source3/libsmb/libsmb_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SMB client library implementation
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Richard Sharpe 2000, 2002
   6    Copyright (C) John Terpstra 2000
   7    Copyright (C) Tom Jansen (Ninja ISD) 2002
   8    Copyright (C) Derrell Lipman 2003-2008
   9    Copyright (C) Jeremy Allison 2007, 2008
  10    Copyright (C) SATOH Fumiyasu <fumiyas@osstech.co.jp> 2009.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "libsmb/libsmb.h"
  28 #include "libsmbclient.h"
  29 #include "libsmb_internal.h"
  30 #include "../librpc/gen_ndr/ndr_lsa.h"
  31 #include "rpc_client/cli_pipe.h"
  32 #include "rpc_client/cli_lsarpc.h"
  33 #include "libcli/security/security.h"
  34 #include "libsmb/nmblib.h"
  35 #include "../libcli/smb/smbXcli_base.h"
  36
  37 /*
  38  * Check a server for being alive and well.
  39  * returns 0 if the server is in shape. Returns 1 on error
  40  *
  41  * Also useable outside libsmbclient to enable external cache
  42  * to do some checks too.
  43  */
  44 int
  45 SMBC_check_server(SMBCCTX * context,
  46                   SMBCSRV * server)
  47 {
  48         time_t now;
  49
  50         if (!cli_state_is_connected(server->cli)) {
  51                 return 1;
  52         }
  53
  54         now = time_mono(NULL);
  55
  56         if (server->last_echo_time == (time_t)0 ||
  57                         now > server->last_echo_time +
  58                                 (server->cli->timeout/1000)) {
  59                 unsigned char data[16] = {0};
  60                 NTSTATUS status = cli_echo(server->cli,
  61                                         1,
  62                                         data_blob_const(data, sizeof(data)));
  63                 if (!NT_STATUS_IS_OK(status)) {
  64                         return 1;
  65                 }
  66                 server->last_echo_time = now;
  67         }
  68         return 0;
  69 }
  70
  71 /*
  72  * Remove a server from the cached server list it's unused.
  73  * On success, 0 is returned. 1 is returned if the server could not be removed.
  74  *
  75  * Also useable outside libsmbclient
  76  */
  77 int
  78 SMBC_remove_unused_server(SMBCCTX * context,
  79                           SMBCSRV * srv)
  80 {
  81         SMBCFILE * file;
  82
  83         /* are we being fooled ? */
  84         if (!context || !context->internal->initialized || !srv) {
  85                 return 1;
  86         }
  87
  88         /* Check all open files/directories for a relation with this server */
  89         for (file = context->internal->files; file; file = file->next) {
  90                 if (file->srv == srv) {
  91                         /* Still used */
  92                         DEBUG(3, ("smbc_remove_usused_server: "
  93                                   "%p still used by %p.\n",
  94                                   srv, file));
  95                         return 1;
  96                 }
  97         }
  98
  99         DLIST_REMOVE(context->internal->servers, srv);
 100
 101         cli_shutdown(srv->cli);
 102         srv->cli = NULL;
 103
 104         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
 105
 106         smbc_getFunctionRemoveCachedServer(context)(context, srv);
 107
 108         SAFE_FREE(srv);
 109         return 0;
 110 }
 111
 112 /****************************************************************
 113  * Call the auth_fn with fixed size (fstring) buffers.
