source/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, mnt);
 310                 if (!name) {
 311                         return;
 312                 }
 313                 TALLOC_FREE(p->mount);
 314                 p->mount = talloc_strdup(p, name);
 315                 TALLOC_FREE(name);
 316         }
 317 }
 318
 319 /****************************************************************************
 320 ****************************************************************************/
 321
 322 const char *cli_cm_get_mntpoint(struct cli_state *c)
 323 {
 324         struct client_connection *p;
 325         int i;
 326
 327         for (p=connections,i=0; p; p=p->next,i++) {
 328                 if (strequal(p->cli->desthost, c->desthost) &&
 329                                 strequal(p->cli->share, c->share)) {
 330                         break;
 331                 }
 332         }
 333
 334         if (p) {
 335                 return p->mount;
 336         }
 337         return NULL;
 338 }
 339
 340 /********************************************************************
 341  Add a new connection to the list
 342 ********************************************************************/
 343
 344 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 345                                         struct cli_state *referring_cli,
 346                                         const char *server,
 347                                         const char *share,
 348                                         bool show_hdr,
 349                                         bool force_encrypt)
 350 {
 351         struct client_connection *node;
 352
 353         /* NB This must be the null context here... JRA. */
 354         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 355         if (!node) {
 356                 return NULL;
 357         }
 358
 359         node->cli = do_connect(ctx, server, share, show_hdr, force_encrypt);
 360
 361         if ( !node->cli ) {
 362                 TALLOC_FREE( node );
 363                 return NULL;
 364         }
 365
 366         DLIST_ADD( connections, node );
 367
 368         cli_cm_set_mntpoint(node->cli, "");
 369
 370         if (referring_cli && referring_cli->posix_capabilities) {
 371                 uint16 major, minor;
 372                 uint32 caplow, caphigh;
 373                 if (cli_unix_extensions_version(node->cli, &major,
 374                                         &minor, &caplow, &caphigh)) {
 375                         cli_set_unix_extensions_capabilities(node->cli,
 376                                         major, minor,
 377                                         caplow, caphigh);
 378                 }
 379         }
 380
 381         return node->cli;
 382 }
 383
 384 /********************************************************************
 385  Return a connection to a server.
 386 ********************************************************************/
 387
 388 static struct cli_state *cli_cm_find(const char *server, const char *share)
 389 {
 390         struct client_connection *p;
 391
 392         for (p=connections; p; p=p->next) {
 393                 if ( strequal(server, p->cli->desthost) &&
 394                                 strequal(share,p->cli->share)) {
 395                         return p->cli;
 396                 }
 397         }
 398
 399         return NULL;
 400 }
 401
 402 /****************************************************************************
 403  Open a client connection to a \\server\share.  Set's the current *cli
 404  global variable as a side-effect (but only if the connection is successful).
 405 ****************************************************************************/
 406
 407 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 408                                 struct cli_state *referring_cli,
 409                                 const char *server,
 410                                 const char *share,
 411                                 bool show_hdr,
 412                                 bool force_encrypt)
 413 {
 414         struct cli_state *c;
 415
 416         /* try to reuse an existing connection */
 417
 418         c = cli_cm_find(server, share);
 419         if (!c) {
 420                 c = cli_cm_connect(ctx, referring_cli,
 421                                 server, share, show_hdr, force_encrypt);
 422         }
 423
 424         return c;
 425 }
 426
 427 /****************************************************************************
 428 ****************************************************************************/
 429
 430 void cli_cm_shutdown(void)
 431 {
 432         struct client_connection *p, *x;
 433
 434         for (p=connections; p;) {
 435                 cli_shutdown(p->cli);
 436                 x = p;
 437                 p = p->next;
 438
 439                 TALLOC_FREE(x);
 440         }
 441
 442         connections = NULL;
 443         return;
 444 }
 445
 446 /****************************************************************************
 447 ****************************************************************************/
 448
 449 void cli_cm_display(void)
 450 {
 451         struct client_connection *p;
 452         int i;
 453
 454         for ( p=connections,i=0; p; p=p->next,i++ ) {
 455                 d_printf("%d:\tserver=%s, share=%s\n",
 456                         i, p->cli->desthost, p->cli->share );
 457         }
 458 }
 459
 460 /****************************************************************************
 461 ****************************************************************************/
 462
 463 static void cm_set_password(const char *newpass)
