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
  29 /********************************************************************
  30  Important point.
  31
  32  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  33  are not C escaped here).
  34
  35  - but if we're using POSIX paths then <pathname> may contain
  36    '/' separators, not '\\' separators. So cope with '\\' or '/'
  37    as a separator when looking at the pathname part.... JRA.
  38 ********************************************************************/
  39
  40 /********************************************************************
  41  Ensure a connection is encrypted.
  42 ********************************************************************/
  43
  44 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  45                         const char *username,
  46                         const char *password,
  47                         const char *domain,
  48                         const char *sharename)
  49 {
  50         NTSTATUS status = cli_force_encryption(c,
  51                                         username,
  52                                         password,
  53                                         domain);
  54
  55         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  56                 d_printf("Encryption required and "
  57                         "server that doesn't support "
  58                         "UNIX extensions - failing connect\n");
  59         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  60                 d_printf("Encryption required and "
  61                         "can't get UNIX CIFS extensions "
  62                         "version from server.\n");
  63         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  64                 d_printf("Encryption required and "
  65                         "share %s doesn't support "
  66                         "encryption.\n", sharename);
  67         } else if (!NT_STATUS_IS_OK(status)) {
  68                 d_printf("Encryption required and "
  69                         "setup failed with error %s.\n",
  70                         nt_errstr(status));
  71         }
  72
  73         return status;
  74 }
  75
  76 /********************************************************************
  77  Return a connection to a server.
  78 ********************************************************************/
  79
  80 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  81                                         const char *server,
  82                                         const char *share,
  83                                         const struct user_auth_info *auth_info,
  84                                         bool show_sessetup,
  85                                         bool force_encrypt,
  86                                         int max_protocol,
  87                                         int port,
  88                                         int name_type,
  89                                         struct cli_state **pcli)
  90 {
  91         struct cli_state *c = NULL;
  92         char *servicename;
  93         char *sharename;
  94         char *newserver, *newshare;
  95         const char *username;
  96         const char *password;
  97         NTSTATUS status;
  98         int flags = 0;
  99
 100         /* make a copy so we don't modify the global string 'service' */
 101         servicename = talloc_strdup(ctx,share);
 102         if (!servicename) {
 103                 return NT_STATUS_NO_MEMORY;
 104         }
 105         sharename = servicename;
 106         if (*sharename == '\\') {
 107                 sharename += 2;
 108                 if (server == NULL) {
 109                         server = sharename;
 110                 }
 111                 sharename = strchr_m(sharename,'\\');
 112                 if (!sharename) {
 113                         return NT_STATUS_NO_MEMORY;
 114                 }
 115                 *sharename = 0;
 116                 sharename++;
 117         }
 118         if (server == NULL) {
 119                 return NT_STATUS_INVALID_PARAMETER;
 120         }
 121
 122         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 123                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 124         }
 125         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 126                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 127         }
 128         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 129                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 130         }
 131
 132         status = cli_connect_nb(
 133                 server, NULL, port, name_type, NULL,
 134                 get_cmdline_auth_info_signing_state(auth_info),
 135                 flags, &c);
 136
 137         if (!NT_STATUS_IS_OK(status)) {
 138                 d_printf("Connection to %s failed (Error %s)\n",
 139                                 server,
 140                                 nt_errstr(status));
 141                 return status;
 142         }
 143
 144         if (max_protocol == 0) {
 145                 max_protocol = PROTOCOL_NT1;
 146         }
 147         DEBUG(4,(" session request ok\n"));
 148
 149         status = cli_negprot(c, max_protocol);
