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    Copyright (C) Jeremy Allison                   2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /********************************************************************
  25  Important point.
  26
  27  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  28  are not C escaped here).
  29
  30  - but if we're using POSIX paths then <pathname> may contain
  31    '/' separators, not '\\' separators. So cope with '\\' or '/'
  32    as a separator when looking at the pathname part.... JRA.
  33 ********************************************************************/
  34
  35 struct client_connection {
  36         struct client_connection *prev, *next;
  37         struct cli_state *cli;
  38         char *mount;
  39 };
  40
  41 /* global state....globals reek! */
  42 int max_protocol = PROTOCOL_NT1;
  43
  44 static struct cm_cred_struct {
  45         char *username;
  46         char *password;
  47         bool got_pass;
  48         bool use_kerberos;
  49         bool fallback_after_kerberos;
  50         int signing_state;
  51 } cm_creds;
  52
  53 static void cm_set_password(const char *newpass);
  54
  55 static int port;
  56 static int name_type = 0x20;
  57 static bool have_ip;
  58 static struct sockaddr_storage dest_ss;
  59
  60 static struct client_connection *connections;
  61
  62 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
  63                                 struct cli_state *cli,
  64                                 const char *sharename,
  65                                 char **pp_newserver,
  66                                 char **pp_newshare,
  67                                 bool force_encrypt,
  68                                 const char *username,
  69                                 const char *password,
  70                                 const char *domain);
  71
  72 /********************************************************************
  73  Ensure a connection is encrypted.
  74 ********************************************************************/
  75
  76 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  77                         const char *username,
  78                         const char *password,
  79                         const char *domain,
  80                         const char *sharename)
  81 {
  82         NTSTATUS status = cli_force_encryption(c,
  83                                         username,
  84                                         password,
  85                                         domain);
  86
  87         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  88                 d_printf("Encryption required and "
  89                         "server that doesn't support "
  90                         "UNIX extensions - failing connect\n");
  91         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  92                 d_printf("Encryption required and "
  93                         "can't get UNIX CIFS extensions "
  94                         "version from server.\n");
  95         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  96                 d_printf("Encryption required and "
  97                         "share %s doesn't support "
  98                         "encryption.\n", sharename);
  99         } else if (!NT_STATUS_IS_OK(status)) {
 100                 d_printf("Encryption required and "
 101                         "setup failed with error %s.\n",
 102                         nt_errstr(status));
 103         }
 104
 105         return status;
 106 }
 107
 108 /********************************************************************
 109  Return a connection to a server.
 110 ********************************************************************/
 111
 112 static struct cli_state *do_connect(TALLOC_CTX *ctx,
 113                                         const char *server,
 114                                         const char *share,
 115                                         bool show_sessetup,
 116                                         bool force_encrypt)
 117 {
 118         struct cli_state *c = NULL;
 119         struct nmb_name called, calling;
 120         const char *server_n;
 121         struct sockaddr_storage ss;
 122         char *servicename;
 123         char *sharename;
 124         char *newserver, *newshare;
 125         const char *username;
 126         const char *password;
 127         NTSTATUS status;
 128
 129         /* make a copy so we don't modify the global string 'service' */
 130         servicename = talloc_strdup(ctx,share);
 131         if (!servicename) {
 132                 return NULL;
 133         }
 134         sharename = servicename;
 135         if (*sharename == '\\') {
 136                 server = sharename+2;
