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         /* Paranoia check. */
 159         if(lp_security() == SEC_SHARE) {
 160                 smb_panic("Tried to register uid in security=share\n");
 161         }
 162
 163         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 164         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 165                 data_blob_free(&session_key);
 166                 return UID_FIELD_INVALID;
 167         }
 168
 169         if((vuser = SMB_MALLOC_P(user_struct)) == NULL) {
 170                 DEBUG(0,("Failed to malloc users struct!\n"));
 171                 data_blob_free(&session_key);
 172                 return UID_FIELD_INVALID;
 173         }
 174
 175         ZERO_STRUCTP(vuser);
 176
 177         /* Allocate a free vuid. Yes this is a linear search... :-) */
 178         while( get_valid_user_struct(next_vuid) != NULL ) {
 179                 next_vuid++;
 180                 /* Check for vuid wrap. */
 181                 if (next_vuid == UID_FIELD_INVALID)
 182                         next_vuid = VUID_OFFSET;
 183         }
 184
 185         DEBUG(10,("register_vuid: allocated vuid = %u\n",
 186                   (unsigned int)next_vuid ));
 187
 188         vuser->vuid = next_vuid;
 189
 190         if (!server_info) {
 191                 /*
 192                  * This happens in an unfinished NTLMSSP session setup. We
 193                  * need to allocate a vuid between the first and second calls
 194                  * to NTLMSSP.
 195                  */
 196                 next_vuid++;
 197                 num_validated_vuids++;
 198
 199                 vuser->server_info = NULL;
 200
 201                 DLIST_ADD(validated_users, vuser);
 202
 203                 return vuser->vuid;
 204         }
 205
 206         /* the next functions should be done by a SID mapping system (SMS) as
 207          * the new real sam db won't have reference to unix uids or gids
 208          */
 209
 210         vuser->uid = server_info->uid;
 211         vuser->gid = server_info->gid;
 212
 213         vuser->n_groups = server_info->n_groups;
 214         if (vuser->n_groups) {
 215                 if (!(vuser->groups = (gid_t *)memdup(server_info->groups,
 216                                                       sizeof(gid_t) *
 217                                                       vuser->n_groups))) {
 218                         DEBUG(0,("register_vuid: failed to memdup "
 219                                  "vuser->groups\n"));
 220                         data_blob_free(&session_key);
 221                         free(vuser);
 222                         TALLOC_FREE(server_info);
 223                         return UID_FIELD_INVALID;
 224                 }
 225         }
 226
 227         vuser->guest = server_info->guest;
 228         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 229
 230         /* This is a potentially untrusted username */
 231         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 232                      sizeof(vuser->user.smb_name));
 233
 234         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 235         fstrcpy(vuser->user.full_name,
 236                 pdb_get_fullname(server_info->sam_account));
 237
 238         {
 239                 /* Keep the homedir handy */
 240                 const char *homedir =
 241                         pdb_get_homedir(server_info->sam_account);
 242                 const char *logon_script =
 243                         pdb_get_logon_script(server_info->sam_account);
 244
 245                 if (!IS_SAM_DEFAULT(server_info->sam_account,
 246                                     PDB_UNIXHOMEDIR)) {
 247                         const char *unix_homedir =
 248                                 pdb_get_unix_homedir(server_info->sam_account);
 249                         if (unix_homedir) {
 250                                 vuser->unix_homedir =
 251                                         smb_xstrdup(unix_homedir);
 252                         }
 253                 } else {
 254                         struct passwd *passwd =
 255                                 getpwnam_alloc(NULL, vuser->user.unix_name);
 256                         if (passwd) {
 257                                 vuser->unix_homedir =
