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 #include "../librpc/gen_ndr/netlogon.h"
  24
  25 /* Fix up prototypes for OSX 10.4, where they're missing */
  26 #ifndef HAVE_SETNETGRENT_PROTOTYPE
  27 extern int setnetgrent(const char* netgroup);
  28 #endif
  29 #ifndef HAVE_GETNETGRENT_PROTOTYPE
  30 extern int getnetgrent(char **host, char **user, char **domain);
  31 #endif
  32 #ifndef HAVE_ENDNETGRENT_PROTOTYPE
  33 extern void endnetgrent(void);
  34 #endif
  35
  36 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  37                                 SERVER_ALLOCATED_REQUIRED_NO,
  38                                 SERVER_ALLOCATED_REQUIRED_ANY};
  39
  40 static user_struct *get_valid_user_struct_internal(
  41                         struct smbd_server_connection *sconn,
  42                         uint16 vuid,
  43                         enum server_allocated_state server_allocated)
  44 {
  45         user_struct *usp;
  46         int count=0;
  47
  48         if (vuid == UID_FIELD_INVALID)
  49                 return NULL;
  50
  51         usp=sconn->smb1.sessions.validated_users;
  52         for (;usp;usp=usp->next,count++) {
  53                 if (vuid == usp->vuid) {
  54                         switch (server_allocated) {
  55                                 case SERVER_ALLOCATED_REQUIRED_YES:
  56                                         if (usp->server_info == NULL) {
  57                                                 continue;
  58                                         }
  59                                         break;
  60                                 case SERVER_ALLOCATED_REQUIRED_NO:
  61                                         if (usp->server_info != NULL) {
  62                                                 continue;
  63                                         }
  64                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  65                                         break;
  66                         }
  67                         if (count > 10) {
  68                                 DLIST_PROMOTE(sconn->smb1.sessions.validated_users,
  69                                               usp);
  70                         }
  71                         return usp;
  72                 }
  73         }
  74
  75         return NULL;
  76 }
  77
  78 /****************************************************************************
  79  Check if a uid has been validated, and return an pointer to the user_struct
  80  if it has. NULL if not. vuid is biased by an offset. This allows us to
  81  tell random client vuid's (normally zero) from valid vuids.
  82 ****************************************************************************/
  83
  84 user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
  85                                    uint16 vuid)
  86 {
  87         return get_valid_user_struct_internal(sconn, vuid,
  88                         SERVER_ALLOCATED_REQUIRED_YES);
  89 }
  90
  91 bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
  92 {
  93         return (get_partial_auth_user_struct(sconn, vuid) != NULL);
  94 }
  95
  96 /****************************************************************************
  97  Get the user struct of a partial NTLMSSP login
  98 ****************************************************************************/
  99
 100 user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
 101                                           uint16 vuid)
 102 {
 103         return get_valid_user_struct_internal(sconn, vuid,
 104                         SERVER_ALLOCATED_REQUIRED_NO);
 105 }
 106
 107 /****************************************************************************
 108  Invalidate a uid.
 109 ****************************************************************************/
 110
 111 void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
 112 {
 113         user_struct *vuser = NULL;
 114
 115         vuser = get_valid_user_struct_internal(sconn, vuid,
 116                         SERVER_ALLOCATED_REQUIRED_ANY);
 117         if (vuser == NULL) {
 118                 return;
 119         }
 120
 121         session_yield(vuser);
 122
 123         if (vuser->auth_ntlmssp_state) {
 124                 TALLOC_FREE(vuser->auth_ntlmssp_state);
 125         }
 126
 127         DLIST_REMOVE(sconn->smb1.sessions.validated_users, vuser);
 128
 129         /* clear the vuid from the 'cache' on each connection, and
 130            from the vuid 'owner' of connections */
 131         conn_clear_vuid_caches(sconn, vuid);
 132
 133         TALLOC_FREE(vuser);
 134         sconn->smb1.sessions.num_validated_vuids--;
 135 }
 136
 137 /****************************************************************************
 138  Invalidate all vuid entries for this process.
 139 ****************************************************************************/
 140
 141 void invalidate_all_vuids(struct smbd_server_connection *sconn)
 142 {
 143         if (sconn->using_smb2) {
 144                 return;
 145         }
 146
 147         while (sconn->smb1.sessions.validated_users != NULL) {
 148                 invalidate_vuid(sconn,
 149                                 sconn->smb1.sessions.validated_users->vuid);
 150         }
 151 }
 152
 153 static void increment_next_vuid(uint16_t *vuid)
 154 {
 155         *vuid += 1;
 156
 157         /* Check for vuid wrap. */
 158         if (*vuid == UID_FIELD_INVALID) {
 159                 *vuid = VUID_OFFSET;