 150
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 d_printf("protocol negotiation failed: %s\n",
 153                          nt_errstr(status));
 154                 cli_shutdown(c);
 155                 return status;
 156         }
 157
 158         username = get_cmdline_auth_info_username(auth_info);
 159         password = get_cmdline_auth_info_password(auth_info);
 160
 161         status = cli_session_setup(c, username,
 162                                    password, strlen(password),
 163                                    password, strlen(password),
 164                                    lp_workgroup());
 165         if (!NT_STATUS_IS_OK(status)) {
 166                 /* If a password was not supplied then
 167                  * try again with a null username. */
 168                 if (password[0] || !username[0] ||
 169                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 170                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 171                                                 "", 0,
 172                                                 "", 0,
 173                                                lp_workgroup()))) {
 174                         d_printf("session setup failed: %s\n",
 175                                  nt_errstr(status));
 176                         if (NT_STATUS_V(cli_nt_error(c)) ==
 177                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 178                                 d_printf("did you forget to run kinit?\n");
 179                         cli_shutdown(c);
 180                         return status;
 181                 }
 182                 d_printf("Anonymous login successful\n");
 183                 status = cli_init_creds(c, "", lp_workgroup(), "");
 184         } else {
 185                 status = cli_init_creds(c, username, lp_workgroup(), password);
 186         }
 187
 188         if (!NT_STATUS_IS_OK(status)) {
 189                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 190                 cli_shutdown(c);
 191                 return status;
 192         }
 193
 194         if ( show_sessetup ) {
 195                 if (*c->server_domain) {
 196                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 197                                 c->server_domain,c->server_os,c->server_type));
 198                 } else if (*c->server_os || *c->server_type) {
 199                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 200                                  c->server_os,c->server_type));
 201                 }
 202         }
 203         DEBUG(4,(" session setup ok\n"));
 204
 205         /* here's the fun part....to support 'msdfs proxy' shares
 206            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 207            here before trying to connect to the original share.
 208            cli_check_msdfs_proxy() will fail if it is a normal share. */
 209
 210         if ((cli_state_capabilities(c) & CAP_DFS) &&
 211                         cli_check_msdfs_proxy(ctx, c, sharename,
 212                                 &newserver, &newshare,
 213                                 force_encrypt,
 214                                 username,
 215                                 password,
 216                                 lp_workgroup())) {
 217                 cli_shutdown(c);
 218                 return do_connect(ctx, newserver,
 219                                 newshare, auth_info, false,
 220                                 force_encrypt, max_protocol,
 221                                 port, name_type, pcli);
 222         }
 223
 224         /* must be a normal share */
 225
 226         status = cli_tcon_andx(c, sharename, "?????",
 227                                password, strlen(password)+1);
 228         if (!NT_STATUS_IS_OK(status)) {
 229                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 230                 cli_shutdown(c);
 231                 return status;
 232         }
 233
 234         if (force_encrypt) {
 235                 status = cli_cm_force_encryption(c,
 236                                         username,
 237                                         password,
 238                                         lp_workgroup(),
 239                                         sharename);
 240                 if (!NT_STATUS_IS_OK(status)) {
 241                         cli_shutdown(c);
 242                         return status;
 243                 }
 244         }
 245
 246         DEBUG(4,(" tconx ok\n"));
 247         *pcli = c;
 248         return NT_STATUS_OK;
 249 }
 250
 251 /****************************************************************************
 252 ****************************************************************************/
 253
 254 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 255 {
 256         char *name = clean_name(NULL, mnt);
 257         if (!name) {
 258                 return;
 259         }
 260         TALLOC_FREE(cli->dfs_mountpoint);
 261         cli->dfs_mountpoint = talloc_strdup(cli, name);
 262         TALLOC_FREE(name);
 263 }
 264
 265 /********************************************************************
 266  Add a new connection to the list.
 267  referring_cli == NULL means a new initial connection.
