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         if (!cli_state_is_connected(server->cli)) {
  49                 return 1;
  50         }
  51
  52         return 0;
  53 }
  54
  55 /*
  56  * Remove a server from the cached server list it's unused.
  57  * On success, 0 is returned. 1 is returned if the server could not be removed.
  58  *
  59  * Also useable outside libsmbclient
  60  */
  61 int
  62 SMBC_remove_unused_server(SMBCCTX * context,
  63                           SMBCSRV * srv)
  64 {
  65         SMBCFILE * file;
  66
  67         /* are we being fooled ? */
  68         if (!context || !context->internal->initialized || !srv) {
  69                 return 1;
  70         }
  71
  72         /* Check all open files/directories for a relation with this server */
  73         for (file = context->internal->files; file; file = file->next) {
  74                 if (file->srv == srv) {
  75                         /* Still used */
  76                         DEBUG(3, ("smbc_remove_usused_server: "
  77                                   "%p still used by %p.\n",
  78                                   srv, file));
  79                         return 1;
  80                 }
  81         }
  82
  83         DLIST_REMOVE(context->internal->servers, srv);
  84
  85         cli_shutdown(srv->cli);
  86         srv->cli = NULL;
  87
  88         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  89
  90         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  91
  92         SAFE_FREE(srv);
  93         return 0;
  94 }
  95
  96 /****************************************************************
  97  * Call the auth_fn with fixed size (fstring) buffers.
  98  ***************************************************************/
  99 static void
 100 SMBC_call_auth_fn(TALLOC_CTX *ctx,
 101                   SMBCCTX *context,
 102                   const char *server,
 103                   const char *share,
 104                   char **pp_workgroup,
 105                   char **pp_username,
 106                   char **pp_password)
 107 {
 108         fstring workgroup;
 109         fstring username;
 110         fstring password;
 111         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 112
 113         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 114         strlcpy(username, *pp_username, sizeof(username));
 115         strlcpy(password, *pp_password, sizeof(password));
 116
 117         /* See if there's an authentication with context function provided */
 118         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 119         if (auth_with_context_fn)
 120         {
 121             (* auth_with_context_fn)(context,
 122                                      server, share,
 123                                      workgroup, sizeof(workgroup),
 124                                      username, sizeof(username),
 125                                      password, sizeof(password));
 126         }
 127         else
 128         {
 129             smbc_getFunctionAuthData(context)(server, share,
 130                                               workgroup, sizeof(workgroup),
 131                                               username, sizeof(username),
 132                                               password, sizeof(password));
 133         }
 134
 135         TALLOC_FREE(*pp_workgroup);
 136         TALLOC_FREE(*pp_username);
 137         TALLOC_FREE(*pp_password);
 138
 139         *pp_workgroup = talloc_strdup(ctx, workgroup);
 140         *pp_username = talloc_strdup(ctx, username);
 141         *pp_password = talloc_strdup(ctx, password);
 142 }
 143
 144
 145 void
 146 SMBC_get_auth_data(const char *server, const char *share,
 147                    char *workgroup_buf, int workgroup_buf_len,
 148                    char *username_buf, int username_buf_len,
 149                    char *password_buf, int password_buf_len)
 150 {
 151         /* Default function just uses provided data.  Nothing to do. */
 152 }
 153
 154
 155
 156 SMBCSRV *
 157 SMBC_find_server(TALLOC_CTX *ctx,
 158                  SMBCCTX *context,
 159                  const char *server,
 160                  const char *share,
 161                  char **pp_workgroup,
 162                  char **pp_username,
 163                  char **pp_password)
 164 {
 165         SMBCSRV *srv;
 166         int auth_called = 0;
 167
 168         if (!pp_workgroup || !pp_username || !pp_password) {
 169                 return NULL;
 170         }
 171
 172 check_server_cache:
 173
 174         srv = smbc_getFunctionGetCachedServer(context)(context,
 175                                                        server, share,
 176                                                        *pp_workgroup,
 177                                                        *pp_username);
 178
 179         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 180                                      !*pp_password || !(*pp_password)[0])) {
 181                 SMBC_call_auth_fn(ctx, context, server, share,
 182                                   pp_workgroup, pp_username, pp_password);
 183
 184                 /*
 185                  * However, smbc_auth_fn may have picked up info relating to
 186                  * an existing connection, so try for an existing connection
 187                  * again ...
