source/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 /* 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         SAFE_FREE(vuser->homedir);
  96         SAFE_FREE(vuser->unix_homedir);
  97         SAFE_FREE(vuser->logon_script);
  98
  99         session_yield(vuser);
 100         SAFE_FREE(vuser->session_keystr);
 101
 102         TALLOC_FREE(vuser->server_info);
 103
 104         data_blob_free(&vuser->session_key);
 105
 106         DLIST_REMOVE(validated_users, vuser);
 107
 108         /* clear the vuid from the 'cache' on each connection, and
 109            from the vuid 'owner' of connections */
 110         conn_clear_vuid_cache(vuid);
 111
 112         SAFE_FREE(vuser->groups);
 113         TALLOC_FREE(vuser->nt_user_token);
 114
 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  In security=share mode we need to store the client workgroup, as that's
 410   what Vista uses for the NTLMv2 calculation.
 411 ****************************************************************************/
 412
 413 void add_session_workgroup(const char *workgroup)
 414 {
 415         if (session_workgroup) {
 416                 SAFE_FREE(session_workgroup);
 417         }
 418         session_workgroup = smb_xstrdup(workgroup);
 419 }
 420
 421 /****************************************************************************
 422  In security=share mode we need to return the client workgroup, as that's
 423   what Vista uses for the NTLMv2 calculation.
 424 ****************************************************************************/
 425
 426 const char *get_session_workgroup(void)
 427 {
 428         return session_workgroup;
 429 }
 430
 431 /****************************************************************************
 432  Check if a user is in a netgroup user list. If at first we don't succeed,
 433  try lower case.
 434 ****************************************************************************/
 435
 436 BOOL user_in_netgroup(const char *user, const char *ngname)
 437 {
 438 #ifdef HAVE_NETGROUP
 439         static char *mydomain = NULL;
 440         fstring lowercase_user;
 441
 442         if (mydomain == NULL)
 443                 yp_get_default_domain(&mydomain);
 444
 445         if(mydomain == NULL) {
 446                 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
 447         }
 448
 449         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 450                 user, mydomain?mydomain:"(ANY)", ngname));
 451
 452         if (innetgr(ngname, NULL, user, mydomain)) {
 453                 DEBUG(5,("user_in_netgroup: Found\n"));
 454                 return (True);
 455         } else {
 456
 457                 /*
 458                  * Ok, innetgr is case sensitive. Try once more with lowercase
 459                  * just in case. Attempt to fix #703. JRA.
 460                  */
 461
 462                 fstrcpy(lowercase_user, user);
 463                 strlower_m(lowercase_user);
 464
 465                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 466                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 467
 468                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 469                         DEBUG(5,("user_in_netgroup: Found\n"));
 470                         return (True);
 471                 }
 472         }
 473 #endif /* HAVE_NETGROUP */
 474         return False;
 475 }
 476
 477 /****************************************************************************
 478  Check if a user is in a user list - can check combinations of UNIX
 479  and netgroup lists.
 480 ****************************************************************************/
 481
 482 BOOL user_in_list(const char *user,const char **list)
 483 {
 484         if (!list || !*list)
 485                 return False;
 486
 487         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 488
 489         while (*list) {
 490
 491                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 492                           user, *list));
 493
 494                 /*
 495                  * Check raw username.
 496                  */
 497                 if (strequal(user, *list))
 498                         return(True);
 499
 500                 /*
 501                  * Now check to see if any combination
 502                  * of UNIX and netgroups has been specified.
 503                  */
 504
 505                 if(**list == '@') {
 506                         /*
 507                          * Old behaviour. Check netgroup list
 508                          * followed by UNIX list.
 509                          */
 510                         if(user_in_netgroup(user, *list +1))
 511                                 return True;
 512                         if(user_in_group(user, *list +1))
 513                                 return True;
 514                 } else if (**list == '+') {
 515
 516                         if((*(*list +1)) == '&') {
 517                                 /*
 518                                  * Search UNIX list followed by netgroup.
 519                                  */
 520                                 if(user_in_group(user, *list +2))
 521                                         return True;
 522                                 if(user_in_netgroup(user, *list +2))
 523                                         return True;
 524
 525                         } else {
 526
 527                                 /*
 528                                  * Just search UNIX list.
 529                                  */
 530
 531                                 if(user_in_group(user, *list +1))
 532                                         return True;
 533                         }
 534
 535                 } else if (**list == '&') {
 536
 537                         if(*(*list +1) == '+') {
 538                                 /*
 539                                  * Search netgroup list followed by UNIX list.
