source3/libsmb/clidfs.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client connect/disconnect routines
   4    Copyright (C) Andrew Tridgell                  1994-1998
   5    Copyright (C) Gerald (Jerry) Carter            2004
   6    Copyright (C) Jeremy Allison                   2007-2009
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "libsmb/libsmb.h"
  24 #include "libsmb/clirap.h"
  25 #include "msdfs.h"
  26 #include "trans2.h"
  27 #include "libsmb/nmblib.h"
  28 #include "../libcli/smb/smbXcli_base.h"
  29
  30 /********************************************************************
  31  Important point.
  32
  33  DFS paths are *always* of the form \server\share\<pathname> (the \ characters
  34  are not C escaped here).
  35
  36  - but if we're using POSIX paths then <pathname> may contain
  37    '/' separators, not '\\' separators. So cope with '\\' or '/'
  38    as a separator when looking at the pathname part.... JRA.
  39 ********************************************************************/
  40
  41 /********************************************************************
  42  Ensure a connection is encrypted.
  43 ********************************************************************/
  44
  45 NTSTATUS cli_cm_force_encryption(struct cli_state *c,
  46                         const char *username,
  47                         const char *password,
  48                         const char *domain,
  49                         const char *sharename)
  50 {
  51         NTSTATUS status = cli_force_encryption(c,
  52                                         username,
  53                                         password,
  54                                         domain);
  55
  56         if (NT_STATUS_EQUAL(status,NT_STATUS_NOT_SUPPORTED)) {
  57                 d_printf("Encryption required and "
  58                         "server that doesn't support "
  59                         "UNIX extensions - failing connect\n");
  60         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNKNOWN_REVISION)) {
  61                 d_printf("Encryption required and "
  62                         "can't get UNIX CIFS extensions "
  63                         "version from server.\n");
  64         } else if (NT_STATUS_EQUAL(status,NT_STATUS_UNSUPPORTED_COMPRESSION)) {
  65                 d_printf("Encryption required and "
  66                         "share %s doesn't support "
  67                         "encryption.\n", sharename);
  68         } else if (!NT_STATUS_IS_OK(status)) {
  69                 d_printf("Encryption required and "
  70                         "setup failed with error %s.\n",
  71                         nt_errstr(status));
  72         }
  73
  74         return status;
  75 }
  76
  77 /********************************************************************
  78  Return a connection to a server.
  79 ********************************************************************/
  80
  81 static NTSTATUS do_connect(TALLOC_CTX *ctx,
  82                                         const char *server,
  83                                         const char *share,
  84                                         const struct user_auth_info *auth_info,
  85                                         bool show_sessetup,
  86                                         bool force_encrypt,
  87                                         int max_protocol,
  88                                         int port,
  89                                         int name_type,
  90                                         struct cli_state **pcli)
  91 {
  92         struct cli_state *c = NULL;
  93         char *servicename;
  94         char *sharename;
  95         char *newserver, *newshare;
  96         const char *username;
  97         const char *password;
  98         NTSTATUS status;
  99         int flags = 0;
 100
 101         /* make a copy so we don't modify the global string 'service' */
 102         servicename = talloc_strdup(ctx,share);
 103         if (!servicename) {
 104                 return NT_STATUS_NO_MEMORY;
 105         }
 106         sharename = servicename;
 107         if (*sharename == '\\') {
 108                 sharename += 2;
 109                 if (server == NULL) {
 110                         server = sharename;
 111                 }
 112                 sharename = strchr_m(sharename,'\\');
 113                 if (!sharename) {
 114                         return NT_STATUS_NO_MEMORY;
 115                 }
 116                 *sharename = 0;
 117                 sharename++;
 118         }
 119         if (server == NULL) {
 120                 return NT_STATUS_INVALID_PARAMETER;
 121         }
 122
 123         if (get_cmdline_auth_info_use_kerberos(auth_info)) {
 124                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 125         }
 126         if (get_cmdline_auth_info_fallback_after_kerberos(auth_info)) {
 127                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 128         }
 129         if (get_cmdline_auth_info_use_ccache(auth_info)) {
 130                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 131         }
 132         if (get_cmdline_auth_info_use_pw_nt_hash(auth_info)) {
 133                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 134         }
 135
 136         status = cli_connect_nb(
 137                 server, NULL, port, name_type, NULL,
 138                 get_cmdline_auth_info_signing_state(auth_info),
 139                 flags, &c);
 140
 141         if (!NT_STATUS_IS_OK(status)) {
 142                 d_printf("Connection to %s failed (Error %s)\n",
 143                                 server,
 144                                 nt_errstr(status));
 145                 return status;
 146         }
 147
 148         if (max_protocol == 0) {
