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 /* 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         SAFE_FREE(vuser);
 115         num_validated_vuids--;
 116 }
 117
 118 /****************************************************************************
 119  Invalidate all vuid entries for this process.
 120 ****************************************************************************/
 121
 122 void invalidate_all_vuids(void)
 123 {
 124         user_struct *usp, *next=NULL;
 125
 126         for (usp=validated_users;usp;usp=next) {
 127                 next = usp->next;
 128
 129                 invalidate_vuid(usp->vuid);
 130         }
 131 }
 132
 133 /**
 134  *  register that a valid login has been performed, establish 'session'.
 135  *  @param server_info The token returned from the authentication process.
 136  *   (now 'owned' by register_vuid)
 137  *
 138  *  @param session_key The User session key for the login session (now also
 139  *  'owned' by register_vuid)
 140  *
 141  *  @param respose_blob The NT challenge-response, if available.  (May be
 142  *  freed after this call)
 143  *
 144  *  @param smb_name The untranslated name of the user
 145  *
 146  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 147  *   tell random client vuid's (normally zero) from valid vuids.)
 148  *
 149  */
 150
 151 int register_vuid(auth_serversupplied_info *server_info,
 152                   DATA_BLOB session_key, DATA_BLOB response_blob,
 153                   const char *smb_name)
 154 {
 155         user_struct *vuser = NULL;
 156
 157         /* Paranoia check. */
 158         if(lp_security() == SEC_SHARE) {
 159                 smb_panic("Tried to register uid in security=share\n");
 160         }
 161
 162         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 163         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 164                 data_blob_free(&session_key);
 165                 return UID_FIELD_INVALID;
 166         }
 167
 168         if((vuser = SMB_MALLOC_P(user_struct)) == NULL) {
 169                 DEBUG(0,("Failed to malloc users struct!\n"));
 170                 data_blob_free(&session_key);
 171                 return UID_FIELD_INVALID;
 172         }
 173
 174         ZERO_STRUCTP(vuser);
 175
 176         /* Allocate a free vuid. Yes this is a linear search... :-) */
 177         while( get_valid_user_struct(next_vuid) != NULL ) {
 178                 next_vuid++;
 179                 /* Check for vuid wrap. */
 180                 if (next_vuid == UID_FIELD_INVALID)
 181                         next_vuid = VUID_OFFSET;
 182         }
 183
 184         DEBUG(10,("register_vuid: allocated vuid = %u\n",
 185                   (unsigned int)next_vuid ));
 186
 187         vuser->vuid = next_vuid;
 188
 189         if (!server_info) {
 190                 /*
 191                  * This happens in an unfinished NTLMSSP session setup. We
 192                  * need to allocate a vuid between the first and second calls
 193                  * to NTLMSSP.
 194                  */
 195                 next_vuid++;
 196                 num_validated_vuids++;
 197
 198                 vuser->server_info = NULL;
 199
 200                 DLIST_ADD(validated_users, vuser);
 201
 202                 return vuser->vuid;
 203         }
 204
 205         /* the next functions should be done by a SID mapping system (SMS) as
 206          * the new real sam db won't have reference to unix uids or gids
 207          */
 208
 209         vuser->uid = server_info->uid;
 210         vuser->gid = server_info->gid;
 211
 212         vuser->n_groups = server_info->n_groups;
 213         if (vuser->n_groups) {
 214                 if (!(vuser->groups = (gid_t *)memdup(server_info->groups,
 215                                                       sizeof(gid_t) *
 216                                                       vuser->n_groups))) {
 217                         DEBUG(0,("register_vuid: failed to memdup "
 218                                  "vuser->groups\n"));
 219                         data_blob_free(&session_key);
 220                         free(vuser);
 221                         TALLOC_FREE(server_info);
 222                         return UID_FIELD_INVALID;
 223                 }
 224         }
 225
 226         vuser->guest = server_info->guest;
 227         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 228
 229         /* This is a potentially untrusted username */
 230         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 231                      sizeof(vuser->user.smb_name));
 232
 233         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 234         fstrcpy(vuser->user.full_name,
 235                 pdb_get_fullname(server_info->sam_account));
 236
 237         {
 238                 /* Keep the homedir handy */
 239                 const char *homedir =
 240                         pdb_get_homedir(server_info->sam_account);
 241                 const char *logon_script =
 242                         pdb_get_logon_script(server_info->sam_account);