 258                                         smb_xstrdup(passwd->pw_dir);
 259                                 TALLOC_FREE(passwd);
 260                         }
 261                 }
 262
 263                 if (homedir) {
 264                         vuser->homedir = smb_xstrdup(homedir);
 265                 }
 266                 if (logon_script) {
 267                         vuser->logon_script = smb_xstrdup(logon_script);
 268                 }
 269         }
 270
 271         vuser->session_key = session_key;
 272
 273         DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
 274                   (unsigned int)vuser->uid,
 275                   (unsigned int)vuser->gid,
 276                   vuser->user.unix_name, vuser->user.smb_name,
 277                   vuser->user.domain, vuser->guest ));
 278
 279         DEBUG(3, ("User name: %s\tReal name: %s\n", vuser->user.unix_name,
 280                   vuser->user.full_name));
 281
 282         if (server_info->ptok) {
 283                 vuser->nt_user_token = dup_nt_token(NULL, server_info->ptok);
 284         } else {
 285                 DEBUG(1, ("server_info does not contain a user_token - "
 286                           "cannot continue\n"));
 287                 TALLOC_FREE(server_info);
 288                 data_blob_free(&session_key);
 289                 SAFE_FREE(vuser->homedir);
 290                 SAFE_FREE(vuser->unix_homedir);
 291                 SAFE_FREE(vuser->logon_script);
 292
 293                 SAFE_FREE(vuser);
 294                 return UID_FIELD_INVALID;
 295         }
 296
 297         /* use this to keep tabs on all our info from the authentication */
 298         vuser->server_info = server_info;
 299
 300         DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
 301                  (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
 302
 303         next_vuid++;
 304         num_validated_vuids++;
 305
 306         DLIST_ADD(validated_users, vuser);
 307
 308         if (!session_claim(vuser)) {
 309                 DEBUG(1, ("Failed to claim session for vuid=%d\n",
 310                           vuser->vuid));
 311                 invalidate_vuid(vuser->vuid);
 312                 return UID_FIELD_INVALID;
 313         }
 314
 315         /* Register a home dir service for this user iff
 316
 317            (a) This is not a guest connection,
 318            (b) we have a home directory defined
 319            (c) there s not an existing static share by that name
 320
 321            If a share exists by this name (autoloaded or not) reuse it . */
 322
 323         vuser->homes_snum = -1;
 324
 325         if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir))
 326         {
 327                 int servicenumber = lp_servicenumber(vuser->user.unix_name);
 328
 329                 if ( servicenumber == -1 ) {
 330                         DEBUG(3, ("Adding homes service for user '%s' using "
 331                                   "home directory: '%s'\n",
 332                                 vuser->user.unix_name, vuser->unix_homedir));
 333                         vuser->homes_snum =
 334                                 add_home_service(vuser->user.unix_name,
 335                                                  vuser->user.unix_name,
 336                                                  vuser->unix_homedir);
 337                 } else {
 338                         DEBUG(3, ("Using static (or previously created) "
 339                                   "service for user '%s'; path = '%s'\n",
 340                                   vuser->user.unix_name,
 341                                   lp_pathname(servicenumber) ));
 342                         vuser->homes_snum = servicenumber;
 343                 }
 344         }
 345
 346         if (srv_is_signing_negotiated() && !vuser->guest &&
 347             !srv_signing_started()) {
 348                 /* Try and turn on server signing on the first non-guest
 349                  * sessionsetup. */
 350                 srv_set_signing(vuser->session_key, response_blob);
 351         }
 352
 353         /* fill in the current_user_info struct */
 354         set_current_user_info( &vuser->user );
 355
 356
 357         return vuser->vuid;
 358 }
 359
 360 /****************************************************************************
