source3/smbd/password.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /* users from session setup */
  24 static char *session_userlist = NULL;
  25 static int len_session_userlist = 0;
  26
  27 /* this holds info on user ids that are already validated for this VC */
  28 static user_struct *validated_users;
  29 static int next_vuid = VUID_OFFSET;
  30 static int num_validated_vuids;
  31
  32 extern userdom_struct current_user_info;
  33
  34
  35 /****************************************************************************
  36  Check if a uid has been validated, and return an pointer to the user_struct
  37  if it has. NULL if not. vuid is biased by an offset. This allows us to
  38  tell random client vuid's (normally zero) from valid vuids.
  39 ****************************************************************************/
  40
  41 user_struct *get_valid_user_struct(uint16 vuid)
  42 {
  43         user_struct *usp;
  44         int count=0;
  45
  46         if (vuid == UID_FIELD_INVALID)
  47                 return NULL;
  48
  49         for (usp=validated_users;usp;usp=usp->next,count++) {
  50                 if (vuid == usp->vuid && usp->server_info) {
  51                         if (count > 10) {
  52                                 DLIST_PROMOTE(validated_users, usp);
  53                         }
  54                         return usp;
  55                 }
  56         }
  57
  58         return NULL;
  59 }
  60
  61 /****************************************************************************
  62  Get the user struct of a partial NTLMSSP login
  63 ****************************************************************************/
  64
  65 user_struct *get_partial_auth_user_struct(uint16 vuid)
  66 {
  67         user_struct *usp;
  68         int count=0;
  69
  70         if (vuid == UID_FIELD_INVALID)
  71                 return NULL;
  72
  73         for (usp=validated_users;usp;usp=usp->next,count++) {
  74                 if (vuid == usp->vuid && !usp->server_info) {
  75                         if (count > 10) {
  76                                 DLIST_PROMOTE(validated_users, usp);
  77                         }
  78                         return usp;
  79                 }
  80         }
  81
  82         return NULL;
  83 }
  84
  85 /****************************************************************************
  86  Invalidate a uid.
  87 ****************************************************************************/
  88
  89 void invalidate_vuid(uint16 vuid)
  90 {
  91         user_struct *vuser = get_valid_user_struct(vuid);
  92
  93         if (vuser == NULL)
  94                 return;
  95
  96         SAFE_FREE(vuser->homedir);
  97         SAFE_FREE(vuser->unix_homedir);
  98         SAFE_FREE(vuser->logon_script);
  99
 100         session_yield(vuser);
 101         SAFE_FREE(vuser->session_keystr);
 102
 103         TALLOC_FREE(vuser->server_info);
 104
 105         data_blob_free(&vuser->session_key);
 106
 107         DLIST_REMOVE(validated_users, vuser);
 108
 109         /* clear the vuid from the 'cache' on each connection, and
 110            from the vuid 'owner' of connections */
 111         conn_clear_vuid_cache(vuid);
 112
 113         SAFE_FREE(vuser->groups);
 114         TALLOC_FREE(vuser->nt_user_token);
 115         SAFE_FREE(vuser);
 116         num_validated_vuids--;
 117 }
 118
 119 /****************************************************************************
 120  Invalidate all vuid entries for this process.
 121 ****************************************************************************/
 122
 123 void invalidate_all_vuids(void)
 124 {
 125         user_struct *usp, *next=NULL;
 126
 127         for (usp=validated_users;usp;usp=next) {
 128                 next = usp->next;
 129
 130                 invalidate_vuid(usp->vuid);
 131         }
 132 }
 133
 134 /**
 135  *  register that a valid login has been performed, establish 'session'.
 136  *  @param server_info The token returned from the authentication process.
 137  *   (now 'owned' by register_vuid)
 138  *
 139  *  @param session_key The User session key for the login session (now also
 140  *  'owned' by register_vuid)
 141  *
 142  *  @param respose_blob The NT challenge-response, if available.  (May be
 143  *  freed after this call)
 144  *
 145  *  @param smb_name The untranslated name of the user
 146  *
 147  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 148  *   tell random client vuid's (normally zero) from valid vuids.)
