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 #include "auth/credentials/credentials.h"
  30 #include "lib/param/param.h"
  31
  32 /********************************************************************
  33  Important point.
  34
  35  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  36  are not C escaped here).
  37
  38  - but if we're using POSIX paths then <pathname> may contain
  39    '/' separators, not '\\' separators. So cope with '\\' or '/'
  40    as a separator when looking at the pathname part.... JRA.
  41 ********************************************************************/
  42
  43 /********************************************************************
  44  Ensure a connection is encrypted.
  45 ********************************************************************/
  46
  47 static NTSTATUS cli_cm_force_encryption_creds(struct cli_state *c,
  48                                               struct cli_credentials *creds,
  49                                               const char *sharename)
  50 {
  51         uint16_t major, minor;
  52         uint32_t caplow, caphigh;
  53         NTSTATUS status;
  54         bool temp_ipc = false;
  55
  56         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
  57                 status = smb2cli_session_encryption_on(c->smb2.session);
  58                 if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  59                         d_printf("Encryption required and "
  60                                 "server doesn't support "
  61                                 "SMB3 encryption - failing connect\n");
  62                 } else if (!NT_STATUS_IS_OK(status)) {
  63                         d_printf("Encryption required and "
  64                                 "setup failed with error %s.\n",
  65                                 nt_errstr(status));
  66                 }
  67                 return status;
  68         }
  69
  70         if (!SERVER_HAS_UNIX_CIFS(c)) {
  71                 d_printf("Encryption required and "
  72                         "server that doesn't support "
  73                         "UNIX extensions - failing connect\n");
  74                 return NT_STATUS_NOT_SUPPORTED;
  75         }
  76
  77         if (c->smb1.tcon == NULL) {
  78                 status = cli_tree_connect_creds(c, "IPC$", "IPC", creds);
  79                 if (!NT_STATUS_IS_OK(status)) {
  80                         d_printf("Encryption required and "
  81                                 "can't connect to IPC$ to check "
  82                                 "UNIX CIFS extensions.\n");
  83                         return NT_STATUS_UNKNOWN_REVISION;
  84                 }
  85                 temp_ipc = true;
  86         }
  87
  88         status = cli_unix_extensions_version(c, &major, &minor, &caplow,
  89                                              &caphigh);
  90         if (!NT_STATUS_IS_OK(status)) {
  91                 d_printf("Encryption required and "
  92                         "can't get UNIX CIFS extensions "
  93                         "version from server.\n");
  94                 if (temp_ipc) {
  95                         cli_tdis(c);
  96                 }
  97                 return NT_STATUS_UNKNOWN_REVISION;
  98         }
  99
 100         if (!(caplow & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)) {
 101                 d_printf("Encryption required and "
 102                         "share %s doesn't support "
 103                         "encryption.\n", sharename);
 104                 if (temp_ipc) {
 105                         cli_tdis(c);
 106                 }
 107                 return NT_STATUS_UNSUPPORTED_COMPRESSION;
 108         }
 109
 110         status = cli_smb1_setup_encryption(c, creds);
 111         if (!NT_STATUS_IS_OK(status)) {
 112                 d_printf("Encryption required and "
 113                         "setup failed with error %s.\n",
 114                         nt_errstr(status));
 115                 if (temp_ipc) {
 116                         cli_tdis(c);
 117                 }
 118                 return status;
 119         }
 120
 121         if (temp_ipc) {
 122                 cli_tdis(c);
 123         }
 124         return NT_STATUS_OK;
 125 }
 126
 127 /********************************************************************
 128  Return a connection to a server.
 129 ********************************************************************/
 130
 131 static NTSTATUS do_connect(TALLOC_CTX *ctx,
 132                                         const char *server,
 133                                         const char *share,
 134                                         struct cli_credentials *creds,
 135                                         const struct sockaddr_storage *dest_ss,
 136                                         int port,
 137                                         int name_type,
 138                                         struct cli_state **pcli)
 139 {
 140         struct cli_state *c = NULL;
 141         char *servicename;
 142         char *sharename;
 143         char *newserver, *newshare;
 144         NTSTATUS status;
 145         int flags = 0;
 146         enum protocol_types protocol = PROTOCOL_NONE;
 147         enum smb_signing_setting signing_state =
 148                 cli_credentials_get_smb_signing(creds);
 149         enum smb_encryption_setting encryption_state =
 150                 cli_credentials_get_smb_encryption(creds);
 151
 152         if (encryption_state >= SMB_ENCRYPTION_DESIRED) {
 153                 signing_state = SMB_SIGNING_REQUIRED;
 154         }
 155
 156         /* make a copy so we don't modify the global string 'service' */
 157         servicename = talloc_strdup(ctx,share);
 158         if (!servicename) {
 159                 return NT_STATUS_NO_MEMORY;
 160         }
 161         sharename = servicename;
 162         if (*sharename == '\\') {
 163                 sharename += 2;
 164                 if (server == NULL) {
 165                         server = sharename;
 166                 }
 167                 sharename = strchr_m(sharename,'\\');
 168                 if (!sharename) {
 169                         return NT_STATUS_NO_MEMORY;
 170                 }
 171                 *sharename = 0;
 172                 sharename++;
 173         }
 174         if (server == NULL) {
 175                 return NT_STATUS_INVALID_PARAMETER;
 176         }
 177
 178         status = cli_connect_nb(
 179                 server, dest_ss, port, name_type, NULL,
 180                 signing_state,
 181                 flags, &c);
 182
 183         if (!NT_STATUS_IS_OK(status)) {
 184                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 185                         DBG_ERR("NetBIOS support disabled, unable to connect\n");
 186                 }
 187
 188                 DBG_WARNING("Connection to %s failed (Error %s)\n",
 189                             server,
 190                             nt_errstr(status));
 191                 return status;
 192         }
 193
