source3/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6    Copyright (C) Jeremy Allison                   2007-2009
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libsmb/libsmb.h"
  24 #include "libsmb/clirap.h"
  25 #include "msdfs.h"
  26 #include "trans2.h"
  27 #include "libsmb/nmblib.h"
  28 #include "../libcli/smb/smbXcli_base.h"
  29
  30 /********************************************************************
  31  Important point.
  32
  33  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  34  are not C escaped here).
  35
  36  - but if we're using POSIX paths then <pathname> may contain
  37    '/' separators, not '\\' separators. So cope with '\\' or '/'
  38    as a separator when looking at the pathname part.... JRA.
  39 ********************************************************************/
  40
  41 /********************************************************************
  42  Ensure a connection is encrypted.
  43 ********************************************************************/
  44
  45 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  46                         const char *username,
  47                         const char *password,
  48                         const char *domain,
  49                         const char *sharename)
  50 {
  51         NTSTATUS status;
  52
  53         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
  54                 status = smb2cli_session_encryption_on(c->smb2.session);
  55                 if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  56                         d_printf("Encryption required and "
  57                                 "server doesn't support "
  58                                 "SMB3 encryption - failing connect\n");
  59                 } else if (!NT_STATUS_IS_OK(status)) {
  60                         d_printf("Encryption required and "
  61                                 "setup failed with error %s.\n",
  62                                 nt_errstr(status));
  63                 }
  64                 return status;
  65         }
  66
  67         status = cli_force_encryption(c,
  68                                         username,
  69                                         password,
  70                                         domain);
  71
  72         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  73                 d_printf("Encryption required and "
  74                         "server that doesn't support "
  75                         "UNIX extensions - failing connect\n");
  76         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  77                 d_printf("Encryption required and "
  78                         "can't get UNIX CIFS extensions "
  79                         "version from server.\n");
  80         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  81                 d_printf("Encryption required and "
  82                         "share %s doesn't support "
  83                         "encryption.\n", sharename);
  84         } else if (!NT_STATUS_IS_OK(status)) {
  85                 d_printf("Encryption required and "
  86                         "setup failed with error %s.\n",
  87                         nt_errstr(status));
  88         }
  89
  90         return status;
  91 }
  92
  93 /********************************************************************
  94  Return a connection to a server.
  95 ********************************************************************/
  96
  97 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  98                                         const char *server,
  99                                         const char *share,
 100                                         const struct user_auth_info *auth_info,
 101                                         bool show_sessetup,
 102                                         bool force_encrypt,
 103                                         int max_protocol,
 104                                         int port,
 105                                         int name_type,
 106                                         struct cli_state **pcli)
 107 {
 108         struct cli_state *c = NULL;
 109         char *servicename;
 110         char *sharename;
 111         char *newserver, *newshare;
 112         const char *username;
 113         const char *password;
 114         NTSTATUS status;
 115         int flags = 0;
 116
 117         /* make a copy so we don't modify the global string 'service' */
 118         servicename = talloc_strdup(ctx,share);
 119         if (!servicename) {
 120                 return NT_STATUS_NO_MEMORY;
 121         }
 122         sharename = servicename;
 123         if (*sharename == '\\') {
 124                 sharename += 2;
 125                 if (server == NULL) {
 126                         server = sharename;
 127                 }
 128                 sharename = strchr_m(sharename,'\\');
 129                 if (!sharename) {
 130                         return NT_STATUS_NO_MEMORY;
 131                 }
 132                 *sharename = 0;
 133                 sharename++;
 134         }
 135         if (server == NULL) {
 136                 return NT_STATUS_INVALID_PARAMETER;
 137         }
 138
 139         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 140                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 141         }
 142         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 143                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 144         }
 145         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 146                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 147         }
 148         if (get_cmdline_auth_info_use_pw_nt_hash(auth_info)) {
 149                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 150         }
 151
 152         status = cli_connect_nb(
 153                 server, NULL, port, name_type, NULL,
 154                 get_cmdline_auth_info_signing_state(auth_info),
 155                 flags, &c);
 156
 157         if (!NT_STATUS_IS_OK(status)) {