 137                 sharename = strchr_m(server,'\\');
 138                 if (!sharename) {
 139                         return NULL;
 140                 }
 141                 *sharename = 0;
 142                 sharename++;
 143         }
 144
 145         server_n = server;
 146
 147         zero_addr(&ss);
 148
 149         make_nmb_name(&calling, global_myname(), 0x0);
 150         make_nmb_name(&called , server, name_type);
 151
 152  again:
 153         zero_addr(&ss);
 154         if (have_ip)
 155                 ss = dest_ss;
 156
 157         /* have to open a new connection */
 158         if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) {
 159                 d_printf("Connection to %s failed\n", server_n);
 160                 if (c) {
 161                         cli_shutdown(c);
 162                 }
 163                 return NULL;
 164         }
 165         status = cli_connect(c, server_n, &ss);
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 d_printf("Connection to %s failed (Error %s)\n",
 168                                 server_n,
 169                                 nt_errstr(status));
 170                 cli_shutdown(c);
 171                 return NULL;
 172         }
 173
 174         c->protocol = max_protocol;
 175         c->use_kerberos = cm_creds.use_kerberos;
 176         c->fallback_after_kerberos = cm_creds.fallback_after_kerberos;
 177         cli_setup_signing_state(c, cm_creds.signing_state);
 178
 179         if (!cli_session_request(c, &calling, &called)) {
 180                 char *p;
 181                 d_printf("session request to %s failed (%s)\n",
 182                          called.name, cli_errstr(c));
 183                 cli_shutdown(c);
 184                 c = NULL;
 185                 if ((p=strchr_m(called.name, '.'))) {
 186                         *p = 0;
 187                         goto again;
 188                 }
 189                 if (strcmp(called.name, "*SMBSERVER")) {
 190                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 191                         goto again;
 192                 }
 193                 return NULL;
 194         }
 195
 196         DEBUG(4,(" session request ok\n"));
 197
 198         if (!cli_negprot(c)) {
 199                 d_printf("protocol negotiation failed\n");
 200                 cli_shutdown(c);
 201                 return NULL;
 202         }
 203
 204         if (!cm_creds.got_pass && !cm_creds.use_kerberos) {
 205                 char *pass = getpass("Password: ");
 206                 if (pass) {
 207                         cm_set_password(pass);
 208                 }
 209         }
 210
 211         username = cm_creds.username ? cm_creds.username : "";
 212         password = cm_creds.password ? cm_creds.password : "";
 213
 214         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 215                                                password, strlen(password),
 216                                                password, strlen(password),
 217                                                lp_workgroup()))) {
 218                 /* If a password was not supplied then
 219                  * try again with a null username. */
 220                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 221                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 222                                                 "", 0,
 223                                                 "", 0,
 224                                                lp_workgroup()))) {
 225                         d_printf("session setup failed: %s\n", cli_errstr(c));
 226                         if (NT_STATUS_V(cli_nt_error(c)) ==
 227                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 228                                 d_printf("did you forget to run kinit?\n");
 229                         cli_shutdown(c);
 230                         return NULL;
 231                 }
 232                 d_printf("Anonymous login successful\n");
 233         }
 234
 235         if ( show_sessetup ) {
 236                 if (*c->server_domain) {
 237                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 238                                 c->server_domain,c->server_os,c->server_type));
 239                 } else if (*c->server_os || *c->server_type) {
 240                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 241                                  c->server_os,c->server_type));
 242                 }
 243         }
 244         DEBUG(4,(" session setup ok\n"));
 245
 246         /* here's the fun part....to support 'msdfs proxy' shares
 247            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 248            here before trying to connect to the original share.
