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->sanitized_username = talloc_strdup(
 285                 vuser->session_info, tmp);
 286
 287         /* Make clear that we require the optional unix_token in the source3 code */
 288         SMB_ASSERT(vuser->session_info->unix_token);
 289
 290         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 291                   (unsigned int)vuser->session_info->unix_token->uid,
 292                   (unsigned int)vuser->session_info->unix_token->gid,
 293                   vuser->session_info->unix_name,
 294                   vuser->session_info->sanitized_username,
 295                   vuser->session_info->info3->base.domain.string,
 296                   vuser->session_info->guest ));
 297
 298         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 299                   "Real name: %s\n", vuser->session_info->unix_name,
 300                   vuser->session_info->info3->base.full_name.string));
 301
 302         if (!vuser->session_info->security_token) {
 303                 DEBUG(1, ("register_existing_vuid: session_info does not "
 304                         "contain a user_token - cannot continue\n"));
 305                 goto fail;
 306         }
 307
 308         /* Make clear that we require the optional unix_token in the source3 code */
 309         SMB_ASSERT(vuser->session_info->unix_token);
 310
 311         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 312                 "and will be vuid %u\n", (int)vuser->session_info->unix_token->uid,
 313                  vuser->session_info->unix_name, vuser->vuid));
 314
 315         if (!session_claim(sconn, vuser)) {
 316                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 317                         "for vuid=%d\n",
 318                         vuser->vuid));
 319                 goto fail;
 320         }
 321
 322         /* Register a home dir service for this user if
 323         (a) This is not a guest connection,
 324         (b) we have a home directory defined
 325         (c) there s not an existing static share by that name
 326         If a share exists by this name (autoloaded or not) reuse it . */
 327
 328         vuser->homes_snum = -1;
 329
 330         if (!vuser->session_info->guest) {
 331                 vuser->homes_snum = register_homes_share(
 332                         vuser->session_info->unix_name);
 333         }
 334
 335         if (srv_is_signing_negotiated(sconn) &&
 336             !vuser->session_info->guest) {
 337                 /* Try and turn on server signing on the first non-guest
 338                  * sessionsetup. */
 339                 srv_set_signing(sconn,
 340                                 vuser->session_info->session_key,
 341                                 response_blob);
 342         }
 343
 344         /* fill in the current_user_info struct */
 345         set_current_user_info(
 346                 vuser->session_info->sanitized_username,
 347                 vuser->session_info->unix_name,
 348                 vuser->session_info->info3->base.domain.string);
 349
 350         return vuser->vuid;
 351
 352   fail:
 353
 354         if (vuser) {
 355                 invalidate_vuid(sconn, vuid);
 356         }
 357         return UID_FIELD_INVALID;
 358 }
 359
 360 /****************************************************************************
 361  Add a name to the session users list.
 362 ****************************************************************************/
 363
 364 void add_session_user(struct smbd_server_connection *sconn,
 365                       const char *user)
 366 {
 367         struct passwd *pw;
 368         char *tmp;
 369
 370         pw = Get_Pwnam_alloc(talloc_tos(), user);
 371
 372         if (pw == NULL) {
 373                 return;
 374         }
 375
 376         if (sconn->smb1.sessions.session_userlist == NULL) {
 377                 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
 378                 goto done;
 379         }
 380
 381         if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
 382                 goto done;
 383         }
 384
 385         if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
 386                 DEBUG(3,("add_session_user: session userlist already "
 387                          "too large.\n"));
 388                 goto done;
 389         }
 390
 391         if (asprintf(&tmp, "%s %s",
 392                      sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
 393                 DEBUG(3, ("asprintf failed\n"));
 394                 goto done;
 395         }
 396
 397         SAFE_FREE(sconn->smb1.sessions.session_userlist);
 398         sconn->smb1.sessions.session_userlist = tmp;
 399  done:
 400         TALLOC_FREE(pw);
 401 }
 402
 403 /****************************************************************************
 404  In security=share mode we need to store the client workgroup, as that's
 405   what Vista uses for the NTLMv2 calculation.
 406 ****************************************************************************/
 407
 408 void add_session_workgroup(struct smbd_server_connection *sconn,
 409                            const char *workgroup)
 410 {
 411         if (sconn->smb1.sessions.session_workgroup) {
 412                 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
 413         }
 414         sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
 415 }
 416
 417 /****************************************************************************
 418  In security=share mode we need to return the client workgroup, as that's
 419   what Vista uses for the NTLMv2 calculation.
