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         status = cli_tree_connect(c, sharename, "?????",
 240                                   password, strlen(password)+1);
 241         if (!NT_STATUS_IS_OK(status)) {
 242                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 243                 cli_shutdown(c);
 244                 return status;
 245         }
 246
 247         if (force_encrypt) {
 248                 status = cli_cm_force_encryption(c,
 249                                         username,
 250                                         password,
 251                                         lp_workgroup(),
 252                                         sharename);
 253                 if (!NT_STATUS_IS_OK(status)) {
 254                         cli_shutdown(c);
 255                         return status;
 256                 }
 257         }
 258
 259         DEBUG(4,(" tconx ok\n"));
 260         *pcli = c;
 261         return NT_STATUS_OK;
 262 }
 263
 264 /****************************************************************************
 265 ****************************************************************************/
 266
 267 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 268 {
 269         char *name = clean_name(NULL, mnt);
 270         if (!name) {
 271                 return;
 272         }
 273         TALLOC_FREE(cli->dfs_mountpoint);
 274         cli->dfs_mountpoint = talloc_strdup(cli, name);
 275         TALLOC_FREE(name);
 276 }
 277
 278 /********************************************************************
 279  Add a new connection to the list.
 280  referring_cli == NULL means a new initial connection.
 281 ********************************************************************/
 282
 283 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 284                                struct cli_state *referring_cli,
 285                                const char *server,
 286                                const char *share,
 287                                const struct user_auth_info *auth_info,
 288                                bool show_hdr,
 289                                bool force_encrypt,
 290                                int max_protocol,
 291                                int port,
 292                                int name_type,
 293                                struct cli_state **pcli)
 294 {
 295         struct cli_state *cli;
 296         NTSTATUS status;
 297
 298         status = do_connect(ctx, server, share,
 299                                 auth_info,
 300                                 show_hdr, force_encrypt, max_protocol,
 301                                 port, name_type, &cli);
 302
 303         if (!NT_STATUS_IS_OK(status)) {
 304                 return status;
 305         }
 306
 307         /* Enter into the list. */
 308         if (referring_cli) {
 309                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 310         }
 311
 312         if (referring_cli && referring_cli->requested_posix_capabilities) {
 313                 uint16 major, minor;
 314                 uint32 caplow, caphigh;
 315                 status = cli_unix_extensions_version(cli, &major, &minor,
 316                                                      &caplow, &caphigh);
 317                 if (NT_STATUS_IS_OK(status)) {
 318                         cli_set_unix_extensions_capabilities(cli,
 319                                         major, minor,
 320                                         caplow, caphigh);
 321                 }
 322         }
 323
 324         *pcli = cli;
 325         return NT_STATUS_OK;
 326 }
 327
 328 /********************************************************************
 329  Return a connection to a server on a particular share.
 330 ********************************************************************/
 331
 332 static struct cli_state *cli_cm_find(struct cli_state *cli,
 333                                 const char *server,
 334                                 const char *share)
 335 {
 336         struct cli_state *p;
 337
 338         if (cli == NULL) {
 339                 return NULL;
 340         }
 341
 342         /* Search to the start of the list. */
 343         for (p = cli; p; p = DLIST_PREV(p)) {
 344                 const char *remote_name =
 345                         smbXcli_conn_remote_name(p->conn);
 346
 347                 if (strequal(server, remote_name) &&
 348                                 strequal(share,p->share)) {
 349                         return p;
 350                 }
 351         }
 352
 353         /* Search to the end of the list. */
 354         for (p = cli->next; p; p = p->next) {
 355                 const char *remote_name =
 356                         smbXcli_conn_remote_name(p->conn);
 357
 358                 if (strequal(server, remote_name) &&
 359                                 strequal(share,p->share)) {
 360                         return p;
 361                 }
 362         }
 363
 364         return NULL;
 365 }
 366
 367 /****************************************************************************
