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 #include "auth/credentials/credentials.h"
  30
  31 /********************************************************************
  32  Important point.
  33
  34  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  35  are not C escaped here).
  36
  37  - but if we're using POSIX paths then <pathname> may contain
  38    '/' separators, not '\\' separators. So cope with '\\' or '/'
  39    as a separator when looking at the pathname part.... JRA.
  40 ********************************************************************/
  41
  42 /********************************************************************
  43  Ensure a connection is encrypted.
  44 ********************************************************************/
  45
  46 NTSTATUS cli_cm_force_encryption_creds(struct cli_state *c,
  47                                        struct cli_credentials *creds,
  48                                        const char *sharename)
  49 {
  50         uint16_t major, minor;
  51         uint32_t caplow, caphigh;
  52         NTSTATUS status;
  53
  54         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
  55                 status = smb2cli_session_encryption_on(c->smb2.session);
  56                 if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  57                         d_printf("Encryption required and "
  58                                 "server doesn't support "
  59                                 "SMB3 encryption - failing connect\n");
  60                 } else if (!NT_STATUS_IS_OK(status)) {
  61                         d_printf("Encryption required and "
  62                                 "setup failed with error %s.\n",
  63                                 nt_errstr(status));
  64                 }
  65                 return status;
  66         }
  67
  68         if (!SERVER_HAS_UNIX_CIFS(c)) {
  69                 d_printf("Encryption required and "
  70                         "server that doesn't support "
  71                         "UNIX extensions - failing connect\n");
  72                 return NT_STATUS_NOT_SUPPORTED;
  73         }
  74
  75         status = cli_unix_extensions_version(c, &major, &minor, &caplow,
  76                                              &caphigh);
  77         if (!NT_STATUS_IS_OK(status)) {
  78                 d_printf("Encryption required and "
  79                         "can't get UNIX CIFS extensions "
  80                         "version from server.\n");
  81                 return NT_STATUS_UNKNOWN_REVISION;
  82         }
  83
  84         if (!(caplow & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)) {
  85                 d_printf("Encryption required and "
  86                         "share %s doesn't support "
  87                         "encryption.\n", sharename);
  88                 return NT_STATUS_UNSUPPORTED_COMPRESSION;
  89         }
  90
  91         status = cli_smb1_setup_encryption(c, creds);
  92         if (!NT_STATUS_IS_OK(status)) {
  93                 d_printf("Encryption required and "
  94                         "setup failed with error %s.\n",
  95                         nt_errstr(status));
  96                 return status;
  97         }
  98
  99         return NT_STATUS_OK;
 100 }
 101
 102 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
 103                         const char *username,
 104                         const char *password,
 105                         const char *domain,
 106                         const char *sharename)
 107 {
 108         struct cli_credentials *creds = NULL;
 109         NTSTATUS status;
 110
 111         creds = cli_session_creds_init(c,
 112                                        username,
 113                                        domain,
 114                                        NULL, /* default realm */
 115                                        password,
 116                                        c->use_kerberos,
 117                                        c->fallback_after_kerberos,
 118                                        c->use_ccache,
 119                                        c->pw_nt_hash);
 120         if (creds == NULL) {
 121                 return NT_STATUS_NO_MEMORY;
 122         }
 123
 124         status = cli_cm_force_encryption_creds(c, creds, sharename);
 125         /* gensec currently references the creds so we can't free them here */
 126         talloc_unlink(c, creds);
 127         return status;
 128 }
 129
 130 /********************************************************************
 131  Return a connection to a server.
 132 ********************************************************************/
 133
 134 static NTSTATUS do_connect(TALLOC_CTX *ctx,
 135                                         const char *server,
 136                                         const struct sockaddr_storage *dest_ss,
 137                                         const char *share,
 138                                         const struct user_auth_info *auth_info,
 139                                         bool show_sessetup,
 140                                         bool force_encrypt,
 141                                         int max_protocol,
 142                                         int port,
 143                                         int name_type,
 144                                         struct cli_state **pcli)
 145 {
 146         struct cli_state *c = NULL;
 147         char *servicename;
 148         char *sharename;
 149         char *newserver, *newshare;
 150         NTSTATUS status;
 151         int flags = 0;
 152         enum protocol_types protocol = PROTOCOL_NONE;
 153         int signing_state = get_cmdline_auth_info_signing_state(auth_info);
 154         struct cli_credentials *creds = NULL;
 155
 156         if (force_encrypt) {
 157                 signing_state = SMB_SIGNING_REQUIRED;
 158         }
 159
 160         /* make a copy so we don't modify the global string 'service' */
 161         servicename = talloc_strdup(ctx,share);
 162         if (!servicename) {
 163                 return NT_STATUS_NO_MEMORY;
 164         }
 165         sharename = servicename;
 166         if (*sharename == '\\') {
 167                 sharename += 2;
 168                 if (server == NULL) {
 169                         server = sharename;
 170                 }
 171                 sharename = strchr_m(sharename,'\\');
 172                 if (!sharename) {
 173                         return NT_STATUS_NO_MEMORY;
 174                 }
 175                 *sharename = 0;
 176                 sharename++;
 177         }
 178         if (server == NULL) {