 194         DEBUG(4,(" session request ok\n"));
 195
 196         status = smbXcli_negprot(c->conn, c->timeout,
 197                                  lp_client_min_protocol(),
 198                                  lp_client_max_protocol());
 199
 200         if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
 201                 d_printf("Protocol negotiation (with timeout %d ms) timed out against server %s\n",
 202                          c->timeout,
 203                          smbXcli_conn_remote_name(c->conn));
 204                 cli_shutdown(c);
 205                 return status;
 206         } else if (!NT_STATUS_IS_OK(status)) {
 207                 d_printf("Protocol negotiation to server %s (for a protocol between %s and %s) failed: %s\n",
 208                          smbXcli_conn_remote_name(c->conn),
 209                          lpcfg_get_smb_protocol(lp_client_min_protocol()),
 210                          lpcfg_get_smb_protocol(lp_client_max_protocol()),
 211                          nt_errstr(status));
 212                 cli_shutdown(c);
 213                 return status;
 214         }
 215         protocol = smbXcli_conn_protocol(c->conn);
 216         DEBUG(4,(" negotiated dialect[%s] against server[%s]\n",
 217                  smb_protocol_types_string(protocol),
 218                  smbXcli_conn_remote_name(c->conn)));
 219
 220         if (protocol >= PROTOCOL_SMB2_02) {
 221                 /* Ensure we ask for some initial credits. */
 222                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 223         }
 224
 225         status = cli_session_setup_creds(c, creds);
 226         if (!NT_STATUS_IS_OK(status)) {
 227                 /* If a password was not supplied then
 228                  * try again with a null username. */
 229                 if (encryption_state == SMB_ENCRYPTION_REQUIRED ||
 230                         smbXcli_conn_signing_mandatory(c->conn) ||
 231                         cli_credentials_authentication_requested(creds) ||
 232                         cli_credentials_is_anonymous(creds) ||
 233                         !NT_STATUS_IS_OK(status = cli_session_setup_anon(c)))
 234                 {
 235                         d_printf("session setup failed: %s\n",
 236                                  nt_errstr(status));
 237                         if (NT_STATUS_EQUAL(status,
 238                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 239                                 d_printf("did you forget to run kinit?\n");
 240                         cli_shutdown(c);
 241                         return status;
 242                 }
 243                 d_printf("Anonymous login successful\n");
 244         }
 245
 246         if (!NT_STATUS_IS_OK(status)) {
 247                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 248                 cli_shutdown(c);
 249                 return status;
 250         }
 251
 252         DEBUG(4,(" session setup ok\n"));
 253
 254         if (encryption_state >= SMB_ENCRYPTION_DESIRED) {
 255                 status = cli_cm_force_encryption_creds(c,
 256                                                        creds,
 257                                                        sharename);
 258                 if (!NT_STATUS_IS_OK(status)) {
 259                         switch (encryption_state) {
 260                         case SMB_ENCRYPTION_DESIRED:
 261                                 break;
 262                         case SMB_ENCRYPTION_REQUIRED:
 263                         default:
 264                                 cli_shutdown(c);
 265                                 return status;
 266                         }
 267                 }
 268         }
 269
 270         /* here's the fun part....to support 'msdfs proxy' shares
 271            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 272            here before trying to connect to the original share.
 273            cli_check_msdfs_proxy() will fail if it is a normal share. */
 274
 275         if (smbXcli_conn_dfs_supported(c->conn) &&
 276                         cli_check_msdfs_proxy(ctx, c, sharename,
 277                                 &newserver, &newshare,
 278                                 creds)) {
 279                 cli_shutdown(c);
 280                 return do_connect(ctx, newserver,
 281                                 newshare, creds,
 282                                 NULL, port, name_type, pcli);
 283         }
 284
 285         /* must be a normal share */
 286
 287         status = cli_tree_connect_creds(c, sharename, "?????", creds);
 288         if (!NT_STATUS_IS_OK(status)) {
 289                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 290                 cli_shutdown(c);
 291                 return status;
 292         }
 293
 294         DEBUG(4,(" tconx ok\n"));
 295         *pcli = c;
 296         return NT_STATUS_OK;
 297 }
 298
 299 /********************************************************************
 300  Add a new connection to the list.
 301  referring_cli == NULL means a new initial connection.
 302 ********************************************************************/
 303
 304 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 305                                struct cli_state *referring_cli,
 306                                const char *server,
 307                                const char *share,
 308                                struct cli_credentials *creds,
 309                                const struct sockaddr_storage *dest_ss,
 310                                int port,
 311                                int name_type,
 312                                struct cli_state **pcli)
 313 {
 314         struct cli_state *cli = NULL;
 315         NTSTATUS status;
 316
 317         status = do_connect(ctx, server, share,
 318                                 creds,
 319                                 dest_ss, port, name_type, &cli);
 320
 321         if (!NT_STATUS_IS_OK(status)) {
 322                 return status;
 323         }
 324
 325         /*
 326          * This can't happen, this test is to satisfy static
 327          * checkers (clang)
 328          */
 329         if (cli == NULL) {
 330                 return NT_STATUS_NO_MEMORY;
 331         }
 332
 333         /* Enter into the list. */
 334         if (referring_cli) {
 335                 DLIST_ADD_END(referring_cli, cli);
 336         }
 337
 338         if (referring_cli && referring_cli->requested_posix_capabilities) {
 339                 uint16_t major, minor;
 340                 uint32_t caplow, caphigh;
 341                 status = cli_unix_extensions_version(cli, &major, &minor,
 342                                                      &caplow, &caphigh);
 343                 if (NT_STATUS_IS_OK(status)) {
 344                         cli_set_unix_extensions_capabilities(cli,
 345                                         major, minor,
 346                                         caplow, caphigh);
 347                 }
 348         }
 349
 350         *pcli = cli;
 351         return NT_STATUS_OK;
