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 = cli_force_encryption(c,
  52                                         username,
  53                                         password,
  54                                         domain);
  55
  56         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  57                 d_printf("Encryption required and "
  58                         "server that doesn't support "
  59                         "UNIX extensions - failing connect\n");
  60         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  61                 d_printf("Encryption required and "
  62                         "can't get UNIX CIFS extensions "
  63                         "version from server.\n");
  64         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  65                 d_printf("Encryption required and "
  66                         "share %s doesn't support "
  67                         "encryption.\n", sharename);
  68         } else if (!NT_STATUS_IS_OK(status)) {
  69                 d_printf("Encryption required and "
  70                         "setup failed with error %s.\n",
  71                         nt_errstr(status));
  72         }
  73
  74         return status;
  75 }
  76
  77 /********************************************************************
  78  Return a connection to a server.
  79 ********************************************************************/
  80
  81 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  82                                         const char *server,
  83                                         const char *share,
  84                                         const struct user_auth_info *auth_info,
  85                                         bool show_sessetup,
  86                                         bool force_encrypt,
  87                                         int max_protocol,
  88                                         int port,
  89                                         int name_type,
  90                                         struct cli_state **pcli)
  91 {
  92         struct cli_state *c = NULL;
  93         char *servicename;
  94         char *sharename;
  95         char *newserver, *newshare;
  96         const char *username;
  97         const char *password;
  98         NTSTATUS status;
  99         int flags = 0;
 100
 101         /* make a copy so we don't modify the global string 'service' */
 102         servicename = talloc_strdup(ctx,share);
 103         if (!servicename) {
 104                 return NT_STATUS_NO_MEMORY;
 105         }
 106         sharename = servicename;
 107         if (*sharename == '\\') {
 108                 sharename += 2;
 109                 if (server == NULL) {
 110                         server = sharename;
 111                 }
 112                 sharename = strchr_m(sharename,'\\');
 113                 if (!sharename) {
 114                         return NT_STATUS_NO_MEMORY;
 115                 }
 116                 *sharename = 0;
 117                 sharename++;
 118         }
 119         if (server == NULL) {
 120                 return NT_STATUS_INVALID_PARAMETER;
 121         }
 122
 123         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 124                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 125         }
 126         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 127                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 128         }
 129         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 130                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 131         }
 132         if (get_cmdline_auth_info_use_pw_nt_hash(auth_info)) {
 133                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 134         }
 135
 136         status = cli_connect_nb(
 137                 server, NULL, port, name_type, NULL,
 138                 get_cmdline_auth_info_signing_state(auth_info),
 139                 flags, &c);
 140
 141         if (!NT_STATUS_IS_OK(status)) {
 142                 d_printf("Connection to %s failed (Error %s)\n",
 143                                 server,
 144                                 nt_errstr(status));
 145                 return status;
 146         }
 147
 148         if (max_protocol == 0) {
 149                 max_protocol = PROTOCOL_NT1;
 150         }
 151         DEBUG(4,(" session request ok\n"));
 152
 153         status = smbXcli_negprot(c->conn, c->timeout, PROTOCOL_CORE,
 154                                  max_protocol);
 155
 156         if (!NT_STATUS_IS_OK(status)) {
 157                 d_printf("protocol negotiation failed: %s\n",
 158                          nt_errstr(status));
 159                 cli_shutdown(c);
 160                 return status;
 161         }
 162
 163         username = get_cmdline_auth_info_username(auth_info);
 164         password = get_cmdline_auth_info_password(auth_info);
 165
 166         status = cli_session_setup(c, username,
 167                                    password, strlen(password),
 168                                    password, strlen(password),
 169                                    lp_workgroup());
 170         if (!NT_STATUS_IS_OK(status)) {
 171                 /* If a password was not supplied then
 172                  * try again with a null username. */
 173                 if (password[0] || !username[0] ||
 174                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 175                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 176                                                 "", 0,
 177                                                 "", 0,
 178                                                lp_workgroup()))) {
 179                         d_printf("session setup failed: %s\n",
 180                                  nt_errstr(status));
 181                         if (NT_STATUS_EQUAL(status,
 182                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 183                                 d_printf("did you forget to run kinit?\n");
 184                         cli_shutdown(c);
 185                         return status;
 186                 }
 187                 d_printf("Anonymous login successful\n");
 188                 status = cli_init_creds(c, "", lp_workgroup(), "");
 189         } else {
 190                 status = cli_init_creds(c, username, lp_workgroup(), password);
 191         }
 192
 193         if (!NT_STATUS_IS_OK(status)) {
 194                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 195                 cli_shutdown(c);
 196                 return status;
 197         }
 198
 199         if ( show_sessetup ) {
 200                 if (*c->server_domain) {
 201                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 202                                 c->server_domain,c->server_os,c->server_type));
 203                 } else if (*c->server_os || *c->server_type) {
 204                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 205                                  c->server_os,c->server_type));
 206                 }
 207         }
 208         DEBUG(4,(" session setup ok\n"));
 209
 210         /* here's the fun part....to support 'msdfs proxy' shares
 211            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 212            here before trying to connect to the original share.
