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 /********************************************************************
  36  Ensure a connection is encrypted.
  37 ********************************************************************/
  38
  39 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  40                         const char *username,
  41                         const char *password,
  42                         const char *domain,
  43                         const char *sharename)
  44 {
  45         NTSTATUS status = cli_force_encryption(c,
  46                                         username,
  47                                         password,
  48                                         domain);
  49
  50         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  51                 d_printf("Encryption required and "
  52                         "server that doesn't support "
  53                         "UNIX extensions - failing connect\n");
  54         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  55                 d_printf("Encryption required and "
  56                         "can't get UNIX CIFS extensions "
  57                         "version from server.\n");
  58         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  59                 d_printf("Encryption required and "
  60                         "share %s doesn't support "
  61                         "encryption.\n", sharename);
  62         } else if (!NT_STATUS_IS_OK(status)) {
  63                 d_printf("Encryption required and "
  64                         "setup failed with error %s.\n",
  65                         nt_errstr(status));
  66         }
  67
  68         return status;
  69 }
  70
  71 /********************************************************************
  72  Return a connection to a server.
  73 ********************************************************************/
  74
  75 static struct cli_state *do_connect(TALLOC_CTX *ctx,
  76                                         const char *server,
  77                                         const char *share,
  78                                         const struct user_auth_info *auth_info,
  79                                         bool show_sessetup,
  80                                         bool force_encrypt,
  81                                         int max_protocol,
  82                                         int port,
  83                                         int name_type)
  84 {
  85         struct cli_state *c = NULL;
  86         struct nmb_name called, calling;
  87         const char *called_str;
  88         const char *server_n;
  89         struct sockaddr_storage ss;
  90         char *servicename;
  91         char *sharename;
  92         char *newserver, *newshare;
  93         const char *username;
  94         const char *password;
  95         NTSTATUS status;
  96
  97         /* make a copy so we don't modify the global string 'service' */
  98         servicename = talloc_strdup(ctx,share);
  99         if (!servicename) {
 100                 return NULL;
 101         }
 102         sharename = servicename;
 103         if (*sharename == '\\') {
 104                 sharename += 2;
 105                 called_str = sharename;
 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         } else {
 116                 called_str = server;
 117         }
 118
 119         server_n = server;
 120
 121         zero_sockaddr(&ss);
 122
 123         make_nmb_name(&calling, global_myname(), 0x0);
 124         make_nmb_name(&called , called_str, name_type);
 125
 126  again:
 127         zero_sockaddr(&ss);
 128
 129         /* have to open a new connection */
 130         if (!(c=cli_initialise_ex(get_cmdline_auth_info_signing_state(auth_info)))) {
 131                 d_printf("Connection to %s failed\n", server_n);
 132                 if (c) {
 133                         cli_shutdown(c);
 134                 }
 135                 return NULL;
 136         }
 137         if (port) {
 138                 cli_set_port(c, port);
 139         }
 140
 141         status = cli_connect(c, server_n, &ss);
 142         if (!NT_STATUS_IS_OK(status)) {
 143                 d_printf("Connection to %s failed (Error %s)\n",
 144                                 server_n,
 145                                 nt_errstr(status));
 146                 cli_shutdown(c);
 147                 return NULL;
 148         }
 149
 150         if (max_protocol == 0) {
 151                 max_protocol = PROTOCOL_NT1;
 152         }
 153         c->protocol = max_protocol;
 154         c->use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 155         c->fallback_after_kerberos =
 156                 get_cmdline_auth_info_fallback_after_kerberos(auth_info);
 157
 158         if (!cli_session_request(c, &calling, &called)) {
 159                 char *p;
 160                 d_printf("session request to %s failed (%s)\n",
 161                          called.name, cli_errstr(c));
 162                 cli_shutdown(c);
 163                 c = NULL;
 164                 if ((p=strchr_m(called.name, '.'))) {
 165                         *p = 0;
 166                         goto again;
 167                 }
 168                 if (strcmp(called.name, "*SMBSERVER")) {
 169                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 170                         goto again;