 352 }
 353
 354 /********************************************************************
 355  Return a connection to a server on a particular share.
 356 ********************************************************************/
 357
 358 static struct cli_state *cli_cm_find(struct cli_state *cli,
 359                                 const char *server,
 360                                 const char *share)
 361 {
 362         struct cli_state *p;
 363
 364         if (cli == NULL) {
 365                 return NULL;
 366         }
 367
 368         /* Search to the start of the list. */
 369         for (p = cli; p; p = DLIST_PREV(p)) {
 370                 const char *remote_name =
 371                         smbXcli_conn_remote_name(p->conn);
 372
 373                 if (strequal(server, remote_name) &&
 374                                 strequal(share,p->share)) {
 375                         return p;
 376                 }
 377         }
 378
 379         /* Search to the end of the list. */
 380         for (p = cli->next; p; p = p->next) {
 381                 const char *remote_name =
 382                         smbXcli_conn_remote_name(p->conn);
 383
 384                 if (strequal(server, remote_name) &&
 385                                 strequal(share,p->share)) {
 386                         return p;
 387                 }
 388         }
 389
 390         return NULL;
 391 }
 392
 393 /****************************************************************************
 394  Open a client connection to a \\server\share.
 395 ****************************************************************************/
 396
 397 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 398                      struct cli_state *referring_cli,
 399                      const char *server,
 400                      const char *share,
 401                      struct cli_credentials *creds,
 402                      const struct sockaddr_storage *dest_ss,
 403                      int port,
 404                      int name_type,
 405                      struct cli_state **pcli)
 406 {
 407         /* Try to reuse an existing connection in this list. */
 408         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 409         NTSTATUS status;
 410
 411         if (c) {
 412                 *pcli = c;
 413                 return NT_STATUS_OK;
 414         }
 415
 416         if (creds == NULL) {
 417                 /* Can't do a new connection
 418                  * without auth info. */
 419                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 420                         "without client credentials\n",
 421                         server, share );
 422                 return NT_STATUS_INVALID_PARAMETER;
 423         }
 424
 425         status = cli_cm_connect(ctx,
 426                                 referring_cli,
 427                                 server,
 428                                 share,
 429                                 creds,
 430                                 dest_ss,
 431                                 port,
 432                                 name_type,
 433                                 &c);
 434         if (!NT_STATUS_IS_OK(status)) {
 435                 return status;
 436         }
 437         *pcli = c;
 438         return NT_STATUS_OK;
 439 }
 440
 441 /****************************************************************************
 442 ****************************************************************************/
 443
 444 void cli_cm_display(struct cli_state *cli)
 445 {
 446         int i;
 447
 448         for (i=0; cli; cli = cli->next,i++ ) {
 449                 d_printf("%d:\tserver=%s, share=%s\n",
 450                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 451         }
 452 }
 453
 454 /**********************************************************************
 455  split a dfs path into the server, share name, and extrapath components
 456 **********************************************************************/
 457
 458 static bool split_dfs_path(TALLOC_CTX *ctx,
 459                                 const char *nodepath,
 460                                 char **pp_server,
 461                                 char **pp_share,
 462                                 char **pp_extrapath)
 463 {
 464         char *p, *q;
 465         char *path;
 466
 467         *pp_server = NULL;
 468         *pp_share = NULL;
 469         *pp_extrapath = NULL;
 470
 471         path = talloc_strdup(ctx, nodepath);
 472         if (!path) {
 473                 goto fail;
 474         }
 475
 476         if ( path[0] != '\\' ) {
 477                 goto fail;
 478         }
 479
 480         p = strchr_m( path + 1, '\\' );
 481         if ( !p ) {
 482                 goto fail;
 483         }
 484
 485         *p = '\0';
 486         p++;
 487
 488         /* Look for any extra/deep path */
 489         q = strchr_m(p, '\\');
 490         if (q != NULL) {
 491                 *q = '\0';
 492                 q++;
 493                 *pp_extrapath = talloc_strdup(ctx, q);
 494         } else {
 495                 *pp_extrapath = talloc_strdup(ctx, "");
 496         }
 497         if (*pp_extrapath == NULL) {
 498                 goto fail;
 499         }
 500
 501         *pp_share = talloc_strdup(ctx, p);
 502         if (*pp_share == NULL) {
 503                 goto fail;
 504         }
 505
 506         *pp_server = talloc_strdup(ctx, &path[1]);
 507         if (*pp_server == NULL) {
 508                 goto fail;
 509         }
 510
 511         TALLOC_FREE(path);
 512         return true;
 513
 514 fail:
 515         TALLOC_FREE(*pp_share);
 516         TALLOC_FREE(*pp_extrapath);
 517         TALLOC_FREE(path);
 518         return false;
 519 }
 520
 521 /****************************************************************************
 522  Return the original path truncated at the directory component before
 523  the first wildcard character. Trust the caller to provide a NULL
 524  terminated string
 525 ****************************************************************************/
 526
 527 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 528 {
 529         size_t len;
 530         char *p1, *p2, *p;
 531         char *path_out;
 532
 533         /* No absolute paths. */
 534         while (IS_DIRECTORY_SEP(*path)) {
 535                 path++;
 536         }
 537
 538         path_out = talloc_strdup(ctx, path);
 539         if (!path_out) {
 540                 return NULL;
 541         }
 542
 543         p1 = strchr_m(path_out, '*');
 544         p2 = strchr_m(path_out, '?');
 545
 546         if (p1 || p2) {
 547                 if (p1 && p2) {
 548                         p = MIN(p1,p2);
 549                 } else if (!p1) {
 550                         p = p2;
 551                 } else {
 552                         p = p1;
 553                 }
 554                 *p = '\0';
 555
 556                 /* Now go back to the start of this component. */
 557                 p1 = strrchr_m(path_out, '/');
 558                 p2 = strrchr_m(path_out, '\\');
 559                 p = MAX(p1,p2);
 560                 if (p) {
 561                         *p = '\0';
 562                 }
 563         }
 564
 565         /* Strip any trailing separator */
 566
 567         len = strlen(path_out);
 568         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 569                 path_out[len-1] = '\0';
 570         }
 571
 572         return path_out;
 573 }
 574
 575 /****************************************************************************
 576 ****************************************************************************/
 577
 578 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 579                                         struct cli_state *cli,
 580                                         const char *dir)
 581 {
 582         char path_sep = '\\';
 583
 584         /* Ensure the extrapath doesn't start with a separator. */
 585         while (IS_DIRECTORY_SEP(*dir)) {
 586                 dir++;
 587         }
 588
 589         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 590                 path_sep = '/';
 591         }
 592         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 593                         path_sep,
 594                         smbXcli_conn_remote_name(cli->conn),
 595                         path_sep,
 596                         cli->share,
 597                         path_sep,
 598                         dir);
