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_lsarpc.h"
  31 #include "libcli/security/security.h"
  32
  33 /*
  34  * Check a server for being alive and well.
  35  * returns 0 if the server is in shape. Returns 1 on error
  36  *
  37  * Also useable outside libsmbclient to enable external cache
  38  * to do some checks too.
  39  */
  40 int
  41 SMBC_check_server(SMBCCTX * context,
  42                   SMBCSRV * server)
  43 {
  44         socklen_t size;
  45         struct sockaddr addr;
  46
  47         size = sizeof(addr);
  48         return (getpeername(server->cli->fd, &addr, &size) == -1);
  49 }
  50
  51 /*
  52  * Remove a server from the cached server list it's unused.
  53  * On success, 0 is returned. 1 is returned if the server could not be removed.
  54  *
  55  * Also useable outside libsmbclient
  56  */
  57 int
  58 SMBC_remove_unused_server(SMBCCTX * context,
  59                           SMBCSRV * srv)
  60 {
  61         SMBCFILE * file;
  62
  63         /* are we being fooled ? */
  64         if (!context || !context->internal->initialized || !srv) {
  65                 return 1;
  66         }
  67
  68         /* Check all open files/directories for a relation with this server */
  69         for (file = context->internal->files; file; file = file->next) {
  70                 if (file->srv == srv) {
  71                         /* Still used */
  72                         DEBUG(3, ("smbc_remove_usused_server: "
  73                                   "%p still used by %p.\n",
  74                                   srv, file));
  75                         return 1;
  76                 }
  77         }
  78
  79         DLIST_REMOVE(context->internal->servers, srv);
  80
  81         cli_shutdown(srv->cli);
  82         srv->cli = NULL;
  83
  84         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  85
  86         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  87
  88         SAFE_FREE(srv);
  89         return 0;
  90 }
  91
  92 /****************************************************************
  93  * Call the auth_fn with fixed size (fstring) buffers.
  94  ***************************************************************/
  95 void
  96 SMBC_call_auth_fn(TALLOC_CTX *ctx,
  97                   SMBCCTX *context,
  98                   const char *server,
  99                   const char *share,
 100                   char **pp_workgroup,
 101                   char **pp_username,
 102                   char **pp_password)
 103 {
 104         fstring workgroup;
 105         fstring username;
 106         fstring password;
 107         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 108
 109         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 110         strlcpy(username, *pp_username, sizeof(username));
 111         strlcpy(password, *pp_password, sizeof(password));
 112
 113         /* See if there's an authentication with context function provided */
 114         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 115         if (auth_with_context_fn)
 116         {
 117             (* auth_with_context_fn)(context,
 118                                      server, share,
 119                                      workgroup, sizeof(workgroup),
 120                                      username, sizeof(username),
 121                                      password, sizeof(password));
 122         }
 123         else
 124         {
 125             smbc_getFunctionAuthData(context)(server, share,
 126                                               workgroup, sizeof(workgroup),
 127                                               username, sizeof(username),
 128                                               password, sizeof(password));
 129         }
 130
 131         TALLOC_FREE(*pp_workgroup);
 132         TALLOC_FREE(*pp_username);
 133         TALLOC_FREE(*pp_password);
 134
 135         *pp_workgroup = talloc_strdup(ctx, workgroup);
 136         *pp_username = talloc_strdup(ctx, username);
 137         *pp_password = talloc_strdup(ctx, password);
 138 }
 139
 140
 141 void
 142 SMBC_get_auth_data(const char *server, const char *share,
 143                    char *workgroup_buf, int workgroup_buf_len,
 144                    char *username_buf, int username_buf_len,
 145                    char *password_buf, int password_buf_len)
 146 {
 147         /* Default function just uses provided data.  Nothing to do. */
 148 }
 149
 150
 151
 152 SMBCSRV *
 153 SMBC_find_server(TALLOC_CTX *ctx,
 154                  SMBCCTX *context,
 155                  const char *server,
 156                  const char *share,
 157                  char **pp_workgroup,
 158                  char **pp_username,
 159                  char **pp_password)
 160 {
 161         SMBCSRV *srv;
 162         int auth_called = 0;
 163
 164         if (!pp_workgroup || !pp_username || !pp_password) {
 165                 return NULL;
 166         }
 167
 168 check_server_cache:
 169
 170         srv = smbc_getFunctionGetCachedServer(context)(context,
 171                                                        server, share,
 172                                                        *pp_workgroup,
 173                                                        *pp_username);
 174
 175         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 176                                      !*pp_password || !(*pp_password)[0])) {
 177                 SMBC_call_auth_fn(ctx, context, server, share,
 178                                   pp_workgroup, pp_username, pp_password);
 179
 180                 /*
 181                  * However, smbc_auth_fn may have picked up info relating to
 182                  * an existing connection, so try for an existing connection
 183                  * again ...
