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
  24 /********************************************************************
  25  Important point.
  26
  27  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  28  are not C escaped here).
  29
  30  - but if we're using POSIX paths then <pathname> may contain
  31    '/' separators, not '\\' separators. So cope with '\\' or '/'
  32    as a separator when looking at the pathname part.... JRA.
  33 ********************************************************************/
  34
  35 /********************************************************************
  36  Ensure a connection is encrypted.
  37 ********************************************************************/
  38
  39 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  40                         const char *username,
  41                         const char *password,
  42                         const char *domain,
  43                         const char *sharename)
  44 {
  45         NTSTATUS status = cli_force_encryption(c,
  46                                         username,
  47                                         password,
  48                                         domain);
  49
  50         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  51                 d_printf("Encryption required and "
  52                         "server that doesn't support "
  53                         "UNIX extensions - failing connect\n");
  54         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  55                 d_printf("Encryption required and "
  56                         "can't get UNIX CIFS extensions "
  57                         "version from server.\n");
  58         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  59                 d_printf("Encryption required and "
  60                         "share %s doesn't support "
  61                         "encryption.\n", sharename);
  62         } else if (!NT_STATUS_IS_OK(status)) {
  63                 d_printf("Encryption required and "
  64                         "setup failed with error %s.\n",
  65                         nt_errstr(status));
  66         }
  67
  68         return status;
  69 }
  70
  71 /********************************************************************
  72  Return a connection to a server.
  73 ********************************************************************/
  74
  75 static struct cli_state *do_connect(TALLOC_CTX *ctx,
  76                                         const char *server,
  77                                         const char *share,
  78                                         const struct user_auth_info *auth_info,
  79                                         bool show_sessetup,
  80                                         bool force_encrypt,
  81                                         int max_protocol,
  82                                         int port,
  83                                         int name_type)
  84 {
  85         struct cli_state *c = NULL;
  86         struct nmb_name called, calling;
  87         const char *called_str;
  88         const char *server_n;
  89         struct sockaddr_storage ss;
  90         char *servicename;
  91         char *sharename;
  92         char *newserver, *newshare;
  93         const char *username;
  94         const char *password;
  95         NTSTATUS status;
  96
  97         /* make a copy so we don't modify the global string 'service' */
  98         servicename = talloc_strdup(ctx,share);
  99         if (!servicename) {
 100                 return NULL;
 101         }
 102         sharename = servicename;
 103         if (*sharename == '\\') {
 104                 sharename += 2;
 105                 called_str = sharename;
 106                 if (server == NULL) {
 107                         server = sharename;
 108                 }
 109                 sharename = strchr_m(sharename,'\\');
 110                 if (!sharename) {
 111                         return NULL;
 112                 }
 113                 *sharename = 0;
 114                 sharename++;
 115         } else {
 116                 called_str = server;
 117         }
 118
 119         server_n = server;
 120
 121         zero_sockaddr(&ss);
 122
 123         make_nmb_name(&calling, global_myname(), 0x0);
 124         make_nmb_name(&called , called_str, name_type);
 125
 126  again:
 127         zero_sockaddr(&ss);
 128
 129         /* have to open a new connection */
 130         c = cli_initialise_ex(get_cmdline_auth_info_signing_state(auth_info));
 131         if (c == NULL) {
 132                 d_printf("Connection to %s failed\n", server_n);
 133                 if (c) {
 134                         cli_shutdown(c);
 135                 }
 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 void 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                 return;
 472         }
 473
 474         if ( path[0] != '\\' ) {
 475                 return;
 476         }
 477
 478         p = strchr_m( path + 1, '\\' );
 479         if ( !p ) {
 480                 return;
 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
 496         *pp_share = talloc_strdup(ctx, p);
 497         *pp_server = talloc_strdup(ctx, &path[1]);
 498 }
 499
 500 /****************************************************************************
 501  Return the original path truncated at the directory component before
 502  the first wildcard character. Trust the caller to provide a NULL
 503  terminated string
 504 ****************************************************************************/
 505
 506 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 507 {
 508         size_t len;
 509         char *p1, *p2, *p;
 510         char *path_out;
 511
 512         /* No absolute paths. */
 513         while (IS_DIRECTORY_SEP(*path)) {
 514                 path++;
 515         }
 516
 517         path_out = talloc_strdup(ctx, path);
 518         if (!path_out) {
 519                 return NULL;
 520         }
 521
 522         p1 = strchr_m(path_out, '*');
 523         p2 = strchr_m(path_out, '?');
 524
 525         if (p1 || p2) {
 526                 if (p1 && p2) {
 527                         p = MIN(p1,p2);
 528                 } else if (!p1) {