 149                 max_protocol = PROTOCOL_NT1;
 150         }
 151         DEBUG(4,(" session request ok\n"));
 152
 153         status = smbXcli_negprot(c->conn, c->timeout, PROTOCOL_CORE,
 154                                  max_protocol);
 155
 156         if (!NT_STATUS_IS_OK(status)) {
 157                 d_printf("protocol negotiation failed: %s\n",
 158                          nt_errstr(status));
 159                 cli_shutdown(c);
 160                 return status;
 161         }
 162
 163         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 164                 /* Ensure we ask for some initial credits. */
 165                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 166         }
 167
 168         username = get_cmdline_auth_info_username(auth_info);
 169         password = get_cmdline_auth_info_password(auth_info);
 170
 171         status = cli_session_setup(c, username,
 172                                    password, strlen(password),
 173                                    password, strlen(password),
 174                                    lp_workgroup());
 175         if (!NT_STATUS_IS_OK(status)) {
 176                 /* If a password was not supplied then
 177                  * try again with a null username. */
 178                 if (password[0] || !username[0] ||
 179                         get_cmdline_auth_info_use_kerberos(auth_info) ||
 180                         !NT_STATUS_IS_OK(status = cli_session_setup(c, "",
 181                                                 "", 0,
 182                                                 "", 0,
 183                                                lp_workgroup()))) {
 184                         d_printf("session setup failed: %s\n",
 185                                  nt_errstr(status));
 186                         if (NT_STATUS_EQUAL(status,
 187                                             NT_STATUS_MORE_PROCESSING_REQUIRED))
 188                                 d_printf("did you forget to run kinit?\n");
 189                         cli_shutdown(c);
 190                         return status;
 191                 }
 192                 d_printf("Anonymous login successful\n");
 193                 status = cli_init_creds(c, "", lp_workgroup(), "");
 194         } else {
 195                 status = cli_init_creds(c, username, lp_workgroup(), password);
 196         }
 197
 198         if (!NT_STATUS_IS_OK(status)) {
 199                 DEBUG(10,("cli_init_creds() failed: %s\n", nt_errstr(status)));
 200                 cli_shutdown(c);
 201                 return status;
 202         }
 203
 204         if ( show_sessetup ) {
 205                 if (*c->server_domain) {
 206                         DEBUG(0,("Domain=[%s] OS=[%s] Server=[%s]\n",
 207                                 c->server_domain,c->server_os,c->server_type));
 208                 } else if (*c->server_os || *c->server_type) {
 209                         DEBUG(0,("OS=[%s] Server=[%s]\n",
 210                                  c->server_os,c->server_type));
 211                 }
 212         }
 213         DEBUG(4,(" session setup ok\n"));
 214
 215         /* here's the fun part....to support 'msdfs proxy' shares
 216            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 217            here before trying to connect to the original share.
 218            cli_check_msdfs_proxy() will fail if it is a normal share. */
 219
 220         if ((smb1cli_conn_capabilities(c->conn) & CAP_DFS) &&
 221                         cli_check_msdfs_proxy(ctx, c, sharename,
 222                                 &newserver, &newshare,
 223                                 force_encrypt,
 224                                 username,
 225                                 password,
 226                                 lp_workgroup())) {
 227                 cli_shutdown(c);
 228                 return do_connect(ctx, newserver,
 229                                 newshare, auth_info, false,
 230                                 force_encrypt, max_protocol,
 231                                 port, name_type, pcli);
 232         }
 233
 234         /* must be a normal share */
 235
 236         status = cli_tree_connect(c, sharename, "?????",
 237                                   password, strlen(password)+1);
 238         if (!NT_STATUS_IS_OK(status)) {
 239                 d_printf("tree connect failed: %s\n", nt_errstr(status));
 240                 cli_shutdown(c);
 241                 return status;
 242         }
 243
 244         if (force_encrypt) {
 245                 status = cli_cm_force_encryption(c,
 246                                         username,
 247                                         password,
 248                                         lp_workgroup(),
 249                                         sharename);
 250                 if (!NT_STATUS_IS_OK(status)) {
 251                         cli_shutdown(c);
 252                         return status;
 253                 }
 254         }
 255
 256         DEBUG(4,(" tconx ok\n"));
 257         *pcli = c;
 258         return NT_STATUS_OK;
 259 }
 260
 261 /****************************************************************************
 262 ****************************************************************************/
 263
 264 static void cli_set_mntpoint(struct cli_state *cli, const char *mnt)
 265 {
 266         char *name = clean_name(NULL, mnt);
 267         if (!name) {
 268                 return;
 269         }
 270         TALLOC_FREE(cli->dfs_mountpoint);
 271         cli->dfs_mountpoint = talloc_strdup(cli, name);
 272         TALLOC_FREE(name);
 273 }
 274
 275 /********************************************************************
 276  Add a new connection to the list.
 277  referring_cli == NULL means a new initial connection.