 249            check_dfs_proxy() will fail if it is a normal share. */
 250
 251         if ((c->capabilities & CAP_DFS) &&
 252                         cli_check_msdfs_proxy(ctx, c, sharename,
 253                                 &newserver, &newshare,
 254                                 force_encrypt,
 255                                 username,
 256                                 password,
 257                                 lp_workgroup())) {
 258                 cli_shutdown(c);
 259                 return do_connect(ctx, newserver,
 260                                 newshare, false, force_encrypt);
 261         }
 262
 263         /* must be a normal share */
 264
 265         if (!cli_send_tconX(c, sharename, "?????",
 266                                 password, strlen(password)+1)) {
 267                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 268                 cli_shutdown(c);
 269                 return NULL;
 270         }
 271
 272         if (force_encrypt) {
 273                 status = cli_cm_force_encryption(c,
 274                                         username,
 275                                         password,
 276                                         lp_workgroup(),
 277                                         sharename);
 278                 if (!NT_STATUS_IS_OK(status)) {
 279                         cli_shutdown(c);
 280                         return NULL;
 281                 }
 282         }
 283
 284         DEBUG(4,(" tconx ok\n"));
 285         return c;
 286 }
 287
 288 /****************************************************************************
 289 ****************************************************************************/
 290
 291 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 292 {
 293         struct client_connection *p;
 294         int i;
 295
 296         for (p=connections,i=0; p; p=p->next,i++) {
 297                 if (strequal(p->cli->desthost, c->desthost) &&
 298                                 strequal(p->cli->share, c->share)) {
 299                         break;
 300                 }
 301         }
 302
 303         if (p) {
 304                 char *name = clean_name(NULL, p->mount);
 305                 if (!name) {
 306                         return;
 307                 }
 308                 p->mount = talloc_strdup(p, name);
 309                 TALLOC_FREE(name);
 310         }
 311 }
 312
 313 /****************************************************************************
 314 ****************************************************************************/
 315
 316 const char *cli_cm_get_mntpoint(struct cli_state *c)
 317 {
 318         struct client_connection *p;
 319         int i;
 320
 321         for (p=connections,i=0; p; p=p->next,i++) {
 322                 if (strequal(p->cli->desthost, c->desthost) &&
 323                                 strequal(p->cli->share, c->share)) {
 324                         break;
 325                 }
 326         }
 327
 328         if (p) {
 329                 return p->mount;
 330         }
 331         return NULL;
 332 }
 333
 334 /********************************************************************
 335  Add a new connection to the list
 336 ********************************************************************/
 337
 338 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 339                                         struct cli_state *referring_cli,
 340                                         const char *server,
 341                                         const char *share,
 342                                         bool show_hdr,
 343                                         bool force_encrypt)
 344 {
 345         struct client_connection *node;
 346
 347         /* NB This must be the null context here... JRA. */
 348         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 349         if (!node) {
 350                 return NULL;
 351         }
 352
 353         node->cli = do_connect(ctx, server, share, show_hdr, force_encrypt);
 354
 355         if ( !node->cli ) {
 356                 TALLOC_FREE( node );
 357                 return NULL;
 358         }
 359
 360         DLIST_ADD( connections, node );
 361
 362         cli_cm_set_mntpoint(node->cli, "");
 363
 364         if (referring_cli && referring_cli->posix_capabilities) {
 365                 uint16 major, minor;
 366                 uint32 caplow, caphigh;
 367                 if (cli_unix_extensions_version(node->cli, &major,
 368                                         &minor, &caplow, &caphigh)) {
 369                         cli_set_unix_extensions_capabilities(node->cli,
 370                                         major, minor,
 371                                         caplow, caphigh);
 372                 }
 373         }
 374
 375         return node->cli;
 376 }
 377
 378 /********************************************************************
 379  Return a connection to a server.
 380 ********************************************************************/
 381
 382 static struct cli_state *cli_cm_find(const char *server, const char *share)
 383 {
 384         struct client_connection *p;
 385
 386         for (p=connections; p; p=p->next) {
 387                 if ( strequal(server, p->cli->desthost) &&
 388                                 strequal(share,p->cli->share)) {
 389                         return p->cli;
 390                 }
 391         }
 392
 393         return NULL;
 394 }
 395
 396 /****************************************************************************
 397  Open a client connection to a \\server\share.  Set's the current *cli
 398  global variable as a side-effect (but only if the connection is successful).
