source3/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 = NULL;
  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()) || (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                 c = NULL;
 103                 if ((p=strchr_m(called.name, '.'))) {
 104                         *p = 0;
 105                         goto again;
 106                 }
 107                 if (strcmp(called.name, "*SMBSERVER")) {
 108                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 109                         goto again;
 110                 }
 111                 return NULL;
 112         }
 113
 114         DEBUG(4,(" session request ok\n"));
 115
 116         if (!cli_negprot(c)) {
 117                 d_printf("protocol negotiation failed\n");
 118                 cli_shutdown(c);
 119                 return NULL;
 120         }
 121
 122         if (!got_pass) {
 123                 char *pass = getpass("Password: ");
 124                 if (pass) {
 125                         pstrcpy(password, pass);
 126                         got_pass = 1;
 127                 }
 128         }
 129
 130         if (!cli_session_setup(c, username,
 131                                password, strlen(password),
 132                                password, strlen(password),
 133                                lp_workgroup())) {
 134                 /* if a password was not supplied then try again with a null username */
 135                 if (password[0] || !username[0] || use_kerberos ||
 136                     !cli_session_setup(c, "", "", 0, "", 0, lp_workgroup())) {
 137                         d_printf("session setup failed: %s\n", cli_errstr(c));
 138                         if (NT_STATUS_V(cli_nt_error(c)) ==
 139                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 140                                 d_printf("did you forget to run kinit?\n");
 141                         cli_shutdown(c);
 142                         return NULL;
 143                 }
 144                 d_printf("Anonymous login successful\n");
 145         }
 146
 147         if ( show_sessetup ) {
 148                 if (*c->server_domain) {
 149                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 150                                 c->server_domain,c->server_os,c->server_type));
 151                 } else if (*c->server_os || *c->server_type){
 152                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 153                                  c->server_os,c->server_type));
 154                 }
 155         }
 156         DEBUG(4,(" session setup ok\n"));
 157
 158         /* here's the fun part....to support 'msdfs proxy' shares
 159            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 160            here before trying to connect to the original share.
 161            check_dfs_proxy() will fail if it is a normal share. */
 162
 163         if ( (c->capabilities & CAP_DFS) && cli_check_msdfs_proxy( c, sharename, newserver, newshare ) ) {
 164                 cli_shutdown(c);
 165                 return do_connect( newserver, newshare, False );
 166         }
 167
 168         /* must be a normal share */
 169
 170         if (!cli_send_tconX(c, sharename, "?????", password, strlen(password)+1)) {
 171                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 172                 cli_shutdown(c);
 173                 return NULL;
 174         }
 175
 176         DEBUG(4,(" tconx ok\n"));
 177
 178         return c;
 179 }
 180
 181 /****************************************************************************
 182 ****************************************************************************/
 183
 184 static void cli_cm_set_mntpoint( struct cli_state *c, const char *mnt )
 185 {
 186         struct client_connection *p;
 187         int i;
 188
 189         for ( p=connections,i=0; p; p=p->next,i++ ) {
 190                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 191                         break;
 192         }
 193
 194         if ( p ) {
 195                 pstrcpy( p->mount, mnt );
 196                 dos_clean_name( p->mount );
 197         }
 198 }
 199
 200 /****************************************************************************
 201 ****************************************************************************/
 202
 203 const char * cli_cm_get_mntpoint( struct cli_state *c )
 204 {
 205         struct client_connection *p;
 206         int i;
 207
 208         for ( p=connections,i=0; p; p=p->next,i++ ) {
 209                 if ( strequal(p->cli->desthost, c->desthost) && strequal(p->cli->share, c->share) )
 210                         break;
 211         }
 212
 213         if ( p )
 214                 return p->mount;
 215
 216         return NULL;
 217 }
 218
 219 /********************************************************************
 220  Add a new connection to the list
 221 ********************************************************************/
 222
 223 static struct cli_state* cli_cm_connect( const char *server, const char *share,
 224                                          BOOL show_hdr )
 225 {
 226         struct client_connection *node;
 227
 228         node = SMB_XMALLOC_P( struct client_connection );
 229
 230         node->cli = do_connect( server, share, show_hdr );
 231
 232         if ( !node->cli ) {
 233                 SAFE_FREE( node );
 234                 return NULL;
 235         }
 236
 237         DLIST_ADD( connections, node );
 238
 239         cli_cm_set_mntpoint( node->cli, "" );
 240
 241         return node->cli;