 188                  */
 189                 auth_called = 1;
 190                 goto check_server_cache;
 191
 192         }
 193
 194         if (srv) {
 195                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 196                         /*
 197                          * This server is no good anymore
 198                          * Try to remove it and check for more possible
 199                          * servers in the cache
 200                          */
 201                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 202                                                                         srv)) {
 203                                 /*
 204                                  * We could not remove the server completely,
 205                                  * remove it from the cache so we will not get
 206                                  * it again. It will be removed when the last
 207                                  * file/dir is closed.
 208                                  */
 209                                 smbc_getFunctionRemoveCachedServer(context)(context,
 210                                                                             srv);
 211                         }
 212
 213                         /*
 214                          * Maybe there are more cached connections to this
 215                          * server
 216                          */
 217                         goto check_server_cache;
 218                 }
 219
 220                 return srv;
 221         }
 222
 223         return NULL;
 224 }
 225
 226 /*
 227  * Connect to a server, possibly on an existing connection
 228  *
 229  * Here, what we want to do is: If the server and username
 230  * match an existing connection, reuse that, otherwise, establish a
 231  * new connection.
 232  *
 233  * If we have to create a new connection, call the auth_fn to get the
 234  * info we need, unless the username and password were passed in.
 235  */
 236
 237 static SMBCSRV *
 238 SMBC_server_internal(TALLOC_CTX *ctx,
 239             SMBCCTX *context,
 240             bool connect_if_not_found,
 241             const char *server,
 242             uint16_t port,
 243             const char *share,
 244             char **pp_workgroup,
 245             char **pp_username,
 246             char **pp_password,
 247             bool *in_cache)
 248 {
 249         SMBCSRV *srv=NULL;
 250         char *workgroup = NULL;
 251         struct cli_state *c = NULL;
 252         const char *server_n = server;
 253         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 254         uint32 fs_attrs = 0;
 255         const char *username_used;
 256         NTSTATUS status;
 257         char *newserver, *newshare;
 258         int flags = 0;
 259         struct smbXcli_tcon *tcon = NULL;
 260
 261         ZERO_STRUCT(c);
 262         *in_cache = false;
 263
 264         if (server[0] == 0) {
 265                 errno = EPERM;
 266                 return NULL;
 267         }
 268
 269         /* Look for a cached connection */
 270         srv = SMBC_find_server(ctx, context, server, share,
 271                                pp_workgroup, pp_username, pp_password);
 272
 273         /*
 274          * If we found a connection and we're only allowed one share per
 275          * server...
 276          */
 277         if (srv &&
 278             share != NULL && *share != '\0' &&
 279             smbc_getOptionOneSharePerServer(context)) {
 280
 281                 /*
 282                  * ... then if there's no current connection to the share,
 283                  * connect to it.  SMBC_find_server(), or rather the function
 284                  * pointed to by context->get_cached_srv_fn which
 285                  * was called by SMBC_find_server(), will have issued a tree
 286                  * disconnect if the requested share is not the same as the
 287                  * one that was already connected.
 288                  */
 289
 290                 /*
 291                  * Use srv->cli->desthost and srv->cli->share instead of
 292                  * server and share below to connect to the actual share,
 293                  * i.e., a normal share or a referred share from
 294                  * 'msdfs proxy' share.
 295                  */
 296                 if (!cli_state_has_tcon(srv->cli)) {
 297                         /* Ensure we have accurate auth info */
 298                         SMBC_call_auth_fn(ctx, context,
 299                                           smbXcli_conn_remote_name(srv->cli->conn),
 300                                           srv->cli->share,
 301                                           pp_workgroup,
 302                                           pp_username,
 303                                           pp_password);
 304
 305                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 306                                 errno = ENOMEM;
 307                                 cli_shutdown(srv->cli);
 308                                 srv->cli = NULL;
 309                                 smbc_getFunctionRemoveCachedServer(context)(context,
 310                                                                             srv);
 311                                 return NULL;
 312                         }
 313
 314                         /*
 315                          * We don't need to renegotiate encryption
 316                          * here as the encryption context is not per
 317                          * tid.
