source3/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6    Copyright (C) Jeremy Allison                   2007-2009
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libsmb/libsmb.h"
  24 #include "libsmb/clirap.h"
  25 #include "msdfs.h"
  26 #include "trans2.h"
  27 #include "libsmb/nmblib.h"
  28 #include "../libcli/smb/smbXcli_base.h"
  29
  30 /********************************************************************
  31  Important point.
  32
  33  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  34  are not C escaped here).
  35
  36  - but if we're using POSIX paths then <pathname> may contain
  37    '/' separators, not '\\' separators. So cope with '\\' or '/'
  38    as a separator when looking at the pathname part.... JRA.
  39 ********************************************************************/
  40
  41 /********************************************************************
  42  Ensure a connection is encrypted.
  43 ********************************************************************/
  44
  45 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  46                         const char *username,
  47                         const char *password,
  48                         const char *domain,
  49                         const char *sharename)
  50 {
  51         NTSTATUS status = cli_force_encryption(c,
  52                                         username,
  53                                         password,
  54                                         domain);
  55
  56         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  57                 d_printf("Encryption required and "
  58                         "server that doesn't support "
  59                         "UNIX extensions - failing connect\n");
  60         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  61                 d_printf("Encryption required and "
  62                         "can't get UNIX CIFS extensions "
  63                         "version from server.\n");
  64         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  65                 d_printf("Encryption required and "
  66                         "share %s doesn't support "
  67                         "encryption.\n", sharename);
  68         } else if (!NT_STATUS_IS_OK(status)) {
  69                 d_printf("Encryption required and "
  70                         "setup failed with error %s.\n",
  71                         nt_errstr(status));
  72         }
  73
  74         return status;
  75 }
  76
  77 /********************************************************************
  78  Return a connection to a server.
  79 ********************************************************************/
  80
  81 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  82                                         const char *server,
  83                                         const char *share,
  84                                         const struct user_auth_info *auth_info,
  85                                         bool show_sessetup,
  86                                         bool force_encrypt,
  87                                         int max_protocol,
  88                                         int port,
  89                                         int name_type,
  90                                         struct cli_state **pcli)
  91 {
  92         struct cli_state *c = NULL;
  93         char *servicename;
  94         char *sharename;
  95         char *newserver, *newshare;
  96         const char *username;
  97         const char *password;
  98         NTSTATUS status;
  99         int flags = 0;
 100
 101         /* make a copy so we don't modify the global string 'service' */
 102         servicename = talloc_strdup(ctx,share);
 103         if (!servicename) {
 104                 return NT_STATUS_NO_MEMORY;
 105         }
 106         sharename = servicename;
 107         if (*sharename == '\\') {
 108                 sharename += 2;
 109                 if (server == NULL) {
 110                         server = sharename;
 111                 }
 112                 sharename = strchr_m(sharename,'\\');
 113                 if (!sharename) {
 114                         return NT_STATUS_NO_MEMORY;
 115                 }
 116                 *sharename = 0;
 117                 sharename++;
 118         }
 119         if (server == NULL) {
 120                 return NT_STATUS_INVALID_PARAMETER;
 121         }
 122
 123         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 124                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 125         }
 126         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 127                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 128         }
 129         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 130                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 131         }
 132
 133         status = cli_connect_nb(
 134                 server, NULL, port, name_type, NULL,
 135                 get_cmdline_auth_info_signing_state(auth_info),
 136                 flags, &c);
 137
 138         if (!NT_STATUS_IS_OK(status)) {
 139                 d_printf("Connection to %s failed (Error %s)\n",
 140                                 server,
 141                                 nt_errstr(status));
 142                 return status;
 143         }
 144
 145         if (max_protocol == 0) {
