source3/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6    Copyright (C) Jeremy Allison                   2007-2009
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libsmb/libsmb.h"
  24 #include "libsmb/clirap.h"
  25 #include "msdfs.h"
  26 #include "trans2.h"
  27 #include "libsmb/nmblib.h"
  28 #include "../libcli/smb/smbXcli_base.h"
  29
  30 /********************************************************************
  31  Important point.
  32
  33  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  34  are not C escaped here).
  35
  36  - but if we're using POSIX paths then <pathname> may contain
  37    '/' separators, not '\\' separators. So cope with '\\' or '/'
  38    as a separator when looking at the pathname part.... JRA.
  39 ********************************************************************/
  40
  41 /********************************************************************
  42  Ensure a connection is encrypted.
  43 ********************************************************************/
  44
  45 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  46                         const char *username,
  47                         const char *password,
  48                         const char *domain,
  49                         const char *sharename)
  50 {
  51         NTSTATUS status;
  52
  53         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
  54                 status = smb2cli_session_encryption_on(c->smb2.session);
  55                 if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  56                         d_printf("Encryption required and "
  57                                 "server doesn't support "
  58                                 "SMB3 encryption - failing connect\n");
  59                 } else if (!NT_STATUS_IS_OK(status)) {
  60                         d_printf("Encryption required and "
  61                                 "setup failed with error %s.\n",
  62                                 nt_errstr(status));
  63                 }
  64                 return status;
  65         }
  66
  67         status = cli_force_encryption(c,
  68                                         username,
  69                                         password,
  70                                         domain);
  71
  72         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  73                 d_printf("Encryption required and "
  74                         "server that doesn't support "
  75                         "UNIX extensions - failing connect\n");
  76         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  77                 d_printf("Encryption required and "
  78                         "can't get UNIX CIFS extensions "
  79                         "version from server.\n");
  80         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  81                 d_printf("Encryption required and "
  82                         "share %s doesn't support "
  83                         "encryption.\n", sharename);
  84         } else if (!NT_STATUS_IS_OK(status)) {
  85                 d_printf("Encryption required and "
  86                         "setup failed with error %s.\n",
  87                         nt_errstr(status));
  88         }
  89
  90         return status;
  91 }
  92
  93 /********************************************************************
  94  Return a connection to a server.
  95 ********************************************************************/
  96
  97 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  98                                         const char *server,
  99                                         const char *share,
 100                                         const struct user_auth_info *auth_info,
 101                                         bool show_sessetup,
 102                                         bool force_encrypt,
 103                                         int max_protocol,
 104                                         int port,
 105                                         int name_type,
 106                                         struct cli_state **pcli)
 107 {
 108         struct cli_state *c = NULL;
 109         char *servicename;
 110         char *sharename;
 111         char *newserver, *newshare;
 112         const char *username;
 113         const char *password;
 114         NTSTATUS status;
 115         int flags = 0;
 116
 117         /* make a copy so we don't modify the global string 'service' */
 118         servicename = talloc_strdup(ctx,share);
 119         if (!servicename) {
 120                 return NT_STATUS_NO_MEMORY;
 121         }
 122         sharename = servicename;
 123         if (*sharename == '\\') {
 124                 sharename += 2;
 125                 if (server == NULL) {
 126                         server = sharename;
 127                 }
 128                 sharename = strchr_m(sharename,'\\');
 129                 if (!sharename) {
 130                         return NT_STATUS_NO_MEMORY;
 131                 }
 132                 *sharename = 0;
 133                 sharename++;
 134         }
 135         if (server == NULL) {
 136                 return NT_STATUS_INVALID_PARAMETER;
 137         }
 138
 139         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 140                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 141         }
 142         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 143                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 144         }
 145         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 146                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 147         }
 148         if (get_cmdline_auth_info_use_pw_nt_hash(auth_info)) {
 149                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 150         }
 151
 152         status = cli_connect_nb(
 153                 server, NULL, port, name_type, NULL,
 154                 get_cmdline_auth_info_signing_state(auth_info),
 155                 flags, &c);