 184                  */
 185                 auth_called = 1;
 186                 goto check_server_cache;
 187
 188         }
 189
 190         if (srv) {
 191                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 192                         /*
 193                          * This server is no good anymore
 194                          * Try to remove it and check for more possible
 195                          * servers in the cache
 196                          */
 197                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 198                                                                         srv)) {
 199                                 /*
 200                                  * We could not remove the server completely,
 201                                  * remove it from the cache so we will not get
 202                                  * it again. It will be removed when the last
 203                                  * file/dir is closed.
 204                                  */
 205                                 smbc_getFunctionRemoveCachedServer(context)(context,
 206                                                                             srv);
 207                         }
 208
 209                         /*
 210                          * Maybe there are more cached connections to this
 211                          * server
 212                          */
 213                         goto check_server_cache;
 214                 }
 215
 216                 return srv;
 217         }
 218
 219         return NULL;
 220 }
 221
 222 /*
 223  * Connect to a server, possibly on an existing connection
 224  *
 225  * Here, what we want to do is: If the server and username
 226  * match an existing connection, reuse that, otherwise, establish a
 227  * new connection.
 228  *
 229  * If we have to create a new connection, call the auth_fn to get the
 230  * info we need, unless the username and password were passed in.
 231  */
 232
 233 static SMBCSRV *
 234 SMBC_server_internal(TALLOC_CTX *ctx,
 235             SMBCCTX *context,
 236             bool connect_if_not_found,
 237             const char *server,
 238             const char *share,
 239             char **pp_workgroup,
 240             char **pp_username,
 241             char **pp_password,
 242             bool *in_cache)
 243 {
 244         SMBCSRV *srv=NULL;
 245         char *workgroup = NULL;
 246         struct cli_state *c;
 247         struct nmb_name called, calling;
 248         const char *server_n = server;
 249         struct sockaddr_storage ss;
 250         int tried_reverse = 0;
 251         int port_try_first;
 252         int port_try_next;
 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
 259         zero_sockaddr(&ss);
 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 != '\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 (srv->cli->cnum == (uint16) -1) {
 296                         /* Ensure we have accurate auth info */
 297                         SMBC_call_auth_fn(ctx, context,
 298                                           srv->cli->desthost,
 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_tcon_andx(srv->cli, srv->cli->share, "?????",
 320                                                *pp_password,
 321                                                strlen(*pp_password)+1);
 322                         if (!NT_STATUS_IS_OK(status)) {
 323                                 errno = map_errno_from_nt_status(status);
 324                                 cli_shutdown(srv->cli);
 325                                 srv->cli = NULL;
 326                                 smbc_getFunctionRemoveCachedServer(context)(context,
 327                                                                             srv);
 328                                 srv = NULL;
 329                         }
 330
 331                         /* Determine if this share supports case sensitivity */
 332                         if (is_ipc) {
 333                                 DEBUG(4,
 334                                       ("IPC$ so ignore case sensitivity\n"));
 335                         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 336                                 DEBUG(4, ("Could not retrieve "
 337                                           "case sensitivity flag: %s.\n",
 338                                           cli_errstr(c)));
 339
 340                                 /*
 341                                  * We can't determine the case sensitivity of
 342                                  * the share. We have no choice but to use the
 343                                  * user-specified case sensitivity setting.