 179                 return NT_STATUS_INVALID_PARAMETER;
 180         }
 181
 182         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 183                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 184         }
 185         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 186                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 187         }
 188         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 189                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 190         }
 191         if (get_cmdline_auth_info_use_pw_nt_hash(auth_info)) {
 192                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 193         }
 194
 195         status = cli_connect_nb(
 196                 server, dest_ss, port, name_type, NULL,
 197                 signing_state,
 198                 flags, &c);
 199
 200         if (!NT_STATUS_IS_OK(status)) {
 201                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 202                         DBG_ERR("NetBIOS support disabled, unable to connect");
 203                 }
 204
 205                 DBG_WARNING("Connection to %s failed (Error %s)\n",
 206                             server,
 207                             nt_errstr(status));
 208                 return status;
 209         }
 210
 211         if (max_protocol == 0) {
 212                 max_protocol = PROTOCOL_LATEST;
 213         }
 214         DEBUG(4,(" session request ok\n"));
 215
 216         status = smbXcli_negprot(c->conn, c->timeout,
 217                                  lp_client_min_protocol(),
 218                                  max_protocol);
 219
 220         if (!NT_STATUS_IS_OK(status)) {
 221                 d_printf("protocol negotiation failed: %s\n",
 222                          nt_errstr(status));
 223                 cli_shutdown(c);
 224                 return status;
 225         }
 226         protocol = smbXcli_conn_protocol(c->conn);
 227         DEBUG(4,(" negotiated dialect[%s] against server[%s]\n",
 228                  smb_protocol_types_string(protocol),
 229                  smbXcli_conn_remote_name(c->conn)));
 230
 231         if (protocol >= PROTOCOL_SMB2_02) {
 232                 /* Ensure we ask for some initial credits. */
 233                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 234         }
 235
 236         creds = get_cmdline_auth_info_creds(auth_info);
 237
 238         status = cli_session_setup_creds(c, creds);
 239         if (!NT_STATUS_IS_OK(status)) {
 240                 /* If a password was not supplied then
 241                  * try again with a null username. */
 242                 if (force_encrypt || smbXcli_conn_signing_mandatory(c->conn) ||
 243                         cli_credentials_authentication_requested(creds) ||
 244                         cli_credentials_is_anonymous(creds) ||
 245                         !NT_STATUS_IS_OK(status = cli_session_setup_anon(c)))
 246                 {
 247                         d_printf("session setup failed: %s\n",
 248                                  nt_errstr(status));
 249                         if (NT_STATUS_EQUAL(status,
 250                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 251                                 d_printf("did you forget to run kinit?\n");
 252                         cli_shutdown(c);
 253                         return status;
 254                 }
 255                 d_printf("Anonymous login successful\n");
 256         }
 257
 258         if (!NT_STATUS_IS_OK(status)) {
 259                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 260                 cli_shutdown(c);
 261                 return status;
 262         }
 263
 264         if ( show_sessetup ) {
 265                 if (*c->server_domain) {
 266                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 267                                 c->server_domain,c->server_os,c->server_type));
 268                 } else if (*c->server_os || *c->server_type) {
 269                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 270                                  c->server_os,c->server_type));
 271                 }
 272         }
 273         DEBUG(4,(" session setup ok\n"));
 274
 275         /* here's the fun part....to support 'msdfs proxy' shares
 276            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 277            here before trying to connect to the original share.
 278            cli_check_msdfs_proxy() will fail if it is a normal share. */
 279
 280         if (smbXcli_conn_dfs_supported(c->conn) &&
 281                         cli_check_msdfs_proxy(ctx, c, sharename,
 282                                 &newserver, &newshare,
 283                                 force_encrypt, creds)) {
 284                 cli_shutdown(c);
 285                 return do_connect(ctx, newserver, NULL,
 286                                 newshare, auth_info, false,
 287                                 force_encrypt, max_protocol,
 288                                 port, name_type, pcli);
 289         }
 290
 291         /* must be a normal share */
 292
 293         status = cli_tree_connect_creds(c, sharename, "?????", creds);
 294         if (!NT_STATUS_IS_OK(status)) {
 295                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 296                 cli_shutdown(c);
 297                 return status;
 298         }
 299
 300         if (force_encrypt) {
 301                 status = cli_cm_force_encryption_creds(c,
 302                                                        creds,
 303                                                        sharename);
 304                 if (!NT_STATUS_IS_OK(status)) {
 305                         cli_shutdown(c);
 306                         return status;
 307                 }
 308         }
 309
 310         DEBUG(4,(" tconx ok\n"));
 311         *pcli = c;
 312         return NT_STATUS_OK;
 313 }
 314
 315 /****************************************************************************
 316 ****************************************************************************/
 317
 318 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 319 {
 320         TALLOC_CTX *frame = talloc_stackframe();
 321         char *name = clean_name(frame, mnt);
 322         if (!name) {
 323                 TALLOC_FREE(frame);
 324                 return;
 325         }
 326         TALLOC_FREE(cli->dfs_mountpoint);
 327         cli->dfs_mountpoint = talloc_strdup(cli, name);
 328         TALLOC_FREE(frame);
 329 }
 330
 331 /********************************************************************
 332  Add a new connection to the list.
 333  referring_cli == NULL means a new initial connection.
