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                 const char *server_name = NULL;
 266                 enum protocol_types protocol;
 267                 const char *protocol_name = NULL;
 268
 269                 server_name = smbXcli_conn_remote_name(c->conn);
 270                 protocol = smbXcli_conn_protocol(c->conn);
 271                 protocol_name = smb_protocol_types_string(protocol);
 272
 273                 DEBUG(0,("Server=[%s] Protocol=[%s]\n",
 274                          server_name, protocol_name));
 275         }
 276         DEBUG(4,(" session setup ok\n"));
 277
 278         /* here's the fun part....to support 'msdfs proxy' shares
 279            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 280            here before trying to connect to the original share.
 281            cli_check_msdfs_proxy() will fail if it is a normal share. */
 282
 283         if (smbXcli_conn_dfs_supported(c->conn) &&
 284                         cli_check_msdfs_proxy(ctx, c, sharename,
 285                                 &newserver, &newshare,
 286                                 force_encrypt, creds)) {
 287                 cli_shutdown(c);
 288                 return do_connect(ctx, newserver, NULL,
 289                                 newshare, auth_info, false,
 290                                 force_encrypt, max_protocol,
 291                                 port, name_type, pcli);
 292         }
 293
 294         /* must be a normal share */
 295
 296         status = cli_tree_connect_creds(c, sharename, "?????", creds);
 297         if (!NT_STATUS_IS_OK(status)) {
 298                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 299                 cli_shutdown(c);
 300                 return status;
 301         }
 302
 303         if (force_encrypt) {
 304                 status = cli_cm_force_encryption_creds(c,
 305                                                        creds,
 306                                                        sharename);
 307                 if (!NT_STATUS_IS_OK(status)) {
 308                         cli_shutdown(c);
 309                         return status;
 310                 }
 311         }
 312
 313         DEBUG(4,(" tconx ok\n"));
 314         *pcli = c;
 315         return NT_STATUS_OK;
 316 }
 317
 318 /****************************************************************************
 319 ****************************************************************************/
 320
 321 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 322 {
 323         TALLOC_CTX *frame = talloc_stackframe();
 324         char *name = clean_name(frame, mnt);
 325         if (!name) {
 326                 TALLOC_FREE(frame);
 327                 return;
 328         }
 329         TALLOC_FREE(cli->dfs_mountpoint);
 330         cli->dfs_mountpoint = talloc_strdup(cli, name);
 331         TALLOC_FREE(frame);
 332 }
 333
 334 /********************************************************************
 335  Add a new connection to the list.
 336  referring_cli == NULL means a new initial connection.
 337 ********************************************************************/
 338
 339 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 340                                struct cli_state *referring_cli,
 341                                const char *server,
 342                                const struct sockaddr_storage *dest_ss,
 343                                const char *share,
 344                                const struct user_auth_info *auth_info,
 345                                bool force_encrypt,
 346                                int max_protocol,
 347                                int port,
 348                                int name_type,
 349                                struct cli_state **pcli)
 350 {
 351         struct cli_state *cli;
 352         NTSTATUS status;
 353
 354         status = do_connect(ctx, server, dest_ss, share,
 355                                 auth_info,
 356                                 show_hdr, force_encrypt, max_protocol,
 357                                 port, name_type, &cli);
 358
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 return status;
 361         }
 362
 363         /* Enter into the list. */
 364         if (referring_cli) {
 365                 DLIST_ADD_END(referring_cli, cli);
 366         }
 367
 368         if (referring_cli && referring_cli->requested_posix_capabilities) {
 369                 uint16_t major, minor;
 370                 uint32_t caplow, caphigh;
 371                 status = cli_unix_extensions_version(cli, &major, &minor,
 372                                                      &caplow, &caphigh);
 373                 if (NT_STATUS_IS_OK(status)) {
 374                         cli_set_unix_extensions_capabilities(cli,
 375                                         major, minor,
 376                                         caplow, caphigh);
 377                 }
 378         }
 379
 380         *pcli = cli;
 381         return NT_STATUS_OK;
