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
  24 /********************************************************************
  25  Important point.
  26
  27  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  28  are not C escaped here).
  29
  30  - but if we're using POSIX paths then <pathname> may contain
  31    '/' separators, not '\\' separators. So cope with '\\' or '/'
  32    as a separator when looking at the pathname part.... JRA.
  33 ********************************************************************/
  34
  35 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
  36                                 struct cli_state *cli,
  37                                 const char *sharename,
  38                                 char **pp_newserver,
  39                                 char **pp_newshare,
  40                                 bool force_encrypt,
  41                                 const char *username,
  42                                 const char *password,
  43                                 const char *domain);
  44
  45 /********************************************************************
  46  Ensure a connection is encrypted.
  47 ********************************************************************/
  48
  49 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  50                         const char *username,
  51                         const char *password,
  52                         const char *domain,
  53                         const char *sharename)
  54 {
  55         NTSTATUS status = cli_force_encryption(c,
  56                                         username,
  57                                         password,
  58                                         domain);
  59
  60         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  61                 d_printf("Encryption required and "
  62                         "server that doesn't support "
  63                         "UNIX extensions - failing connect\n");
  64         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  65                 d_printf("Encryption required and "
  66                         "can't get UNIX CIFS extensions "
  67                         "version from server.\n");
  68         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  69                 d_printf("Encryption required and "
  70                         "share %s doesn't support "
  71                         "encryption.\n", sharename);
  72         } else if (!NT_STATUS_IS_OK(status)) {
  73                 d_printf("Encryption required and "
  74                         "setup failed with error %s.\n",
  75                         nt_errstr(status));
  76         }
  77
  78         return status;
  79 }
  80
  81 /********************************************************************
  82  Return a connection to a server.
  83 ********************************************************************/
  84
  85 static struct cli_state *do_connect(TALLOC_CTX *ctx,
  86                                         const char *server,
  87                                         const char *share,
  88                                         const struct user_auth_info *auth_info,
  89                                         bool show_sessetup,
  90                                         bool force_encrypt,
  91                                         int max_protocol,
  92                                         int port,
  93                                         int name_type)
  94 {
  95         struct cli_state *c = NULL;
  96         struct nmb_name called, calling;
  97         const char *server_n;
  98         struct sockaddr_storage ss;
  99         char *servicename;
 100         char *sharename;
 101         char *newserver, *newshare;
 102         const char *username;
 103         const char *password;
 104         NTSTATUS status;
 105
 106         /* make a copy so we don't modify the global string 'service' */
 107         servicename = talloc_strdup(ctx,share);
 108         if (!servicename) {
 109                 return NULL;
 110         }
 111         sharename = servicename;
 112         if (*sharename == '\\') {
 113                 sharename += 2;
 114                 if (server == NULL) {
 115                         server = sharename;
 116                 }
 117                 sharename = strchr_m(sharename,'\\');
 118                 if (!sharename) {
 119                         return NULL;
 120                 }
 121                 *sharename = 0;
 122                 sharename++;
 123         }
 124
 125         server_n = server;
 126
 127         zero_sockaddr(&ss);
 128
 129         make_nmb_name(&calling, global_myname(), 0x0);
 130         make_nmb_name(&called , server, name_type);
 131
 132  again:
 133         zero_sockaddr(&ss);
 134
 135         /* have to open a new connection */
 136         if (!(c=cli_initialise_ex(get_cmdline_auth_info_signing_state(auth_info)))) {
 137                 d_printf("Connection to %s failed\n", server_n);
 138                 if (c) {
 139                         cli_shutdown(c);
 140                 }
 141                 return NULL;
 142         }
 143         if (port) {
 144                 cli_set_port(c, port);
 145         }
 146
 147         status = cli_connect(c, server_n, &ss);
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 d_printf("Connection to %s failed (Error %s)\n",
 150                                 server_n,
 151                                 nt_errstr(status));
 152                 cli_shutdown(c);
 153                 return NULL;
 154         }
 155
 156         if (max_protocol == 0) {
 157                 max_protocol = PROTOCOL_NT1;
 158         }
 159         c->protocol = max_protocol;