 158                 d_printf("Connection to %s failed (Error %s)\n",
 159                                 server,
 160                                 nt_errstr(status));
 161                 return status;
 162         }
 163
 164         if (max_protocol == 0) {
 165                 max_protocol = PROTOCOL_NT1;
 166         }
 167         DEBUG(4,(" session request ok\n"));
 168
 169         status = smbXcli_negprot(c->conn, c->timeout,
 170                                  lp_cli_minprotocol(),
 171                                  max_protocol);
 172
 173         if (!NT_STATUS_IS_OK(status)) {
 174                 d_printf("protocol negotiation failed: %s\n",
 175                          nt_errstr(status));
 176                 cli_shutdown(c);
 177                 return status;
 178         }
 179
 180         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 181                 /* Ensure we ask for some initial credits. */
 182                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 183         }
 184
 185         username = get_cmdline_auth_info_username(auth_info);
 186         password = get_cmdline_auth_info_password(auth_info);
 187
 188         status = cli_session_setup(c, username,
 189                                    password, strlen(password),
 190                                    password, strlen(password),
 191                                    lp_workgroup());
 192         if (!NT_STATUS_IS_OK(status)) {
 193                 /* If a password was not supplied then
 194                  * try again with a null username. */
 195                 if (password[0] || !username[0] ||
 196                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 197                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 198                                                 "", 0,
 199                                                 "", 0,
 200                                                lp_workgroup()))) {
 201                         d_printf("session setup failed: %s\n",
 202                                  nt_errstr(status));
 203                         if (NT_STATUS_EQUAL(status,
 204                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 205                                 d_printf("did you forget to run kinit?\n");
 206                         cli_shutdown(c);
 207                         return status;
 208                 }
 209                 d_printf("Anonymous login successful\n");
 210                 status = cli_init_creds(c, "", lp_workgroup(), "");
 211         } else {
 212                 status = cli_init_creds(c, username, lp_workgroup(), password);
 213         }
 214
 215         if (!NT_STATUS_IS_OK(status)) {
 216                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 217                 cli_shutdown(c);
 218                 return status;
 219         }
 220
 221         if ( show_sessetup ) {
 222                 if (*c->server_domain) {
 223                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 224                                 c->server_domain,c->server_os,c->server_type));
 225                 } else if (*c->server_os || *c->server_type) {
 226                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 227                                  c->server_os,c->server_type));
 228                 }
 229         }
 230         DEBUG(4,(" session setup ok\n"));
 231
 232         /* here's the fun part....to support 'msdfs proxy' shares
 233            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 234            here before trying to connect to the original share.
 235            cli_check_msdfs_proxy() will fail if it is a normal share. */
 236
 237         if (smbXcli_conn_dfs_supported(c->conn) &&
 238                         cli_check_msdfs_proxy(ctx, c, sharename,
 239                                 &newserver, &newshare,
 240                                 force_encrypt,
 241                                 username,
 242                                 password,
 243                                 lp_workgroup())) {
 244                 cli_shutdown(c);
 245                 return do_connect(ctx, newserver,
 246                                 newshare, auth_info, false,
 247                                 force_encrypt, max_protocol,
 248                                 port, name_type, pcli);
 249         }
 250
 251         /* must be a normal share */
 252
 253         status = cli_tree_connect(c, sharename, "?????",
 254                                   password, strlen(password)+1);
 255         if (!NT_STATUS_IS_OK(status)) {
 256                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 257                 cli_shutdown(c);
 258                 return status;
 259         }
 260
 261         if (force_encrypt) {
 262                 status = cli_cm_force_encryption(c,
 263                                         username,
 264                                         password,
 265                                         lp_workgroup(),
 266                                         sharename);
 267                 if (!NT_STATUS_IS_OK(status)) {
 268                         cli_shutdown(c);
 269                         return status;
 270                 }
 271         }
 272
 273         DEBUG(4,(" tconx ok\n"));
 274         *pcli = c;
 275         return NT_STATUS_OK;
 276 }
 277
 278 /****************************************************************************
 279 ****************************************************************************/
 280
 281 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 282 {
 283         char *name = clean_name(NULL, mnt);
 284         if (!name) {
 285                 return;
 286         }
 287         TALLOC_FREE(cli->dfs_mountpoint);
 288         cli->dfs_mountpoint = talloc_strdup(cli, name);
 289         TALLOC_FREE(name);
 290 }
 291
 292 /********************************************************************
 293  Add a new connection to the list.
 294  referring_cli == NULL means a new initial connection.
