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_caches(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         fstring tmp;
 257         user_struct *vuser;
 258
 259         vuser = get_partial_auth_user_struct(vuid);
 260         if (!vuser) {
 261                 goto fail;
 262         }
 263
 264         /* Use this to keep tabs on all our info from the authentication */
 265         vuser->server_info = talloc_move(vuser, &server_info);
 266
 267         /* This is a potentially untrusted username */
 268         alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
 269
 270         vuser->server_info->sanitized_username = talloc_strdup(
 271                 vuser->server_info, tmp);
 272
 273         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 274                   (unsigned int)vuser->server_info->utok.uid,
 275                   (unsigned int)vuser->server_info->utok.gid,
 276                   vuser->server_info->unix_name,
 277                   vuser->server_info->sanitized_username,
 278                   pdb_get_domain(vuser->server_info->sam_account),
 279                   vuser->server_info->guest ));
 280
 281         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 282                   "Real name: %s\n", vuser->server_info->unix_name,
 283                   pdb_get_fullname(vuser->server_info->sam_account)));
 284
 285         if (!vuser->server_info->ptok) {
 286                 DEBUG(1, ("register_existing_vuid: server_info does not "
 287                         "contain a user_token - cannot continue\n"));
 288                 goto fail;
 289         }
 290
 291         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 292                 "and will be vuid %u\n", (int)vuser->server_info->utok.uid,
 293                  vuser->server_info->unix_name, vuser->vuid));
 294
 295         next_vuid++;
 296         num_validated_vuids++;
 297
 298         if (!session_claim(vuser)) {
 299                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 300                         "for vuid=%d\n",
 301                         vuser->vuid));
 302                 goto fail;
 303         }
 304
 305         /* Register a home dir service for this user if
 306         (a) This is not a guest connection,
 307         (b) we have a home directory defined
 308         (c) there s not an existing static share by that name
 309         If a share exists by this name (autoloaded or not) reuse it . */
 310
 311         vuser->homes_snum = -1;
 312
 313         if (!vuser->server_info->guest) {
 314                 vuser->homes_snum = register_homes_share(
 315                         vuser->server_info->unix_name);
 316         }
 317
 318         if (srv_is_signing_negotiated() && !vuser->server_info->guest &&
 319                         !srv_signing_started()) {
 320                 /* Try and turn on server signing on the first non-guest
 321                  * sessionsetup. */
 322                 srv_set_signing(vuser->server_info->user_session_key, response_blob);
 323         }
 324
 325         /* fill in the current_user_info struct */
 326         set_current_user_info(
 327                 vuser->server_info->sanitized_username,
 328                 vuser->server_info->unix_name,
 329                 pdb_get_fullname(vuser->server_info->sam_account),
 330                 pdb_get_domain(vuser->server_info->sam_account));
 331
 332         return vuser->vuid;
 333
 334   fail:
 335
 336         if (vuser) {
 337                 invalidate_vuid(vuid);
 338         }
 339         return UID_FIELD_INVALID;
 340 }
 341
 342 /****************************************************************************
 343  Add a name to the session users list.
 344 ****************************************************************************/
 345
 346 void add_session_user(const char *user)
 347 {
 348         struct passwd *pw;
 349         char *tmp;
 350
 351         pw = Get_Pwnam_alloc(talloc_tos(), user);
 352
 353         if (pw == NULL) {
 354                 return;
 355         }
 356
 357         if (session_userlist == NULL) {
 358                 session_userlist = SMB_STRDUP(pw->pw_name);
 359                 goto done;
 360         }
 361
 362         if (in_list(pw->pw_name,session_userlist,False) ) {
 363                 goto done;
 364         }
 365
 366         if (strlen(session_userlist) > 128 * 1024) {
 367                 DEBUG(3,("add_session_user: session userlist already "
 368                          "too large.\n"));
 369                 goto done;
 370         }
 371
 372         if (asprintf(&tmp, "%s %s", session_userlist, pw->pw_name) == -1) {
 373                 DEBUG(3, ("asprintf failed\n"));
 374                 goto done;
 375         }
 376
 377         SAFE_FREE(session_userlist);
 378         session_userlist = tmp;
 379  done:
 380         TALLOC_FREE(pw);
 381 }
 382
 383 /****************************************************************************
 384  In security=share mode we need to store the client workgroup, as that's
 385   what Vista uses for the NTLMv2 calculation.
