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
  29 /********************************************************************
  30  Important point.
  31
  32  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  33  are not C escaped here).
  34
  35  - but if we're using POSIX paths then <pathname> may contain
  36    '/' separators, not '\\' separators. So cope with '\\' or '/'
  37    as a separator when looking at the pathname part.... JRA.
  38 ********************************************************************/
  39
  40 /********************************************************************
  41  Ensure a connection is encrypted.
  42 ********************************************************************/
  43
  44 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  45                         const char *username,
  46                         const char *password,
  47                         const char *domain,
  48                         const char *sharename)
  49 {
  50         NTSTATUS status = cli_force_encryption(c,
  51                                         username,
  52                                         password,
  53                                         domain);
  54
  55         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  56                 d_printf("Encryption required and "
  57                         "server that doesn't support "
  58                         "UNIX extensions - failing connect\n");
  59         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  60                 d_printf("Encryption required and "
  61                         "can't get UNIX CIFS extensions "
  62                         "version from server.\n");
  63         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  64                 d_printf("Encryption required and "
  65                         "share %s doesn't support "
  66                         "encryption.\n", sharename);
  67         } else if (!NT_STATUS_IS_OK(status)) {
  68                 d_printf("Encryption required and "
  69                         "setup failed with error %s.\n",
  70                         nt_errstr(status));
  71         }
  72
  73         return status;
  74 }
  75
  76 /********************************************************************
  77  Return a connection to a server.
  78 ********************************************************************/
  79
  80 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  81                                         const char *server,
  82                                         const char *share,
  83                                         const struct user_auth_info *auth_info,
  84                                         bool show_sessetup,
  85                                         bool force_encrypt,
  86                                         int max_protocol,
  87                                         int port,
  88                                         int name_type,
  89                                         struct cli_state **pcli)
  90 {
  91         struct cli_state *c = NULL;
  92         char *servicename;
  93         char *sharename;
  94         char *newserver, *newshare;
  95         const char *username;
  96         const char *password;
  97         NTSTATUS status;
  98
  99         /* make a copy so we don't modify the global string 'service' */
 100         servicename = talloc_strdup(ctx,share);
 101         if (!servicename) {
 102                 return NT_STATUS_NO_MEMORY;
 103         }
 104         sharename = servicename;
 105         if (*sharename == '\\') {
 106                 sharename += 2;
 107                 if (server == NULL) {
 108                         server = sharename;
 109                 }
 110                 sharename = strchr_m(sharename,'\\');
 111                 if (!sharename) {
 112                         return NT_STATUS_NO_MEMORY;
 113                 }
 114                 *sharename = 0;
 115                 sharename++;
 116         }
 117         if (server == NULL) {
 118                 return NT_STATUS_INVALID_PARAMETER;
 119         }
 120
 121         status = cli_connect_nb(
 122                 server, NULL, port, name_type, NULL,
 123                 get_cmdline_auth_info_signing_state(auth_info), &c);
 124
 125         if (!NT_STATUS_IS_OK(status)) {
 126                 d_printf("Connection to %s failed (Error %s)\n",
 127                                 server,
 128                                 nt_errstr(status));
 129                 return status;
 130         }
 131
 132         if (max_protocol == 0) {
 133                 max_protocol = PROTOCOL_NT1;
 134         }
 135         c->protocol = max_protocol;
 136         c->use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 137         c->fallback_after_kerberos =
 138                 get_cmdline_auth_info_fallback_after_kerberos(auth_info);
 139         c->use_ccache = get_cmdline_auth_info_use_ccache(auth_info);
 140
 141         DEBUG(4,(" session request ok\n"));
 142
 143         status = cli_negprot(c);
 144
 145         if (!NT_STATUS_IS_OK(status)) {
 146                 d_printf("protocol negotiation failed: %s\n",