 334 ********************************************************************/
 335
 336 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 337                                struct cli_state *referring_cli,
 338                                const char *server,
 339                                const struct sockaddr_storage *dest_ss,
 340                                const char *share,
 341                                const struct user_auth_info *auth_info,
 342                                bool force_encrypt,
 343                                int max_protocol,
 344                                int port,
 345                                int name_type,
 346                                struct cli_state **pcli)
 347 {
 348         struct cli_state *cli;
 349         NTSTATUS status;
 350
 351         status = do_connect(ctx, server, dest_ss, share,
 352                                 auth_info,
 353                                 show_hdr, force_encrypt, max_protocol,
 354                                 port, name_type, &cli);
 355
 356         if (!NT_STATUS_IS_OK(status)) {
 357                 return status;
 358         }
 359
 360         /* Enter into the list. */
 361         if (referring_cli) {
 362                 DLIST_ADD_END(referring_cli, cli);
 363         }
 364
 365         if (referring_cli && referring_cli->requested_posix_capabilities) {
 366                 uint16_t major, minor;
 367                 uint32_t caplow, caphigh;
 368                 status = cli_unix_extensions_version(cli, &major, &minor,
 369                                                      &caplow, &caphigh);
 370                 if (NT_STATUS_IS_OK(status)) {
 371                         cli_set_unix_extensions_capabilities(cli,
 372                                         major, minor,
 373                                         caplow, caphigh);
 374                 }
 375         }
 376
 377         *pcli = cli;
 378         return NT_STATUS_OK;
 379 }
 380
 381 /********************************************************************
 382  Return a connection to a server on a particular share.
 383 ********************************************************************/
 384
 385 static struct cli_state *cli_cm_find(struct cli_state *cli,
 386                                 const char *server,
 387                                 const char *share)
 388 {
 389         struct cli_state *p;
 390
 391         if (cli == NULL) {
 392                 return NULL;
 393         }
 394
 395         /* Search to the start of the list. */
 396         for (p = cli; p; p = DLIST_PREV(p)) {
 397                 const char *remote_name =
 398                         smbXcli_conn_remote_name(p->conn);
 399
 400                 if (strequal(server, remote_name) &&
 401                                 strequal(share,p->share)) {
 402                         return p;
 403                 }
 404         }
 405
 406         /* Search to the end of the list. */
 407         for (p = cli->next; p; p = p->next) {
 408                 const char *remote_name =
 409                         smbXcli_conn_remote_name(p->conn);
 410
 411                 if (strequal(server, remote_name) &&
 412                                 strequal(share,p->share)) {
 413                         return p;
 414                 }
 415         }
 416
 417         return NULL;
 418 }
 419
 420 /****************************************************************************
 421  Open a client connection to a \\server\share.
 422 ****************************************************************************/
 423
 424 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 425                                 struct cli_state *referring_cli,
 426                                 const char *server,
 427                                 const char *share,
 428                                 const struct user_auth_info *auth_info,
 429                                 bool force_encrypt,
 430                                 int max_protocol,
 431                                 int port,
 432                                 int name_type,
 433                                 struct cli_state **pcli)
 434 {
 435         /* Try to reuse an existing connection in this list. */
 436         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 437         NTSTATUS status;
 438
 439         if (c) {
 440                 *pcli = c;
 441                 return NT_STATUS_OK;
 442         }
 443
 444         if (auth_info == NULL) {
 445                 /* Can't do a new connection
 446                  * without auth info. */
 447                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 448                         "without auth info\n",
 449                         server, share );
 450                 return NT_STATUS_INVALID_PARAMETER;
 451         }
 452
 453         status = cli_cm_connect(ctx,
 454                                 referring_cli,
 455                                 server,
 456                                 NULL,
 457                                 share,
 458                                 auth_info,
 459                                 force_encrypt,
 460                                 max_protocol,
 461                                 port,
 462                                 name_type,
 463                                 &c);
 464         if (!NT_STATUS_IS_OK(status)) {
 465                 return status;
 466         }
 467         *pcli = c;
 468         return NT_STATUS_OK;
 469 }
 470
 471 /****************************************************************************
 472 ****************************************************************************/
 473
 474 void cli_cm_display(struct cli_state *cli)
 475 {
 476         int i;
 477
 478         for (i=0; cli; cli = cli->next,i++ ) {
 479                 d_printf("%d:\tserver=%s, share=%s\n",
 480                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 481         }
 482 }
 483
 484 /****************************************************************************
 485 ****************************************************************************/
 486
 487 /****************************************************************************