 156
 157         if (!NT_STATUS_IS_OK(status)) {
 158                 d_printf("Connection to %s failed (Error %s)\n",
 159                                 server,
 160                                 nt_errstr(status));
 161                 return status;
 162         }
 163
 164         if (max_protocol == 0) {
 165                 max_protocol = PROTOCOL_NT1;
 166         }
 167         DEBUG(4,(" session request ok\n"));
 168
 169         status = smbXcli_negprot(c->conn, c->timeout,
 170                                  lp_client_min_protocol(),
 171                                  max_protocol);
 172
 173         if (!NT_STATUS_IS_OK(status)) {
 174                 d_printf("protocol negotiation failed: %s\n",
 175                          nt_errstr(status));
 176                 cli_shutdown(c);
 177                 return status;
 178         }
 179
 180         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 181                 /* Ensure we ask for some initial credits. */
 182                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 183         }
 184
 185         username = get_cmdline_auth_info_username(auth_info);
 186         password = get_cmdline_auth_info_password(auth_info);
 187
 188         status = cli_session_setup(c, username,
 189                                    password, strlen(password),
 190                                    password, strlen(password),
 191                                    lp_workgroup());
 192         if (!NT_STATUS_IS_OK(status)) {
 193                 /* If a password was not supplied then
 194                  * try again with a null username. */
 195                 if (password[0] || !username[0] ||
 196                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 197                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 198                                                 "", 0,
 199                                                 "", 0,
 200                                                lp_workgroup()))) {
 201                         d_printf("session setup failed: %s\n",
 202                                  nt_errstr(status));
 203                         if (NT_STATUS_EQUAL(status,
 204                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 205                                 d_printf("did you forget to run kinit?\n");
 206                         cli_shutdown(c);
 207                         return status;
 208                 }
 209                 d_printf("Anonymous login successful\n");
 210         }
 211
 212         if (!NT_STATUS_IS_OK(status)) {
 213                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 214                 cli_shutdown(c);
 215                 return status;
 216         }
 217
 218         if ( show_sessetup ) {
 219                 if (*c->server_domain) {
 220                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 221                                 c->server_domain,c->server_os,c->server_type));
 222                 } else if (*c->server_os || *c->server_type) {
 223                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 224                                  c->server_os,c->server_type));
 225                 }
 226         }
 227         DEBUG(4,(" session setup ok\n"));
 228
 229         /* here's the fun part....to support 'msdfs proxy' shares
 230            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 231            here before trying to connect to the original share.
 232            cli_check_msdfs_proxy() will fail if it is a normal share. */
 233
 234         if (smbXcli_conn_dfs_supported(c->conn) &&
 235                         cli_check_msdfs_proxy(ctx, c, sharename,
 236                                 &newserver, &newshare,
 237                                 force_encrypt,
 238                                 username,
 239                                 password,
 240                                 lp_workgroup())) {
 241                 cli_shutdown(c);
 242                 return do_connect(ctx, newserver,
 243                                 newshare, auth_info, false,
 244                                 force_encrypt, max_protocol,
 245                                 port, name_type, pcli);
 246         }
 247
 248         /* must be a normal share */
 249
 250         status = cli_tree_connect(c, sharename, "?????",
 251                                   password, strlen(password)+1);
 252         if (!NT_STATUS_IS_OK(status)) {
 253                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 254                 cli_shutdown(c);
 255                 return status;
 256         }
 257
 258         if (force_encrypt) {
 259                 status = cli_cm_force_encryption(c,
 260                                         username,
 261                                         password,
 262                                         lp_workgroup(),
 263                                         sharename);
 264                 if (!NT_STATUS_IS_OK(status)) {
 265                         cli_shutdown(c);
 266                         return status;
 267                 }
 268         }
 269
 270         DEBUG(4,(" tconx ok\n"));
 271         *pcli = c;
 272         return NT_STATUS_OK;
 273 }
 274
 275 /****************************************************************************
 276 ****************************************************************************/
 277
 278 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 279 {
 280         TALLOC_CTX *frame = talloc_stackframe();
 281         char *name = clean_name(frame, mnt);
 282         if (!name) {
 283                 TALLOC_FREE(frame);
 284                 return;
 285         }
 286         TALLOC_FREE(cli->dfs_mountpoint);
 287         cli->dfs_mountpoint = talloc_strdup(cli, name);
 288         TALLOC_FREE(frame);
 289 }
 290
 291 /********************************************************************
 292  Add a new connection to the list.
 293  referring_cli == NULL means a new initial connection.
