source3/smbd/password.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Password and authentication handling
   4    Copyright (C) Andrew Tridgell 1992-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/globals.h"
  23
  24 enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
  25                                 SERVER_ALLOCATED_REQUIRED_NO,
  26                                 SERVER_ALLOCATED_REQUIRED_ANY};
  27
  28 static user_struct *get_valid_user_struct_internal(
  29                         struct smbd_server_connection *sconn,
  30                         uint16 vuid,
  31                         enum server_allocated_state server_allocated)
  32 {
  33         user_struct *usp;
  34         int count=0;
  35
  36         if (vuid == UID_FIELD_INVALID)
  37                 return NULL;
  38
  39         usp=sconn->smb1.sessions.validated_users;
  40         for (;usp;usp=usp->next,count++) {
  41                 if (vuid == usp->vuid) {
  42                         switch (server_allocated) {
  43                                 case SERVER_ALLOCATED_REQUIRED_YES:
  44                                         if (usp->server_info == NULL) {
  45                                                 continue;
  46                                         }
  47                                         break;
  48                                 case SERVER_ALLOCATED_REQUIRED_NO:
  49                                         if (usp->server_info != NULL) {
  50                                                 continue;
  51                                         }
  52                                 case SERVER_ALLOCATED_REQUIRED_ANY:
  53                                         break;
  54                         }
  55                         if (count > 10) {
  56                                 DLIST_PROMOTE(sconn->smb1.sessions.validated_users,
  57                                               usp);
  58                         }
  59                         return usp;
  60                 }
  61         }
  62
  63         return NULL;
  64 }
  65
  66 /****************************************************************************
  67  Check if a uid has been validated, and return an pointer to the user_struct
  68  if it has. NULL if not. vuid is biased by an offset. This allows us to
  69  tell random client vuid's (normally zero) from valid vuids.
  70 ****************************************************************************/
  71
  72 user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
  73                                    uint16 vuid)
  74 {
  75         return get_valid_user_struct_internal(sconn, vuid,
  76                         SERVER_ALLOCATED_REQUIRED_YES);
  77 }
  78
  79 bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
  80 {
  81         return (get_partial_auth_user_struct(sconn, vuid) != NULL);
  82 }
  83
  84 /****************************************************************************
  85  Get the user struct of a partial NTLMSSP login
  86 ****************************************************************************/
  87
  88 user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
  89                                           uint16 vuid)
  90 {
  91         return get_valid_user_struct_internal(sconn, vuid,
  92                         SERVER_ALLOCATED_REQUIRED_NO);
  93 }
  94
  95 /****************************************************************************
  96  Invalidate a uid.
  97 ****************************************************************************/
  98
  99 void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
 100 {
 101         user_struct *vuser = NULL;
 102
 103         vuser = get_valid_user_struct_internal(sconn, vuid,
 104                         SERVER_ALLOCATED_REQUIRED_ANY);
 105         if (vuser == NULL) {
 106                 return;
 107         }
 108
 109         session_yield(vuser);
 110
 111         if (vuser->auth_ntlmssp_state) {
 112                 auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
 113         }
 114
 115         DLIST_REMOVE(sconn->smb1.sessions.validated_users, vuser);
 116
 117         /* clear the vuid from the 'cache' on each connection, and
 118            from the vuid 'owner' of connections */
 119         conn_clear_vuid_caches(sconn, vuid);
 120
 121         TALLOC_FREE(vuser);
 122         sconn->smb1.sessions.num_validated_vuids--;
 123 }
 124
 125 /****************************************************************************
