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/clirap.h"
  24 #include "msdfs.h"
  25 #include "trans2.h"
  26
  27 /********************************************************************
  28  Important point.
  29
  30  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  31  are not C escaped here).
  32
  33  - but if we're using POSIX paths then <pathname> may contain
  34    '/' separators, not '\\' separators. So cope with '\\' or '/'
  35    as a separator when looking at the pathname part.... JRA.
  36 ********************************************************************/
  37
  38 /********************************************************************
  39  Ensure a connection is encrypted.
  40 ********************************************************************/
  41
  42 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  43                         const char *username,
  44                         const char *password,
  45                         const char *domain,
  46                         const char *sharename)
  47 {
  48         NTSTATUS status = cli_force_encryption(c,
  49                                         username,
  50                                         password,
  51                                         domain);
  52
  53         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  54                 d_printf("Encryption required and "
  55                         "server that doesn't support "
  56                         "UNIX extensions - failing connect\n");
  57         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  58                 d_printf("Encryption required and "
  59                         "can't get UNIX CIFS extensions "
  60                         "version from server.\n");
  61         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  62                 d_printf("Encryption required and "
  63                         "share %s doesn't support "
  64                         "encryption.\n", sharename);
  65         } else if (!NT_STATUS_IS_OK(status)) {
  66                 d_printf("Encryption required and "
  67                         "setup failed with error %s.\n",
  68                         nt_errstr(status));
  69         }
  70
  71         return status;
  72 }
  73
  74 /********************************************************************
  75  Return a connection to a server.
  76 ********************************************************************/
  77
  78 static struct cli_state *do_connect(TALLOC_CTX *ctx,
  79                                         const char *server,
  80                                         const char *share,
  81                                         const struct user_auth_info *auth_info,
  82                                         bool show_sessetup,
  83                                         bool force_encrypt,
  84                                         int max_protocol,
  85                                         int port,
  86                                         int name_type)
  87 {
  88         struct cli_state *c = NULL;
  89         struct nmb_name called, calling;
  90         const char *called_str;
  91         const char *server_n;
  92         struct sockaddr_storage ss;
  93         char *servicename;
  94         char *sharename;
  95         char *newserver, *newshare;
  96         const char *username;
  97         const char *password;
  98         NTSTATUS status;
  99
 100         /* make a copy so we don't modify the global string 'service' */
 101         servicename = talloc_strdup(ctx,share);
 102         if (!servicename) {
 103                 return NULL;
 104         }
 105         sharename = servicename;
 106         if (*sharename == '\\') {
 107                 sharename += 2;
 108                 called_str = sharename;
 109                 if (server == NULL) {
 110                         server = sharename;
 111                 }
 112                 sharename = strchr_m(sharename,'\\');
 113                 if (!sharename) {
 114                         return NULL;
 115                 }
 116                 *sharename = 0;
 117                 sharename++;
 118         } else {
 119                 called_str = server;
 120         }
 121
 122         server_n = server;
 123
 124         zero_sockaddr(&ss);
 125
 126         make_nmb_name(&calling, global_myname(), 0x0);
 127         make_nmb_name(&called , called_str, name_type);
 128
 129  again:
 130         zero_sockaddr(&ss);
 131
 132         /* have to open a new connection */
 133         c = cli_initialise_ex(get_cmdline_auth_info_signing_state(auth_info));
 134         if (c == NULL) {
 135                 d_printf("Connection to %s failed\n", server_n);
 136                 return NULL;
 137         }
 138         if (port) {
 139                 cli_set_port(c, port);
 140         }
 141
 142         status = cli_connect(c, server_n, &ss);
 143         if (!NT_STATUS_IS_OK(status)) {
 144                 d_printf("Connection to %s failed (Error %s)\n",
 145                                 server_n,
 146                                 nt_errstr(status));
 147                 cli_shutdown(c);
 148                 return NULL;
 149         }
 150
 151         if (max_protocol == 0) {
 152                 max_protocol = PROTOCOL_NT1;
 153         }
 154         c->protocol = max_protocol;
 155         c->use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 156         c->fallback_after_kerberos =
 157                 get_cmdline_auth_info_fallback_after_kerberos(auth_info);
 158         c->use_ccache = get_cmdline_auth_info_use_ccache(auth_info);
 159
 160         if (!cli_session_request(c, &calling, &called)) {
