source3/smbd/password.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  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 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  35                                 SERVER_ALLOCATED_REQUIRED_NO,
  36                                 SERVER_ALLOCATED_REQUIRED_ANY};
  37
  38 static user_struct *get_valid_user_struct_internal(uint16 vuid,
  39                         enum server_allocated_state server_allocated)
  40 {
  41         user_struct *usp;
  42         int count=0;
  43
  44         if (vuid == UID_FIELD_INVALID)
  45                 return NULL;
  46
  47         for (usp=validated_users;usp;usp=usp->next,count++) {
  48                 if (vuid == usp->vuid) {
  49                         switch (server_allocated) {
  50                                 case SERVER_ALLOCATED_REQUIRED_YES:
  51                                         if (usp->server_info == NULL) {
  52                                                 continue;
  53                                         }
  54                                         break;
  55                                 case SERVER_ALLOCATED_REQUIRED_NO:
  56                                         if (usp->server_info != NULL) {
  57                                                 continue;
  58                                         }
  59                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  60                                         break;
  61                         }
  62                         if (count > 10) {
  63                                 DLIST_PROMOTE(validated_users, usp);
  64                         }
  65                         return usp;
  66                 }
  67         }
  68
  69         return NULL;
  70 }
  71
  72 /****************************************************************************
  73  Check if a uid has been validated, and return an pointer to the user_struct
  74  if it has. NULL if not. vuid is biased by an offset. This allows us to
  75  tell random client vuid's (normally zero) from valid vuids.
  76 ****************************************************************************/
  77
  78 user_struct *get_valid_user_struct(uint16 vuid)
  79 {
  80         return get_valid_user_struct_internal(vuid,
  81                         SERVER_ALLOCATED_REQUIRED_YES);
  82 }
  83
  84 bool is_partial_auth_vuid(uint16 vuid)
  85 {
  86         if (vuid == UID_FIELD_INVALID) {
  87                 return False;
  88         }
  89         return get_valid_user_struct_internal(vuid,
  90                         SERVER_ALLOCATED_REQUIRED_NO) ? True : False;
  91 }
  92
  93 /****************************************************************************
  94  Get the user struct of a partial NTLMSSP login
  95 ****************************************************************************/
  96
  97 user_struct *get_partial_auth_user_struct(uint16 vuid)
  98 {
  99         return get_valid_user_struct_internal(vuid,
 100                         SERVER_ALLOCATED_REQUIRED_NO);
 101 }
 102
 103 /****************************************************************************
 104  Invalidate a uid.
 105 ****************************************************************************/
 106
 107 void invalidate_vuid(uint16 vuid)
 108 {
 109         user_struct *vuser = NULL;
 110
 111         if (vuid == UID_FIELD_INVALID) {
 112                 return;
 113         }
 114
 115         vuser = get_valid_user_struct_internal(vuid,
 116                         SERVER_ALLOCATED_REQUIRED_ANY);
 117         if (vuser == NULL) {
 118                 return;
 119         }
 120
 121         session_yield(vuser);
 122
 123         data_blob_free(&vuser->session_key);
 124
 125         DLIST_REMOVE(validated_users, vuser);
 126
 127         /* clear the vuid from the 'cache' on each connection, and
 128            from the vuid 'owner' of connections */
 129         conn_clear_vuid_cache(vuid);
 130
 131         TALLOC_FREE(vuser);
 132         num_validated_vuids--;
 133 }
 134
 135 /****************************************************************************
 136  Invalidate all vuid entries for this process.
 137 ****************************************************************************/
 138
 139 void invalidate_all_vuids(void)
 140 {
 141         user_struct *usp, *next=NULL;
 142
 143         for (usp=validated_users;usp;usp=next) {
 144                 next = usp->next;
 145                 invalidate_vuid(usp->vuid);