 318                          */
 319
 320                         status = cli_tree_connect(srv->cli,
 321                                                   srv->cli->share,
 322                                                   "?????",
 323                                                   *pp_password,
 324                                                   strlen(*pp_password)+1);
 325                         if (!NT_STATUS_IS_OK(status)) {
 326                                 errno = map_errno_from_nt_status(status);
 327                                 cli_shutdown(srv->cli);
 328                                 srv->cli = NULL;
 329                                 smbc_getFunctionRemoveCachedServer(context)(context,
 330                                                                             srv);
 331                                 srv = NULL;
 332                         }
 333
 334                         /* Determine if this share supports case sensitivity */
 335                         if (is_ipc) {
 336                                 DEBUG(4,
 337                                       ("IPC$ so ignore case sensitivity\n"));
 338                                 status = NT_STATUS_OK;
 339                         } else {
 340                                 status = cli_get_fs_attr_info(c, &fs_attrs);
 341                         }
 342
 343                         if (!NT_STATUS_IS_OK(status)) {
 344                                 DEBUG(4, ("Could not retrieve "
 345                                           "case sensitivity flag: %s.\n",
 346                                           nt_errstr(status)));
 347
 348                                 /*
 349                                  * We can't determine the case sensitivity of
 350                                  * the share. We have no choice but to use the
 351                                  * user-specified case sensitivity setting.
 352                                  */
 353                                 if (smbc_getOptionCaseSensitive(context)) {
 354                                         cli_set_case_sensitive(c, True);
 355                                 } else {
 356                                         cli_set_case_sensitive(c, False);
 357                                 }
 358                         } else if (!is_ipc) {
 359                                 DEBUG(4,
 360                                       ("Case sensitive: %s\n",
 361                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 362                                         ? "True"
 363                                         : "False")));
 364                                 cli_set_case_sensitive(
 365                                         c,
 366                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 367                                          ? True
 368                                          : False));
 369                         }
 370
 371                         /*
 372                          * Regenerate the dev value since it's based on both
 373                          * server and share
 374                          */
 375                         if (srv) {
 376                                 const char *remote_name =
 377                                         smbXcli_conn_remote_name(srv->cli->conn);
 378
 379                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 380                                                    str_checksum(srv->cli->share));
 381                         }
 382                 }
 383         }
 384
 385         /* If we have a connection... */
 386         if (srv) {
 387
 388                 /* ... then we're done here.  Give 'em what they came for. */
 389                 *in_cache = true;
 390                 goto done;
 391         }
 392
 393         /* If we're not asked to connect when a connection doesn't exist... */
 394         if (! connect_if_not_found) {
 395                 /* ... then we're done here. */
 396                 return NULL;
 397         }
 398
 399         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 400                 errno = ENOMEM;
 401                 return NULL;
 402         }
 403
 404         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 405
 406         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 407
 408         status = NT_STATUS_UNSUCCESSFUL;
 409
 410         if (smbc_getOptionUseKerberos(context)) {
 411                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 412         }
 413
 414         if (smbc_getOptionFallbackAfterKerberos(context)) {
 415                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 416         }
 417
 418         if (smbc_getOptionUseCCache(context)) {
 419                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 420         }
 421
 422         if (smbc_getOptionUseNTHash(context)) {
 423                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 424         }
 425
 426         if (port == 0) {
 427                 if (share == NULL || *share == '\0' || is_ipc) {
 428                         /*
 429                          * Try 139 first for IPC$
 430                          */
 431                         status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 432                                         smbc_getNetbiosName(context),
 433                                         SMB_SIGNING_DEFAULT, flags, &c);
 434                 }
 435         }
 436
 437         if (!NT_STATUS_IS_OK(status)) {
 438                 /*
 439                  * No IPC$ or 139 did not work
 440                  */
 441                 status = cli_connect_nb(server_n, NULL, port, 0x20,
 442                                         smbc_getNetbiosName(context),
 443                                         SMB_SIGNING_DEFAULT, flags, &c);
 444         }
 445
 446         if (!NT_STATUS_IS_OK(status)) {
 447                 errno = map_errno_from_nt_status(status);
 448                 return NULL;
 449         }
 450
