source/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24
  25 struct client_connection {
  26         struct client_connection *prev, *next;
  27         struct cli_state *cli;
  28         pstring mount;
  29 };
  30
  31 /* global state....globals reek! */
  32
  33 static pstring username;
  34 static pstring password;
  35 static BOOL use_kerberos;
  36 static BOOL got_pass;
  37 static int signing_state;
  38 int max_protocol = PROTOCOL_NT1;
  39
  40 static int port;
  41 static int name_type = 0x20;
  42 static BOOL have_ip;
  43 static struct in_addr dest_ip;
  44
  45 static struct client_connection *connections;
  46
  47 /********************************************************************
  48  Return a connection to a server.
  49 ********************************************************************/
  50
  51 static struct cli_state *do_connect( const char *server, const char *share,
  52                                      BOOL show_sessetup )
  53 {
  54         struct cli_state *c;
  55         struct nmb_name called, calling;
  56         const char *server_n;
  57         struct in_addr ip;
  58         pstring servicename;
  59         char *sharename;
  60         fstring newserver, newshare;
  61
  62         /* make a copy so we don't modify the global string 'service' */
  63         pstrcpy(servicename, share);
  64         sharename = servicename;
  65         if (*sharename == '\\') {
  66                 server = sharename+2;
  67                 sharename = strchr_m(server,'\\');
  68                 if (!sharename) return NULL;
  69                 *sharename = 0;
  70                 sharename++;
  71         }
  72
  73         server_n = server;
  74
  75         zero_ip(&ip);
  76
  77         make_nmb_name(&calling, global_myname(), 0x0);
  78         make_nmb_name(&called , server, name_type);
  79
  80  again:
  81         zero_ip(&ip);
  82         if (have_ip)
  83                 ip = dest_ip;
  84
  85         /* have to open a new connection */
  86         if (!(c=cli_initialise(NULL)) || (cli_set_port(c, port) != port) ||
  87             !cli_connect(c, server_n, &ip)) {
  88                 d_printf("Connection to %s failed\n", server_n);
  89                 return NULL;
  90         }
  91
  92         c->protocol = max_protocol;
  93         c->use_kerberos = use_kerberos;
  94         cli_setup_signing_state(c, signing_state);
  95
  96
  97         if (!cli_session_request(c, &calling, &called)) {
  98                 char *p;
  99                 d_printf("session request to %s failed (%s)\n",
 100                          called.name, cli_errstr(c));
 101                 cli_shutdown(c);
 102                 if ((p=strchr_m(called.name, '.'))) {
 103                         *p = 0;
 104                         goto again;
 105                 }
 106                 if (strcmp(called.name, "*SMBSERVER")) {
 107                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 108                         goto again;
 109                 }
 110                 return NULL;
 111         }
 112
 113         DEBUG(4,(" session request ok\n"));
 114
 115         if (!cli_negprot(c)) {
 116                 d_printf("protocol negotiation failed\n");
 117                 cli_shutdown(c);
 118                 return NULL;
 119         }
 120
 121         if (!got_pass) {
 122                 char *pass = getpass("Password: ");
 123                 if (pass) {
 124                         pstrcpy(password, pass);
 125                         got_pass = 1;
 126                 }
 127         }
 128
 129         if (!cli_session_setup(c, username,
 130                                password, strlen(password),
 131                                password, strlen(password),
 132                                lp_workgroup())) {
 133                 /* if a password was not supplied then try again with a null username */
 134                 if (password[0] || !username[0] || use_kerberos ||
 135                     !cli_session_setup(c, "", "", 0, "", 0, lp_workgroup())) {
 136                         d_printf("session setup failed: %s\n", cli_errstr(c));
 137                         if (NT_STATUS_V(cli_nt_error(c)) ==
 138                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 139                                 d_printf("did you forget to run kinit?\n");
 140                         cli_shutdown(c);
 141                         return NULL;
 142                 }
 143                 d_printf("Anonymous login successful\n");
 144         }
 145
 146         if ( show_sessetup ) {
 147                 if (*c->server_domain) {
 148                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 149                                 c->server_domain,c->server_os,c->server_type));
 150                 } else if (*c->server_os || *c->server_type){
 151                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 152                                  c->server_os,c->server_type));
 153                 }
 154         }
 155         DEBUG(4,(" session setup ok\n"));
 156
 157         /* here's the fun part....to support 'msdfs proxy' shares
 158            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 159            here before trying to connect to the original share.
