source3/smbd/password.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 /* users from session setup */
  23 static char *session_userlist = NULL;
  24 static int len_session_userlist = 0;
  25 /* workgroup from session setup. */
  26 static char *session_workgroup = NULL;
  27
  28 /* this holds info on user ids that are already validated for this VC */
  29 static user_struct *validated_users;
  30 static int next_vuid = VUID_OFFSET;
  31 static int num_validated_vuids;
  32
  33 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  34                                 SERVER_ALLOCATED_REQUIRED_NO,
  35                                 SERVER_ALLOCATED_REQUIRED_ANY};
  36
  37 static user_struct *get_valid_user_struct_internal(uint16 vuid,
  38                         enum server_allocated_state server_allocated)
  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) {
  48                         switch (server_allocated) {
  49                                 case SERVER_ALLOCATED_REQUIRED_YES:
  50                                         if (usp->server_info == NULL) {
  51                                                 continue;
  52                                         }
  53                                         break;
  54                                 case SERVER_ALLOCATED_REQUIRED_NO:
  55                                         if (usp->server_info != NULL) {
  56                                                 continue;
  57                                         }
  58                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  59                                         break;
  60                         }
  61                         if (count > 10) {
  62                                 DLIST_PROMOTE(validated_users, usp);
  63                         }
  64                         return usp;
  65                 }
  66         }
  67
  68         return NULL;
  69 }
  70
  71 /****************************************************************************
  72  Check if a uid has been validated, and return an pointer to the user_struct
  73  if it has. NULL if not. vuid is biased by an offset. This allows us to
  74  tell random client vuid's (normally zero) from valid vuids.
  75 ****************************************************************************/
  76
  77 user_struct *get_valid_user_struct(uint16 vuid)
  78 {
  79         return get_valid_user_struct_internal(vuid, SERVER_ALLOCATED_REQUIRED_YES);
  80 }
  81
  82 BOOL is_partial_auth_vuid(uint16 vuid)
  83 {
  84         if (vuid == UID_FIELD_INVALID) {
  85                 return False;
  86         }
  87         return get_valid_user_struct_internal(vuid,
  88                         SERVER_ALLOCATED_REQUIRED_NO) ? True : False;
  89 }
  90
  91 /****************************************************************************
  92  Get the user struct of a partial NTLMSSP login
  93 ****************************************************************************/
  94
  95 user_struct *get_partial_auth_user_struct(uint16 vuid)
  96 {
  97         return get_valid_user_struct_internal(vuid,
  98                         SERVER_ALLOCATED_REQUIRED_NO);
  99 }
 100
 101 /****************************************************************************
 102  Invalidate a uid.
 103 ****************************************************************************/
 104
 105 void invalidate_vuid(uint16 vuid)
 106 {
 107         user_struct *vuser = NULL;
 108
 109         if (vuid == UID_FIELD_INVALID) {
 110                 return;
 111         }
 112
 113         vuser = get_valid_user_struct_internal(vuid,
 114                         SERVER_ALLOCATED_REQUIRED_ANY);
 115         if (vuser == NULL) {
 116                 return;
 117         }
 118
 119         session_yield(vuser);
 120
 121         data_blob_free(&vuser->session_key);
 122
 123         DLIST_REMOVE(validated_users, vuser);
 124
 125         /* clear the vuid from the 'cache' on each connection, and
 126            from the vuid 'owner' of connections */
 127         conn_clear_vuid_cache(vuid);
 128
 129         TALLOC_FREE(vuser);
 130         num_validated_vuids--;
 131 }
 132
 133 /****************************************************************************
 134  Invalidate all vuid entries for this process.
 135 ****************************************************************************/
 136
 137 void invalidate_all_vuids(void)
 138 {
 139         user_struct *usp, *next=NULL;
 140
 141         for (usp=validated_users;usp;usp=next) {
 142                 next = usp->next;
 143                 invalidate_vuid(usp->vuid);
