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 static struct cm_cred_struct {
  36         char *username;
  37         char *password;
  38         bool got_pass;
  39         bool use_kerberos;
  40         bool fallback_after_kerberos;
  41         int signing_state;
  42 } cm_creds;
  43
  44 static void cm_set_password(const char *newpass);
  45
  46 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
  47                                 struct cli_state *cli,
  48                                 const char *sharename,
  49                                 char **pp_newserver,
  50                                 char **pp_newshare,
  51                                 bool force_encrypt,
  52                                 const char *username,
  53                                 const char *password,
  54                                 const char *domain);
  55
  56 /********************************************************************
  57  Ensure a connection is encrypted.
  58 ********************************************************************/
  59
  60 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  61                         const char *username,
  62                         const char *password,
  63                         const char *domain,
  64                         const char *sharename)
  65 {
  66         NTSTATUS status = cli_force_encryption(c,
  67                                         username,
  68                                         password,
  69                                         domain);
  70
  71         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  72                 d_printf("Encryption required and "
  73                         "server that doesn't support "
  74                         "UNIX extensions - failing connect\n");
  75         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  76                 d_printf("Encryption required and "
  77                         "can't get UNIX CIFS extensions "
  78                         "version from server.\n");
  79         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  80                 d_printf("Encryption required and "
  81                         "share %s doesn't support "
  82                         "encryption.\n", sharename);
  83         } else if (!NT_STATUS_IS_OK(status)) {
  84                 d_printf("Encryption required and "
  85                         "setup failed with error %s.\n",
  86                         nt_errstr(status));
  87         }
  88
  89         return status;
  90 }
  91
  92 /********************************************************************
  93  Return a connection to a server.
  94 ********************************************************************/
  95
  96 static struct cli_state *do_connect(TALLOC_CTX *ctx,
  97                                         const char *server,
  98                                         const char *share,
  99                                         bool show_sessetup,
 100                                         bool force_encrypt,
 101                                         int max_protocol,
 102                                         int port,
 103                                         int name_type)
 104 {
 105         struct cli_state *c = NULL;
 106         struct nmb_name called, calling;
 107         const char *server_n;
 108         struct sockaddr_storage ss;
 109         char *servicename;
 110         char *sharename;
 111         char *newserver, *newshare;
 112         const char *username;
 113         const char *password;
 114         NTSTATUS status;
 115
 116         /* make a copy so we don't modify the global string 'service' */
 117         servicename = talloc_strdup(ctx,share);
 118         if (!servicename) {
 119                 return NULL;
 120         }
 121         sharename = servicename;
 122         if (*sharename == '\\') {
 123                 sharename += 2;
 124                 if (server == NULL) {
 125                         server = sharename;
 126                 }
 127                 sharename = strchr_m(sharename,'\\');
 128                 if (!sharename) {
 129                         return NULL;
 130                 }
 131                 *sharename = 0;
 132                 sharename++;
 133         }
 134
 135         server_n = server;
 136
 137         zero_sockaddr(&ss);
 138
 139         make_nmb_name(&calling, global_myname(), 0x0);
 140         make_nmb_name(&called , server, name_type);
 141
 142  again:
 143         zero_sockaddr(&ss);
 144
 145         /* have to open a new connection */
 146         if (!(c=cli_initialise_ex(cm_creds.signing_state))) {
 147                 d_printf("Connection to %s failed\n", server_n);
 148                 if (c) {
 149                         cli_shutdown(c);
 150                 }
 151                 return NULL;
 152         }
 153         if (port) {
 154                 cli_set_port(c, port);
 155         }
 156
 157         status = cli_connect(c, server_n, &ss);
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 d_printf("Connection to %s failed (Error %s)\n",
 160                                 server_n,
 161                                 nt_errstr(status));
 162                 cli_shutdown(c);
 163                 return NULL;
 164         }
 165
 166         if (max_protocol == 0) {
 167                 max_protocol = PROTOCOL_NT1;
 168         }
 169         c->protocol = max_protocol;