 488 ****************************************************************************/
 489
 490 #if 0
 491 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 492 {
 493         SAFE_FREE(cm_creds.username);
 494         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 495                                                auth_info));
 496
 497         if (get_cmdline_auth_info_got_pass(auth_info)) {
 498                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 499         }
 500
 501         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 502         cm_creds.fallback_after_kerberos = false;
 503         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 504 }
 505 #endif
 506
 507 /**********************************************************************
 508  split a dfs path into the server, share name, and extrapath components
 509 **********************************************************************/
 510
 511 static bool split_dfs_path(TALLOC_CTX *ctx,
 512                                 const char *nodepath,
 513                                 char **pp_server,
 514                                 char **pp_share,
 515                                 char **pp_extrapath)
 516 {
 517         char *p, *q;
 518         char *path;
 519
 520         *pp_server = NULL;
 521         *pp_share = NULL;
 522         *pp_extrapath = NULL;
 523
 524         path = talloc_strdup(ctx, nodepath);
 525         if (!path) {
 526                 goto fail;
 527         }
 528
 529         if ( path[0] != '\\' ) {
 530                 goto fail;
 531         }
 532
 533         p = strchr_m( path + 1, '\\' );
 534         if ( !p ) {
 535                 goto fail;
 536         }
 537
 538         *p = '\0';
 539         p++;
 540
 541         /* Look for any extra/deep path */
 542         q = strchr_m(p, '\\');
 543         if (q != NULL) {
 544                 *q = '\0';
 545                 q++;
 546                 *pp_extrapath = talloc_strdup(ctx, q);
 547         } else {
 548                 *pp_extrapath = talloc_strdup(ctx, "");
 549         }
 550         if (*pp_extrapath == NULL) {
 551                 goto fail;
 552         }
 553
 554         *pp_share = talloc_strdup(ctx, p);
 555         if (*pp_share == NULL) {
 556                 goto fail;
 557         }
 558
 559         *pp_server = talloc_strdup(ctx, &path[1]);
 560         if (*pp_server == NULL) {
 561                 goto fail;
 562         }
 563
 564         TALLOC_FREE(path);
 565         return true;
 566
 567 fail:
 568         TALLOC_FREE(*pp_share);
 569         TALLOC_FREE(*pp_extrapath);
 570         TALLOC_FREE(path);
 571         return false;
 572 }
 573
 574 /****************************************************************************
 575  Return the original path truncated at the directory component before
 576  the first wildcard character. Trust the caller to provide a NULL
 577  terminated string
 578 ****************************************************************************/
 579
 580 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 581 {
 582         size_t len;
 583         char *p1, *p2, *p;
 584         char *path_out;
 585
 586         /* No absolute paths. */
 587         while (IS_DIRECTORY_SEP(*path)) {
 588                 path++;
 589         }
 590
 591         path_out = talloc_strdup(ctx, path);
 592         if (!path_out) {
 593                 return NULL;
 594         }
 595
 596         p1 = strchr_m(path_out, '*');
 597         p2 = strchr_m(path_out, '?');
 598
 599         if (p1 || p2) {
 600                 if (p1 && p2) {
 601                         p = MIN(p1,p2);
 602                 } else if (!p1) {
 603                         p = p2;
 604                 } else {
 605                         p = p1;
 606                 }
 607                 *p = '\0';
 608
 609                 /* Now go back to the start of this component. */
 610                 p1 = strrchr_m(path_out, '/');
 611                 p2 = strrchr_m(path_out, '\\');
 612                 p = MAX(p1,p2);
 613                 if (p) {
 614                         *p = '\0';
 615                 }
 616         }
 617
 618         /* Strip any trailing separator */
 619
 620         len = strlen(path_out);
 621         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 622                 path_out[len-1] = '\0';
 623         }
 624
 625         return path_out;
 626 }
 627
 628 /****************************************************************************
 629 ****************************************************************************/
 630
 631 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 632                                         struct cli_state *cli,
 633                                         const char *dir)
 634 {
 635         char path_sep = '\\';
 636
 637         /* Ensure the extrapath doesn't start with a separator. */
 638         while (IS_DIRECTORY_SEP(*dir)) {
 639                 dir++;
 640         }
 641
 642         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 643                 path_sep = '/';
 644         }
 645         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 646                         path_sep,
 647                         smbXcli_conn_remote_name(cli->conn),
 648                         path_sep,
 649                         cli->share,
 650                         path_sep,
 651                         dir);
 652 }
 653
 654 /********************************************************************
 655  check for dfs referral
 656 ********************************************************************/
 657
 658 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 659                                 NTSTATUS status)
 660 {
 661         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 662
 663         if (!(smbXcli_conn_use_unicode(cli->conn))) {
 664                 return false;
 665         }
 666         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 667                 return false;
 668         }
 669         if (NT_STATUS_EQUAL(status, expected)) {
 670                 return true;
 671         }
 672         return false;
