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_sockaddr(&ss);
 148
 149         make_nmb_name(&calling, global_myname(), 0x0);
 150         make_nmb_name(&called , server, name_type);
 151
 152  again:
 153         zero_sockaddr(&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 *label = NULL;
 206                 char *pass;
 207                 label = talloc_asprintf(ctx, "Enter %s's password: ",
 208                         cm_creds.username);
 209                 pass = getpass(label);
 210                 if (pass) {
 211                         cm_set_password(pass);
 212                 }
 213                 TALLOC_FREE(label);
 214         }
 215
 216         username = cm_creds.username ? cm_creds.username : "";
 217         password = cm_creds.password ? cm_creds.password : "";
 218
 219         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 220                                                password, strlen(password),
 221                                                password, strlen(password),
 222                                                lp_workgroup()))) {
 223                 /* If a password was not supplied then
 224                  * try again with a null username. */
 225                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 226                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 227                                                 "", 0,
 228                                                 "", 0,
 229                                                lp_workgroup()))) {
 230                         d_printf("session setup failed: %s\n", cli_errstr(c));
 231                         if (NT_STATUS_V(cli_nt_error(c)) ==
 232                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 233                                 d_printf("did you forget to run kinit?\n");
 234                         cli_shutdown(c);
 235                         return NULL;
 236                 }
 237                 d_printf("Anonymous login successful\n");
 238         }
 239
 240         if ( show_sessetup ) {
 241                 if (*c->server_domain) {
 242                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 243                                 c->server_domain,c->server_os,c->server_type));
 244                 } else if (*c->server_os || *c->server_type) {
 245                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 246                                  c->server_os,c->server_type));
 247                 }
 248         }
 249         DEBUG(4,(" session setup ok\n"));
 250
 251         /* here's the fun part....to support 'msdfs proxy' shares
 252            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 253            here before trying to connect to the original share.
 254            check_dfs_proxy() will fail if it is a normal share. */
 255
 256         if ((c->capabilities & CAP_DFS) &&
 257                         cli_check_msdfs_proxy(ctx, c, sharename,
 258                                 &newserver, &newshare,
 259                                 force_encrypt,
 260                                 username,
 261                                 password,
 262                                 lp_workgroup())) {
 263                 cli_shutdown(c);
 264                 return do_connect(ctx, newserver,
 265                                 newshare, false, force_encrypt);
 266         }
 267
 268         /* must be a normal share */
 269
 270         if (!cli_send_tconX(c, sharename, "?????",
 271                                 password, strlen(password)+1)) {
 272                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 273                 cli_shutdown(c);
 274                 return NULL;
 275         }
 276
 277         if (force_encrypt) {
 278                 status = cli_cm_force_encryption(c,
 279                                         username,
 280                                         password,
 281                                         lp_workgroup(),
 282                                         sharename);
 283                 if (!NT_STATUS_IS_OK(status)) {
 284                         cli_shutdown(c);
 285                         return NULL;
 286                 }
 287         }
 288
 289         DEBUG(4,(" tconx ok\n"));
 290         return c;
 291 }
 292
 293 /****************************************************************************
 294 ****************************************************************************/
 295
 296 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 297 {
 298         struct client_connection *p;
 299         int i;
 300
 301         for (p=connections,i=0; p; p=p->next,i++) {
 302                 if (strequal(p->cli->desthost, c->desthost) &&
 303                                 strequal(p->cli->share, c->share)) {
 304                         break;
 305                 }
 306         }
 307
 308         if (p) {
 309                 char *name = clean_name(NULL, p->mount);
 310                 if (!name) {
 311                         return;
 312                 }
 313                 p->mount = talloc_strdup(p, name);
 314                 TALLOC_FREE(name);
 315         }
 316 }
 317
 318 /****************************************************************************
 319 ****************************************************************************/
 320
 321 const char *cli_cm_get_mntpoint(struct cli_state *c)
 322 {
 323         struct client_connection *p;
 324         int i;
 325
 326         for (p=connections,i=0; p; p=p->next,i++) {
 327                 if (strequal(p->cli->desthost, c->desthost) &&
 328                                 strequal(p->cli->share, c->share)) {
 329                         break;
 330                 }
 331         }
 332
 333         if (p) {
 334                 return p->mount;
 335         }
 336         return NULL;
 337 }
 338
 339 /********************************************************************
 340  Add a new connection to the list
 341 ********************************************************************/
 342
 343 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 344                                         struct cli_state *referring_cli,
