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 "libsmbclient.h"
  28 #include "libsmb_internal.h"
  29 #include "../librpc/gen_ndr/ndr_lsa.h"
  30 #include "rpc_client/cli_pipe.h"
  31 #include "rpc_client/cli_lsarpc.h"
  32 #include "libcli/security/security.h"
  33 #include "libsmb/nmblib.h"
  34
  35 /*
  36  * Check a server for being alive and well.
  37  * returns 0 if the server is in shape. Returns 1 on error
  38  *
  39  * Also useable outside libsmbclient to enable external cache
  40  * to do some checks too.
  41  */
  42 int
  43 SMBC_check_server(SMBCCTX * context,
  44                   SMBCSRV * server)
  45 {
  46         socklen_t size;
  47         struct sockaddr addr;
  48
  49         size = sizeof(addr);
  50         return (getpeername(server->cli->fd, &addr, &size) == -1);
  51 }
  52
  53 /*
  54  * Remove a server from the cached server list it's unused.
  55  * On success, 0 is returned. 1 is returned if the server could not be removed.
  56  *
  57  * Also useable outside libsmbclient
  58  */
  59 int
  60 SMBC_remove_unused_server(SMBCCTX * context,
  61                           SMBCSRV * srv)
  62 {
  63         SMBCFILE * file;
  64
  65         /* are we being fooled ? */
  66         if (!context || !context->internal->initialized || !srv) {
  67                 return 1;
  68         }
  69
  70         /* Check all open files/directories for a relation with this server */
  71         for (file = context->internal->files; file; file = file->next) {
  72                 if (file->srv == srv) {
  73                         /* Still used */
  74                         DEBUG(3, ("smbc_remove_usused_server: "
  75                                   "%p still used by %p.\n",
  76                                   srv, file));
  77                         return 1;
  78                 }
  79         }
  80
  81         DLIST_REMOVE(context->internal->servers, srv);
  82
  83         cli_shutdown(srv->cli);
  84         srv->cli = NULL;
  85
  86         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  87
  88         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  89
  90         SAFE_FREE(srv);
  91         return 0;
  92 }
  93
  94 /****************************************************************
  95  * Call the auth_fn with fixed size (fstring) buffers.
  96  ***************************************************************/
  97 void
  98 SMBC_call_auth_fn(TALLOC_CTX *ctx,
  99                   SMBCCTX *context,
 100                   const char *server,
 101                   const char *share,
 102                   char **pp_workgroup,
 103                   char **pp_username,
 104                   char **pp_password)
 105 {
 106         fstring workgroup;
 107         fstring username;
 108         fstring password;
 109         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 110
 111         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 112         strlcpy(username, *pp_username, sizeof(username));
 113         strlcpy(password, *pp_password, sizeof(password));
 114
 115         /* See if there's an authentication with context function provided */
 116         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 117         if (auth_with_context_fn)
 118         {
 119             (* auth_with_context_fn)(context,
 120                                      server, share,
 121                                      workgroup, sizeof(workgroup),
 122                                      username, sizeof(username),
 123                                      password, sizeof(password));
 124         }
 125         else
 126         {
 127             smbc_getFunctionAuthData(context)(server, share,
 128                                               workgroup, sizeof(workgroup),
 129                                               username, sizeof(username),
 130                                               password, sizeof(password));
 131         }
 132
 133         TALLOC_FREE(*pp_workgroup);
 134         TALLOC_FREE(*pp_username);
 135         TALLOC_FREE(*pp_password);
 136
 137         *pp_workgroup = talloc_strdup(ctx, workgroup);
 138         *pp_username = talloc_strdup(ctx, username);
 139         *pp_password = talloc_strdup(ctx, password);
 140 }
 141
 142
 143 void
 144 SMBC_get_auth_data(const char *server, const char *share,
 145                    char *workgroup_buf, int workgroup_buf_len,
 146                    char *username_buf, int username_buf_len,
 147                    char *password_buf, int password_buf_len)
 148 {
 149         /* Default function just uses provided data.  Nothing to do. */
 150 }
 151
 152
 153
 154 SMBCSRV *
 155 SMBC_find_server(TALLOC_CTX *ctx,
 156                  SMBCCTX *context,
 157                  const char *server,
 158                  const char *share,
 159                  char **pp_workgroup,
 160                  char **pp_username,
 161                  char **pp_password)
 162 {
 163         SMBCSRV *srv;
 164         int auth_called = 0;
 165
 166         if (!pp_workgroup || !pp_username || !pp_password) {
 167                 return NULL;
 168         }
 169
 170 check_server_cache:
 171
 172         srv = smbc_getFunctionGetCachedServer(context)(context,
 173                                                        server, share,
 174                                                        *pp_workgroup,
 175                                                        *pp_username);
 176
 177         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 178                                      !*pp_password || !(*pp_password)[0])) {
 179                 SMBC_call_auth_fn(ctx, context, server, share,
 180                                   pp_workgroup, pp_username, pp_password);
 181
 182                 /*
 183                  * However, smbc_auth_fn may have picked up info relating to
 184                  * an existing connection, so try for an existing connection
 185                  * again ...