 399 ****************************************************************************/
 400
 401 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 402                                 struct cli_state *referring_cli,
 403                                 const char *server,
 404                                 const char *share,
 405                                 bool show_hdr,
 406                                 bool force_encrypt)
 407 {
 408         struct cli_state *c;
 409
 410         /* try to reuse an existing connection */
 411
 412         c = cli_cm_find(server, share);
 413         if (!c) {
 414                 c = cli_cm_connect(ctx, referring_cli,
 415                                 server, share, show_hdr, force_encrypt);
 416         }
 417
 418         return c;
 419 }
 420
 421 /****************************************************************************
 422 ****************************************************************************/
 423
 424 void cli_cm_shutdown(void)
 425 {
 426         struct client_connection *p, *x;
 427
 428         for (p=connections; p;) {
 429                 cli_shutdown(p->cli);
 430                 x = p;
 431                 p = p->next;
 432
 433                 TALLOC_FREE(x);
 434         }
 435
 436         connections = NULL;
 437         return;
 438 }
 439
 440 /****************************************************************************
 441 ****************************************************************************/
 442
 443 void cli_cm_display(void)
 444 {
 445         struct client_connection *p;
 446         int i;
 447
 448         for ( p=connections,i=0; p; p=p->next,i++ ) {
 449                 d_printf("%d:\tserver=%s, share=%s\n",
 450                         i, p->cli->desthost, p->cli->share );
 451         }
 452 }
 453
 454 /****************************************************************************
 455 ****************************************************************************/
 456
 457 static void cm_set_password(const char *newpass)
 458 {
 459         SAFE_FREE(cm_creds.password);
 460         cm_creds.password = SMB_STRDUP(newpass);
 461         if (cm_creds.password) {
 462                 cm_creds.got_pass = true;
 463         }
 464 }
 465
 466 /****************************************************************************
 467 ****************************************************************************/
 468
 469 void cli_cm_set_credentials(void)
 470 {
 471         SAFE_FREE(cm_creds.username);
 472         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username());
 473
 474         if (get_cmdline_auth_info_got_pass()) {
 475                 cm_set_password(get_cmdline_auth_info_password());
 476         }
 477
 478         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos();
 479         cm_creds.fallback_after_kerberos = false;
 480         cm_creds.signing_state = get_cmdline_auth_info_signing_state();
 481 }
 482
 483 /****************************************************************************
 484 ****************************************************************************/
 485
 486 void cli_cm_set_port(int port_number)
 487 {
 488         port = port_number;
 489 }
 490
 491 /****************************************************************************
 492 ****************************************************************************/
 493
 494 void cli_cm_set_dest_name_type(int type)
 495 {
 496         name_type = type;
 497 }
 498
 499 /****************************************************************************
 500 ****************************************************************************/
 501
 502 void cli_cm_set_signing_state(int state)
 503 {
 504         cm_creds.signing_state = state;
 505 }
 506
 507 /****************************************************************************
 508 ****************************************************************************/
 509
 510 void cli_cm_set_username(const char *username)
 511 {
 512         SAFE_FREE(cm_creds.username);
 513         cm_creds.username = SMB_STRDUP(username);
 514 }
 515
 516 /****************************************************************************
 517 ****************************************************************************/
 518
 519 void cli_cm_set_password(const char *newpass)
 520 {
 521         SAFE_FREE(cm_creds.password);
 522         cm_creds.password = SMB_STRDUP(newpass);
 523         if (cm_creds.password) {
 524                 cm_creds.got_pass = true;
 525         }
 526 }
 527
 528 /****************************************************************************
 529 ****************************************************************************/
 530
 531 void cli_cm_set_use_kerberos(void)
 532 {
 533         cm_creds.use_kerberos = true;
 534 }
 535
 536 /****************************************************************************
 537 ****************************************************************************/
 538
 539 void cli_cm_set_fallback_after_kerberos(void)