 147                          nt_errstr(status));
 148                 cli_shutdown(c);
 149                 return status;
 150         }
 151
 152         username = get_cmdline_auth_info_username(auth_info);
 153         password = get_cmdline_auth_info_password(auth_info);
 154
 155         status = cli_session_setup(c, username,
 156                                    password, strlen(password),
 157                                    password, strlen(password),
 158                                    lp_workgroup());
 159         if (!NT_STATUS_IS_OK(status)) {
 160                 /* If a password was not supplied then
 161                  * try again with a null username. */
 162                 if (password[0] || !username[0] ||
 163                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 164                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 165                                                 "", 0,
 166                                                 "", 0,
 167                                                lp_workgroup()))) {
 168                         d_printf("session setup failed: %s\n",
 169                                  nt_errstr(status));
 170                         if (NT_STATUS_V(cli_nt_error(c)) ==
 171                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 172                                 d_printf("did you forget to run kinit?\n");
 173                         cli_shutdown(c);
 174                         return status;
 175                 }
 176                 d_printf("Anonymous login successful\n");
 177                 status = cli_init_creds(c, "", lp_workgroup(), "");
 178         } else {
 179                 status = cli_init_creds(c, username, lp_workgroup(), password);
 180         }
 181
 182         if (!NT_STATUS_IS_OK(status)) {
 183                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 184                 cli_shutdown(c);
 185                 return status;
 186         }
 187
 188         if ( show_sessetup ) {
 189                 if (*c->server_domain) {
 190                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 191                                 c->server_domain,c->server_os,c->server_type));
 192                 } else if (*c->server_os || *c->server_type) {
 193                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 194                                  c->server_os,c->server_type));
 195                 }
 196         }
 197         DEBUG(4,(" session setup ok\n"));
 198
 199         /* here's the fun part....to support 'msdfs proxy' shares
 200            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 201            here before trying to connect to the original share.
 202            cli_check_msdfs_proxy() will fail if it is a normal share. */
 203
 204         if ((c->capabilities & CAP_DFS) &&
 205                         cli_check_msdfs_proxy(ctx, c, sharename,
 206                                 &newserver, &newshare,
 207                                 force_encrypt,
 208                                 username,
 209                                 password,
 210                                 lp_workgroup())) {
 211                 cli_shutdown(c);
 212                 return do_connect(ctx, newserver,
 213                                 newshare, auth_info, false,
 214                                 force_encrypt, max_protocol,
 215                                 port, name_type, pcli);
 216         }
 217
 218         /* must be a normal share */
 219
 220         status = cli_tcon_andx(c, sharename, "?????",
 221                                password, strlen(password)+1);
 222         if (!NT_STATUS_IS_OK(status)) {
 223                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 224                 cli_shutdown(c);
 225                 return status;
 226         }
 227
 228         if (force_encrypt) {
 229                 status = cli_cm_force_encryption(c,
 230                                         username,
 231                                         password,
 232                                         lp_workgroup(),
 233                                         sharename);
 234                 if (!NT_STATUS_IS_OK(status)) {
 235                         cli_shutdown(c);
 236                         return status;
 237                 }
 238         }
 239
 240         DEBUG(4,(" tconx ok\n"));
 241         *pcli = c;
 242         return NT_STATUS_OK;
 243 }
 244
 245 /****************************************************************************
 246 ****************************************************************************/
 247
 248 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 249 {
 250         char *name = clean_name(NULL, mnt);
 251         if (!name) {
 252                 return;
 253         }
 254         TALLOC_FREE(cli->dfs_mountpoint);
 255         cli->dfs_mountpoint = talloc_strdup(cli, name);
 256         TALLOC_FREE(name);
 257 }
 258
 259 /********************************************************************
 260  Add a new connection to the list.
 261  referring_cli == NULL means a new initial connection.