 171                 }
 172                 return NULL;
 173         }
 174
 175         DEBUG(4,(" session request ok\n"));
 176
 177         status = cli_negprot(c);
 178
 179         if (!NT_STATUS_IS_OK(status)) {
 180                 d_printf("protocol negotiation failed: %s\n",
 181                          nt_errstr(status));
 182                 cli_shutdown(c);
 183                 return NULL;
 184         }
 185
 186         username = get_cmdline_auth_info_username(auth_info);
 187         password = get_cmdline_auth_info_password(auth_info);
 188
 189         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 190                                                password, strlen(password),
 191                                                password, strlen(password),
 192                                                lp_workgroup()))) {
 193                 /* If a password was not supplied then
 194                  * try again with a null username. */
 195                 if (password[0] || !username[0] ||
 196                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 197                         !NT_STATUS_IS_OK(cli_session_setup(c, "",
 198                                                 "", 0,
 199                                                 "", 0,
 200                                                lp_workgroup()))) {
 201                         d_printf("session setup failed: %s\n", cli_errstr(c));
 202                         if (NT_STATUS_V(cli_nt_error(c)) ==
 203                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 204                                 d_printf("did you forget to run kinit?\n");
 205                         cli_shutdown(c);
 206                         return NULL;
 207                 }
 208                 d_printf("Anonymous login successful\n");
 209                 status = cli_init_creds(c, "", lp_workgroup(), "");
 210         } else {
 211                 status = cli_init_creds(c, username, lp_workgroup(), password);
 212         }
 213
 214         if (!NT_STATUS_IS_OK(status)) {
 215                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 216                 cli_shutdown(c);
 217                 return NULL;
 218         }
 219
 220         if ( show_sessetup ) {
 221                 if (*c->server_domain) {
 222                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 223                                 c->server_domain,c->server_os,c->server_type));
 224                 } else if (*c->server_os || *c->server_type) {
 225                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 226                                  c->server_os,c->server_type));
 227                 }
 228         }
 229         DEBUG(4,(" session setup ok\n"));
 230
 231         /* here's the fun part....to support 'msdfs proxy' shares
 232            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 233            here before trying to connect to the original share.
 234            cli_check_msdfs_proxy() will fail if it is a normal share. */
 235
 236         if ((c->capabilities & CAP_DFS) &&
 237                         cli_check_msdfs_proxy(ctx, c, sharename,
 238                                 &newserver, &newshare,
 239                                 force_encrypt,
 240                                 username,
 241                                 password,
 242                                 lp_workgroup())) {
 243                 cli_shutdown(c);
 244                 return do_connect(ctx, newserver,
 245                                 newshare, auth_info, false,
 246                                 force_encrypt, max_protocol,
 247                                 port, name_type);
 248         }
 249
 250         /* must be a normal share */
 251
 252         status = cli_tcon_andx(c, sharename, "?????",
 253                                password, strlen(password)+1);
 254         if (!NT_STATUS_IS_OK(status)) {
 255                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 256                 cli_shutdown(c);
 257                 return NULL;
 258         }
 259
 260         if (force_encrypt) {
 261                 status = cli_cm_force_encryption(c,
 262                                         username,
 263                                         password,
 264                                         lp_workgroup(),
 265                                         sharename);
 266                 if (!NT_STATUS_IS_OK(status)) {
 267                         cli_shutdown(c);
 268                         return NULL;
 269                 }
 270         }
 271
 272         DEBUG(4,(" tconx ok\n"));
 273         return c;
 274 }
 275
 276 /****************************************************************************
 277 ****************************************************************************/
 278
 279 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 280 {
 281         char *name = clean_name(NULL, mnt);
 282         if (!name) {
 283                 return;
 284         }
 285         TALLOC_FREE(cli->dfs_mountpoint);
 286         cli->dfs_mountpoint = talloc_strdup(cli, name);
 287         TALLOC_FREE(name);
 288 }
 289
 290 /********************************************************************
 291  Add a new connection to the list.
 292  referring_cli == NULL means a new initial connection.