 368  Open a client connection to a \\server\share.
 369 ****************************************************************************/
 370
 371 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 372                                 struct cli_state *referring_cli,
 373                                 const char *server,
 374                                 const char *share,
 375                                 const struct user_auth_info *auth_info,
 376                                 bool show_hdr,
 377                                 bool force_encrypt,
 378                                 int max_protocol,
 379                                 int port,
 380                                 int name_type,
 381                                 struct cli_state **pcli)
 382 {
 383         /* Try to reuse an existing connection in this list. */
 384         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 385         NTSTATUS status;
 386
 387         if (c) {
 388                 *pcli = c;
 389                 return NT_STATUS_OK;
 390         }
 391
 392         if (auth_info == NULL) {
 393                 /* Can't do a new connection
 394                  * without auth info. */
 395                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 396                         "without auth info\n",
 397                         server, share );
 398                 return NT_STATUS_INVALID_PARAMETER;
 399         }
 400
 401         status = cli_cm_connect(ctx,
 402                                 referring_cli,
 403                                 server,
 404                                 share,
 405                                 auth_info,
 406                                 show_hdr,
 407                                 force_encrypt,
 408                                 max_protocol,
 409                                 port,
 410                                 name_type,
 411                                 &c);
 412         if (!NT_STATUS_IS_OK(status)) {
 413                 return status;
 414         }
 415         *pcli = c;
 416         return NT_STATUS_OK;
 417 }
 418
 419 /****************************************************************************
 420 ****************************************************************************/
 421
 422 void cli_cm_display(struct cli_state *cli)
 423 {
 424         int i;
 425
 426         for (i=0; cli; cli = cli->next,i++ ) {
 427                 d_printf("%d:\tserver=%s, share=%s\n",
 428                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 429         }
 430 }
 431
 432 /****************************************************************************
 433 ****************************************************************************/
 434
 435 /****************************************************************************
 436 ****************************************************************************/
 437
 438 #if 0
 439 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 440 {
 441         SAFE_FREE(cm_creds.username);
 442         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 443                                                auth_info));
 444
 445         if (get_cmdline_auth_info_got_pass(auth_info)) {
 446                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 447         }
 448
 449         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 450         cm_creds.fallback_after_kerberos = false;
 451         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 452 }
 453 #endif
 454
 455 /**********************************************************************
 456  split a dfs path into the server, share name, and extrapath components
 457 **********************************************************************/
 458
 459 static bool split_dfs_path(TALLOC_CTX *ctx,
 460                                 const char *nodepath,
 461                                 char **pp_server,
 462                                 char **pp_share,
 463                                 char **pp_extrapath)
 464 {
 465         char *p, *q;
 466         char *path;
 467
 468         *pp_server = NULL;
 469         *pp_share = NULL;
 470         *pp_extrapath = NULL;
 471
 472         path = talloc_strdup(ctx, nodepath);
 473         if (!path) {
 474                 goto fail;
 475         }
 476
 477         if ( path[0] != '\\' ) {
 478                 goto fail;
 479         }
 480
 481         p = strchr_m( path + 1, '\\' );
 482         if ( !p ) {
 483                 goto fail;
 484         }
 485
 486         *p = '\0';
 487         p++;
 488
 489         /* Look for any extra/deep path */
 490         q = strchr_m(p, '\\');
 491         if (q != NULL) {
 492                 *q = '\0';
 493                 q++;
 494                 *pp_extrapath = talloc_strdup(ctx, q);
 495         } else {
 496                 *pp_extrapath = talloc_strdup(ctx, "");
 497         }
 498         if (*pp_extrapath == NULL) {
 499                 goto fail;
 500         }
 501
 502         *pp_share = talloc_strdup(ctx, p);
 503         if (*pp_share == NULL) {
 504                 goto fail;
 505         }
 506
 507         *pp_server = talloc_strdup(ctx, &path[1]);
 508         if (*pp_server == NULL) {
 509                 goto fail;
 510         }
 511
 512         TALLOC_FREE(path);
 513         return true;
 514
 515 fail:
 516         TALLOC_FREE(*pp_share);
 517         TALLOC_FREE(*pp_extrapath);
 518         TALLOC_FREE(path);
 519         return false;
 520 }
 521
 522 /****************************************************************************
 523  Return the original path truncated at the directory component before
 524  the first wildcard character. Trust the caller to provide a NULL
 525  terminated string
 526 ****************************************************************************/
 527
 528 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 529 {
 530         size_t len;
 531         char *p1, *p2, *p;
 532         char *path_out;
 533
 534         /* No absolute paths. */
 535         while (IS_DIRECTORY_SEP(*path)) {
 536                 path++;