 161                 char *p;
 162                 d_printf("session request to %s failed (%s)\n",
 163                          called.name, cli_errstr(c));
 164                 cli_shutdown(c);
 165                 c = NULL;
 166                 if ((p=strchr_m(called.name, '.'))) {
 167                         *p = 0;
 168                         goto again;
 169                 }
 170                 if (strcmp(called.name, "*SMBSERVER")) {
 171                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 172                         goto again;
 173                 }
 174                 return NULL;
 175         }
 176
 177         DEBUG(4,(" session request ok\n"));
 178
 179         status = cli_negprot(c);
 180
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 d_printf("protocol negotiation failed: %s\n",
 183                          nt_errstr(status));
 184                 cli_shutdown(c);
 185                 return NULL;
 186         }
 187
 188         username = get_cmdline_auth_info_username(auth_info);
 189         password = get_cmdline_auth_info_password(auth_info);
 190
 191         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 192                                                password, strlen(password),
 193                                                password, strlen(password),
 194                                                lp_workgroup()))) {
 195                 /* If a password was not supplied then
 196                  * try again with a null username. */
 197                 if (password[0] || !username[0] ||
 198                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 199                         !NT_STATUS_IS_OK(cli_session_setup(c, "",
 200                                                 "", 0,
 201                                                 "", 0,
 202                                                lp_workgroup()))) {
 203                         d_printf("session setup failed: %s\n", cli_errstr(c));
 204                         if (NT_STATUS_V(cli_nt_error(c)) ==
 205                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 206                                 d_printf("did you forget to run kinit?\n");
 207                         cli_shutdown(c);
 208                         return NULL;
 209                 }
 210                 d_printf("Anonymous login successful\n");
 211                 status = cli_init_creds(c, "", lp_workgroup(), "");
 212         } else {
 213                 status = cli_init_creds(c, username, lp_workgroup(), password);
 214         }
 215
 216         if (!NT_STATUS_IS_OK(status)) {
 217                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 218                 cli_shutdown(c);
 219                 return NULL;
 220         }
 221
 222         if ( show_sessetup ) {
 223                 if (*c->server_domain) {
 224                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 225                                 c->server_domain,c->server_os,c->server_type));
 226                 } else if (*c->server_os || *c->server_type) {
 227                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 228                                  c->server_os,c->server_type));
 229                 }
 230         }
 231         DEBUG(4,(" session setup ok\n"));
 232
 233         /* here's the fun part....to support 'msdfs proxy' shares
 234            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 235            here before trying to connect to the original share.
 236            cli_check_msdfs_proxy() will fail if it is a normal share. */
 237
 238         if ((c->capabilities & CAP_DFS) &&
 239                         cli_check_msdfs_proxy(ctx, c, sharename,
 240                                 &newserver, &newshare,
 241                                 force_encrypt,
 242                                 username,
 243                                 password,
 244                                 lp_workgroup())) {
 245                 cli_shutdown(c);
 246                 return do_connect(ctx, newserver,
 247                                 newshare, auth_info, false,
 248                                 force_encrypt, max_protocol,
 249                                 port, name_type);
 250         }
 251
 252         /* must be a normal share */
 253
 254         status = cli_tcon_andx(c, sharename, "?????",
 255                                password, strlen(password)+1);
 256         if (!NT_STATUS_IS_OK(status)) {
 257                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 258                 cli_shutdown(c);
 259                 return NULL;
 260         }
 261
 262         if (force_encrypt) {
 263                 status = cli_cm_force_encryption(c,
 264                                         username,
 265                                         password,
 266                                         lp_workgroup(),
 267                                         sharename);
 268                 if (!NT_STATUS_IS_OK(status)) {
 269                         cli_shutdown(c);
 270                         return NULL;
 271                 }
 272         }
 273
 274         DEBUG(4,(" tconx ok\n"));
 275         return c;
 276 }
 277
 278 /****************************************************************************
 279 ****************************************************************************/
 280
 281 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 282 {
 283         char *name = clean_name(NULL, mnt);
 284         if (!name) {
 285                 return;
 286         }
 287         TALLOC_FREE(cli->dfs_mountpoint);
 288         cli->dfs_mountpoint = talloc_strdup(cli, name);
