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
 260         ZERO_STRUCT(c);
 261         *in_cache = false;
 262
 263         if (server[0] == 0) {
 264                 errno = EPERM;
 265                 return NULL;
 266         }
 267
 268         /* Look for a cached connection */
 269         srv = SMBC_find_server(ctx, context, server, share,
 270                                pp_workgroup, pp_username, pp_password);
 271
 272         /*
 273          * If we found a connection and we're only allowed one share per
 274          * server...
 275          */
 276         if (srv &&
 277             share != NULL && *share != '\0' &&
 278             smbc_getOptionOneSharePerServer(context)) {
 279
 280                 /*
 281                  * ... then if there's no current connection to the share,
 282                  * connect to it.  SMBC_find_server(), or rather the function
 283                  * pointed to by context->get_cached_srv_fn which
 284                  * was called by SMBC_find_server(), will have issued a tree
 285                  * disconnect if the requested share is not the same as the
 286                  * one that was already connected.
 287                  */
 288
 289                 /*
 290                  * Use srv->cli->desthost and srv->cli->share instead of
 291                  * server and share below to connect to the actual share,
 292                  * i.e., a normal share or a referred share from
 293                  * 'msdfs proxy' share.
 294                  */
 295                 if (!cli_state_has_tcon(srv->cli)) {
 296                         /* Ensure we have accurate auth info */
 297                         SMBC_call_auth_fn(ctx, context,
 298                                           smbXcli_conn_remote_name(srv->cli->conn),
 299                                           srv->cli->share,
 300                                           pp_workgroup,
 301                                           pp_username,
 302                                           pp_password);
 303
 304                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 305                                 errno = ENOMEM;
 306                                 cli_shutdown(srv->cli);
 307                                 srv->cli = NULL;
 308                                 smbc_getFunctionRemoveCachedServer(context)(context,
 309                                                                             srv);
 310                                 return NULL;
 311                         }
 312
 313                         /*
 314                          * We don't need to renegotiate encryption
 315                          * here as the encryption context is not per
 316                          * tid.
 317                          */
 318
 319                         status = cli_tree_connect(srv->cli,
 320                                                   srv->cli->share,
 321                                                   "?????",
 322                                                   *pp_password,
 323                                                   strlen(*pp_password)+1);
 324                         if (!NT_STATUS_IS_OK(status)) {
 325                                 errno = map_errno_from_nt_status(status);
 326                                 cli_shutdown(srv->cli);
 327                                 srv->cli = NULL;
 328                                 smbc_getFunctionRemoveCachedServer(context)(context,
 329                                                                             srv);
 330                                 srv = NULL;
 331                         }
 332
 333                         /* Determine if this share supports case sensitivity */
 334                         if (is_ipc) {
 335                                 DEBUG(4,
 336                                       ("IPC$ so ignore case sensitivity\n"));
 337                                 status = NT_STATUS_OK;
 338                         } else {
 339                                 status = cli_get_fs_attr_info(c, &fs_attrs);
 340                         }
 341
 342                         if (!NT_STATUS_IS_OK(status)) {
 343                                 DEBUG(4, ("Could not retrieve "
 344                                           "case sensitivity flag: %s.\n",
 345                                           nt_errstr(status)));
 346
 347                                 /*
 348                                  * We can't determine the case sensitivity of
 349                                  * the share. We have no choice but to use the
 350                                  * user-specified case sensitivity setting.
