source/smbd/password.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 /* users from session setup */
  24 static char *session_userlist = NULL;
  25 static int len_session_userlist = 0;
  26 /* workgroup from session setup. */
  27 static char *session_workgroup = NULL;
  28
  29 /* this holds info on user ids that are already validated for this VC */
  30 static user_struct *validated_users;
  31 static int next_vuid = VUID_OFFSET;
  32 static int num_validated_vuids;
  33
  34 /****************************************************************************
  35  Check if a uid has been validated, and return an pointer to the user_struct
  36  if it has. NULL if not. vuid is biased by an offset. This allows us to
  37  tell random client vuid's (normally zero) from valid vuids.
  38 ****************************************************************************/
  39
  40 user_struct *get_valid_user_struct(uint16 vuid)
  41 {
  42         user_struct *usp;
  43         int count=0;
  44
  45         if (vuid == UID_FIELD_INVALID)
  46                 return NULL;
  47
  48         for (usp=validated_users;usp;usp=usp->next,count++) {
  49                 if (vuid == usp->vuid && usp->server_info) {
  50                         if (count > 10) {
  51                                 DLIST_PROMOTE(validated_users, usp);
  52                         }
  53                         return usp;
  54                 }
  55         }
  56
  57         return NULL;
  58 }
  59
  60 /****************************************************************************
  61  Get the user struct of a partial NTLMSSP login
  62 ****************************************************************************/
  63
  64 user_struct *get_partial_auth_user_struct(uint16 vuid)
  65 {
  66         user_struct *usp;
  67         int count=0;
  68
  69         if (vuid == UID_FIELD_INVALID)
  70                 return NULL;
  71
  72         for (usp=validated_users;usp;usp=usp->next,count++) {
  73                 if (vuid == usp->vuid && !usp->server_info) {
  74                         if (count > 10) {
  75                                 DLIST_PROMOTE(validated_users, usp);
  76                         }
  77                         return usp;
  78                 }
  79         }
  80
  81         return NULL;
  82 }
  83
  84 /****************************************************************************
  85  Invalidate a uid.
  86 ****************************************************************************/
  87
  88 void invalidate_vuid(uint16 vuid)
  89 {
  90         user_struct *vuser = get_valid_user_struct(vuid);
  91
  92         if (vuser == NULL)
  93                 return;
  94
  95         SAFE_FREE(vuser->homedir);
  96         SAFE_FREE(vuser->unix_homedir);
  97         SAFE_FREE(vuser->logon_script);
  98
  99         session_yield(vuser);
 100         SAFE_FREE(vuser->session_keystr);
 101
 102         TALLOC_FREE(vuser->server_info);
 103
 104         data_blob_free(&vuser->session_key);
 105
 106         DLIST_REMOVE(validated_users, vuser);
 107
 108         /* clear the vuid from the 'cache' on each connection, and
 109            from the vuid 'owner' of connections */
 110         conn_clear_vuid_cache(vuid);
 111
 112         SAFE_FREE(vuser->groups);
 113         TALLOC_FREE(vuser->nt_user_token);
 114
 115         SAFE_FREE(vuser);
 116         num_validated_vuids--;
 117 }
 118
 119 void invalidate_intermediate_vuid(uint16 vuid)
 120 {
 121         user_struct *vuser = get_partial_auth_user_struct(vuid);
 122
 123         if (vuser == NULL)
 124                 return;
 125
 126         DLIST_REMOVE(validated_users, vuser);
 127
 128         SAFE_FREE(vuser);
 129         num_validated_vuids--;
 130 }
 131
 132 /****************************************************************************
 133  Invalidate all vuid entries for this process.
 134 ****************************************************************************/
 135
 136 void invalidate_all_vuids(void)
 137 {
 138         user_struct *usp, *next=NULL;
 139
 140         for (usp=validated_users;usp;usp=next) {
 141                 next = usp->next;
 142
 143                 invalidate_vuid(usp->vuid);
 144         }
 145 }
 146
 147 /**
 148  *  register that a valid login has been performed, establish 'session'.
 149  *  @param server_info The token returned from the authentication process.
 150  *   (now 'owned' by register_vuid)
 151  *
 152  *  @param session_key The User session key for the login session (now also
 153  *  'owned' by register_vuid)
 154  *
 155  *  @param respose_blob The NT challenge-response, if available.  (May be
 156  *  freed after this call)
 157  *
 158  *  @param smb_name The untranslated name of the user
 159  *
 160  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 161  *   tell random client vuid's (normally zero) from valid vuids.)