 144         }
 145 }
 146
 147 /****************************************************
 148  Create a new partial auth user struct.
 149 *****************************************************/
 150
 151 int register_initial_vuid(void)
 152 {
 153         user_struct *vuser;
 154
 155         /* Paranoia check. */
 156         if(lp_security() == SEC_SHARE) {
 157                 smb_panic("register_initial_vuid: "
 158                         "Tried to register uid in security=share");
 159         }
 160
 161         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 162         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 163                 return UID_FIELD_INVALID;
 164         }
 165
 166         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 167                 DEBUG(0,("register_initial_vuid: "
 168                                 "Failed to talloc users struct!\n"));
 169                 return UID_FIELD_INVALID;
 170         }
 171
 172         /* Allocate a free vuid. Yes this is a linear search... */
 173         while( get_valid_user_struct_internal(next_vuid,
 174                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 175                 next_vuid++;
 176                 /* Check for vuid wrap. */
 177                 if (next_vuid == UID_FIELD_INVALID) {
 178                         next_vuid = VUID_OFFSET;
 179                 }
 180         }
 181
 182         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 183                 (unsigned int)next_vuid ));
 184
 185         vuser->vuid = next_vuid;
 186
 187         /*
 188          * This happens in an unfinished NTLMSSP session setup. We
 189          * need to allocate a vuid between the first and second calls
 190          * to NTLMSSP.
 191          */
 192         next_vuid++;
 193         num_validated_vuids++;
 194
 195         DLIST_ADD(validated_users, vuser);
 196         return vuser->vuid;
 197 }
 198
 199 /**
 200  *  register that a valid login has been performed, establish 'session'.
 201  *  @param server_info The token returned from the authentication process.
 202  *   (now 'owned' by register_existing_vuid)
 203  *
 204  *  @param session_key The User session key for the login session (now also
 205  *  'owned' by register_existing_vuid)
 206  *
 207  *  @param respose_blob The NT challenge-response, if available.  (May be
 208  *  freed after this call)
 209  *
 210  *  @param smb_name The untranslated name of the user
 211  *
 212  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 213  *   tell random client vuid's (normally zero) from valid vuids.)
 214  *
 215  */
 216
 217 int register_existing_vuid(uint16 vuid,
 218                         auth_serversupplied_info *server_info,
 219                         DATA_BLOB session_key,
 220                         DATA_BLOB response_blob,
 221                         const char *smb_name)
 222 {
 223         user_struct *vuser = get_partial_auth_user_struct(vuid);
 224         if (!vuser) {
 225                 goto fail;
 226         }
 227
 228         /* Use this to keep tabs on all our info from the authentication */
 229         vuser->server_info = server_info;
 230
 231         /* Ensure that the server_info will disappear with
 232          * the vuser it is now attached to */
 233
 234         talloc_steal(vuser, vuser->server_info);
 235
 236         /* the next functions should be done by a SID mapping system (SMS) as
 237          * the new real sam db won't have reference to unix uids or gids
 238          */
 239
 240         vuser->uid = server_info->uid;
 241         vuser->gid = server_info->gid;
 242
 243         vuser->n_groups = server_info->n_groups;
 244         if (vuser->n_groups) {
 245                 if (!(vuser->groups = (gid_t *)talloc_memdup(vuser,
 246                                         server_info->groups,
 247                                         sizeof(gid_t)*vuser->n_groups))) {
 248                         DEBUG(0,("register_existing_vuid: "
 249                                 "failed to talloc_memdup vuser->groups\n"));
 250                         goto fail;
 251                 }
 252         }
 253
 254         vuser->guest = server_info->guest;
 255         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 256
 257         /* This is a potentially untrusted username */
 258         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 259                 sizeof(vuser->user.smb_name));
 260
 261         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 262         fstrcpy(vuser->user.full_name,
 263         pdb_get_fullname(server_info->sam_account));
 264
 265         {
 266                 /* Keep the homedir handy */
 267                 const char *homedir =
 268                         pdb_get_homedir(server_info->sam_account);
 269                 const char *logon_script =
 270                         pdb_get_logon_script(server_info->sam_account);
 271
 272                 if (!IS_SAM_DEFAULT(server_info->sam_account,
 273                                         PDB_UNIXHOMEDIR)) {
 274                         const char *unix_homedir =
 275                                 pdb_get_unix_homedir(server_info->sam_account);
 276                         if (unix_homedir) {
 277                                 vuser->unix_homedir = unix_homedir;
 278                         }
 279                 } else {
 280                         struct passwd *passwd =
 281                                 getpwnam_alloc(vuser, vuser->user.unix_name);
 282                         if (passwd) {
 283                                 vuser->unix_homedir = passwd->pw_dir;
 284                                 /* Ensure that the unix_homedir now
 285                                  * belongs to vuser, so it goes away
 286                                  * with it, not with passwd below: */
 287                                 talloc_steal(vuser, vuser->unix_homedir);