 673 }
 674
 675 /********************************************************************
 676  Get the dfs referral link.
 677 ********************************************************************/
 678
 679 NTSTATUS cli_dfs_get_referral_ex(TALLOC_CTX *ctx,
 680                         struct cli_state *cli,
 681                         const char *path,
 682                         uint16_t max_referral_level,
 683                         struct client_dfs_referral **refs,
 684                         size_t *num_refs,
 685                         size_t *consumed)
 686 {
 687         unsigned int param_len = 0;
 688         uint16_t recv_flags2;
 689         uint8_t *param = NULL;
 690         uint8_t *rdata = NULL;
 691         char *p;
 692         char *endp;
 693         smb_ucs2_t *path_ucs;
 694         char *consumed_path = NULL;
 695         uint16_t consumed_ucs;
 696         uint16_t num_referrals;
 697         struct client_dfs_referral *referrals = NULL;
 698         NTSTATUS status;
 699         TALLOC_CTX *frame = talloc_stackframe();
 700
 701         *num_refs = 0;
 702         *refs = NULL;
 703
 704         param = talloc_array(talloc_tos(), uint8_t, 2);
 705         if (!param) {
 706                 status = NT_STATUS_NO_MEMORY;
 707                 goto out;
 708         }
 709         SSVAL(param, 0, max_referral_level);
 710
 711         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 712                                       path, strlen(path)+1,
 713                                       NULL);
 714         if (!param) {
 715                 status = NT_STATUS_NO_MEMORY;
 716                 goto out;
 717         }
 718         param_len = talloc_get_size(param);
 719         path_ucs = (smb_ucs2_t *)&param[2];
 720
 721         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
 722                 DATA_BLOB in_input_buffer;
 723                 DATA_BLOB in_output_buffer = data_blob_null;
 724                 DATA_BLOB out_input_buffer = data_blob_null;
 725                 DATA_BLOB out_output_buffer = data_blob_null;
 726
 727                 in_input_buffer.data = param;
 728                 in_input_buffer.length = param_len;
 729
 730                 status = smb2cli_ioctl(cli->conn,
 731                                        cli->timeout,
 732                                        cli->smb2.session,
 733                                        cli->smb2.tcon,
 734                                        UINT64_MAX, /* in_fid_persistent */
 735                                        UINT64_MAX, /* in_fid_volatile */
 736                                        FSCTL_DFS_GET_REFERRALS,
 737                                        0, /* in_max_input_length */
 738                                        &in_input_buffer,
 739                                        CLI_BUFFER_SIZE, /* in_max_output_length */
 740                                        &in_output_buffer,
 741                                        SMB2_IOCTL_FLAG_IS_FSCTL,
 742                                        talloc_tos(),
 743                                        &out_input_buffer,
 744                                        &out_output_buffer);
 745                 if (!NT_STATUS_IS_OK(status)) {
 746                         goto out;
 747                 }
 748
 749                 if (out_output_buffer.length < 4) {
 750                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 751                         goto out;
 752                 }
 753
 754                 recv_flags2 = FLAGS2_UNICODE_STRINGS;
 755                 rdata = out_output_buffer.data;
 756                 endp = (char *)rdata + out_output_buffer.length;
 757         } else {
 758                 unsigned int data_len = 0;
 759                 uint16_t setup[1];
 760
 761                 SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 762
 763                 status = cli_trans(talloc_tos(), cli, SMBtrans2,
 764                                    NULL, 0xffff, 0, 0,
 765                                    setup, 1, 0,
 766                                    param, param_len, 2,
 767                                    NULL, 0, CLI_BUFFER_SIZE,
 768                                    &recv_flags2,
 769                                    NULL, 0, NULL, /* rsetup */
 770                                    NULL, 0, NULL,
 771                                    &rdata, 4, &data_len);
 772                 if (!NT_STATUS_IS_OK(status)) {
 773                         goto out;
 774                 }
 775
 776                 endp = (char *)rdata + data_len;
 777         }
 778
 779         consumed_ucs  = SVAL(rdata, 0);
 780         num_referrals = SVAL(rdata, 2);
 781
 782         /* consumed_ucs is the number of bytes
 783          * of the UCS2 path consumed not counting any
 784          * terminating null. We need to convert
 785          * back to unix charset and count again
 786          * to get the number of bytes consumed from
 787          * the incoming path. */
 788
 789         errno = 0;
 790         if (pull_string_talloc(talloc_tos(),
 791                         NULL,
 792                         0,
 793                         &consumed_path,
 794                         path_ucs,
 795                         consumed_ucs,
 796                         STR_UNICODE) == 0) {
 797                 if (errno != 0) {
 798                         status = map_nt_error_from_unix(errno);
 799                 } else {
 800                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 801                 }
 802                 goto out;
 803         }
 804         if (consumed_path == NULL) {
 805                 status = map_nt_error_from_unix(errno);
 806                 goto out;
 807         }
 808         *consumed = strlen(consumed_path);
 809
 810         if (num_referrals != 0) {
 811                 uint16_t ref_version;
 812                 uint16_t ref_size;
 813                 int i;
 814                 uint16_t node_offset;
 815
 816                 referrals = talloc_array(ctx, struct client_dfs_referral,
 817                                          num_referrals);
 818
 819                 if (!referrals) {
 820                         status = NT_STATUS_NO_MEMORY;
 821                         goto out;
 822                 }
 823                 /* start at the referrals array */
 824
 825                 p = (char *)rdata+8;
 826                 for (i=0; i<num_referrals && p < endp; i++) {
 827                         if (p + 18 > endp) {
 828                                 goto out;
 829                         }
 830                         ref_version = SVAL(p, 0);
 831                         ref_size    = SVAL(p, 2);
 832                         node_offset = SVAL(p, 16);
 833
 834                         if (ref_version != 3) {
 835                                 p += ref_size;
 836                                 continue;
 837                         }
 838
 839                         referrals[i].proximity = SVAL(p, 8);
 840                         referrals[i].ttl       = SVAL(p, 10);
 841
 842                         if (p + node_offset > endp) {
 843                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 844                                 goto out;
 845                         }
 846                         clistr_pull_talloc(referrals,
 847                                            (const char *)rdata,
 848                                            recv_flags2,