 344                                  */
 345                                 if (smbc_getOptionCaseSensitive(context)) {
 346                                         cli_set_case_sensitive(c, True);
 347                                 } else {
 348                                         cli_set_case_sensitive(c, False);
 349                                 }
 350                         } else {
 351                                 DEBUG(4,
 352                                       ("Case sensitive: %s\n",
 353                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 354                                         ? "True"
 355                                         : "False")));
 356                                 cli_set_case_sensitive(
 357                                         c,
 358                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 359                                          ? True
 360                                          : False));
 361                         }
 362
 363                         /*
 364                          * Regenerate the dev value since it's based on both
 365                          * server and share
 366                          */
 367                         if (srv) {
 368                                 srv->dev = (dev_t)(str_checksum(srv->cli->desthost) ^
 369                                                    str_checksum(srv->cli->share));
 370                         }
 371                 }
 372         }
 373
 374         /* If we have a connection... */
 375         if (srv) {
 376
 377                 /* ... then we're done here.  Give 'em what they came for. */
 378                 *in_cache = true;
 379                 goto done;
 380         }
 381
 382         /* If we're not asked to connect when a connection doesn't exist... */
 383         if (! connect_if_not_found) {
 384                 /* ... then we're done here. */
 385                 return NULL;
 386         }
 387
 388         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 389                 errno = ENOMEM;
 390                 return NULL;
 391         }
 392
 393         make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
 394         make_nmb_name(&called , server, 0x20);
 395
 396         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 397
 398         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 399
 400 again:
 401
 402         zero_sockaddr(&ss);
 403
 404         /* have to open a new connection */
 405         if ((c = cli_initialise()) == NULL) {
 406                 errno = ENOMEM;
 407                 return NULL;
 408         }
 409
 410         if (smbc_getOptionUseKerberos(context)) {
 411                 c->use_kerberos = True;
 412         }
 413
 414         if (smbc_getOptionFallbackAfterKerberos(context)) {
 415                 c->fallback_after_kerberos = True;
 416         }
 417
 418         if (smbc_getOptionUseCCache(context)) {
 419                 c->use_ccache = True;
 420         }
 421
 422         c->timeout = smbc_getTimeout(context);
 423
 424         /*
 425          * Force use of port 139 for first try if share is $IPC, empty, or
 426          * null, so browse lists can work
 427          */
 428         if (share == NULL || *share == '\0' || is_ipc) {
 429                 port_try_first = 139;
 430                 port_try_next = 445;
 431         } else {
 432                 port_try_first = 445;
 433                 port_try_next = 139;
 434         }
 435
 436         c->port = port_try_first;
 437
 438         status = cli_connect(c, server_n, &ss);
 439         if (!NT_STATUS_IS_OK(status)) {
 440
 441                 /* First connection attempt failed.  Try alternate port. */
 442                 c->port = port_try_next;
 443
 444                 status = cli_connect(c, server_n, &ss);
 445                 if (!NT_STATUS_IS_OK(status)) {
 446                         cli_shutdown(c);
 447                         errno = ETIMEDOUT;
 448                         return NULL;
 449                 }
 450         }
 451
 452         if (!cli_session_request(c, &calling, &called)) {
 453                 cli_shutdown(c);
 454                 if (strcmp(called.name, "*SMBSERVER")) {
 455                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 456                         goto again;
 457                 } else {  /* Try one more time, but ensure we don't loop */
 458
 459                         /* Only try this if server is an IP address ... */
 460
 461                         if (is_ipaddress(server) && !tried_reverse) {
 462                                 fstring remote_name;
 463                                 struct sockaddr_storage rem_ss;
 464
 465                                 if (!interpret_string_addr(&rem_ss, server,
 466                                                            NI_NUMERICHOST)) {
 467                                         DEBUG(4, ("Could not convert IP address "
 468                                                   "%s to struct sockaddr_storage\n",
 469                                                   server));
 470                                         errno = ETIMEDOUT;
 471                                         return NULL;
 472                                 }
 473
 474                                 tried_reverse++; /* Yuck */
 475
 476                                 if (name_status_find("*", 0, 0,
 477                                                      &rem_ss, remote_name)) {
 478                                         make_nmb_name(&called,
 479                                                       remote_name,
 480                                                       0x20);