 170         c->use_kerberos = cm_creds.use_kerberos;
 171         c->fallback_after_kerberos = cm_creds.fallback_after_kerberos;
 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         status = cli_negprot(c);
 193
 194         if (!NT_STATUS_IS_OK(status)) {
 195                 d_printf("protocol negotiation failed: %s\n",
 196                          nt_errstr(status));
 197                 cli_shutdown(c);
 198                 return NULL;
 199         }
 200
 201         if (!cm_creds.got_pass && !cm_creds.use_kerberos) {
 202                 char *label = NULL;
 203                 char *pass;
 204                 label = talloc_asprintf(ctx, "Enter %s's password: ",
 205                         cm_creds.username);
 206                 pass = getpass(label);
 207                 if (pass) {
 208                         cm_set_password(pass);
 209                 }
 210                 TALLOC_FREE(label);
 211         }
 212
 213         username = cm_creds.username ? cm_creds.username : "";
 214         password = cm_creds.password ? cm_creds.password : "";
 215
 216         if (!NT_STATUS_IS_OK(cli_session_setup(c, username,
 217                                                password, strlen(password),
 218                                                password, strlen(password),
 219                                                lp_workgroup()))) {
 220                 /* If a password was not supplied then
 221                  * try again with a null username. */
 222                 if (password[0] || !username[0] || cm_creds.use_kerberos ||
 223                     !NT_STATUS_IS_OK(cli_session_setup(c, "",
 224                                                 "", 0,
 225                                                 "", 0,
 226                                                lp_workgroup()))) {
 227                         d_printf("session setup failed: %s\n", cli_errstr(c));
 228                         if (NT_STATUS_V(cli_nt_error(c)) ==
 229                             NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 230                                 d_printf("did you forget to run kinit?\n");
 231                         cli_shutdown(c);
 232                         return NULL;
 233                 }
 234                 d_printf("Anonymous login successful\n");
 235         }
 236
 237         if ( show_sessetup ) {
 238                 if (*c->server_domain) {
 239                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 240                                 c->server_domain,c->server_os,c->server_type));
 241                 } else if (*c->server_os || *c->server_type) {
 242                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 243                                  c->server_os,c->server_type));
 244                 }
 245         }
 246         DEBUG(4,(" session setup ok\n"));
 247
 248         /* here's the fun part....to support 'msdfs proxy' shares
 249            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 250            here before trying to connect to the original share.
 251            check_dfs_proxy() will fail if it is a normal share. */
 252
 253         if ((c->capabilities & CAP_DFS) &&
 254                         cli_check_msdfs_proxy(ctx, c, sharename,
 255                                 &newserver, &newshare,
 256                                 force_encrypt,
 257                                 username,
 258                                 password,
 259                                 lp_workgroup())) {
 260                 cli_shutdown(c);
 261                 return do_connect(ctx, newserver,
 262                                 newshare, false,
 263                                 force_encrypt, max_protocol,
 264                                 port, name_type);
 265         }
 266
 267         /* must be a normal share */
 268
 269         status = cli_tcon_andx(c, sharename, "?????",
 270                                password, strlen(password)+1);
 271         if (!NT_STATUS_IS_OK(status)) {
 272                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 273                 cli_shutdown(c);
 274                 return NULL;
 275         }
 276
 277         if (force_encrypt) {
 278                 status = cli_cm_force_encryption(c,
 279                                         username,
 280                                         password,
 281                                         lp_workgroup(),
 282                                         sharename);
 283                 if (!NT_STATUS_IS_OK(status)) {
 284                         cli_shutdown(c);
 285                         return NULL;
 286                 }
 287         }
 288
 289         DEBUG(4,(" tconx ok\n"));
 290         return c;
 291 }
 292
 293 /****************************************************************************
 294 ****************************************************************************/
 295
 296 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 297 {
 298         char *name = clean_name(NULL, mnt);
 299         if (!name) {
 300                 return;
 301         }
 302         TALLOC_FREE(cli->dfs_mountpoint);
 303         cli->dfs_mountpoint = talloc_strdup(cli, name);
 304         TALLOC_FREE(name);
 305 }
 306
 307 /********************************************************************
 308  Add a new connection to the list.
 309  referring_cli == NULL means a new initial connection.