 451         cli_set_timeout(c, smbc_getTimeout(context));
 452
 453         status = smbXcli_negprot(c->conn, c->timeout,
 454                                  lp_cli_minprotocol(),
 455                                  lp_cli_maxprotocol());
 456         if (!NT_STATUS_IS_OK(status)) {
 457                 cli_shutdown(c);
 458                 errno = ETIMEDOUT;
 459                 return NULL;
 460         }
 461
 462         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 463                 /* Ensure we ask for some initial credits. */
 464                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 465         }
 466
 467         username_used = *pp_username;
 468
 469         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 470                                                *pp_password,
 471                                                strlen(*pp_password),
 472                                                *pp_password,
 473                                                strlen(*pp_password),
 474                                                *pp_workgroup))) {
 475
 476                 /* Failed.  Try an anonymous login, if allowed by flags. */
 477                 username_used = "";
 478
 479                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 480                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 481                                                        *pp_password, 1,
 482                                                        *pp_password, 0,
 483                                                        *pp_workgroup))) {
 484
 485                         cli_shutdown(c);
 486                         errno = EPERM;
 487                         return NULL;
 488                 }
 489         }
 490
 491         status = cli_init_creds(c, username_used,
 492                                 *pp_workgroup, *pp_password);
 493         if (!NT_STATUS_IS_OK(status)) {
 494                 errno = map_errno_from_nt_status(status);
 495                 cli_shutdown(c);
 496                 return NULL;
 497         }
 498
 499         DEBUG(4,(" session setup ok\n"));
 500
 501         /* here's the fun part....to support 'msdfs proxy' shares
 502            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 503            here before trying to connect to the original share.
 504            cli_check_msdfs_proxy() will fail if it is a normal share. */
 505
 506         if (smbXcli_conn_dfs_supported(c->conn) &&
 507                         cli_check_msdfs_proxy(ctx, c, share,
 508                                 &newserver, &newshare,
 509                                 /* FIXME: cli_check_msdfs_proxy() does
 510                                    not support smbc_smb_encrypt_level type */
 511                                 context->internal->smb_encryption_level ?
 512                                         true : false,
 513                                 *pp_username,
 514                                 *pp_password,
 515                                 *pp_workgroup)) {
 516                 cli_shutdown(c);
 517                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 518                                 newserver, port, newshare, pp_workgroup,
 519                                 pp_username, pp_password, in_cache);
 520                 TALLOC_FREE(newserver);
 521                 TALLOC_FREE(newshare);
 522                 return srv;
 523         }
 524
 525         /* must be a normal share */
 526
 527         status = cli_tree_connect(c, share, "?????", *pp_password,
 528                                   strlen(*pp_password)+1);
 529         if (!NT_STATUS_IS_OK(status)) {
 530                 errno = map_errno_from_nt_status(status);
 531                 cli_shutdown(c);
 532                 return NULL;
 533         }
 534
 535         DEBUG(4,(" tconx ok\n"));
 536
 537         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 538                 tcon = c->smb2.tcon;
 539         } else {
 540                 tcon = c->smb1.tcon;
 541         }
 542
 543         /* Determine if this share supports case sensitivity */
 544         if (is_ipc) {
 545                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 546                 status = NT_STATUS_OK;
 547         } else {
 548                 status = cli_get_fs_attr_info(c, &fs_attrs);
 549         }
 550
 551         if (!NT_STATUS_IS_OK(status)) {
 552                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 553                           nt_errstr(status)));
 554
 555                 /*
 556                  * We can't determine the case sensitivity of the share. We
 557                  * have no choice but to use the user-specified case
 558                  * sensitivity setting.
 559                  */
 560                 if (smbc_getOptionCaseSensitive(context)) {
 561                         cli_set_case_sensitive(c, True);
 562                 } else {
 563                         cli_set_case_sensitive(c, False);
 564                 }
 565         } else if (!is_ipc) {
 566                 DEBUG(4, ("Case sensitive: %s\n",
 567                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 568                            ? "True"
 569                            : "False")));
 570                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 571         }
 572
 573         if (context->internal->smb_encryption_level) {
 574                 /* Attempt UNIX smb encryption. */
 575                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 576                                                           username_used,
 577                                                           *pp_password,
 578                                                           *pp_workgroup))) {
 579
 580                         /*
 581                          * context->smb_encryption_level == 1
 582                          * means don't fail if encryption can't be negotiated,
 583                          * == 2 means fail if encryption can't be negotiated.