 361  Add a name to the session users list.
 362 ****************************************************************************/
 363
 364 void add_session_user(const char *user)
 365 {
 366         fstring suser;
 367         struct passwd *passwd;
 368
 369         if (!(passwd = Get_Pwnam(user)))
 370                 return;
 371
 372         fstrcpy(suser,passwd->pw_name);
 373
 374         if(!*suser)
 375                 return;
 376
 377         if( session_userlist && in_list(suser,session_userlist,False) )
 378                 return;
 379
 380         if( !session_userlist ||
 381             (strlen(suser) + strlen(session_userlist) + 2 >=
 382              len_session_userlist) ) {
 383                 char *newlist;
 384
 385                 if (len_session_userlist > 128 * PSTRING_LEN) {
 386                         DEBUG(3,("add_session_user: session userlist already "
 387                                  "too large.\n"));
 388                         return;
 389                 }
 390                 newlist = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
 391                         session_userlist,
 392                         len_session_userlist + PSTRING_LEN );
 393                 if( newlist == NULL ) {
 394                         DEBUG(1,("Unable to resize session_userlist\n"));
 395                         return;
 396                 }
 397                 if (!session_userlist) {
 398                         *newlist = '\0';
 399                 }
 400                 session_userlist = newlist;
 401                 len_session_userlist += PSTRING_LEN;
 402         }
 403
 404         safe_strcat(session_userlist," ",len_session_userlist-1);
 405         safe_strcat(session_userlist,suser,len_session_userlist-1);
 406 }
 407
 408 /****************************************************************************
 409  Check if a user is in a netgroup user list. If at first we don't succeed,
 410  try lower case.
 411 ****************************************************************************/
 412
 413 BOOL user_in_netgroup(const char *user, const char *ngname)
 414 {
 415 #ifdef HAVE_NETGROUP
 416         static char *mydomain = NULL;
 417         fstring lowercase_user;
 418
 419         if (mydomain == NULL)
 420                 yp_get_default_domain(&mydomain);
 421
 422         if(mydomain == NULL) {
 423                 DEBUG(5,("Unable to get default yp domain\n"));
 424                 return False;
 425         }
 426
 427         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 428                 user, mydomain, ngname));
 429
 430         if (innetgr(ngname, NULL, user, mydomain)) {
 431                 DEBUG(5,("user_in_netgroup: Found\n"));
 432                 return (True);
 433         } else {
 434
 435                 /*
 436                  * Ok, innetgr is case sensitive. Try once more with lowercase
 437                  * just in case. Attempt to fix #703. JRA.
 438                  */
 439
 440                 fstrcpy(lowercase_user, user);
 441                 strlower_m(lowercase_user);
 442
 443                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 444                         lowercase_user, mydomain, ngname));
 445
 446                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 447                         DEBUG(5,("user_in_netgroup: Found\n"));
 448                         return (True);
 449                 }
 450         }
 451 #endif /* HAVE_NETGROUP */
 452         return False;
 453 }
 454
 455 /****************************************************************************
 456  Check if a user is in a user list - can check combinations of UNIX
 457  and netgroup lists.
 458 ****************************************************************************/
 459
 460 BOOL user_in_list(const char *user,const char **list)
 461 {
 462         if (!list || !*list)
 463                 return False;
 464
 465         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 466
 467         while (*list) {
 468
 469                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 470                           user, *list));
 471
 472                 /*
 473                  * Check raw username.
 474                  */
 475                 if (strequal(user, *list))
 476                         return(True);
 477
 478                 /*
 479                  * Now check to see if any combination
 480                  * of UNIX and netgroups has been specified.
 481                  */
 482
 483                 if(**list == '@') {
 484                         /*
 485                          * Old behaviour. Check netgroup list
 486                          * followed by UNIX list.
 487                          */
 488                         if(user_in_netgroup(user, *list +1))
 489                                 return True;
 490                         if(user_in_group(user, *list +1))
 491                                 return True;
 492                 } else if (**list == '+') {
 493
 494                         if((*(*list +1)) == '&') {
 495                                 /*
 496                                  * Search UNIX list followed by netgroup.