 382 }
 383
 384 /********************************************************************
 385  Return a connection to a server on a particular share.
 386 ********************************************************************/
 387
 388 static struct cli_state *cli_cm_find(struct cli_state *cli,
 389                                 const char *server,
 390                                 const char *share)
 391 {
 392         struct cli_state *p;
 393
 394         if (cli == NULL) {
 395                 return NULL;
 396         }
 397
 398         /* Search to the start of the list. */
 399         for (p = cli; p; p = DLIST_PREV(p)) {
 400                 const char *remote_name =
 401                         smbXcli_conn_remote_name(p->conn);
 402
 403                 if (strequal(server, remote_name) &&
 404                                 strequal(share,p->share)) {
 405                         return p;
 406                 }
 407         }
 408
 409         /* Search to the end of the list. */
 410         for (p = cli->next; p; p = p->next) {
 411                 const char *remote_name =
 412                         smbXcli_conn_remote_name(p->conn);
 413
 414                 if (strequal(server, remote_name) &&
 415                                 strequal(share,p->share)) {
 416                         return p;
 417                 }
 418         }
 419
 420         return NULL;
 421 }
 422
 423 /****************************************************************************
 424  Open a client connection to a \\server\share.
 425 ****************************************************************************/
 426
 427 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 428                                 struct cli_state *referring_cli,
 429                                 const char *server,
 430                                 const struct sockaddr_storage *dest_ss,
 431                                 const char *share,
 432                                 const struct user_auth_info *auth_info,
 433                                 bool force_encrypt,
 434                                 int max_protocol,
 435                                 int port,
 436                                 int name_type,
 437                                 struct cli_state **pcli)
 438 {
 439         /* Try to reuse an existing connection in this list. */
 440         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 441         NTSTATUS status;
 442
 443         if (c) {
 444                 *pcli = c;
 445                 return NT_STATUS_OK;
 446         }
 447
 448         if (auth_info == NULL) {
 449                 /* Can't do a new connection
 450                  * without auth info. */
 451                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 452                         "without auth info\n",
 453                         server, share );
 454                 return NT_STATUS_INVALID_PARAMETER;
 455         }
 456
 457         status = cli_cm_connect(ctx,
 458                                 referring_cli,
 459                                 server,
 460                                 dest_ss,
 461                                 share,
 462                                 auth_info,
 463                                 force_encrypt,
 464                                 max_protocol,
 465                                 port,
 466                                 name_type,
 467                                 &c);
 468         if (!NT_STATUS_IS_OK(status)) {
 469                 return status;
 470         }
 471         *pcli = c;
 472         return NT_STATUS_OK;
 473 }
 474
 475 /****************************************************************************
 476 ****************************************************************************/
 477
 478 void cli_cm_display(struct cli_state *cli)
 479 {
 480         int i;
 481
 482         for (i=0; cli; cli = cli->next,i++ ) {
 483                 d_printf("%d:\tserver=%s, share=%s\n",
 484                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 485         }
 486 }
 487
 488 /****************************************************************************
 489 ****************************************************************************/
 490
 491 /****************************************************************************
 492 ****************************************************************************/
 493
 494 #if 0
 495 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 496 {
 497         SAFE_FREE(cm_creds.username);
 498         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 499                                                auth_info));
 500
 501         if (get_cmdline_auth_info_got_pass(auth_info)) {
 502                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 503         }
 504
 505         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 506         cm_creds.fallback_after_kerberos = false;
 507         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 508 }
 509 #endif
 510
 511 /**********************************************************************
 512  split a dfs path into the server, share name, and extrapath components
 513 **********************************************************************/