 295 ********************************************************************/
 296
 297 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 298                                struct cli_state *referring_cli,
 299                                const char *server,
 300                                const char *share,
 301                                const struct user_auth_info *auth_info,
 302                                bool show_hdr,
 303                                bool force_encrypt,
 304                                int max_protocol,
 305                                int port,
 306                                int name_type,
 307                                struct cli_state **pcli)
 308 {
 309         struct cli_state *cli;
 310         NTSTATUS status;
 311
 312         status = do_connect(ctx, server, share,
 313                                 auth_info,
 314                                 show_hdr, force_encrypt, max_protocol,
 315                                 port, name_type, &cli);
 316
 317         if (!NT_STATUS_IS_OK(status)) {
 318                 return status;
 319         }
 320
 321         /* Enter into the list. */
 322         if (referring_cli) {
 323                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 324         }
 325
 326         if (referring_cli && referring_cli->requested_posix_capabilities) {
 327                 uint16 major, minor;
 328                 uint32 caplow, caphigh;
 329                 status = cli_unix_extensions_version(cli, &major, &minor,
 330                                                      &caplow, &caphigh);
 331                 if (NT_STATUS_IS_OK(status)) {
 332                         cli_set_unix_extensions_capabilities(cli,
 333                                         major, minor,
 334                                         caplow, caphigh);
 335                 }
 336         }
 337
 338         *pcli = cli;
 339         return NT_STATUS_OK;
 340 }
 341
 342 /********************************************************************
 343  Return a connection to a server on a particular share.
 344 ********************************************************************/
 345
 346 static struct cli_state *cli_cm_find(struct cli_state *cli,
 347                                 const char *server,
 348                                 const char *share)
 349 {
 350         struct cli_state *p;
 351
 352         if (cli == NULL) {
 353                 return NULL;
 354         }
 355
 356         /* Search to the start of the list. */
 357         for (p = cli; p; p = DLIST_PREV(p)) {
 358                 const char *remote_name =
 359                         smbXcli_conn_remote_name(p->conn);
 360
 361                 if (strequal(server, remote_name) &&
 362                                 strequal(share,p->share)) {
 363                         return p;
 364                 }
 365         }
 366
 367         /* Search to the end of the list. */
 368         for (p = cli->next; p; p = p->next) {
 369                 const char *remote_name =
 370                         smbXcli_conn_remote_name(p->conn);
 371
 372                 if (strequal(server, remote_name) &&
 373                                 strequal(share,p->share)) {
 374                         return p;
 375                 }
 376         }
 377
 378         return NULL;
 379 }
 380
 381 /****************************************************************************
 382  Open a client connection to a \\server\share.
 383 ****************************************************************************/
 384
 385 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 386                                 struct cli_state *referring_cli,
 387                                 const char *server,
 388                                 const char *share,
 389                                 const struct user_auth_info *auth_info,
 390                                 bool show_hdr,
 391                                 bool force_encrypt,
 392                                 int max_protocol,
 393                                 int port,
 394                                 int name_type,
 395                                 struct cli_state **pcli)
 396 {
 397         /* Try to reuse an existing connection in this list. */
 398         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 399         NTSTATUS status;
 400
 401         if (c) {
 402                 *pcli = c;
 403                 return NT_STATUS_OK;
 404         }
 405
 406         if (auth_info == NULL) {
 407                 /* Can't do a new connection
 408                  * without auth info. */
 409                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 410                         "without auth info\n",
 411                         server, share );
 412                 return NT_STATUS_INVALID_PARAMETER;
 413         }
 414
 415         status = cli_cm_connect(ctx,
 416                                 referring_cli,
 417                                 server,
 418                                 share,
 419                                 auth_info,
 420                                 show_hdr,
 421                                 force_encrypt,
 422                                 max_protocol,
 423                                 port,
 424                                 name_type,
 425                                 &c);
 426         if (!NT_STATUS_IS_OK(status)) {
 427                 return status;
 428         }
 429         *pcli = c;
 430         return NT_STATUS_OK;
 431 }
 432
 433 /****************************************************************************
 434 ****************************************************************************/
 435
 436 void cli_cm_display(struct cli_state *cli)
 437 {
 438         int i;
 439
 440         for (i=0; cli; cli = cli->next,i++ ) {
 441                 d_printf("%d:\tserver=%s, share=%s\n",
 442                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 443         }
 444 }
 445
 446 /****************************************************************************
 447 ****************************************************************************/
 448
