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 struct cli_state *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 {
  90         struct cli_state *c = NULL;
  91         struct nmb_name called, calling;
  92         const char *called_str;
  93         const char *server_n;
  94         struct sockaddr_storage ss;
  95         char *servicename;
  96         char *sharename;
  97         char *newserver, *newshare;
  98         const char *username;
  99         const char *password;
 100         NTSTATUS status;
 101
 102         /* make a copy so we don't modify the global string 'service' */
 103         servicename = talloc_strdup(ctx,share);
 104         if (!servicename) {
 105                 return NULL;
 106         }
 107         sharename = servicename;
 108         if (*sharename == '\\') {
 109                 sharename += 2;
 110                 called_str = sharename;
 111                 if (server == NULL) {
 112                         server = sharename;
 113                 }
 114                 sharename = strchr_m(sharename,'\\');
 115                 if (!sharename) {
 116                         return NULL;
 117                 }
 118                 *sharename = 0;
 119                 sharename++;
 120         } else {
 121                 called_str = server;
 122         }
 123
 124         server_n = server;
 125
 126         zero_sockaddr(&ss);
 127
 128         make_nmb_name(&calling, global_myname(), 0x0);
 129         make_nmb_name(&called , called_str, name_type);
 130
 131  again:
 132         zero_sockaddr(&ss);
 133
 134         /* have to open a new connection */
 135         c = cli_initialise_ex(get_cmdline_auth_info_signing_state(auth_info));
 136         if (c == NULL) {
 137                 d_printf("Connection to %s failed\n", server_n);
 138                 return NULL;
 139         }
 140         if (port) {
 141                 cli_set_port(c, port);
 142         }
 143
 144         status = cli_connect(c, server_n, &ss);
 145         if (!NT_STATUS_IS_OK(status)) {
 146                 d_printf("Connection to %s failed (Error %s)\n",
 147                                 server_n,
 148                                 nt_errstr(status));
 149                 cli_shutdown(c);
 150                 return NULL;
 151         }
 152
 153         if (max_protocol == 0) {
 154                 max_protocol = PROTOCOL_NT1;
 155         }
 156         c->protocol = max_protocol;
 157         c->use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 158         c->fallback_after_kerberos =
 159                 get_cmdline_auth_info_fallback_after_kerberos(auth_info);
 160         c->use_ccache = get_cmdline_auth_info_use_ccache(auth_info);
 161
 162         if (!cli_session_request(c, &calling, &called)) {
 163                 char *p;
 164                 d_printf("session request to %s failed (%s)\n",
 165                          called.name, cli_errstr(c));
 166                 cli_shutdown(c);
 167                 c = NULL;
 168                 if ((p=strchr_m(called.name, '.'))) {
 169                         *p = 0;
 170                         goto again;
 171                 }
 172                 if (strcmp(called.name, "*SMBSERVER")) {
 173                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 174                         goto again;
 175                 }
 176                 return NULL;
 177         }
 178
 179         DEBUG(4,(" session request ok\n"));
 180
 181         status = cli_negprot(c);
 182
 183         if (!NT_STATUS_IS_OK(status)) {
 184                 d_printf("protocol negotiation failed: %s\n",
 185                          nt_errstr(status));
 186                 cli_shutdown(c);
 187                 return NULL;
 188         }
 189
 190         username = get_cmdline_auth_info_username(auth_info);
 191         password = get_cmdline_auth_info_password(auth_info);
 192
 193         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 194                                                password, strlen(password),
 195                                                password, strlen(password),
 196                                                lp_workgroup()))) {
 197                 /* If a password was not supplied then
 198                  * try again with a null username. */
 199                 if (password[0] || !username[0] ||
 200                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 201                         !NT_STATUS_IS_OK(cli_session_setup(c, "",
 202                                                 "", 0,
 203                                                 "", 0,
 204                                                lp_workgroup()))) {
 205                         d_printf("session setup failed: %s\n", cli_errstr(c));
 206                         if (NT_STATUS_V(cli_nt_error(c)) ==
 207                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 208                                 d_printf("did you forget to run kinit?\n");
 209                         cli_shutdown(c);
 210                         return NULL;
 211                 }
 212                 d_printf("Anonymous login successful\n");
 213                 status = cli_init_creds(c, "", lp_workgroup(), "");
 214         } else {
 215                 status = cli_init_creds(c, username, lp_workgroup(), password);
 216         }
 217
 218         if (!NT_STATUS_IS_OK(status)) {
 219                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 220                 cli_shutdown(c);
 221                 return NULL;
 222         }
 223
 224         if ( show_sessetup ) {
 225                 if (*c->server_domain) {
 226                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 227                                 c->server_domain,c->server_os,c->server_type));
 228                 } else if (*c->server_os || *c->server_type) {
 229                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 230                                  c->server_os,c->server_type));
 231                 }
 232         }
 233         DEBUG(4,(" session setup ok\n"));
 234
 235         /* here's the fun part....to support 'msdfs proxy' shares
 236            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 237            here before trying to connect to the original share.