 126  Invalidate all vuid entries for this process.
 127 ****************************************************************************/
 128
 129 void invalidate_all_vuids(struct smbd_server_connection *sconn)
 130 {
 131         while (sconn->smb1.sessions.validated_users != NULL) {
 132                 invalidate_vuid(sconn,
 133                                 sconn->smb1.sessions.validated_users->vuid);
 134         }
 135 }
 136
 137 static void increment_next_vuid(uint16_t *vuid)
 138 {
 139         *vuid += 1;
 140
 141         /* Check for vuid wrap. */
 142         if (*vuid == UID_FIELD_INVALID) {
 143                 *vuid = VUID_OFFSET;
 144         }
 145 }
 146
 147 /****************************************************
 148  Create a new partial auth user struct.
 149 *****************************************************/
 150
 151 int register_initial_vuid(struct smbd_server_connection *sconn)
 152 {
 153         user_struct *vuser;
 154
 155         /* Paranoia check. */
 156         if(lp_security() == SEC_SHARE) {
 157                 smb_panic("register_initial_vuid: "
 158                         "Tried to register uid in security=share");
 159         }
 160
 161         /* Limit allowed vuids to 16bits - VUID_OFFSET. */
 162         if (sconn->smb1.sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
 163                 return UID_FIELD_INVALID;
 164         }
 165
 166         if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
 167                 DEBUG(0,("register_initial_vuid: "
 168                                 "Failed to talloc users struct!\n"));
 169                 return UID_FIELD_INVALID;
 170         }
 171
 172         /* Allocate a free vuid. Yes this is a linear search... */
 173         while( get_valid_user_struct_internal(sconn,
 174                         sconn->smb1.sessions.next_vuid,
 175                         SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
 176                 increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 177         }
 178
 179         DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
 180                 (unsigned int)sconn->smb1.sessions.next_vuid ));
 181
 182         vuser->vuid = sconn->smb1.sessions.next_vuid;
 183
 184         /*
 185          * This happens in an unfinished NTLMSSP session setup. We
 186          * need to allocate a vuid between the first and second calls
 187          * to NTLMSSP.
 188          */
 189         increment_next_vuid(&sconn->smb1.sessions.next_vuid);
 190         sconn->smb1.sessions.num_validated_vuids++;
 191
 192         DLIST_ADD(sconn->smb1.sessions.validated_users, vuser);
 193         return vuser->vuid;
 194 }
 195
 196 static int register_homes_share(const char *username)
 197 {
 198         int result;
 199         struct passwd *pwd;
 200
 201         result = lp_servicenumber(username);
 202         if (result != -1) {
 203                 DEBUG(3, ("Using static (or previously created) service for "
 204                           "user '%s'; path = '%s'\n", username,
 205                           lp_pathname(result)));
 206                 return result;
 207         }
 208
 209         pwd = getpwnam_alloc(talloc_tos(), username);
 210
 211         if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
 212                 DEBUG(3, ("No home directory defined for user '%s'\n",
 213                           username));
 214                 TALLOC_FREE(pwd);
 215                 return -1;
 216         }
 217
 218         DEBUG(3, ("Adding homes service for user '%s' using home directory: "
 219                   "'%s'\n", username, pwd->pw_dir));
 220
 221         result = add_home_service(username, username, pwd->pw_dir);
 222
 223         TALLOC_FREE(pwd);
 224         return result;
 225 }
 226
 227 /**
 228  *  register that a valid login has been performed, establish 'session'.
 229  *  @param server_info The token returned from the authentication process.
 230  *   (now 'owned' by register_existing_vuid)
 231  *
 232  *  @param session_key The User session key for the login session (now also
 233  *  'owned' by register_existing_vuid)
 234  *
 235  *  @param respose_blob The NT challenge-response, if available.  (May be
 236  *  freed after this call)
 237  *
 238  *  @param smb_name The untranslated name of the user
 239  *
 240  *  @return Newly allocated vuid, biased by an offset. (This allows us to
 241  *   tell random client vuid's (normally zero) from valid vuids.)
