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                 if (cli_unix_extensions_version(cli, &major,
 326                                         &minor, &caplow, &caphigh)) {
 327                         cli_set_unix_extensions_capabilities(cli,
 328                                         major, minor,
 329                                         caplow, caphigh);
 330                 }
 331         }
 332
 333         return cli;
 334 }
 335
 336 /********************************************************************
 337  Return a connection to a server on a particular share.
 338 ********************************************************************/
 339
 340 static struct cli_state *cli_cm_find(struct cli_state *cli,
 341                                 const char *server,
 342                                 const char *share)
 343 {
 344         struct cli_state *p;
 345
 346         if (cli == NULL) {
 347                 return NULL;
 348         }
 349
 350         /* Search to the start of the list. */
 351         for (p = cli; p; p = p->prev) {
 352                 if (strequal(server, p->desthost) &&
 353                                 strequal(share,p->share)) {
 354                         return p;
 355                 }
 356         }
 357
 358         /* Search to the end of the list. */
 359         for (p = cli->next; p; p = p->next) {
 360                 if (strequal(server, p->desthost) &&
 361                                 strequal(share,p->share)) {
 362                         return p;
 363                 }
 364         }
 365
 366         return NULL;
 367 }
 368
 369 /****************************************************************************
 370  Open a client connection to a \\server\share.
 371 ****************************************************************************/
 372
 373 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 374                                 struct cli_state *referring_cli,
 375                                 const char *server,
 376                                 const char *share,
 377                                 const struct user_auth_info *auth_info,
 378                                 bool show_hdr,
 379                                 bool force_encrypt,
 380                                 int max_protocol,
 381                                 int port,
 382                                 int name_type)
 383 {
 384         /* Try to reuse an existing connection in this list. */
 385         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 386
 387         if (c) {
 388                 return c;
 389         }
 390
 391         if (auth_info == NULL) {
 392                 /* Can't do a new connection
 393                  * without auth info. */
 394                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 395                         "without auth info\n",
 396                         server, share );
 397                 return NULL;
 398         }
 399
 400         return cli_cm_connect(ctx,
 401                                 referring_cli,
 402                                 server,
 403                                 share,
 404                                 auth_info,
 405                                 show_hdr,
 406                                 force_encrypt,
 407                                 max_protocol,
 408                                 port,
 409                                 name_type);
 410 }
 411
 412 /****************************************************************************
 413 ****************************************************************************/
 414
 415 void cli_cm_display(const struct cli_state *cli)
 416 {
 417         int i;
 418
 419         for (i=0; cli; cli = cli->next,i++ ) {
 420                 d_printf("%d:\tserver=%s, share=%s\n",
 421                         i, cli->desthost, cli->share );
 422         }
 423 }
 424
 425 /****************************************************************************
 426 ****************************************************************************/
 427
 428 /****************************************************************************
 429 ****************************************************************************/
 430
 431 #if 0
 432 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 433 {
 434         SAFE_FREE(cm_creds.username);
 435         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 436                                                auth_info));
 437
 438         if (get_cmdline_auth_info_got_pass(auth_info)) {
 439                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 440         }
 441
 442         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 443         cm_creds.fallback_after_kerberos = false;
 444         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 445 }
 446 #endif
 447