 293 ********************************************************************/
 294
 295 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 296                                         struct cli_state *referring_cli,
 297                                         const char *server,
 298                                         const char *share,
 299                                         const struct user_auth_info *auth_info,
 300                                         bool show_hdr,
 301                                         bool force_encrypt,
 302                                         int max_protocol,
 303                                         int port,
 304                                         int name_type)
 305 {
 306         struct cli_state *cli;
 307
 308         cli = do_connect(ctx, server, share,
 309                                 auth_info,
 310                                 show_hdr, force_encrypt, max_protocol,
 311                                 port, name_type);
 312
 313         if (!cli ) {
 314                 return NULL;
 315         }
 316
 317         /* Enter into the list. */
 318         if (referring_cli) {
 319                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 320         }
 321
 322         if (referring_cli && referring_cli->posix_capabilities) {
 323                 uint16 major, minor;
 324                 uint32 caplow, caphigh;
 325                 NTSTATUS status;
 326                 status = cli_unix_extensions_version(cli, &major, &minor,
 327                                                      &caplow, &caphigh);
 328                 if (NT_STATUS_IS_OK(status)) {
 329                         cli_set_unix_extensions_capabilities(cli,
 330                                         major, minor,
 331                                         caplow, caphigh);
 332                 }
 333         }
 334
 335         return cli;
 336 }
 337
 338 /********************************************************************
 339  Return a connection to a server on a particular share.
 340 ********************************************************************/
 341
 342 static struct cli_state *cli_cm_find(struct cli_state *cli,
 343                                 const char *server,
 344                                 const char *share)
 345 {
 346         struct cli_state *p;
 347
 348         if (cli == NULL) {
 349                 return NULL;
 350         }
 351
 352         /* Search to the start of the list. */
 353         for (p = cli; p; p = p->prev) {
 354                 if (strequal(server, p->desthost) &&
 355                                 strequal(share,p->share)) {
 356                         return p;
 357                 }
 358         }
 359
 360         /* Search to the end of the list. */
 361         for (p = cli->next; p; p = p->next) {
 362                 if (strequal(server, p->desthost) &&
 363                                 strequal(share,p->share)) {
 364                         return p;
 365                 }
 366         }
 367
 368         return NULL;
 369 }
 370
 371 /****************************************************************************
 372  Open a client connection to a \\server\share.
 373 ****************************************************************************/
 374
 375 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 376                                 struct cli_state *referring_cli,
 377                                 const char *server,
 378                                 const char *share,
 379                                 const struct user_auth_info *auth_info,
 380                                 bool show_hdr,
 381                                 bool force_encrypt,
 382                                 int max_protocol,
 383                                 int port,
 384                                 int name_type)
 385 {
 386         /* Try to reuse an existing connection in this list. */
 387         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 388
 389         if (c) {
 390                 return c;
 391         }
 392
 393         if (auth_info == NULL) {
 394                 /* Can't do a new connection
 395                  * without auth info. */
 396                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 397                         "without auth info\n",
 398                         server, share );
 399                 return NULL;
 400         }
 401
 402         return cli_cm_connect(ctx,
 403                                 referring_cli,
 404                                 server,
 405                                 share,
 406                                 auth_info,
 407                                 show_hdr,
 408                                 force_encrypt,
 409                                 max_protocol,
 410                                 port,
 411                                 name_type);
 412 }
 413
 414 /****************************************************************************
 415 ****************************************************************************/
 416
 417 void cli_cm_display(const struct cli_state *cli)
 418 {
 419         int i;
 420
 421         for (i=0; cli; cli = cli->next,i++ ) {
 422                 d_printf("%d:\tserver=%s, share=%s\n",
 423                         i, cli->desthost, cli->share );
 424         }
 425 }
 426
 427 /****************************************************************************
 428 ****************************************************************************/
 429
 430 /****************************************************************************