 242  *
 243  */
 244
 245 int register_existing_vuid(struct smbd_server_connection *sconn,
 246                         uint16 vuid,
 247                         auth_serversupplied_info *server_info,
 248                         DATA_BLOB response_blob,
 249                         const char *smb_name)
 250 {
 251         fstring tmp;
 252         user_struct *vuser;
 253
 254         vuser = get_partial_auth_user_struct(sconn, vuid);
 255         if (!vuser) {
 256                 goto fail;
 257         }
 258
 259         /* Use this to keep tabs on all our info from the authentication */
 260         vuser->server_info = talloc_move(vuser, &server_info);
 261
 262         /* This is a potentially untrusted username */
 263         alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));
 264
 265         vuser->server_info->sanitized_username = talloc_strdup(
 266                 vuser->server_info, tmp);
 267
 268         DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
 269                   (unsigned int)vuser->server_info->utok.uid,
 270                   (unsigned int)vuser->server_info->utok.gid,
 271                   vuser->server_info->unix_name,
 272                   vuser->server_info->sanitized_username,
 273                   pdb_get_domain(vuser->server_info->sam_account),
 274                   vuser->server_info->guest ));
 275
 276         DEBUG(3, ("register_existing_vuid: User name: %s\t"
 277                   "Real name: %s\n", vuser->server_info->unix_name,
 278                   pdb_get_fullname(vuser->server_info->sam_account)));
 279
 280         if (!vuser->server_info->ptok) {
 281                 DEBUG(1, ("register_existing_vuid: server_info does not "
 282                         "contain a user_token - cannot continue\n"));
 283                 goto fail;
 284         }
 285
 286         DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
 287                 "and will be vuid %u\n", (int)vuser->server_info->utok.uid,
 288                  vuser->server_info->unix_name, vuser->vuid));
 289
 290         if (!session_claim(vuser)) {
 291                 DEBUG(1, ("register_existing_vuid: Failed to claim session "
 292                         "for vuid=%d\n",
 293                         vuser->vuid));
 294                 goto fail;
 295         }
 296
 297         /* Register a home dir service for this user if
 298         (a) This is not a guest connection,
 299         (b) we have a home directory defined
 300         (c) there s not an existing static share by that name
 301         If a share exists by this name (autoloaded or not) reuse it . */
 302
 303         vuser->homes_snum = -1;
 304
 305         if (!vuser->server_info->guest) {
 306                 vuser->homes_snum = register_homes_share(
 307                         vuser->server_info->unix_name);
 308         }
 309
 310         if (srv_is_signing_negotiated(smbd_server_conn) &&
 311             !vuser->server_info->guest) {
 312                 /* Try and turn on server signing on the first non-guest
 313                  * sessionsetup. */
 314                 srv_set_signing(smbd_server_conn,
 315                                 vuser->server_info->user_session_key,
 316                                 response_blob);
 317         }
 318
 319         /* fill in the current_user_info struct */
 320         set_current_user_info(
 321                 vuser->server_info->sanitized_username,
 322                 vuser->server_info->unix_name,
 323                 pdb_get_domain(vuser->server_info->sam_account));
 324
 325         return vuser->vuid;
 326
 327   fail:
 328
 329         if (vuser) {
 330                 invalidate_vuid(sconn, vuid);
 331         }
 332         return UID_FIELD_INVALID;
 333 }
 334
 335 /****************************************************************************
