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
  36 /*
  37  * Check a server for being alive and well.
  38  * returns 0 if the server is in shape. Returns 1 on error
  39  *
  40  * Also useable outside libsmbclient to enable external cache
  41  * to do some checks too.
  42  */
  43 int
  44 SMBC_check_server(SMBCCTX * context,
  45                   SMBCSRV * server)
  46 {
  47         socklen_t size;
  48         struct sockaddr addr;
  49
  50         size = sizeof(addr);
  51         return (getpeername(server->cli->fd, &addr, &size) == -1);
  52 }
  53
  54 /*
  55  * Remove a server from the cached server list it's unused.
  56  * On success, 0 is returned. 1 is returned if the server could not be removed.
  57  *
  58  * Also useable outside libsmbclient
  59  */
  60 int
  61 SMBC_remove_unused_server(SMBCCTX * context,
  62                           SMBCSRV * srv)
  63 {
  64         SMBCFILE * file;
  65
  66         /* are we being fooled ? */
  67         if (!context || !context->internal->initialized || !srv) {
  68                 return 1;
  69         }
  70
  71         /* Check all open files/directories for a relation with this server */
  72         for (file = context->internal->files; file; file = file->next) {
  73                 if (file->srv == srv) {
  74                         /* Still used */
  75                         DEBUG(3, ("smbc_remove_usused_server: "
  76                                   "%p still used by %p.\n",
  77                                   srv, file));
  78                         return 1;
  79                 }
  80         }
  81
  82         DLIST_REMOVE(context->internal->servers, srv);
  83
  84         cli_shutdown(srv->cli);
  85         srv->cli = NULL;
  86
  87         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  88
  89         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  90
  91         SAFE_FREE(srv);
  92         return 0;
  93 }
  94
  95 /****************************************************************
  96  * Call the auth_fn with fixed size (fstring) buffers.
  97  ***************************************************************/
  98 void
  99 SMBC_call_auth_fn(TALLOC_CTX *ctx,
 100                   SMBCCTX *context,
 101                   const char *server,
 102                   const char *share,
 103                   char **pp_workgroup,
 104                   char **pp_username,
 105                   char **pp_password)
 106 {
 107         fstring workgroup;
 108         fstring username;
 109         fstring password;
 110         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 111
 112         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 113         strlcpy(username, *pp_username, sizeof(username));
 114         strlcpy(password, *pp_password, sizeof(password));
 115
 116         /* See if there's an authentication with context function provided */
 117         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 118         if (auth_with_context_fn)
 119         {
 120             (* auth_with_context_fn)(context,
 121                                      server, share,
 122                                      workgroup, sizeof(workgroup),
 123                                      username, sizeof(username),
 124                                      password, sizeof(password));
 125         }
 126         else
 127         {
 128             smbc_getFunctionAuthData(context)(server, share,
 129                                               workgroup, sizeof(workgroup),
 130                                               username, sizeof(username),
 131                                               password, sizeof(password));
 132         }
 133
 134         TALLOC_FREE(*pp_workgroup);
 135         TALLOC_FREE(*pp_username);
 136         TALLOC_FREE(*pp_password);
 137
 138         *pp_workgroup = talloc_strdup(ctx, workgroup);
 139         *pp_username = talloc_strdup(ctx, username);
 140         *pp_password = talloc_strdup(ctx, password);
 141 }
 142
 143
 144 void
 145 SMBC_get_auth_data(const char *server, const char *share,
 146                    char *workgroup_buf, int workgroup_buf_len,
 147                    char *username_buf, int username_buf_len,
 148                    char *password_buf, int password_buf_len)
 149 {
 150         /* Default function just uses provided data.  Nothing to do. */
 151 }
 152
 153
 154
 155 SMBCSRV *
 156 SMBC_find_server(TALLOC_CTX *ctx,
 157                  SMBCCTX *context,
 158                  const char *server,
 159                  const char *share,
 160                  char **pp_workgroup,
 161                  char **pp_username,
 162                  char **pp_password)
 163 {
 164         SMBCSRV *srv;
 165         int auth_called = 0;
 166
 167         if (!pp_workgroup || !pp_username || !pp_password) {
 168                 return NULL;
 169         }
 170
 171 check_server_cache:
 172
 173         srv = smbc_getFunctionGetCachedServer(context)(context,
 174                                                        server, share,
 175                                                        *pp_workgroup,
 176                                                        *pp_username);
 177
 178         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 179                                      !*pp_password || !(*pp_password)[0])) {
 180                 SMBC_call_auth_fn(ctx, context, server, share,
 181                                   pp_workgroup, pp_username, pp_password);
 182
 183                 /*
 184                  * However, smbc_auth_fn may have picked up info relating to
 185                  * an existing connection, so try for an existing connection
 186                  * again ...