 310 ********************************************************************/
 311
 312 static struct cli_state *cli_cm_connect(TALLOC_CTX *ctx,
 313                                         struct cli_state *referring_cli,
 314                                         const char *server,
 315                                         const char *share,
 316                                         bool show_hdr,
 317                                         bool force_encrypt,
 318                                         int max_protocol,
 319                                         int port,
 320                                         int name_type)
 321 {
 322         struct cli_state *cli;
 323
 324         cli = do_connect(ctx, server, share,
 325                                 show_hdr, force_encrypt, max_protocol,
 326                                 port, name_type);
 327
 328         if (!cli ) {
 329                 return NULL;
 330         }
 331
 332         /* Enter into the list. */
 333         if (referring_cli) {
 334                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 335         }
 336
 337         if (referring_cli && referring_cli->posix_capabilities) {
 338                 uint16 major, minor;
 339                 uint32 caplow, caphigh;
 340                 if (cli_unix_extensions_version(cli, &major,
 341                                         &minor, &caplow, &caphigh)) {
 342                         cli_set_unix_extensions_capabilities(cli,
 343                                         major, minor,
 344                                         caplow, caphigh);
 345                 }
 346         }
 347
 348         return cli;
 349 }
 350
 351 /********************************************************************
 352  Return a connection to a server on a particular share.
 353 ********************************************************************/
 354
 355 static struct cli_state *cli_cm_find(struct cli_state *cli,
 356                                 const char *server,
 357                                 const char *share)
 358 {
 359         struct cli_state *p;
 360
 361         if (cli == NULL) {
 362                 return NULL;
 363         }
 364
 365         /* Search to the start of the list. */
 366         for (p = cli; p; p = p->prev) {
 367                 if (strequal(server, p->desthost) &&
 368                                 strequal(share,p->share)) {
 369                         return p;
 370                 }
 371         }
 372
 373         /* Search to the end of the list. */
 374         for (p = cli->next; p; p = p->next) {
 375                 if (strequal(server, p->desthost) &&
 376                                 strequal(share,p->share)) {
 377                         return p;
 378                 }
 379         }
 380
 381         return NULL;
 382 }
 383
 384 /****************************************************************************