 336  Add a name to the session users list.
 337 ****************************************************************************/
 338
 339 void add_session_user(struct smbd_server_connection *sconn,
 340                       const char *user)
 341 {
 342         struct passwd *pw;
 343         char *tmp;
 344
 345         pw = Get_Pwnam_alloc(talloc_tos(), user);
 346
 347         if (pw == NULL) {
 348                 return;
 349         }
 350
 351         if (sconn->smb1.sessions.session_userlist == NULL) {
 352                 sconn->smb1.sessions.session_userlist = SMB_STRDUP(pw->pw_name);
 353                 goto done;
 354         }
 355
 356         if (in_list(pw->pw_name,sconn->smb1.sessions.session_userlist,false)) {
 357                 goto done;
 358         }
 359
 360         if (strlen(sconn->smb1.sessions.session_userlist) > 128 * 1024) {
 361                 DEBUG(3,("add_session_user: session userlist already "
 362                          "too large.\n"));
 363                 goto done;
 364         }
 365
 366         if (asprintf(&tmp, "%s %s",
 367                      sconn->smb1.sessions.session_userlist, pw->pw_name) == -1) {
 368                 DEBUG(3, ("asprintf failed\n"));
 369                 goto done;
 370         }
 371
 372         SAFE_FREE(sconn->smb1.sessions.session_userlist);
 373         sconn->smb1.sessions.session_userlist = tmp;
 374  done:
 375         TALLOC_FREE(pw);
 376 }
 377
 378 /****************************************************************************
 379  In security=share mode we need to store the client workgroup, as that's
 380   what Vista uses for the NTLMv2 calculation.
 381 ****************************************************************************/
 382
 383 void add_session_workgroup(struct smbd_server_connection *sconn,
 384                            const char *workgroup)
 385 {
 386         if (sconn->smb1.sessions.session_workgroup) {
 387                 SAFE_FREE(sconn->smb1.sessions.session_workgroup);
 388         }
 389         sconn->smb1.sessions.session_workgroup = smb_xstrdup(workgroup);
 390 }
 391
 392 /****************************************************************************
 393  In security=share mode we need to return the client workgroup, as that's
 394   what Vista uses for the NTLMv2 calculation.
 395 ****************************************************************************/
 396
 397 const char *get_session_workgroup(struct smbd_server_connection *sconn)
 398 {
 399         return sconn->smb1.sessions.session_workgroup;
 400 }
 401
 402 /****************************************************************************
 403  Check if a user is in a netgroup user list. If at first we don't succeed,
 404  try lower case.
 405 ****************************************************************************/
 406
 407 bool user_in_netgroup(struct smbd_server_connection *sconn,
 408                       const char *user, const char *ngname)
 409 {
 410 #ifdef HAVE_NETGROUP
 411         fstring lowercase_user;
 412
 413         if (sconn->smb1.sessions.my_yp_domain == NULL) {
 414                 yp_get_default_domain(&sconn->smb1.sessions.my_yp_domain);
 415         }
 416
 417         if (sconn->smb1.sessions.my_yp_domain == NULL) {
 418                 DEBUG(5,("Unable to get default yp domain, "
 419                         "let's try without specifying it\n"));
 420         }
 421
 422         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 423                 user,
 424                 sconn->smb1.sessions.my_yp_domain?
 425                 sconn->smb1.sessions.my_yp_domain:"(ANY)",
 426                 ngname));
 427
 428         if (innetgr(ngname, NULL, user, sconn->smb1.sessions.my_yp_domain)) {
 429                 DEBUG(5,("user_in_netgroup: Found\n"));
 430                 return true;
 431         }
 432
 433         /*
 434          * Ok, innetgr is case sensitive. Try once more with lowercase
 435          * just in case. Attempt to fix #703. JRA.
 436          */
 437         fstrcpy(lowercase_user, user);
 438         strlower_m(lowercase_user);
 439
 440         if (strcmp(user,lowercase_user) == 0) {
 441                 /* user name was already lower case! */
 442                 return false;
 443         }
 444
 445         DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 446                 lowercase_user,
 447                 sconn->smb1.sessions.my_yp_domain?
 448                 sconn->smb1.sessions.my_yp_domain:"(ANY)",
 449                 ngname));
 450
 451         if (innetgr(ngname, NULL, lowercase_user,
 452                     sconn->smb1.sessions.my_yp_domain)) {
 453                 DEBUG(5,("user_in_netgroup: Found\n"));
 454                 return true;
 455         }
 456 #endif /* HAVE_NETGROUP */
 457         return false;
 458 }
 459
 460 /****************************************************************************
 461  Check if a user is in a user list - can check combinations of UNIX
 462  and netgroup lists.
