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                   2007-2009
   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 #include "libsmb/libsmb.h"
  24 #include "libsmb/clirap.h"
  25 #include "msdfs.h"
  26 #include "trans2.h"
  27 #include "libsmb/nmblib.h"
  28 #include "../libcli/smb/smbXcli_base.h"
  29
  30 /********************************************************************
  31  Important point.
  32
  33  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  34  are not C escaped here).
  35
  36  - but if we're using POSIX paths then <pathname> may contain
  37    '/' separators, not '\\' separators. So cope with '\\' or '/'
  38    as a separator when looking at the pathname part.... JRA.
  39 ********************************************************************/
  40
  41 /********************************************************************
  42  Ensure a connection is encrypted.
  43 ********************************************************************/
  44
  45 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  46                         const char *username,
  47                         const char *password,
  48                         const char *domain,
  49                         const char *sharename)
  50 {
  51         NTSTATUS status;
  52
  53         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
  54                 status = smb2cli_session_encryption_on(c->smb2.session);
  55                 if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  56                         d_printf("Encryption required and "
  57                                 "server doesn't support "
  58                                 "SMB3 encryption - failing connect\n");
  59                 } else if (!NT_STATUS_IS_OK(status)) {
  60                         d_printf("Encryption required and "
  61                                 "setup failed with error %s.\n",
  62                                 nt_errstr(status));
  63                 }
  64                 return status;
  65         }
  66
  67         status = cli_force_encryption(c,
  68                                         username,
  69                                         password,
  70                                         domain);
  71
  72         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  73                 d_printf("Encryption required and "
  74                         "server that doesn't support "
  75                         "UNIX extensions - failing connect\n");
  76         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  77                 d_printf("Encryption required and "
  78                         "can't get UNIX CIFS extensions "
  79                         "version from server.\n");
  80         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  81                 d_printf("Encryption required and "
  82                         "share %s doesn't support "
  83                         "encryption.\n", sharename);
  84         } else if (!NT_STATUS_IS_OK(status)) {
  85                 d_printf("Encryption required and "
  86                         "setup failed with error %s.\n",
  87                         nt_errstr(status));
  88         }
  89
  90         return status;
  91 }
  92
  93 /********************************************************************
  94  Return a connection to a server.
  95 ********************************************************************/
  96
  97 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  98                                         const char *server,
  99                                         const char *share,
 100                                         const struct user_auth_info *auth_info,
 101                                         bool show_sessetup,
 102                                         bool force_encrypt,
 103                                         int max_protocol,
 104                                         int port,
 105                                         int name_type,
 106                                         struct cli_state **pcli)
 107 {
 108         struct cli_state *c = NULL;
 109         char *servicename;
 110         char *sharename;
 111         char *newserver, *newshare;
 112         const char *username;
 113         const char *password;
 114         const char *domain;
 115         NTSTATUS status;
 116         int flags = 0;
 117
 118         /* make a copy so we don't modify the global string 'service' */
 119         servicename = talloc_strdup(ctx,share);
 120         if (!servicename) {
 121                 return NT_STATUS_NO_MEMORY;
 122         }
 123         sharename = servicename;
 124         if (*sharename == '\\') {
 125                 sharename += 2;
 126                 if (server == NULL) {
 127                         server = sharename;
 128                 }
 129                 sharename = strchr_m(sharename,'\\');
 130                 if (!sharename) {
 131                         return NT_STATUS_NO_MEMORY;
 132                 }
 133                 *sharename = 0;
 134                 sharename++;
 135         }
 136         if (server == NULL) {
 137                 return NT_STATUS_INVALID_PARAMETER;
 138         }
 139
 140         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 141                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 142         }
 143         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 144                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 145         }
 146         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 147                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 148         }
 149         if (get_cmdline_auth_info_use_pw_nt_hash(auth_info)) {
 150                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 151         }
 152
 153         status = cli_connect_nb(
 154                 server, NULL, port, name_type, NULL,
 155                 get_cmdline_auth_info_signing_state(auth_info),
 156                 flags, &c);
 157
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 d_printf("Connection to %s failed (Error %s)\n",
 160                                 server,
 161                                 nt_errstr(status));
 162                 return status;
 163         }
 164
 165         if (max_protocol == 0) {
 166                 max_protocol = PROTOCOL_NT1;
 167         }
 168         DEBUG(4,(" session request ok\n"));
 169
 170         status = smbXcli_negprot(c->conn, c->timeout,
 171                                  lp_client_min_protocol(),
 172                                  max_protocol);
 173
 174         if (!NT_STATUS_IS_OK(status)) {
 175                 d_printf("protocol negotiation failed: %s\n",
 176                          nt_errstr(status));
 177                 cli_shutdown(c);
 178                 return status;
 179         }
 180
 181         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 182                 /* Ensure we ask for some initial credits. */
 183                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 184         }