 242
 243 }
 244
 245 /********************************************************************
 246  Return a connection to a server.
 247 ********************************************************************/
 248
 249 static struct cli_state* cli_cm_find( const char *server, const char *share )
 250 {
 251         struct client_connection *p;
 252
 253         for ( p=connections; p; p=p->next ) {
 254                 if ( strequal(server, p->cli->desthost) && strequal(share,p->cli->share) )
 255                         return p->cli;
 256         }
 257
 258         return NULL;
 259 }
 260
 261 /****************************************************************************
 262  open a client connection to a \\server\share.  Set's the current *cli
 263  global variable as a side-effect (but only if the connection is successful).
 264 ****************************************************************************/
 265
 266 struct cli_state* cli_cm_open( const char *server, const char *share, BOOL show_hdr )
 267 {
 268         struct cli_state *c;
 269
 270         /* try to reuse an existing connection */
 271
 272         c = cli_cm_find( server, share );
 273
 274         if ( !c )
 275                 c = cli_cm_connect( server, share, show_hdr );
 276
 277         return c;
 278 }
 279
 280 /****************************************************************************
 281 ****************************************************************************/
 282
 283 void cli_cm_shutdown( void )
 284 {
 285
 286         struct client_connection *p, *x;
 287
 288         for ( p=connections; p; ) {
 289                 cli_shutdown( p->cli );
 290                 x = p;
 291                 p = p->next;
 292
 293                 SAFE_FREE( x );
 294         }
 295
 296         connections = NULL;
 297
 298         return;
 299 }
 300
 301 /****************************************************************************
 302 ****************************************************************************/
 303
 304 void cli_cm_display(void)
 305 {
 306         struct client_connection *p;
 307         int i;
 308
 309         for ( p=connections,i=0; p; p=p->next,i++ ) {
 310                 d_printf("%d:\tserver=%s, share=%s\n",
 311                         i, p->cli->desthost, p->cli->share );
 312         }
 313 }
 314
 315 /****************************************************************************
 316 ****************************************************************************/
 317
 318 void cli_cm_set_credentials( struct user_auth_info *user )
 319 {
 320         pstrcpy( username, user->username );
 321
 322         if ( user->got_pass ) {
 323                 pstrcpy( password, user->password );
 324                 got_pass = True;
 325         }
 326
 327         use_kerberos = user->use_kerberos;
 328         signing_state = user->signing_state;
 329 }
 330
 331 /****************************************************************************
 332 ****************************************************************************/
 333
 334 void cli_cm_set_port( int port_number )
 335 {
 336         port = port_number;
 337 }
 338
 339 /****************************************************************************
 340 ****************************************************************************/
 341
 342 void cli_cm_set_dest_name_type( int type )
 343 {
 344         name_type = type;
 345 }
 346
 347 /****************************************************************************
 348 ****************************************************************************/
 349
 350 void cli_cm_set_dest_ip(struct in_addr ip )
 351 {
 352         dest_ip = ip;
 353         have_ip = True;
 354 }
 355
 356 /********************************************************************
 357  split a dfs path into the server and share name components
 358 ********************************************************************/
 359
 360 static void split_dfs_path( const char *nodepath, fstring server, fstring share )
 361 {
 362         char *p;
 363         pstring path;
 364
 365         pstrcpy( path, nodepath );
 366
 367         if ( path[0] != '\\' )
 368                 return;
 369
 370         p = strrchr_m( path, '\\' );
 371
 372         if ( !p )