 262 ********************************************************************/
 263
 264 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 265                                struct cli_state *referring_cli,
 266                                const char *server,
 267                                const char *share,
 268                                const struct user_auth_info *auth_info,
 269                                bool show_hdr,
 270                                bool force_encrypt,
 271                                int max_protocol,
 272                                int port,
 273                                int name_type,
 274                                struct cli_state **pcli)
 275 {
 276         struct cli_state *cli;
 277         NTSTATUS status;
 278
 279         status = do_connect(ctx, server, share,
 280                                 auth_info,
 281                                 show_hdr, force_encrypt, max_protocol,
 282                                 port, name_type, &cli);
 283
 284         if (!NT_STATUS_IS_OK(status)) {
 285                 return status;
 286         }
 287
 288         /* Enter into the list. */
 289         if (referring_cli) {
 290                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 291         }
 292
 293         if (referring_cli && referring_cli->requested_posix_capabilities) {
 294                 uint16 major, minor;
 295                 uint32 caplow, caphigh;
 296                 status = cli_unix_extensions_version(cli, &major, &minor,
 297                                                      &caplow, &caphigh);
 298                 if (NT_STATUS_IS_OK(status)) {
 299                         cli_set_unix_extensions_capabilities(cli,
 300                                         major, minor,
 301                                         caplow, caphigh);
 302                 }
 303         }
 304
 305         *pcli = cli;
 306         return NT_STATUS_OK;
 307 }
 308
 309 /********************************************************************
 310  Return a connection to a server on a particular share.
 311 ********************************************************************/
 312
 313 static struct cli_state *cli_cm_find(struct cli_state *cli,
 314                                 const char *server,
 315                                 const char *share)
 316 {
 317         struct cli_state *p;
 318
 319         if (cli == NULL) {
 320                 return NULL;
 321         }
 322
 323         /* Search to the start of the list. */
 324         for (p = cli; p; p = DLIST_PREV(p)) {
 325                 if (strequal(server, p->desthost) &&
 326                                 strequal(share,p->share)) {
 327                         return p;
 328                 }
 329         }
 330
 331         /* Search to the end of the list. */
 332         for (p = cli->next; p; p = p->next) {
 333                 if (strequal(server, p->desthost) &&
 334                                 strequal(share,p->share)) {
 335                         return p;
 336                 }
 337         }
 338
 339         return NULL;
 340 }
 341
 342 /****************************************************************************
 343  Open a client connection to a \\server\share.
 344 ****************************************************************************/
 345
 346 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 347                                 struct cli_state *referring_cli,
 348                                 const char *server,
 349                                 const char *share,
 350                                 const struct user_auth_info *auth_info,
 351                                 bool show_hdr,
 352                                 bool force_encrypt,
 353                                 int max_protocol,
 354                                 int port,
 355                                 int name_type,
 356                                 struct cli_state **pcli)
 357 {
 358         /* Try to reuse an existing connection in this list. */
 359         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 360         NTSTATUS status;
 361
 362         if (c) {
 363                 *pcli = c;
 364                 return NT_STATUS_OK;
 365         }
 366
 367         if (auth_info == NULL) {
 368                 /* Can't do a new connection
 369                  * without auth info. */
 370                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 371                         "without auth info\n",
 372                         server, share );
 373                 return NT_STATUS_INVALID_PARAMETER;
 374         }
 375
 376         status = cli_cm_connect(ctx,
 377                                 referring_cli,
 378                                 server,
 379                                 share,
 380                                 auth_info,
 381                                 show_hdr,
 382                                 force_encrypt,
 383                                 max_protocol,
 384                                 port,
 385                                 name_type,
 386                                 &c);
 387         if (!NT_STATUS_IS_OK(status)) {
 388                 return status;
 389         }
 390         *pcli = c;
 391         return NT_STATUS_OK;
 392 }
 393
 394 /****************************************************************************
 395 ****************************************************************************/
 396
 397 void cli_cm_display(const struct cli_state *cli)
 398 {
 399         int i;
 400
 401         for (i=0; cli; cli = cli->next,i++ ) {
 402                 d_printf("%d:\tserver=%s, share=%s\n",
 403                         i, cli->desthost, cli->share );
 404         }
 405 }
 406
 407 /****************************************************************************
 408 ****************************************************************************/
 409
 410 /****************************************************************************
 411 ****************************************************************************/