 187                  */
 188                 auth_called = 1;
 189                 goto check_server_cache;
 190
 191         }
 192
 193         if (srv) {
 194                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 195                         /*
 196                          * This server is no good anymore
 197                          * Try to remove it and check for more possible
 198                          * servers in the cache
 199                          */
 200                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 201                                                                         srv)) {
 202                                 /*
 203                                  * We could not remove the server completely,
 204                                  * remove it from the cache so we will not get
 205                                  * it again. It will be removed when the last
 206                                  * file/dir is closed.
 207                                  */
 208                                 smbc_getFunctionRemoveCachedServer(context)(context,
 209                                                                             srv);
 210                         }
 211
 212                         /*
 213                          * Maybe there are more cached connections to this
 214                          * server
 215                          */
 216                         goto check_server_cache;
 217                 }
 218
 219                 return srv;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 /*
 226  * Connect to a server, possibly on an existing connection
 227  *
 228  * Here, what we want to do is: If the server and username
 229  * match an existing connection, reuse that, otherwise, establish a
 230  * new connection.
 231  *
 232  * If we have to create a new connection, call the auth_fn to get the
 233  * info we need, unless the username and password were passed in.
 234  */
 235
 236 static SMBCSRV *
 237 SMBC_server_internal(TALLOC_CTX *ctx,
 238             SMBCCTX *context,
 239             bool connect_if_not_found,
 240             const char *server,
 241             const char *share,
 242             char **pp_workgroup,
 243             char **pp_username,
 244             char **pp_password,
 245             bool *in_cache)
 246 {
 247         SMBCSRV *srv=NULL;
 248         char *workgroup = NULL;
 249         struct cli_state *c;
 250         struct nmb_name called, calling;
 251         const char *server_n = server;
 252         struct sockaddr_storage ss;
 253         int tried_reverse = 0;
 254         int port_try_first;
 255         int port_try_next;
 256         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 257         uint32 fs_attrs = 0;
 258         const char *username_used;
 259         NTSTATUS status;
 260         char *newserver, *newshare;
 261
 262         zero_sockaddr(&ss);
 263         ZERO_STRUCT(c);
 264         *in_cache = false;
 265
 266         if (server[0] == 0) {
 267                 errno = EPERM;
 268                 return NULL;
 269         }
 270
 271         /* Look for a cached connection */
 272         srv = SMBC_find_server(ctx, context, server, share,
 273                                pp_workgroup, pp_username, pp_password);
 274
 275         /*
 276          * If we found a connection and we're only allowed one share per
 277          * server...
 278          */
 279         if (srv &&
 280             *share != '\0' &&
 281             smbc_getOptionOneSharePerServer(context)) {
 282
 283                 /*
 284                  * ... then if there's no current connection to the share,
 285                  * connect to it.  SMBC_find_server(), or rather the function
 286                  * pointed to by context->get_cached_srv_fn which
 287                  * was called by SMBC_find_server(), will have issued a tree
 288                  * disconnect if the requested share is not the same as the
 289                  * one that was already connected.
 290                  */
 291
 292                 /*
 293                  * Use srv->cli->desthost and srv->cli->share instead of
 294                  * server and share below to connect to the actual share,
 295                  * i.e., a normal share or a referred share from
 296                  * 'msdfs proxy' share.
 297                  */
 298                 if (srv->cli->cnum == (uint16) -1) {
 299                         /* Ensure we have accurate auth info */
 300                         SMBC_call_auth_fn(ctx, context,
 301                                           srv->cli->desthost,
 302                                           srv->cli->share,
 303                                           pp_workgroup,
 304                                           pp_username,
 305                                           pp_password);
 306
 307                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 308                                 errno = ENOMEM;
 309                                 cli_shutdown(srv->cli);
 310                                 srv->cli = NULL;
 311                                 smbc_getFunctionRemoveCachedServer(context)(context,
 312                                                                             srv);
 313                                 return NULL;
 314                         }
 315
 316                         /*
 317                          * We don't need to renegotiate encryption
 318                          * here as the encryption context is not per
 319                          * tid.