 385  Open a client connection to a \\server\share.
 386 ****************************************************************************/
 387
 388 struct cli_state *cli_cm_open(TALLOC_CTX *ctx,
 389                                 struct cli_state *referring_cli,
 390                                 const char *server,
 391                                 const char *share,
 392                                 bool show_hdr,
 393                                 bool force_encrypt,
 394                                 int max_protocol,
 395                                 int port,
 396                                 int name_type)
 397 {
 398         /* Try to reuse an existing connection in this list. */
 399         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 400
 401         if (c) {
 402                 return c;
 403         }
 404
 405         return cli_cm_connect(ctx, referring_cli,
 406                                 server, share, show_hdr, force_encrypt,
 407                                 max_protocol, port, name_type);
 408 }
 409
 410 /****************************************************************************
 411 ****************************************************************************/
 412
 413 void cli_cm_display(const struct cli_state *cli)
 414 {
 415         int i;
 416
 417         for (i=0; cli; cli = cli->next,i++ ) {
 418                 d_printf("%d:\tserver=%s, share=%s\n",
 419                         i, cli->desthost, cli->share );
 420         }
 421 }
 422
 423 /****************************************************************************
 424 ****************************************************************************/
 425
 426 static void cm_set_password(const char *newpass)
 427 {
 428         SAFE_FREE(cm_creds.password);
 429         cm_creds.password = SMB_STRDUP(newpass);
 430         if (cm_creds.password) {
 431                 cm_creds.got_pass = true;
 432         }
 433 }
 434
 435 /****************************************************************************
 436 ****************************************************************************/
 437
 438 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 439 {
 440         SAFE_FREE(cm_creds.username);
 441         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 442                                                auth_info));
 443
 444         if (get_cmdline_auth_info_got_pass(auth_info)) {
 445                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 446         }
 447
 448         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 449         cm_creds.fallback_after_kerberos = false;
 450         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 451 }
 452
 453 /****************************************************************************
 454 ****************************************************************************/
 455
 456 void cli_cm_set_signing_state(int state)
 457 {
 458         cm_creds.signing_state = state;
 459 }
 460
 461 /****************************************************************************
 462 ****************************************************************************/
 463
 464 void cli_cm_set_username(const char *username)
 465 {
 466         SAFE_FREE(cm_creds.username);
 467         cm_creds.username = SMB_STRDUP(username);
 468 }
 469
 470 /****************************************************************************
 471 ****************************************************************************/
 472
 473 void cli_cm_set_password(const char *newpass)
 474 {
 475         SAFE_FREE(cm_creds.password);
 476         cm_creds.password = SMB_STRDUP(newpass);
 477         if (cm_creds.password) {
 478                 cm_creds.got_pass = true;
 479         }
 480 }
 481
 482 /****************************************************************************
 483 ****************************************************************************/
 484
 485 void cli_cm_set_use_kerberos(void)
 486 {
 487         cm_creds.use_kerberos = true;
 488 }
 489
 490 /****************************************************************************
 491 ****************************************************************************/
 492
 493 void cli_cm_set_fallback_after_kerberos(void)
 494 {
 495         cm_creds.fallback_after_kerberos = 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->inbuf,
 735                                            &referrals[i].dfspath,
 736                                            p+node_offset, -1,
 737                                            STR_TERMINATE|STR_UNICODE);
 738
 739                         if (!referrals[i].dfspath) {
 740                                 goto out;
 741                         }
 742                         p += ref_size;
 743                 }
 744                 if (i < num_referrals) {
 745                         goto out;
 746                 }
 747         }
 748
 749         ret = true;
 750
 751         *num_refs = num_referrals;
 752         *refs = referrals;
 753
 754   out:
 755
 756         SAFE_FREE(rdata);
 757         SAFE_FREE(rparam);
 758         return ret;
 759 }
 760
 761 /********************************************************************
 762 ********************************************************************/
 763
 764 bool cli_resolve_path(TALLOC_CTX *ctx,
 765                         const char *mountpt,
 766                         struct cli_state *rootcli,
 767                         const char *path,
 768                         struct cli_state **targetcli,
 769                         char **pp_targetpath)
 770 {
 771         CLIENT_DFS_REFERRAL *refs = NULL;
 772         size_t num_refs = 0;
 773         uint16 consumed;
 774         struct cli_state *cli_ipc = NULL;
 775         char *dfs_path = NULL;
 776         char *cleanpath = NULL;
 777         char *extrapath = NULL;
 778         int pathlen;
 779         char *server = NULL;
 780         char *share = NULL;
 781         struct cli_state *newcli = NULL;
 782         char *newpath = NULL;
 783         char *newmount = NULL;
 784         char *ppath = NULL;
 785         SMB_STRUCT_STAT sbuf;
 786         uint32 attributes;
 787
 788         if ( !rootcli || !path || !targetcli ) {
 789                 return false;
 790         }
 791
 792         /* Don't do anything if this is not a DFS root. */
 793
 794         if ( !rootcli->dfsroot) {