 162  *
 163  */
 164
 165 int register_vuid(auth_serversupplied_info *server_info,
 166                   DATA_BLOB session_key, DATA_BLOB response_blob,
 167                   const char *smb_name)
 168 {
 169         user_struct *vuser = NULL;
 170
 171         /* Paranoia check. */
 172         if(lp_security() == SEC_SHARE) {
 173                 smb_panic("Tried to register uid in security=share\n");
 174         }
 175
 176         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 177         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 178                 data_blob_free(&session_key);
 179                 TALLOC_FREE(server_info);
 180                 return UID_FIELD_INVALID;
 181         }
 182
 183         if((vuser = SMB_MALLOC_P(user_struct)) == NULL) {
 184                 DEBUG(0,("Failed to malloc users struct!\n"));
 185                 data_blob_free(&session_key);
 186                 TALLOC_FREE(server_info);
 187                 return UID_FIELD_INVALID;
 188         }
 189
 190         ZERO_STRUCTP(vuser);
 191
 192         /* Allocate a free vuid. Yes this is a linear search... :-) */
 193         while( (get_valid_user_struct(next_vuid) != NULL)
 194                || (get_partial_auth_user_struct(next_vuid) != NULL) ) {
 195                 next_vuid++;
 196                 /* Check for vuid wrap. */
 197                 if (next_vuid == UID_FIELD_INVALID)
 198                         next_vuid = VUID_OFFSET;
 199         }
 200
 201         DEBUG(10,("register_vuid: allocated vuid = %u\n",
 202                   (unsigned int)next_vuid ));
 203
 204         vuser->vuid = next_vuid;
 205
 206         if (!server_info) {
 207                 /*
 208                  * This happens in an unfinished NTLMSSP session setup. We
 209                  * need to allocate a vuid between the first and second calls
 210                  * to NTLMSSP.
 211                  */
 212                 next_vuid++;
 213                 num_validated_vuids++;
 214
 215                 vuser->server_info = NULL;
 216
 217                 DLIST_ADD(validated_users, vuser);
 218
 219                 return vuser->vuid;
 220         }
 221
 222         /* the next functions should be done by a SID mapping system (SMS) as
 223          * the new real sam db won't have reference to unix uids or gids
 224          */
 225
 226         vuser->uid = server_info->uid;
 227         vuser->gid = server_info->gid;
 228
 229         vuser->n_groups = server_info->n_groups;
 230         if (vuser->n_groups) {
 231                 if (!(vuser->groups = (gid_t *)memdup(server_info->groups,
 232                                                       sizeof(gid_t) *
 233                                                       vuser->n_groups))) {
 234                         DEBUG(0,("register_vuid: failed to memdup "
 235                                  "vuser->groups\n"));
 236                         data_blob_free(&session_key);
 237                         free(vuser);
 238                         TALLOC_FREE(server_info);
 239                         return UID_FIELD_INVALID;
 240                 }
 241         }
 242
 243         vuser->guest = server_info->guest;
 244         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 245
 246         /* This is a potentially untrusted username */
 247         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 248                      sizeof(vuser->user.smb_name));
 249
 250         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 251         fstrcpy(vuser->user.full_name,
 252                 pdb_get_fullname(server_info->sam_account));
 253
 254         {
 255                 /* Keep the homedir handy */
 256                 const char *homedir =
 257                         pdb_get_homedir(server_info->sam_account);
 258                 const char *logon_script =
 259                         pdb_get_logon_script(server_info->sam_account);
 260
 261                 if (!IS_SAM_DEFAULT(server_info->sam_account,
 262                                     PDB_UNIXHOMEDIR)) {
 263                         const char *unix_homedir =
 264                                 pdb_get_unix_homedir(server_info->sam_account);
 265                         if (unix_homedir) {
 266                                 vuser->unix_homedir =
 267                                         smb_xstrdup(unix_homedir);
 268                         }
 269                 } else {
 270                         struct passwd *passwd =
 271                                 getpwnam_alloc(NULL, vuser->user.unix_name);
 272                         if (passwd) {
 273                                 vuser->unix_homedir =
 274                                         smb_xstrdup(passwd->pw_dir);
 275                                 TALLOC_FREE(passwd);
 276                         }
 277                 }
 278
 279                 if (homedir) {
 280                         vuser->homedir = smb_xstrdup(homedir);
 281                 }
 282                 if (logon_script) {
 283                         vuser->logon_script = smb_xstrdup(logon_script);
 284                 }
 285         }
 286
 287         vuser->session_key = session_key;
 288
 289         DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n",
 290                   (unsigned int)vuser->uid,
 291                   (unsigned int)vuser->gid,
 292                   vuser->user.unix_name, vuser->user.smb_name,
 293                   vuser->user.domain, vuser->guest ));
 294