 146         }
 147 }
 148
 149 /****************************************************
 150  Create a new partial auth user struct.
 151 *****************************************************/
 152
 153 int register_initial_vuid(void)
 154 {
 155         user_struct *vuser;
 156
 157         /* Paranoia check. */
 158         if(lp_security() == SEC_SHARE) {
 159                 smb_panic("register_initial_vuid: "
 160                         "Tried to register uid in security=share");
 161         }
 162
 163         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 164         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 165                 return UID_FIELD_INVALID;
 166         }
 167
 168         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 169                 DEBUG(0,("register_initial_vuid: "
 170                                 "Failed to talloc users struct!\n"));
 171                 return UID_FIELD_INVALID;
 172         }
 173
 174         /* Allocate a free vuid. Yes this is a linear search... */
 175         while( get_valid_user_struct_internal(next_vuid,
 176                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 177                 next_vuid++;
 178                 /* Check for vuid wrap. */
 179                 if (next_vuid == UID_FIELD_INVALID) {
 180                         next_vuid = VUID_OFFSET;
 181                 }
 182         }
 183
 184         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 185                 (unsigned int)next_vuid ));
 186
 187         vuser->vuid = next_vuid;
 188
 189         /*
 190          * This happens in an unfinished NTLMSSP session setup. We
 191          * need to allocate a vuid between the first and second calls
 192          * to NTLMSSP.
 193          */
 194         next_vuid++;
 195         num_validated_vuids++;
 196
 197         DLIST_ADD(validated_users, vuser);
 198         return vuser->vuid;
 199 }
 200
 201 /**
 202  *  register that a valid login has been performed, establish 'session'.
 203  *  @param server_info The token returned from the authentication process.
 204  *   (now 'owned' by register_existing_vuid)
 205  *
 206  *  @param session_key The User session key for the login session (now also
 207  *  'owned' by register_existing_vuid)
 208  *
 209  *  @param respose_blob The NT challenge-response, if available.  (May be
 210  *  freed after this call)
 211  *
 212  *  @param smb_name The untranslated name of the user
 213  *
 214  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 215  *   tell random client vuid's (normally zero) from valid vuids.)
 216  *
 217  */
 218
 219 int register_existing_vuid(uint16 vuid,
 220                         auth_serversupplied_info *server_info,
 221                         DATA_BLOB session_key,
 222                         DATA_BLOB response_blob,
 223                         const char *smb_name)
 224 {
 225         user_struct *vuser = get_partial_auth_user_struct(vuid);
 226         if (!vuser) {
 227                 goto fail;
 228         }
 229
 230         /* Use this to keep tabs on all our info from the authentication */
 231         vuser->server_info = server_info;
 232
 233         /* Ensure that the server_info will disappear with
 234          * the vuser it is now attached to */
 235
 236         talloc_steal(vuser, vuser->server_info);
 237
 238         /* the next functions should be done by a SID mapping system (SMS) as
 239          * the new real sam db won't have reference to unix uids or gids
 240          */
 241
 242         vuser->uid = server_info->uid;
 243         vuser->gid = server_info->gid;
 244
 245         vuser->n_groups = server_info->n_groups;
 246         if (vuser->n_groups) {
 247                 if (!(vuser->groups = (gid_t *)talloc_memdup(vuser,
 248                                         server_info->groups,
 249                                         sizeof(gid_t)*vuser->n_groups))) {
 250                         DEBUG(0,("register_existing_vuid: "
 251                                 "failed to talloc_memdup vuser->groups\n"));
 252                         goto fail;
 253                 }
 254         }
 255
 256         vuser->guest = server_info->guest;
 257         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 258
 259         /* This is a potentially untrusted username */
 260         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 261                 sizeof(vuser->user.smb_name));
 262
 263         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 264         fstrcpy(vuser->user.full_name,
 265         pdb_get_fullname(server_info->sam_account));
 266
 267         {
 268                 /* Keep the homedir handy */
 269                 const char *homedir =
 270                         pdb_get_homedir(server_info->sam_account);
 271                 const char *logon_script =
 272                         pdb_get_logon_script(server_info->sam_account);
 273
 274                 if (!IS_SAM_DEFAULT(server_info->sam_account,
 275                                         PDB_UNIXHOMEDIR)) {
 276                         const char *unix_homedir =
 277                                 pdb_get_unix_homedir(server_info->sam_account);
 278                         if (unix_homedir) {
 279                                 vuser->unix_homedir = unix_homedir;
 280                         }
 281                 } else {
 282                         struct passwd *passwd =
 283                                 getpwnam_alloc(vuser, vuser->user.unix_name);
 284                         if (passwd) {
 285                                 vuser->unix_homedir = passwd->pw_dir;
 286                                 /* Ensure that the unix_homedir now
 287                                  * belongs to vuser, so it goes away
 288                                  * with it, not with passwd below: */
 289                                 talloc_steal(vuser, vuser->unix_homedir);