 268 ********************************************************************/
 269
 270 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 271                                struct cli_state *referring_cli,
 272                                const char *server,
 273                                const char *share,
 274                                const struct user_auth_info *auth_info,
 275                                bool show_hdr,
 276                                bool force_encrypt,
 277                                int max_protocol,
 278                                int port,
 279                                int name_type,
 280                                struct cli_state **pcli)
 281 {
 282         struct cli_state *cli;
 283         NTSTATUS status;
 284
 285         status = do_connect(ctx, server, share,
 286                                 auth_info,
 287                                 show_hdr, force_encrypt, max_protocol,
 288                                 port, name_type, &cli);
 289
 290         if (!NT_STATUS_IS_OK(status)) {
 291                 return status;
 292         }
 293
 294         /* Enter into the list. */
 295         if (referring_cli) {
 296                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 297         }
 298
 299         if (referring_cli && referring_cli->requested_posix_capabilities) {
 300                 uint16 major, minor;
 301                 uint32 caplow, caphigh;
 302                 status = cli_unix_extensions_version(cli, &major, &minor,
 303                                                      &caplow, &caphigh);
 304                 if (NT_STATUS_IS_OK(status)) {
 305                         cli_set_unix_extensions_capabilities(cli,
 306                                         major, minor,
 307                                         caplow, caphigh);
 308                 }
 309         }
 310
 311         *pcli = cli;
 312         return NT_STATUS_OK;
 313 }
 314
 315 /********************************************************************
 316  Return a connection to a server on a particular share.
 317 ********************************************************************/
 318
 319 static struct cli_state *cli_cm_find(struct cli_state *cli,
 320                                 const char *server,
 321                                 const char *share)
 322 {
 323         struct cli_state *p;
 324
 325         if (cli == NULL) {
 326                 return NULL;
 327         }
 328
 329         /* Search to the start of the list. */
 330         for (p = cli; p; p = DLIST_PREV(p)) {
 331                 const char *remote_name =
 332                         cli_state_remote_name(p);
 333
 334                 if (strequal(server, remote_name) &&
 335                                 strequal(share,p->share)) {
 336                         return p;
 337                 }
 338         }
 339
 340         /* Search to the end of the list. */
 341         for (p = cli->next; p; p = p->next) {
 342                 const char *remote_name =
 343                         cli_state_remote_name(p);
 344
 345                 if (strequal(server, remote_name) &&
 346                                 strequal(share,p->share)) {
 347                         return p;
 348                 }
 349         }
 350
 351         return NULL;
 352 }
 353
 354 /****************************************************************************
 355  Open a client connection to a \\server\share.
 356 ****************************************************************************/
 357
 358 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 359                                 struct cli_state *referring_cli,
 360                                 const char *server,
 361                                 const char *share,
 362                                 const struct user_auth_info *auth_info,
 363                                 bool show_hdr,
 364                                 bool force_encrypt,
 365                                 int max_protocol,
 366                                 int port,
 367                                 int name_type,
 368                                 struct cli_state **pcli)
 369 {
 370         /* Try to reuse an existing connection in this list. */
 371         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 372         NTSTATUS status;
 373
 374         if (c) {
 375                 *pcli = c;
 376                 return NT_STATUS_OK;
 377         }
 378
 379         if (auth_info == NULL) {
 380                 /* Can't do a new connection
 381                  * without auth info. */
 382                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 383                         "without auth info\n",
 384                         server, share );
 385                 return NT_STATUS_INVALID_PARAMETER;
 386         }
 387
 388         status = cli_cm_connect(ctx,
 389                                 referring_cli,
 390                                 server,
 391                                 share,
 392                                 auth_info,
 393                                 show_hdr,
 394                                 force_encrypt,
 395                                 max_protocol,
 396                                 port,
 397                                 name_type,
 398                                 &c);
 399         if (!NT_STATUS_IS_OK(status)) {
 400                 return status;
 401         }
 402         *pcli = c;
 403         return NT_STATUS_OK;
 404 }
 405
 406 /****************************************************************************
 407 ****************************************************************************/
 408
 409 void cli_cm_display(struct cli_state *cli)
 410 {
 411         int i;
 412
 413         for (i=0; cli; cli = cli->next,i++ ) {
 414                 d_printf("%d:\tserver=%s, share=%s\n",
 415                         i, cli_state_remote_name(cli), cli->share);
 416         }
 417 }
 418
 419 /****************************************************************************
 420 ****************************************************************************/
 421