 160         }
 161 }
 162
 163 /****************************************************
 164  Create a new partial auth user struct.
 165 *****************************************************/
 166
 167 int register_initial_vuid(struct smbd_server_connection *sconn)
 168 {
 169         user_struct *vuser;
 170
 171         /* Paranoia check. */
 172         if(lp_security() == SEC_SHARE) {
 173                 smb_panic("register_initial_vuid: "
 174                         "Tried to register uid in security=share");
 175         }
 176
 177         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 178         if (sconn->smb1.sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 179                 return UID_FIELD_INVALID;
 180         }
 181
 182         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 183                 DEBUG(0,("register_initial_vuid: "
 184                                 "Failed to talloc users struct!\n"));
 185                 return UID_FIELD_INVALID;
 186         }
 187
 188         /* Allocate a free vuid. Yes this is a linear search... */
 189         while( get_valid_user_struct_internal(sconn,
 190                         sconn->smb1.sessions.next_vuid,
 191                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 192                 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 193         }
 194
 195         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 196                 (unsigned int)sconn->smb1.sessions.next_vuid ));
 197
 198         vuser->vuid = sconn->smb1.sessions.next_vuid;
 199
 200         /*
 201          * This happens in an unfinished NTLMSSP session setup. We
 202          * need to allocate a vuid between the first and second calls
 203          * to NTLMSSP.
 204          */
 205         increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 206         sconn->smb1.sessions.num_validated_vuids++;
 207
 208         DLIST_ADD(sconn->smb1.sessions.validated_users, vuser);
 209         return vuser->vuid;
 210 }
 211
 212 int register_homes_share(const char *username)
 213 {
 214         int result;
 215         struct passwd *pwd;
 216
 217         result = lp_servicenumber(username);
 218         if (result != -1) {
 219                 DEBUG(3, ("Using static (or previously created) service for "
 220                           "user '%s'; path = '%s'\n", username,
 221                           lp_pathname(result)));
 222                 return result;
 223         }
 224
 225         pwd = Get_Pwnam_alloc(talloc_tos(), username);
 226
 227         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 228                 DEBUG(3, ("No home directory defined for user '%s'\n",
 229                           username));
 230                 TALLOC_FREE(pwd);
 231                 return -1;
 232         }
 233
 234         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 235                   "'%s'\n", username, pwd->pw_dir));
 236
 237         result = add_home_service(username, username, pwd->pw_dir);
 238
 239         TALLOC_FREE(pwd);
 240         return result;
 241 }
 242
 243 /**
 244  *  register that a valid login has been performed, establish 'session'.
 245  *  @param server_info The token returned from the authentication process.
 246  *   (now 'owned' by register_existing_vuid)
 247  *
 248  *  @param session_key The User session key for the login session (now also
 249  *  'owned' by register_existing_vuid)
 250  *
 251  *  @param respose_blob The NT challenge-response, if available.  (May be
 252  *  freed after this call)
 253  *
 254  *  @param smb_name The untranslated name of the user
 255  *
 256  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 257  *   tell random client vuid's (normally zero) from valid vuids.)