 514
 515 static bool split_dfs_path(TALLOC_CTX *ctx,
 516                                 const char *nodepath,
 517                                 char **pp_server,
 518                                 char **pp_share,
 519                                 char **pp_extrapath)
 520 {
 521         char *p, *q;
 522         char *path;
 523
 524         *pp_server = NULL;
 525         *pp_share = NULL;
 526         *pp_extrapath = NULL;
 527
 528         path = talloc_strdup(ctx, nodepath);
 529         if (!path) {
 530                 goto fail;
 531         }
 532
 533         if ( path[0] != '\\' ) {
 534                 goto fail;
 535         }
 536
 537         p = strchr_m( path + 1, '\\' );
 538         if ( !p ) {
 539                 goto fail;
 540         }
 541
 542         *p = '\0';
 543         p++;
 544
 545         /* Look for any extra/deep path */
 546         q = strchr_m(p, '\\');
 547         if (q != NULL) {
 548                 *q = '\0';
 549                 q++;
 550                 *pp_extrapath = talloc_strdup(ctx, q);
 551         } else {
 552                 *pp_extrapath = talloc_strdup(ctx, "");
 553         }
 554         if (*pp_extrapath == NULL) {
 555                 goto fail;
 556         }
 557
 558         *pp_share = talloc_strdup(ctx, p);
 559         if (*pp_share == NULL) {
 560                 goto fail;
 561         }
 562
 563         *pp_server = talloc_strdup(ctx, &path[1]);
 564         if (*pp_server == NULL) {
 565                 goto fail;
 566         }
 567
 568         TALLOC_FREE(path);
 569         return true;
 570
 571 fail:
 572         TALLOC_FREE(*pp_share);
 573         TALLOC_FREE(*pp_extrapath);
 574         TALLOC_FREE(path);
 575         return false;
 576 }
 577
 578 /****************************************************************************
 579  Return the original path truncated at the directory component before
 580  the first wildcard character. Trust the caller to provide a NULL
 581  terminated string
 582 ****************************************************************************/
 583
 584 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 585 {
 586         size_t len;
 587         char *p1, *p2, *p;
 588         char *path_out;
 589
 590         /* No absolute paths. */
 591         while (IS_DIRECTORY_SEP(*path)) {
 592                 path++;
 593         }
 594
 595         path_out = talloc_strdup(ctx, path);
 596         if (!path_out) {
 597                 return NULL;
 598         }
 599
 600         p1 = strchr_m(path_out, '*');
 601         p2 = strchr_m(path_out, '?');
 602
 603         if (p1 || p2) {
 604                 if (p1 && p2) {
 605                         p = MIN(p1,p2);
 606                 } else if (!p1) {
 607                         p = p2;
 608                 } else {
 609                         p = p1;
 610                 }
 611                 *p = '\0';
 612
 613                 /* Now go back to the start of this component. */
 614                 p1 = strrchr_m(path_out, '/');
 615                 p2 = strrchr_m(path_out, '\\');
 616                 p = MAX(p1,p2);
 617                 if (p) {
 618                         *p = '\0';
 619                 }
 620         }
 621
 622         /* Strip any trailing separator */
 623
 624         len = strlen(path_out);
 625         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 626                 path_out[len-1] = '\0';
 627         }
 628
 629         return path_out;
 630 }
 631
 632 /****************************************************************************
 633 ****************************************************************************/
 634
 635 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 636                                         struct cli_state *cli,
 637                                         const char *dir)
 638 {
 639         char path_sep = '\\';
 640
 641         /* Ensure the extrapath doesn't start with a separator. */
 642         while (IS_DIRECTORY_SEP(*dir)) {
 643                 dir++;
 644         }
 645
 646         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 647                 path_sep = '/';
 648         }
 649         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 650                         path_sep,
 651                         smbXcli_conn_remote_name(cli->conn),
 652                         path_sep,
 653                         cli->share,
 654                         path_sep,
 655                         dir);
 656 }
 657
 658 /********************************************************************
 659  check for dfs referral
 660 ********************************************************************/
 661
 662 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 663                                 NTSTATUS status)
 664 {
 665         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 666
 667         if (!(smbXcli_conn_use_unicode(cli->conn))) {
 668                 return false;
 669         }
 670         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 671                 return false;
 672         }
 673         if (NT_STATUS_EQUAL(status, expected)) {
 674                 return true;
 675         }
 676         return false;