 294 ********************************************************************/
 295
 296 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 297                                struct cli_state *referring_cli,
 298                                const char *server,
 299                                const char *share,
 300                                const struct user_auth_info *auth_info,
 301                                bool show_hdr,
 302                                bool force_encrypt,
 303                                int max_protocol,
 304                                int port,
 305                                int name_type,
 306                                struct cli_state **pcli)
 307 {
 308         struct cli_state *cli;
 309         NTSTATUS status;
 310
 311         status = do_connect(ctx, server, share,
 312                                 auth_info,
 313                                 show_hdr, force_encrypt, max_protocol,
 314                                 port, name_type, &cli);
 315
 316         if (!NT_STATUS_IS_OK(status)) {
 317                 return status;
 318         }
 319
 320         /* Enter into the list. */
 321         if (referring_cli) {
 322                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 323         }
 324
 325         if (referring_cli && referring_cli->requested_posix_capabilities) {
 326                 uint16 major, minor;
 327                 uint32 caplow, caphigh;
 328                 status = cli_unix_extensions_version(cli, &major, &minor,
 329                                                      &caplow, &caphigh);
 330                 if (NT_STATUS_IS_OK(status)) {
 331                         cli_set_unix_extensions_capabilities(cli,
 332                                         major, minor,
 333                                         caplow, caphigh);
 334                 }
 335         }
 336
 337         *pcli = cli;
 338         return NT_STATUS_OK;
 339 }
 340
 341 /********************************************************************
 342  Return a connection to a server on a particular share.
 343 ********************************************************************/
 344
 345 static struct cli_state *cli_cm_find(struct cli_state *cli,
 346                                 const char *server,
 347                                 const char *share)
 348 {
 349         struct cli_state *p;
 350
 351         if (cli == NULL) {
 352                 return NULL;
 353         }
 354
 355         /* Search to the start of the list. */
 356         for (p = cli; p; p = DLIST_PREV(p)) {
 357                 const char *remote_name =
 358                         smbXcli_conn_remote_name(p->conn);
 359
 360                 if (strequal(server, remote_name) &&
 361                                 strequal(share,p->share)) {
 362                         return p;
 363                 }
 364         }
 365
 366         /* Search to the end of the list. */
 367         for (p = cli->next; p; p = p->next) {
 368                 const char *remote_name =
 369                         smbXcli_conn_remote_name(p->conn);
 370
 371                 if (strequal(server, remote_name) &&
 372                                 strequal(share,p->share)) {
 373                         return p;
 374                 }
 375         }
 376
 377         return NULL;
 378 }
 379
 380 /****************************************************************************
 381  Open a client connection to a \\server\share.
 382 ****************************************************************************/
 383
 384 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 385                                 struct cli_state *referring_cli,
 386                                 const char *server,
 387                                 const char *share,
 388                                 const struct user_auth_info *auth_info,
 389                                 bool show_hdr,
 390                                 bool force_encrypt,
 391                                 int max_protocol,
 392                                 int port,
 393                                 int name_type,
 394                                 struct cli_state **pcli)
 395 {
 396         /* Try to reuse an existing connection in this list. */
 397         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 398         NTSTATUS status;
 399
 400         if (c) {
 401                 *pcli = c;
 402                 return NT_STATUS_OK;
 403         }
 404
 405         if (auth_info == NULL) {
 406                 /* Can't do a new connection
 407                  * without auth info. */
 408                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 409                         "without auth info\n",
 410                         server, share );
 411                 return NT_STATUS_INVALID_PARAMETER;
 412         }
 413
 414         status = cli_cm_connect(ctx,
 415                                 referring_cli,
 416                                 server,
 417                                 share,
 418                                 auth_info,
 419                                 show_hdr,
 420                                 force_encrypt,
 421                                 max_protocol,
 422                                 port,
 423                                 name_type,
 424                                 &c);
 425         if (!NT_STATUS_IS_OK(status)) {
 426                 return status;
 427         }
 428         *pcli = c;
 429         return NT_STATUS_OK;
 430 }
 431
 432 /****************************************************************************
 433 ****************************************************************************/
 434
 435 void cli_cm_display(struct cli_state *cli)
 436 {
 437         int i;
 438
 439         for (i=0; cli; cli = cli->next,i++ ) {
 440                 d_printf("%d:\tserver=%s, share=%s\n",
 441                         i, smbXcli_conn_remote_name(cli->conn), cli->share);
 442         }
 443 }
 444
 445 /****************************************************************************
 446 ****************************************************************************/
 447
