source3/libsmb/libsmb_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SMB client library implementation
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Richard Sharpe 2000, 2002
   6    Copyright (C) John Terpstra 2000
   7    Copyright (C) Tom Jansen (Ninja ISD) 2002
   8    Copyright (C) Derrell Lipman 2003-2008
   9    Copyright (C) Jeremy Allison 2007, 2008
  10    Copyright (C) SATOH Fumiyasu <fumiyas@osstech.co.jp> 2009.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "libsmb/libsmb.h"
  28 #include "libsmbclient.h"
  29 #include "libsmb_internal.h"
  30 #include "../librpc/gen_ndr/ndr_lsa.h"
  31 #include "rpc_client/cli_pipe.h"
  32 #include "rpc_client/cli_lsarpc.h"
  33 #include "libcli/security/security.h"
  34 #include "libsmb/nmblib.h"
  35 #include "../libcli/smb/smbXcli_base.h"
  36
  37 /*
  38  * Check a server for being alive and well.
  39  * returns 0 if the server is in shape. Returns 1 on error
  40  *
  41  * Also useable outside libsmbclient to enable external cache
  42  * to do some checks too.
  43  */
  44 int
  45 SMBC_check_server(SMBCCTX * context,
  46                   SMBCSRV * server)
  47 {
  48         time_t now;
  49
  50         if (!cli_state_is_connected(server->cli)) {
  51                 return 1;
  52         }
  53
  54         now = time_mono(NULL);
  55
  56         if (server->last_echo_time == (time_t)0 ||
  57                         now > server->last_echo_time +
  58                                 (server->cli->timeout/1000)) {
  59                 unsigned char data[16] = {0};
  60                 NTSTATUS status = cli_echo(server->cli,
  61                                         1,
  62                                         data_blob_const(data, sizeof(data)));
  63                 if (!NT_STATUS_IS_OK(status)) {
  64                         bool ok = false;
  65                         /*
  66                          * Some SMB2 servers (not Samba or Windows)
  67                          * check the session status on SMB2_ECHO and return
  68                          * NT_STATUS_USER_SESSION_DELETED
  69                          * if the session was not set. That's OK, they still
  70                          * replied.
  71                          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13218
  72                          */
  73                         if (smbXcli_conn_protocol(server->cli->conn) >=
  74                                         PROTOCOL_SMB2_02) {
  75                                 if (NT_STATUS_EQUAL(status,
  76                                             NT_STATUS_USER_SESSION_DELETED)) {
  77                                         ok = true;
  78                                 }
  79                         }
  80                         /*
  81                          * Some NetApp servers return
  82                          * NT_STATUS_INVALID_PARAMETER.That's OK, they still
  83                          * replied.
  84                          * BUG: https://bugzilla.samba.org/show_bug.cgi?id=13007
  85                          */
  86                         if (NT_STATUS_EQUAL(status,
  87                                         NT_STATUS_INVALID_PARAMETER)) {
  88                                 ok = true;
  89                         }
  90                         if (!ok) {
  91                                 return 1;
  92                         }
  93                 }
  94                 server->last_echo_time = now;
  95         }
  96         return 0;
  97 }
  98
  99 /*
 100  * Remove a server from the cached server list it's unused.
 101  * On success, 0 is returned. 1 is returned if the server could not be removed.
 102  *
 103  * Also useable outside libsmbclient
 104  */
 105 int
 106 SMBC_remove_unused_server(SMBCCTX * context,
 107                           SMBCSRV * srv)
 108 {
 109         SMBCFILE * file;
 110
 111         /* are we being fooled ? */
 112         if (!context || !context->internal->initialized || !srv) {
 113                 return 1;
 114         }
 115
 116         /* Check all open files/directories for a relation with this server */
 117         for (file = context->internal->files; file; file = file->next) {
 118                 if (file->srv == srv) {
 119                         /* Still used */
 120                         DEBUG(3, ("smbc_remove_usused_server: "
 121                                   "%p still used by %p.\n",
 122                                   srv, file));
 123                         return 1;
 124                 }
 125         }
 126
 127         DLIST_REMOVE(context->internal->servers, srv);
 128
 129         cli_shutdown(srv->cli);
 130         srv->cli = NULL;
 131
 132         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
 133
 134         smbc_getFunctionRemoveCachedServer(context)(context, srv);
 135
 136         SAFE_FREE(srv);
 137         return 0;
 138 }
 139
 140 /****************************************************************
 141  * Call the auth_fn with fixed size (fstring) buffers.