 677 }
 678
 679 /********************************************************************
 680  Get the dfs referral link.
 681 ********************************************************************/
 682
 683 NTSTATUS cli_dfs_get_referral_ex(TALLOC_CTX *ctx,
 684                         struct cli_state *cli,
 685                         const char *path,
 686                         uint16_t max_referral_level,
 687                         struct client_dfs_referral **refs,
 688                         size_t *num_refs,
 689                         size_t *consumed)
 690 {
 691         unsigned int param_len = 0;
 692         uint16_t recv_flags2;
 693         uint8_t *param = NULL;
 694         uint8_t *rdata = NULL;
 695         char *p;
 696         char *endp;
 697         smb_ucs2_t *path_ucs;
 698         char *consumed_path = NULL;
 699         uint16_t consumed_ucs;
 700         uint16_t num_referrals;
 701         struct client_dfs_referral *referrals = NULL;
 702         NTSTATUS status;
 703         TALLOC_CTX *frame = talloc_stackframe();
 704
 705         *num_refs = 0;
 706         *refs = NULL;
 707
 708         param = talloc_array(talloc_tos(), uint8_t, 2);
 709         if (!param) {
 710                 status = NT_STATUS_NO_MEMORY;
 711                 goto out;
 712         }
 713         SSVAL(param, 0, max_referral_level);
 714
 715         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 716                                       path, strlen(path)+1,
 717                                       NULL);
 718         if (!param) {
 719                 status = NT_STATUS_NO_MEMORY;
 720                 goto out;
 721         }
 722         param_len = talloc_get_size(param);
 723         path_ucs = (smb_ucs2_t *)&param[2];
 724
 725         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
 726                 DATA_BLOB in_input_buffer;
 727                 DATA_BLOB in_output_buffer = data_blob_null;
 728                 DATA_BLOB out_input_buffer = data_blob_null;
 729                 DATA_BLOB out_output_buffer = data_blob_null;
 730
 731                 in_input_buffer.data = param;
 732                 in_input_buffer.length = param_len;
 733
 734                 status = smb2cli_ioctl(cli->conn,
 735                                        cli->timeout,
 736                                        cli->smb2.session,
 737                                        cli->smb2.tcon,
 738                                        UINT64_MAX, /* in_fid_persistent */
 739                                        UINT64_MAX, /* in_fid_volatile */
 740                                        FSCTL_DFS_GET_REFERRALS,
 741                                        0, /* in_max_input_length */
 742                                        &in_input_buffer,
 743                                        CLI_BUFFER_SIZE, /* in_max_output_length */
 744                                        &in_output_buffer,
 745                                        SMB2_IOCTL_FLAG_IS_FSCTL,
 746                                        talloc_tos(),
 747                                        &out_input_buffer,
 748                                        &out_output_buffer);
 749                 if (!NT_STATUS_IS_OK(status)) {
 750                         goto out;
 751                 }
 752
 753                 if (out_output_buffer.length < 4) {
 754                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 755                         goto out;
 756                 }
 757
 758                 recv_flags2 = FLAGS2_UNICODE_STRINGS;
 759                 rdata = out_output_buffer.data;
 760                 endp = (char *)rdata + out_output_buffer.length;
 761         } else {
 762                 unsigned int data_len = 0;
 763                 uint16_t setup[1];
 764
 765                 SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 766
 767                 status = cli_trans(talloc_tos(), cli, SMBtrans2,
 768                                    NULL, 0xffff, 0, 0,
 769                                    setup, 1, 0,
 770                                    param, param_len, 2,
 771                                    NULL, 0, CLI_BUFFER_SIZE,
 772                                    &recv_flags2,
 773                                    NULL, 0, NULL, /* rsetup */
 774                                    NULL, 0, NULL,
 775                                    &rdata, 4, &data_len);
 776                 if (!NT_STATUS_IS_OK(status)) {
 777                         goto out;
 778                 }
 779
 780                 endp = (char *)rdata + data_len;
 781         }
 782
 783         consumed_ucs  = SVAL(rdata, 0);
 784         num_referrals = SVAL(rdata, 2);
 785
 786         /* consumed_ucs is the number of bytes
 787          * of the UCS2 path consumed not counting any
 788          * terminating null. We need to convert
 789          * back to unix charset and count again
 790          * to get the number of bytes consumed from
 791          * the incoming path. */
 792
 793         errno = 0;
 794         if (pull_string_talloc(talloc_tos(),
 795                         NULL,
 796                         0,
 797                         &consumed_path,
 798                         path_ucs,
 799                         consumed_ucs,
 800                         STR_UNICODE) == 0) {
 801                 if (errno != 0) {