 160         c->use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 161         c->fallback_after_kerberos =
 162                 get_cmdline_auth_info_fallback_after_kerberos(auth_info);
 163
 164         if (!cli_session_request(c, &calling, &called)) {
 165                 char *p;
 166                 d_printf("session request to %s failed (%s)\n",
 167                          called.name, cli_errstr(c));
 168                 cli_shutdown(c);
 169                 c = NULL;
 170                 if ((p=strchr_m(called.name, '.'))) {
 171                         *p = 0;
 172                         goto again;
 173                 }
 174                 if (strcmp(called.name, "*SMBSERVER")) {
 175                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 176                         goto again;
 177                 }
 178                 return NULL;
 179         }
 180
 181         DEBUG(4,(" session request ok\n"));
 182
 183         status = cli_negprot(c);
 184
 185         if (!NT_STATUS_IS_OK(status)) {
 186                 d_printf("protocol negotiation failed: %s\n",
 187                          nt_errstr(status));
 188                 cli_shutdown(c);
 189                 return NULL;
 190         }
 191
 192         username = get_cmdline_auth_info_username(auth_info);
 193         password = get_cmdline_auth_info_password(auth_info);
 194
 195         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 196                                                password, strlen(password),
 197                                                password, strlen(password),
 198                                                lp_workgroup()))) {
 199                 /* If a password was not supplied then
 200                  * try again with a null username. */
 201                 if (password[0] || !username[0] ||
 202                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 203                         !NT_STATUS_IS_OK(cli_session_setup(c, "",
 204                                                 "", 0,
 205                                                 "", 0,
 206                                                lp_workgroup()))) {
 207                         d_printf("session setup failed: %s\n", cli_errstr(c));
 208                         if (NT_STATUS_V(cli_nt_error(c)) ==
 209                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 210                                 d_printf("did you forget to run kinit?\n");
 211                         cli_shutdown(c);
 212                         return NULL;
 213                 }
 214                 d_printf("Anonymous login successful\n");
 215         }
 216
 217         if ( show_sessetup ) {
 218                 if (*c->server_domain) {
 219                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 220                                 c->server_domain,c->server_os,c->server_type));
 221                 } else if (*c->server_os || *c->server_type) {
 222                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 223                                  c->server_os,c->server_type));
 224                 }
 225         }
 226         DEBUG(4,(" session setup ok\n"));
 227
 228         /* here's the fun part....to support 'msdfs proxy' shares
 229            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 230            here before trying to connect to the original share.
 231            check_dfs_proxy() will fail if it is a normal share. */
 232
 233         if ((c->capabilities & CAP_DFS) &&
 234                         cli_check_msdfs_proxy(ctx, c, sharename,
 235                                 &newserver, &newshare,
 236                                 force_encrypt,
 237                                 username,
 238                                 password,
 239                                 lp_workgroup())) {
 240                 cli_shutdown(c);
 241                 return do_connect(ctx, newserver,
 242                                 newshare, auth_info, false,
 243                                 force_encrypt, max_protocol,
 244                                 port, name_type);
 245         }
 246
 247         /* must be a normal share */
 248
 249         status = cli_tcon_andx(c, sharename, "?????",
 250                                password, strlen(password)+1);
 251         if (!NT_STATUS_IS_OK(status)) {
 252                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 253                 cli_shutdown(c);
 254                 return NULL;
 255         }
 256
 257         if (force_encrypt) {
 258                 status = cli_cm_force_encryption(c,
 259                                         username,
 260                                         password,
 261                                         lp_workgroup(),
 262                                         sharename);
 263                 if (!NT_STATUS_IS_OK(status)) {
 264                         cli_shutdown(c);
 265                         return NULL;
 266                 }
 267         }
 268
 269         DEBUG(4,(" tconx ok\n"));
 270         return c;
 271 }
 272
 273 /****************************************************************************
 274 ****************************************************************************/
 275
 276 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 277 {
 278         char *name = clean_name(NULL, mnt);
 279         if (!name) {
 280                 return;
 281         }
 282         TALLOC_FREE(cli->dfs_mountpoint);
 283         cli->dfs_mountpoint = talloc_strdup(cli, name);
 284         TALLOC_FREE(name);
 285 }
 286
 287 /********************************************************************
 288  Add a new connection to the list.
 289  referring_cli == NULL means a new initial connection.