 795                 *targetcli = rootcli;
 796                 *pp_targetpath = talloc_strdup(ctx, path);
 797                 if (!*pp_targetpath) {
 798                         return false;
 799                 }
 800                 return true;
 801         }
 802
 803         *targetcli = NULL;
 804
 805         /* Send a trans2_query_path_info to check for a referral. */
 806
 807         cleanpath = clean_path(ctx, path);
 808         if (!cleanpath) {
 809                 return false;
 810         }
 811
 812         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 813         if (!dfs_path) {
 814                 return false;
 815         }
 816
 817         if (cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes)) {
 818                 /* This is an ordinary path, just return it. */
 819                 *targetcli = rootcli;
 820                 *pp_targetpath = talloc_strdup(ctx, path);
 821                 if (!*pp_targetpath) {
 822                         return false;
 823                 }
 824                 goto done;
 825         }
 826
 827         /* Special case where client asked for a path that does not exist */
 828
 829         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
 830                 *targetcli = rootcli;
 831                 *pp_targetpath = talloc_strdup(ctx, path);
 832                 if (!*pp_targetpath) {
 833                         return false;
 834                 }
 835                 goto done;
 836         }
 837
 838         /* We got an error, check for DFS referral. */
 839
 840         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED)) {
 841                 return false;
 842         }
 843
 844         /* Check for the referral. */
 845
 846         if (!(cli_ipc = cli_cm_open(ctx, rootcli,
 847                                         rootcli->desthost,
 848                                         "IPC$", false,
 849                                         (rootcli->trans_enc_state != NULL),
 850                                         rootcli->protocol,
 851                                         0,
 852                                         0x20))) {
 853                 return false;
 854         }
 855
 856         if (!cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 857                         &num_refs, &consumed) || !num_refs) {
 858                 return false;
 859         }
 860
 861         /* Just store the first referral for now. */
 862
 863         if (!refs[0].dfspath) {
 864                 return false;
 865         }
 866         split_dfs_path(ctx, refs[0].dfspath, &server, &share, &extrapath );
 867
 868         if (!server || !share) {
 869                 return false;
 870         }
 871
 872         /* Make sure to recreate the original string including any wildcards. */
 873
 874         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 875         if (!dfs_path) {
 876                 return false;
 877         }
 878         pathlen = strlen(dfs_path)*2;
 879         consumed = MIN(pathlen, consumed);
 880         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed/2]);
 881         if (!*pp_targetpath) {
 882                 return false;
 883         }
 884         dfs_path[consumed/2] = '\0';
 885
 886         /*
 887          * *pp_targetpath is now the unconsumed part of the path.
 888          * dfs_path is now the consumed part of the path
 889          * (in \server\share\path format).
 890          */
 891
 892         /* Open the connection to the target server & share */
 893         if ((*targetcli = cli_cm_open(ctx, rootcli,
 894                                         server,
 895                                         share,
 896                                         false,
 897                                         (rootcli->trans_enc_state != NULL),
 898                                         rootcli->protocol,
 899                                         0,
 900                                         0x20)) == NULL) {
 901                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 902                         server, share );
 903                 return false;
 904         }
 905
 906         if (extrapath && strlen(extrapath) > 0) {
 907                 *pp_targetpath = talloc_asprintf(ctx,
 908                                                 "%s%s",
 909                                                 extrapath,
 910                                                 *pp_targetpath);
 911                 if (!*pp_targetpath) {
 912                         return false;
 913                 }
 914         }
 915
 916         /* parse out the consumed mount path */
 917         /* trim off the \server\share\ */
 918
 919         ppath = dfs_path;
 920
 921         if (*ppath != '\\') {
 922                 d_printf("cli_resolve_path: "
 923                         "dfs_path (%s) not in correct format.\n",
 924                         dfs_path );
 925                 return false;
 926         }
 927
 928         ppath++; /* Now pointing at start of server name. */
 929
 930         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 931                 return false;
 932         }
 933
 934         ppath++; /* Now pointing at start of share name. */
 935
 936         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 937                 return false;
 938         }
 939
 940         ppath++; /* Now pointing at path component. */
 941
 942         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 943         if (!newmount) {
 944                 return false;
 945         }
 946
 947         cli_set_mntpoint(*targetcli, newmount);
 948
 949         /* Check for another dfs referral, note that we are not
 950            checking for loops here. */
 951
 952         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 953                 if (cli_resolve_path(ctx,
 954                                         newmount,
 955                                         *targetcli,
 956                                         *pp_targetpath,
 957                                         &newcli,
 958                                         &newpath)) {
 959                         /*
 960                          * When cli_resolve_path returns true here it's always
 961                          * returning the complete path in newpath, so we're done
 962                          * here.
