source3/smbd/service.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    service (connection) opening and closing
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "smbd/globals.h"
  22
  23 extern userdom_struct current_user_info;
  24
  25 static bool canonicalize_connect_path(connection_struct *conn)
  26 {
  27 #ifdef REALPATH_TAKES_NULL
  28         bool ret;
  29         char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,NULL);
  30         if (!resolved_name) {
  31                 return false;
  32         }
  33         ret = set_conn_connectpath(conn,resolved_name);
  34         SAFE_FREE(resolved_name);
  35         return ret;
  36 #else
  37         char resolved_name_buf[PATH_MAX+1];
  38         char *resolved_name = SMB_VFS_REALPATH(conn,conn->connectpath,resolved_name_buf);
  39         if (!resolved_name) {
  40                 return false;
  41         }
  42         return set_conn_connectpath(conn,resolved_name);
  43 #endif /* REALPATH_TAKES_NULL */
  44 }
  45
  46 /****************************************************************************
  47  Ensure when setting connectpath it is a canonicalized (no ./ // or ../)
  48  absolute path stating in / and not ending in /.
  49  Observent people will notice a similarity between this and check_path_syntax :-).
  50 ****************************************************************************/
  51
  52 bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
  53 {
  54         char *destname;
  55         char *d;
  56         const char *s = connectpath;
  57         bool start_of_name_component = true;
  58
  59         if (connectpath == NULL || connectpath[0] == '\0') {
  60                 return false;
  61         }
  62
  63         /* Allocate for strlen + '\0' + possible leading '/' */
  64         destname = (char *)SMB_MALLOC(strlen(connectpath) + 2);
  65         if (!destname) {
  66                 return false;
  67         }
  68         d = destname;
  69
  70         *d++ = '/'; /* Always start with root. */
  71
  72         while (*s) {
  73                 if (*s == '/') {
  74                         /* Eat multiple '/' */
  75                         while (*s == '/') {
  76                                 s++;
  77                         }
  78                         if ((d > destname + 1) && (*s != '\0')) {
  79                                 *d++ = '/';
  80                         }
  81                         start_of_name_component = True;
  82                         continue;
  83                 }
  84
  85                 if (start_of_name_component) {
  86                         if ((s[0] == '.') && (s[1] == '.') && (s[2] == '/' || s[2] == '\0')) {
  87                                 /* Uh oh - "/../" or "/..\0" ! */
  88
  89                                 /* Go past the ../ or .. */
  90                                 if (s[2] == '/') {
  91                                         s += 3;
  92                                 } else {
  93                                         s += 2; /* Go past the .. */
  94                                 }
  95
  96                                 /* If  we just added a '/' - delete it */
  97                                 if ((d > destname) && (*(d-1) == '/')) {
  98                                         *(d-1) = '\0';
  99                                         d--;
 100                                 }
 101
 102                                 /* Are we at the start ? Can't go back further if so. */
 103                                 if (d <= destname) {
 104                                         *d++ = '/'; /* Can't delete root */
 105                                         continue;
 106                                 }
 107                                 /* Go back one level... */
 108                                 /* Decrement d first as d points to the *next* char to write into. */
 109                                 for (d--; d > destname; d--) {
 110                                         if (*d == '/') {
 111                                                 break;
 112                                         }
 113                                 }
 114                                 /* We're still at the start of a name component, just the previous one. */
 115                                 continue;
 116                         } else if ((s[0] == '.') && ((s[1] == '\0') || s[1] == '/')) {
 117                                 /* Component of pathname can't be "." only - skip the '.' . */
 118                                 if (s[1] == '/') {
 119                                         s += 2;
 120                                 } else {
 121                                         s++;
 122                                 }
 123                                 continue;
 124                         }
 125                 }
 126
 127                 if (!(*s & 0x80)) {
 128                         *d++ = *s++;
 129                 } else {
 130                         size_t siz;
 131                         /* Get the size of the next MB character. */
 132                         next_codepoint(s,&siz);
 133                         switch(siz) {
 134                                 case 5:
 135                                         *d++ = *s++;
 136                                         /*fall through*/
 137                                 case 4:
 138                                         *d++ = *s++;
 139                                         /*fall through*/
 140                                 case 3:
 141                                         *d++ = *s++;
 142                                         /*fall through*/
 143                                 case 2:
 144                                         *d++ = *s++;
 145                                         /*fall through*/
 146                                 case 1:
 147                                         *d++ = *s++;
 148                                         break;
 149                                 default:
 150                                         break;
 151                         }
 152                 }
 153                 start_of_name_component = false;
 154         }
 155         *d = '\0';
 156
 157         /* And must not end in '/' */
 158         if (d > destname + 1 && (*(d-1) == '/')) {
 159                 *(d-1) = '\0';
 160         }
 161
 162         DEBUG(10,("set_conn_connectpath: service %s, connectpath = %s\n",
 163                 lp_servicename(SNUM(conn)), destname ));
 164
 165         string_set(&conn->connectpath, destname);
 166         SAFE_FREE(destname);
 167         return true;
 168 }
 169
 170 /****************************************************************************