 258  *
 259  */
 260
 261 int register_existing_vuid(struct smbd_server_connection *sconn,
 262                         uint16 vuid,
 263                         struct auth_serversupplied_info *server_info,
 264                         DATA_BLOB response_blob,
 265                         const char *smb_name)
 266 {
 267         fstring tmp;
 268         user_struct *vuser;
 269
 270         vuser = get_partial_auth_user_struct(sconn, vuid);
 271         if (!vuser) {
 272                 goto fail;
 273         }
 274
 275         /* Use this to keep tabs on all our info from the authentication */
 276         vuser->server_info = talloc_move(vuser, &server_info);
 277
 278         /* This is a potentially untrusted username */
 279         alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
 280
 281         vuser->server_info->sanitized_username = talloc_strdup(
 282                 vuser->server_info, tmp);
 283
 284         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 285                   (unsigned int)vuser->server_info->utok.uid,
 286                   (unsigned int)vuser->server_info->utok.gid,
 287                   vuser->server_info->unix_name,
 288                   vuser->server_info->sanitized_username,
 289                   vuser->server_info->info3->base.domain.string,
 290                   vuser->server_info->guest ));
 291
 292         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 293                   "Real name: %s\n", vuser->server_info->unix_name,
 294                   vuser->server_info->info3->base.full_name.string));
 295
 296         if (!vuser->server_info->ptok) {
 297                 DEBUG(1, ("register_existing_vuid: server_info does not "
 298                         "contain a user_token - cannot continue\n"));
 299                 goto fail;
 300         }
 301
 302         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 303                 "and will be vuid %u\n", (int)vuser->server_info->utok.uid,
 304                  vuser->server_info->unix_name, vuser->vuid));
 305
 306         if (!session_claim(sconn, vuser)) {
 307                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 308                         "for vuid=%d\n",
 309                         vuser->vuid));
 310                 goto fail;
 311         }
 312
 313         /* Register a home dir service for this user if
 314         (a) This is not a guest connection,
 315         (b) we have a home directory defined
 316         (c) there s not an existing static share by that name
 317         If a share exists by this name (autoloaded or not) reuse it . */
 318
 319         vuser->homes_snum = -1;
 320
 321         if (!vuser->server_info->guest) {
 322                 vuser->homes_snum = register_homes_share(
 323                         vuser->server_info->unix_name);
 324         }
 325
 326         if (srv_is_signing_negotiated(sconn) &&
 327             !vuser->server_info->guest) {
 328                 /* Try and turn on server signing on the first non-guest
 329                  * sessionsetup. */
 330                 srv_set_signing(sconn,
 331                                 vuser->server_info->user_session_key,
 332                                 response_blob);
 333         }
 334
 335         /* fill in the current_user_info struct */
 336         set_current_user_info(
 337                 vuser->server_info->sanitized_username,
 338                 vuser->server_info->unix_name,
 339                 vuser->server_info->info3->base.domain.string);
 340
 341         return vuser->vuid;
 342
 343   fail:
 344
 345         if (vuser) {
 346                 invalidate_vuid(sconn, vuid);
 347         }
 348         return UID_FIELD_INVALID;
 349 }
 350
 351 /****************************************************************************
 352  Add a name to the session users list.
 353 ****************************************************************************/
 354
 355 void add_session_user(struct smbd_server_connection *sconn,
 356                       const char *user)
 357 {
 358         struct passwd *pw;
 359         char *tmp;
 360
 361         pw = Get_Pwnam_alloc(talloc_tos(), user);
 362
 363         if (pw == NULL) {
 364                 return;
 365         }
 366
 367         if (sconn->smb1.sessions.session_userlist == NULL) {
 368                 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
 369                 goto done;
 370         }
 371
 372         if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
 373                 goto done;
 374         }
 375
 376         if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
 377                 DEBUG(3,("add_session_user: session userlist already "
 378                          "too large.\n"));
 379                 goto done;
 380         }
 381
 382         if (asprintf(&tmp, "%s %s",
 383                      sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
 384                 DEBUG(3, ("asprintf failed\n"));
 385                 goto done;
 386         }
 387
 388         SAFE_FREE(sconn->smb1.sessions.session_userlist);
 389         sconn->smb1.sessions.session_userlist = tmp;
 390  done:
 391         TALLOC_FREE(pw);
 392 }
 393
 394 /****************************************************************************
 395  In security=share mode we need to store the client workgroup, as that's
 396   what Vista uses for the NTLMv2 calculation.
 397 ****************************************************************************/
 398
 399 void add_session_workgroup(struct smbd_server_connection *sconn,
 400                            const char *workgroup)
 401 {
 402         if (sconn->smb1.sessions.session_workgroup) {
 403                 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
 404         }
 405         sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
 406 }
 407
 408 /****************************************************************************
 409  In security=share mode we need to return the client workgroup, as that's
 410   what Vista uses for the NTLMv2 calculation.
 411 ****************************************************************************/
 412
 413 const char *get_session_workgroup(struct smbd_server_connection *sconn)
 414 {
 415         return sconn->smb1.sessions.session_workgroup;
 416 }
 417
 418 /****************************************************************************