 290                                 TALLOC_FREE(passwd);
 291                         }
 292                 }
 293
 294                 if (homedir) {
 295                         vuser->homedir = homedir;
 296                 }
 297                 if (logon_script) {
 298                         vuser->logon_script = logon_script;
 299                 }
 300         }
 301         vuser->session_key = session_key;
 302
 303         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 304                         (unsigned int)vuser->uid,
 305                         (unsigned int)vuser->gid,
 306                         vuser->user.unix_name, vuser->user.smb_name,
 307                         vuser->user.domain, vuser->guest ));
 308
 309         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 310                 "Real name: %s\n", vuser->user.unix_name,
 311                 vuser->user.full_name));
 312
 313         if (server_info->ptok) {
 314                 vuser->nt_user_token = dup_nt_token(vuser, server_info->ptok);
 315         } else {
 316                 DEBUG(1, ("register_existing_vuid: server_info does not "
 317                         "contain a user_token - cannot continue\n"));
 318                 goto fail;
 319         }
 320
 321         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 322                 "and will be vuid %u\n",
 323                 (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
 324
 325         next_vuid++;
 326         num_validated_vuids++;
 327
 328         if (!session_claim(vuser)) {
 329                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 330                         "for vuid=%d\n",
 331                         vuser->vuid));
 332                 goto fail;
 333         }
 334
 335         /* Register a home dir service for this user if
 336         (a) This is not a guest connection,
 337         (b) we have a home directory defined
 338         (c) there s not an existing static share by that name
 339         If a share exists by this name (autoloaded or not) reuse it . */
 340
 341         vuser->homes_snum = -1;
 342         if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir)) {
 343                 int servicenumber = lp_servicenumber(vuser->user.unix_name);
 344                 if ( servicenumber == -1 ) {
 345                         DEBUG(3, ("Adding homes service for user '%s' using "
 346                                 "home directory: '%s'\n",
 347                                 vuser->user.unix_name, vuser->unix_homedir));
 348                         vuser->homes_snum =
 349                                 add_home_service(vuser->user.unix_name,
 350                                                 vuser->user.unix_name,
 351                                                 vuser->unix_homedir);
 352                 } else {
 353                         DEBUG(3, ("Using static (or previously created) "
 354                                 "service for user '%s'; path = '%s'\n",
 355                                 vuser->user.unix_name,
 356                                 lp_pathname(servicenumber) ));
 357                         vuser->homes_snum = servicenumber;
 358                 }
 359         }
 360
 361         if (srv_is_signing_negotiated() && !vuser->guest &&
 362                         !srv_signing_started()) {
 363                 /* Try and turn on server signing on the first non-guest
 364                  * sessionsetup. */
 365                 srv_set_signing(vuser->session_key, response_blob);
 366         }
 367
 368         /* fill in the current_user_info struct */
 369         set_current_user_info( &vuser->user );
 370         return vuser->vuid;
 371
 372   fail:
 373
 374         if (vuser) {
 375                 invalidate_vuid(vuid);
 376         }
 377         return UID_FIELD_INVALID;
 378 }
 379
 380 /****************************************************************************
 381  Add a name to the session users list.
 382 ****************************************************************************/
 383
 384 void add_session_user(const char *user)
 385 {
 386         fstring suser;
 387         struct passwd *passwd;
 388
 389         if (!(passwd = Get_Pwnam(user)))
 390                 return;
 391
 392         fstrcpy(suser,passwd->pw_name);
 393
 394         if(!*suser)
 395                 return;
 396
 397         if( session_userlist && in_list(suser,session_userlist,False) )
 398                 return;
 399
 400         if( !session_userlist ||
 401             (strlen(suser) + strlen(session_userlist) + 2 >=
 402              len_session_userlist) ) {
 403                 char *newlist;
 404
 405                 if (len_session_userlist > 128 * PSTRING_LEN) {
 406                         DEBUG(3,("add_session_user: session userlist already "
 407                                  "too large.\n"));
 408                         return;
 409                 }
 410                 newlist = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
 411                         session_userlist,
 412                         len_session_userlist + PSTRING_LEN );
 413                 if( newlist == NULL ) {
 414                         DEBUG(1,("Unable to resize session_userlist\n"));
 415                         return;
 416                 }
 417                 if (!session_userlist) {
 418                         *newlist = '\0';
 419                 }
 420                 session_userlist = newlist;
 421                 len_session_userlist += PSTRING_LEN;
 422         }
 423
 424         safe_strcat(session_userlist," ",len_session_userlist-1);
 425         safe_strcat(session_userlist,suser,len_session_userlist-1);
 426 }
 427
 428 /****************************************************************************
 429  In security=share mode we need to store the client workgroup, as that's
 430   what Vista uses for the NTLMv2 calculation.