 278 ********************************************************************/
 279
 280 static NTSTATUS cli_cm_connect(TALLOC_CTX *ctx,
 281                                struct cli_state *referring_cli,
 282                                const char *server,
 283                                const char *share,
 284                                const struct user_auth_info *auth_info,
 285                                bool show_hdr,
 286                                bool force_encrypt,
 287                                int max_protocol,
 288                                int port,
 289                                int name_type,
 290                                struct cli_state **pcli)
 291 {
 292         struct cli_state *cli;
 293         NTSTATUS status;
 294
 295         status = do_connect(ctx, server, share,
 296                                 auth_info,
 297                                 show_hdr, force_encrypt, max_protocol,
 298                                 port, name_type, &cli);
 299
 300         if (!NT_STATUS_IS_OK(status)) {
 301                 return status;
 302         }
 303
 304         /* Enter into the list. */
 305         if (referring_cli) {
 306                 DLIST_ADD_END(referring_cli, cli, struct cli_state *);
 307         }
 308
 309         if (referring_cli && referring_cli->requested_posix_capabilities) {
 310                 uint16 major, minor;
 311                 uint32 caplow, caphigh;
 312                 status = cli_unix_extensions_version(cli, &major, &minor,
 313                                                      &caplow, &caphigh);
 314                 if (NT_STATUS_IS_OK(status)) {
 315                         cli_set_unix_extensions_capabilities(cli,
 316                                         major, minor,
 317                                         caplow, caphigh);
 318                 }
 319         }
 320
 321         *pcli = cli;
 322         return NT_STATUS_OK;
 323 }
 324
 325 /********************************************************************
 326  Return a connection to a server on a particular share.
 327 ********************************************************************/
 328
 329 static struct cli_state *cli_cm_find(struct cli_state *cli,
 330                                 const char *server,
 331                                 const char *share)
 332 {
 333         struct cli_state *p;
 334
 335         if (cli == NULL) {
 336                 return NULL;
 337         }
 338
 339         /* Search to the start of the list. */
 340         for (p = cli; p; p = DLIST_PREV(p)) {
 341                 const char *remote_name =
 342                         smbXcli_conn_remote_name(p->conn);
 343
 344                 if (strequal(server, remote_name) &&
 345                                 strequal(share,p->share)) {
 346                         return p;
 347                 }
 348         }
 349
 350         /* Search to the end of the list. */
 351         for (p = cli->next; p; p = p->next) {
 352                 const char *remote_name =
 353                         smbXcli_conn_remote_name(p->conn);
 354
 355                 if (strequal(server, remote_name) &&
 356                                 strequal(share,p->share)) {
 357                         return p;
 358                 }
 359         }
 360
 361         return NULL;
 362 }
 363
 364 /****************************************************************************
 365  Open a client connection to a \\server\share.
 366 ****************************************************************************/
 367
 368 NTSTATUS cli_cm_open(TALLOC_CTX *ctx,
 369                                 struct cli_state *referring_cli,
 370                                 const char *server,
 371                                 const char *share,
 372                                 const struct user_auth_info *auth_info,
 373                                 bool show_hdr,
 374                                 bool force_encrypt,
 375                                 int max_protocol,
 376                                 int port,
 377                                 int name_type,
 378                                 struct cli_state **pcli)
 379 {
 380         /* Try to reuse an existing connection in this list. */
 381         struct cli_state *c = cli_cm_find(referring_cli, server, share);
 382         NTSTATUS status;
 383
 384         if (c) {
 385                 *pcli = c;
 386                 return NT_STATUS_OK;
 387         }
 388
 389         if (auth_info == NULL) {
 390                 /* Can't do a new connection
 391                  * without auth info. */
 392                 d_printf("cli_cm_open() Unable to open connection [\\%s\\%s] "
 393                         "without auth info\n",
 394                         server, share );
 395                 return NT_STATUS_INVALID_PARAMETER;
 396         }
 397
 398         status = cli_cm_connect(ctx,
 399                                 referring_cli,
 400                                 server,
 401                                 share,
 402                                 auth_info,
 403                                 show_hdr,
 404                                 force_encrypt,
 405                                 max_protocol,
 406                                 port,
 407                                 name_type,
 408                                 &c);
 409         if (!NT_STATUS_IS_OK(status)) {
 410                 return status;
 411         }
 412         *pcli = c;
 413         return NT_STATUS_OK;
 414 }
 415
 416 /****************************************************************************
 417 ****************************************************************************/
 418
 419 void cli_cm_display(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, smbXcli_conn_remote_name(cli->conn), cli->share);
 426         }
 427 }
 428
 429 /****************************************************************************
 430 ****************************************************************************/
 431
 432 /****************************************************************************
 433 ****************************************************************************/
 434
