source/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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 extern struct timeval smb_last_time;
  24 extern int case_default;
  25 extern BOOL case_preserve;
  26 extern BOOL short_case_preserve;
  27 extern BOOL case_mangle;
  28 extern BOOL case_sensitive;
  29 extern BOOL use_mangled_map;
  30 extern userdom_struct current_user_info;
  31
  32
  33 /****************************************************************************
  34  Load parameters specific to a connection/service.
  35 ****************************************************************************/
  36
  37 BOOL set_current_service(connection_struct *conn,BOOL do_chdir)
  38 {
  39         extern char magic_char;
  40         static connection_struct *last_conn;
  41         int snum;
  42
  43         if (!conn)  {
  44                 last_conn = NULL;
  45                 return(False);
  46         }
  47
  48         conn->lastused = smb_last_time.tv_sec;
  49
  50         snum = SNUM(conn);
  51
  52         if (do_chdir &&
  53             vfs_ChDir(conn,conn->connectpath) != 0 &&
  54             vfs_ChDir(conn,conn->origpath) != 0) {
  55                 DEBUG(0,("chdir (%s) failed\n",
  56                          conn->connectpath));
  57                 return(False);
  58         }
  59
  60         if (conn == last_conn)
  61                 return(True);
  62
  63         last_conn = conn;
  64
  65         case_default = lp_defaultcase(snum);
  66         case_preserve = lp_preservecase(snum);
  67         short_case_preserve = lp_shortpreservecase(snum);
  68         case_mangle = lp_casemangle(snum);
  69         case_sensitive = lp_casesensitive(snum);
  70         magic_char = lp_magicchar(snum);
  71         use_mangled_map = (*lp_mangled_map(snum) ? True:False);
  72         return(True);
  73 }
  74
  75 /****************************************************************************
  76  Add a home service. Returns the new service number or -1 if fail.
  77 ****************************************************************************/
  78
  79 int add_home_service(const char *service, const char *username, const char *homedir)
  80 {
  81         int iHomeService;
  82
  83         if (!service || !homedir)
  84                 return -1;
  85
  86         if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0)
  87                 return -1;
  88
  89         /*
  90          * If this is a winbindd provided username, remove
  91          * the domain component before adding the service.
  92          * Log a warning if the "path=" parameter does not
  93          * include any macros.
  94          */
  95
  96         {
  97                 const char *p = strchr(service,*lp_winbind_separator());
  98
  99                 /* We only want the 'user' part of the string */
 100                 if (p) {
 101                         service = p + 1;
 102                 }
 103         }
 104
 105         if (!lp_add_home(service, iHomeService, username, homedir)) {
 106                 return -1;
 107         }
 108
 109         return lp_servicenumber(service);
 110
 111 }
 112
 113
 114 /**
 115  * Find a service entry. service is always in dos codepage.
 116  *
 117  * @param service is modified (to canonical form??)
 118  **/
 119 int find_service(fstring service)
 120 {
 121    int iService;
 122
 123    all_string_sub(service,"\\","/",0);
 124
 125    iService = lp_servicenumber(service);
 126
 127    /* now handle the special case of a home directory */
 128    if (iService < 0)
 129    {
 130       char *phome_dir = get_user_home_dir(service);
 131
 132       if(!phome_dir)
 133       {
 134         /*
 135          * Try mapping the servicename, it may
 136          * be a Windows to unix mapped user name.
 137          */
 138         if(map_username(service))
 139           phome_dir = get_user_home_dir(service);
 140       }
 141
 142       DEBUG(3,("checking for home directory %s gave %s\n",service,
 143             phome_dir?phome_dir:"(NULL)"));
 144
 145       iService = add_home_service(service,service /* 'username' */, phome_dir);
 146    }
 147
 148    /* If we still don't have a service, attempt to add it as a printer. */
 149    if (iService < 0)
 150    {
 151       int iPrinterService;
 152
 153       if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) >= 0)
 154       {
 155          char *pszTemp;
 156
 157          DEBUG(3,("checking whether %s is a valid printer name...\n", service));
 158          pszTemp = lp_printcapname();
 159          if ((pszTemp != NULL) && pcap_printername_ok(service, pszTemp))
 160          {
 161             DEBUG(3,("%s is a valid printer name\n", service));
 162             DEBUG(3,("adding %s as a printer service\n", service));
 163             lp_add_printer(service, iPrinterService);
 164             iService = lp_servicenumber(service);
 165             if (iService < 0)
 166                DEBUG(0,("failed to add %s as a printer service!\n", service));
 167          }
 168          else
 169             DEBUG(3,("%s is not a valid printer name\n", service));
 170       }
 171    }
 172
 173    /* Check for default vfs service?  Unsure whether to implement this */
 174    if (iService < 0)
 175    {
 176    }
 177
 178    /* just possibly it's a default service? */
 179    if (iService < 0)
 180    {
 181      char *pdefservice = lp_defaultservice();
 182      if (pdefservice && *pdefservice &&
 183          !strequal(pdefservice,service) &&
 184          !strstr(service,".."))