 481                                         goto again;
 482                                 }
 483                         }
 484                 }
 485                 errno = ETIMEDOUT;
 486                 return NULL;
 487         }
 488
 489         DEBUG(4,(" session request ok\n"));
 490
 491         status = cli_negprot(c);
 492
 493         if (!NT_STATUS_IS_OK(status)) {
 494                 cli_shutdown(c);
 495                 errno = ETIMEDOUT;
 496                 return NULL;
 497         }
 498
 499         username_used = *pp_username;
 500
 501         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 502                                                *pp_password,
 503                                                strlen(*pp_password),
 504                                                *pp_password,
 505                                                strlen(*pp_password),
 506                                                *pp_workgroup))) {
 507
 508                 /* Failed.  Try an anonymous login, if allowed by flags. */
 509                 username_used = "";
 510
 511                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 512                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 513                                                        *pp_password, 1,
 514                                                        *pp_password, 0,
 515                                                        *pp_workgroup))) {
 516
 517                         cli_shutdown(c);
 518                         errno = EPERM;
 519                         return NULL;
 520                 }
 521         }
 522
 523         status = cli_init_creds(c, username_used,
 524                                 *pp_workgroup, *pp_password);
 525         if (!NT_STATUS_IS_OK(status)) {
 526                 errno = map_errno_from_nt_status(status);
 527                 cli_shutdown(c);
 528                 return NULL;
 529         }
 530
 531         DEBUG(4,(" session setup ok\n"));
 532
 533         /* here's the fun part....to support 'msdfs proxy' shares
 534            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 535            here before trying to connect to the original share.
 536            cli_check_msdfs_proxy() will fail if it is a normal share. */
 537
 538         if ((c->capabilities & CAP_DFS) &&
 539                         cli_check_msdfs_proxy(ctx, c, share,
 540                                 &newserver, &newshare,
 541                                 /* FIXME: cli_check_msdfs_proxy() does
 542                                    not support smbc_smb_encrypt_level type */
 543                                 context->internal->smb_encryption_level ?
 544                                         true : false,
 545                                 *pp_username,
 546                                 *pp_password,
 547                                 *pp_workgroup)) {
 548                 cli_shutdown(c);
 549                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 550                                 newserver, newshare, pp_workgroup,
 551                                 pp_username, pp_password, in_cache);
 552                 TALLOC_FREE(newserver);
 553                 TALLOC_FREE(newshare);
 554                 return srv;
 555         }
 556
 557         /* must be a normal share */
 558
 559         status = cli_tcon_andx(c, share, "?????", *pp_password,
 560                                strlen(*pp_password)+1);
 561         if (!NT_STATUS_IS_OK(status)) {
 562                 errno = map_errno_from_nt_status(status);
 563                 cli_shutdown(c);
 564                 return NULL;
 565         }
 566
 567         DEBUG(4,(" tconx ok\n"));
 568
 569         /* Determine if this share supports case sensitivity */
 570         if (is_ipc) {
 571                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 572         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 573                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 574                           cli_errstr(c)));
 575
 576                 /*
 577                  * We can't determine the case sensitivity of the share. We
 578                  * have no choice but to use the user-specified case
 579                  * sensitivity setting.
 580                  */
 581                 if (smbc_getOptionCaseSensitive(context)) {
 582                         cli_set_case_sensitive(c, True);
 583                 } else {
 584                         cli_set_case_sensitive(c, False);
 585                 }
 586         } else {
 587                 DEBUG(4, ("Case sensitive: %s\n",
 588                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 589                            ? "True"
 590                            : "False")));
 591                 cli_set_case_sensitive(c,
 592                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 593                                         ? True
 594                                         : False));
 595         }
 596
 597         if (context->internal->smb_encryption_level) {
 598                 /* Attempt UNIX smb encryption. */
 599                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 600                                                           username_used,
 601                                                           *pp_password,
 602                                                           *pp_workgroup))) {
 603
 604                         /*
 605                          * context->smb_encryption_level == 1
 606                          * means don't fail if encryption can't be negotiated,
 607                          * == 2 means fail if encryption can't be negotiated.