 448 /****************************************************************************
 449 ****************************************************************************/
 450
 451 #if 0
 452 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 453 {
 454         SAFE_FREE(cm_creds.username);
 455         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 456                                                auth_info));
 457
 458         if (get_cmdline_auth_info_got_pass(auth_info)) {
 459                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 460         }
 461
 462         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 463         cm_creds.fallback_after_kerberos = false;
 464         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 465 }
 466 #endif
 467
 468 /**********************************************************************
 469  split a dfs path into the server, share name, and extrapath components
 470 **********************************************************************/
 471
 472 static bool split_dfs_path(TALLOC_CTX *ctx,
 473                                 const char *nodepath,
 474                                 char **pp_server,
 475                                 char **pp_share,
 476                                 char **pp_extrapath)
 477 {
 478         char *p, *q;
 479         char *path;
 480
 481         *pp_server = NULL;
 482         *pp_share = NULL;
 483         *pp_extrapath = NULL;
 484
 485         path = talloc_strdup(ctx, nodepath);
 486         if (!path) {
 487                 goto fail;
 488         }
 489
 490         if ( path[0] != '\\' ) {
 491                 goto fail;
 492         }
 493
 494         p = strchr_m( path + 1, '\\' );
 495         if ( !p ) {
 496                 goto fail;
 497         }
 498
 499         *p = '\0';
 500         p++;
 501
 502         /* Look for any extra/deep path */
 503         q = strchr_m(p, '\\');
 504         if (q != NULL) {
 505                 *q = '\0';
 506                 q++;
 507                 *pp_extrapath = talloc_strdup(ctx, q);
 508         } else {
 509                 *pp_extrapath = talloc_strdup(ctx, "");
 510         }
 511         if (*pp_extrapath == NULL) {
 512                 goto fail;
 513         }
 514
 515         *pp_share = talloc_strdup(ctx, p);
 516         if (*pp_share == NULL) {
 517                 goto fail;
 518         }
 519
 520         *pp_server = talloc_strdup(ctx, &path[1]);
 521         if (*pp_server == NULL) {
 522                 goto fail;
 523         }
 524
 525         TALLOC_FREE(path);
 526         return true;
 527
 528 fail:
 529         TALLOC_FREE(*pp_share);
 530         TALLOC_FREE(*pp_extrapath);
 531         TALLOC_FREE(path);
 532         return false;
 533 }
 534
 535 /****************************************************************************
 536  Return the original path truncated at the directory component before
 537  the first wildcard character. Trust the caller to provide a NULL
 538  terminated string
 539 ****************************************************************************/
 540
 541 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 542 {
 543         size_t len;
 544         char *p1, *p2, *p;
 545         char *path_out;
 546
 547         /* No absolute paths. */
 548         while (IS_DIRECTORY_SEP(*path)) {
 549                 path++;
 550         }
 551
 552         path_out = talloc_strdup(ctx, path);
 553         if (!path_out) {
 554                 return NULL;
 555         }
 556
 557         p1 = strchr_m(path_out, '*');
 558         p2 = strchr_m(path_out, '?');
 559
 560         if (p1 || p2) {
 561                 if (p1 && p2) {
 562                         p = MIN(p1,p2);
 563                 } else if (!p1) {
 564                         p = p2;
 565                 } else {
 566                         p = p1;
 567                 }
 568                 *p = '\0';
 569
 570                 /* Now go back to the start of this component. */
 571                 p1 = strrchr_m(path_out, '/');
 572                 p2 = strrchr_m(path_out, '\\');
 573                 p = MAX(p1,p2);
 574                 if (p) {
 575                         *p = '\0';
 576                 }
 577         }
 578
 579         /* Strip any trailing separator */
 580
 581         len = strlen(path_out);
 582         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 583                 path_out[len-1] = '\0';
 584         }
 585
 586         return path_out;
 587 }
 588
 589 /****************************************************************************
 590 ****************************************************************************/
 591
 592 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 593                                         struct cli_state *cli,
 594                                         const char *dir)
 595 {
 596         char path_sep = '\\';
 597
 598         /* Ensure the extrapath doesn't start with a separator. */
 599         while (IS_DIRECTORY_SEP(*dir)) {
 600                 dir++;
 601         }
 602
 603         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 604                 path_sep = '/';
 605         }
 606         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 607                         path_sep,
 608                         smbXcli_conn_remote_name(cli->conn),
 609                         path_sep,
 610                         cli->share,
 611                         path_sep,
 612                         dir);
 613 }
 614
 615 /********************************************************************
 616  check for dfs referral
 617 ********************************************************************/
 618
 619 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 620                                 NTSTATUS status)
 621 {
 622         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 623
 624         if (!(smbXcli_conn_use_unicode(cli->conn))) {
 625                 return false;
 626         }
 627         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 628                 return false;
 629         }
 630         if (NT_STATUS_EQUAL(status, expected)) {
 631                 return true;
 632         }
 633         return false;