 540 {
 541         cm_creds.fallback_after_kerberos = true;
 542 }
 543
 544 /****************************************************************************
 545 ****************************************************************************/
 546
 547 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 548 {
 549         dest_ss = *pss;
 550         have_ip = true;
 551 }
 552
 553 /**********************************************************************
 554  split a dfs path into the server, share name, and extrapath components
 555 **********************************************************************/
 556
 557 static void split_dfs_path(TALLOC_CTX *ctx,
 558                                 const char *nodepath,
 559                                 char **pp_server,
 560                                 char **pp_share,
 561                                 char **pp_extrapath)
 562 {
 563         char *p, *q;
 564         char *path;
 565
 566         *pp_server = NULL;
 567         *pp_share = NULL;
 568         *pp_extrapath = NULL;
 569
 570         path = talloc_strdup(ctx, nodepath);
 571         if (!path) {
 572                 return;
 573         }
 574
 575         if ( path[0] != '\\' ) {
 576                 return;
 577         }
 578
 579         p = strchr_m( path + 1, '\\' );
 580         if ( !p ) {
 581                 return;
 582         }
 583
 584         *p = '\0';
 585         p++;
 586
 587         /* Look for any extra/deep path */
 588         q = strchr_m(p, '\\');
 589         if (q != NULL) {
 590                 *q = '\0';
 591                 q++;
 592                 *pp_extrapath = talloc_strdup(ctx, q);
 593         } else {
 594                 *pp_extrapath = talloc_strdup(ctx, "");
 595         }
 596
 597         *pp_share = talloc_strdup(ctx, p);
 598         *pp_server = talloc_strdup(ctx, &path[1]);
 599 }
 600
 601 /****************************************************************************
 602  Return the original path truncated at the directory component before
 603  the first wildcard character. Trust the caller to provide a NULL
 604  terminated string
 605 ****************************************************************************/
 606
 607 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 608 {
 609         size_t len;
 610         char *p1, *p2, *p;
 611         char *path_out;
 612
 613         /* No absolute paths. */
 614         while (IS_DIRECTORY_SEP(*path)) {
 615                 path++;
 616         }
 617
 618         path_out = talloc_strdup(ctx, path);
 619         if (!path_out) {
 620                 return NULL;
 621         }
 622
 623         p1 = strchr_m(path_out, '*');
 624         p2 = strchr_m(path_out, '?');
 625
 626         if (p1 || p2) {
 627                 if (p1 && p2) {
 628                         p = MIN(p1,p2);
 629                 } else if (!p1) {
 630                         p = p2;
 631                 } else {
 632                         p = p1;
 633                 }
 634                 *p = '\0';
 635
 636                 /* Now go back to the start of this component. */
 637                 p1 = strrchr_m(path_out, '/');
 638                 p2 = strrchr_m(path_out, '\\');
 639                 p = MAX(p1,p2);
 640                 if (p) {
 641                         *p = '\0';
 642                 }
 643         }
 644
 645         /* Strip any trailing separator */
 646
 647         len = strlen(path_out);
 648         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 649                 path_out[len-1] = '\0';
 650         }
 651
 652         return path_out;
 653 }
 654
 655 /****************************************************************************
 656 ****************************************************************************/
 657
 658 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 659                                         struct cli_state *cli,
 660                                         const char *dir)
 661 {
 662         /* Ensure the extrapath doesn't start with a separator. */
 663         while (IS_DIRECTORY_SEP(*dir)) {
 664                 dir++;
 665         }
 666
 667         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 668                         cli->desthost, cli->share, dir);
 669 }
 670
 671 /********************************************************************
 672  check for dfs referral
 673 ********************************************************************/
 674
 675 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 676 {
 677         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 678
 679         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 680
 681         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 682                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 683                 return false;
 684
 685         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 686                 return true;
 687
 688         return false;