 171  Load parameters specific to a connection/service.
 172 ****************************************************************************/
 173
 174 bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
 175 {
 176         int snum;
 177
 178         if (!conn)  {
 179                 last_conn = NULL;
 180                 return(False);
 181         }
 182
 183         conn->lastused_count++;
 184
 185         snum = SNUM(conn);
 186
 187         if (do_chdir &&
 188             vfs_ChDir(conn,conn->connectpath) != 0 &&
 189             vfs_ChDir(conn,conn->origpath) != 0) {
 190                 DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
 191                          conn->connectpath, strerror(errno)));
 192                 return(False);
 193         }
 194
 195         if ((conn == last_conn) && (last_flags == flags)) {
 196                 return(True);
 197         }
 198
 199         last_conn = conn;
 200         last_flags = flags;
 201
 202         /* Obey the client case sensitivity requests - only for clients that support it. */
 203         switch (lp_casesensitive(snum)) {
 204                 case Auto:
 205                         {
 206                                 /* We need this uglyness due to DOS/Win9x clients that lie about case insensitivity. */
 207                                 enum remote_arch_types ra_type = get_remote_arch();
 208                                 if ((ra_type != RA_SAMBA) && (ra_type != RA_CIFSFS)) {
 209                                         /* Client can't support per-packet case sensitive pathnames. */
 210                                         conn->case_sensitive = False;
 211                                 } else {
 212                                         conn->case_sensitive = !(flags & FLAG_CASELESS_PATHNAMES);
 213                                 }
 214                         }
 215                         break;
 216                 case True:
 217                         conn->case_sensitive = True;
 218                         break;
 219                 default:
 220                         conn->case_sensitive = False;
 221                         break;
 222         }
 223         return(True);
 224 }
 225
 226 static int load_registry_service(const char *servicename)
 227 {
 228         if (!lp_registry_shares()) {
 229                 return -1;
 230         }
 231
 232         if ((servicename == NULL) || (*servicename == '\0')) {
 233                 return -1;
 234         }
 235
 236         if (strequal(servicename, GLOBAL_NAME)) {
 237                 return -2;
 238         }
 239
 240         if (!process_registry_service(servicename)) {
 241                 return -1;
 242         }
 243
 244         return lp_servicenumber(servicename);
 245 }
 246
 247 void load_registry_shares(void)
 248 {
 249         DEBUG(8, ("load_registry_shares()\n"));
 250         if (!lp_registry_shares()) {
 251                 return;
 252         }
 253
 254         process_registry_shares();
 255
 256         return;
 257 }
 258
 259 /****************************************************************************
 260  Add a home service. Returns the new service number or -1 if fail.
 261 ****************************************************************************/
 262
 263 int add_home_service(const char *service, const char *username, const char *homedir)
 264 {
 265         int iHomeService;
 266
 267         if (!service || !homedir || homedir[0] == '\0')
 268                 return -1;
 269
 270         if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
 271                 if ((iHomeService = load_registry_service(HOMES_NAME)) < 0) {
 272                         return -1;
 273                 }
 274         }
 275
 276         /*
 277          * If this is a winbindd provided username, remove
 278          * the domain component before adding the service.
 279          * Log a warning if the "path=" parameter does not
 280          * include any macros.
 281          */
 282
 283         {
 284                 const char *p = strchr(service,*lp_winbind_separator());
 285
 286                 /* We only want the 'user' part of the string */
 287                 if (p) {
 288                         service = p + 1;
 289                 }
 290         }
 291
 292         if (!lp_add_home(service, iHomeService, username, homedir)) {
 293                 return -1;
 294         }
 295
 296         return lp_servicenumber(service);
 297
 298 }
 299
 300 /**
 301  * Find a service entry.
 302  *
 303  * @param service is modified (to canonical form??)
 304  **/
 305
 306 int find_service(fstring service)
 307 {
 308         int iService;
 309         struct smbd_server_connection *sconn = smbd_server_conn;
 310
 311         all_string_sub(service,"\\","/",0);
 312
 313         iService = lp_servicenumber(service);
 314
 315         /* now handle the special case of a home directory */
 316         if (iService < 0) {
 317                 char *phome_dir = get_user_home_dir(talloc_tos(), service);
 318
 319                 if(!phome_dir) {
 320                         /*
 321                          * Try mapping the servicename, it may
 322                          * be a Windows to unix mapped user name.
 323                          */
 324                         if(map_username(sconn, service))
 325                                 phome_dir = get_user_home_dir(
 326                                         talloc_tos(), service);
 327                 }
 328
 329                 DEBUG(3,("checking for home directory %s gave %s\n",service,
 330                         phome_dir?phome_dir:"(NULL)"));
 331
 332                 iService = add_home_service(service,service /* 'username' */, phome_dir);
 333         }
 334
 335         /* If we still don't have a service, attempt to add it as a printer. */
 336         if (iService < 0) {
 337                 int iPrinterService;
 338
 339                 if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
 340                         iPrinterService = load_registry_service(PRINTERS_NAME);
 341                 }
 342                 if (iPrinterService >= 0) {
 343                         DEBUG(3,("checking whether %s is a valid printer name...\n", service));
 344                         if (pcap_printername_ok(service)) {
 345                                 DEBUG(3,("%s is a valid printer name\n", service));
 346                                 DEBUG(3,("adding %s as a printer service\n", service));
 347                                 lp_add_printer(service, iPrinterService);
 348                                 iService = lp_servicenumber(service);
 349                                 if (iService < 0) {
 350                                         DEBUG(0,("failed to add %s as a printer service!\n", service));
 351                                 }
 352                         } else {
 353                                 DEBUG(3,("%s is not a valid printer name\n", service));
 354                         }
 355                 }
 356         }
 357