 243
 244                 if (!IS_SAM_DEFAULT(server_info->sam_account,
 245                                     PDB_UNIXHOMEDIR)) {
 246                         const char *unix_homedir =
 247                                 pdb_get_unix_homedir(server_info->sam_account);
 248                         if (unix_homedir) {
 249                                 vuser->unix_homedir =
 250                                         smb_xstrdup(unix_homedir);
 251                         }
 252                 } else {
 253                         struct passwd *passwd =
 254                                 getpwnam_alloc(NULL, vuser->user.unix_name);
 255                         if (passwd) {
 256                                 vuser->unix_homedir =
 257                                         smb_xstrdup(passwd->pw_dir);
 258                                 TALLOC_FREE(passwd);
 259                         }
 260                 }
 261
 262                 if (homedir) {
 263                         vuser->homedir = smb_xstrdup(homedir);
 264                 }
 265                 if (logon_script) {
 266                         vuser->logon_script = smb_xstrdup(logon_script);
 267                 }
 268         }
 269
 270         vuser->session_key = session_key;
 271
 272         DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
 273                   (unsigned int)vuser->uid,
 274                   (unsigned int)vuser->gid,
 275                   vuser->user.unix_name, vuser->user.smb_name,
 276                   vuser->user.domain, vuser->guest ));
 277
 278         DEBUG(3, ("User name: %s\tReal name: %s\n", vuser->user.unix_name,
 279                   vuser->user.full_name));
 280
 281         if (server_info->ptok) {
 282                 vuser->nt_user_token = dup_nt_token(NULL, server_info->ptok);
 283         } else {
 284                 DEBUG(1, ("server_info does not contain a user_token - "
 285                           "cannot continue\n"));
 286                 TALLOC_FREE(server_info);
 287                 data_blob_free(&session_key);
 288                 SAFE_FREE(vuser->homedir);
 289                 SAFE_FREE(vuser->unix_homedir);
 290                 SAFE_FREE(vuser->logon_script);
 291
 292                 SAFE_FREE(vuser);
 293                 return UID_FIELD_INVALID;
 294         }
 295
 296         /* use this to keep tabs on all our info from the authentication */
 297         vuser->server_info = server_info;
 298
 299         DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
 300                  (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
 301
 302         next_vuid++;
 303         num_validated_vuids++;
 304
 305         DLIST_ADD(validated_users, vuser);
 306
 307         if (!session_claim(vuser)) {
 308                 DEBUG(1, ("Failed to claim session for vuid=%d\n",
 309                           vuser->vuid));
 310                 invalidate_vuid(vuser->vuid);
 311                 return UID_FIELD_INVALID;
 312         }
 313
 314         /* Register a home dir service for this user iff
 315
 316            (a) This is not a guest connection,
 317            (b) we have a home directory defined
 318            (c) there s not an existing static share by that name
 319
 320            If a share exists by this name (autoloaded or not) reuse it . */
 321
 322         vuser->homes_snum = -1;
 323
 324         if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir))
 325         {
 326                 int servicenumber = lp_servicenumber(vuser->user.unix_name);
 327
 328                 if ( servicenumber == -1 ) {
 329                         DEBUG(3, ("Adding homes service for user '%s' using "
 330                                   "home directory: '%s'\n",
 331                                 vuser->user.unix_name, vuser->unix_homedir));
 332                         vuser->homes_snum =
 333                                 add_home_service(vuser->user.unix_name,
 334                                                  vuser->user.unix_name,
 335                                                  vuser->unix_homedir);
 336                 } else {
 337                         DEBUG(3, ("Using static (or previously created) "
 338                                   "service for user '%s'; path = '%s'\n",
 339                                   vuser->user.unix_name,
 340                                   lp_pathname(servicenumber) ));
 341                         vuser->homes_snum = servicenumber;
 342                 }
 343         }
 344
 345         if (srv_is_signing_negotiated() && !vuser->guest &&
 346             !srv_signing_started()) {
 347                 /* Try and turn on server signing on the first non-guest
 348                  * sessionsetup. */
 349                 srv_set_signing(vuser->session_key, response_blob);
 350         }
 351
 352         /* fill in the current_user_info struct */
 353         set_current_user_info( &vuser->user );
 354
 355
 356         return vuser->vuid;
 357 }
 358
 359 /****************************************************************************
