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 *called_str;
  98         const char *server_n;
  99         struct sockaddr_storage ss;
 100         char *servicename;
 101         char *sharename;
 102         char *newserver, *newshare;
 103         const char *username;
 104         const char *password;
 105         NTSTATUS status;
 106
 107         /* make a copy so we don't modify the global string 'service' */
 108         servicename = talloc_strdup(ctx,share);
 109         if (!servicename) {
 110                 return NULL;
 111         }
 112         sharename = servicename;
 113         if (*sharename == '\\') {
 114                 sharename += 2;
 115                 called_str = sharename;
 116                 if (server == NULL) {
 117                         server = sharename;
 118                 }
 119                 sharename = strchr_m(sharename,'\\');
 120                 if (!sharename) {
 121                         return NULL;
 122                 }
 123                 *sharename = 0;
 124                 sharename++;
 125         } else {
 126                 called_str = server;
 127         }
 128
 129         server_n = server;
 130
 131         zero_sockaddr(&ss);
 132
 133         make_nmb_name(&calling, global_myname(), 0x0);
 134         make_nmb_name(&called , called_str, name_type);
 135
 136  again:
 137         zero_sockaddr(&ss);
 138
 139         /* have to open a new connection */
 140         if (!(c=cli_initialise_ex(get_cmdline_auth_info_signing_state(auth_info)))) {
 141                 d_printf("Connection to %s failed\n", server_n);
 142                 if (c) {
 143                         cli_shutdown(c);
 144                 }
 145                 return NULL;
 146         }
 147         if (port) {
 148                 cli_set_port(c, port);
 149         }
 150
 151         status = cli_connect(c, server_n, &ss);
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 d_printf("Connection to %s failed (Error %s)\n",
 154                                 server_n,
 155                                 nt_errstr(status));
 156                 cli_shutdown(c);
 157                 return NULL;
 158         }
 159
 160         if (max_protocol == 0) {
 161                 max_protocol = PROTOCOL_NT1;
 162         }
 163         c->protocol = max_protocol;
 164         c->use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 165         c->fallback_after_kerberos =
 166                 get_cmdline_auth_info_fallback_after_kerberos(auth_info);
 167
 168         if (!cli_session_request(c, &calling, &called)) {
 169                 char *p;
 170                 d_printf("session request to %s failed (%s)\n",
 171                          called.name, cli_errstr(c));
 172                 cli_shutdown(c);
 173                 c = NULL;
 174                 if ((p=strchr_m(called.name, '.'))) {
 175                         *p = 0;
 176                         goto again;
 177                 }
 178                 if (strcmp(called.name, "*SMBSERVER")) {
 179                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 180                         goto again;
 181                 }
 182                 return NULL;
 183         }
 184
 185         DEBUG(4,(" session request ok\n"));
 186
 187         status = cli_negprot(c);
 188
 189         if (!NT_STATUS_IS_OK(status)) {
 190                 d_printf("protocol negotiation failed: %s\n",
 191                          nt_errstr(status));
 192                 cli_shutdown(c);
 193                 return NULL;
 194         }
 195
 196         username = get_cmdline_auth_info_username(auth_info);
 197         password = get_cmdline_auth_info_password(auth_info);
 198
 199         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 200                                                password, strlen(password),
 201                                                password, strlen(password),
 202                                                lp_workgroup()))) {
 203                 /* If a password was not supplied then
 204                  * try again with a null username. */
 205                 if (password[0] || !username[0] ||
 206                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 207                         !NT_STATUS_IS_OK(cli_session_setup(c, "",
 208                                                 "", 0,
 209                                                 "", 0,
 210                                                lp_workgroup()))) {
 211                         d_printf("session setup failed: %s\n", cli_errstr(c));
 212                         if (NT_STATUS_V(cli_nt_error(c)) ==
 213                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 214                                 d_printf("did you forget to run kinit?\n");
 215                         cli_shutdown(c);
 216                         return NULL;
 217                 }
 218                 d_printf("Anonymous login successful\n");
 219         }
 220
 221         if ( show_sessetup ) {
 222                 if (*c->server_domain) {
 223                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 224                                 c->server_domain,c->server_os,c->server_type));
 225                 } else if (*c->server_os || *c->server_type) {
 226                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 227                                  c->server_os,c->server_type));
 228                 }
 229         }
 230         DEBUG(4,(" session setup ok\n"));
 231
 232         /* here's the fun part....to support 'msdfs proxy' shares
 233            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 234            here before trying to connect to the original share.