 290 ********************************************************************/
 291
 292 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 293                                         struct cli_state *referring_cli,
 294                                         const char *server,
 295                                         const char *share,
 296                                         const struct user_auth_info *auth_info,
 297                                         bool show_hdr,
 298                                         bool force_encrypt,
 299                                         int max_protocol,
 300                                         int port,
 301                                         int name_type)
 302 {
 303         struct cli_state *cli;
 304
 305         cli = do_connect(ctx, server, share,
 306                                 auth_info,
 307                                 show_hdr, force_encrypt, max_protocol,
 308                                 port, name_type);
 309
 310         if (!cli ) {
 311                 return NULL;
 312         }
 313
 314         /* Enter into the list. */
 315         if (referring_cli) {
 316                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 317         }
 318
 319         if (referring_cli && referring_cli->posix_capabilities) {
 320                 uint16 major, minor;
 321                 uint32 caplow, caphigh;
 322                 if (cli_unix_extensions_version(cli, &major,
 323                                         &minor, &caplow, &caphigh)) {
 324                         cli_set_unix_extensions_capabilities(cli,
 325                                         major, minor,
 326                                         caplow, caphigh);
 327                 }
 328         }
 329
 330         return cli;
 331 }
 332
 333 /********************************************************************
 334  Return a connection to a server on a particular share.
 335 ********************************************************************/
 336
 337 static struct cli_state *cli_cm_find(struct cli_state *cli,
 338                                 const char *server,
 339                                 const char *share)
 340 {
 341         struct cli_state *p;
 342
 343         if (cli == NULL) {
 344                 return NULL;
 345         }
 346
 347         /* Search to the start of the list. */
 348         for (p = cli; p; p = p->prev) {
 349                 if (strequal(server, p->desthost) &&
 350                                 strequal(share,p->share)) {
 351                         return p;
 352                 }
 353         }
 354
 355         /* Search to the end of the list. */
 356         for (p = cli->next; p; p = p->next) {
 357                 if (strequal(server, p->desthost) &&
 358                                 strequal(share,p->share)) {
 359                         return p;
 360                 }
 361         }
 362
 363         return NULL;
 364 }
 365
 366 /****************************************************************************
 367  Open a client connection to a \\server\share.
 368 ****************************************************************************/
 369
 370 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 371                                 struct cli_state *referring_cli,
 372                                 const char *server,
 373                                 const char *share,
 374                                 const struct user_auth_info *auth_info,
 375                                 bool show_hdr,
 376                                 bool force_encrypt,
 377                                 int max_protocol,
 378                                 int port,
 379                                 int name_type)
 380 {
 381         /* Try to reuse an existing connection in this list. */
 382         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 383
 384         if (c) {
 385                 return c;
 386         }
 387
 388         if (auth_info == NULL) {
 389                 /* Can't do a new connection
 390                  * without auth info. */
 391                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 392                         "without auth info\n",
 393                         server, share );
 394                 return NULL;
 395         }
 396
 397         return cli_cm_connect(ctx,
 398                                 referring_cli,
 399                                 server,
 400                                 share,
 401                                 auth_info,
 402                                 show_hdr,
 403                                 force_encrypt,
 404                                 max_protocol,
 405                                 port,
 406                                 name_type);
 407 }
 408
 409 /****************************************************************************
 410 ****************************************************************************/
 411
 412 void cli_cm_display(const struct cli_state *cli)
 413 {
 414         int i;
 415
 416         for (i=0; cli; cli = cli->next,i++ ) {
 417                 d_printf("%d:\tserver=%s, share=%s\n",
 418                         i, cli->desthost, cli->share );
 419         }
 420 }
 421
 422 /****************************************************************************
 423 ****************************************************************************/