 802                         status = map_nt_error_from_unix(errno);
 803                 } else {
 804                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 805                 }
 806                 goto out;
 807         }
 808         if (consumed_path == NULL) {
 809                 status = map_nt_error_from_unix(errno);
 810                 goto out;
 811         }
 812         *consumed = strlen(consumed_path);
 813
 814         if (num_referrals != 0) {
 815                 uint16_t ref_version;
 816                 uint16_t ref_size;
 817                 int i;
 818                 uint16_t node_offset;
 819
 820                 referrals = talloc_array(ctx, struct client_dfs_referral,
 821                                          num_referrals);
 822
 823                 if (!referrals) {
 824                         status = NT_STATUS_NO_MEMORY;
 825                         goto out;
 826                 }
 827                 /* start at the referrals array */
 828
 829                 p = (char *)rdata+8;
 830                 for (i=0; i<num_referrals && p < endp; i++) {
 831                         if (p + 18 > endp) {
 832                                 goto out;
 833                         }
 834                         ref_version = SVAL(p, 0);
 835                         ref_size    = SVAL(p, 2);
 836                         node_offset = SVAL(p, 16);
 837
 838                         if (ref_version != 3) {
 839                                 p += ref_size;
 840                                 continue;
 841                         }
 842
 843                         referrals[i].proximity = SVAL(p, 8);
 844                         referrals[i].ttl       = SVAL(p, 10);
 845
 846                         if (p + node_offset > endp) {
 847                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 848                                 goto out;
 849                         }
 850                         clistr_pull_talloc(referrals,
 851                                            (const char *)rdata,
 852                                            recv_flags2,
 853                                            &referrals[i].dfspath,
 854                                            p+node_offset,
 855                                            PTR_DIFF(endp, p+node_offset),
 856                                            STR_TERMINATE|STR_UNICODE);
 857
 858                         if (!referrals[i].dfspath) {
 859                                 status = map_nt_error_from_unix(errno);
 860                                 goto out;
 861                         }
 862                         p += ref_size;
 863                 }
 864                 if (i < num_referrals) {
 865                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 866                         goto out;
 867                 }
 868         }
 869
 870         *num_refs = num_referrals;
 871         *refs = referrals;
 872
 873   out:
 874
 875         TALLOC_FREE(frame);
 876         return status;
 877 }
 878
 879 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 880                         struct cli_state *cli,
 881                         const char *path,
 882                         struct client_dfs_referral **refs,
 883                         size_t *num_refs,
 884                         size_t *consumed)
 885 {
 886         return cli_dfs_get_referral_ex(ctx,
 887                                 cli,
 888                                 path,
 889                                 3,
 890                                 refs, /* Max referral level we want */
 891                                 num_refs,
 892                                 consumed);
 893 }
 894
 895 /********************************************************************
 896 ********************************************************************/
 897 struct cli_dfs_path_split {
 898         char *server;
 899         char *share;
 900         char *extrapath;
 901 };
 902
 903 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 904                           const char *mountpt,
 905                           const struct user_auth_info *dfs_auth_info,
 906                           struct cli_state *rootcli,
 907                           const char *path,
 908                           struct cli_state **targetcli,
 909                           char **pp_targetpath)
 910 {
 911         struct client_dfs_referral *refs = NULL;
 912         size_t num_refs = 0;
 913         size_t consumed = 0;
 914         struct cli_state *cli_ipc = NULL;
 915         char *dfs_path = NULL;
 916         char *cleanpath = NULL;
 917         char *extrapath = NULL;
 918         int pathlen;
 919         struct cli_state *newcli = NULL;
 920         struct cli_state *ccli = NULL;
 921         int count = 0;
 922         char *newpath = NULL;
 923         char *newmount = NULL;
 924         char *ppath = NULL;
 925         SMB_STRUCT_STAT sbuf;
 926         uint32_t attributes;
 927         NTSTATUS status;
 928         struct cli_credentials *dfs_creds = NULL;
 929         bool force_encryption = true;
 930         struct smbXcli_tcon *root_tcon = NULL;
 931         struct smbXcli_tcon *target_tcon = NULL;
 932         struct cli_dfs_path_split *dfs_refs = NULL;
 933
 934         if ( !rootcli || !path || !targetcli ) {
 935                 return NT_STATUS_INVALID_PARAMETER;