 320                          */
 321
 322                         status = cli_tcon_andx(srv->cli, srv->cli->share, "?????",
 323                                                *pp_password,
 324                                                strlen(*pp_password)+1);
 325                         if (!NT_STATUS_IS_OK(status)) {
 326                                 errno = map_errno_from_nt_status(status);
 327                                 cli_shutdown(srv->cli);
 328                                 srv->cli = NULL;
 329                                 smbc_getFunctionRemoveCachedServer(context)(context,
 330                                                                             srv);
 331                                 srv = NULL;
 332                         }
 333
 334                         /* Determine if this share supports case sensitivity */
 335                         if (is_ipc) {
 336                                 DEBUG(4,
 337                                       ("IPC$ so ignore case sensitivity\n"));
 338                         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 339                                 DEBUG(4, ("Could not retrieve "
 340                                           "case sensitivity flag: %s.\n",
 341                                           cli_errstr(c)));
 342
 343                                 /*
 344                                  * We can't determine the case sensitivity of
 345                                  * the share. We have no choice but to use the
 346                                  * user-specified case sensitivity setting.
 347                                  */
 348                                 if (smbc_getOptionCaseSensitive(context)) {
 349                                         cli_set_case_sensitive(c, True);
 350                                 } else {
 351                                         cli_set_case_sensitive(c, False);
 352                                 }
 353                         } else {
 354                                 DEBUG(4,
 355                                       ("Case sensitive: %s\n",
 356                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 357                                         ? "True"
 358                                         : "False")));
 359                                 cli_set_case_sensitive(
 360                                         c,
 361                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 362                                          ? True
 363                                          : False));
 364                         }
 365
 366                         /*
 367                          * Regenerate the dev value since it's based on both
 368                          * server and share
 369                          */
 370                         if (srv) {
 371                                 srv->dev = (dev_t)(str_checksum(srv->cli->desthost) ^
 372                                                    str_checksum(srv->cli->share));
 373                         }
 374                 }
 375         }
 376
 377         /* If we have a connection... */
 378         if (srv) {
 379
 380                 /* ... then we're done here.  Give 'em what they came for. */
 381                 *in_cache = true;
 382                 goto done;
 383         }
 384
 385         /* If we're not asked to connect when a connection doesn't exist... */
 386         if (! connect_if_not_found) {
 387                 /* ... then we're done here. */
 388                 return NULL;
 389         }
 390
 391         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 392                 errno = ENOMEM;
 393                 return NULL;
 394         }
 395
 396         make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
 397         make_nmb_name(&called , server, 0x20);
 398
 399         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 400
 401         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 402
 403 again:
 404
 405         zero_sockaddr(&ss);
 406
 407         /* have to open a new connection */
 408         if ((c = cli_initialise()) == NULL) {
 409                 errno = ENOMEM;
 410                 return NULL;
 411         }
 412
 413         if (smbc_getOptionUseKerberos(context)) {
 414                 c->use_kerberos = True;
 415         }
 416
 417         if (smbc_getOptionFallbackAfterKerberos(context)) {
 418                 c->fallback_after_kerberos = True;
 419         }
 420
 421         if (smbc_getOptionUseCCache(context)) {
 422                 c->use_ccache = True;
 423         }
 424
 425         c->timeout = smbc_getTimeout(context);
 426
 427         /*
 428          * Force use of port 139 for first try if share is $IPC, empty, or
 429          * null, so browse lists can work
 430          */
 431         if (share == NULL || *share == '\0' || is_ipc) {
 432                 port_try_first = 139;
 433                 port_try_next = 445;
 434         } else {
 435                 port_try_first = 445;
 436                 port_try_next = 139;
 437         }
 438
 439         c->port = port_try_first;
 440
 441         status = cli_connect(c, server_n, &ss);
 442         if (!NT_STATUS_IS_OK(status)) {
 443
 444                 /* First connection attempt failed.  Try alternate port. */
 445                 c->port = port_try_next;
 446
 447                 status = cli_connect(c, server_n, &ss);
 448                 if (!NT_STATUS_IS_OK(status)) {
 449                         cli_shutdown(c);
 450                         errno = ETIMEDOUT;
 451                         return NULL;
 452                 }
 453         }
 454
 455         if (!cli_session_request(c, &calling, &called)) {
 456                 cli_shutdown(c);
 457                 if (strcmp(called.name, "*SMBSERVER")) {