 449 /****************************************************************************
 450 ****************************************************************************/
 451
 452 #if 0
 453 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 454 {
 455         SAFE_FREE(cm_creds.username);
 456         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 457                                                auth_info));
 458
 459         if (get_cmdline_auth_info_got_pass(auth_info)) {
 460                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 461         }
 462
 463         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 464         cm_creds.fallback_after_kerberos = false;
 465         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 466 }
 467 #endif
 468
 469 /**********************************************************************
 470  split a dfs path into the server, share name, and extrapath components
 471 **********************************************************************/
 472
 473 static bool split_dfs_path(TALLOC_CTX *ctx,
 474                                 const char *nodepath,
 475                                 char **pp_server,
 476                                 char **pp_share,
 477                                 char **pp_extrapath)
 478 {
 479         char *p, *q;
 480         char *path;
 481
 482         *pp_server = NULL;
 483         *pp_share = NULL;
 484         *pp_extrapath = NULL;
 485
 486         path = talloc_strdup(ctx, nodepath);
 487         if (!path) {
 488                 goto fail;
 489         }
 490
 491         if ( path[0] != '\\' ) {
 492                 goto fail;
 493         }
 494
 495         p = strchr_m( path + 1, '\\' );
 496         if ( !p ) {
 497                 goto fail;
 498         }
 499
 500         *p = '\0';
 501         p++;
 502
 503         /* Look for any extra/deep path */
 504         q = strchr_m(p, '\\');
 505         if (q != NULL) {
 506                 *q = '\0';
 507                 q++;
 508                 *pp_extrapath = talloc_strdup(ctx, q);
 509         } else {
 510                 *pp_extrapath = talloc_strdup(ctx, "");
 511         }
 512         if (*pp_extrapath == NULL) {
 513                 goto fail;
 514         }
 515
 516         *pp_share = talloc_strdup(ctx, p);
 517         if (*pp_share == NULL) {
 518                 goto fail;
 519         }
 520
 521         *pp_server = talloc_strdup(ctx, &path[1]);
 522         if (*pp_server == NULL) {
 523                 goto fail;
 524         }
 525
 526         TALLOC_FREE(path);
 527         return true;
 528
 529 fail:
 530         TALLOC_FREE(*pp_share);
 531         TALLOC_FREE(*pp_extrapath);
 532         TALLOC_FREE(path);
 533         return false;
 534 }
 535
 536 /****************************************************************************
 537  Return the original path truncated at the directory component before
 538  the first wildcard character. Trust the caller to provide a NULL
 539  terminated string
 540 ****************************************************************************/
 541
 542 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 543 {
 544         size_t len;
 545         char *p1, *p2, *p;
 546         char *path_out;
 547
 548         /* No absolute paths. */
 549         while (IS_DIRECTORY_SEP(*path)) {
 550                 path++;
 551         }
 552
 553         path_out = talloc_strdup(ctx, path);
 554         if (!path_out) {
 555                 return NULL;
 556         }
 557
 558         p1 = strchr_m(path_out, '*');
 559         p2 = strchr_m(path_out, '?');
 560
 561         if (p1 || p2) {
 562                 if (p1 && p2) {
 563                         p = MIN(p1,p2);
 564                 } else if (!p1) {
 565                         p = p2;
 566                 } else {
 567                         p = p1;
 568                 }
 569                 *p = '\0';
 570
 571                 /* Now go back to the start of this component. */
 572                 p1 = strrchr_m(path_out, '/');
 573                 p2 = strrchr_m(path_out, '\\');
 574                 p = MAX(p1,p2);
 575                 if (p) {
 576                         *p = '\0';
 577                 }
 578         }
 579
 580         /* Strip any trailing separator */
 581
 582         len = strlen(path_out);
 583         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 584                 path_out[len-1] = '\0';
 585         }
 586
 587         return path_out;
 588 }
 589
 590 /****************************************************************************
 591 ****************************************************************************/
 592
 593 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 594                                         struct cli_state *cli,
 595                                         const char *dir)
 596 {
 597         char path_sep = '\\';
 598
 599         /* Ensure the extrapath doesn't start with a separator. */
 600         while (IS_DIRECTORY_SEP(*dir)) {
 601                 dir++;
 602         }
 603
 604         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 605                 path_sep = '/';
 606         }
 607         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 608                         path_sep,
 609                         smbXcli_conn_remote_name(cli->conn),
 610                         path_sep,
 611                         cli->share,
 612                         path_sep,
 613                         dir);
 614 }
 615
 616 /********************************************************************
 617  check for dfs referral
 618 ********************************************************************/
 619
 620 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 621                                 NTSTATUS status)
 622 {
 623         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 624
 625         if (!(smbXcli_conn_use_unicode(cli->conn))) {
 626                 return false;
 627         }
 628         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 629                 return false;
 630         }
 631         if (NT_STATUS_EQUAL(status, expected)) {
 632                 return true;
 633         }
 634         return false;
