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
   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 struct client_connection {
  36         struct client_connection *prev, *next;
  37         struct cli_state *cli;
  38         char *mount;
  39 };
  40
  41 /* global state....globals reek! */
  42 int max_protocol = PROTOCOL_NT1;
  43
  44 static struct cm_cred_struct {
  45         char *username;
  46         char *password;
  47         bool got_pass;
  48         bool use_kerberos;
  49         int signing_state;
  50 } cm_creds;
  51
  52 static void cm_set_password(const char *newpass);
  53
  54 static int port;
  55 static int name_type = 0x20;
  56 static bool have_ip;
  57 static struct sockaddr_storage dest_ss;
  58
  59 static struct client_connection *connections;
  60
  61 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
  62                                 struct cli_state *cli,
  63                                 const char *sharename,
  64                                 char **pp_newserver,
  65                                 char **pp_newshare,
  66                                 bool force_encrypt,
  67                                 const char *username,
  68                                 const char *password,
  69                                 const char *domain);
  70
  71 /********************************************************************
  72  Ensure a connection is encrypted.
  73 ********************************************************************/
  74
  75 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  76                         const char *username,
  77                         const char *password,
  78                         const char *domain,
  79                         const char *sharename)
  80 {
  81         NTSTATUS status = cli_force_encryption(c,
  82                                         username,
  83                                         password,
  84                                         domain);
  85
  86         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  87                 d_printf("Encryption required and "
  88                         "server that doesn't support "
  89                         "UNIX extensions - failing connect\n");
  90         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  91                 d_printf("Encryption required and "
  92                         "can't get UNIX CIFS extensions "
  93                         "version from server.\n");
  94         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  95                 d_printf("Encryption required and "
  96                         "share %s doesn't support "
  97                         "encryption.\n", sharename);
  98         } else if (!NT_STATUS_IS_OK(status)) {
  99                 d_printf("Encryption required and "
 100                         "setup failed with error %s.\n",
 101                         nt_errstr(status));
 102         }
 103
 104         return status;
 105 }
 106
 107 /********************************************************************
 108  Return a connection to a server.
 109 ********************************************************************/
 110
 111 static struct cli_state *do_connect(TALLOC_CTX *ctx,
 112                                         const char *server,
 113                                         const char *share,
 114                                         bool show_sessetup,
 115                                         bool force_encrypt)
 116 {
 117         struct cli_state *c = NULL;
 118         struct nmb_name called, calling;
 119         const char *server_n;
 120         struct sockaddr_storage ss;
 121         char *servicename;
 122         char *sharename;
 123         char *newserver, *newshare;
 124         const char *username;
 125         const char *password;
 126         NTSTATUS status;
 127
 128         /* make a copy so we don't modify the global string 'service' */
 129         servicename = talloc_strdup(ctx,share);
 130         if (!servicename) {
 131                 return NULL;
 132         }
 133         sharename = servicename;
 134         if (*sharename == '\\') {
 135                 server = sharename+2;
 136                 sharename = strchr_m(server,'\\');
 137                 if (!sharename) {
 138                         return NULL;
 139                 }
 140                 *sharename = 0;
 141                 sharename++;
 142         }
 143
 144         server_n = server;
 145
 146         zero_addr(&ss);
 147
 148         make_nmb_name(&calling, global_myname(), 0x0);
 149         make_nmb_name(&called , server, name_type);
 150
 151  again:
 152         zero_addr(&ss);
 153         if (have_ip)
 154                 ss = dest_ss;
 155
 156         /* have to open a new connection */
 157         if (!(c=cli_initialise()) || (cli_set_port(c, port) != port)) {
 158                 d_printf("Connection to %s failed\n", server_n);
 159                 return NULL;
 160         }
 161         status = cli_connect(c, server_n, &ss);
 162         if (!NT_STATUS_IS_OK(status)) {
 163                 d_printf("Connection to %s failed (Error %s)\n",
 164                                 server_n,
 165                                 nt_errstr(status));
 166                 return NULL;
 167         }
 168
 169         c->protocol = max_protocol;
 170         c->use_kerberos = cm_creds.use_kerberos;
 171         cli_setup_signing_state(c, cm_creds.signing_state);
 172
 173         if (!cli_session_request(c, &calling, &called)) {
 174                 char *p;
 175                 d_printf("session request to %s failed (%s)\n",
