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 #include "smbd/globals.h"
  23
  24 /* Fix up prototypes for OSX 10.4, where they're missing */
  25 #ifndef HAVE_SETNETGRENT_PROTOTYPE
  26 extern int setnetgrent(const char* netgroup);
  27 #endif
  28 #ifndef HAVE_GETNETGRENT_PROTOTYPE
  29 extern int getnetgrent(char **host, char **user, char **domain);
  30 #endif
  31 #ifndef HAVE_ENDNETGRENT_PROTOTYPE
  32 extern void endnetgrent(void);
  33 #endif
  34
  35 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  36                                 SERVER_ALLOCATED_REQUIRED_NO,
  37                                 SERVER_ALLOCATED_REQUIRED_ANY};
  38
  39 static user_struct *get_valid_user_struct_internal(
  40                         struct smbd_server_connection *sconn,
  41                         uint16 vuid,
  42                         enum server_allocated_state server_allocated)
  43 {
  44         user_struct *usp;
  45         int count=0;
  46
  47         if (vuid == UID_FIELD_INVALID)
  48                 return NULL;
  49
  50         usp=sconn->smb1.sessions.validated_users;
  51         for (;usp;usp=usp->next,count++) {
  52                 if (vuid == usp->vuid) {
  53                         switch (server_allocated) {
  54                                 case SERVER_ALLOCATED_REQUIRED_YES:
  55                                         if (usp->server_info == NULL) {
  56                                                 continue;
  57                                         }
  58                                         break;
  59                                 case SERVER_ALLOCATED_REQUIRED_NO:
  60                                         if (usp->server_info != NULL) {
  61                                                 continue;
  62                                         }
  63                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  64                                         break;
  65                         }
  66                         if (count > 10) {
  67                                 DLIST_PROMOTE(sconn->smb1.sessions.validated_users,
  68                                               usp);
  69                         }
  70                         return usp;
  71                 }
  72         }
  73
  74         return NULL;
  75 }
  76
  77 /****************************************************************************
  78  Check if a uid has been validated, and return an pointer to the user_struct
  79  if it has. NULL if not. vuid is biased by an offset. This allows us to
  80  tell random client vuid's (normally zero) from valid vuids.
  81 ****************************************************************************/
  82
  83 user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
  84                                    uint16 vuid)
  85 {
  86         return get_valid_user_struct_internal(sconn, vuid,
  87                         SERVER_ALLOCATED_REQUIRED_YES);
  88 }
  89
  90 bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
  91 {
  92         return (get_partial_auth_user_struct(sconn, vuid) != NULL);
  93 }
  94
  95 /****************************************************************************
  96  Get the user struct of a partial NTLMSSP login
  97 ****************************************************************************/
  98
  99 user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
 100                                           uint16 vuid)
 101 {
 102         return get_valid_user_struct_internal(sconn, vuid,
 103                         SERVER_ALLOCATED_REQUIRED_NO);
 104 }
 105
 106 /****************************************************************************
 107  Invalidate a uid.
 108 ****************************************************************************/
 109
 110 void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
 111 {
 112         user_struct *vuser = NULL;
 113
 114         vuser = get_valid_user_struct_internal(sconn, vuid,
 115                         SERVER_ALLOCATED_REQUIRED_ANY);
 116         if (vuser == NULL) {
 117                 return;
 118         }
 119
 120         session_yield(vuser);
 121
 122         if (vuser->auth_ntlmssp_state) {
 123                 auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
 124         }
 125
 126         DLIST_REMOVE(sconn->smb1.sessions.validated_users, vuser);
 127
 128         /* clear the vuid from the 'cache' on each connection, and
 129            from the vuid 'owner' of connections */
 130         conn_clear_vuid_caches(sconn, vuid);
 131
 132         TALLOC_FREE(vuser);
 133         sconn->smb1.sessions.num_validated_vuids--;
 134 }
 135
 136 /****************************************************************************
 137  Invalidate all vuid entries for this process.
 138 ****************************************************************************/
 139
 140 void invalidate_all_vuids(struct smbd_server_connection *sconn)
 141 {
 142         if (sconn->using_smb2) {
 143                 return;
 144         }
 145
 146         while (sconn->smb1.sessions.validated_users != NULL) {
 147                 invalidate_vuid(sconn,
 148                                 sconn->smb1.sessions.validated_users->vuid);
 149         }
 150 }
 151
 152 static void increment_next_vuid(uint16_t *vuid)
 153 {
 154         *vuid += 1;
 155
 156         /* Check for vuid wrap. */
 157         if (*vuid == UID_FIELD_INVALID) {
 158                 *vuid = VUID_OFFSET;