 419  Check if a username is valid.
 420 ****************************************************************************/
 421
 422 static bool user_ok(const char *user, int snum)
 423 {
 424         bool ret;
 425
 426         ret = True;
 427
 428         if (lp_invalid_users(snum)) {
 429                 char **invalid = str_list_copy(talloc_tos(),
 430                         lp_invalid_users(snum));
 431                 if (invalid &&
 432                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 433
 434                         /* This is used in sec=share only, so no current user
 435                          * around to pass to str_list_sub_basic() */
 436
 437                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 438                                 ret = !user_in_list(talloc_tos(), user,
 439                                                     (const char **)invalid);
 440                         }
 441                 }
 442                 TALLOC_FREE(invalid);
 443         }
 444
 445         if (ret && lp_valid_users(snum)) {
 446                 char **valid = str_list_copy(talloc_tos(),
 447                         lp_valid_users(snum));
 448                 if ( valid &&
 449                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 450
 451                         /* This is used in sec=share only, so no current user
 452                          * around to pass to str_list_sub_basic() */
 453
 454                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 455                                 ret = user_in_list(talloc_tos(), user,
 456                                                    (const char **)valid);
 457                         }
 458                 }
 459                 TALLOC_FREE(valid);
 460         }
 461
 462         if (ret && lp_onlyuser(snum)) {
 463                 char **user_list = str_list_make_v3(
 464                         talloc_tos(), lp_username(snum), NULL);
 465                 if (user_list &&
 466                     str_list_substitute(user_list, "%S",
 467                                         lp_servicename(snum))) {
 468                         ret = user_in_list(talloc_tos(), user,
 469                                            (const char **)user_list);
 470                 }
 471                 TALLOC_FREE(user_list);
 472         }
 473
 474         return(ret);
 475 }
 476
 477 /****************************************************************************
 478  Validate a group username entry. Return the username or NULL.
 479 ****************************************************************************/
 480
 481 static char *validate_group(struct smbd_server_connection *sconn,
 482                             char *group, DATA_BLOB password,int snum)
 483 {
 484 #ifdef HAVE_NETGROUP
 485         {
 486                 char *host, *user, *domain;
 487                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 488                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 489                 setnetgrent(group);
 490                 while (getnetgrent(&host, &user, &domain)) {
 491                         if (user) {
 492                                 if (user_ok(user, snum) &&
 493                                     password_ok(actx, enc,
 494                                                 get_session_workgroup(sconn),
 495                                                 user,password)) {
 496                                         endnetgrent();
 497                                         return(user);
 498                                 }
 499                         }
 500                 }
 501                 endnetgrent();
 502         }
 503 #endif
 504
 505 #ifdef HAVE_GETGRENT
 506         {
 507                 struct group *gptr;
 508                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 509                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 510
 511                 setgrent();
 512                 while ((gptr = (struct group *)getgrent())) {
 513                         if (strequal(gptr->gr_name,group))
 514                                 break;
 515                 }
 516
 517                 /*
 518                  * As user_ok can recurse doing a getgrent(), we must
 519                  * copy the member list onto the heap before
 520                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 521                  */
 522
 523                 if (gptr) {
 524                         char *member_list = NULL;
 525                         size_t list_len = 0;
 526                         char *member;
 527                         int i;
 528
 529                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 530                                 list_len += strlen(gptr->gr_mem[i])+1;
 531                         }
 532                         list_len++;
 533
 534                         member_list = (char *)SMB_MALLOC(list_len);
 535                         if (!member_list) {
 536                                 endgrent();
 537                                 return NULL;
 538                         }
 539
 540                         *member_list = '\0';
 541                         member = member_list;
 542
 543                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 544                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 545
 546                                 DEBUG(10,("validate_group: = gr_mem = "
 547                                           "%s\n", gptr->gr_mem[i]));
 548
 549                                 safe_strcpy(member, gptr->gr_mem[i],
 550                                         list_len - (member-member_list));
 551                                 member += member_len;
 552                         }
 553
 554                         endgrent();
 555
 556                         member = member_list;
 557                         while (*member) {
 558                                 if (user_ok(member,snum) &&
 559                                     password_ok(actx, enc,
 560                                                 get_session_workgroup(sconn),
 561                                                 member,password)) {
 562                                         char *name = talloc_strdup(talloc_tos(),
 563                                                                 member);
 564                                         SAFE_FREE(member_list);
 565                                         return name;
 566                                 }
 567
 568                                 DEBUG(10,("validate_group = member = %s\n",
 569                                           member));
 570
 571                                 member += strlen(member) + 1;
 572                         }
 573
 574                         SAFE_FREE(member_list);
 575                 } else {
 576                         endgrent();
 577                         return NULL;
 578                 }
 579         }
 580 #endif
 581         return(NULL);
 582 }
 583
 584 /****************************************************************************