 146                 max_protocol = PROTOCOL_NT1;
 147         }
 148         DEBUG(4,(" session request ok\n"));
 149
 150         status = cli_negprot(c, max_protocol);
 151
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 d_printf("protocol negotiation failed: %s\n",
 154                          nt_errstr(status));
 155                 cli_shutdown(c);
 156                 return status;
 157         }
 158
 159         username = get_cmdline_auth_info_username(auth_info);
 160         password = get_cmdline_auth_info_password(auth_info);
 161
 162         status = cli_session_setup(c, username,
 163                                    password, strlen(password),
 164                                    password, strlen(password),
 165                                    lp_workgroup());
 166         if (!NT_STATUS_IS_OK(status)) {
 167                 /* If a password was not supplied then
 168                  * try again with a null username. */
 169                 if (password[0] || !username[0] ||
 170                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 171                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 172                                                 "", 0,
 173                                                 "", 0,
 174                                                lp_workgroup()))) {
 175                         d_printf("session setup failed: %s\n",
 176                                  nt_errstr(status));
 177                         if (NT_STATUS_EQUAL(status,
 178                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 179                                 d_printf("did you forget to run kinit?\n");
 180                         cli_shutdown(c);
 181                         return status;
 182                 }
 183                 d_printf("Anonymous login successful\n");
 184                 status = cli_init_creds(c, "", lp_workgroup(), "");
 185         } else {
 186                 status = cli_init_creds(c, username, lp_workgroup(), password);
 187         }
 188
 189         if (!NT_STATUS_IS_OK(status)) {
 190                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 191                 cli_shutdown(c);
 192                 return status;
 193         }
 194
 195         if ( show_sessetup ) {
 196                 if (*c->server_domain) {
 197                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 198                                 c->server_domain,c->server_os,c->server_type));
 199                 } else if (*c->server_os || *c->server_type) {
 200                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 201                                  c->server_os,c->server_type));
 202                 }
 203         }
 204         DEBUG(4,(" session setup ok\n"));
 205
 206         /* here's the fun part....to support 'msdfs proxy' shares
 207            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 208            here before trying to connect to the original share.
 209            cli_check_msdfs_proxy() will fail if it is a normal share. */
 210
 211         if ((cli_state_capabilities(c) & CAP_DFS) &&
 212                         cli_check_msdfs_proxy(ctx, c, sharename,
 213                                 &newserver, &newshare,
 214                                 force_encrypt,
 215                                 username,
 216                                 password,
 217                                 lp_workgroup())) {
 218                 cli_shutdown(c);
 219                 return do_connect(ctx, newserver,
 220                                 newshare, auth_info, false,
 221                                 force_encrypt, max_protocol,
 222                                 port, name_type, pcli);
 223         }
 224
 225         /* must be a normal share */
 226
 227         status = cli_tree_connect(c, sharename, "?????",
 228                                   password, strlen(password)+1);
 229         if (!NT_STATUS_IS_OK(status)) {
 230                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 231                 cli_shutdown(c);
 232                 return status;
 233         }
 234
 235         if (force_encrypt) {
 236                 status = cli_cm_force_encryption(c,
 237                                         username,
 238                                         password,
 239                                         lp_workgroup(),
 240                                         sharename);
 241                 if (!NT_STATUS_IS_OK(status)) {
 242                         cli_shutdown(c);
 243                         return status;
 244                 }
 245         }
 246
 247         DEBUG(4,(" tconx ok\n"));
 248         *pcli = c;
 249         return NT_STATUS_OK;
 250 }
 251
 252 /****************************************************************************
 253 ****************************************************************************/
 254
 255 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 256 {
 257         char *name = clean_name(NULL, mnt);
 258         if (!name) {
 259                 return;
 260         }
 261         TALLOC_FREE(cli->dfs_mountpoint);
 262         cli->dfs_mountpoint = talloc_strdup(cli, name);
 263         TALLOC_FREE(name);
 264 }
 265
 266 /********************************************************************
 267  Add a new connection to the list.
 268  referring_cli == NULL means a new initial connection.