 849                                            &referrals[i].dfspath,
 850                                            p+node_offset,
 851                                            PTR_DIFF(endp, p+node_offset),
 852                                            STR_TERMINATE|STR_UNICODE);
 853
 854                         if (!referrals[i].dfspath) {
 855                                 status = map_nt_error_from_unix(errno);
 856                                 goto out;
 857                         }
 858                         p += ref_size;
 859                 }
 860                 if (i < num_referrals) {
 861                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 862                         goto out;
 863                 }
 864         }
 865
 866         *num_refs = num_referrals;
 867         *refs = referrals;
 868
 869   out:
 870
 871         TALLOC_FREE(frame);
 872         return status;
 873 }
 874
 875 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 876                         struct cli_state *cli,
 877                         const char *path,
 878                         struct client_dfs_referral **refs,
 879                         size_t *num_refs,
 880                         size_t *consumed)
 881 {
 882         return cli_dfs_get_referral_ex(ctx,
 883                                 cli,
 884                                 path,
 885                                 3,
 886                                 refs, /* Max referral level we want */
 887                                 num_refs,
 888                                 consumed);
 889 }
 890
 891 /********************************************************************
 892 ********************************************************************/
 893 struct cli_dfs_path_split {
 894         char *server;
 895         char *share;
 896         char *extrapath;
 897 };
 898
 899 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 900                           const char *mountpt,
 901                           const struct user_auth_info *dfs_auth_info,
 902                           struct cli_state *rootcli,
 903                           const char *path,
 904                           struct cli_state **targetcli,
 905                           char **pp_targetpath)
 906 {
 907         struct client_dfs_referral *refs = NULL;
 908         size_t num_refs = 0;
 909         size_t consumed = 0;
 910         struct cli_state *cli_ipc = NULL;
 911         char *dfs_path = NULL;
 912         char *cleanpath = NULL;
 913         char *extrapath = NULL;
 914         int pathlen;
 915         struct cli_state *newcli = NULL;
 916         struct cli_state *ccli = NULL;
 917         int count = 0;
 918         char *newpath = NULL;
 919         char *newmount = NULL;
 920         char *ppath = NULL;
 921         SMB_STRUCT_STAT sbuf;
 922         uint32_t attributes;
 923         NTSTATUS status;
 924         struct cli_credentials *dfs_creds = NULL;
 925         bool force_encryption = true;
 926         struct smbXcli_tcon *root_tcon = NULL;
 927         struct smbXcli_tcon *target_tcon = NULL;
 928         struct cli_dfs_path_split *dfs_refs = NULL;
 929
 930         if ( !rootcli || !path || !targetcli ) {
 931                 return NT_STATUS_INVALID_PARAMETER;
 932         }
 933
 934         /* Don't do anything if this is not a DFS root. */
 935
 936         if (smbXcli_conn_protocol(rootcli->conn) >= PROTOCOL_SMB2_02) {
 937                 root_tcon = rootcli->smb2.tcon;
 938                 force_encryption = smb2cli_tcon_is_encryption_on(root_tcon);
 939         } else {
 940                 root_tcon = rootcli->smb1.tcon;
 941                 force_encryption = smb1cli_conn_encryption_on(rootcli->conn);
 942         }
 943
 944         /*
 945          * Avoid more than one leading directory separator
 946          */
 947         while (IS_DIRECTORY_SEP(path[0]) && IS_DIRECTORY_SEP(path[1])) {
 948                 path++;
 949         }
 950
 951         if (!smbXcli_tcon_is_dfs_share(root_tcon)) {
 952                 *targetcli = rootcli;
 953                 *pp_targetpath = talloc_strdup(ctx, path);
 954                 if (!*pp_targetpath) {
 955                         return NT_STATUS_NO_MEMORY;
 956                 }
 957                 return NT_STATUS_OK;
 958         }
 959
 960         *targetcli = NULL;
 961
 962         /* Send a trans2_query_path_info to check for a referral. */
 963
 964         cleanpath = clean_path(ctx, path);
 965         if (!cleanpath) {
 966                 return NT_STATUS_NO_MEMORY;
 967         }
 968
 969         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 970         if (!dfs_path) {
 971                 return NT_STATUS_NO_MEMORY;
 972         }
 973
 974         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 975         if (NT_STATUS_IS_OK(status)) {
 976                 /* This is an ordinary path, just return it. */
 977                 *targetcli = rootcli;
 978                 *pp_targetpath = talloc_strdup(ctx, path);
 979                 if (!*pp_targetpath) {
 980                         return NT_STATUS_NO_MEMORY;
 981                 }
 982                 goto done;
 983         }
 984
 985         /* Special case where client asked for a path that does not exist */
 986
 987         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 988                                 status)) {
 989                 *targetcli = rootcli;
 990                 *pp_targetpath = talloc_strdup(ctx, path);
 991                 if (!*pp_targetpath) {
 992                         return NT_STATUS_NO_MEMORY;
 993                 }
 994                 goto done;
 995         }
 996
 997         /* We got an error, check for DFS referral. */
 998
 999         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
1000                                  status)) {
1001                 return status;
1002         }
1003
1004         /* Check for the referral. */
1005
1006         cli_ipc = cli_state_dup(ctx, rootcli);
1007         if (cli_ipc == NULL) {
1008                 return NT_STATUS_NO_MEMORY;
1009         }
1010
1011         dfs_creds = get_cmdline_auth_info_creds(auth_info);
1012
1013         status = cli_tree_connect_creds(cli_ipc, "IPC$", "IPC", dfs_creds);
1014         if (!NT_STATUS_IS_OK(status)) {
1015                 d_printf("tree connect failed: %s\n", nt_errstr(status));
1016                 cli_shutdown(cli_ipc);
1017                 return status;
1018         }
1019
1020         if (force_encrypt) {
1021                 status = cli_cm_force_encryption_creds(cli_ipc,
1022                                                        dfs_creds,
1023                                                        "IPC$");
1024                 if (!NT_STATUS_IS_OK(status)) {
1025                         cli_shutdown(cli_ipc);
1026                         return status;
1027                 }
1028         }
1029
1030         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
1031                                       &num_refs, &consumed);
1032         if (!NT_STATUS_IS_OK(status)) {
1033                 return status;
1034         }
1035
1036         if (!num_refs || !refs[0].dfspath) {
1037                 return NT_STATUS_NOT_FOUND;
1038         }
1039
1040         /*
1041          * Bug#10123 - DFS referal entries can be provided in a random order,
1042          * so check the connection cache for each item to avoid unnecessary
1043          * reconnections.