 185
 186         username = get_cmdline_auth_info_username(auth_info);
 187         password = get_cmdline_auth_info_password(auth_info);
 188         domain = get_cmdline_auth_info_domain(auth_info);
 189         if ((domain == NULL) || (domain[0] == '\0')) {
 190                 domain = lp_workgroup();
 191         }
 192
 193         status = cli_session_setup(c, username,
 194                                    password, strlen(password),
 195                                    password, strlen(password),
 196                                    domain);
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 /* If a password was not supplied then
 199                  * try again with a null username. */
 200                 if (password[0] || !username[0] ||
 201                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 202                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 203                                                 "", 0,
 204                                                 "", 0,
 205                                                lp_workgroup()))) {
 206                         d_printf("session setup failed: %s\n",
 207                                  nt_errstr(status));
 208                         if (NT_STATUS_EQUAL(status,
 209                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 210                                 d_printf("did you forget to run kinit?\n");
 211                         cli_shutdown(c);
 212                         return status;
 213                 }
 214                 d_printf("Anonymous login successful\n");
 215         }
 216
 217         if (!NT_STATUS_IS_OK(status)) {
 218                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 219                 cli_shutdown(c);
 220                 return status;
 221         }
 222
 223         if ( show_sessetup ) {
 224                 if (*c->server_domain) {
 225                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 226                                 c->server_domain,c->server_os,c->server_type));
 227                 } else if (*c->server_os || *c->server_type) {
 228                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 229                                  c->server_os,c->server_type));
 230                 }
 231         }
 232         DEBUG(4,(" session setup ok\n"));
 233
 234         /* here's the fun part....to support 'msdfs proxy' shares
 235            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 236            here before trying to connect to the original share.
 237            cli_check_msdfs_proxy() will fail if it is a normal share. */
 238
 239         if (smbXcli_conn_dfs_supported(c->conn) &&
 240                         cli_check_msdfs_proxy(ctx, c, sharename,
 241                                 &newserver, &newshare,
 242                                 force_encrypt,
 243                                 username,
 244                                 password,
 245                                 domain)) {
 246                 cli_shutdown(c);
 247                 return do_connect(ctx, newserver,
 248                                 newshare, auth_info, false,
 249                                 force_encrypt, max_protocol,
 250                                 port, name_type, pcli);
 251         }
 252
 253         /* must be a normal share */
 254
 255         status = cli_tree_connect(c, sharename, "?????",
 256                                   password, strlen(password)+1);
 257         if (!NT_STATUS_IS_OK(status)) {
 258                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 259                 cli_shutdown(c);
 260                 return status;
 261         }
 262
 263         if (force_encrypt) {
 264                 status = cli_cm_force_encryption(c,
 265                                         username,
 266                                         password,
 267                                         domain,
 268                                         sharename);
 269                 if (!NT_STATUS_IS_OK(status)) {
 270                         cli_shutdown(c);
 271                         return status;
 272                 }
 273         }
 274
 275         DEBUG(4,(" tconx ok\n"));
 276         *pcli = c;
 277         return NT_STATUS_OK;
 278 }
 279
 280 /****************************************************************************
 281 ****************************************************************************/
 282
 283 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 284 {
 285         TALLOC_CTX *frame = talloc_stackframe();
 286         char *name = clean_name(frame, mnt);
 287         if (!name) {
 288                 TALLOC_FREE(frame);
 289                 return;
 290         }
 291         TALLOC_FREE(cli->dfs_mountpoint);
 292         cli->dfs_mountpoint = talloc_strdup(cli, name);
 293         TALLOC_FREE(frame);
 294 }
 295
 296 /********************************************************************
 297  Add a new connection to the list.
 298  referring_cli == NULL means a new initial connection.
 299 ********************************************************************/
 300
 301 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 302                                struct cli_state *referring_cli,
 303                                const char *server,
 304                                const char *share,
 305                                const struct user_auth_info *auth_info,
 306                                bool show_hdr,
 307                                bool force_encrypt,
 308                                int max_protocol,
 309                                int port,
 310                                int name_type,
 311                                struct cli_state **pcli)
 312 {
 313         struct cli_state *cli;
 314         NTSTATUS status;
 315
 316         status = do_connect(ctx, server, share,
 317                                 auth_info,
 318                                 show_hdr, force_encrypt, max_protocol,
 319                                 port, name_type, &cli);
 320
 321         if (!NT_STATUS_IS_OK(status)) {
 322                 return status;
 323         }
 324
 325         /* Enter into the list. */
 326         if (referring_cli) {
 327                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 328         }
 329
 330         if (referring_cli && referring_cli->requested_posix_capabilities) {
 331                 uint16_t major, minor;
 332                 uint32_t caplow, caphigh;
 333                 status = cli_unix_extensions_version(cli, &major, &minor,
 334                                                      &caplow, &caphigh);
 335                 if (NT_STATUS_IS_OK(status)) {
 336                         cli_set_unix_extensions_capabilities(cli,
 337                                         major, minor,
 338                                         caplow, caphigh);
 339                 }
 340         }
 341
 342         *pcli = cli;
 343         return NT_STATUS_OK;