 176                          called.name, cli_errstr(c));
 177                 cli_shutdown(c);
 178                 c = NULL;
 179                 if ((p=strchr_m(called.name, '.'))) {
 180                         *p = 0;
 181                         goto again;
 182                 }
 183                 if (strcmp(called.name, "*SMBSERVER")) {
 184                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 185                         goto again;
 186                 }
 187                 return NULL;
 188         }
 189
 190         DEBUG(4,(" session request ok\n"));
 191
 192         if (!cli_negprot(c)) {
 193                 d_printf("protocol negotiation failed\n");
 194                 cli_shutdown(c);
 195                 return NULL;
 196         }
 197
 198         if (!cm_creds.got_pass) {
 199                 char *pass = getpass("Password: ");
 200                 if (pass) {
 201                         cm_set_password(pass);
 202                 }
 203         }
 204
 205         username = cm_creds.username ? cm_creds.username : "";
 206         password = cm_creds.password ? cm_creds.password : "";
 207
 208         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 209                                                password, strlen(password),
 210                                                password, strlen(password),
 211                                                lp_workgroup()))) {
 212                 /* If a password was not supplied then
 213                  * try again with a null username. */
 214                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 215                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 216                                                 "", 0,
 217                                                 "", 0,
 218                                                lp_workgroup()))) {
 219                         d_printf("session setup failed: %s\n", cli_errstr(c));
 220                         if (NT_STATUS_V(cli_nt_error(c)) ==
 221                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 222                                 d_printf("did you forget to run kinit?\n");
 223                         cli_shutdown(c);
 224                         return NULL;
 225                 }
 226                 d_printf("Anonymous login successful\n");
 227         }
 228
 229         if ( show_sessetup ) {
 230                 if (*c->server_domain) {
 231                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 232                                 c->server_domain,c->server_os,c->server_type));
 233                 } else if (*c->server_os || *c->server_type) {
 234                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 235                                  c->server_os,c->server_type));
 236                 }
 237         }
 238         DEBUG(4,(" session setup ok\n"));
 239
 240         /* here's the fun part....to support 'msdfs proxy' shares
 241            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 242            here before trying to connect to the original share.
 243            check_dfs_proxy() will fail if it is a normal share. */
 244
 245         if ((c->capabilities & CAP_DFS) &&
 246                         cli_check_msdfs_proxy(ctx, c, sharename,
 247                                 &newserver, &newshare,
 248                                 force_encrypt,
 249                                 username,
 250                                 password,
 251                                 lp_workgroup())) {
 252                 cli_shutdown(c);
 253                 return do_connect(ctx, newserver,
 254                                 newshare, false, force_encrypt);
 255         }
 256
 257         /* must be a normal share */
 258
 259         if (!cli_send_tconX(c, sharename, "?????",
 260                                 password, strlen(password)+1)) {
 261                 d_printf("tree connect failed: %s\n", cli_errstr(c));
 262                 cli_shutdown(c);
 263                 return NULL;
 264         }
 265
 266         if (force_encrypt) {
 267                 status = cli_cm_force_encryption(c,
 268                                         username,
 269                                         password,
 270                                         lp_workgroup(),
 271                                         sharename);
 272                 if (!NT_STATUS_IS_OK(status)) {
 273                         cli_shutdown(c);
 274                         return NULL;
 275                 }
 276         }
 277
 278         DEBUG(4,(" tconx ok\n"));
 279         return c;
 280 }
 281
 282 /****************************************************************************
 283 ****************************************************************************/
 284
 285 static void cli_cm_set_mntpoint(struct cli_state *c, const char *mnt)
 286 {
 287         struct client_connection *p;
 288         int i;
 289
 290         for (p=connections,i=0; p; p=p->next,i++) {
 291                 if (strequal(p->cli->desthost, c->desthost) &&
 292                                 strequal(p->cli->share, c->share)) {
 293                         break;
 294                 }
 295         }
 296
 297         if (p) {
 298                 char *name = clean_name(NULL, p->mount);
 299                 if (!name) {
 300                         return;
 301                 }
 302                 p->mount = talloc_strdup(p, name);
 303                 TALLOC_FREE(name);
 304         }
 305 }
 306
 307 /****************************************************************************
 308 ****************************************************************************/