 431 ****************************************************************************/
 432
 433 void add_session_workgroup(const char *workgroup)
 434 {
 435         if (session_workgroup) {
 436                 SAFE_FREE(session_workgroup);
 437         }
 438         session_workgroup = smb_xstrdup(workgroup);
 439 }
 440
 441 /****************************************************************************
 442  In security=share mode we need to return the client workgroup, as that's
 443   what Vista uses for the NTLMv2 calculation.
 444 ****************************************************************************/
 445
 446 const char *get_session_workgroup(void)
 447 {
 448         return session_workgroup;
 449 }
 450
 451 /****************************************************************************
 452  Check if a user is in a netgroup user list. If at first we don't succeed,
 453  try lower case.
 454 ****************************************************************************/
 455
 456 bool user_in_netgroup(const char *user, const char *ngname)
 457 {
 458 #ifdef HAVE_NETGROUP
 459         static char *mydomain = NULL;
 460         fstring lowercase_user;
 461
 462         if (mydomain == NULL)
 463                 yp_get_default_domain(&mydomain);
 464
 465         if(mydomain == NULL) {
 466                 DEBUG(5,("Unable to get default yp domain, "
 467                         "let's try without specifying it\n"));
 468         }
 469
 470         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 471                 user, mydomain?mydomain:"(ANY)", ngname));
 472
 473         if (innetgr(ngname, NULL, user, mydomain)) {
 474                 DEBUG(5,("user_in_netgroup: Found\n"));
 475                 return (True);
 476         } else {
 477
 478                 /*
 479                  * Ok, innetgr is case sensitive. Try once more with lowercase
 480                  * just in case. Attempt to fix #703. JRA.
 481                  */
 482
 483                 fstrcpy(lowercase_user, user);
 484                 strlower_m(lowercase_user);
 485
 486                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 487                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 488
 489                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 490                         DEBUG(5,("user_in_netgroup: Found\n"));
 491                         return (True);
 492                 }
 493         }
 494 #endif /* HAVE_NETGROUP */
 495         return False;
 496 }
 497
 498 /****************************************************************************
 499  Check if a user is in a user list - can check combinations of UNIX
 500  and netgroup lists.
 501 ****************************************************************************/
 502
 503 bool user_in_list(const char *user,const char **list)
 504 {
 505         if (!list || !*list)
 506                 return False;
 507
 508         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 509
 510         while (*list) {
 511
 512                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 513                           user, *list));
 514
 515                 /*
 516                  * Check raw username.
 517                  */
 518                 if (strequal(user, *list))
 519                         return(True);
 520
 521                 /*
 522                  * Now check to see if any combination
 523                  * of UNIX and netgroups has been specified.
 524                  */
 525
 526                 if(**list == '@') {
 527                         /*
 528                          * Old behaviour. Check netgroup list
 529                          * followed by UNIX list.
 530                          */
 531                         if(user_in_netgroup(user, *list +1))
 532                                 return True;
 533                         if(user_in_group(user, *list +1))
 534                                 return True;
 535                 } else if (**list == '+') {
 536
 537                         if((*(*list +1)) == '&') {
 538                                 /*
 539                                  * Search UNIX list followed by netgroup.
 540                                  */
 541                                 if(user_in_group(user, *list +2))
 542                                         return True;
 543                                 if(user_in_netgroup(user, *list +2))
 544                                         return True;
 545
 546                         } else {
 547
 548                                 /*
 549                                  * Just search UNIX list.
 550                                  */
 551
 552                                 if(user_in_group(user, *list +1))
 553                                         return True;
 554                         }
 555
 556                 } else if (**list == '&') {
 557
 558                         if(*(*list +1) == '+') {
 559                                 /*
 560                                  * Search netgroup list followed by UNIX list.