 529                         p = p2;
 530                 } else {
 531                         p = p1;
 532                 }
 533                 *p = '\0';
 534
 535                 /* Now go back to the start of this component. */
 536                 p1 = strrchr_m(path_out, '/');
 537                 p2 = strrchr_m(path_out, '\\');
 538                 p = MAX(p1,p2);
 539                 if (p) {
 540                         *p = '\0';
 541                 }
 542         }
 543
 544         /* Strip any trailing separator */
 545
 546         len = strlen(path_out);
 547         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 548                 path_out[len-1] = '\0';
 549         }
 550
 551         return path_out;
 552 }
 553
 554 /****************************************************************************
 555 ****************************************************************************/
 556
 557 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 558                                         struct cli_state *cli,
 559                                         const char *dir)
 560 {
 561         char path_sep = '\\';
 562
 563         /* Ensure the extrapath doesn't start with a separator. */
 564         while (IS_DIRECTORY_SEP(*dir)) {
 565                 dir++;
 566         }
 567
 568         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 569                 path_sep = '/';
 570         }
 571         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 572                         path_sep,
 573                         cli->desthost,
 574                         path_sep,
 575                         cli->share,
 576                         path_sep,
 577                         dir);
 578 }
 579
 580 /********************************************************************
 581  check for dfs referral
 582 ********************************************************************/
 583
 584 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 585 {
 586         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 587
 588         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 589
 590         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 591                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 592                 return false;
 593
 594         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 595                 return true;
 596
 597         return false;
 598 }
 599
 600 /********************************************************************
 601  Get the dfs referral link.
 602 ********************************************************************/
 603
 604 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 605                         struct cli_state *cli,
 606                         const char *path,
 607                         struct client_dfs_referral **refs,
 608                         size_t *num_refs,
 609                         size_t *consumed)
 610 {
 611         unsigned int data_len = 0;
 612         unsigned int param_len = 0;
 613         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 614         char *param = NULL;
 615         char *rparam=NULL, *rdata=NULL;
 616         char *p;
 617         char *endp;
 618         size_t pathlen = 2*(strlen(path)+1);
 619         smb_ucs2_t *path_ucs;
 620         char *consumed_path = NULL;
 621         uint16_t consumed_ucs;
 622         uint16 num_referrals;
 623         struct client_dfs_referral *referrals = NULL;
 624         bool ret = false;
 625
 626         *num_refs = 0;
 627         *refs = NULL;
 628
 629         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 630         if (!param) {
 631                 goto out;
 632         }
 633         SSVAL(param, 0, 0x03);  /* max referral level */
 634         p = &param[2];
 635
 636         path_ucs = (smb_ucs2_t *)p;
 637         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 638         param_len = PTR_DIFF(p, param);
 639
 640         if (!cli_send_trans(cli, SMBtrans2,
 641                         NULL,                        /* name */
 642                         -1, 0,                          /* fid, flags */
 643                         &setup, 1, 0,                   /* setup, length, max */
 644                         param, param_len, 2,            /* param, length, max */
 645                         NULL, 0, cli->max_xmit /* data, length, max */
 646                         )) {
 647                 goto out;
 648         }
 649
 650         if (!cli_receive_trans(cli, SMBtrans2,
 651                 &rparam, &param_len,
 652                 &rdata, &data_len)) {
 653                 goto out;
 654         }
 655
 656         if (data_len < 4) {
 657                 goto out;
 658         }
 659
 660         endp = 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         if (pull_string_talloc(talloc_tos(),
 673                         NULL,
 674                         0,
 675                         &consumed_path,
 676                         path_ucs,
 677                         consumed_ucs,
 678                         STR_UNICODE) == 0) {
 679                 goto out;
 680         }
 681         if (consumed_path == NULL) {
 682                 goto out;
 683         }
 684         *consumed = strlen(consumed_path);
 685
 686         if (num_referrals != 0) {
 687                 uint16 ref_version;
 688                 uint16 ref_size;
 689                 int i;
 690                 uint16 node_offset;
 691
 692                 referrals = talloc_array(ctx, struct client_dfs_referral,
 693                                          num_referrals);
 694
 695                 if (!referrals) {
 696                         goto out;
 697                 }
 698                 /* start at the referrals array */
 699
 700                 p = rdata+8;
 701                 for (i=0; i<num_referrals && p < endp; i++) {
 702                         if (p + 18 > endp) {
 703                                 goto out;
 704                         }
 705                         ref_version = SVAL(p, 0);
 706                         ref_size    = SVAL(p, 2);
 707                         node_offset = SVAL(p, 16);
 708
 709                         if (ref_version != 3) {