 288                                 TALLOC_FREE(passwd);
 289                         }
 290                 }
 291
 292                 if (homedir) {
 293                         vuser->homedir = homedir;
 294                 }
 295                 if (logon_script) {
 296                         vuser->logon_script = logon_script;
 297                 }
 298         }
 299         vuser->session_key = session_key;
 300
 301         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 302                         (unsigned int)vuser->uid,
 303                         (unsigned int)vuser->gid,
 304                         vuser->user.unix_name, vuser->user.smb_name,
 305                         vuser->user.domain, vuser->guest ));
 306
 307         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 308                 "Real name: %s\n", vuser->user.unix_name,
 309                 vuser->user.full_name));
 310
 311         if (server_info->ptok) {
 312                 vuser->nt_user_token = dup_nt_token(vuser, server_info->ptok);
 313         } else {
 314                 DEBUG(1, ("register_existing_vuid: server_info does not "
 315                         "contain a user_token - cannot continue\n"));
 316                 goto fail;
 317         }
 318
 319         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 320                 "and will be vuid %u\n",
 321                 (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
 322
 323         next_vuid++;
 324         num_validated_vuids++;
 325
 326         if (!session_claim(vuser)) {
 327                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 328                         "for vuid=%d\n",
 329                         vuser->vuid));
 330                 goto fail;
 331         }
 332
 333         /* Register a home dir service for this user if
 334         (a) This is not a guest connection,
 335         (b) we have a home directory defined
 336         (c) there s not an existing static share by that name
 337         If a share exists by this name (autoloaded or not) reuse it . */
 338
 339         vuser->homes_snum = -1;
 340         if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir)) {
 341                 int servicenumber = lp_servicenumber(vuser->user.unix_name);
 342                 if ( servicenumber == -1 ) {
 343                         DEBUG(3, ("Adding homes service for user '%s' using "
 344                                 "home directory: '%s'\n",
 345                                 vuser->user.unix_name, vuser->unix_homedir));
 346                         vuser->homes_snum =
 347                                 add_home_service(vuser->user.unix_name,
 348                                                 vuser->user.unix_name,
 349                                                 vuser->unix_homedir);
 350                 } else {
 351                         DEBUG(3, ("Using static (or previously created) "
 352                                 "service for user '%s'; path = '%s'\n",
 353                                 vuser->user.unix_name,
 354                                 lp_pathname(servicenumber) ));
 355                         vuser->homes_snum = servicenumber;
 356                 }
 357         }
 358
 359         if (srv_is_signing_negotiated() && !vuser->guest &&
 360                         !srv_signing_started()) {
 361                 /* Try and turn on server signing on the first non-guest
 362                  * sessionsetup. */
 363                 srv_set_signing(vuser->session_key, response_blob);
 364         }
 365
 366         /* fill in the current_user_info struct */
 367         set_current_user_info( &vuser->user );
 368         return vuser->vuid;
 369
 370   fail:
 371
 372         if (vuser) {
 373                 invalidate_vuid(vuid);
 374         }
 375         return UID_FIELD_INVALID;
 376 }
 377
 378 /****************************************************************************
 379  Add a name to the session users list.
 380 ****************************************************************************/
 381
 382 void add_session_user(const char *user)
 383 {
 384         fstring suser;
 385         struct passwd *passwd;
 386
 387         if (!(passwd = Get_Pwnam(user)))
 388                 return;
 389
 390         fstrcpy(suser,passwd->pw_name);
 391
 392         if(!*suser)
 393                 return;
 394
 395         if( session_userlist && in_list(suser,session_userlist,False) )
 396                 return;
 397
 398         if( !session_userlist ||
 399             (strlen(suser) + strlen(session_userlist) + 2 >=
 400              len_session_userlist) ) {
 401                 char *newlist;
 402
 403                 if (len_session_userlist > 128 * PSTRING_LEN) {
 404                         DEBUG(3,("add_session_user: session userlist already "
 405                                  "too large.\n"));
 406                         return;
 407                 }
 408                 newlist = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
 409                         session_userlist,
 410                         len_session_userlist + PSTRING_LEN );
 411                 if( newlist == NULL ) {
 412                         DEBUG(1,("Unable to resize session_userlist\n"));
 413                         return;
 414                 }
 415                 if (!session_userlist) {
 416                         *newlist = '\0';
 417                 }
 418                 session_userlist = newlist;
 419                 len_session_userlist += PSTRING_LEN;
 420         }
 421
 422         safe_strcat(session_userlist," ",len_session_userlist-1);
 423         safe_strcat(session_userlist,suser,len_session_userlist-1);
 424 }
 425
 426 /****************************************************************************
 427  In security=share mode we need to store the client workgroup, as that's
 428   what Vista uses for the NTLMv2 calculation.
