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         status = cli_negprot(c);
 199
 200         if (!NT_STATUS_IS_OK(status)) {
 201                 d_printf("protocol negotiation failed: %s\n",
 202                          nt_errstr(status));
 203                 cli_shutdown(c);
 204                 return NULL;
 205         }
 206
 207         if (!cm_creds.got_pass && !cm_creds.use_kerberos) {
 208                 char *label = NULL;
 209                 char *pass;
 210                 label = talloc_asprintf(ctx, "Enter %s's password: ",
 211                         cm_creds.username);
 212                 pass = getpass(label);
 213                 if (pass) {
 214                         cm_set_password(pass);
 215                 }
 216                 TALLOC_FREE(label);
 217         }
 218
 219         username = cm_creds.username ? cm_creds.username : "";
 220         password = cm_creds.password ? cm_creds.password : "";
 221
 222         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 223                                                password, strlen(password),
 224                                                password, strlen(password),
 225                                                lp_workgroup()))) {
 226                 /* If a password was not supplied then
 227                  * try again with a null username. */
 228                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 229                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 230                                                 "", 0,
 231                                                 "", 0,
 232                                                lp_workgroup()))) {
 233                         d_printf("session setup failed: %s\n", cli_errstr(c));
 234                         if (NT_STATUS_V(cli_nt_error(c)) ==
 235                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 236                                 d_printf("did you forget to run kinit?\n");
 237                         cli_shutdown(c);
 238                         return NULL;
 239                 }
 240                 d_printf("Anonymous login successful\n");
 241         }
 242
 243         if ( show_sessetup ) {
 244                 if (*c->server_domain) {
 245                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 246                                 c->server_domain,c->server_os,c->server_type));
 247                 } else if (*c->server_os || *c->server_type) {
 248                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 249                                  c->server_os,c->server_type));
 250                 }
 251         }
 252         DEBUG(4,(" session setup ok\n"));
 253
 254         /* here's the fun part....to support 'msdfs proxy' shares
 255            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 256            here before trying to connect to the original share.
 257            check_dfs_proxy() will fail if it is a normal share. */
 258
 259         if ((c->capabilities & CAP_DFS) &&
 260                         cli_check_msdfs_proxy(ctx, c, sharename,
 261                                 &newserver, &newshare,
 262                                 force_encrypt,
 263                                 username,
 264                                 password,
 265                                 lp_workgroup())) {
 266                 cli_shutdown(c);
 267                 return do_connect(ctx, newserver,
 268                                 newshare, false, force_encrypt);
 269         }
 270
 271         /* must be a normal share */
 272
 273         if (!cli_send_tconX(c, sharename, "?????",
 274                                 password, strlen(password)+1)) {
 275                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 276                 cli_shutdown(c);
 277                 return NULL;
 278         }
 279
 280         if (force_encrypt) {
 281                 status = cli_cm_force_encryption(c,
 282                                         username,
 283                                         password,
 284                                         lp_workgroup(),
 285                                         sharename);
 286                 if (!NT_STATUS_IS_OK(status)) {
 287                         cli_shutdown(c);
 288                         return NULL;
 289                 }
 290         }
 291
 292         DEBUG(4,(" tconx ok\n"));
 293         return c;
 294 }
 295
 296 /****************************************************************************
 297 ****************************************************************************/
 298
 299 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 300 {
 301         struct client_connection *p;
 302         int i;
 303
 304         for (p=connections,i=0; p; p=p->next,i++) {
 305                 if (strequal(p->cli->desthost, c->desthost) &&
 306                                 strequal(p->cli->share, c->share)) {
 307                         break;
 308                 }
 309         }