 159         }
 160 }
 161
 162 /****************************************************
 163  Create a new partial auth user struct.
 164 *****************************************************/
 165
 166 int register_initial_vuid(struct smbd_server_connection *sconn)
 167 {
 168         user_struct *vuser;
 169
 170         /* Paranoia check. */
 171         if(lp_security() == SEC_SHARE) {
 172                 smb_panic("register_initial_vuid: "
 173                         "Tried to register uid in security=share");
 174         }
 175
 176         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 177         if (sconn->smb1.sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 178                 return UID_FIELD_INVALID;
 179         }
 180
 181         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 182                 DEBUG(0,("register_initial_vuid: "
 183                                 "Failed to talloc users struct!\n"));
 184                 return UID_FIELD_INVALID;
 185         }
 186
 187         /* Allocate a free vuid. Yes this is a linear search... */
 188         while( get_valid_user_struct_internal(sconn,
 189                         sconn->smb1.sessions.next_vuid,
 190                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 191                 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 192         }
 193
 194         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 195                 (unsigned int)sconn->smb1.sessions.next_vuid ));
 196
 197         vuser->vuid = sconn->smb1.sessions.next_vuid;
 198
 199         /*
 200          * This happens in an unfinished NTLMSSP session setup. We
 201          * need to allocate a vuid between the first and second calls
 202          * to NTLMSSP.
 203          */
 204         increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 205         sconn->smb1.sessions.num_validated_vuids++;
 206
 207         DLIST_ADD(sconn->smb1.sessions.validated_users, vuser);
 208         return vuser->vuid;
 209 }
 210
 211 int register_homes_share(const char *username)
 212 {
 213         int result;
 214         struct passwd *pwd;
 215
 216         result = lp_servicenumber(username);
 217         if (result != -1) {
 218                 DEBUG(3, ("Using static (or previously created) service for "
 219                           "user '%s'; path = '%s'\n", username,
 220                           lp_pathname(result)));
 221                 return result;
 222         }
 223
 224         pwd = getpwnam_alloc(talloc_tos(), username);
 225
 226         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 227                 DEBUG(3, ("No home directory defined for user '%s'\n",
 228                           username));
 229                 TALLOC_FREE(pwd);
 230                 return -1;
 231         }
 232
 233         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 234                   "'%s'\n", username, pwd->pw_dir));
 235
 236         result = add_home_service(username, username, pwd->pw_dir);
 237
 238         TALLOC_FREE(pwd);
 239         return result;
 240 }
 241
 242 /**
 243  *  register that a valid login has been performed, establish 'session'.
 244  *  @param server_info The token returned from the authentication process.
 245  *   (now 'owned' by register_existing_vuid)
 246  *
 247  *  @param session_key The User session key for the login session (now also
 248  *  'owned' by register_existing_vuid)
 249  *
 250  *  @param respose_blob The NT challenge-response, if available.  (May be
 251  *  freed after this call)
 252  *
 253  *  @param smb_name The untranslated name of the user
 254  *
 255  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 256  *   tell random client vuid's (normally zero) from valid vuids.)