 358         /* Check for default vfs service?  Unsure whether to implement this */
 359         if (iService < 0) {
 360         }
 361
 362         if (iService < 0) {
 363                 iService = load_registry_service(service);
 364         }
 365
 366         /* Is it a usershare service ? */
 367         if (iService < 0 && *lp_usershare_path()) {
 368                 /* Ensure the name is canonicalized. */
 369                 strlower_m(service);
 370                 iService = load_usershare_service(service);
 371         }
 372
 373         /* just possibly it's a default service? */
 374         if (iService < 0) {
 375                 char *pdefservice = lp_defaultservice();
 376                 if (pdefservice && *pdefservice && !strequal(pdefservice,service) && !strstr_m(service,"..")) {
 377                         /*
 378                          * We need to do a local copy here as lp_defaultservice()
 379                          * returns one of the rotating lp_string buffers that
 380                          * could get overwritten by the recursive find_service() call
 381                          * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
 382                          */
 383                         char *defservice = SMB_STRDUP(pdefservice);
 384
 385                         if (!defservice) {
 386                                 goto fail;
 387                         }
 388
 389                         /* Disallow anything except explicit share names. */
 390                         if (strequal(defservice,HOMES_NAME) ||
 391                                         strequal(defservice, PRINTERS_NAME) ||
 392                                         strequal(defservice, "IPC$")) {
 393                                 SAFE_FREE(defservice);
 394                                 goto fail;
 395                         }
 396
 397                         iService = find_service(defservice);
 398                         if (iService >= 0) {
 399                                 all_string_sub(service, "_","/",0);
 400                                 iService = lp_add_service(service, iService);
 401                         }
 402                         SAFE_FREE(defservice);
 403                 }
 404         }
 405
 406         if (iService >= 0) {
 407                 if (!VALID_SNUM(iService)) {
 408                         DEBUG(0,("Invalid snum %d for %s\n",iService, service));
 409                         iService = -1;
 410                 }
 411         }
 412
 413   fail:
 414
 415         if (iService < 0)
 416                 DEBUG(3,("find_service() failed to find service %s\n", service));
 417
 418         return (iService);
 419 }
 420
 421
 422 /****************************************************************************
 423  do some basic sainity checks on the share.
 424  This function modifies dev, ecode.
 425 ****************************************************************************/
 426
 427 static NTSTATUS share_sanity_checks(int snum, fstring dev)
 428 {
 429
 430         if (!lp_snum_ok(snum) ||
 431             !check_access(smbd_server_fd(),
 432                           lp_hostsallow(snum), lp_hostsdeny(snum))) {
 433                 return NT_STATUS_ACCESS_DENIED;
 434         }
 435
 436         if (dev[0] == '?' || !dev[0]) {
 437                 if (lp_print_ok(snum)) {
 438                         fstrcpy(dev,"LPT1:");
 439                 } else if (strequal(lp_fstype(snum), "IPC")) {
 440                         fstrcpy(dev, "IPC");
 441                 } else {
 442                         fstrcpy(dev,"A:");
 443                 }
 444         }
 445
 446         strupper_m(dev);
 447
 448         if (lp_print_ok(snum)) {
 449                 if (!strequal(dev, "LPT1:")) {
 450                         return NT_STATUS_BAD_DEVICE_TYPE;
 451                 }
 452         } else if (strequal(lp_fstype(snum), "IPC")) {
 453                 if (!strequal(dev, "IPC")) {
 454                         return NT_STATUS_BAD_DEVICE_TYPE;
 455                 }
 456         } else if (!strequal(dev, "A:")) {
 457                 return NT_STATUS_BAD_DEVICE_TYPE;
 458         }
 459
 460         /* Behave as a printer if we are supposed to */
 461         if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
 462                 fstrcpy(dev, "LPT1:");
 463         }
 464
 465         return NT_STATUS_OK;
 466 }
 467
 468 /*
 469  * Go through lookup_name etc to find the force'd group.
 470  *
 471  * Create a new token from src_token, replacing the primary group sid with the
 472  * one found.
 473  */
 474
 475 static NTSTATUS find_forced_group(bool force_user,
 476                                   int snum, const char *username,
 477                                   DOM_SID *pgroup_sid,
 478                                   gid_t *pgid)
 479 {
 480         NTSTATUS result = NT_STATUS_NO_SUCH_GROUP;
 481         TALLOC_CTX *frame = talloc_stackframe();
 482         DOM_SID group_sid;
 483         enum lsa_SidType type;
 484         char *groupname;
 485         bool user_must_be_member = False;
 486         gid_t gid;
 487
 488         groupname = talloc_strdup(talloc_tos(), lp_force_group(snum));
 489         if (groupname == NULL) {
 490                 DEBUG(1, ("talloc_strdup failed\n"));
 491                 result = NT_STATUS_NO_MEMORY;
 492                 goto done;
 493         }
 494
 495         if (groupname[0] == '+') {
 496                 user_must_be_member = True;
 497                 groupname += 1;
 498         }
 499
 500         groupname = talloc_string_sub(talloc_tos(), groupname,
 501                                       "%S", lp_servicename(snum));
 502         if (groupname == NULL) {
 503                 DEBUG(1, ("talloc_string_sub failed\n"));
 504                 result = NT_STATUS_NO_MEMORY;
 505                 goto done;
 506         }
 507
 508         if (!lookup_name_smbconf(talloc_tos(), groupname,
 509                          LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
 510                          NULL, NULL, &group_sid, &type)) {
 511                 DEBUG(10, ("lookup_name_smbconf(%s) failed\n",
 512                            groupname));
 513                 goto done;
 514         }
 515
 516         if ((type != SID_NAME_DOM_GRP) && (type != SID_NAME_ALIAS) &&
 517             (type != SID_NAME_WKN_GRP)) {
 518                 DEBUG(10, ("%s is a %s, not a group\n", groupname,
 519                            sid_type_lookup(type)));
 520                 goto done;
 521         }
 522
 523         if (!sid_to_gid(&group_sid, &gid)) {
 524                 DEBUG(10, ("sid_to_gid(%s) for %s failed\n",
 525                            sid_string_dbg(&group_sid), groupname));
 526                 goto done;
 527         }
 528
 529         /*
 530          * If the user has been forced and the forced group starts with a '+',
 531          * then we only set the group to be the forced group if the forced
 532          * user is a member of that group.  Otherwise, the meaning of the '+'
 533          * would be ignored.