 238            cli_check_msdfs_proxy() will fail if it is a normal share. */
 239
 240         if ((c->capabilities & CAP_DFS) &&
 241                         cli_check_msdfs_proxy(ctx, c, sharename,
 242                                 &newserver, &newshare,
 243                                 force_encrypt,
 244                                 username,
 245                                 password,
 246                                 lp_workgroup())) {
 247                 cli_shutdown(c);
 248                 return do_connect(ctx, newserver,
 249                                 newshare, auth_info, false,
 250                                 force_encrypt, max_protocol,
 251                                 port, name_type);
 252         }
 253
 254         /* must be a normal share */
 255
 256         status = cli_tcon_andx(c, sharename, "?????",
 257                                password, strlen(password)+1);
 258         if (!NT_STATUS_IS_OK(status)) {
 259                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 260                 cli_shutdown(c);
 261                 return NULL;
 262         }
 263
 264         if (force_encrypt) {
 265                 status = cli_cm_force_encryption(c,
 266                                         username,
 267                                         password,
 268                                         lp_workgroup(),
 269                                         sharename);
 270                 if (!NT_STATUS_IS_OK(status)) {
 271                         cli_shutdown(c);
 272                         return NULL;
 273                 }
 274         }
 275
 276         DEBUG(4,(" tconx ok\n"));
 277         return c;
 278 }
 279
 280 /****************************************************************************
 281 ****************************************************************************/
 282
 283 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 284 {
 285         char *name = clean_name(NULL, mnt);
 286         if (!name) {
 287                 return;
 288         }
 289         TALLOC_FREE(cli->dfs_mountpoint);
 290         cli->dfs_mountpoint = talloc_strdup(cli, name);
 291         TALLOC_FREE(name);
 292 }
 293
 294 /********************************************************************
 295  Add a new connection to the list.
 296  referring_cli == NULL means a new initial connection.
 297 ********************************************************************/
 298
 299 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 300                                         struct cli_state *referring_cli,
 301                                         const char *server,
 302                                         const char *share,
 303                                         const struct user_auth_info *auth_info,
 304                                         bool show_hdr,
 305                                         bool force_encrypt,
 306                                         int max_protocol,
 307                                         int port,
 308                                         int name_type)
 309 {
 310         struct cli_state *cli;
 311
 312         cli = do_connect(ctx, server, share,
 313                                 auth_info,
 314                                 show_hdr, force_encrypt, max_protocol,
 315                                 port, name_type);
 316
 317         if (!cli ) {
 318                 return NULL;
 319         }
 320
 321         /* Enter into the list. */
 322         if (referring_cli) {
 323                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 324         }
 325
 326         if (referring_cli && referring_cli->requested_posix_capabilities) {
 327                 uint16 major, minor;
 328                 uint32 caplow, caphigh;
 329                 NTSTATUS status;
 330                 status = cli_unix_extensions_version(cli, &major, &minor,
 331                                                      &caplow, &caphigh);
 332                 if (NT_STATUS_IS_OK(status)) {
 333                         cli_set_unix_extensions_capabilities(cli,
 334                                         major, minor,
 335                                         caplow, caphigh);
 336                 }
 337         }
 338
 339         return cli;