 269 ********************************************************************/
 270
 271 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 272                                struct cli_state *referring_cli,
 273                                const char *server,
 274                                const char *share,
 275                                const struct user_auth_info *auth_info,
 276                                bool show_hdr,
 277                                bool force_encrypt,
 278                                int max_protocol,
 279                                int port,
 280                                int name_type,
 281                                struct cli_state **pcli)
 282 {
 283         struct cli_state *cli;
 284         NTSTATUS status;
 285
 286         status = do_connect(ctx, server, share,
 287                                 auth_info,
 288                                 show_hdr, force_encrypt, max_protocol,
 289                                 port, name_type, &cli);
 290
 291         if (!NT_STATUS_IS_OK(status)) {
 292                 return status;
 293         }
 294
 295         /* Enter into the list. */
 296         if (referring_cli) {
 297                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 298         }
 299
 300         if (referring_cli && referring_cli->requested_posix_capabilities) {
 301                 uint16 major, minor;
 302                 uint32 caplow, caphigh;
 303                 status = cli_unix_extensions_version(cli, &major, &minor,
 304                                                      &caplow, &caphigh);
 305                 if (NT_STATUS_IS_OK(status)) {
 306                         cli_set_unix_extensions_capabilities(cli,
 307                                         major, minor,
 308                                         caplow, caphigh);
 309                 }
 310         }
 311
 312         *pcli = cli;
 313         return NT_STATUS_OK;
 314 }
 315
 316 /********************************************************************
 317  Return a connection to a server on a particular share.
 318 ********************************************************************/
 319
 320 static struct cli_state *cli_cm_find(struct cli_state *cli,
 321                                 const char *server,
 322                                 const char *share)
 323 {
 324         struct cli_state *p;
 325
 326         if (cli == NULL) {
 327                 return NULL;
 328         }
 329
 330         /* Search to the start of the list. */
 331         for (p = cli; p; p = DLIST_PREV(p)) {
 332                 const char *remote_name =
 333                         smbXcli_conn_remote_name(p->conn);
 334
 335                 if (strequal(server, remote_name) &&
 336                                 strequal(share,p->share)) {
 337                         return p;
 338                 }
 339         }
 340
 341         /* Search to the end of the list. */
 342         for (p = cli->next; p; p = p->next) {
 343                 const char *remote_name =
 344                         smbXcli_conn_remote_name(p->conn);
 345
 346                 if (strequal(server, remote_name) &&
 347                                 strequal(share,p->share)) {
 348                         return p;
 349                 }
 350         }
 351
 352         return NULL;
 353 }
 354
 355 /****************************************************************************
 356  Open a client connection to a \\server\share.
 357 ****************************************************************************/
 358
 359 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 360                                 struct cli_state *referring_cli,
 361                                 const char *server,
 362                                 const char *share,
 363                                 const struct user_auth_info *auth_info,
 364                                 bool show_hdr,
 365                                 bool force_encrypt,
 366                                 int max_protocol,
 367                                 int port,
 368                                 int name_type,
 369                                 struct cli_state **pcli)
 370 {
 371         /* Try to reuse an existing connection in this list. */
 372         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 373         NTSTATUS status;
 374
 375         if (c) {
 376                 *pcli = c;
 377                 return NT_STATUS_OK;
 378         }
 379
 380         if (auth_info == NULL) {
 381                 /* Can't do a new connection
 382                  * without auth info. */
 383                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 384                         "without auth info\n",
 385                         server, share );
 386                 return NT_STATUS_INVALID_PARAMETER;
 387         }
 388
 389         status = cli_cm_connect(ctx,
 390                                 referring_cli,
 391                                 server,
 392                                 share,
 393                                 auth_info,
 394                                 show_hdr,
 395                                 force_encrypt,
 396                                 max_protocol,
 397                                 port,
 398                                 name_type,
 399                                 &c);
 400         if (!NT_STATUS_IS_OK(status)) {
 401                 return status;
 402         }
 403         *pcli = c;
 404         return NT_STATUS_OK;
 405 }
 406
 407 /****************************************************************************
 408 ****************************************************************************/
 409
 410 void cli_cm_display(struct cli_state *cli)
 411 {
 412         int i;
 413
 414         for (i=0; cli; cli = cli->next,i++ ) {
 415                 d_printf("%d:\tserver=%s, share=%s\n",
 416                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 417         }
 418 }
 419
 420 /****************************************************************************
 421 ****************************************************************************/
 422