 186                  */
 187                 auth_called = 1;
 188                 goto check_server_cache;
 189
 190         }
 191
 192         if (srv) {
 193                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 194                         /*
 195                          * This server is no good anymore
 196                          * Try to remove it and check for more possible
 197                          * servers in the cache
 198                          */
 199                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 200                                                                         srv)) {
 201                                 /*
 202                                  * We could not remove the server completely,
 203                                  * remove it from the cache so we will not get
 204                                  * it again. It will be removed when the last
 205                                  * file/dir is closed.
 206                                  */
 207                                 smbc_getFunctionRemoveCachedServer(context)(context,
 208                                                                             srv);
 209                         }
 210
 211                         /*
 212                          * Maybe there are more cached connections to this
 213                          * server
 214                          */
 215                         goto check_server_cache;
 216                 }
 217
 218                 return srv;
 219         }
 220
 221         return NULL;
 222 }
 223
 224 /*
 225  * Connect to a server, possibly on an existing connection
 226  *
 227  * Here, what we want to do is: If the server and username
 228  * match an existing connection, reuse that, otherwise, establish a
 229  * new connection.
 230  *
 231  * If we have to create a new connection, call the auth_fn to get the
 232  * info we need, unless the username and password were passed in.
 233  */
 234
 235 static SMBCSRV *
 236 SMBC_server_internal(TALLOC_CTX *ctx,
 237             SMBCCTX *context,
 238             bool connect_if_not_found,
 239             const char *server,
 240             const char *share,
 241             char **pp_workgroup,
 242             char **pp_username,
 243             char **pp_password,
 244             bool *in_cache)
 245 {
 246         SMBCSRV *srv=NULL;
 247         char *workgroup = NULL;
 248         struct cli_state *c;
 249         struct nmb_name called, calling;
 250         const char *server_n = server;
 251         struct sockaddr_storage ss;
 252         int tried_reverse = 0;
 253         int port_try_first;
 254         int port_try_next;
 255         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 256         uint32 fs_attrs = 0;
 257         const char *username_used;
 258         NTSTATUS status;
 259         char *newserver, *newshare;
 260
 261         zero_sockaddr(&ss);
 262         ZERO_STRUCT(c);
 263         *in_cache = false;
 264
 265         if (server[0] == 0) {
 266                 errno = EPERM;
 267                 return NULL;
 268         }
 269
 270         /* Look for a cached connection */
 271         srv = SMBC_find_server(ctx, context, server, share,
 272                                pp_workgroup, pp_username, pp_password);
 273
 274         /*
 275          * If we found a connection and we're only allowed one share per
 276          * server...
 277          */
 278         if (srv &&
 279             *share != '\0' &&
 280             smbc_getOptionOneSharePerServer(context)) {
 281
 282                 /*
 283                  * ... then if there's no current connection to the share,
 284                  * connect to it.  SMBC_find_server(), or rather the function
 285                  * pointed to by context->get_cached_srv_fn which
 286                  * was called by SMBC_find_server(), will have issued a tree
 287                  * disconnect if the requested share is not the same as the
 288                  * one that was already connected.
 289                  */
 290
 291                 /*
 292                  * Use srv->cli->desthost and srv->cli->share instead of
 293                  * server and share below to connect to the actual share,
 294                  * i.e., a normal share or a referred share from
 295                  * 'msdfs proxy' share.