 310
 311         if (p) {
 312                 char *name = clean_name(NULL, p->mount);
 313                 if (!name) {
 314                         return;
 315                 }
 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 ****************************************************************************/
 555
 556 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 557 {
 558         dest_ss = *pss;
 559         have_ip = true;
 560 }
 561
 562 /**********************************************************************
 563  split a dfs path into the server, share name, and extrapath components
 564 **********************************************************************/
 565
 566 static void split_dfs_path(TALLOC_CTX *ctx,
 567                                 const char *nodepath,
 568                                 char **pp_server,
 569                                 char **pp_share,
 570                                 char **pp_extrapath)
 571 {
 572         char *p, *q;
 573         char *path;
 574
 575         *pp_server = NULL;
 576         *pp_share = NULL;
 577         *pp_extrapath = NULL;
 578
 579         path = talloc_strdup(ctx, nodepath);
 580         if (!path) {
 581                 return;
 582         }
 583
 584         if ( path[0] != '\\' ) {
 585                 return;
 586         }
 587
 588         p = strchr_m( path + 1, '\\' );
 589         if ( !p ) {
 590                 return;
 591         }
 592
 593         *p = '\0';
 594         p++;
 595
 596         /* Look for any extra/deep path */
 597         q = strchr_m(p, '\\');
 598         if (q != NULL) {
 599                 *q = '\0';
 600                 q++;
 601                 *pp_extrapath = talloc_strdup(ctx, q);
 602         } else {
 603                 *pp_extrapath = talloc_strdup(ctx, "");
 604         }
 605
 606         *pp_share = talloc_strdup(ctx, p);
 607         *pp_server = talloc_strdup(ctx, &path[1]);
 608 }
 609
 610 /****************************************************************************
 611  Return the original path truncated at the directory component before
 612  the first wildcard character. Trust the caller to provide a NULL
 613  terminated string
 614 ****************************************************************************/
 615
 616 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 617 {
 618         size_t len;
 619         char *p1, *p2, *p;
 620         char *path_out;
 621
 622         /* No absolute paths. */
 623         while (IS_DIRECTORY_SEP(*path)) {
 624                 path++;
 625         }
 626
 627         path_out = talloc_strdup(ctx, path);
 628         if (!path_out) {
 629                 return NULL;
 630         }
 631
 632         p1 = strchr_m(path_out, '*');
 633         p2 = strchr_m(path_out, '?');
 634
 635         if (p1 || p2) {
 636                 if (p1 && p2) {
 637                         p = MIN(p1,p2);
 638                 } else if (!p1) {
 639                         p = p2;
 640                 } else {
 641                         p = p1;
 642                 }
 643                 *p = '\0';
 644
 645                 /* Now go back to the start of this component. */
 646                 p1 = strrchr_m(path_out, '/');
 647                 p2 = strrchr_m(path_out, '\\');
 648                 p = MAX(p1,p2);
 649                 if (p) {
 650                         *p = '\0';
 651                 }
 652         }
 653
 654         /* Strip any trailing separator */
 655
 656         len = strlen(path_out);
 657         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 658                 path_out[len-1] = '\0';
 659         }
 660
 661         return path_out;
 662 }
 663
 664 /****************************************************************************
 665 ****************************************************************************/
 666
 667 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 668                                         struct cli_state *cli,
 669                                         const char *dir)
 670 {
 671         /* Ensure the extrapath doesn't start with a separator. */
 672         while (IS_DIRECTORY_SEP(*dir)) {
 673                 dir++;
 674         }
 675
 676         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 677                         cli->desthost, cli->share, dir);
 678 }
 679
 680 /********************************************************************
 681  check for dfs referral
 682 ********************************************************************/
 683
 684 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 685 {
 686         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 687
 688         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 689
 690         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 691                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 692                 return false;
 693
 694         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 695                 return true;
 696
 697         return false;