 412
 413 #if 0
 414 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 415 {
 416         SAFE_FREE(cm_creds.username);
 417         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 418                                                auth_info));
 419
 420         if (get_cmdline_auth_info_got_pass(auth_info)) {
 421                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 422         }
 423
 424         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 425         cm_creds.fallback_after_kerberos = false;
 426         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 427 }
 428 #endif
 429
 430 /**********************************************************************
 431  split a dfs path into the server, share name, and extrapath components
 432 **********************************************************************/
 433
 434 static bool split_dfs_path(TALLOC_CTX *ctx,
 435                                 const char *nodepath,
 436                                 char **pp_server,
 437                                 char **pp_share,
 438                                 char **pp_extrapath)
 439 {
 440         char *p, *q;
 441         char *path;
 442
 443         *pp_server = NULL;
 444         *pp_share = NULL;
 445         *pp_extrapath = NULL;
 446
 447         path = talloc_strdup(ctx, nodepath);
 448         if (!path) {
 449                 goto fail;
 450         }
 451
 452         if ( path[0] != '\\' ) {
 453                 goto fail;
 454         }
 455
 456         p = strchr_m( path + 1, '\\' );
 457         if ( !p ) {
 458                 goto fail;
 459         }
 460
 461         *p = '\0';
 462         p++;
 463
 464         /* Look for any extra/deep path */
 465         q = strchr_m(p, '\\');
 466         if (q != NULL) {
 467                 *q = '\0';
 468                 q++;
 469                 *pp_extrapath = talloc_strdup(ctx, q);
 470         } else {
 471                 *pp_extrapath = talloc_strdup(ctx, "");
 472         }
 473         if (*pp_extrapath == NULL) {
 474                 goto fail;
 475         }
 476
 477         *pp_share = talloc_strdup(ctx, p);
 478         if (*pp_share == NULL) {
 479                 goto fail;
 480         }
 481
 482         *pp_server = talloc_strdup(ctx, &path[1]);
 483         if (*pp_server == NULL) {
 484                 goto fail;
 485         }
 486
 487         TALLOC_FREE(path);
 488         return true;
 489
 490 fail:
 491         TALLOC_FREE(*pp_share);
 492         TALLOC_FREE(*pp_extrapath);
 493         TALLOC_FREE(path);
 494         return false;
 495 }
 496
 497 /****************************************************************************
 498  Return the original path truncated at the directory component before
 499  the first wildcard character. Trust the caller to provide a NULL
 500  terminated string
 501 ****************************************************************************/
 502
 503 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 504 {
 505         size_t len;
 506         char *p1, *p2, *p;
 507         char *path_out;
 508
 509         /* No absolute paths. */
 510         while (IS_DIRECTORY_SEP(*path)) {
 511                 path++;
 512         }
 513
 514         path_out = talloc_strdup(ctx, path);
 515         if (!path_out) {
 516                 return NULL;
 517         }
 518
 519         p1 = strchr_m(path_out, '*');
 520         p2 = strchr_m(path_out, '?');
 521
 522         if (p1 || p2) {
 523                 if (p1 && p2) {
 524                         p = MIN(p1,p2);
 525                 } else if (!p1) {
 526                         p = p2;
 527                 } else {
 528                         p = p1;
 529                 }
 530                 *p = '\0';
 531
 532                 /* Now go back to the start of this component. */
 533                 p1 = strrchr_m(path_out, '/');
 534                 p2 = strrchr_m(path_out, '\\');
 535                 p = MAX(p1,p2);
 536                 if (p) {
 537                         *p = '\0';
 538                 }
 539         }
 540
 541         /* Strip any trailing separator */
 542
 543         len = strlen(path_out);
 544         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 545                 path_out[len-1] = '\0';
 546         }
 547
 548         return path_out;
 549 }
 550
 551 /****************************************************************************
 552 ****************************************************************************/
 553
 554 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 555                                         struct cli_state *cli,
 556                                         const char *dir)
 557 {
 558         char path_sep = '\\';
 559
 560         /* Ensure the extrapath doesn't start with a separator. */
 561         while (IS_DIRECTORY_SEP(*dir)) {
 562                 dir++;
 563         }
 564
 565         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 566                 path_sep = '/';
 567         }
 568         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 569                         path_sep,
 570                         cli->desthost,
 571                         path_sep,
 572                         cli->share,
 573                         path_sep,
 574                         dir);
 575 }
 576
 577 /********************************************************************
 578  check for dfs referral
 579 ********************************************************************/
 580
 581 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 582                                 NTSTATUS status)
 583 {
 584         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 585
 586         if (!(cli->capabilities & CAP_UNICODE)) {
 587                 return false;
 588         }
 589         if (!(cli->capabilities & CAP_STATUS32)) {
 590                 return false;
 591         }
 592         if (NT_STATUS_EQUAL(status, expected)) {
 593                 return true;
 594         }
 595         return false;