 296                  */
 297                 if (srv->cli->cnum == (uint16) -1) {
 298                         /* Ensure we have accurate auth info */
 299                         SMBC_call_auth_fn(ctx, context,
 300                                           srv->cli->desthost,
 301                                           srv->cli->share,
 302                                           pp_workgroup,
 303                                           pp_username,
 304                                           pp_password);
 305
 306                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 307                                 errno = ENOMEM;
 308                                 cli_shutdown(srv->cli);
 309                                 srv->cli = NULL;
 310                                 smbc_getFunctionRemoveCachedServer(context)(context,
 311                                                                             srv);
 312                                 return NULL;
 313                         }
 314
 315                         /*
 316                          * We don't need to renegotiate encryption
 317                          * here as the encryption context is not per
 318                          * tid.
 319                          */
 320
 321                         status = cli_tcon_andx(srv->cli, srv->cli->share, "?????",
 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                         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 338                                 DEBUG(4, ("Could not retrieve "
 339                                           "case sensitivity flag: %s.\n",
 340                                           cli_errstr(c)));
 341
 342                                 /*
 343                                  * We can't determine the case sensitivity of
 344                                  * the share. We have no choice but to use the
 345                                  * user-specified case sensitivity setting.
 346                                  */
 347                                 if (smbc_getOptionCaseSensitive(context)) {
 348                                         cli_set_case_sensitive(c, True);
 349                                 } else {
 350                                         cli_set_case_sensitive(c, False);
 351                                 }
 352                         } else {
 353                                 DEBUG(4,
 354                                       ("Case sensitive: %s\n",
 355                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 356                                         ? "True"
 357                                         : "False")));
 358                                 cli_set_case_sensitive(
 359                                         c,
 360                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 361                                          ? True
 362                                          : False));
 363                         }
 364
 365                         /*
 366                          * Regenerate the dev value since it's based on both
 367                          * server and share
 368                          */
 369                         if (srv) {
 370                                 srv->dev = (dev_t)(str_checksum(srv->cli->desthost) ^
 371                                                    str_checksum(srv->cli->share));
 372                         }
 373                 }
 374         }
 375
 376         /* If we have a connection... */
 377         if (srv) {
 378
 379                 /* ... then we're done here.  Give 'em what they came for. */
 380                 *in_cache = true;
 381                 goto done;
 382         }
 383
 384         /* If we're not asked to connect when a connection doesn't exist... */
 385         if (! connect_if_not_found) {
 386                 /* ... then we're done here. */
 387                 return NULL;
 388         }
 389
 390         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 391                 errno = ENOMEM;
 392                 return NULL;
 393         }
 394
 395         make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
 396         make_nmb_name(&called , server, 0x20);
 397
 398         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 399
 400         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 401
 402 again:
 403
 404         zero_sockaddr(&ss);
 405
 406         /* have to open a new connection */
 407         if ((c = cli_initialise()) == NULL) {
 408                 errno = ENOMEM;
 409                 return NULL;
 410         }
 411
 412         if (smbc_getOptionUseKerberos(context)) {
 413                 c->use_kerberos = True;
 414         }
 415
 416         if (smbc_getOptionFallbackAfterKerberos(context)) {
 417                 c->fallback_after_kerberos = True;
 418         }
 419
 420         if (smbc_getOptionUseCCache(context)) {
 421                 c->use_ccache = True;
 422         }
 423
 424         c->timeout = smbc_getTimeout(context);
 425
 426         /*
 427          * Force use of port 139 for first try if share is $IPC, empty, or
 428          * null, so browse lists can work
 429          */
 430         if (share == NULL || *share == '\0' || is_ipc) {
 431                 port_try_first = 139;
 432                 port_try_next = 445;
 433         } else {
 434                 port_try_first = 445;
 435                 port_try_next = 139;
 436         }
 437
 438         c->port = port_try_first;
 439
 440         status = cli_connect(c, server_n, &ss);
 441         if (!NT_STATUS_IS_OK(status)) {
 442
 443                 /* First connection attempt failed.  Try alternate port. */
 444                 c->port = port_try_next;
 445
 446                 status = cli_connect(c, server_n, &ss);
 447                 if (!NT_STATUS_IS_OK(status)) {
 448                         cli_shutdown(c);
 449                         errno = ETIMEDOUT;
 450                         return NULL;