 213            cli_check_msdfs_proxy() will fail if it is a normal share. */
 214
 215         if ((smb1cli_conn_capabilities(c->conn) & CAP_DFS) &&
 216                         cli_check_msdfs_proxy(ctx, c, sharename,
 217                                 &newserver, &newshare,
 218                                 force_encrypt,
 219                                 username,
 220                                 password,
 221                                 lp_workgroup())) {
 222                 cli_shutdown(c);
 223                 return do_connect(ctx, newserver,
 224                                 newshare, auth_info, false,
 225                                 force_encrypt, max_protocol,
 226                                 port, name_type, pcli);
 227         }
 228
 229         /* must be a normal share */
 230
 231         status = cli_tree_connect(c, sharename, "?????",
 232                                   password, strlen(password)+1);
 233         if (!NT_STATUS_IS_OK(status)) {
 234                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 235                 cli_shutdown(c);
 236                 return status;
 237         }
 238
 239         if (force_encrypt) {
 240                 status = cli_cm_force_encryption(c,
 241                                         username,
 242                                         password,
 243                                         lp_workgroup(),
 244                                         sharename);
 245                 if (!NT_STATUS_IS_OK(status)) {
 246                         cli_shutdown(c);
 247                         return status;
 248                 }
 249         }
 250
 251         DEBUG(4,(" tconx ok\n"));
 252         *pcli = c;
 253         return NT_STATUS_OK;
 254 }
 255
 256 /****************************************************************************
 257 ****************************************************************************/
 258
 259 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 260 {
 261         char *name = clean_name(NULL, mnt);
 262         if (!name) {
 263                 return;
 264         }
 265         TALLOC_FREE(cli->dfs_mountpoint);
 266         cli->dfs_mountpoint = talloc_strdup(cli, name);
 267         TALLOC_FREE(name);
 268 }
 269
 270 /********************************************************************
 271  Add a new connection to the list.
 272  referring_cli == NULL means a new initial connection.
 273 ********************************************************************/
 274
 275 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 276                                struct cli_state *referring_cli,
 277                                const char *server,
 278                                const char *share,
 279                                const struct user_auth_info *auth_info,
 280                                bool show_hdr,
 281                                bool force_encrypt,
 282                                int max_protocol,
 283                                int port,
 284                                int name_type,
 285                                struct cli_state **pcli)
 286 {
 287         struct cli_state *cli;
 288         NTSTATUS status;
 289
 290         status = do_connect(ctx, server, share,
 291                                 auth_info,
 292                                 show_hdr, force_encrypt, max_protocol,
 293                                 port, name_type, &cli);
 294
 295         if (!NT_STATUS_IS_OK(status)) {
 296                 return status;
 297         }
 298
 299         /* Enter into the list. */
 300         if (referring_cli) {
 301                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 302         }
 303
 304         if (referring_cli && referring_cli->requested_posix_capabilities) {
 305                 uint16 major, minor;
 306                 uint32 caplow, caphigh;
 307                 status = cli_unix_extensions_version(cli, &major, &minor,
 308                                                      &caplow, &caphigh);
 309                 if (NT_STATUS_IS_OK(status)) {
 310                         cli_set_unix_extensions_capabilities(cli,
 311                                         major, minor,
 312                                         caplow, caphigh);
 313                 }
 314         }
 315
 316         *pcli = cli;
 317         return NT_STATUS_OK;
