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 /* 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,
  80                         SERVER_ALLOCATED_REQUIRED_YES);
  81 }
  82
  83 bool is_partial_auth_vuid(uint16 vuid)
  84 {
  85         if (vuid == UID_FIELD_INVALID) {
  86                 return False;
  87         }
  88         return get_valid_user_struct_internal(vuid,
  89                         SERVER_ALLOCATED_REQUIRED_NO) ? True : False;
  90 }
  91
  92 /****************************************************************************
  93  Get the user struct of a partial NTLMSSP login
  94 ****************************************************************************/
  95
  96 user_struct *get_partial_auth_user_struct(uint16 vuid)
  97 {
  98         return get_valid_user_struct_internal(vuid,
  99                         SERVER_ALLOCATED_REQUIRED_NO);
 100 }
 101
 102 /****************************************************************************
 103  Invalidate a uid.
 104 ****************************************************************************/
 105
 106 void invalidate_vuid(uint16 vuid)
 107 {
 108         user_struct *vuser = NULL;
 109
 110         if (vuid == UID_FIELD_INVALID) {
 111                 return;
 112         }
 113
 114         vuser = get_valid_user_struct_internal(vuid,
 115                         SERVER_ALLOCATED_REQUIRED_ANY);
 116         if (vuser == NULL) {
 117                 return;
 118         }
 119
 120         session_yield(vuser);
 121
 122         data_blob_free(&vuser->session_key);
 123
 124         if (vuser->auth_ntlmssp_state) {
 125                 auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
 126         }
 127
 128         DLIST_REMOVE(validated_users, vuser);
 129
 130         /* clear the vuid from the 'cache' on each connection, and
 131            from the vuid 'owner' of connections */
 132         conn_clear_vuid_cache(vuid);
 133
 134         TALLOC_FREE(vuser);
 135         num_validated_vuids--;
 136 }
 137
 138 /****************************************************************************
 139  Invalidate all vuid entries for this process.
 140 ****************************************************************************/
 141
 142 void invalidate_all_vuids(void)
 143 {
 144         user_struct *usp, *next=NULL;
 145
 146         for (usp=validated_users;usp;usp=next) {
 147                 next = usp->next;
 148                 invalidate_vuid(usp->vuid);
 149         }
 150 }
 151
 152 /****************************************************
 153  Create a new partial auth user struct.
 154 *****************************************************/
 155
 156 int register_initial_vuid(void)
 157 {
 158         user_struct *vuser;
 159
 160         /* Paranoia check. */
 161         if(lp_security() == SEC_SHARE) {
 162                 smb_panic("register_initial_vuid: "
 163                         "Tried to register uid in security=share");
 164         }
 165
 166         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 167         if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 168                 return UID_FIELD_INVALID;
 169         }
 170
 171         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 172                 DEBUG(0,("register_initial_vuid: "
 173                                 "Failed to talloc users struct!\n"));
 174                 return UID_FIELD_INVALID;
 175         }
 176
 177         /* Allocate a free vuid. Yes this is a linear search... */
 178         while( get_valid_user_struct_internal(next_vuid,
 179                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 180                 next_vuid++;
 181                 /* Check for vuid wrap. */
 182                 if (next_vuid == UID_FIELD_INVALID) {
 183                         next_vuid = VUID_OFFSET;
 184                 }
 185         }
 186
 187         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 188                 (unsigned int)next_vuid ));
 189
 190         vuser->vuid = next_vuid;
 191
 192         /*
 193          * This happens in an unfinished NTLMSSP session setup. We
 194          * need to allocate a vuid between the first and second calls
 195          * to NTLMSSP.
 196          */
 197         next_vuid++;
 198         num_validated_vuids++;
 199
 200         DLIST_ADD(validated_users, vuser);
 201         return vuser->vuid;
 202 }
 203
 204 static int register_homes_share(const char *username)
 205 {
 206         int result;
 207         struct passwd *pwd;
 208
 209         result = lp_servicenumber(username);
 210         if (result != -1) {
 211                 DEBUG(3, ("Using static (or previously created) service for "
 212                           "user '%s'; path = '%s'\n", username,
 213                           lp_pathname(result)));
 214                 return result;
 215         }
 216
 217         pwd = getpwnam_alloc(talloc_tos(), username);
 218
 219         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 220                 DEBUG(3, ("No home directory defined for user '%s'\n",
 221                           username));
 222                 TALLOC_FREE(pwd);
 223                 return -1;
 224         }
 225
 226         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 227                   "'%s'\n", username, pwd->pw_dir));
 228
 229         result = add_home_service(username, username, pwd->pw_dir);
 230
 231         TALLOC_FREE(pwd);
 232         return result;
 233 }
 234
 235 /**
 236  *  register that a valid login has been performed, establish 'session'.
