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 "system/passwd.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../librpc/gen_ndr/netlogon.h"
  26 #include "auth.h"
  27
  28 /* Fix up prototypes for OSX 10.4, where they're missing */
  29 #ifndef HAVE_SETNETGRENT_PROTOTYPE
  30 extern int setnetgrent(const char* netgroup);
  31 #endif
  32 #ifndef HAVE_GETNETGRENT_PROTOTYPE
  33 extern int getnetgrent(char **host, char **user, char **domain);
  34 #endif
  35 #ifndef HAVE_ENDNETGRENT_PROTOTYPE
  36 extern void endnetgrent(void);
  37 #endif
  38
  39 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  40                                 SERVER_ALLOCATED_REQUIRED_NO,
  41                                 SERVER_ALLOCATED_REQUIRED_ANY};
  42
  43 static user_struct *get_valid_user_struct_internal(
  44                         struct smbd_server_connection *sconn,
  45                         uint16 vuid,
  46                         enum server_allocated_state server_allocated)
  47 {
  48         user_struct *usp;
  49         int count=0;
  50
  51         if (vuid == UID_FIELD_INVALID)
  52                 return NULL;
  53
  54         usp=sconn->smb1.sessions.validated_users;
  55         for (;usp;usp=usp->next,count++) {
  56                 if (vuid == usp->vuid) {
  57                         switch (server_allocated) {
  58                                 case SERVER_ALLOCATED_REQUIRED_YES:
  59                                         if (usp->session_info == NULL) {
  60                                                 continue;
  61                                         }
  62                                         break;
  63                                 case SERVER_ALLOCATED_REQUIRED_NO:
  64                                         if (usp->session_info != NULL) {
  65                                                 continue;
  66                                         }
  67                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  68                                         break;
  69                         }
  70                         if (count > 10) {
  71                                 DLIST_PROMOTE(sconn->smb1.sessions.validated_users,
  72                                               usp);
  73                         }
  74                         return usp;
  75                 }
  76         }
  77
  78         return NULL;
  79 }
  80
  81 /****************************************************************************
  82  Check if a uid has been validated, and return an pointer to the user_struct
  83  if it has. NULL if not. vuid is biased by an offset. This allows us to
  84  tell random client vuid's (normally zero) from valid vuids.
  85 ****************************************************************************/
  86
  87 user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
  88                                    uint16 vuid)
  89 {
  90         return get_valid_user_struct_internal(sconn, vuid,
  91                         SERVER_ALLOCATED_REQUIRED_YES);
  92 }
  93
  94 bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
  95 {
  96         return (get_partial_auth_user_struct(sconn, vuid) != NULL);
  97 }
  98
  99 /****************************************************************************
 100  Get the user struct of a partial NTLMSSP login
 101 ****************************************************************************/
 102
 103 user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
 104                                           uint16 vuid)
 105 {
 106         return get_valid_user_struct_internal(sconn, vuid,
 107                         SERVER_ALLOCATED_REQUIRED_NO);
 108 }
 109
 110 /****************************************************************************
 111  Invalidate a uid.
 112 ****************************************************************************/
 113
 114 void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
 115 {
 116         user_struct *vuser = NULL;
 117
 118         vuser = get_valid_user_struct_internal(sconn, vuid,
 119                         SERVER_ALLOCATED_REQUIRED_ANY);
 120         if (vuser == NULL) {
 121                 return;
 122         }
 123
 124         session_yield(vuser);
 125
 126         if (vuser->auth_ntlmssp_state) {
 127                 TALLOC_FREE(vuser->auth_ntlmssp_state);
 128         }
 129
 130         DLIST_REMOVE(sconn->smb1.sessions.validated_users, vuser);
 131
 132         /* clear the vuid from the 'cache' on each connection, and
 133            from the vuid 'owner' of connections */
 134         conn_clear_vuid_caches(sconn, vuid);
 135
 136         TALLOC_FREE(vuser);
 137         sconn->smb1.sessions.num_validated_vuids--;
 138 }
 139
 140 /****************************************************************************