 114  ***************************************************************/
 115 static void
 116 SMBC_call_auth_fn(TALLOC_CTX *ctx,
 117                   SMBCCTX *context,
 118                   const char *server,
 119                   const char *share,
 120                   char **pp_workgroup,
 121                   char **pp_username,
 122                   char **pp_password)
 123 {
 124         fstring workgroup;
 125         fstring username;
 126         fstring password;
 127         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 128
 129         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 130         strlcpy(username, *pp_username, sizeof(username));
 131         strlcpy(password, *pp_password, sizeof(password));
 132
 133         /* See if there's an authentication with context function provided */
 134         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 135         if (auth_with_context_fn)
 136         {
 137             (* auth_with_context_fn)(context,
 138                                      server, share,
 139                                      workgroup, sizeof(workgroup),
 140                                      username, sizeof(username),
 141                                      password, sizeof(password));
 142         }
 143         else
 144         {
 145             smbc_getFunctionAuthData(context)(server, share,
 146                                               workgroup, sizeof(workgroup),
 147                                               username, sizeof(username),
 148                                               password, sizeof(password));
 149         }
 150
 151         TALLOC_FREE(*pp_workgroup);
 152         TALLOC_FREE(*pp_username);
 153         TALLOC_FREE(*pp_password);
 154
 155         *pp_workgroup = talloc_strdup(ctx, workgroup);
 156         *pp_username = talloc_strdup(ctx, username);
 157         *pp_password = talloc_strdup(ctx, password);
 158 }
 159
 160
 161 void
 162 SMBC_get_auth_data(const char *server, const char *share,
 163                    char *workgroup_buf, int workgroup_buf_len,
 164                    char *username_buf, int username_buf_len,
 165                    char *password_buf, int password_buf_len)
 166 {
 167         /* Default function just uses provided data.  Nothing to do. */
 168 }
 169
 170
 171
 172 SMBCSRV *
 173 SMBC_find_server(TALLOC_CTX *ctx,
 174                  SMBCCTX *context,
 175                  const char *server,
 176                  const char *share,
 177                  char **pp_workgroup,
 178                  char **pp_username,
 179                  char **pp_password)
 180 {
 181         SMBCSRV *srv;
 182         int auth_called = 0;
 183
 184         if (!pp_workgroup || !pp_username || !pp_password) {
 185                 return NULL;
 186         }
 187
 188 check_server_cache:
 189
 190         srv = smbc_getFunctionGetCachedServer(context)(context,
 191                                                        server, share,
 192                                                        *pp_workgroup,
 193                                                        *pp_username);
 194
 195         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 196                                      !*pp_password || !(*pp_password)[0])) {
 197                 SMBC_call_auth_fn(ctx, context, server, share,
 198                                   pp_workgroup, pp_username, pp_password);
 199
 200                 /*
 201                  * However, smbc_auth_fn may have picked up info relating to
 202                  * an existing connection, so try for an existing connection
 203                  * again ...
 204                  */
 205                 auth_called = 1;
 206                 goto check_server_cache;
 207
 208         }
 209
 210         if (srv) {
 211                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 212                         /*
 213                          * This server is no good anymore
 214                          * Try to remove it and check for more possible
 215                          * servers in the cache
 216                          */
 217                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 218                                                                         srv)) {
 219                                 /*
 220                                  * We could not remove the server completely,
 221                                  * remove it from the cache so we will not get
 222                                  * it again. It will be removed when the last
 223                                  * file/dir is closed.
 224                                  */
 225                                 smbc_getFunctionRemoveCachedServer(context)(context,
 226                                                                             srv);
 227                         }
 228
 229                         /*
 230                          * Maybe there are more cached connections to this
 231                          * server
 232                          */
 233                         goto check_server_cache;
 234                 }
 235
 236                 return srv;
 237         }
 238
 239         return NULL;
 240 }
 241
 242 /*
 243  * Connect to a server, possibly on an existing connection
 244  *
 245  * Here, what we want to do is: If the server and username
 246  * match an existing connection, reuse that, otherwise, establish a
 247  * new connection.
 248  *
 249  * If we have to create a new connection, call the auth_fn to get the
 250  * info we need, unless the username and password were passed in.