 373                 return;
 374
 375         *p = '\0';
 376         p++;
 377
 378         fstrcpy( share, p );
 379         fstrcpy( server, &path[1] );
 380 }
 381
 382 /****************************************************************************
 383  return the original path truncated at the first wildcard character
 384  (also strips trailing \'s).  Trust the caller to provide a NULL
 385  terminated string
 386 ****************************************************************************/
 387
 388 static void clean_path( pstring clean, const char *path )
 389 {
 390         int len;
 391         char *p;
 392         pstring newpath;
 393
 394         pstrcpy( newpath, path );
 395         p = newpath;
 396
 397         while ( p ) {
 398                 /* first check for '*' */
 399
 400                 p = strrchr_m( newpath, '*' );
 401                 if ( p ) {
 402                         *p = '\0';
 403                         p = newpath;
 404                         continue;
 405                 }
 406
 407                 /* first check for '?' */
 408
 409                 p = strrchr_m( newpath, '?' );
 410                 if ( p ) {
 411                         *p = '\0';
 412                         p = newpath;
 413                 }
 414         }
 415
 416         /* strip a trailing backslash */
 417
 418         len = strlen( newpath );
 419         if ( (len > 0) && (newpath[len-1] == '\\') )
 420                 newpath[len-1] = '\0';
 421
 422         pstrcpy( clean, newpath );
 423 }
 424
 425 /****************************************************************************
 426 ****************************************************************************/
 427
 428 BOOL cli_dfs_make_full_path( pstring path, const char *server, const char *share,
 429                             const char *dir )
 430 {
 431         pstring servicename;
 432         char *sharename;
 433         const char *directory;
 434
 435
 436         /* make a copy so we don't modify the global string 'service' */
 437
 438         pstrcpy(servicename, share);
 439         sharename = servicename;
 440
 441         if (*sharename == '\\') {
 442
 443                 server = sharename+2;
 444                 sharename = strchr_m(server,'\\');
 445
 446                 if (!sharename)
 447                         return False;
 448
 449                 *sharename = 0;
 450                 sharename++;
 451         }
 452
 453         directory = dir;
 454         if ( *directory == '\\' )
 455                 directory++;
 456
 457         pstr_sprintf( path, "\\%s\\%s\\%s", server, sharename, directory );
 458
 459         return True;
 460 }
 461
 462 /********************************************************************
 463  check for dfs referral
 464 ********************************************************************/
 465
 466 static BOOL cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 467 {
 468         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 469
 470         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 471
 472         if ( !( (flgs2&FLAGS2_32_BIT_ERROR_CODES) && (flgs2&FLAGS2_UNICODE_STRINGS) ) )
 473                 return False;
 474
 475         if ( NT_STATUS_EQUAL( status, NT_STATUS(IVAL(cli->inbuf,smb_rcls)) ) )
 476                 return True;
 477
 478         return False;
 479 }
 480
 481 /********************************************************************
 482  get the dfs referral link
 483 ********************************************************************/
 484
 485 BOOL cli_dfs_get_referral( struct cli_state *cli, const char *path,
 486                            CLIENT_DFS_REFERRAL**refs, size_t *num_refs,
 487                            uint16 *consumed)
 488 {
 489         unsigned int data_len = 0;
 490         unsigned int param_len = 0;
 491         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 492         char param[sizeof(pstring)+2];
 493         pstring data;
 494         char *rparam=NULL, *rdata=NULL;
 495         char *p;
 496         size_t pathlen = 2*(strlen(path)+1);
 497         uint16 num_referrals;
 498         CLIENT_DFS_REFERRAL *referrals = NULL;
 499
 500         memset(param, 0, sizeof(param));
 501         SSVAL(param, 0, 0x03);  /* max referral level */