 340 }
 341
 342 /********************************************************************
 343  Return a connection to a server on a particular share.
 344 ********************************************************************/
 345
 346 static struct cli_state *cli_cm_find(struct cli_state *cli,
 347                                 const char *server,
 348                                 const char *share)
 349 {
 350         struct cli_state *p;
 351
 352         if (cli == NULL) {
 353                 return NULL;
 354         }
 355
 356         /* Search to the start of the list. */
 357         for (p = cli; p; p = DLIST_PREV(p)) {
 358                 if (strequal(server, p->desthost) &&
 359                                 strequal(share,p->share)) {
 360                         return p;
 361                 }
 362         }
 363
 364         /* Search to the end of the list. */
 365         for (p = cli->next; p; p = p->next) {
 366                 if (strequal(server, p->desthost) &&
 367                                 strequal(share,p->share)) {
 368                         return p;
 369                 }
 370         }
 371
 372         return NULL;
 373 }
 374
 375 /****************************************************************************
 376  Open a client connection to a \\server\share.
 377 ****************************************************************************/
 378
 379 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 380                                 struct cli_state *referring_cli,
 381                                 const char *server,
 382                                 const char *share,
 383                                 const struct user_auth_info *auth_info,
 384                                 bool show_hdr,
 385                                 bool force_encrypt,
 386                                 int max_protocol,
 387                                 int port,
 388                                 int name_type)
 389 {
 390         /* Try to reuse an existing connection in this list. */
 391         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 392
 393         if (c) {
 394                 return c;
 395         }
 396
 397         if (auth_info == NULL) {
 398                 /* Can't do a new connection
 399                  * without auth info. */
 400                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 401                         "without auth info\n",
 402                         server, share );
 403                 return NULL;
 404         }
 405
 406         return cli_cm_connect(ctx,
 407                                 referring_cli,
 408                                 server,
 409                                 share,
 410                                 auth_info,
 411                                 show_hdr,
 412                                 force_encrypt,
 413                                 max_protocol,
 414                                 port,
 415                                 name_type);
 416 }
 417
 418 /****************************************************************************
 419 ****************************************************************************/
 420
 421 void cli_cm_display(const struct cli_state *cli)
 422 {
 423         int i;
 424
 425         for (i=0; cli; cli = cli->next,i++ ) {
 426                 d_printf("%d:\tserver=%s, share=%s\n",
 427                         i, cli->desthost, cli->share );
 428         }
 429 }
 430
 431 /****************************************************************************
 432 ****************************************************************************/
 433
 434 /****************************************************************************
 435 ****************************************************************************/
 436
 437 #if 0
 438 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 439 {
 440         SAFE_FREE(cm_creds.username);
 441         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 442                                                auth_info));
 443
 444         if (get_cmdline_auth_info_got_pass(auth_info)) {
 445                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 446         }
 447
 448         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 449         cm_creds.fallback_after_kerberos = false;
 450         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 451 }
 452 #endif
 453
 454 /**********************************************************************
 455  split a dfs path into the server, share name, and extrapath components
 456 **********************************************************************/
 457
 458 static bool split_dfs_path(TALLOC_CTX *ctx,
 459                                 const char *nodepath,
 460                                 char **pp_server,
 461                                 char **pp_share,
 462                                 char **pp_extrapath)