 534          */
 535
 536         if (force_user && user_must_be_member) {
 537                 if (user_in_group_sid(username, &group_sid)) {
 538                         sid_copy(pgroup_sid, &group_sid);
 539                         *pgid = gid;
 540                         DEBUG(3,("Forced group %s for member %s\n",
 541                                  groupname, username));
 542                 } else {
 543                         DEBUG(0,("find_forced_group: forced user %s is not a member "
 544                                 "of forced group %s. Disallowing access.\n",
 545                                 username, groupname ));
 546                         result = NT_STATUS_MEMBER_NOT_IN_GROUP;
 547                         goto done;
 548                 }
 549         } else {
 550                 sid_copy(pgroup_sid, &group_sid);
 551                 *pgid = gid;
 552                 DEBUG(3,("Forced group %s\n", groupname));
 553         }
 554
 555         result = NT_STATUS_OK;
 556  done:
 557         TALLOC_FREE(frame);
 558         return result;
 559 }
 560
 561 /****************************************************************************
 562   Create an auth_serversupplied_info structure for a connection_struct
 563 ****************************************************************************/
 564
 565 static NTSTATUS create_connection_server_info(struct smbd_server_connection *sconn,
 566                                               TALLOC_CTX *mem_ctx, int snum,
 567                                               struct auth_serversupplied_info *vuid_serverinfo,
 568                                               DATA_BLOB password,
 569                                               struct auth_serversupplied_info **presult)
 570 {
 571         if (lp_guest_only(snum)) {
 572                 return make_server_info_guest(mem_ctx, presult);
 573         }
 574
 575         if (vuid_serverinfo != NULL) {
 576
 577                 struct auth_serversupplied_info *result;
 578
 579                 /*
 580                  * This is the normal security != share case where we have a
 581                  * valid vuid from the session setup.                 */
 582
 583                 if (vuid_serverinfo->guest) {
 584                         if (!lp_guest_ok(snum)) {
 585                                 DEBUG(2, ("guest user (from session setup) "
 586                                           "not permitted to access this share "
 587                                           "(%s)\n", lp_servicename(snum)));
 588                                 return NT_STATUS_ACCESS_DENIED;
 589                         }
 590                 } else {
 591                         if (!user_ok_token(vuid_serverinfo->unix_name,
 592                                            pdb_get_domain(vuid_serverinfo->sam_account),
 593                                            vuid_serverinfo->ptok, snum)) {
 594                                 DEBUG(2, ("user '%s' (from session setup) not "
 595                                           "permitted to access this share "
 596                                           "(%s)\n",
 597                                           vuid_serverinfo->unix_name,
 598                                           lp_servicename(snum)));
 599                                 return NT_STATUS_ACCESS_DENIED;
 600                         }
 601                 }
 602
 603                 result = copy_serverinfo(mem_ctx, vuid_serverinfo);
 604                 if (result == NULL) {
 605                         return NT_STATUS_NO_MEMORY;
 606                 }
 607
 608                 *presult = result;
 609                 return NT_STATUS_OK;
 610         }
 611
 612         if (lp_security() == SEC_SHARE) {
 613
 614                 fstring user;
 615                 bool guest;
 616
 617                 /* add the sharename as a possible user name if we
 618                    are in share mode security */
 619
 620                 add_session_user(sconn, lp_servicename(snum));
 621
 622                 /* shall we let them in? */
 623
 624                 if (!authorise_login(sconn, snum,user,password,&guest)) {
 625                         DEBUG( 2, ( "Invalid username/password for [%s]\n",
 626                                     lp_servicename(snum)) );
 627                         return NT_STATUS_WRONG_PASSWORD;
 628                 }
 629
 630                 return make_serverinfo_from_username(mem_ctx, user, guest,
 631                                                      presult);
 632         }
 633
 634         DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
 635         return NT_STATUS_ACCESS_DENIED;
 636 }
 637
 638
 639 /****************************************************************************
 640   Make a connection, given the snum to connect to, and the vuser of the
 641   connecting user if appropriate.