 235            check_dfs_proxy() will fail if it is a normal share. */
 236
 237         if ((c->capabilities & CAP_DFS) &&
 238                         cli_check_msdfs_proxy(ctx, c, sharename,
 239                                 &newserver, &newshare,
 240                                 force_encrypt,
 241                                 username,
 242                                 password,
 243                                 lp_workgroup())) {
 244                 cli_shutdown(c);
 245                 return do_connect(ctx, newserver,
 246                                 newshare, auth_info, false,
 247                                 force_encrypt, max_protocol,
 248                                 port, name_type);
 249         }
 250
 251         /* must be a normal share */
 252
 253         status = cli_tcon_andx(c, sharename, "?????",
 254                                password, strlen(password)+1);
 255         if (!NT_STATUS_IS_OK(status)) {
 256                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 257                 cli_shutdown(c);
 258                 return NULL;
 259         }
 260
 261         if (force_encrypt) {
 262                 status = cli_cm_force_encryption(c,
 263                                         username,
 264                                         password,
 265                                         lp_workgroup(),
 266                                         sharename);
 267                 if (!NT_STATUS_IS_OK(status)) {
 268                         cli_shutdown(c);
 269                         return NULL;
 270                 }
 271         }
 272
 273         DEBUG(4,(" tconx ok\n"));
 274         return c;
 275 }
 276
 277 /****************************************************************************
 278 ****************************************************************************/
 279
 280 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 281 {
 282         char *name = clean_name(NULL, mnt);
 283         if (!name) {
 284                 return;
 285         }
 286         TALLOC_FREE(cli->dfs_mountpoint);
 287         cli->dfs_mountpoint = talloc_strdup(cli, name);
 288         TALLOC_FREE(name);
 289 }
 290
 291 /********************************************************************
 292  Add a new connection to the list.
 293  referring_cli == NULL means a new initial connection.
 294 ********************************************************************/
 295
 296 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 297                                         struct cli_state *referring_cli,
 298                                         const char *server,
 299                                         const char *share,
 300                                         const struct user_auth_info *auth_info,
 301                                         bool show_hdr,
 302                                         bool force_encrypt,
 303                                         int max_protocol,
 304                                         int port,
 305                                         int name_type)
 306 {
 307         struct cli_state *cli;
 308
 309         cli = do_connect(ctx, server, share,
 310                                 auth_info,
 311                                 show_hdr, force_encrypt, max_protocol,
 312                                 port, name_type);
 313
 314         if (!cli ) {
 315                 return NULL;
 316         }
 317
 318         /* Enter into the list. */
 319         if (referring_cli) {
 320                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 321         }
 322
 323         if (referring_cli && referring_cli->posix_capabilities) {
 324                 uint16 major, minor;
 325                 uint32 caplow, caphigh;
 326                 if (cli_unix_extensions_version(cli, &major,
 327                                         &minor, &caplow, &caphigh)) {
 328                         cli_set_unix_extensions_capabilities(cli,
 329                                         major, minor,
 330                                         caplow, caphigh);
 331                 }
 332         }
 333
 334         return cli;
