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