 344 }
 345
 346 /********************************************************************
 347  Return a connection to a server on a particular share.
 348 ********************************************************************/
 349
 350 static struct cli_state *cli_cm_find(struct cli_state *cli,
 351                                 const char *server,
 352                                 const char *share)
 353 {
 354         struct cli_state *p;
 355
 356         if (cli == NULL) {
 357                 return NULL;
 358         }
 359
 360         /* Search to the start of the list. */
 361         for (p = cli; p; p = DLIST_PREV(p)) {
 362                 const char *remote_name =
 363                         smbXcli_conn_remote_name(p->conn);
 364
 365                 if (strequal(server, remote_name) &&
 366                                 strequal(share,p->share)) {
 367                         return p;
 368                 }
 369         }
 370
 371         /* Search to the end of the list. */
 372         for (p = cli->next; p; p = p->next) {
 373                 const char *remote_name =
 374                         smbXcli_conn_remote_name(p->conn);
 375
 376                 if (strequal(server, remote_name) &&
 377                                 strequal(share,p->share)) {
 378                         return p;
 379                 }
 380         }
 381
 382         return NULL;
 383 }
 384
 385 /****************************************************************************
 386  Open a client connection to a \\server\share.
 387 ****************************************************************************/
 388
 389 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 390                                 struct cli_state *referring_cli,
 391                                 const char *server,
 392                                 const char *share,
 393                                 const struct user_auth_info *auth_info,
 394                                 bool show_hdr,
 395                                 bool force_encrypt,
 396                                 int max_protocol,
 397                                 int port,
 398                                 int name_type,
 399                                 struct cli_state **pcli)
 400 {
 401         /* Try to reuse an existing connection in this list. */
 402         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 403         NTSTATUS status;
 404
 405         if (c) {
 406                 *pcli = c;
 407                 return NT_STATUS_OK;
 408         }
 409
 410         if (auth_info == NULL) {
 411                 /* Can't do a new connection
 412                  * without auth info. */
 413                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 414                         "without auth info\n",
 415                         server, share );
 416                 return NT_STATUS_INVALID_PARAMETER;
 417         }
 418
 419         status = cli_cm_connect(ctx,
 420                                 referring_cli,
 421                                 server,
 422                                 share,
 423                                 auth_info,
 424                                 show_hdr,
 425                                 force_encrypt,
 426                                 max_protocol,
 427                                 port,
 428                                 name_type,
 429                                 &c);
 430         if (!NT_STATUS_IS_OK(status)) {
 431                 return status;
 432         }
 433         *pcli = c;
 434         return NT_STATUS_OK;
 435 }
 436
 437 /****************************************************************************
 438 ****************************************************************************/
 439
 440 void cli_cm_display(struct cli_state *cli)
 441 {
 442         int i;
 443
 444         for (i=0; cli; cli = cli->next,i++ ) {
 445                 d_printf("%d:\tserver=%s, share=%s\n",
 446                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 447         }
 448 }
 449
 450 /****************************************************************************
 451 ****************************************************************************/
 452
 453 /****************************************************************************
 454 ****************************************************************************/
 455
 456 #if 0
 457 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 458 {
 459         SAFE_FREE(cm_creds.username);
 460         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 461                                                auth_info));
 462
 463         if (get_cmdline_auth_info_got_pass(auth_info)) {
 464                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 465         }
 466
 467         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 468         cm_creds.fallback_after_kerberos = false;
 469         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 470 }
 471 #endif
 472
 473 /**********************************************************************
 474  split a dfs path into the server, share name, and extrapath components
 475 **********************************************************************/
