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 struct cli_state *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 {
  90         struct cli_state *c = NULL;
  91         char *servicename;
  92         char *sharename;
  93         char *newserver, *newshare;
  94         const char *username;
  95         const char *password;
  96         NTSTATUS status;
  97
  98         /* make a copy so we don't modify the global string 'service' */
  99         servicename = talloc_strdup(ctx,share);
 100         if (!servicename) {
 101                 return NULL;
 102         }
 103         sharename = servicename;
 104         if (*sharename == '\\') {
 105                 sharename += 2;
 106                 if (server == NULL) {
 107                         server = sharename;
 108                 }
 109                 sharename = strchr_m(sharename,'\\');
 110                 if (!sharename) {
 111                         return NULL;
 112                 }
 113                 *sharename = 0;
 114                 sharename++;
 115         }
 116         if (server == NULL) {
 117                 return NULL;
 118         }
 119
 120         status = cli_connect_nb(
 121                 server, NULL, port, name_type, NULL,
 122                 get_cmdline_auth_info_signing_state(auth_info), &c);
 123
 124         if (!NT_STATUS_IS_OK(status)) {
 125                 d_printf("Connection to %s failed (Error %s)\n",
 126                                 server,
 127                                 nt_errstr(status));
 128                 return NULL;
 129         }
 130
 131         if (max_protocol == 0) {
 132                 max_protocol = PROTOCOL_NT1;
 133         }
 134         c->protocol = max_protocol;
 135         c->use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 136         c->fallback_after_kerberos =
 137                 get_cmdline_auth_info_fallback_after_kerberos(auth_info);
 138         c->use_ccache = get_cmdline_auth_info_use_ccache(auth_info);
 139
 140         DEBUG(4,(" session request ok\n"));
 141
 142         status = cli_negprot(c);
 143
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 d_printf("protocol negotiation failed: %s\n",
 146                          nt_errstr(status));
 147                 cli_shutdown(c);
 148                 return NULL;
 149         }
 150
 151         username = get_cmdline_auth_info_username(auth_info);
 152         password = get_cmdline_auth_info_password(auth_info);
 153
 154         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 155                                                password, strlen(password),
 156                                                password, strlen(password),
 157                                                lp_workgroup()))) {
 158                 /* If a password was not supplied then
 159                  * try again with a null username. */
 160                 if (password[0] || !username[0] ||
 161                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 162                         !NT_STATUS_IS_OK(cli_session_setup(c, "",
 163                                                 "", 0,
 164                                                 "", 0,
 165                                                lp_workgroup()))) {
 166                         d_printf("session setup failed: %s\n", cli_errstr(c));
 167                         if (NT_STATUS_V(cli_nt_error(c)) ==
 168                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 169                                 d_printf("did you forget to run kinit?\n");
 170                         cli_shutdown(c);
 171                         return NULL;
 172                 }
 173                 d_printf("Anonymous login successful\n");
 174                 status = cli_init_creds(c, "", lp_workgroup(), "");
 175         } else {
 176                 status = cli_init_creds(c, username, lp_workgroup(), password);
 177         }
 178
 179         if (!NT_STATUS_IS_OK(status)) {
 180                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 181                 cli_shutdown(c);
 182                 return NULL;
 183         }
 184
 185         if ( show_sessetup ) {
 186                 if (*c->server_domain) {
 187                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 188                                 c->server_domain,c->server_os,c->server_type));
 189                 } else if (*c->server_os || *c->server_type) {
 190                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 191                                  c->server_os,c->server_type));
 192                 }
 193         }
 194         DEBUG(4,(" session setup ok\n"));
 195
 196         /* here's the fun part....to support 'msdfs proxy' shares
 197            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 198            here before trying to connect to the original share.