 689 }
 690
 691 /********************************************************************
 692  Get the dfs referral link.
 693 ********************************************************************/
 694
 695 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 696                         struct cli_state *cli,
 697                         const char *path,
 698                         CLIENT_DFS_REFERRAL**refs,
 699                         size_t *num_refs,
 700                         uint16 *consumed)
 701 {
 702         unsigned int data_len = 0;
 703         unsigned int param_len = 0;
 704         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 705         char *param;
 706         char *rparam=NULL, *rdata=NULL;
 707         char *p;
 708         char *endp;
 709         size_t pathlen = 2*(strlen(path)+1);
 710         uint16 num_referrals;
 711         CLIENT_DFS_REFERRAL *referrals = NULL;
 712         bool ret = false;
 713
 714         *num_refs = 0;
 715         *refs = NULL;
 716
 717         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 718         if (!param) {
 719                 return false;
 720         }
 721         SSVAL(param, 0, 0x03);  /* max referral level */
 722         p = &param[2];
 723
 724         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 725         param_len = PTR_DIFF(p, param);
 726
 727         if (!cli_send_trans(cli, SMBtrans2,
 728                         NULL,                        /* name */
 729                         -1, 0,                          /* fid, flags */
 730                         &setup, 1, 0,                   /* setup, length, max */
 731                         param, param_len, 2,            /* param, length, max */
 732                         NULL, 0, cli->max_xmit /* data, length, max */
 733                         )) {
 734                 SAFE_FREE(param);
 735                 return false;
 736         }
 737
 738         SAFE_FREE(param);
 739
 740         if (!cli_receive_trans(cli, SMBtrans2,
 741                 &rparam, &param_len,
 742                 &rdata, &data_len)) {
 743                         return false;
 744         }
 745
 746         if (data_len < 4) {
 747                 goto out;
 748         }
 749
 750         endp = rdata + data_len;
 751
 752         *consumed     = SVAL(rdata, 0);
 753         num_referrals = SVAL(rdata, 2);
 754
 755         if (num_referrals != 0) {
 756                 uint16 ref_version;
 757                 uint16 ref_size;
 758                 int i;
 759                 uint16 node_offset;
 760
 761                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 762                                 num_referrals);
 763
 764                 if (!referrals) {
 765                         goto out;
 766                 }
 767                 /* start at the referrals array */
 768
 769                 p = rdata+8;
 770                 for (i=0; i<num_referrals && p < endp; i++) {
 771                         if (p + 18 > endp) {
 772                                 goto out;
 773                         }
 774                         ref_version = SVAL(p, 0);
 775                         ref_size    = SVAL(p, 2);
 776                         node_offset = SVAL(p, 16);
 777
 778                         if (ref_version != 3) {
 779                                 p += ref_size;
 780                                 continue;
 781                         }
 782
 783                         referrals[i].proximity = SVAL(p, 8);
 784                         referrals[i].ttl       = SVAL(p, 10);
 785
 786                         if (p + node_offset > endp) {
 787                                 goto out;
 788                         }
 789                         clistr_pull_talloc(ctx, cli, &referrals[i].dfspath,
 790                                 p+node_offset, -1,
 791                                 STR_TERMINATE|STR_UNICODE );
 792
 793                         if (!referrals[i].dfspath) {
 794                                 goto out;
 795                         }
 796                         p += ref_size;
 797                 }
 798                 if (i < num_referrals) {
 799                         goto out;
 800                 }
 801         }
 802
 803         ret = true;
 804
 805         *num_refs = num_referrals;
 806         *refs = referrals;
 807
 808   out:
 809
 810         SAFE_FREE(rdata);
 811         SAFE_FREE(rparam);
 812         return ret;
 813 }
 814