 698 }
 699
 700 /********************************************************************
 701  Get the dfs referral link.
 702 ********************************************************************/
 703
 704 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 705                         struct cli_state *cli,
 706                         const char *path,
 707                         CLIENT_DFS_REFERRAL**refs,
 708                         size_t *num_refs,
 709                         uint16 *consumed)
 710 {
 711         unsigned int data_len = 0;
 712         unsigned int param_len = 0;
 713         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 714         char *param;
 715         char *rparam=NULL, *rdata=NULL;
 716         char *p;
 717         char *endp;
 718         size_t pathlen = 2*(strlen(path)+1);
 719         uint16 num_referrals;
 720         CLIENT_DFS_REFERRAL *referrals = NULL;
 721         bool ret = false;
 722
 723         *num_refs = 0;
 724         *refs = NULL;
 725
 726         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 727         if (!param) {
 728                 return false;
 729         }
 730         SSVAL(param, 0, 0x03);  /* max referral level */
 731         p = &param[2];
 732
 733         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 734         param_len = PTR_DIFF(p, param);
 735
 736         if (!cli_send_trans(cli, SMBtrans2,
 737                         NULL,                        /* name */
 738                         -1, 0,                          /* fid, flags */
 739                         &setup, 1, 0,                   /* setup, length, max */
 740                         param, param_len, 2,            /* param, length, max */
 741                         NULL, 0, cli->max_xmit /* data, length, max */
 742                         )) {
 743                 SAFE_FREE(param);
 744                 return false;
 745         }
 746
 747         SAFE_FREE(param);
 748
 749         if (!cli_receive_trans(cli, SMBtrans2,
 750                 &rparam, &param_len,
 751                 &rdata, &data_len)) {
 752                         return false;
 753         }
 754
 755         if (data_len < 4) {
 756                 goto out;
 757         }
 758
 759         endp = rdata + data_len;
 760
 761         *consumed     = SVAL(rdata, 0);
 762         num_referrals = SVAL(rdata, 2);
 763
 764         if (num_referrals != 0) {
 765                 uint16 ref_version;
 766                 uint16 ref_size;
 767                 int i;
 768                 uint16 node_offset;
 769
 770                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 771                                 num_referrals);
 772
 773                 if (!referrals) {
 774                         goto out;
 775                 }
 776                 /* start at the referrals array */
 777
 778                 p = rdata+8;
 779                 for (i=0; i<num_referrals && p < endp; i++) {
 780                         if (p + 18 > endp) {
 781                                 goto out;
 782                         }
 783                         ref_version = SVAL(p, 0);
 784                         ref_size    = SVAL(p, 2);
 785                         node_offset = SVAL(p, 16);
 786
 787                         if (ref_version != 3) {
 788                                 p += ref_size;
 789                                 continue;
 790                         }
 791
 792                         referrals[i].proximity = SVAL(p, 8);
 793                         referrals[i].ttl       = SVAL(p, 10);
 794
 795                         if (p + node_offset > endp) {
 796                                 goto out;
 797                         }
 798                         clistr_pull_talloc(ctx, cli, &referrals[i].dfspath,
 799                                 p+node_offset, -1,
 800                                 STR_TERMINATE|STR_UNICODE );
 801
 802                         if (!referrals[i].dfspath) {
 803                                 goto out;
 804                         }
 805                         p += ref_size;
 806                 }
 807                 if (i < num_referrals) {
 808                         goto out;
 809                 }
 810         }
 811
 812         ret = true;
 813
 814         *num_refs = num_referrals;
 815         *refs = referrals;
 816
 817   out:
 818
 819         SAFE_FREE(rdata);
 820         SAFE_FREE(rparam);
 821         return ret;
 822 }
 823