 257  *
 258  */
 259
 260 int register_existing_vuid(struct smbd_server_connection *sconn,
 261                         uint16 vuid,
 262                         struct auth_serversupplied_info *server_info,
 263                         DATA_BLOB response_blob,
 264                         const char *smb_name)
 265 {
 266         fstring tmp;
 267         user_struct *vuser;
 268
 269         vuser = get_partial_auth_user_struct(sconn, vuid);
 270         if (!vuser) {
 271                 goto fail;
 272         }
 273
 274         /* Use this to keep tabs on all our info from the authentication */
 275         vuser->server_info = talloc_move(vuser, &server_info);
 276
 277         /* This is a potentially untrusted username */
 278         alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
 279
 280         vuser->server_info->sanitized_username = talloc_strdup(
 281                 vuser->server_info, tmp);
 282
 283         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 284                   (unsigned int)vuser->server_info->utok.uid,
 285                   (unsigned int)vuser->server_info->utok.gid,
 286                   vuser->server_info->unix_name,
 287                   vuser->server_info->sanitized_username,
 288                   vuser->server_info->info3->base.domain.string,
 289                   vuser->server_info->guest ));
 290
 291         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 292                   "Real name: %s\n", vuser->server_info->unix_name,
 293                   vuser->server_info->info3->base.full_name.string));
 294
 295         if (!vuser->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->utok.uid,
 303                  vuser->server_info->unix_name, vuser->vuid));
 304
 305         if (!session_claim(vuser)) {
 306                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 307                         "for vuid=%d\n",
 308                         vuser->vuid));
 309                 goto fail;
 310         }
 311
 312         /* Register a home dir service for this user if
 313         (a) This is not a guest connection,
 314         (b) we have a home directory defined
 315         (c) there s not an existing static share by that name
 316         If a share exists by this name (autoloaded or not) reuse it . */
 317
 318         vuser->homes_snum = -1;
 319
 320         if (!vuser->server_info->guest) {
 321                 vuser->homes_snum = register_homes_share(
 322                         vuser->server_info->unix_name);
 323         }
 324
 325         if (srv_is_signing_negotiated(sconn) &&
 326             !vuser->server_info->guest) {
 327                 /* Try and turn on server signing on the first non-guest
 328                  * sessionsetup. */
 329                 srv_set_signing(sconn,
 330                                 vuser->server_info->user_session_key,
 331                                 response_blob);
 332         }
 333
 334         /* fill in the current_user_info struct */
 335         set_current_user_info(
 336                 vuser->server_info->sanitized_username,
 337                 vuser->server_info->unix_name,
 338                 vuser->server_info->info3->base.domain.string);
 339
 340         return vuser->vuid;
 341
 342   fail:
 343
 344         if (vuser) {
 345                 invalidate_vuid(sconn, vuid);
 346         }
 347         return UID_FIELD_INVALID;
 348 }
 349
 350 /****************************************************************************
 351  Add a name to the session users list.
 352 ****************************************************************************/
 353
 354 void add_session_user(struct smbd_server_connection *sconn,
 355                       const char *user)
 356 {
 357         struct passwd *pw;
 358         char *tmp;
 359
 360         pw = Get_Pwnam_alloc(talloc_tos(), user);
 361
 362         if (pw == NULL) {
 363                 return;
 364         }
 365
 366         if (sconn->smb1.sessions.session_userlist == NULL) {
 367                 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
 368                 goto done;
 369         }
 370
 371         if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
 372                 goto done;
 373         }
 374
 375         if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
 376                 DEBUG(3,("add_session_user: session userlist already "
 377                          "too large.\n"));
 378                 goto done;
 379         }
 380
 381         if (asprintf(&tmp, "%s %s",
 382                      sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
 383                 DEBUG(3, ("asprintf failed\n"));
 384                 goto done;
 385         }
 386
 387         SAFE_FREE(sconn->smb1.sessions.session_userlist);
 388         sconn->smb1.sessions.session_userlist = tmp;
 389  done:
 390         TALLOC_FREE(pw);
 391 }
 392
 393 /****************************************************************************
 394  In security=share mode we need to store the client workgroup, as that's
 395   what Vista uses for the NTLMv2 calculation.
 396 ****************************************************************************/
 397
 398 void add_session_workgroup(struct smbd_server_connection *sconn,
 399                            const char *workgroup)
 400 {
 401         if (sconn->smb1.sessions.session_workgroup) {
 402                 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
 403         }
 404         sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
 405 }
 406
 407 /****************************************************************************
 408  In security=share mode we need to return the client workgroup, as that's
 409   what Vista uses for the NTLMv2 calculation.
 410 ****************************************************************************/
 411
 412 const char *get_session_workgroup(struct smbd_server_connection *sconn)
 413 {
 414         return sconn->smb1.sessions.session_workgroup;
 415 }
 416
 417 /****************************************************************************