 435 #if 0
 436 void cli_cm_set_credentials(struct user_auth_info *auth_info)
 437 {
 438         SAFE_FREE(cm_creds.username);
 439         cm_creds.username = SMB_STRDUP(get_cmdline_auth_info_username(
 440                                                auth_info));
 441
 442         if (get_cmdline_auth_info_got_pass(auth_info)) {
 443                 cm_set_password(get_cmdline_auth_info_password(auth_info));
 444         }
 445
 446         cm_creds.use_kerberos = get_cmdline_auth_info_use_kerberos(auth_info);
 447         cm_creds.fallback_after_kerberos = false;
 448         cm_creds.signing_state = get_cmdline_auth_info_signing_state(auth_info);
 449 }
 450 #endif
 451
 452 /**********************************************************************
 453  split a dfs path into the server, share name, and extrapath components
 454 **********************************************************************/
 455
 456 static bool split_dfs_path(TALLOC_CTX *ctx,
 457                                 const char *nodepath,
 458                                 char **pp_server,
 459                                 char **pp_share,
 460                                 char **pp_extrapath)
 461 {
 462         char *p, *q;
 463         char *path;
 464
 465         *pp_server = NULL;
 466         *pp_share = NULL;
 467         *pp_extrapath = NULL;
 468
 469         path = talloc_strdup(ctx, nodepath);
 470         if (!path) {
 471                 goto fail;
 472         }
 473
 474         if ( path[0] != '\\' ) {
 475                 goto fail;
 476         }
 477
 478         p = strchr_m( path + 1, '\\' );
 479         if ( !p ) {
 480                 goto fail;
 481         }
 482
 483         *p = '\0';
 484         p++;
 485
 486         /* Look for any extra/deep path */
 487         q = strchr_m(p, '\\');
 488         if (q != NULL) {
 489                 *q = '\0';
 490                 q++;
 491                 *pp_extrapath = talloc_strdup(ctx, q);
 492         } else {
 493                 *pp_extrapath = talloc_strdup(ctx, "");
 494         }
 495         if (*pp_extrapath == NULL) {
 496                 goto fail;
 497         }
 498
 499         *pp_share = talloc_strdup(ctx, p);
 500         if (*pp_share == NULL) {
 501                 goto fail;
 502         }
 503
 504         *pp_server = talloc_strdup(ctx, &path[1]);
 505         if (*pp_server == NULL) {
 506                 goto fail;
 507         }
 508
 509         TALLOC_FREE(path);
 510         return true;
 511
 512 fail:
 513         TALLOC_FREE(*pp_share);
 514         TALLOC_FREE(*pp_extrapath);
 515         TALLOC_FREE(path);
 516         return false;
 517 }
 518
 519 /****************************************************************************
 520  Return the original path truncated at the directory component before
 521  the first wildcard character. Trust the caller to provide a NULL
 522  terminated string
 523 ****************************************************************************/
 524
 525 static char *clean_path(TALLOC_CTX *ctx, const char *path)
 526 {
 527         size_t len;
 528         char *p1, *p2, *p;
 529         char *path_out;
 530
 531         /* No absolute paths. */
 532         while (IS_DIRECTORY_SEP(*path)) {
 533                 path++;
 534         }
 535
 536         path_out = talloc_strdup(ctx, path);
 537         if (!path_out) {
 538                 return NULL;
 539         }
 540
 541         p1 = strchr_m(path_out, '*');
 542         p2 = strchr_m(path_out, '?');
 543
 544         if (p1 || p2) {
 545                 if (p1 && p2) {
 546                         p = MIN(p1,p2);
 547                 } else if (!p1) {
 548                         p = p2;
 549                 } else {
 550                         p = p1;
 551                 }
 552                 *p = '\0';
 553
 554                 /* Now go back to the start of this component. */
 555                 p1 = strrchr_m(path_out, '/');
 556                 p2 = strrchr_m(path_out, '\\');
 557                 p = MAX(p1,p2);
 558                 if (p) {
 559                         *p = '\0';
 560                 }
 561         }
 562
 563         /* Strip any trailing separator */
 564
 565         len = strlen(path_out);
 566         if ( (len > 0) && IS_DIRECTORY_SEP(path_out[len-1])) {
 567                 path_out[len-1] = '\0';
 568         }
 569
 570         return path_out;
 571 }
 572
 573 /****************************************************************************
 574 ****************************************************************************/
 575
 576 static char *cli_dfs_make_full_path(TALLOC_CTX *ctx,
 577                                         struct cli_state *cli,
 578                                         const char *dir)
 579 {
 580         char path_sep = '\\';
 581
 582         /* Ensure the extrapath doesn't start with a separator. */
 583         while (IS_DIRECTORY_SEP(*dir)) {
 584                 dir++;
 585         }
 586
 587         if (cli->requested_posix_capabilities & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
 588                 path_sep = '/';
 589         }
 590         return talloc_asprintf(ctx, "%c%s%c%s%c%s",
 591                         path_sep,
 592                         smbXcli_conn_remote_name(cli->conn),
 593                         path_sep,
 594                         cli->share,
 595                         path_sep,
 596                         dir);
 597 }
 598
 599 /********************************************************************
 600  check for dfs referral
 601 ********************************************************************/
 602
 603 static bool cli_dfs_check_error(struct cli_state *cli, NTSTATUS expected,
 604                                 NTSTATUS status)
 605 {
 606         /* only deal with DS when we negotiated NT_STATUS codes and UNICODE */
 607
 608         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_UNICODE)) {
 609                 return false;
 610         }
 611         if (!(smb1cli_conn_capabilities(cli->conn) & CAP_STATUS32)) {
 612                 return false;
 613         }
 614         if (NT_STATUS_EQUAL(status, expected)) {
 615                 return true;
 616         }
 617         return false;
