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         } else {
 432
 433                 /*
 434                  * Ok, innetgr is case sensitive. Try once more with lowercase
 435                  * just in case. Attempt to fix #703. JRA.
 436                  */
 437
 438                 fstrcpy(lowercase_user, user);
 439                 strlower_m(lowercase_user);
 440
 441                 DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
 442                         lowercase_user,
 443                         sconn->smb1.sessions.my_yp_domain?
 444                         sconn->smb1.sessions.my_yp_domain:"(ANY)",
 445                         ngname));
 446
 447                 if (innetgr(ngname, NULL, lowercase_user,
 448                             sconn->smb1.sessions.my_yp_domain)) {
 449                         DEBUG(5,("user_in_netgroup: Found\n"));
 450                         return true;
 451                 }
 452         }
 453 #endif /* HAVE_NETGROUP */
 454         return false;
 455 }
 456
 457 /****************************************************************************
 458  Check if a user is in a user list - can check combinations of UNIX
 459  and netgroup lists.
 460 ****************************************************************************/
 461
 462 bool user_in_list(struct smbd_server_connection *sconn,
 463                   const char *user,const char **list)
 464 {
 465         if (!list || !*list)
 466                 return False;
 467
 468         DEBUG(10,("user_in_list: checking user %s in list\n", user));
 469
 470         while (*list) {
 471
 472                 DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
 473                           user, *list));
 474
 475                 /*
 476                  * Check raw username.
 477                  */
 478                 if (strequal(user, *list))
 479                         return(True);
 480
 481                 /*
 482                  * Now check to see if any combination
 483                  * of UNIX and netgroups has been specified.
 484                  */
 485
 486                 if(**list == '@') {
 487                         /*
 488                          * Old behaviour. Check netgroup list
 489                          * followed by UNIX list.
 490                          */
 491                         if(user_in_netgroup(sconn, user, *list +1))
 492                                 return True;
 493                         if(user_in_group(user, *list +1))
 494                                 return True;
 495                 } else if (**list == '+') {
 496
 497                         if((*(*list +1)) == '&') {
 498                                 /*
 499                                  * Search UNIX list followed by netgroup.
 500                                  */
 501                                 if(user_in_group(user, *list +2))
 502                                         return True;
 503                                 if(user_in_netgroup(sconn, user, *list +2))
 504                                         return True;
 505
 506                         } else {
 507
 508                                 /*
 509                                  * Just search UNIX list.
 510                                  */
 511
 512                                 if(user_in_group(user, *list +1))
 513                                         return True;
 514                         }
 515
 516                 } else if (**list == '&') {
 517
 518                         if(*(*list +1) == '+') {
 519                                 /*
 520                                  * Search netgroup list followed by UNIX list.
 521                                  */
 522                                 if(user_in_netgroup(sconn, user, *list +2))
 523                                         return True;
 524                                 if(user_in_group(user, *list +2))
 525                                         return True;
 526                         } else {
 527                                 /*
 528                                  * Just search netgroup list.
 529                                  */
 530                                 if(user_in_netgroup(sconn, user, *list +1))
 531                                         return True;
 532                         }
 533                 }
 534
 535                 list++;
 536         }
 537         return(False);
 538 }
 539
 540 /****************************************************************************
 541  Check if a username is valid.
 542 ****************************************************************************/
 543
 544 static bool user_ok(struct smbd_server_connection *sconn,
 545                     const char *user, int snum)
 546 {
 547         char **valid, **invalid;
 548         bool ret;
 549
 550         valid = invalid = NULL;
 551         ret = True;
 552
 553         if (lp_invalid_users(snum)) {
 554                 invalid = str_list_copy(talloc_tos(), lp_invalid_users(snum));
 555                 if (invalid &&
 556                     str_list_substitute(invalid, "%S", lp_servicename(snum))) {
 557
 558                         /* This is used in sec=share only, so no current user
 559                          * around to pass to str_list_sub_basic() */
 560
 561                         if ( invalid && str_list_sub_basic(invalid, "", "") ) {
 562                                 ret = !user_in_list(sconn, user,
 563                                                     (const char **)invalid);
 564                         }
 565                 }
 566         }
 567         TALLOC_FREE(invalid);
 568
 569         if (ret && lp_valid_users(snum)) {
 570                 valid = str_list_copy(talloc_tos(), lp_valid_users(snum));
 571                 if ( valid &&
 572                      str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
 573
 574                         /* This is used in sec=share only, so no current user
 575                          * around to pass to str_list_sub_basic() */
 576
 577                         if ( valid && str_list_sub_basic(valid, "", "") ) {
 578                                 ret = user_in_list(sconn, user,
 579                                                    (const char **)valid);
 580                         }
 581                 }
 582         }
 583         TALLOC_FREE(valid);
 584
 585         if (ret && lp_onlyuser(snum)) {
 586                 char **user_list = str_list_make_v3(
 587                         talloc_tos(), lp_username(snum), NULL);
 588                 if (user_list &&
 589                     str_list_substitute(user_list, "%S",
 590                                         lp_servicename(snum))) {
 591                         ret = user_in_list(sconn, user,
 592                                            (const char **)user_list);
 593                 }
 594                 TALLOC_FREE(user_list);
 595         }
 596
 597         return(ret);
 598 }
 599
 600 /****************************************************************************