 289         TALLOC_FREE(name);
 290 }
 291
 292 /********************************************************************
 293  Add a new connection to the list.
 294  referring_cli == NULL means a new initial connection.
 295 ********************************************************************/
 296
 297 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 298                                         struct cli_state *referring_cli,
 299                                         const char *server,
 300                                         const char *share,
 301                                         const struct user_auth_info *auth_info,
 302                                         bool show_hdr,
 303                                         bool force_encrypt,
 304                                         int max_protocol,
 305                                         int port,
 306                                         int name_type)
 307 {
 308         struct cli_state *cli;
 309
 310         cli = do_connect(ctx, server, share,
 311                                 auth_info,
 312                                 show_hdr, force_encrypt, max_protocol,
 313                                 port, name_type);
 314
 315         if (!cli ) {
 316                 return NULL;
 317         }
 318
 319         /* Enter into the list. */
 320         if (referring_cli) {
 321                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 322         }
 323
 324         if (referring_cli && referring_cli->requested_posix_capabilities) {
 325                 uint16 major, minor;
 326                 uint32 caplow, caphigh;
 327                 NTSTATUS status;
 328                 status = cli_unix_extensions_version(cli, &major, &minor,
 329                                                      &caplow, &caphigh);
 330                 if (NT_STATUS_IS_OK(status)) {
 331                         cli_set_unix_extensions_capabilities(cli,
 332                                         major, minor,
 333                                         caplow, caphigh);
 334                 }
 335         }
 336
 337         return cli;
 338 }
 339
 340 /********************************************************************
 341  Return a connection to a server on a particular share.
 342 ********************************************************************/
 343
 344 static struct cli_state *cli_cm_find(struct cli_state *cli,
 345                                 const char *server,
 346                                 const char *share)
 347 {
 348         struct cli_state *p;
 349
 350         if (cli == NULL) {
 351                 return NULL;
 352         }
 353
 354         /* Search to the start of the list. */
 355         for (p = cli; p; p = DLIST_PREV(p)) {
 356                 if (strequal(server, p->desthost) &&
 357                                 strequal(share,p->share)) {
 358                         return p;
 359                 }
 360         }
 361
 362         /* Search to the end of the list. */
 363         for (p = cli->next; p; p = p->next) {
 364                 if (strequal(server, p->desthost) &&
 365                                 strequal(share,p->share)) {
 366                         return p;
 367                 }
 368         }
 369
 370         return NULL;
 371 }
 372
 373 /****************************************************************************