 599 }
 600
 601 /********************************************************************
 602  Check if a path has already been converted to DFS.
 603 ********************************************************************/
 604
 605 bool cli_dfs_is_already_full_path(struct cli_state *cli, const char *path)
 606 {
 607         const char *server = smbXcli_conn_remote_name(cli->conn);
 608         size_t server_len = strlen(server);
 609         bool found_server = false;
 610         const char *share = cli->share;
 611         size_t share_len = strlen(share);
 612         bool found_share = false;
 613
 614         if (!IS_DIRECTORY_SEP(path[0])) {
 615                 return false;
 616         }
 617         path++;
 618         found_server = (strncasecmp_m(path, server, server_len) == 0);
 619         if (!found_server) {
 620                 return false;
 621         }
 622         path += server_len;
 623         if (!IS_DIRECTORY_SEP(path[0])) {
 624                 return false;
 625         }
 626         path++;
 627         found_share = (strncasecmp_m(path, share, share_len) == 0);
 628         if (!found_share) {
 629                 return false;
 630         }
 631         path += share_len;
 632         if (path[0] == '\0') {
 633                 return true;
 634         }
 635         if (IS_DIRECTORY_SEP(path[0])) {
 636                 return true;
 637         }
 638         return false;
 639 }
 640
 641 /********************************************************************
 642  Get the dfs referral link.
 643 ********************************************************************/
 644
 645 NTSTATUS cli_dfs_get_referral_ex(TALLOC_CTX *ctx,
 646                         struct cli_state *cli,
 647                         const char *path,
 648                         uint16_t max_referral_level,
 649                         struct client_dfs_referral **refs,
 650                         size_t *num_refs,
 651                         size_t *consumed)
 652 {
 653         unsigned int param_len = 0;
 654         uint16_t recv_flags2;
 655         uint8_t *param = NULL;
 656         uint8_t *rdata = NULL;
 657         char *p;
 658         char *endp;
 659         smb_ucs2_t *path_ucs;
 660         char *consumed_path = NULL;
 661         uint16_t consumed_ucs;
 662         uint16_t num_referrals;
 663         struct client_dfs_referral *referrals = NULL;
 664         NTSTATUS status;
 665         TALLOC_CTX *frame = talloc_stackframe();
 666
 667         *num_refs = 0;
 668         *refs = NULL;
 669
 670         param = talloc_array(talloc_tos(), uint8_t, 2);
 671         if (!param) {
 672                 status = NT_STATUS_NO_MEMORY;
 673                 goto out;
 674         }
 675         SSVAL(param, 0, max_referral_level);
 676
 677         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 678                                       path, strlen(path)+1,
 679                                       NULL);
 680         if (!param) {
 681                 status = NT_STATUS_NO_MEMORY;
 682                 goto out;
 683         }
 684         param_len = talloc_get_size(param);
 685         path_ucs = (smb_ucs2_t *)&param[2];
 686
 687         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
 688                 DATA_BLOB in_input_buffer;
 689                 DATA_BLOB in_output_buffer = data_blob_null;
 690                 DATA_BLOB out_input_buffer = data_blob_null;
 691                 DATA_BLOB out_output_buffer = data_blob_null;
 692
 693                 in_input_buffer.data = param;
 694                 in_input_buffer.length = param_len;
 695
 696                 status = smb2cli_ioctl(cli->conn,
 697                                        cli->timeout,
 698                                        cli->smb2.session,
 699                                        cli->smb2.tcon,
 700                                        UINT64_MAX, /* in_fid_persistent */
 701                                        UINT64_MAX, /* in_fid_volatile */
 702                                        FSCTL_DFS_GET_REFERRALS,
 703                                        0, /* in_max_input_length */
 704                                        &in_input_buffer,
 705                                        CLI_BUFFER_SIZE, /* in_max_output_length */
 706                                        &in_output_buffer,
 707                                        SMB2_IOCTL_FLAG_IS_FSCTL,
 708                                        talloc_tos(),
 709                                        &out_input_buffer,
 710                                        &out_output_buffer);
 711                 if (!NT_STATUS_IS_OK(status)) {
 712                         goto out;
 713                 }
 714
 715                 if (out_output_buffer.length < 4) {
 716                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 717                         goto out;
 718                 }
 719
 720                 recv_flags2 = FLAGS2_UNICODE_STRINGS;
 721                 rdata = out_output_buffer.data;
 722                 endp = (char *)rdata + out_output_buffer.length;
 723         } else {
 724                 unsigned int data_len = 0;
 725                 uint16_t setup[1];
 726
 727                 SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 728
 729                 status = cli_trans(talloc_tos(), cli, SMBtrans2,
 730                                    NULL, 0xffff, 0, 0,
 731                                    setup, 1, 0,
 732                                    param, param_len, 2,
 733                                    NULL, 0, CLI_BUFFER_SIZE,
 734                                    &recv_flags2,
 735                                    NULL, 0, NULL, /* rsetup */
 736                                    NULL, 0, NULL,
 737                                    &rdata, 4, &data_len);
 738                 if (!NT_STATUS_IS_OK(status)) {
 739                         goto out;
 740                 }
 741
 742                 endp = (char *)rdata + data_len;
 743         }
 744
 745         consumed_ucs  = SVAL(rdata, 0);
 746         num_referrals = SVAL(rdata, 2);
 747
 748         /* consumed_ucs is the number of bytes
 749          * of the UCS2 path consumed not counting any
 750          * terminating null. We need to convert
 751          * back to unix charset and count again
 752          * to get the number of bytes consumed from
 753          * the incoming path. */
 754
 755         errno = 0;
 756         if (pull_string_talloc(talloc_tos(),
 757                         NULL,
 758                         0,
 759                         &consumed_path,
 760                         path_ucs,
 761                         consumed_ucs,
 762                         STR_UNICODE) == 0) {
 763                 if (errno != 0) {
 764                         status = map_nt_error_from_unix(errno);
 765                 } else {