 149  *
 150  */
 151
 152 int register_vuid(auth_serversupplied_info *server_info,
 153                   DATA_BLOB session_key, DATA_BLOB response_blob,
 154                   const char *smb_name)
 155 {
 156         user_struct *vuser = NULL;
 157
 158         /* Ensure no vuid gets registered in share level security. */
 159         if(lp_security() == SEC_SHARE) {
 160                 data_blob_free(&session_key);
 161                 return UID_FIELD_INVALID;
 162         }
 163
 164         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 165         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 166                 data_blob_free(&session_key);
 167                 return UID_FIELD_INVALID;
 168         }
 169
 170         if((vuser = SMB_MALLOC_P(user_struct)) == NULL) {
 171                 DEBUG(0,("Failed to malloc users struct!\n"));
 172                 data_blob_free(&session_key);
 173                 return UID_FIELD_INVALID;
 174         }
 175
 176         ZERO_STRUCTP(vuser);
 177
 178         /* Allocate a free vuid. Yes this is a linear search... :-) */
 179         while( get_valid_user_struct(next_vuid) != NULL ) {
 180                 next_vuid++;
 181                 /* Check for vuid wrap. */
 182                 if (next_vuid == UID_FIELD_INVALID)
 183                         next_vuid = VUID_OFFSET;
 184         }
 185
 186         DEBUG(10,("register_vuid: allocated vuid = %u\n",
 187                   (unsigned int)next_vuid ));
 188
 189         vuser->vuid = next_vuid;
 190
 191         if (!server_info) {
 192                 next_vuid++;
 193                 num_validated_vuids++;
 194
 195                 vuser->server_info = NULL;
 196
 197                 DLIST_ADD(validated_users, vuser);
 198
 199                 return vuser->vuid;
 200         }
 201
 202         /* the next functions should be done by a SID mapping system (SMS) as
 203          * the new real sam db won't have reference to unix uids or gids
 204          */
 205
 206         vuser->uid = server_info->uid;
 207         vuser->gid = server_info->gid;
 208
 209         vuser->n_groups = server_info->n_groups;
 210         if (vuser->n_groups) {
 211                 if (!(vuser->groups = (gid_t *)memdup(server_info->groups,
 212                                                       sizeof(gid_t) *
 213                                                       vuser->n_groups))) {
 214                         DEBUG(0,("register_vuid: failed to memdup "
 215                                  "vuser->groups\n"));
 216                         data_blob_free(&session_key);
 217                         free(vuser);
 218                         TALLOC_FREE(server_info);
 219                         return UID_FIELD_INVALID;
 220                 }
 221         }
 222
 223         vuser->guest = server_info->guest;
 224         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 225
 226         /* This is a potentially untrusted username */
 227         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 228                      sizeof(vuser->user.smb_name));
 229
 230         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 231         fstrcpy(vuser->user.full_name,
 232                 pdb_get_fullname(server_info->sam_account));
 233
 234         {
 235                 /* Keep the homedir handy */
 236                 const char *homedir =
 237                         pdb_get_homedir(server_info->sam_account);
 238                 const char *logon_script =
 239                         pdb_get_logon_script(server_info->sam_account);
 240
 241                 if (!IS_SAM_DEFAULT(server_info->sam_account,
 242                                     PDB_UNIXHOMEDIR)) {
 243                         const char *unix_homedir =
 244                                 pdb_get_unix_homedir(server_info->sam_account);
 245                         if (unix_homedir) {
 246                                 vuser->unix_homedir =
 247                                         smb_xstrdup(unix_homedir);
 248                         }
 249                 } else {
 250                         struct passwd *passwd =
 251                                 getpwnam_alloc(NULL, vuser->user.unix_name);
 252                         if (passwd) {
 253                                 vuser->unix_homedir =
 254                                         smb_xstrdup(passwd->pw_dir);
 255                                 TALLOC_FREE(passwd);
 256                         }
 257                 }
 258
 259                 if (homedir) {
 260                         vuser->homedir = smb_xstrdup(homedir);
 261                 }
 262                 if (logon_script) {
 263                         vuser->logon_script = smb_xstrdup(logon_script);
 264                 }
 265         }
 266
 267         vuser->session_key = session_key;
 268
 269         DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
 270                   (unsigned int)vuser->uid,
 271                   (unsigned int)vuser->gid,
 272                   vuser->user.unix_name, vuser->user.smb_name,
 273                   vuser->user.domain, vuser->guest ));
 274
 275         DEBUG(3, ("User name: %s\tReal name: %s\n", vuser->user.unix_name,
 276                   vuser->user.full_name));
 277