 634 }
 635
 636 /********************************************************************
 637  Get the dfs referral link.
 638 ********************************************************************/
 639
 640 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 641                         struct cli_state *cli,
 642                         const char *path,
 643                         struct client_dfs_referral **refs,
 644                         size_t *num_refs,
 645                         size_t *consumed)
 646 {
 647         unsigned int param_len = 0;
 648         uint16_t recv_flags2;
 649         uint8_t *param = NULL;
 650         uint8_t *rdata = NULL;
 651         char *p;
 652         char *endp;
 653         smb_ucs2_t *path_ucs;
 654         char *consumed_path = NULL;
 655         uint16_t consumed_ucs;
 656         uint16 num_referrals;
 657         struct client_dfs_referral *referrals = NULL;
 658         NTSTATUS status;
 659         TALLOC_CTX *frame = talloc_stackframe();
 660
 661         *num_refs = 0;
 662         *refs = NULL;
 663
 664         param = talloc_array(talloc_tos(), uint8_t, 2);
 665         if (!param) {
 666                 status = NT_STATUS_NO_MEMORY;
 667                 goto out;
 668         }
 669         SSVAL(param, 0, 0x03);  /* max referral level */
 670
 671         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 672                                       path, strlen(path)+1,
 673                                       NULL);
 674         if (!param) {
 675                 status = NT_STATUS_NO_MEMORY;
 676                 goto out;
 677         }
 678         param_len = talloc_get_size(param);
 679         path_ucs = (smb_ucs2_t *)&param[2];
 680
 681         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
 682                 DATA_BLOB in_input_buffer;
 683                 DATA_BLOB in_output_buffer = data_blob_null;
 684                 DATA_BLOB out_input_buffer = data_blob_null;
 685                 DATA_BLOB out_output_buffer = data_blob_null;
 686
 687                 in_input_buffer.data = param;
 688                 in_input_buffer.length = param_len;
 689
 690                 status = smb2cli_ioctl(cli->conn,
 691                                        cli->timeout,
 692                                        cli->smb2.session,
 693                                        cli->smb2.tcon,
 694                                        UINT64_MAX, /* in_fid_persistent */
 695                                        UINT64_MAX, /* in_fid_volatile */
 696                                        FSCTL_DFS_GET_REFERRALS,
 697                                        0, /* in_max_input_length */
 698                                        &in_input_buffer,
 699                                        CLI_BUFFER_SIZE, /* in_max_output_length */
 700                                        &in_output_buffer,
 701                                        SMB2_IOCTL_FLAG_IS_FSCTL,
 702                                        talloc_tos(),
 703                                        &out_input_buffer,
 704                                        &out_output_buffer);
 705                 if (!NT_STATUS_IS_OK(status)) {
 706                         goto out;
 707                 }
 708
 709                 if (out_output_buffer.length < 4) {
 710                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 711                         goto out;
 712                 }
 713
 714                 recv_flags2 = FLAGS2_UNICODE_STRINGS;
 715                 rdata = out_output_buffer.data;
 716                 endp = (char *)rdata + out_output_buffer.length;
 717         } else {
 718                 unsigned int data_len = 0;
 719                 uint16_t setup[1];
 720
 721                 SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 722
 723                 status = cli_trans(talloc_tos(), cli, SMBtrans2,
 724                                    NULL, 0xffff, 0, 0,
 725                                    setup, 1, 0,
 726                                    param, param_len, 2,
 727                                    NULL, 0, CLI_BUFFER_SIZE,
 728                                    &recv_flags2,
 729                                    NULL, 0, NULL, /* rsetup */
 730                                    NULL, 0, NULL,
 731                                    &rdata, 4, &data_len);
 732                 if (!NT_STATUS_IS_OK(status)) {
 733                         goto out;
 734                 }
 735
 736                 endp = (char *)rdata + data_len;
 737         }
 738
 739         consumed_ucs  = SVAL(rdata, 0);
 740         num_referrals = SVAL(rdata, 2);
 741
 742         /* consumed_ucs is the number of bytes
 743          * of the UCS2 path consumed not counting any
 744          * terminating null. We need to convert
 745          * back to unix charset and count again
 746          * to get the number of bytes consumed from
 747          * the incoming path. */
 748
 749         errno = 0;
 750         if (pull_string_talloc(talloc_tos(),
 751                         NULL,
 752                         0,
 753                         &consumed_path,
 754                         path_ucs,
 755                         consumed_ucs,
 756                         STR_UNICODE) == 0) {
 757                 if (errno != 0) {
 758                         status = map_nt_error_from_unix(errno);
 759                 } else {
 760                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 761                 }
 762                 goto out;
 763         }
 764         if (consumed_path == NULL) {
 765                 status = map_nt_error_from_unix(errno);
 766                 goto out;
 767         }
 768         *consumed = strlen(consumed_path);
 769
 770         if (num_referrals != 0) {
 771                 uint16 ref_version;
 772                 uint16 ref_size;
 773                 int i;
 774                 uint16 node_offset;
 775