 199            cli_check_msdfs_proxy() will fail if it is a normal share. */
 200
 201         if ((c->capabilities & CAP_DFS) &&
 202                         cli_check_msdfs_proxy(ctx, c, sharename,
 203                                 &newserver, &newshare,
 204                                 force_encrypt,
 205                                 username,
 206                                 password,
 207                                 lp_workgroup())) {
 208                 cli_shutdown(c);
 209                 return do_connect(ctx, newserver,
 210                                 newshare, auth_info, false,
 211                                 force_encrypt, max_protocol,
 212                                 port, name_type);
 213         }
 214
 215         /* must be a normal share */
 216
 217         status = cli_tcon_andx(c, sharename, "?????",
 218                                password, strlen(password)+1);
 219         if (!NT_STATUS_IS_OK(status)) {
 220                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 221                 cli_shutdown(c);
 222                 return NULL;
 223         }
 224
 225         if (force_encrypt) {
 226                 status = cli_cm_force_encryption(c,
 227                                         username,
 228                                         password,
 229                                         lp_workgroup(),
 230                                         sharename);
 231                 if (!NT_STATUS_IS_OK(status)) {
 232                         cli_shutdown(c);
 233                         return NULL;
 234                 }
 235         }
 236
 237         DEBUG(4,(" tconx ok\n"));
 238         return c;
 239 }
 240
 241 /****************************************************************************
 242 ****************************************************************************/
 243
 244 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 245 {
 246         char *name = clean_name(NULL, mnt);
 247         if (!name) {
 248                 return;
 249         }
 250         TALLOC_FREE(cli->dfs_mountpoint);
 251         cli->dfs_mountpoint = talloc_strdup(cli, name);
 252         TALLOC_FREE(name);
 253 }
 254
 255 /********************************************************************
 256  Add a new connection to the list.
 257  referring_cli == NULL means a new initial connection.
 258 ********************************************************************/
 259
 260 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 261                                         struct cli_state *referring_cli,
 262                                         const char *server,
 263                                         const char *share,
 264                                         const struct user_auth_info *auth_info,
 265                                         bool show_hdr,
 266                                         bool force_encrypt,
 267                                         int max_protocol,
 268                                         int port,
 269                                         int name_type)
 270 {
 271         struct cli_state *cli;
 272
 273         cli = do_connect(ctx, server, share,
 274                                 auth_info,
 275                                 show_hdr, force_encrypt, max_protocol,
 276                                 port, name_type);
 277
 278         if (!cli ) {
 279                 return NULL;
 280         }
 281
 282         /* Enter into the list. */
 283         if (referring_cli) {
 284                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 285         }
 286
 287         if (referring_cli && referring_cli->requested_posix_capabilities) {
 288                 uint16 major, minor;
 289                 uint32 caplow, caphigh;
 290                 NTSTATUS status;
 291                 status = cli_unix_extensions_version(cli, &major, &minor,
 292                                                      &caplow, &caphigh);
 293                 if (NT_STATUS_IS_OK(status)) {
 294                         cli_set_unix_extensions_capabilities(cli,
 295                                         major, minor,
 296                                         caplow, caphigh);
 297                 }
 298         }
 299
 300         return cli;
 301 }
 302
 303 /********************************************************************
 304  Return a connection to a server on a particular share.
 305 ********************************************************************/
 306
 307 static struct cli_state *cli_cm_find(struct cli_state *cli,
 308                                 const char *server,
 309                                 const char *share)
 310 {
 311         struct cli_state *p;
 312
 313         if (cli == NULL) {
 314                 return NULL;
 315         }
 316
 317         /* Search to the start of the list. */
 318         for (p = cli; p; p = DLIST_PREV(p)) {
 319                 if (strequal(server, p->desthost) &&
 320                                 strequal(share,p->share)) {
 321                         return p;
 322                 }
 323         }
 324
 325         /* Search to the end of the list. */
 326         for (p = cli->next; p; p = p->next) {
 327                 if (strequal(server, p->desthost) &&
 328                                 strequal(share,p->share)) {
 329                         return p;
 330                 }
 331         }
 332
 333         return NULL;
 334 }
 335
 336 /****************************************************************************