1044          */
1045         dfs_refs = talloc_array(ctx, struct cli_dfs_path_split, num_refs);
1046         if (dfs_refs == NULL) {
1047                 return NT_STATUS_NO_MEMORY;
1048         }
1049
1050         for (count = 0; count < num_refs; count++) {
1051                 if (!split_dfs_path(dfs_refs, refs[count].dfspath,
1052                                     &dfs_refs[count].server,
1053                                     &dfs_refs[count].share,
1054                                     &dfs_refs[count].extrapath)) {
1055                         TALLOC_FREE(dfs_refs);
1056                         return NT_STATUS_NOT_FOUND;
1057                 }
1058
1059                 ccli = cli_cm_find(rootcli, dfs_refs[count].server,
1060                                    dfs_refs[count].share);
1061                 if (ccli != NULL) {
1062                         extrapath = dfs_refs[count].extrapath;
1063                         *targetcli = ccli;
1064                         break;
1065                 }
1066         }
1067
1068         /*
1069          * If no cached connection was found, then connect to the first live
1070          * referral server in the list.
1071          */
1072         for (count = 0; (ccli == NULL) && (count < num_refs); count++) {
1073                 /* Connect to the target server & share */
1074                 status = cli_cm_connect(ctx, rootcli,
1075                                 dfs_refs[count].server,
1076                                 NULL,
1077                                 dfs_refs[count].share,
1078                                 dfs_auth_info,
1079                                 cli_state_is_encryption_on(rootcli),
1080                                 smbXcli_conn_protocol(rootcli->conn),
1081                                 0,
1082                                 0x20,
1083                                 targetcli);
1084                 if (!NT_STATUS_IS_OK(status)) {
1085                         d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
1086                                  dfs_refs[count].server,
1087                                  dfs_refs[count].share);
1088                         continue;
1089                 } else {
1090                         extrapath = dfs_refs[count].extrapath;
1091                         break;
1092                 }
1093         }
1094
1095         /* No available referral server for the connection */
1096         if (*targetcli == NULL) {
1097                 TALLOC_FREE(dfs_refs);
1098                 return status;
1099         }
1100
1101         /* Make sure to recreate the original string including any wildcards. */
1102
1103         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
1104         if (!dfs_path) {
1105                 TALLOC_FREE(dfs_refs);
1106                 return NT_STATUS_NO_MEMORY;
1107         }
1108         pathlen = strlen(dfs_path);
1109         consumed = MIN(pathlen, consumed);
1110         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
1111         if (!*pp_targetpath) {
1112                 TALLOC_FREE(dfs_refs);
1113                 return NT_STATUS_NO_MEMORY;
1114         }
1115         dfs_path[consumed] = '\0';
1116
1117         /*
1118          * *pp_targetpath is now the unconsumed part of the path.
1119          * dfs_path is now the consumed part of the path
1120          * (in \server\share\path format).