 185      {
 186        /*
 187         * We need to do a local copy here as lp_defaultservice()
 188         * returns one of the rotating lp_string buffers that
 189         * could get overwritten by the recursive find_service() call
 190         * below. Fix from Josef Hinteregger <joehtg@joehtg.co.at>.
 191         */
 192        pstring defservice;
 193        pstrcpy(defservice, pdefservice);
 194        iService = find_service(defservice);
 195        if (iService >= 0)
 196        {
 197          all_string_sub(service, "_","/",0);
 198          iService = lp_add_service(service, iService);
 199        }
 200      }
 201    }
 202
 203    if (iService >= 0)
 204      if (!VALID_SNUM(iService))
 205      {
 206        DEBUG(0,("Invalid snum %d for %s\n",iService, service));
 207        iService = -1;
 208      }
 209
 210    if (iService < 0)
 211      DEBUG(3,("find_service() failed to find service %s\n", service));
 212
 213    return (iService);
 214 }
 215
 216
 217 /****************************************************************************
 218  do some basic sainity checks on the share.
 219  This function modifies dev, ecode.
 220 ****************************************************************************/
 221 static NTSTATUS share_sanity_checks(int snum, fstring dev)
 222 {
 223
 224         if (!lp_snum_ok(snum) ||
 225             !check_access(smbd_server_fd(),
 226                           lp_hostsallow(snum), lp_hostsdeny(snum))) {
 227                 return NT_STATUS_ACCESS_DENIED;
 228         }
 229
 230         if (dev[0] == '?' || !dev[0]) {
 231                 if (lp_print_ok(snum)) {
 232                         fstrcpy(dev,"LPT1:");
 233                 } else if (strequal(lp_fstype(snum), "IPC")) {
 234                         fstrcpy(dev, "IPC");
 235                 } else {
 236                         fstrcpy(dev,"A:");
 237                 }
 238         }
 239
 240         strupper(dev);
 241
 242         if (lp_print_ok(snum)) {
 243                 if (!strequal(dev, "LPT1:")) {
 244                         return NT_STATUS_BAD_DEVICE_TYPE;
 245                 }
 246         } else if (strequal(lp_fstype(snum), "IPC")) {
 247                 if (!strequal(dev, "IPC")) {
 248                         return NT_STATUS_BAD_DEVICE_TYPE;
 249                 }
 250         } else if (!strequal(dev, "A:")) {
 251                 return NT_STATUS_BAD_DEVICE_TYPE;
 252         }
 253
 254         /* Behave as a printer if we are supposed to */
 255         if (lp_print_ok(snum) && (strcmp(dev, "A:") == 0)) {
 256                 fstrcpy(dev, "LPT1:");
 257         }
 258
 259         return NT_STATUS_OK;
 260 }
 261
 262
 263 /****************************************************************************
 264  readonly share?