 429 ****************************************************************************/
 430
 431 void add_session_workgroup(const char *workgroup)
 432 {
 433         if (session_workgroup) {
 434                 SAFE_FREE(session_workgroup);
 435         }
 436         session_workgroup = smb_xstrdup(workgroup);
 437 }
 438
 439 /****************************************************************************
 440  In security=share mode we need to return the client workgroup, as that's
 441   what Vista uses for the NTLMv2 calculation.
 442 ****************************************************************************/
 443
 444 const char *get_session_workgroup(void)
 445 {
 446         return session_workgroup;
 447 }
 448
 449 /****************************************************************************
 450  Check if a user is in a netgroup user list. If at first we don't succeed,
 451  try lower case.
 452 ****************************************************************************/
 453
 454 BOOL user_in_netgroup(const char *user, const char *ngname)
 455 {
 456 #ifdef HAVE_NETGROUP
 457         static char *mydomain = NULL;
 458         fstring lowercase_user;
 459
 460         if (mydomain == NULL)
 461                 yp_get_default_domain(&mydomain);
 462
 463         if(mydomain == NULL) {
 464                 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
 465         }
 466
 467         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 468                 user, mydomain?mydomain:"(ANY)", ngname));
 469
 470         if (innetgr(ngname, NULL, user, mydomain)) {
 471                 DEBUG(5,("user_in_netgroup: Found\n"));
 472                 return (True);
 473         } else {
 474
 475                 /*
 476                  * Ok, innetgr is case sensitive. Try once more with lowercase
 477                  * just in case. Attempt to fix #703. JRA.
 478                  */
 479
 480                 fstrcpy(lowercase_user, user);
 481                 strlower_m(lowercase_user);
 482
 483                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 484                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 485
 486                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 487                         DEBUG(5,("user_in_netgroup: Found\n"));
 488                         return (True);
 489                 }
 490         }
 491 #endif /* HAVE_NETGROUP */
 492         return False;
 493 }
 494
 495 /****************************************************************************
 496  Check if a user is in a user list - can check combinations of UNIX
 497  and netgroup lists.
 498 ****************************************************************************/
 499
 500 BOOL user_in_list(const char *user,const char **list)
 501 {
 502         if (!list || !*list)
 503                 return False;
 504
 505         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 506
 507         while (*list) {
 508
 509                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 510                           user, *list));
 511
 512                 /*
 513                  * Check raw username.
 514                  */
 515                 if (strequal(user, *list))
 516                         return(True);
 517
 518                 /*
 519                  * Now check to see if any combination
 520                  * of UNIX and netgroups has been specified.
 521                  */
 522
 523                 if(**list == '@') {
 524                         /*
 525                          * Old behaviour. Check netgroup list
 526                          * followed by UNIX list.
 527                          */
 528                         if(user_in_netgroup(user, *list +1))
 529                                 return True;
 530                         if(user_in_group(user, *list +1))
 531                                 return True;
 532                 } else if (**list == '+') {
 533
 534                         if((*(*list +1)) == '&') {
 535                                 /*
 536                                  * Search UNIX list followed by netgroup.
 537                                  */
 538                                 if(user_in_group(user, *list +2))
 539                                         return True;
 540                                 if(user_in_netgroup(user, *list +2))
 541                                         return True;
 542
 543                         } else {
 544
 545                                 /*
 546                                  * Just search UNIX list.
 547                                  */
 548
 549                                 if(user_in_group(user, *list +1))
 550                                         return True;
 551                         }
 552
 553                 } else if (**list == '&') {
 554
 555                         if(*(*list +1) == '+') {
 556                                 /*
 557                                  * Search netgroup list followed by UNIX list.