 337  Open a client connection to a \\server\share.
 338 ****************************************************************************/
 339
 340 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 341                                 struct cli_state *referring_cli,
 342                                 const char *server,
 343                                 const char *share,
 344                                 const struct user_auth_info *auth_info,
 345                                 bool show_hdr,
 346                                 bool force_encrypt,
 347                                 int max_protocol,
 348                                 int port,
 349                                 int name_type)
 350 {
 351         /* Try to reuse an existing connection in this list. */
 352         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 353
 354         if (c) {
 355                 return c;
 356         }
 357
 358         if (auth_info == NULL) {
 359                 /* Can't do a new connection
 360                  * without auth info. */
 361                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 362                         "without auth info\n",
 363                         server, share );
 364                 return NULL;
 365         }
 366
 367         return cli_cm_connect(ctx,
 368                                 referring_cli,
 369                                 server,
 370                                 share,
 371                                 auth_info,
 372                                 show_hdr,
 373                                 force_encrypt,
 374                                 max_protocol,
 375                                 port,
 376                                 name_type);
 377 }
 378
 379 /****************************************************************************
 380 ****************************************************************************/
 381
 382 void cli_cm_display(const struct cli_state *cli)
 383 {
 384         int i;
 385
 386         for (i=0; cli; cli = cli->next,i++ ) {
 387                 d_printf("%d:\tserver=%s, share=%s\n",
 388                         i, cli->desthost, cli->share );
 389         }
 390 }
 391
 392 /****************************************************************************
 393 ****************************************************************************/
 394
 395 /****************************************************************************
 396 ****************************************************************************/
 397
 398 #if 0
 399 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 400 {
 401         SAFE_FREE(cm_creds.username);
 402         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 403                                                auth_info));
 404
 405         if (get_cmdline_auth_info_got_pass(auth_info)) {
 406                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 407         }
 408
 409         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 410         cm_creds.fallback_after_kerberos = false;
 411         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 412 }
 413 #endif
 414
 415 /**********************************************************************
 416  split a dfs path into the server, share name, and extrapath components
 417 **********************************************************************/
 418
 419 static bool split_dfs_path(TALLOC_CTX *ctx,
 420                                 const char *nodepath,
 421                                 char **pp_server,
 422                                 char **pp_share,
 423                                 char **pp_extrapath)
 424 {
 425         char *p, *q;
 426         char *path;
 427
 428         *pp_server = NULL;
 429         *pp_share = NULL;
 430         *pp_extrapath = NULL;
 431
 432         path = talloc_strdup(ctx, nodepath);
 433         if (!path) {
 434                 goto fail;
 435         }
 436
 437         if ( path[0] != '\\' ) {
 438                 goto fail;
 439         }
 440
 441         p = strchr_m( path + 1, '\\' );
 442         if ( !p ) {
 443                 goto fail;
 444         }
 445
 446         *p = '\0';
 447         p++;
 448
 449         /* Look for any extra/deep path */
 450         q = strchr_m(p, '\\');
 451         if (q != NULL) {
 452                 *q = '\0';
 453                 q++;
 454                 *pp_extrapath = talloc_strdup(ctx, q);
 455         } else {
 456                 *pp_extrapath = talloc_strdup(ctx, "");
 457         }
 458         if (*pp_extrapath == NULL) {
 459                 goto fail;
 460         }
 461
 462         *pp_share = talloc_strdup(ctx, p);
 463         if (*pp_share == NULL) {
 464                 goto fail;
 465         }
 466