 309
 310 const char *cli_cm_get_mntpoint(struct cli_state *c)
 311 {
 312         struct client_connection *p;
 313         int i;
 314
 315         for (p=connections,i=0; p; p=p->next,i++) {
 316                 if (strequal(p->cli->desthost, c->desthost) &&
 317                                 strequal(p->cli->share, c->share)) {
 318                         break;
 319                 }
 320         }
 321
 322         if (p) {
 323                 return p->mount;
 324         }
 325         return NULL;
 326 }
 327
 328 /********************************************************************
 329  Add a new connection to the list
 330 ********************************************************************/
 331
 332 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 333                                         struct cli_state *referring_cli,
 334                                         const char *server,
 335                                         const char *share,
 336                                         bool show_hdr,
 337                                         bool force_encrypt)
 338 {
 339         struct client_connection *node;
 340
 341         /* NB This must be the null context here... JRA. */
 342         node = TALLOC_ZERO_ARRAY(NULL, struct client_connection, 1);
 343         if (!node) {
 344                 return NULL;
 345         }
 346
 347         node->cli = do_connect(ctx, server, share, show_hdr, force_encrypt);
 348
 349         if ( !node->cli ) {
 350                 TALLOC_FREE( node );
 351                 return NULL;
 352         }
 353
 354         DLIST_ADD( connections, node );
 355
 356         cli_cm_set_mntpoint(node->cli, "");
 357
 358         if (referring_cli && referring_cli->posix_capabilities) {
 359                 uint16 major, minor;
 360                 uint32 caplow, caphigh;
 361                 if (cli_unix_extensions_version(node->cli, &major,
 362                                         &minor, &caplow, &caphigh)) {
 363                         cli_set_unix_extensions_capabilities(node->cli,
 364                                         major, minor,
 365                                         caplow, caphigh);
 366                 }
 367         }
 368
 369         return node->cli;
 370 }
 371
 372 /********************************************************************
 373  Return a connection to a server.
 374 ********************************************************************/
 375
 376 static struct cli_state *cli_cm_find(const char *server, const char *share)
 377 {
 378         struct client_connection *p;
 379
 380         for (p=connections; p; p=p->next) {
 381                 if ( strequal(server, p->cli->desthost) &&
 382                                 strequal(share,p->cli->share)) {
 383                         return p->cli;
 384                 }
 385         }
 386
 387         return NULL;
 388 }
 389
 390 /****************************************************************************
 391  Open a client connection to a \\server\share.  Set's the current *cli
 392  global variable as a side-effect (but only if the connection is successful).
 393 ****************************************************************************/
 394
 395 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 396                                 struct cli_state *referring_cli,
 397                                 const char *server,
 398                                 const char *share,
 399                                 bool show_hdr,
 400                                 bool force_encrypt)
 401 {
 402         struct cli_state *c;
 403
 404         /* try to reuse an existing connection */
 405
 406         c = cli_cm_find(server, share);
 407         if (!c) {
 408                 c = cli_cm_connect(ctx, referring_cli,
 409                                 server, share, show_hdr, force_encrypt);
 410         }
 411
 412         return c;
 413 }
 414
 415 /****************************************************************************
 416 ****************************************************************************/
 417
 418 void cli_cm_shutdown(void)
 419 {
 420         struct client_connection *p, *x;
 421
 422         for (p=connections; p;) {
 423                 cli_shutdown(p->cli);
 424                 x = p;
 425                 p = p->next;
 426
 427                 TALLOC_FREE(x);
 428         }
 429
 430         connections = NULL;
 431         return;
 432 }
 433
 434 /****************************************************************************
 435 ****************************************************************************/
 436
 437 void cli_cm_display(void)
 438 {
 439         struct client_connection *p;
 440         int i;
 441
 442         for ( p=connections,i=0; p; p=p->next,i++ ) {
 443                 d_printf("%d:\tserver=%s, share=%s\n",
 444                         i, p->cli->desthost, p->cli->share );
 445         }
 446 }
 447
 448 /****************************************************************************
 449 ****************************************************************************/
 450
 451 static void cm_set_password(const char *newpass)
 452 {
 453         SAFE_FREE(cm_creds.password);
 454         cm_creds.password = SMB_STRDUP(newpass);
 455         if (cm_creds.password) {
 456                 cm_creds.got_pass = true;
 457         }
 458 }
 459
 460 void cli_cm_set_credentials(void)
 461 {
 462         SAFE_FREE(cm_creds.username);
 463         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username());
 464
 465         if (get_cmdline_auth_info_got_pass()) {