 422 /****************************************************************************
 423 ****************************************************************************/
 424
 425 #if 0
 426 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 427 {
 428         SAFE_FREE(cm_creds.username);
 429         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 430                                                auth_info));
 431
 432         if (get_cmdline_auth_info_got_pass(auth_info)) {
 433                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 434         }
 435
 436         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 437         cm_creds.fallback_after_kerberos = false;
 438         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 439 }
 440 #endif
 441
 442 /**********************************************************************
 443  split a dfs path into the server, share name, and extrapath components
 444 **********************************************************************/
 445
 446 static bool split_dfs_path(TALLOC_CTX *ctx,
 447                                 const char *nodepath,
 448                                 char **pp_server,
 449                                 char **pp_share,
 450                                 char **pp_extrapath)
 451 {
 452         char *p, *q;
 453         char *path;
 454
 455         *pp_server = NULL;
 456         *pp_share = NULL;
 457         *pp_extrapath = NULL;
 458
 459         path = talloc_strdup(ctx, nodepath);
 460         if (!path) {
 461                 goto fail;
 462         }
 463
 464         if ( path[0] != '\\' ) {
 465                 goto fail;
 466         }
 467
 468         p = strchr_m( path + 1, '\\' );
 469         if ( !p ) {
 470                 goto fail;
 471         }
 472
 473         *p = '\0';
 474         p++;
 475
 476         /* Look for any extra/deep path */
 477         q = strchr_m(p, '\\');
 478         if (q != NULL) {
 479                 *q = '\0';
 480                 q++;
 481                 *pp_extrapath = talloc_strdup(ctx, q);
 482         } else {
 483                 *pp_extrapath = talloc_strdup(ctx, "");
 484         }
 485         if (*pp_extrapath == NULL) {
 486                 goto fail;
 487         }
 488
 489         *pp_share = talloc_strdup(ctx, p);
 490         if (*pp_share == NULL) {
 491                 goto fail;
 492         }
 493
 494         *pp_server = talloc_strdup(ctx, &path[1]);
 495         if (*pp_server == NULL) {
 496                 goto fail;
 497         }
 498
 499         TALLOC_FREE(path);
 500         return true;
 501
 502 fail:
 503         TALLOC_FREE(*pp_share);
 504         TALLOC_FREE(*pp_extrapath);
 505         TALLOC_FREE(path);
 506         return false;
 507 }
 508
 509 /****************************************************************************
 510  Return the original path truncated at the directory component before
 511  the first wildcard character. Trust the caller to provide a NULL
 512  terminated string
 513 ****************************************************************************/
 514
 515 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 516 {
 517         size_t len;
 518         char *p1, *p2, *p;
 519         char *path_out;
 520
 521         /* No absolute paths. */
 522         while (IS_DIRECTORY_SEP(*path)) {
 523                 path++;
 524         }
 525
 526         path_out = talloc_strdup(ctx, path);
 527         if (!path_out) {
 528                 return NULL;
 529         }
 530
 531         p1 = strchr_m(path_out, '*');
 532         p2 = strchr_m(path_out, '?');
 533
 534         if (p1 || p2) {
 535                 if (p1 && p2) {
 536                         p = MIN(p1,p2);
 537                 } else if (!p1) {
 538                         p = p2;
 539                 } else {
 540                         p = p1;
 541                 }
 542                 *p = '\0';
 543
 544                 /* Now go back to the start of this component. */
 545                 p1 = strrchr_m(path_out, '/');
 546                 p2 = strrchr_m(path_out, '\\');
 547                 p = MAX(p1,p2);
 548                 if (p) {
 549                         *p = '\0';
 550                 }
 551         }
 552
 553         /* Strip any trailing separator */
 554
 555         len = strlen(path_out);
 556         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 557                 path_out[len-1] = '\0';
 558         }
 559
 560         return path_out;
 561 }
 562
 563 /****************************************************************************
 564 ****************************************************************************/
 565
 566 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 567                                         struct cli_state *cli,
 568                                         const char *dir)
 569 {
 570         char path_sep = '\\';
 571
 572         /* Ensure the extrapath doesn't start with a separator. */
 573         while (IS_DIRECTORY_SEP(*dir)) {
 574                 dir++;
 575         }
 576
 577         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 578                 path_sep = '/';
 579         }
 580         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 581                         path_sep,
 582                         cli_state_remote_name(cli),
 583                         path_sep,
 584                         cli->share,
 585                         path_sep,
 586                         dir);
 587 }
 588
 589 /********************************************************************
 590  check for dfs referral
 591 ********************************************************************/
 592
 593 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 594                                 NTSTATUS status)
 595 {
 596         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 597
 598         if (!(cli_state_capabilities(cli) & CAP_UNICODE)) {
 599                 return false;
 600         }
 601         if (!(cli_state_capabilities(cli) & CAP_STATUS32)) {
 602                 return false;
 603         }
 604         if (NT_STATUS_EQUAL(status, expected)) {
 605                 return true;
 606         }
 607         return false;