 141  Invalidate all vuid entries for this process.
 142 ****************************************************************************/
 143
 144 void invalidate_all_vuids(struct smbd_server_connection *sconn)
 145 {
 146         if (sconn->using_smb2) {
 147                 return;
 148         }
 149
 150         while (sconn->smb1.sessions.validated_users != NULL) {
 151                 invalidate_vuid(sconn,
 152                                 sconn->smb1.sessions.validated_users->vuid);
 153         }
 154 }
 155
 156 static void increment_next_vuid(uint16_t *vuid)
 157 {
 158         *vuid += 1;
 159
 160         /* Check for vuid wrap. */
 161         if (*vuid == UID_FIELD_INVALID) {
 162                 *vuid = VUID_OFFSET;
 163         }
 164 }
 165
 166 /****************************************************
 167  Create a new partial auth user struct.
 168 *****************************************************/
 169
 170 int register_initial_vuid(struct smbd_server_connection *sconn)
 171 {
 172         user_struct *vuser;
 173
 174         /* Paranoia check. */
 175         if(lp_security() == SEC_SHARE) {
 176                 smb_panic("register_initial_vuid: "
 177                         "Tried to register uid in security=share");
 178         }
 179
 180         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 181         if (sconn->smb1.sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 182                 return UID_FIELD_INVALID;
 183         }
 184
 185         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 186                 DEBUG(0,("register_initial_vuid: "
 187                                 "Failed to talloc users struct!\n"));
 188                 return UID_FIELD_INVALID;
 189         }
 190
 191         /* Allocate a free vuid. Yes this is a linear search... */
 192         while( get_valid_user_struct_internal(sconn,
 193                         sconn->smb1.sessions.next_vuid,
 194                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 195                 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 196         }
 197
 198         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 199                 (unsigned int)sconn->smb1.sessions.next_vuid ));
 200
 201         vuser->vuid = sconn->smb1.sessions.next_vuid;
 202
 203         /*
 204          * This happens in an unfinished NTLMSSP session setup. We
 205          * need to allocate a vuid between the first and second calls
 206          * to NTLMSSP.
 207          */
 208         increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 209         sconn->smb1.sessions.num_validated_vuids++;
 210
 211         DLIST_ADD(sconn->smb1.sessions.validated_users, vuser);
 212         return vuser->vuid;
 213 }
 214
 215 int register_homes_share(const char *username)
 216 {
 217         int result;
 218         struct passwd *pwd;
 219
 220         result = lp_servicenumber(username);
 221         if (result != -1) {
 222                 DEBUG(3, ("Using static (or previously created) service for "
 223                           "user '%s'; path = '%s'\n", username,
 224                           lp_pathname(result)));
 225                 return result;
 226         }
 227
 228         pwd = Get_Pwnam_alloc(talloc_tos(), username);
 229
 230         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 231                 DEBUG(3, ("No home directory defined for user '%s'\n",
 232                           username));
 233                 TALLOC_FREE(pwd);
 234                 return -1;
 235         }
 236
 237         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 238                   "'%s'\n", username, pwd->pw_dir));
 239
 240         result = add_home_service(username, username, pwd->pw_dir);
 241
 242         TALLOC_FREE(pwd);
 243         return result;
 244 }
 245
 246 /**
 247  *  register that a valid login has been performed, establish 'session'.
 248  *  @param session_info The token returned from the authentication process.
 249  *   (now 'owned' by register_existing_vuid)
 250  *
 251  *  @param session_key The User session key for the login session (now also
 252  *  'owned' by register_existing_vuid)
 253  *
 254  *  @param respose_blob The NT challenge-response, if available.  (May be
 255  *  freed after this call)
 256  *
 257  *  @param smb_name The untranslated name of the user
 258  *
 259  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 260  *   tell random client vuid's (normally zero) from valid vuids.)