 418  Check if a username is valid.
 419 ****************************************************************************/
 420
 421 static bool user_ok(const char *user, int snum)
 422 {
 423         bool ret;
 424
 425         ret = True;
 426
 427         if (lp_invalid_users(snum)) {
 428                 char **invalid = str_list_copy(talloc_tos(),
 429                         lp_invalid_users(snum));
 430                 if (invalid &&
 431                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 432
 433                         /* This is used in sec=share only, so no current user
 434                          * around to pass to str_list_sub_basic() */
 435
 436                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 437                                 ret = !user_in_list(user,
 438                                                     (const char **)invalid);
 439                         }
 440                 }
 441                 TALLOC_FREE(invalid);
 442         }
 443
 444         if (ret && lp_valid_users(snum)) {
 445                 char **valid = str_list_copy(talloc_tos(),
 446                         lp_valid_users(snum));
 447                 if ( valid &&
 448                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 449
 450                         /* This is used in sec=share only, so no current user
 451                          * around to pass to str_list_sub_basic() */
 452
 453                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 454                                 ret = user_in_list(user,
 455                                                    (const char **)valid);
 456                         }
 457                 }
 458                 TALLOC_FREE(valid);
 459         }
 460
 461         if (ret && lp_onlyuser(snum)) {
 462                 char **user_list = str_list_make_v3(
 463                         talloc_tos(), lp_username(snum), NULL);
 464                 if (user_list &&
 465                     str_list_substitute(user_list, "%S",
 466                                         lp_servicename(snum))) {
 467                         ret = user_in_list(user,
 468                                            (const char **)user_list);
 469                 }
 470                 TALLOC_FREE(user_list);
 471         }
 472
 473         return(ret);
 474 }
 475
 476 /****************************************************************************
 477  Validate a group username entry. Return the username or NULL.
 478 ****************************************************************************/
 479
 480 static char *validate_group(struct smbd_server_connection *sconn,
 481                             char *group, DATA_BLOB password,int snum)
 482 {
 483 #ifdef HAVE_NETGROUP
 484         {
 485                 char *host, *user, *domain;
 486                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 487                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 488                 setnetgrent(group);
 489                 while (getnetgrent(&host, &user, &domain)) {
 490                         if (user) {
 491                                 if (user_ok(user, snum) &&
 492                                     password_ok(actx, enc,
 493                                                 get_session_workgroup(sconn),
 494                                                 user,password)) {
 495                                         endnetgrent();
 496                                         return(user);
 497                                 }
 498                         }
 499                 }
 500                 endnetgrent();
 501         }
 502 #endif
 503
 504 #ifdef HAVE_GETGRENT
 505         {
 506                 struct group *gptr;
 507                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 508                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 509
 510                 setgrent();
 511                 while ((gptr = (struct group *)getgrent())) {
 512                         if (strequal(gptr->gr_name,group))
 513                                 break;
 514                 }
 515
 516                 /*
 517                  * As user_ok can recurse doing a getgrent(), we must
 518                  * copy the member list onto the heap before
 519                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 520                  */
 521
 522                 if (gptr) {
 523                         char *member_list = NULL;
 524                         size_t list_len = 0;
 525                         char *member;
 526                         int i;
 527
 528                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 529                                 list_len += strlen(gptr->gr_mem[i])+1;
 530                         }
 531                         list_len++;
 532
 533                         member_list = (char *)SMB_MALLOC(list_len);
 534                         if (!member_list) {
 535                                 endgrent();
 536                                 return NULL;
 537                         }
 538
 539                         *member_list = '\0';
 540                         member = member_list;
 541
 542                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 543                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 544
 545                                 DEBUG(10,("validate_group: = gr_mem = "
 546                                           "%s\n", gptr->gr_mem[i]));
 547
 548                                 safe_strcpy(member, gptr->gr_mem[i],
 549                                         list_len - (member-member_list));
 550                                 member += member_len;
 551                         }
 552
 553                         endgrent();
 554
 555                         member = member_list;
 556                         while (*member) {
 557                                 if (user_ok(member,snum) &&
 558                                     password_ok(actx, enc,
 559                                                 get_session_workgroup(sconn),
 560                                                 member,password)) {
 561                                         char *name = talloc_strdup(talloc_tos(),
 562                                                                 member);
 563                                         SAFE_FREE(member_list);
 564                                         return name;
 565                                 }
 566
 567                                 DEBUG(10,("validate_group = member = %s\n",
 568                                           member));
 569
 570                                 member += strlen(member) + 1;
 571                         }
 572
 573                         SAFE_FREE(member_list);
 574                 } else {
 575                         endgrent();
 576                         return NULL;
 577                 }
 578         }
 579 #endif
 580         return(NULL);
 581 }
 582
 583 /****************************************************************************