 424
 425 /****************************************************************************
 426 ****************************************************************************/
 427
 428 #if 0
 429 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 430 {
 431         SAFE_FREE(cm_creds.username);
 432         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 433                                                auth_info));
 434
 435         if (get_cmdline_auth_info_got_pass(auth_info)) {
 436                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 437         }
 438
 439         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 440         cm_creds.fallback_after_kerberos = false;
 441         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 442 }
 443 #endif
 444
 445 /**********************************************************************
 446  split a dfs path into the server, share name, and extrapath components
 447 **********************************************************************/
 448
 449 static void split_dfs_path(TALLOC_CTX *ctx,
 450                                 const char *nodepath,
 451                                 char **pp_server,
 452                                 char **pp_share,
 453                                 char **pp_extrapath)
 454 {
 455         char *p, *q;
 456         char *path;
 457
 458         *pp_server = NULL;
 459         *pp_share = NULL;
 460         *pp_extrapath = NULL;
 461
 462         path = talloc_strdup(ctx, nodepath);
 463         if (!path) {
 464                 return;
 465         }
 466
 467         if ( path[0] != '\\' ) {
 468                 return;
 469         }
 470
 471         p = strchr_m( path + 1, '\\' );
 472         if ( !p ) {
 473                 return;
 474         }
 475
 476         *p = '\0';
 477         p++;
 478
 479         /* Look for any extra/deep path */
 480         q = strchr_m(p, '\\');
 481         if (q != NULL) {
 482                 *q = '\0';
 483                 q++;
 484                 *pp_extrapath = talloc_strdup(ctx, q);
 485         } else {
 486                 *pp_extrapath = talloc_strdup(ctx, "");
 487         }
 488
 489         *pp_share = talloc_strdup(ctx, p);
 490         *pp_server = talloc_strdup(ctx, &path[1]);
 491 }
 492
 493 /****************************************************************************
 494  Return the original path truncated at the directory component before
 495  the first wildcard character. Trust the caller to provide a NULL
 496  terminated string
 497 ****************************************************************************/
 498
 499 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 500 {
 501         size_t len;
 502         char *p1, *p2, *p;
 503         char *path_out;
 504
 505         /* No absolute paths. */
 506         while (IS_DIRECTORY_SEP(*path)) {
 507                 path++;
 508         }
 509
 510         path_out = talloc_strdup(ctx, path);
 511         if (!path_out) {
 512                 return NULL;
 513         }
 514
 515         p1 = strchr_m(path_out, '*');
 516         p2 = strchr_m(path_out, '?');
 517
 518         if (p1 || p2) {
 519                 if (p1 && p2) {
 520                         p = MIN(p1,p2);
 521                 } else if (!p1) {
 522                         p = p2;
 523                 } else {
 524                         p = p1;
 525                 }
 526                 *p = '\0';
 527
 528                 /* Now go back to the start of this component. */
 529                 p1 = strrchr_m(path_out, '/');
 530                 p2 = strrchr_m(path_out, '\\');
 531                 p = MAX(p1,p2);
 532                 if (p) {
 533                         *p = '\0';
 534                 }
 535         }
 536
 537         /* Strip any trailing separator */
 538
 539         len = strlen(path_out);
 540         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 541                 path_out[len-1] = '\0';
 542         }
 543
 544         return path_out;
 545 }
 546
 547 /****************************************************************************
 548 ****************************************************************************/
 549
 550 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 551                                         struct cli_state *cli,
 552                                         const char *dir)
 553 {
 554         /* Ensure the extrapath doesn't start with a separator. */
 555         while (IS_DIRECTORY_SEP(*dir)) {
 556                 dir++;
 557         }
 558
 559         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 560                         cli->desthost, cli->share, dir);
 561 }
 562
 563 /********************************************************************
 564  check for dfs referral
 565 ********************************************************************/
 566
 567 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 568 {
 569         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 570
 571         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 572
 573         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 574                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 575                 return false;
 576
 577         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 578                 return true;
 579
 580         return false;