 345                                         const char *server,
 346                                         const char *share,
 347                                         bool show_hdr,
 348                                         bool force_encrypt)
 349 {
 350         struct client_connection *node;
 351
 352         /* NB This must be the null context here... JRA. */
 353         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 354         if (!node) {
 355                 return NULL;
 356         }
 357
 358         node->cli = do_connect(ctx, server, share, show_hdr, force_encrypt);
 359
 360         if ( !node->cli ) {
 361                 TALLOC_FREE( node );
 362                 return NULL;
 363         }
 364
 365         DLIST_ADD( connections, node );
 366
 367         cli_cm_set_mntpoint(node->cli, "");
 368
 369         if (referring_cli && referring_cli->posix_capabilities) {
 370                 uint16 major, minor;
 371                 uint32 caplow, caphigh;
 372                 if (cli_unix_extensions_version(node->cli, &major,
 373                                         &minor, &caplow, &caphigh)) {
 374                         cli_set_unix_extensions_capabilities(node->cli,
 375                                         major, minor,
 376                                         caplow, caphigh);
 377                 }
 378         }
 379
 380         return node->cli;
 381 }
 382
 383 /********************************************************************
 384  Return a connection to a server.
 385 ********************************************************************/
 386
 387 static struct cli_state *cli_cm_find(const char *server, const char *share)
 388 {
 389         struct client_connection *p;
 390
 391         for (p=connections; p; p=p->next) {
 392                 if ( strequal(server, p->cli->desthost) &&
 393                                 strequal(share,p->cli->share)) {
 394                         return p->cli;
 395                 }
 396         }
 397
 398         return NULL;
 399 }
 400
 401 /****************************************************************************
 402  Open a client connection to a \\server\share.  Set's the current *cli
 403  global variable as a side-effect (but only if the connection is successful).
 404 ****************************************************************************/
 405
 406 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 407                                 struct cli_state *referring_cli,
 408                                 const char *server,
 409                                 const char *share,
 410                                 bool show_hdr,
 411                                 bool force_encrypt)
 412 {
 413         struct cli_state *c;
 414
 415         /* try to reuse an existing connection */
 416
 417         c = cli_cm_find(server, share);
 418         if (!c) {
 419                 c = cli_cm_connect(ctx, referring_cli,
 420                                 server, share, show_hdr, force_encrypt);
 421         }
 422
 423         return c;
 424 }
 425
 426 /****************************************************************************
 427 ****************************************************************************/
 428
 429 void cli_cm_shutdown(void)
 430 {
 431         struct client_connection *p, *x;
 432
 433         for (p=connections; p;) {
 434                 cli_shutdown(p->cli);
 435                 x = p;
 436                 p = p->next;
 437
 438                 TALLOC_FREE(x);
 439         }
 440
 441         connections = NULL;
 442         return;
 443 }
 444
 445 /****************************************************************************
 446 ****************************************************************************/
 447
 448 void cli_cm_display(void)
 449 {
 450         struct client_connection *p;
 451         int i;
 452
 453         for ( p=connections,i=0; p; p=p->next,i++ ) {
 454                 d_printf("%d:\tserver=%s, share=%s\n",
 455                         i, p->cli->desthost, p->cli->share );
 456         }
 457 }
 458
 459 /****************************************************************************
 460 ****************************************************************************/
 461
 462 static void cm_set_password(const char *newpass)
 463 {
 464         SAFE_FREE(cm_creds.password);
 465         cm_creds.password = SMB_STRDUP(newpass);
 466         if (cm_creds.password) {
 467                 cm_creds.got_pass = true;
 468         }
 469 }
 470
 471 /****************************************************************************
 472 ****************************************************************************/
 473
 474 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 475 {
 476         SAFE_FREE(cm_creds.username);
 477         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 478                                                auth_info));
 479
 480         if (get_cmdline_auth_info_got_pass(auth_info)) {
 481                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 482         }
 483
 484         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 485         cm_creds.fallback_after_kerberos = false;
 486         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 487 }
 488
 489 /****************************************************************************
 490 ****************************************************************************/
 491
 492 void cli_cm_set_port(int port_number)
 493 {
 494         port = port_number;
 495 }
 496
 497 /****************************************************************************
 498 ****************************************************************************/
 499
 500 void cli_cm_set_dest_name_type(int type)
 501 {
 502         name_type = type;
 503 }
 504
 505 /****************************************************************************
 506 ****************************************************************************/
 507
 508 void cli_cm_set_signing_state(int state)
 509 {
 510         cm_creds.signing_state = state;
 511 }
 512
 513 /****************************************************************************