 374  Open a client connection to a \\server\share.
 375 ****************************************************************************/
 376
 377 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 378                                 struct cli_state *referring_cli,
 379                                 const char *server,
 380                                 const char *share,
 381                                 const struct user_auth_info *auth_info,
 382                                 bool show_hdr,
 383                                 bool force_encrypt,
 384                                 int max_protocol,
 385                                 int port,
 386                                 int name_type)
 387 {
 388         /* Try to reuse an existing connection in this list. */
 389         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 390
 391         if (c) {
 392                 return c;
 393         }
 394
 395         if (auth_info == NULL) {
 396                 /* Can't do a new connection
 397                  * without auth info. */
 398                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 399                         "without auth info\n",
 400                         server, share );
 401                 return NULL;
 402         }
 403
 404         return cli_cm_connect(ctx,
 405                                 referring_cli,
 406                                 server,
 407                                 share,
 408                                 auth_info,
 409                                 show_hdr,
 410                                 force_encrypt,
 411                                 max_protocol,
 412                                 port,
 413                                 name_type);
 414 }
 415
 416 /****************************************************************************
 417 ****************************************************************************/
 418
 419 void cli_cm_display(const struct cli_state *cli)
 420 {
 421         int i;
 422
 423         for (i=0; cli; cli = cli->next,i++ ) {
 424                 d_printf("%d:\tserver=%s, share=%s\n",
 425                         i, cli->desthost, cli->share );
 426         }
 427 }
 428
 429 /****************************************************************************
 430 ****************************************************************************/
 431
 432 /****************************************************************************
 433 ****************************************************************************/
 434
 435 #if 0
 436 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 437 {
 438         SAFE_FREE(cm_creds.username);
 439         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 440                                                auth_info));
 441
 442         if (get_cmdline_auth_info_got_pass(auth_info)) {
 443                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 444         }
 445
 446         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 447         cm_creds.fallback_after_kerberos = false;
 448         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 449 }
 450 #endif
 451
 452 /**********************************************************************
 453  split a dfs path into the server, share name, and extrapath components
 454 **********************************************************************/
 455
 456 static bool split_dfs_path(TALLOC_CTX *ctx,
 457                                 const char *nodepath,
 458                                 char **pp_server,
 459                                 char **pp_share,
 460                                 char **pp_extrapath)
 461 {
 462         char *p, *q;
 463         char *path;
 464
 465         *pp_server = NULL;
 466         *pp_share = NULL;
 467         *pp_extrapath = NULL;
 468
 469         path = talloc_strdup(ctx, nodepath);
 470         if (!path) {
 471                 goto fail;
 472         }
 473
 474         if ( path[0] != '\\' ) {
 475                 goto fail;
 476         }
 477
 478         p = strchr_m( path + 1, '\\' );
 479         if ( !p ) {
 480                 goto fail;
 481         }
 482
 483         *p = '\0';
 484         p++;
 485
 486         /* Look for any extra/deep path */
 487         q = strchr_m(p, '\\');
 488         if (q != NULL) {
 489                 *q = '\0';
 490                 q++;
 491                 *pp_extrapath = talloc_strdup(ctx, q);
 492         } else {
 493                 *pp_extrapath = talloc_strdup(ctx, "");
 494         }
 495         if (*pp_extrapath == NULL) {
 496                 goto fail;
 497         }
 498
 499         *pp_share = talloc_strdup(ctx, p);
 500         if (*pp_share == NULL) {
 501                 goto fail;
 502         }
 503
