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 /****************************************************************************
  33  Check if a uid has been validated, and return an pointer to the user_struct
  34  if it has. NULL if not. vuid is biased by an offset. This allows us to
  35  tell random client vuid's (normally zero) from valid vuids.
  36 ****************************************************************************/
  37
  38 user_struct *get_valid_user_struct(uint16 vuid)
  39 {
  40         user_struct *usp;
  41         int count=0;
  42
  43         if (vuid == UID_FIELD_INVALID)
  44                 return NULL;
  45
  46         for (usp=validated_users;usp;usp=usp->next,count++) {
  47                 if (vuid == usp->vuid && usp->server_info) {
  48                         if (count > 10) {
  49                                 DLIST_PROMOTE(validated_users, usp);
  50                         }
  51                         return usp;
  52                 }
  53         }
  54
  55         return NULL;
  56 }
  57
  58 /****************************************************************************
  59  Get the user struct of a partial NTLMSSP login
  60 ****************************************************************************/
  61
  62 user_struct *get_partial_auth_user_struct(uint16 vuid)
  63 {
  64         user_struct *usp;
  65         int count=0;
  66
  67         if (vuid == UID_FIELD_INVALID)
  68                 return NULL;
  69
  70         for (usp=validated_users;usp;usp=usp->next,count++) {
  71                 if (vuid == usp->vuid && !usp->server_info) {
  72                         if (count > 10) {
  73                                 DLIST_PROMOTE(validated_users, usp);
  74                         }
  75                         return usp;
  76                 }
  77         }
  78
  79         return NULL;
  80 }
  81
  82 /****************************************************************************
  83  Invalidate a uid.
  84 ****************************************************************************/
  85
  86 void invalidate_vuid(uint16 vuid)
  87 {
  88         user_struct *vuser = get_valid_user_struct(vuid);
  89
  90         if (vuser == NULL)
  91                 return;
  92
  93         SAFE_FREE(vuser->homedir);
  94         SAFE_FREE(vuser->unix_homedir);
  95         SAFE_FREE(vuser->logon_script);
  96
  97         session_yield(vuser);
  98         SAFE_FREE(vuser->session_keystr);
  99
 100         TALLOC_FREE(vuser->server_info);
 101
 102         data_blob_free(&vuser->session_key);
 103
 104         DLIST_REMOVE(validated_users, vuser);
 105
 106         /* clear the vuid from the 'cache' on each connection, and
 107            from the vuid 'owner' of connections */
 108         conn_clear_vuid_cache(vuid);
 109
 110         SAFE_FREE(vuser->groups);
 111         TALLOC_FREE(vuser->nt_user_token);
 112         SAFE_FREE(vuser);
 113         num_validated_vuids--;
 114 }
 115
 116 /****************************************************************************
 117  Invalidate all vuid entries for this process.
 118 ****************************************************************************/
 119
 120 void invalidate_all_vuids(void)
 121 {
 122         user_struct *usp, *next=NULL;
 123
 124         for (usp=validated_users;usp;usp=next) {
 125                 next = usp->next;
 126
 127                 invalidate_vuid(usp->vuid);
 128         }
 129 }
 130
 131 /**
 132  *  register that a valid login has been performed, establish 'session'.
 133  *  @param server_info The token returned from the authentication process.
 134  *   (now 'owned' by register_vuid)
 135  *
 136  *  @param session_key The User session key for the login session (now also
 137  *  'owned' by register_vuid)
 138  *
 139  *  @param respose_blob The NT challenge-response, if available.  (May be
 140  *  freed after this call)
 141  *
 142  *  @param smb_name The untranslated name of the user
 143  *
 144  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 145  *   tell random client vuid's (normally zero) from valid vuids.)