 476
 477 static bool split_dfs_path(TALLOC_CTX *ctx,
 478                                 const char *nodepath,
 479                                 char **pp_server,
 480                                 char **pp_share,
 481                                 char **pp_extrapath)
 482 {
 483         char *p, *q;
 484         char *path;
 485
 486         *pp_server = NULL;
 487         *pp_share = NULL;
 488         *pp_extrapath = NULL;
 489
 490         path = talloc_strdup(ctx, nodepath);
 491         if (!path) {
 492                 goto fail;
 493         }
 494
 495         if ( path[0] != '\\' ) {
 496                 goto fail;
 497         }
 498
 499         p = strchr_m( path + 1, '\\' );
 500         if ( !p ) {
 501                 goto fail;
 502         }
 503
 504         *p = '\0';
 505         p++;
 506
 507         /* Look for any extra/deep path */
 508         q = strchr_m(p, '\\');
 509         if (q != NULL) {
 510                 *q = '\0';
 511                 q++;
 512                 *pp_extrapath = talloc_strdup(ctx, q);
 513         } else {
 514                 *pp_extrapath = talloc_strdup(ctx, "");
 515         }
 516         if (*pp_extrapath == NULL) {
 517                 goto fail;
 518         }
 519
 520         *pp_share = talloc_strdup(ctx, p);
 521         if (*pp_share == NULL) {
 522                 goto fail;
 523         }
 524
 525         *pp_server = talloc_strdup(ctx, &path[1]);
 526         if (*pp_server == NULL) {
 527                 goto fail;
 528         }
 529
 530         TALLOC_FREE(path);
 531         return true;
 532
 533 fail:
 534         TALLOC_FREE(*pp_share);
 535         TALLOC_FREE(*pp_extrapath);
 536         TALLOC_FREE(path);
 537         return false;
 538 }
 539
 540 /****************************************************************************
 541  Return the original path truncated at the directory component before
 542  the first wildcard character. Trust the caller to provide a NULL
 543  terminated string
 544 ****************************************************************************/
 545
 546 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 547 {
 548         size_t len;
 549         char *p1, *p2, *p;
 550         char *path_out;
 551
 552         /* No absolute paths. */
 553         while (IS_DIRECTORY_SEP(*path)) {
 554                 path++;
 555         }
 556
 557         path_out = talloc_strdup(ctx, path);
 558         if (!path_out) {
 559                 return NULL;
 560         }
 561
 562         p1 = strchr_m(path_out, '*');
 563         p2 = strchr_m(path_out, '?');
 564
 565         if (p1 || p2) {
 566                 if (p1 && p2) {
 567                         p = MIN(p1,p2);
 568                 } else if (!p1) {
 569                         p = p2;
 570                 } else {
 571                         p = p1;
 572                 }
 573                 *p = '\0';
 574
 575                 /* Now go back to the start of this component. */
 576                 p1 = strrchr_m(path_out, '/');
 577                 p2 = strrchr_m(path_out, '\\');
 578                 p = MAX(p1,p2);
 579                 if (p) {
 580                         *p = '\0';
 581                 }
 582         }
 583
 584         /* Strip any trailing separator */
 585
 586         len = strlen(path_out);
 587         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 588                 path_out[len-1] = '\0';
 589         }
 590
 591         return path_out;
 592 }
 593
 594 /****************************************************************************
 595 ****************************************************************************/
 596
 597 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 598                                         struct cli_state *cli,
 599                                         const char *dir)
 600 {
 601         char path_sep = '\\';
 602
 603         /* Ensure the extrapath doesn't start with a separator. */
 604         while (IS_DIRECTORY_SEP(*dir)) {
 605                 dir++;
 606         }
 607
 608         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 609                 path_sep = '/';
 610         }
 611         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 612                         path_sep,
 613                         smbXcli_conn_remote_name(cli->conn),
 614                         path_sep,
 615                         cli->share,
 616                         path_sep,
 617                         dir);
 618 }
 619
 620 /********************************************************************
 621  check for dfs referral
 622 ********************************************************************/
 623
 624 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 625                                 NTSTATUS status)
 626 {
 627         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 628
 629         if (!(smbXcli_conn_use_unicode(cli->conn))) {
 630                 return false;
 631         }
 632         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 633                 return false;
 634         }
 635         if (NT_STATUS_EQUAL(status, expected)) {
 636                 return true;
 637         }
 638         return false;