 160            check_dfs_proxy() will fail if it is a normal share. */
 161
 162         if ( (c->capabilities & CAP_DFS) && cli_check_msdfs_proxy( c, sharename, newserver, newshare ) ) {
 163                 cli_shutdown(c);
 164                 return do_connect( newserver, newshare, False );
 165         }
 166
 167         /* must be a normal share */
 168
 169         if (!cli_send_tconX(c, sharename, "?????", password, strlen(password)+1)) {
 170                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 171                 cli_shutdown(c);
 172                 return NULL;
 173         }
 174
 175         DEBUG(4,(" tconx ok\n"));
 176
 177         return c;
 178 }
 179
 180 /****************************************************************************
 181 ****************************************************************************/
 182
 183 static void cli_cm_set_mntpoint( struct cli_state *c, const char *mnt )
 184 {
 185         struct client_connection *p;
 186         int i;
 187
 188         for ( p=connections,i=0; p; p=p->next,i++ ) {
 189                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 190                         break;
 191         }
 192
 193         if ( p ) {
 194                 pstrcpy( p->mount, mnt );
 195                 dos_clean_name( p->mount );
 196         }
 197 }
 198
 199 /****************************************************************************
 200 ****************************************************************************/
 201
 202 const char * cli_cm_get_mntpoint( struct cli_state *c )
 203 {
 204         struct client_connection *p;
 205         int i;
 206
 207         for ( p=connections,i=0; p; p=p->next,i++ ) {
 208                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 209                         break;
 210         }
 211
 212         if ( p )
 213                 return p->mount;
 214
 215         return NULL;
 216 }
 217
 218 /********************************************************************
 219  Add a new connection to the list
 220 ********************************************************************/
 221
 222 static struct cli_state* cli_cm_connect( const char *server, const char *share,
 223                                          BOOL show_hdr )
 224 {
 225         struct client_connection *node;
 226
 227         node = SMB_XMALLOC_P( struct client_connection );
 228
 229         node->cli = do_connect( server, share, show_hdr );
 230
 231         if ( !node->cli ) {
 232                 SAFE_FREE( node );
 233                 return NULL;
 234         }
 235
 236         DLIST_ADD( connections, node );
 237
 238         cli_cm_set_mntpoint( node->cli, "" );
 239
 240         return node->cli;
 241
 242 }
 243
 244 /********************************************************************
 245  Return a connection to a server.
 246 ********************************************************************/
 247
 248 static struct cli_state* cli_cm_find( const char *server, const char *share )
 249 {
 250         struct client_connection *p;
 251
 252         for ( p=connections; p; p=p->next ) {
 253                 if ( strequal(server, p->cli->desthost) && strequal(share,p->cli->share) )
 254                         return p->cli;
 255         }
 256
 257         return NULL;
 258 }
 259
 260 /****************************************************************************
 261  open a client connection to a \\server\share.  Set's the current *cli
 262  global variable as a side-effect (but only if the connection is successful).
 263 ****************************************************************************/
 264
 265 struct cli_state* cli_cm_open( const char *server, const char *share, BOOL show_hdr )
 266 {
 267         struct cli_state *c;
 268
 269         /* try to reuse an existing connection */
 270
 271         c = cli_cm_find( server, share );
 272
 273         if ( !c )
 274                 c = cli_cm_connect( server, share, show_hdr );
 275
 276         return c;
 277 }
 278
 279 /****************************************************************************
 280 ****************************************************************************/
 281
 282 void cli_cm_shutdown( void )
 283 {
 284
 285         struct client_connection *p, *x;
 286
 287         for ( p=connections; p; ) {
 288                 cli_shutdown( p->cli );
 289                 x = p;
 290                 p = p->next;
 291
 292                 SAFE_FREE( x );
 293         }
 294
 295         connections = NULL;
 296
 297         return;
 298 }
 299
 300 /****************************************************************************
 301 ****************************************************************************/
 302
 303 void cli_cm_display(void)
 304 {
 305         struct client_connection *p;
 306         int i;
 307