 318 }
 319
 320 /********************************************************************
 321  Return a connection to a server on a particular share.
 322 ********************************************************************/
 323
 324 static struct cli_state *cli_cm_find(struct cli_state *cli,
 325                                 const char *server,
 326                                 const char *share)
 327 {
 328         struct cli_state *p;
 329
 330         if (cli == NULL) {
 331                 return NULL;
 332         }
 333
 334         /* Search to the start of the list. */
 335         for (p = cli; p; p = DLIST_PREV(p)) {
 336                 const char *remote_name =
 337                         smbXcli_conn_remote_name(p->conn);
 338
 339                 if (strequal(server, remote_name) &&
 340                                 strequal(share,p->share)) {
 341                         return p;
 342                 }
 343         }
 344
 345         /* Search to the end of the list. */
 346         for (p = cli->next; p; p = p->next) {
 347                 const char *remote_name =
 348                         smbXcli_conn_remote_name(p->conn);
 349
 350                 if (strequal(server, remote_name) &&
 351                                 strequal(share,p->share)) {
 352                         return p;
 353                 }
 354         }
 355
 356         return NULL;
 357 }
 358
 359 /****************************************************************************
 360  Open a client connection to a \\server\share.
 361 ****************************************************************************/
 362
 363 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 364                                 struct cli_state *referring_cli,
 365                                 const char *server,
 366                                 const char *share,
 367                                 const struct user_auth_info *auth_info,
 368                                 bool show_hdr,
 369                                 bool force_encrypt,
 370                                 int max_protocol,
 371                                 int port,
 372                                 int name_type,
 373                                 struct cli_state **pcli)
 374 {
 375         /* Try to reuse an existing connection in this list. */
 376         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 377         NTSTATUS status;
 378
 379         if (c) {
 380                 *pcli = c;
 381                 return NT_STATUS_OK;
 382         }
 383
 384         if (auth_info == NULL) {
 385                 /* Can't do a new connection
 386                  * without auth info. */
 387                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 388                         "without auth info\n",
 389                         server, share );
 390                 return NT_STATUS_INVALID_PARAMETER;
 391         }
 392
 393         status = cli_cm_connect(ctx,
 394                                 referring_cli,
 395                                 server,
 396                                 share,
 397                                 auth_info,
 398                                 show_hdr,
 399                                 force_encrypt,
 400                                 max_protocol,
 401                                 port,
 402                                 name_type,
 403                                 &c);
 404         if (!NT_STATUS_IS_OK(status)) {
 405                 return status;
 406         }
 407         *pcli = c;
 408         return NT_STATUS_OK;
 409 }
 410
 411 /****************************************************************************
 412 ****************************************************************************/
 413
 414 void cli_cm_display(struct cli_state *cli)
 415 {
 416         int i;
 417
 418         for (i=0; cli; cli = cli->next,i++ ) {
 419                 d_printf("%d:\tserver=%s, share=%s\n",
 420                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 421         }
 422 }
 423
 424 /****************************************************************************
 425 ****************************************************************************/
 426
 427 /****************************************************************************
 428 ****************************************************************************/
 429
 430 #if 0
 431 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 432 {
 433         SAFE_FREE(cm_creds.username);
 434         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 435                                                auth_info));
 436
 437         if (get_cmdline_auth_info_got_pass(auth_info)) {
 438                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 439         }
 440
 441         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 442         cm_creds.fallback_after_kerberos = false;
 443         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 444 }
 445 #endif
 446
 447 /**********************************************************************
 448  split a dfs path into the server, share name, and extrapath components
 449 **********************************************************************/