 639 }
 640
 641 /********************************************************************
 642  Get the dfs referral link.
 643 ********************************************************************/
 644
 645 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 646                         struct cli_state *cli,
 647                         const char *path,
 648                         struct client_dfs_referral **refs,
 649                         size_t *num_refs,
 650                         size_t *consumed)
 651 {
 652         unsigned int param_len = 0;
 653         uint16_t recv_flags2;
 654         uint8_t *param = NULL;
 655         uint8_t *rdata = NULL;
 656         char *p;
 657         char *endp;
 658         smb_ucs2_t *path_ucs;
 659         char *consumed_path = NULL;
 660         uint16_t consumed_ucs;
 661         uint16_t num_referrals;
 662         struct client_dfs_referral *referrals = NULL;
 663         NTSTATUS status;
 664         TALLOC_CTX *frame = talloc_stackframe();
 665
 666         *num_refs = 0;
 667         *refs = NULL;
 668
 669         param = talloc_array(talloc_tos(), uint8_t, 2);
 670         if (!param) {
 671                 status = NT_STATUS_NO_MEMORY;
 672                 goto out;
 673         }
 674         SSVAL(param, 0, 0x03);  /* max referral level */
 675
 676         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 677                                       path, strlen(path)+1,
 678                                       NULL);
 679         if (!param) {
 680                 status = NT_STATUS_NO_MEMORY;
 681                 goto out;
 682         }
 683         param_len = talloc_get_size(param);
 684         path_ucs = (smb_ucs2_t *)&param[2];
 685
 686         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
 687                 DATA_BLOB in_input_buffer;
 688                 DATA_BLOB in_output_buffer = data_blob_null;
 689                 DATA_BLOB out_input_buffer = data_blob_null;
 690                 DATA_BLOB out_output_buffer = data_blob_null;
 691
 692                 in_input_buffer.data = param;
 693                 in_input_buffer.length = param_len;
 694
 695                 status = smb2cli_ioctl(cli->conn,
 696                                        cli->timeout,
 697                                        cli->smb2.session,
 698                                        cli->smb2.tcon,
 699                                        UINT64_MAX, /* in_fid_persistent */
 700                                        UINT64_MAX, /* in_fid_volatile */
 701                                        FSCTL_DFS_GET_REFERRALS,
 702                                        0, /* in_max_input_length */
 703                                        &in_input_buffer,
 704                                        CLI_BUFFER_SIZE, /* in_max_output_length */
 705                                        &in_output_buffer,
 706                                        SMB2_IOCTL_FLAG_IS_FSCTL,
 707                                        talloc_tos(),
 708                                        &out_input_buffer,
 709                                        &out_output_buffer);
 710                 if (!NT_STATUS_IS_OK(status)) {
 711                         goto out;
 712                 }
 713
 714                 if (out_output_buffer.length < 4) {
 715                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 716                         goto out;
 717                 }
 718
 719                 recv_flags2 = FLAGS2_UNICODE_STRINGS;
 720                 rdata = out_output_buffer.data;
 721                 endp = (char *)rdata + out_output_buffer.length;
 722         } else {
 723                 unsigned int data_len = 0;
 724                 uint16_t setup[1];
 725
 726                 SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 727
 728                 status = cli_trans(talloc_tos(), cli, SMBtrans2,
 729                                    NULL, 0xffff, 0, 0,
 730                                    setup, 1, 0,
 731                                    param, param_len, 2,
 732                                    NULL, 0, CLI_BUFFER_SIZE,
 733                                    &recv_flags2,
 734                                    NULL, 0, NULL, /* rsetup */
 735                                    NULL, 0, NULL,
 736                                    &rdata, 4, &data_len);
 737                 if (!NT_STATUS_IS_OK(status)) {
 738                         goto out;
 739                 }
 740
 741                 endp = (char *)rdata + data_len;
 742         }
 743
 744         consumed_ucs  = SVAL(rdata, 0);
 745         num_referrals = SVAL(rdata, 2);
 746
 747         /* consumed_ucs is the number of bytes
 748          * of the UCS2 path consumed not counting any
 749          * terminating null. We need to convert
 750          * back to unix charset and count again
 751          * to get the number of bytes consumed from
 752          * the incoming path. */
 753
 754         errno = 0;
 755         if (pull_string_talloc(talloc_tos(),
 756                         NULL,
 757                         0,
 758                         &consumed_path,
 759                         path_ucs,
 760                         consumed_ucs,
 761                         STR_UNICODE) == 0) {
 762                 if (errno != 0) {
 763                         status = map_nt_error_from_unix(errno);
 764                 } else {
 765                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 766                 }
 767                 goto out;
 768         }
 769         if (consumed_path == NULL) {
 770                 status = map_nt_error_from_unix(errno);
 771                 goto out;
 772         }
 773         *consumed = strlen(consumed_path);
 774
 775         if (num_referrals != 0) {
 776                 uint16_t ref_version;
 777                 uint16_t ref_size;
 778                 int i;
 779                 uint16_t node_offset;
 780
 781                 referrals = talloc_array(ctx, struct client_dfs_referral,
 782                                          num_referrals);
 783
 784                 if (!referrals) {
 785                         status = NT_STATUS_NO_MEMORY;
 786                         goto out;
 787                 }
 788                 /* start at the referrals array */
 789
 790                 p = (char *)rdata+8;
 791                 for (i=0; i<num_referrals && p < endp; i++) {
 792                         if (p + 18 > endp) {
 793                                 goto out;
 794                         }
 795                         ref_version = SVAL(p, 0);
 796                         ref_size    = SVAL(p, 2);
 797                         node_offset = SVAL(p, 16);
 798