 561                                  */
 562                                 if(user_in_netgroup(user, *list +2))
 563                                         return True;
 564                                 if(user_in_group(user, *list +2))
 565                                         return True;
 566                         } else {
 567                                 /*
 568                                  * Just search netgroup list.
 569                                  */
 570                                 if(user_in_netgroup(user, *list +1))
 571                                         return True;
 572                         }
 573                 }
 574
 575                 list++;
 576         }
 577         return(False);
 578 }
 579
 580 /****************************************************************************
 581  Check if a username is valid.
 582 ****************************************************************************/
 583
 584 static bool user_ok(const char *user, int snum)
 585 {
 586         char **valid, **invalid;
 587         bool ret;
 588
 589         valid = invalid = NULL;
 590         ret = True;
 591
 592         if (lp_invalid_users(snum)) {
 593                 str_list_copy(&invalid, lp_invalid_users(snum));
 594                 if (invalid &&
 595                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 596
 597                         /* This is used in sec=share only, so no current user
 598                          * around to pass to str_list_sub_basic() */
 599
 600                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 601                                 ret = !user_in_list(user,
 602                                                     (const char **)invalid);
 603                         }
 604                 }
 605         }
 606         if (invalid)
 607                 str_list_free (&invalid);
 608
 609         if (ret && lp_valid_users(snum)) {
 610                 str_list_copy(&valid, lp_valid_users(snum));
 611                 if ( valid &&
 612                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 613
 614                         /* This is used in sec=share only, so no current user
 615                          * around to pass to str_list_sub_basic() */
 616
 617                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 618                                 ret = user_in_list(user, (const char **)valid);
 619                         }
 620                 }
 621         }
 622         if (valid)
 623                 str_list_free (&valid);
 624
 625         if (ret && lp_onlyuser(snum)) {
 626                 char **user_list = str_list_make (lp_username(snum), NULL);
 627                 if (user_list &&
 628                     str_list_substitute(user_list, "%S",
 629                                         lp_servicename(snum))) {
 630                         ret = user_in_list(user, (const char **)user_list);
 631                 }
 632                 if (user_list) str_list_free (&user_list);
 633         }
 634
 635         return(ret);
 636 }
 637
 638 /****************************************************************************
 639  Validate a group username entry. Return the username or NULL.
 640 ****************************************************************************/
 641
 642 static char *validate_group(char *group, DATA_BLOB password,int snum)
 643 {
 644 #ifdef HAVE_NETGROUP
 645         {
 646                 char *host, *user, *domain;
 647                 setnetgrent(group);
 648                 while (getnetgrent(&host, &user, &domain)) {
 649                         if (user) {
 650                                 if (user_ok(user, snum) &&
 651                                     password_ok(user,password)) {
 652                                         endnetgrent();
 653                                         return(user);
 654                                 }
 655                         }
 656                 }
 657                 endnetgrent();
 658         }
 659 #endif
 660
 661 #ifdef HAVE_GETGRENT
 662         {
 663                 struct group *gptr;
 664                 setgrent();
 665                 while ((gptr = (struct group *)getgrent())) {
 666                         if (strequal(gptr->gr_name,group))
 667                                 break;
 668                 }
 669
 670                 /*
 671                  * As user_ok can recurse doing a getgrent(), we must
 672                  * copy the member list into a pstring on the stack before
 673                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 674                  */
 675
 676                 if (gptr) {
 677                         pstring member_list;
 678                         char *member;
 679                         size_t copied_len = 0;
 680                         int i;
 681
 682                         *member_list = '\0';
 683                         member = member_list;
 684
 685                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 686                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 687                                 if(copied_len+member_len < sizeof(pstring)) {
 688
 689                                         DEBUG(10,("validate_group: = gr_mem = "
 690                                                   "%s\n", gptr->gr_mem[i]));
 691
 692                                         safe_strcpy(member, gptr->gr_mem[i],
 693                                                     sizeof(pstring) -
 694                                                     copied_len - 1);
 695                                         copied_len += member_len;
 696                                         member += copied_len;
 697                                 } else {
 698                                         *member = '\0';
 699                                 }
 700                         }
 701
 702                         endgrent();
 703
 704                         member = member_list;
 705                         while (*member) {
 706                                 static fstring name;
 707                                 fstrcpy(name,member);
 708                                 if (user_ok(name,snum) &&
 709                                     password_ok(name,password)) {
 710                                         endgrent();
 711                                         return(&name[0]);
 712                                 }
 713
 714                                 DEBUG(10,("validate_group = member = %s\n",
 715                                           member));
 716
 717                                 member += strlen(member) + 1;
 718                         }
 719                 } else {
 720                         endgrent();
 721                         return NULL;
 722                 }
 723         }
 724 #endif
 725         return(NULL);
 726 }
 727
 728 /****************************************************************************