 448 /**********************************************************************
 449  split a dfs path into the server, share name, and extrapath components
 450 **********************************************************************/
 451
 452 static void split_dfs_path(TALLOC_CTX *ctx,
 453                                 const char *nodepath,
 454                                 char **pp_server,
 455                                 char **pp_share,
 456                                 char **pp_extrapath)
 457 {
 458         char *p, *q;
 459         char *path;
 460
 461         *pp_server = NULL;
 462         *pp_share = NULL;
 463         *pp_extrapath = NULL;
 464
 465         path = talloc_strdup(ctx, nodepath);
 466         if (!path) {
 467                 return;
 468         }
 469
 470         if ( path[0] != '\\' ) {
 471                 return;
 472         }
 473
 474         p = strchr_m( path + 1, '\\' );
 475         if ( !p ) {
 476                 return;
 477         }
 478
 479         *p = '\0';
 480         p++;
 481
 482         /* Look for any extra/deep path */
 483         q = strchr_m(p, '\\');
 484         if (q != NULL) {
 485                 *q = '\0';
 486                 q++;
 487                 *pp_extrapath = talloc_strdup(ctx, q);
 488         } else {
 489                 *pp_extrapath = talloc_strdup(ctx, "");
 490         }
 491
 492         *pp_share = talloc_strdup(ctx, p);
 493         *pp_server = talloc_strdup(ctx, &path[1]);
 494 }
 495
 496 /****************************************************************************
 497  Return the original path truncated at the directory component before
 498  the first wildcard character. Trust the caller to provide a NULL
 499  terminated string
 500 ****************************************************************************/
 501
 502 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 503 {
 504         size_t len;
 505         char *p1, *p2, *p;
 506         char *path_out;
 507
 508         /* No absolute paths. */
 509         while (IS_DIRECTORY_SEP(*path)) {
 510                 path++;
 511         }
 512
 513         path_out = talloc_strdup(ctx, path);
 514         if (!path_out) {
 515                 return NULL;
 516         }
 517
 518         p1 = strchr_m(path_out, '*');
 519         p2 = strchr_m(path_out, '?');
 520
 521         if (p1 || p2) {
 522                 if (p1 && p2) {
 523                         p = MIN(p1,p2);
 524                 } else if (!p1) {
 525                         p = p2;
 526                 } else {
 527                         p = p1;
 528                 }
 529                 *p = '\0';
 530
 531                 /* Now go back to the start of this component. */
 532                 p1 = strrchr_m(path_out, '/');
 533                 p2 = strrchr_m(path_out, '\\');
 534                 p = MAX(p1,p2);
 535                 if (p) {
 536                         *p = '\0';
 537                 }
 538         }
 539
 540         /* Strip any trailing separator */
 541
 542         len = strlen(path_out);
 543         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 544                 path_out[len-1] = '\0';
 545         }
 546
 547         return path_out;
 548 }
 549
 550 /****************************************************************************
 551 ****************************************************************************/
 552
 553 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 554                                         struct cli_state *cli,
 555                                         const char *dir)
 556 {
 557         char path_sep = '\\';
 558
 559         /* Ensure the extrapath doesn't start with a separator. */
 560         while (IS_DIRECTORY_SEP(*dir)) {
 561                 dir++;
 562         }
 563
 564         if (cli->posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 565                 path_sep = '/';
 566         }
 567         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 568                         path_sep,
 569                         cli->desthost,
 570                         path_sep,
 571                         cli->share,
 572                         path_sep,
 573                         dir);
 574 }
 575
 576 /********************************************************************
 577  check for dfs referral
 578 ********************************************************************/
 579
 580 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 581 {
 582         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 583
 584         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 585
 586         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 587                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 588                 return false;
 589
 590         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 591                 return true;
 592
 593         return false;