 451                 }
 452         }
 453
 454         if (!cli_session_request(c, &calling, &called)) {
 455                 cli_shutdown(c);
 456                 if (strcmp(called.name, "*SMBSERVER")) {
 457                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 458                         goto again;
 459                 } else {  /* Try one more time, but ensure we don't loop */
 460
 461                         /* Only try this if server is an IP address ... */
 462
 463                         if (is_ipaddress(server) && !tried_reverse) {
 464                                 fstring remote_name;
 465                                 struct sockaddr_storage rem_ss;
 466
 467                                 if (!interpret_string_addr(&rem_ss, server,
 468                                                            NI_NUMERICHOST)) {
 469                                         DEBUG(4, ("Could not convert IP address "
 470                                                   "%s to struct sockaddr_storage\n",
 471                                                   server));
 472                                         errno = ETIMEDOUT;
 473                                         return NULL;
 474                                 }
 475
 476                                 tried_reverse++; /* Yuck */
 477
 478                                 if (name_status_find("*", 0, 0,
 479                                                      &rem_ss, remote_name)) {
 480                                         make_nmb_name(&called,
 481                                                       remote_name,
 482                                                       0x20);
 483                                         goto again;
 484                                 }
 485                         }
 486                 }
 487                 errno = ETIMEDOUT;
 488                 return NULL;
 489         }
 490
 491         DEBUG(4,(" session request ok\n"));
 492
 493         status = cli_negprot(c);
 494
 495         if (!NT_STATUS_IS_OK(status)) {
 496                 cli_shutdown(c);
 497                 errno = ETIMEDOUT;
 498                 return NULL;
 499         }
 500
 501         username_used = *pp_username;
 502
 503         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 504                                                *pp_password,
 505                                                strlen(*pp_password),
 506                                                *pp_password,
 507                                                strlen(*pp_password),
 508                                                *pp_workgroup))) {
 509
 510                 /* Failed.  Try an anonymous login, if allowed by flags. */
 511                 username_used = "";
 512
 513                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 514                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 515                                                        *pp_password, 1,
 516                                                        *pp_password, 0,
 517                                                        *pp_workgroup))) {
 518
 519                         cli_shutdown(c);
 520                         errno = EPERM;
 521                         return NULL;
 522                 }
 523         }
 524
 525         status = cli_init_creds(c, username_used,
 526                                 *pp_workgroup, *pp_password);
 527         if (!NT_STATUS_IS_OK(status)) {
 528                 errno = map_errno_from_nt_status(status);
 529                 cli_shutdown(c);
 530                 return NULL;
 531         }
 532
 533         DEBUG(4,(" session setup ok\n"));
 534
 535         /* here's the fun part....to support 'msdfs proxy' shares
 536            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 537            here before trying to connect to the original share.
 538            cli_check_msdfs_proxy() will fail if it is a normal share. */
 539
 540         if ((c->capabilities & CAP_DFS) &&
 541                         cli_check_msdfs_proxy(ctx, c, share,
 542                                 &newserver, &newshare,
 543                                 /* FIXME: cli_check_msdfs_proxy() does
 544                                    not support smbc_smb_encrypt_level type */
 545                                 context->internal->smb_encryption_level ?
 546                                         true : false,
 547                                 *pp_username,
 548                                 *pp_password,
 549                                 *pp_workgroup)) {
 550                 cli_shutdown(c);
 551                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 552                                 newserver, newshare, pp_workgroup,
 553                                 pp_username, pp_password, in_cache);
 554                 TALLOC_FREE(newserver);
 555                 TALLOC_FREE(newshare);
 556                 return srv;
 557         }
 558
 559         /* must be a normal share */
 560
 561         status = cli_tcon_andx(c, share, "?????", *pp_password,
 562                                strlen(*pp_password)+1);
 563         if (!NT_STATUS_IS_OK(status)) {
 564                 errno = map_errno_from_nt_status(status);
 565                 cli_shutdown(c);
 566                 return NULL;
 567         }
 568
 569         DEBUG(4,(" tconx ok\n"));
 570
 571         /* Determine if this share supports case sensitivity */
 572         if (is_ipc) {
 573                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 574         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 575                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 576                           cli_errstr(c)));
 577
 578                 /*
 579                  * We can't determine the case sensitivity of the share. We
 580                  * have no choice but to use the user-specified case
 581                  * sensitivity setting.