 467         *pp_server = talloc_strdup(ctx, &path[1]);
 468         if (*pp_server == NULL) {
 469                 goto fail;
 470         }
 471
 472         TALLOC_FREE(path);
 473         return true;
 474
 475 fail:
 476         TALLOC_FREE(*pp_share);
 477         TALLOC_FREE(*pp_extrapath);
 478         TALLOC_FREE(path);
 479         return false;
 480 }
 481
 482 /****************************************************************************
 483  Return the original path truncated at the directory component before
 484  the first wildcard character. Trust the caller to provide a NULL
 485  terminated string
 486 ****************************************************************************/
 487
 488 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 489 {
 490         size_t len;
 491         char *p1, *p2, *p;
 492         char *path_out;
 493
 494         /* No absolute paths. */
 495         while (IS_DIRECTORY_SEP(*path)) {
 496                 path++;
 497         }
 498
 499         path_out = talloc_strdup(ctx, path);
 500         if (!path_out) {
 501                 return NULL;
 502         }
 503
 504         p1 = strchr_m(path_out, '*');
 505         p2 = strchr_m(path_out, '?');
 506
 507         if (p1 || p2) {
 508                 if (p1 && p2) {
 509                         p = MIN(p1,p2);
 510                 } else if (!p1) {
 511                         p = p2;
 512                 } else {
 513                         p = p1;
 514                 }
 515                 *p = '\0';
 516
 517                 /* Now go back to the start of this component. */
 518                 p1 = strrchr_m(path_out, '/');
 519                 p2 = strrchr_m(path_out, '\\');
 520                 p = MAX(p1,p2);
 521                 if (p) {
 522                         *p = '\0';
 523                 }
 524         }
 525
 526         /* Strip any trailing separator */
 527
 528         len = strlen(path_out);
 529         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 530                 path_out[len-1] = '\0';
 531         }
 532
 533         return path_out;
 534 }
 535
 536 /****************************************************************************
 537 ****************************************************************************/
 538
 539 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 540                                         struct cli_state *cli,
 541                                         const char *dir)
 542 {
 543         char path_sep = '\\';
 544
 545         /* Ensure the extrapath doesn't start with a separator. */
 546         while (IS_DIRECTORY_SEP(*dir)) {
 547                 dir++;
 548         }
 549
 550         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 551                 path_sep = '/';
 552         }
 553         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 554                         path_sep,
 555                         cli->desthost,
 556                         path_sep,
 557                         cli->share,
 558                         path_sep,
 559                         dir);
 560 }
 561
 562 /********************************************************************
 563  check for dfs referral
 564 ********************************************************************/
 565
 566 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 567                                 NTSTATUS status)
 568 {
 569         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 570
 571         if (!(cli->capabilities & CAP_UNICODE)) {
 572                 return false;
 573         }
 574         if (!(cli->capabilities & CAP_STATUS32)) {
 575                 return false;
 576         }
 577         if (NT_STATUS_EQUAL(status, expected)) {
 578                 return true;
 579         }
 580         return false;
 581 }
 582
 583 /********************************************************************
 584  Get the dfs referral link.
 585 ********************************************************************/
 586
 587 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 588                         struct cli_state *cli,
 589                         const char *path,
 590                         struct client_dfs_referral **refs,
 591                         size_t *num_refs,
 592                         size_t *consumed)
 593 {
 594         unsigned int data_len = 0;
 595         unsigned int param_len = 0;
 596         uint16 setup[1];
 597         uint8_t *param = NULL;
 598         uint8_t *rdata = NULL;
 599         char *p;
 600         char *endp;
 601         size_t pathlen = 2*(strlen(path)+1);
 602         smb_ucs2_t *path_ucs;
 603         char *consumed_path = NULL;
 604         uint16_t consumed_ucs;
 605         uint16 num_referrals;
 606         struct client_dfs_referral *referrals = NULL;