 423 /****************************************************************************
 424 ****************************************************************************/
 425
 426 #if 0
 427 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 428 {
 429         SAFE_FREE(cm_creds.username);
 430         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 431                                                auth_info));
 432
 433         if (get_cmdline_auth_info_got_pass(auth_info)) {
 434                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 435         }
 436
 437         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 438         cm_creds.fallback_after_kerberos = false;
 439         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 440 }
 441 #endif
 442
 443 /**********************************************************************
 444  split a dfs path into the server, share name, and extrapath components
 445 **********************************************************************/
 446
 447 static bool split_dfs_path(TALLOC_CTX *ctx,
 448                                 const char *nodepath,
 449                                 char **pp_server,
 450                                 char **pp_share,
 451                                 char **pp_extrapath)
 452 {
 453         char *p, *q;
 454         char *path;
 455
 456         *pp_server = NULL;
 457         *pp_share = NULL;
 458         *pp_extrapath = NULL;
 459
 460         path = talloc_strdup(ctx, nodepath);
 461         if (!path) {
 462                 goto fail;
 463         }
 464
 465         if ( path[0] != '\\' ) {
 466                 goto fail;
 467         }
 468
 469         p = strchr_m( path + 1, '\\' );
 470         if ( !p ) {
 471                 goto fail;
 472         }
 473
 474         *p = '\0';
 475         p++;
 476
 477         /* Look for any extra/deep path */
 478         q = strchr_m(p, '\\');
 479         if (q != NULL) {
 480                 *q = '\0';
 481                 q++;
 482                 *pp_extrapath = talloc_strdup(ctx, q);
 483         } else {
 484                 *pp_extrapath = talloc_strdup(ctx, "");
 485         }
 486         if (*pp_extrapath == NULL) {
 487                 goto fail;
 488         }
 489
 490         *pp_share = talloc_strdup(ctx, p);
 491         if (*pp_share == NULL) {
 492                 goto fail;
 493         }
 494
 495         *pp_server = talloc_strdup(ctx, &path[1]);
 496         if (*pp_server == NULL) {
 497                 goto fail;
 498         }
 499
 500         TALLOC_FREE(path);
 501         return true;
 502
 503 fail:
 504         TALLOC_FREE(*pp_share);
 505         TALLOC_FREE(*pp_extrapath);
 506         TALLOC_FREE(path);
 507         return false;
 508 }
 509
 510 /****************************************************************************
 511  Return the original path truncated at the directory component before
 512  the first wildcard character. Trust the caller to provide a NULL
 513  terminated string
 514 ****************************************************************************/
 515
 516 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 517 {
 518         size_t len;
 519         char *p1, *p2, *p;
 520         char *path_out;
 521
 522         /* No absolute paths. */
 523         while (IS_DIRECTORY_SEP(*path)) {
 524                 path++;
 525         }
 526
 527         path_out = talloc_strdup(ctx, path);
 528         if (!path_out) {
 529                 return NULL;
 530         }
 531
 532         p1 = strchr_m(path_out, '*');
 533         p2 = strchr_m(path_out, '?');
 534
 535         if (p1 || p2) {
 536                 if (p1 && p2) {
 537                         p = MIN(p1,p2);
 538                 } else if (!p1) {
 539                         p = p2;
 540                 } else {
 541                         p = p1;
 542                 }
 543                 *p = '\0';
 544
 545                 /* Now go back to the start of this component. */
 546                 p1 = strrchr_m(path_out, '/');
 547                 p2 = strrchr_m(path_out, '\\');
 548                 p = MAX(p1,p2);
 549                 if (p) {
 550                         *p = '\0';
 551                 }
 552         }
 553
 554         /* Strip any trailing separator */
 555
 556         len = strlen(path_out);
 557         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 558                 path_out[len-1] = '\0';
 559         }
 560
 561         return path_out;
 562 }
 563
 564 /****************************************************************************
 565 ****************************************************************************/
 566
 567 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 568                                         struct cli_state *cli,
 569                                         const char *dir)
 570 {
 571         char path_sep = '\\';
 572
 573         /* Ensure the extrapath doesn't start with a separator. */
 574         while (IS_DIRECTORY_SEP(*dir)) {
 575                 dir++;
 576         }
 577
 578         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 579                 path_sep = '/';
 580         }
 581         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 582                         path_sep,
 583                         smbXcli_conn_remote_name(cli->conn),
 584                         path_sep,
 585                         cli->share,
 586                         path_sep,
 587                         dir);
 588 }
 589
 590 /********************************************************************
 591  check for dfs referral
 592 ********************************************************************/
 593
 594 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 595                                 NTSTATUS status)
 596 {
 597         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 598
 599         if (!(cli_state_capabilities(cli) & CAP_UNICODE)) {
 600                 return false;
 601         }
 602         if (!(cli_state_capabilities(cli) & CAP_STATUS32)) {
 603                 return false;
 604         }
 605         if (NT_STATUS_EQUAL(status, expected)) {
 606                 return true;
 607         }
 608         return false;