 251  */
 252
 253 static SMBCSRV *
 254 SMBC_server_internal(TALLOC_CTX *ctx,
 255             SMBCCTX *context,
 256             bool connect_if_not_found,
 257             const char *server,
 258             uint16_t port,
 259             const char *share,
 260             char **pp_workgroup,
 261             char **pp_username,
 262             char **pp_password,
 263             bool *in_cache)
 264 {
 265         SMBCSRV *srv=NULL;
 266         char *workgroup = NULL;
 267         struct cli_state *c = NULL;
 268         const char *server_n = server;
 269         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 270         uint32_t fs_attrs = 0;
 271         const char *username_used;
 272         NTSTATUS status;
 273         char *newserver, *newshare;
 274         int flags = 0;
 275         struct smbXcli_tcon *tcon = NULL;
 276         int signing_state = SMB_SIGNING_DEFAULT;
 277
 278         ZERO_STRUCT(c);
 279         *in_cache = false;
 280
 281         if (server[0] == 0) {
 282                 errno = EPERM;
 283                 return NULL;
 284         }
 285
 286         /* Look for a cached connection */
 287         srv = SMBC_find_server(ctx, context, server, share,
 288                                pp_workgroup, pp_username, pp_password);
 289
 290         /*
 291          * If we found a connection and we're only allowed one share per
 292          * server...
 293          */
 294         if (srv &&
 295             share != NULL && *share != '\0' &&
 296             smbc_getOptionOneSharePerServer(context)) {
 297
 298                 /*
 299                  * ... then if there's no current connection to the share,
 300                  * connect to it.  SMBC_find_server(), or rather the function
 301                  * pointed to by context->get_cached_srv_fn which
 302                  * was called by SMBC_find_server(), will have issued a tree
 303                  * disconnect if the requested share is not the same as the
 304                  * one that was already connected.
 305                  */
 306
 307                 /*
 308                  * Use srv->cli->desthost and srv->cli->share instead of
 309                  * server and share below to connect to the actual share,
 310                  * i.e., a normal share or a referred share from
 311                  * 'msdfs proxy' share.
 312                  */
 313                 if (!cli_state_has_tcon(srv->cli)) {
 314                         /* Ensure we have accurate auth info */
 315                         SMBC_call_auth_fn(ctx, context,
 316                                           smbXcli_conn_remote_name(srv->cli->conn),
 317                                           srv->cli->share,
 318                                           pp_workgroup,
 319                                           pp_username,
 320                                           pp_password);
 321
 322                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 323                                 errno = ENOMEM;
 324                                 cli_shutdown(srv->cli);
 325                                 srv->cli = NULL;
 326                                 smbc_getFunctionRemoveCachedServer(context)(context,
 327                                                                             srv);
 328                                 return NULL;
 329                         }
 330
 331                         /*
 332                          * We don't need to renegotiate encryption
 333                          * here as the encryption context is not per
 334                          * tid.
 335                          */
 336
 337                         status = cli_tree_connect(srv->cli,
 338                                                   srv->cli->share,
 339                                                   "?????",
 340                                                   *pp_password,
 341                                                   strlen(*pp_password)+1);
 342                         if (!NT_STATUS_IS_OK(status)) {
 343                                 errno = map_errno_from_nt_status(status);
 344                                 cli_shutdown(srv->cli);
 345                                 srv->cli = NULL;
 346                                 smbc_getFunctionRemoveCachedServer(context)(context,
 347                                                                             srv);
 348                                 srv = NULL;
 349                         }
 350
 351                         /* Determine if this share supports case sensitivity */
 352                         if (is_ipc) {
 353                                 DEBUG(4,
 354                                       ("IPC$ so ignore case sensitivity\n"));
 355                                 status = NT_STATUS_OK;
 356                         } else {
 357                                 status = cli_get_fs_attr_info(c, &fs_attrs);
 358                         }
 359
 360                         if (!NT_STATUS_IS_OK(status)) {
 361                                 DEBUG(4, ("Could not retrieve "
 362                                           "case sensitivity flag: %s.\n",
 363                                           nt_errstr(status)));
 364
 365                                 /*
 366                                  * We can't determine the case sensitivity of
 367                                  * the share. We have no choice but to use the
 368                                  * user-specified case sensitivity setting.