 766                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 767                 }
 768                 goto out;
 769         }
 770         if (consumed_path == NULL) {
 771                 status = map_nt_error_from_unix(errno);
 772                 goto out;
 773         }
 774         *consumed = strlen(consumed_path);
 775
 776         if (num_referrals != 0) {
 777                 uint16_t ref_version;
 778                 uint16_t ref_size;
 779                 int i;
 780                 uint16_t node_offset;
 781
 782                 referrals = talloc_array(ctx, struct client_dfs_referral,
 783                                          num_referrals);
 784
 785                 if (!referrals) {
 786                         status = NT_STATUS_NO_MEMORY;
 787                         goto out;
 788                 }
 789                 /* start at the referrals array */
 790
 791                 p = (char *)rdata+8;
 792                 for (i=0; i<num_referrals && p < endp; i++) {
 793                         if (p + 18 > endp) {
 794                                 goto out;
 795                         }
 796                         ref_version = SVAL(p, 0);
 797                         ref_size    = SVAL(p, 2);
 798                         node_offset = SVAL(p, 16);
 799
 800                         if (ref_version != 3) {
 801                                 p += ref_size;
 802                                 continue;
 803                         }
 804
 805                         referrals[i].proximity = SVAL(p, 8);
 806                         referrals[i].ttl       = SVAL(p, 10);
 807
 808                         if (p + node_offset > endp) {
 809                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 810                                 goto out;
 811                         }
 812                         pull_string_talloc(referrals,
 813                                            (const char *)rdata,
 814                                            recv_flags2,
 815                                            &referrals[i].dfspath,
 816                                            p+node_offset,
 817                                            PTR_DIFF(endp, p+node_offset),
 818                                            STR_TERMINATE|STR_UNICODE);
 819
 820                         if (!referrals[i].dfspath) {
 821                                 status = map_nt_error_from_unix(errno);
 822                                 goto out;
 823                         }
 824                         p += ref_size;
 825                 }
 826                 if (i < num_referrals) {
 827                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 828                         goto out;
 829                 }
 830         }
 831
 832         *num_refs = num_referrals;
 833         *refs = referrals;
 834
 835   out:
 836
 837         TALLOC_FREE(frame);
 838         return status;
 839 }
 840
 841 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 842                         struct cli_state *cli,
 843                         const char *path,
 844                         struct client_dfs_referral **refs,
 845                         size_t *num_refs,
 846                         size_t *consumed)
 847 {
 848         return cli_dfs_get_referral_ex(ctx,
 849                                 cli,
 850                                 path,
 851                                 3,
 852                                 refs, /* Max referral level we want */
 853                                 num_refs,
 854                                 consumed);
 855 }
 856
 857 static bool cli_conn_have_dfs(struct cli_state *cli)
 858 {
 859         struct smbXcli_conn *conn = cli->conn;
 860         struct smbXcli_tcon *tcon = NULL;
 861         bool ok;
 862
 863         if (smbXcli_conn_protocol(conn) < PROTOCOL_SMB2_02) {
 864                 uint32_t capabilities = smb1cli_conn_capabilities(conn);
 865
 866                 if ((capabilities & CAP_STATUS32) == 0) {
 867                         return false;
 868                 }
 869                 if ((capabilities & CAP_UNICODE) == 0) {
 870                         return false;
 871                 }
 872
 873                 tcon = cli->smb1.tcon;
 874         } else {
 875                 tcon = cli->smb2.tcon;
 876         }
 877
 878         ok = smbXcli_tcon_is_dfs_share(tcon);
 879         return ok;
 880 }
 881
 882 /********************************************************************
 883 ********************************************************************/
 884 struct cli_dfs_path_split {
 885         char *server;
 886         char *share;
 887         char *extrapath;
 888 };
 889
 890 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 891                           const char *mountpt,
 892                           struct cli_credentials *creds,
 893                           struct cli_state *rootcli,
 894                           const char *path,
 895                           struct cli_state **targetcli,
 896                           char **pp_targetpath)
 897 {
 898         struct client_dfs_referral *refs = NULL;
 899         size_t num_refs = 0;
 900         size_t consumed = 0;
 901         struct cli_state *cli_ipc = NULL;
 902         char *dfs_path = NULL;
 903         char *cleanpath = NULL;
 904         char *extrapath = NULL;
 905         int pathlen;
 906         struct cli_state *newcli = NULL;
 907         struct cli_state *ccli = NULL;
 908         size_t count = 0;
 909         char *newpath = NULL;
 910         char *newmount = NULL;
 911         char *ppath = NULL;
 912         SMB_STRUCT_STAT sbuf;
 913         uint32_t attributes;
 914         NTSTATUS status;
 915         struct smbXcli_tcon *target_tcon = NULL;
 916         struct cli_dfs_path_split *dfs_refs = NULL;
 917         bool ok;
 918         bool is_already_dfs = false;
 919
 920         if ( !rootcli || !path || !targetcli ) {
 921                 return NT_STATUS_INVALID_PARAMETER;
 922         }
 923
 924         /*
 925          * Avoid more than one leading directory separator
 926          */
 927         while (IS_DIRECTORY_SEP(path[0]) && IS_DIRECTORY_SEP(path[1])) {
 928                 path++;
 929         }
 930
 931         ok = cli_conn_have_dfs(rootcli);
 932         if (!ok) {
 933                 *targetcli = rootcli;
 934                 *pp_targetpath = talloc_strdup(ctx, path);
 935                 if (!*pp_targetpath) {
 936                         return NT_STATUS_NO_MEMORY;
 937                 }
 938                 return NT_STATUS_OK;
 939         }
 940
 941         *targetcli = NULL;
 942
 943         is_already_dfs = cli_dfs_is_already_full_path(rootcli, path);
 944         if (is_already_dfs) {
 945                 const char *localpath = NULL;
 946                 /*
 947                  * Given path is already converted to DFS.