 608 }
 609
 610 /********************************************************************
 611  Get the dfs referral link.
 612 ********************************************************************/
 613
 614 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 615                         struct cli_state *cli,
 616                         const char *path,
 617                         struct client_dfs_referral **refs,
 618                         size_t *num_refs,
 619                         size_t *consumed)
 620 {
 621         unsigned int data_len = 0;
 622         unsigned int param_len = 0;
 623         uint16_t setup[1];
 624         uint16_t recv_flags2;
 625         uint8_t *param = NULL;
 626         uint8_t *rdata = NULL;
 627         char *p;
 628         char *endp;
 629         smb_ucs2_t *path_ucs;
 630         char *consumed_path = NULL;
 631         uint16_t consumed_ucs;
 632         uint16 num_referrals;
 633         struct client_dfs_referral *referrals = NULL;
 634         NTSTATUS status;
 635         TALLOC_CTX *frame = talloc_stackframe();
 636
 637         *num_refs = 0;
 638         *refs = NULL;
 639
 640         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 641
 642         param = talloc_array(talloc_tos(), uint8_t, 2);
 643         if (!param) {
 644                 status = NT_STATUS_NO_MEMORY;
 645                 goto out;
 646         }
 647         SSVAL(param, 0, 0x03);  /* max referral level */
 648
 649         param = trans2_bytes_push_str(param, cli_ucs2(cli),
 650                                       path, strlen(path)+1,
 651                                       NULL);
 652         if (!param) {
 653                 status = NT_STATUS_NO_MEMORY;
 654                 goto out;
 655         }
 656         param_len = talloc_get_size(param);
 657         path_ucs = (smb_ucs2_t *)&param[2];
 658
 659         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 660                            NULL, 0xffff, 0, 0,
 661                            setup, 1, 0,
 662                            param, param_len, 2,
 663                            NULL, 0, CLI_BUFFER_SIZE,
 664                            &recv_flags2,
 665                            NULL, 0, NULL, /* rsetup */
 666                            NULL, 0, NULL,
 667                            &rdata, 4, &data_len);
 668         if (!NT_STATUS_IS_OK(status)) {
 669                 goto out;
 670         }
 671
 672         endp = (char *)rdata + data_len;
 673
 674         consumed_ucs  = SVAL(rdata, 0);
 675         num_referrals = SVAL(rdata, 2);
 676
 677         /* consumed_ucs is the number of bytes
 678          * of the UCS2 path consumed not counting any
 679          * terminating null. We need to convert
 680          * back to unix charset and count again
 681          * to get the number of bytes consumed from
 682          * the incoming path. */
 683
 684         errno = 0;
 685         if (pull_string_talloc(talloc_tos(),
 686                         NULL,
 687                         0,
 688                         &consumed_path,
 689                         path_ucs,
 690                         consumed_ucs,
 691                         STR_UNICODE) == 0) {
 692                 if (errno != 0) {
 693                         status = map_nt_error_from_unix(errno);
 694                 } else {
 695                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 696                 }
 697                 goto out;
 698         }
 699         if (consumed_path == NULL) {
 700                 status = map_nt_error_from_unix(errno);
 701                 goto out;
 702         }
 703         *consumed = strlen(consumed_path);
 704
 705         if (num_referrals != 0) {
 706                 uint16 ref_version;
 707                 uint16 ref_size;
 708                 int i;
 709                 uint16 node_offset;
 710
 711                 referrals = talloc_array(ctx, struct client_dfs_referral,
 712                                          num_referrals);
 713
 714                 if (!referrals) {
 715                         status = NT_STATUS_NO_MEMORY;
 716                         goto out;
 717                 }
 718                 /* start at the referrals array */
 719
 720                 p = (char *)rdata+8;
 721                 for (i=0; i<num_referrals && p < endp; i++) {
 722                         if (p + 18 > endp) {
 723                                 goto out;
 724                         }
 725                         ref_version = SVAL(p, 0);
 726                         ref_size    = SVAL(p, 2);
 727                         node_offset = SVAL(p, 16);
 728
 729                         if (ref_version != 3) {
 730                                 p += ref_size;
 731                                 continue;
 732                         }
 733
 734                         referrals[i].proximity = SVAL(p, 8);
 735                         referrals[i].ttl       = SVAL(p, 10);
 736
 737                         if (p + node_offset > endp) {
 738                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 739                                 goto out;