 463 {
 464         char *p, *q;
 465         char *path;
 466
 467         *pp_server = NULL;
 468         *pp_share = NULL;
 469         *pp_extrapath = NULL;
 470
 471         path = talloc_strdup(ctx, nodepath);
 472         if (!path) {
 473                 goto fail;
 474         }
 475
 476         if ( path[0] != '\\' ) {
 477                 goto fail;
 478         }
 479
 480         p = strchr_m( path + 1, '\\' );
 481         if ( !p ) {
 482                 goto fail;
 483         }
 484
 485         *p = '\0';
 486         p++;
 487
 488         /* Look for any extra/deep path */
 489         q = strchr_m(p, '\\');
 490         if (q != NULL) {
 491                 *q = '\0';
 492                 q++;
 493                 *pp_extrapath = talloc_strdup(ctx, q);
 494         } else {
 495                 *pp_extrapath = talloc_strdup(ctx, "");
 496         }
 497         if (*pp_extrapath == NULL) {
 498                 goto fail;
 499         }
 500
 501         *pp_share = talloc_strdup(ctx, p);
 502         if (*pp_share == NULL) {
 503                 goto fail;
 504         }
 505
 506         *pp_server = talloc_strdup(ctx, &path[1]);
 507         if (*pp_server == NULL) {
 508                 goto fail;
 509         }
 510
 511         TALLOC_FREE(path);
 512         return true;
 513
 514 fail:
 515         TALLOC_FREE(*pp_share);
 516         TALLOC_FREE(*pp_extrapath);
 517         TALLOC_FREE(path);
 518         return false;
 519 }
 520
 521 /****************************************************************************
 522  Return the original path truncated at the directory component before
 523  the first wildcard character. Trust the caller to provide a NULL
 524  terminated string
 525 ****************************************************************************/
 526
 527 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 528 {
 529         size_t len;
 530         char *p1, *p2, *p;
 531         char *path_out;
 532
 533         /* No absolute paths. */
 534         while (IS_DIRECTORY_SEP(*path)) {
 535                 path++;
 536         }
 537
 538         path_out = talloc_strdup(ctx, path);
 539         if (!path_out) {
 540                 return NULL;
 541         }
 542
 543         p1 = strchr_m(path_out, '*');
 544         p2 = strchr_m(path_out, '?');
 545
 546         if (p1 || p2) {
 547                 if (p1 && p2) {
 548                         p = MIN(p1,p2);
 549                 } else if (!p1) {
 550                         p = p2;
 551                 } else {
 552                         p = p1;
 553                 }
 554                 *p = '\0';
 555
 556                 /* Now go back to the start of this component. */
 557                 p1 = strrchr_m(path_out, '/');
 558                 p2 = strrchr_m(path_out, '\\');
 559                 p = MAX(p1,p2);
 560                 if (p) {
 561                         *p = '\0';
 562                 }
 563         }
 564
 565         /* Strip any trailing separator */
 566
 567         len = strlen(path_out);
 568         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 569                 path_out[len-1] = '\0';
 570         }
 571
 572         return path_out;
 573 }
 574
 575 /****************************************************************************
 576 ****************************************************************************/
 577
 578 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 579                                         struct cli_state *cli,
 580                                         const char *dir)
 581 {
 582         char path_sep = '\\';
 583
 584         /* Ensure the extrapath doesn't start with a separator. */
 585         while (IS_DIRECTORY_SEP(*dir)) {
 586                 dir++;
 587         }
 588
 589         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 590                 path_sep = '/';
 591         }
 592         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 593                         path_sep,
 594                         cli->desthost,
 595                         path_sep,
 596                         cli->share,
 597                         path_sep,
 598                         dir);
 599 }
 600
 601 /********************************************************************
 602  check for dfs referral
 603 ********************************************************************/
 604
 605 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 606                                 NTSTATUS status)
 607 {
 608         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 609
 610         if (!(cli->capabilities & CAP_UNICODE)) {
 611                 return false;
 612         }
 613         if (!(cli->capabilities & CAP_STATUS32)) {
 614                 return false;
 615         }
 616         if (NT_STATUS_EQUAL(status, expected)) {
 617                 return true;
 618         }
 619         return false;