 360  Add a name to the session users list.
 361 ****************************************************************************/
 362
 363 void add_session_user(const char *user)
 364 {
 365         fstring suser;
 366         struct passwd *passwd;
 367
 368         if (!(passwd = Get_Pwnam(user)))
 369                 return;
 370
 371         fstrcpy(suser,passwd->pw_name);
 372
 373         if(!*suser)
 374                 return;
 375
 376         if( session_userlist && in_list(suser,session_userlist,False) )
 377                 return;
 378
 379         if( !session_userlist ||
 380             (strlen(suser) + strlen(session_userlist) + 2 >=
 381              len_session_userlist) ) {
 382                 char *newlist;
 383
 384                 if (len_session_userlist > 128 * PSTRING_LEN) {
 385                         DEBUG(3,("add_session_user: session userlist already "
 386                                  "too large.\n"));
 387                         return;
 388                 }
 389                 newlist = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
 390                         session_userlist,
 391                         len_session_userlist + PSTRING_LEN );
 392                 if( newlist == NULL ) {
 393                         DEBUG(1,("Unable to resize session_userlist\n"));
 394                         return;
 395                 }
 396                 if (!session_userlist) {
 397                         *newlist = '\0';
 398                 }
 399                 session_userlist = newlist;
 400                 len_session_userlist += PSTRING_LEN;
 401         }
 402
 403         safe_strcat(session_userlist," ",len_session_userlist-1);
 404         safe_strcat(session_userlist,suser,len_session_userlist-1);
 405 }
 406
 407 /****************************************************************************
 408  In security=share mode we need to store the client workgroup, as that's
 409   what Vista uses for the NTLMv2 calculation.
 410 ****************************************************************************/
 411
 412 void add_session_workgroup(const char *workgroup)
 413 {
 414         if (session_workgroup) {
 415                 SAFE_FREE(session_workgroup);
 416         }
 417         session_workgroup = smb_xstrdup(workgroup);
 418 }
 419
 420 /****************************************************************************
 421  In security=share mode we need to return the client workgroup, as that's
 422   what Vista uses for the NTLMv2 calculation.
 423 ****************************************************************************/
 424
 425 const char *get_session_workgroup(void)
 426 {
 427         return session_workgroup;
 428 }
 429
 430 /****************************************************************************
 431  Check if a user is in a netgroup user list. If at first we don't succeed,
 432  try lower case.
 433 ****************************************************************************/
 434
 435 BOOL user_in_netgroup(const char *user, const char *ngname)
 436 {
 437 #ifdef HAVE_NETGROUP
 438         static char *mydomain = NULL;
 439         fstring lowercase_user;
 440
 441         if (mydomain == NULL)
 442                 yp_get_default_domain(&mydomain);
 443
 444         if(mydomain == NULL) {
 445                 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
 446         }
 447
 448         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 449                 user, mydomain?mydomain:"(ANY)", ngname));
 450
 451         if (innetgr(ngname, NULL, user, mydomain)) {
 452                 DEBUG(5,("user_in_netgroup: Found\n"));
 453                 return (True);
 454         } else {
 455
 456                 /*
 457                  * Ok, innetgr is case sensitive. Try once more with lowercase
 458                  * just in case. Attempt to fix #703. JRA.
 459                  */
 460
 461                 fstrcpy(lowercase_user, user);
 462                 strlower_m(lowercase_user);
 463
 464                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 465                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 466
 467                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 468                         DEBUG(5,("user_in_netgroup: Found\n"));
 469                         return (True);
 470                 }
 471         }
 472 #endif /* HAVE_NETGROUP */
 473         return False;
 474 }
 475
 476 /****************************************************************************
 477  Check if a user is in a user list - can check combinations of UNIX
 478  and netgroup lists.
 479 ****************************************************************************/
 480
 481 BOOL user_in_list(const char *user,const char **list)
 482 {
 483         if (!list || !*list)
 484                 return False;
 485
 486         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 487
 488         while (*list) {
 489
 490                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 491                           user, *list));
 492
 493                 /*
 494                  * Check raw username.
 495                  */
 496                 if (strequal(user, *list))
 497                         return(True);
 498
 499                 /*
 500                  * Now check to see if any combination
 501                  * of UNIX and netgroups has been specified.
 502                  */
 503
 504                 if(**list == '@') {
 505                         /*
 506                          * Old behaviour. Check netgroup list
 507                          * followed by UNIX list.
 508                          */
 509                         if(user_in_netgroup(user, *list +1))
 510                                 return True;
 511                         if(user_in_group(user, *list +1))
 512                                 return True;
 513                 } else if (**list == '+') {
 514
 515                         if((*(*list +1)) == '&') {
 516                                 /*
 517                                  * Search UNIX list followed by netgroup.
 518                                  */
 519                                 if(user_in_group(user, *list +2))
 520                                         return True;
 521                                 if(user_in_netgroup(user, *list +2))
 522                                         return True;
 523
 524                         } else {
 525
 526                                 /*
 527                                  * Just search UNIX list.