 466                 cm_set_password(get_cmdline_auth_info_password());
 467         }
 468
 469         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos();
 470         cm_creds.signing_state = get_cmdline_auth_info_signing_state();
 471 }
 472
 473 /****************************************************************************
 474 ****************************************************************************/
 475
 476 void cli_cm_set_port(int port_number)
 477 {
 478         port = port_number;
 479 }
 480
 481 /****************************************************************************
 482 ****************************************************************************/
 483
 484 void cli_cm_set_dest_name_type(int type)
 485 {
 486         name_type = type;
 487 }
 488
 489 /****************************************************************************
 490 ****************************************************************************/
 491
 492 void cli_cm_set_dest_ss(struct sockaddr_storage *pss)
 493 {
 494         dest_ss = *pss;
 495         have_ip = true;
 496 }
 497
 498 /**********************************************************************
 499  split a dfs path into the server, share name, and extrapath components
 500 **********************************************************************/
 501
 502 static void split_dfs_path(TALLOC_CTX *ctx,
 503                                 const char *nodepath,
 504                                 char **pp_server,
 505                                 char **pp_share,
 506                                 char **pp_extrapath)
 507 {
 508         char *p, *q;
 509         char *path;
 510
 511         *pp_server = NULL;
 512         *pp_share = NULL;
 513         *pp_extrapath = NULL;
 514
 515         path = talloc_strdup(ctx, nodepath);
 516         if (!path) {
 517                 return;
 518         }
 519
 520         if ( path[0] != '\\' ) {
 521                 return;
 522         }
 523
 524         p = strchr_m( path + 1, '\\' );
 525         if ( !p ) {
 526                 return;
 527         }
 528
 529         *p = '\0';
 530         p++;
 531
 532         /* Look for any extra/deep path */
 533         q = strchr_m(p, '\\');
 534         if (q != NULL) {
 535                 *q = '\0';
 536                 q++;
 537                 *pp_extrapath = talloc_strdup(ctx, q);
 538         } else {
 539                 *pp_extrapath = talloc_strdup(ctx, "");
 540         }
 541
 542         *pp_share = talloc_strdup(ctx, p);
 543         *pp_server = talloc_strdup(ctx, &path[1]);
 544 }
 545
 546 /****************************************************************************
 547  Return the original path truncated at the directory component before
 548  the first wildcard character. Trust the caller to provide a NULL
 549  terminated string
 550 ****************************************************************************/
 551
 552 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 553 {
 554         size_t len;
 555         char *p1, *p2, *p;
 556         char *path_out;
 557
 558         /* No absolute paths. */
 559         while (IS_DIRECTORY_SEP(*path)) {
 560                 path++;
 561         }
 562
 563         path_out = talloc_strdup(ctx, path);
 564         if (!path_out) {
 565                 return NULL;
 566         }
 567
 568         p1 = strchr_m(path_out, '*');
 569         p2 = strchr_m(path_out, '?');
 570
 571         if (p1 || p2) {
 572                 if (p1 && p2) {
 573                         p = MIN(p1,p2);
 574                 } else if (!p1) {
 575                         p = p2;
 576                 } else {
 577                         p = p1;
 578                 }
 579                 *p = '\0';
 580
 581                 /* Now go back to the start of this component. */
 582                 p1 = strrchr_m(path_out, '/');
 583                 p2 = strrchr_m(path_out, '\\');
 584                 p = MAX(p1,p2);
 585                 if (p) {
 586                         *p = '\0';
 587                 }
 588         }
 589
 590         /* Strip any trailing separator */
 591
 592         len = strlen(path_out);
 593         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 594                 path_out[len-1] = '\0';
 595         }
 596
 597         return path_out;
 598 }
 599
 600 /****************************************************************************
 601 ****************************************************************************/
 602
 603 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 604                                         struct cli_state *cli,
 605                                         const char *dir)
 606 {
 607         /* Ensure the extrapath doesn't start with a separator. */
 608         while (IS_DIRECTORY_SEP(*dir)) {
 609                 dir++;
 610         }
 611
 612         return talloc_asprintf(ctx, "\\%s\\%s\\%s",
 613                         cli->desthost, cli->share, dir);
 614 }
 615
 616 /********************************************************************
 617  check for dfs referral
 618 ********************************************************************/
 619
 620 static bool cli_dfs_check_error( struct cli_state *cli, NTSTATUS status )
 621 {
 622         uint32 flgs2 = SVAL(cli->inbuf,smb_flg2);
 623
 624         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 625
 626         if (!((flgs2&FLAGS2_32_BIT_ERROR_CODES) &&
 627                                 (flgs2&FLAGS2_UNICODE_STRINGS)))
 628                 return false;
 629
 630         if (NT_STATUS_EQUAL(status, NT_STATUS(IVAL(cli->inbuf,smb_rcls))))
 631                 return true;
 632
 633         return false;