 463 ****************************************************************************/
 464
 465 bool user_in_list(struct smbd_server_connection *sconn,
 466                   const char *user,const char **list)
 467 {
 468         if (!list || !*list)
 469                 return False;
 470
 471         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 472
 473         while (*list) {
 474
 475                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 476                           user, *list));
 477
 478                 /*
 479                  * Check raw username.
 480                  */
 481                 if (strequal(user, *list))
 482                         return(True);
 483
 484                 /*
 485                  * Now check to see if any combination
 486                  * of UNIX and netgroups has been specified.
 487                  */
 488
 489                 if(**list == '@') {
 490                         /*
 491                          * Old behaviour. Check netgroup list
 492                          * followed by UNIX list.
 493                          */
 494                         if(user_in_netgroup(sconn, user, *list +1))
 495                                 return True;
 496                         if(user_in_group(user, *list +1))
 497                                 return True;
 498                 } else if (**list == '+') {
 499
 500                         if((*(*list +1)) == '&') {
 501                                 /*
 502                                  * Search UNIX list followed by netgroup.
 503                                  */
 504                                 if(user_in_group(user, *list +2))
 505                                         return True;
 506                                 if(user_in_netgroup(sconn, user, *list +2))
 507                                         return True;
 508
 509                         } else {
 510
 511                                 /*
 512                                  * Just search UNIX list.
 513                                  */
 514
 515                                 if(user_in_group(user, *list +1))
 516                                         return True;
 517                         }
 518
 519                 } else if (**list == '&') {
 520
 521                         if(*(*list +1) == '+') {
 522                                 /*
 523                                  * Search netgroup list followed by UNIX list.
 524                                  */
 525                                 if(user_in_netgroup(sconn, user, *list +2))
 526                                         return True;
 527                                 if(user_in_group(user, *list +2))
 528                                         return True;
 529                         } else {
 530                                 /*
 531                                  * Just search netgroup list.
 532                                  */
 533                                 if(user_in_netgroup(sconn, user, *list +1))
 534                                         return True;
 535                         }
 536                 }
 537
 538                 list++;
 539         }
 540         return(False);
 541 }
 542
 543 /****************************************************************************
 544  Check if a username is valid.
 545 ****************************************************************************/
 546
 547 static bool user_ok(struct smbd_server_connection *sconn,
 548                     const char *user, int snum)
 549 {
 550         char **valid, **invalid;
 551         bool ret;
 552
 553         valid = invalid = NULL;
 554         ret = True;
 555
 556         if (lp_invalid_users(snum)) {
 557                 invalid = str_list_copy(talloc_tos(), lp_invalid_users(snum));
 558                 if (invalid &&
 559                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 560
 561                         /* This is used in sec=share only, so no current user
 562                          * around to pass to str_list_sub_basic() */
 563
 564                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 565                                 ret = !user_in_list(sconn, user,
 566                                                     (const char **)invalid);
 567                         }
 568                 }
 569         }
 570         TALLOC_FREE(invalid);
 571
 572         if (ret && lp_valid_users(snum)) {
 573                 valid = str_list_copy(talloc_tos(), lp_valid_users(snum));
 574                 if ( valid &&
 575                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 576
 577                         /* This is used in sec=share only, so no current user
 578                          * around to pass to str_list_sub_basic() */
 579
 580                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 581                                 ret = user_in_list(sconn, user,
 582                                                    (const char **)valid);
 583                         }
 584                 }
 585         }
 586         TALLOC_FREE(valid);
 587
 588         if (ret && lp_onlyuser(snum)) {
 589                 char **user_list = str_list_make_v3(
 590                         talloc_tos(), lp_username(snum), NULL);
 591                 if (user_list &&
 592                     str_list_substitute(user_list, "%S",
 593                                         lp_servicename(snum))) {
 594                         ret = user_in_list(sconn, user,
 595                                            (const char **)user_list);
 596                 }
 597                 TALLOC_FREE(user_list);
 598         }
 599
 600         return(ret);
 601 }
 602
 603 /****************************************************************************