 815 /********************************************************************
 816 ********************************************************************/
 817
 818 bool cli_resolve_path(TALLOC_CTX *ctx,
 819                         const char *mountpt,
 820                         struct cli_state *rootcli,
 821                         const char *path,
 822                         struct cli_state **targetcli,
 823                         char **pp_targetpath)
 824 {
 825         CLIENT_DFS_REFERRAL *refs = NULL;
 826         size_t num_refs = 0;
 827         uint16 consumed;
 828         struct cli_state *cli_ipc = NULL;
 829         char *dfs_path = NULL;
 830         char *cleanpath = NULL;
 831         char *extrapath = NULL;
 832         int pathlen;
 833         char *server = NULL;
 834         char *share = NULL;
 835         struct cli_state *newcli = NULL;
 836         char *newpath = NULL;
 837         char *newmount = NULL;
 838         char *ppath = NULL;
 839         SMB_STRUCT_STAT sbuf;
 840         uint32 attributes;
 841
 842         if ( !rootcli || !path || !targetcli ) {
 843                 return false;
 844         }
 845
 846         /* Don't do anything if this is not a DFS root. */
 847
 848         if ( !rootcli->dfsroot) {
 849                 *targetcli = rootcli;
 850                 *pp_targetpath = talloc_strdup(ctx, path);
 851                 if (!*pp_targetpath) {
 852                         return false;
 853                 }
 854                 return true;
 855         }
 856
 857         *targetcli = NULL;
 858
 859         /* Send a trans2_query_path_info to check for a referral. */
 860
 861         cleanpath = clean_path(ctx, path);
 862         if (!cleanpath) {
 863                 return false;
 864         }
 865
 866         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 867         if (!dfs_path) {
 868                 return false;
 869         }
 870
 871         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 872                 /* This is an ordinary path, just return it. */
 873                 *targetcli = rootcli;
 874                 *pp_targetpath = talloc_strdup(ctx, path);
 875                 if (!*pp_targetpath) {
 876                         return false;
 877                 }
 878                 goto done;
 879         }
 880
 881         /* Special case where client asked for a path that does not exist */
 882
 883         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 884                 *targetcli = rootcli;
 885                 *pp_targetpath = talloc_strdup(ctx, path);
 886                 if (!*pp_targetpath) {
 887                         return false;
 888                 }
 889                 goto done;
 890         }
 891
 892         /* We got an error, check for DFS referral. */
 893
 894         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 895                 return false;
 896         }
 897
 898         /* Check for the referral. */
 899
 900         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 901                                         rootcli->desthost,
 902                                         "IPC$", false,
 903                                         (rootcli->trans_enc_state != NULL)))) {
 904                 return false;
 905         }
 906
 907         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 908                         &num_refs, &consumed) || !num_refs) {
 909                 return false;
 910         }
 911
 912         /* Just store the first referral for now. */
 913
 914         if (!refs[0].dfspath) {
 915                 return false;
 916         }
 917         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 918
 919         if (!server || !share) {
 920                 return false;
 921         }
 922
 923         /* Make sure to recreate the original string including any wildcards. */
 924
 925         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 926         if (!dfs_path) {
 927                 return false;
 928         }
 929         pathlen = strlen(dfs_path)*2;
 930         consumed = MIN(pathlen, consumed);
 931         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 932         if (!*pp_targetpath) {
 933                 return false;
 934         }
 935         dfs_path[consumed/2] = '\0';
 936
 937         /*
 938          * *pp_targetpath is now the unconsumed part of the path.
 939          * dfs_path is now the consumed part of the path
 940          * (in \server\share\path format).