 948                  * Convert to a local path so clean_path()
 949                  * can correctly strip any wildcards.
 950                  */
 951                 status = cli_dfs_target_check(ctx,
 952                                               rootcli,
 953                                               path,
 954                                               &localpath);
 955                 if (!NT_STATUS_IS_OK(status)) {
 956                         return status;
 957                 }
 958                 path = localpath;
 959         }
 960
 961         /* Send a trans2_query_path_info to check for a referral. */
 962
 963         cleanpath = clean_path(ctx, path);
 964         if (!cleanpath) {
 965                 return NT_STATUS_NO_MEMORY;
 966         }
 967
 968         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 969         if (!dfs_path) {
 970                 return NT_STATUS_NO_MEMORY;
 971         }
 972
 973         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 974         if (NT_STATUS_IS_OK(status)) {
 975                 /* This is an ordinary path, just return it. */
 976                 *targetcli = rootcli;
 977                 *pp_targetpath = talloc_strdup(ctx, path);
 978                 if (!*pp_targetpath) {
 979                         return NT_STATUS_NO_MEMORY;
 980                 }
 981                 goto done;
 982         }
 983
 984         /* Special case where client asked for a path that does not exist */
 985
 986         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 987                 *targetcli = rootcli;
 988                 *pp_targetpath = talloc_strdup(ctx, path);
 989                 if (!*pp_targetpath) {
 990                         return NT_STATUS_NO_MEMORY;
 991                 }
 992                 goto done;
 993         }
 994
 995         /* We got an error, check for DFS referral. */
 996
 997         if (!NT_STATUS_EQUAL(status, NT_STATUS_PATH_NOT_COVERED)) {
 998                 return status;
 999         }
1000
1001         /* Check for the referral. */
1002
1003         status = cli_cm_open(ctx,
1004                              rootcli,
1005                              smbXcli_conn_remote_name(rootcli->conn),
1006                              "IPC$",
1007                              creds,
1008                              NULL, /* dest_ss not needed, we reuse the transport */
1009                              0,
1010                              0x20,
1011                              &cli_ipc);
1012         if (!NT_STATUS_IS_OK(status)) {
1013                 return status;
1014         }
1015
1016         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
1017                                       &num_refs, &consumed);
1018         if (!NT_STATUS_IS_OK(status)) {
1019                 return status;
1020         }
1021
1022         if (!num_refs || !refs[0].dfspath) {
1023                 return NT_STATUS_NOT_FOUND;
1024         }
1025
1026         /*
1027          * Bug#10123 - DFS referral entries can be provided in a random order,
1028          * so check the connection cache for each item to avoid unnecessary
1029          * reconnections.
1030          */
1031         dfs_refs = talloc_array(ctx, struct cli_dfs_path_split, num_refs);
1032         if (dfs_refs == NULL) {
1033                 return NT_STATUS_NO_MEMORY;
1034         }
1035
1036         for (count = 0; count < num_refs; count++) {
1037                 if (!split_dfs_path(dfs_refs, refs[count].dfspath,
1038                                     &dfs_refs[count].server,
1039                                     &dfs_refs[count].share,
1040                                     &dfs_refs[count].extrapath)) {
1041                         TALLOC_FREE(dfs_refs);
1042                         return NT_STATUS_NOT_FOUND;
1043                 }
1044
1045                 ccli = cli_cm_find(rootcli, dfs_refs[count].server,
1046                                    dfs_refs[count].share);
1047                 if (ccli != NULL) {
1048                         extrapath = dfs_refs[count].extrapath;
1049                         *targetcli = ccli;
1050                         break;
1051                 }
1052         }
1053
1054         /*
1055          * If no cached connection was found, then connect to the first live
1056          * referral server in the list.
1057          */
1058         for (count = 0; (ccli == NULL) && (count < num_refs); count++) {
1059                 /* Connect to the target server & share */
1060                 status = cli_cm_connect(ctx, rootcli,
1061                                 dfs_refs[count].server,
1062                                 dfs_refs[count].share,
1063                                 creds,
1064                                 NULL, /* dest_ss */
1065                                 0, /* port */
1066                                 0x20,
1067                                 targetcli);
1068                 if (!NT_STATUS_IS_OK(status)) {
1069                         d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
1070                                  dfs_refs[count].server,
1071                                  dfs_refs[count].share);
1072                         continue;
1073                 } else {
1074                         extrapath = dfs_refs[count].extrapath;
1075                         break;
1076                 }
1077         }
1078
1079         /* No available referral server for the connection */
1080         if (*targetcli == NULL) {
1081                 TALLOC_FREE(dfs_refs);
1082                 return status;
1083         }
1084
1085         /* Make sure to recreate the original string including any wildcards. */
1086
1087         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
1088         if (!dfs_path) {
1089                 TALLOC_FREE(dfs_refs);
1090                 return NT_STATUS_NO_MEMORY;
1091         }
1092         pathlen = strlen(dfs_path);
1093         consumed = MIN(pathlen, consumed);
1094         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
1095         if (!*pp_targetpath) {
1096                 TALLOC_FREE(dfs_refs);
1097                 return NT_STATUS_NO_MEMORY;
1098         }
1099         dfs_path[consumed] = '\0';
1100
1101         /*
1102          * *pp_targetpath is now the unconsumed part of the path.