 431 ****************************************************************************/
 432
 433 #if 0
 434 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 435 {
 436         SAFE_FREE(cm_creds.username);
 437         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 438                                                auth_info));
 439
 440         if (get_cmdline_auth_info_got_pass(auth_info)) {
 441                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 442         }
 443
 444         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 445         cm_creds.fallback_after_kerberos = false;
 446         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 447 }
 448 #endif
 449
 450 /**********************************************************************
 451  split a dfs path into the server, share name, and extrapath components
 452 **********************************************************************/
 453
 454 static void split_dfs_path(TALLOC_CTX *ctx,
 455                                 const char *nodepath,
 456                                 char **pp_server,
 457                                 char **pp_share,
 458                                 char **pp_extrapath)
 459 {
 460         char *p, *q;
 461         char *path;
 462
 463         *pp_server = NULL;
 464         *pp_share = NULL;
 465         *pp_extrapath = NULL;
 466
 467         path = talloc_strdup(ctx, nodepath);
 468         if (!path) {
 469                 return;
 470         }
 471
 472         if ( path[0] != '\\' ) {
 473                 return;
 474         }
 475
 476         p = strchr_m( path + 1, '\\' );
 477         if ( !p ) {
 478                 return;
 479         }
 480
 481         *p = '\0';
 482         p++;
 483
 484         /* Look for any extra/deep path */
 485         q = strchr_m(p, '\\');
 486         if (q != NULL) {
 487                 *q = '\0';
 488                 q++;
 489                 *pp_extrapath = talloc_strdup(ctx, q);
 490         } else {
 491                 *pp_extrapath = talloc_strdup(ctx, "");
 492         }
 493
 494         *pp_share = talloc_strdup(ctx, p);
 495         *pp_server = talloc_strdup(ctx, &path[1]);
 496 }
 497
 498 /****************************************************************************
 499  Return the original path truncated at the directory component before
 500  the first wildcard character. Trust the caller to provide a NULL
 501  terminated string
 502 ****************************************************************************/
 503
 504 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 505 {
 506         size_t len;
 507         char *p1, *p2, *p;
 508         char *path_out;
 509
 510         /* No absolute paths. */
 511         while (IS_DIRECTORY_SEP(*path)) {
 512                 path++;
 513         }
 514
 515         path_out = talloc_strdup(ctx, path);
 516         if (!path_out) {
 517                 return NULL;
 518         }
 519
 520         p1 = strchr_m(path_out, '*');
 521         p2 = strchr_m(path_out, '?');
 522
 523         if (p1 || p2) {
 524                 if (p1 && p2) {
 525                         p = MIN(p1,p2);
 526                 } else if (!p1) {
 527                         p = p2;
 528                 } else {
 529                         p = p1;
 530                 }
 531                 *p = '\0';
 532
 533                 /* Now go back to the start of this component. */
 534                 p1 = strrchr_m(path_out, '/');
 535                 p2 = strrchr_m(path_out, '\\');
 536                 p = MAX(p1,p2);
 537                 if (p) {
 538                         *p = '\0';
 539                 }
 540         }
 541
 542         /* Strip any trailing separator */
 543
 544         len = strlen(path_out);
 545         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 546                 path_out[len-1] = '\0';
 547         }
 548
 549         return path_out;
 550 }
 551
 552 /****************************************************************************
 553 ****************************************************************************/
 554
 555 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 556                                         struct cli_state *cli,
 557                                         const char *dir)
 558 {
 559         char path_sep = '\\';
 560
 561         /* Ensure the extrapath doesn't start with a separator. */
 562         while (IS_DIRECTORY_SEP(*dir)) {
 563                 dir++;
 564         }
 565
 566         if (cli->posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 567                 path_sep = '/';
 568         }
 569         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 570                         path_sep,
 571                         cli->desthost,
 572                         path_sep,
 573                         cli->share,
 574                         path_sep,
 575                         dir);
 576 }
 577
 578 /********************************************************************
 579  check for dfs referral
 580 ********************************************************************/
 581
 582 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 583 {
 584         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 585
 586         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 587
 588         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 589                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 590                 return false;
 591
 592         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 593                 return true;
 594
 595         return false;