 514 ****************************************************************************/
 515
 516 void cli_cm_set_username(const char *username)
 517 {
 518         SAFE_FREE(cm_creds.username);
 519         cm_creds.username = SMB_STRDUP(username);
 520 }
 521
 522 /****************************************************************************
 523 ****************************************************************************/
 524
 525 void cli_cm_set_password(const char *newpass)
 526 {
 527         SAFE_FREE(cm_creds.password);
 528         cm_creds.password = SMB_STRDUP(newpass);
 529         if (cm_creds.password) {
 530                 cm_creds.got_pass = true;
 531         }
 532 }
 533
 534 /****************************************************************************
 535 ****************************************************************************/
 536
 537 void cli_cm_set_use_kerberos(void)
 538 {
 539         cm_creds.use_kerberos = true;
 540 }
 541
 542 /****************************************************************************
 543 ****************************************************************************/
 544
 545 void cli_cm_set_fallback_after_kerberos(void)
 546 {
 547         cm_creds.fallback_after_kerberos = true;
 548 }
 549
 550 /****************************************************************************
 551 ****************************************************************************/
 552
 553 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 554 {
 555         dest_ss = *pss;
 556         have_ip = true;
 557 }
 558
 559 /**********************************************************************
 560  split a dfs path into the server, share name, and extrapath components
 561 **********************************************************************/
 562
 563 static void split_dfs_path(TALLOC_CTX *ctx,
 564                                 const char *nodepath,
 565                                 char **pp_server,
 566                                 char **pp_share,
 567                                 char **pp_extrapath)
 568 {
 569         char *p, *q;
 570         char *path;
 571
 572         *pp_server = NULL;
 573         *pp_share = NULL;
 574         *pp_extrapath = NULL;
 575
 576         path = talloc_strdup(ctx, nodepath);
 577         if (!path) {
 578                 return;
 579         }
 580
 581         if ( path[0] != '\\' ) {
 582                 return;
 583         }
 584
 585         p = strchr_m( path + 1, '\\' );
 586         if ( !p ) {
 587                 return;
 588         }
 589
 590         *p = '\0';
 591         p++;
 592
 593         /* Look for any extra/deep path */
 594         q = strchr_m(p, '\\');
 595         if (q != NULL) {
 596                 *q = '\0';
 597                 q++;
 598                 *pp_extrapath = talloc_strdup(ctx, q);
 599         } else {
 600                 *pp_extrapath = talloc_strdup(ctx, "");
 601         }
 602
 603         *pp_share = talloc_strdup(ctx, p);
 604         *pp_server = talloc_strdup(ctx, &path[1]);
 605 }
 606
 607 /****************************************************************************
 608  Return the original path truncated at the directory component before
 609  the first wildcard character. Trust the caller to provide a NULL
 610  terminated string
 611 ****************************************************************************/
 612
 613 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 614 {
 615         size_t len;
 616         char *p1, *p2, *p;
 617         char *path_out;
 618
 619         /* No absolute paths. */
 620         while (IS_DIRECTORY_SEP(*path)) {
 621                 path++;
 622         }
 623
 624         path_out = talloc_strdup(ctx, path);
 625         if (!path_out) {
 626                 return NULL;
 627         }
 628
 629         p1 = strchr_m(path_out, '*');
 630         p2 = strchr_m(path_out, '?');
 631
 632         if (p1 || p2) {
 633                 if (p1 && p2) {
 634                         p = MIN(p1,p2);
 635                 } else if (!p1) {
 636                         p = p2;
 637                 } else {
 638                         p = p1;
 639                 }
 640                 *p = '\0';
 641
 642                 /* Now go back to the start of this component. */
 643                 p1 = strrchr_m(path_out, '/');
 644                 p2 = strrchr_m(path_out, '\\');
 645                 p = MAX(p1,p2);
 646                 if (p) {
 647                         *p = '\0';
 648                 }
 649         }
 650
 651         /* Strip any trailing separator */
 652
 653         len = strlen(path_out);
 654         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 655                 path_out[len-1] = '\0';
 656         }
 657
 658         return path_out;
 659 }
 660
 661 /****************************************************************************
 662 ****************************************************************************/
 663
 664 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 665                                         struct cli_state *cli,
 666                                         const char *dir)
 667 {
 668         /* Ensure the extrapath doesn't start with a separator. */
 669         while (IS_DIRECTORY_SEP(*dir)) {
 670                 dir++;
 671         }
 672
 673         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 674                         cli->desthost, cli->share, dir);
 675 }
 676
 677 /********************************************************************
 678  check for dfs referral
 679 ********************************************************************/
 680
 681 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 682 {
 683         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 684
 685         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 686
 687         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 688                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 689                 return false;
 690
 691         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 692                 return true;
 693
 694         return false;