 295         DEBUG(3, ("User name: %s\tReal name: %s\n", vuser->user.unix_name,
 296                   vuser->user.full_name));
 297
 298         if (server_info->ptok) {
 299                 vuser->nt_user_token = dup_nt_token(NULL, server_info->ptok);
 300         } else {
 301                 DEBUG(1, ("server_info does not contain a user_token - "
 302                           "cannot continue\n"));
 303                 TALLOC_FREE(server_info);
 304                 data_blob_free(&session_key);
 305                 SAFE_FREE(vuser->homedir);
 306                 SAFE_FREE(vuser->unix_homedir);
 307                 SAFE_FREE(vuser->logon_script);
 308
 309                 SAFE_FREE(vuser);
 310                 return UID_FIELD_INVALID;
 311         }
 312
 313         /* use this to keep tabs on all our info from the authentication */
 314         vuser->server_info = server_info;
 315
 316         DEBUG(3,("UNIX uid %d is UNIX user %s, and will be vuid %u\n",
 317                  (int)vuser->uid,vuser->user.unix_name, vuser->vuid));
 318
 319         next_vuid++;
 320         num_validated_vuids++;
 321
 322         DLIST_ADD(validated_users, vuser);
 323
 324         if (!session_claim(vuser)) {
 325                 DEBUG(1, ("Failed to claim session for vuid=%d\n",
 326                           vuser->vuid));
 327                 invalidate_vuid(vuser->vuid);
 328                 return UID_FIELD_INVALID;
 329         }
 330
 331         /* Register a home dir service for this user iff
 332
 333            (a) This is not a guest connection,
 334            (b) we have a home directory defined
 335            (c) there s not an existing static share by that name
 336
 337            If a share exists by this name (autoloaded or not) reuse it . */
 338
 339         vuser->homes_snum = -1;
 340
 341         if ( (!vuser->guest) && vuser->unix_homedir && *(vuser->unix_homedir))
 342         {
 343                 int servicenumber = lp_servicenumber(vuser->user.unix_name);
 344
 345                 if ( servicenumber == -1 ) {
 346                         DEBUG(3, ("Adding homes service for user '%s' using "
 347                                   "home directory: '%s'\n",
 348                                 vuser->user.unix_name, vuser->unix_homedir));
 349                         vuser->homes_snum =
 350                                 add_home_service(vuser->user.unix_name,
 351                                                  vuser->user.unix_name,
 352                                                  vuser->unix_homedir);
 353                 } else {
 354                         DEBUG(3, ("Using static (or previously created) "
 355                                   "service for user '%s'; path = '%s'\n",
 356                                   vuser->user.unix_name,
 357                                   lp_pathname(servicenumber) ));
 358                         vuser->homes_snum = servicenumber;
 359                 }
 360         }
 361
 362         if (srv_is_signing_negotiated() && !vuser->guest &&
 363             !srv_signing_started()) {
 364                 /* Try and turn on server signing on the first non-guest
 365                  * sessionsetup. */
 366                 srv_set_signing(vuser->session_key, response_blob);
 367         }
 368
 369         /* fill in the current_user_info struct */
 370         set_current_user_info( &vuser->user );
 371
 372
 373         return vuser->vuid;
 374 }
 375
 376 /****************************************************************************
 377  Add a name to the session users list.
 378 ****************************************************************************/
 379
 380 void add_session_user(const char *user)
 381 {
 382         fstring suser;
 383         struct passwd *passwd;
 384
 385         if (!(passwd = Get_Pwnam(user)))
 386                 return;
 387
 388         fstrcpy(suser,passwd->pw_name);
 389
 390         if(!*suser)
 391                 return;
 392
 393         if( session_userlist && in_list(suser,session_userlist,False) )
 394                 return;
 395
 396         if( !session_userlist ||
 397             (strlen(suser) + strlen(session_userlist) + 2 >=
 398              len_session_userlist) ) {
 399                 char *newlist;
 400
 401                 if (len_session_userlist > 128 * PSTRING_LEN) {
 402                         DEBUG(3,("add_session_user: session userlist already "
 403                                  "too large.\n"));
 404                         return;
 405                 }
 406                 newlist = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(
 407                         session_userlist,
 408                         len_session_userlist + PSTRING_LEN );
 409                 if( newlist == NULL ) {
 410                         DEBUG(1,("Unable to resize session_userlist\n"));
 411                         return;
 412                 }
 413                 if (!session_userlist) {
 414                         *newlist = '\0';
 415                 }
 416                 session_userlist = newlist;
 417                 len_session_userlist += PSTRING_LEN;
 418         }
 419
 420         safe_strcat(session_userlist," ",len_session_userlist-1);
 421         safe_strcat(session_userlist,suser,len_session_userlist-1);
 422 }
 423
 424 /****************************************************************************
 425  In security=share mode we need to store the client workgroup, as that's
 426   what Vista uses for the NTLMv2 calculation.
