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, mnt);
 312                 if (!name) {
 313                         return;
 314                 }
 315                 TALLOC_FREE(p->mount);
 316                 p->mount = talloc_strdup(p, name);
 317                 TALLOC_FREE(name);
 318         }
 319 }
 320
 321 /****************************************************************************
 322 ****************************************************************************/
 323
 324 const char *cli_cm_get_mntpoint(struct cli_state *c)
 325 {
 326         struct client_connection *p;
 327         int i;
 328
 329         for (p=connections,i=0; p; p=p->next,i++) {
 330                 if (strequal(p->cli->desthost, c->desthost) &&
 331                                 strequal(p->cli->share, c->share)) {
 332                         break;
 333                 }
 334         }
 335
 336         if (p) {
 337                 return p->mount;
 338         }
 339         return NULL;
 340 }
 341
 342 /********************************************************************
 343  Add a new connection to the list
 344 ********************************************************************/
 345
 346 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 347                                         struct cli_state *referring_cli,
 348                                         const char *server,
 349                                         const char *share,
 350                                         bool show_hdr,
 351                                         bool force_encrypt)
 352 {
 353         struct client_connection *node;
 354
 355         /* NB This must be the null context here... JRA. */
 356         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 357         if (!node) {
 358                 return NULL;
 359         }
 360
 361         node->cli = do_connect(ctx, server, share, show_hdr, force_encrypt);
 362
 363         if ( !node->cli ) {
 364                 TALLOC_FREE( node );
 365                 return NULL;
 366         }
 367
 368         DLIST_ADD( connections, node );
 369
 370         cli_cm_set_mntpoint(node->cli, "");
 371
 372         if (referring_cli && referring_cli->posix_capabilities) {
 373                 uint16 major, minor;
 374                 uint32 caplow, caphigh;
 375                 if (cli_unix_extensions_version(node->cli, &major,
 376                                         &minor, &caplow, &caphigh)) {
 377                         cli_set_unix_extensions_capabilities(node->cli,
 378                                         major, minor,
 379                                         caplow, caphigh);
 380                 }
 381         }
 382
 383         return node->cli;
 384 }
 385
 386 /********************************************************************
 387  Return a connection to a server.
 388 ********************************************************************/
 389
 390 static struct cli_state *cli_cm_find(const char *server, const char *share)
 391 {
 392         struct client_connection *p;
 393
 394         for (p=connections; p; p=p->next) {
 395                 if ( strequal(server, p->cli->desthost) &&
 396                                 strequal(share,p->cli->share)) {
 397                         return p->cli;
 398                 }
 399         }
 400
 401         return NULL;
 402 }
 403
 404 /****************************************************************************
 405  Open a client connection to a \\server\share.  Set's the current *cli
 406  global variable as a side-effect (but only if the connection is successful).
 407 ****************************************************************************/
 408
 409 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 410                                 struct cli_state *referring_cli,
 411                                 const char *server,
 412                                 const char *share,
 413                                 bool show_hdr,
 414                                 bool force_encrypt)
 415 {
 416         struct cli_state *c;
 417
 418         /* try to reuse an existing connection */
 419
 420         c = cli_cm_find(server, share);
 421         if (!c) {
 422                 c = cli_cm_connect(ctx, referring_cli,
 423                                 server, share, show_hdr, force_encrypt);
 424         }
 425
 426         return c;
 427 }
 428
 429 /****************************************************************************
 430 ****************************************************************************/
 431
 432 void cli_cm_shutdown(void)
 433 {
 434         struct client_connection *p, *x;
 435
 436         for (p=connections; p;) {
 437                 cli_shutdown(p->cli);
 438                 x = p;
 439                 p = p->next;
 440
 441                 TALLOC_FREE(x);
 442         }
 443
 444         connections = NULL;
 445         return;
 446 }
 447
 448 /****************************************************************************
 449 ****************************************************************************/
 450
 451 void cli_cm_display(void)
 452 {
 453         struct client_connection *p;
 454         int i;
 455
 456         for ( p=connections,i=0; p; p=p->next,i++ ) {
 457                 d_printf("%d:\tserver=%s, share=%s\n",
 458                         i, p->cli->desthost, p->cli->share );
 459         }
 460 }
 461
 462 /****************************************************************************
 463 ****************************************************************************/
 464
 465 static void cm_set_password(const char *newpass)
 466 {
 467         SAFE_FREE(cm_creds.password);
 468         cm_creds.password = SMB_STRDUP(newpass);
 469         if (cm_creds.password) {
 470                 cm_creds.got_pass = true;
 471         }
 472 }
 473
 474 /****************************************************************************
 475 ****************************************************************************/
 476
 477 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 478 {
 479         SAFE_FREE(cm_creds.username);
 480         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 481                                                auth_info));
 482
 483         if (get_cmdline_auth_info_got_pass(auth_info)) {
 484                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 485         }
 486
 487         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 488         cm_creds.fallback_after_kerberos = false;
 489         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 490 }
 491
 492 /****************************************************************************
 493 ****************************************************************************/
 494
 495 void cli_cm_set_port(int port_number)
 496 {
 497         port = port_number;
 498 }
 499
 500 /****************************************************************************
 501 ****************************************************************************/
 502
 503 void cli_cm_set_dest_name_type(int type)
 504 {
 505         name_type = type;
 506 }
 507
 508 /****************************************************************************
 509 ****************************************************************************/
 510
 511 void cli_cm_set_signing_state(int state)
 512 {
 513         cm_creds.signing_state = state;
 514 }
 515
 516 /****************************************************************************
 517 ****************************************************************************/
 518
 519 void cli_cm_set_username(const char *username)
 520 {
 521         SAFE_FREE(cm_creds.username);
 522         cm_creds.username = SMB_STRDUP(username);
 523 }
 524
 525 /****************************************************************************
 526 ****************************************************************************/
 527
 528 void cli_cm_set_password(const char *newpass)
 529 {
 530         SAFE_FREE(cm_creds.password);
 531         cm_creds.password = SMB_STRDUP(newpass);
 532         if (cm_creds.password) {
 533                 cm_creds.got_pass = true;
 534         }
 535 }
 536
 537 /****************************************************************************
 538 ****************************************************************************/
 539
 540 void cli_cm_set_use_kerberos(void)
 541 {
 542         cm_creds.use_kerberos = true;
 543 }
 544
 545 /****************************************************************************
 546 ****************************************************************************/
 547
 548 void cli_cm_set_fallback_after_kerberos(void)
 549 {
 550         cm_creds.fallback_after_kerberos = 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 }