 608                          */
 609
 610                         DEBUG(4,(" SMB encrypt failed\n"));
 611
 612                         if (context->internal->smb_encryption_level == 2) {
 613                                 cli_shutdown(c);
 614                                 errno = EPERM;
 615                                 return NULL;
 616                         }
 617                 }
 618                 DEBUG(4,(" SMB encrypt ok\n"));
 619         }
 620
 621         /*
 622          * Ok, we have got a nice connection
 623          * Let's allocate a server structure.
 624          */
 625
 626         srv = SMB_MALLOC_P(SMBCSRV);
 627         if (!srv) {
 628                 cli_shutdown(c);
 629                 errno = ENOMEM;
 630                 return NULL;
 631         }
 632
 633         ZERO_STRUCTP(srv);
 634         srv->cli = c;
 635         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 636         srv->no_pathinfo = False;
 637         srv->no_pathinfo2 = False;
 638         srv->no_nt_session = False;
 639
 640 done:
 641         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 642                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 643         } else {
 644                 workgroup = *pp_workgroup;
 645         }
 646         if(!workgroup) {
 647                 return NULL;
 648         }
 649
 650         /* set the credentials to make DFS work */
 651         smbc_set_credentials_with_fallback(context,
 652                                            workgroup,
 653                                            *pp_username,
 654                                            *pp_password);
 655
 656         return srv;
 657 }
 658
 659 SMBCSRV *
 660 SMBC_server(TALLOC_CTX *ctx,
 661                 SMBCCTX *context,
 662                 bool connect_if_not_found,
 663                 const char *server,
 664                 const char *share,
 665                 char **pp_workgroup,
 666                 char **pp_username,
 667                 char **pp_password)
 668 {
 669         SMBCSRV *srv=NULL;
 670         bool in_cache = false;
 671
 672         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 673                         server, share, pp_workgroup,
 674                         pp_username, pp_password, &in_cache);
 675
 676         if (!srv) {
 677                 return NULL;
 678         }
 679         if (in_cache) {
 680                 return srv;
 681         }
 682
 683         /* Now add it to the cache (internal or external)  */
 684         /* Let the cache function set errno if it wants to */
 685         errno = 0;
 686         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 687                                                 server, share,
 688                                                 *pp_workgroup,
 689                                                 *pp_username)) {
 690                 int saved_errno = errno;
 691                 DEBUG(3, (" Failed to add server to cache\n"));
 692                 errno = saved_errno;
 693                 if (errno == 0) {
 694                         errno = ENOMEM;
 695                 }
 696                 SAFE_FREE(srv);
 697                 return NULL;
 698         }
 699
 700         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 701                 server, share, srv));
 702
 703         DLIST_ADD(context->internal->servers, srv);
 704         return srv;
 705 }
 706
 707 /*
 708  * Connect to a server for getting/setting attributes, possibly on an existing
 709  * connection.  This works similarly to SMBC_server().
 710  */
 711 SMBCSRV *
 712 SMBC_attr_server(TALLOC_CTX *ctx,
 713                  SMBCCTX *context,
 714                  const char *server,
 715                  const char *share,
 716                  char **pp_workgroup,
 717                  char **pp_username,
 718                  char **pp_password)
 719 {
 720         int flags;
 721         struct sockaddr_storage ss;
 722         struct cli_state *ipc_cli = NULL;
 723         struct rpc_pipe_client *pipe_hnd = NULL;
 724         NTSTATUS nt_status;
 725         SMBCSRV *srv=NULL;
 726         SMBCSRV *ipc_srv=NULL;
 727
 728         /*
 729          * Use srv->cli->desthost and srv->cli->share instead of
 730          * server and share below to connect to the actual share,
 731          * i.e., a normal share or a referred share from
 732          * 'msdfs proxy' share.
 733          */
 734         srv = SMBC_server(ctx, context, true, server, share,
 735                         pp_workgroup, pp_username, pp_password);
 736         if (!srv) {
 737                 return NULL;
 738         }
 739         server = srv->cli->desthost;
 740         share = srv->cli->share;
 741
 742         /*
 743          * See if we've already created this special connection.  Reference
 744          * our "special" share name '*IPC$', which is an impossible real share
 745          * name due to the leading asterisk.