 335 }
 336
 337 /********************************************************************
 338  Return a connection to a server on a particular share.
 339 ********************************************************************/
 340
 341 static struct cli_state *cli_cm_find(struct cli_state *cli,
 342                                 const char *server,
 343                                 const char *share)
 344 {
 345         struct cli_state *p;
 346
 347         if (cli == NULL) {
 348                 return NULL;
 349         }
 350
 351         /* Search to the start of the list. */
 352         for (p = cli; p; p = p->prev) {
 353                 if (strequal(server, p->desthost) &&
 354                                 strequal(share,p->share)) {
 355                         return p;
 356                 }
 357         }
 358
 359         /* Search to the end of the list. */
 360         for (p = cli->next; p; p = p->next) {
 361                 if (strequal(server, p->desthost) &&
 362                                 strequal(share,p->share)) {
 363                         return p;
 364                 }
 365         }
 366
 367         return NULL;
 368 }
 369
 370 /****************************************************************************
 371  Open a client connection to a \\server\share.
 372 ****************************************************************************/
 373
 374 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 375                                 struct cli_state *referring_cli,
 376                                 const char *server,
 377                                 const char *share,
 378                                 const struct user_auth_info *auth_info,
 379                                 bool show_hdr,
 380                                 bool force_encrypt,
 381                                 int max_protocol,
 382                                 int port,
 383                                 int name_type)
 384 {
 385         /* Try to reuse an existing connection in this list. */
 386         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 387
 388         if (c) {
 389                 return c;
 390         }
 391
 392         if (auth_info == NULL) {
 393                 /* Can't do a new connection
 394                  * without auth info. */
 395                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 396                         "without auth info\n",
 397                         server, share );
 398                 return NULL;
 399         }
 400
 401         return cli_cm_connect(ctx,
 402                                 referring_cli,
 403                                 server,
 404                                 share,
 405                                 auth_info,
 406                                 show_hdr,
 407                                 force_encrypt,
 408                                 max_protocol,
 409                                 port,
 410                                 name_type);
 411 }
 412
 413 /****************************************************************************
 414 ****************************************************************************/
 415
 416 void cli_cm_display(const struct cli_state *cli)
 417 {
 418         int i;
 419
 420         for (i=0; cli; cli = cli->next,i++ ) {
 421                 d_printf("%d:\tserver=%s, share=%s\n",
 422                         i, cli->desthost, cli->share );
 423         }
 424 }
 425
 426 /****************************************************************************
 427 ****************************************************************************/
 428
 429 /****************************************************************************
 430 ****************************************************************************/
 431
 432 #if 0
 433 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 434 {
 435         SAFE_FREE(cm_creds.username);
 436         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 437                                                auth_info));
 438
 439         if (get_cmdline_auth_info_got_pass(auth_info)) {
 440                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 441         }
 442
 443         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 444         cm_creds.fallback_after_kerberos = false;
 445         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 446 }
 447 #endif
 448
 449 /**********************************************************************
 450  split a dfs path into the server, share name, and extrapath components
 451 **********************************************************************/
 452
 453 static void split_dfs_path(TALLOC_CTX *ctx,
 454                                 const char *nodepath,
 455                                 char **pp_server,
 456                                 char **pp_share,
 457                                 char **pp_extrapath)