 558                                  */
 559                                 if(user_in_netgroup(user, *list +2))
 560                                         return True;
 561                                 if(user_in_group(user, *list +2))
 562                                         return True;
 563                         } else {
 564                                 /*
 565                                  * Just search netgroup list.
 566                                  */
 567                                 if(user_in_netgroup(user, *list +1))
 568                                         return True;
 569                         }
 570                 }
 571
 572                 list++;
 573         }
 574         return(False);
 575 }
 576
 577 /****************************************************************************
 578  Check if a username is valid.
 579 ****************************************************************************/
 580
 581 static BOOL user_ok(const char *user, int snum)
 582 {
 583         char **valid, **invalid;
 584         BOOL ret;
 585
 586         valid = invalid = NULL;
 587         ret = True;
 588
 589         if (lp_invalid_users(snum)) {
 590                 str_list_copy(&invalid, lp_invalid_users(snum));
 591                 if (invalid &&
 592                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 593
 594                         /* This is used in sec=share only, so no current user
 595                          * around to pass to str_list_sub_basic() */
 596
 597                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 598                                 ret = !user_in_list(user,
 599                                                     (const char **)invalid);
 600                         }
 601                 }
 602         }
 603         if (invalid)
 604                 str_list_free (&invalid);
 605
 606         if (ret && lp_valid_users(snum)) {
 607                 str_list_copy(&valid, lp_valid_users(snum));
 608                 if ( valid &&
 609                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 610
 611                         /* This is used in sec=share only, so no current user
 612                          * around to pass to str_list_sub_basic() */
 613
 614                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 615                                 ret = user_in_list(user, (const char **)valid);
 616                         }
 617                 }
 618         }
 619         if (valid)
 620                 str_list_free (&valid);
 621
 622         if (ret && lp_onlyuser(snum)) {
 623                 char **user_list = str_list_make (lp_username(snum), NULL);
 624                 if (user_list &&
 625                     str_list_substitute(user_list, "%S",
 626                                         lp_servicename(snum))) {
 627                         ret = user_in_list(user, (const char **)user_list);
 628                 }
 629                 if (user_list) str_list_free (&user_list);
 630         }
 631
 632         return(ret);
 633 }
 634
 635 /****************************************************************************
 636  Validate a group username entry. Return the username or NULL.
 637 ****************************************************************************/
 638
 639 static char *validate_group(char *group, DATA_BLOB password,int snum)
 640 {
 641 #ifdef HAVE_NETGROUP
 642         {
 643                 char *host, *user, *domain;
 644                 setnetgrent(group);
 645                 while (getnetgrent(&host, &user, &domain)) {
 646                         if (user) {
 647                                 if (user_ok(user, snum) &&
 648                                     password_ok(user,password)) {
 649                                         endnetgrent();
 650                                         return(user);
 651                                 }
 652                         }
 653                 }
 654                 endnetgrent();
 655         }
 656 #endif
 657
 658 #ifdef HAVE_GETGRENT
 659         {
 660                 struct group *gptr;
 661                 setgrent();
 662                 while ((gptr = (struct group *)getgrent())) {
 663                         if (strequal(gptr->gr_name,group))
 664                                 break;
 665                 }
 666
 667                 /*
 668                  * As user_ok can recurse doing a getgrent(), we must
 669                  * copy the member list into a pstring on the stack before
 670                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 671                  */
 672
 673                 if (gptr) {
 674                         pstring member_list;
 675                         char *member;
 676                         size_t copied_len = 0;
 677                         int i;
 678
 679                         *member_list = '\0';
 680                         member = member_list;
 681
 682                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 683                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 684                                 if(copied_len+member_len < sizeof(pstring)) {
 685
 686                                         DEBUG(10,("validate_group: = gr_mem = "
 687                                                   "%s\n", gptr->gr_mem[i]));
 688
 689                                         safe_strcpy(member, gptr->gr_mem[i],
 690                                                     sizeof(pstring) -
 691                                                     copied_len - 1);
 692                                         copied_len += member_len;
 693                                         member += copied_len;
 694                                 } else {
 695                                         *member = '\0';
 696                                 }
 697                         }
 698
 699                         endgrent();
 700
 701                         member = member_list;
 702                         while (*member) {
 703                                 static fstring name;
 704                                 fstrcpy(name,member);
 705                                 if (user_ok(name,snum) &&
 706                                     password_ok(name,password)) {
 707                                         endgrent();
 708                                         return(&name[0]);
 709                                 }
 710
 711                                 DEBUG(10,("validate_group = member = %s\n",
 712                                           member));
 713
 714                                 member += strlen(member) + 1;
 715                         }
 716                 } else {
 717                         endgrent();
 718                         return NULL;
 719                 }
 720         }
 721 #endif
 722         return(NULL);
 723 }
 724
 725 /****************************************************************************