 642 ****************************************************************************/
 643
 644 connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
 645                                         int snum, user_struct *vuser,
 646                                         DATA_BLOB password,
 647                                         const char *pdev,
 648                                         NTSTATUS *pstatus)
 649 {
 650         connection_struct *conn = NULL;
 651         struct smb_filename *smb_fname_cpath = NULL;
 652         fstring dev;
 653         int ret;
 654         char addr[INET6_ADDRSTRLEN];
 655         bool on_err_call_dis_hook = false;
 656         bool claimed_connection = false;
 657         uid_t effuid;
 658         gid_t effgid;
 659         NTSTATUS status;
 660
 661         fstrcpy(dev, pdev);
 662
 663         if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
 664                 goto err_root_exit;
 665         }
 666
 667         conn = conn_new(sconn);
 668         if (!conn) {
 669                 DEBUG(0,("Couldn't find free connection.\n"));
 670                 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
 671                 goto err_root_exit;
 672         }
 673
 674         conn->params->service = snum;
 675
 676         status = create_connection_server_info(sconn,
 677                 conn, snum, vuser ? vuser->server_info : NULL, password,
 678                 &conn->server_info);
 679
 680         if (!NT_STATUS_IS_OK(status)) {
 681                 DEBUG(1, ("create_connection_server_info failed: %s\n",
 682                           nt_errstr(status)));
 683                 *pstatus = status;
 684                 goto err_root_exit;
 685         }
 686
 687         if ((lp_guest_only(snum)) || (lp_security() == SEC_SHARE)) {
 688                 conn->force_user = true;
 689         }
 690
 691         add_session_user(sconn, conn->server_info->unix_name);
 692
 693         safe_strcpy(conn->client_address,
 694                         client_addr(get_client_fd(),addr,sizeof(addr)),
 695                         sizeof(conn->client_address)-1);
 696         conn->num_files_open = 0;
 697         conn->lastused = conn->lastused_count = time(NULL);
 698         conn->used = True;
 699         conn->printer = (strncmp(dev,"LPT",3) == 0);
 700         conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
 701                       ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
 702
 703         /* Case options for the share. */
 704         if (lp_casesensitive(snum) == Auto) {
 705                 /* We will be setting this per packet. Set to be case
 706                  * insensitive for now. */
 707                 conn->case_sensitive = False;
 708         } else {
 709                 conn->case_sensitive = (bool)lp_casesensitive(snum);
 710         }
 711
 712         conn->case_preserve = lp_preservecase(snum);
 713         conn->short_case_preserve = lp_shortpreservecase(snum);
 714
 715         conn->encrypt_level = lp_smb_encrypt(snum);
 716
 717         conn->veto_list = NULL;
 718         conn->hide_list = NULL;
 719         conn->veto_oplock_list = NULL;
 720         conn->aio_write_behind_list = NULL;
 721
 722         conn->read_only = lp_readonly(SNUM(conn));
 723
 724         if (*lp_force_user(snum)) {
 725
 726                 /*
 727                  * Replace conn->server_info with a completely faked up one
 728                  * from the username we are forced into :-)
 729                  */
 730
 731                 char *fuser;
 732                 struct auth_serversupplied_info *forced_serverinfo;
 733
 734                 fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
 735                                           lp_servicename(snum));
 736                 if (fuser == NULL) {
 737                         *pstatus = NT_STATUS_NO_MEMORY;
 738                         goto err_root_exit;
 739                 }
 740
 741                 status = make_serverinfo_from_username(
 742                         conn, fuser, conn->server_info->guest,
 743                         &forced_serverinfo);
 744                 if (!NT_STATUS_IS_OK(status)) {
 745                         *pstatus = status;
 746                         goto err_root_exit;
 747                 }
 748
 749                 TALLOC_FREE(conn->server_info);
 750                 conn->server_info = forced_serverinfo;
 751
 752                 conn->force_user = True;
 753                 DEBUG(3,("Forced user %s\n", fuser));
 754         }
 755
 756         /*
 757          * If force group is true, then override
 758          * any groupid stored for the connecting user.
 759          */
 760
 761         if (*lp_force_group(snum)) {
 762
 763                 status = find_forced_group(
 764                         conn->force_user, snum, conn->server_info->unix_name,
 765                         &conn->server_info->ptok->user_sids[1],
 766                         &conn->server_info->utok.gid);
 767
 768                 if (!NT_STATUS_IS_OK(status)) {
 769                         *pstatus = status;
 770                         goto err_root_exit;
 771                 }
 772
 773                 /*
 774                  * We need to cache this gid, to use within
 775                  * change_to_user() separately from the conn->server_info
 776                  * struct. We only use conn->server_info directly if
 777                  * "force_user" was set.
 778                  */
 779                 conn->force_group_gid = conn->server_info->utok.gid;
 780         }
 781
 782         conn->vuid = (vuser != NULL) ? vuser->vuid : UID_FIELD_INVALID;
 783
 784         {
 785                 char *s = talloc_sub_advanced(talloc_tos(),
 786                                         lp_servicename(SNUM(conn)),
 787                                         conn->server_info->unix_name,
 788                                         conn->connectpath,
 789                                         conn->server_info->utok.gid,
 790                                         conn->server_info->sanitized_username,
 791                                         pdb_get_domain(conn->server_info->sam_account),
 792                                         lp_pathname(snum));
 793                 if (!s) {
 794                         *pstatus = NT_STATUS_NO_MEMORY;
 795                         goto err_root_exit;
 796                 }
 797
 798                 if (!set_conn_connectpath(conn,s)) {
 799                         TALLOC_FREE(s);
 800                         *pstatus = NT_STATUS_NO_MEMORY;
 801                         goto err_root_exit;
 802                 }
 803                 DEBUG(3,("Connect path is '%s' for service [%s]\n",s,
 804                          lp_servicename(snum)));
 805                 TALLOC_FREE(s);
 806         }
 807
 808         /*
 809          * New code to check if there's a share security descripter
 810          * added from NT server manager. This is done after the
 811          * smb.conf checks are done as we need a uid and token. JRA.
 812          *
 813          */
 814
 815         {
 816                 bool can_write = False;
 817
 818                 can_write = share_access_check(conn->server_info->ptok,
 819                                                lp_servicename(snum),
 820                                                FILE_WRITE_DATA);
 821
 822                 if (!can_write) {
 823                         if (!share_access_check(conn->server_info->ptok,
 824                                                 lp_servicename(snum),
 825                                                 FILE_READ_DATA)) {
 826                                 /* No access, read or write. */
 827                                 DEBUG(0,("make_connection: connection to %s "
 828                                          "denied due to security "
 829                                          "descriptor.\n",
 830                                           lp_servicename(snum)));
 831                                 *pstatus = NT_STATUS_ACCESS_DENIED;
 832                                 goto err_root_exit;
 833                         } else {
 834                                 conn->read_only = True;
 835                         }
 836                 }
 837         }
 838         /* Initialise VFS function pointers */
 839
 840         if (!smbd_vfs_init(conn)) {
 841                 DEBUG(0, ("vfs_init failed for service %s\n",
 842                           lp_servicename(snum)));
 843                 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
 844                 goto err_root_exit;
 845         }
 846
 847 /* ROOT Activities: */
 848         /* explicitly check widelinks here so that we can correctly warn
 849          * in the logs. */
 850         widelinks_warning(snum);
 851
 852         /*
 853          * Enforce the max connections parameter.