1103          * dfs_path is now the consumed part of the path
1104          * (in \server\share\path format).
1105          */
1106
1107         if (extrapath && strlen(extrapath) > 0) {
1108                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
1109                 /* put the trailing \ on the path, so to be safe we put one in if needed */
1110                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
1111                         *pp_targetpath = talloc_asprintf(ctx,
1112                                                   "%s\\%s",
1113                                                   extrapath,
1114                                                   *pp_targetpath);
1115                 } else {
1116                         *pp_targetpath = talloc_asprintf(ctx,
1117                                                   "%s%s",
1118                                                   extrapath,
1119                                                   *pp_targetpath);
1120                 }
1121                 if (!*pp_targetpath) {
1122                         TALLOC_FREE(dfs_refs);
1123                         return NT_STATUS_NO_MEMORY;
1124                 }
1125         }
1126
1127         /* parse out the consumed mount path */
1128         /* trim off the \server\share\ */
1129
1130         ppath = dfs_path;
1131
1132         if (*ppath != '\\') {
1133                 d_printf("cli_resolve_path: "
1134                         "dfs_path (%s) not in correct format.\n",
1135                         dfs_path );
1136                 TALLOC_FREE(dfs_refs);
1137                 return NT_STATUS_NOT_FOUND;
1138         }
1139
1140         ppath++; /* Now pointing at start of server name. */
1141
1142         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
1143                 TALLOC_FREE(dfs_refs);
1144                 return NT_STATUS_NOT_FOUND;
1145         }
1146
1147         ppath++; /* Now pointing at start of share name. */
1148
1149         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1150                 TALLOC_FREE(dfs_refs);
1151                 return NT_STATUS_NOT_FOUND;
1152         }
1153
1154         ppath++; /* Now pointing at path component. */
1155
1156         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1157         if (!newmount) {
1158                 TALLOC_FREE(dfs_refs);
1159                 return NT_STATUS_NOT_FOUND;
1160         }
1161
1162         /* Check for another dfs referral, note that we are not
1163            checking for loops here. */
1164
1165         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1166                 status = cli_resolve_path(ctx,
1167                                           newmount,
1168                                           creds,
1169                                           *targetcli,
1170                                           *pp_targetpath,
1171                                           &newcli,
1172                                           &newpath);
1173                 if (NT_STATUS_IS_OK(status)) {
1174                         /*
1175                          * When cli_resolve_path returns true here it's always
1176                          * returning the complete path in newpath, so we're done
1177                          * here.
1178                          */
1179                         *targetcli = newcli;
1180                         *pp_targetpath = newpath;
1181                         TALLOC_FREE(dfs_refs);
1182                         return status;
1183                 }
1184         }
1185
1186   done:
1187
1188         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1189                 target_tcon = (*targetcli)->smb2.tcon;
1190         } else {
1191                 target_tcon = (*targetcli)->smb1.tcon;
1192         }
1193
1194         /* If returning true ensure we return a dfs root full path. */
1195         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1196                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1197                 if (!dfs_path) {
1198                         TALLOC_FREE(dfs_refs);
1199                         return NT_STATUS_NO_MEMORY;
1200                 }
1201                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1202                 if (*pp_targetpath == NULL) {
1203                         TALLOC_FREE(dfs_refs);
1204                         return NT_STATUS_NO_MEMORY;
1205                 }
1206         }
1207
1208         TALLOC_FREE(dfs_refs);
1209         return NT_STATUS_OK;
1210 }
1211
1212 /********************************************************************
1213 ********************************************************************/
1214
1215 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1216                                 struct cli_state *cli,
1217                                 const char *sharename,
1218                                 char **pp_newserver,
1219                                 char **pp_newshare,
1220                                 struct cli_credentials *creds)
1221 {
1222         struct client_dfs_referral *refs = NULL;
1223         size_t num_refs = 0;
1224         size_t consumed = 0;
1225         char *fullpath = NULL;
1226         bool res;
1227         struct smbXcli_tcon *orig_tcon = NULL;
1228         char *orig_share = NULL;
1229         char *newextrapath = NULL;
1230         NTSTATUS status;
1231         const char *remote_name;
1232         enum smb_encryption_setting encryption_state =
1233                 cli_credentials_get_smb_encryption(creds);
1234
1235         if (!cli || !sharename) {
1236                 return false;
1237         }
1238
1239         remote_name = smbXcli_conn_remote_name(cli->conn);
1240
1241         /* special case.  never check for a referral on the IPC$ share */
1242
1243         if (strequal(sharename, "IPC$")) {
1244                 return false;
1245         }
1246
1247         /* send a trans2_query_path_info to check for a referral */
1248
1249         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1250         if (!fullpath) {
1251                 return false;
1252         }
1253
1254         /* Store tcon state. */
1255         if (cli_state_has_tcon(cli)) {
1256                 cli_state_save_tcon_share(cli, &orig_tcon, &orig_share);
1257         }
1258
1259         /* check for the referral */
1260
1261         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
1262                 cli_state_restore_tcon_share(cli, orig_tcon, orig_share);
1263                 return false;
1264         }
1265
1266         if (encryption_state >= SMB_ENCRYPTION_DESIRED) {
1267                 status = cli_cm_force_encryption_creds(cli, creds, "IPC$");
1268                 if (!NT_STATUS_IS_OK(status)) {
1269                         switch (encryption_state) {
1270                         case SMB_ENCRYPTION_DESIRED:
1271                                 break;
1272                         case SMB_ENCRYPTION_REQUIRED:
1273                         default:
1274                                 /*
1275                                  * Failed to set up encryption.