 464 {
 465         SAFE_FREE(cm_creds.password);
 466         cm_creds.password = SMB_STRDUP(newpass);
 467         if (cm_creds.password) {
 468                 cm_creds.got_pass = true;
 469         }
 470 }
 471
 472 /****************************************************************************
 473 ****************************************************************************/
 474
 475 void cli_cm_set_credentials(void)
 476 {
 477         SAFE_FREE(cm_creds.username);
 478         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username());
 479
 480         if (get_cmdline_auth_info_got_pass()) {
 481                 cm_set_password(get_cmdline_auth_info_password());
 482         }
 483
 484         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos();
 485         cm_creds.fallback_after_kerberos = false;
 486         cm_creds.signing_state = get_cmdline_auth_info_signing_state();
 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         char path_sep = '\\';
 669
 670         /* Ensure the extrapath doesn't start with a separator. */
 671         while (IS_DIRECTORY_SEP(*dir)) {
 672                 dir++;
 673         }
 674
 675         if (cli->posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 676                 path_sep = '/';
 677         }
 678         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 679                         path_sep,
 680                         cli->desthost,
 681                         path_sep,
 682                         cli->share,
 683                         path_sep,
 684                         dir);
 685 }
 686
 687 /********************************************************************
 688  check for dfs referral
 689 ********************************************************************/
 690
 691 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 692 {
 693         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 694
 695         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 696
 697         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 698                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 699                 return false;
 700
 701         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 702                 return true;
 703
 704         return false;
 705 }
 706
 707 /********************************************************************
 708  Get the dfs referral link.
 709 ********************************************************************/
 710
 711 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 712                         struct cli_state *cli,
 713                         const char *path,
 714                         CLIENT_DFS_REFERRAL**refs,
 715                         size_t *num_refs,
 716                         uint16 *consumed)
 717 {
 718         unsigned int data_len = 0;
 719         unsigned int param_len = 0;
 720         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 721         char *param;
 722         char *rparam=NULL, *rdata=NULL;
 723         char *p;
 724         char *endp;
 725         size_t pathlen = 2*(strlen(path)+1);
 726         uint16 num_referrals;
 727         CLIENT_DFS_REFERRAL *referrals = NULL;
 728         bool ret = false;
 729
 730         *num_refs = 0;
 731         *refs = NULL;
 732
 733         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 734         if (!param) {
 735                 return false;
 736         }
 737         SSVAL(param, 0, 0x03);  /* max referral level */
 738         p = &param[2];
 739
 740         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 741         param_len = PTR_DIFF(p, param);
 742
 743         if (!cli_send_trans(cli, SMBtrans2,
 744                         NULL,                        /* name */
 745                         -1, 0,                          /* fid, flags */
 746                         &setup, 1, 0,                   /* setup, length, max */
 747                         param, param_len, 2,            /* param, length, max */
 748                         NULL, 0, cli->max_xmit /* data, length, max */
 749                         )) {
 750                 SAFE_FREE(param);
 751                 return false;
 752         }
 753
 754         SAFE_FREE(param);
 755
 756         if (!cli_receive_trans(cli, SMBtrans2,
 757                 &rparam, &param_len,
 758                 &rdata, &data_len)) {
 759                         return false;
 760         }
 761
 762         if (data_len < 4) {
 763                 goto out;
 764         }
 765
 766         endp = rdata + data_len;
 767
 768         *consumed     = SVAL(rdata, 0);
 769         num_referrals = SVAL(rdata, 2);
 770
 771         if (num_referrals != 0) {
 772                 uint16 ref_version;
 773                 uint16 ref_size;
 774                 int i;
 775                 uint16 node_offset;
 776
 777                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 778                                 num_referrals);
 779
 780                 if (!referrals) {
 781                         goto out;
 782                 }
 783                 /* start at the referrals array */
 784
 785                 p = rdata+8;
 786                 for (i=0; i<num_referrals && p < endp; i++) {
 787                         if (p + 18 > endp) {
 788                                 goto out;
 789                         }
 790                         ref_version = SVAL(p, 0);
 791                         ref_size    = SVAL(p, 2);
 792                         node_offset = SVAL(p, 16);
 793
 794                         if (ref_version != 3) {
 795                                 p += ref_size;