 504         *pp_server = talloc_strdup(ctx, &path[1]);
 505         if (*pp_server == NULL) {
 506                 goto fail;
 507         }
 508
 509         TALLOC_FREE(path);
 510         return true;
 511
 512 fail:
 513         TALLOC_FREE(*pp_share);
 514         TALLOC_FREE(*pp_extrapath);
 515         TALLOC_FREE(path);
 516         return false;
 517 }
 518
 519 /****************************************************************************
 520  Return the original path truncated at the directory component before
 521  the first wildcard character. Trust the caller to provide a NULL
 522  terminated string
 523 ****************************************************************************/
 524
 525 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 526 {
 527         size_t len;
 528         char *p1, *p2, *p;
 529         char *path_out;
 530
 531         /* No absolute paths. */
 532         while (IS_DIRECTORY_SEP(*path)) {
 533                 path++;
 534         }
 535
 536         path_out = talloc_strdup(ctx, path);
 537         if (!path_out) {
 538                 return NULL;
 539         }
 540
 541         p1 = strchr_m(path_out, '*');
 542         p2 = strchr_m(path_out, '?');
 543
 544         if (p1 || p2) {
 545                 if (p1 && p2) {
 546                         p = MIN(p1,p2);
 547                 } else if (!p1) {
 548                         p = p2;
 549                 } else {
 550                         p = p1;
 551                 }
 552                 *p = '\0';
 553
 554                 /* Now go back to the start of this component. */
 555                 p1 = strrchr_m(path_out, '/');
 556                 p2 = strrchr_m(path_out, '\\');
 557                 p = MAX(p1,p2);
 558                 if (p) {
 559                         *p = '\0';
 560                 }
 561         }
 562
 563         /* Strip any trailing separator */
 564
 565         len = strlen(path_out);
 566         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 567                 path_out[len-1] = '\0';
 568         }
 569
 570         return path_out;
 571 }
 572
 573 /****************************************************************************
 574 ****************************************************************************/
 575
 576 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 577                                         struct cli_state *cli,
 578                                         const char *dir)
 579 {
 580         char path_sep = '\\';
 581
 582         /* Ensure the extrapath doesn't start with a separator. */
 583         while (IS_DIRECTORY_SEP(*dir)) {
 584                 dir++;
 585         }
 586
 587         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 588                 path_sep = '/';
 589         }
 590         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 591                         path_sep,
 592                         cli->desthost,
 593                         path_sep,
 594                         cli->share,
 595                         path_sep,
 596                         dir);
 597 }
 598
 599 /********************************************************************
 600  check for dfs referral
 601 ********************************************************************/
 602
 603 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 604                                 NTSTATUS status)
 605 {
 606         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 607
 608         if (!(cli->capabilities & CAP_UNICODE)) {
 609                 return false;
 610         }
 611         if (!(cli->capabilities & CAP_STATUS32)) {
 612                 return false;
 613         }
 614         if (NT_STATUS_EQUAL(status, expected)) {
 615                 return true;
 616         }
 617         return false;
 618 }
 619
 620 /********************************************************************
 621  Get the dfs referral link.
 622 ********************************************************************/
 623
 624 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 625                         struct cli_state *cli,
 626                         const char *path,
 627                         struct client_dfs_referral **refs,
 628                         size_t *num_refs,
 629                         size_t *consumed)
 630 {
 631         unsigned int data_len = 0;
 632         unsigned int param_len = 0;
 633         uint16 setup[1];
 634         uint8_t *param = NULL;
 635         uint8_t *rdata = NULL;
 636         char *p;
 637         char *endp;
 638         size_t pathlen = 2*(strlen(path)+1);
 639         smb_ucs2_t *path_ucs;
 640         char *consumed_path = NULL;
 641         uint16_t consumed_ucs;
 642         uint16 num_referrals;
 643         struct client_dfs_referral *referrals = NULL;