 799                         if (ref_version != 3) {
 800                                 p += ref_size;
 801                                 continue;
 802                         }
 803
 804                         referrals[i].proximity = SVAL(p, 8);
 805                         referrals[i].ttl       = SVAL(p, 10);
 806
 807                         if (p + node_offset > endp) {
 808                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 809                                 goto out;
 810                         }
 811                         clistr_pull_talloc(referrals,
 812                                            (const char *)rdata,
 813                                            recv_flags2,
 814                                            &referrals[i].dfspath,
 815                                            p+node_offset,
 816                                            PTR_DIFF(endp, p+node_offset),
 817                                            STR_TERMINATE|STR_UNICODE);
 818
 819                         if (!referrals[i].dfspath) {
 820                                 status = map_nt_error_from_unix(errno);
 821                                 goto out;
 822                         }
 823                         p += ref_size;
 824                 }
 825                 if (i < num_referrals) {
 826                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 827                         goto out;
 828                 }
 829         }
 830
 831         *num_refs = num_referrals;
 832         *refs = referrals;
 833
 834   out:
 835
 836         TALLOC_FREE(frame);
 837         return status;
 838 }
 839
 840 /********************************************************************
 841 ********************************************************************/
 842 struct cli_dfs_path_split {
 843         char *server;
 844         char *share;
 845         char *extrapath;
 846 };
 847
 848 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 849                           const char *mountpt,
 850                           const struct user_auth_info *dfs_auth_info,
 851                           struct cli_state *rootcli,
 852                           const char *path,
 853                           struct cli_state **targetcli,
 854                           char **pp_targetpath)
 855 {
 856         struct client_dfs_referral *refs = NULL;
 857         size_t num_refs = 0;
 858         size_t consumed = 0;
 859         struct cli_state *cli_ipc = NULL;
 860         char *dfs_path = NULL;
 861         char *cleanpath = NULL;
 862         char *extrapath = NULL;
 863         int pathlen;
 864         struct cli_state *newcli = NULL;
 865         struct cli_state *ccli = NULL;
 866         int count = 0;
 867         char *newpath = NULL;
 868         char *newmount = NULL;
 869         char *ppath = NULL;
 870         SMB_STRUCT_STAT sbuf;
 871         uint32_t attributes;
 872         NTSTATUS status;
 873         struct smbXcli_tcon *root_tcon = NULL;
 874         struct smbXcli_tcon *target_tcon = NULL;
 875         struct cli_dfs_path_split *dfs_refs = NULL;
 876
 877         if ( !rootcli || !path || !targetcli ) {
 878                 return NT_STATUS_INVALID_PARAMETER;
 879         }
 880
 881         /* Don't do anything if this is not a DFS root. */
 882
 883         if (smbXcli_conn_protocol(rootcli->conn) >= PROTOCOL_SMB2_02) {
 884                 root_tcon = rootcli->smb2.tcon;
 885         } else {
 886                 root_tcon = rootcli->smb1.tcon;
 887         }
 888
 889         if (!smbXcli_tcon_is_dfs_share(root_tcon)) {
 890                 *targetcli = rootcli;
 891                 *pp_targetpath = talloc_strdup(ctx, path);
 892                 if (!*pp_targetpath) {
 893                         return NT_STATUS_NO_MEMORY;
 894                 }
 895                 return NT_STATUS_OK;
 896         }
 897
 898         *targetcli = NULL;
 899
 900         /* Send a trans2_query_path_info to check for a referral. */
 901
 902         cleanpath = clean_path(ctx, path);
 903         if (!cleanpath) {
 904                 return NT_STATUS_NO_MEMORY;
 905         }
 906
 907         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 908         if (!dfs_path) {
 909                 return NT_STATUS_NO_MEMORY;
 910         }
 911
 912         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 913         if (NT_STATUS_IS_OK(status)) {
 914                 /* This is an ordinary path, just return it. */
 915                 *targetcli = rootcli;
 916                 *pp_targetpath = talloc_strdup(ctx, path);
 917                 if (!*pp_targetpath) {
 918                         return NT_STATUS_NO_MEMORY;
 919                 }
 920                 goto done;
 921         }
 922
 923         /* Special case where client asked for a path that does not exist */
 924
 925         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 926                                 status)) {
 927                 *targetcli = rootcli;
 928                 *pp_targetpath = talloc_strdup(ctx, path);
 929                 if (!*pp_targetpath) {
 930                         return NT_STATUS_NO_MEMORY;
 931                 }
 932                 goto done;
 933         }
 934
 935         /* We got an error, check for DFS referral. */
 936
 937         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 938                                  status)) {
 939                 return status;
 940         }
 941
 942         /* Check for the referral. */
 943
 944         status = cli_cm_open(ctx,
 945                              rootcli,
 946                              smbXcli_conn_remote_name(rootcli->conn),
 947                              "IPC$",
 948                              dfs_auth_info,
 949                              false,
 950                              smb1cli_conn_encryption_on(rootcli->conn),
 951                              smbXcli_conn_protocol(rootcli->conn),
 952                              0,
 953                              0x20,
 954                              &cli_ipc);
 955         if (!NT_STATUS_IS_OK(status)) {
 956                 return status;
 957         }
 958
 959         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 960                                       &num_refs, &consumed);
 961         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 962                 return status;
 963         }
 964
 965         if (!refs[0].dfspath) {
 966                 return NT_STATUS_NOT_FOUND;
 967         }
 968
 969         /*
 970          * Bug#10123 - DFS referal entries can be provided in a random order,
 971          * so check the connection cache for each item to avoid unnecessary
 972          * reconnections.