 427 ****************************************************************************/
 428
 429 void add_session_workgroup(const char *workgroup)
 430 {
 431         if (session_workgroup) {
 432                 SAFE_FREE(session_workgroup);
 433         }
 434         session_workgroup = smb_xstrdup(workgroup);
 435 }
 436
 437 /****************************************************************************
 438  In security=share mode we need to return the client workgroup, as that's
 439   what Vista uses for the NTLMv2 calculation.
 440 ****************************************************************************/
 441
 442 const char *get_session_workgroup(void)
 443 {
 444         return session_workgroup;
 445 }
 446
 447 /****************************************************************************
 448  Check if a user is in a netgroup user list. If at first we don't succeed,
 449  try lower case.
 450 ****************************************************************************/
 451
 452 BOOL user_in_netgroup(const char *user, const char *ngname)
 453 {
 454 #ifdef HAVE_NETGROUP
 455         static char *mydomain = NULL;
 456         fstring lowercase_user;
 457
 458         if (mydomain == NULL)
 459                 yp_get_default_domain(&mydomain);
 460
 461         if(mydomain == NULL) {
 462                 DEBUG(5,("Unable to get default yp domain, let's try without specifying it\n"));
 463         }
 464
 465         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 466                 user, mydomain?mydomain:"(ANY)", ngname));
 467
 468         if (innetgr(ngname, NULL, user, mydomain)) {
 469                 DEBUG(5,("user_in_netgroup: Found\n"));
 470                 return (True);
 471         } else {
 472
 473                 /*
 474                  * Ok, innetgr is case sensitive. Try once more with lowercase
 475                  * just in case. Attempt to fix #703. JRA.
 476                  */
 477
 478                 fstrcpy(lowercase_user, user);
 479                 strlower_m(lowercase_user);
 480
 481                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 482                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 483
 484                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 485                         DEBUG(5,("user_in_netgroup: Found\n"));
 486                         return (True);
 487                 }
 488         }
 489 #endif /* HAVE_NETGROUP */
 490         return False;
 491 }
 492
 493 /****************************************************************************
 494  Check if a user is in a user list - can check combinations of UNIX
 495  and netgroup lists.
 496 ****************************************************************************/
 497
 498 BOOL user_in_list(const char *user,const char **list)
 499 {
 500         if (!list || !*list)
 501                 return False;
 502
 503         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 504
 505         while (*list) {
 506
 507                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 508                           user, *list));
 509
 510                 /*
 511                  * Check raw username.
 512                  */
 513                 if (strequal(user, *list))
 514                         return(True);
 515
 516                 /*
 517                  * Now check to see if any combination
 518                  * of UNIX and netgroups has been specified.
 519                  */
 520
 521                 if(**list == '@') {
 522                         /*
 523                          * Old behaviour. Check netgroup list
 524                          * followed by UNIX list.
 525                          */
 526                         if(user_in_netgroup(user, *list +1))
 527                                 return True;
 528                         if(user_in_group(user, *list +1))
 529                                 return True;
 530                 } else if (**list == '+') {
 531
 532                         if((*(*list +1)) == '&') {
 533                                 /*
 534                                  * Search UNIX list followed by netgroup.
 535                                  */
 536                                 if(user_in_group(user, *list +2))
 537                                         return True;
 538                                 if(user_in_netgroup(user, *list +2))
 539                                         return True;
 540
 541                         } else {
 542
 543                                 /*
 544                                  * Just search UNIX list.
 545                                  */
 546
 547                                 if(user_in_group(user, *list +1))
 548                                         return True;
 549                         }
 550
 551                 } else if (**list == '&') {
 552
 553                         if(*(*list +1) == '+') {
 554                                 /*
 555                                  * Search netgroup list followed by UNIX list.