 528                                  */
 529
 530                                 if(user_in_group(user, *list +1))
 531                                         return True;
 532                         }
 533
 534                 } else if (**list == '&') {
 535
 536                         if(*(*list +1) == '+') {
 537                                 /*
 538                                  * Search netgroup list followed by UNIX list.
 539                                  */
 540                                 if(user_in_netgroup(user, *list +2))
 541                                         return True;
 542                                 if(user_in_group(user, *list +2))
 543                                         return True;
 544                         } else {
 545                                 /*
 546                                  * Just search netgroup list.
 547                                  */
 548                                 if(user_in_netgroup(user, *list +1))
 549                                         return True;
 550                         }
 551                 }
 552
 553                 list++;
 554         }
 555         return(False);
 556 }
 557
 558 /****************************************************************************
 559  Check if a username is valid.
 560 ****************************************************************************/
 561
 562 static BOOL user_ok(const char *user, int snum)
 563 {
 564         char **valid, **invalid;
 565         BOOL ret;
 566
 567         valid = invalid = NULL;
 568         ret = True;
 569
 570         if (lp_invalid_users(snum)) {
 571                 str_list_copy(&invalid, lp_invalid_users(snum));
 572                 if (invalid &&
 573                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 574
 575                         /* This is used in sec=share only, so no current user
 576                          * around to pass to str_list_sub_basic() */
 577
 578                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 579                                 ret = !user_in_list(user,
 580                                                     (const char **)invalid);
 581                         }
 582                 }
 583         }
 584         if (invalid)
 585                 str_list_free (&invalid);
 586
 587         if (ret && lp_valid_users(snum)) {
 588                 str_list_copy(&valid, lp_valid_users(snum));
 589                 if ( valid &&
 590                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 591
 592                         /* This is used in sec=share only, so no current user
 593                          * around to pass to str_list_sub_basic() */
 594
 595                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 596                                 ret = user_in_list(user, (const char **)valid);
 597                         }
 598                 }
 599         }
 600         if (valid)
 601                 str_list_free (&valid);
 602
 603         if (ret && lp_onlyuser(snum)) {
 604                 char **user_list = str_list_make (lp_username(snum), NULL);
 605                 if (user_list &&
 606                     str_list_substitute(user_list, "%S",
 607                                         lp_servicename(snum))) {
 608                         ret = user_in_list(user, (const char **)user_list);
 609                 }
 610                 if (user_list) str_list_free (&user_list);
 611         }
 612
 613         return(ret);
 614 }
 615
 616 /****************************************************************************
 617  Validate a group username entry. Return the username or NULL.
 618 ****************************************************************************/
 619
 620 static char *validate_group(char *group, DATA_BLOB password,int snum)
 621 {
 622 #ifdef HAVE_NETGROUP
 623         {
 624                 char *host, *user, *domain;
 625                 setnetgrent(group);
 626                 while (getnetgrent(&host, &user, &domain)) {
 627                         if (user) {
 628                                 if (user_ok(user, snum) &&
 629                                     password_ok(user,password)) {
 630                                         endnetgrent();
 631                                         return(user);
 632                                 }
 633                         }
 634                 }
 635                 endnetgrent();
 636         }
 637 #endif
 638
 639 #ifdef HAVE_GETGRENT
 640         {
 641                 struct group *gptr;
 642                 setgrent();
 643                 while ((gptr = (struct group *)getgrent())) {
 644                         if (strequal(gptr->gr_name,group))
 645                                 break;
 646                 }
 647
 648                 /*
 649                  * As user_ok can recurse doing a getgrent(), we must
 650                  * copy the member list into a pstring on the stack before
 651                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 652                  */
 653
 654                 if (gptr) {
 655                         pstring member_list;
 656                         char *member;
 657                         size_t copied_len = 0;
 658                         int i;
 659
 660                         *member_list = '\0';
 661                         member = member_list;
 662
 663                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 664                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 665                                 if(copied_len+member_len < sizeof(pstring)) {
 666
 667                                         DEBUG(10,("validate_group: = gr_mem = "
 668                                                   "%s\n", gptr->gr_mem[i]));
 669
 670                                         safe_strcpy(member, gptr->gr_mem[i],
 671                                                     sizeof(pstring) -
 672                                                     copied_len - 1);
 673                                         copied_len += member_len;
 674                                         member += copied_len;
 675                                 } else {
 676                                         *member = '\0';
 677                                 }
 678                         }
 679
 680                         endgrent();
 681
 682                         member = member_list;
 683                         while (*member) {
 684                                 static fstring name;
 685                                 fstrcpy(name,member);
 686                                 if (user_ok(name,snum) &&
 687                                     password_ok(name,password)) {
 688                                         endgrent();
 689                                         return(&name[0]);
 690                                 }
 691
 692                                 DEBUG(10,("validate_group = member = %s\n",
 693                                           member));
 694
 695                                 member += strlen(member) + 1;
 696                         }
 697                 } else {
 698                         endgrent();
 699                         return NULL;
 700                 }
 701         }
 702 #endif
 703         return(NULL);
 704 }
 705
 706 /****************************************************************************