 936         }
 937
 938         /* Don't do anything if this is not a DFS root. */
 939
 940         if (smbXcli_conn_protocol(rootcli->conn) >= PROTOCOL_SMB2_02) {
 941                 root_tcon = rootcli->smb2.tcon;
 942                 force_encryption = smb2cli_tcon_is_encryption_on(root_tcon);
 943         } else {
 944                 root_tcon = rootcli->smb1.tcon;
 945                 force_encryption = smb1cli_conn_encryption_on(rootcli->conn);
 946         }
 947
 948         /*
 949          * Avoid more than one leading directory separator
 950          */
 951         while (IS_DIRECTORY_SEP(path[0]) && IS_DIRECTORY_SEP(path[1])) {
 952                 path++;
 953         }
 954
 955         if (!smbXcli_tcon_is_dfs_share(root_tcon)) {
 956                 *targetcli = rootcli;
 957                 *pp_targetpath = talloc_strdup(ctx, path);
 958                 if (!*pp_targetpath) {
 959                         return NT_STATUS_NO_MEMORY;
 960                 }
 961                 return NT_STATUS_OK;
 962         }
 963
 964         *targetcli = NULL;
 965
 966         /* Send a trans2_query_path_info to check for a referral. */
 967
 968         cleanpath = clean_path(ctx, path);
 969         if (!cleanpath) {
 970                 return NT_STATUS_NO_MEMORY;
 971         }
 972
 973         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 974         if (!dfs_path) {
 975                 return NT_STATUS_NO_MEMORY;
 976         }
 977
 978         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 979         if (NT_STATUS_IS_OK(status)) {
 980                 /* This is an ordinary path, just return it. */
 981                 *targetcli = rootcli;
 982                 *pp_targetpath = talloc_strdup(ctx, path);
 983                 if (!*pp_targetpath) {
 984                         return NT_STATUS_NO_MEMORY;
 985                 }
 986                 goto done;
 987         }
 988
 989         /* Special case where client asked for a path that does not exist */
 990
 991         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 992                                 status)) {
 993                 *targetcli = rootcli;
 994                 *pp_targetpath = talloc_strdup(ctx, path);
 995                 if (!*pp_targetpath) {
 996                         return NT_STATUS_NO_MEMORY;
 997                 }
 998                 goto done;
 999         }
1000
1001         /* We got an error, check for DFS referral. */
1002
1003         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
1004                                  status)) {
1005                 return status;
1006         }
1007
1008         /* Check for the referral. */
1009
1010         cli_ipc = cli_state_dup(ctx, rootcli);
1011         if (cli_ipc == NULL) {
1012                 return NT_STATUS_NO_MEMORY;
1013         }
1014
1015         dfs_creds = get_cmdline_auth_info_creds(auth_info);
1016
1017         status = cli_tree_connect_creds(cli_ipc, "IPC$", "IPC", dfs_creds);
1018         if (!NT_STATUS_IS_OK(status)) {
1019                 d_printf("tree connect failed: %s\n", nt_errstr(status));
1020                 cli_shutdown(cli_ipc);
1021                 return status;
1022         }
1023
1024         if (force_encrypt) {
1025                 status = cli_cm_force_encryption_creds(cli_ipc,
1026                                                        dfs_creds,
1027                                                        "IPC$");
1028                 if (!NT_STATUS_IS_OK(status)) {
1029                         cli_shutdown(cli_ipc);
1030                         return status;
1031                 }
1032         }
1033
1034         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
1035                                       &num_refs, &consumed);
1036         if (!NT_STATUS_IS_OK(status)) {
1037                 return status;
1038         }
1039
1040         if (!num_refs || !refs[0].dfspath) {
1041                 return NT_STATUS_NOT_FOUND;
1042         }
1043
1044         /*
1045          * Bug#10123 - DFS referal entries can be provided in a random order,
1046          * so check the connection cache for each item to avoid unnecessary
1047          * reconnections.
1048          */
1049         dfs_refs = talloc_array(ctx, struct cli_dfs_path_split, num_refs);
1050         if (dfs_refs == NULL) {
1051                 return NT_STATUS_NO_MEMORY;
1052         }
1053
1054         for (count = 0; count < num_refs; count++) {
1055                 if (!split_dfs_path(dfs_refs, refs[count].dfspath,
1056                                     &dfs_refs[count].server,
1057                                     &dfs_refs[count].share,
1058                                     &dfs_refs[count].extrapath)) {
1059                         TALLOC_FREE(dfs_refs);
1060                         return NT_STATUS_NOT_FOUND;
1061                 }
1062
1063                 ccli = cli_cm_find(rootcli, dfs_refs[count].server,
1064                                    dfs_refs[count].share);
1065                 if (ccli != NULL) {
1066                         extrapath = dfs_refs[count].extrapath;
1067                         *targetcli = ccli;
1068                         break;
1069                 }
1070         }
1071
1072         /*
1073          * If no cached connection was found, then connect to the first live
1074          * referral server in the list.