 644         NTSTATUS status;
 645
 646         *num_refs = 0;
 647         *refs = NULL;
 648
 649         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 650
 651         param = SMB_MALLOC_ARRAY(uint8_t, 2+pathlen+2);
 652         if (!param) {
 653                 status = NT_STATUS_NO_MEMORY;
 654                 goto out;
 655         }
 656         SSVAL(param, 0, 0x03);  /* max referral level */
 657         p = (char *)(&param[2]);
 658
 659         path_ucs = (smb_ucs2_t *)p;
 660         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 661         param_len = PTR_DIFF(p, param);
 662
 663         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 664                            NULL, 0xffff, 0, 0,
 665                            setup, 1, 0,
 666                            param, param_len, 2,
 667                            NULL, 0, cli->max_xmit,
 668                            NULL,
 669                            NULL, 0, NULL, /* rsetup */
 670                            NULL, 0, NULL,
 671                            &rdata, 4, &data_len);
 672         if (!NT_STATUS_IS_OK(status)) {
 673                 goto out;
 674         }
 675         if (data_len < 4) {
 676                 goto out;
 677         }
 678
 679         endp = (char *)rdata + data_len;
 680
 681         consumed_ucs  = SVAL(rdata, 0);
 682         num_referrals = SVAL(rdata, 2);
 683
 684         /* consumed_ucs is the number of bytes
 685          * of the UCS2 path consumed not counting any
 686          * terminating null. We need to convert
 687          * back to unix charset and count again
 688          * to get the number of bytes consumed from
 689          * the incoming path. */
 690
 691         if (pull_string_talloc(talloc_tos(),
 692                         NULL,
 693                         0,
 694                         &consumed_path,
 695                         path_ucs,
 696                         consumed_ucs,
 697                         STR_UNICODE) == 0) {
 698                 goto out;
 699         }
 700         if (consumed_path == NULL) {
 701                 goto out;
 702         }
 703         *consumed = strlen(consumed_path);
 704
 705         if (num_referrals != 0) {
 706                 uint16 ref_version;
 707                 uint16 ref_size;
 708                 int i;
 709                 uint16 node_offset;
 710
 711                 referrals = talloc_array(ctx, struct client_dfs_referral,
 712                                          num_referrals);
 713
 714                 if (!referrals) {
 715                         goto out;
 716                 }
 717                 /* start at the referrals array */
 718
 719                 p = (char *)rdata+8;
 720                 for (i=0; i<num_referrals && p < endp; i++) {
 721                         if (p + 18 > endp) {
 722                                 goto out;
 723                         }
 724                         ref_version = SVAL(p, 0);
 725                         ref_size    = SVAL(p, 2);
 726                         node_offset = SVAL(p, 16);
 727
 728                         if (ref_version != 3) {
 729                                 p += ref_size;
 730                                 continue;
 731                         }
 732
 733                         referrals[i].proximity = SVAL(p, 8);
 734                         referrals[i].ttl       = SVAL(p, 10);
 735
 736                         if (p + node_offset > endp) {
 737                                 goto out;
 738                         }
 739                         clistr_pull_talloc(ctx, cli->inbuf,
 740                                            SVAL(cli->inbuf, smb_flg2),
 741                                            &referrals[i].dfspath,
 742                                            p+node_offset,
 743                                            cli->bufsize - ((p+node_offset)-cli->inbuf),
 744                                            STR_TERMINATE|STR_UNICODE);
 745
 746                         if (!referrals[i].dfspath) {
 747                                 goto out;
 748                         }
 749                         p += ref_size;
 750                 }
 751                 if (i < num_referrals) {
 752                         goto out;
 753                 }
 754         }
 755
 756         *num_refs = num_referrals;
 757         *refs = referrals;
 758
 759   out:
 760
 761         TALLOC_FREE(consumed_path);
 762         SAFE_FREE(param);
 763         TALLOC_FREE(rdata);
 764         return status;
 765 }
 766
 767 /********************************************************************
 768 ********************************************************************/
 769
 770 bool cli_resolve_path(TALLOC_CTX *ctx,
 771                         const char *mountpt,