 369                                  */
 370                                 if (smbc_getOptionCaseSensitive(context)) {
 371                                         cli_set_case_sensitive(c, True);
 372                                 } else {
 373                                         cli_set_case_sensitive(c, False);
 374                                 }
 375                         } else if (!is_ipc) {
 376                                 DEBUG(4,
 377                                       ("Case sensitive: %s\n",
 378                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 379                                         ? "True"
 380                                         : "False")));
 381                                 cli_set_case_sensitive(
 382                                         c,
 383                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 384                                          ? True
 385                                          : False));
 386                         }
 387
 388                         /*
 389                          * Regenerate the dev value since it's based on both
 390                          * server and share
 391                          */
 392                         if (srv) {
 393                                 const char *remote_name =
 394                                         smbXcli_conn_remote_name(srv->cli->conn);
 395
 396                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 397                                                    str_checksum(srv->cli->share));
 398                         }
 399                 }
 400         }
 401
 402         /* If we have a connection... */
 403         if (srv) {
 404
 405                 /* ... then we're done here.  Give 'em what they came for. */
 406                 *in_cache = true;
 407                 goto done;
 408         }
 409
 410         /* If we're not asked to connect when a connection doesn't exist... */
 411         if (! connect_if_not_found) {
 412                 /* ... then we're done here. */
 413                 return NULL;
 414         }
 415
 416         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 417                 errno = ENOMEM;
 418                 return NULL;
 419         }
 420
 421         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 422
 423         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 424
 425         status = NT_STATUS_UNSUCCESSFUL;
 426
 427         if (smbc_getOptionUseKerberos(context)) {
 428                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 429         }
 430
 431         if (smbc_getOptionFallbackAfterKerberos(context)) {
 432                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 433         }
 434
 435         if (smbc_getOptionUseCCache(context)) {
 436                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 437         }
 438
 439         if (smbc_getOptionUseNTHash(context)) {
 440                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 441         }
 442
 443         if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 444                 signing_state = SMB_SIGNING_REQUIRED;
 445         }
 446
 447         if (port == 0) {
 448                 if (share == NULL || *share == '\0' || is_ipc) {
 449                         /*
 450                          * Try 139 first for IPC$
 451                          */
 452                         status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 453                                         smbc_getNetbiosName(context),
 454                                         signing_state, flags, &c);
 455                 }
 456         }
 457
 458         if (!NT_STATUS_IS_OK(status)) {
 459                 /*
 460                  * No IPC$ or 139 did not work
 461                  */
 462                 status = cli_connect_nb(server_n, NULL, port, 0x20,
 463                                         smbc_getNetbiosName(context),
 464                                         signing_state, flags, &c);
 465         }
 466
 467         if (!NT_STATUS_IS_OK(status)) {
 468                 errno = map_errno_from_nt_status(status);
 469                 return NULL;
 470         }
 471
 472         cli_set_timeout(c, smbc_getTimeout(context));
 473
 474         status = smbXcli_negprot(c->conn, c->timeout,
 475                                  lp_client_min_protocol(),
 476                                  lp_client_max_protocol());
 477         if (!NT_STATUS_IS_OK(status)) {
 478                 cli_shutdown(c);
 479                 errno = ETIMEDOUT;
 480                 return NULL;
 481         }
 482
 483         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 484                 /* Ensure we ask for some initial credits. */
 485                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 486         }
 487
 488         username_used = *pp_username;
 489
 490         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 491                                                *pp_password,
 492                                                strlen(*pp_password),
 493                                                *pp_password,
 494                                                strlen(*pp_password),
 495                                                *pp_workgroup))) {
 496
 497                 /* Failed.  Try an anonymous login, if allowed by flags. */
 498                 username_used = "";
 499
 500                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 501                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 502                                                        *pp_password, 1,
 503                                                        *pp_password, 0,
 504                                                        *pp_workgroup))) {
 505
 506                         cli_shutdown(c);
 507                         errno = EPERM;
 508                         return NULL;
 509                 }
 510         }
 511
 512         DEBUG(4,(" session setup ok\n"));
 513
 514         /* here's the fun part....to support 'msdfs proxy' shares
 515            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 516            here before trying to connect to the original share.