 458                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 459                         goto again;
 460                 } else {  /* Try one more time, but ensure we don't loop */
 461
 462                         /* Only try this if server is an IP address ... */
 463
 464                         if (is_ipaddress(server) && !tried_reverse) {
 465                                 fstring remote_name;
 466                                 struct sockaddr_storage rem_ss;
 467
 468                                 if (!interpret_string_addr(&rem_ss, server,
 469                                                            NI_NUMERICHOST)) {
 470                                         DEBUG(4, ("Could not convert IP address "
 471                                                   "%s to struct sockaddr_storage\n",
 472                                                   server));
 473                                         errno = ETIMEDOUT;
 474                                         return NULL;
 475                                 }
 476
 477                                 tried_reverse++; /* Yuck */
 478
 479                                 if (name_status_find("*", 0, 0,
 480                                                      &rem_ss, remote_name)) {
 481                                         make_nmb_name(&called,
 482                                                       remote_name,
 483                                                       0x20);
 484                                         goto again;
 485                                 }
 486                         }
 487                 }
 488                 errno = ETIMEDOUT;
 489                 return NULL;
 490         }
 491
 492         DEBUG(4,(" session request ok\n"));
 493
 494         status = cli_negprot(c);
 495
 496         if (!NT_STATUS_IS_OK(status)) {
 497                 cli_shutdown(c);
 498                 errno = ETIMEDOUT;
 499                 return NULL;
 500         }
 501
 502         username_used = *pp_username;
 503
 504         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 505                                                *pp_password,
 506                                                strlen(*pp_password),
 507                                                *pp_password,
 508                                                strlen(*pp_password),
 509                                                *pp_workgroup))) {
 510
 511                 /* Failed.  Try an anonymous login, if allowed by flags. */
 512                 username_used = "";
 513
 514                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 515                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 516                                                        *pp_password, 1,
 517                                                        *pp_password, 0,
 518                                                        *pp_workgroup))) {
 519
 520                         cli_shutdown(c);
 521                         errno = EPERM;
 522                         return NULL;
 523                 }
 524         }
 525
 526         status = cli_init_creds(c, username_used,
 527                                 *pp_workgroup, *pp_password);
 528         if (!NT_STATUS_IS_OK(status)) {
 529                 errno = map_errno_from_nt_status(status);
 530                 cli_shutdown(c);
 531                 return NULL;
 532         }
 533
 534         DEBUG(4,(" session setup ok\n"));
 535
 536         /* here's the fun part....to support 'msdfs proxy' shares
 537            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 538            here before trying to connect to the original share.
 539            cli_check_msdfs_proxy() will fail if it is a normal share. */
 540
 541         if ((c->capabilities & CAP_DFS) &&
 542                         cli_check_msdfs_proxy(ctx, c, share,
 543                                 &newserver, &newshare,
 544                                 /* FIXME: cli_check_msdfs_proxy() does
 545                                    not support smbc_smb_encrypt_level type */
 546                                 context->internal->smb_encryption_level ?
 547                                         true : false,
 548                                 *pp_username,
 549                                 *pp_password,
 550                                 *pp_workgroup)) {
 551                 cli_shutdown(c);
 552                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 553                                 newserver, newshare, pp_workgroup,
 554                                 pp_username, pp_password, in_cache);
 555                 TALLOC_FREE(newserver);
 556                 TALLOC_FREE(newshare);
 557                 return srv;
 558         }
 559
 560         /* must be a normal share */
 561
 562         status = cli_tcon_andx(c, share, "?????", *pp_password,
 563                                strlen(*pp_password)+1);
 564         if (!NT_STATUS_IS_OK(status)) {
 565                 errno = map_errno_from_nt_status(status);
 566                 cli_shutdown(c);
 567                 return NULL;
 568         }
 569
 570         DEBUG(4,(" tconx ok\n"));
 571
 572         /* Determine if this share supports case sensitivity */
 573         if (is_ipc) {
 574                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 575         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 576                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 577                           cli_errstr(c)));
 578
 579                 /*
 580                  * We can't determine the case sensitivity of the share. We
 581                  * have no choice but to use the user-specified case
 582                  * sensitivity setting.