 607         NTSTATUS status;
 608
 609         *num_refs = 0;
 610         *refs = NULL;
 611
 612         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 613
 614         param = SMB_MALLOC_ARRAY(uint8_t, 2+pathlen+2);
 615         if (!param) {
 616                 status = NT_STATUS_NO_MEMORY;
 617                 goto out;
 618         }
 619         SSVAL(param, 0, 0x03);  /* max referral level */
 620         p = (char *)(&param[2]);
 621
 622         path_ucs = (smb_ucs2_t *)p;
 623         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 624         param_len = PTR_DIFF(p, param);
 625
 626         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 627                            NULL, 0xffff, 0, 0,
 628                            setup, 1, 0,
 629                            param, param_len, 2,
 630                            NULL, 0, cli->max_xmit,
 631                            NULL,
 632                            NULL, 0, NULL, /* rsetup */
 633                            NULL, 0, NULL,
 634                            &rdata, 4, &data_len);
 635         if (!NT_STATUS_IS_OK(status)) {
 636                 goto out;
 637         }
 638         if (data_len < 4) {
 639                 goto out;
 640         }
 641
 642         endp = (char *)rdata + data_len;
 643
 644         consumed_ucs  = SVAL(rdata, 0);
 645         num_referrals = SVAL(rdata, 2);
 646
 647         /* consumed_ucs is the number of bytes
 648          * of the UCS2 path consumed not counting any
 649          * terminating null. We need to convert
 650          * back to unix charset and count again
 651          * to get the number of bytes consumed from
 652          * the incoming path. */
 653
 654         if (pull_string_talloc(talloc_tos(),
 655                         NULL,
 656                         0,
 657                         &consumed_path,
 658                         path_ucs,
 659                         consumed_ucs,
 660                         STR_UNICODE) == 0) {
 661                 goto out;
 662         }
 663         if (consumed_path == NULL) {
 664                 goto out;
 665         }
 666         *consumed = strlen(consumed_path);
 667
 668         if (num_referrals != 0) {
 669                 uint16 ref_version;
 670                 uint16 ref_size;
 671                 int i;
 672                 uint16 node_offset;
 673
 674                 referrals = talloc_array(ctx, struct client_dfs_referral,
 675                                          num_referrals);
 676
 677                 if (!referrals) {
 678                         goto out;
 679                 }
 680                 /* start at the referrals array */
 681
 682                 p = (char *)rdata+8;
 683                 for (i=0; i<num_referrals && p < endp; i++) {
 684                         if (p + 18 > endp) {
 685                                 goto out;
 686                         }
 687                         ref_version = SVAL(p, 0);
 688                         ref_size    = SVAL(p, 2);
 689                         node_offset = SVAL(p, 16);
 690
 691                         if (ref_version != 3) {
 692                                 p += ref_size;
 693                                 continue;
 694                         }
 695
 696                         referrals[i].proximity = SVAL(p, 8);
 697                         referrals[i].ttl       = SVAL(p, 10);
 698
 699                         if (p + node_offset > endp) {
 700                                 goto out;
 701                         }
 702                         clistr_pull_talloc(ctx, cli->inbuf,
 703                                            SVAL(cli->inbuf, smb_flg2),
 704                                            &referrals[i].dfspath,
 705                                            p+node_offset,
 706                                            cli->bufsize - ((p+node_offset)-cli->inbuf),
 707                                            STR_TERMINATE|STR_UNICODE);
 708
 709                         if (!referrals[i].dfspath) {
 710                                 goto out;
 711                         }
 712                         p += ref_size;
 713                 }
 714                 if (i < num_referrals) {
 715                         goto out;
 716                 }
 717         }
 718
 719         *num_refs = num_referrals;
 720         *refs = referrals;
 721
 722   out:
 723
 724         TALLOC_FREE(consumed_path);
 725         SAFE_FREE(param);
 726         TALLOC_FREE(rdata);
 727         return status;
 728 }
 729
 730 /********************************************************************
 731 ********************************************************************/
 732
 733 bool cli_resolve_path(TALLOC_CTX *ctx,
 734                         const char *mountpt,