 420 ****************************************************************************/
 421
 422 const char *get_session_workgroup(struct smbd_server_connection *sconn)
 423 {
 424         return sconn->smb1.sessions.session_workgroup;
 425 }
 426
 427 /****************************************************************************
 428  Check if a username is valid.
 429 ****************************************************************************/
 430
 431 static bool user_ok(const char *user, int snum)
 432 {
 433         bool ret;
 434
 435         ret = True;
 436
 437         if (lp_invalid_users(snum)) {
 438                 char **invalid = str_list_copy(talloc_tos(),
 439                         lp_invalid_users(snum));
 440                 if (invalid &&
 441                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 442
 443                         /* This is used in sec=share only, so no current user
 444                          * around to pass to str_list_sub_basic() */
 445
 446                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 447                                 ret = !user_in_list(talloc_tos(), user,
 448                                                     (const char **)invalid);
 449                         }
 450                 }
 451                 TALLOC_FREE(invalid);
 452         }
 453
 454         if (ret && lp_valid_users(snum)) {
 455                 char **valid = str_list_copy(talloc_tos(),
 456                         lp_valid_users(snum));
 457                 if ( valid &&
 458                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 459
 460                         /* This is used in sec=share only, so no current user
 461                          * around to pass to str_list_sub_basic() */
 462
 463                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 464                                 ret = user_in_list(talloc_tos(), user,
 465                                                    (const char **)valid);
 466                         }
 467                 }
 468                 TALLOC_FREE(valid);
 469         }
 470
 471         if (ret && lp_onlyuser(snum)) {
 472                 char **user_list = str_list_make_v3(
 473                         talloc_tos(), lp_username(snum), NULL);
 474                 if (user_list &&
 475                     str_list_substitute(user_list, "%S",
 476                                         lp_servicename(snum))) {
 477                         ret = user_in_list(talloc_tos(), user,
 478                                            (const char **)user_list);
 479                 }
 480                 TALLOC_FREE(user_list);
 481         }
 482
 483         return(ret);
 484 }
 485
 486 /****************************************************************************
 487  Validate a group username entry. Return the username or NULL.
 488 ****************************************************************************/
 489
 490 static char *validate_group(struct smbd_server_connection *sconn,
 491                             char *group, DATA_BLOB password,int snum)
 492 {
 493 #ifdef HAVE_NETGROUP
 494         {
 495                 char *host, *user, *domain;
 496                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 497                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 498                 setnetgrent(group);
 499                 while (getnetgrent(&host, &user, &domain)) {
 500                         if (user) {
 501                                 if (user_ok(user, snum) &&
 502                                     password_ok(actx, enc,
 503                                                 get_session_workgroup(sconn),
 504                                                 user,
 505                                                 sconn->remote_address,
 506                                                 password)) {
 507                                         endnetgrent();
 508                                         return(user);
 509                                 }
 510                         }
 511                 }
 512                 endnetgrent();
 513         }
 514 #endif
 515
 516 #ifdef HAVE_GETGRENT
 517         {
 518                 struct group *gptr;
 519                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 520                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 521
 522                 setgrent();
 523                 while ((gptr = (struct group *)getgrent())) {
 524                         if (strequal(gptr->gr_name,group))
 525                                 break;
 526                 }
 527
 528                 /*
 529                  * As user_ok can recurse doing a getgrent(), we must
 530                  * copy the member list onto the heap before
 531                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 532                  */
 533
 534                 if (gptr) {
 535                         char *member_list = NULL;
 536                         size_t list_len = 0;
 537                         char *member;
 538                         int i;
 539
 540                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 541                                 list_len += strlen(gptr->gr_mem[i])+1;
 542                         }
 543                         list_len++;
 544
 545                         member_list = (char *)SMB_MALLOC(list_len);
 546                         if (!member_list) {
 547                                 endgrent();
 548                                 return NULL;
 549                         }
 550
 551                         *member_list = '\0';
 552                         member = member_list;
 553
 554                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 555                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 556
 557                                 DEBUG(10,("validate_group: = gr_mem = "
 558                                           "%s\n", gptr->gr_mem[i]));
 559
 560                                 strlcpy(member, gptr->gr_mem[i],
 561                                         list_len - (member-member_list));
 562                                 member += member_len;
 563                         }
 564
 565                         endgrent();
 566
 567                         member = member_list;
 568                         while (*member) {
 569                                 if (user_ok(member,snum) &&
 570                                     password_ok(actx, enc,
 571                                                 get_session_workgroup(sconn),
 572                                                 member,
 573                                                 sconn->remote_address,
 574                                                 password)) {
 575                                         char *name = talloc_strdup(talloc_tos(),
 576                                                                 member);
 577                                         SAFE_FREE(member_list);
 578                                         return name;
 579                                 }
 580
 581                                 DEBUG(10,("validate_group = member = %s\n",
 582                                           member));
 583
 584                                 member += strlen(member) + 1;
 585                         }
 586
 587                         SAFE_FREE(member_list);
 588                 } else {
 589                         endgrent();
 590                         return NULL;
 591                 }
 592         }
 593 #endif
 594         return(NULL);
 595 }
 596
 597 /****************************************************************************