 537         }
 538
 539         path_out = talloc_strdup(ctx, path);
 540         if (!path_out) {
 541                 return NULL;
 542         }
 543
 544         p1 = strchr_m(path_out, '*');
 545         p2 = strchr_m(path_out, '?');
 546
 547         if (p1 || p2) {
 548                 if (p1 && p2) {
 549                         p = MIN(p1,p2);
 550                 } else if (!p1) {
 551                         p = p2;
 552                 } else {
 553                         p = p1;
 554                 }
 555                 *p = '\0';
 556
 557                 /* Now go back to the start of this component. */
 558                 p1 = strrchr_m(path_out, '/');
 559                 p2 = strrchr_m(path_out, '\\');
 560                 p = MAX(p1,p2);
 561                 if (p) {
 562                         *p = '\0';
 563                 }
 564         }
 565
 566         /* Strip any trailing separator */
 567
 568         len = strlen(path_out);
 569         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 570                 path_out[len-1] = '\0';
 571         }
 572
 573         return path_out;
 574 }
 575
 576 /****************************************************************************
 577 ****************************************************************************/
 578
 579 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 580                                         struct cli_state *cli,
 581                                         const char *dir)
 582 {
 583         char path_sep = '\\';
 584
 585         /* Ensure the extrapath doesn't start with a separator. */
 586         while (IS_DIRECTORY_SEP(*dir)) {
 587                 dir++;
 588         }
 589
 590         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 591                 path_sep = '/';
 592         }
 593         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 594                         path_sep,
 595                         smbXcli_conn_remote_name(cli->conn),
 596                         path_sep,
 597                         cli->share,
 598                         path_sep,
 599                         dir);
 600 }
 601
 602 /********************************************************************
 603  check for dfs referral
 604 ********************************************************************/
 605
 606 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 607                                 NTSTATUS status)
 608 {
 609         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 610
 611         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_UNICODE)) {
 612                 return false;
 613         }
 614         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 615                 return false;
 616         }
 617         if (NT_STATUS_EQUAL(status, expected)) {
 618                 return true;
 619         }
 620         return false;
 621 }
 622
 623 /********************************************************************
 624  Get the dfs referral link.
 625 ********************************************************************/
 626
 627 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 628                         struct cli_state *cli,
 629                         const char *path,
 630                         struct client_dfs_referral **refs,
 631                         size_t *num_refs,
 632                         size_t *consumed)
 633 {
 634         unsigned int data_len = 0;
 635         unsigned int param_len = 0;
 636         uint16_t setup[1];
 637         uint16_t recv_flags2;
 638         uint8_t *param = NULL;
 639         uint8_t *rdata = NULL;
 640         char *p;
 641         char *endp;
 642         smb_ucs2_t *path_ucs;
 643         char *consumed_path = NULL;
 644         uint16_t consumed_ucs;
 645         uint16 num_referrals;
 646         struct client_dfs_referral *referrals = NULL;
 647         NTSTATUS status;
 648         TALLOC_CTX *frame = talloc_stackframe();
 649
 650         *num_refs = 0;
 651         *refs = NULL;
 652
 653         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 654
 655         param = talloc_array(talloc_tos(), uint8_t, 2);
 656         if (!param) {
 657                 status = NT_STATUS_NO_MEMORY;
 658                 goto out;
 659         }
 660         SSVAL(param, 0, 0x03);  /* max referral level */
 661
 662         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 663                                       path, strlen(path)+1,
 664                                       NULL);
 665         if (!param) {
 666                 status = NT_STATUS_NO_MEMORY;
 667                 goto out;
 668         }
 669         param_len = talloc_get_size(param);
 670         path_ucs = (smb_ucs2_t *)&param[2];
 671
 672         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 673                            NULL, 0xffff, 0, 0,
 674                            setup, 1, 0,
 675                            param, param_len, 2,
 676                            NULL, 0, CLI_BUFFER_SIZE,
 677                            &recv_flags2,
 678                            NULL, 0, NULL, /* rsetup */
 679                            NULL, 0, NULL,
 680                            &rdata, 4, &data_len);
 681         if (!NT_STATUS_IS_OK(status)) {
 682                 goto out;
 683         }
 684
 685         endp = (char *)rdata + data_len;
 686
 687         consumed_ucs  = SVAL(rdata, 0);
 688         num_referrals = SVAL(rdata, 2);
 689
 690         /* consumed_ucs is the number of bytes
 691          * of the UCS2 path consumed not counting any
 692          * terminating null. We need to convert
 693          * back to unix charset and count again
 694          * to get the number of bytes consumed from
 695          * the incoming path. */
 696
 697         errno = 0;
 698         if (pull_string_talloc(talloc_tos(),
 699                         NULL,
 700                         0,
 701                         &consumed_path,
 702                         path_ucs,
 703                         consumed_ucs,
 704                         STR_UNICODE) == 0) {