 796                                 continue;
 797                         }
 798
 799                         referrals[i].proximity = SVAL(p, 8);
 800                         referrals[i].ttl       = SVAL(p, 10);
 801
 802                         if (p + node_offset > endp) {
 803                                 goto out;
 804                         }
 805                         clistr_pull_talloc(ctx, cli, &referrals[i].dfspath,
 806                                 p+node_offset, -1,
 807                                 STR_TERMINATE|STR_UNICODE );
 808
 809                         if (!referrals[i].dfspath) {
 810                                 goto out;
 811                         }
 812                         p += ref_size;
 813                 }
 814                 if (i < num_referrals) {
 815                         goto out;
 816                 }
 817         }
 818
 819         ret = true;
 820
 821         *num_refs = num_referrals;
 822         *refs = referrals;
 823
 824   out:
 825
 826         SAFE_FREE(rdata);
 827         SAFE_FREE(rparam);
 828         return ret;
 829 }
 830
 831 /********************************************************************
 832 ********************************************************************/
 833
 834 bool cli_resolve_path(TALLOC_CTX *ctx,
 835                         const char *mountpt,
 836                         struct cli_state *rootcli,
 837                         const char *path,
 838                         struct cli_state **targetcli,
 839                         char **pp_targetpath)
 840 {
 841         CLIENT_DFS_REFERRAL *refs = NULL;
 842         size_t num_refs = 0;
 843         uint16 consumed;
 844         struct cli_state *cli_ipc = NULL;
 845         char *dfs_path = NULL;
 846         char *cleanpath = NULL;
 847         char *extrapath = NULL;
 848         int pathlen;
 849         char *server = NULL;
 850         char *share = NULL;
 851         struct cli_state *newcli = NULL;
 852         char *newpath = NULL;
 853         char *newmount = NULL;
 854         char *ppath = NULL;
 855         SMB_STRUCT_STAT sbuf;
 856         uint32 attributes;
 857
 858         if ( !rootcli || !path || !targetcli ) {
 859                 return false;
 860         }
 861
 862         /* Don't do anything if this is not a DFS root. */
 863
 864         if ( !rootcli->dfsroot) {
 865                 *targetcli = rootcli;
 866                 *pp_targetpath = talloc_strdup(ctx, path);
 867                 if (!*pp_targetpath) {
 868                         return false;
 869                 }
 870                 return true;
 871         }
 872
 873         *targetcli = NULL;
 874
 875         /* Send a trans2_query_path_info to check for a referral. */
 876
 877         cleanpath = clean_path(ctx, path);
 878         if (!cleanpath) {
 879                 return false;
 880         }
 881
 882         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 883         if (!dfs_path) {
 884                 return false;
 885         }
 886
 887         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 888                 /* This is an ordinary path, just return it. */
 889                 *targetcli = rootcli;
 890                 *pp_targetpath = talloc_strdup(ctx, path);
 891                 if (!*pp_targetpath) {
 892                         return false;
 893                 }
 894                 goto done;
 895         }
 896
 897         /* Special case where client asked for a path that does not exist */
 898
 899         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 900                 *targetcli = rootcli;
 901                 *pp_targetpath = talloc_strdup(ctx, path);
 902                 if (!*pp_targetpath) {
 903                         return false;
 904                 }
 905                 goto done;
 906         }
 907
 908         /* We got an error, check for DFS referral. */
 909
 910         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 911                 return false;
 912         }
 913
 914         /* Check for the referral. */
 915
 916         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 917                                         rootcli->desthost,
 918                                         "IPC$", false,
 919                                         (rootcli->trans_enc_state != NULL)))) {
 920                 return false;
 921         }
 922
 923         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 924                         &num_refs, &consumed) || !num_refs) {
 925                 return false;
 926         }
 927
 928         /* Just store the first referral for now. */
 929
 930         if (!refs[0].dfspath) {
 931                 return false;
 932         }
 933         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 934
 935         if (!server || !share) {
 936                 return false;
 937         }
 938
 939         /* Make sure to recreate the original string including any wildcards. */
 940
 941         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 942         if (!dfs_path) {
 943                 return false;
 944         }
 945         pathlen = strlen(dfs_path)*2;
 946         consumed = MIN(pathlen, consumed);
 947         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 948         if (!*pp_targetpath) {
 949                 return false;
 950         }
 951         dfs_path[consumed/2] = '\0';
 952
 953         /*
 954          * *pp_targetpath is now the unconsumed part of the path.
 955          * dfs_path is now the consumed part of the path
 956          * (in \server\share\path format).