 854          */
 855
 856         if ((lp_max_connections(snum) > 0)
 857             && (count_current_connections(lp_servicename(SNUM(conn)), True) >=
 858                 lp_max_connections(snum))) {
 859
 860                 DEBUG(1, ("Max connections (%d) exceeded for %s\n",
 861                           lp_max_connections(snum), lp_servicename(snum)));
 862                 *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
 863                 goto err_root_exit;
 864         }
 865
 866         /*
 867          * Get us an entry in the connections db
 868          */
 869         if (!claim_connection(conn, lp_servicename(snum), 0)) {
 870                 DEBUG(1, ("Could not store connections entry\n"));
 871                 *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
 872                 goto err_root_exit;
 873         }
 874         claimed_connection = true;
 875
 876         /* Invoke VFS make connection hook - this must be the first
 877            filesystem operation that we do. */
 878
 879         if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
 880                             conn->server_info->unix_name) < 0) {
 881                 DEBUG(0,("make_connection: VFS make connection failed!\n"));
 882                 *pstatus = NT_STATUS_UNSUCCESSFUL;
 883                 goto err_root_exit;
 884         }
 885
 886         /* Any error exit after here needs to call the disconnect hook. */
 887         on_err_call_dis_hook = true;
 888
 889         if ((!conn->printer) && (!conn->ipc)) {
 890                 conn->notify_ctx = notify_init(conn, procid_self(),
 891                                                smbd_messaging_context(),
 892                                                smbd_event_context(),
 893                                                conn);
 894         }
 895
 896         /*
 897          * Fix compatibility issue pointed out by Volker.
 898          * We pass the conn->connectpath to the preexec
 899          * scripts as a parameter, so attempt to canonicalize
 900          * it here before calling the preexec scripts.
 901          * We ignore errors here, as it is possible that
 902          * the conn->connectpath doesn't exist yet and
 903          * the preexec scripts will create them.
 904          */
 905
 906         (void)canonicalize_connect_path(conn);
 907
 908         /* Preexecs are done here as they might make the dir we are to ChDir
 909          * to below */
 910         /* execute any "root preexec = " line */
 911         if (*lp_rootpreexec(snum)) {
 912                 char *cmd = talloc_sub_advanced(talloc_tos(),
 913                                         lp_servicename(SNUM(conn)),
 914                                         conn->server_info->unix_name,
 915                                         conn->connectpath,
 916                                         conn->server_info->utok.gid,
 917                                         conn->server_info->sanitized_username,
 918                                         pdb_get_domain(conn->server_info->sam_account),
 919                                         lp_rootpreexec(snum));
 920                 DEBUG(5,("cmd=%s\n",cmd));
 921                 ret = smbrun(cmd,NULL);
 922                 TALLOC_FREE(cmd);
 923                 if (ret != 0 && lp_rootpreexec_close(snum)) {
 924                         DEBUG(1,("root preexec gave %d - failing "
 925                                  "connection\n", ret));
 926                         *pstatus = NT_STATUS_ACCESS_DENIED;
 927                         goto err_root_exit;
 928                 }
 929         }
 930
 931 /* USER Activites: */
 932         if (!change_to_user(conn, conn->vuid)) {
 933                 /* No point continuing if they fail the basic checks */
 934                 DEBUG(0,("Can't become connected user!\n"));
 935                 *pstatus = NT_STATUS_LOGON_FAILURE;
 936                 goto err_root_exit;
 937         }
 938
 939         effuid = geteuid();
 940         effgid = getegid();
 941
 942         /* Remember that a different vuid can connect later without these
 943          * checks... */
 944
 945         /* Preexecs are done here as they might make the dir we are to ChDir
 946          * to below */
 947
 948         /* execute any "preexec = " line */
 949         if (*lp_preexec(snum)) {
 950                 char *cmd = talloc_sub_advanced(talloc_tos(),
 951                                         lp_servicename(SNUM(conn)),
 952                                         conn->server_info->unix_name,
 953                                         conn->connectpath,
 954                                         conn->server_info->utok.gid,
 955                                         conn->server_info->sanitized_username,
 956                                         pdb_get_domain(conn->server_info->sam_account),
 957                                         lp_preexec(snum));
 958                 ret = smbrun(cmd,NULL);
 959                 TALLOC_FREE(cmd);
 960                 if (ret != 0 && lp_preexec_close(snum)) {
 961                         DEBUG(1,("preexec gave %d - failing connection\n",
 962                                  ret));
 963                         *pstatus = NT_STATUS_ACCESS_DENIED;
 964                         goto err_root_exit;
 965                 }
 966         }
 967
 968 #ifdef WITH_FAKE_KASERVER
 969         if (lp_afs_share(snum)) {
 970                 afs_login(conn);
 971         }
 972 #endif
 973
 974         /*
 975          * we've finished with the user stuff - go back to root
 976          * so the SMB_VFS_STAT call will only fail on path errors,
 977          * not permission problems.
 978          */
 979         change_to_root_user();
 980 /* ROOT Activites: */
 981
 982         /*
 983          * If widelinks are disallowed we need to canonicalise the connect
 984          * path here to ensure we don't have any symlinks in the
 985          * connectpath. We will be checking all paths on this connection are
 986          * below this directory. We must do this after the VFS init as we
 987          * depend on the realpath() pointer in the vfs table. JRA.