 585  Check for authority to login to a service with a given username/password.
 586  Note this is *NOT* used when logging on using sessionsetup_and_X.
 587 ****************************************************************************/
 588
 589 bool authorise_login(struct smbd_server_connection *sconn,
 590                      int snum, fstring user, DATA_BLOB password,
 591                      bool *guest)
 592 {
 593         bool ok = False;
 594         struct auth_context *actx = sconn->smb1.negprot.auth_context;
 595         bool enc = sconn->smb1.negprot.encrypted_passwords;
 596
 597 #ifdef DEBUG_PASSWORD
 598         DEBUG(100,("authorise_login: checking authorisation on "
 599                    "user=%s pass=%s\n", user,password.data));
 600 #endif
 601
 602         *guest = False;
 603
 604         /* there are several possibilities:
 605                 1) login as the given user with given password
 606                 2) login as a previously registered username with the given
 607                    password
 608                 3) login as a session list username with the given password
 609                 4) login as a previously validated user/password pair
 610                 5) login as the "user =" user with given password
 611                 6) login as the "user =" user with no password
 612                    (guest connection)
 613                 7) login as guest user with no password
 614
 615                 if the service is guest_only then steps 1 to 5 are skipped
 616         */
 617
 618         /* now check the list of session users */
 619         if (!ok) {
 620                 char *auser;
 621                 char *user_list = NULL;
 622                 char *saveptr;
 623
 624                 if (sconn->smb1.sessions.session_userlist)
 625                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
 626                 else
 627                         user_list = SMB_STRDUP("");
 628
 629                 if (!user_list)
 630                         return(False);
 631
 632                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 633                      !ok && auser;
 634                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 635                         fstring user2;
 636                         fstrcpy(user2,auser);
 637                         if (!user_ok(user2,snum))
 638                                 continue;
 639
 640                         if (password_ok(actx, enc,
 641                                         get_session_workgroup(sconn),
 642                                         user2,password)) {
 643                                 ok = True;
 644                                 fstrcpy(user,user2);
 645                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 646                                          "list username (%s) and given "
 647                                          "password ok\n", user));
 648                         }
 649                 }
 650
 651                 SAFE_FREE(user_list);
 652         }
 653
 654         /* check the user= fields and the given password */
 655         if (!ok && lp_username(snum)) {
 656                 TALLOC_CTX *ctx = talloc_tos();
 657                 char *auser;
 658                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 659                 char *saveptr;
 660
 661                 if (!user_list) {
 662                         goto check_guest;
 663                 }
 664
 665                 user_list = talloc_string_sub(ctx,
 666                                 user_list,
 667                                 "%S",
 668                                 lp_servicename(snum));
 669
 670                 if (!user_list) {
 671                         goto check_guest;
 672                 }
 673
 674                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 675                      auser && !ok;
 676                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 677                         if (*auser == '@') {
 678                                 auser = validate_group(sconn,auser+1,
 679                                                        password,snum);
 680                                 if (auser) {
 681                                         ok = True;
 682                                         fstrcpy(user,auser);
 683                                         DEBUG(3,("authorise_login: ACCEPTED: "
 684                                                  "group username and given "
 685                                                  "password ok (%s)\n", user));
 686                                 }
 687                         } else {
 688                                 fstring user2;
 689                                 fstrcpy(user2,auser);
 690                                 if (user_ok(user2,snum) &&
 691                                     password_ok(actx, enc,
 692                                                 get_session_workgroup(sconn),
 693                                                 user2,password)) {
 694                                         ok = True;
 695                                         fstrcpy(user,user2);
 696                                         DEBUG(3,("authorise_login: ACCEPTED: "
 697                                                  "user list username and "
 698                                                  "given password ok (%s)\n",
 699                                                  user));
 700                                 }
 701                         }
 702                 }
 703         }
 704
 705   check_guest:
 706
 707         /* check for a normal guest connection */
 708         if (!ok && GUEST_OK(snum)) {
 709                 struct passwd *guest_pw;
 710                 fstring guestname;
 711                 fstrcpy(guestname,lp_guestaccount());
 712                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 713                 if (guest_pw != NULL) {
 714                         fstrcpy(user,guestname);
 715                         ok = True;
 716                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 717                                  "and guest ok (%s)\n", user));
 718                 } else {
 719                         DEBUG(0,("authorise_login: Invalid guest account "
 720                                  "%s??\n",guestname));
 721                 }
 722                 TALLOC_FREE(guest_pw);
 723                 *guest = True;
 724         }
 725
 726         if (ok && !user_ok(user, snum)) {
 727                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 728                 ok = False;
 729         }
 730
 731         return(ok);
 732 }