 601  Validate a group username entry. Return the username or NULL.
 602 ****************************************************************************/
 603
 604 static char *validate_group(struct smbd_server_connection *sconn,
 605                             char *group, DATA_BLOB password,int snum)
 606 {
 607 #ifdef HAVE_NETGROUP
 608         {
 609                 char *host, *user, *domain;
 610                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 611                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 612                 setnetgrent(group);
 613                 while (getnetgrent(&host, &user, &domain)) {
 614                         if (user) {
 615                                 if (user_ok(sconn, user, snum) &&
 616                                     password_ok(actx, enc,
 617                                                 get_session_workgroup(sconn),
 618                                                 user,password)) {
 619                                         endnetgrent();
 620                                         return(user);
 621                                 }
 622                         }
 623                 }
 624                 endnetgrent();
 625         }
 626 #endif
 627
 628 #ifdef HAVE_GETGRENT
 629         {
 630                 struct group *gptr;
 631                 struct auth_context *actx = sconn->smb1.negprot.auth_context;
 632                 bool enc = sconn->smb1.negprot.encrypted_passwords;
 633
 634                 setgrent();
 635                 while ((gptr = (struct group *)getgrent())) {
 636                         if (strequal(gptr->gr_name,group))
 637                                 break;
 638                 }
 639
 640                 /*
 641                  * As user_ok can recurse doing a getgrent(), we must
 642                  * copy the member list onto the heap before
 643                  * use. Bug pointed out by leon@eatworms.swmed.edu.
 644                  */
 645
 646                 if (gptr) {
 647                         char *member_list = NULL;
 648                         size_t list_len = 0;
 649                         char *member;
 650                         int i;
 651
 652                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 653                                 list_len += strlen(gptr->gr_mem[i])+1;
 654                         }
 655                         list_len++;
 656
 657                         member_list = (char *)SMB_MALLOC(list_len);
 658                         if (!member_list) {
 659                                 endgrent();
 660                                 return NULL;
 661                         }
 662
 663                         *member_list = '\0';
 664                         member = member_list;
 665
 666                         for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
 667                                 size_t member_len = strlen(gptr->gr_mem[i])+1;
 668
 669                                 DEBUG(10,("validate_group: = gr_mem = "
 670                                           "%s\n", gptr->gr_mem[i]));
 671
 672                                 safe_strcpy(member, gptr->gr_mem[i],
 673                                         list_len - (member-member_list));
 674                                 member += member_len;
 675                         }
 676
 677                         endgrent();
 678
 679                         member = member_list;
 680                         while (*member) {
 681                                 if (user_ok(sconn, member,snum) &&
 682                                     password_ok(actx, enc,
 683                                                 get_session_workgroup(sconn),
 684                                                 member,password)) {
 685                                         char *name = talloc_strdup(talloc_tos(),
 686                                                                 member);
 687                                         SAFE_FREE(member_list);
 688                                         return name;
 689                                 }
 690
 691                                 DEBUG(10,("validate_group = member = %s\n",
 692                                           member));
 693
 694                                 member += strlen(member) + 1;
 695                         }
 696
 697                         SAFE_FREE(member_list);
 698                 } else {
 699                         endgrent();
 700                         return NULL;
 701                 }
 702         }
 703 #endif
 704         return(NULL);
 705 }
 706
 707 /****************************************************************************