 824 /********************************************************************
 825 ********************************************************************/
 826
 827 bool cli_resolve_path(TALLOC_CTX *ctx,
 828                         const char *mountpt,
 829                         struct cli_state *rootcli,
 830                         const char *path,
 831                         struct cli_state **targetcli,
 832                         char **pp_targetpath)
 833 {
 834         CLIENT_DFS_REFERRAL *refs = NULL;
 835         size_t num_refs = 0;
 836         uint16 consumed;
 837         struct cli_state *cli_ipc = NULL;
 838         char *dfs_path = NULL;
 839         char *cleanpath = NULL;
 840         char *extrapath = NULL;
 841         int pathlen;
 842         char *server = NULL;
 843         char *share = NULL;
 844         struct cli_state *newcli = NULL;
 845         char *newpath = NULL;
 846         char *newmount = NULL;
 847         char *ppath = NULL;
 848         SMB_STRUCT_STAT sbuf;
 849         uint32 attributes;
 850
 851         if ( !rootcli || !path || !targetcli ) {
 852                 return false;
 853         }
 854
 855         /* Don't do anything if this is not a DFS root. */
 856
 857         if ( !rootcli->dfsroot) {
 858                 *targetcli = rootcli;
 859                 *pp_targetpath = talloc_strdup(ctx, path);
 860                 if (!*pp_targetpath) {
 861                         return false;
 862                 }
 863                 return true;
 864         }
 865
 866         *targetcli = NULL;
 867
 868         /* Send a trans2_query_path_info to check for a referral. */
 869
 870         cleanpath = clean_path(ctx, path);
 871         if (!cleanpath) {
 872                 return false;
 873         }
 874
 875         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 876         if (!dfs_path) {
 877                 return false;
 878         }
 879
 880         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 881                 /* This is an ordinary path, just return it. */
 882                 *targetcli = rootcli;
 883                 *pp_targetpath = talloc_strdup(ctx, path);
 884                 if (!*pp_targetpath) {
 885                         return false;
 886                 }
 887                 goto done;
 888         }
 889
 890         /* Special case where client asked for a path that does not exist */
 891
 892         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 893                 *targetcli = rootcli;
 894                 *pp_targetpath = talloc_strdup(ctx, path);
 895                 if (!*pp_targetpath) {
 896                         return false;
 897                 }
 898                 goto done;
 899         }
 900
 901         /* We got an error, check for DFS referral. */
 902
 903         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 904                 return false;
 905         }
 906
 907         /* Check for the referral. */
 908
 909         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 910                                         rootcli->desthost,
 911                                         "IPC$", false,
 912                                         (rootcli->trans_enc_state != NULL)))) {
 913                 return false;
 914         }
 915
 916         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 917                         &num_refs, &consumed) || !num_refs) {
 918                 return false;
 919         }
 920
 921         /* Just store the first referral for now. */
 922
 923         if (!refs[0].dfspath) {
 924                 return false;
 925         }
 926         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 927
 928         if (!server || !share) {
 929                 return false;
 930         }
 931
 932         /* Make sure to recreate the original string including any wildcards. */
 933
 934         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 935         if (!dfs_path) {
 936                 return false;
 937         }
 938         pathlen = strlen(dfs_path)*2;
 939         consumed = MIN(pathlen, consumed);
 940         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 941         if (!*pp_targetpath) {
 942                 return false;
 943         }
 944         dfs_path[consumed/2] = '\0';
 945
 946         /*
 947          * *pp_targetpath is now the unconsumed part of the path.
 948          * dfs_path is now the consumed part of the path
 949          * (in \server\share\path format).