 265 ****************************************************************************/
 266 static void set_read_only(connection_struct *conn, gid_t *groups, size_t n_groups)
 267 {
 268         char **list;
 269         char *service = lp_servicename(conn->service);
 270         conn->read_only = lp_readonly(conn->service);
 271
 272         if (!service) return;
 273
 274         str_list_copy(&list, lp_readlist(conn->service));
 275         if (list) {
 276                 if (!str_list_substitute(list, "%S", service)) {
 277                         DEBUG(0, ("ERROR: read list substitution failed\n"));
 278                 }
 279                 if (user_in_list(conn->user, (const char **)list, groups, n_groups))
 280                         conn->read_only = True;
 281                 str_list_free(&list);
 282         }
 283
 284         str_list_copy(&list, lp_writelist(conn->service));
 285         if (list) {
 286                 if (!str_list_substitute(list, "%S", service)) {
 287                         DEBUG(0, ("ERROR: write list substitution failed\n"));
 288                 }
 289                 if (user_in_list(conn->user, (const char **)list, groups, n_groups))
 290                         conn->read_only = False;
 291                 str_list_free(&list);
 292         }
 293 }
 294
 295
 296 /****************************************************************************
 297   admin user check
 298 ****************************************************************************/
 299 static void set_admin_user(connection_struct *conn, gid_t *groups, size_t n_groups)
 300 {
 301         /* admin user check */
 302
 303         /* JRA - original code denied admin user if the share was
 304            marked read_only. Changed as I don't think this is needed,
 305            but old code left in case there is a problem here.
 306         */
 307         if (user_in_list(conn->user,lp_admin_users(conn->service), groups, n_groups)
 308 #if 0
 309             && !conn->read_only
 310 #endif
 311             ) {
 312                 conn->admin_user = True;
 313                 conn->force_user = True;  /* Admin users are effectivly 'forced' */
 314                 DEBUG(0,("%s logged in as admin user (root privileges)\n",conn->user));
 315         } else {
 316                 conn->admin_user = False;
 317         }
 318
 319 #if 0 /* This done later, for now */
 320         /* admin users always run as uid=0 */
 321         if (conn->admin_user) {
 322                 conn->uid = 0;
 323         }
 324 #endif
 325 }
 326
 327 /****************************************************************************
 328   Make a connection, given the snum to connect to, and the vuser of the
 329   connecting user if appropriate.
 330 ****************************************************************************/
 331
 332 static connection_struct *make_connection_snum(int snum, user_struct *vuser,
 333                                                DATA_BLOB password,
 334                                                const char *pdev, NTSTATUS *status)
 335 {
 336         struct passwd *pass = NULL;
 337         BOOL guest = False;
 338         connection_struct *conn;
 339         struct stat st;
 340         fstring user;
 341         fstring dev;
 342
 343         *user = 0;
 344         fstrcpy(dev, pdev);
 345
 346         if (NT_STATUS_IS_ERR(*status = share_sanity_checks(snum, dev))) {
 347                 return NULL;
 348         }
 349
 350         conn = conn_new();
 351         if (!conn) {
 352                 DEBUG(0,("Couldn't find free connection.\n"));
 353                 *status = NT_STATUS_INSUFFICIENT_RESOURCES;
 354                 return NULL;
 355         }
 356
 357         if (lp_guest_only(snum)) {
 358                 const char *guestname = lp_guestaccount();
 359                 guest = True;
 360                 pass = getpwnam_alloc(guestname);
 361                 if (!pass) {
 362                         DEBUG(0,("authorise_login: Invalid guest account %s??\n",guestname));
 363                         conn_free(conn);
 364                         *status = NT_STATUS_NO_SUCH_USER;
 365                         return NULL;
 366                 }
 367                 fstrcpy(user,pass->pw_name);
 368                 conn->force_user = True;
 369                 string_set(&conn->user,pass->pw_name);
 370                 passwd_free(&pass);
 371                 DEBUG(3,("Guest only user %s\n",user));
 372         } else if (vuser) {
 373                 if (vuser->guest) {
 374                         if (!lp_guest_ok(snum)) {
 375                                 DEBUG(2, ("guest user (from session setup) not permitted to access this share (%s)\n", lp_servicename(snum)));
 376                                       conn_free(conn);
 377                                       *status = NT_STATUS_ACCESS_DENIED;
 378                                       return NULL;
 379                         }
 380                 } else {
 381                         if (!user_ok(vuser->user.unix_name, snum, vuser->groups, vuser->n_groups)) {
 382                                 DEBUG(2, ("user '%s' (from session setup) not permitted to access this share (%s)\n", vuser->user.unix_name, lp_servicename(snum)));
 383                                 conn_free(conn);