 458 {
 459         char *p, *q;
 460         char *path;
 461
 462         *pp_server = NULL;
 463         *pp_share = NULL;
 464         *pp_extrapath = NULL;
 465
 466         path = talloc_strdup(ctx, nodepath);
 467         if (!path) {
 468                 return;
 469         }
 470
 471         if ( path[0] != '\\' ) {
 472                 return;
 473         }
 474
 475         p = strchr_m( path + 1, '\\' );
 476         if ( !p ) {
 477                 return;
 478         }
 479
 480         *p = '\0';
 481         p++;
 482
 483         /* Look for any extra/deep path */
 484         q = strchr_m(p, '\\');
 485         if (q != NULL) {
 486                 *q = '\0';
 487                 q++;
 488                 *pp_extrapath = talloc_strdup(ctx, q);
 489         } else {
 490                 *pp_extrapath = talloc_strdup(ctx, "");
 491         }
 492
 493         *pp_share = talloc_strdup(ctx, p);
 494         *pp_server = talloc_strdup(ctx, &path[1]);
 495 }
 496
 497 /****************************************************************************
 498  Return the original path truncated at the directory component before
 499  the first wildcard character. Trust the caller to provide a NULL
 500  terminated string
 501 ****************************************************************************/
 502
 503 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 504 {
 505         size_t len;
 506         char *p1, *p2, *p;
 507         char *path_out;
 508
 509         /* No absolute paths. */
 510         while (IS_DIRECTORY_SEP(*path)) {
 511                 path++;
 512         }
 513
 514         path_out = talloc_strdup(ctx, path);
 515         if (!path_out) {
 516                 return NULL;
 517         }
 518
 519         p1 = strchr_m(path_out, '*');
 520         p2 = strchr_m(path_out, '?');
 521
 522         if (p1 || p2) {
 523                 if (p1 && p2) {
 524                         p = MIN(p1,p2);
 525                 } else if (!p1) {
 526                         p = p2;
 527                 } else {
 528                         p = p1;
 529                 }
 530                 *p = '\0';
 531
 532                 /* Now go back to the start of this component. */
 533                 p1 = strrchr_m(path_out, '/');
 534                 p2 = strrchr_m(path_out, '\\');
 535                 p = MAX(p1,p2);
 536                 if (p) {
 537                         *p = '\0';
 538                 }
 539         }
 540
 541         /* Strip any trailing separator */
 542
 543         len = strlen(path_out);
 544         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 545                 path_out[len-1] = '\0';
 546         }
 547
 548         return path_out;
 549 }
 550
 551 /****************************************************************************
 552 ****************************************************************************/
 553
 554 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 555                                         struct cli_state *cli,
 556                                         const char *dir)
 557 {
 558         char path_sep = '\\';
 559
 560         /* Ensure the extrapath doesn't start with a separator. */
 561         while (IS_DIRECTORY_SEP(*dir)) {
 562                 dir++;
 563         }
 564
 565         if (cli->posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 566                 path_sep = '/';
 567         }
 568         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 569                         path_sep,
 570                         cli->desthost,
 571                         path_sep,
 572                         cli->share,
 573                         path_sep,
 574                         dir);
 575 }
 576
 577 /********************************************************************
 578  check for dfs referral
 579 ********************************************************************/
 580
 581 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 582 {
 583         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 584
 585         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 586
 587         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 588                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 589                 return false;
 590
 591         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 592                 return true;
 593
 594         return false;
 595 }
 596
 597 /********************************************************************
 598  Get the dfs referral link.
 599 ********************************************************************/
 600
 601 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 602                         struct cli_state *cli,
 603                         const char *path,
 604                         CLIENT_DFS_REFERRAL**refs,
 605                         size_t *num_refs,