 497                                  */
 498                                 if(user_in_group(user, *list +2))
 499                                         return True;
 500                                 if(user_in_netgroup(user, *list +2))
 501                                         return True;
 502
 503                         } else {
 504
 505                                 /*
 506                                  * Just search UNIX list.
 507                                  */
 508
 509                                 if(user_in_group(user, *list +1))
 510                                         return True;
 511                         }
 512
 513                 } else if (**list == '&') {
 514
 515                         if(*(*list +1) == '+') {
 516                                 /*
 517                                  * Search netgroup list followed by UNIX list.
 518                                  */
 519                                 if(user_in_netgroup(user, *list +2))
 520                                         return True;
 521                                 if(user_in_group(user, *list +2))
 522                                         return True;
 523                         } else {
 524                                 /*
 525                                  * Just search netgroup list.
 526                                  */
 527                                 if(user_in_netgroup(user, *list +1))
 528                                         return True;
 529                         }
 530                 }
 531
 532                 list++;
 533         }
 534         return(False);
 535 }
 536
 537 /****************************************************************************
 538  Check if a username is valid.
 539 ****************************************************************************/
 540
 541 static BOOL user_ok(const char *user, int snum)
 542 {
 543         char **valid, **invalid;
 544         BOOL ret;
 545
 546         valid = invalid = NULL;
 547         ret = True;
 548
 549         if (lp_invalid_users(snum)) {
 550                 str_list_copy(&invalid, lp_invalid_users(snum));
 551                 if (invalid &&
 552                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 553                         if ( invalid &&
 554                              str_list_sub_basic(invalid,
 555                                                 current_user_info.smb_name) ) {
 556                                 ret = !user_in_list(user,
 557                                                     (const char **)invalid);
 558                         }
 559                 }
 560         }
 561         if (invalid)
 562                 str_list_free (&invalid);
 563
 564         if (ret && lp_valid_users(snum)) {
 565                 str_list_copy(&valid, lp_valid_users(snum));
 566                 if ( valid &&
 567                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 568                         if ( valid &&
 569                              str_list_sub_basic(valid,
 570                                                 current_user_info.smb_name) ) {
 571                                 ret = user_in_list(user, (const char **)valid);
 572                         }
 573                 }
 574         }
 575         if (valid)
 576                 str_list_free (&valid);
 577
 578         if (ret && lp_onlyuser(snum)) {
 579                 char **user_list = str_list_make (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                 if (user_list) str_list_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 into a pstring on the stack before
 626                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 627                  */
 628
 629                 if (gptr) {
 630                         pstring member_list;
 631                         char *member;
 632                         size_t copied_len = 0;
 633                         int i;
 634
 635                         *member_list = '\0';
 636                         member = member_list;
 637
 638                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 639                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 640                                 if(copied_len+member_len < sizeof(pstring)) {
 641
 642                                         DEBUG(10,("validate_group: = gr_mem = "
 643                                                   "%s\n", gptr->gr_mem[i]));
 644
 645                                         safe_strcpy(member, gptr->gr_mem[i],
 646                                                     sizeof(pstring) -
 647                                                     copied_len - 1);
 648                                         copied_len += member_len;
 649                                         member += copied_len;
 650                                 } else {
 651                                         *member = '\0';
 652                                 }
 653                         }
 654
 655                         endgrent();
 656
 657                         member = member_list;
 658                         while (*member) {
 659                                 static fstring name;
 660                                 fstrcpy(name,member);
 661                                 if (user_ok(name,snum) &&
 662                                     password_ok(name,password)) {
 663                                         endgrent();
 664                                         return(&name[0]);
 665                                 }
 666
 667                                 DEBUG(10,("validate_group = member = %s\n",
 668                                           member));
 669
 670                                 member += strlen(member) + 1;
 671                         }
 672                 } else {
 673                         endgrent();
 674                         return NULL;
 675                 }
 676         }
 677 #endif
 678         return(NULL);
 679 }
 680
 681 /****************************************************************************