 384                                 *status = NT_STATUS_ACCESS_DENIED;
 385                                 return NULL;
 386                         }
 387                 }
 388                 conn->vuid = vuser->vuid;
 389                 conn->uid = vuser->uid;
 390                 conn->gid = vuser->gid;
 391                 string_set(&conn->user,vuser->user.unix_name);
 392                 fstrcpy(user,vuser->user.unix_name);
 393                 guest = vuser->guest;
 394         } else if (lp_security() == SEC_SHARE) {
 395                 /* add it as a possible user name if we
 396                    are in share mode security */
 397                 add_session_user(lp_servicename(snum));
 398                 /* shall we let them in? */
 399                 if (!authorise_login(snum,user,password,&guest)) {
 400                         DEBUG( 2, ( "Invalid username/password for [%s]\n",
 401                                     lp_servicename(snum)) );
 402                         conn_free(conn);
 403                         *status = NT_STATUS_WRONG_PASSWORD;
 404                         return NULL;
 405                 }
 406                 pass = Get_Pwnam(user);
 407                 conn->force_user = True;
 408                 conn->uid = pass->pw_uid;
 409                 conn->gid = pass->pw_gid;
 410                 string_set(&conn->user, pass->pw_name);
 411                 fstrcpy(user, pass->pw_name);
 412
 413         } else {
 414                 DEBUG(0, ("invalid VUID (vuser) but not in security=share\n"));
 415                 conn_free(conn);
 416                 *status = NT_STATUS_ACCESS_DENIED;
 417                 return NULL;
 418         }
 419
 420         add_session_user(user);
 421
 422         safe_strcpy(conn->client_address, client_addr(),
 423                     sizeof(conn->client_address)-1);
 424         conn->num_files_open = 0;
 425         conn->lastused = time(NULL);
 426         conn->service = snum;
 427         conn->used = True;
 428         conn->printer = (strncmp(dev,"LPT",3) == 0);
 429         conn->ipc = ((strncmp(dev,"IPC",3) == 0) || strequal(dev,"ADMIN$"));
 430         conn->dirptr = NULL;
 431         conn->veto_list = NULL;
 432         conn->hide_list = NULL;
 433         conn->veto_oplock_list = NULL;
 434         string_set(&conn->dirpath,"");
 435         string_set(&conn->user,user);
 436         conn->nt_user_token = NULL;
 437
 438         set_read_only(conn, vuser ? vuser->groups : NULL, vuser ? vuser->n_groups : 0);
 439
 440         set_admin_user(conn, vuser ? vuser->groups : NULL, vuser ? vuser->n_groups : 0);
 441
 442         /*
 443          * If force user is true, then store the
 444          * given userid and also the groups
 445          * of the user we're forcing.
 446          */
 447
 448         if (*lp_force_user(snum)) {
 449                 struct passwd *pass2;
 450                 pstring fuser;
 451                 pstrcpy(fuser,lp_force_user(snum));
 452
 453                 /* Allow %S to be used by force user. */
 454                 pstring_sub(fuser,"%S",lp_servicename(snum));
 455
 456                 pass2 = (struct passwd *)Get_Pwnam(fuser);
 457                 if (pass2) {
 458                         conn->uid = pass2->pw_uid;
 459                         conn->gid = pass2->pw_gid;
 460                         string_set(&conn->user,pass2->pw_name);
 461                         fstrcpy(user,pass2->pw_name);
 462                         conn->force_user = True;
 463                         DEBUG(3,("Forced user %s\n",user));
 464                 } else {
 465                         DEBUG(1,("Couldn't find user %s\n",fuser));
 466                         conn_free(conn);
 467                         *status = NT_STATUS_NO_SUCH_USER;
 468                         return NULL;
 469                 }
 470         }
 471
 472         /* admin users always run as uid=0 */
 473         if (conn->admin_user) {
 474                 conn->uid = 0;
 475         }
 476
 477 #ifdef HAVE_GETGRNAM
 478         /*
 479          * If force group is true, then override
 480          * any groupid stored for the connecting user.
 481          */
 482
 483         if (*lp_force_group(snum)) {
 484                 gid_t gid;
 485                 pstring gname;
 486                 pstring tmp_gname;
 487                 BOOL user_must_be_member = False;
 488
 489                 pstrcpy(tmp_gname,lp_force_group(snum));
 490
 491                 if (tmp_gname[0] == '+') {
 492                         user_must_be_member = True;
 493                         /* even now, tmp_gname is null terminated */
 494                         pstrcpy(gname,&tmp_gname[1]);
 495                 } else {
 496                         pstrcpy(gname,tmp_gname);
 497                 }
 498                 /* default service may be a group name          */
 499                 pstring_sub(gname,"%S",lp_servicename(snum));
 500                 gid = nametogid(gname);
 501
 502                 if (gid != (gid_t)-1) {
 503
 504                         /*
 505                          * If the user has been forced and the forced group starts
 506                          * with a '+', then we only set the group to be the forced
 507                          * group if the forced user is a member of that group.