 502         p = &param[2];
 503
 504         p += clistr_push(cli, p, path, MIN(pathlen, sizeof(param)-2), STR_TERMINATE);
 505         param_len = PTR_DIFF(p, param);
 506
 507         if (!cli_send_trans(cli, SMBtrans2,
 508                 NULL,                        /* name */
 509                 -1, 0,                          /* fid, flags */
 510                 &setup, 1, 0,                   /* setup, length, max */
 511                 param, param_len, 2,            /* param, length, max */
 512                 (char *)&data,  data_len, cli->max_xmit /* data, length, max */
 513                 )) {
 514                         return False;
 515         }
 516
 517         if (!cli_receive_trans(cli, SMBtrans2,
 518                 &rparam, &param_len,
 519                 &rdata, &data_len)) {
 520                         return False;
 521         }
 522
 523         *consumed     = SVAL( rdata, 0 );
 524         num_referrals = SVAL( rdata, 2 );
 525
 526         if ( num_referrals != 0 ) {
 527                 uint16 ref_version;
 528                 uint16 ref_size;
 529                 int i;
 530                 uint16 node_offset;
 531
 532
 533                 referrals = SMB_XMALLOC_ARRAY( CLIENT_DFS_REFERRAL, num_referrals );
 534
 535                 /* start at the referrals array */
 536
 537                 p = rdata+8;
 538                 for ( i=0; i<num_referrals; i++ ) {
 539                         ref_version = SVAL( p, 0 );
 540                         ref_size    = SVAL( p, 2 );
 541                         node_offset = SVAL( p, 16 );
 542
 543                         if ( ref_version != 3 ) {
 544                                 p += ref_size;
 545                                 continue;
 546                         }
 547
 548                         referrals[i].proximity = SVAL( p, 8 );
 549                         referrals[i].ttl       = SVAL( p, 10 );
 550
 551                         clistr_pull( cli, referrals[i].dfspath, p+node_offset,
 552                                 sizeof(referrals[i].dfspath), -1, STR_TERMINATE|STR_UNICODE );
 553
 554                         p += ref_size;
 555                 }
 556
 557         }
 558
 559         *num_refs = num_referrals;
 560         *refs = referrals;
 561
 562         SAFE_FREE(rdata);
 563         SAFE_FREE(rparam);
 564
 565         return True;
 566 }
 567
 568 /********************************************************************
 569 ********************************************************************/
 570
 571 BOOL cli_resolve_path( const char *mountpt, struct cli_state *rootcli, const char *path,
 572                        struct cli_state **targetcli, pstring targetpath )
 573 {
 574         CLIENT_DFS_REFERRAL *refs = NULL;
 575         size_t num_refs;
 576         uint16 consumed;
 577         struct cli_state *cli_ipc;
 578         pstring fullpath, cleanpath;
 579         int pathlen;
 580         fstring server, share;
 581         struct cli_state *newcli;
 582         pstring newpath;
 583         pstring newmount;
 584         char *ppath;
 585
 586         SMB_STRUCT_STAT sbuf;
 587         uint32 attributes;
 588
 589         if ( !rootcli || !path || !targetcli )
 590                 return False;
 591
 592         *targetcli = NULL;
 593
 594         /* send a trans2_query_path_info to check for a referral */
 595
 596         clean_path( cleanpath,  path );
 597         cli_dfs_make_full_path( fullpath, rootcli->desthost, rootcli->share, cleanpath );
 598
 599         /* don't bother continuing if this is not a dfs root */
 600
 601         if ( !rootcli->dfsroot || cli_qpathinfo_basic( rootcli, cleanpath, &sbuf, &attributes ) ) {
 602                 *targetcli = rootcli;
 603                 pstrcpy( targetpath, path );
 604                 return True;
 605         }
 606
 607         /* special case where client asked for a path that does not exist */
 608
 609         if ( cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND) ) {
 610                 *targetcli = rootcli;
 611                 pstrcpy( targetpath, path );
 612                 return True;
 613         }
 614
 615         /* we got an error, check for DFS referral */
 616