 710                                 p += ref_size;
 711                                 continue;
 712                         }
 713
 714                         referrals[i].proximity = SVAL(p, 8);
 715                         referrals[i].ttl       = SVAL(p, 10);
 716
 717                         if (p + node_offset > endp) {
 718                                 goto out;
 719                         }
 720                         clistr_pull_talloc(ctx, cli->inbuf,
 721                                            SVAL(cli->inbuf, smb_flg2),
 722                                            &referrals[i].dfspath,
 723                                            p+node_offset, -1,
 724                                            STR_TERMINATE|STR_UNICODE);
 725
 726                         if (!referrals[i].dfspath) {
 727                                 goto out;
 728                         }
 729                         p += ref_size;
 730                 }
 731                 if (i < num_referrals) {
 732                         goto out;
 733                 }
 734         }
 735
 736         ret = true;
 737
 738         *num_refs = num_referrals;
 739         *refs = referrals;
 740
 741   out:
 742
 743         TALLOC_FREE(consumed_path);
 744         SAFE_FREE(param);
 745         SAFE_FREE(rdata);
 746         SAFE_FREE(rparam);
 747         return ret;
 748 }
 749
 750 /********************************************************************
 751 ********************************************************************/
 752
 753 bool cli_resolve_path(TALLOC_CTX *ctx,
 754                         const char *mountpt,
 755                         const struct user_auth_info *dfs_auth_info,
 756                         struct cli_state *rootcli,
 757                         const char *path,
 758                         struct cli_state **targetcli,
 759                         char **pp_targetpath)
 760 {
 761         struct client_dfs_referral *refs = NULL;
 762         size_t num_refs = 0;
 763         size_t consumed = 0;
 764         struct cli_state *cli_ipc = NULL;
 765         char *dfs_path = NULL;
 766         char *cleanpath = NULL;
 767         char *extrapath = NULL;
 768         int pathlen;
 769         char *server = NULL;
 770         char *share = NULL;
 771         struct cli_state *newcli = NULL;
 772         char *newpath = NULL;
 773         char *newmount = NULL;
 774         char *ppath = NULL;
 775         SMB_STRUCT_STAT sbuf;
 776         uint32 attributes;
 777         NTSTATUS status;
 778
 779         if ( !rootcli || !path || !targetcli ) {
 780                 return false;
 781         }
 782
 783         /* Don't do anything if this is not a DFS root. */
 784
 785         if ( !rootcli->dfsroot) {
 786                 *targetcli = rootcli;
 787                 *pp_targetpath = talloc_strdup(ctx, path);
 788                 if (!*pp_targetpath) {
 789                         return false;
 790                 }
 791                 return true;
 792         }
 793
 794         *targetcli = NULL;
 795
 796         /* Send a trans2_query_path_info to check for a referral. */
 797
 798         cleanpath = clean_path(ctx, path);
 799         if (!cleanpath) {
 800                 return false;
 801         }
 802
 803         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 804         if (!dfs_path) {
 805                 return false;
 806         }
 807
 808         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 809         if (NT_STATUS_IS_OK(status)) {
 810                 /* This is an ordinary path, just return it. */
 811                 *targetcli = rootcli;
 812                 *pp_targetpath = talloc_strdup(ctx, path);
 813                 if (!*pp_targetpath) {
 814                         return false;
 815                 }
 816                 goto done;
 817         }
 818
 819         /* Special case where client asked for a path that does not exist */
 820
 821         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 822                 *targetcli = rootcli;
 823                 *pp_targetpath = talloc_strdup(ctx, path);
 824                 if (!*pp_targetpath) {
 825                         return false;
 826                 }
 827                 goto done;
 828         }
 829
 830         /* We got an error, check for DFS referral. */
 831
 832         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 833                 return false;
 834         }
 835
 836         /* Check for the referral. */
 837
 838         if (!(cli_ipc = cli_cm_open(ctx,
 839                                 rootcli,
 840                                 rootcli->desthost,
 841                                 "IPC$",
 842                                 dfs_auth_info,
 843                                 false,
 844                                 (rootcli->trans_enc_state != NULL),
 845                                 rootcli->protocol,
 846                                 0,
 847                                 0x20))) {
 848                 return false;
 849         }
 850
 851         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 852                         &num_refs, &consumed) || !num_refs) {
 853                 return false;
 854         }
 855
 856         /* Just store the first referral for now. */
 857
 858         if (!refs[0].dfspath) {
 859                 return false;
 860         }
 861         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 862
 863         if (!server || !share) {
 864                 return false;
 865         }
 866
 867         /* Make sure to recreate the original string including any wildcards. */
 868
 869         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 870         if (!dfs_path) {
 871                 return false;
 872         }
 873         pathlen = strlen(dfs_path);
 874         consumed = MIN(pathlen, consumed);
 875         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 876         if (!*pp_targetpath) {
 877                 return false;
 878         }
 879         dfs_path[consumed] = '\0';
 880
 881         /*
 882          * *pp_targetpath is now the unconsumed part of the path.
 883          * dfs_path is now the consumed part of the path
 884          * (in \server\share\path format).