 941          */
 942
 943         /* Open the connection to the target server & share */
 944         if ((*targetcli = cli_cm_open(ctx, rootcli,
 945                                         server,
 946                                         share,
 947                                         false,
 948                                         (rootcli->trans_enc_state != NULL))) == NULL) {
 949                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 950                         server, share );
 951                 return false;
 952         }
 953
 954         if (extrapath && strlen(extrapath) > 0) {
 955                 *pp_targetpath = talloc_asprintf(ctx,
 956                                                 "%s%s",
 957                                                 extrapath,
 958                                                 *pp_targetpath);
 959                 if (!*pp_targetpath) {
 960                         return false;
 961                 }
 962         }
 963
 964         /* parse out the consumed mount path */
 965         /* trim off the \server\share\ */
 966
 967         ppath = dfs_path;
 968
 969         if (*ppath != '\\') {
 970                 d_printf("cli_resolve_path: "
 971                         "dfs_path (%s) not in correct format.\n",
 972                         dfs_path );
 973                 return false;
 974         }
 975
 976         ppath++; /* Now pointing at start of server name. */
 977
 978         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 979                 return false;
 980         }
 981
 982         ppath++; /* Now pointing at start of share name. */
 983
 984         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 985                 return false;
 986         }
 987
 988         ppath++; /* Now pointing at path component. */
 989
 990         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 991         if (!newmount) {
 992                 return false;
 993         }
 994
 995         cli_cm_set_mntpoint(*targetcli, newmount);
 996
 997         /* Check for another dfs referral, note that we are not
 998            checking for loops here. */
 999
1000         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1001                 if (cli_resolve_path(ctx,
1002                                         newmount,
1003                                         *targetcli,
1004                                         *pp_targetpath,
1005                                         &newcli,
1006                                         &newpath)) {
1007                         /*
1008                          * When cli_resolve_path returns true here it's always
1009                          * returning the complete path in newpath, so we're done
1010                          * here.
1011                          */
1012                         *targetcli = newcli;
1013                         *pp_targetpath = newpath;
1014                         return true;
1015                 }
1016         }
1017
1018   done:
1019
1020         /* If returning true ensure we return a dfs root full path. */
1021         if ((*targetcli)->dfsroot) {
1022                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1023                 if (!dfs_path) {
1024                         return false;
1025                 }
1026                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1027         }
1028
1029         return true;
1030 }
1031
1032 /********************************************************************
1033 ********************************************************************/
1034
1035 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1036                                 struct cli_state *cli,
1037                                 const char *sharename,
1038                                 char **pp_newserver,
1039                                 char **pp_newshare,
1040                                 bool force_encrypt,
1041                                 const char *username,
1042                                 const char *password,
1043                                 const char *domain)
1044 {
1045         CLIENT_DFS_REFERRAL *refs = NULL;
1046         size_t num_refs = 0;
1047         uint16 consumed;
1048         char *fullpath = NULL;
1049         bool res;
1050         uint16 cnum;
1051         char *newextrapath = NULL;
1052
1053         if (!cli || !sharename) {
1054                 return false;
1055         }
1056
1057         cnum = cli->cnum;
1058
1059         /* special case.  never check for a referral on the IPC$ share */
1060
1061         if (strequal(sharename, "IPC$")) {
1062                 return false;
1063         }
1064
1065         /* send a trans2_query_path_info to check for a referral */
1066
1067         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1068         if (!fullpath) {
1069                 return false;
1070         }
1071
1072         /* check for the referral */
1073
1074         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
1075                 return false;
1076         }
1077
1078         if (force_encrypt) {
1079                 NTSTATUS status = cli_cm_force_encryption(cli,
1080                                         username,
1081                                         password,
1082                                         lp_workgroup(),
1083                                         "IPC$");
1084                 if (!NT_STATUS_IS_OK(status)) {
1085                         return false;
1086                 }
1087         }
1088
1089         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1090
1091         if (!cli_tdis(cli)) {
1092                 return false;
1093         }
1094
1095         cli->cnum = cnum;
1096
1097         if (!res || !num_refs) {
1098                 return false;
1099         }
1100
1101         if (!refs[0].dfspath) {
1102                 return false;
1103         }
1104
1105         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1106                         pp_newshare, &newextrapath );
1107
1108         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1109                 return false;
1110         }
1111
1112         /* check that this is not a self-referral */
1113
1114         if (strequal(cli->desthost, *pp_newserver) &&
1115                         strequal(sharename, *pp_newshare)) {
1116                 return false;
1117         }
1118
1119         return true;
1120 }