 540                                  */
 541                                 if(user_in_netgroup(user, *list +2))
 542                                         return True;
 543                                 if(user_in_group(user, *list +2))
 544                                         return True;
 545                         } else {
 546                                 /*
 547                                  * Just search netgroup list.
 548                                  */
 549                                 if(user_in_netgroup(user, *list +1))
 550                                         return True;
 551                         }
 552                 }
 553
 554                 list++;
 555         }
 556         return(False);
 557 }
 558
 559 /****************************************************************************
 560  Check if a username is valid.
 561 ****************************************************************************/
 562
 563 static BOOL user_ok(const char *user, int snum)
 564 {
 565         char **valid, **invalid;
 566         BOOL ret;
 567
 568         valid = invalid = NULL;
 569         ret = True;
 570
 571         if (lp_invalid_users(snum)) {
 572                 str_list_copy(&invalid, lp_invalid_users(snum));
 573                 if (invalid &&
 574                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 575
 576                         /* This is used in sec=share only, so no current user
 577                          * around to pass to str_list_sub_basic() */
 578
 579                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 580                                 ret = !user_in_list(user,
 581                                                     (const char **)invalid);
 582                         }
 583                 }
 584         }
 585         if (invalid)
 586                 str_list_free (&invalid);
 587
 588         if (ret && lp_valid_users(snum)) {
 589                 str_list_copy(&valid, lp_valid_users(snum));
 590                 if ( valid &&
 591                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 592
 593                         /* This is used in sec=share only, so no current user
 594                          * around to pass to str_list_sub_basic() */
 595
 596                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 597                                 ret = user_in_list(user, (const char **)valid);
 598                         }
 599                 }
 600         }
 601         if (valid)
 602                 str_list_free (&valid);
 603
 604         if (ret && lp_onlyuser(snum)) {
 605                 char **user_list = str_list_make (lp_username(snum), NULL);
 606                 if (user_list &&
 607                     str_list_substitute(user_list, "%S",
 608                                         lp_servicename(snum))) {
 609                         ret = user_in_list(user, (const char **)user_list);
 610                 }
 611                 if (user_list) str_list_free (&user_list);
 612         }
 613
 614         return(ret);
 615 }
 616
 617 /****************************************************************************
 618  Validate a group username entry. Return the username or NULL.
 619 ****************************************************************************/
 620
 621 static char *validate_group(char *group, DATA_BLOB password,int snum)
 622 {
 623 #ifdef HAVE_NETGROUP
 624         {
 625                 char *host, *user, *domain;
 626                 setnetgrent(group);
 627                 while (getnetgrent(&host, &user, &domain)) {
 628                         if (user) {
 629                                 if (user_ok(user, snum) &&
 630                                     password_ok(user,password)) {
 631                                         endnetgrent();
 632                                         return(user);
 633                                 }
 634                         }
 635                 }
 636                 endnetgrent();
 637         }
 638 #endif
 639
 640 #ifdef HAVE_GETGRENT
 641         {
 642                 struct group *gptr;
 643                 setgrent();
 644                 while ((gptr = (struct group *)getgrent())) {
 645                         if (strequal(gptr->gr_name,group))
 646                                 break;
 647                 }
 648
 649                 /*
 650                  * As user_ok can recurse doing a getgrent(), we must
 651                  * copy the member list into a pstring on the stack before
 652                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 653                  */
 654
 655                 if (gptr) {
 656                         pstring member_list;
 657                         char *member;
 658                         size_t copied_len = 0;
 659                         int i;
 660
 661                         *member_list = '\0';
 662                         member = member_list;
 663
 664                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 665                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 666                                 if(copied_len+member_len < sizeof(pstring)) {
 667
 668                                         DEBUG(10,("validate_group: = gr_mem = "
 669                                                   "%s\n", gptr->gr_mem[i]));
 670
 671                                         safe_strcpy(member, gptr->gr_mem[i],
 672                                                     sizeof(pstring) -
 673                                                     copied_len - 1);
 674                                         copied_len += member_len;
 675                                         member += copied_len;
 676                                 } else {
 677                                         *member = '\0';
 678                                 }
 679                         }
 680
 681                         endgrent();
 682
 683                         member = member_list;
 684                         while (*member) {
 685                                 static fstring name;
 686                                 fstrcpy(name,member);
 687                                 if (user_ok(name,snum) &&
 688                                     password_ok(name,password)) {
 689                                         endgrent();
 690                                         return(&name[0]);
 691                                 }
 692
 693                                 DEBUG(10,("validate_group = member = %s\n",
 694                                           member));
 695
 696                                 member += strlen(member) + 1;
 697                         }
 698                 } else {
 699                         endgrent();
 700                         return NULL;
 701                 }
 702         }
 703 #endif
 704         return(NULL);
 705 }
 706
 707 /****************************************************************************