 594 }
 595
 596 /********************************************************************
 597  Get the dfs referral link.
 598 ********************************************************************/
 599
 600 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 601                         struct cli_state *cli,
 602                         const char *path,
 603                         CLIENT_DFS_REFERRAL**refs,
 604                         size_t *num_refs,
 605                         size_t *consumed)
 606 {
 607         unsigned int data_len = 0;
 608         unsigned int param_len = 0;
 609         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 610         char *param = NULL;
 611         char *rparam=NULL, *rdata=NULL;
 612         char *p;
 613         char *endp;
 614         size_t pathlen = 2*(strlen(path)+1);
 615         smb_ucs2_t *path_ucs;
 616         char *consumed_path = NULL;
 617         uint16_t consumed_ucs;
 618         uint16 num_referrals;
 619         CLIENT_DFS_REFERRAL *referrals = NULL;
 620         bool ret = false;
 621
 622         *num_refs = 0;
 623         *refs = NULL;
 624
 625         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 626         if (!param) {
 627                 goto out;
 628         }
 629         SSVAL(param, 0, 0x03);  /* max referral level */
 630         p = &param[2];
 631
 632         path_ucs = (smb_ucs2_t *)p;
 633         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 634         param_len = PTR_DIFF(p, param);
 635
 636         if (!cli_send_trans(cli, SMBtrans2,
 637                         NULL,                        /* name */
 638                         -1, 0,                          /* fid, flags */
 639                         &setup, 1, 0,                   /* setup, length, max */
 640                         param, param_len, 2,            /* param, length, max */
 641                         NULL, 0, cli->max_xmit /* data, length, max */
 642                         )) {
 643                 goto out;
 644         }
 645
 646         if (!cli_receive_trans(cli, SMBtrans2,
 647                 &rparam, &param_len,
 648                 &rdata, &data_len)) {
 649                 goto out;
 650         }
 651
 652         if (data_len < 4) {
 653                 goto out;
 654         }
 655
 656         endp = rdata + data_len;
 657
 658         consumed_ucs  = SVAL(rdata, 0);
 659         num_referrals = SVAL(rdata, 2);
 660
 661         /* consumed_ucs is the number of bytes
 662          * of the UCS2 path consumed not counting any
 663          * terminating null. We need to convert
 664          * back to unix charset and count again
 665          * to get the number of bytes consumed from
 666          * the incoming path. */
 667
 668         if (pull_string_talloc(talloc_tos(),
 669                         NULL,
 670                         0,
 671                         &consumed_path,
 672                         path_ucs,
 673                         consumed_ucs,
 674                         STR_UNICODE) == 0) {
 675                 goto out;
 676         }
 677         if (consumed_path == NULL) {
 678                 goto out;
 679         }
 680         *consumed = strlen(consumed_path);
 681
 682         if (num_referrals != 0) {
 683                 uint16 ref_version;
 684                 uint16 ref_size;
 685                 int i;
 686                 uint16 node_offset;
 687
 688                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 689                                 num_referrals);
 690
 691                 if (!referrals) {
 692                         goto out;
 693                 }
 694                 /* start at the referrals array */
 695
 696                 p = rdata+8;
 697                 for (i=0; i<num_referrals && p < endp; i++) {
 698                         if (p + 18 > endp) {
 699                                 goto out;
 700                         }
 701                         ref_version = SVAL(p, 0);
 702                         ref_size    = SVAL(p, 2);
 703                         node_offset = SVAL(p, 16);
 704
 705                         if (ref_version != 3) {
 706                                 p += ref_size;
 707                                 continue;
 708                         }
 709
 710                         referrals[i].proximity = SVAL(p, 8);
 711                         referrals[i].ttl       = SVAL(p, 10);
 712
 713                         if (p + node_offset > endp) {
 714                                 goto out;
 715                         }
 716                         clistr_pull_talloc(ctx, cli->inbuf,
 717                                            &referrals[i].dfspath,
 718                                            p+node_offset, -1,
 719                                            STR_TERMINATE|STR_UNICODE);
 720
 721                         if (!referrals[i].dfspath) {
 722                                 goto out;
 723                         }
 724                         p += ref_size;
 725                 }
 726                 if (i < num_referrals) {
 727                         goto out;