 707  Check for authority to login to a service with a given username/password.
 708  Note this is *NOT* used when logging on using sessionsetup_and_X.
 709 ****************************************************************************/
 710
 711 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
 712                      BOOL *guest)
 713 {
 714         BOOL ok = False;
 715
 716 #ifdef DEBUG_PASSWORD
 717         DEBUG(100,("authorise_login: checking authorisation on "
 718                    "user=%s pass=%s\n", user,password.data));
 719 #endif
 720
 721         *guest = False;
 722
 723         /* there are several possibilities:
 724                 1) login as the given user with given password
 725                 2) login as a previously registered username with the given
 726                    password
 727                 3) login as a session list username with the given password
 728                 4) login as a previously validated user/password pair
 729                 5) login as the "user =" user with given password
 730                 6) login as the "user =" user with no password
 731                    (guest connection)
 732                 7) login as guest user with no password
 733
 734                 if the service is guest_only then steps 1 to 5 are skipped
 735         */
 736
 737         /* now check the list of session users */
 738         if (!ok) {
 739                 char *auser;
 740                 char *user_list = NULL;
 741
 742                 if ( session_userlist )
 743                         user_list = SMB_STRDUP(session_userlist);
 744                 else
 745                         user_list = SMB_STRDUP("");
 746
 747                 if (!user_list)
 748                         return(False);
 749
 750                 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
 751                      auser = strtok(NULL,LIST_SEP)) {
 752                         fstring user2;
 753                         fstrcpy(user2,auser);
 754                         if (!user_ok(user2,snum))
 755                                 continue;
 756
 757                         if (password_ok(user2,password)) {
 758                                 ok = True;
 759                                 fstrcpy(user,user2);
 760                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 761                                          "list username (%s) and given "
 762                                          "password ok\n", user));
 763                         }
 764                 }
 765
 766                 SAFE_FREE(user_list);
 767         }
 768
 769         /* check the user= fields and the given password */
 770         if (!ok && lp_username(snum)) {
 771                 char *auser;
 772                 pstring user_list;
 773                 pstrcpy(user_list,lp_username(snum));
 774
 775                 pstring_sub(user_list,"%S",lp_servicename(snum));
 776
 777                 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
 778                      auser = strtok(NULL,LIST_SEP)) {
 779                         if (*auser == '@') {
 780                                 auser = validate_group(auser+1,password,snum);
 781                                 if (auser) {
 782                                         ok = True;
 783                                         fstrcpy(user,auser);
 784                                         DEBUG(3,("authorise_login: ACCEPTED: "
 785                                                  "group username and given "
 786                                                  "password ok (%s)\n", user));
 787                                 }
 788                         } else {
 789                                 fstring user2;
 790                                 fstrcpy(user2,auser);
 791                                 if (user_ok(user2,snum) &&
 792                                     password_ok(user2,password)) {
 793                                         ok = True;
 794                                         fstrcpy(user,user2);
 795                                         DEBUG(3,("authorise_login: ACCEPTED: "
 796                                                  "user list username and "
 797                                                  "given password ok (%s)\n",
 798                                                  user));
 799                                 }
 800                         }
 801                 }
 802         }
 803
 804         /* check for a normal guest connection */
 805         if (!ok && GUEST_OK(snum)) {
 806                 fstring guestname;
 807                 fstrcpy(guestname,lp_guestaccount());
 808                 if (Get_Pwnam(guestname)) {
 809                         fstrcpy(user,guestname);
 810                         ok = True;
 811                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 812                                  "and guest ok (%s)\n", user));
 813                 } else {
 814                         DEBUG(0,("authorise_login: Invalid guest account "
 815                                  "%s??\n",guestname));
 816                 }
 817                 *guest = True;
 818         }
 819
 820         if (ok && !user_ok(user, snum)) {
 821                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 822                 ok = False;
 823         }
 824
 825         return(ok);
 826 }