 583                  */
 584                 if (smbc_getOptionCaseSensitive(context)) {
 585                         cli_set_case_sensitive(c, True);
 586                 } else {
 587                         cli_set_case_sensitive(c, False);
 588                 }
 589         } else {
 590                 DEBUG(4, ("Case sensitive: %s\n",
 591                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 592                            ? "True"
 593                            : "False")));
 594                 cli_set_case_sensitive(c,
 595                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 596                                         ? True
 597                                         : False));
 598         }
 599
 600         if (context->internal->smb_encryption_level) {
 601                 /* Attempt UNIX smb encryption. */
 602                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 603                                                           username_used,
 604                                                           *pp_password,
 605                                                           *pp_workgroup))) {
 606
 607                         /*
 608                          * context->smb_encryption_level == 1
 609                          * means don't fail if encryption can't be negotiated,
 610                          * == 2 means fail if encryption can't be negotiated.
 611                          */
 612
 613                         DEBUG(4,(" SMB encrypt failed\n"));
 614
 615                         if (context->internal->smb_encryption_level == 2) {
 616                                 cli_shutdown(c);
 617                                 errno = EPERM;
 618                                 return NULL;
 619                         }
 620                 }
 621                 DEBUG(4,(" SMB encrypt ok\n"));
 622         }
 623
 624         /*
 625          * Ok, we have got a nice connection
 626          * Let's allocate a server structure.
 627          */
 628
 629         srv = SMB_MALLOC_P(SMBCSRV);
 630         if (!srv) {
 631                 cli_shutdown(c);
 632                 errno = ENOMEM;
 633                 return NULL;
 634         }
 635
 636         ZERO_STRUCTP(srv);
 637         srv->cli = c;
 638         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 639         srv->no_pathinfo = False;
 640         srv->no_pathinfo2 = False;
 641         srv->no_nt_session = False;
 642
 643 done:
 644         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 645                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 646         } else {
 647                 workgroup = *pp_workgroup;
 648         }
 649         if(!workgroup) {
 650                 return NULL;
 651         }
 652
 653         /* set the credentials to make DFS work */
 654         smbc_set_credentials_with_fallback(context,
 655                                            workgroup,
 656                                            *pp_username,
 657                                            *pp_password);
 658
 659         return srv;
 660 }
 661
 662 SMBCSRV *
 663 SMBC_server(TALLOC_CTX *ctx,
 664                 SMBCCTX *context,
 665                 bool connect_if_not_found,
 666                 const char *server,
 667                 const char *share,
 668                 char **pp_workgroup,
 669                 char **pp_username,
 670                 char **pp_password)
 671 {
 672         SMBCSRV *srv=NULL;
 673         bool in_cache = false;
 674
 675         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 676                         server, share, pp_workgroup,
 677                         pp_username, pp_password, &in_cache);
 678
 679         if (!srv) {
 680                 return NULL;
 681         }
 682         if (in_cache) {
 683                 return srv;
 684         }
 685
 686         /* Now add it to the cache (internal or external)  */
 687         /* Let the cache function set errno if it wants to */
 688         errno = 0;
 689         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 690                                                 server, share,
 691                                                 *pp_workgroup,
 692                                                 *pp_username)) {
 693                 int saved_errno = errno;
 694                 DEBUG(3, (" Failed to add server to cache\n"));
 695                 errno = saved_errno;
 696                 if (errno == 0) {
 697                         errno = ENOMEM;
 698                 }
 699                 SAFE_FREE(srv);
 700                 return NULL;
 701         }
 702
 703         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 704                 server, share, srv));
 705
 706         DLIST_ADD(context->internal->servers, srv);
 707         return srv;
 708 }
 709
 710 /*
 711  * Connect to a server for getting/setting attributes, possibly on an existing
 712  * connection.  This works similarly to SMBC_server().
 713  */
 714 SMBCSRV *
 715 SMBC_attr_server(TALLOC_CTX *ctx,
 716                  SMBCCTX *context,
 717                  const char *server,
 718                  const char *share,
 719                  char **pp_workgroup,
 720                  char **pp_username,
 721                  char **pp_password)
 722 {
 723         int flags;
 724         struct sockaddr_storage ss;
 725         struct cli_state *ipc_cli = NULL;
 726         struct rpc_pipe_client *pipe_hnd = NULL;
 727         NTSTATUS nt_status;
 728         SMBCSRV *srv=NULL;
 729         SMBCSRV *ipc_srv=NULL;
 730
 731         /*
 732          * Use srv->cli->desthost and srv->cli->share instead of
 733          * server and share below to connect to the actual share,
 734          * i.e., a normal share or a referred share from
 735          * 'msdfs proxy' share.