 308         for ( p=connections,i=0; p; p=p->next,i++ ) {
 309                 d_printf("%d:\tserver=%s, share=%s\n",
 310                         i, p->cli->desthost, p->cli->share );
 311         }
 312 }
 313
 314 /****************************************************************************
 315 ****************************************************************************/
 316
 317 void cli_cm_set_credentials( struct user_auth_info *user )
 318 {
 319         pstrcpy( username, user->username );
 320
 321         if ( user->got_pass ) {
 322                 pstrcpy( password, user->password );
 323                 got_pass = True;
 324         }
 325
 326         use_kerberos = user->use_kerberos;
 327         signing_state = user->signing_state;
 328 }
 329
 330 /****************************************************************************
 331 ****************************************************************************/
 332
 333 void cli_cm_set_port( int port_number )
 334 {
 335         port = port_number;
 336 }
 337
 338 /****************************************************************************
 339 ****************************************************************************/
 340
 341 void cli_cm_set_dest_name_type( int type )
 342 {
 343         name_type = type;
 344 }
 345
 346 /****************************************************************************
 347 ****************************************************************************/
 348
 349 void cli_cm_set_dest_ip(struct in_addr ip )
 350 {
 351         dest_ip = ip;
 352         have_ip = True;
 353 }
 354
 355 /********************************************************************
 356  split a dfs path into the server and share name components
 357 ********************************************************************/
 358
 359 static void split_dfs_path( const char *nodepath, fstring server, fstring share )
 360 {
 361         char *p;
 362         pstring path;
 363
 364         pstrcpy( path, nodepath );
 365
 366         if ( path[0] != '\\' )
 367                 return;
 368
 369         p = strrchr_m( path, '\\' );
 370
 371         if ( !p )
 372                 return;
 373
 374         *p = '\0';
 375         p++;
 376
 377         fstrcpy( share, p );
 378         fstrcpy( server, &path[1] );
 379 }
 380
 381 /****************************************************************************
 382  return the original path truncated at the first wildcard character
 383  (also strips trailing \'s).  Trust the caller to provide a NULL
 384  terminated string
 385 ****************************************************************************/
 386
 387 static void clean_path( pstring clean, const char *path )
 388 {
 389         int len;
 390         char *p;
 391         pstring newpath;
 392
 393         pstrcpy( newpath, path );
 394         p = newpath;
 395
 396         while ( p ) {
 397                 /* first check for '*' */
 398
 399                 p = strrchr_m( newpath, '*' );
 400                 if ( p ) {
 401                         *p = '\0';
 402                         p = newpath;
 403                         continue;
 404                 }
 405
 406                 /* first check for '?' */
 407
 408                 p = strrchr_m( newpath, '?' );
 409                 if ( p ) {
 410                         *p = '\0';
 411                         p = newpath;
 412                 }
 413         }
 414
 415         /* strip a trailing backslash */
 416
 417         len = strlen( newpath );
 418         if ( newpath[len-1] == '\\' )
 419                 newpath[len-1] = '\0';
 420
 421         pstrcpy( clean, newpath );
 422 }
 423
 424 /****************************************************************************
 425 ****************************************************************************/
 426
 427 BOOL cli_dfs_make_full_path( pstring path, const char *server, const char *share,
 428                             const char *dir )
 429 {
 430         pstring servicename;
 431         char *sharename;
 432         const char *directory;
 433
 434
 435         /* make a copy so we don't modify the global string 'service' */
 436
 437         pstrcpy(servicename, share);
 438         sharename = servicename;
 439
 440         if (*sharename == '\\') {
 441
 442                 server = sharename+2;
 443                 sharename = strchr_m(server,'\\');
 444
 445                 if (!sharename)
 446                         return False;
 447
 448                 *sharename = 0;
 449                 sharename++;
 450         }
 451
 452         directory = dir;
 453         if ( *directory == '\\' )
 454                 directory++;
 455
 456         pstr_sprintf( path, "\\%s\\%s\\%s", server, sharename, directory );
 457
 458         return True;
 459 }
 460
 461 /********************************************************************