 598  Check for authority to login to a service with a given username/password.
 599  Note this is *NOT* used when logging on using sessionsetup_and_X.
 600 ****************************************************************************/
 601
 602 bool authorise_login(struct smbd_server_connection *sconn,
 603                      int snum, fstring user, DATA_BLOB password,
 604                      bool *guest)
 605 {
 606         bool ok = False;
 607         struct auth_context *actx = sconn->smb1.negprot.auth_context;
 608         bool enc = sconn->smb1.negprot.encrypted_passwords;
 609
 610 #ifdef DEBUG_PASSWORD
 611         DEBUG(100,("authorise_login: checking authorisation on "
 612                    "user=%s pass=%s\n", user,password.data));
 613 #endif
 614
 615         *guest = False;
 616
 617         /* there are several possibilities:
 618                 1) login as the given user with given password
 619                 2) login as a previously registered username with the given
 620                    password
 621                 3) login as a session list username with the given password
 622                 4) login as a previously validated user/password pair
 623                 5) login as the "user =" user with given password
 624                 6) login as the "user =" user with no password
 625                    (guest connection)
 626                 7) login as guest user with no password
 627
 628                 if the service is guest_only then steps 1 to 5 are skipped
 629         */
 630
 631         /* now check the list of session users */
 632         if (!ok) {
 633                 char *auser;
 634                 char *user_list = NULL;
 635                 char *saveptr;
 636
 637                 if (sconn->smb1.sessions.session_userlist)
 638                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
 639                 else
 640                         user_list = SMB_STRDUP("");
 641
 642                 if (!user_list)
 643                         return(False);
 644
 645                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 646                      !ok && auser;
 647                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 648                         fstring user2;
 649                         fstrcpy(user2,auser);
 650                         if (!user_ok(user2,snum))
 651                                 continue;
 652
 653                         if (password_ok(actx, enc,
 654                                         get_session_workgroup(sconn),
 655                                         user2,
 656                                         sconn->remote_address,
 657                                         password)) {
 658                                 ok = True;
 659                                 strlcpy(user,user2,sizeof(fstring));
 660                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 661                                          "list username (%s) and given "
 662                                          "password ok\n", user));
 663                         }
 664                 }
 665
 666                 SAFE_FREE(user_list);
 667         }
 668
 669         /* check the user= fields and the given password */
 670         if (!ok && lp_username(snum)) {
 671                 TALLOC_CTX *ctx = talloc_tos();
 672                 char *auser;
 673                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 674                 char *saveptr;
 675
 676                 if (!user_list) {
 677                         goto check_guest;
 678                 }
 679
 680                 user_list = talloc_string_sub(ctx,
 681                                 user_list,
 682                                 "%S",
 683                                 lp_servicename(snum));
 684
 685                 if (!user_list) {
 686                         goto check_guest;
 687                 }
 688
 689                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 690                      auser && !ok;
 691                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 692                         if (*auser == '@') {
 693                                 auser = validate_group(sconn,auser+1,
 694                                                        password,snum);
 695                                 if (auser) {
 696                                         ok = True;
 697                                         fstrcpy(user,auser);
 698                                         DEBUG(3,("authorise_login: ACCEPTED: "
 699                                                  "group username and given "
 700                                                  "password ok (%s)\n", user));
 701                                 }
 702                         } else {
 703                                 fstring user2;
 704                                 fstrcpy(user2,auser);
 705                                 if (user_ok(user2,snum) &&
 706                                     password_ok(actx, enc,
 707                                                 get_session_workgroup(sconn),
 708                                                 user2,
 709                                                 sconn->remote_address,
 710                                                 password)) {
 711                                         ok = True;
 712                                         strlcpy(user,user2,sizeof(fstring));
 713                                         DEBUG(3,("authorise_login: ACCEPTED: "
 714                                                  "user list username and "
 715                                                  "given password ok (%s)\n",
 716                                                  user));
 717                                 }
 718                         }
 719                 }
 720         }
 721
 722   check_guest:
 723
 724         /* check for a normal guest connection */
 725         if (!ok && GUEST_OK(snum)) {
 726                 struct passwd *guest_pw;
 727                 fstring guestname;
 728                 fstrcpy(guestname,lp_guestaccount());
 729                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 730                 if (guest_pw != NULL) {
 731                         strlcpy(user,guestname,sizeof(fstring));
 732                         ok = True;
 733                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 734                                  "and guest ok (%s)\n", user));
 735                 } else {
 736                         DEBUG(0,("authorise_login: Invalid guest account "
 737                                  "%s??\n",guestname));
 738                 }
 739                 TALLOC_FREE(guest_pw);
 740                 *guest = True;
 741         }
 742
 743         if (ok && !user_ok(user, snum)) {
 744                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 745                 ok = False;
 746         }
 747
 748         return(ok);
 749 }