 582                  */
 583                 if (smbc_getOptionCaseSensitive(context)) {
 584                         cli_set_case_sensitive(c, True);
 585                 } else {
 586                         cli_set_case_sensitive(c, False);
 587                 }
 588         } else {
 589                 DEBUG(4, ("Case sensitive: %s\n",
 590                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 591                            ? "True"
 592                            : "False")));
 593                 cli_set_case_sensitive(c,
 594                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 595                                         ? True
 596                                         : False));
 597         }
 598
 599         if (context->internal->smb_encryption_level) {
 600                 /* Attempt UNIX smb encryption. */
 601                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 602                                                           username_used,
 603                                                           *pp_password,
 604                                                           *pp_workgroup))) {
 605
 606                         /*
 607                          * context->smb_encryption_level == 1
 608                          * means don't fail if encryption can't be negotiated,
 609                          * == 2 means fail if encryption can't be negotiated.
 610                          */
 611
 612                         DEBUG(4,(" SMB encrypt failed\n"));
 613
 614                         if (context->internal->smb_encryption_level == 2) {
 615                                 cli_shutdown(c);
 616                                 errno = EPERM;
 617                                 return NULL;
 618                         }
 619                 }
 620                 DEBUG(4,(" SMB encrypt ok\n"));
 621         }
 622
 623         /*
 624          * Ok, we have got a nice connection
 625          * Let's allocate a server structure.
 626          */
 627
 628         srv = SMB_MALLOC_P(SMBCSRV);
 629         if (!srv) {
 630                 cli_shutdown(c);
 631                 errno = ENOMEM;
 632                 return NULL;
 633         }
 634
 635         ZERO_STRUCTP(srv);
 636         srv->cli = c;
 637         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 638         srv->no_pathinfo = False;
 639         srv->no_pathinfo2 = False;
 640         srv->no_nt_session = False;
 641
 642 done:
 643         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 644                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 645         } else {
 646                 workgroup = *pp_workgroup;
 647         }
 648         if(!workgroup) {
 649                 return NULL;
 650         }
 651
 652         /* set the credentials to make DFS work */
 653         smbc_set_credentials_with_fallback(context,
 654                                            workgroup,
 655                                            *pp_username,
 656                                            *pp_password);
 657
 658         return srv;
 659 }
 660
 661 SMBCSRV *
 662 SMBC_server(TALLOC_CTX *ctx,
 663                 SMBCCTX *context,
 664                 bool connect_if_not_found,
 665                 const char *server,
 666                 const char *share,
 667                 char **pp_workgroup,
 668                 char **pp_username,
 669                 char **pp_password)
 670 {
 671         SMBCSRV *srv=NULL;
 672         bool in_cache = false;
 673
 674         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 675                         server, share, pp_workgroup,
 676                         pp_username, pp_password, &in_cache);
 677
 678         if (!srv) {
 679                 return NULL;
 680         }
 681         if (in_cache) {
 682                 return srv;
 683         }
 684
 685         /* Now add it to the cache (internal or external)  */
 686         /* Let the cache function set errno if it wants to */
 687         errno = 0;
 688         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 689                                                 server, share,
 690                                                 *pp_workgroup,
 691                                                 *pp_username)) {
 692                 int saved_errno = errno;
 693                 DEBUG(3, (" Failed to add server to cache\n"));
 694                 errno = saved_errno;
 695                 if (errno == 0) {
 696                         errno = ENOMEM;
 697                 }
 698                 SAFE_FREE(srv);
 699                 return NULL;
 700         }
 701
 702         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 703                 server, share, srv));
 704
 705         DLIST_ADD(context->internal->servers, srv);
 706         return srv;
 707 }
 708
 709 /*
 710  * Connect to a server for getting/setting attributes, possibly on an existing
 711  * connection.  This works similarly to SMBC_server().
 712  */
 713 SMBCSRV *
 714 SMBC_attr_server(TALLOC_CTX *ctx,
 715                  SMBCCTX *context,
 716                  const char *server,
 717                  const char *share,
 718                  char **pp_workgroup,
 719                  char **pp_username,
 720                  char **pp_password)
 721 {
 722         int flags;
 723         struct sockaddr_storage ss;
 724         struct cli_state *ipc_cli = NULL;
 725         struct rpc_pipe_client *pipe_hnd = NULL;
 726         NTSTATUS nt_status;
 727         SMBCSRV *srv=NULL;
 728         SMBCSRV *ipc_srv=NULL;
 729
 730         /*
 731          * Use srv->cli->desthost and srv->cli->share instead of
 732          * server and share below to connect to the actual share,
 733          * i.e., a normal share or a referred share from
 734          * 'msdfs proxy' share.