 606                         size_t *consumed)
 607 {
 608         unsigned int data_len = 0;
 609         unsigned int param_len = 0;
 610         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 611         char *param = NULL;
 612         char *rparam=NULL, *rdata=NULL;
 613         char *p;
 614         char *endp;
 615         size_t pathlen = 2*(strlen(path)+1);
 616         smb_ucs2_t *path_ucs;
 617         char *consumed_path = NULL;
 618         uint16_t consumed_ucs;
 619         uint16 num_referrals;
 620         CLIENT_DFS_REFERRAL *referrals = NULL;
 621         bool ret = false;
 622
 623         *num_refs = 0;
 624         *refs = NULL;
 625
 626         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 627         if (!param) {
 628                 goto out;
 629         }
 630         SSVAL(param, 0, 0x03);  /* max referral level */
 631         p = &param[2];
 632
 633         path_ucs = (smb_ucs2_t *)p;
 634         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 635         param_len = PTR_DIFF(p, param);
 636
 637         if (!cli_send_trans(cli, SMBtrans2,
 638                         NULL,                        /* name */
 639                         -1, 0,                          /* fid, flags */
 640                         &setup, 1, 0,                   /* setup, length, max */
 641                         param, param_len, 2,            /* param, length, max */
 642                         NULL, 0, cli->max_xmit /* data, length, max */
 643                         )) {
 644                 goto out;
 645         }
 646
 647         if (!cli_receive_trans(cli, SMBtrans2,
 648                 &rparam, &param_len,
 649                 &rdata, &data_len)) {
 650                 goto out;
 651         }
 652
 653         if (data_len < 4) {
 654                 goto out;
 655         }
 656
 657         endp = rdata + data_len;
 658
 659         consumed_ucs  = SVAL(rdata, 0);
 660         num_referrals = SVAL(rdata, 2);
 661
 662         /* consumed_ucs is the number of bytes
 663          * of the UCS2 path consumed not counting any
 664          * terminating null. We need to convert
 665          * back to unix charset and count again
 666          * to get the number of bytes consumed from
 667          * the incoming path. */
 668
 669         if (pull_string_talloc(talloc_tos(),
 670                         NULL,
 671                         0,
 672                         &consumed_path,
 673                         path_ucs,
 674                         consumed_ucs,
 675                         STR_UNICODE) == 0) {
 676                 goto out;
 677         }
 678         if (consumed_path == NULL) {
 679                 goto out;
 680         }
 681         *consumed = strlen(consumed_path);
 682
 683         if (num_referrals != 0) {
 684                 uint16 ref_version;
 685                 uint16 ref_size;
 686                 int i;
 687                 uint16 node_offset;
 688
 689                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 690                                 num_referrals);
 691
 692                 if (!referrals) {
 693                         goto out;
 694                 }
 695                 /* start at the referrals array */
 696
 697                 p = rdata+8;
 698                 for (i=0; i<num_referrals && p < endp; i++) {
 699                         if (p + 18 > endp) {
 700                                 goto out;
 701                         }
 702                         ref_version = SVAL(p, 0);
 703                         ref_size    = SVAL(p, 2);
 704                         node_offset = SVAL(p, 16);
 705
 706                         if (ref_version != 3) {
 707                                 p += ref_size;
 708                                 continue;
 709                         }
 710
 711                         referrals[i].proximity = SVAL(p, 8);
 712                         referrals[i].ttl       = SVAL(p, 10);
 713
 714                         if (p + node_offset > endp) {
 715                                 goto out;
 716                         }
 717                         clistr_pull_talloc(ctx, cli->inbuf,
 718                                            &referrals[i].dfspath,
 719                                            p+node_offset, -1,
 720                                            STR_TERMINATE|STR_UNICODE);
 721
 722                         if (!referrals[i].dfspath) {
 723                                 goto out;
 724                         }
 725                         p += ref_size;
 726                 }
 727                 if (i < num_referrals) {
 728                         goto out;
 729                 }
 730         }
 731
 732         ret = true;
 733
 734         *num_refs = num_referrals;
 735         *refs = referrals;
 736
 737   out:
 738
 739         TALLOC_FREE(consumed_path);
 740         SAFE_FREE(param);