 705                 if (errno != 0) {
 706                         status = map_nt_error_from_unix(errno);
 707                 } else {
 708                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 709                 }
 710                 goto out;
 711         }
 712         if (consumed_path == NULL) {
 713                 status = map_nt_error_from_unix(errno);
 714                 goto out;
 715         }
 716         *consumed = strlen(consumed_path);
 717
 718         if (num_referrals != 0) {
 719                 uint16 ref_version;
 720                 uint16 ref_size;
 721                 int i;
 722                 uint16 node_offset;
 723
 724                 referrals = talloc_array(ctx, struct client_dfs_referral,
 725                                          num_referrals);
 726
 727                 if (!referrals) {
 728                         status = NT_STATUS_NO_MEMORY;
 729                         goto out;
 730                 }
 731                 /* start at the referrals array */
 732
 733                 p = (char *)rdata+8;
 734                 for (i=0; i<num_referrals && p < endp; i++) {
 735                         if (p + 18 > endp) {
 736                                 goto out;
 737                         }
 738                         ref_version = SVAL(p, 0);
 739                         ref_size    = SVAL(p, 2);
 740                         node_offset = SVAL(p, 16);
 741
 742                         if (ref_version != 3) {
 743                                 p += ref_size;
 744                                 continue;
 745                         }
 746
 747                         referrals[i].proximity = SVAL(p, 8);
 748                         referrals[i].ttl       = SVAL(p, 10);
 749
 750                         if (p + node_offset > endp) {
 751                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 752                                 goto out;
 753                         }
 754                         clistr_pull_talloc(referrals,
 755                                            (const char *)rdata,
 756                                            recv_flags2,
 757                                            &referrals[i].dfspath,
 758                                            p+node_offset,
 759                                            PTR_DIFF(endp, p+node_offset),
 760                                            STR_TERMINATE|STR_UNICODE);
 761
 762                         if (!referrals[i].dfspath) {
 763                                 status = map_nt_error_from_unix(errno);
 764                                 goto out;
 765                         }
 766                         p += ref_size;
 767                 }
 768                 if (i < num_referrals) {
 769                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 770                         goto out;
 771                 }
 772         }
 773
 774         *num_refs = num_referrals;
 775         *refs = referrals;
 776
 777   out:
 778
 779         TALLOC_FREE(frame);
 780         return status;
 781 }
 782
 783 /********************************************************************
 784 ********************************************************************/
 785
 786 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 787                           const char *mountpt,
 788                           const struct user_auth_info *dfs_auth_info,
 789                           struct cli_state *rootcli,
 790                           const char *path,
 791                           struct cli_state **targetcli,
 792                           char **pp_targetpath)
 793 {
 794         struct client_dfs_referral *refs = NULL;
 795         size_t num_refs = 0;
 796         size_t consumed = 0;
 797         struct cli_state *cli_ipc = NULL;
 798         char *dfs_path = NULL;
 799         char *cleanpath = NULL;
 800         char *extrapath = NULL;
 801         int pathlen;
 802         char *server = NULL;
 803         char *share = NULL;
 804         struct cli_state *newcli = NULL;
 805         char *newpath = NULL;
 806         char *newmount = NULL;
 807         char *ppath = NULL;
 808         SMB_STRUCT_STAT sbuf;
 809         uint32 attributes;
 810         NTSTATUS status;
 811
 812         if ( !rootcli || !path || !targetcli ) {
 813                 return NT_STATUS_INVALID_PARAMETER;
 814         }
 815
 816         /* Don't do anything if this is not a DFS root. */
 817
 818         if ( !rootcli->dfsroot) {
 819                 *targetcli = rootcli;
 820                 *pp_targetpath = talloc_strdup(ctx, path);
 821                 if (!*pp_targetpath) {
 822                         return NT_STATUS_NO_MEMORY;
 823                 }
 824                 return NT_STATUS_OK;
 825         }
 826
 827         *targetcli = NULL;
 828
 829         /* Send a trans2_query_path_info to check for a referral. */
 830
 831         cleanpath = clean_path(ctx, path);
 832         if (!cleanpath) {
 833                 return NT_STATUS_NO_MEMORY;
 834         }
 835
 836         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 837         if (!dfs_path) {
 838                 return NT_STATUS_NO_MEMORY;
 839         }
 840
 841         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 842         if (NT_STATUS_IS_OK(status)) {
 843                 /* This is an ordinary path, just return it. */
 844                 *targetcli = rootcli;
 845                 *pp_targetpath = talloc_strdup(ctx, path);
 846                 if (!*pp_targetpath) {
 847                         return NT_STATUS_NO_MEMORY;
 848                 }
 849                 goto done;
 850         }
 851
 852         /* Special case where client asked for a path that does not exist */
 853
 854         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 855                                 status)) {
 856                 *targetcli = rootcli;
 857                 *pp_targetpath = talloc_strdup(ctx, path);
 858                 if (!*pp_targetpath) {
 859                         return NT_STATUS_NO_MEMORY;
 860                 }