 726  Check for authority to login to a service with a given username/password.
 727  Note this is *NOT* used when logging on using sessionsetup_and_X.
 728 ****************************************************************************/
 729
 730 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
 731                      BOOL *guest)
 732 {
 733         BOOL ok = False;
 734
 735 #ifdef DEBUG_PASSWORD
 736         DEBUG(100,("authorise_login: checking authorisation on "
 737                    "user=%s pass=%s\n", user,password.data));
 738 #endif
 739
 740         *guest = False;
 741
 742         /* there are several possibilities:
 743                 1) login as the given user with given password
 744                 2) login as a previously registered username with the given
 745                    password
 746                 3) login as a session list username with the given password
 747                 4) login as a previously validated user/password pair
 748                 5) login as the "user =" user with given password
 749                 6) login as the "user =" user with no password
 750                    (guest connection)
 751                 7) login as guest user with no password
 752
 753                 if the service is guest_only then steps 1 to 5 are skipped
 754         */
 755
 756         /* now check the list of session users */
 757         if (!ok) {
 758                 char *auser;
 759                 char *user_list = NULL;
 760
 761                 if ( session_userlist )
 762                         user_list = SMB_STRDUP(session_userlist);
 763                 else
 764                         user_list = SMB_STRDUP("");
 765
 766                 if (!user_list)
 767                         return(False);
 768
 769                 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
 770                      auser = strtok(NULL,LIST_SEP)) {
 771                         fstring user2;
 772                         fstrcpy(user2,auser);
 773                         if (!user_ok(user2,snum))
 774                                 continue;
 775
 776                         if (password_ok(user2,password)) {
 777                                 ok = True;
 778                                 fstrcpy(user,user2);
 779                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 780                                          "list username (%s) and given "
 781                                          "password ok\n", user));
 782                         }
 783                 }
 784
 785                 SAFE_FREE(user_list);
 786         }
 787
 788         /* check the user= fields and the given password */
 789         if (!ok && lp_username(snum)) {
 790                 char *auser;
 791                 pstring user_list;
 792                 pstrcpy(user_list,lp_username(snum));
 793
 794                 pstring_sub(user_list,"%S",lp_servicename(snum));
 795
 796                 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
 797                      auser = strtok(NULL,LIST_SEP)) {
 798                         if (*auser == '@') {
 799                                 auser = validate_group(auser+1,password,snum);
 800                                 if (auser) {
 801                                         ok = True;
 802                                         fstrcpy(user,auser);
 803                                         DEBUG(3,("authorise_login: ACCEPTED: "
 804                                                  "group username and given "
 805                                                  "password ok (%s)\n", user));
 806                                 }
 807                         } else {
 808                                 fstring user2;
 809                                 fstrcpy(user2,auser);
 810                                 if (user_ok(user2,snum) &&
 811                                     password_ok(user2,password)) {
 812                                         ok = True;
 813                                         fstrcpy(user,user2);
 814                                         DEBUG(3,("authorise_login: ACCEPTED: "
 815                                                  "user list username and "
 816                                                  "given password ok (%s)\n",
 817                                                  user));
 818                                 }
 819                         }
 820                 }
 821         }
 822
 823         /* check for a normal guest connection */
 824         if (!ok && GUEST_OK(snum)) {
 825                 fstring guestname;
 826                 fstrcpy(guestname,lp_guestaccount());
 827                 if (Get_Pwnam(guestname)) {
 828                         fstrcpy(user,guestname);
 829                         ok = True;
 830                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 831                                  "and guest ok (%s)\n", user));
 832                 } else {
 833                         DEBUG(0,("authorise_login: Invalid guest account "
 834                                  "%s??\n",guestname));
 835                 }
 836                 *guest = True;
 837         }
 838
 839         if (ok && !user_ok(user, snum)) {
 840                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 841                 ok = False;
 842         }
 843
 844         return(ok);
 845 }