 386 ****************************************************************************/
 387
 388 void add_session_workgroup(const char *workgroup)
 389 {
 390         if (session_workgroup) {
 391                 SAFE_FREE(session_workgroup);
 392         }
 393         session_workgroup = smb_xstrdup(workgroup);
 394 }
 395
 396 /****************************************************************************
 397  In security=share mode we need to return the client workgroup, as that's
 398   what Vista uses for the NTLMv2 calculation.
 399 ****************************************************************************/
 400
 401 const char *get_session_workgroup(void)
 402 {
 403         return session_workgroup;
 404 }
 405
 406 /****************************************************************************
 407  Check if a user is in a netgroup user list. If at first we don't succeed,
 408  try lower case.
 409 ****************************************************************************/
 410
 411 bool user_in_netgroup(const char *user, const char *ngname)
 412 {
 413 #ifdef HAVE_NETGROUP
 414         static char *mydomain = NULL;
 415         fstring lowercase_user;
 416
 417         if (mydomain == NULL)
 418                 yp_get_default_domain(&mydomain);
 419
 420         if(mydomain == NULL) {
 421                 DEBUG(5,("Unable to get default yp domain, "
 422                         "let's try without specifying it\n"));
 423         }
 424
 425         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 426                 user, mydomain?mydomain:"(ANY)", ngname));
 427
 428         if (innetgr(ngname, NULL, user, mydomain)) {
 429                 DEBUG(5,("user_in_netgroup: Found\n"));
 430                 return (True);
 431         } else {
 432
 433                 /*
 434                  * Ok, innetgr is case sensitive. Try once more with lowercase
 435                  * just in case. Attempt to fix #703. JRA.
 436                  */
 437
 438                 fstrcpy(lowercase_user, user);
 439                 strlower_m(lowercase_user);
 440
 441                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 442                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 443
 444                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 445                         DEBUG(5,("user_in_netgroup: Found\n"));
 446                         return (True);
 447                 }
 448         }
 449 #endif /* HAVE_NETGROUP */
 450         return False;
 451 }
 452
 453 /****************************************************************************
 454  Check if a user is in a user list - can check combinations of UNIX
 455  and netgroup lists.
 456 ****************************************************************************/
 457
 458 bool user_in_list(const char *user,const char **list)
 459 {
 460         if (!list || !*list)
 461                 return False;
 462
 463         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 464
 465         while (*list) {
 466
 467                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 468                           user, *list));
 469
 470                 /*
 471                  * Check raw username.
 472                  */
 473                 if (strequal(user, *list))
 474                         return(True);
 475
 476                 /*
 477                  * Now check to see if any combination
 478                  * of UNIX and netgroups has been specified.
 479                  */
 480
 481                 if(**list == '@') {
 482                         /*
 483                          * Old behaviour. Check netgroup list
 484                          * followed by UNIX list.
 485                          */
 486                         if(user_in_netgroup(user, *list +1))
 487                                 return True;
 488                         if(user_in_group(user, *list +1))
 489                                 return True;
 490                 } else if (**list == '+') {
 491
 492                         if((*(*list +1)) == '&') {
 493                                 /*
 494                                  * Search UNIX list followed by netgroup.
 495                                  */
 496                                 if(user_in_group(user, *list +2))
 497                                         return True;
 498                                 if(user_in_netgroup(user, *list +2))
 499                                         return True;
 500
 501                         } else {
 502
 503                                 /*
 504                                  * Just search UNIX list.
 505                                  */
 506
 507                                 if(user_in_group(user, *list +1))
 508                                         return True;
 509                         }
 510
 511                 } else if (**list == '&') {
 512
 513                         if(*(*list +1) == '+') {
 514                                 /*
 515                                  * Search netgroup list followed by UNIX list.
 516                                  */
 517                                 if(user_in_netgroup(user, *list +2))
 518                                         return True;
 519                                 if(user_in_group(user, *list +2))
 520                                         return True;
 521                         } else {
 522                                 /*
 523                                  * Just search netgroup list.