 735          */
 736         srv = SMBC_server(ctx, context, true, server, share,
 737                         pp_workgroup, pp_username, pp_password);
 738         if (!srv) {
 739                 return NULL;
 740         }
 741         server = srv->cli->desthost;
 742         share = srv->cli->share;
 743
 744         /*
 745          * See if we've already created this special connection.  Reference
 746          * our "special" share name '*IPC$', which is an impossible real share
 747          * name due to the leading asterisk.
 748          */
 749         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 750                                    pp_workgroup, pp_username, pp_password);
 751         if (!ipc_srv) {
 752
 753                 /* We didn't find a cached connection.  Get the password */
 754                 if (!*pp_password || (*pp_password)[0] == '\0') {
 755                         /* ... then retrieve it now. */
 756                         SMBC_call_auth_fn(ctx, context, server, share,
 757                                           pp_workgroup,
 758                                           pp_username,
 759                                           pp_password);
 760                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 761                                 errno = ENOMEM;
 762                                 return NULL;
 763                         }
 764                 }
 765
 766                 flags = 0;
 767                 if (smbc_getOptionUseKerberos(context)) {
 768                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 769                 }
 770                 if (smbc_getOptionUseCCache(context)) {
 771                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 772                 }
 773
 774                 zero_sockaddr(&ss);
 775                 nt_status = cli_full_connection(&ipc_cli,
 776                                                 global_myname(), server,
 777                                                 &ss, 0, "IPC$", "?????",
 778                                                 *pp_username,
 779                                                 *pp_workgroup,
 780                                                 *pp_password,
 781                                                 flags,
 782                                                 Undefined);
 783                 if (! NT_STATUS_IS_OK(nt_status)) {
 784                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 785                                  nt_errstr(nt_status)));
 786                         errno = ENOTSUP;
 787                         return NULL;
 788                 }
 789
 790                 if (context->internal->smb_encryption_level) {
 791                         /* Attempt UNIX smb encryption. */
 792                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 793                                                                   *pp_username,
 794                                                                   *pp_password,
 795                                                                   *pp_workgroup))) {
 796
 797                                 /*
 798                                  * context->smb_encryption_level ==
 799                                  * 1 means don't fail if encryption can't be
 800                                  * negotiated, == 2 means fail if encryption
 801                                  * can't be negotiated.
 802                                  */
 803
 804                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 805
 806                                 if (context->internal->smb_encryption_level == 2) {
 807                                         cli_shutdown(ipc_cli);
 808                                         errno = EPERM;
 809                                         return NULL;
 810                                 }
 811                         }
 812                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 813                 }
 814
 815                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 816                 if (!ipc_srv) {
 817                         errno = ENOMEM;
 818                         cli_shutdown(ipc_cli);
 819                         return NULL;
 820                 }
 821
 822                 ZERO_STRUCTP(ipc_srv);
 823                 ipc_srv->cli = ipc_cli;
 824
 825                 nt_status = cli_rpc_pipe_open_noauth(
 826                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 827                 if (!NT_STATUS_IS_OK(nt_status)) {
 828                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 829                         errno = ENOTSUP;
 830                         cli_shutdown(ipc_srv->cli);
 831                         free(ipc_srv);
 832                         return NULL;
 833                 }
 834
 835                 /*
 836                  * Some systems don't support
 837                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 838                  * so we might as well do it too.
 839                  */
 840
 841                 nt_status = rpccli_lsa_open_policy(
 842                         pipe_hnd,
 843                         talloc_tos(),
 844                         True,
 845                         GENERIC_EXECUTE_ACCESS,
 846                         &ipc_srv->pol);
 847
 848                 if (!NT_STATUS_IS_OK(nt_status)) {
 849                         errno = SMBC_errno(context, ipc_srv->cli);
 850                         cli_shutdown(ipc_srv->cli);
 851                         return NULL;
 852                 }
 853
 854                 /* now add it to the cache (internal or external) */
 855
 856                 errno = 0;      /* let cache function set errno if it likes */
 857                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 858                                                              server,
 859                                                              "*IPC$",
 860                                                              *pp_workgroup,
 861                                                              *pp_username)) {
 862                         DEBUG(3, (" Failed to add server to cache\n"));
 863                         if (errno == 0) {
 864                                 errno = ENOMEM;
 865                         }
 866                         cli_shutdown(ipc_srv->cli);
 867                         free(ipc_srv);
 868                         return NULL;
 869                 }
 870
 871                 DLIST_ADD(context->internal->servers, ipc_srv);
 872         }
 873
 874         return ipc_srv;
 875 }