 740                         }
 741                         clistr_pull_talloc(referrals,
 742                                            (const char *)rdata,
 743                                            recv_flags2,
 744                                            &referrals[i].dfspath,
 745                                            p+node_offset,
 746                                            PTR_DIFF(endp, p+node_offset),
 747                                            STR_TERMINATE|STR_UNICODE);
 748
 749                         if (!referrals[i].dfspath) {
 750                                 status = map_nt_error_from_unix(errno);
 751                                 goto out;
 752                         }
 753                         p += ref_size;
 754                 }
 755                 if (i < num_referrals) {
 756                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 757                         goto out;
 758                 }
 759         }
 760
 761         *num_refs = num_referrals;
 762         *refs = referrals;
 763
 764   out:
 765
 766         TALLOC_FREE(frame);
 767         return status;
 768 }
 769
 770 /********************************************************************
 771 ********************************************************************/
 772
 773 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 774                           const char *mountpt,
 775                           const struct user_auth_info *dfs_auth_info,
 776                           struct cli_state *rootcli,
 777                           const char *path,
 778                           struct cli_state **targetcli,
 779                           char **pp_targetpath)
 780 {
 781         struct client_dfs_referral *refs = NULL;
 782         size_t num_refs = 0;
 783         size_t consumed = 0;
 784         struct cli_state *cli_ipc = NULL;
 785         char *dfs_path = NULL;
 786         char *cleanpath = NULL;
 787         char *extrapath = NULL;
 788         int pathlen;
 789         char *server = NULL;
 790         char *share = NULL;
 791         struct cli_state *newcli = NULL;
 792         char *newpath = NULL;
 793         char *newmount = NULL;
 794         char *ppath = NULL;
 795         SMB_STRUCT_STAT sbuf;
 796         uint32 attributes;
 797         NTSTATUS status;
 798
 799         if ( !rootcli || !path || !targetcli ) {
 800                 return NT_STATUS_INVALID_PARAMETER;
 801         }
 802
 803         /* Don't do anything if this is not a DFS root. */
 804
 805         if ( !rootcli->dfsroot) {
 806                 *targetcli = rootcli;
 807                 *pp_targetpath = talloc_strdup(ctx, path);
 808                 if (!*pp_targetpath) {
 809                         return NT_STATUS_NO_MEMORY;
 810                 }
 811                 return NT_STATUS_OK;
 812         }
 813
 814         *targetcli = NULL;
 815
 816         /* Send a trans2_query_path_info to check for a referral. */
 817
 818         cleanpath = clean_path(ctx, path);
 819         if (!cleanpath) {
 820                 return NT_STATUS_NO_MEMORY;
 821         }
 822
 823         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 824         if (!dfs_path) {
 825                 return NT_STATUS_NO_MEMORY;
 826         }
 827
 828         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 829         if (NT_STATUS_IS_OK(status)) {
 830                 /* This is an ordinary path, just return it. */
 831                 *targetcli = rootcli;
 832                 *pp_targetpath = talloc_strdup(ctx, path);
 833                 if (!*pp_targetpath) {
 834                         return NT_STATUS_NO_MEMORY;
 835                 }
 836                 goto done;
 837         }
 838
 839         /* Special case where client asked for a path that does not exist */
 840
 841         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 842                                 status)) {
 843                 *targetcli = rootcli;
 844                 *pp_targetpath = talloc_strdup(ctx, path);
 845                 if (!*pp_targetpath) {
 846                         return NT_STATUS_NO_MEMORY;
 847                 }
 848                 goto done;
 849         }
 850
 851         /* We got an error, check for DFS referral. */
 852
 853         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 854                                  status)) {
 855                 return status;
 856         }
 857
 858         /* Check for the referral. */
 859
 860         status = cli_cm_open(ctx,
 861                              rootcli,
 862                              cli_state_remote_name(rootcli),
 863                              "IPC$",
 864                              dfs_auth_info,
 865                              false,
 866                              cli_state_encryption_on(rootcli),
 867                              cli_state_protocol(rootcli),
 868                              0,
 869                              0x20,
 870                              &cli_ipc);
 871         if (!NT_STATUS_IS_OK(status)) {
 872                 return status;