 508                          * Otherwise, the meaning of the '+' would be ignored.
 509                          */
 510                         if (conn->force_user && user_must_be_member) {
 511                                 if (user_in_group_list( user, gname, NULL, 0)) {
 512                                                 conn->gid = gid;
 513                                                 DEBUG(3,("Forced group %s for member %s\n",gname,user));
 514                                 }
 515                         } else {
 516                                 conn->gid = gid;
 517                                 DEBUG(3,("Forced group %s\n",gname));
 518                         }
 519                         conn->force_group = True;
 520                 } else {
 521                         DEBUG(1,("Couldn't find group %s\n",gname));
 522                         conn_free(conn);
 523                         *status = NT_STATUS_NO_SUCH_GROUP;
 524                         return NULL;
 525                 }
 526         }
 527 #endif /* HAVE_GETGRNAM */
 528
 529         {
 530                 pstring s;
 531                 pstrcpy(s,lp_pathname(snum));
 532                 standard_sub_conn(conn,s,sizeof(s));
 533                 string_set(&conn->connectpath,s);
 534                 DEBUG(3,("Connect path is '%s' for service [%s]\n",s, lp_servicename(snum)));
 535         }
 536
 537         if (conn->force_user || conn->force_group) {
 538
 539                 /* groups stuff added by ih */
 540                 conn->ngroups = 0;
 541                 conn->groups = NULL;
 542
 543                 /* Find all the groups this uid is in and
 544                    store them. Used by change_to_user() */
 545                 initialise_groups(conn->user, conn->uid, conn->gid);
 546                 get_current_groups(conn->gid, &conn->ngroups,&conn->groups);
 547
 548                 conn->nt_user_token = create_nt_token(conn->uid, conn->gid,
 549                                                       conn->ngroups, conn->groups,
 550                                                       guest);
 551         }
 552
 553         /*
 554          * New code to check if there's a share security descripter
 555          * added from NT server manager. This is done after the
 556          * smb.conf checks are done as we need a uid and token. JRA.
 557          *
 558          */
 559
 560         {
 561                 BOOL can_write = share_access_check(conn, snum, vuser, FILE_WRITE_DATA);
 562
 563                 if (!can_write) {
 564                         if (!share_access_check(conn, snum, vuser, FILE_READ_DATA)) {
 565                                 /* No access, read or write. */
 566                                 DEBUG(0,( "make_connection: connection to %s denied due to security descriptor.\n",
 567                                           lp_servicename(snum)));
 568                                 conn_free(conn);
 569                                 *status = NT_STATUS_ACCESS_DENIED;
 570                                 return NULL;
 571                         } else {
 572                                 conn->read_only = True;
 573                         }
 574                 }
 575         }
 576         /* Initialise VFS function pointers */
 577
 578         if (!smbd_vfs_init(conn)) {
 579                 DEBUG(0, ("vfs_init failed for service %s\n", lp_servicename(SNUM(conn))));
 580                 conn_free(conn);
 581                 *status = NT_STATUS_BAD_NETWORK_NAME;
 582                 return NULL;
 583         }
 584
 585 /* ROOT Activities: */
 586         /* check number of connections */
 587         if (!claim_connection(conn,
 588                               lp_servicename(SNUM(conn)),
 589                               lp_max_connections(SNUM(conn)),
 590                               False,0)) {
 591                 DEBUG(1,("too many connections - rejected\n"));
 592                 conn_free(conn);
 593                 *status = NT_STATUS_INSUFFICIENT_RESOURCES;
 594                 return NULL;
 595         }
 596
 597         /* Preexecs are done here as they might make the dir we are to ChDir to below */
 598         /* execute any "root preexec = " line */