 261  *
 262  */
 263
 264 int register_existing_vuid(struct smbd_server_connection *sconn,
 265                         uint16 vuid,
 266                         struct auth3_session_info *session_info,
 267                         DATA_BLOB response_blob,
 268                         const char *smb_name)
 269 {
 270         fstring tmp;
 271         user_struct *vuser;
 272
 273         vuser = get_partial_auth_user_struct(sconn, vuid);
 274         if (!vuser) {
 275                 goto fail;
 276         }
 277
 278         /* Use this to keep tabs on all our info from the authentication */
 279         vuser->session_info = talloc_move(vuser, &session_info);
 280
 281         /* This is a potentially untrusted username */
 282         alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
 283
 284         vuser->session_info->unix_info->sanitized_username = talloc_strdup(
 285                 vuser->session_info, tmp);
 286
 287         /* Make clear that we require the optional unix_token and unix_info in the source3 code */
 288         SMB_ASSERT(vuser->session_info->unix_token);
 289         SMB_ASSERT(vuser->session_info->unix_info);
 290
 291         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 292                   (unsigned int)vuser->session_info->unix_token->uid,
 293                   (unsigned int)vuser->session_info->unix_token->gid,
 294                   vuser->session_info->unix_info->unix_name,
 295                   vuser->session_info->unix_info->sanitized_username,
 296                   vuser->session_info->info->domain_name,
 297                   vuser->session_info->unix_info->guest ));
 298
 299         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 300                   "Real name: %s\n", vuser->session_info->unix_info->unix_name,
 301                   vuser->session_info->info->full_name));
 302
 303         if (!vuser->session_info->security_token) {
 304                 DEBUG(1, ("register_existing_vuid: session_info does not "
 305                         "contain a user_token - cannot continue\n"));
 306                 goto fail;
 307         }
 308
 309         /* Make clear that we require the optional unix_token in the source3 code */
 310         SMB_ASSERT(vuser->session_info->unix_token);
 311
 312         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 313                 "and will be vuid %u\n", (int)vuser->session_info->unix_token->uid,
 314                  vuser->session_info->unix_info->unix_name, vuser->vuid));
 315
 316         if (!session_claim(sconn, vuser)) {
 317                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 318                         "for vuid=%d\n",
 319                         vuser->vuid));
 320                 goto fail;
 321         }
 322
 323         /* Register a home dir service for this user if
 324         (a) This is not a guest connection,
 325         (b) we have a home directory defined
 326         (c) there s not an existing static share by that name
 327         If a share exists by this name (autoloaded or not) reuse it . */
 328
 329         vuser->homes_snum = -1;
 330
 331         if (!vuser->session_info->unix_info->guest) {
 332                 vuser->homes_snum = register_homes_share(
 333                         vuser->session_info->unix_info->unix_name);
 334         }
 335
 336         if (srv_is_signing_negotiated(sconn) &&
 337             !vuser->session_info->unix_info->guest) {
 338                 /* Try and turn on server signing on the first non-guest
 339                  * sessionsetup. */
 340                 srv_set_signing(sconn,
 341                                 vuser->session_info->session_key,
 342                                 response_blob);
 343         }
 344
 345         /* fill in the current_user_info struct */
 346         set_current_user_info(
 347                 vuser->session_info->unix_info->sanitized_username,
 348                 vuser->session_info->unix_info->unix_name,
 349                 vuser->session_info->info->domain_name);
 350
 351         return vuser->vuid;
 352
 353   fail:
 354
 355         if (vuser) {
 356                 invalidate_vuid(sconn, vuid);
 357         }
 358         return UID_FIELD_INVALID;
 359 }
 360
 361 /****************************************************************************