 609 }
 610
 611 /********************************************************************
 612  Get the dfs referral link.
 613 ********************************************************************/
 614
 615 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 616                         struct cli_state *cli,
 617                         const char *path,
 618                         struct client_dfs_referral **refs,
 619                         size_t *num_refs,
 620                         size_t *consumed)
 621 {
 622         unsigned int data_len = 0;
 623         unsigned int param_len = 0;
 624         uint16_t setup[1];
 625         uint16_t recv_flags2;
 626         uint8_t *param = NULL;
 627         uint8_t *rdata = NULL;
 628         char *p;
 629         char *endp;
 630         smb_ucs2_t *path_ucs;
 631         char *consumed_path = NULL;
 632         uint16_t consumed_ucs;
 633         uint16 num_referrals;
 634         struct client_dfs_referral *referrals = NULL;
 635         NTSTATUS status;
 636         TALLOC_CTX *frame = talloc_stackframe();
 637
 638         *num_refs = 0;
 639         *refs = NULL;
 640
 641         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 642
 643         param = talloc_array(talloc_tos(), uint8_t, 2);
 644         if (!param) {
 645                 status = NT_STATUS_NO_MEMORY;
 646                 goto out;
 647         }
 648         SSVAL(param, 0, 0x03);  /* max referral level */
 649
 650         param = trans2_bytes_push_str(param, cli_ucs2(cli),
 651                                       path, strlen(path)+1,
 652                                       NULL);
 653         if (!param) {
 654                 status = NT_STATUS_NO_MEMORY;
 655                 goto out;
 656         }
 657         param_len = talloc_get_size(param);
 658         path_ucs = (smb_ucs2_t *)&param[2];
 659
 660         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 661                            NULL, 0xffff, 0, 0,
 662                            setup, 1, 0,
 663                            param, param_len, 2,
 664                            NULL, 0, CLI_BUFFER_SIZE,
 665                            &recv_flags2,
 666                            NULL, 0, NULL, /* rsetup */
 667                            NULL, 0, NULL,
 668                            &rdata, 4, &data_len);
 669         if (!NT_STATUS_IS_OK(status)) {
 670                 goto out;
 671         }
 672
 673         endp = (char *)rdata + data_len;
 674
 675         consumed_ucs  = SVAL(rdata, 0);
 676         num_referrals = SVAL(rdata, 2);
 677
 678         /* consumed_ucs is the number of bytes
 679          * of the UCS2 path consumed not counting any
 680          * terminating null. We need to convert
 681          * back to unix charset and count again
 682          * to get the number of bytes consumed from
 683          * the incoming path. */
 684
 685         errno = 0;
 686         if (pull_string_talloc(talloc_tos(),
 687                         NULL,
 688                         0,
 689                         &consumed_path,
 690                         path_ucs,
 691                         consumed_ucs,
 692                         STR_UNICODE) == 0) {
 693                 if (errno != 0) {
 694                         status = map_nt_error_from_unix(errno);
 695                 } else {
 696                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 697                 }
 698                 goto out;
 699         }
 700         if (consumed_path == NULL) {
 701                 status = map_nt_error_from_unix(errno);
 702                 goto out;
 703         }
 704         *consumed = strlen(consumed_path);
 705
 706         if (num_referrals != 0) {
 707                 uint16 ref_version;
 708                 uint16 ref_size;
 709                 int i;
 710                 uint16 node_offset;
 711
 712                 referrals = talloc_array(ctx, struct client_dfs_referral,
 713                                          num_referrals);
 714
 715                 if (!referrals) {
 716                         status = NT_STATUS_NO_MEMORY;
 717                         goto out;
 718                 }
 719                 /* start at the referrals array */
 720
 721                 p = (char *)rdata+8;
 722                 for (i=0; i<num_referrals && p < endp; i++) {
 723                         if (p + 18 > endp) {
 724                                 goto out;
 725                         }
 726                         ref_version = SVAL(p, 0);
 727                         ref_size    = SVAL(p, 2);
 728                         node_offset = SVAL(p, 16);
 729
 730                         if (ref_version != 3) {
 731                                 p += ref_size;
 732                                 continue;
 733                         }
 734
 735                         referrals[i].proximity = SVAL(p, 8);
 736                         referrals[i].ttl       = SVAL(p, 10);
 737
 738                         if (p + node_offset > endp) {
 739                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 740                                 goto out;