 741         SAFE_FREE(rdata);
 742         SAFE_FREE(rparam);
 743         return ret;
 744 }
 745
 746 /********************************************************************
 747 ********************************************************************/
 748
 749 bool cli_resolve_path(TALLOC_CTX *ctx,
 750                         const char *mountpt,
 751                         const struct user_auth_info *dfs_auth_info,
 752                         struct cli_state *rootcli,
 753                         const char *path,
 754                         struct cli_state **targetcli,
 755                         char **pp_targetpath)
 756 {
 757         CLIENT_DFS_REFERRAL *refs = NULL;
 758         size_t num_refs = 0;
 759         size_t consumed = 0;
 760         struct cli_state *cli_ipc = NULL;
 761         char *dfs_path = NULL;
 762         char *cleanpath = NULL;
 763         char *extrapath = NULL;
 764         int pathlen;
 765         char *server = NULL;
 766         char *share = NULL;
 767         struct cli_state *newcli = NULL;
 768         char *newpath = NULL;
 769         char *newmount = NULL;
 770         char *ppath = NULL;
 771         SMB_STRUCT_STAT sbuf;
 772         uint32 attributes;
 773
 774         if ( !rootcli || !path || !targetcli ) {
 775                 return false;
 776         }
 777
 778         /* Don't do anything if this is not a DFS root. */
 779
 780         if ( !rootcli->dfsroot) {
 781                 *targetcli = rootcli;
 782                 *pp_targetpath = talloc_strdup(ctx, path);
 783                 if (!*pp_targetpath) {
 784                         return false;
 785                 }
 786                 return true;
 787         }
 788
 789         *targetcli = NULL;
 790
 791         /* Send a trans2_query_path_info to check for a referral. */
 792
 793         cleanpath = clean_path(ctx, path);
 794         if (!cleanpath) {
 795                 return false;
 796         }
 797
 798         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 799         if (!dfs_path) {
 800                 return false;
 801         }
 802
 803         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 804                 /* This is an ordinary path, just return it. */
 805                 *targetcli = rootcli;
 806                 *pp_targetpath = talloc_strdup(ctx, path);
 807                 if (!*pp_targetpath) {
 808                         return false;
 809                 }
 810                 goto done;
 811         }
 812
 813         /* Special case where client asked for a path that does not exist */
 814
 815         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 816                 *targetcli = rootcli;
 817                 *pp_targetpath = talloc_strdup(ctx, path);
 818                 if (!*pp_targetpath) {
 819                         return false;
 820                 }
 821                 goto done;
 822         }
 823
 824         /* We got an error, check for DFS referral. */
 825
 826         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 827                 return false;
 828         }
 829
 830         /* Check for the referral. */
 831
 832         if (!(cli_ipc = cli_cm_open(ctx,
 833                                 rootcli,
 834                                 rootcli->desthost,
 835                                 "IPC$",
 836                                 dfs_auth_info,
 837                                 false,
 838                                 (rootcli->trans_enc_state != NULL),
 839                                 rootcli->protocol,
 840                                 0,
 841                                 0x20))) {
 842                 return false;
 843         }
 844
 845         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 846                         &num_refs, &consumed) || !num_refs) {
 847                 return false;
 848         }
 849
 850         /* Just store the first referral for now. */
 851
 852         if (!refs[0].dfspath) {
 853                 return false;
 854         }
 855         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 856
 857         if (!server || !share) {
 858                 return false;
 859         }
 860
 861         /* Make sure to recreate the original string including any wildcards. */
 862
 863         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 864         if (!dfs_path) {
 865                 return false;
 866         }
 867         pathlen = strlen(dfs_path);
 868         consumed = MIN(pathlen, consumed);
 869         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 870         if (!*pp_targetpath) {
 871                 return false;
 872         }
 873         dfs_path[consumed] = '\0';
 874
 875         /*
 876          * *pp_targetpath is now the unconsumed part of the path.
 877          * dfs_path is now the consumed part of the path
 878          * (in \server\share\path format).