 581 }
 582
 583 /********************************************************************
 584  Get the dfs referral link.
 585 ********************************************************************/
 586
 587 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 588                         struct cli_state *cli,
 589                         const char *path,
 590                         CLIENT_DFS_REFERRAL**refs,
 591                         size_t *num_refs,
 592                         uint16 *consumed)
 593 {
 594         unsigned int data_len = 0;
 595         unsigned int param_len = 0;
 596         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 597         char *param;
 598         char *rparam=NULL, *rdata=NULL;
 599         char *p;
 600         char *endp;
 601         size_t pathlen = 2*(strlen(path)+1);
 602         uint16 num_referrals;
 603         CLIENT_DFS_REFERRAL *referrals = NULL;
 604         bool ret = false;
 605
 606         *num_refs = 0;
 607         *refs = NULL;
 608
 609         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 610         if (!param) {
 611                 return false;
 612         }
 613         SSVAL(param, 0, 0x03);  /* max referral level */
 614         p = &param[2];
 615
 616         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 617         param_len = PTR_DIFF(p, param);
 618
 619         if (!cli_send_trans(cli, SMBtrans2,
 620                         NULL,                        /* name */
 621                         -1, 0,                          /* fid, flags */
 622                         &setup, 1, 0,                   /* setup, length, max */
 623                         param, param_len, 2,            /* param, length, max */
 624                         NULL, 0, cli->max_xmit /* data, length, max */
 625                         )) {
 626                 SAFE_FREE(param);
 627                 return false;
 628         }
 629
 630         SAFE_FREE(param);
 631
 632         if (!cli_receive_trans(cli, SMBtrans2,
 633                 &rparam, &param_len,
 634                 &rdata, &data_len)) {
 635                         return false;
 636         }
 637
 638         if (data_len < 4) {
 639                 goto out;
 640         }
 641
 642         endp = rdata + data_len;
 643
 644         *consumed     = SVAL(rdata, 0);
 645         num_referrals = SVAL(rdata, 2);
 646
 647         if (num_referrals != 0) {
 648                 uint16 ref_version;
 649                 uint16 ref_size;
 650                 int i;
 651                 uint16 node_offset;
 652
 653                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 654                                 num_referrals);
 655
 656                 if (!referrals) {
 657                         goto out;
 658                 }
 659                 /* start at the referrals array */
 660
 661                 p = rdata+8;
 662                 for (i=0; i<num_referrals && p < endp; i++) {
 663                         if (p + 18 > endp) {
 664                                 goto out;
 665                         }
 666                         ref_version = SVAL(p, 0);
 667                         ref_size    = SVAL(p, 2);
 668                         node_offset = SVAL(p, 16);
 669
 670                         if (ref_version != 3) {
 671                                 p += ref_size;
 672                                 continue;
 673                         }
 674
 675                         referrals[i].proximity = SVAL(p, 8);
 676                         referrals[i].ttl       = SVAL(p, 10);
 677
 678                         if (p + node_offset > endp) {
 679                                 goto out;
 680                         }
 681                         clistr_pull_talloc(ctx, cli->inbuf,
 682                                            &referrals[i].dfspath,
 683                                            p+node_offset, -1,
 684                                            STR_TERMINATE|STR_UNICODE);
 685
 686                         if (!referrals[i].dfspath) {
 687                                 goto out;
 688                         }
 689                         p += ref_size;
 690                 }
 691                 if (i < num_referrals) {
 692                         goto out;
 693                 }
 694         }
 695
 696         ret = true;
 697
 698         *num_refs = num_referrals;
 699         *refs = referrals;
 700
 701   out:
 702
 703         SAFE_FREE(rdata);
 704         SAFE_FREE(rparam);
 705         return ret;
 706 }
 707
 708 /********************************************************************
 709 ********************************************************************/