 146  *
 147  */
 148
 149 int register_vuid(auth_serversupplied_info *server_info,
 150                   DATA_BLOB session_key, DATA_BLOB response_blob,
 151                   const char *smb_name)
 152 {
 153         user_struct *vuser = NULL;
 154
 155         /* Paranoia check. */
 156         if(lp_security() == SEC_SHARE) {
 157                 smb_panic("Tried to register uid in security=share\n");
 158         }
 159
 160         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 161         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 162                 data_blob_free(&session_key);
 163                 return UID_FIELD_INVALID;
 164         }
 165
 166         if((vuser = SMB_MALLOC_P(user_struct)) == NULL) {
 167                 DEBUG(0,("Failed to malloc users struct!\n"));
 168                 data_blob_free(&session_key);
 169                 return UID_FIELD_INVALID;
 170         }
 171
 172         ZERO_STRUCTP(vuser);
 173
 174         /* Allocate a free vuid. Yes this is a linear search... :-) */
 175         while( get_valid_user_struct(next_vuid) != NULL ) {
 176                 next_vuid++;
 177                 /* Check for vuid wrap. */
 178                 if (next_vuid == UID_FIELD_INVALID)
 179                         next_vuid = VUID_OFFSET;
 180         }
 181
 182         DEBUG(10,("register_vuid: allocated vuid = %u\n",
 183                   (unsigned int)next_vuid ));
 184
 185         vuser->vuid = next_vuid;
 186
 187         if (!server_info) {
 188                 /*
 189                  * This happens in an unfinished NTLMSSP session setup. We
 190                  * need to allocate a vuid between the first and second calls
 191                  * to NTLMSSP.
 192                  */
 193                 next_vuid++;
 194                 num_validated_vuids++;
 195
 196                 vuser->server_info = NULL;
 197
 198                 DLIST_ADD(validated_users, vuser);
 199
 200                 return vuser->vuid;
 201         }
 202
 203         /* the next functions should be done by a SID mapping system (SMS) as
 204          * the new real sam db won't have reference to unix uids or gids
 205          */
 206
 207         vuser->uid = server_info->uid;
 208         vuser->gid = server_info->gid;
 209
 210         vuser->n_groups = server_info->n_groups;
 211         if (vuser->n_groups) {
 212                 if (!(vuser->groups = (gid_t *)memdup(server_info->groups,
 213                                                       sizeof(gid_t) *
 214                                                       vuser->n_groups))) {
 215                         DEBUG(0,("register_vuid: failed to memdup "
 216                                  "vuser->groups\n"));
 217                         data_blob_free(&session_key);
 218                         free(vuser);
 219                         TALLOC_FREE(server_info);
 220                         return UID_FIELD_INVALID;
 221                 }
 222         }
 223
 224         vuser->guest = server_info->guest;
 225         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 226
 227         /* This is a potentially untrusted username */
 228         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 229                      sizeof(vuser->user.smb_name));
 230
 231         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 232         fstrcpy(vuser->user.full_name,
 233                 pdb_get_fullname(server_info->sam_account));
 234
 235         {
 236                 /* Keep the homedir handy */
 237                 const char *homedir =
 238                         pdb_get_homedir(server_info->sam_account);
 239                 const char *logon_script =
 240                         pdb_get_logon_script(server_info->sam_account);
 241
 242                 if (!IS_SAM_DEFAULT(server_info->sam_account,
 243                                     PDB_UNIXHOMEDIR)) {
 244                         const char *unix_homedir =
 245                                 pdb_get_unix_homedir(server_info->sam_account);
 246                         if (unix_homedir) {
 247                                 vuser->unix_homedir =
 248                                         smb_xstrdup(unix_homedir);
 249                         }
 250                 } else {
 251                         struct passwd *passwd =
 252                                 getpwnam_alloc(NULL, vuser->user.unix_name);
 253                         if (passwd) {
 254                                 vuser->unix_homedir =
 255                                         smb_xstrdup(passwd->pw_dir);
 256                                 TALLOC_FREE(passwd);
 257                         }
 258                 }
 259
 260                 if (homedir) {
 261                         vuser->homedir = smb_xstrdup(homedir);
 262                 }
 263                 if (logon_script) {
 264                         vuser->logon_script = smb_xstrdup(logon_script);
 265                 }
 266         }
 267
 268         vuser->session_key = session_key;
 269
 270         DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
 271                   (unsigned int)vuser->uid,
 272                   (unsigned int)vuser->gid,
 273                   vuser->user.unix_name, vuser->user.smb_name,
 274                   vuser->user.domain, vuser->guest ));
 275
 276         DEBUG(3, ("User name: %s\tReal name: %s\n", vuser->user.unix_name,