 450
 451 static bool split_dfs_path(TALLOC_CTX *ctx,
 452                                 const char *nodepath,
 453                                 char **pp_server,
 454                                 char **pp_share,
 455                                 char **pp_extrapath)
 456 {
 457         char *p, *q;
 458         char *path;
 459
 460         *pp_server = NULL;
 461         *pp_share = NULL;
 462         *pp_extrapath = NULL;
 463
 464         path = talloc_strdup(ctx, nodepath);
 465         if (!path) {
 466                 goto fail;
 467         }
 468
 469         if ( path[0] != '\\' ) {
 470                 goto fail;
 471         }
 472
 473         p = strchr_m( path + 1, '\\' );
 474         if ( !p ) {
 475                 goto fail;
 476         }
 477
 478         *p = '\0';
 479         p++;
 480
 481         /* Look for any extra/deep path */
 482         q = strchr_m(p, '\\');
 483         if (q != NULL) {
 484                 *q = '\0';
 485                 q++;
 486                 *pp_extrapath = talloc_strdup(ctx, q);
 487         } else {
 488                 *pp_extrapath = talloc_strdup(ctx, "");
 489         }
 490         if (*pp_extrapath == NULL) {
 491                 goto fail;
 492         }
 493
 494         *pp_share = talloc_strdup(ctx, p);
 495         if (*pp_share == NULL) {
 496                 goto fail;
 497         }
 498
 499         *pp_server = talloc_strdup(ctx, &path[1]);
 500         if (*pp_server == NULL) {
 501                 goto fail;
 502         }
 503
 504         TALLOC_FREE(path);
 505         return true;
 506
 507 fail:
 508         TALLOC_FREE(*pp_share);
 509         TALLOC_FREE(*pp_extrapath);
 510         TALLOC_FREE(path);
 511         return false;
 512 }
 513
 514 /****************************************************************************
 515  Return the original path truncated at the directory component before
 516  the first wildcard character. Trust the caller to provide a NULL
 517  terminated string
 518 ****************************************************************************/
 519
 520 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 521 {
 522         size_t len;
 523         char *p1, *p2, *p;
 524         char *path_out;
 525
 526         /* No absolute paths. */
 527         while (IS_DIRECTORY_SEP(*path)) {
 528                 path++;
 529         }
 530
 531         path_out = talloc_strdup(ctx, path);
 532         if (!path_out) {
 533                 return NULL;
 534         }
 535
 536         p1 = strchr_m(path_out, '*');
 537         p2 = strchr_m(path_out, '?');
 538
 539         if (p1 || p2) {
 540                 if (p1 && p2) {
 541                         p = MIN(p1,p2);
 542                 } else if (!p1) {
 543                         p = p2;
 544                 } else {
 545                         p = p1;
 546                 }
 547                 *p = '\0';
 548
 549                 /* Now go back to the start of this component. */
 550                 p1 = strrchr_m(path_out, '/');
 551                 p2 = strrchr_m(path_out, '\\');
 552                 p = MAX(p1,p2);
 553                 if (p) {
 554                         *p = '\0';
 555                 }
 556         }
 557
 558         /* Strip any trailing separator */
 559
 560         len = strlen(path_out);
 561         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 562                 path_out[len-1] = '\0';
 563         }
 564
 565         return path_out;
 566 }
 567
 568 /****************************************************************************
 569 ****************************************************************************/
 570
 571 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 572                                         struct cli_state *cli,
 573                                         const char *dir)
 574 {
 575         char path_sep = '\\';
 576
 577         /* Ensure the extrapath doesn't start with a separator. */
 578         while (IS_DIRECTORY_SEP(*dir)) {
 579                 dir++;
 580         }
 581
 582         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 583                 path_sep = '/';
 584         }
 585         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 586                         path_sep,
 587                         smbXcli_conn_remote_name(cli->conn),
 588                         path_sep,
 589                         cli->share,
 590                         path_sep,
 591                         dir);
 592 }
 593
 594 /********************************************************************
 595  check for dfs referral
 596 ********************************************************************/
 597
 598 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 599                                 NTSTATUS status)
 600 {
 601         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 602
 603         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_UNICODE)) {
 604                 return false;
 605         }
 606         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 607                 return false;
 608         }
 609         if (NT_STATUS_EQUAL(status, expected)) {
 610                 return true;
 611         }
 612         return false;