 736          */
 737         srv = SMBC_server(ctx, context, true, server, share,
 738                         pp_workgroup, pp_username, pp_password);
 739         if (!srv) {
 740                 return NULL;
 741         }
 742         server = srv->cli->desthost;
 743         share = srv->cli->share;
 744
 745         /*
 746          * See if we've already created this special connection.  Reference
 747          * our "special" share name '*IPC$', which is an impossible real share
 748          * name due to the leading asterisk.
 749          */
 750         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 751                                    pp_workgroup, pp_username, pp_password);
 752         if (!ipc_srv) {
 753
 754                 /* We didn't find a cached connection.  Get the password */
 755                 if (!*pp_password || (*pp_password)[0] == '\0') {
 756                         /* ... then retrieve it now. */
 757                         SMBC_call_auth_fn(ctx, context, server, share,
 758                                           pp_workgroup,
 759                                           pp_username,
 760                                           pp_password);
 761                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 762                                 errno = ENOMEM;
 763                                 return NULL;
 764                         }
 765                 }
 766
 767                 flags = 0;
 768                 if (smbc_getOptionUseKerberos(context)) {
 769                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 770                 }
 771                 if (smbc_getOptionUseCCache(context)) {
 772                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 773                 }
 774
 775                 zero_sockaddr(&ss);
 776                 nt_status = cli_full_connection(&ipc_cli,
 777                                                 global_myname(), server,
 778                                                 &ss, 0, "IPC$", "?????",
 779                                                 *pp_username,
 780                                                 *pp_workgroup,
 781                                                 *pp_password,
 782                                                 flags,
 783                                                 Undefined);
 784                 if (! NT_STATUS_IS_OK(nt_status)) {
 785                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 786                                  nt_errstr(nt_status)));
 787                         errno = ENOTSUP;
 788                         return NULL;
 789                 }
 790
 791                 if (context->internal->smb_encryption_level) {
 792                         /* Attempt UNIX smb encryption. */
 793                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 794                                                                   *pp_username,
 795                                                                   *pp_password,
 796                                                                   *pp_workgroup))) {
 797
 798                                 /*
 799                                  * context->smb_encryption_level ==
 800                                  * 1 means don't fail if encryption can't be
 801                                  * negotiated, == 2 means fail if encryption
 802                                  * can't be negotiated.
 803                                  */
 804
 805                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 806
 807                                 if (context->internal->smb_encryption_level == 2) {
 808                                         cli_shutdown(ipc_cli);
 809                                         errno = EPERM;
 810                                         return NULL;
 811                                 }
 812                         }
 813                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 814                 }
 815
 816                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 817                 if (!ipc_srv) {
 818                         errno = ENOMEM;
 819                         cli_shutdown(ipc_cli);
 820                         return NULL;
 821                 }
 822
 823                 ZERO_STRUCTP(ipc_srv);
 824                 ipc_srv->cli = ipc_cli;
 825
 826                 nt_status = cli_rpc_pipe_open_noauth(
 827                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 828                 if (!NT_STATUS_IS_OK(nt_status)) {
 829                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 830                         errno = ENOTSUP;
 831                         cli_shutdown(ipc_srv->cli);
 832                         free(ipc_srv);
 833                         return NULL;
 834                 }
 835
 836                 /*
 837                  * Some systems don't support
 838                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 839                  * so we might as well do it too.
 840                  */
 841
 842                 nt_status = rpccli_lsa_open_policy(
 843                         pipe_hnd,
 844                         talloc_tos(),
 845                         True,
 846                         GENERIC_EXECUTE_ACCESS,
 847                         &ipc_srv->pol);
 848
 849                 if (!NT_STATUS_IS_OK(nt_status)) {
 850                         errno = SMBC_errno(context, ipc_srv->cli);
 851                         cli_shutdown(ipc_srv->cli);
 852                         return NULL;
 853                 }
 854
 855                 /* now add it to the cache (internal or external) */
 856
 857                 errno = 0;      /* let cache function set errno if it likes */
 858                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 859                                                              server,
 860                                                              "*IPC$",
 861                                                              *pp_workgroup,
 862                                                              *pp_username)) {
 863                         DEBUG(3, (" Failed to add server to cache\n"));
 864                         if (errno == 0) {
 865                                 errno = ENOMEM;
 866                         }
 867                         cli_shutdown(ipc_srv->cli);
 868                         free(ipc_srv);
 869                         return NULL;
 870                 }
 871
 872                 DLIST_ADD(context->internal->servers, ipc_srv);
 873         }
 874
 875         return ipc_srv;
 876 }