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