 879          */
 880
 881         /* Open the connection to the target server & share */
 882         if ((*targetcli = cli_cm_open(ctx, rootcli,
 883                                         server,
 884                                         share,
 885                                         dfs_auth_info,
 886                                         false,
 887                                         (rootcli->trans_enc_state != NULL),
 888                                         rootcli->protocol,
 889                                         0,
 890                                         0x20)) == NULL) {
 891                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 892                         server, share );
 893                 return false;
 894         }
 895
 896         if (extrapath && strlen(extrapath) > 0) {
 897                 *pp_targetpath = talloc_asprintf(ctx,
 898                                                 "%s%s",
 899                                                 extrapath,
 900                                                 *pp_targetpath);
 901                 if (!*pp_targetpath) {
 902                         return false;
 903                 }
 904         }
 905
 906         /* parse out the consumed mount path */
 907         /* trim off the \server\share\ */
 908
 909         ppath = dfs_path;
 910
 911         if (*ppath != '\\') {
 912                 d_printf("cli_resolve_path: "
 913                         "dfs_path (%s) not in correct format.\n",
 914                         dfs_path );
 915                 return false;
 916         }
 917
 918         ppath++; /* Now pointing at start of server name. */
 919
 920         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 921                 return false;
 922         }
 923
 924         ppath++; /* Now pointing at start of share name. */
 925
 926         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 927                 return false;
 928         }
 929
 930         ppath++; /* Now pointing at path component. */
 931
 932         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 933         if (!newmount) {
 934                 return false;
 935         }
 936
 937         cli_set_mntpoint(*targetcli, newmount);
 938
 939         /* Check for another dfs referral, note that we are not
 940            checking for loops here. */
 941
 942         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 943                 if (cli_resolve_path(ctx,
 944                                         newmount,
 945                                         dfs_auth_info,
 946                                         *targetcli,
 947                                         *pp_targetpath,
 948                                         &newcli,
 949                                         &newpath)) {
 950                         /*
 951                          * When cli_resolve_path returns true here it's always
 952                          * returning the complete path in newpath, so we're done
 953                          * here.
 954                          */
 955                         *targetcli = newcli;
 956                         *pp_targetpath = newpath;
 957                         return true;
 958                 }
 959         }
 960
 961   done:
 962
 963         /* If returning true ensure we return a dfs root full path. */
 964         if ((*targetcli)->dfsroot) {
 965                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 966                 if (!dfs_path) {
 967                         return false;
 968                 }
 969                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 970         }
 971
 972         return true;
 973 }
 974
 975 /********************************************************************
 976 ********************************************************************/
 977
 978 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 979                                 struct cli_state *cli,
 980                                 const char *sharename,
 981                                 char **pp_newserver,
 982                                 char **pp_newshare,
 983                                 bool force_encrypt,
 984                                 const char *username,
 985                                 const char *password,
 986                                 const char *domain)
 987 {
 988         CLIENT_DFS_REFERRAL *refs = NULL;
 989         size_t num_refs = 0;
 990         size_t consumed = 0;
 991         char *fullpath = NULL;
 992         bool res;
 993         uint16 cnum;
 994         char *newextrapath = NULL;
 995
 996         if (!cli || !sharename) {
 997                 return false;
 998         }
 999
1000         cnum = cli->cnum;
1001
1002         /* special case.  never check for a referral on the IPC$ share */
1003
1004         if (strequal(sharename, "IPC$")) {
1005                 return false;
1006         }
1007
1008         /* send a trans2_query_path_info to check for a referral */
1009
1010         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1011         if (!fullpath) {
1012                 return false;
1013         }
1014
1015         /* check for the referral */
1016
1017         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1018                 return false;
1019         }
1020
1021         if (force_encrypt) {
1022                 NTSTATUS status = cli_cm_force_encryption(cli,
1023                                         username,
1024                                         password,
1025                                         lp_workgroup(),
1026                                         "IPC$");
1027                 if (!NT_STATUS_IS_OK(status)) {
1028                         return false;
1029                 }
1030         }
1031
1032         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1033
1034         if (!cli_tdis(cli)) {
1035                 return false;
1036         }
1037
1038         cli->cnum = cnum;
1039
1040         if (!res || !num_refs) {
1041                 return false;
1042         }
1043
1044         if (!refs[0].dfspath) {
1045                 return false;
1046         }
1047
1048         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1049                         pp_newshare, &newextrapath );
1050
1051         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1052                 return false;
1053         }
1054
1055         /* check that this is not a self-referral */
1056
1057         if (strequal(cli->desthost, *pp_newserver) &&
1058                         strequal(sharename, *pp_newshare)) {
1059                 return false;
1060         }
1061
1062         return true;
1063 }