 278         if (server_info->ptok) {
 279                 vuser->nt_user_token = dup_nt_token(NULL, server_info->ptok);
 280         } else {
 281                 DEBUG(1, ("server_info does not contain a user_token - "
 282                           "cannot continue\n"));
 283                 TALLOC_FREE(server_info);
 284                 data_blob_free(&session_key);
 285                 SAFE_FREE(vuser->homedir);
 286                 SAFE_FREE(vuser->unix_homedir);
 287                 SAFE_FREE(vuser->logon_script);
 288
 289                 SAFE_FREE(vuser);
 290                 return UID_FIELD_INVALID;
 291         }
 292
 293         /* use this to keep tabs on all our info from the authentication */
 294         vuser->server_info = server_info;
 295
 296         DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
 297                  (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
 298
 299         next_vuid++;
 300         num_validated_vuids++;
 301
 302         DLIST_ADD(validated_users, vuser);
 303
 304         if (!session_claim(vuser)) {
 305                 DEBUG(1, ("Failed to claim session for vuid=%d\n",
 306                           vuser->vuid));
 307                 invalidate_vuid(vuser->vuid);
 308                 return -1;
 309         }
 310
 311         /* Register a home dir service for this user iff
 312
 313            (a) This is not a guest connection,
 314            (b) we have a home directory defined
 315            (c) there s not an existing static share by that name
 316
 317            If a share exists by this name (autoloaded or not) reuse it . */
 318
 319         vuser->homes_snum = -1;
 320
 321         if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir))
 322         {
 323                 int servicenumber = lp_servicenumber(vuser->user.unix_name);
 324
 325                 if ( servicenumber == -1 ) {
 326                         DEBUG(3, ("Adding homes service for user '%s' using "
 327                                   "home directory: '%s'\n",
 328                                 vuser->user.unix_name, vuser->unix_homedir));
 329                         vuser->homes_snum =
 330                                 add_home_service(vuser->user.unix_name,
 331                                                  vuser->user.unix_name,
 332                                                  vuser->unix_homedir);
 333                 } else {
 334                         DEBUG(3, ("Using static (or previously created) "
 335                                   "service for user '%s'; path = '%s'\n",
 336                                   vuser->user.unix_name,
 337                                   lp_pathname(servicenumber) ));
 338                         vuser->homes_snum = servicenumber;
 339                 }
 340         }
 341
 342         if (srv_is_signing_negotiated() && !vuser->guest &&
 343             !srv_signing_started()) {
 344                 /* Try and turn on server signing on the first non-guest
 345                  * sessionsetup. */
 346                 srv_set_signing(vuser->session_key, response_blob);
 347         }
 348
 349         /* fill in the current_user_info struct */
 350         set_current_user_info( &vuser->user );
 351
 352
 353         return vuser->vuid;
 354 }
 355
 356 /****************************************************************************
 357  Add a name to the session users list.
 358 ****************************************************************************/
 359
 360 void add_session_user(const char *user)
 361 {
 362         fstring suser;
 363         struct passwd *passwd;
 364
 365         if (!(passwd = Get_Pwnam(user)))
 366                 return;
 367
 368         fstrcpy(suser,passwd->pw_name);
 369
 370         if(!*suser)
 371                 return;
 372
 373         if( session_userlist && in_list(suser,session_userlist,False) )
 374                 return;
 375
 376         if( !session_userlist ||
 377             (strlen(suser) + strlen(session_userlist) + 2 >=
 378              len_session_userlist) ) {
 379                 char *newlist;
 380
 381                 if (len_session_userlist > 128 * PSTRING_LEN) {
 382                         DEBUG(3,("add_session_user: session userlist already "
 383                                  "too large.\n"));
 384                         return;
 385                 }
 386                 newlist = (char *)SMB_REALLOC(
 387                         session_userlist,
 388                         len_session_userlist + PSTRING_LEN );
 389                 if( newlist == NULL ) {
 390                         DEBUG(1,("Unable to resize session_userlist\n"));
 391                         return;
 392                 }
 393                 if (!session_userlist) {
 394                         *newlist = '\0';
 395                 }
 396                 session_userlist = newlist;
 397                 len_session_userlist += PSTRING_LEN;
 398         }
 399
 400         safe_strcat(session_userlist," ",len_session_userlist-1);
 401         safe_strcat(session_userlist,suser,len_session_userlist-1);
 402 }
 403
 404 /****************************************************************************
 405  Check if a user is in a netgroup user list. If at first we don't succeed,
 406  try lower case.