 556                                  */
 557                                 if(user_in_netgroup(user, *list +2))
 558                                         return True;
 559                                 if(user_in_group(user, *list +2))
 560                                         return True;
 561                         } else {
 562                                 /*
 563                                  * Just search netgroup list.
 564                                  */
 565                                 if(user_in_netgroup(user, *list +1))
 566                                         return True;
 567                         }
 568                 }
 569
 570                 list++;
 571         }
 572         return(False);
 573 }
 574
 575 /****************************************************************************
 576  Check if a username is valid.
 577 ****************************************************************************/
 578
 579 static BOOL user_ok(const char *user, int snum)
 580 {
 581         char **valid, **invalid;
 582         BOOL ret;
 583
 584         valid = invalid = NULL;
 585         ret = True;
 586
 587         if (lp_invalid_users(snum)) {
 588                 str_list_copy(&invalid, lp_invalid_users(snum));
 589                 if (invalid &&
 590                     str_list_substitute(invalid, "%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 ( invalid && str_list_sub_basic(invalid, "", "") ) {
 596                                 ret = !user_in_list(user,
 597                                                     (const char **)invalid);
 598                         }
 599                 }
 600         }
 601         if (invalid)
 602                 str_list_free (&invalid);
 603
 604         if (ret && lp_valid_users(snum)) {
 605                 str_list_copy(&valid, lp_valid_users(snum));
 606                 if ( valid &&
 607                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 608
 609                         /* This is used in sec=share only, so no current user
 610                          * around to pass to str_list_sub_basic() */
 611
 612                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 613                                 ret = user_in_list(user, (const char **)valid);
 614                         }
 615                 }
 616         }
 617         if (valid)
 618                 str_list_free (&valid);
 619
 620         if (ret && lp_onlyuser(snum)) {
 621                 char **user_list = str_list_make (lp_username(snum), NULL);
 622                 if (user_list &&
 623                     str_list_substitute(user_list, "%S",
 624                                         lp_servicename(snum))) {
 625                         ret = user_in_list(user, (const char **)user_list);
 626                 }
 627                 if (user_list) str_list_free (&user_list);
 628         }
 629
 630         return(ret);
 631 }
 632
 633 /****************************************************************************
 634  Validate a group username entry. Return the username or NULL.
 635 ****************************************************************************/
 636
 637 static char *validate_group(char *group, DATA_BLOB password,int snum)
 638 {
 639 #ifdef HAVE_NETGROUP
 640         {
 641                 char *host, *user, *domain;
 642                 setnetgrent(group);
 643                 while (getnetgrent(&host, &user, &domain)) {
 644                         if (user) {
 645                                 if (user_ok(user, snum) &&
 646                                     password_ok(user,password)) {
 647                                         endnetgrent();
 648                                         return(user);
 649                                 }
 650                         }
 651                 }
 652                 endnetgrent();
 653         }
 654 #endif
 655
 656 #ifdef HAVE_GETGRENT
 657         {
 658                 struct group *gptr;
 659                 setgrent();
 660                 while ((gptr = (struct group *)getgrent())) {
 661                         if (strequal(gptr->gr_name,group))
 662                                 break;
 663                 }
 664
 665                 /*
 666                  * As user_ok can recurse doing a getgrent(), we must
 667                  * copy the member list into a pstring on the stack before
 668                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 669                  */
 670
 671                 if (gptr) {
 672                         pstring member_list;
 673                         char *member;
 674                         size_t copied_len = 0;
 675                         int i;
 676
 677                         *member_list = '\0';
 678                         member = member_list;
 679
 680                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 681                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 682                                 if(copied_len+member_len < sizeof(pstring)) {
 683
 684                                         DEBUG(10,("validate_group: = gr_mem = "
 685                                                   "%s\n", gptr->gr_mem[i]));
 686
 687                                         safe_strcpy(member, gptr->gr_mem[i],
 688                                                     sizeof(pstring) -
 689                                                     copied_len - 1);
 690                                         copied_len += member_len;
 691                                         member += copied_len;
 692                                 } else {
 693                                         *member = '\0';
 694                                 }
 695                         }
 696
 697                         endgrent();
 698
 699                         member = member_list;
 700                         while (*member) {
 701                                 static fstring name;
 702                                 fstrcpy(name,member);
 703                                 if (user_ok(name,snum) &&
 704                                     password_ok(name,password)) {
 705                                         endgrent();
 706                                         return(&name[0]);
 707                                 }
 708
 709                                 DEBUG(10,("validate_group = member = %s\n",
 710                                           member));
 711
 712                                 member += strlen(member) + 1;
 713                         }
 714                 } else {
 715                         endgrent();
 716                         return NULL;
 717                 }
 718         }
 719 #endif
 720         return(NULL);
 721 }
 722
 723 /****************************************************************************