 963                          */
 964                         *targetcli = newcli;
 965                         *pp_targetpath = newpath;
 966                         return true;
 967                 }
 968         }
 969
 970   done:
 971
 972         /* If returning true ensure we return a dfs root full path. */
 973         if ((*targetcli)->dfsroot) {
 974                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
 975                 if (!dfs_path) {
 976                         return false;
 977                 }
 978                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
 979         }
 980
 981         return true;
 982 }
 983
 984 /********************************************************************
 985 ********************************************************************/
 986
 987 static bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
 988                                 struct cli_state *cli,
 989                                 const char *sharename,
 990                                 char **pp_newserver,
 991                                 char **pp_newshare,
 992                                 bool force_encrypt,
 993                                 const char *username,
 994                                 const char *password,
 995                                 const char *domain)
 996 {
 997         CLIENT_DFS_REFERRAL *refs = NULL;
 998         size_t num_refs = 0;
 999         uint16 consumed;
1000         char *fullpath = NULL;
1001         bool res;
1002         uint16 cnum;
1003         char *newextrapath = NULL;
1004
1005         if (!cli || !sharename) {
1006                 return false;
1007         }
1008
1009         cnum = cli->cnum;
1010
1011         /* special case.  never check for a referral on the IPC$ share */
1012
1013         if (strequal(sharename, "IPC$")) {
1014                 return false;
1015         }
1016
1017         /* send a trans2_query_path_info to check for a referral */
1018
1019         fullpath = talloc_asprintf(ctx, "\\%s\\%s", cli->desthost, sharename );
1020         if (!fullpath) {
1021                 return false;
1022         }
1023
1024         /* check for the referral */
1025
1026         if (!NT_STATUS_IS_OK(cli_tcon_andx(cli, "IPC$", "IPC", NULL, 0))) {
1027                 return false;
1028         }
1029
1030         if (force_encrypt) {
1031                 NTSTATUS status = cli_cm_force_encryption(cli,
1032                                         username,
1033                                         password,
1034                                         lp_workgroup(),
1035                                         "IPC$");
1036                 if (!NT_STATUS_IS_OK(status)) {
1037                         return false;
1038                 }
1039         }
1040
1041         res = cli_dfs_get_referral(ctx, cli, fullpath, &refs, &num_refs, &consumed);
1042
1043         if (!cli_tdis(cli)) {
1044                 return false;
1045         }
1046
1047         cli->cnum = cnum;
1048
1049         if (!res || !num_refs) {
1050                 return false;
1051         }
1052
1053         if (!refs[0].dfspath) {
1054                 return false;
1055         }
1056
1057         split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1058                         pp_newshare, &newextrapath );
1059
1060         if ((*pp_newserver == NULL) || (*pp_newshare == NULL)) {
1061                 return false;
1062         }
1063
1064         /* check that this is not a self-referral */
1065
1066         if (strequal(cli->desthost, *pp_newserver) &&
1067                         strequal(sharename, *pp_newshare)) {
1068                 return false;
1069         }
1070
1071         return true;
1072 }