 710
 711 bool cli_resolve_path(TALLOC_CTX *ctx,
 712                         const char *mountpt,
 713                         const struct user_auth_info *dfs_auth_info,
 714                         struct cli_state *rootcli,
 715                         const char *path,
 716                         struct cli_state **targetcli,
 717                         char **pp_targetpath)
 718 {
 719         CLIENT_DFS_REFERRAL *refs = NULL;
 720         size_t num_refs = 0;
 721         uint16 consumed;
 722         struct cli_state *cli_ipc = NULL;
 723         char *dfs_path = NULL;
 724         char *cleanpath = NULL;
 725         char *extrapath = NULL;
 726         int pathlen;
 727         char *server = NULL;
 728         char *share = NULL;
 729         struct cli_state *newcli = NULL;
 730         char *newpath = NULL;
 731         char *newmount = NULL;
 732         char *ppath = NULL;
 733         SMB_STRUCT_STAT sbuf;
 734         uint32 attributes;
 735
 736         if ( !rootcli || !path || !targetcli ) {
 737                 return false;
 738         }
 739
 740         /* Don't do anything if this is not a DFS root. */
 741
 742         if ( !rootcli->dfsroot) {
 743                 *targetcli = rootcli;
 744                 *pp_targetpath = talloc_strdup(ctx, path);
 745                 if (!*pp_targetpath) {
 746                         return false;
 747                 }
 748                 return true;
 749         }
 750
 751         *targetcli = NULL;
 752
 753         /* Send a trans2_query_path_info to check for a referral. */
 754
 755         cleanpath = clean_path(ctx, path);
 756         if (!cleanpath) {
 757                 return false;
 758         }
 759
 760         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 761         if (!dfs_path) {
 762                 return false;
 763         }
 764
 765         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 766                 /* This is an ordinary path, just return it. */
 767                 *targetcli = rootcli;
 768                 *pp_targetpath = talloc_strdup(ctx, path);
 769                 if (!*pp_targetpath) {
 770                         return false;
 771                 }
 772                 goto done;
 773         }
 774
 775         /* Special case where client asked for a path that does not exist */
 776
 777         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 778                 *targetcli = rootcli;
 779                 *pp_targetpath = talloc_strdup(ctx, path);
 780                 if (!*pp_targetpath) {
 781                         return false;
 782                 }
 783                 goto done;
 784         }
 785
 786         /* We got an error, check for DFS referral. */
 787
 788         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 789                 return false;
 790         }
 791
 792         /* Check for the referral. */
 793
 794         if (!(cli_ipc = cli_cm_open(ctx,
 795                                 rootcli,
 796                                 rootcli->desthost,
 797                                 "IPC$",
 798                                 dfs_auth_info,
 799                                 false,
 800                                 (rootcli->trans_enc_state != NULL),
 801                                 rootcli->protocol,
 802                                 0,
 803                                 0x20))) {
 804                 return false;
 805         }
 806
 807         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 808                         &num_refs, &consumed) || !num_refs) {
 809                 return false;
 810         }
 811
 812         /* Just store the first referral for now. */
 813
 814         if (!refs[0].dfspath) {
 815                 return false;
 816         }
 817         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 818
 819         if (!server || !share) {
 820                 return false;
 821         }
 822
 823         /* Make sure to recreate the original string including any wildcards. */
 824
 825         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 826         if (!dfs_path) {
 827                 return false;
 828         }
 829         pathlen = strlen(dfs_path)*2;
 830         consumed = MIN(pathlen, consumed);
 831         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 832         if (!*pp_targetpath) {
 833                 return false;
 834         }
 835         dfs_path[consumed/2] = '\0';
 836
 837         /*
 838          * *pp_targetpath is now the unconsumed part of the path.
 839          * dfs_path is now the consumed part of the path
 840          * (in \server\share\path format).