 776                 referrals = talloc_array(ctx, struct client_dfs_referral,
 777                                          num_referrals);
 778
 779                 if (!referrals) {
 780                         status = NT_STATUS_NO_MEMORY;
 781                         goto out;
 782                 }
 783                 /* start at the referrals array */
 784
 785                 p = (char *)rdata+8;
 786                 for (i=0; i<num_referrals && p < endp; i++) {
 787                         if (p + 18 > endp) {
 788                                 goto out;
 789                         }
 790                         ref_version = SVAL(p, 0);
 791                         ref_size    = SVAL(p, 2);
 792                         node_offset = SVAL(p, 16);
 793
 794                         if (ref_version != 3) {
 795                                 p += ref_size;
 796                                 continue;
 797                         }
 798
 799                         referrals[i].proximity = SVAL(p, 8);
 800                         referrals[i].ttl       = SVAL(p, 10);
 801
 802                         if (p + node_offset > endp) {
 803                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 804                                 goto out;
 805                         }
 806                         clistr_pull_talloc(referrals,
 807                                            (const char *)rdata,
 808                                            recv_flags2,
 809                                            &referrals[i].dfspath,
 810                                            p+node_offset,
 811                                            PTR_DIFF(endp, p+node_offset),
 812                                            STR_TERMINATE|STR_UNICODE);
 813
 814                         if (!referrals[i].dfspath) {
 815                                 status = map_nt_error_from_unix(errno);
 816                                 goto out;
 817                         }
 818                         p += ref_size;
 819                 }
 820                 if (i < num_referrals) {
 821                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 822                         goto out;
 823                 }
 824         }
 825
 826         *num_refs = num_referrals;
 827         *refs = referrals;
 828
 829   out:
 830
 831         TALLOC_FREE(frame);
 832         return status;
 833 }
 834
 835 /********************************************************************
 836 ********************************************************************/
 837
 838 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 839                           const char *mountpt,
 840                           const struct user_auth_info *dfs_auth_info,
 841                           struct cli_state *rootcli,
 842                           const char *path,
 843                           struct cli_state **targetcli,
 844                           char **pp_targetpath)
 845 {
 846         struct client_dfs_referral *refs = NULL;
 847         size_t num_refs = 0;
 848         size_t consumed = 0;
 849         struct cli_state *cli_ipc = NULL;
 850         char *dfs_path = NULL;
 851         char *cleanpath = NULL;
 852         char *extrapath = NULL;
 853         int pathlen;
 854         char *server = NULL;
 855         char *share = NULL;
 856         struct cli_state *newcli = NULL;
 857         char *newpath = NULL;
 858         char *newmount = NULL;
 859         char *ppath = NULL;
 860         SMB_STRUCT_STAT sbuf;
 861         uint32 attributes;
 862         NTSTATUS status;
 863         struct smbXcli_tcon *root_tcon = NULL;
 864         struct smbXcli_tcon *target_tcon = NULL;
 865
 866         if ( !rootcli || !path || !targetcli ) {
 867                 return NT_STATUS_INVALID_PARAMETER;
 868         }
 869
 870         /* Don't do anything if this is not a DFS root. */
 871
 872         if (smbXcli_conn_protocol(rootcli->conn) >= PROTOCOL_SMB2_02) {
 873                 root_tcon = rootcli->smb2.tcon;
 874         } else {
 875                 root_tcon = rootcli->smb1.tcon;
 876         }
 877
 878         if (!smbXcli_tcon_is_dfs_share(root_tcon)) {
 879                 *targetcli = rootcli;
 880                 *pp_targetpath = talloc_strdup(ctx, path);
 881                 if (!*pp_targetpath) {
 882                         return NT_STATUS_NO_MEMORY;
 883                 }
 884                 return NT_STATUS_OK;
 885         }
 886
 887         *targetcli = NULL;
 888
 889         /* Send a trans2_query_path_info to check for a referral. */
 890
 891         cleanpath = clean_path(ctx, path);
 892         if (!cleanpath) {
 893                 return NT_STATUS_NO_MEMORY;
 894         }
 895
 896         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 897         if (!dfs_path) {
 898                 return NT_STATUS_NO_MEMORY;
 899         }
 900
 901         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 902         if (NT_STATUS_IS_OK(status)) {
 903                 /* This is an ordinary path, just return it. */
 904                 *targetcli = rootcli;
 905                 *pp_targetpath = talloc_strdup(ctx, path);
 906                 if (!*pp_targetpath) {
 907                         return NT_STATUS_NO_MEMORY;
 908                 }
 909                 goto done;
 910         }
 911
 912         /* Special case where client asked for a path that does not exist */
 913
 914         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 915                                 status)) {
 916                 *targetcli = rootcli;
 917                 *pp_targetpath = talloc_strdup(ctx, path);
 918                 if (!*pp_targetpath) {
 919                         return NT_STATUS_NO_MEMORY;
 920                 }
 921                 goto done;
 922         }
 923
 924         /* We got an error, check for DFS referral. */
 925