 351                                  */
 352                                 if (smbc_getOptionCaseSensitive(context)) {
 353                                         cli_set_case_sensitive(c, True);
 354                                 } else {
 355                                         cli_set_case_sensitive(c, False);
 356                                 }
 357                         } else if (!is_ipc) {
 358                                 DEBUG(4,
 359                                       ("Case sensitive: %s\n",
 360                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 361                                         ? "True"
 362                                         : "False")));
 363                                 cli_set_case_sensitive(
 364                                         c,
 365                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 366                                          ? True
 367                                          : False));
 368                         }
 369
 370                         /*
 371                          * Regenerate the dev value since it's based on both
 372                          * server and share
 373                          */
 374                         if (srv) {
 375                                 const char *remote_name =
 376                                         smbXcli_conn_remote_name(srv->cli->conn);
 377
 378                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 379                                                    str_checksum(srv->cli->share));
 380                         }
 381                 }
 382         }
 383
 384         /* If we have a connection... */
 385         if (srv) {
 386
 387                 /* ... then we're done here.  Give 'em what they came for. */
 388                 *in_cache = true;
 389                 goto done;
 390         }
 391
 392         /* If we're not asked to connect when a connection doesn't exist... */
 393         if (! connect_if_not_found) {
 394                 /* ... then we're done here. */
 395                 return NULL;
 396         }
 397
 398         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 399                 errno = ENOMEM;
 400                 return NULL;
 401         }
 402
 403         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 404
 405         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 406
 407         status = NT_STATUS_UNSUCCESSFUL;
 408
 409         if (smbc_getOptionUseKerberos(context)) {
 410                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 411         }
 412
 413         if (smbc_getOptionFallbackAfterKerberos(context)) {
 414                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 415         }
 416
 417         if (smbc_getOptionUseCCache(context)) {
 418                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 419         }
 420
 421         if (smbc_getOptionUseNTHash(context)) {
 422                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 423         }
 424
 425         if (port == 0) {
 426                 if (share == NULL || *share == '\0' || is_ipc) {
 427                         /*
 428                          * Try 139 first for IPC$
 429                          */
 430                         status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 431                                         smbc_getNetbiosName(context),
 432                                         SMB_SIGNING_DEFAULT, flags, &c);
 433                 }
 434         }
 435
 436         if (!NT_STATUS_IS_OK(status)) {
 437                 /*
 438                  * No IPC$ or 139 did not work
 439                  */
 440                 status = cli_connect_nb(server_n, NULL, port, 0x20,
 441                                         smbc_getNetbiosName(context),
 442                                         SMB_SIGNING_DEFAULT, flags, &c);
 443         }
 444
 445         if (!NT_STATUS_IS_OK(status)) {
 446                 errno = map_errno_from_nt_status(status);
 447                 return NULL;
 448         }
 449
 450         cli_set_timeout(c, smbc_getTimeout(context));
 451
 452         status = smbXcli_negprot(c->conn, c->timeout,
 453                                  lp_cli_minprotocol(),
 454                                  lp_cli_maxprotocol());
 455         if (!NT_STATUS_IS_OK(status)) {
 456                 cli_shutdown(c);
 457                 errno = ETIMEDOUT;
 458                 return NULL;
 459         }
 460
 461         username_used = *pp_username;
 462
 463         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 464                                                *pp_password,
 465                                                strlen(*pp_password),
 466                                                *pp_password,
 467                                                strlen(*pp_password),
 468                                                *pp_workgroup))) {
 469
 470                 /* Failed.  Try an anonymous login, if allowed by flags. */
 471                 username_used = "";
 472
 473                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 474                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 475                                                        *pp_password, 1,
 476                                                        *pp_password, 0,
 477                                                        *pp_workgroup))) {
 478
 479                         cli_shutdown(c);
 480                         errno = EPERM;
 481                         return NULL;
 482                 }
 483         }
 484
 485         status = cli_init_creds(c, username_used,
 486                                 *pp_workgroup, *pp_password);
 487         if (!NT_STATUS_IS_OK(status)) {
 488                 errno = map_errno_from_nt_status(status);
 489                 cli_shutdown(c);
 490                 return NULL;
 491         }
 492
 493         DEBUG(4,(" session setup ok\n"));
 494
 495         /* here's the fun part....to support 'msdfs proxy' shares
 496            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 497            here before trying to connect to the original share.
 498            cli_check_msdfs_proxy() will fail if it is a normal share. */
 499
 500         if (smbXcli_conn_dfs_supported(c->conn) &&
 501                         cli_check_msdfs_proxy(ctx, c, share,
 502                                 &newserver, &newshare,
 503                                 /* FIXME: cli_check_msdfs_proxy() does
 504                                    not support smbc_smb_encrypt_level type */
 505                                 context->internal->smb_encryption_level ?
 506                                         true : false,
 507                                 *pp_username,
 508                                 *pp_password,
 509                                 *pp_workgroup)) {
 510                 cli_shutdown(c);
 511                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 512                                 newserver, port, newshare, pp_workgroup,
 513                                 pp_username, pp_password, in_cache);
 514                 TALLOC_FREE(newserver);
 515                 TALLOC_FREE(newshare);
 516                 return srv;
 517         }
 518
 519         /* must be a normal share */
 520
 521         status = cli_tree_connect(c, share, "?????", *pp_password,
 522                                   strlen(*pp_password)+1);
 523         if (!NT_STATUS_IS_OK(status)) {
 524                 errno = map_errno_from_nt_status(status);
 525                 cli_shutdown(c);
 526                 return NULL;
 527         }
 528
 529         DEBUG(4,(" tconx ok\n"));
 530
 531         /* Determine if this share supports case sensitivity */
 532         if (is_ipc) {
 533                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 534                 status = NT_STATUS_OK;
 535         } else {
 536                 status = cli_get_fs_attr_info(c, &fs_attrs);
 537         }
 538
 539         if (!NT_STATUS_IS_OK(status)) {
 540                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 541                           nt_errstr(status)));
 542
 543                 /*
 544                  * We can't determine the case sensitivity of the share. We
 545                  * have no choice but to use the user-specified case
 546                  * sensitivity setting.