 618 }
 619
 620 /********************************************************************
 621  Get the dfs referral link.
 622 ********************************************************************/
 623
 624 NTSTATUS cli_dfs_get_referral(TALLOC_CTX *ctx,
 625                         struct cli_state *cli,
 626                         const char *path,
 627                         struct client_dfs_referral **refs,
 628                         size_t *num_refs,
 629                         size_t *consumed)
 630 {
 631         unsigned int data_len = 0;
 632         unsigned int param_len = 0;
 633         uint16_t setup[1];
 634         uint16_t recv_flags2;
 635         uint8_t *param = NULL;
 636         uint8_t *rdata = NULL;
 637         char *p;
 638         char *endp;
 639         smb_ucs2_t *path_ucs;
 640         char *consumed_path = NULL;
 641         uint16_t consumed_ucs;
 642         uint16 num_referrals;
 643         struct client_dfs_referral *referrals = NULL;
 644         NTSTATUS status;
 645         TALLOC_CTX *frame = talloc_stackframe();
 646
 647         *num_refs = 0;
 648         *refs = NULL;
 649
 650         SSVAL(setup, 0, TRANSACT2_GET_DFS_REFERRAL);
 651
 652         param = talloc_array(talloc_tos(), uint8_t, 2);
 653         if (!param) {
 654                 status = NT_STATUS_NO_MEMORY;
 655                 goto out;
 656         }
 657         SSVAL(param, 0, 0x03);  /* max referral level */
 658
 659         param = trans2_bytes_push_str(param, smbXcli_conn_use_unicode(cli->conn),
 660                                       path, strlen(path)+1,
 661                                       NULL);
 662         if (!param) {
 663                 status = NT_STATUS_NO_MEMORY;
 664                 goto out;
 665         }
 666         param_len = talloc_get_size(param);
 667         path_ucs = (smb_ucs2_t *)&param[2];
 668
 669         status = cli_trans(talloc_tos(), cli, SMBtrans2,
 670                            NULL, 0xffff, 0, 0,
 671                            setup, 1, 0,
 672                            param, param_len, 2,
 673                            NULL, 0, CLI_BUFFER_SIZE,
 674                            &recv_flags2,
 675                            NULL, 0, NULL, /* rsetup */
 676                            NULL, 0, NULL,
 677                            &rdata, 4, &data_len);
 678         if (!NT_STATUS_IS_OK(status)) {
 679                 goto out;
 680         }
 681
 682         endp = (char *)rdata + data_len;
 683
 684         consumed_ucs  = SVAL(rdata, 0);
 685         num_referrals = SVAL(rdata, 2);
 686
 687         /* consumed_ucs is the number of bytes
 688          * of the UCS2 path consumed not counting any
 689          * terminating null. We need to convert
 690          * back to unix charset and count again
 691          * to get the number of bytes consumed from
 692          * the incoming path. */
 693
 694         errno = 0;
 695         if (pull_string_talloc(talloc_tos(),
 696                         NULL,
 697                         0,
 698                         &consumed_path,
 699                         path_ucs,
 700                         consumed_ucs,
 701                         STR_UNICODE) == 0) {
 702                 if (errno != 0) {
 703                         status = map_nt_error_from_unix(errno);
 704                 } else {
 705                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 706                 }
 707                 goto out;
 708         }
 709         if (consumed_path == NULL) {
 710                 status = map_nt_error_from_unix(errno);
 711                 goto out;
 712         }
 713         *consumed = strlen(consumed_path);
 714
 715         if (num_referrals != 0) {
 716                 uint16 ref_version;
 717                 uint16 ref_size;
 718                 int i;
 719                 uint16 node_offset;
 720
 721                 referrals = talloc_array(ctx, struct client_dfs_referral,
 722                                          num_referrals);
 723
 724                 if (!referrals) {
 725                         status = NT_STATUS_NO_MEMORY;
 726                         goto out;
 727                 }
 728                 /* start at the referrals array */
 729
 730                 p = (char *)rdata+8;
 731                 for (i=0; i<num_referrals && p < endp; i++) {
 732                         if (p + 18 > endp) {
 733                                 goto out;
 734                         }
 735                         ref_version = SVAL(p, 0);
 736                         ref_size    = SVAL(p, 2);
 737                         node_offset = SVAL(p, 16);
 738
 739                         if (ref_version != 3) {
 740                                 p += ref_size;
 741                                 continue;
 742                         }
 743
 744                         referrals[i].proximity = SVAL(p, 8);
 745                         referrals[i].ttl       = SVAL(p, 10);
 746
 747                         if (p + node_offset > endp) {
 748                                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 749                                 goto out;
 750                         }