 708  Check for authority to login to a service with a given username/password.
 709  Note this is *NOT* used when logging on using sessionsetup_and_X.
 710 ****************************************************************************/
 711
 712 bool authorise_login(struct smbd_server_connection *sconn,
 713                      int snum, fstring user, DATA_BLOB password,
 714                      bool *guest)
 715 {
 716         bool ok = False;
 717         struct auth_context *actx = sconn->smb1.negprot.auth_context;
 718         bool enc = sconn->smb1.negprot.encrypted_passwords;
 719
 720 #ifdef DEBUG_PASSWORD
 721         DEBUG(100,("authorise_login: checking authorisation on "
 722                    "user=%s pass=%s\n", user,password.data));
 723 #endif
 724
 725         *guest = False;
 726
 727         /* there are several possibilities:
 728                 1) login as the given user with given password
 729                 2) login as a previously registered username with the given
 730                    password
 731                 3) login as a session list username with the given password
 732                 4) login as a previously validated user/password pair
 733                 5) login as the "user =" user with given password
 734                 6) login as the "user =" user with no password
 735                    (guest connection)
 736                 7) login as guest user with no password
 737
 738                 if the service is guest_only then steps 1 to 5 are skipped
 739         */
 740
 741         /* now check the list of session users */
 742         if (!ok) {
 743                 char *auser;
 744                 char *user_list = NULL;
 745                 char *saveptr;
 746
 747                 if (sconn->smb1.sessions.session_userlist)
 748                         user_list = SMB_STRDUP(sconn->smb1.sessions.session_userlist);
 749                 else
 750                         user_list = SMB_STRDUP("");
 751
 752                 if (!user_list)
 753                         return(False);
 754
 755                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 756                      !ok && auser;
 757                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 758                         fstring user2;
 759                         fstrcpy(user2,auser);
 760                         if (!user_ok(sconn,user2,snum))
 761                                 continue;
 762
 763                         if (password_ok(actx, enc,
 764                                         get_session_workgroup(sconn),
 765                                         user2,password)) {
 766                                 ok = True;
 767                                 fstrcpy(user,user2);
 768                                 DEBUG(3,("authorise_login: ACCEPTED: session "
 769                                          "list username (%s) and given "
 770                                          "password ok\n", user));
 771                         }
 772                 }
 773
 774                 SAFE_FREE(user_list);
 775         }
 776
 777         /* check the user= fields and the given password */
 778         if (!ok && lp_username(snum)) {
 779                 TALLOC_CTX *ctx = talloc_tos();
 780                 char *auser;
 781                 char *user_list = talloc_strdup(ctx, lp_username(snum));
 782                 char *saveptr;
 783
 784                 if (!user_list) {
 785                         goto check_guest;
 786                 }
 787
 788                 user_list = talloc_string_sub(ctx,
 789                                 user_list,
 790                                 "%S",
 791                                 lp_servicename(snum));
 792
 793                 if (!user_list) {
 794                         goto check_guest;
 795                 }
 796
 797                 for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
 798                      auser && !ok;
 799                      auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
 800                         if (*auser == '@') {
 801                                 auser = validate_group(sconn,auser+1,
 802                                                        password,snum);
 803                                 if (auser) {
 804                                         ok = True;
 805                                         fstrcpy(user,auser);
 806                                         DEBUG(3,("authorise_login: ACCEPTED: "
 807                                                  "group username and given "
 808                                                  "password ok (%s)\n", user));
 809                                 }
 810                         } else {
 811                                 fstring user2;
 812                                 fstrcpy(user2,auser);
 813                                 if (user_ok(sconn,user2,snum) &&
 814                                     password_ok(actx, enc,
 815                                                 get_session_workgroup(sconn),
 816                                                 user2,password)) {
 817                                         ok = True;
 818                                         fstrcpy(user,user2);
 819                                         DEBUG(3,("authorise_login: ACCEPTED: "
 820                                                  "user list username and "
 821                                                  "given password ok (%s)\n",
 822                                                  user));
 823                                 }
 824                         }
 825                 }
 826         }
 827
 828   check_guest:
 829
 830         /* check for a normal guest connection */
 831         if (!ok && GUEST_OK(snum)) {
 832                 struct passwd *guest_pw;
 833                 fstring guestname;
 834                 fstrcpy(guestname,lp_guestaccount());
 835                 guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
 836                 if (guest_pw != NULL) {
 837                         fstrcpy(user,guestname);
 838                         ok = True;
 839                         DEBUG(3,("authorise_login: ACCEPTED: guest account "
 840                                  "and guest ok (%s)\n", user));
 841                 } else {
 842                         DEBUG(0,("authorise_login: Invalid guest account "
 843                                  "%s??\n",guestname));
 844                 }
 845                 TALLOC_FREE(guest_pw);
 846                 *guest = True;
 847         }
 848
 849         if (ok && !user_ok(sconn, user, snum)) {
 850                 DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
 851                 ok = False;
 852         }
 853
 854         return(ok);
 855 }