 277                   vuser->user.full_name));
 278
 279         if (server_info->ptok) {
 280                 vuser->nt_user_token = dup_nt_token(NULL, server_info->ptok);
 281         } else {
 282                 DEBUG(1, ("server_info does not contain a user_token - "
 283                           "cannot continue\n"));
 284                 TALLOC_FREE(server_info);
 285                 data_blob_free(&session_key);
 286                 SAFE_FREE(vuser->homedir);
 287                 SAFE_FREE(vuser->unix_homedir);
 288                 SAFE_FREE(vuser->logon_script);
 289
 290                 SAFE_FREE(vuser);
 291                 return UID_FIELD_INVALID;
 292         }
 293
 294         /* use this to keep tabs on all our info from the authentication */
 295         vuser->server_info = server_info;
 296
 297         DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
 298                  (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
 299
 300         next_vuid++;
 301         num_validated_vuids++;
 302
 303         DLIST_ADD(validated_users, vuser);
 304
 305         if (!session_claim(vuser)) {
 306                 DEBUG(1, ("Failed to claim session for vuid=%d\n",
 307                           vuser->vuid));
 308                 invalidate_vuid(vuser->vuid);
 309                 return UID_FIELD_INVALID;
 310         }
 311
 312         /* Register a home dir service for this user iff
 313
 314            (a) This is not a guest connection,
 315            (b) we have a home directory defined
 316            (c) there s not an existing static share by that name
 317
 318            If a share exists by this name (autoloaded or not) reuse it . */
 319
 320         vuser->homes_snum = -1;
 321
 322         if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir))
 323         {
 324                 int servicenumber = lp_servicenumber(vuser->user.unix_name);
 325
 326                 if ( servicenumber == -1 ) {
 327                         DEBUG(3, ("Adding homes service for user '%s' using "
 328                                   "home directory: '%s'\n",
 329                                 vuser->user.unix_name, vuser->unix_homedir));
 330                         vuser->homes_snum =
 331                                 add_home_service(vuser->user.unix_name,
 332                                                  vuser->user.unix_name,
 333                                                  vuser->unix_homedir);
 334                 } else {
 335                         DEBUG(3, ("Using static (or previously created) "
 336                                   "service for user '%s'; path = '%s'\n",
 337                                   vuser->user.unix_name,
 338                                   lp_pathname(servicenumber) ));
 339                         vuser->homes_snum = servicenumber;
 340                 }
 341         }
 342
 343         if (srv_is_signing_negotiated() && !vuser->guest &&
 344             !srv_signing_started()) {
 345                 /* Try and turn on server signing on the first non-guest
 346                  * sessionsetup. */
 347                 srv_set_signing(vuser->session_key, response_blob);
 348         }
 349
 350         /* fill in the current_user_info struct */
 351         set_current_user_info( &vuser->user );
 352
 353
 354         return vuser->vuid;
 355 }
 356
 357 /****************************************************************************
 358  Add a name to the session users list.
 359 ****************************************************************************/
 360
 361 void add_session_user(const char *user)
 362 {
 363         fstring suser;
 364         struct passwd *passwd;
 365
 366         if (!(passwd = Get_Pwnam(user)))
 367                 return;
 368
 369         fstrcpy(suser,passwd->pw_name);
 370
 371         if(!*suser)
 372                 return;
 373
 374         if( session_userlist && in_list(suser,session_userlist,False) )
 375                 return;
 376
 377         if( !session_userlist ||
 378             (strlen(suser) + strlen(session_userlist) + 2 >=
 379              len_session_userlist) ) {
 380                 char *newlist;
 381
 382                 if (len_session_userlist > 128 * PSTRING_LEN) {
 383                         DEBUG(3,("add_session_user: session userlist already "
 384                                  "too large.\n"));
 385                         return;
 386                 }
 387                 newlist = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
 388                         session_userlist,
 389                         len_session_userlist + PSTRING_LEN );
 390                 if( newlist == NULL ) {
 391                         DEBUG(1,("Unable to resize session_userlist\n"));
 392                         return;
 393                 }
 394                 if (!session_userlist) {
 395                         *newlist = '\0';
 396                 }
 397                 session_userlist = newlist;
 398                 len_session_userlist += PSTRING_LEN;
 399         }
 400
 401         safe_strcat(session_userlist," ",len_session_userlist-1);
 402         safe_strcat(session_userlist,suser,len_session_userlist-1);
 403 }
 404
 405 /****************************************************************************
 406  Check if a user is in a netgroup user list. If at first we don't succeed,
 407  try lower case.