 751                         clistr_pull_talloc(referrals,
 752                                            (const char *)rdata,
 753                                            recv_flags2,
 754                                            &referrals[i].dfspath,
 755                                            p+node_offset,
 756                                            PTR_DIFF(endp, p+node_offset),
 757                                            STR_TERMINATE|STR_UNICODE);
 758
 759                         if (!referrals[i].dfspath) {
 760                                 status = map_nt_error_from_unix(errno);
 761                                 goto out;
 762                         }
 763                         p += ref_size;
 764                 }
 765                 if (i < num_referrals) {
 766                         status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 767                         goto out;
 768                 }
 769         }
 770
 771         *num_refs = num_referrals;
 772         *refs = referrals;
 773
 774   out:
 775
 776         TALLOC_FREE(frame);
 777         return status;
 778 }
 779
 780 /********************************************************************
 781 ********************************************************************/
 782
 783 NTSTATUS cli_resolve_path(TALLOC_CTX *ctx,
 784                           const char *mountpt,
 785                           const struct user_auth_info *dfs_auth_info,
 786                           struct cli_state *rootcli,
 787                           const char *path,
 788                           struct cli_state **targetcli,
 789                           char **pp_targetpath)
 790 {
 791         struct client_dfs_referral *refs = NULL;
 792         size_t num_refs = 0;
 793         size_t consumed = 0;
 794         struct cli_state *cli_ipc = NULL;
 795         char *dfs_path = NULL;
 796         char *cleanpath = NULL;
 797         char *extrapath = NULL;
 798         int pathlen;
 799         char *server = NULL;
 800         char *share = NULL;
 801         struct cli_state *newcli = NULL;
 802         char *newpath = NULL;
 803         char *newmount = NULL;
 804         char *ppath = NULL;
 805         SMB_STRUCT_STAT sbuf;
 806         uint32 attributes;
 807         NTSTATUS status;
 808
 809         if ( !rootcli || !path || !targetcli ) {
 810                 return NT_STATUS_INVALID_PARAMETER;
 811         }
 812
 813         /* Don't do anything if this is not a DFS root. */
 814
 815         if ( !rootcli->dfsroot) {
 816                 *targetcli = rootcli;
 817                 *pp_targetpath = talloc_strdup(ctx, path);
 818                 if (!*pp_targetpath) {
 819                         return NT_STATUS_NO_MEMORY;
 820                 }
 821                 return NT_STATUS_OK;
 822         }
 823
 824         *targetcli = NULL;
 825
 826         /* Send a trans2_query_path_info to check for a referral. */
 827
 828         cleanpath = clean_path(ctx, path);
 829         if (!cleanpath) {
 830                 return NT_STATUS_NO_MEMORY;
 831         }
 832
 833         dfs_path = cli_dfs_make_full_path(ctx, rootcli, cleanpath);
 834         if (!dfs_path) {
 835                 return NT_STATUS_NO_MEMORY;
 836         }
 837
 838         status = cli_qpathinfo_basic( rootcli, dfs_path, &sbuf, &attributes);
 839         if (NT_STATUS_IS_OK(status)) {
 840                 /* This is an ordinary path, just return it. */
 841                 *targetcli = rootcli;
 842                 *pp_targetpath = talloc_strdup(ctx, path);
 843                 if (!*pp_targetpath) {
 844                         return NT_STATUS_NO_MEMORY;
 845                 }
 846                 goto done;
 847         }
 848
 849         /* Special case where client asked for a path that does not exist */
 850
 851         if (cli_dfs_check_error(rootcli, NT_STATUS_OBJECT_NAME_NOT_FOUND,
 852                                 status)) {
 853                 *targetcli = rootcli;
 854                 *pp_targetpath = talloc_strdup(ctx, path);
 855                 if (!*pp_targetpath) {
 856                         return NT_STATUS_NO_MEMORY;
 857                 }
 858                 goto done;
 859         }
 860
 861         /* We got an error, check for DFS referral. */
 862
 863         if (!cli_dfs_check_error(rootcli, NT_STATUS_PATH_NOT_COVERED,
 864                                  status)) {
 865                 return status;
 866         }
 867
 868         /* Check for the referral. */
 869
 870         status = cli_cm_open(ctx,
 871                              rootcli,
 872                              smbXcli_conn_remote_name(rootcli->conn),
 873                              "IPC$",
 874                              dfs_auth_info,
 875                              false,
 876                              smb1cli_conn_encryption_on(rootcli->conn),
 877                              smbXcli_conn_protocol(rootcli->conn),
 878                              0,
 879                              0x20,
 880                              &cli_ipc);
 881         if (!NT_STATUS_IS_OK(status)) {
 882                 return status;
 883         }
 884