 841          */
 842
 843         /* Open the connection to the target server & share */
 844         if ((*targetcli = cli_cm_open(ctx, rootcli,
 845                                         server,
 846                                         share,
 847                                         dfs_auth_info,
 848                                         false,
 849                                         (rootcli->trans_enc_state != NULL),
 850                                         rootcli->protocol,
 851                                         0,
 852                                         0x20)) == NULL) {
 853                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 854                         server, share );
 855                 return false;
 856         }
 857
 858         if (extrapath && strlen(extrapath) > 0) {
 859                 *pp_targetpath = talloc_asprintf(ctx,
 860                                                 "%s%s",
 861                                                 extrapath,
 862                                                 *pp_targetpath);
 863                 if (!*pp_targetpath) {
 864                         return false;
 865                 }
 866         }
 867
 868         /* parse out the consumed mount path */
 869         /* trim off the \server\share\ */
 870
 871         ppath = dfs_path;
 872
 873         if (*ppath != '\\') {
 874                 d_printf("cli_resolve_path: "
 875                         "dfs_path (%s) not in correct format.\n",
 876                         dfs_path );
 877                 return false;
 878         }
 879
 880         ppath++; /* Now pointing at start of server name. */
 881
 882         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 883                 return false;
 884         }
 885
 886         ppath++; /* Now pointing at start of share name. */
 887
 888         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 889                 return false;
 890         }
 891
 892         ppath++; /* Now pointing at path component. */
 893
 894         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 895         if (!newmount) {
 896                 return false;
 897         }
 898
 899         cli_set_mntpoint(*targetcli, newmount);
 900
 901         /* Check for another dfs referral, note that we are not
 902            checking for loops here. */
 903
 904         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 905                 if (cli_resolve_path(ctx,
 906                                         newmount,
 907                                         dfs_auth_info,
 908                                         *targetcli,
 909                                         *pp_targetpath,
 910                                         &newcli,
 911                                         &newpath)) {
 912                         /*
 913                          * When cli_resolve_path returns true here it's always
 914                          * returning the complete path in newpath, so we're done
 915                          * here.
 916                          */
 917                         *targetcli = newcli;
 918                         *pp_targetpath = newpath;
 919                         return true;
 920                 }
 921         }
 922
 923   done:
 924
 925         /* If returning true ensure we return a dfs root full path. */
 926         if ((*targetcli)->dfsroot) {
 927                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 928                 if (!dfs_path) {
 929                         return false;
 930                 }
 931                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 932         }
 933
 934         return true;
 935 }
 936
 937 /********************************************************************
 938 ********************************************************************/
 939
 940 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 941                                 struct cli_state *cli,
 942                                 const char *sharename,
 943                                 char **pp_newserver,
 944                                 char **pp_newshare,
 945                                 bool force_encrypt,
 946                                 const char *username,
 947                                 const char *password,
 948                                 const char *domain)
 949 {
 950         CLIENT_DFS_REFERRAL *refs = NULL;
 951         size_t num_refs = 0;
 952         uint16 consumed;
 953         char *fullpath = NULL;
 954         bool res;
 955         uint16 cnum;
 956         char *newextrapath = NULL;
 957
 958         if (!cli || !sharename) {
 959                 return false;
 960         }
 961
 962         cnum = cli->cnum;
 963
 964         /* special case.  never check for a referral on the IPC$ share */
 965
 966         if (strequal(sharename, "IPC$")) {
 967                 return false;
 968         }
 969
 970         /* send a trans2_query_path_info to check for a referral */
 971
 972         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
 973         if (!fullpath) {
 974                 return false;
 975         }
 976
 977         /* check for the referral */
 978
 979         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
 980                 return false;
 981         }
 982
 983         if (force_encrypt) {
 984                 NTSTATUS status = cli_cm_force_encryption(cli,
 985                                         username,
 986                                         password,
 987                                         lp_workgroup(),
 988                                         "IPC$");
 989                 if (!NT_STATUS_IS_OK(status)) {
 990                         return false;
 991                 }
 992         }
 993
 994         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
 995
 996         if (!cli_tdis(cli)) {
 997                 return false;
 998         }
 999
1000         cli->cnum = cnum;
1001
1002         if (!res || !num_refs) {
1003                 return false;
1004         }
1005
1006         if (!refs[0].dfspath) {
1007                 return false;
1008         }
1009
1010         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1011                         pp_newshare, &newextrapath );
1012
1013         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1014                 return false;
1015         }
1016
1017         /* check that this is not a self-referral */
1018
1019         if (strequal(cli->desthost, *pp_newserver) &&
1020                         strequal(sharename, *pp_newshare)) {
1021                 return false;
1022         }
1023
1024         return true;
1025 }