 237  *  @param server_info The token returned from the authentication process.
 238  *   (now 'owned' by register_existing_vuid)
 239  *
 240  *  @param session_key The User session key for the login session (now also
 241  *  'owned' by register_existing_vuid)
 242  *
 243  *  @param respose_blob The NT challenge-response, if available.  (May be
 244  *  freed after this call)
 245  *
 246  *  @param smb_name The untranslated name of the user
 247  *
 248  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 249  *   tell random client vuid's (normally zero) from valid vuids.)
 250  *
 251  */
 252
 253 int register_existing_vuid(uint16 vuid,
 254                         auth_serversupplied_info *server_info,
 255                         DATA_BLOB session_key,
 256                         DATA_BLOB response_blob,
 257                         const char *smb_name)
 258 {
 259         user_struct *vuser = get_partial_auth_user_struct(vuid);
 260         if (!vuser) {
 261                 goto fail;
 262         }
 263
 264         /* Use this to keep tabs on all our info from the authentication */
 265         vuser->server_info = server_info;
 266
 267         /* Ensure that the server_info will disappear with
 268          * the vuser it is now attached to */
 269
 270         talloc_steal(vuser, vuser->server_info);
 271
 272         vuser->guest = server_info->guest;
 273         fstrcpy(vuser->user.unix_name, server_info->unix_name);
 274
 275         /* This is a potentially untrusted username */
 276         alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
 277                 sizeof(vuser->user.smb_name));
 278
 279         fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
 280         fstrcpy(vuser->user.full_name,
 281         pdb_get_fullname(server_info->sam_account));
 282
 283         vuser->session_key = session_key;
 284
 285         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 286                         (unsigned int)vuser->server_info->uid,
 287                         (unsigned int)vuser->server_info->gid,
 288                         vuser->user.unix_name, vuser->user.smb_name,
 289                         vuser->user.domain, vuser->guest ));
 290
 291         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 292                 "Real name: %s\n", vuser->user.unix_name,
 293                 vuser->user.full_name));
 294
 295         if (!server_info->ptok) {
 296                 DEBUG(1, ("register_existing_vuid: server_info does not "
 297                         "contain a user_token - cannot continue\n"));
 298                 goto fail;
 299         }
 300
 301         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 302                 "and will be vuid %u\n", (int)vuser->server_info->uid,
 303                  vuser->user.unix_name, vuser->vuid));
 304
 305         next_vuid++;
 306         num_validated_vuids++;
 307
 308         if (!session_claim(vuser)) {
 309                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 310                         "for vuid=%d\n",
 311                         vuser->vuid));
 312                 goto fail;
 313         }
 314
 315         /* Register a home dir service for this user if
 316         (a) This is not a guest connection,
 317         (b) we have a home directory defined
 318         (c) there s not an existing static share by that name
 319         If a share exists by this name (autoloaded or not) reuse it . */
 320
 321         vuser->homes_snum = -1;
 322
 323         if (!vuser->guest) {
 324                 vuser->homes_snum = register_homes_share(
 325                         vuser->user.unix_name);
 326         }
 327
 328         if (srv_is_signing_negotiated() && !vuser->guest &&
 329                         !srv_signing_started()) {
 330                 /* Try and turn on server signing on the first non-guest
 331                  * sessionsetup. */
 332                 srv_set_signing(vuser->session_key, response_blob);
 333         }
 334
 335         /* fill in the current_user_info struct */
 336         set_current_user_info( &vuser->user );
 337         return vuser->vuid;
 338
 339   fail:
 340
 341         if (vuser) {
 342                 invalidate_vuid(vuid);
 343         }
 344         return UID_FIELD_INVALID;
 345 }
 346
 347 /****************************************************************************
 348  Add a name to the session users list.
 349 ****************************************************************************/
 350
 351 void add_session_user(const char *user)
 352 {
 353         struct passwd *pw;
 354         char *tmp;
 355
 356         pw = Get_Pwnam_alloc(talloc_tos(), user);
 357
 358         if (pw == NULL) {
 359                 return;
 360         }
 361
 362         if (session_userlist == NULL) {
 363                 session_userlist = SMB_STRDUP(pw->pw_name);
 364                 goto done;
 365         }
 366
 367         if (in_list(pw->pw_name,session_userlist,False) ) {
 368                 goto done;
 369         }
 370
 371         if (strlen(session_userlist) > 128 * 1024) {
 372                 DEBUG(3,("add_session_user: session userlist already "
 373                          "too large.\n"));
 374                 goto done;
 375         }
 376
 377         if (asprintf(&tmp, "%s %s", session_userlist, pw->pw_name) == -1) {
 378                 DEBUG(3, ("asprintf failed\n"));
 379                 goto done;
 380         }
 381
 382         SAFE_FREE(session_userlist);
 383         session_userlist = tmp;
 384  done:
 385         TALLOC_FREE(pw);
 386 }
 387
 388 /****************************************************************************
 389  In security=share mode we need to store the client workgroup, as that's
 390   what Vista uses for the NTLMv2 calculation.