 362  Add a name to the session users list.
 363 ****************************************************************************/
 364
 365 void add_session_user(struct smbd_server_connection *sconn,
 366                       const char *user)
 367 {
 368         struct passwd *pw;
 369         char *tmp;
 370
 371         pw = Get_Pwnam_alloc(talloc_tos(), user);
 372
 373         if (pw == NULL) {
 374                 return;
 375         }
 376
 377         if (sconn->smb1.sessions.session_userlist == NULL) {
 378                 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
 379                 goto done;
 380         }
 381
 382         if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
 383                 goto done;
 384         }
 385
 386         if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
 387                 DEBUG(3,("add_session_user: session userlist already "
 388                          "too large.\n"));
 389                 goto done;
 390         }
 391
 392         if (asprintf(&tmp, "%s %s",
 393                      sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
 394                 DEBUG(3, ("asprintf failed\n"));
 395                 goto done;
 396         }
 397
 398         SAFE_FREE(sconn->smb1.sessions.session_userlist);
 399         sconn->smb1.sessions.session_userlist = tmp;
 400  done:
 401         TALLOC_FREE(pw);
 402 }
 403
 404 /****************************************************************************
 405  In security=share mode we need to store the client workgroup, as that's
 406   what Vista uses for the NTLMv2 calculation.
 407 ****************************************************************************/
 408
 409 void add_session_workgroup(struct smbd_server_connection *sconn,
 410                            const char *workgroup)
 411 {
 412         if (sconn->smb1.sessions.session_workgroup) {
 413                 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
 414         }
 415         sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
 416 }
 417
 418 /****************************************************************************
 419  In security=share mode we need to return the client workgroup, as that's
 420   what Vista uses for the NTLMv2 calculation.
 421 ****************************************************************************/
 422
 423 const char *get_session_workgroup(struct smbd_server_connection *sconn)
 424 {
 425         return sconn->smb1.sessions.session_workgroup;
 426 }
 427
 428 /****************************************************************************
 429  Check if a username is valid.
 430 ****************************************************************************/
 431
 432 static bool user_ok(const char *user, int snum)
 433 {
 434         bool ret;
 435
 436         ret = True;
 437
 438         if (lp_invalid_users(snum)) {
 439                 char **invalid = str_list_copy(talloc_tos(),
 440                         lp_invalid_users(snum));
 441                 if (invalid &&
 442                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 443
 444                         /* This is used in sec=share only, so no current user
 445                          * around to pass to str_list_sub_basic() */
 446
 447                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 448                                 ret = !user_in_list(talloc_tos(), user,
 449                                                     (const char **)invalid);
 450                         }
 451                 }
 452                 TALLOC_FREE(invalid);
 453         }
 454
 455         if (ret && lp_valid_users(snum)) {
 456                 char **valid = str_list_copy(talloc_tos(),
 457                         lp_valid_users(snum));
 458                 if ( valid &&
 459                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 460
 461                         /* This is used in sec=share only, so no current user
 462                          * around to pass to str_list_sub_basic() */
 463
 464                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 465                                 ret = user_in_list(talloc_tos(), user,
 466                                                    (const char **)valid);
 467                         }
 468                 }
 469                 TALLOC_FREE(valid);
 470         }
 471
 472         if (ret && lp_onlyuser(snum)) {
 473                 char **user_list = str_list_make_v3(
 474                         talloc_tos(), lp_username(snum), NULL);
 475                 if (user_list &&
 476                     str_list_substitute(user_list, "%S",
 477                                         lp_servicename(snum))) {
 478                         ret = user_in_list(talloc_tos(), user,
 479                                            (const char **)user_list);
 480                 }
 481                 TALLOC_FREE(user_list);
 482         }
 483
 484         return(ret);
 485 }
 486
 487 /****************************************************************************