 682  Check for authority to login to a service with a given username/password.
 683  Note this is *NOT* used when logging on using sessionsetup_and_X.
 684 ****************************************************************************/
 685
 686 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
 687                      BOOL *guest)
 688 {
 689         BOOL ok = False;
 690
 691 #ifdef DEBUG_PASSWORD
 692         DEBUG(100,("authorise_login: checking authorisation on "
 693                    "user=%s pass=%s\n", user,password.data));
 694 #endif
 695
 696         *guest = False;
 697
 698         /* there are several possibilities:
 699                 1) login as the given user with given password
 700                 2) login as a previously registered username with the given
 701                    password
 702                 3) login as a session list username with the given password
 703                 4) login as a previously validated user/password pair
 704                 5) login as the "user =" user with given password
 705                 6) login as the "user =" user with no password
 706                    (guest connection)
 707                 7) login as guest user with no password
 708
 709                 if the service is guest_only then steps 1 to 5 are skipped
 710         */
 711
 712         /* now check the list of session users */
 713         if (!ok) {
 714                 char *auser;
 715                 char *user_list = NULL;
 716
 717                 if ( session_userlist )
 718                         user_list = SMB_STRDUP(session_userlist);
 719                 else
 720                         user_list = SMB_STRDUP("");
 721
 722                 if (!user_list)
 723                         return(False);
 724
 725                 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
 726                      auser = strtok(NULL,LIST_SEP)) {
 727                         fstring user2;
 728                         fstrcpy(user2,auser);
 729                         if (!user_ok(user2,snum))
 730                                 continue;
 731
 732                         if (password_ok(user2,password)) {
 733                                 ok = True;
 734                                 fstrcpy(user,user2);
 735                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 736                                          "list username (%s) and given "
 737                                          "password ok\n", user));
 738                         }
 739                 }
 740
 741                 SAFE_FREE(user_list);
 742         }
 743
 744         /* check the user= fields and the given password */
 745         if (!ok && lp_username(snum)) {
 746                 char *auser;
 747                 pstring user_list;
 748                 pstrcpy(user_list,lp_username(snum));
 749
 750                 pstring_sub(user_list,"%S",lp_servicename(snum));
 751
 752                 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
 753                      auser = strtok(NULL,LIST_SEP)) {
 754                         if (*auser == '@') {
 755                                 auser = validate_group(auser+1,password,snum);
 756                                 if (auser) {
 757                                         ok = True;
 758                                         fstrcpy(user,auser);
 759                                         DEBUG(3,("authorise_login: ACCEPTED: "
 760                                                  "group username and given "
 761                                                  "password ok (%s)\n", user));
 762                                 }
 763                         } else {
 764                                 fstring user2;
 765                                 fstrcpy(user2,auser);
 766                                 if (user_ok(user2,snum) &&
 767                                     password_ok(user2,password)) {
 768                                         ok = True;
 769                                         fstrcpy(user,user2);
 770                                         DEBUG(3,("authorise_login: ACCEPTED: "
 771                                                  "user list username and "
 772                                                  "given password ok (%s)\n",
 773                                                  user));
 774                                 }
 775                         }
 776                 }
 777         }
 778
 779         /* check for a normal guest connection */
 780         if (!ok && GUEST_OK(snum)) {
 781                 fstring guestname;
 782                 fstrcpy(guestname,lp_guestaccount());
 783                 if (Get_Pwnam(guestname)) {
 784                         fstrcpy(user,guestname);
 785                         ok = True;
 786                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 787                                  "and guest ok (%s)\n", user));
 788                 } else {
 789                         DEBUG(0,("authorise_login: Invalid guest account "
 790                                  "%s??\n",guestname));
 791                 }
 792                 *guest = True;
 793         }
 794
 795         if (ok && !user_ok(user, snum)) {
 796                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 797                 ok = False;
 798         }
 799
 800         return(ok);
 801 }