1075          */
1076         for (count = 0; (ccli == NULL) && (count < num_refs); count++) {
1077                 /* Connect to the target server & share */
1078                 status = cli_cm_connect(ctx, rootcli,
1079                                 dfs_refs[count].server,
1080                                 NULL,
1081                                 dfs_refs[count].share,
1082                                 dfs_auth_info,
1083                                 cli_state_is_encryption_on(rootcli),
1084                                 smbXcli_conn_protocol(rootcli->conn),
1085                                 0,
1086                                 0x20,
1087                                 targetcli);
1088                 if (!NT_STATUS_IS_OK(status)) {
1089                         d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
1090                                  dfs_refs[count].server,
1091                                  dfs_refs[count].share);
1092                         continue;
1093                 } else {
1094                         extrapath = dfs_refs[count].extrapath;
1095                         break;
1096                 }
1097         }
1098
1099         /* No available referral server for the connection */
1100         if (*targetcli == NULL) {
1101                 TALLOC_FREE(dfs_refs);
1102                 return status;
1103         }
1104
1105         /* Make sure to recreate the original string including any wildcards. */
1106
1107         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
1108         if (!dfs_path) {
1109                 TALLOC_FREE(dfs_refs);
1110                 return NT_STATUS_NO_MEMORY;
1111         }
1112         pathlen = strlen(dfs_path);
1113         consumed = MIN(pathlen, consumed);
1114         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
1115         if (!*pp_targetpath) {
1116                 TALLOC_FREE(dfs_refs);
1117                 return NT_STATUS_NO_MEMORY;
1118         }
1119         dfs_path[consumed] = '\0';
1120
1121         /*
1122          * *pp_targetpath is now the unconsumed part of the path.
1123          * dfs_path is now the consumed part of the path
1124          * (in \server\share\path format).
1125          */
1126
1127         if (extrapath && strlen(extrapath) > 0) {
1128                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
1129                 /* put the trailing \ on the path, so to be save we put one in if needed */
1130                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
1131                         *pp_targetpath = talloc_asprintf(ctx,
1132                                                   "%s\\%s",
1133                                                   extrapath,
1134                                                   *pp_targetpath);
1135                 } else {
1136                         *pp_targetpath = talloc_asprintf(ctx,
1137                                                   "%s%s",
1138                                                   extrapath,
1139                                                   *pp_targetpath);
1140                 }
1141                 if (!*pp_targetpath) {
1142                         TALLOC_FREE(dfs_refs);
1143                         return NT_STATUS_NO_MEMORY;
1144                 }
1145         }
1146
1147         /* parse out the consumed mount path */
1148         /* trim off the \server\share\ */
1149
1150         ppath = dfs_path;
1151
1152         if (*ppath != '\\') {
1153                 d_printf("cli_resolve_path: "
1154                         "dfs_path (%s) not in correct format.\n",
1155                         dfs_path );
1156                 TALLOC_FREE(dfs_refs);
1157                 return NT_STATUS_NOT_FOUND;
1158         }
1159
1160         ppath++; /* Now pointing at start of server name. */
1161
1162         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
1163                 TALLOC_FREE(dfs_refs);
1164                 return NT_STATUS_NOT_FOUND;
1165         }
1166
1167         ppath++; /* Now pointing at start of share name. */
1168
1169         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1170                 TALLOC_FREE(dfs_refs);
1171                 return NT_STATUS_NOT_FOUND;
1172         }
1173
1174         ppath++; /* Now pointing at path component. */
1175
1176         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1177         if (!newmount) {
1178                 TALLOC_FREE(dfs_refs);
1179                 return NT_STATUS_NOT_FOUND;
1180         }
1181
1182         cli_set_mntpoint(*targetcli, newmount);
1183
1184         /* Check for another dfs referral, note that we are not
1185            checking for loops here. */
1186
1187         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1188                 status = cli_resolve_path(ctx,
1189                                           newmount,
1190                                           dfs_auth_info,
1191                                           *targetcli,
1192                                           *pp_targetpath,
1193                                           &newcli,
1194                                           &newpath);
1195                 if (NT_STATUS_IS_OK(status)) {
1196                         /*
1197                          * When cli_resolve_path returns true here it's always
1198                          * returning the complete path in newpath, so we're done
1199                          * here.