 488  Validate a group username entry. Return the username or NULL.
 489 ****************************************************************************/
 490
 491 static char *validate_group(struct smbd_server_connection *sconn,
 492                             char *group, DATA_BLOB password,int snum)
 493 {
 494 #ifdef HAVE_NETGROUP
 495         {
 496                 char *host, *user, *domain;
 497                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 498                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 499                 setnetgrent(group);
 500                 while (getnetgrent(&host, &user, &domain)) {
 501                         if (user) {
 502                                 if (user_ok(user, snum) &&
 503                                     password_ok(actx, enc,
 504                                                 get_session_workgroup(sconn),
 505                                                 user,
 506                                                 sconn->remote_address,
 507                                                 password)) {
 508                                         endnetgrent();
 509                                         return(user);
 510                                 }
 511                         }
 512                 }
 513                 endnetgrent();
 514         }
 515 #endif
 516
 517 #ifdef HAVE_GETGRENT
 518         {
 519                 struct group *gptr;
 520                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 521                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 522
 523                 setgrent();
 524                 while ((gptr = (struct group *)getgrent())) {
 525                         if (strequal(gptr->gr_name,group))
 526                                 break;
 527                 }
 528
 529                 /*
 530                  * As user_ok can recurse doing a getgrent(), we must
 531                  * copy the member list onto the heap before
 532                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 533                  */
 534
 535                 if (gptr) {
 536                         char *member_list = NULL;
 537                         size_t list_len = 0;
 538                         char *member;
 539                         int i;
 540
 541                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 542                                 list_len += strlen(gptr->gr_mem[i])+1;
 543                         }
 544                         list_len++;
 545
 546                         member_list = (char *)SMB_MALLOC(list_len);
 547                         if (!member_list) {
 548                                 endgrent();
 549                                 return NULL;
 550                         }
 551
 552                         *member_list = '\0';
 553                         member = member_list;
 554
 555                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 556                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 557
 558                                 DEBUG(10,("validate_group: = gr_mem = "
 559                                           "%s\n", gptr->gr_mem[i]));
 560
 561                                 strlcpy(member, gptr->gr_mem[i],
 562                                         list_len - (member-member_list));
 563                                 member += member_len;
 564                         }
 565
 566                         endgrent();
 567
 568                         member = member_list;
 569                         while (*member) {
 570                                 if (user_ok(member,snum) &&
 571                                     password_ok(actx, enc,
 572                                                 get_session_workgroup(sconn),
 573                                                 member,
 574                                                 sconn->remote_address,
 575                                                 password)) {
 576                                         char *name = talloc_strdup(talloc_tos(),
 577                                                                 member);
 578                                         SAFE_FREE(member_list);
 579                                         return name;
 580                                 }
 581
 582                                 DEBUG(10,("validate_group = member = %s\n",
 583                                           member));
 584
 585                                 member += strlen(member) + 1;
 586                         }
 587
 588                         SAFE_FREE(member_list);
 589                 } else {
 590                         endgrent();
 591                         return NULL;
 592                 }
 593         }
 594 #endif
 595         return(NULL);
 596 }
 597
 598 /****************************************************************************