 613 }
 614
 615 /********************************************************************
 616  Get the dfs referral link.
 617 ********************************************************************/
 618
 619 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 620                         struct cli_state *cli,
 621                         const char *path,
 622                         struct client_dfs_referral **refs,
 623                         size_t *num_refs,
 624                         size_t *consumed)
 625 {
 626         unsigned int data_len = 0;
 627         unsigned int param_len = 0;
 628         uint16_t setup[1];
 629         uint16_t recv_flags2;
 630         uint8_t *param = NULL;
 631         uint8_t *rdata = NULL;
 632         char *p;
 633         char *endp;
 634         smb_ucs2_t *path_ucs;
 635         char *consumed_path = NULL;
 636         uint16_t consumed_ucs;
 637         uint16 num_referrals;
 638         struct client_dfs_referral *referrals = NULL;
 639         NTSTATUS status;
 640         TALLOC_CTX *frame = talloc_stackframe();
 641
 642         *num_refs = 0;
 643         *refs = NULL;
 644
 645         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 646
 647         param = talloc_array(talloc_tos(), uint8_t, 2);
 648         if (!param) {
 649                 status = NT_STATUS_NO_MEMORY;
 650                 goto out;
 651         }
 652         SSVAL(param, 0, 0x03);  /* max referral level */
 653
 654         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 655                                       path, strlen(path)+1,
 656                                       NULL);
 657         if (!param) {
 658                 status = NT_STATUS_NO_MEMORY;
 659                 goto out;
 660         }
 661         param_len = talloc_get_size(param);
 662         path_ucs = (smb_ucs2_t *)&param[2];
 663
 664         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 665                            NULL, 0xffff, 0, 0,
 666                            setup, 1, 0,
 667                            param, param_len, 2,
 668                            NULL, 0, CLI_BUFFER_SIZE,
 669                            &recv_flags2,
 670                            NULL, 0, NULL, /* rsetup */
 671                            NULL, 0, NULL,
 672                            &rdata, 4, &data_len);
 673         if (!NT_STATUS_IS_OK(status)) {
 674                 goto out;
 675         }
 676
 677         endp = (char *)rdata + data_len;
 678
 679         consumed_ucs  = SVAL(rdata, 0);
 680         num_referrals = SVAL(rdata, 2);
 681
 682         /* consumed_ucs is the number of bytes
 683          * of the UCS2 path consumed not counting any
 684          * terminating null. We need to convert
 685          * back to unix charset and count again
 686          * to get the number of bytes consumed from
 687          * the incoming path. */
 688
 689         errno = 0;
 690         if (pull_string_talloc(talloc_tos(),
 691                         NULL,
 692                         0,
 693                         &consumed_path,
 694                         path_ucs,
 695                         consumed_ucs,
 696                         STR_UNICODE) == 0) {
 697                 if (errno != 0) {
 698                         status = map_nt_error_from_unix(errno);
 699                 } else {
 700                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 701                 }
 702                 goto out;
 703         }
 704         if (consumed_path == NULL) {
 705                 status = map_nt_error_from_unix(errno);
 706                 goto out;
 707         }
 708         *consumed = strlen(consumed_path);
 709
 710         if (num_referrals != 0) {
 711                 uint16 ref_version;
 712                 uint16 ref_size;
 713                 int i;
 714                 uint16 node_offset;
 715
 716                 referrals = talloc_array(ctx, struct client_dfs_referral,
 717                                          num_referrals);
 718
 719                 if (!referrals) {
 720                         status = NT_STATUS_NO_MEMORY;
 721                         goto out;
 722                 }
 723                 /* start at the referrals array */
 724
 725                 p = (char *)rdata+8;
 726                 for (i=0; i<num_referrals && p < endp; i++) {
 727                         if (p + 18 > endp) {
 728                                 goto out;
 729                         }
 730                         ref_version = SVAL(p, 0);
 731                         ref_size    = SVAL(p, 2);
 732                         node_offset = SVAL(p, 16);
 733
 734                         if (ref_version != 3) {
 735                                 p += ref_size;
 736                                 continue;
 737                         }
 738
 739                         referrals[i].proximity = SVAL(p, 8);
 740                         referrals[i].ttl       = SVAL(p, 10);
 741
 742                         if (p + node_offset > endp) {
 743                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 744                                 goto out;