 861                 goto done;
 862         }
 863
 864         /* We got an error, check for DFS referral. */
 865
 866         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 867                                  status)) {
 868                 return status;
 869         }
 870
 871         /* Check for the referral. */
 872
 873         status = cli_cm_open(ctx,
 874                              rootcli,
 875                              smbXcli_conn_remote_name(rootcli->conn),
 876                              "IPC$",
 877                              dfs_auth_info,
 878                              false,
 879                              smb1cli_conn_encryption_on(rootcli->conn),
 880                              smbXcli_conn_protocol(rootcli->conn),
 881                              0,
 882                              0x20,
 883                              &cli_ipc);
 884         if (!NT_STATUS_IS_OK(status)) {
 885                 return status;
 886         }
 887
 888         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 889                                       &num_refs, &consumed);
 890         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 891                 return status;
 892         }
 893
 894         /* Just store the first referral for now. */
 895
 896         if (!refs[0].dfspath) {
 897                 return NT_STATUS_NOT_FOUND;
 898         }
 899         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 900                             &extrapath)) {
 901                 return NT_STATUS_NOT_FOUND;
 902         }
 903
 904         /* Make sure to recreate the original string including any wildcards. */
 905
 906         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 907         if (!dfs_path) {
 908                 return NT_STATUS_NO_MEMORY;
 909         }
 910         pathlen = strlen(dfs_path);
 911         consumed = MIN(pathlen, consumed);
 912         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 913         if (!*pp_targetpath) {
 914                 return NT_STATUS_NO_MEMORY;
 915         }
 916         dfs_path[consumed] = '\0';
 917
 918         /*
 919          * *pp_targetpath is now the unconsumed part of the path.
 920          * dfs_path is now the consumed part of the path
 921          * (in \server\share\path format).
 922          */
 923
 924         /* Open the connection to the target server & share */
 925         status = cli_cm_open(ctx, rootcli,
 926                              server,
 927                              share,
 928                              dfs_auth_info,
 929                              false,
 930                              smb1cli_conn_encryption_on(rootcli->conn),
 931                              smbXcli_conn_protocol(rootcli->conn),
 932                              0,
 933                              0x20,
 934                              targetcli);
 935         if (!NT_STATUS_IS_OK(status)) {
 936                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 937                         server, share );
 938                 return status;
 939         }
 940
 941         if (extrapath && strlen(extrapath) > 0) {
 942                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 943                 /* put the trailing \ on the path, so to be save we put one in if needed */
 944                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 945                         *pp_targetpath = talloc_asprintf(ctx,
 946                                                   "%s\\%s",
 947                                                   extrapath,
 948                                                   *pp_targetpath);
 949                 } else {
 950                         *pp_targetpath = talloc_asprintf(ctx,
 951                                                   "%s%s",
 952                                                   extrapath,
 953                                                   *pp_targetpath);
 954                 }
 955                 if (!*pp_targetpath) {
 956                         return NT_STATUS_NO_MEMORY;
 957                 }
 958         }
 959
 960         /* parse out the consumed mount path */
 961         /* trim off the \server\share\ */
 962
 963         ppath = dfs_path;
 964
 965         if (*ppath != '\\') {
 966                 d_printf("cli_resolve_path: "
 967                         "dfs_path (%s) not in correct format.\n",
 968                         dfs_path );
 969                 return NT_STATUS_NOT_FOUND;
 970         }
 971
 972         ppath++; /* Now pointing at start of server name. */
 973
 974         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 975                 return NT_STATUS_NOT_FOUND;
 976         }
 977
 978         ppath++; /* Now pointing at start of share name. */
 979
 980         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 981                 return NT_STATUS_NOT_FOUND;
 982         }
 983
 984         ppath++; /* Now pointing at path component. */
 985
 986         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 987         if (!newmount) {
 988                 return NT_STATUS_NOT_FOUND;
 989         }
 990
 991         cli_set_mntpoint(*targetcli, newmount);
 992
 993         /* Check for another dfs referral, note that we are not
 994            checking for loops here. */
 995
 996         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 997                 status = cli_resolve_path(ctx,
 998                                           newmount,
 999                                           dfs_auth_info,
1000                                           *targetcli,
1001                                           *pp_targetpath,
1002                                           &newcli,
1003                                           &newpath);
1004                 if (NT_STATUS_IS_OK(status)) {
1005                         /*
1006                          * When cli_resolve_path returns true here it's always
1007                          * returning the complete path in newpath, so we're done
1008                          * here.