1121          */
1122
1123         if (extrapath && strlen(extrapath) > 0) {
1124                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
1125                 /* put the trailing \ on the path, so to be save we put one in if needed */
1126                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
1127                         *pp_targetpath = talloc_asprintf(ctx,
1128                                                   "%s\\%s",
1129                                                   extrapath,
1130                                                   *pp_targetpath);
1131                 } else {
1132                         *pp_targetpath = talloc_asprintf(ctx,
1133                                                   "%s%s",
1134                                                   extrapath,
1135                                                   *pp_targetpath);
1136                 }
1137                 if (!*pp_targetpath) {
1138                         TALLOC_FREE(dfs_refs);
1139                         return NT_STATUS_NO_MEMORY;
1140                 }
1141         }
1142
1143         /* parse out the consumed mount path */
1144         /* trim off the \server\share\ */
1145
1146         ppath = dfs_path;
1147
1148         if (*ppath != '\\') {
1149                 d_printf("cli_resolve_path: "
1150                         "dfs_path (%s) not in correct format.\n",
1151                         dfs_path );
1152                 TALLOC_FREE(dfs_refs);
1153                 return NT_STATUS_NOT_FOUND;
1154         }
1155
1156         ppath++; /* Now pointing at start of server name. */
1157
1158         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
1159                 TALLOC_FREE(dfs_refs);
1160                 return NT_STATUS_NOT_FOUND;
1161         }
1162
1163         ppath++; /* Now pointing at start of share name. */
1164
1165         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1166                 TALLOC_FREE(dfs_refs);
1167                 return NT_STATUS_NOT_FOUND;
1168         }
1169
1170         ppath++; /* Now pointing at path component. */
1171
1172         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1173         if (!newmount) {
1174                 TALLOC_FREE(dfs_refs);
1175                 return NT_STATUS_NOT_FOUND;
1176         }
1177
1178         cli_set_mntpoint(*targetcli, newmount);
1179
1180         /* Check for another dfs referral, note that we are not
1181            checking for loops here. */
1182
1183         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1184                 status = cli_resolve_path(ctx,
1185                                           newmount,
1186                                           dfs_auth_info,
1187                                           *targetcli,
1188                                           *pp_targetpath,
1189                                           &newcli,
1190                                           &newpath);
1191                 if (NT_STATUS_IS_OK(status)) {
1192                         /*
1193                          * When cli_resolve_path returns true here it's always
1194                          * returning the complete path in newpath, so we're done
1195                          * here.
1196                          */
1197                         *targetcli = newcli;
1198                         *pp_targetpath = newpath;
1199                         TALLOC_FREE(dfs_refs);
1200                         return status;
1201                 }
1202         }
1203
1204   done:
1205
1206         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1207                 target_tcon = (*targetcli)->smb2.tcon;
1208         } else {
1209                 target_tcon = (*targetcli)->smb1.tcon;
1210         }
1211
1212         /* If returning true ensure we return a dfs root full path. */
1213         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1214                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1215                 if (!dfs_path) {
1216                         TALLOC_FREE(dfs_refs);
1217                         return NT_STATUS_NO_MEMORY;
1218                 }
1219                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1220                 if (*pp_targetpath == NULL) {
1221                         TALLOC_FREE(dfs_refs);
1222                         return NT_STATUS_NO_MEMORY;
1223                 }
1224         }
1225
1226         TALLOC_FREE(dfs_refs);
1227         return NT_STATUS_OK;
1228 }
1229
1230 /********************************************************************
1231 ********************************************************************/
1232
1233 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1234                                 struct cli_state *cli,
1235                                 const char *sharename,
1236                                 char **pp_newserver,
1237                                 char **pp_newshare,
1238                                 bool force_encrypt,
1239                                 struct cli_credentials *creds)
1240 {
1241         struct client_dfs_referral *refs = NULL;
1242         size_t num_refs = 0;
1243         size_t consumed = 0;
1244         char *fullpath = NULL;
1245         bool res;
1246         struct smbXcli_tcon *orig_tcon = NULL;
1247         char *newextrapath = NULL;
1248         NTSTATUS status;
1249         const char *remote_name;
1250
1251         if (!cli || !sharename) {
1252                 return false;
1253         }
1254
1255         remote_name = smbXcli_conn_remote_name(cli->conn);
1256
1257         /* special case.  never check for a referral on the IPC$ share */
1258
1259         if (strequal(sharename, "IPC$")) {
1260                 return false;
1261         }
1262
1263         /* send a trans2_query_path_info to check for a referral */
1264
1265         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1266         if (!fullpath) {
1267                 return false;
1268         }
1269
1270         /* Store tcon state. */
1271         if (cli_state_has_tcon(cli)) {
1272                 orig_tcon = cli_state_save_tcon(cli);
1273                 if (orig_tcon == NULL) {
1274                         return false;
1275                 }
1276         }
1277
1278         /* check for the referral */
1279
1280         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
1281                 cli_state_restore_tcon(cli, orig_tcon);
1282                 return false;
1283         }
1284
1285         if (force_encrypt) {
1286                 status = cli_cm_force_encryption_creds(cli, creds, "IPC$");
1287                 if (!NT_STATUS_IS_OK(status)) {
1288                         cli_state_restore_tcon(cli, orig_tcon);
1289                         return false;
1290                 }
1291         }
1292
1293         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1294                                       &num_refs, &consumed);
1295         res = NT_STATUS_IS_OK(status);
1296
1297         status = cli_tdis(cli);
1298
1299         cli_state_restore_tcon(cli, orig_tcon);
1300
1301         if (!NT_STATUS_IS_OK(status)) {
1302                 return false;
1303         }
1304
1305         if (!res || !num_refs) {
1306                 return false;
1307         }
1308
1309         if (!refs[0].dfspath) {
1310                 return false;
1311         }
1312
1313         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1314                             pp_newshare, &newextrapath)) {
1315                 return false;
1316         }
1317
1318         /* check that this is not a self-referral */
1319
1320         if (strequal(remote_name, *pp_newserver) &&
1321                         strequal(sharename, *pp_newshare)) {
1322                 return false;
1323         }
1324
1325         return true;
1326 }