 635 }
 636
 637 /********************************************************************
 638  Get the dfs referral link.
 639 ********************************************************************/
 640
 641 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 642                         struct cli_state *cli,
 643                         const char *path,
 644                         struct client_dfs_referral **refs,
 645                         size_t *num_refs,
 646                         size_t *consumed)
 647 {
 648         unsigned int data_len = 0;
 649         unsigned int param_len = 0;
 650         uint16_t setup[1];
 651         uint16_t recv_flags2;
 652         uint8_t *param = NULL;
 653         uint8_t *rdata = NULL;
 654         char *p;
 655         char *endp;
 656         smb_ucs2_t *path_ucs;
 657         char *consumed_path = NULL;
 658         uint16_t consumed_ucs;
 659         uint16 num_referrals;
 660         struct client_dfs_referral *referrals = NULL;
 661         NTSTATUS status;
 662         TALLOC_CTX *frame = talloc_stackframe();
 663
 664         *num_refs = 0;
 665         *refs = NULL;
 666
 667         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 668
 669         param = talloc_array(talloc_tos(), uint8_t, 2);
 670         if (!param) {
 671                 status = NT_STATUS_NO_MEMORY;
 672                 goto out;
 673         }
 674         SSVAL(param, 0, 0x03);  /* max referral level */
 675
 676         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 677                                       path, strlen(path)+1,
 678                                       NULL);
 679         if (!param) {
 680                 status = NT_STATUS_NO_MEMORY;
 681                 goto out;
 682         }
 683         param_len = talloc_get_size(param);
 684         path_ucs = (smb_ucs2_t *)&param[2];
 685
 686         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 687                            NULL, 0xffff, 0, 0,
 688                            setup, 1, 0,
 689                            param, param_len, 2,
 690                            NULL, 0, CLI_BUFFER_SIZE,
 691                            &recv_flags2,
 692                            NULL, 0, NULL, /* rsetup */
 693                            NULL, 0, NULL,
 694                            &rdata, 4, &data_len);
 695         if (!NT_STATUS_IS_OK(status)) {
 696                 goto out;
 697         }
 698
 699         endp = (char *)rdata + data_len;
 700
 701         consumed_ucs  = SVAL(rdata, 0);
 702         num_referrals = SVAL(rdata, 2);
 703
 704         /* consumed_ucs is the number of bytes
 705          * of the UCS2 path consumed not counting any
 706          * terminating null. We need to convert
 707          * back to unix charset and count again
 708          * to get the number of bytes consumed from
 709          * the incoming path. */
 710
 711         errno = 0;
 712         if (pull_string_talloc(talloc_tos(),
 713                         NULL,
 714                         0,
 715                         &consumed_path,
 716                         path_ucs,
 717                         consumed_ucs,
 718                         STR_UNICODE) == 0) {
 719                 if (errno != 0) {
 720                         status = map_nt_error_from_unix(errno);
 721                 } else {
 722                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 723                 }
 724                 goto out;
 725         }
 726         if (consumed_path == NULL) {
 727                 status = map_nt_error_from_unix(errno);
 728                 goto out;
 729         }
 730         *consumed = strlen(consumed_path);
 731
 732         if (num_referrals != 0) {
 733                 uint16 ref_version;
 734                 uint16 ref_size;
 735                 int i;
 736                 uint16 node_offset;
 737
 738                 referrals = talloc_array(ctx, struct client_dfs_referral,
 739                                          num_referrals);
 740
 741                 if (!referrals) {
 742                         status = NT_STATUS_NO_MEMORY;
 743                         goto out;
 744                 }
 745                 /* start at the referrals array */
 746
 747                 p = (char *)rdata+8;
 748                 for (i=0; i<num_referrals && p < endp; i++) {
 749                         if (p + 18 > endp) {
 750                                 goto out;
 751                         }
 752                         ref_version = SVAL(p, 0);
 753                         ref_size    = SVAL(p, 2);
 754                         node_offset = SVAL(p, 16);
 755
 756                         if (ref_version != 3) {
 757                                 p += ref_size;
 758                                 continue;
 759                         }
 760
 761                         referrals[i].proximity = SVAL(p, 8);
 762                         referrals[i].ttl       = SVAL(p, 10);
 763
 764                         if (p + node_offset > endp) {
 765                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 766                                 goto out;
 767                         }
 768                         clistr_pull_talloc(referrals,