 620 }
 621
 622 /********************************************************************
 623  Get the dfs referral link.
 624 ********************************************************************/
 625
 626 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 627                         struct cli_state *cli,
 628                         const char *path,
 629                         struct client_dfs_referral **refs,
 630                         size_t *num_refs,
 631                         size_t *consumed)
 632 {
 633         unsigned int data_len = 0;
 634         unsigned int param_len = 0;
 635         uint16 setup[1];
 636         uint8_t *param = NULL;
 637         uint8_t *rdata = NULL;
 638         char *p;
 639         char *endp;
 640         size_t pathlen = 2*(strlen(path)+1);
 641         smb_ucs2_t *path_ucs;
 642         char *consumed_path = NULL;
 643         uint16_t consumed_ucs;
 644         uint16 num_referrals;
 645         struct client_dfs_referral *referrals = NULL;
 646         NTSTATUS status;
 647
 648         *num_refs = 0;
 649         *refs = NULL;
 650
 651         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 652
 653         param = SMB_MALLOC_ARRAY(uint8_t, 2+pathlen+2);
 654         if (!param) {
 655                 status = NT_STATUS_NO_MEMORY;
 656                 goto out;
 657         }
 658         SSVAL(param, 0, 0x03);  /* max referral level */
 659         p = (char *)(&param[2]);
 660
 661         path_ucs = (smb_ucs2_t *)p;
 662         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 663         param_len = PTR_DIFF(p, param);
 664
 665         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 666                            NULL, 0xffff, 0, 0,
 667                            setup, 1, 0,
 668                            param, param_len, 2,
 669                            NULL, 0, cli->max_xmit,
 670                            NULL,
 671                            NULL, 0, NULL, /* rsetup */
 672                            NULL, 0, NULL,
 673                            &rdata, 4, &data_len);
 674         if (!NT_STATUS_IS_OK(status)) {
 675                 goto out;
 676         }
 677         if (data_len < 4) {
 678                 goto out;
 679         }
 680
 681         endp = (char *)rdata + data_len;
 682
 683         consumed_ucs  = SVAL(rdata, 0);
 684         num_referrals = SVAL(rdata, 2);
 685
 686         /* consumed_ucs is the number of bytes
 687          * of the UCS2 path consumed not counting any
 688          * terminating null. We need to convert
 689          * back to unix charset and count again
 690          * to get the number of bytes consumed from
 691          * the incoming path. */
 692
 693         if (pull_string_talloc(talloc_tos(),
 694                         NULL,
 695                         0,
 696                         &consumed_path,
 697                         path_ucs,
 698                         consumed_ucs,
 699                         STR_UNICODE) == 0) {
 700                 goto out;
 701         }
 702         if (consumed_path == NULL) {
 703                 goto out;
 704         }
 705         *consumed = strlen(consumed_path);
 706
 707         if (num_referrals != 0) {
 708                 uint16 ref_version;
 709                 uint16 ref_size;
 710                 int i;
 711                 uint16 node_offset;
 712
 713                 referrals = talloc_array(ctx, struct client_dfs_referral,
 714                                          num_referrals);
 715
 716                 if (!referrals) {
 717                         goto out;
 718                 }
 719                 /* start at the referrals array */
 720
 721                 p = (char *)rdata+8;
 722                 for (i=0; i<num_referrals && p < endp; i++) {
 723                         if (p + 18 > endp) {
 724                                 goto out;
 725                         }
 726                         ref_version = SVAL(p, 0);
 727                         ref_size    = SVAL(p, 2);
 728                         node_offset = SVAL(p, 16);
 729
 730                         if (ref_version != 3) {
 731                                 p += ref_size;
 732                                 continue;
 733                         }
 734
 735                         referrals[i].proximity = SVAL(p, 8);
 736                         referrals[i].ttl       = SVAL(p, 10);
 737
 738                         if (p + node_offset > endp) {
 739                                 goto out;
 740                         }
 741                         clistr_pull_talloc(ctx, cli->inbuf,
 742                                            SVAL(cli->inbuf, smb_flg2),
 743                                            &referrals[i].dfspath,
 744                                            p+node_offset, -1,
 745                                            STR_TERMINATE|STR_UNICODE);
 746
 747                         if (!referrals[i].dfspath) {
 748                                 goto out;
 749                         }
 750                         p += ref_size;
 751                 }
 752                 if (i < num_referrals) {
 753                         goto out;
 754                 }
 755         }
 756
 757         *num_refs = num_referrals;