 772                         const struct user_auth_info *dfs_auth_info,
 773                         struct cli_state *rootcli,
 774                         const char *path,
 775                         struct cli_state **targetcli,
 776                         char **pp_targetpath)
 777 {
 778         struct client_dfs_referral *refs = NULL;
 779         size_t num_refs = 0;
 780         size_t consumed = 0;
 781         struct cli_state *cli_ipc = NULL;
 782         char *dfs_path = NULL;
 783         char *cleanpath = NULL;
 784         char *extrapath = NULL;
 785         int pathlen;
 786         char *server = NULL;
 787         char *share = NULL;
 788         struct cli_state *newcli = NULL;
 789         char *newpath = NULL;
 790         char *newmount = NULL;
 791         char *ppath = NULL;
 792         SMB_STRUCT_STAT sbuf;
 793         uint32 attributes;
 794         NTSTATUS status;
 795
 796         if ( !rootcli || !path || !targetcli ) {
 797                 return false;
 798         }
 799
 800         /* Don't do anything if this is not a DFS root. */
 801
 802         if ( !rootcli->dfsroot) {
 803                 *targetcli = rootcli;
 804                 *pp_targetpath = talloc_strdup(ctx, path);
 805                 if (!*pp_targetpath) {
 806                         return false;
 807                 }
 808                 return true;
 809         }
 810
 811         *targetcli = NULL;
 812
 813         /* Send a trans2_query_path_info to check for a referral. */
 814
 815         cleanpath = clean_path(ctx, path);
 816         if (!cleanpath) {
 817                 return false;
 818         }
 819
 820         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 821         if (!dfs_path) {
 822                 return false;
 823         }
 824
 825         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 826         if (NT_STATUS_IS_OK(status)) {
 827                 /* This is an ordinary path, just return it. */
 828                 *targetcli = rootcli;
 829                 *pp_targetpath = talloc_strdup(ctx, path);
 830                 if (!*pp_targetpath) {
 831                         return false;
 832                 }
 833                 goto done;
 834         }
 835
 836         /* Special case where client asked for a path that does not exist */
 837
 838         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 839                                 status)) {
 840                 *targetcli = rootcli;
 841                 *pp_targetpath = talloc_strdup(ctx, path);
 842                 if (!*pp_targetpath) {
 843                         return false;
 844                 }
 845                 goto done;
 846         }
 847
 848         /* We got an error, check for DFS referral. */
 849
 850         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 851                                  status)) {
 852                 return false;
 853         }
 854
 855         /* Check for the referral. */
 856
 857         if (!(cli_ipc = cli_cm_open(ctx,
 858                                 rootcli,
 859                                 rootcli->desthost,
 860                                 "IPC$",
 861                                 dfs_auth_info,
 862                                 false,
 863                                 (rootcli->trans_enc_state != NULL),
 864                                 rootcli->protocol,
 865                                 0,
 866                                 0x20))) {
 867                 return false;
 868         }
 869
 870         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 871                                       &num_refs, &consumed);
 872         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 873                 return false;
 874         }
 875
 876         /* Just store the first referral for now. */
 877
 878         if (!refs[0].dfspath) {
 879                 return false;
 880         }
 881         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 882                             &extrapath)) {
 883                 return false;
 884         }
 885
 886         /* Make sure to recreate the original string including any wildcards. */
 887
 888         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 889         if (!dfs_path) {
 890                 return false;
 891         }
 892         pathlen = strlen(dfs_path);
 893         consumed = MIN(pathlen, consumed);
 894         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 895         if (!*pp_targetpath) {
 896                 return false;
 897         }
 898         dfs_path[consumed] = '\0';
 899
 900         /*
 901          * *pp_targetpath is now the unconsumed part of the path.
 902          * dfs_path is now the consumed part of the path
 903          * (in \server\share\path format).