 517            cli_check_msdfs_proxy() will fail if it is a normal share. */
 518
 519         if (smbXcli_conn_dfs_supported(c->conn) &&
 520                         cli_check_msdfs_proxy(ctx, c, share,
 521                                 &newserver, &newshare,
 522                                 /* FIXME: cli_check_msdfs_proxy() does
 523                                    not support smbc_smb_encrypt_level type */
 524                                 context->internal->smb_encryption_level ?
 525                                         true : false,
 526                                 *pp_username,
 527                                 *pp_password,
 528                                 *pp_workgroup)) {
 529                 cli_shutdown(c);
 530                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 531                                 newserver, port, newshare, pp_workgroup,
 532                                 pp_username, pp_password, in_cache);
 533                 TALLOC_FREE(newserver);
 534                 TALLOC_FREE(newshare);
 535                 return srv;
 536         }
 537
 538         /* must be a normal share */
 539
 540         status = cli_tree_connect(c, share, "?????", *pp_password,
 541                                   strlen(*pp_password)+1);
 542         if (!NT_STATUS_IS_OK(status)) {
 543                 errno = map_errno_from_nt_status(status);
 544                 cli_shutdown(c);
 545                 return NULL;
 546         }
 547
 548         DEBUG(4,(" tconx ok\n"));
 549
 550         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 551                 tcon = c->smb2.tcon;
 552         } else {
 553                 tcon = c->smb1.tcon;
 554         }
 555
 556         /* Determine if this share supports case sensitivity */
 557         if (is_ipc) {
 558                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 559                 status = NT_STATUS_OK;
 560         } else {
 561                 status = cli_get_fs_attr_info(c, &fs_attrs);
 562         }
 563
 564         if (!NT_STATUS_IS_OK(status)) {
 565                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 566                           nt_errstr(status)));
 567
 568                 /*
 569                  * We can't determine the case sensitivity of the share. We
 570                  * have no choice but to use the user-specified case
 571                  * sensitivity setting.
 572                  */
 573                 if (smbc_getOptionCaseSensitive(context)) {
 574                         cli_set_case_sensitive(c, True);
 575                 } else {
 576                         cli_set_case_sensitive(c, False);
 577                 }
 578         } else if (!is_ipc) {
 579                 DEBUG(4, ("Case sensitive: %s\n",
 580                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 581                            ? "True"
 582                            : "False")));
 583                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 584         }
 585
 586         if (context->internal->smb_encryption_level) {
 587                 /* Attempt UNIX smb encryption. */
 588                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 589                                                           username_used,
 590                                                           *pp_password,
 591                                                           *pp_workgroup))) {
 592
 593                         /*
 594                          * context->smb_encryption_level == 1
 595                          * means don't fail if encryption can't be negotiated,
 596                          * == 2 means fail if encryption can't be negotiated.
 597                          */
 598
 599                         DEBUG(4,(" SMB encrypt failed\n"));
 600
 601                         if (context->internal->smb_encryption_level == 2) {
 602                                 cli_shutdown(c);
 603                                 errno = EPERM;
 604                                 return NULL;
 605                         }
 606                 }
 607                 DEBUG(4,(" SMB encrypt ok\n"));
 608         }
 609
 610         /*
 611          * Ok, we have got a nice connection
 612          * Let's allocate a server structure.