 973          */
 974         dfs_refs = talloc_array(ctx, struct cli_dfs_path_split, num_refs);
 975         if (dfs_refs == NULL) {
 976                 return NT_STATUS_NO_MEMORY;
 977         }
 978
 979         for (count = 0; count < num_refs; count++) {
 980                 if (!split_dfs_path(dfs_refs, refs[count].dfspath,
 981                                     &dfs_refs[count].server,
 982                                     &dfs_refs[count].share,
 983                                     &dfs_refs[count].extrapath)) {
 984                         TALLOC_FREE(dfs_refs);
 985                         return NT_STATUS_NOT_FOUND;
 986                 }
 987
 988                 ccli = cli_cm_find(rootcli, dfs_refs[count].server,
 989                                    dfs_refs[count].share);
 990                 if (ccli != NULL) {
 991                         extrapath = dfs_refs[count].extrapath;
 992                         *targetcli = ccli;
 993                         break;
 994                 }
 995         }
 996
 997         /*
 998          * If no cached connection was found, then connect to the first live
 999          * referral server in the list.
1000          */
1001         for (count = 0; (ccli == NULL) && (count < num_refs); count++) {
1002                 /* Connect to the target server & share */
1003                 status = cli_cm_connect(ctx, rootcli,
1004                                 dfs_refs[count].server,
1005                                 dfs_refs[count].share,
1006                                 dfs_auth_info,
1007                                 false,
1008                                 smb1cli_conn_encryption_on(rootcli->conn),
1009                                 smbXcli_conn_protocol(rootcli->conn),
1010                                 0,
1011                                 0x20,
1012                                 targetcli);
1013                 if (!NT_STATUS_IS_OK(status)) {
1014                         d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
1015                                  dfs_refs[count].server,
1016                                  dfs_refs[count].share);
1017                         continue;
1018                 } else {
1019                         extrapath = dfs_refs[count].extrapath;
1020                         break;
1021                 }
1022         }
1023
1024         /* No available referral server for the connection */
1025         if (*targetcli == NULL) {
1026                 TALLOC_FREE(dfs_refs);
1027                 return status;
1028         }
1029
1030         /* Make sure to recreate the original string including any wildcards. */
1031
1032         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
1033         if (!dfs_path) {
1034                 TALLOC_FREE(dfs_refs);
1035                 return NT_STATUS_NO_MEMORY;
1036         }
1037         pathlen = strlen(dfs_path);
1038         consumed = MIN(pathlen, consumed);
1039         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
1040         if (!*pp_targetpath) {
1041                 TALLOC_FREE(dfs_refs);
1042                 return NT_STATUS_NO_MEMORY;
1043         }
1044         dfs_path[consumed] = '\0';
1045
1046         /*
1047          * *pp_targetpath is now the unconsumed part of the path.
1048          * dfs_path is now the consumed part of the path
1049          * (in \server\share\path format).