 988          */
 989         if (!lp_widelinks(snum)) {
 990                 if (!canonicalize_connect_path(conn)) {
 991                         DEBUG(0, ("canonicalize_connect_path failed "
 992                         "for service %s, path %s\n",
 993                                 lp_servicename(snum),
 994                                 conn->connectpath));
 995                         *pstatus = NT_STATUS_BAD_NETWORK_NAME;
 996                         goto err_root_exit;
 997                 }
 998         }
 999
1000         /* Add veto/hide lists */
1001         if (!IS_IPC(conn) && !IS_PRINT(conn)) {
1002                 set_namearray( &conn->veto_list, lp_veto_files(snum));
1003                 set_namearray( &conn->hide_list, lp_hide_files(snum));
1004                 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(snum));
1005                 set_namearray( &conn->aio_write_behind_list,
1006                                 lp_aio_write_behind(snum));
1007         }
1008         status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
1009                                             NULL, NULL, &smb_fname_cpath);
1010         if (!NT_STATUS_IS_OK(status)) {
1011                 *pstatus = status;
1012                 goto err_root_exit;
1013         }
1014
1015         /* win2000 does not check the permissions on the directory
1016            during the tree connect, instead relying on permission
1017            check during individual operations. To match this behaviour
1018            I have disabled this chdir check (tridge) */
1019         /* the alternative is just to check the directory exists */
1020
1021         if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
1022             !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1023                 if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
1024                         DEBUG(0,("'%s' is not a directory, when connecting to "
1025                                  "[%s]\n", conn->connectpath,
1026                                  lp_servicename(snum)));
1027                 } else {
1028                         DEBUG(0,("'%s' does not exist or permission denied "
1029                                  "when connecting to [%s] Error was %s\n",
1030                                  conn->connectpath, lp_servicename(snum),
1031                                  strerror(errno) ));
1032                 }
1033                 *pstatus = NT_STATUS_BAD_NETWORK_NAME;
1034                 goto err_root_exit;
1035         }
1036         conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
1037
1038         string_set(&conn->origpath,conn->connectpath);
1039
1040         /* Figure out the characteristics of the underlying filesystem. This
1041          * assumes that all the filesystem mounted withing a share path have
1042          * the same characteristics, which is likely but not guaranteed.
1043          */
1044
1045         conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
1046
1047         /*
1048          * Print out the 'connected as' stuff here as we need
1049          * to know the effective uid and gid we will be using
1050          * (at least initially).
1051          */
1052
1053         if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
1054                 dbgtext( "%s (%s) ", get_remote_machine_name(),
1055                          conn->client_address );
1056                 dbgtext( "%s", srv_is_signing_active(smbd_server_conn) ? "signed " : "");
1057                 dbgtext( "connect to service %s ", lp_servicename(snum) );
1058                 dbgtext( "initially as user %s ",
1059                          conn->server_info->unix_name );
1060                 dbgtext( "(uid=%d, gid=%d) ", (int)effuid, (int)effgid );
1061                 dbgtext( "(pid %d)\n", (int)sys_getpid() );
1062         }
1063
1064         return(conn);
1065
1066   err_root_exit:
1067         TALLOC_FREE(smb_fname_cpath);
1068         /* We must exit this function as root. */
1069         if (geteuid() != 0) {
1070                 change_to_root_user();
1071         }
1072         if (on_err_call_dis_hook) {
1073                 /* Call VFS disconnect hook */
1074                 SMB_VFS_DISCONNECT(conn);
1075         }
1076         if (claimed_connection) {
1077                 yield_connection(conn, lp_servicename(snum));
1078         }
1079         if (conn) {
1080                 conn_free(conn);
1081         }
1082         return NULL;
1083 }
1084
1085 /****************************************************************************
1086  Make a connection to a service.
1087  *
1088  * @param service
1089 ****************************************************************************/
1090
1091 connection_struct *make_connection(struct smbd_server_connection *sconn,
1092                                    const char *service_in, DATA_BLOB password,
1093                                    const char *pdev, uint16 vuid,
1094                                    NTSTATUS *status)
1095 {
1096         uid_t euid;
1097         user_struct *vuser = NULL;
1098         fstring service;
1099         fstring dev;
1100         int snum = -1;
1101         char addr[INET6_ADDRSTRLEN];
1102
1103         fstrcpy(dev, pdev);
1104
1105         /* This must ONLY BE CALLED AS ROOT. As it exits this function as
1106          * root. */
1107         if (!non_root_mode() && (euid = geteuid()) != 0) {
1108                 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot "
1109                          "(%u)\n", (unsigned int)euid ));
1110                 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
1111         }
1112
1113         if (conn_num_open(sconn) > 2047) {
1114                 *status = NT_STATUS_INSUFF_SERVER_RESOURCES;
1115                 return NULL;
1116         }
1117
1118         if(lp_security() != SEC_SHARE) {
1119                 vuser = get_valid_user_struct(sconn, vuid);
1120                 if (!vuser) {
1121                         DEBUG(1,("make_connection: refusing to connect with "
1122                                  "no session setup\n"));
1123                         *status = NT_STATUS_ACCESS_DENIED;
1124                         return NULL;
1125                 }
1126         }
1127
1128         /* Logic to try and connect to the correct [homes] share, preferably
1129            without too many getpwnam() lookups.  This is particulary nasty for
1130            winbind usernames, where the share name isn't the same as unix
1131            username.
1132
1133            The snum of the homes share is stored on the vuser at session setup
1134            time.