 634 }
 635
 636 /********************************************************************
 637  Get the dfs referral link.
 638 ********************************************************************/
 639
 640 bool cli_dfs_get_referral(TALLOC_CTX *ctx,
 641                         struct cli_state *cli,
 642                         const char *path,
 643                         CLIENT_DFS_REFERRAL**refs,
 644                         size_t *num_refs,
 645                         uint16 *consumed)
 646 {
 647         unsigned int data_len = 0;
 648         unsigned int param_len = 0;
 649         uint16 setup = TRANSACT2_GET_DFS_REFERRAL;
 650         char *param;
 651         char *rparam=NULL, *rdata=NULL;
 652         char *p;
 653         char *endp;
 654         size_t pathlen = 2*(strlen(path)+1);
 655         uint16 num_referrals;
 656         CLIENT_DFS_REFERRAL *referrals = NULL;
 657         bool ret = false;
 658
 659         *num_refs = 0;
 660         *refs = NULL;
 661
 662         param = SMB_MALLOC_ARRAY(char, 2+pathlen+2);
 663         if (!param) {
 664                 return false;
 665         }
 666         SSVAL(param, 0, 0x03);  /* max referral level */
 667         p = &param[2];
 668
 669         p += clistr_push(cli, p, path, pathlen, STR_TERMINATE);
 670         param_len = PTR_DIFF(p, param);
 671
 672         if (!cli_send_trans(cli, SMBtrans2,
 673                         NULL,                        /* name */
 674                         -1, 0,                          /* fid, flags */
 675                         &setup, 1, 0,                   /* setup, length, max */
 676                         param, param_len, 2,            /* param, length, max */
 677                         NULL, 0, cli->max_xmit /* data, length, max */
 678                         )) {
 679                 SAFE_FREE(param);
 680                 return false;
 681         }
 682
 683         SAFE_FREE(param);
 684
 685         if (!cli_receive_trans(cli, SMBtrans2,
 686                 &rparam, &param_len,
 687                 &rdata, &data_len)) {
 688                         return false;
 689         }
 690
 691         if (data_len < 4) {
 692                 goto out;
 693         }
 694
 695         endp = rdata + data_len;
 696
 697         *consumed     = SVAL(rdata, 0);
 698         num_referrals = SVAL(rdata, 2);
 699
 700         if (num_referrals != 0) {
 701                 uint16 ref_version;
 702                 uint16 ref_size;
 703                 int i;
 704                 uint16 node_offset;
 705
 706                 referrals = TALLOC_ARRAY(ctx, CLIENT_DFS_REFERRAL,
 707                                 num_referrals);
 708
 709                 if (!referrals) {
 710                         goto out;
 711                 }
 712                 /* start at the referrals array */
 713
 714                 p = rdata+8;
 715                 for (i=0; i<num_referrals && p < endp; i++) {
 716                         if (p + 18 > endp) {
 717                                 goto out;
 718                         }
 719                         ref_version = SVAL(p, 0);
 720                         ref_size    = SVAL(p, 2);
 721                         node_offset = SVAL(p, 16);
 722
 723                         if (ref_version != 3) {
 724                                 p += ref_size;
 725                                 continue;
 726                         }
 727
 728                         referrals[i].proximity = SVAL(p, 8);
 729                         referrals[i].ttl       = SVAL(p, 10);
 730
 731                         if (p + node_offset > endp) {
 732                                 goto out;
 733                         }
 734                         clistr_pull_talloc(ctx, cli, &referrals[i].dfspath,
 735                                 p+node_offset, -1,
 736                                 STR_TERMINATE|STR_UNICODE );
 737
 738                         if (!referrals[i].dfspath) {
 739                                 goto out;
 740                         }
 741                         p += ref_size;
 742                 }
 743                 if (i < num_referrals) {
 744                         goto out;
 745                 }
 746         }
 747
 748         ret = true;
 749
 750         *num_refs = num_referrals;
 751         *refs = referrals;
 752
 753   out:
 754
 755         SAFE_FREE(rdata);
 756         SAFE_FREE(rparam);
 757         return ret;
 758 }
 759
 760 /********************************************************************