 741                         }
 742                         clistr_pull_talloc(referrals,
 743                                            (const char *)rdata,
 744                                            recv_flags2,
 745                                            &referrals[i].dfspath,
 746                                            p+node_offset,
 747                                            PTR_DIFF(endp, p+node_offset),
 748                                            STR_TERMINATE|STR_UNICODE);
 749
 750                         if (!referrals[i].dfspath) {
 751                                 status = map_nt_error_from_unix(errno);
 752                                 goto out;
 753                         }
 754                         p += ref_size;
 755                 }
 756                 if (i < num_referrals) {
 757                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 758                         goto out;
 759                 }
 760         }
 761
 762         *num_refs = num_referrals;
 763         *refs = referrals;
 764
 765   out:
 766
 767         TALLOC_FREE(frame);
 768         return status;
 769 }
 770
 771 /********************************************************************
 772 ********************************************************************/
 773
 774 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 775                           const char *mountpt,
 776                           const struct user_auth_info *dfs_auth_info,
 777                           struct cli_state *rootcli,
 778                           const char *path,
 779                           struct cli_state **targetcli,
 780                           char **pp_targetpath)
 781 {
 782         struct client_dfs_referral *refs = NULL;
 783         size_t num_refs = 0;
 784         size_t consumed = 0;
 785         struct cli_state *cli_ipc = NULL;
 786         char *dfs_path = NULL;
 787         char *cleanpath = NULL;
 788         char *extrapath = NULL;
 789         int pathlen;
 790         char *server = NULL;
 791         char *share = NULL;
 792         struct cli_state *newcli = NULL;
 793         char *newpath = NULL;
 794         char *newmount = NULL;
 795         char *ppath = NULL;
 796         SMB_STRUCT_STAT sbuf;
 797         uint32 attributes;
 798         NTSTATUS status;
 799
 800         if ( !rootcli || !path || !targetcli ) {
 801                 return NT_STATUS_INVALID_PARAMETER;
 802         }
 803
 804         /* Don't do anything if this is not a DFS root. */
 805
 806         if ( !rootcli->dfsroot) {
 807                 *targetcli = rootcli;
 808                 *pp_targetpath = talloc_strdup(ctx, path);
 809                 if (!*pp_targetpath) {
 810                         return NT_STATUS_NO_MEMORY;
 811                 }
 812                 return NT_STATUS_OK;
 813         }
 814
 815         *targetcli = NULL;
 816
 817         /* Send a trans2_query_path_info to check for a referral. */
 818
 819         cleanpath = clean_path(ctx, path);
 820         if (!cleanpath) {
 821                 return NT_STATUS_NO_MEMORY;
 822         }
 823
 824         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 825         if (!dfs_path) {
 826                 return NT_STATUS_NO_MEMORY;
 827         }
 828
 829         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 830         if (NT_STATUS_IS_OK(status)) {
 831                 /* This is an ordinary path, just return it. */
 832                 *targetcli = rootcli;
 833                 *pp_targetpath = talloc_strdup(ctx, path);
 834                 if (!*pp_targetpath) {
 835                         return NT_STATUS_NO_MEMORY;
 836                 }
 837                 goto done;
 838         }
 839
 840         /* Special case where client asked for a path that does not exist */
 841
 842         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 843                                 status)) {
 844                 *targetcli = rootcli;
 845                 *pp_targetpath = talloc_strdup(ctx, path);
 846                 if (!*pp_targetpath) {
 847                         return NT_STATUS_NO_MEMORY;
 848                 }
 849                 goto done;
 850         }
 851
 852         /* We got an error, check for DFS referral. */
 853
 854         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 855                                  status)) {
 856                 return status;
 857         }
 858
 859         /* Check for the referral. */
 860
 861         status = cli_cm_open(ctx,
 862                              rootcli,
 863                              smbXcli_conn_remote_name(rootcli->conn),
 864                              "IPC$",
 865                              dfs_auth_info,
 866                              false,
 867                              cli_state_encryption_on(rootcli),
 868                              cli_state_protocol(rootcli),
 869                              0,
 870                              0x20,
 871                              &cli_ipc);
 872         if (!NT_STATUS_IS_OK(status)) {
 873                 return status;
