source3/libsmb/clidfs.c

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