 873         }
 874
 875         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 876                                       &num_refs, &consumed);
 877         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 878                 return status;
 879         }
 880
 881         /* Just store the first referral for now. */
 882
 883         if (!refs[0].dfspath) {
 884                 return NT_STATUS_NOT_FOUND;
 885         }
 886         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 887                             &extrapath)) {
 888                 return NT_STATUS_NOT_FOUND;
 889         }
 890
 891         /* Make sure to recreate the original string including any wildcards. */
 892
 893         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 894         if (!dfs_path) {
 895                 return NT_STATUS_NO_MEMORY;
 896         }
 897         pathlen = strlen(dfs_path);
 898         consumed = MIN(pathlen, consumed);
 899         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 900         if (!*pp_targetpath) {
 901                 return NT_STATUS_NO_MEMORY;
 902         }
 903         dfs_path[consumed] = '\0';
 904
 905         /*
 906          * *pp_targetpath is now the unconsumed part of the path.
 907          * dfs_path is now the consumed part of the path
 908          * (in \server\share\path format).
 909          */
 910
 911         /* Open the connection to the target server & share */
 912         status = cli_cm_open(ctx, rootcli,
 913                              server,
 914                              share,
 915                              dfs_auth_info,
 916                              false,
 917                              cli_state_encryption_on(rootcli),
 918                              cli_state_protocol(rootcli),
 919                              0,
 920                              0x20,
 921                              targetcli);
 922         if (!NT_STATUS_IS_OK(status)) {
 923                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 924                         server, share );
 925                 return status;
 926         }
 927
 928         if (extrapath && strlen(extrapath) > 0) {
 929                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 930                 /* put the trailing \ on the path, so to be save we put one in if needed */
 931                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 932                         *pp_targetpath = talloc_asprintf(ctx,
 933                                                   "%s\\%s",
 934                                                   extrapath,
 935                                                   *pp_targetpath);
 936                 } else {
 937                         *pp_targetpath = talloc_asprintf(ctx,
 938                                                   "%s%s",
 939                                                   extrapath,
 940                                                   *pp_targetpath);
 941                 }
 942                 if (!*pp_targetpath) {
 943                         return NT_STATUS_NO_MEMORY;
 944                 }
 945         }
 946
 947         /* parse out the consumed mount path */
 948         /* trim off the \server\share\ */
 949
 950         ppath = dfs_path;
 951
 952         if (*ppath != '\\') {
 953                 d_printf("cli_resolve_path: "
 954                         "dfs_path (%s) not in correct format.\n",
 955                         dfs_path );
 956                 return NT_STATUS_NOT_FOUND;
 957         }
 958
 959         ppath++; /* Now pointing at start of server name. */
 960
 961         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 962                 return NT_STATUS_NOT_FOUND;
 963         }
 964
 965         ppath++; /* Now pointing at start of share name. */
 966
 967         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 968                 return NT_STATUS_NOT_FOUND;
 969         }
 970
 971         ppath++; /* Now pointing at path component. */
 972
 973         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 974         if (!newmount) {
 975                 return NT_STATUS_NOT_FOUND;
 976         }
 977
 978         cli_set_mntpoint(*targetcli, newmount);
 979
 980         /* Check for another dfs referral, note that we are not
 981            checking for loops here. */
 982
 983         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 984                 status = cli_resolve_path(ctx,
 985                                           newmount,
 986                                           dfs_auth_info,
 987                                           *targetcli,
 988                                           *pp_targetpath,
 989                                           &newcli,
 990                                           &newpath);
 991                 if (NT_STATUS_IS_OK(status)) {
 992                         /*
 993                          * When cli_resolve_path returns true here it's always
 994                          * returning the complete path in newpath, so we're done
 995                          * here.