1276                                  * Disconnect the temporary IPC$
1277                                  * tcon before restoring the original
1278                                  * tcon so we don't leak it.
1279                                  */
1280                                 cli_tdis(cli);
1281                                 cli_state_restore_tcon_share(cli,
1282                                                              orig_tcon,
1283                                                              orig_share);
1284                                 return false;
1285                         }
1286                 }
1287         }
1288
1289         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1290                                       &num_refs, &consumed);
1291         res = NT_STATUS_IS_OK(status);
1292
1293         status = cli_tdis(cli);
1294
1295         cli_state_restore_tcon_share(cli, orig_tcon, orig_share);
1296
1297         if (!NT_STATUS_IS_OK(status)) {
1298                 return false;
1299         }
1300
1301         if (!res || !num_refs) {
1302                 return false;
1303         }
1304
1305         if (!refs[0].dfspath) {
1306                 return false;
1307         }
1308
1309         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1310                             pp_newshare, &newextrapath)) {
1311                 return false;
1312         }
1313
1314         /* check that this is not a self-referral */
1315
1316         if (strequal(remote_name, *pp_newserver) &&
1317                         strequal(sharename, *pp_newshare)) {
1318                 return false;
1319         }
1320
1321         return true;
1322 }
1323
1324 /********************************************************************
1325  Windows and NetApp (and arguably the SMB1/2/3 specs) expect a non-DFS
1326  path for the targets of rename and hardlink. If we have been given
1327  a DFS path for these calls, convert it back into a local path by
1328  stripping off the DFS prefix.
1329 ********************************************************************/
1330
1331 NTSTATUS cli_dfs_target_check(TALLOC_CTX *mem_ctx,
1332                         struct cli_state *cli,
1333                         const char *fname_dst,
1334                         const char **fname_dst_out)
1335 {
1336         char *dfs_prefix = NULL;
1337         size_t prefix_len = 0;
1338         struct smbXcli_tcon *tcon = NULL;
1339
1340         if (!smbXcli_conn_dfs_supported(cli->conn)) {
1341                 goto copy_fname_out;
1342         }
1343         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
1344                 tcon = cli->smb2.tcon;
1345         } else {
1346                 tcon = cli->smb1.tcon;
1347         }
1348         if (!smbXcli_tcon_is_dfs_share(tcon)) {
1349                 goto copy_fname_out;
1350         }
1351         dfs_prefix = cli_dfs_make_full_path(mem_ctx, cli, "");
1352         if (dfs_prefix == NULL) {
1353                 return NT_STATUS_NO_MEMORY;
1354         }
1355         prefix_len = strlen(dfs_prefix);
1356         if (strncmp(fname_dst, dfs_prefix, prefix_len) != 0) {
1357                 /*
1358                  * Prefix doesn't match. Assume it was
1359                  * already stripped or not added in the
1360                  * first place.
1361                  */
1362                 goto copy_fname_out;
1363         }
1364         /* Return the trailing name after the prefix. */
1365         *fname_dst_out = &fname_dst[prefix_len];
1366         TALLOC_FREE(dfs_prefix);
1367         return NT_STATUS_OK;
1368
1369   copy_fname_out:
1370
1371         /*
1372          * No change to the destination name. Just
1373          * point it at the incoming destination name.
1374          */
1375         *fname_dst_out = fname_dst;
1376         TALLOC_FREE(dfs_prefix);
1377         return NT_STATUS_OK;
1378 }
1379
1380 /********************************************************************
1381  Convert a pathname into a DFS path if it hasn't already been converted.
1382  Always returns a talloc'ed path, makes it easy to pass const paths in.
1383 ********************************************************************/
1384
1385 char *smb1_dfs_share_path(TALLOC_CTX *ctx,
1386                           struct cli_state *cli,
1387                           const char *path)
1388 {
1389         bool is_dfs = smbXcli_conn_dfs_supported(cli->conn) &&
1390                         smbXcli_tcon_is_dfs_share(cli->smb1.tcon);
1391         bool is_already_dfs_path = false;
1392         bool posix = (cli->requested_posix_capabilities &
1393                         CIFS_UNIX_POSIX_PATHNAMES_CAP);
1394         char sepchar = (posix ? '/' : '\\');
1395
1396         if (!is_dfs) {
1397                 return talloc_strdup(ctx, path);
1398         }
1399         is_already_dfs_path = cli_dfs_is_already_full_path(cli, path);
1400         if (is_already_dfs_path) {
1401                 return talloc_strdup(ctx, path);
1402         }
1403         /*
1404          * We don't use cli_dfs_make_full_path() as,
1405          * when given a null path, cli_dfs_make_full_path
1406          * deliberately adds a trailing '\\' (this is by
1407          * design to check for an existing DFS prefix match).
1408          */
1409         if (path[0] == '\0') {
1410                 return talloc_asprintf(ctx,
1411                                        "%c%s%c%s",
1412                                        sepchar,
1413                                        smbXcli_conn_remote_name(cli->conn),
1414                                        sepchar,
1415                                        cli->share);
1416         }
1417         while (*path == sepchar) {
1418                 path++;
1419         }
1420         return talloc_asprintf(ctx,
1421                                "%c%s%c%s%c%s",
1422                                sepchar,
1423                                smbXcli_conn_remote_name(cli->conn),
1424                                sepchar,
1425                                cli->share,
1426                                sepchar,
1427                                path);
1428 }