 729  Check for authority to login to a service with a given username/password.
 730  Note this is *NOT* used when logging on using sessionsetup_and_X.
 731 ****************************************************************************/
 732
 733 bool authorise_login(int snum, fstring user, DATA_BLOB password,
 734                      bool *guest)
 735 {
 736         bool ok = False;
 737
 738 #ifdef DEBUG_PASSWORD
 739         DEBUG(100,("authorise_login: checking authorisation on "
 740                    "user=%s pass=%s\n", user,password.data));
 741 #endif
 742
 743         *guest = False;
 744
 745         /* there are several possibilities:
 746                 1) login as the given user with given password
 747                 2) login as a previously registered username with the given
 748                    password
 749                 3) login as a session list username with the given password
 750                 4) login as a previously validated user/password pair
 751                 5) login as the "user =" user with given password
 752                 6) login as the "user =" user with no password
 753                    (guest connection)
 754                 7) login as guest user with no password
 755
 756                 if the service is guest_only then steps 1 to 5 are skipped
 757         */
 758
 759         /* now check the list of session users */
 760         if (!ok) {
 761                 char *auser;
 762                 char *user_list = NULL;
 763
 764                 if ( session_userlist )
 765                         user_list = SMB_STRDUP(session_userlist);
 766                 else
 767                         user_list = SMB_STRDUP("");
 768
 769                 if (!user_list)
 770                         return(False);
 771
 772                 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
 773                      auser = strtok(NULL,LIST_SEP)) {
 774                         fstring user2;
 775                         fstrcpy(user2,auser);
 776                         if (!user_ok(user2,snum))
 777                                 continue;
 778
 779                         if (password_ok(user2,password)) {
 780                                 ok = True;
 781                                 fstrcpy(user,user2);
 782                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 783                                          "list username (%s) and given "
 784                                          "password ok\n", user));
 785                         }
 786                 }
 787
 788                 SAFE_FREE(user_list);
 789         }
 790
 791         /* check the user= fields and the given password */
 792         if (!ok && lp_username(snum)) {
 793                 char *auser;
 794                 pstring user_list;
 795                 pstrcpy(user_list,lp_username(snum));
 796
 797                 pstring_sub(user_list,"%S",lp_servicename(snum));
 798
 799                 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
 800                      auser = strtok(NULL,LIST_SEP)) {
 801                         if (*auser == '@') {
 802                                 auser = validate_group(auser+1,password,snum);
 803                                 if (auser) {
 804                                         ok = True;
 805                                         fstrcpy(user,auser);
 806                                         DEBUG(3,("authorise_login: ACCEPTED: "
 807                                                  "group username and given "
 808                                                  "password ok (%s)\n", user));
 809                                 }
 810                         } else {
 811                                 fstring user2;
 812                                 fstrcpy(user2,auser);
 813                                 if (user_ok(user2,snum) &&
 814                                     password_ok(user2,password)) {
 815                                         ok = True;
 816                                         fstrcpy(user,user2);
 817                                         DEBUG(3,("authorise_login: ACCEPTED: "
 818                                                  "user list username and "
 819                                                  "given password ok (%s)\n",
 820                                                  user));
 821                                 }
 822                         }
 823                 }
 824         }
 825
 826         /* check for a normal guest connection */
 827         if (!ok && GUEST_OK(snum)) {
 828                 fstring guestname;
 829                 fstrcpy(guestname,lp_guestaccount());
 830                 if (Get_Pwnam(guestname)) {
 831                         fstrcpy(user,guestname);
 832                         ok = True;
 833                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 834                                  "and guest ok (%s)\n", user));
 835                 } else {
 836                         DEBUG(0,("authorise_login: Invalid guest account "
 837                                  "%s??\n",guestname));
 838                 }
 839                 *guest = True;
 840         }
 841
 842         if (ok && !user_ok(user, snum)) {
 843                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 844                 ok = False;
 845         }
 846
 847         return(ok);
 848 }