 524                                  */
 525                                 if(user_in_netgroup(user, *list +1))
 526                                         return True;
 527                         }
 528                 }
 529
 530                 list++;
 531         }
 532         return(False);
 533 }
 534
 535 /****************************************************************************
 536  Check if a username is valid.
 537 ****************************************************************************/
 538
 539 static bool user_ok(const char *user, int snum)
 540 {
 541         char **valid, **invalid;
 542         bool ret;
 543
 544         valid = invalid = NULL;
 545         ret = True;
 546
 547         if (lp_invalid_users(snum)) {
 548                 str_list_copy(talloc_tos(), &invalid, lp_invalid_users(snum));
 549                 if (invalid &&
 550                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 551
 552                         /* This is used in sec=share only, so no current user
 553                          * around to pass to str_list_sub_basic() */
 554
 555                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 556                                 ret = !user_in_list(user,
 557                                                     (const char **)invalid);
 558                         }
 559                 }
 560         }
 561         TALLOC_FREE(invalid);
 562
 563         if (ret && lp_valid_users(snum)) {
 564                 str_list_copy(talloc_tos(), &valid, lp_valid_users(snum));
 565                 if ( valid &&
 566                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 567
 568                         /* This is used in sec=share only, so no current user
 569                          * around to pass to str_list_sub_basic() */
 570
 571                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 572                                 ret = user_in_list(user, (const char **)valid);
 573                         }
 574                 }
 575         }
 576         TALLOC_FREE(valid);
 577
 578         if (ret && lp_onlyuser(snum)) {
 579                 char **user_list = str_list_make(
 580                         talloc_tos(), lp_username(snum), NULL);
 581                 if (user_list &&
 582                     str_list_substitute(user_list, "%S",
 583                                         lp_servicename(snum))) {
 584                         ret = user_in_list(user, (const char **)user_list);
 585                 }
 586                 TALLOC_FREE(user_list);
 587         }
 588
 589         return(ret);
 590 }
 591
 592 /****************************************************************************
 593  Validate a group username entry. Return the username or NULL.
 594 ****************************************************************************/
 595
 596 static char *validate_group(char *group, DATA_BLOB password,int snum)
 597 {
 598 #ifdef HAVE_NETGROUP
 599         {
 600                 char *host, *user, *domain;
 601                 setnetgrent(group);
 602                 while (getnetgrent(&host, &user, &domain)) {
 603                         if (user) {
 604                                 if (user_ok(user, snum) &&
 605                                     password_ok(user,password)) {
 606                                         endnetgrent();
 607                                         return(user);
 608                                 }
 609                         }
 610                 }
 611                 endnetgrent();
 612         }
 613 #endif
 614
 615 #ifdef HAVE_GETGRENT
 616         {
 617                 struct group *gptr;
 618                 setgrent();
 619                 while ((gptr = (struct group *)getgrent())) {
 620                         if (strequal(gptr->gr_name,group))
 621                                 break;
 622                 }
 623
 624                 /*
 625                  * As user_ok can recurse doing a getgrent(), we must
 626                  * copy the member list onto the heap before
 627                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 628                  */
 629
 630                 if (gptr) {
 631                         char *member_list = NULL;
 632                         size_t list_len = 0;
 633                         char *member;
 634                         int i;
 635
 636                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 637                                 list_len += strlen(gptr->gr_mem[i])+1;
 638                         }
 639                         list_len++;
 640
 641                         member_list = (char *)SMB_MALLOC(list_len);
 642                         if (!member_list) {
 643                                 endgrent();
 644                                 return NULL;
 645                         }
 646
 647                         *member_list = '\0';
 648                         member = member_list;
 649
 650                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 651                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 652
 653                                 DEBUG(10,("validate_group: = gr_mem = "
 654                                           "%s\n", gptr->gr_mem[i]));
 655
 656                                 safe_strcpy(member, gptr->gr_mem[i],
 657                                         list_len - (member-member_list));
 658                                 member += member_len;
 659                         }
 660
 661                         endgrent();
 662
 663                         member = member_list;
 664                         while (*member) {
 665                                 if (user_ok(member,snum) &&
 666                                     password_ok(member,password)) {
 667                                         char *name = talloc_strdup(talloc_tos(),
 668                                                                 member);
 669                                         SAFE_FREE(member_list);
 670                                         return name;
 671                                 }
 672
 673                                 DEBUG(10,("validate_group = member = %s\n",
 674                                           member));
 675
 676                                 member += strlen(member) + 1;
 677                         }
 678
 679                         SAFE_FREE(member_list);
 680                 } else {
 681                         endgrent();
 682                         return NULL;
 683                 }
 684         }
 685 #endif
 686         return(NULL);
 687 }
 688
 689 /****************************************************************************