 996                          */
 997                         *targetcli = newcli;
 998                         *pp_targetpath = newpath;
 999                         return status;
1000                 }
1001         }
1002
1003   done:
1004
1005         /* If returning true ensure we return a dfs root full path. */
1006         if ((*targetcli)->dfsroot) {
1007                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1008                 if (!dfs_path) {
1009                         return NT_STATUS_NO_MEMORY;
1010                 }
1011                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1012                 if (*pp_targetpath == NULL) {
1013                         return NT_STATUS_NO_MEMORY;
1014                 }
1015         }
1016
1017         return NT_STATUS_OK;
1018 }
1019
1020 /********************************************************************
1021 ********************************************************************/
1022
1023 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1024                                 struct cli_state *cli,
1025                                 const char *sharename,
1026                                 char **pp_newserver,
1027                                 char **pp_newshare,
1028                                 bool force_encrypt,
1029                                 const char *username,
1030                                 const char *password,
1031                                 const char *domain)
1032 {
1033         struct client_dfs_referral *refs = NULL;
1034         size_t num_refs = 0;
1035         size_t consumed = 0;
1036         char *fullpath = NULL;
1037         bool res;
1038         uint16 cnum;
1039         char *newextrapath = NULL;
1040         NTSTATUS status;
1041         const char *remote_name;
1042
1043         if (!cli || !sharename) {
1044                 return false;
1045         }
1046
1047         remote_name = cli_state_remote_name(cli);
1048         cnum = cli_state_get_tid(cli);
1049
1050         /* special case.  never check for a referral on the IPC$ share */
1051
1052         if (strequal(sharename, "IPC$")) {
1053                 return false;
1054         }
1055
1056         /* send a trans2_query_path_info to check for a referral */
1057
1058         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1059         if (!fullpath) {
1060                 return false;
1061         }
1062
1063         /* check for the referral */
1064
1065         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1066                 return false;
1067         }
1068
1069         if (force_encrypt) {
1070                 status = cli_cm_force_encryption(cli,
1071                                         username,
1072                                         password,
1073                                         lp_workgroup(),
1074                                         "IPC$");
1075                 if (!NT_STATUS_IS_OK(status)) {
1076                         return false;
1077                 }
1078         }
1079
1080         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1081                                       &num_refs, &consumed);
1082         res = NT_STATUS_IS_OK(status);
1083
1084         status = cli_tdis(cli);
1085         if (!NT_STATUS_IS_OK(status)) {
1086                 return false;
1087         }
1088
1089         cli_state_set_tid(cli, cnum);
1090
1091         if (!res || !num_refs) {
1092                 return false;
1093         }
1094
1095         if (!refs[0].dfspath) {
1096                 return false;
1097         }
1098
1099         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1100                             pp_newshare, &newextrapath)) {
1101                 return false;
1102         }
1103
1104         /* check that this is not a self-referral */
1105
1106         if (strequal(remote_name, *pp_newserver) &&
1107                         strequal(sharename, *pp_newshare)) {
1108                 return false;
1109         }
1110
1111         return true;
1112 }