 596 }
 597
 598 /********************************************************************
 599  Get the dfs referral link.
 600 ********************************************************************/
 601
 602 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 603                         struct cli_state *cli,
 604                         const char *path,
 605                         struct client_dfs_referral **refs,
 606                         size_t *num_refs,
 607                         size_t *consumed)
 608 {
 609         unsigned int data_len = 0;
 610         unsigned int param_len = 0;
 611         uint16_t setup[1];
 612         uint16_t recv_flags2;
 613         uint8_t *param = NULL;
 614         uint8_t *rdata = NULL;
 615         char *p;
 616         char *endp;
 617         smb_ucs2_t *path_ucs;
 618         char *consumed_path = NULL;
 619         uint16_t consumed_ucs;
 620         uint16 num_referrals;
 621         struct client_dfs_referral *referrals = NULL;
 622         NTSTATUS status;
 623         TALLOC_CTX *frame = talloc_stackframe();
 624
 625         *num_refs = 0;
 626         *refs = NULL;
 627
 628         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 629
 630         param = talloc_array(talloc_tos(), uint8_t, 2);
 631         if (!param) {
 632                 status = NT_STATUS_NO_MEMORY;
 633                 goto out;
 634         }
 635         SSVAL(param, 0, 0x03);  /* max referral level */
 636
 637         param = trans2_bytes_push_str(param, cli_ucs2(cli),
 638                                       path, strlen(path)+1,
 639                                       NULL);
 640         if (!param) {
 641                 status = NT_STATUS_NO_MEMORY;
 642                 goto out;
 643         }
 644         param_len = talloc_get_size(param);
 645         path_ucs = (smb_ucs2_t *)&param[2];
 646
 647         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 648                            NULL, 0xffff, 0, 0,
 649                            setup, 1, 0,
 650                            param, param_len, 2,
 651                            NULL, 0, cli->max_xmit,
 652                            &recv_flags2,
 653                            NULL, 0, NULL, /* rsetup */
 654                            NULL, 0, NULL,
 655                            &rdata, 4, &data_len);
 656         if (!NT_STATUS_IS_OK(status)) {
 657                 goto out;
 658         }
 659
 660         endp = (char *)rdata + data_len;
 661
 662         consumed_ucs  = SVAL(rdata, 0);
 663         num_referrals = SVAL(rdata, 2);
 664
 665         /* consumed_ucs is the number of bytes
 666          * of the UCS2 path consumed not counting any
 667          * terminating null. We need to convert
 668          * back to unix charset and count again
 669          * to get the number of bytes consumed from
 670          * the incoming path. */
 671
 672         errno = 0;
 673         if (pull_string_talloc(talloc_tos(),
 674                         NULL,
 675                         0,
 676                         &consumed_path,
 677                         path_ucs,
 678                         consumed_ucs,
 679                         STR_UNICODE) == 0) {
 680                 if (errno != 0) {
 681                         status = map_nt_error_from_unix(errno);
 682                 } else {
 683                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 684                 }
 685                 goto out;
 686         }
 687         if (consumed_path == NULL) {
 688                 status = map_nt_error_from_unix(errno);
 689                 goto out;
 690         }
 691         *consumed = strlen(consumed_path);
 692
 693         if (num_referrals != 0) {
 694                 uint16 ref_version;
 695                 uint16 ref_size;
 696                 int i;
 697                 uint16 node_offset;
 698
 699                 referrals = talloc_array(ctx, struct client_dfs_referral,
 700                                          num_referrals);
 701
 702                 if (!referrals) {
 703                         status = NT_STATUS_NO_MEMORY;
 704                         goto out;
 705                 }
 706                 /* start at the referrals array */
 707
 708                 p = (char *)rdata+8;
 709                 for (i=0; i<num_referrals && p < endp; i++) {
 710                         if (p + 18 > endp) {
 711                                 goto out;
 712                         }
 713                         ref_version = SVAL(p, 0);
 714                         ref_size    = SVAL(p, 2);
 715                         node_offset = SVAL(p, 16);
 716
 717                         if (ref_version != 3) {
 718                                 p += ref_size;
 719                                 continue;
 720                         }
 721
 722                         referrals[i].proximity = SVAL(p, 8);
 723                         referrals[i].ttl       = SVAL(p, 10);
 724
 725                         if (p + node_offset > endp) {
 726                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 727                                 goto out;