 769                                            (const char *)rdata,
 770                                            recv_flags2,
 771                                            &referrals[i].dfspath,
 772                                            p+node_offset,
 773                                            PTR_DIFF(endp, p+node_offset),
 774                                            STR_TERMINATE|STR_UNICODE);
 775
 776                         if (!referrals[i].dfspath) {
 777                                 status = map_nt_error_from_unix(errno);
 778                                 goto out;
 779                         }
 780                         p += ref_size;
 781                 }
 782                 if (i < num_referrals) {
 783                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 784                         goto out;
 785                 }
 786         }
 787
 788         *num_refs = num_referrals;
 789         *refs = referrals;
 790
 791   out:
 792
 793         TALLOC_FREE(frame);
 794         return status;
 795 }
 796
 797 /********************************************************************
 798 ********************************************************************/
 799
 800 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 801                           const char *mountpt,
 802                           const struct user_auth_info *dfs_auth_info,
 803                           struct cli_state *rootcli,
 804                           const char *path,
 805                           struct cli_state **targetcli,
 806                           char **pp_targetpath)
 807 {
 808         struct client_dfs_referral *refs = NULL;
 809         size_t num_refs = 0;
 810         size_t consumed = 0;
 811         struct cli_state *cli_ipc = NULL;
 812         char *dfs_path = NULL;
 813         char *cleanpath = NULL;
 814         char *extrapath = NULL;
 815         int pathlen;
 816         char *server = NULL;
 817         char *share = NULL;
 818         struct cli_state *newcli = NULL;
 819         char *newpath = NULL;
 820         char *newmount = NULL;
 821         char *ppath = NULL;
 822         SMB_STRUCT_STAT sbuf;
 823         uint32 attributes;
 824         NTSTATUS status;
 825         struct smbXcli_tcon *root_tcon = NULL;
 826         struct smbXcli_tcon *target_tcon = NULL;
 827
 828         if ( !rootcli || !path || !targetcli ) {
 829                 return NT_STATUS_INVALID_PARAMETER;
 830         }
 831
 832         /* Don't do anything if this is not a DFS root. */
 833
 834         if (smbXcli_conn_protocol(rootcli->conn) >= PROTOCOL_SMB2_02) {
 835                 root_tcon = rootcli->smb2.tcon;
 836         } else {
 837                 root_tcon = rootcli->smb1.tcon;
 838         }
 839
 840         if (!smbXcli_tcon_is_dfs_share(root_tcon)) {
 841                 *targetcli = rootcli;
 842                 *pp_targetpath = talloc_strdup(ctx, path);
 843                 if (!*pp_targetpath) {
 844                         return NT_STATUS_NO_MEMORY;
 845                 }
 846                 return NT_STATUS_OK;
 847         }
 848
 849         *targetcli = NULL;
 850
 851         /* Send a trans2_query_path_info to check for a referral. */
 852
 853         cleanpath = clean_path(ctx, path);
 854         if (!cleanpath) {
 855                 return NT_STATUS_NO_MEMORY;
 856         }
 857
 858         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 859         if (!dfs_path) {
 860                 return NT_STATUS_NO_MEMORY;
 861         }
 862
 863         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 864         if (NT_STATUS_IS_OK(status)) {
 865                 /* This is an ordinary path, just return it. */
 866                 *targetcli = rootcli;
 867                 *pp_targetpath = talloc_strdup(ctx, path);
 868                 if (!*pp_targetpath) {
 869                         return NT_STATUS_NO_MEMORY;
 870                 }
 871                 goto done;
 872         }
 873
 874         /* Special case where client asked for a path that does not exist */
 875
 876         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 877                                 status)) {
 878                 *targetcli = rootcli;
 879                 *pp_targetpath = talloc_strdup(ctx, path);
 880                 if (!*pp_targetpath) {
 881                         return NT_STATUS_NO_MEMORY;
 882                 }
 883                 goto done;
 884         }
 885
 886         /* We got an error, check for DFS referral. */
 887
 888         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 889                                  status)) {
 890                 return status;
 891         }
 892
 893         /* Check for the referral. */
 894
 895         status = cli_cm_open(ctx,
 896                              rootcli,
 897                              smbXcli_conn_remote_name(rootcli->conn),
 898                              "IPC$",
 899                              dfs_auth_info,
 900                              false,
 901                              smb1cli_conn_encryption_on(rootcli->conn),
 902                              smbXcli_conn_protocol(rootcli->conn),
 903                              0,
 904                              0x20,