 599         if (*lp_rootpreexec(SNUM(conn))) {
 600                 int ret;
 601                 pstring cmd;
 602                 pstrcpy(cmd,lp_rootpreexec(SNUM(conn)));
 603                 standard_sub_conn(conn,cmd,sizeof(cmd));
 604                 DEBUG(5,("cmd=%s\n",cmd));
 605                 ret = smbrun(cmd,NULL);
 606                 if (ret != 0 && lp_rootpreexec_close(SNUM(conn))) {
 607                         DEBUG(1,("root preexec gave %d - failing connection\n", ret));
 608                         yield_connection(conn, lp_servicename(SNUM(conn)));
 609                         conn_free(conn);
 610                         *status = NT_STATUS_ACCESS_DENIED;
 611                         return NULL;
 612                 }
 613         }
 614
 615 /* USER Activites: */
 616         if (!change_to_user(conn, conn->vuid)) {
 617                 /* No point continuing if they fail the basic checks */
 618                 DEBUG(0,("Can't become connected user!\n"));
 619                 conn_free(conn);
 620                 *status = NT_STATUS_LOGON_FAILURE;
 621                 return NULL;
 622         }
 623
 624         /* Remember that a different vuid can connect later without these checks... */
 625
 626         /* Preexecs are done here as they might make the dir we are to ChDir to below */
 627         /* execute any "preexec = " line */
 628         if (*lp_preexec(SNUM(conn))) {
 629                 int ret;
 630                 pstring cmd;
 631                 pstrcpy(cmd,lp_preexec(SNUM(conn)));
 632                 standard_sub_conn(conn,cmd,sizeof(cmd));
 633                 ret = smbrun(cmd,NULL);
 634                 if (ret != 0 && lp_preexec_close(SNUM(conn))) {
 635                         DEBUG(1,("preexec gave %d - failing connection\n", ret));
 636                         change_to_root_user();
 637                         yield_connection(conn, lp_servicename(SNUM(conn)));
 638                         conn_free(conn);
 639                         *status = NT_STATUS_ACCESS_DENIED;
 640                         return NULL;
 641                 }
 642         }
 643
 644 #if CHECK_PATH_ON_TCONX
 645         /* win2000 does not check the permissions on the directory
 646            during the tree connect, instead relying on permission
 647            check during individual operations. To match this behaviour
 648            I have disabled this chdir check (tridge) */
 649         if (vfs_ChDir(conn,conn->connectpath) != 0) {
 650                 DEBUG(0,("%s (%s) Can't change directory to %s (%s)\n",
 651                          get_remote_machine_name(), conn->client_address,
 652                          conn->connectpath,strerror(errno)));
 653                 change_to_root_user();
 654                 yield_connection(conn, lp_servicename(SNUM(conn)));
 655                 conn_free(conn);
 656                 *status = NT_STATUS_BAD_NETWORK_NAME;
 657                 return NULL;
 658         }
 659 #else
 660         /* the alternative is just to check the directory exists */
 661         if (stat(conn->connectpath, &st) != 0 || !S_ISDIR(st.st_mode)) {
 662                 DEBUG(0,("'%s' is not a directory, when connecting to [%s]\n", conn->connectpath, lp_servicename(SNUM(conn))));
 663                 change_to_root_user();
 664                 yield_connection(conn, lp_servicename(SNUM(conn)));
 665                 conn_free(conn);
 666                 *status = NT_STATUS_BAD_NETWORK_NAME;
 667                 return NULL;
 668         }
 669 #endif
 670
 671         string_set(&conn->origpath,conn->connectpath);
 672
 673 #if SOFTLINK_OPTIMISATION
 674         /* resolve any soft links early if possible */
 675         if (vfs_ChDir(conn,conn->connectpath) == 0) {
 676                 pstring s;
 677                 pstrcpy(s,conn->connectpath);
 678                 vfs_GetWd(conn,s);
 679                 string_set(&conn->connectpath,s);
 680                 vfs_ChDir(conn,conn->connectpath);
 681         }
 682 #endif
 683
 684         /*
 685          * Print out the 'connected as' stuff here as we need
 686          * to know the effective uid and gid we will be using
 687          * (at least initially).