 885         status = cli_dfs_get_referral(ctx, cli_ipc, dfs_path, &refs,
 886                                       &num_refs, &consumed);
 887         if (!NT_STATUS_IS_OK(status) || !num_refs) {
 888                 return status;
 889         }
 890
 891         /* Just store the first referral for now. */
 892
 893         if (!refs[0].dfspath) {
 894                 return NT_STATUS_NOT_FOUND;
 895         }
 896         if (!split_dfs_path(ctx, refs[0].dfspath, &server, &share,
 897                             &extrapath)) {
 898                 return NT_STATUS_NOT_FOUND;
 899         }
 900
 901         /* Make sure to recreate the original string including any wildcards. */
 902
 903         dfs_path = cli_dfs_make_full_path(ctx, rootcli, path);
 904         if (!dfs_path) {
 905                 return NT_STATUS_NO_MEMORY;
 906         }
 907         pathlen = strlen(dfs_path);
 908         consumed = MIN(pathlen, consumed);
 909         *pp_targetpath = talloc_strdup(ctx, &dfs_path[consumed]);
 910         if (!*pp_targetpath) {
 911                 return NT_STATUS_NO_MEMORY;
 912         }
 913         dfs_path[consumed] = '\0';
 914
 915         /*
 916          * *pp_targetpath is now the unconsumed part of the path.
 917          * dfs_path is now the consumed part of the path
 918          * (in \server\share\path format).
 919          */
 920
 921         /* Open the connection to the target server & share */
 922         status = cli_cm_open(ctx, rootcli,
 923                              server,
 924                              share,
 925                              dfs_auth_info,
 926                              false,
 927                              smb1cli_conn_encryption_on(rootcli->conn),
 928                              smbXcli_conn_protocol(rootcli->conn),
 929                              0,
 930                              0x20,
 931                              targetcli);
 932         if (!NT_STATUS_IS_OK(status)) {
 933                 d_printf("Unable to follow dfs referral [\\%s\\%s]\n",
 934                         server, share );
 935                 return status;
 936         }
 937
 938         if (extrapath && strlen(extrapath) > 0) {
 939                 /* EMC Celerra NAS version 5.6.50 (at least) doesn't appear to */
 940                 /* put the trailing \ on the path, so to be save we put one in if needed */
 941                 if (extrapath[strlen(extrapath)-1] != '\\' && **pp_targetpath != '\\') {
 942                         *pp_targetpath = talloc_asprintf(ctx,
 943                                                   "%s\\%s",
 944                                                   extrapath,
 945                                                   *pp_targetpath);
 946                 } else {
 947                         *pp_targetpath = talloc_asprintf(ctx,
 948                                                   "%s%s",
 949                                                   extrapath,
 950                                                   *pp_targetpath);
 951                 }
 952                 if (!*pp_targetpath) {
 953                         return NT_STATUS_NO_MEMORY;
 954                 }
 955         }
 956
 957         /* parse out the consumed mount path */
 958         /* trim off the \server\share\ */
 959
 960         ppath = dfs_path;
 961
 962         if (*ppath != '\\') {
 963                 d_printf("cli_resolve_path: "
 964                         "dfs_path (%s) not in correct format.\n",
 965                         dfs_path );
 966                 return NT_STATUS_NOT_FOUND;
 967         }
 968
 969         ppath++; /* Now pointing at start of server name. */
 970
 971         if ((ppath = strchr_m( dfs_path, '\\' )) == NULL) {
 972                 return NT_STATUS_NOT_FOUND;
 973         }
 974
 975         ppath++; /* Now pointing at start of share name. */
 976
 977         if ((ppath = strchr_m( ppath+1, '\\' )) == NULL) {
 978                 return NT_STATUS_NOT_FOUND;
 979         }
 980
 981         ppath++; /* Now pointing at path component. */
 982
 983         newmount = talloc_asprintf(ctx, "%s\\%s", mountpt, ppath );
 984         if (!newmount) {
 985                 return NT_STATUS_NOT_FOUND;
 986         }
 987
 988         cli_set_mntpoint(*targetcli, newmount);
 989
 990         /* Check for another dfs referral, note that we are not
 991            checking for loops here. */
 992
 993         if (!strequal(*pp_targetpath, "\\") && !strequal(*pp_targetpath, "/")) {
 994                 status = cli_resolve_path(ctx,
 995                                           newmount,
 996                                           dfs_auth_info,
 997                                           *targetcli,
 998                                           *pp_targetpath,
 999                                           &newcli,
1000                                           &newpath);
1001                 if (NT_STATUS_IS_OK(status)) {
1002                         /*
1003                          * When cli_resolve_path returns true here it's always
1004                          * returning the complete path in newpath, so we're done
1005                          * here.