 957          */
 958
 959         /* Open the connection to the target server & share */
 960         if ((*targetcli = cli_cm_open(ctx, rootcli,
 961                                         server,
 962                                         share,
 963                                         false,
 964                                         (rootcli->trans_enc_state != NULL))) == NULL) {
 965                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 966                         server, share );
 967                 return false;
 968         }
 969
 970         if (extrapath && strlen(extrapath) > 0) {
 971                 *pp_targetpath = talloc_asprintf(ctx,
 972                                                 "%s%s",
 973                                                 extrapath,
 974                                                 *pp_targetpath);
 975                 if (!*pp_targetpath) {
 976                         return false;
 977                 }
 978         }
 979
 980         /* parse out the consumed mount path */
 981         /* trim off the \server\share\ */
 982
 983         ppath = dfs_path;
 984
 985         if (*ppath != '\\') {
 986                 d_printf("cli_resolve_path: "
 987                         "dfs_path (%s) not in correct format.\n",
 988                         dfs_path );
 989                 return false;
 990         }
 991
 992         ppath++; /* Now pointing at start of server name. */
 993
 994         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 995                 return false;
 996         }
 997
 998         ppath++; /* Now pointing at start of share name. */
 999
1000         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1001                 return false;
1002         }
1003
1004         ppath++; /* Now pointing at path component. */
1005
1006         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1007         if (!newmount) {
1008                 return false;
1009         }
1010
1011         cli_cm_set_mntpoint(*targetcli, newmount);
1012
1013         /* Check for another dfs referral, note that we are not
1014            checking for loops here. */
1015
1016         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1017                 if (cli_resolve_path(ctx,
1018                                         newmount,
1019                                         *targetcli,
1020                                         *pp_targetpath,
1021                                         &newcli,
1022                                         &newpath)) {
1023                         /*
1024                          * When cli_resolve_path returns true here it's always
1025                          * returning the complete path in newpath, so we're done
1026                          * here.
1027                          */
1028                         *targetcli = newcli;
1029                         *pp_targetpath = newpath;
1030                         return true;
1031                 }
1032         }
1033
1034   done:
1035
1036         /* If returning true ensure we return a dfs root full path. */
1037         if ((*targetcli)->dfsroot) {
1038                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1039                 if (!dfs_path) {
1040                         return false;
1041                 }
1042                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1043         }
1044
1045         return true;
1046 }
1047
1048 /********************************************************************
1049 ********************************************************************/
1050
1051 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1052                                 struct cli_state *cli,
1053                                 const char *sharename,
1054                                 char **pp_newserver,
1055                                 char **pp_newshare,
1056                                 bool force_encrypt,
1057                                 const char *username,
1058                                 const char *password,
1059                                 const char *domain)
1060 {
1061         CLIENT_DFS_REFERRAL *refs = NULL;
1062         size_t num_refs = 0;
1063         uint16 consumed;
1064         char *fullpath = NULL;
1065         bool res;
1066         uint16 cnum;
1067         char *newextrapath = NULL;
1068
1069         if (!cli || !sharename) {
1070                 return false;
1071         }
1072
1073         cnum = cli->cnum;
1074
1075         /* special case.  never check for a referral on the IPC$ share */
1076
1077         if (strequal(sharename, "IPC$")) {
1078                 return false;
1079         }
1080
1081         /* send a trans2_query_path_info to check for a referral */
1082
1083         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1084         if (!fullpath) {
1085                 return false;
1086         }
1087
1088         /* check for the referral */
1089
1090         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
1091                 return false;
1092         }
1093
1094         if (force_encrypt) {
1095                 NTSTATUS status = cli_cm_force_encryption(cli,
1096                                         username,
1097                                         password,
1098                                         lp_workgroup(),
1099                                         "IPC$");
1100                 if (!NT_STATUS_IS_OK(status)) {
1101                         return false;
1102                 }
1103         }
1104
1105         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1106
1107         if (!cli_tdis(cli)) {
1108                 return false;
1109         }
1110
1111         cli->cnum = cnum;
1112
1113         if (!res || !num_refs) {
1114                 return false;
1115         }
1116
1117         if (!refs[0].dfspath) {
1118                 return false;
1119         }
1120
1121         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1122                         pp_newshare, &newextrapath );
1123
1124         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1125                 return false;
1126         }
1127
1128         /* check that this is not a self-referral */
1129
1130         if (strequal(cli->desthost, *pp_newserver) &&
1131                         strequal(sharename, *pp_newshare)) {
1132                 return false;
1133         }
1134
1135         return true;
1136 }