 688          */
 689
 690         if( DEBUGLVL( IS_IPC(conn) ? 3 : 1 ) ) {
 691                 dbgtext( "%s (%s) ", get_remote_machine_name(), conn->client_address );
 692                 dbgtext( "connect to service %s ", lp_servicename(SNUM(conn)) );
 693                 dbgtext( "initially as user %s ", user );
 694                 dbgtext( "(uid=%d, gid=%d) ", (int)geteuid(), (int)getegid() );
 695                 dbgtext( "(pid %d)\n", (int)sys_getpid() );
 696         }
 697
 698         /* Add veto/hide lists */
 699         if (!IS_IPC(conn) && !IS_PRINT(conn)) {
 700                 set_namearray( &conn->veto_list, lp_veto_files(SNUM(conn)));
 701                 set_namearray( &conn->hide_list, lp_hide_files(SNUM(conn)));
 702                 set_namearray( &conn->veto_oplock_list, lp_veto_oplocks(SNUM(conn)));
 703         }
 704
 705         /* Invoke VFS make connection hook */
 706
 707         if (VFS_CONNECT(conn, lp_servicename(snum), user) < 0) {
 708                 DEBUG(0,("make_connection: VFS make connection failed!\n"));
 709                 change_to_root_user();
 710                 conn_free(conn);
 711                 *status = NT_STATUS_UNSUCCESSFUL;
 712                 return NULL;
 713         }
 714
 715         /* we've finished with the user stuff - go back to root */
 716         change_to_root_user();
 717
 718         return(conn);
 719 }
 720
 721 /***************************************************************************************
 722  Simple wrapper function for make_connection() to include a call to
 723  vfs_chdir()
 724  **************************************************************************************/
 725
 726 connection_struct *make_connection_with_chdir(const char *service_in, DATA_BLOB password,
 727                                    const char *dev, uint16 vuid, NTSTATUS *status)
 728 {
 729         connection_struct *conn = NULL;
 730
 731         conn = make_connection(service_in, password, dev, vuid, status);
 732
 733         /*
 734          * make_connection() does not change the directory for us any more
 735          * so we have to do it as a separate step  --jerry
 736          */
 737
 738         if ( conn && vfs_ChDir(conn,conn->connectpath) != 0 ) {
 739                 DEBUG(0,("move_driver_to_download_area: Can't change directory to %s for [print$] (%s)\n",
 740                          conn->connectpath,strerror(errno)));
 741                 yield_connection(conn, lp_servicename(SNUM(conn)));
 742                 conn_free(conn);
 743                 *status = NT_STATUS_UNSUCCESSFUL;
 744                 return NULL;
 745         }
 746
 747         return conn;
 748 }
 749
 750 /****************************************************************************
 751  Make a connection to a service.
 752  *
 753  * @param service
 754 ****************************************************************************/
 755
 756 connection_struct *make_connection(const char *service_in, DATA_BLOB password,
 757                                    const char *pdev, uint16 vuid, NTSTATUS *status)
 758 {
 759         uid_t euid;
 760         user_struct *vuser = NULL;
 761         fstring service;
 762         fstring dev;
 763         int snum = -1;
 764
 765         fstrcpy(dev, pdev);
 766
 767         /* This must ONLY BE CALLED AS ROOT. As it exits this function as root. */
 768         if (!non_root_mode() && (euid = geteuid()) != 0) {
 769                 DEBUG(0,("make_connection: PANIC ERROR. Called as nonroot (%u)\n", (unsigned int)euid ));
 770                 smb_panic("make_connection: PANIC ERROR. Called as nonroot\n");
 771         }
 772
 773         if(lp_security() != SEC_SHARE) {
 774                 vuser = get_valid_user_struct(vuid);
 775                 if (!vuser) {
 776                         DEBUG(1,("make_connection: refusing to connect with no session setup\n"));
 777                         *status = NT_STATUS_ACCESS_DENIED;
 778                         return NULL;
 779                 }
 780         }
 781
 782         /* Logic to try and connect to the correct [homes] share, preferably without too many
 783            getpwnam() lookups.  This is particulary nasty for winbind usernames, where the
 784            share name isn't the same as unix username.