 604  Validate a group username entry. Return the username or NULL.
 605 ****************************************************************************/
 606
 607 static char *validate_group(struct smbd_server_connection *sconn,
 608                             char *group, DATA_BLOB password,int snum)
 609 {
 610 #ifdef HAVE_NETGROUP
 611         {
 612                 char *host, *user, *domain;
 613                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 614                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 615                 setnetgrent(group);
 616                 while (getnetgrent(&host, &user, &domain)) {
 617                         if (user) {
 618                                 if (user_ok(sconn, user, snum) &&
 619                                     password_ok(actx, enc,
 620                                                 get_session_workgroup(sconn),
 621                                                 user,password)) {
 622                                         endnetgrent();
 623                                         return(user);
 624                                 }
 625                         }
 626                 }
 627                 endnetgrent();
 628         }
 629 #endif
 630
 631 #ifdef HAVE_GETGRENT
 632         {
 633                 struct group *gptr;
 634                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 635                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 636
 637                 setgrent();
 638                 while ((gptr = (struct group *)getgrent())) {
 639                         if (strequal(gptr->gr_name,group))
 640                                 break;
 641                 }
 642
 643                 /*
 644                  * As user_ok can recurse doing a getgrent(), we must
 645                  * copy the member list onto the heap before
 646                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 647                  */
 648
 649                 if (gptr) {
 650                         char *member_list = NULL;
 651                         size_t list_len = 0;
 652                         char *member;
 653                         int i;
 654
 655                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 656                                 list_len += strlen(gptr->gr_mem[i])+1;
 657                         }
 658                         list_len++;
 659
 660                         member_list = (char *)SMB_MALLOC(list_len);
 661                         if (!member_list) {
 662                                 endgrent();
 663                                 return NULL;
 664                         }
 665
 666                         *member_list = '\0';
 667                         member = member_list;
 668
 669                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 670                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 671
 672                                 DEBUG(10,("validate_group: = gr_mem = "
 673                                           "%s\n", gptr->gr_mem[i]));
 674
 675                                 safe_strcpy(member, gptr->gr_mem[i],
 676                                         list_len - (member-member_list));
 677                                 member += member_len;
 678                         }
 679
 680                         endgrent();
 681
 682                         member = member_list;
 683                         while (*member) {
 684                                 if (user_ok(sconn, member,snum) &&
 685                                     password_ok(actx, enc,
 686                                                 get_session_workgroup(sconn),
 687                                                 member,password)) {
 688                                         char *name = talloc_strdup(talloc_tos(),
 689                                                                 member);
 690                                         SAFE_FREE(member_list);
 691                                         return name;
 692                                 }
 693
 694                                 DEBUG(10,("validate_group = member = %s\n",
 695                                           member));
 696
 697                                 member += strlen(member) + 1;
 698                         }
 699
 700                         SAFE_FREE(member_list);
 701                 } else {
 702                         endgrent();
 703                         return NULL;
 704                 }
 705         }
 706 #endif
 707         return(NULL);
 708 }
 709
 710 /****************************************************************************