 695 }
 696
 697 /********************************************************************
 698  Get the dfs referral link.
 699 ********************************************************************/
 700
 701 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 702                         struct cli_state *cli,
 703                         const char *path,
 704                         CLIENT_DFS_REFERRAL**refs,
 705                         size_t *num_refs,
 706                         uint16 *consumed)
 707 {
 708         unsigned int data_len = 0;
 709         unsigned int param_len = 0;
 710         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 711         char *param;
 712         char *rparam=NULL, *rdata=NULL;
 713         char *p;
 714         char *endp;
 715         size_t pathlen = 2*(strlen(path)+1);
 716         uint16 num_referrals;
 717         CLIENT_DFS_REFERRAL *referrals = NULL;
 718         bool ret = false;
 719
 720         *num_refs = 0;
 721         *refs = NULL;
 722
 723         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 724         if (!param) {
 725                 return false;
 726         }
 727         SSVAL(param, 0, 0x03);  /* max referral level */
 728         p = &param[2];
 729
 730         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 731         param_len = PTR_DIFF(p, param);
 732
 733         if (!cli_send_trans(cli, SMBtrans2,
 734                         NULL,                        /* name */
 735                         -1, 0,                          /* fid, flags */
 736                         &setup, 1, 0,                   /* setup, length, max */
 737                         param, param_len, 2,            /* param, length, max */
 738                         NULL, 0, cli->max_xmit /* data, length, max */
 739                         )) {
 740                 SAFE_FREE(param);
 741                 return false;
 742         }
 743
 744         SAFE_FREE(param);
 745
 746         if (!cli_receive_trans(cli, SMBtrans2,
 747                 &rparam, &param_len,
 748                 &rdata, &data_len)) {
 749                         return false;
 750         }
 751
 752         if (data_len < 4) {
 753                 goto out;
 754         }
 755
 756         endp = rdata + data_len;
 757
 758         *consumed     = SVAL(rdata, 0);
 759         num_referrals = SVAL(rdata, 2);
 760
 761         if (num_referrals != 0) {
 762                 uint16 ref_version;
 763                 uint16 ref_size;
 764                 int i;
 765                 uint16 node_offset;
 766
 767                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 768                                 num_referrals);
 769
 770                 if (!referrals) {
 771                         goto out;
 772                 }
 773                 /* start at the referrals array */
 774
 775                 p = rdata+8;
 776                 for (i=0; i<num_referrals && p < endp; i++) {
 777                         if (p + 18 > endp) {
 778                                 goto out;
 779                         }
 780                         ref_version = SVAL(p, 0);
 781                         ref_size    = SVAL(p, 2);
 782                         node_offset = SVAL(p, 16);
 783
 784                         if (ref_version != 3) {
 785                                 p += ref_size;
 786                                 continue;
 787                         }
 788
 789                         referrals[i].proximity = SVAL(p, 8);
 790                         referrals[i].ttl       = SVAL(p, 10);
 791
 792                         if (p + node_offset > endp) {
 793                                 goto out;
 794                         }
 795                         clistr_pull_talloc(ctx, cli, &referrals[i].dfspath,
 796                                 p+node_offset, -1,
 797                                 STR_TERMINATE|STR_UNICODE );
 798
 799                         if (!referrals[i].dfspath) {
 800                                 goto out;
 801                         }
 802                         p += ref_size;
 803                 }
 804                 if (i < num_referrals) {
 805                         goto out;
 806                 }
 807         }
 808
 809         ret = true;
 810
 811         *num_refs = num_referrals;
 812         *refs = referrals;
 813
 814   out:
 815
 816         SAFE_FREE(rdata);
 817         SAFE_FREE(rparam);
 818         return ret;
 819 }
 820