 761 ********************************************************************/
 762
 763 bool cli_resolve_path(TALLOC_CTX *ctx,
 764                         const char *mountpt,
 765                         struct cli_state *rootcli,
 766                         const char *path,
 767                         struct cli_state **targetcli,
 768                         char **pp_targetpath)
 769 {
 770         CLIENT_DFS_REFERRAL *refs = NULL;
 771         size_t num_refs = 0;
 772         uint16 consumed;
 773         struct cli_state *cli_ipc = NULL;
 774         char *dfs_path = NULL;
 775         char *cleanpath = NULL;
 776         char *extrapath = NULL;
 777         int pathlen;
 778         char *server = NULL;
 779         char *share = NULL;
 780         struct cli_state *newcli = NULL;
 781         char *newpath = NULL;
 782         char *newmount = NULL;
 783         char *ppath = NULL;
 784         SMB_STRUCT_STAT sbuf;
 785         uint32 attributes;
 786
 787         if ( !rootcli || !path || !targetcli ) {
 788                 return false;
 789         }
 790
 791         /* Don't do anything if this is not a DFS root. */
 792
 793         if ( !rootcli->dfsroot) {
 794                 *targetcli = rootcli;
 795                 *pp_targetpath = talloc_strdup(ctx, path);
 796                 if (!*pp_targetpath) {
 797                         return false;
 798                 }
 799                 return true;
 800         }
 801
 802         *targetcli = NULL;
 803
 804         /* Send a trans2_query_path_info to check for a referral. */
 805
 806         cleanpath = clean_path(ctx, path);
 807         if (!cleanpath) {
 808                 return false;
 809         }
 810
 811         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 812         if (!dfs_path) {
 813                 return false;
 814         }
 815
 816         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 817                 /* This is an ordinary path, just return it. */
 818                 *targetcli = rootcli;
 819                 *pp_targetpath = talloc_strdup(ctx, path);
 820                 if (!*pp_targetpath) {
 821                         return false;
 822                 }
 823                 goto done;
 824         }
 825
 826         /* Special case where client asked for a path that does not exist */
 827
 828         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 829                 *targetcli = rootcli;
 830                 *pp_targetpath = talloc_strdup(ctx, path);
 831                 if (!*pp_targetpath) {
 832                         return false;
 833                 }
 834                 goto done;
 835         }
 836
 837         /* We got an error, check for DFS referral. */
 838
 839         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 840                 return false;
 841         }
 842
 843         /* Check for the referral. */
 844
 845         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 846                                         rootcli->desthost,
 847                                         "IPC$", false,
 848                                         (rootcli->trans_enc_state != NULL)))) {
 849                 return false;
 850         }
 851
 852         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 853                         &num_refs, &consumed) || !num_refs) {
 854                 return false;
 855         }
 856
 857         /* Just store the first referral for now. */
 858
 859         if (!refs[0].dfspath) {
 860                 return false;
 861         }
 862         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 863
 864         if (!server || !share) {
 865                 return false;
 866         }
 867
 868         /* Make sure to recreate the original string including any wildcards. */
 869
 870         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 871         if (!dfs_path) {
 872                 return false;
 873         }
 874         pathlen = strlen(dfs_path)*2;
 875         consumed = MIN(pathlen, consumed);
 876         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 877         if (!*pp_targetpath) {
 878                 return false;
 879         }
 880         dfs_path[consumed/2] = '\0';
 881
 882         /*
 883          * *pp_targetpath is now the unconsumed part of the path.
 884          * dfs_path is now the consumed part of the path
 885          * (in \server\share\path format).