 728                         }
 729                         clistr_pull_talloc(referrals,
 730                                            (const char *)rdata,
 731                                            recv_flags2,
 732                                            &referrals[i].dfspath,
 733                                            p+node_offset,
 734                                            PTR_DIFF(endp, p+node_offset),
 735                                            STR_TERMINATE|STR_UNICODE);
 736
 737                         if (!referrals[i].dfspath) {
 738                                 status = map_nt_error_from_unix(errno);
 739                                 goto out;
 740                         }
 741                         p += ref_size;
 742                 }
 743                 if (i < num_referrals) {
 744                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 745                         goto out;
 746                 }
 747         }
 748
 749         *num_refs = num_referrals;
 750         *refs = referrals;
 751
 752   out:
 753
 754         TALLOC_FREE(frame);
 755         return status;
 756 }
 757
 758 /********************************************************************
 759 ********************************************************************/
 760
 761 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 762                           const char *mountpt,
 763                           const struct user_auth_info *dfs_auth_info,
 764                           struct cli_state *rootcli,
 765                           const char *path,
 766                           struct cli_state **targetcli,
 767                           char **pp_targetpath)
 768 {
 769         struct client_dfs_referral *refs = NULL;
 770         size_t num_refs = 0;
 771         size_t consumed = 0;
 772         struct cli_state *cli_ipc = NULL;
 773         char *dfs_path = NULL;
 774         char *cleanpath = NULL;
 775         char *extrapath = NULL;
 776         int pathlen;
 777         char *server = NULL;
 778         char *share = NULL;
 779         struct cli_state *newcli = NULL;
 780         char *newpath = NULL;
 781         char *newmount = NULL;
 782         char *ppath = NULL;
 783         SMB_STRUCT_STAT sbuf;
 784         uint32 attributes;
 785         NTSTATUS status;
 786
 787         if ( !rootcli || !path || !targetcli ) {
 788                 return NT_STATUS_INVALID_PARAMETER;
 789         }
 790
 791         /* Don't do anything if this is not a DFS root. */
 792
 793         if ( !rootcli->dfsroot) {
 794                 *targetcli = rootcli;
 795                 *pp_targetpath = talloc_strdup(ctx, path);
 796                 if (!*pp_targetpath) {
 797                         return NT_STATUS_NO_MEMORY;
 798                 }
 799                 return NT_STATUS_OK;
 800         }
 801
 802         *targetcli = NULL;
 803
 804         /* Send a trans2_query_path_info to check for a referral. */
 805
 806         cleanpath = clean_path(ctx, path);
 807         if (!cleanpath) {
 808                 return NT_STATUS_NO_MEMORY;
 809         }
 810
 811         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 812         if (!dfs_path) {
 813                 return NT_STATUS_NO_MEMORY;
 814         }
 815
 816         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 817         if (NT_STATUS_IS_OK(status)) {
 818                 /* This is an ordinary path, just return it. */
 819                 *targetcli = rootcli;
 820                 *pp_targetpath = talloc_strdup(ctx, path);
 821                 if (!*pp_targetpath) {
 822                         return NT_STATUS_NO_MEMORY;
 823                 }
 824                 goto done;
 825         }
 826
 827         /* Special case where client asked for a path that does not exist */
 828
 829         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 830                                 status)) {
 831                 *targetcli = rootcli;
 832                 *pp_targetpath = talloc_strdup(ctx, path);
 833                 if (!*pp_targetpath) {
 834                         return NT_STATUS_NO_MEMORY;
 835                 }
 836                 goto done;
 837         }
 838
 839         /* We got an error, check for DFS referral. */
 840
 841         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 842                                  status)) {
 843                 return status;
 844         }
 845
 846         /* Check for the referral. */
 847
 848         status = cli_cm_open(ctx,
 849                              rootcli,
 850                              rootcli->desthost,
 851                              "IPC$",
 852                              dfs_auth_info,
 853                              false,
 854                              (rootcli->trans_enc_state != NULL),
 855                              rootcli->protocol,
 856                              0,
 857                              0x20,
 858                              &cli_ipc);
 859         if (!NT_STATUS_IS_OK(status)) {
 860                 return status;