 926         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 927                                  status)) {
 928                 return status;
 929         }
 930
 931         /* Check for the referral. */
 932
 933         status = cli_cm_open(ctx,
 934                              rootcli,
 935                              smbXcli_conn_remote_name(rootcli->conn),
 936                              "IPC$",
 937                              dfs_auth_info,
 938                              false,
 939                              smb1cli_conn_encryption_on(rootcli->conn),
 940                              smbXcli_conn_protocol(rootcli->conn),
 941                              0,
 942                              0x20,
 943                              &cli_ipc);
 944         if (!NT_STATUS_IS_OK(status)) {
 945                 return status;
 946         }
 947
 948         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 949                                       &num_refs, &consumed);
 950         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 951                 return status;
 952         }
 953
 954         /* Just store the first referral for now. */
 955
 956         if (!refs[0].dfspath) {
 957                 return NT_STATUS_NOT_FOUND;
 958         }
 959         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 960                             &extrapath)) {
 961                 return NT_STATUS_NOT_FOUND;
 962         }
 963
 964         /* Make sure to recreate the original string including any wildcards. */
 965
 966         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 967         if (!dfs_path) {
 968                 return NT_STATUS_NO_MEMORY;
 969         }
 970         pathlen = strlen(dfs_path);
 971         consumed = MIN(pathlen, consumed);
 972         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 973         if (!*pp_targetpath) {
 974                 return NT_STATUS_NO_MEMORY;
 975         }
 976         dfs_path[consumed] = '\0';
 977
 978         /*
 979          * *pp_targetpath is now the unconsumed part of the path.
 980          * dfs_path is now the consumed part of the path
 981          * (in \server\share\path format).
 982          */
 983
 984         /* Open the connection to the target server & share */
 985         status = cli_cm_open(ctx, rootcli,
 986                              server,
 987                              share,
 988                              dfs_auth_info,
 989                              false,
 990                              smb1cli_conn_encryption_on(rootcli->conn),
 991                              smbXcli_conn_protocol(rootcli->conn),
 992                              0,
 993                              0x20,
 994                              targetcli);
 995         if (!NT_STATUS_IS_OK(status)) {
 996                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 997                         server, share );
 998                 return status;
 999         }
1000
1001         if (extrapath && strlen(extrapath) > 0) {
1002                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
1003                 /* put the trailing \ on the path, so to be save we put one in if needed */
1004                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
1005                         *pp_targetpath = talloc_asprintf(ctx,
1006                                                   "%s\\%s",
1007                                                   extrapath,
1008                                                   *pp_targetpath);
1009                 } else {
1010                         *pp_targetpath = talloc_asprintf(ctx,
1011                                                   "%s%s",
1012                                                   extrapath,
1013                                                   *pp_targetpath);
1014                 }
1015                 if (!*pp_targetpath) {
1016                         return NT_STATUS_NO_MEMORY;
1017                 }
1018         }
1019
1020         /* parse out the consumed mount path */
1021         /* trim off the \server\share\ */
1022
1023         ppath = dfs_path;
1024
1025         if (*ppath != '\\') {
1026                 d_printf("cli_resolve_path: "
1027                         "dfs_path (%s) not in correct format.\n",
1028                         dfs_path );
1029                 return NT_STATUS_NOT_FOUND;
1030         }
1031
1032         ppath++; /* Now pointing at start of server name. */
1033
1034         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
1035                 return NT_STATUS_NOT_FOUND;
1036         }
1037
1038         ppath++; /* Now pointing at start of share name. */
1039
1040         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
1041                 return NT_STATUS_NOT_FOUND;
1042         }
1043
1044         ppath++; /* Now pointing at path component. */
1045
1046         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
1047         if (!newmount) {
1048                 return NT_STATUS_NOT_FOUND;
1049         }
1050
1051         cli_set_mntpoint(*targetcli, newmount);
1052
1053         /* Check for another dfs referral, note that we are not
1054            checking for loops here. */
1055
1056         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
1057                 status = cli_resolve_path(ctx,
1058                                           newmount,
1059                                           dfs_auth_info,
1060                                           *targetcli,
1061                                           *pp_targetpath,
1062                                           &newcli,
1063                                           &newpath);
1064                 if (NT_STATUS_IS_OK(status)) {
1065                         /*
1066                          * When cli_resolve_path returns true here it's always
1067                          * returning the complete path in newpath, so we're done
1068                          * here.