 547                  */
 548                 if (smbc_getOptionCaseSensitive(context)) {
 549                         cli_set_case_sensitive(c, True);
 550                 } else {
 551                         cli_set_case_sensitive(c, False);
 552                 }
 553         } else if (!is_ipc) {
 554                 DEBUG(4, ("Case sensitive: %s\n",
 555                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 556                            ? "True"
 557                            : "False")));
 558                 cli_set_case_sensitive(c,
 559                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 560                                         ? True
 561                                         : False));
 562         }
 563
 564         if (context->internal->smb_encryption_level) {
 565                 /* Attempt UNIX smb encryption. */
 566                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 567                                                           username_used,
 568                                                           *pp_password,
 569                                                           *pp_workgroup))) {
 570
 571                         /*
 572                          * context->smb_encryption_level == 1
 573                          * means don't fail if encryption can't be negotiated,
 574                          * == 2 means fail if encryption can't be negotiated.
 575                          */
 576
 577                         DEBUG(4,(" SMB encrypt failed\n"));
 578
 579                         if (context->internal->smb_encryption_level == 2) {
 580                                 cli_shutdown(c);
 581                                 errno = EPERM;
 582                                 return NULL;
 583                         }
 584                 }
 585                 DEBUG(4,(" SMB encrypt ok\n"));
 586         }
 587
 588         /*
 589          * Ok, we have got a nice connection
 590          * Let's allocate a server structure.
 591          */
 592
 593         srv = SMB_MALLOC_P(SMBCSRV);
 594         if (!srv) {
 595                 cli_shutdown(c);
 596                 errno = ENOMEM;
 597                 return NULL;
 598         }
 599
 600         ZERO_STRUCTP(srv);
 601         srv->cli = c;
 602         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 603         srv->no_pathinfo = False;
 604         srv->no_pathinfo2 = False;
 605         srv->no_nt_session = False;
 606
 607 done:
 608         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 609                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 610         } else {
 611                 workgroup = *pp_workgroup;
 612         }
 613         if(!workgroup) {
 614                 if (c != NULL) {
 615                         cli_shutdown(c);
 616                 }
 617                 SAFE_FREE(srv);
 618                 return NULL;
 619         }
 620
 621         /* set the credentials to make DFS work */
 622         smbc_set_credentials_with_fallback(context,
 623                                            workgroup,
 624                                            *pp_username,
 625                                            *pp_password);
 626
 627         return srv;
 628 }
 629
 630 SMBCSRV *
 631 SMBC_server(TALLOC_CTX *ctx,
 632                 SMBCCTX *context,
 633                 bool connect_if_not_found,
 634                 const char *server,
 635                 uint16_t port,
 636                 const char *share,
 637                 char **pp_workgroup,
 638                 char **pp_username,
 639                 char **pp_password)
 640 {
 641         SMBCSRV *srv=NULL;
 642         bool in_cache = false;
 643
 644         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 645                         server, port, share, pp_workgroup,
 646                         pp_username, pp_password, &in_cache);
 647
 648         if (!srv) {
 649                 return NULL;
 650         }
 651         if (in_cache) {
 652                 return srv;
 653         }
 654
 655         /* Now add it to the cache (internal or external)  */
 656         /* Let the cache function set errno if it wants to */
 657         errno = 0;
 658         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 659                                                 server, share,
 660                                                 *pp_workgroup,
 661                                                 *pp_username)) {
 662                 int saved_errno = errno;
 663                 DEBUG(3, (" Failed to add server to cache\n"));
 664                 errno = saved_errno;
 665                 if (errno == 0) {
 666                         errno = ENOMEM;
 667                 }
 668                 SAFE_FREE(srv);
 669                 return NULL;
 670         }
 671
 672         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 673                 server, share, srv));
 674
 675         DLIST_ADD(context->internal->servers, srv);
 676         return srv;
 677 }
 678
 679 /*
 680  * Connect to a server for getting/setting attributes, possibly on an existing
 681  * connection.  This works similarly to SMBC_server().
 682  */
 683 SMBCSRV *
 684 SMBC_attr_server(TALLOC_CTX *ctx,
 685                  SMBCCTX *context,
 686                  const char *server,
 687                  uint16_t port,
 688                  const char *share,
 689                  char **pp_workgroup,
 690                  char **pp_username,
 691                  char **pp_password)
 692 {
 693         int flags;
 694         struct cli_state *ipc_cli = NULL;
 695         struct rpc_pipe_client *pipe_hnd = NULL;
 696         NTSTATUS nt_status;
 697         SMBCSRV *srv=NULL;
 698         SMBCSRV *ipc_srv=NULL;
 699
 700         /*
 701          * Use srv->cli->desthost and srv->cli->share instead of
 702          * server and share below to connect to the actual share,
 703          * i.e., a normal share or a referred share from
 704          * 'msdfs proxy' share.