 596 }
 597
 598 /********************************************************************
 599  Get the dfs referral link.
 600 ********************************************************************/
 601
 602 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 603                         struct cli_state *cli,
 604                         const char *path,
 605                         struct client_dfs_referral **refs,
 606                         size_t *num_refs,
 607                         size_t *consumed)
 608 {
 609         unsigned int data_len = 0;
 610         unsigned int param_len = 0;
 611         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 612         char *param = NULL;
 613         char *rparam=NULL, *rdata=NULL;
 614         char *p;
 615         char *endp;
 616         size_t pathlen = 2*(strlen(path)+1);
 617         smb_ucs2_t *path_ucs;
 618         char *consumed_path = NULL;
 619         uint16_t consumed_ucs;
 620         uint16 num_referrals;
 621         struct client_dfs_referral *referrals = NULL;
 622         bool ret = false;
 623
 624         *num_refs = 0;
 625         *refs = NULL;
 626
 627         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 628         if (!param) {
 629                 goto out;
 630         }
 631         SSVAL(param, 0, 0x03);  /* max referral level */
 632         p = &param[2];
 633
 634         path_ucs = (smb_ucs2_t *)p;
 635         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 636         param_len = PTR_DIFF(p, param);
 637
 638         if (!cli_send_trans(cli, SMBtrans2,
 639                         NULL,                        /* name */
 640                         -1, 0,                          /* fid, flags */
 641                         &setup, 1, 0,                   /* setup, length, max */
 642                         param, param_len, 2,            /* param, length, max */
 643                         NULL, 0, cli->max_xmit /* data, length, max */
 644                         )) {
 645                 goto out;
 646         }
 647
 648         if (!cli_receive_trans(cli, SMBtrans2,
 649                 &rparam, &param_len,
 650                 &rdata, &data_len)) {
 651                 goto out;
 652         }
 653
 654         if (data_len < 4) {
 655                 goto out;
 656         }
 657
 658         endp = rdata + data_len;
 659
 660         consumed_ucs  = SVAL(rdata, 0);
 661         num_referrals = SVAL(rdata, 2);
 662
 663         /* consumed_ucs is the number of bytes
 664          * of the UCS2 path consumed not counting any
 665          * terminating null. We need to convert
 666          * back to unix charset and count again
 667          * to get the number of bytes consumed from
 668          * the incoming path. */
 669
 670         if (pull_string_talloc(talloc_tos(),
 671                         NULL,
 672                         0,
 673                         &consumed_path,
 674                         path_ucs,
 675                         consumed_ucs,
 676                         STR_UNICODE) == 0) {
 677                 goto out;
 678         }
 679         if (consumed_path == NULL) {
 680                 goto out;
 681         }
 682         *consumed = strlen(consumed_path);
 683
 684         if (num_referrals != 0) {
 685                 uint16 ref_version;
 686                 uint16 ref_size;
 687                 int i;
 688                 uint16 node_offset;
 689
 690                 referrals = talloc_array(ctx, struct client_dfs_referral,
 691                                          num_referrals);
 692
 693                 if (!referrals) {
 694                         goto out;
 695                 }
 696                 /* start at the referrals array */
 697
 698                 p = rdata+8;
 699                 for (i=0; i<num_referrals && p < endp; i++) {
 700                         if (p + 18 > endp) {
 701                                 goto out;
 702                         }
 703                         ref_version = SVAL(p, 0);
 704                         ref_size    = SVAL(p, 2);
 705                         node_offset = SVAL(p, 16);
 706
 707                         if (ref_version != 3) {
 708                                 p += ref_size;
 709                                 continue;
 710                         }
 711
 712                         referrals[i].proximity = SVAL(p, 8);
 713                         referrals[i].ttl       = SVAL(p, 10);
 714
 715                         if (p + node_offset > endp) {
 716                                 goto out;
 717                         }
 718                         clistr_pull_talloc(ctx, cli->inbuf,
 719                                            &referrals[i].dfspath,
 720                                            p+node_offset, -1,
 721                                            STR_TERMINATE|STR_UNICODE);
 722
 723                         if (!referrals[i].dfspath) {
 724                                 goto out;
 725                         }
 726                         p += ref_size;
 727                 }
 728                 if (i < num_referrals) {
 729                         goto out;