 735                         const struct user_auth_info *dfs_auth_info,
 736                         struct cli_state *rootcli,
 737                         const char *path,
 738                         struct cli_state **targetcli,
 739                         char **pp_targetpath)
 740 {
 741         struct client_dfs_referral *refs = NULL;
 742         size_t num_refs = 0;
 743         size_t consumed = 0;
 744         struct cli_state *cli_ipc = NULL;
 745         char *dfs_path = NULL;
 746         char *cleanpath = NULL;
 747         char *extrapath = NULL;
 748         int pathlen;
 749         char *server = NULL;
 750         char *share = NULL;
 751         struct cli_state *newcli = NULL;
 752         char *newpath = NULL;
 753         char *newmount = NULL;
 754         char *ppath = NULL;
 755         SMB_STRUCT_STAT sbuf;
 756         uint32 attributes;
 757         NTSTATUS status;
 758
 759         if ( !rootcli || !path || !targetcli ) {
 760                 return false;
 761         }
 762
 763         /* Don't do anything if this is not a DFS root. */
 764
 765         if ( !rootcli->dfsroot) {
 766                 *targetcli = rootcli;
 767                 *pp_targetpath = talloc_strdup(ctx, path);
 768                 if (!*pp_targetpath) {
 769                         return false;
 770                 }
 771                 return true;
 772         }
 773
 774         *targetcli = NULL;
 775
 776         /* Send a trans2_query_path_info to check for a referral. */
 777
 778         cleanpath = clean_path(ctx, path);
 779         if (!cleanpath) {
 780                 return false;
 781         }
 782
 783         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 784         if (!dfs_path) {
 785                 return false;
 786         }
 787
 788         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 789         if (NT_STATUS_IS_OK(status)) {
 790                 /* This is an ordinary path, just return it. */
 791                 *targetcli = rootcli;
 792                 *pp_targetpath = talloc_strdup(ctx, path);
 793                 if (!*pp_targetpath) {
 794                         return false;
 795                 }
 796                 goto done;
 797         }
 798
 799         /* Special case where client asked for a path that does not exist */
 800
 801         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 802                                 status)) {
 803                 *targetcli = rootcli;
 804                 *pp_targetpath = talloc_strdup(ctx, path);
 805                 if (!*pp_targetpath) {
 806                         return false;
 807                 }
 808                 goto done;
 809         }
 810
 811         /* We got an error, check for DFS referral. */
 812
 813         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 814                                  status)) {
 815                 return false;
 816         }
 817
 818         /* Check for the referral. */
 819
 820         if (!(cli_ipc = cli_cm_open(ctx,
 821                                 rootcli,
 822                                 rootcli->desthost,
 823                                 "IPC$",
 824                                 dfs_auth_info,
 825                                 false,
 826                                 (rootcli->trans_enc_state != NULL),
 827                                 rootcli->protocol,
 828                                 0,
 829                                 0x20))) {
 830                 return false;
 831         }
 832
 833         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 834                                       &num_refs, &consumed);
 835         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 836                 return false;
 837         }
 838
 839         /* Just store the first referral for now. */
 840
 841         if (!refs[0].dfspath) {
 842                 return false;
 843         }
 844         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 845                             &extrapath)) {
 846                 return false;
 847         }
 848
 849         /* Make sure to recreate the original string including any wildcards. */
 850
 851         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 852         if (!dfs_path) {
 853                 return false;
 854         }
 855         pathlen = strlen(dfs_path);
 856         consumed = MIN(pathlen, consumed);
 857         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 858         if (!*pp_targetpath) {
 859                 return false;
 860         }
 861         dfs_path[consumed] = '\0';
 862
 863         /*
 864          * *pp_targetpath is now the unconsumed part of the path.
 865          * dfs_path is now the consumed part of the path
 866          * (in \server\share\path format).