 905                              &cli_ipc);
 906         if (!NT_STATUS_IS_OK(status)) {
 907                 return status;
 908         }
 909
 910         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 911                                       &num_refs, &consumed);
 912         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 913                 return status;
 914         }
 915
 916         /* Just store the first referral for now. */
 917
 918         if (!refs[0].dfspath) {
 919                 return NT_STATUS_NOT_FOUND;
 920         }
 921         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 922                             &extrapath)) {
 923                 return NT_STATUS_NOT_FOUND;
 924         }
 925
 926         /* Make sure to recreate the original string including any wildcards. */
 927
 928         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 929         if (!dfs_path) {
 930                 return NT_STATUS_NO_MEMORY;
 931         }
 932         pathlen = strlen(dfs_path);
 933         consumed = MIN(pathlen, consumed);
 934         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 935         if (!*pp_targetpath) {
 936                 return NT_STATUS_NO_MEMORY;
 937         }
 938         dfs_path[consumed] = '\0';
 939
 940         /*
 941          * *pp_targetpath is now the unconsumed part of the path.
 942          * dfs_path is now the consumed part of the path
 943          * (in \server\share\path format).
 944          */
 945
 946         /* Open the connection to the target server & share */
 947         status = cli_cm_open(ctx, rootcli,
 948                              server,
 949                              share,
 950                              dfs_auth_info,
 951                              false,
 952                              smb1cli_conn_encryption_on(rootcli->conn),
 953                              smbXcli_conn_protocol(rootcli->conn),
 954                              0,
 955                              0x20,
 956                              targetcli);
 957         if (!NT_STATUS_IS_OK(status)) {
 958                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 959                         server, share );
 960                 return status;
 961         }
 962
 963         if (extrapath && strlen(extrapath) > 0) {
 964                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 965                 /* put the trailing \ on the path, so to be save we put one in if needed */
 966                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 967                         *pp_targetpath = talloc_asprintf(ctx,
 968                                                   "%s\\%s",
 969                                                   extrapath,
 970                                                   *pp_targetpath);
 971                 } else {
 972                         *pp_targetpath = talloc_asprintf(ctx,
 973                                                   "%s%s",
 974                                                   extrapath,
 975                                                   *pp_targetpath);
 976                 }
 977                 if (!*pp_targetpath) {
 978                         return NT_STATUS_NO_MEMORY;
 979                 }
 980         }
 981
 982         /* parse out the consumed mount path */
 983         /* trim off the \server\share\ */
 984
 985         ppath = dfs_path;
 986
 987         if (*ppath != '\\') {
 988                 d_printf("cli_resolve_path: "
 989                         "dfs_path (%s) not in correct format.\n",
 990                         dfs_path );
 991                 return NT_STATUS_NOT_FOUND;
 992         }
 993
 994         ppath++; /* Now pointing at start of server name. */
 995
 996         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 997                 return NT_STATUS_NOT_FOUND;
 998         }
 999
1000         ppath++; /* Now pointing at start of share name. */
1001
1002         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1003                 return NT_STATUS_NOT_FOUND;
1004         }
1005
1006         ppath++; /* Now pointing at path component. */
1007
1008         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1009         if (!newmount) {
1010                 return NT_STATUS_NOT_FOUND;
1011         }
1012
1013         cli_set_mntpoint(*targetcli, newmount);
1014
1015         /* Check for another dfs referral, note that we are not
1016            checking for loops here. */
1017
1018         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1019                 status = cli_resolve_path(ctx,
1020                                           newmount,
1021                                           dfs_auth_info,
1022                                           *targetcli,
1023                                           *pp_targetpath,
1024                                           &newcli,
1025                                           &newpath);
1026                 if (NT_STATUS_IS_OK(status)) {
1027                         /*
1028                          * When cli_resolve_path returns true here it's always
1029                          * returning the complete path in newpath, so we're done
1030                          * here.