 407 ****************************************************************************/
 408
 409 BOOL user_in_netgroup(const char *user, const char *ngname)
 410 {
 411 #ifdef HAVE_NETGROUP
 412         static char *mydomain = NULL;
 413         fstring lowercase_user;
 414
 415         if (mydomain == NULL)
 416                 yp_get_default_domain(&mydomain);
 417
 418         if(mydomain == NULL) {
 419                 DEBUG(5,("Unable to get default yp domain\n"));
 420                 return False;
 421         }
 422
 423         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 424                 user, mydomain, ngname));
 425
 426         if (innetgr(ngname, NULL, user, mydomain)) {
 427                 DEBUG(5,("user_in_netgroup: Found\n"));
 428                 return (True);
 429         } else {
 430
 431                 /*
 432                  * Ok, innetgr is case sensitive. Try once more with lowercase
 433                  * just in case. Attempt to fix #703. JRA.
 434                  */
 435
 436                 fstrcpy(lowercase_user, user);
 437                 strlower_m(lowercase_user);
 438
 439                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 440                         lowercase_user, mydomain, ngname));
 441
 442                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 443                         DEBUG(5,("user_in_netgroup: Found\n"));
 444                         return (True);
 445                 }
 446         }
 447 #endif /* HAVE_NETGROUP */
 448         return False;
 449 }
 450
 451 /****************************************************************************
 452  Check if a user is in a user list - can check combinations of UNIX
 453  and netgroup lists.
 454 ****************************************************************************/
 455
 456 BOOL user_in_list(const char *user,const char **list)
 457 {
 458         if (!list || !*list)
 459                 return False;
 460
 461         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 462
 463         while (*list) {
 464
 465                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 466                           user, *list));
 467
 468                 /*
 469                  * Check raw username.
 470                  */
 471                 if (strequal(user, *list))
 472                         return(True);
 473
 474                 /*
 475                  * Now check to see if any combination
 476                  * of UNIX and netgroups has been specified.
 477                  */
 478
 479                 if(**list == '@') {
 480                         /*
 481                          * Old behaviour. Check netgroup list
 482                          * followed by UNIX list.
 483                          */
 484                         if(user_in_netgroup(user, *list +1))
 485                                 return True;
 486                         if(user_in_group(user, *list +1))
 487                                 return True;
 488                 } else if (**list == '+') {
 489
 490                         if((*(*list +1)) == '&') {
 491                                 /*
 492                                  * Search UNIX list followed by netgroup.
 493                                  */
 494                                 if(user_in_group(user, *list +2))
 495                                         return True;
 496                                 if(user_in_netgroup(user, *list +2))
 497                                         return True;
 498
 499                         } else {
 500
 501                                 /*
 502                                  * Just search UNIX list.
 503                                  */
 504
 505                                 if(user_in_group(user, *list +1))
 506                                         return True;
 507                         }
 508
 509                 } else if (**list == '&') {
 510
 511                         if(*(*list +1) == '+') {
 512                                 /*
 513                                  * Search netgroup list followed by UNIX list.
 514                                  */
 515                                 if(user_in_netgroup(user, *list +2))
 516                                         return True;
 517                                 if(user_in_group(user, *list +2))
 518                                         return True;
 519                         } else {
 520                                 /*
 521                                  * Just search netgroup list.