 861         }
 862
 863         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 864                                       &num_refs, &consumed);
 865         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 866                 return status;
 867         }
 868
 869         /* Just store the first referral for now. */
 870
 871         if (!refs[0].dfspath) {
 872                 return NT_STATUS_NOT_FOUND;
 873         }
 874         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 875                             &extrapath)) {
 876                 return NT_STATUS_NOT_FOUND;
 877         }
 878
 879         /* Make sure to recreate the original string including any wildcards. */
 880
 881         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 882         if (!dfs_path) {
 883                 return NT_STATUS_NO_MEMORY;
 884         }
 885         pathlen = strlen(dfs_path);
 886         consumed = MIN(pathlen, consumed);
 887         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 888         if (!*pp_targetpath) {
 889                 return NT_STATUS_NO_MEMORY;
 890         }
 891         dfs_path[consumed] = '\0';
 892
 893         /*
 894          * *pp_targetpath is now the unconsumed part of the path.
 895          * dfs_path is now the consumed part of the path
 896          * (in \server\share\path format).
 897          */
 898
 899         /* Open the connection to the target server & share */
 900         status = cli_cm_open(ctx, rootcli,
 901                              server,
 902                              share,
 903                              dfs_auth_info,
 904                              false,
 905                              (rootcli->trans_enc_state != NULL),
 906                              rootcli->protocol,
 907                              0,
 908                              0x20,
 909                              targetcli);
 910         if (!NT_STATUS_IS_OK(status)) {
 911                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 912                         server, share );
 913                 return status;
 914         }
 915
 916         if (extrapath && strlen(extrapath) > 0) {
 917                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 918                 /* put the trailing \ on the path, so to be save we put one in if needed */
 919                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 920                         *pp_targetpath = talloc_asprintf(ctx,
 921                                                   "%s\\%s",
 922                                                   extrapath,
 923                                                   *pp_targetpath);
 924                 } else {
 925                         *pp_targetpath = talloc_asprintf(ctx,
 926                                                   "%s%s",
 927                                                   extrapath,
 928                                                   *pp_targetpath);
 929                 }
 930                 if (!*pp_targetpath) {
 931                         return NT_STATUS_NO_MEMORY;
 932                 }
 933         }
 934
 935         /* parse out the consumed mount path */
 936         /* trim off the \server\share\ */
 937
 938         ppath = dfs_path;
 939
 940         if (*ppath != '\\') {
 941                 d_printf("cli_resolve_path: "
 942                         "dfs_path (%s) not in correct format.\n",
 943                         dfs_path );
 944                 return NT_STATUS_NOT_FOUND;
 945         }
 946
 947         ppath++; /* Now pointing at start of server name. */
 948
 949         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 950                 return NT_STATUS_NOT_FOUND;
 951         }
 952
 953         ppath++; /* Now pointing at start of share name. */
 954
 955         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 956                 return NT_STATUS_NOT_FOUND;
 957         }
 958
 959         ppath++; /* Now pointing at path component. */
 960
 961         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 962         if (!newmount) {
 963                 return NT_STATUS_NOT_FOUND;
 964         }
 965
 966         cli_set_mntpoint(*targetcli, newmount);
 967
 968         /* Check for another dfs referral, note that we are not
 969            checking for loops here. */
 970
 971         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 972                 status = cli_resolve_path(ctx,
 973                                           newmount,
 974                                           dfs_auth_info,
 975                                           *targetcli,
 976                                           *pp_targetpath,
 977                                           &newcli,
 978                                           &newpath);
 979                 if (NT_STATUS_IS_OK(status)) {
 980                         /*
 981                          * When cli_resolve_path returns true here it's always
 982                          * returning the complete path in newpath, so we're done
 983                          * here.