 724  Check for authority to login to a service with a given username/password.
 725  Note this is *NOT* used when logging on using sessionsetup_and_X.
 726 ****************************************************************************/
 727
 728 BOOL authorise_login(int snum, fstring user, DATA_BLOB password,
 729                      BOOL *guest)
 730 {
 731         BOOL ok = False;
 732
 733 #ifdef DEBUG_PASSWORD
 734         DEBUG(100,("authorise_login: checking authorisation on "
 735                    "user=%s pass=%s\n", user,password.data));
 736 #endif
 737
 738         *guest = False;
 739
 740         /* there are several possibilities:
 741                 1) login as the given user with given password
 742                 2) login as a previously registered username with the given
 743                    password
 744                 3) login as a session list username with the given password
 745                 4) login as a previously validated user/password pair
 746                 5) login as the "user =" user with given password
 747                 6) login as the "user =" user with no password
 748                    (guest connection)
 749                 7) login as guest user with no password
 750
 751                 if the service is guest_only then steps 1 to 5 are skipped
 752         */
 753
 754         /* now check the list of session users */
 755         if (!ok) {
 756                 char *auser;
 757                 char *user_list = NULL;
 758
 759                 if ( session_userlist )
 760                         user_list = SMB_STRDUP(session_userlist);
 761                 else
 762                         user_list = SMB_STRDUP("");
 763
 764                 if (!user_list)
 765                         return(False);
 766
 767                 for (auser=strtok(user_list,LIST_SEP); !ok && auser;
 768                      auser = strtok(NULL,LIST_SEP)) {
 769                         fstring user2;
 770                         fstrcpy(user2,auser);
 771                         if (!user_ok(user2,snum))
 772                                 continue;
 773
 774                         if (password_ok(user2,password)) {
 775                                 ok = True;
 776                                 fstrcpy(user,user2);
 777                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 778                                          "list username (%s) and given "
 779                                          "password ok\n", user));
 780                         }
 781                 }
 782
 783                 SAFE_FREE(user_list);
 784         }
 785
 786         /* check the user= fields and the given password */
 787         if (!ok && lp_username(snum)) {
 788                 char *auser;
 789                 pstring user_list;
 790                 pstrcpy(user_list,lp_username(snum));
 791
 792                 pstring_sub(user_list,"%S",lp_servicename(snum));
 793
 794                 for (auser=strtok(user_list,LIST_SEP); auser && !ok;
 795                      auser = strtok(NULL,LIST_SEP)) {
 796                         if (*auser == '@') {
 797                                 auser = validate_group(auser+1,password,snum);
 798                                 if (auser) {
 799                                         ok = True;
 800                                         fstrcpy(user,auser);
 801                                         DEBUG(3,("authorise_login: ACCEPTED: "
 802                                                  "group username and given "
 803                                                  "password ok (%s)\n", user));
 804                                 }
 805                         } else {
 806                                 fstring user2;
 807                                 fstrcpy(user2,auser);
 808                                 if (user_ok(user2,snum) &&
 809                                     password_ok(user2,password)) {
 810                                         ok = True;
 811                                         fstrcpy(user,user2);
 812                                         DEBUG(3,("authorise_login: ACCEPTED: "
 813                                                  "user list username and "
 814                                                  "given password ok (%s)\n",
 815                                                  user));
 816                                 }
 817                         }
 818                 }
 819         }
 820
 821         /* check for a normal guest connection */
 822         if (!ok && GUEST_OK(snum)) {
 823                 fstring guestname;
 824                 fstrcpy(guestname,lp_guestaccount());
 825                 if (Get_Pwnam(guestname)) {
 826                         fstrcpy(user,guestname);
 827                         ok = True;
 828                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 829                                  "and guest ok (%s)\n", user));
 830                 } else {
 831                         DEBUG(0,("authorise_login: Invalid guest account "
 832                                  "%s??\n",guestname));
 833                 }
 834                 *guest = True;
 835         }
 836
 837         if (ok && !user_ok(user, snum)) {
 838                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 839                 ok = False;
 840         }
 841
 842         return(ok);
 843 }