 391 ****************************************************************************/
 392
 393 void add_session_workgroup(const char *workgroup)
 394 {
 395         if (session_workgroup) {
 396                 SAFE_FREE(session_workgroup);
 397         }
 398         session_workgroup = smb_xstrdup(workgroup);
 399 }
 400
 401 /****************************************************************************
 402  In security=share mode we need to return the client workgroup, as that's
 403   what Vista uses for the NTLMv2 calculation.
 404 ****************************************************************************/
 405
 406 const char *get_session_workgroup(void)
 407 {
 408         return session_workgroup;
 409 }
 410
 411 /****************************************************************************
 412  Check if a user is in a netgroup user list. If at first we don't succeed,
 413  try lower case.
 414 ****************************************************************************/
 415
 416 bool user_in_netgroup(const char *user, const char *ngname)
 417 {
 418 #ifdef HAVE_NETGROUP
 419         static char *mydomain = NULL;
 420         fstring lowercase_user;
 421
 422         if (mydomain == NULL)
 423                 yp_get_default_domain(&mydomain);
 424
 425         if(mydomain == NULL) {
 426                 DEBUG(5,("Unable to get default yp domain, "
 427                         "let's try without specifying it\n"));
 428         }
 429
 430         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 431                 user, mydomain?mydomain:"(ANY)", ngname));
 432
 433         if (innetgr(ngname, NULL, user, mydomain)) {
 434                 DEBUG(5,("user_in_netgroup: Found\n"));
 435                 return (True);
 436         } else {
 437
 438                 /*
 439                  * Ok, innetgr is case sensitive. Try once more with lowercase
 440                  * just in case. Attempt to fix #703. JRA.
 441                  */
 442
 443                 fstrcpy(lowercase_user, user);
 444                 strlower_m(lowercase_user);
 445
 446                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 447                         lowercase_user, mydomain?mydomain:"(ANY)", ngname));
 448
 449                 if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
 450                         DEBUG(5,("user_in_netgroup: Found\n"));
 451                         return (True);
 452                 }
 453         }
 454 #endif /* HAVE_NETGROUP */
 455         return False;
 456 }
 457
 458 /****************************************************************************
 459  Check if a user is in a user list - can check combinations of UNIX
 460  and netgroup lists.
 461 ****************************************************************************/
 462
 463 bool user_in_list(const char *user,const char **list)
 464 {
 465         if (!list || !*list)
 466                 return False;
 467
 468         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 469
 470         while (*list) {
 471
 472                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 473                           user, *list));
 474
 475                 /*
 476                  * Check raw username.
 477                  */
 478                 if (strequal(user, *list))
 479                         return(True);
 480
 481                 /*
 482                  * Now check to see if any combination
 483                  * of UNIX and netgroups has been specified.
 484                  */
 485
 486                 if(**list == '@') {
 487                         /*
 488                          * Old behaviour. Check netgroup list
 489                          * followed by UNIX list.
 490                          */
 491                         if(user_in_netgroup(user, *list +1))
 492                                 return True;
 493                         if(user_in_group(user, *list +1))
 494                                 return True;
 495                 } else if (**list == '+') {
 496
 497                         if((*(*list +1)) == '&') {
 498                                 /*
 499                                  * Search UNIX list followed by netgroup.
 500                                  */
 501                                 if(user_in_group(user, *list +2))
 502                                         return True;
 503                                 if(user_in_netgroup(user, *list +2))
 504                                         return True;
 505
 506                         } else {
 507
 508                                 /*
 509                                  * Just search UNIX list.
 510                                  */
 511
 512                                 if(user_in_group(user, *list +1))
 513                                         return True;
 514                         }
 515
 516                 } else if (**list == '&') {
 517
 518                         if(*(*list +1) == '+') {
 519                                 /*
 520                                  * Search netgroup list followed by UNIX list.
