\n",
 673                                           member));
 674
 675                                 member += strlen(member) + 1;
 676                         }
 677
 678                         SAFE_FREE(member_list);
 679                 } else {
 680                         endgrent();
 681                         return NULL;
 682                 }
 683         }
 684 #endif
 685         return(NULL);
 686 }
 687
 688 /****************************************************************************
 689  Check for authority to login to a service with a given username/password.
 690  Note this is *NOT* used when logging on using sessionsetup_and_X.
 691 ****************************************************************************/
 692
 693 bool authorise_login(int snum, fstring user, DATA_BLOB password,
 694                      bool *guest)
 695 {
 696         bool ok = False;
 697
 698 #ifdef DEBUG_PASSWORD
 699         DEBUG(100,("authorise_login: checking authorisation on "
 700                    "user=%s pass=%s\n", user,password.data));
 701 #endif
 702
 703         *guest = False;
 704
 705         /* there are several possibilities:
 706                 1) login as the given user with given password
 707                 2) login as a previously registered username with the given
 708                    password
 709                 3) login as a session list username with the given password
 710                 4) login as a previously validated user/password pair
 711                 5) login as the "user =" user with given password
 712                 6) login as the "user =" user with no password
 713                    (guest connection)
 714                 7) login as guest user with no password
 715
 716                 if the service is guest_only then steps 1 to 5 are skipped
 717         */
 718
 719         /* now check the list of session users */
 720         if (!ok) {
 721                 char *auser;
 722                 char *user_list = NULL;
 723                 char *saveptr;
 724
 725                 if ( session_userlist )
 726                         user_list = SMB_STRDUP(session_userlist);
 727                 else
 728                         user_list = SMB_STRDUP("");
 729
 730                 if (!user_list)
 731                         return(False);
 732
 733                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 734                      !ok && auser;
 735                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 736                         fstring user2;
 737                         fstrcpy(user2,auser);
 738                         if (!user_ok(user2,snum))
 739                                 continue;
 740
 741                         if (password_ok(user2,password)) {
 742                                 ok = True;
 743                                 fstrcpy(user,user2);
 744                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 745                                          "list username (%s) and given "
 746                                          "password ok\n", user));
 747                         }
 748                 }
 749
 750                 SAFE_FREE(user_list);
 751         }
 752
 753         /* check the user= fields and the given password */
 754         if (!ok && lp_username(snum)) {
 755                 TALLOC_CTX *ctx = talloc_tos();
 756                 char *auser;
 757                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 758                 char *saveptr;
 759
 760                 if (!user_list) {
 761                         goto check_guest;
 762                 }
 763
 764                 user_list = talloc_string_sub(ctx,
 765                                 user_list,
 766                                 "%S",
 767                                 lp_servicename(snum));
 768
 769                 if (!user_list) {
 770                         goto check_guest;
 771                 }
 772
 773                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 774                      auser && !ok;
 775                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 776                         if (*auser == '@') {
 777                                 auser = validate_group(auser+1,password,snum);
 778                                 if (auser) {
 779                                         ok = True;
 780                                         fstrcpy(user,auser);
 781                                         DEBUG(3,("authorise_login: ACCEPTED: "
 782                                                  "group username and given "
 783                                                  "password ok (%s)\n", user));
 784                                 }
 785                         } else {
 786                                 fstring user2;
 787                                 fstrcpy(user2,auser);
 788                                 if (user_ok(user2,snum) &&
 789                                     password_ok(user2,password)) {
 790                                         ok = True;
 791                                         fstrcpy(user,user2);
 792                                         DEBUG(3,("authorise_login: ACCEPTED: "
 793                                                  "user list username and "
 794                                                  "given password ok (%s)\n",
 795                                                  user));
 796                                 }
 797                         }
 798                 }
 799         }
 800
 801   check_guest:
 802
 803         /* check for a normal guest connection */
 804         if (!ok && GUEST_OK(snum)) {
 805                 struct passwd *guest_pw;
 806                 fstring guestname;
 807                 fstrcpy(guestname,lp_guestaccount());
 808                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 809                 if (guest_pw != NULL) {
 810                         fstrcpy(user,guestname);
 811                         ok = True;
 812                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 813                                  "and guest ok (%s)\n", user));
 814                 } else {
 815                         DEBUG(0,("authorise_login: Invalid guest account "
 816                                  "%s??\n",guestname));
 817                 }
 818                 TALLOC_FREE(guest_pw);
 819                 *guest = True;
 820         }
 821
 822         if (ok && !user_ok(user, snum)) {
 823                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 824                 ok = False;
 825         }
 826
 827         return(ok);
 828 }