 705          */
 706         srv = SMBC_server(ctx, context, true, server, port, share,
 707                         pp_workgroup, pp_username, pp_password);
 708         if (!srv) {
 709                 return NULL;
 710         }
 711         server = smbXcli_conn_remote_name(srv->cli->conn);
 712         share = srv->cli->share;
 713
 714         /*
 715          * See if we've already created this special connection.  Reference
 716          * our "special" share name '*IPC$', which is an impossible real share
 717          * name due to the leading asterisk.
 718          */
 719         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 720                                    pp_workgroup, pp_username, pp_password);
 721         if (!ipc_srv) {
 722
 723                 /* We didn't find a cached connection.  Get the password */
 724                 if (!*pp_password || (*pp_password)[0] == '\0') {
 725                         /* ... then retrieve it now. */
 726                         SMBC_call_auth_fn(ctx, context, server, share,
 727                                           pp_workgroup,
 728                                           pp_username,
 729                                           pp_password);
 730                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 731                                 errno = ENOMEM;
 732                                 return NULL;
 733                         }
 734                 }
 735
 736                 flags = 0;
 737                 if (smbc_getOptionUseKerberos(context)) {
 738                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 739                 }
 740                 if (smbc_getOptionUseCCache(context)) {
 741                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 742                 }
 743
 744                 nt_status = cli_full_connection(&ipc_cli,
 745                                                 lp_netbios_name(), server,
 746                                                 NULL, 0, "IPC$", "?????",
 747                                                 *pp_username,
 748                                                 *pp_workgroup,
 749                                                 *pp_password,
 750                                                 flags,
 751                                                 SMB_SIGNING_DEFAULT);
 752                 if (! NT_STATUS_IS_OK(nt_status)) {
 753                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 754                                  nt_errstr(nt_status)));
 755                         errno = ENOTSUP;
 756                         return NULL;
 757                 }
 758
 759                 if (context->internal->smb_encryption_level) {
 760                         /* Attempt UNIX smb encryption. */
 761                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 762                                                                   *pp_username,
 763                                                                   *pp_password,
 764                                                                   *pp_workgroup))) {
 765
 766                                 /*
 767                                  * context->smb_encryption_level ==
 768                                  * 1 means don't fail if encryption can't be
 769                                  * negotiated, == 2 means fail if encryption
 770                                  * can't be negotiated.
 771                                  */
 772
 773                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 774
 775                                 if (context->internal->smb_encryption_level == 2) {
 776                                         cli_shutdown(ipc_cli);
 777                                         errno = EPERM;
 778                                         return NULL;
 779                                 }
 780                         }
 781                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 782                 }
 783
 784                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 785                 if (!ipc_srv) {
 786                         errno = ENOMEM;
 787                         cli_shutdown(ipc_cli);
 788                         return NULL;
 789                 }
 790
 791                 ZERO_STRUCTP(ipc_srv);
 792                 ipc_srv->cli = ipc_cli;
 793
 794                 nt_status = cli_rpc_pipe_open_noauth(
 795                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 796                 if (!NT_STATUS_IS_OK(nt_status)) {
 797                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 798                         errno = ENOTSUP;
 799                         cli_shutdown(ipc_srv->cli);
 800                         free(ipc_srv);
 801                         return NULL;
 802                 }
 803
 804                 /*
 805                  * Some systems don't support
 806                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 807                  * so we might as well do it too.
 808                  */
 809
 810                 nt_status = rpccli_lsa_open_policy(
 811                         pipe_hnd,
 812                         talloc_tos(),
 813                         True,
 814                         GENERIC_EXECUTE_ACCESS,
 815                         &ipc_srv->pol);
 816
 817                 if (!NT_STATUS_IS_OK(nt_status)) {
 818                         errno = SMBC_errno(context, ipc_srv->cli);
 819                         cli_shutdown(ipc_srv->cli);
 820                         free(ipc_srv);
 821                         return NULL;
 822                 }
 823
 824                 /* now add it to the cache (internal or external) */
 825
 826                 errno = 0;      /* let cache function set errno if it likes */
 827                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 828                                                              server,
 829                                                              "*IPC$",
 830                                                              *pp_workgroup,
 831                                                              *pp_username)) {
 832                         DEBUG(3, (" Failed to add server to cache\n"));
 833                         if (errno == 0) {
 834                                 errno = ENOMEM;
 835                         }
 836                         cli_shutdown(ipc_srv->cli);
 837                         free(ipc_srv);
 838                         return NULL;
 839                 }
 840
 841                 DLIST_ADD(context->internal->servers, ipc_srv);
 842         }
 843
 844         return ipc_srv;
 845 }