 821 /********************************************************************
 822 ********************************************************************/
 823
 824 bool cli_resolve_path(TALLOC_CTX *ctx,
 825                         const char *mountpt,
 826                         struct cli_state *rootcli,
 827                         const char *path,
 828                         struct cli_state **targetcli,
 829                         char **pp_targetpath)
 830 {
 831         CLIENT_DFS_REFERRAL *refs = NULL;
 832         size_t num_refs = 0;
 833         uint16 consumed;
 834         struct cli_state *cli_ipc = NULL;
 835         char *dfs_path = NULL;
 836         char *cleanpath = NULL;
 837         char *extrapath = NULL;
 838         int pathlen;
 839         char *server = NULL;
 840         char *share = NULL;
 841         struct cli_state *newcli = NULL;
 842         char *newpath = NULL;
 843         char *newmount = NULL;
 844         char *ppath = NULL;
 845         SMB_STRUCT_STAT sbuf;
 846         uint32 attributes;
 847
 848         if ( !rootcli || !path || !targetcli ) {
 849                 return false;
 850         }
 851
 852         /* Don't do anything if this is not a DFS root. */
 853
 854         if ( !rootcli->dfsroot) {
 855                 *targetcli = rootcli;
 856                 *pp_targetpath = talloc_strdup(ctx, path);
 857                 if (!*pp_targetpath) {
 858                         return false;
 859                 }
 860                 return true;
 861         }
 862
 863         *targetcli = NULL;
 864
 865         /* Send a trans2_query_path_info to check for a referral. */
 866
 867         cleanpath = clean_path(ctx, path);
 868         if (!cleanpath) {
 869                 return false;
 870         }
 871
 872         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 873         if (!dfs_path) {
 874                 return false;
 875         }
 876
 877         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 878                 /* This is an ordinary path, just return it. */
 879                 *targetcli = rootcli;
 880                 *pp_targetpath = talloc_strdup(ctx, path);
 881                 if (!*pp_targetpath) {
 882                         return false;
 883                 }
 884                 goto done;
 885         }
 886
 887         /* Special case where client asked for a path that does not exist */
 888
 889         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 890                 *targetcli = rootcli;
 891                 *pp_targetpath = talloc_strdup(ctx, path);
 892                 if (!*pp_targetpath) {
 893                         return false;
 894                 }
 895                 goto done;
 896         }
 897
 898         /* We got an error, check for DFS referral. */
 899
 900         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 901                 return false;
 902         }
 903
 904         /* Check for the referral. */
 905
 906         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 907                                         rootcli->desthost,
 908                                         "IPC$", false,
 909                                         (rootcli->trans_enc_state != NULL)))) {
 910                 return false;
 911         }
 912
 913         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 914                         &num_refs, &consumed) || !num_refs) {
 915                 return false;
 916         }
 917
 918         /* Just store the first referral for now. */
 919
 920         if (!refs[0].dfspath) {
 921                 return false;
 922         }
 923         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 924
 925         if (!server || !share) {
 926                 return false;
 927         }
 928
 929         /* Make sure to recreate the original string including any wildcards. */
 930
 931         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 932         if (!dfs_path) {
 933                 return false;
 934         }
 935         pathlen = strlen(dfs_path)*2;
 936         consumed = MIN(pathlen, consumed);
 937         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 938         if (!*pp_targetpath) {
 939                 return false;
 940         }
 941         dfs_path[consumed/2] = '\0';
 942
 943         /*
 944          * *pp_targetpath is now the unconsumed part of the path.
 945          * dfs_path is now the consumed part of the path
 946          * (in \server\share\path format).
