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