1050          */
1051
1052         if (extrapath && strlen(extrapath) > 0) {
1053                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
1054                 /* put the trailing \ on the path, so to be save we put one in if needed */
1055                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
1056                         *pp_targetpath = talloc_asprintf(ctx,
1057                                                   "%s\\%s",
1058                                                   extrapath,
1059                                                   *pp_targetpath);
1060                 } else {
1061                         *pp_targetpath = talloc_asprintf(ctx,
1062                                                   "%s%s",
1063                                                   extrapath,
1064                                                   *pp_targetpath);
1065                 }
1066                 if (!*pp_targetpath) {
1067                         TALLOC_FREE(dfs_refs);
1068                         return NT_STATUS_NO_MEMORY;
1069                 }
1070         }
1071
1072         /* parse out the consumed mount path */
1073         /* trim off the \server\share\ */
1074
1075         ppath = dfs_path;
1076
1077         if (*ppath != '\\') {
1078                 d_printf("cli_resolve_path: "
1079                         "dfs_path (%s) not in correct format.\n",
1080                         dfs_path );
1081                 TALLOC_FREE(dfs_refs);
1082                 return NT_STATUS_NOT_FOUND;
1083         }
1084
1085         ppath++; /* Now pointing at start of server name. */
1086
1087         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
1088                 TALLOC_FREE(dfs_refs);
1089                 return NT_STATUS_NOT_FOUND;
1090         }
1091
1092         ppath++; /* Now pointing at start of share name. */
1093
1094         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1095                 TALLOC_FREE(dfs_refs);
1096                 return NT_STATUS_NOT_FOUND;
1097         }
1098
1099         ppath++; /* Now pointing at path component. */
1100
1101         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1102         if (!newmount) {
1103                 TALLOC_FREE(dfs_refs);
1104                 return NT_STATUS_NOT_FOUND;
1105         }
1106
1107         cli_set_mntpoint(*targetcli, newmount);
1108
1109         /* Check for another dfs referral, note that we are not
1110            checking for loops here. */
1111
1112         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1113                 status = cli_resolve_path(ctx,
1114                                           newmount,
1115                                           dfs_auth_info,
1116                                           *targetcli,
1117                                           *pp_targetpath,
1118                                           &newcli,
1119                                           &newpath);
1120                 if (NT_STATUS_IS_OK(status)) {
1121                         /*
1122                          * When cli_resolve_path returns true here it's always
1123                          * returning the complete path in newpath, so we're done
1124                          * here.
1125                          */
1126                         *targetcli = newcli;
1127                         *pp_targetpath = newpath;
1128                         TALLOC_FREE(dfs_refs);
1129                         return status;
1130                 }
1131         }
1132
1133   done:
1134
1135         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1136                 target_tcon = (*targetcli)->smb2.tcon;
1137         } else {
1138                 target_tcon = (*targetcli)->smb1.tcon;
1139         }
1140
1141         /* If returning true ensure we return a dfs root full path. */
1142         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1143                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1144                 if (!dfs_path) {
1145                         TALLOC_FREE(dfs_refs);
1146                         return NT_STATUS_NO_MEMORY;
1147                 }
1148                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1149                 if (*pp_targetpath == NULL) {
1150                         TALLOC_FREE(dfs_refs);
1151                         return NT_STATUS_NO_MEMORY;
1152                 }
1153         }
1154
1155         TALLOC_FREE(dfs_refs);
1156         return NT_STATUS_OK;
1157 }
1158
1159 /********************************************************************
1160 ********************************************************************/
1161
1162 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1163                                 struct cli_state *cli,
1164                                 const char *sharename,
1165                                 char **pp_newserver,
1166                                 char **pp_newshare,
1167                                 bool force_encrypt,
1168                                 const char *username,
1169                                 const char *password,
1170                                 const char *domain)
1171 {
1172         struct client_dfs_referral *refs = NULL;
1173         size_t num_refs = 0;
1174         size_t consumed = 0;
1175         char *fullpath = NULL;
1176         bool res;
1177         uint16_t cnum;
1178         char *newextrapath = NULL;
1179         NTSTATUS status;
1180         const char *remote_name;
1181
1182         if (!cli || !sharename) {
1183                 return false;
1184         }
1185
1186         remote_name = smbXcli_conn_remote_name(cli->conn);
1187         cnum = cli_state_get_tid(cli);
1188
1189         /* special case.  never check for a referral on the IPC$ share */
1190
1191         if (strequal(sharename, "IPC$")) {
1192                 return false;
1193         }
1194
1195         /* send a trans2_query_path_info to check for a referral */
1196
1197         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1198         if (!fullpath) {
1199                 return false;
1200         }
1201
1202         /* check for the referral */
1203
1204         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL, 0))) {
1205                 return false;
1206         }
1207
1208         if (force_encrypt) {
1209                 status = cli_cm_force_encryption(cli,
1210                                         username,
1211                                         password,
1212                                         domain,
1213                                         "IPC$");
1214                 if (!NT_STATUS_IS_OK(status)) {
1215                         return false;
1216                 }
1217         }
1218
1219         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1220                                       &num_refs, &consumed);
1221         res = NT_STATUS_IS_OK(status);
1222
1223         status = cli_tdis(cli);
1224         if (!NT_STATUS_IS_OK(status)) {
1225                 return false;
1226         }
1227
1228         cli_state_set_tid(cli, cnum);
1229
1230         if (!res || !num_refs) {
1231                 return false;
1232         }
1233
1234         if (!refs[0].dfspath) {
1235                 return false;
1236         }
1237
1238         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1239                             pp_newshare, &newextrapath)) {
1240                 return false;
1241         }
1242
1243         /* check that this is not a self-referral */
1244
1245         if (strequal(remote_name, *pp_newserver) &&
1246                         strequal(sharename, *pp_newshare)) {
1247                 return false;
1248         }
1249
1250         return true;
1251 }