 874         }
 875
 876         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 877                                       &num_refs, &consumed);
 878         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 879                 return status;
 880         }
 881
 882         /* Just store the first referral for now. */
 883
 884         if (!refs[0].dfspath) {
 885                 return NT_STATUS_NOT_FOUND;
 886         }
 887         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 888                             &extrapath)) {
 889                 return NT_STATUS_NOT_FOUND;
 890         }
 891
 892         /* Make sure to recreate the original string including any wildcards. */
 893
 894         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 895         if (!dfs_path) {
 896                 return NT_STATUS_NO_MEMORY;
 897         }
 898         pathlen = strlen(dfs_path);
 899         consumed = MIN(pathlen, consumed);
 900         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 901         if (!*pp_targetpath) {
 902                 return NT_STATUS_NO_MEMORY;
 903         }
 904         dfs_path[consumed] = '\0';
 905
 906         /*
 907          * *pp_targetpath is now the unconsumed part of the path.
 908          * dfs_path is now the consumed part of the path
 909          * (in \server\share\path format).
 910          */
 911
 912         /* Open the connection to the target server & share */
 913         status = cli_cm_open(ctx, rootcli,
 914                              server,
 915                              share,
 916                              dfs_auth_info,
 917                              false,
 918                              cli_state_encryption_on(rootcli),
 919                              cli_state_protocol(rootcli),
 920                              0,
 921                              0x20,
 922                              targetcli);
 923         if (!NT_STATUS_IS_OK(status)) {
 924                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 925                         server, share );
 926                 return status;
 927         }
 928
 929         if (extrapath && strlen(extrapath) > 0) {
 930                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 931                 /* put the trailing \ on the path, so to be save we put one in if needed */
 932                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 933                         *pp_targetpath = talloc_asprintf(ctx,
 934                                                   "%s\\%s",
 935                                                   extrapath,
 936                                                   *pp_targetpath);
 937                 } else {
 938                         *pp_targetpath = talloc_asprintf(ctx,
 939                                                   "%s%s",
 940                                                   extrapath,
 941                                                   *pp_targetpath);
 942                 }
 943                 if (!*pp_targetpath) {
 944                         return NT_STATUS_NO_MEMORY;
 945                 }
 946         }
 947
 948         /* parse out the consumed mount path */
 949         /* trim off the \server\share\ */
 950
 951         ppath = dfs_path;
 952
 953         if (*ppath != '\\') {
 954                 d_printf("cli_resolve_path: "
 955                         "dfs_path (%s) not in correct format.\n",
 956                         dfs_path );
 957                 return NT_STATUS_NOT_FOUND;
 958         }
 959
 960         ppath++; /* Now pointing at start of server name. */
 961
 962         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 963                 return NT_STATUS_NOT_FOUND;
 964         }
 965
 966         ppath++; /* Now pointing at start of share name. */
 967
 968         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 969                 return NT_STATUS_NOT_FOUND;
 970         }
 971
 972         ppath++; /* Now pointing at path component. */
 973
 974         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 975         if (!newmount) {
 976                 return NT_STATUS_NOT_FOUND;
 977         }
 978
 979         cli_set_mntpoint(*targetcli, newmount);
 980
 981         /* Check for another dfs referral, note that we are not
 982            checking for loops here. */
 983
 984         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 985                 status = cli_resolve_path(ctx,
 986                                           newmount,
 987                                           dfs_auth_info,
 988                                           *targetcli,
 989                                           *pp_targetpath,
 990                                           &newcli,
 991                                           &newpath);
 992                 if (NT_STATUS_IS_OK(status)) {
 993                         /*
 994                          * When cli_resolve_path returns true here it's always
 995                          * returning the complete path in newpath, so we're done
 996                          * here.