 462  check for dfs referral
 463 ********************************************************************/
 464
 465 static BOOL cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 466 {
 467         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 468
 469         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 470
 471         if ( !( (flgs2&FLAGS2_32_BIT_ERROR_CODES) && (flgs2&FLAGS2_UNICODE_STRINGS) ) )
 472                 return False;
 473
 474         if ( NT_STATUS_EQUAL( status, NT_STATUS(IVAL(cli->inbuf,smb_rcls)) ) )
 475                 return True;
 476
 477         return False;
 478 }
 479
 480 /********************************************************************
 481  get the dfs referral link
 482 ********************************************************************/
 483
 484 BOOL cli_dfs_get_referral( struct cli_state *cli, const char *path,
 485                            CLIENT_DFS_REFERRAL**refs, size_t *num_refs,
 486                            uint16 *consumed)
 487 {
 488         unsigned int data_len = 0;
 489         unsigned int param_len = 0;
 490         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 491         char param[sizeof(pstring)+2];
 492         pstring data;
 493         char *rparam=NULL, *rdata=NULL;
 494         char *p;
 495         size_t pathlen = 2*(strlen(path)+1);
 496         uint16 num_referrals;
 497         CLIENT_DFS_REFERRAL *referrals = NULL;
 498
 499         memset(param, 0, sizeof(param));
 500         SSVAL(param, 0, 0x03);  /* max referral level */
 501         p = &param[2];
 502
 503         p += clistr_push(cli, p, path, MIN(pathlen, sizeof(param)-2), STR_TERMINATE);
 504         param_len = PTR_DIFF(p, param);
 505
 506         if (!cli_send_trans(cli, SMBtrans2,
 507                 NULL,                        /* name */
 508                 -1, 0,                          /* fid, flags */
 509                 &setup, 1, 0,                   /* setup, length, max */
 510                 param, param_len, 2,            /* param, length, max */
 511                 (char *)&data,  data_len, cli->max_xmit /* data, length, max */
 512                 )) {
 513                         return False;
 514         }
 515
 516         if (!cli_receive_trans(cli, SMBtrans2,
 517                 &rparam, &param_len,
 518                 &rdata, &data_len)) {
 519                         return False;
 520         }
 521
 522         *consumed     = SVAL( rdata, 0 );
 523         num_referrals = SVAL( rdata, 2 );
 524
 525         if ( num_referrals != 0 ) {
 526                 uint16 ref_version;
 527                 uint16 ref_size;
 528                 int i;
 529                 uint16 node_offset;
 530
 531
 532                 referrals = SMB_XMALLOC_ARRAY( CLIENT_DFS_REFERRAL, num_referrals );
 533
 534                 /* start at the referrals array */
 535
 536                 p = rdata+8;
 537                 for ( i=0; i<num_referrals; i++ ) {
 538                         ref_version = SVAL( p, 0 );
 539                         ref_size    = SVAL( p, 2 );
 540                         node_offset = SVAL( p, 16 );
 541
 542                         if ( ref_version != 3 ) {
 543                                 p += ref_size;
 544                                 continue;
 545                         }
 546
 547                         referrals[i].proximity = SVAL( p, 8 );
 548                         referrals[i].ttl       = SVAL( p, 10 );
 549
 550                         clistr_pull( cli, referrals[i].dfspath, p+node_offset,
 551                                 sizeof(referrals[i].dfspath), -1, STR_TERMINATE|STR_UNICODE );
 552
 553                         p += ref_size;
 554                 }
 555
 556         }
 557
 558         *num_refs = num_referrals;
 559         *refs = referrals;
 560
 561         SAFE_FREE(rdata);
 562         SAFE_FREE(rparam);
 563
 564         return True;
 565 }
 566
 567 /********************************************************************
 568 ********************************************************************/
 569
 570 BOOL cli_resolve_path( const char *mountpt, struct cli_state *rootcli, const char *path,
 571                        struct cli_state **targetcli, pstring targetpath )
 572 {
 573         CLIENT_DFS_REFERRAL *refs = NULL;
 574         size_t num_refs;
 575         uint16 consumed;
 576         struct cli_state *cli_ipc;
 577         pstring fullpath, cleanpath;
 578         int pathlen;
 579         fstring server, share;
 580         struct cli_state *newcli;
 581         pstring newpath;
 582         pstring newmount;
 583         char *ppath;
 584
 585         SMB_STRUCT_STAT sbuf;
 586         uint32 attributes;
 587
 588         if ( !rootcli || !path || !targetcli )
 589                 return False;
 590
 591         *targetcli = NULL;
 592
 593         /* send a trans2_query_path_info to check for a referral */