 522                                  */
 523                                 if(user_in_netgroup(user, *list +1))
 524                                         return True;
 525                         }
 526                 }
 527
 528                 list++;
 529         }
 530         return(False);
 531 }
 532
 533 /****************************************************************************
 534  Check if a username is valid.
 535 ****************************************************************************/
 536
 537 static BOOL user_ok(const char *user, int snum)
 538 {
 539         char **valid, **invalid;
 540         BOOL ret;
 541
 542         valid = invalid = NULL;
 543         ret = True;
 544
 545         if (lp_invalid_users(snum)) {
 546                 str_list_copy(&invalid, lp_invalid_users(snum));
 547                 if (invalid &&
 548                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 549                         if ( invalid &&
 550                              str_list_sub_basic(invalid,
 551                                                 current_user_info.smb_name) ) {
 552                                 ret = !user_in_list(user,
 553                                                     (const char **)invalid);
 554                         }
 555                 }
 556         }
 557         if (invalid)
 558                 str_list_free (&invalid);
 559
 560         if (ret && lp_valid_users(snum)) {
 561                 str_list_copy(&valid, lp_valid_users(snum));
 562                 if ( valid &&
 563                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 564                         if ( valid &&
 565                              str_list_sub_basic(valid,
 566                                                 current_user_info.smb_name) ) {
 567                                 ret = user_in_list(user, (const char **)valid);
 568                         }
 569                 }
 570         }
 571         if (valid)
 572                 str_list_free (&valid);
 573
 574         if (ret && lp_onlyuser(snum)) {
 575                 char **user_list = str_list_make (lp_username(snum), NULL);
 576                 if (user_list &&
 577                     str_list_substitute(user_list, "%S",
 578                                         lp_servicename(snum))) {
 579                         ret = user_in_list(user, (const char **)user_list);
 580                 }
 581                 if (user_list) str_list_free (&user_list);
 582         }
 583
 584         return(ret);
 585 }
 586
 587 /****************************************************************************
 588  Validate a group username entry. Return the username or NULL.
 589 ****************************************************************************/
 590
 591 static char *validate_group(char *group, DATA_BLOB password,int snum)
 592 {
 593 #ifdef HAVE_NETGROUP
 594         {
 595                 char *host, *user, *domain;
 596                 setnetgrent(group);
 597                 while (getnetgrent(&host, &user, &domain)) {
 598                         if (user) {
 599                                 if (user_ok(user, snum) &&
 600                                     password_ok(user,password)) {
 601                                         endnetgrent();
 602                                         return(user);
 603                                 }
 604                         }
 605                 }
 606                 endnetgrent();
 607         }
 608 #endif
 609
 610 #ifdef HAVE_GETGRENT
 611         {
 612                 struct group *gptr;
 613                 setgrent();
 614                 while ((gptr = (struct group *)getgrent())) {
 615                         if (strequal(gptr->gr_name,group))
 616                                 break;
 617                 }
 618
 619                 /*
 620                  * As user_ok can recurse doing a getgrent(), we must
 621                  * copy the member list into a pstring on the stack before
 622                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 623                  */
 624
 625                 if (gptr) {
 626                         pstring member_list;
 627                         char *member;
 628                         size_t copied_len = 0;
 629                         int i;
 630
 631                         *member_list = '\0';
 632                         member = member_list;
 633
 634                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 635                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 636                                 if(copied_len+member_len < sizeof(pstring)) {
 637
 638                                         DEBUG(10,("validate_group: = gr_mem = "
 639                                                   "%s\n", gptr->gr_mem[i]));
 640
 641                                         safe_strcpy(member, gptr->gr_mem[i],
 642                                                     sizeof(pstring) -
 643                                                     copied_len - 1);
 644                                         copied_len += member_len;
 645                                         member += copied_len;
 646                                 } else {
 647                                         *member = '\0';
 648                                 }
 649                         }
 650
 651                         endgrent();
 652
 653                         member = member_list;
 654                         while (*member) {
 655                                 static fstring name;
 656                                 fstrcpy(name,member);
 657                                 if (user_ok(name,snum) &&
 658                                     password_ok(name,password)) {
 659                                         endgrent();
 660                                         return(&name[0]);
 661                                 }
 662
 663                                 DEBUG(10,("validate_group = member = %s\n",
 664                                           member));
 665
 666                                 member += strlen(member) + 1;
 667                         }
 668                 } else {
 669                         endgrent();
 670                         return NULL;
 671                 }
 672         }
 673 #endif
 674         return(NULL);
 675 }
 676
 677 /****************************************************************************