 997                          */
 998                         *targetcli = newcli;
 999                         *pp_targetpath = newpath;
1000                         return status;
1001                 }
1002         }
1003
1004   done:
1005
1006         /* If returning true ensure we return a dfs root full path. */
1007         if ((*targetcli)->dfsroot) {
1008                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1009                 if (!dfs_path) {
1010                         return NT_STATUS_NO_MEMORY;
1011                 }
1012                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1013                 if (*pp_targetpath == NULL) {
1014                         return NT_STATUS_NO_MEMORY;
1015                 }
1016         }
1017
1018         return NT_STATUS_OK;
1019 }
1020
1021 /********************************************************************
1022 ********************************************************************/
1023
1024 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1025                                 struct cli_state *cli,
1026                                 const char *sharename,
1027                                 char **pp_newserver,
1028                                 char **pp_newshare,
1029                                 bool force_encrypt,
1030                                 const char *username,
1031                                 const char *password,
1032                                 const char *domain)
1033 {
1034         struct client_dfs_referral *refs = NULL;
1035         size_t num_refs = 0;
1036         size_t consumed = 0;
1037         char *fullpath = NULL;
1038         bool res;
1039         uint16 cnum;
1040         char *newextrapath = NULL;
1041         NTSTATUS status;
1042         const char *remote_name;
1043
1044         if (!cli || !sharename) {
1045                 return false;
1046         }
1047
1048         remote_name = smbXcli_conn_remote_name(cli->conn);
1049         cnum = cli_state_get_tid(cli);
1050
1051         /* special case.  never check for a referral on the IPC$ share */
1052
1053         if (strequal(sharename, "IPC$")) {
1054                 return false;
1055         }
1056
1057         /* send a trans2_query_path_info to check for a referral */
1058
1059         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1060         if (!fullpath) {
1061                 return false;
1062         }
1063
1064         /* check for the referral */
1065
1066         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL, 0))) {
1067                 return false;
1068         }
1069
1070         if (force_encrypt) {
1071                 status = cli_cm_force_encryption(cli,
1072                                         username,
1073                                         password,
1074                                         lp_workgroup(),
1075                                         "IPC$");
1076                 if (!NT_STATUS_IS_OK(status)) {
1077                         return false;
1078                 }
1079         }
1080
1081         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1082                                       &num_refs, &consumed);
1083         res = NT_STATUS_IS_OK(status);
1084
1085         status = cli_tdis(cli);
1086         if (!NT_STATUS_IS_OK(status)) {
1087                 return false;
1088         }
1089
1090         cli_state_set_tid(cli, cnum);
1091
1092         if (!res || !num_refs) {
1093                 return false;
1094         }
1095
1096         if (!refs[0].dfspath) {
1097                 return false;
1098         }
1099
1100         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1101                             pp_newshare, &newextrapath)) {
1102                 return false;
1103         }
1104
1105         /* check that this is not a self-referral */
1106
1107         if (strequal(remote_name, *pp_newserver) &&
1108                         strequal(sharename, *pp_newshare)) {
1109                 return false;
1110         }
1111
1112         return true;
1113 }