 904          */
 905
 906         /* Open the connection to the target server & share */
 907         if ((*targetcli = cli_cm_open(ctx, rootcli,
 908                                         server,
 909                                         share,
 910                                         dfs_auth_info,
 911                                         false,
 912                                         (rootcli->trans_enc_state != NULL),
 913                                         rootcli->protocol,
 914                                         0,
 915                                         0x20)) == NULL) {
 916                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 917                         server, share );
 918                 return false;
 919         }
 920
 921         if (extrapath && strlen(extrapath) > 0) {
 922                 *pp_targetpath = talloc_asprintf(ctx,
 923                                                 "%s%s",
 924                                                 extrapath,
 925                                                 *pp_targetpath);
 926                 if (!*pp_targetpath) {
 927                         return false;
 928                 }
 929         }
 930
 931         /* parse out the consumed mount path */
 932         /* trim off the \server\share\ */
 933
 934         ppath = dfs_path;
 935
 936         if (*ppath != '\\') {
 937                 d_printf("cli_resolve_path: "
 938                         "dfs_path (%s) not in correct format.\n",
 939                         dfs_path );
 940                 return false;
 941         }
 942
 943         ppath++; /* Now pointing at start of server name. */
 944
 945         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 946                 return false;
 947         }
 948
 949         ppath++; /* Now pointing at start of share name. */
 950
 951         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 952                 return false;
 953         }
 954
 955         ppath++; /* Now pointing at path component. */
 956
 957         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 958         if (!newmount) {
 959                 return false;
 960         }
 961
 962         cli_set_mntpoint(*targetcli, newmount);
 963
 964         /* Check for another dfs referral, note that we are not
 965            checking for loops here. */
 966
 967         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 968                 if (cli_resolve_path(ctx,
 969                                         newmount,
 970                                         dfs_auth_info,
 971                                         *targetcli,
 972                                         *pp_targetpath,
 973                                         &newcli,
 974                                         &newpath)) {
 975                         /*
 976                          * When cli_resolve_path returns true here it's always
 977                          * returning the complete path in newpath, so we're done
 978                          * here.
 979                          */
 980                         *targetcli = newcli;
 981                         *pp_targetpath = newpath;
 982                         return true;
 983                 }
 984         }
 985
 986   done:
 987
 988         /* If returning true ensure we return a dfs root full path. */
 989         if ((*targetcli)->dfsroot) {
 990                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 991                 if (!dfs_path) {
 992                         return false;
 993                 }
 994                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 995         }
 996
 997         return true;
 998 }
 999
1000 /********************************************************************
1001 ********************************************************************/
1002
1003 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1004                                 struct cli_state *cli,
1005                                 const char *sharename,
1006                                 char **pp_newserver,
1007                                 char **pp_newshare,
1008                                 bool force_encrypt,
1009                                 const char *username,
1010                                 const char *password,
1011                                 const char *domain)
1012 {
1013         struct client_dfs_referral *refs = NULL;
1014         size_t num_refs = 0;
1015         size_t consumed = 0;
1016         char *fullpath = NULL;
1017         bool res;
1018         uint16 cnum;
1019         char *newextrapath = NULL;
1020         NTSTATUS status;
1021
1022         if (!cli || !sharename) {
1023                 return false;
1024         }
1025
1026         cnum = cli->cnum;
1027
1028         /* special case.  never check for a referral on the IPC$ share */
1029
1030         if (strequal(sharename, "IPC$")) {
1031                 return false;
1032         }
1033
1034         /* send a trans2_query_path_info to check for a referral */
1035
1036         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1037         if (!fullpath) {
1038                 return false;
1039         }
1040
1041         /* check for the referral */
1042
1043         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1044                 return false;
1045         }
1046
1047         if (force_encrypt) {
1048                 status = cli_cm_force_encryption(cli,
1049                                         username,
1050                                         password,
1051                                         lp_workgroup(),
1052                                         "IPC$");
1053                 if (!NT_STATUS_IS_OK(status)) {
1054                         return false;
1055                 }
1056         }
1057
1058         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1059                                       &num_refs, &consumed);
1060         res = NT_STATUS_IS_OK(status);
1061
1062         status = cli_tdis(cli);
1063         if (!NT_STATUS_IS_OK(status)) {
1064                 return false;
1065         }
1066
1067         cli->cnum = cnum;
1068
1069         if (!res || !num_refs) {
1070                 return false;
1071         }
1072
1073         if (!refs[0].dfspath) {
1074                 return false;
1075         }
1076
1077         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1078                             pp_newshare, &newextrapath)) {
1079                 return false;
1080         }
1081
1082         /* check that this is not a self-referral */
1083
1084         if (strequal(cli->desthost, *pp_newserver) &&
1085                         strequal(sharename, *pp_newshare)) {
1086                 return false;
1087         }
1088
1089         return true;
1090 }