1031                          */
1032                         *targetcli = newcli;
1033                         *pp_targetpath = newpath;
1034                         return status;
1035                 }
1036         }
1037
1038   done:
1039
1040         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1041                 target_tcon = (*targetcli)->smb2.tcon;
1042         } else {
1043                 target_tcon = (*targetcli)->smb1.tcon;
1044         }
1045
1046         /* If returning true ensure we return a dfs root full path. */
1047         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1048                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1049                 if (!dfs_path) {
1050                         return NT_STATUS_NO_MEMORY;
1051                 }
1052                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1053                 if (*pp_targetpath == NULL) {
1054                         return NT_STATUS_NO_MEMORY;
1055                 }
1056         }
1057
1058         return NT_STATUS_OK;
1059 }
1060
1061 /********************************************************************
1062 ********************************************************************/
1063
1064 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1065                                 struct cli_state *cli,
1066                                 const char *sharename,
1067                                 char **pp_newserver,
1068                                 char **pp_newshare,
1069                                 bool force_encrypt,
1070                                 const char *username,
1071                                 const char *password,
1072                                 const char *domain)
1073 {
1074         struct client_dfs_referral *refs = NULL;
1075         size_t num_refs = 0;
1076         size_t consumed = 0;
1077         char *fullpath = NULL;
1078         bool res;
1079         uint16 cnum;
1080         char *newextrapath = NULL;
1081         NTSTATUS status;
1082         const char *remote_name;
1083
1084         if (!cli || !sharename) {
1085                 return false;
1086         }
1087
1088         remote_name = smbXcli_conn_remote_name(cli->conn);
1089         cnum = cli_state_get_tid(cli);
1090
1091         /* special case.  never check for a referral on the IPC$ share */
1092
1093         if (strequal(sharename, "IPC$")) {
1094                 return false;
1095         }
1096
1097         /* send a trans2_query_path_info to check for a referral */
1098
1099         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1100         if (!fullpath) {
1101                 return false;
1102         }
1103
1104         /* check for the referral */
1105
1106         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL, 0))) {
1107                 return false;
1108         }
1109
1110         if (force_encrypt) {
1111                 status = cli_cm_force_encryption(cli,
1112                                         username,
1113                                         password,
1114                                         lp_workgroup(),
1115                                         "IPC$");
1116                 if (!NT_STATUS_IS_OK(status)) {
1117                         return false;
1118                 }
1119         }
1120
1121         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1122                                       &num_refs, &consumed);
1123         res = NT_STATUS_IS_OK(status);
1124
1125         status = cli_tdis(cli);
1126         if (!NT_STATUS_IS_OK(status)) {
1127                 return false;
1128         }
1129
1130         cli_state_set_tid(cli, cnum);
1131
1132         if (!res || !num_refs) {
1133                 return false;
1134         }
1135
1136         if (!refs[0].dfspath) {
1137                 return false;
1138         }
1139
1140         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1141                             pp_newshare, &newextrapath)) {
1142                 return false;
1143         }
1144
1145         /* check that this is not a self-referral */
1146
1147         if (strequal(remote_name, *pp_newserver) &&
1148                         strequal(sharename, *pp_newshare)) {
1149                 return false;
1150         }
1151
1152         return true;
1153 }