 711  Check for authority to login to a service with a given username/password.
 712  Note this is *NOT* used when logging on using sessionsetup_and_X.
 713 ****************************************************************************/
 714
 715 bool authorise_login(struct smbd_server_connection *sconn,
 716                      int snum, fstring user, DATA_BLOB password,
 717                      bool *guest)
 718 {
 719         bool ok = False;
 720         struct auth_context *actx = sconn->smb1.negprot.auth_context;
 721         bool enc = sconn->smb1.negprot.encrypted_passwords;
 722
 723 #ifdef DEBUG_PASSWORD
 724         DEBUG(100,("authorise_login: checking authorisation on "
 725                    "user=%s pass=%s\n", user,password.data));
 726 #endif
 727
 728         *guest = False;
 729
 730         /* there are several possibilities:
 731                 1) login as the given user with given password
 732                 2) login as a previously registered username with the given
 733                    password
 734                 3) login as a session list username with the given password
 735                 4) login as a previously validated user/password pair
 736                 5) login as the "user =" user with given password
 737                 6) login as the "user =" user with no password
 738                    (guest connection)
 739                 7) login as guest user with no password
 740
 741                 if the service is guest_only then steps 1 to 5 are skipped
 742         */
 743
 744         /* now check the list of session users */
 745         if (!ok) {
 746                 char *auser;
 747                 char *user_list = NULL;
 748                 char *saveptr;
 749
 750                 if (sconn->smb1.sessions.session_userlist)
 751                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
 752                 else
 753                         user_list = SMB_STRDUP("");
 754
 755                 if (!user_list)
 756                         return(False);
 757
 758                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 759                      !ok && auser;
 760                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 761                         fstring user2;
 762                         fstrcpy(user2,auser);
 763                         if (!user_ok(sconn,user2,snum))
 764                                 continue;
 765
 766                         if (password_ok(actx, enc,
 767                                         get_session_workgroup(sconn),
 768                                         user2,password)) {
 769                                 ok = True;
 770                                 fstrcpy(user,user2);
 771                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 772                                          "list username (%s) and given "
 773                                          "password ok\n", user));
 774                         }
 775                 }
 776
 777                 SAFE_FREE(user_list);
 778         }
 779
 780         /* check the user= fields and the given password */
 781         if (!ok && lp_username(snum)) {
 782                 TALLOC_CTX *ctx = talloc_tos();
 783                 char *auser;
 784                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 785                 char *saveptr;
 786
 787                 if (!user_list) {
 788                         goto check_guest;
 789                 }
 790
 791                 user_list = talloc_string_sub(ctx,
 792                                 user_list,
 793                                 "%S",
 794                                 lp_servicename(snum));
 795
 796                 if (!user_list) {
 797                         goto check_guest;
 798                 }
 799
 800                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 801                      auser && !ok;
 802                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 803                         if (*auser == '@') {
 804                                 auser = validate_group(sconn,auser+1,
 805                                                        password,snum);
 806                                 if (auser) {
 807                                         ok = True;
 808                                         fstrcpy(user,auser);
 809                                         DEBUG(3,("authorise_login: ACCEPTED: "
 810                                                  "group username and given "
 811                                                  "password ok (%s)\n", user));
 812                                 }
 813                         } else {
 814                                 fstring user2;
 815                                 fstrcpy(user2,auser);
 816                                 if (user_ok(sconn,user2,snum) &&
 817                                     password_ok(actx, enc,
 818                                                 get_session_workgroup(sconn),
 819                                                 user2,password)) {
 820                                         ok = True;
 821                                         fstrcpy(user,user2);
 822                                         DEBUG(3,("authorise_login: ACCEPTED: "
 823                                                  "user list username and "
 824                                                  "given password ok (%s)\n",
 825                                                  user));
 826                                 }
 827                         }
 828                 }
 829         }
 830
 831   check_guest:
 832
 833         /* check for a normal guest connection */
 834         if (!ok && GUEST_OK(snum)) {
 835                 struct passwd *guest_pw;
 836                 fstring guestname;
 837                 fstrcpy(guestname,lp_guestaccount());
 838                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 839                 if (guest_pw != NULL) {
 840                         fstrcpy(user,guestname);
 841                         ok = True;
 842                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 843                                  "and guest ok (%s)\n", user));
 844                 } else {
 845                         DEBUG(0,("authorise_login: Invalid guest account "
 846                                  "%s??\n",guestname));
 847                 }
 848                 TALLOC_FREE(guest_pw);
 849                 *guest = True;
 850         }
 851
 852         if (ok && !user_ok(sconn, user, snum)) {
 853                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 854                 ok = False;
 855         }
 856
 857         return(ok);
 858 }