 617         if ( !cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED) )
 618                 return False;
 619
 620         /* check for the referral */
 621
 622         if ( !(cli_ipc = cli_cm_open( rootcli->desthost, "IPC$", False )) )
 623                 return False;
 624
 625         if ( !cli_dfs_get_referral(cli_ipc, fullpath, &refs, &num_refs, &consumed)
 626                 || !num_refs )
 627         {
 628                 return False;
 629         }
 630
 631         /* just store the first referral for now
 632            Make sure to recreate the original string including any wildcards */
 633
 634         cli_dfs_make_full_path( fullpath, rootcli->desthost, rootcli->share, path );
 635         pathlen = strlen( fullpath )*2;
 636         consumed = MIN(pathlen, consumed );
 637         pstrcpy( targetpath, &fullpath[consumed/2] );
 638
 639         split_dfs_path( refs[0].dfspath, server, share );
 640         SAFE_FREE( refs );
 641
 642         /* open the connection to the target path */
 643
 644         if ( (*targetcli = cli_cm_open(server, share, False)) == NULL ) {
 645                 d_printf("Unable to follow dfs referral [//%s/%s]\n",
 646                         server, share );
 647
 648                 return False;
 649         }
 650
 651         /* parse out the consumed mount path */
 652         /* trim off the \server\share\ */
 653
 654         fullpath[consumed/2] = '\0';
 655         dos_clean_name( fullpath );
 656         if ((ppath = strchr_m( fullpath, '\\' )) == NULL)
 657                 return False;
 658         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL)
 659                 return False;
 660         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL)
 661                 return False;
 662         ppath++;
 663
 664         pstr_sprintf( newmount, "%s\\%s", mountpt, ppath );
 665         cli_cm_set_mntpoint( *targetcli, newmount );
 666
 667         /* check for another dfs referral, note that we are not
 668            checking for loops here */
 669
 670         if ( !strequal( targetpath, "\\" ) ) {
 671                 if ( cli_resolve_path( newmount, *targetcli, targetpath, &newcli, newpath ) ) {
 672                         *targetcli = newcli;
 673                         pstrcpy( targetpath, newpath );
 674                 }
 675         }
 676
 677         return True;
 678 }
 679
 680 /********************************************************************
 681 ********************************************************************/
 682
 683 BOOL cli_check_msdfs_proxy( struct cli_state *cli, const char *sharename,
 684                             fstring newserver, fstring newshare )
 685 {
 686         CLIENT_DFS_REFERRAL *refs = NULL;
 687         size_t num_refs;
 688         uint16 consumed;
 689         pstring fullpath;
 690         BOOL res;
 691         uint16 cnum;
 692
 693         if ( !cli || !sharename )
 694                 return False;
 695
 696         cnum = cli->cnum;
 697
 698         /* special case.  never check for a referral on the IPC$ share */
 699
 700         if ( strequal( sharename, "IPC$" ) )
 701                 return False;
 702
 703         /* send a trans2_query_path_info to check for a referral */
 704
 705         pstr_sprintf( fullpath, "\\%s\\%s", cli->desthost, sharename );
 706
 707         /* check for the referral */
 708
 709         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
 710                 return False;
 711         }
 712
 713         res = cli_dfs_get_referral(cli, fullpath, &refs, &num_refs, &consumed);
 714
 715         if (!cli_tdis(cli)) {
 716                 SAFE_FREE( refs );
 717                 return False;
 718         }
 719
 720         cli->cnum = cnum;
 721
 722         if (!res || !num_refs ) {
 723                 SAFE_FREE( refs );
 724                 return False;
 725         }
 726
 727         split_dfs_path( refs[0].dfspath, newserver, newshare );
 728
 729         /* check that this is not a self-referral */
 730
 731         if ( strequal( cli->desthost, newserver ) && strequal( sharename, newshare ) ) {
 732                 SAFE_FREE( refs );
 733                 return False;
 734         }
 735
 736         SAFE_FREE( refs );
 737
 738         return True;
 739 }