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