 584                          */
 585
 586                         DEBUG(4,(" SMB encrypt failed\n"));
 587
 588                         if (context->internal->smb_encryption_level == 2) {
 589                                 cli_shutdown(c);
 590                                 errno = EPERM;
 591                                 return NULL;
 592                         }
 593                 }
 594                 DEBUG(4,(" SMB encrypt ok\n"));
 595         }
 596
 597         /*
 598          * Ok, we have got a nice connection
 599          * Let's allocate a server structure.
 600          */
 601
 602         srv = SMB_MALLOC_P(SMBCSRV);
 603         if (!srv) {
 604                 cli_shutdown(c);
 605                 errno = ENOMEM;
 606                 return NULL;
 607         }
 608
 609         ZERO_STRUCTP(srv);
 610         srv->cli = c;
 611         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 612         srv->no_pathinfo = False;
 613         srv->no_pathinfo2 = False;
 614         srv->no_pathinfo3 = False;
 615         srv->no_nt_session = False;
 616
 617 done:
 618         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 619                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 620         } else {
 621                 workgroup = *pp_workgroup;
 622         }
 623         if(!workgroup) {
 624                 if (c != NULL) {
 625                         cli_shutdown(c);
 626                 }
 627                 SAFE_FREE(srv);
 628                 return NULL;
 629         }
 630
 631         /* set the credentials to make DFS work */
 632         smbc_set_credentials_with_fallback(context,
 633                                            workgroup,
 634                                            *pp_username,
 635                                            *pp_password);
 636
 637         return srv;
 638 }
 639
 640 SMBCSRV *
 641 SMBC_server(TALLOC_CTX *ctx,
 642                 SMBCCTX *context,
 643                 bool connect_if_not_found,
 644                 const char *server,
 645                 uint16_t port,
 646                 const char *share,
 647                 char **pp_workgroup,
 648                 char **pp_username,
 649                 char **pp_password)
 650 {
 651         SMBCSRV *srv=NULL;
 652         bool in_cache = false;
 653
 654         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 655                         server, port, share, pp_workgroup,
 656                         pp_username, pp_password, &in_cache);
 657
 658         if (!srv) {
 659                 return NULL;
 660         }
 661         if (in_cache) {
 662                 return srv;
 663         }
 664
 665         /* Now add it to the cache (internal or external)  */
 666         /* Let the cache function set errno if it wants to */
 667         errno = 0;
 668         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 669                                                 server, share,
 670                                                 *pp_workgroup,
 671                                                 *pp_username)) {
 672                 int saved_errno = errno;
 673                 DEBUG(3, (" Failed to add server to cache\n"));
 674                 errno = saved_errno;
 675                 if (errno == 0) {
 676                         errno = ENOMEM;
 677                 }
 678                 SAFE_FREE(srv);
 679                 return NULL;
 680         }
 681
 682         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 683                 server, share, srv));
 684
 685         DLIST_ADD(context->internal->servers, srv);
 686         return srv;
 687 }
 688
 689 /*
 690  * Connect to a server for getting/setting attributes, possibly on an existing
 691  * connection.  This works similarly to SMBC_server().
 692  */
 693 SMBCSRV *
 694 SMBC_attr_server(TALLOC_CTX *ctx,
 695                  SMBCCTX *context,
 696                  const char *server,
 697                  uint16_t port,
 698                  const char *share,
 699                  char **pp_workgroup,
 700                  char **pp_username,
 701                  char **pp_password)
 702 {
 703         int flags;
 704         struct cli_state *ipc_cli = NULL;
 705         struct rpc_pipe_client *pipe_hnd = NULL;
 706         NTSTATUS nt_status;
 707         SMBCSRV *srv=NULL;
 708         SMBCSRV *ipc_srv=NULL;
 709
 710         /*
 711          * Use srv->cli->desthost and srv->cli->share instead of
 712          * server and share below to connect to the actual share,
 713          * i.e., a normal share or a referred share from
 714          * 'msdfs proxy' share.
 715          */
 716         srv = SMBC_server(ctx, context, true, server, port, share,
 717                         pp_workgroup, pp_username, pp_password);
 718         if (!srv) {
 719                 return NULL;
 720         }
 721         server = smbXcli_conn_remote_name(srv->cli->conn);
 722         share = srv->cli->share;
 723
 724         /*
 725          * See if we've already created this special connection.  Reference
 726          * our "special" share name '*IPC$', which is an impossible real share
 727          * name due to the leading asterisk.