 746          */
 747         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 748                                    pp_workgroup, pp_username, pp_password);
 749         if (!ipc_srv) {
 750
 751                 /* We didn't find a cached connection.  Get the password */
 752                 if (!*pp_password || (*pp_password)[0] == '\0') {
 753                         /* ... then retrieve it now. */
 754                         SMBC_call_auth_fn(ctx, context, server, share,
 755                                           pp_workgroup,
 756                                           pp_username,
 757                                           pp_password);
 758                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 759                                 errno = ENOMEM;
 760                                 return NULL;
 761                         }
 762                 }
 763
 764                 flags = 0;
 765                 if (smbc_getOptionUseKerberos(context)) {
 766                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 767                 }
 768                 if (smbc_getOptionUseCCache(context)) {
 769                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 770                 }
 771
 772                 zero_sockaddr(&ss);
 773                 nt_status = cli_full_connection(&ipc_cli,
 774                                                 global_myname(), server,
 775                                                 &ss, 0, "IPC$", "?????",
 776                                                 *pp_username,
 777                                                 *pp_workgroup,
 778                                                 *pp_password,
 779                                                 flags,
 780                                                 Undefined, NULL);
 781                 if (! NT_STATUS_IS_OK(nt_status)) {
 782                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 783                                  nt_errstr(nt_status)));
 784                         errno = ENOTSUP;
 785                         return NULL;
 786                 }
 787
 788                 if (context->internal->smb_encryption_level) {
 789                         /* Attempt UNIX smb encryption. */
 790                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 791                                                                   *pp_username,
 792                                                                   *pp_password,
 793                                                                   *pp_workgroup))) {
 794
 795                                 /*
 796                                  * context->smb_encryption_level ==
 797                                  * 1 means don't fail if encryption can't be
 798                                  * negotiated, == 2 means fail if encryption
 799                                  * can't be negotiated.
 800                                  */
 801
 802                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 803
 804                                 if (context->internal->smb_encryption_level == 2) {
 805                                         cli_shutdown(ipc_cli);
 806                                         errno = EPERM;
 807                                         return NULL;
 808                                 }
 809                         }
 810                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 811                 }
 812
 813                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 814                 if (!ipc_srv) {
 815                         errno = ENOMEM;
 816                         cli_shutdown(ipc_cli);
 817                         return NULL;
 818                 }
 819
 820                 ZERO_STRUCTP(ipc_srv);
 821                 ipc_srv->cli = ipc_cli;
 822
 823                 nt_status = cli_rpc_pipe_open_noauth(
 824                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 825                 if (!NT_STATUS_IS_OK(nt_status)) {
 826                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 827                         errno = ENOTSUP;
 828                         cli_shutdown(ipc_srv->cli);
 829                         free(ipc_srv);
 830                         return NULL;
 831                 }
 832
 833                 /*
 834                  * Some systems don't support
 835                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 836                  * so we might as well do it too.
 837                  */
 838
 839                 nt_status = rpccli_lsa_open_policy(
 840                         pipe_hnd,
 841                         talloc_tos(),
 842                         True,
 843                         GENERIC_EXECUTE_ACCESS,
 844                         &ipc_srv->pol);
 845
 846                 if (!NT_STATUS_IS_OK(nt_status)) {
 847                         errno = SMBC_errno(context, ipc_srv->cli);
 848                         cli_shutdown(ipc_srv->cli);
 849                         return NULL;
 850                 }
 851
 852                 /* now add it to the cache (internal or external) */
 853
 854                 errno = 0;      /* let cache function set errno if it likes */
 855                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 856                                                              server,
 857                                                              "*IPC$",
 858                                                              *pp_workgroup,
 859                                                              *pp_username)) {
 860                         DEBUG(3, (" Failed to add server to cache\n"));
 861                         if (errno == 0) {
 862                                 errno = ENOMEM;
 863                         }
 864                         cli_shutdown(ipc_srv->cli);
 865                         free(ipc_srv);
 866                         return NULL;
 867                 }
 868
 869                 DLIST_ADD(context->internal->servers, ipc_srv);
 870         }
 871
 872         return ipc_srv;
 873 }