 785
 786            The snum of the homes share is stored on the vuser at session setup time.
 787         */
 788
 789         if (strequal(service_in,HOMES_NAME)) {
 790                 if(lp_security() != SEC_SHARE) {
 791                         DATA_BLOB no_pw = data_blob(NULL, 0);
 792                         if (vuser->homes_snum == -1) {
 793                                 DEBUG(2, ("[homes] share not available for this user becouse it was not found or created at session setup time\n"));
 794                                 *status = NT_STATUS_BAD_NETWORK_NAME;
 795                                 return NULL;
 796                         }
 797                         DEBUG(5, ("making a connection to [homes] service created at session setup time\n"));
 798                         return make_connection_snum(vuser->homes_snum,
 799                                                     vuser, no_pw,
 800                                                     dev, status);
 801                 } else {
 802                         /* Security = share. Try with current_user_info.smb_name
 803                          * as the username.  */
 804                         if (*current_user_info.smb_name) {
 805                                 fstring unix_username;
 806                                 fstrcpy(unix_username,
 807                                         current_user_info.smb_name);
 808                                 map_username(unix_username);
 809                                 snum = find_service(unix_username);
 810                         }
 811                         if (snum != -1) {
 812                                 DEBUG(5, ("making a connection to 'homes' service %s based on security=share\n", service_in));
 813                                 return make_connection_snum(snum, NULL,
 814                                                             password,
 815                                                             dev, status);
 816                         }
 817                 }
 818         } else if ((lp_security() != SEC_SHARE) && (vuser->homes_snum != -1)
 819                    && strequal(service_in, lp_servicename(vuser->homes_snum))) {
 820                 DATA_BLOB no_pw = data_blob(NULL, 0);
 821                 DEBUG(5, ("making a connection to 'homes' service [%s] created at session setup time\n", service_in));
 822                 return make_connection_snum(vuser->homes_snum,
 823                                             vuser, no_pw,
 824                                             dev, status);
 825         }
 826
 827         fstrcpy(service, service_in);
 828
 829         strlower(service);
 830
 831         snum = find_service(service);
 832
 833         if (snum < 0) {
 834                 if (strequal(service,"IPC$") || strequal(service,"ADMIN$")) {
 835                         DEBUG(3,("refusing IPC connection to %s\n", service));
 836                         *status = NT_STATUS_ACCESS_DENIED;
 837                         return NULL;
 838                 }
 839
 840                 DEBUG(0,("%s (%s) couldn't find service %s\n",
 841                          get_remote_machine_name(), client_addr(), service));
 842                 *status = NT_STATUS_BAD_NETWORK_NAME;
 843                 return NULL;
 844         }
 845
 846         /* Handle non-Dfs clients attempting connections to msdfs proxy */
 847         if (lp_host_msdfs() && (*lp_msdfs_proxy(snum) != '\0'))  {
 848                 DEBUG(3, ("refusing connection to dfs proxy '%s'\n", service));
 849                 *status = NT_STATUS_BAD_NETWORK_NAME;
 850                 return NULL;
 851         }
 852
 853         DEBUG(5, ("making a connection to 'normal' service %s\n", service));
 854
 855         return make_connection_snum(snum, vuser,
 856                                     password,
 857                                     dev, status);
 858 }
 859
 860 /****************************************************************************
 861 close a cnum
 862 ****************************************************************************/
 863 void close_cnum(connection_struct *conn, uint16 vuid)
 864 {
 865         DirCacheFlush(SNUM(conn));
 866
 867         change_to_root_user();
 868
 869         DEBUG(IS_IPC(conn)?3:1, ("%s (%s) closed connection to service %s\n",
 870                                  get_remote_machine_name(),conn->client_address,
 871                                  lp_servicename(SNUM(conn))));
 872
 873         /* Call VFS disconnect hook */
 874         VFS_DISCONNECT(conn);
 875
 876         yield_connection(conn, lp_servicename(SNUM(conn)));
 877
 878         file_close_conn(conn);
 879         dptr_closecnum(conn);
 880
 881         /* execute any "postexec = " line */
 882         if (*lp_postexec(SNUM(conn)) &&
 883             change_to_user(conn, vuid))  {
 884                 pstring cmd;
 885                 pstrcpy(cmd,lp_postexec(SNUM(conn)));
 886                 standard_sub_conn(conn,cmd,sizeof(cmd));
 887                 smbrun(cmd,NULL);
 888                 change_to_root_user();
 889         }
 890
 891         change_to_root_user();
 892         /* execute any "root postexec = " line */
 893         if (*lp_rootpostexec(SNUM(conn)))  {
 894                 pstring cmd;
 895                 pstrcpy(cmd,lp_rootpostexec(SNUM(conn)));
 896                 standard_sub_conn(conn,cmd,sizeof(cmd));
 897                 smbrun(cmd,NULL);
 898         }
 899
 900         /* make sure we leave the directory available for unmount */
 901         vfs_ChDir(conn, "/");
 902
 903         conn_free(conn);
 904 }