 730                 }
 731         }
 732
 733         ret = true;
 734
 735         *num_refs = num_referrals;
 736         *refs = referrals;
 737
 738   out:
 739
 740         TALLOC_FREE(consumed_path);
 741         SAFE_FREE(param);
 742         SAFE_FREE(rdata);
 743         SAFE_FREE(rparam);
 744         return ret;
 745 }
 746
 747 /********************************************************************
 748 ********************************************************************/
 749
 750 bool cli_resolve_path(TALLOC_CTX *ctx,
 751                         const char *mountpt,
 752                         const struct user_auth_info *dfs_auth_info,
 753                         struct cli_state *rootcli,
 754                         const char *path,
 755                         struct cli_state **targetcli,
 756                         char **pp_targetpath)
 757 {
 758         struct client_dfs_referral *refs = NULL;
 759         size_t num_refs = 0;
 760         size_t consumed = 0;
 761         struct cli_state *cli_ipc = NULL;
 762         char *dfs_path = NULL;
 763         char *cleanpath = NULL;
 764         char *extrapath = NULL;
 765         int pathlen;
 766         char *server = NULL;
 767         char *share = NULL;
 768         struct cli_state *newcli = NULL;
 769         char *newpath = NULL;
 770         char *newmount = NULL;
 771         char *ppath = NULL;
 772         SMB_STRUCT_STAT sbuf;
 773         uint32 attributes;
 774
 775         if ( !rootcli || !path || !targetcli ) {
 776                 return false;
 777         }
 778
 779         /* Don't do anything if this is not a DFS root. */
 780
 781         if ( !rootcli->dfsroot) {
 782                 *targetcli = rootcli;
 783                 *pp_targetpath = talloc_strdup(ctx, path);
 784                 if (!*pp_targetpath) {
 785                         return false;
 786                 }
 787                 return true;
 788         }
 789
 790         *targetcli = NULL;
 791
 792         /* Send a trans2_query_path_info to check for a referral. */
 793
 794         cleanpath = clean_path(ctx, path);
 795         if (!cleanpath) {
 796                 return false;
 797         }
 798
 799         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 800         if (!dfs_path) {
 801                 return false;
 802         }
 803
 804         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 805                 /* This is an ordinary path, just return it. */
 806                 *targetcli = rootcli;
 807                 *pp_targetpath = talloc_strdup(ctx, path);
 808                 if (!*pp_targetpath) {
 809                         return false;
 810                 }
 811                 goto done;
 812         }
 813
 814         /* Special case where client asked for a path that does not exist */
 815
 816         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 817                 *targetcli = rootcli;
 818                 *pp_targetpath = talloc_strdup(ctx, path);
 819                 if (!*pp_targetpath) {
 820                         return false;
 821                 }
 822                 goto done;
 823         }
 824
 825         /* We got an error, check for DFS referral. */
 826
 827         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 828                 return false;
 829         }
 830
 831         /* Check for the referral. */
 832
 833         if (!(cli_ipc = cli_cm_open(ctx,
 834                                 rootcli,
 835                                 rootcli->desthost,
 836                                 "IPC$",
 837                                 dfs_auth_info,
 838                                 false,
 839                                 (rootcli->trans_enc_state != NULL),
 840                                 rootcli->protocol,
 841                                 0,
 842                                 0x20))) {
 843                 return false;
 844         }
 845
 846         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 847                         &num_refs, &consumed) || !num_refs) {
 848                 return false;
 849         }
 850
 851         /* Just store the first referral for now. */
 852
 853         if (!refs[0].dfspath) {
 854                 return false;
 855         }
 856         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 857
 858         if (!server || !share) {
 859                 return false;
 860         }
 861
 862         /* Make sure to recreate the original string including any wildcards. */
 863
 864         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 865         if (!dfs_path) {
 866                 return false;
 867         }
 868         pathlen = strlen(dfs_path);
 869         consumed = MIN(pathlen, consumed);
 870         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 871         if (!*pp_targetpath) {
 872                 return false;
 873         }
 874         dfs_path[consumed] = '\0';
 875
 876         /*
 877          * *pp_targetpath is now the unconsumed part of the path.
 878          * dfs_path is now the consumed part of the path
 879          * (in \server\share\path format).