 950          */
 951
 952         /* Open the connection to the target server & share */
 953         if ((*targetcli = cli_cm_open(ctx, rootcli,
 954                                         server,
 955                                         share,
 956                                         false,
 957                                         (rootcli->trans_enc_state != NULL))) == NULL) {
 958                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 959                         server, share );
 960                 return false;
 961         }
 962
 963         if (extrapath && strlen(extrapath) > 0) {
 964                 *pp_targetpath = talloc_asprintf(ctx,
 965                                                 "%s%s",
 966                                                 extrapath,
 967                                                 *pp_targetpath);
 968                 if (!*pp_targetpath) {
 969                         return false;
 970                 }
 971         }
 972
 973         /* parse out the consumed mount path */
 974         /* trim off the \server\share\ */
 975
 976         ppath = dfs_path;
 977
 978         if (*ppath != '\\') {
 979                 d_printf("cli_resolve_path: "
 980                         "dfs_path (%s) not in correct format.\n",
 981                         dfs_path );
 982                 return false;
 983         }
 984
 985         ppath++; /* Now pointing at start of server name. */
 986
 987         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 988                 return false;
 989         }
 990
 991         ppath++; /* Now pointing at start of share name. */
 992
 993         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 994                 return false;
 995         }
 996
 997         ppath++; /* Now pointing at path component. */
 998
 999         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1000         if (!newmount) {
1001                 return false;
1002         }
1003
1004         cli_cm_set_mntpoint(*targetcli, newmount);
1005
1006         /* Check for another dfs referral, note that we are not
1007            checking for loops here. */
1008
1009         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1010                 if (cli_resolve_path(ctx,
1011                                         newmount,
1012                                         *targetcli,
1013                                         *pp_targetpath,
1014                                         &newcli,
1015                                         &newpath)) {
1016                         /*
1017                          * When cli_resolve_path returns true here it's always
1018                          * returning the complete path in newpath, so we're done
1019                          * here.
1020                          */
1021                         *targetcli = newcli;
1022                         *pp_targetpath = newpath;
1023                         return true;
1024                 }
1025         }
1026
1027   done:
1028
1029         /* If returning true ensure we return a dfs root full path. */
1030         if ((*targetcli)->dfsroot) {
1031                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1032                 if (!dfs_path) {
1033                         return false;
1034                 }
1035                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1036         }
1037
1038         return true;
1039 }
1040
1041 /********************************************************************
1042 ********************************************************************/
1043
1044 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1045                                 struct cli_state *cli,
1046                                 const char *sharename,
1047                                 char **pp_newserver,
1048                                 char **pp_newshare,
1049                                 bool force_encrypt,
1050                                 const char *username,
1051                                 const char *password,
1052                                 const char *domain)
1053 {
1054         CLIENT_DFS_REFERRAL *refs = NULL;
1055         size_t num_refs = 0;
1056         uint16 consumed;
1057         char *fullpath = NULL;
1058         bool res;
1059         uint16 cnum;
1060         char *newextrapath = NULL;
1061
1062         if (!cli || !sharename) {
1063                 return false;
1064         }
1065
1066         cnum = cli->cnum;
1067
1068         /* special case.  never check for a referral on the IPC$ share */
1069
1070         if (strequal(sharename, "IPC$")) {
1071                 return false;
1072         }
1073
1074         /* send a trans2_query_path_info to check for a referral */
1075
1076         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1077         if (!fullpath) {
1078                 return false;
1079         }
1080
1081         /* check for the referral */
1082
1083         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
1084                 return false;
1085         }
1086
1087         if (force_encrypt) {
1088                 NTSTATUS status = cli_cm_force_encryption(cli,
1089                                         username,
1090                                         password,
1091                                         lp_workgroup(),
1092                                         "IPC$");
1093                 if (!NT_STATUS_IS_OK(status)) {
1094                         return false;
1095                 }
1096         }
1097
1098         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1099
1100         if (!cli_tdis(cli)) {
1101                 return false;
1102         }
1103
1104         cli->cnum = cnum;
1105
1106         if (!res || !num_refs) {
1107                 return false;
1108         }
1109
1110         if (!refs[0].dfspath) {
1111                 return false;
1112         }
1113
1114         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1115                         pp_newshare, &newextrapath );
1116
1117         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1118                 return false;
1119         }
1120
1121         /* check that this is not a self-referral */
1122
1123         if (strequal(cli->desthost, *pp_newserver) &&
1124                         strequal(sharename, *pp_newshare)) {
1125                 return false;
1126         }
1127
1128         return true;
1129 }