1135         */
1136
1137         if (strequal(service_in,HOMES_NAME)) {
1138                 if(lp_security() != SEC_SHARE) {
1139                         DATA_BLOB no_pw = data_blob_null;
1140                         if (vuser->homes_snum == -1) {
1141                                 DEBUG(2, ("[homes] share not available for "
1142                                           "this user because it was not found "
1143                                           "or created at session setup "
1144                                           "time\n"));
1145                                 *status = NT_STATUS_BAD_NETWORK_NAME;
1146                                 return NULL;
1147                         }
1148                         DEBUG(5, ("making a connection to [homes] service "
1149                                   "created at session setup time\n"));
1150                         return make_connection_snum(sconn,
1151                                                     vuser->homes_snum,
1152                                                     vuser, no_pw,
1153                                                     dev, status);
1154                 } else {
1155                         /* Security = share. Try with
1156                          * current_user_info.smb_name as the username.  */
1157                         if (*current_user_info.smb_name) {
1158                                 fstring unix_username;
1159                                 fstrcpy(unix_username,
1160                                         current_user_info.smb_name);
1161                                 map_username(sconn, unix_username);
1162                                 snum = find_service(unix_username);
1163                         }
1164                         if (snum != -1) {
1165                                 DEBUG(5, ("making a connection to 'homes' "
1166                                           "service %s based on "
1167                                           "security=share\n", service_in));
1168                                 return make_connection_snum(sconn,
1169                                                             snum, NULL,
1170                                                             password,
1171                                                             dev, status);
1172                         }
1173                 }
1174         } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
1175                    && strequal(service_in,
1176                                lp_servicename(vuser->homes_snum))) {
1177                 DATA_BLOB no_pw = data_blob_null;
1178                 DEBUG(5, ("making a connection to 'homes' service [%s] "
1179                           "created at session setup time\n", service_in));
1180                 return make_connection_snum(sconn,
1181                                             vuser->homes_snum,
1182                                             vuser, no_pw,
1183                                             dev, status);
1184         }
1185
1186         fstrcpy(service, service_in);
1187
1188         strlower_m(service);
1189
1190         snum = find_service(service);
1191
1192         if (snum < 0) {
1193                 if (strequal(service,"IPC$") ||
1194                     (lp_enable_asu_support() && strequal(service,"ADMIN$"))) {
1195                         DEBUG(3,("refusing IPC connection to %s\n", service));
1196                         *status = NT_STATUS_ACCESS_DENIED;
1197                         return NULL;
1198                 }
1199
1200                 DEBUG(3,("%s (%s) couldn't find service %s\n",
1201                         get_remote_machine_name(),
1202                         client_addr(get_client_fd(),addr,sizeof(addr)),
1203                         service));
1204                 *status = NT_STATUS_BAD_NETWORK_NAME;
1205                 return NULL;
1206         }
1207
1208         /* Handle non-Dfs clients attempting connections to msdfs proxy */
1209         if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0'))  {
1210                 DEBUG(3, ("refusing connection to dfs proxy share '%s' "
1211                           "(pointing to %s)\n",
1212                         service, lp_msdfs_proxy(snum)));
1213                 *status = NT_STATUS_BAD_NETWORK_NAME;
1214                 return NULL;
1215         }
1216
1217         DEBUG(5, ("making a connection to 'normal' service %s\n", service));
1218
1219         return make_connection_snum(sconn, snum, vuser,
1220                                     password,
1221                                     dev, status);
1222 }
1223
1224 /****************************************************************************
1225  Close a cnum.
1226 ****************************************************************************/
1227
1228 void close_cnum(connection_struct *conn, uint16 vuid)
1229 {
1230         file_close_conn(conn);
1231
1232         if (!IS_IPC(conn)) {
1233                 dptr_closecnum(conn);
1234         }
1235
1236         change_to_root_user();
1237
1238         DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
1239                                  get_remote_machine_name(),
1240                                  conn->client_address,
1241                                  lp_servicename(SNUM(conn))));
1242
1243         /* Call VFS disconnect hook */
1244         SMB_VFS_DISCONNECT(conn);
1245
1246         yield_connection(conn, lp_servicename(SNUM(conn)));
1247
1248         /* make sure we leave the directory available for unmount */
1249         vfs_ChDir(conn, "/");
1250
1251         /* execute any "postexec = " line */
1252         if (*lp_postexec(SNUM(conn)) &&
1253             change_to_user(conn, vuid))  {
1254                 char *cmd = talloc_sub_advanced(talloc_tos(),
1255                                         lp_servicename(SNUM(conn)),
1256                                         conn->server_info->unix_name,
1257                                         conn->connectpath,
1258                                         conn->server_info->utok.gid,
1259                                         conn->server_info->sanitized_username,
1260                                         pdb_get_domain(conn->server_info->sam_account),
1261                                         lp_postexec(SNUM(conn)));
1262                 smbrun(cmd,NULL);
1263                 TALLOC_FREE(cmd);
1264                 change_to_root_user();
1265         }
1266
1267         change_to_root_user();
1268         /* execute any "root postexec = " line */
1269         if (*lp_rootpostexec(SNUM(conn)))  {
1270                 char *cmd = talloc_sub_advanced(talloc_tos(),
1271                                         lp_servicename(SNUM(conn)),
1272                                         conn->server_info->unix_name,
1273                                         conn->connectpath,
1274                                         conn->server_info->utok.gid,
1275                                         conn->server_info->sanitized_username,
1276                                         pdb_get_domain(conn->server_info->sam_account),
1277                                         lp_rootpostexec(SNUM(conn)));
1278                 smbrun(cmd,NULL);
1279                 TALLOC_FREE(cmd);
1280         }
1281
1282         conn_free(conn);
1283 }