 758         *refs = referrals;
 759
 760   out:
 761
 762         TALLOC_FREE(consumed_path);
 763         SAFE_FREE(param);
 764         TALLOC_FREE(rdata);
 765         return status;
 766 }
 767
 768 /********************************************************************
 769 ********************************************************************/
 770
 771 bool cli_resolve_path(TALLOC_CTX *ctx,
 772                         const char *mountpt,
 773                         const struct user_auth_info *dfs_auth_info,
 774                         struct cli_state *rootcli,
 775                         const char *path,
 776                         struct cli_state **targetcli,
 777                         char **pp_targetpath)
 778 {
 779         struct client_dfs_referral *refs = NULL;
 780         size_t num_refs = 0;
 781         size_t consumed = 0;
 782         struct cli_state *cli_ipc = NULL;
 783         char *dfs_path = NULL;
 784         char *cleanpath = NULL;
 785         char *extrapath = NULL;
 786         int pathlen;
 787         char *server = NULL;
 788         char *share = NULL;
 789         struct cli_state *newcli = NULL;
 790         char *newpath = NULL;
 791         char *newmount = NULL;
 792         char *ppath = NULL;
 793         SMB_STRUCT_STAT sbuf;
 794         uint32 attributes;
 795         NTSTATUS status;
 796
 797         if ( !rootcli || !path || !targetcli ) {
 798                 return false;
 799         }
 800
 801         /* Don't do anything if this is not a DFS root. */
 802
 803         if ( !rootcli->dfsroot) {
 804                 *targetcli = rootcli;
 805                 *pp_targetpath = talloc_strdup(ctx, path);
 806                 if (!*pp_targetpath) {
 807                         return false;
 808                 }
 809                 return true;
 810         }
 811
 812         *targetcli = NULL;
 813
 814         /* Send a trans2_query_path_info to check for a referral. */
 815
 816         cleanpath = clean_path(ctx, path);
 817         if (!cleanpath) {
 818                 return false;
 819         }
 820
 821         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 822         if (!dfs_path) {
 823                 return false;
 824         }
 825
 826         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 827         if (NT_STATUS_IS_OK(status)) {
 828                 /* This is an ordinary path, just return it. */
 829                 *targetcli = rootcli;
 830                 *pp_targetpath = talloc_strdup(ctx, path);
 831                 if (!*pp_targetpath) {
 832                         return false;
 833                 }
 834                 goto done;
 835         }
 836
 837         /* Special case where client asked for a path that does not exist */
 838
 839         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 840                                 status)) {
 841                 *targetcli = rootcli;
 842                 *pp_targetpath = talloc_strdup(ctx, path);
 843                 if (!*pp_targetpath) {
 844                         return false;
 845                 }
 846                 goto done;
 847         }
 848
 849         /* We got an error, check for DFS referral. */
 850
 851         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 852                                  status)) {
 853                 return false;
 854         }
 855
 856         /* Check for the referral. */
 857
 858         if (!(cli_ipc = cli_cm_open(ctx,
 859                                 rootcli,
 860                                 rootcli->desthost,
 861                                 "IPC$",
 862                                 dfs_auth_info,
 863                                 false,
 864                                 (rootcli->trans_enc_state != NULL),
 865                                 rootcli->protocol,
 866                                 0,
 867                                 0x20))) {
 868                 return false;
 869         }
 870
 871         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 872                                       &num_refs, &consumed);
 873         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 874                 return false;
 875         }
 876
 877         /* Just store the first referral for now. */
 878
 879         if (!refs[0].dfspath) {
 880                 return false;
 881         }
 882         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 883                             &extrapath)) {
 884                 return false;
 885         }
 886
 887         /* Make sure to recreate the original string including any wildcards. */
 888
 889         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 890         if (!dfs_path) {
 891                 return false;
 892         }
 893         pathlen = strlen(dfs_path);
 894         consumed = MIN(pathlen, consumed);
 895         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 896         if (!*pp_targetpath) {
 897                 return false;
 898         }
 899         dfs_path[consumed] = '\0';
 900
 901         /*
 902          * *pp_targetpath is now the unconsumed part of the path.
 903          * dfs_path is now the consumed part of the path
 904          * (in \server\share\path format).