 599  Check for authority to login to a service with a given username/password.
 600  Note this is *NOT* used when logging on using sessionsetup_and_X.
 601 ****************************************************************************/
 602
 603 bool authorise_login(struct smbd_server_connection *sconn,
 604                      int snum, fstring user, DATA_BLOB password,
 605                      bool *guest)
 606 {
 607         bool ok = False;
 608         struct auth_context *actx = sconn->smb1.negprot.auth_context;
 609         bool enc = sconn->smb1.negprot.encrypted_passwords;
 610
 611 #ifdef DEBUG_PASSWORD
 612         DEBUG(100,("authorise_login: checking authorisation on "
 613                    "user=%s pass=%s\n", user,password.data));
 614 #endif
 615
 616         *guest = False;
 617
 618         /* there are several possibilities:
 619                 1) login as the given user with given password
 620                 2) login as a previously registered username with the given
 621                    password
 622                 3) login as a session list username with the given password
 623                 4) login as a previously validated user/password pair
 624                 5) login as the "user =" user with given password
 625                 6) login as the "user =" user with no password
 626                    (guest connection)
 627                 7) login as guest user with no password
 628
 629                 if the service is guest_only then steps 1 to 5 are skipped
 630         */
 631
 632         /* now check the list of session users */
 633         if (!ok) {
 634                 char *auser;
 635                 char *user_list = NULL;
 636                 char *saveptr;
 637
 638                 if (sconn->smb1.sessions.session_userlist)
 639                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
 640                 else
 641                         user_list = SMB_STRDUP("");
 642
 643                 if (!user_list)
 644                         return(False);
 645
 646                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 647                      !ok && auser;
 648                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 649                         fstring user2;
 650                         fstrcpy(user2,auser);
 651                         if (!user_ok(user2,snum))
 652                                 continue;
 653
 654                         if (password_ok(actx, enc,
 655                                         get_session_workgroup(sconn),
 656                                         user2,
 657                                         sconn->remote_address,
 658                                         password)) {
 659                                 ok = True;
 660                                 strlcpy(user,user2,sizeof(fstring));
 661                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 662                                          "list username (%s) and given "
 663                                          "password ok\n", user));
 664                         }
 665                 }
 666
 667                 SAFE_FREE(user_list);
 668         }
 669
 670         /* check the user= fields and the given password */
 671         if (!ok && lp_username(snum)) {
 672                 TALLOC_CTX *ctx = talloc_tos();
 673                 char *auser;
 674                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 675                 char *saveptr;
 676
 677                 if (!user_list) {
 678                         goto check_guest;
 679                 }
 680
 681                 user_list = talloc_string_sub(ctx,
 682                                 user_list,
 683                                 "%S",
 684                                 lp_servicename(snum));
 685
 686                 if (!user_list) {
 687                         goto check_guest;
 688                 }
 689
 690                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 691                      auser && !ok;
 692                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 693                         if (*auser == '@') {
 694                                 auser = validate_group(sconn,auser+1,
 695                                                        password,snum);
 696                                 if (auser) {
 697                                         ok = True;
 698                                         fstrcpy(user,auser);
 699                                         DEBUG(3,("authorise_login: ACCEPTED: "
 700                                                  "group username and given "
 701                                                  "password ok (%s)\n", user));
 702                                 }
 703                         } else {
 704                                 fstring user2;
 705                                 fstrcpy(user2,auser);
 706                                 if (user_ok(user2,snum) &&
 707                                     password_ok(actx, enc,
 708                                                 get_session_workgroup(sconn),
 709                                                 user2,
 710                                                 sconn->remote_address,
 711                                                 password)) {
 712                                         ok = True;
 713                                         strlcpy(user,user2,sizeof(fstring));
 714                                         DEBUG(3,("authorise_login: ACCEPTED: "
 715                                                  "user list username and "
 716                                                  "given password ok (%s)\n",
 717                                                  user));
 718                                 }
 719                         }
 720                 }
 721         }
 722
 723   check_guest:
 724
 725         /* check for a normal guest connection */
 726         if (!ok && GUEST_OK(snum)) {
 727                 struct passwd *guest_pw;
 728                 fstring guestname;
 729                 fstrcpy(guestname,lp_guestaccount());
 730                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 731                 if (guest_pw != NULL) {
 732                         strlcpy(user,guestname,sizeof(fstring));
 733                         ok = True;
 734                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 735                                  "and guest ok (%s)\n", user));
 736                 } else {
 737                         DEBUG(0,("authorise_login: Invalid guest account "
 738                                  "%s??\n",guestname));
 739                 }
 740                 TALLOC_FREE(guest_pw);
 741                 *guest = True;
 742         }
 743
 744         if (ok && !user_ok(user, snum)) {
 745                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 746                 ok = False;
 747         }
 748
 749         return(ok);
 750 }