1069                          */
1070                         *targetcli = newcli;
1071                         *pp_targetpath = newpath;
1072                         return status;
1073                 }
1074         }
1075
1076   done:
1077
1078         if (smbXcli_conn_protocol((*targetcli)->conn) >= PROTOCOL_SMB2_02) {
1079                 target_tcon = (*targetcli)->smb2.tcon;
1080         } else {
1081                 target_tcon = (*targetcli)->smb1.tcon;
1082         }
1083
1084         /* If returning true ensure we return a dfs root full path. */
1085         if (smbXcli_tcon_is_dfs_share(target_tcon)) {
1086                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1087                 if (!dfs_path) {
1088                         return NT_STATUS_NO_MEMORY;
1089                 }
1090                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1091                 if (*pp_targetpath == NULL) {
1092                         return NT_STATUS_NO_MEMORY;
1093                 }
1094         }
1095
1096         return NT_STATUS_OK;
1097 }
1098
1099 /********************************************************************
1100 ********************************************************************/
1101
1102 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1103                                 struct cli_state *cli,
1104                                 const char *sharename,
1105                                 char **pp_newserver,
1106                                 char **pp_newshare,
1107                                 bool force_encrypt,
1108                                 const char *username,
1109                                 const char *password,
1110                                 const char *domain)
1111 {
1112         struct client_dfs_referral *refs = NULL;
1113         size_t num_refs = 0;
1114         size_t consumed = 0;
1115         char *fullpath = NULL;
1116         bool res;
1117         uint16 cnum;
1118         char *newextrapath = NULL;
1119         NTSTATUS status;
1120         const char *remote_name;
1121
1122         if (!cli || !sharename) {
1123                 return false;
1124         }
1125
1126         remote_name = smbXcli_conn_remote_name(cli->conn);
1127         cnum = cli_state_get_tid(cli);
1128
1129         /* special case.  never check for a referral on the IPC$ share */
1130
1131         if (strequal(sharename, "IPC$")) {
1132                 return false;
1133         }
1134
1135         /* send a trans2_query_path_info to check for a referral */
1136
1137         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1138         if (!fullpath) {
1139                 return false;
1140         }
1141
1142         /* check for the referral */
1143
1144         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL, 0))) {
1145                 return false;
1146         }
1147
1148         if (force_encrypt) {
1149                 status = cli_cm_force_encryption(cli,
1150                                         username,
1151                                         password,
1152                                         lp_workgroup(),
1153                                         "IPC$");
1154                 if (!NT_STATUS_IS_OK(status)) {
1155                         return false;
1156                 }
1157         }
1158
1159         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1160                                       &num_refs, &consumed);
1161         res = NT_STATUS_IS_OK(status);
1162
1163         status = cli_tdis(cli);
1164         if (!NT_STATUS_IS_OK(status)) {
1165                 return false;
1166         }
1167
1168         cli_state_set_tid(cli, cnum);
1169
1170         if (!res || !num_refs) {
1171                 return false;
1172         }
1173
1174         if (!refs[0].dfspath) {
1175                 return false;
1176         }
1177
1178         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1179                             pp_newshare, &newextrapath)) {
1180                 return false;
1181         }
1182
1183         /* check that this is not a self-referral */
1184
1185         if (strequal(remote_name, *pp_newserver) &&
1186                         strequal(sharename, *pp_newshare)) {
1187                 return false;
1188         }
1189
1190         return true;
1191 }