1006                          */
1007                         *targetcli = newcli;
1008                         *pp_targetpath = newpath;
1009                         return status;
1010                 }
1011         }
1012
1013   done:
1014
1015         /* If returning true ensure we return a dfs root full path. */
1016         if ((*targetcli)->dfsroot) {
1017                 dfs_path = talloc_strdup(ctx, *pp_targetpath);
1018                 if (!dfs_path) {
1019                         return NT_STATUS_NO_MEMORY;
1020                 }
1021                 *pp_targetpath = cli_dfs_make_full_path(ctx, *targetcli, dfs_path);
1022                 if (*pp_targetpath == NULL) {
1023                         return NT_STATUS_NO_MEMORY;
1024                 }
1025         }
1026
1027         return NT_STATUS_OK;
1028 }
1029
1030 /********************************************************************
1031 ********************************************************************/
1032
1033 bool cli_check_msdfs_proxy(TALLOC_CTX *ctx,
1034                                 struct cli_state *cli,
1035                                 const char *sharename,
1036                                 char **pp_newserver,
1037                                 char **pp_newshare,
1038                                 bool force_encrypt,
1039                                 const char *username,
1040                                 const char *password,
1041                                 const char *domain)
1042 {
1043         struct client_dfs_referral *refs = NULL;
1044         size_t num_refs = 0;
1045         size_t consumed = 0;
1046         char *fullpath = NULL;
1047         bool res;
1048         uint16 cnum;
1049         char *newextrapath = NULL;
1050         NTSTATUS status;
1051         const char *remote_name;
1052
1053         if (!cli || !sharename) {
1054                 return false;
1055         }
1056
1057         remote_name = smbXcli_conn_remote_name(cli->conn);
1058         cnum = cli_state_get_tid(cli);
1059
1060         /* special case.  never check for a referral on the IPC$ share */
1061
1062         if (strequal(sharename, "IPC$")) {
1063                 return false;
1064         }
1065
1066         /* send a trans2_query_path_info to check for a referral */
1067
1068         fullpath = talloc_asprintf(ctx, "\\%s\\%s", remote_name, sharename);
1069         if (!fullpath) {
1070                 return false;
1071         }
1072
1073         /* check for the referral */
1074
1075         if (!NT_STATUS_IS_OK(cli_tree_connect(cli, "IPC$", "IPC", NULL, 0))) {
1076                 return false;
1077         }
1078
1079         if (force_encrypt) {
1080                 status = cli_cm_force_encryption(cli,
1081                                         username,
1082                                         password,
1083                                         lp_workgroup(),
1084                                         "IPC$");
1085                 if (!NT_STATUS_IS_OK(status)) {
1086                         return false;
1087                 }
1088         }
1089
1090         status = cli_dfs_get_referral(ctx, cli, fullpath, &refs,
1091                                       &num_refs, &consumed);
1092         res = NT_STATUS_IS_OK(status);
1093
1094         status = cli_tdis(cli);
1095         if (!NT_STATUS_IS_OK(status)) {
1096                 return false;
1097         }
1098
1099         cli_state_set_tid(cli, cnum);
1100
1101         if (!res || !num_refs) {
1102                 return false;
1103         }
1104
1105         if (!refs[0].dfspath) {
1106                 return false;
1107         }
1108
1109         if (!split_dfs_path(ctx, refs[0].dfspath, pp_newserver,
1110                             pp_newshare, &newextrapath)) {
1111                 return false;
1112         }
1113
1114         /* check that this is not a self-referral */
1115
1116         if (strequal(remote_name, *pp_newserver) &&
1117                         strequal(sharename, *pp_newshare)) {
1118                 return false;
1119         }
1120
1121         return true;
1122 }