 905          */
 906
 907         /* Open the connection to the target server & share */
 908         if ((*targetcli = cli_cm_open(ctx, rootcli,
 909                                         server,
 910                                         share,
 911                                         dfs_auth_info,
 912                                         false,
 913                                         (rootcli->trans_enc_state != NULL),
 914                                         rootcli->protocol,
 915                                         0,
 916                                         0x20)) == NULL) {
 917                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 918                         server, share );
 919                 return false;
 920         }
 921
 922         if (extrapath && strlen(extrapath) > 0) {
 923                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 924                 /* put the trailing \ on the path, so to be save we put one in if needed */
 925                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 926                         *pp_targetpath = talloc_asprintf(ctx,
 927                                                   "%s\\%s",
 928                                                   extrapath,
 929                                                   *pp_targetpath);
 930                 } else {
 931                         *pp_targetpath = talloc_asprintf(ctx,
 932                                                   "%s%s",
 933                                                   extrapath,
 934                                                   *pp_targetpath);
 935                 }
 936                 if (!*pp_targetpath) {
 937                         return false;
 938                 }
 939         }
 940
 941         /* parse out the consumed mount path */
 942         /* trim off the \server\share\ */
 943
 944         ppath = dfs_path;
 945
 946         if (*ppath != '\\') {
 947                 d_printf("cli_resolve_path: "
 948                         "dfs_path (%s) not in correct format.\n",
 949                         dfs_path );
 950                 return false;
 951         }
 952
 953         ppath++; /* Now pointing at start of server name. */
 954
 955         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 956                 return false;
 957         }
 958
 959         ppath++; /* Now pointing at start of share name. */
 960
 961         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 962                 return false;
 963         }
 964
 965         ppath++; /* Now pointing at path component. */
 966
 967         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 968         if (!newmount) {
 969                 return false;
 970         }
 971
 972         cli_set_mntpoint(*targetcli, newmount);
 973
 974         /* Check for another dfs referral, note that we are not
 975            checking for loops here. */
 976
 977         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 978                 if (cli_resolve_path(ctx,
 979                                         newmount,
 980                                         dfs_auth_info,
 981                                         *targetcli,
 982                                         *pp_targetpath,
 983                                         &newcli,
 984                                         &newpath)) {
 985                         /*
 986                          * When cli_resolve_path returns true here it's always
 987                          * returning the complete path in newpath, so we're done
 988                          * here.
 989                          */
 990                         *targetcli = newcli;
 991                         *pp_targetpath = newpath;
 992                         return true;
 993                 }
 994         }
 995
 996   done:
 997
 998         /* If returning true ensure we return a dfs root full path. */
 999         if ((*targetcli)->dfsroot) {
1000                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1001                 if (!dfs_path) {
1002                         return false;
1003                 }
1004                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1005         }
1006
1007         return true;
1008 }
1009
1010 /********************************************************************
1011 ********************************************************************/
1012
1013 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1014                                 struct cli_state *cli,
1015                                 const char *sharename,
1016                                 char **pp_newserver,
1017                                 char **pp_newshare,
1018                                 bool force_encrypt,
1019                                 const char *username,
1020                                 const char *password,
1021                                 const char *domain)
1022 {
1023         struct client_dfs_referral *refs = NULL;
1024         size_t num_refs = 0;
1025         size_t consumed = 0;
1026         char *fullpath = NULL;
1027         bool res;
1028         uint16 cnum;
1029         char *newextrapath = NULL;
1030         NTSTATUS status;
1031
1032         if (!cli || !sharename) {
1033                 return false;
1034         }
1035
1036         cnum = cli->cnum;
1037
1038         /* special case.  never check for a referral on the IPC$ share */
1039
1040         if (strequal(sharename, "IPC$")) {
1041                 return false;
1042         }
1043
1044         /* send a trans2_query_path_info to check for a referral */
1045
1046         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1047         if (!fullpath) {
1048                 return false;
1049         }
1050
1051         /* check for the referral */
1052
1053         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1054                 return false;
1055         }
1056
1057         if (force_encrypt) {
1058                 status = cli_cm_force_encryption(cli,
1059                                         username,
1060                                         password,
1061                                         lp_workgroup(),
1062                                         "IPC$");
1063                 if (!NT_STATUS_IS_OK(status)) {
1064                         return false;
1065                 }
1066         }
1067
1068         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1069                                       &num_refs, &consumed);
1070         res = NT_STATUS_IS_OK(status);
1071
1072         status = cli_tdis(cli);
1073         if (!NT_STATUS_IS_OK(status)) {
1074                 return false;
1075         }
1076
1077         cli->cnum = cnum;
1078
1079         if (!res || !num_refs) {
1080                 return false;
1081         }
1082
1083         if (!refs[0].dfspath) {
1084                 return false;
1085         }
1086
1087         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1088                             pp_newshare, &newextrapath)) {
1089                 return false;
1090         }
1091
1092         /* check that this is not a self-referral */
1093
1094         if (strequal(cli->desthost, *pp_newserver) &&
1095                         strequal(sharename, *pp_newshare)) {
1096                 return false;
1097         }
1098
1099         return true;
1100 }