 947          */
 948
 949         /* Open the connection to the target server & share */
 950         if ((*targetcli = cli_cm_open(ctx, rootcli,
 951                                         server,
 952                                         share,
 953                                         false,
 954                                         (rootcli->trans_enc_state != NULL))) == NULL) {
 955                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 956                         server, share );
 957                 return false;
 958         }
 959
 960         if (extrapath && strlen(extrapath) > 0) {
 961                 *pp_targetpath = talloc_asprintf(ctx,
 962                                                 "%s%s",
 963                                                 extrapath,
 964                                                 *pp_targetpath);
 965                 if (!*pp_targetpath) {
 966                         return false;
 967                 }
 968         }
 969
 970         /* parse out the consumed mount path */
 971         /* trim off the \server\share\ */
 972
 973         ppath = dfs_path;
 974
 975         if (*ppath != '\\') {
 976                 d_printf("cli_resolve_path: "
 977                         "dfs_path (%s) not in correct format.\n",
 978                         dfs_path );
 979                 return false;
 980         }
 981
 982         ppath++; /* Now pointing at start of server name. */
 983
 984         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 985                 return false;
 986         }
 987
 988         ppath++; /* Now pointing at start of share name. */
 989
 990         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 991                 return false;
 992         }
 993
 994         ppath++; /* Now pointing at path component. */
 995
 996         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 997         if (!newmount) {
 998                 return false;
 999         }
1000
1001         cli_cm_set_mntpoint(*targetcli, newmount);
1002
1003         /* Check for another dfs referral, note that we are not
1004            checking for loops here. */
1005
1006         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1007                 if (cli_resolve_path(ctx,
1008                                         newmount,
1009                                         *targetcli,
1010                                         *pp_targetpath,
1011                                         &newcli,
1012                                         &newpath)) {
1013                         /*
1014                          * When cli_resolve_path returns true here it's always
1015                          * returning the complete path in newpath, so we're done
1016                          * here.
1017                          */
1018                         *targetcli = newcli;
1019                         *pp_targetpath = newpath;
1020                         return true;
1021                 }
1022         }
1023
1024   done:
1025
1026         /* If returning true ensure we return a dfs root full path. */
1027         if ((*targetcli)->dfsroot) {
1028                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1029                 if (!dfs_path) {
1030                         return false;
1031                 }
1032                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1033         }
1034
1035         return true;
1036 }
1037
1038 /********************************************************************
1039 ********************************************************************/
1040
1041 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1042                                 struct cli_state *cli,
1043                                 const char *sharename,
1044                                 char **pp_newserver,
1045                                 char **pp_newshare,
1046                                 bool force_encrypt,
1047                                 const char *username,
1048                                 const char *password,
1049                                 const char *domain)
1050 {
1051         CLIENT_DFS_REFERRAL *refs = NULL;
1052         size_t num_refs = 0;
1053         uint16 consumed;
1054         char *fullpath = NULL;
1055         bool res;
1056         uint16 cnum;
1057         char *newextrapath = NULL;
1058
1059         if (!cli || !sharename) {
1060                 return false;
1061         }
1062
1063         cnum = cli->cnum;
1064
1065         /* special case.  never check for a referral on the IPC$ share */
1066
1067         if (strequal(sharename, "IPC$")) {
1068                 return false;
1069         }
1070
1071         /* send a trans2_query_path_info to check for a referral */
1072
1073         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1074         if (!fullpath) {
1075                 return false;
1076         }
1077
1078         /* check for the referral */
1079
1080         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
1081                 return false;
1082         }
1083
1084         if (force_encrypt) {
1085                 NTSTATUS status = cli_cm_force_encryption(cli,
1086                                         username,
1087                                         password,
1088                                         lp_workgroup(),
1089                                         "IPC$");
1090                 if (!NT_STATUS_IS_OK(status)) {
1091                         return false;
1092                 }
1093         }
1094
1095         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1096
1097         if (!cli_tdis(cli)) {
1098                 return false;
1099         }
1100
1101         cli->cnum = cnum;
1102
1103         if (!res || !num_refs) {
1104                 return false;
1105         }
1106
1107         if (!refs[0].dfspath) {
1108                 return false;
1109         }
1110
1111         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1112                         pp_newshare, &newextrapath );
1113
1114         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1115                 return false;
1116         }
1117
1118         /* check that this is not a self-referral */
1119
1120         if (strequal(cli->desthost, *pp_newserver) &&
1121                         strequal(sharename, *pp_newshare)) {
1122                 return false;
1123         }
1124
1125         return true;
1126 }