 690  Check for authority to login to a service with a given username/password.
 691  Note this is *NOT* used when logging on using sessionsetup_and_X.
 692 ****************************************************************************/
 693
 694 bool authorise_login(int snum, fstring user, DATA_BLOB password,
 695                      bool *guest)
 696 {
 697         bool ok = False;
 698
 699 #ifdef DEBUG_PASSWORD
 700         DEBUG(100,("authorise_login: checking authorisation on "
 701                    "user=%s pass=%s\n", user,password.data));
 702 #endif
 703
 704         *guest = False;
 705
 706         /* there are several possibilities:
 707                 1) login as the given user with given password
 708                 2) login as a previously registered username with the given
 709                    password
 710                 3) login as a session list username with the given password
 711                 4) login as a previously validated user/password pair
 712                 5) login as the "user =" user with given password
 713                 6) login as the "user =" user with no password
 714                    (guest connection)
 715                 7) login as guest user with no password
 716
 717                 if the service is guest_only then steps 1 to 5 are skipped
 718         */
 719
 720         /* now check the list of session users */
 721         if (!ok) {
 722                 char *auser;
 723                 char *user_list = NULL;
 724                 char *saveptr;
 725
 726                 if ( session_userlist )
 727                         user_list = SMB_STRDUP(session_userlist);
 728                 else
 729                         user_list = SMB_STRDUP("");
 730
 731                 if (!user_list)
 732                         return(False);
 733
 734                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 735                      !ok && auser;
 736                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 737                         fstring user2;
 738                         fstrcpy(user2,auser);
 739                         if (!user_ok(user2,snum))
 740                                 continue;
 741
 742                         if (password_ok(user2,password)) {
 743                                 ok = True;
 744                                 fstrcpy(user,user2);
 745                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 746                                          "list username (%s) and given "
 747                                          "password ok\n", user));
 748                         }
 749                 }
 750
 751                 SAFE_FREE(user_list);
 752         }
 753
 754         /* check the user= fields and the given password */
 755         if (!ok && lp_username(snum)) {
 756                 TALLOC_CTX *ctx = talloc_tos();
 757                 char *auser;
 758                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 759                 char *saveptr;
 760
 761                 if (!user_list) {
 762                         goto check_guest;
 763                 }
 764
 765                 user_list = talloc_string_sub(ctx,
 766                                 user_list,
 767                                 "%S",
 768                                 lp_servicename(snum));
 769
 770                 if (!user_list) {
 771                         goto check_guest;
 772                 }
 773
 774                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 775                      auser && !ok;
 776                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 777                         if (*auser == '@') {
 778                                 auser = validate_group(auser+1,password,snum);
 779                                 if (auser) {
 780                                         ok = True;
 781                                         fstrcpy(user,auser);
 782                                         DEBUG(3,("authorise_login: ACCEPTED: "
 783                                                  "group username and given "
 784                                                  "password ok (%s)\n", user));
 785                                 }
 786                         } else {
 787                                 fstring user2;
 788                                 fstrcpy(user2,auser);
 789                                 if (user_ok(user2,snum) &&
 790                                     password_ok(user2,password)) {
 791                                         ok = True;
 792                                         fstrcpy(user,user2);
 793                                         DEBUG(3,("authorise_login: ACCEPTED: "
 794                                                  "user list username and "
 795                                                  "given password ok (%s)\n",
 796                                                  user));
 797                                 }
 798                         }
 799                 }
 800         }
 801
 802   check_guest:
 803
 804         /* check for a normal guest connection */
 805         if (!ok && GUEST_OK(snum)) {
 806                 struct passwd *guest_pw;
 807                 fstring guestname;
 808                 fstrcpy(guestname,lp_guestaccount());
 809                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 810                 if (guest_pw != NULL) {
 811                         fstrcpy(user,guestname);
 812                         ok = True;
 813                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 814                                  "and guest ok (%s)\n", user));
 815                 } else {
 816                         DEBUG(0,("authorise_login: Invalid guest account "
 817                                  "%s??\n",guestname));
 818                 }
 819                 TALLOC_FREE(guest_pw);
 820                 *guest = True;
 821         }
 822
 823         if (ok && !user_ok(user, snum)) {
 824                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 825                 ok = False;
 826         }
 827
 828         return(ok);
 829 }