 521                                  */
 522                                 if(user_in_netgroup(user, *list +2))
 523                                         return True;
 524                                 if(user_in_group(user, *list +2))
 525                                         return True;
 526                         } else {
 527                                 /*
 528                                  * Just search netgroup list.
 529                                  */
 530                                 if(user_in_netgroup(user, *list +1))
 531                                         return True;
 532                         }
 533                 }
 534
 535                 list++;
 536         }
 537         return(False);
 538 }
 539
 540 /****************************************************************************
 541  Check if a username is valid.
 542 ****************************************************************************/
 543
 544 static bool user_ok(const char *user, int snum)
 545 {
 546         char **valid, **invalid;
 547         bool ret;
 548
 549         valid = invalid = NULL;
 550         ret = True;
 551
 552         if (lp_invalid_users(snum)) {
 553                 str_list_copy(talloc_tos(), &invalid, lp_invalid_users(snum));
 554                 if (invalid &&
 555                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 556
 557                         /* This is used in sec=share only, so no current user
 558                          * around to pass to str_list_sub_basic() */
 559
 560                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 561                                 ret = !user_in_list(user,
 562                                                     (const char **)invalid);
 563                         }
 564                 }
 565         }
 566         TALLOC_FREE(invalid);
 567
 568         if (ret && lp_valid_users(snum)) {
 569                 str_list_copy(talloc_tos(), &valid, lp_valid_users(snum));
 570                 if ( valid &&
 571                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 572
 573                         /* This is used in sec=share only, so no current user
 574                          * around to pass to str_list_sub_basic() */
 575
 576                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 577                                 ret = user_in_list(user, (const char **)valid);
 578                         }
 579                 }
 580         }
 581         TALLOC_FREE(valid);
 582
 583         if (ret && lp_onlyuser(snum)) {
 584                 char **user_list = str_list_make(
 585                         talloc_tos(), lp_username(snum), NULL);
 586                 if (user_list &&
 587                     str_list_substitute(user_list, "%S",
 588                                         lp_servicename(snum))) {
 589                         ret = user_in_list(user, (const char **)user_list);
 590                 }
 591                 TALLOC_FREE(user_list);
 592         }
 593
 594         return(ret);
 595 }
 596
 597 /****************************************************************************
 598  Validate a group username entry. Return the username or NULL.
 599 ****************************************************************************/
 600
 601 static char *validate_group(char *group, DATA_BLOB password,int snum)
 602 {
 603 #ifdef HAVE_NETGROUP
 604         {
 605                 char *host, *user, *domain;
 606                 setnetgrent(group);
 607                 while (getnetgrent(&host, &user, &domain)) {
 608                         if (user) {
 609                                 if (user_ok(user, snum) &&
 610                                     password_ok(user,password)) {
 611                                         endnetgrent();
 612                                         return(user);
 613                                 }
 614                         }
 615                 }
 616                 endnetgrent();
 617         }
 618 #endif
 619
 620 #ifdef HAVE_GETGRENT
 621         {
 622                 struct group *gptr;
 623                 setgrent();
 624                 while ((gptr = (struct group *)getgrent())) {
 625                         if (strequal(gptr->gr_name,group))
 626                                 break;
 627                 }
 628
 629                 /*
 630                  * As user_ok can recurse doing a getgrent(), we must
 631                  * copy the member list onto the heap before
 632                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 633                  */
 634
 635                 if (gptr) {
 636                         char *member_list = NULL;
 637                         size_t list_len = 0;
 638                         char *member;
 639                         int i;
 640
 641                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 642                                 list_len += strlen(gptr->gr_mem[i])+1;
 643                         }
 644                         list_len++;
 645
 646                         member_list = (char *)SMB_MALLOC(list_len);
 647                         if (!member_list) {
 648                                 endgrent();
 649                                 return NULL;
 650                         }
 651
 652                         *member_list = '\0';
 653                         member = member_list;
 654
 655                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 656                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 657
 658                                 DEBUG(10,("validate_group: = gr_mem = "
 659                                           "%s\n", gptr->gr_mem[i]));
 660
 661                                 safe_strcpy(member, gptr->gr_mem[i],
 662                                         list_len - (member-member_list));
 663                                 member += member_len;
 664                         }
 665
 666                         endgrent();
 667
 668                         member = member_list;
 669                         while (*member) {
 670                                 if (user_ok(member,snum) &&
 671                                     password_ok(member,password)) {
 672                                         char *name = talloc_strdup(talloc_tos(),
 673                                                                 member);
 674                                         SAFE_FREE(member_list);
 675                                         return name;
 676                                 }
 677
 678                                 DEBUG(10,("validate_group = member = %s\n",
 679                                           member));
 680
 681                                 member += strlen(member) + 1;
 682                         }
 683
 684                         SAFE_FREE(member_list);
 685                 } else {
 686                         endgrent();
 687                         return NULL;
 688                 }
 689         }
 690 #endif
 691         return(NULL);
 692 }
 693
 694 /****************************************************************************