 594
 595         clean_path( cleanpath,  path );
 596         cli_dfs_make_full_path( fullpath, rootcli->desthost, rootcli->share, cleanpath );
 597
 598         /* don't bother continuing if this is not a dfs root */
 599
 600         if ( !rootcli->dfsroot || cli_qpathinfo_basic( rootcli, cleanpath, &sbuf, &attributes ) ) {
 601                 *targetcli = rootcli;
 602                 pstrcpy( targetpath, path );
 603                 return True;
 604         }
 605
 606         /* special case where client asked for a path that does not exist */
 607
 608         if ( cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND) ) {
 609                 *targetcli = rootcli;
 610                 pstrcpy( targetpath, path );
 611                 return True;
 612         }
 613
 614         /* we got an error, check for DFS referral */
 615
 616         if ( !cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED) )
 617                 return False;
 618
 619         /* check for the referral */
 620
 621         if ( !(cli_ipc = cli_cm_open( rootcli->desthost, "IPC$", False )) )
 622                 return False;
 623
 624         if ( !cli_dfs_get_referral(cli_ipc, fullpath, &refs, &num_refs, &consumed)
 625                 || !num_refs )
 626         {
 627                 return False;
 628         }
 629
 630         /* just store the first referral for now
 631            Make sure to recreate the original string including any wildcards */
 632
 633         cli_dfs_make_full_path( fullpath, rootcli->desthost, rootcli->share, path );
 634         pathlen = strlen( fullpath )*2;
 635         consumed = MIN(pathlen, consumed );
 636         pstrcpy( targetpath, &fullpath[consumed/2] );
 637
 638         split_dfs_path( refs[0].dfspath, server, share );
 639         SAFE_FREE( refs );
 640
 641         /* open the connection to the target path */
 642
 643         if ( (*targetcli = cli_cm_open(server, share, False)) == NULL ) {
 644                 d_printf("Unable to follow dfs referral [//%s/%s]\n",
 645                         server, share );
 646
 647                 return False;
 648         }
 649
 650         /* parse out the consumed mount path */
 651         /* trim off the \server\share\ */
 652
 653         fullpath[consumed/2] = '\0';
 654         dos_clean_name( fullpath );
 655         ppath = strchr_m( fullpath, '\\' );
 656         ppath = strchr_m( ppath+1, '\\' );
 657         ppath = strchr_m( ppath+1, '\\' );
 658         ppath++;
 659
 660         pstr_sprintf( newmount, "%s\\%s", mountpt, ppath );
 661         cli_cm_set_mntpoint( *targetcli, newmount );
 662
 663         /* check for another dfs referral, note that we are not
 664            checking for loops here */
 665
 666         if ( !strequal( targetpath, "\\" ) ) {
 667                 if ( cli_resolve_path( newmount, *targetcli, targetpath, &newcli, newpath ) ) {
 668                         *targetcli = newcli;
 669                         pstrcpy( targetpath, newpath );
 670                 }
 671         }
 672
 673         return True;
 674 }
 675
 676 /********************************************************************
 677 ********************************************************************/
 678
 679 BOOL cli_check_msdfs_proxy( struct cli_state *cli, const char *sharename,
 680                             fstring newserver, fstring newshare )
 681 {
 682         CLIENT_DFS_REFERRAL *refs = NULL;
 683         size_t num_refs;
 684         uint16 consumed;
 685         pstring fullpath;
 686         BOOL res;
 687         uint16 cnum;
 688
 689         if ( !cli || !sharename )
 690                 return False;
 691
 692         cnum = cli->cnum;
 693
 694         /* special case.  never check for a referral on the IPC$ share */
 695
 696         if ( strequal( sharename, "IPC$" ) )
 697                 return False;
 698
 699         /* send a trans2_query_path_info to check for a referral */
 700
 701         pstr_sprintf( fullpath, "\\%s\\%s", cli->desthost, sharename );
 702
 703         /* check for the referral */
 704
 705         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
 706                 return False;
 707         }
 708
 709         res = cli_dfs_get_referral(cli, fullpath, &refs, &num_refs, &consumed);
 710
 711         if (!cli_tdis(cli)) {
 712                 return False;
 713         }
 714
 715         cli->cnum = cnum;
 716
 717         if (!res || !num_refs ) {
 718                 return False;
 719         }
 720
 721         split_dfs_path( refs[0].dfspath, newserver, newshare );
 722
 723         /* check that this is not a self-referral */
 724
 725         if ( strequal( cli->desthost, newserver ) && strequal( sharename, newshare ) )
 726                 return False;
 727
 728         SAFE_FREE( refs );
 729
 730         return True;
 731 }