 886          */
 887
 888         /* Open the connection to the target server & share */
 889         if ((*targetcli = cli_cm_open(ctx, rootcli,
 890                                         server,
 891                                         share,
 892                                         false,
 893                                         (rootcli->trans_enc_state != NULL))) == NULL) {
 894                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 895                         server, share );
 896                 return false;
 897         }
 898
 899         if (extrapath && strlen(extrapath) > 0) {
 900                 *pp_targetpath = talloc_asprintf(ctx,
 901                                                 "%s%s",
 902                                                 extrapath,
 903                                                 *pp_targetpath);
 904                 if (!*pp_targetpath) {
 905                         return false;
 906                 }
 907         }
 908
 909         /* parse out the consumed mount path */
 910         /* trim off the \server\share\ */
 911
 912         ppath = dfs_path;
 913
 914         if (*ppath != '\\') {
 915                 d_printf("cli_resolve_path: "
 916                         "dfs_path (%s) not in correct format.\n",
 917                         dfs_path );
 918                 return false;
 919         }
 920
 921         ppath++; /* Now pointing at start of server name. */
 922
 923         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 924                 return false;
 925         }
 926
 927         ppath++; /* Now pointing at start of share name. */
 928
 929         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 930                 return false;
 931         }
 932
 933         ppath++; /* Now pointing at path component. */
 934
 935         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 936         if (!newmount) {
 937                 return false;
 938         }
 939
 940         cli_cm_set_mntpoint(*targetcli, newmount);
 941
 942         /* Check for another dfs referral, note that we are not
 943            checking for loops here. */
 944
 945         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 946                 if (cli_resolve_path(ctx,
 947                                         newmount,
 948                                         *targetcli,
 949                                         *pp_targetpath,
 950                                         &newcli,
 951                                         &newpath)) {
 952                         /*
 953                          * When cli_resolve_path returns true here it's always
 954                          * returning the complete path in newpath, so we're done
 955                          * here.
 956                          */
 957                         *targetcli = newcli;
 958                         *pp_targetpath = newpath;
 959                         return true;
 960                 }
 961         }
 962
 963   done:
 964
 965         /* If returning true ensure we return a dfs root full path. */
 966         if ((*targetcli)->dfsroot) {
 967                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 968                 if (!dfs_path) {
 969                         return false;
 970                 }
 971                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 972         }
 973
 974         return true;
 975 }
 976
 977 /********************************************************************
 978 ********************************************************************/
 979
 980 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 981                                 struct cli_state *cli,
 982                                 const char *sharename,
 983                                 char **pp_newserver,
 984                                 char **pp_newshare,
 985                                 bool force_encrypt,
 986                                 const char *username,
 987                                 const char *password,
 988                                 const char *domain)
 989 {
 990         CLIENT_DFS_REFERRAL *refs = NULL;
 991         size_t num_refs = 0;
 992         uint16 consumed;
 993         char *fullpath = NULL;
 994         bool res;
 995         uint16 cnum;
 996         char *newextrapath = NULL;
 997
 998         if (!cli || !sharename) {
 999                 return false;
1000         }
1001
1002         cnum = cli->cnum;
1003
1004         /* special case.  never check for a referral on the IPC$ share */
1005
1006         if (strequal(sharename, "IPC$")) {
1007                 return false;
1008         }
1009
1010         /* send a trans2_query_path_info to check for a referral */
1011
1012         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1013         if (!fullpath) {
1014                 return false;
1015         }
1016
1017         /* check for the referral */
1018
1019         if (!cli_send_tconX(cli, "IPC$", "IPC", NULL, 0)) {
1020                 return false;
1021         }
1022
1023         if (force_encrypt) {
1024                 NTSTATUS status = cli_cm_force_encryption(cli,
1025                                         username,
1026                                         password,
1027                                         lp_workgroup(),
1028                                         "IPC$");
1029                 if (!NT_STATUS_IS_OK(status)) {
1030                         return false;
1031                 }
1032         }
1033
1034         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1035
1036         if (!cli_tdis(cli)) {
1037                 return false;
1038         }
1039
1040         cli->cnum = cnum;
1041
1042         if (!res || !num_refs) {
1043                 return false;
1044         }
1045
1046         if (!refs[0].dfspath) {
1047                 return false;
1048         }
1049
1050         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1051                         pp_newshare, &newextrapath );
1052
1053         if (!pp_newserver || !pp_newshare) {
1054                 return false;
1055         }
1056
1057         /* check that this is not a self-referral */
1058
1059         if (strequal(cli->desthost, *pp_newserver) &&
1060                         strequal(sharename, *pp_newshare)) {
1061                 return false;
1062         }
1063
1064         return true;
1065 }