 678  Check for authority to login to a service with a given username/password.
 679  Note this is *NOT* used when logging on using sessionsetup_and_X.
 680 ****************************************************************************/
 681
 682 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
 683                      BOOL *guest)
 684 {
 685         BOOL ok = False;
 686
 687 #ifdef DEBUG_PASSWORD
 688         DEBUG(100,("authorise_login: checking authorisation on "
 689                    "user=%s pass=%s\n", user,password.data));
 690 #endif
 691
 692         *guest = False;
 693
 694         /* there are several possibilities:
 695                 1) login as the given user with given password
 696                 2) login as a previously registered username with the given
 697                    password
 698                 3) login as a session list username with the given password
 699                 4) login as a previously validated user/password pair
 700                 5) login as the "user =" user with given password
 701                 6) login as the "user =" user with no password
 702                    (guest connection)
 703                 7) login as guest user with no password
 704
 705                 if the service is guest_only then steps 1 to 5 are skipped
 706         */
 707
 708         /* now check the list of session users */
 709         if (!ok) {
 710                 char *auser;
 711                 char *user_list = NULL;
 712
 713                 if ( session_userlist )
 714                         user_list = SMB_STRDUP(session_userlist);
 715                 else
 716                         user_list = SMB_STRDUP("");
 717
 718                 if (!user_list)
 719                         return(False);
 720
 721                 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
 722                      auser = strtok(NULL,LIST_SEP)) {
 723                         fstring user2;
 724                         fstrcpy(user2,auser);
 725                         if (!user_ok(user2,snum))
 726                                 continue;
 727
 728                         if (password_ok(user2,password)) {
 729                                 ok = True;
 730                                 fstrcpy(user,user2);
 731                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 732                                          "list username (%s) and given "
 733                                          "password ok\n", user));
 734                         }
 735                 }
 736
 737                 SAFE_FREE(user_list);
 738         }
 739
 740         /* check the user= fields and the given password */
 741         if (!ok && lp_username(snum)) {
 742                 char *auser;
 743                 pstring user_list;
 744                 pstrcpy(user_list,lp_username(snum));
 745
 746                 pstring_sub(user_list,"%S",lp_servicename(snum));
 747
 748                 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
 749                      auser = strtok(NULL,LIST_SEP)) {
 750                         if (*auser == '@') {
 751                                 auser = validate_group(auser+1,password,snum);
 752                                 if (auser) {
 753                                         ok = True;
 754                                         fstrcpy(user,auser);
 755                                         DEBUG(3,("authorise_login: ACCEPTED: "
 756                                                  "group username and given "
 757                                                  "password ok (%s)\n", user));
 758                                 }
 759                         } else {
 760                                 fstring user2;
 761                                 fstrcpy(user2,auser);
 762                                 if (user_ok(user2,snum) &&
 763                                     password_ok(user2,password)) {
 764                                         ok = True;
 765                                         fstrcpy(user,user2);
 766                                         DEBUG(3,("authorise_login: ACCEPTED: "
 767                                                  "user list username and "
 768                                                  "given password ok (%s)\n",
 769                                                  user));
 770                                 }
 771                         }
 772                 }
 773         }
 774
 775         /* check for a normal guest connection */
 776         if (!ok && GUEST_OK(snum)) {
 777                 fstring guestname;
 778                 fstrcpy(guestname,lp_guestaccount());
 779                 if (Get_Pwnam(guestname)) {
 780                         fstrcpy(user,guestname);
 781                         ok = True;
 782                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 783                                  "and guest ok (%s)\n", user));
 784                 } else {
 785                         DEBUG(0,("authorise_login: Invalid guest account "
 786                                  "%s??\n",guestname));
 787                 }
 788                 *guest = True;
 789         }
 790
 791         if (ok && !user_ok(user, snum)) {
 792                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 793                 ok = False;
 794         }
 795
 796         return(ok);
 797 }