 613          */
 614
 615         srv = SMB_MALLOC_P(SMBCSRV);
 616         if (!srv) {
 617                 cli_shutdown(c);
 618                 errno = ENOMEM;
 619                 return NULL;
 620         }
 621
 622         ZERO_STRUCTP(srv);
 623         DLIST_ADD(srv->cli, c);
 624         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 625         srv->no_pathinfo = False;
 626         srv->no_pathinfo2 = False;
 627         srv->no_pathinfo3 = False;
 628         srv->no_nt_session = False;
 629
 630 done:
 631         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 632                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 633         } else {
 634                 workgroup = *pp_workgroup;
 635         }
 636         if(!workgroup) {
 637                 if (c != NULL) {
 638                         cli_shutdown(c);
 639                 }
 640                 SAFE_FREE(srv);
 641                 return NULL;
 642         }
 643
 644         /* set the credentials to make DFS work */
 645         smbc_set_credentials_with_fallback(context,
 646                                            workgroup,
 647                                            *pp_username,
 648                                            *pp_password);
 649
 650         return srv;
 651 }
 652
 653 SMBCSRV *
 654 SMBC_server(TALLOC_CTX *ctx,
 655                 SMBCCTX *context,
 656                 bool connect_if_not_found,
 657                 const char *server,
 658                 uint16_t port,
 659                 const char *share,
 660                 char **pp_workgroup,
 661                 char **pp_username,
 662                 char **pp_password)
 663 {
 664         SMBCSRV *srv=NULL;
 665         bool in_cache = false;
 666
 667         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 668                         server, port, share, pp_workgroup,
 669                         pp_username, pp_password, &in_cache);
 670
 671         if (!srv) {
 672                 return NULL;
 673         }
 674         if (in_cache) {
 675                 return srv;
 676         }
 677
 678         /* Now add it to the cache (internal or external)  */
 679         /* Let the cache function set errno if it wants to */
 680         errno = 0;
 681         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 682                                                 server, share,
 683                                                 *pp_workgroup,
 684                                                 *pp_username)) {
 685                 int saved_errno = errno;
 686                 DEBUG(3, (" Failed to add server to cache\n"));
 687                 errno = saved_errno;
 688                 if (errno == 0) {
 689                         errno = ENOMEM;
 690                 }
 691                 SAFE_FREE(srv);
 692                 return NULL;
 693         }
 694
 695         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 696                 server, share, srv));
 697
 698         DLIST_ADD(context->internal->servers, srv);
 699         return srv;
 700 }
 701
 702 /*
 703  * Connect to a server for getting/setting attributes, possibly on an existing
 704  * connection.  This works similarly to SMBC_server().
 705  */
 706 SMBCSRV *
 707 SMBC_attr_server(TALLOC_CTX *ctx,
 708                  SMBCCTX *context,
 709                  const char *server,
 710                  uint16_t port,
 711                  const char *share,
 712                  char **pp_workgroup,
 713                  char **pp_username,
 714                  char **pp_password)
 715 {
 716         int flags;
 717         struct cli_state *ipc_cli = NULL;
 718         struct rpc_pipe_client *pipe_hnd = NULL;
 719         NTSTATUS nt_status;
 720         SMBCSRV *srv=NULL;
 721         SMBCSRV *ipc_srv=NULL;
 722
 723         /*
 724          * Use srv->cli->desthost and srv->cli->share instead of
 725          * server and share below to connect to the actual share,
 726          * i.e., a normal share or a referred share from
 727          * 'msdfs proxy' share.
 728          */
 729         srv = SMBC_server(ctx, context, true, server, port, share,
 730                         pp_workgroup, pp_username, pp_password);
 731         if (!srv) {
 732                 return NULL;
 733         }
 734         server = smbXcli_conn_remote_name(srv->cli->conn);
 735         share = srv->cli->share;
 736
 737         /*
 738          * See if we've already created this special connection.  Reference
 739          * our "special" share name '*IPC$', which is an impossible real share
 740          * name due to the leading asterisk.