1009                          */
1010                         *targetcli = newcli;
1011                         *pp_targetpath = newpath;
1012                         return status;
1013                 }
1014         }
1015
1016   done:
1017
1018         /* If returning true ensure we return a dfs root full path. */
1019         if ((*targetcli)->dfsroot) {
1020                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1021                 if (!dfs_path) {
1022                         return NT_STATUS_NO_MEMORY;
1023                 }
1024                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1025                 if (*pp_targetpath == NULL) {
1026                         return NT_STATUS_NO_MEMORY;
1027                 }
1028         }
1029
1030         return NT_STATUS_OK;
1031 }
1032
1033 /********************************************************************
1034 ********************************************************************/
1035
1036 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1037                                 struct cli_state *cli,
1038                                 const char *sharename,
1039                                 char **pp_newserver,
1040                                 char **pp_newshare,
1041                                 bool force_encrypt,
1042                                 const char *username,
1043                                 const char *password,
1044                                 const char *domain)
1045 {
1046         struct client_dfs_referral *refs = NULL;
1047         size_t num_refs = 0;
1048         size_t consumed = 0;
1049         char *fullpath = NULL;
1050         bool res;
1051         uint16 cnum;
1052         char *newextrapath = NULL;
1053         NTSTATUS status;
1054         const char *remote_name;
1055
1056         if (!cli || !sharename) {
1057                 return false;
1058         }
1059
1060         remote_name = smbXcli_conn_remote_name(cli->conn);
1061         cnum = cli_state_get_tid(cli);
1062
1063         /* special case.  never check for a referral on the IPC$ share */
1064
1065         if (strequal(sharename, "IPC$")) {
1066                 return false;
1067         }
1068
1069         /* send a trans2_query_path_info to check for a referral */
1070
1071         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1072         if (!fullpath) {
1073                 return false;
1074         }
1075
1076         /* check for the referral */
1077
1078         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL, 0))) {
1079                 return false;
1080         }
1081
1082         if (force_encrypt) {
1083                 status = cli_cm_force_encryption(cli,
1084                                         username,
1085                                         password,
1086                                         lp_workgroup(),
1087                                         "IPC$");
1088                 if (!NT_STATUS_IS_OK(status)) {
1089                         return false;
1090                 }
1091         }
1092
1093         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1094                                       &num_refs, &consumed);
1095         res = NT_STATUS_IS_OK(status);
1096
1097         status = cli_tdis(cli);
1098         if (!NT_STATUS_IS_OK(status)) {
1099                 return false;
1100         }
1101
1102         cli_state_set_tid(cli, cnum);
1103
1104         if (!res || !num_refs) {
1105                 return false;
1106         }
1107
1108         if (!refs[0].dfspath) {
1109                 return false;
1110         }
1111
1112         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1113                             pp_newshare, &newextrapath)) {
1114                 return false;
1115         }
1116
1117         /* check that this is not a self-referral */
1118
1119         if (strequal(remote_name, *pp_newserver) &&
1120                         strequal(sharename, *pp_newshare)) {
1121                 return false;
1122         }
1123
1124         return true;
1125 }