 584  Check for authority to login to a service with a given username/password.
 585  Note this is *NOT* used when logging on using sessionsetup_and_X.
 586 ****************************************************************************/
 587
 588 bool authorise_login(struct smbd_server_connection *sconn,
 589                      int snum, fstring user, DATA_BLOB password,
 590                      bool *guest)
 591 {
 592         bool ok = False;
 593         struct auth_context *actx = sconn->smb1.negprot.auth_context;
 594         bool enc = sconn->smb1.negprot.encrypted_passwords;
 595
 596 #ifdef DEBUG_PASSWORD
 597         DEBUG(100,("authorise_login: checking authorisation on "
 598                    "user=%s pass=%s\n", user,password.data));
 599 #endif
 600
 601         *guest = False;
 602
 603         /* there are several possibilities:
 604                 1) login as the given user with given password
 605                 2) login as a previously registered username with the given
 606                    password
 607                 3) login as a session list username with the given password
 608                 4) login as a previously validated user/password pair
 609                 5) login as the "user =" user with given password
 610                 6) login as the "user =" user with no password
 611                    (guest connection)
 612                 7) login as guest user with no password
 613
 614                 if the service is guest_only then steps 1 to 5 are skipped
 615         */
 616
 617         /* now check the list of session users */
 618         if (!ok) {
 619                 char *auser;
 620                 char *user_list = NULL;
 621                 char *saveptr;
 622
 623                 if (sconn->smb1.sessions.session_userlist)
 624                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
 625                 else
 626                         user_list = SMB_STRDUP("");
 627
 628                 if (!user_list)
 629                         return(False);
 630
 631                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 632                      !ok && auser;
 633                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 634                         fstring user2;
 635                         fstrcpy(user2,auser);
 636                         if (!user_ok(user2,snum))
 637                                 continue;
 638
 639                         if (password_ok(actx, enc,
 640                                         get_session_workgroup(sconn),
 641                                         user2,password)) {
 642                                 ok = True;
 643                                 fstrcpy(user,user2);
 644                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 645                                          "list username (%s) and given "
 646                                          "password ok\n", user));
 647                         }
 648                 }
 649
 650                 SAFE_FREE(user_list);
 651         }
 652
 653         /* check the user= fields and the given password */
 654         if (!ok && lp_username(snum)) {
 655                 TALLOC_CTX *ctx = talloc_tos();
 656                 char *auser;
 657                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 658                 char *saveptr;
 659
 660                 if (!user_list) {
 661                         goto check_guest;
 662                 }
 663
 664                 user_list = talloc_string_sub(ctx,
 665                                 user_list,
 666                                 "%S",
 667                                 lp_servicename(snum));
 668
 669                 if (!user_list) {
 670                         goto check_guest;
 671                 }
 672
 673                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 674                      auser && !ok;
 675                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 676                         if (*auser == '@') {
 677                                 auser = validate_group(sconn,auser+1,
 678                                                        password,snum);
 679                                 if (auser) {
 680                                         ok = True;
 681                                         fstrcpy(user,auser);
 682                                         DEBUG(3,("authorise_login: ACCEPTED: "
 683                                                  "group username and given "
 684                                                  "password ok (%s)\n", user));
 685                                 }
 686                         } else {
 687                                 fstring user2;
 688                                 fstrcpy(user2,auser);
 689                                 if (user_ok(user2,snum) &&
 690                                     password_ok(actx, enc,
 691                                                 get_session_workgroup(sconn),
 692                                                 user2,password)) {
 693                                         ok = True;
 694                                         fstrcpy(user,user2);
 695                                         DEBUG(3,("authorise_login: ACCEPTED: "
 696                                                  "user list username and "
 697                                                  "given password ok (%s)\n",
 698                                                  user));
 699                                 }
 700                         }
 701                 }
 702         }
 703
 704   check_guest:
 705
 706         /* check for a normal guest connection */
 707         if (!ok && GUEST_OK(snum)) {
 708                 struct passwd *guest_pw;
 709                 fstring guestname;
 710                 fstrcpy(guestname,lp_guestaccount());
 711                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 712                 if (guest_pw != NULL) {
 713                         fstrcpy(user,guestname);
 714                         ok = True;
 715                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 716                                  "and guest ok (%s)\n", user));
 717                 } else {
 718                         DEBUG(0,("authorise_login: Invalid guest account "
 719                                  "%s??\n",guestname));
 720                 }
 721                 TALLOC_FREE(guest_pw);
 722                 *guest = True;
 723         }
 724
 725         if (ok && !user_ok(user, snum)) {
 726                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 727                 ok = False;
 728         }
 729
 730         return(ok);
 731 }