 741          */
 742         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 743                                    pp_workgroup, pp_username, pp_password);
 744         if (!ipc_srv) {
 745                 int signing_state = SMB_SIGNING_DEFAULT;
 746
 747                 /* We didn't find a cached connection.  Get the password */
 748                 if (!*pp_password || (*pp_password)[0] == '\0') {
 749                         /* ... then retrieve it now. */
 750                         SMBC_call_auth_fn(ctx, context, server, share,
 751                                           pp_workgroup,
 752                                           pp_username,
 753                                           pp_password);
 754                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 755                                 errno = ENOMEM;
 756                                 return NULL;
 757                         }
 758                 }
 759
 760                 flags = 0;
 761                 if (smbc_getOptionUseKerberos(context)) {
 762                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 763                 }
 764                 if (smbc_getOptionUseCCache(context)) {
 765                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 766                 }
 767                 if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 768                         signing_state = SMB_SIGNING_REQUIRED;
 769                 }
 770
 771                 nt_status = cli_full_connection(&ipc_cli,
 772                                                 lp_netbios_name(), server,
 773                                                 NULL, 0, "IPC$", "?????",
 774                                                 *pp_username,
 775                                                 *pp_workgroup,
 776                                                 *pp_password,
 777                                                 flags,
 778                                                 signing_state);
 779                 if (! NT_STATUS_IS_OK(nt_status)) {
 780                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 781                                  nt_errstr(nt_status)));
 782                         errno = ENOTSUP;
 783                         return NULL;
 784                 }
 785
 786                 if (context->internal->smb_encryption_level) {
 787                         /* Attempt UNIX smb encryption. */
 788                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 789                                                                   *pp_username,
 790                                                                   *pp_password,
 791                                                                   *pp_workgroup))) {
 792
 793                                 /*
 794                                  * context->smb_encryption_level ==
 795                                  * 1 means don't fail if encryption can't be
 796                                  * negotiated, == 2 means fail if encryption
 797                                  * can't be negotiated.
 798                                  */
 799
 800                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 801
 802                                 if (context->internal->smb_encryption_level == 2) {
 803                                         cli_shutdown(ipc_cli);
 804                                         errno = EPERM;
 805                                         return NULL;
 806                                 }
 807                         }
 808                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 809                 }
 810
 811                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 812                 if (!ipc_srv) {
 813                         errno = ENOMEM;
 814                         cli_shutdown(ipc_cli);
 815                         return NULL;
 816                 }
 817
 818                 ZERO_STRUCTP(ipc_srv);
 819                 DLIST_ADD(ipc_srv->cli, ipc_cli);
 820
 821                 nt_status = cli_rpc_pipe_open_noauth(
 822                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 823                 if (!NT_STATUS_IS_OK(nt_status)) {
 824                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 825                         errno = ENOTSUP;
 826                         cli_shutdown(ipc_srv->cli);
 827                         free(ipc_srv);
 828                         return NULL;
 829                 }
 830
 831                 /*
 832                  * Some systems don't support
 833                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 834                  * so we might as well do it too.
 835                  */
 836
 837                 nt_status = rpccli_lsa_open_policy(
 838                         pipe_hnd,
 839                         talloc_tos(),
 840                         True,
 841                         GENERIC_EXECUTE_ACCESS,
 842                         &ipc_srv->pol);
 843
 844                 if (!NT_STATUS_IS_OK(nt_status)) {
 845                         errno = SMBC_errno(context, ipc_srv->cli);
 846                         cli_shutdown(ipc_srv->cli);
 847                         free(ipc_srv);
 848                         return NULL;
 849                 }
 850
 851                 /* now add it to the cache (internal or external) */
 852
 853                 errno = 0;      /* let cache function set errno if it likes */
 854                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 855                                                              server,
 856                                                              "*IPC$",
 857                                                              *pp_workgroup,
 858                                                              *pp_username)) {
 859                         DEBUG(3, (" Failed to add server to cache\n"));
 860                         if (errno == 0) {
 861                                 errno = ENOMEM;
 862                         }
 863                         cli_shutdown(ipc_srv->cli);
 864                         free(ipc_srv);
 865                         return NULL;
 866                 }
 867
 868                 DLIST_ADD(context->internal->servers, ipc_srv);
 869         }
 870
 871         return ipc_srv;
 872 }