 708  Check for authority to login to a service with a given username/password.
 709  Note this is *NOT* used when logging on using sessionsetup_and_X.
 710 ****************************************************************************/
 711
 712 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
 713                      BOOL *guest)
 714 {
 715         BOOL ok = False;
 716
 717 #ifdef DEBUG_PASSWORD
 718         DEBUG(100,("authorise_login: checking authorisation on "
 719                    "user=%s pass=%s\n", user,password.data));
 720 #endif
 721
 722         *guest = False;
 723
 724         /* there are several possibilities:
 725                 1) login as the given user with given password
 726                 2) login as a previously registered username with the given
 727                    password
 728                 3) login as a session list username with the given password
 729                 4) login as a previously validated user/password pair
 730                 5) login as the "user =" user with given password
 731                 6) login as the "user =" user with no password
 732                    (guest connection)
 733                 7) login as guest user with no password
 734
 735                 if the service is guest_only then steps 1 to 5 are skipped
 736         */
 737
 738         /* now check the list of session users */
 739         if (!ok) {
 740                 char *auser;
 741                 char *user_list = NULL;
 742
 743                 if ( session_userlist )
 744                         user_list = SMB_STRDUP(session_userlist);
 745                 else
 746                         user_list = SMB_STRDUP("");
 747
 748                 if (!user_list)
 749                         return(False);
 750
 751                 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
 752                      auser = strtok(NULL,LIST_SEP)) {
 753                         fstring user2;
 754                         fstrcpy(user2,auser);
 755                         if (!user_ok(user2,snum))
 756                                 continue;
 757
 758                         if (password_ok(user2,password)) {
 759                                 ok = True;
 760                                 fstrcpy(user,user2);
 761                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 762                                          "list username (%s) and given "
 763                                          "password ok\n", user));
 764                         }
 765                 }
 766
 767                 SAFE_FREE(user_list);
 768         }
 769
 770         /* check the user= fields and the given password */
 771         if (!ok && lp_username(snum)) {
 772                 char *auser;
 773                 pstring user_list;
 774                 pstrcpy(user_list,lp_username(snum));
 775
 776                 pstring_sub(user_list,"%S",lp_servicename(snum));
 777
 778                 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
 779                      auser = strtok(NULL,LIST_SEP)) {
 780                         if (*auser == '@') {
 781                                 auser = validate_group(auser+1,password,snum);
 782                                 if (auser) {
 783                                         ok = True;
 784                                         fstrcpy(user,auser);
 785                                         DEBUG(3,("authorise_login: ACCEPTED: "
 786                                                  "group username and given "
 787                                                  "password ok (%s)\n", user));
 788                                 }
 789                         } else {
 790                                 fstring user2;
 791                                 fstrcpy(user2,auser);
 792                                 if (user_ok(user2,snum) &&
 793                                     password_ok(user2,password)) {
 794                                         ok = True;
 795                                         fstrcpy(user,user2);
 796                                         DEBUG(3,("authorise_login: ACCEPTED: "
 797                                                  "user list username and "
 798                                                  "given password ok (%s)\n",
 799                                                  user));
 800                                 }
 801                         }
 802                 }
 803         }
 804
 805         /* check for a normal guest connection */
 806         if (!ok && GUEST_OK(snum)) {
 807                 fstring guestname;
 808                 fstrcpy(guestname,lp_guestaccount());
 809                 if (Get_Pwnam(guestname)) {
 810                         fstrcpy(user,guestname);
 811                         ok = True;
 812                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 813                                  "and guest ok (%s)\n", user));
 814                 } else {
 815                         DEBUG(0,("authorise_login: Invalid guest account "
 816                                  "%s??\n",guestname));
 817                 }
 818                 *guest = True;
 819         }
 820
 821         if (ok && !user_ok(user, snum)) {
 822                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 823                 ok = False;
 824         }
 825
 826         return(ok);
 827 }