 728          */
 729         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 730                                    pp_workgroup, pp_username, pp_password);
 731         if (!ipc_srv) {
 732
 733                 /* We didn't find a cached connection.  Get the password */
 734                 if (!*pp_password || (*pp_password)[0] == '\0') {
 735                         /* ... then retrieve it now. */
 736                         SMBC_call_auth_fn(ctx, context, server, share,
 737                                           pp_workgroup,
 738                                           pp_username,
 739                                           pp_password);
 740                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 741                                 errno = ENOMEM;
 742                                 return NULL;
 743                         }
 744                 }
 745
 746                 flags = 0;
 747                 if (smbc_getOptionUseKerberos(context)) {
 748                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 749                 }
 750                 if (smbc_getOptionUseCCache(context)) {
 751                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 752                 }
 753
 754                 nt_status = cli_full_connection(&ipc_cli,
 755                                                 lp_netbios_name(), server,
 756                                                 NULL, 0, "IPC$", "?????",
 757                                                 *pp_username,
 758                                                 *pp_workgroup,
 759                                                 *pp_password,
 760                                                 flags,
 761                                                 SMB_SIGNING_DEFAULT);
 762                 if (! NT_STATUS_IS_OK(nt_status)) {
 763                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 764                                  nt_errstr(nt_status)));
 765                         errno = ENOTSUP;
 766                         return NULL;
 767                 }
 768
 769                 if (context->internal->smb_encryption_level) {
 770                         /* Attempt UNIX smb encryption. */
 771                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 772                                                                   *pp_username,
 773                                                                   *pp_password,
 774                                                                   *pp_workgroup))) {
 775
 776                                 /*
 777                                  * context->smb_encryption_level ==
 778                                  * 1 means don't fail if encryption can't be
 779                                  * negotiated, == 2 means fail if encryption
 780                                  * can't be negotiated.
 781                                  */
 782
 783                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 784
 785                                 if (context->internal->smb_encryption_level == 2) {
 786                                         cli_shutdown(ipc_cli);
 787                                         errno = EPERM;
 788                                         return NULL;
 789                                 }
 790                         }
 791                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 792                 }
 793
 794                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 795                 if (!ipc_srv) {
 796                         errno = ENOMEM;
 797                         cli_shutdown(ipc_cli);
 798                         return NULL;
 799                 }
 800
 801                 ZERO_STRUCTP(ipc_srv);
 802                 ipc_srv->cli = ipc_cli;
 803
 804                 nt_status = cli_rpc_pipe_open_noauth(
 805                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 806                 if (!NT_STATUS_IS_OK(nt_status)) {
 807                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 808                         errno = ENOTSUP;
 809                         cli_shutdown(ipc_srv->cli);
 810                         free(ipc_srv);
 811                         return NULL;
 812                 }
 813
 814                 /*
 815                  * Some systems don't support
 816                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 817                  * so we might as well do it too.
 818                  */
 819
 820                 nt_status = rpccli_lsa_open_policy(
 821                         pipe_hnd,
 822                         talloc_tos(),
 823                         True,
 824                         GENERIC_EXECUTE_ACCESS,
 825                         &ipc_srv->pol);
 826
 827                 if (!NT_STATUS_IS_OK(nt_status)) {
 828                         errno = SMBC_errno(context, ipc_srv->cli);
 829                         cli_shutdown(ipc_srv->cli);
 830                         free(ipc_srv);
 831                         return NULL;
 832                 }
 833
 834                 /* now add it to the cache (internal or external) */
 835
 836                 errno = 0;      /* let cache function set errno if it likes */
 837                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 838                                                              server,
 839                                                              "*IPC$",
 840                                                              *pp_workgroup,
 841                                                              *pp_username)) {
 842                         DEBUG(3, (" Failed to add server to cache\n"));
 843                         if (errno == 0) {
 844                                 errno = ENOMEM;
 845                         }
 846                         cli_shutdown(ipc_srv->cli);
 847                         free(ipc_srv);
 848                         return NULL;
 849                 }
 850
 851                 DLIST_ADD(context->internal->servers, ipc_srv);
 852         }
 853
 854         return ipc_srv;
 855 }