 885          */
 886
 887         /* Open the connection to the target server & share */
 888         if ((*targetcli = cli_cm_open(ctx, rootcli,
 889                                         server,
 890                                         share,
 891                                         dfs_auth_info,
 892                                         false,
 893                                         (rootcli->trans_enc_state != NULL),
 894                                         rootcli->protocol,
 895                                         0,
 896                                         0x20)) == NULL) {
 897                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 898                         server, share );
 899                 return false;
 900         }
 901
 902         if (extrapath && strlen(extrapath) > 0) {
 903                 *pp_targetpath = talloc_asprintf(ctx,
 904                                                 "%s%s",
 905                                                 extrapath,
 906                                                 *pp_targetpath);
 907                 if (!*pp_targetpath) {
 908                         return false;
 909                 }
 910         }
 911
 912         /* parse out the consumed mount path */
 913         /* trim off the \server\share\ */
 914
 915         ppath = dfs_path;
 916
 917         if (*ppath != '\\') {
 918                 d_printf("cli_resolve_path: "
 919                         "dfs_path (%s) not in correct format.\n",
 920                         dfs_path );
 921                 return false;
 922         }
 923
 924         ppath++; /* Now pointing at start of server name. */
 925
 926         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 927                 return false;
 928         }
 929
 930         ppath++; /* Now pointing at start of share name. */
 931
 932         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 933                 return false;
 934         }
 935
 936         ppath++; /* Now pointing at path component. */
 937
 938         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 939         if (!newmount) {
 940                 return false;
 941         }
 942
 943         cli_set_mntpoint(*targetcli, newmount);
 944
 945         /* Check for another dfs referral, note that we are not
 946            checking for loops here. */
 947
 948         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 949                 if (cli_resolve_path(ctx,
 950                                         newmount,
 951                                         dfs_auth_info,
 952                                         *targetcli,
 953                                         *pp_targetpath,
 954                                         &newcli,
 955                                         &newpath)) {
 956                         /*
 957                          * When cli_resolve_path returns true here it's always
 958                          * returning the complete path in newpath, so we're done
 959                          * here.
 960                          */
 961                         *targetcli = newcli;
 962                         *pp_targetpath = newpath;
 963                         return true;
 964                 }
 965         }
 966
 967   done:
 968
 969         /* If returning true ensure we return a dfs root full path. */
 970         if ((*targetcli)->dfsroot) {
 971                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 972                 if (!dfs_path) {
 973                         return false;
 974                 }
 975                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 976         }
 977
 978         return true;
 979 }
 980
 981 /********************************************************************
 982 ********************************************************************/
 983
 984 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 985                                 struct cli_state *cli,
 986                                 const char *sharename,
 987                                 char **pp_newserver,
 988                                 char **pp_newshare,
 989                                 bool force_encrypt,
 990                                 const char *username,
 991                                 const char *password,
 992                                 const char *domain)
 993 {
 994         struct client_dfs_referral *refs = NULL;
 995         size_t num_refs = 0;
 996         size_t consumed = 0;
 997         char *fullpath = NULL;
 998         bool res;
 999         uint16 cnum;
1000         char *newextrapath = NULL;
1001         NTSTATUS status;
1002
1003         if (!cli || !sharename) {
1004                 return false;
1005         }
1006
1007         cnum = cli->cnum;
1008
1009         /* special case.  never check for a referral on the IPC$ share */
1010
1011         if (strequal(sharename, "IPC$")) {
1012                 return false;
1013         }
1014
1015         /* send a trans2_query_path_info to check for a referral */
1016
1017         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1018         if (!fullpath) {
1019                 return false;
1020         }
1021
1022         /* check for the referral */
1023
1024         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1025                 return false;
1026         }
1027
1028         if (force_encrypt) {
1029                 status = cli_cm_force_encryption(cli,
1030                                         username,
1031                                         password,
1032                                         lp_workgroup(),
1033                                         "IPC$");
1034                 if (!NT_STATUS_IS_OK(status)) {
1035                         return false;
1036                 }
1037         }
1038
1039         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1040
1041         status = cli_tdis(cli);
1042         if (!NT_STATUS_IS_OK(status)) {
1043                 return false;
1044         }
1045
1046         cli->cnum = cnum;
1047
1048         if (!res || !num_refs) {
1049                 return false;
1050         }
1051
1052         if (!refs[0].dfspath) {
1053                 return false;
1054         }
1055
1056         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1057                         pp_newshare, &newextrapath );
1058
1059         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1060                 return false;
1061         }
1062
1063         /* check that this is not a self-referral */
1064
1065         if (strequal(cli->desthost, *pp_newserver) &&
1066                         strequal(sharename, *pp_newshare)) {
1067                 return false;
1068         }
1069
1070         return true;
1071 }