 745                         }
 746                         clistr_pull_talloc(referrals,
 747                                            (const char *)rdata,
 748                                            recv_flags2,
 749                                            &referrals[i].dfspath,
 750                                            p+node_offset,
 751                                            PTR_DIFF(endp, p+node_offset),
 752                                            STR_TERMINATE|STR_UNICODE);
 753
 754                         if (!referrals[i].dfspath) {
 755                                 status = map_nt_error_from_unix(errno);
 756                                 goto out;
 757                         }
 758                         p += ref_size;
 759                 }
 760                 if (i < num_referrals) {
 761                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 762                         goto out;
 763                 }
 764         }
 765
 766         *num_refs = num_referrals;
 767         *refs = referrals;
 768
 769   out:
 770
 771         TALLOC_FREE(frame);
 772         return status;
 773 }
 774
 775 /********************************************************************
 776 ********************************************************************/
 777
 778 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 779                           const char *mountpt,
 780                           const struct user_auth_info *dfs_auth_info,
 781                           struct cli_state *rootcli,
 782                           const char *path,
 783                           struct cli_state **targetcli,
 784                           char **pp_targetpath)
 785 {
 786         struct client_dfs_referral *refs = NULL;
 787         size_t num_refs = 0;
 788         size_t consumed = 0;
 789         struct cli_state *cli_ipc = NULL;
 790         char *dfs_path = NULL;
 791         char *cleanpath = NULL;
 792         char *extrapath = NULL;
 793         int pathlen;
 794         char *server = NULL;
 795         char *share = NULL;
 796         struct cli_state *newcli = NULL;
 797         char *newpath = NULL;
 798         char *newmount = NULL;
 799         char *ppath = NULL;
 800         SMB_STRUCT_STAT sbuf;
 801         uint32 attributes;
 802         NTSTATUS status;
 803
 804         if ( !rootcli || !path || !targetcli ) {
 805                 return NT_STATUS_INVALID_PARAMETER;
 806         }
 807
 808         /* Don't do anything if this is not a DFS root. */
 809
 810         if ( !rootcli->dfsroot) {
 811                 *targetcli = rootcli;
 812                 *pp_targetpath = talloc_strdup(ctx, path);
 813                 if (!*pp_targetpath) {
 814                         return NT_STATUS_NO_MEMORY;
 815                 }
 816                 return NT_STATUS_OK;
 817         }
 818
 819         *targetcli = NULL;
 820
 821         /* Send a trans2_query_path_info to check for a referral. */
 822
 823         cleanpath = clean_path(ctx, path);
 824         if (!cleanpath) {
 825                 return NT_STATUS_NO_MEMORY;
 826         }
 827
 828         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 829         if (!dfs_path) {
 830                 return NT_STATUS_NO_MEMORY;
 831         }
 832
 833         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 834         if (NT_STATUS_IS_OK(status)) {
 835                 /* This is an ordinary path, just return it. */
 836                 *targetcli = rootcli;
 837                 *pp_targetpath = talloc_strdup(ctx, path);
 838                 if (!*pp_targetpath) {
 839                         return NT_STATUS_NO_MEMORY;
 840                 }
 841                 goto done;
 842         }
 843
 844         /* Special case where client asked for a path that does not exist */
 845
 846         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 847                                 status)) {
 848                 *targetcli = rootcli;
 849                 *pp_targetpath = talloc_strdup(ctx, path);
 850                 if (!*pp_targetpath) {
 851                         return NT_STATUS_NO_MEMORY;
 852                 }
 853                 goto done;
 854         }
 855
 856         /* We got an error, check for DFS referral. */
 857
 858         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 859                                  status)) {
 860                 return status;
 861         }
 862
 863         /* Check for the referral. */
 864
 865         status = cli_cm_open(ctx,
 866                              rootcli,
 867                              smbXcli_conn_remote_name(rootcli->conn),
 868                              "IPC$",
 869                              dfs_auth_info,
 870                              false,
 871                              smb1cli_conn_encryption_on(rootcli->conn),
 872                              smbXcli_conn_protocol(rootcli->conn),
 873                              0,
 874                              0x20,
 875                              &cli_ipc);
 876         if (!NT_STATUS_IS_OK(status)) {
 877                 return status;