 728                 }
 729         }
 730
 731         ret = true;
 732
 733         *num_refs = num_referrals;
 734         *refs = referrals;
 735
 736   out:
 737
 738         TALLOC_FREE(consumed_path);
 739         SAFE_FREE(param);
 740         SAFE_FREE(rdata);
 741         SAFE_FREE(rparam);
 742         return ret;
 743 }
 744
 745 /********************************************************************
 746 ********************************************************************/
 747
 748 bool cli_resolve_path(TALLOC_CTX *ctx,
 749                         const char *mountpt,
 750                         const struct user_auth_info *dfs_auth_info,
 751                         struct cli_state *rootcli,
 752                         const char *path,
 753                         struct cli_state **targetcli,
 754                         char **pp_targetpath)
 755 {
 756         CLIENT_DFS_REFERRAL *refs = NULL;
 757         size_t num_refs = 0;
 758         size_t consumed = 0;
 759         struct cli_state *cli_ipc = NULL;
 760         char *dfs_path = NULL;
 761         char *cleanpath = NULL;
 762         char *extrapath = NULL;
 763         int pathlen;
 764         char *server = NULL;
 765         char *share = NULL;
 766         struct cli_state *newcli = NULL;
 767         char *newpath = NULL;
 768         char *newmount = NULL;
 769         char *ppath = NULL;
 770         SMB_STRUCT_STAT sbuf;
 771         uint32 attributes;
 772
 773         if ( !rootcli || !path || !targetcli ) {
 774                 return false;
 775         }
 776
 777         /* Don't do anything if this is not a DFS root. */
 778
 779         if ( !rootcli->dfsroot) {
 780                 *targetcli = rootcli;
 781                 *pp_targetpath = talloc_strdup(ctx, path);
 782                 if (!*pp_targetpath) {
 783                         return false;
 784                 }
 785                 return true;
 786         }
 787
 788         *targetcli = NULL;
 789
 790         /* Send a trans2_query_path_info to check for a referral. */
 791
 792         cleanpath = clean_path(ctx, path);
 793         if (!cleanpath) {
 794                 return false;
 795         }
 796
 797         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 798         if (!dfs_path) {
 799                 return false;
 800         }
 801
 802         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 803                 /* This is an ordinary path, just return it. */
 804                 *targetcli = rootcli;
 805                 *pp_targetpath = talloc_strdup(ctx, path);
 806                 if (!*pp_targetpath) {
 807                         return false;
 808                 }
 809                 goto done;
 810         }
 811
 812         /* Special case where client asked for a path that does not exist */
 813
 814         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 815                 *targetcli = rootcli;
 816                 *pp_targetpath = talloc_strdup(ctx, path);
 817                 if (!*pp_targetpath) {
 818                         return false;
 819                 }
 820                 goto done;
 821         }
 822
 823         /* We got an error, check for DFS referral. */
 824
 825         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 826                 return false;
 827         }
 828
 829         /* Check for the referral. */
 830
 831         if (!(cli_ipc = cli_cm_open(ctx,
 832                                 rootcli,
 833                                 rootcli->desthost,
 834                                 "IPC$",
 835                                 dfs_auth_info,
 836                                 false,
 837                                 (rootcli->trans_enc_state != NULL),
 838                                 rootcli->protocol,
 839                                 0,
 840                                 0x20))) {
 841                 return false;
 842         }
 843
 844         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 845                         &num_refs, &consumed) || !num_refs) {
 846                 return false;
 847         }
 848
 849         /* Just store the first referral for now. */
 850
 851         if (!refs[0].dfspath) {
 852                 return false;
 853         }
 854         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 855
 856         if (!server || !share) {
 857                 return false;
 858         }
 859
 860         /* Make sure to recreate the original string including any wildcards. */
 861
 862         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 863         if (!dfs_path) {
 864                 return false;
 865         }
 866         pathlen = strlen(dfs_path);
 867         consumed = MIN(pathlen, consumed);
 868         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 869         if (!*pp_targetpath) {
 870                 return false;
 871         }
 872         dfs_path[consumed] = '\0';
 873
 874         /*
 875          * *pp_targetpath is now the unconsumed part of the path.
 876          * dfs_path is now the consumed part of the path
 877          * (in \server\share\path format).