1200                          */
1201                         *targetcli = newcli;
1202                         *pp_targetpath = newpath;
1203                         TALLOC_FREE(dfs_refs);
1204                         return status;
1205                 }
1206         }
1207
1208   done:
1209
1210         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1211                 target_tcon = (*targetcli)->smb2.tcon;
1212         } else {
1213                 target_tcon = (*targetcli)->smb1.tcon;
1214         }
1215
1216         /* If returning true ensure we return a dfs root full path. */
1217         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1218                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1219                 if (!dfs_path) {
1220                         TALLOC_FREE(dfs_refs);
1221                         return NT_STATUS_NO_MEMORY;
1222                 }
1223                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1224                 if (*pp_targetpath == NULL) {
1225                         TALLOC_FREE(dfs_refs);
1226                         return NT_STATUS_NO_MEMORY;
1227                 }
1228         }
1229
1230         TALLOC_FREE(dfs_refs);
1231         return NT_STATUS_OK;
1232 }
1233
1234 /********************************************************************
1235 ********************************************************************/
1236
1237 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1238                                 struct cli_state *cli,
1239                                 const char *sharename,
1240                                 char **pp_newserver,
1241                                 char **pp_newshare,
1242                                 bool force_encrypt,
1243                                 struct cli_credentials *creds)
1244 {
1245         struct client_dfs_referral *refs = NULL;
1246         size_t num_refs = 0;
1247         size_t consumed = 0;
1248         char *fullpath = NULL;
1249         bool res;
1250         struct smbXcli_tcon *orig_tcon = NULL;
1251         char *newextrapath = NULL;
1252         NTSTATUS status;
1253         const char *remote_name;
1254
1255         if (!cli || !sharename) {
1256                 return false;
1257         }
1258
1259         remote_name = smbXcli_conn_remote_name(cli->conn);
1260
1261         /* special case.  never check for a referral on the IPC$ share */
1262
1263         if (strequal(sharename, "IPC$")) {
1264                 return false;
1265         }
1266
1267         /* send a trans2_query_path_info to check for a referral */
1268
1269         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1270         if (!fullpath) {
1271                 return false;
1272         }
1273
1274         /* Store tcon state. */
1275         if (cli_state_has_tcon(cli)) {
1276                 orig_tcon = cli_state_save_tcon(cli);
1277                 if (orig_tcon == NULL) {
1278                         return false;
1279                 }
1280         }
1281
1282         /* check for the referral */
1283
1284         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL))) {
1285                 cli_state_restore_tcon(cli, orig_tcon);
1286                 return false;
1287         }
1288
1289         if (force_encrypt) {
1290                 status = cli_cm_force_encryption_creds(cli, creds, "IPC$");
1291                 if (!NT_STATUS_IS_OK(status)) {
1292                         cli_state_restore_tcon(cli, orig_tcon);
1293                         return false;
1294                 }
1295         }
1296
1297         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1298                                       &num_refs, &consumed);
1299         res = NT_STATUS_IS_OK(status);
1300
1301         status = cli_tdis(cli);
1302
1303         cli_state_restore_tcon(cli, orig_tcon);
1304
1305         if (!NT_STATUS_IS_OK(status)) {
1306                 return false;
1307         }
1308
1309         if (!res || !num_refs) {
1310                 return false;
1311         }
1312
1313         if (!refs[0].dfspath) {
1314                 return false;
1315         }
1316
1317         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1318                             pp_newshare, &newextrapath)) {
1319                 return false;
1320         }
1321
1322         /* check that this is not a self-referral */
1323
1324         if (strequal(remote_name, *pp_newserver) &&
1325                         strequal(sharename, *pp_newshare)) {
1326                 return false;
1327         }
1328
1329         return true;
1330 }