 867          */
 868
 869         /* Open the connection to the target server & share */
 870         if ((*targetcli = cli_cm_open(ctx, rootcli,
 871                                         server,
 872                                         share,
 873                                         dfs_auth_info,
 874                                         false,
 875                                         (rootcli->trans_enc_state != NULL),
 876                                         rootcli->protocol,
 877                                         0,
 878                                         0x20)) == NULL) {
 879                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 880                         server, share );
 881                 return false;
 882         }
 883
 884         if (extrapath && strlen(extrapath) > 0) {
 885                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 886                 /* put the trailing \ on the path, so to be save we put one in if needed */
 887                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 888                         *pp_targetpath = talloc_asprintf(ctx,
 889                                                   "%s\\%s",
 890                                                   extrapath,
 891                                                   *pp_targetpath);
 892                 } else {
 893                         *pp_targetpath = talloc_asprintf(ctx,
 894                                                   "%s%s",
 895                                                   extrapath,
 896                                                   *pp_targetpath);
 897                 }
 898                 if (!*pp_targetpath) {
 899                         return false;
 900                 }
 901         }
 902
 903         /* parse out the consumed mount path */
 904         /* trim off the \server\share\ */
 905
 906         ppath = dfs_path;
 907
 908         if (*ppath != '\\') {
 909                 d_printf("cli_resolve_path: "
 910                         "dfs_path (%s) not in correct format.\n",
 911                         dfs_path );
 912                 return false;
 913         }
 914
 915         ppath++; /* Now pointing at start of server name. */
 916
 917         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 918                 return false;
 919         }
 920
 921         ppath++; /* Now pointing at start of share name. */
 922
 923         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 924                 return false;
 925         }
 926
 927         ppath++; /* Now pointing at path component. */
 928
 929         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 930         if (!newmount) {
 931                 return false;
 932         }
 933
 934         cli_set_mntpoint(*targetcli, newmount);
 935
 936         /* Check for another dfs referral, note that we are not
 937            checking for loops here. */
 938
 939         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 940                 if (cli_resolve_path(ctx,
 941                                         newmount,
 942                                         dfs_auth_info,
 943                                         *targetcli,
 944                                         *pp_targetpath,
 945                                         &newcli,
 946                                         &newpath)) {
 947                         /*
 948                          * When cli_resolve_path returns true here it's always
 949                          * returning the complete path in newpath, so we're done
 950                          * here.
 951                          */
 952                         *targetcli = newcli;
 953                         *pp_targetpath = newpath;
 954                         return true;
 955                 }
 956         }
 957
 958   done:
 959
 960         /* If returning true ensure we return a dfs root full path. */
 961         if ((*targetcli)->dfsroot) {
 962                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 963                 if (!dfs_path) {
 964                         return false;
 965                 }
 966                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 967         }
 968
 969         return true;
 970 }
 971
 972 /********************************************************************
 973 ********************************************************************/
 974
 975 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 976                                 struct cli_state *cli,
 977                                 const char *sharename,
 978                                 char **pp_newserver,
 979                                 char **pp_newshare,
 980                                 bool force_encrypt,
 981                                 const char *username,
 982                                 const char *password,
 983                                 const char *domain)
 984 {
 985         struct client_dfs_referral *refs = NULL;
 986         size_t num_refs = 0;
 987         size_t consumed = 0;
 988         char *fullpath = NULL;
 989         bool res;
 990         uint16 cnum;
 991         char *newextrapath = NULL;
 992         NTSTATUS status;
 993
 994         if (!cli || !sharename) {
 995                 return false;
 996         }
 997
 998         cnum = cli->cnum;
 999
1000         /* special case.  never check for a referral on the IPC$ share */
1001
1002         if (strequal(sharename, "IPC$")) {
1003                 return false;
1004         }
1005
1006         /* send a trans2_query_path_info to check for a referral */
1007
1008         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1009         if (!fullpath) {
1010                 return false;
1011         }
1012
1013         /* check for the referral */
1014
1015         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1016                 return false;
1017         }
1018
1019         if (force_encrypt) {
1020                 status = cli_cm_force_encryption(cli,
1021                                         username,
1022                                         password,
1023                                         lp_workgroup(),
1024                                         "IPC$");
1025                 if (!NT_STATUS_IS_OK(status)) {
1026                         return false;
1027                 }
1028         }
1029
1030         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1031                                       &num_refs, &consumed);
1032         res = NT_STATUS_IS_OK(status);
1033
1034         status = cli_tdis(cli);
1035         if (!NT_STATUS_IS_OK(status)) {
1036                 return false;
1037         }
1038
1039         cli->cnum = cnum;
1040
1041         if (!res || !num_refs) {
1042                 return false;
1043         }
1044
1045         if (!refs[0].dfspath) {
1046                 return false;
1047         }
1048
1049         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1050                             pp_newshare, &newextrapath)) {
1051                 return false;
1052         }
1053
1054         /* check that this is not a self-referral */
1055
1056         if (strequal(cli->desthost, *pp_newserver) &&
1057                         strequal(sharename, *pp_newshare)) {
1058                 return false;
1059         }
1060
1061         return true;
1062 }