 984                          */
 985                         *targetcli = newcli;
 986                         *pp_targetpath = newpath;
 987                         return status;
 988                 }
 989         }
 990
 991   done:
 992
 993         /* If returning true ensure we return a dfs root full path. */
 994         if ((*targetcli)->dfsroot) {
 995                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 996                 if (!dfs_path) {
 997                         return NT_STATUS_NO_MEMORY;
 998                 }
 999                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1000                 if (*pp_targetpath == NULL) {
1001                         return NT_STATUS_NO_MEMORY;
1002                 }
1003         }
1004
1005         return NT_STATUS_OK;
1006 }
1007
1008 /********************************************************************
1009 ********************************************************************/
1010
1011 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1012                                 struct cli_state *cli,
1013                                 const char *sharename,
1014                                 char **pp_newserver,
1015                                 char **pp_newshare,
1016                                 bool force_encrypt,
1017                                 const char *username,
1018                                 const char *password,
1019                                 const char *domain)
1020 {
1021         struct client_dfs_referral *refs = NULL;
1022         size_t num_refs = 0;
1023         size_t consumed = 0;
1024         char *fullpath = NULL;
1025         bool res;
1026         uint16 cnum;
1027         char *newextrapath = NULL;
1028         NTSTATUS status;
1029
1030         if (!cli || !sharename) {
1031                 return false;
1032         }
1033
1034         cnum = cli_state_get_tid(cli);
1035
1036         /* special case.  never check for a referral on the IPC$ share */
1037
1038         if (strequal(sharename, "IPC$")) {
1039                 return false;
1040         }
1041
1042         /* send a trans2_query_path_info to check for a referral */
1043
1044         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1045         if (!fullpath) {
1046                 return false;
1047         }
1048
1049         /* check for the referral */
1050
1051         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1052                 return false;
1053         }
1054
1055         if (force_encrypt) {
1056                 status = cli_cm_force_encryption(cli,
1057                                         username,
1058                                         password,
1059                                         lp_workgroup(),
1060                                         "IPC$");
1061                 if (!NT_STATUS_IS_OK(status)) {
1062                         return false;
1063                 }
1064         }
1065
1066         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1067                                       &num_refs, &consumed);
1068         res = NT_STATUS_IS_OK(status);
1069
1070         status = cli_tdis(cli);
1071         if (!NT_STATUS_IS_OK(status)) {
1072                 return false;
1073         }
1074
1075         cli_state_set_tid(cli, cnum);
1076
1077         if (!res || !num_refs) {
1078                 return false;
1079         }
1080
1081         if (!refs[0].dfspath) {
1082                 return false;
1083         }
1084
1085         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1086                             pp_newshare, &newextrapath)) {
1087                 return false;
1088         }
1089
1090         /* check that this is not a self-referral */
1091
1092         if (strequal(cli->desthost, *pp_newserver) &&
1093                         strequal(sharename, *pp_newshare)) {
1094                 return false;
1095         }
1096
1097         return true;
1098 }