 880          */
 881
 882         /* Open the connection to the target server & share */
 883         if ((*targetcli = cli_cm_open(ctx, rootcli,
 884                                         server,
 885                                         share,
 886                                         dfs_auth_info,
 887                                         false,
 888                                         (rootcli->trans_enc_state != NULL),
 889                                         rootcli->protocol,
 890                                         0,
 891                                         0x20)) == NULL) {
 892                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 893                         server, share );
 894                 return false;
 895         }
 896
 897         if (extrapath && strlen(extrapath) > 0) {
 898                 *pp_targetpath = talloc_asprintf(ctx,
 899                                                 "%s%s",
 900                                                 extrapath,
 901                                                 *pp_targetpath);
 902                 if (!*pp_targetpath) {
 903                         return false;
 904                 }
 905         }
 906
 907         /* parse out the consumed mount path */
 908         /* trim off the \server\share\ */
 909
 910         ppath = dfs_path;
 911
 912         if (*ppath != '\\') {
 913                 d_printf("cli_resolve_path: "
 914                         "dfs_path (%s) not in correct format.\n",
 915                         dfs_path );
 916                 return false;
 917         }
 918
 919         ppath++; /* Now pointing at start of server name. */
 920
 921         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 922                 return false;
 923         }
 924
 925         ppath++; /* Now pointing at start of share name. */
 926
 927         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 928                 return false;
 929         }
 930
 931         ppath++; /* Now pointing at path component. */
 932
 933         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 934         if (!newmount) {
 935                 return false;
 936         }
 937
 938         cli_set_mntpoint(*targetcli, newmount);
 939
 940         /* Check for another dfs referral, note that we are not
 941            checking for loops here. */
 942
 943         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 944                 if (cli_resolve_path(ctx,
 945                                         newmount,
 946                                         dfs_auth_info,
 947                                         *targetcli,
 948                                         *pp_targetpath,
 949                                         &newcli,
 950                                         &newpath)) {
 951                         /*
 952                          * When cli_resolve_path returns true here it's always
 953                          * returning the complete path in newpath, so we're done
 954                          * here.
 955                          */
 956                         *targetcli = newcli;
 957                         *pp_targetpath = newpath;
 958                         return true;
 959                 }
 960         }
 961
 962   done:
 963
 964         /* If returning true ensure we return a dfs root full path. */
 965         if ((*targetcli)->dfsroot) {
 966                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 967                 if (!dfs_path) {
 968                         return false;
 969                 }
 970                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 971         }
 972
 973         return true;
 974 }
 975
 976 /********************************************************************
 977 ********************************************************************/
 978
 979 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 980                                 struct cli_state *cli,
 981                                 const char *sharename,
 982                                 char **pp_newserver,
 983                                 char **pp_newshare,
 984                                 bool force_encrypt,
 985                                 const char *username,
 986                                 const char *password,
 987                                 const char *domain)
 988 {
 989         struct client_dfs_referral *refs = NULL;
 990         size_t num_refs = 0;
 991         size_t consumed = 0;
 992         char *fullpath = NULL;
 993         bool res;
 994         uint16 cnum;
 995         char *newextrapath = NULL;
 996         NTSTATUS status;
 997
 998         if (!cli || !sharename) {
 999                 return false;
1000         }
1001
1002         cnum = cli->cnum;
1003
1004         /* special case.  never check for a referral on the IPC$ share */
1005
1006         if (strequal(sharename, "IPC$")) {
1007                 return false;
1008         }
1009
1010         /* send a trans2_query_path_info to check for a referral */
1011
1012         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1013         if (!fullpath) {
1014                 return false;
1015         }
1016
1017         /* check for the referral */
1018
1019         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1020                 return false;
1021         }
1022
1023         if (force_encrypt) {
1024                 status = cli_cm_force_encryption(cli,
1025                                         username,
1026                                         password,
1027                                         lp_workgroup(),
1028                                         "IPC$");
1029                 if (!NT_STATUS_IS_OK(status)) {
1030                         return false;
1031                 }
1032         }
1033
1034         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1035
1036         status = cli_tdis(cli);
1037         if (!NT_STATUS_IS_OK(status)) {
1038                 return false;
1039         }
1040
1041         cli->cnum = cnum;
1042
1043         if (!res || !num_refs) {
1044                 return false;
1045         }
1046
1047         if (!refs[0].dfspath) {
1048                 return false;
1049         }
1050
1051         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1052                         pp_newshare, &newextrapath );
1053
1054         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1055                 return false;
1056         }
1057
1058         /* check that this is not a self-referral */
1059
1060         if (strequal(cli->desthost, *pp_newserver) &&
1061                         strequal(sharename, *pp_newshare)) {
1062                 return false;
1063         }
1064
1065         return true;
1066 }