 878         }
 879
 880         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 881                                       &num_refs, &consumed);
 882         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 883                 return status;
 884         }
 885
 886         /* Just store the first referral for now. */
 887
 888         if (!refs[0].dfspath) {
 889                 return NT_STATUS_NOT_FOUND;
 890         }
 891         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 892                             &extrapath)) {
 893                 return NT_STATUS_NOT_FOUND;
 894         }
 895
 896         /* Make sure to recreate the original string including any wildcards. */
 897
 898         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 899         if (!dfs_path) {
 900                 return NT_STATUS_NO_MEMORY;
 901         }
 902         pathlen = strlen(dfs_path);
 903         consumed = MIN(pathlen, consumed);
 904         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 905         if (!*pp_targetpath) {
 906                 return NT_STATUS_NO_MEMORY;
 907         }
 908         dfs_path[consumed] = '\0';
 909
 910         /*
 911          * *pp_targetpath is now the unconsumed part of the path.
 912          * dfs_path is now the consumed part of the path
 913          * (in \server\share\path format).
 914          */
 915
 916         /* Open the connection to the target server & share */
 917         status = cli_cm_open(ctx, rootcli,
 918                              server,
 919                              share,
 920                              dfs_auth_info,
 921                              false,
 922                              smb1cli_conn_encryption_on(rootcli->conn),
 923                              smbXcli_conn_protocol(rootcli->conn),
 924                              0,
 925                              0x20,
 926                              targetcli);
 927         if (!NT_STATUS_IS_OK(status)) {
 928                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 929                         server, share );
 930                 return status;
 931         }
 932
 933         if (extrapath && strlen(extrapath) > 0) {
 934                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 935                 /* put the trailing \ on the path, so to be save we put one in if needed */
 936                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 937                         *pp_targetpath = talloc_asprintf(ctx,
 938                                                   "%s\\%s",
 939                                                   extrapath,
 940                                                   *pp_targetpath);
 941                 } else {
 942                         *pp_targetpath = talloc_asprintf(ctx,
 943                                                   "%s%s",
 944                                                   extrapath,
 945                                                   *pp_targetpath);
 946                 }
 947                 if (!*pp_targetpath) {
 948                         return NT_STATUS_NO_MEMORY;
 949                 }
 950         }
 951
 952         /* parse out the consumed mount path */
 953         /* trim off the \server\share\ */
 954
 955         ppath = dfs_path;
 956
 957         if (*ppath != '\\') {
 958                 d_printf("cli_resolve_path: "
 959                         "dfs_path (%s) not in correct format.\n",
 960                         dfs_path );
 961                 return NT_STATUS_NOT_FOUND;
 962         }
 963
 964         ppath++; /* Now pointing at start of server name. */
 965
 966         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 967                 return NT_STATUS_NOT_FOUND;
 968         }
 969
 970         ppath++; /* Now pointing at start of share name. */
 971
 972         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 973                 return NT_STATUS_NOT_FOUND;
 974         }
 975
 976         ppath++; /* Now pointing at path component. */
 977
 978         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 979         if (!newmount) {
 980                 return NT_STATUS_NOT_FOUND;
 981         }
 982
 983         cli_set_mntpoint(*targetcli, newmount);
 984
 985         /* Check for another dfs referral, note that we are not
 986            checking for loops here. */
 987
 988         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 989                 status = cli_resolve_path(ctx,
 990                                           newmount,
 991                                           dfs_auth_info,
 992                                           *targetcli,
 993                                           *pp_targetpath,
 994                                           &newcli,
 995                                           &newpath);
 996                 if (NT_STATUS_IS_OK(status)) {
 997                         /*
 998                          * When cli_resolve_path returns true here it's always
 999                          * returning the complete path in newpath, so we're done
1000                          * here.