 695  Check for authority to login to a service with a given username/password.
 696  Note this is *NOT* used when logging on using sessionsetup_and_X.
 697 ****************************************************************************/
 698
 699 bool authorise_login(int snum, fstring user, DATA_BLOB password,
 700                      bool *guest)
 701 {
 702         bool ok = False;
 703
 704 #ifdef DEBUG_PASSWORD
 705         DEBUG(100,("authorise_login: checking authorisation on "
 706                    "user=%s pass=%s\n", user,password.data));
 707 #endif
 708
 709         *guest = False;
 710
 711         /* there are several possibilities:
 712                 1) login as the given user with given password
 713                 2) login as a previously registered username with the given
 714                    password
 715                 3) login as a session list username with the given password
 716                 4) login as a previously validated user/password pair
 717                 5) login as the "user =" user with given password
 718                 6) login as the "user =" user with no password
 719                    (guest connection)
 720                 7) login as guest user with no password
 721
 722                 if the service is guest_only then steps 1 to 5 are skipped
 723         */
 724
 725         /* now check the list of session users */
 726         if (!ok) {
 727                 char *auser;
 728                 char *user_list = NULL;
 729                 char *saveptr;
 730
 731                 if ( session_userlist )
 732                         user_list = SMB_STRDUP(session_userlist);
 733                 else
 734                         user_list = SMB_STRDUP("");
 735
 736                 if (!user_list)
 737                         return(False);
 738
 739                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 740                      !ok && auser;
 741                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 742                         fstring user2;
 743                         fstrcpy(user2,auser);
 744                         if (!user_ok(user2,snum))
 745                                 continue;
 746
 747                         if (password_ok(user2,password)) {
 748                                 ok = True;
 749                                 fstrcpy(user,user2);
 750                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 751                                          "list username (%s) and given "
 752                                          "password ok\n", user));
 753                         }
 754                 }
 755
 756                 SAFE_FREE(user_list);
 757         }
 758
 759         /* check the user= fields and the given password */
 760         if (!ok && lp_username(snum)) {
 761                 TALLOC_CTX *ctx = talloc_tos();
 762                 char *auser;
 763                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 764                 char *saveptr;
 765
 766                 if (!user_list) {
 767                         goto check_guest;
 768                 }
 769
 770                 user_list = talloc_string_sub(ctx,
 771                                 user_list,
 772                                 "%S",
 773                                 lp_servicename(snum));
 774
 775                 if (!user_list) {
 776                         goto check_guest;
 777                 }
 778
 779                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 780                      auser && !ok;
 781                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 782                         if (*auser == '@') {
 783                                 auser = validate_group(auser+1,password,snum);
 784                                 if (auser) {
 785                                         ok = True;
 786                                         fstrcpy(user,auser);
 787                                         DEBUG(3,("authorise_login: ACCEPTED: "
 788                                                  "group username and given "
 789                                                  "password ok (%s)\n", user));
 790                                 }
 791                         } else {
 792                                 fstring user2;
 793                                 fstrcpy(user2,auser);
 794                                 if (user_ok(user2,snum) &&
 795                                     password_ok(user2,password)) {
 796                                         ok = True;
 797                                         fstrcpy(user,user2);
 798                                         DEBUG(3,("authorise_login: ACCEPTED: "
 799                                                  "user list username and "
 800                                                  "given password ok (%s)\n",
 801                                                  user));
 802                                 }
 803                         }
 804                 }
 805         }
 806
 807   check_guest:
 808
 809         /* check for a normal guest connection */
 810         if (!ok && GUEST_OK(snum)) {
 811                 struct passwd *guest_pw;
 812                 fstring guestname;
 813                 fstrcpy(guestname,lp_guestaccount());
 814                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 815                 if (guest_pw != NULL) {
 816                         fstrcpy(user,guestname);
 817                         ok = True;
 818                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 819                                  "and guest ok (%s)\n", user));
 820                 } else {
 821                         DEBUG(0,("authorise_login: Invalid guest account "
 822                                  "%s??\n",guestname));
 823                 }
 824                 TALLOC_FREE(guest_pw);
 825                 *guest = True;
 826         }
 827
 828         if (ok && !user_ok(user, snum)) {
 829                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 830                 ok = False;
 831         }
 832
 833         return(ok);
 834 }