 878          */
 879
 880         /* Open the connection to the target server & share */
 881         if ((*targetcli = cli_cm_open(ctx, rootcli,
 882                                         server,
 883                                         share,
 884                                         dfs_auth_info,
 885                                         false,
 886                                         (rootcli->trans_enc_state != NULL),
 887                                         rootcli->protocol,
 888                                         0,
 889                                         0x20)) == NULL) {
 890                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 891                         server, share );
 892                 return false;
 893         }
 894
 895         if (extrapath && strlen(extrapath) > 0) {
 896                 *pp_targetpath = talloc_asprintf(ctx,
 897                                                 "%s%s",
 898                                                 extrapath,
 899                                                 *pp_targetpath);
 900                 if (!*pp_targetpath) {
 901                         return false;
 902                 }
 903         }
 904
 905         /* parse out the consumed mount path */
 906         /* trim off the \server\share\ */
 907
 908         ppath = dfs_path;
 909
 910         if (*ppath != '\\') {
 911                 d_printf("cli_resolve_path: "
 912                         "dfs_path (%s) not in correct format.\n",
 913                         dfs_path );
 914                 return false;
 915         }
 916
 917         ppath++; /* Now pointing at start of server name. */
 918
 919         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 920                 return false;
 921         }
 922
 923         ppath++; /* Now pointing at start of share name. */
 924
 925         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 926                 return false;
 927         }
 928
 929         ppath++; /* Now pointing at path component. */
 930
 931         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 932         if (!newmount) {
 933                 return false;
 934         }
 935
 936         cli_set_mntpoint(*targetcli, newmount);
 937
 938         /* Check for another dfs referral, note that we are not
 939            checking for loops here. */
 940
 941         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 942                 if (cli_resolve_path(ctx,
 943                                         newmount,
 944                                         dfs_auth_info,
 945                                         *targetcli,
 946                                         *pp_targetpath,
 947                                         &newcli,
 948                                         &newpath)) {
 949                         /*
 950                          * When cli_resolve_path returns true here it's always
 951                          * returning the complete path in newpath, so we're done
 952                          * here.
 953                          */
 954                         *targetcli = newcli;
 955                         *pp_targetpath = newpath;
 956                         return true;
 957                 }
 958         }
 959
 960   done:
 961
 962         /* If returning true ensure we return a dfs root full path. */
 963         if ((*targetcli)->dfsroot) {
 964                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 965                 if (!dfs_path) {
 966                         return false;
 967                 }
 968                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 969         }
 970
 971         return true;
 972 }
 973
 974 /********************************************************************
 975 ********************************************************************/
 976
 977 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 978                                 struct cli_state *cli,
 979                                 const char *sharename,
 980                                 char **pp_newserver,
 981                                 char **pp_newshare,
 982                                 bool force_encrypt,
 983                                 const char *username,
 984                                 const char *password,
 985                                 const char *domain)
 986 {
 987         CLIENT_DFS_REFERRAL *refs = NULL;
 988         size_t num_refs = 0;
 989         size_t consumed = 0;
 990         char *fullpath = NULL;
 991         bool res;
 992         uint16 cnum;
 993         char *newextrapath = NULL;
 994
 995         if (!cli || !sharename) {
 996                 return false;
 997         }
 998
 999         cnum = cli->cnum;
1000
1001         /* special case.  never check for a referral on the IPC$ share */
1002
1003         if (strequal(sharename, "IPC$")) {
1004                 return false;
1005         }
1006
1007         /* send a trans2_query_path_info to check for a referral */
1008
1009         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1010         if (!fullpath) {
1011                 return false;
1012         }
1013
1014         /* check for the referral */
1015
1016         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1017                 return false;
1018         }
1019
1020         if (force_encrypt) {
1021                 NTSTATUS status = cli_cm_force_encryption(cli,
1022                                         username,
1023                                         password,
1024                                         lp_workgroup(),
1025                                         "IPC$");
1026                 if (!NT_STATUS_IS_OK(status)) {
1027                         return false;
1028                 }
1029         }
1030
1031         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1032
1033         if (!cli_tdis(cli)) {
1034                 return false;
1035         }
1036
1037         cli->cnum = cnum;
1038
1039         if (!res || !num_refs) {
1040                 return false;
1041         }
1042
1043         if (!refs[0].dfspath) {
1044                 return false;
1045         }
1046
1047         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1048                         pp_newshare, &newextrapath );
1049
1050         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1051                 return false;
1052         }
1053
1054         /* check that this is not a self-referral */
1055
1056         if (strequal(cli->desthost, *pp_newserver) &&
1057                         strequal(sharename, *pp_newshare)) {
1058                 return false;
1059         }
1060
1061         return true;
1062 }