1001                          */
1002                         *targetcli = newcli;
1003                         *pp_targetpath = newpath;
1004                         return status;
1005                 }
1006         }
1007
1008   done:
1009
1010         /* If returning true ensure we return a dfs root full path. */
1011         if ((*targetcli)->dfsroot) {
1012                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1013                 if (!dfs_path) {
1014                         return NT_STATUS_NO_MEMORY;
1015                 }
1016                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1017                 if (*pp_targetpath == NULL) {
1018                         return NT_STATUS_NO_MEMORY;
1019                 }
1020         }
1021
1022         return NT_STATUS_OK;
1023 }
1024
1025 /********************************************************************
1026 ********************************************************************/
1027
1028 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1029                                 struct cli_state *cli,
1030                                 const char *sharename,
1031                                 char **pp_newserver,
1032                                 char **pp_newshare,
1033                                 bool force_encrypt,
1034                                 const char *username,
1035                                 const char *password,
1036                                 const char *domain)
1037 {
1038         struct client_dfs_referral *refs = NULL;
1039         size_t num_refs = 0;
1040         size_t consumed = 0;
1041         char *fullpath = NULL;
1042         bool res;
1043         uint16 cnum;
1044         char *newextrapath = NULL;
1045         NTSTATUS status;
1046         const char *remote_name;
1047
1048         if (!cli || !sharename) {
1049                 return false;
1050         }
1051
1052         remote_name = smbXcli_conn_remote_name(cli->conn);
1053         cnum = cli_state_get_tid(cli);
1054
1055         /* special case.  never check for a referral on the IPC$ share */
1056
1057         if (strequal(sharename, "IPC$")) {
1058                 return false;
1059         }
1060
1061         /* send a trans2_query_path_info to check for a referral */
1062
1063         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1064         if (!fullpath) {
1065                 return false;
1066         }
1067
1068         /* check for the referral */
1069
1070         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL, 0))) {
1071                 return false;
1072         }
1073
1074         if (force_encrypt) {
1075                 status = cli_cm_force_encryption(cli,
1076                                         username,
1077                                         password,
1078                                         lp_workgroup(),
1079                                         "IPC$");
1080                 if (!NT_STATUS_IS_OK(status)) {
1081                         return false;
1082                 }
1083         }
1084
1085         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1086                                       &num_refs, &consumed);
1087         res = NT_STATUS_IS_OK(status);
1088
1089         status = cli_tdis(cli);
1090         if (!NT_STATUS_IS_OK(status)) {
1091                 return false;
1092         }
1093
1094         cli_state_set_tid(cli, cnum);
1095
1096         if (!res || !num_refs) {
1097                 return false;
1098         }
1099
1100         if (!refs[0].dfspath) {
1101                 return false;
1102         }
1103
1104         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1105                             pp_newshare, &newextrapath)) {
1106                 return false;
1107         }
1108
1109         /* check that this is not a self-referral */
1110
1111         if (strequal(remote_name, *pp_newserver) &&
1112                         strequal(sharename, *pp_newshare)) {
1113                 return false;
1114         }
1115
1116         return true;
1117 }