 408 ****************************************************************************/
 409
 410 BOOL user_in_netgroup(const char *user, const char *ngname)
 411 {
 412 #ifdef HAVE_NETGROUP
 413         static char *mydomain = NULL;
 414         fstring lowercase_user;
 415
 416         if (mydomain == NULL)
 417                 yp_get_default_domain(&mydomain);
 418
 419         if(mydomain == NULL) {
 420                 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
 421         }
 422
 423         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 424                 user, mydomain?mydomain:"(ANY)", ngname));
 425
 426         if (innetgr(ngname, NULL, user, mydomain)) {
 427                 DEBUG(5,("user_in_netgroup: Found\n"));
 428                 return (True);
 429         } else {
 430
 431                 /*
 432                  * Ok, innetgr is case sensitive. Try once more with lowercase
 433                  * just in case. Attempt to fix #703. JRA.
 434                  */
 435
 436                 fstrcpy(lowercase_user, user);
 437                 strlower_m(lowercase_user);
 438
 439                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 440                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 441
 442                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 443                         DEBUG(5,("user_in_netgroup: Found\n"));
 444                         return (True);
 445                 }
 446         }
 447 #endif /* HAVE_NETGROUP */
 448         return False;
 449 }
 450
 451 /****************************************************************************
 452  Check if a user is in a user list - can check combinations of UNIX
 453  and netgroup lists.
 454 ****************************************************************************/
 455
 456 BOOL user_in_list(const char *user,const char **list)
 457 {
 458         if (!list || !*list)
 459                 return False;
 460
 461         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 462
 463         while (*list) {
 464
 465                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 466                           user, *list));
 467
 468                 /*
 469                  * Check raw username.
 470                  */
 471                 if (strequal(user, *list))
 472                         return(True);
 473
 474                 /*
 475                  * Now check to see if any combination
 476                  * of UNIX and netgroups has been specified.
 477                  */
 478
 479                 if(**list == '@') {
 480                         /*
 481                          * Old behaviour. Check netgroup list
 482                          * followed by UNIX list.
 483                          */
 484                         if(user_in_netgroup(user, *list +1))
 485                                 return True;
 486                         if(user_in_group(user, *list +1))
 487                                 return True;
 488                 } else if (**list == '+') {
 489
 490                         if((*(*list +1)) == '&') {
 491                                 /*
 492                                  * Search UNIX list followed by netgroup.
 493                                  */
 494                                 if(user_in_group(user, *list +2))
 495                                         return True;
 496                                 if(user_in_netgroup(user, *list +2))
 497                                         return True;
 498
 499                         } else {
 500
 501                                 /*
 502                                  * Just search UNIX list.
 503                                  */
 504
 505                                 if(user_in_group(user, *list +1))
 506                                         return True;
 507                         }
 508
 509                 } else if (**list == '&') {
 510
 511                         if(*(*list +1) == '+') {
 512                                 /*
 513                                  * Search netgroup list followed by UNIX list.
 514                                  */
 515                                 if(user_in_netgroup(user, *list +2))
 516                                         return True;
 517                                 if(user_in_group(user, *list +2))
 518                                         return True;
 519                         } else {
 520                                 /*
 521                                  * Just search netgroup list.
 522                                  */
 523                                 if(user_in_netgroup(user, *list +1))
 524                                         return True;
 525                         }
 526                 }
 527
 528                 list++;
 529         }
 530         return(False);
 531 }
 532
 533 /****************************************************************************
 534  Check if a username is valid.
 535 ****************************************************************************/
 536
 537 static BOOL user_ok(const char *user, int snum)
 538 {
 539         char **valid, **invalid;
 540         BOOL ret;
 541
 542         valid = invalid = NULL;
 543         ret = True;
 544
 545         if (lp_invalid_users(snum)) {
 546                 str_list_copy(&invalid, lp_invalid_users(snum));
 547                 if (invalid &&
 548                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 549
 550                         /* This is used in sec=share only, so no current user
 551                          * around to pass to str_list_sub_basic() */
 552
 553                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 554                                 ret = !user_in_list(user,
 555                                                     (const char **)invalid);
 556                         }
 557                 }
 558         }
 559         if (invalid)
 560                 str_list_free (&invalid);
 561
 562         if (ret && lp_valid_users(snum)) {
 563                 str_list_copy(&valid, lp_valid_users(snum));
 564                 if ( valid &&
 565                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 566
 567                         /* This is used in sec=share only, so no current user
 568                          * around to pass to str_list_sub_basic() */
 569
 570                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 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 }