 142  ***************************************************************/
 143 static void
 144 SMBC_call_auth_fn(TALLOC_CTX *ctx,
 145                   SMBCCTX *context,
 146                   const char *server,
 147                   const char *share,
 148                   char **pp_workgroup,
 149                   char **pp_username,
 150                   char **pp_password)
 151 {
 152         fstring workgroup = { 0 };
 153         fstring username = { 0 };
 154         fstring password = { 0 };
 155         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 156
 157         if (*pp_workgroup != NULL) {
 158                 strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 159         }
 160         if (*pp_username != NULL) {
 161                 strlcpy(username, *pp_username, sizeof(username));
 162         }
 163         if (*pp_password != NULL) {
 164                 strlcpy(password, *pp_password, sizeof(password));
 165         }
 166
 167         /* See if there's an authentication with context function provided */
 168         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 169         if (auth_with_context_fn)
 170         {
 171             (* auth_with_context_fn)(context,
 172                                      server, share,
 173                                      workgroup, sizeof(workgroup),
 174                                      username, sizeof(username),
 175                                      password, sizeof(password));
 176         }
 177         else
 178         {
 179             smbc_getFunctionAuthData(context)(server, share,
 180                                               workgroup, sizeof(workgroup),
 181                                               username, sizeof(username),
 182                                               password, sizeof(password));
 183         }
 184
 185         TALLOC_FREE(*pp_workgroup);
 186         TALLOC_FREE(*pp_username);
 187         TALLOC_FREE(*pp_password);
 188
 189         *pp_workgroup = talloc_strdup(ctx, workgroup);
 190         *pp_username = talloc_strdup(ctx, username);
 191         *pp_password = talloc_strdup(ctx, password);
 192 }
 193
 194
 195 void
 196 SMBC_get_auth_data(const char *server, const char *share,
 197                    char *workgroup_buf, int workgroup_buf_len,
 198                    char *username_buf, int username_buf_len,
 199                    char *password_buf, int password_buf_len)
 200 {
 201         /* Default function just uses provided data.  Nothing to do. */
 202 }
 203
 204
 205
 206 SMBCSRV *
 207 SMBC_find_server(TALLOC_CTX *ctx,
 208                  SMBCCTX *context,
 209                  const char *server,
 210                  const char *share,
 211                  char **pp_workgroup,
 212                  char **pp_username,
 213                  char **pp_password)
 214 {
 215         SMBCSRV *srv;
 216         int auth_called = 0;
 217
 218         if (!pp_workgroup || !pp_username || !pp_password) {
 219                 return NULL;
 220         }
 221
 222 check_server_cache:
 223
 224         srv = smbc_getFunctionGetCachedServer(context)(context,
 225                                                        server, share,
 226                                                        *pp_workgroup,
 227                                                        *pp_username);
 228
 229         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 230                                      !*pp_password || !(*pp_password)[0])) {
 231                 SMBC_call_auth_fn(ctx, context, server, share,
 232                                   pp_workgroup, pp_username, pp_password);
 233
 234                 /*
 235                  * However, smbc_auth_fn may have picked up info relating to
 236                  * an existing connection, so try for an existing connection
 237                  * again ...
 238                  */
 239                 auth_called = 1;
 240                 goto check_server_cache;
 241
 242         }
 243
 244         if (srv) {
 245                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 246                         /*
 247                          * This server is no good anymore
 248                          * Try to remove it and check for more possible
 249                          * servers in the cache
 250                          */
 251                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 252                                                                         srv)) {
 253                                 /*
 254                                  * We could not remove the server completely,
 255                                  * remove it from the cache so we will not get
 256                                  * it again. It will be removed when the last
 257                                  * file/dir is closed.
 258                                  */
 259                                 smbc_getFunctionRemoveCachedServer(context)(context,
 260                                                                             srv);
 261                         }
 262
 263                         /*
 264                          * Maybe there are more cached connections to this
 265                          * server
 266                          */
 267                         goto check_server_cache;
 268                 }
 269
 270                 return srv;
 271         }
 272
 273         return NULL;
 274 }
 275
 276 static struct cli_credentials *SMBC_auth_credentials(TALLOC_CTX *mem_ctx,
 277                                                      SMBCCTX *context,
 278                                                      const char *domain,
 279                                                      const char *username,
 280                                                      const char *password)
 281 {
 282         struct cli_credentials *creds = NULL;
 283         bool use_kerberos = false;
 284         bool fallback_after_kerberos = false;
 285         bool use_ccache = false;
 286         bool pw_nt_hash = false;
 287
 288         use_kerberos = smbc_getOptionUseKerberos(context);
 289         fallback_after_kerberos = smbc_getOptionFallbackAfterKerberos(context);
 290         use_ccache = smbc_getOptionUseCCache(context);
 291         pw_nt_hash = smbc_getOptionUseNTHash(context);
 292
 293         creds = cli_session_creds_init(mem_ctx,
 294                                        username,
 295                                        domain,
 296                                        NULL, /* realm */
 297                                        password,
 298                                        use_kerberos,
 299                                        fallback_after_kerberos,
 300                                        use_ccache,
 301                                        pw_nt_hash);
 302         if (creds == NULL) {
 303                 return NULL;
 304         }
 305
 306         switch (context->internal->smb_encryption_level) {
 307         case SMBC_ENCRYPTLEVEL_DEFAULT:
 308                 /* Use the config option */
 309                 break;
 310         case SMBC_ENCRYPTLEVEL_NONE:
 311                 (void)cli_credentials_set_smb_encryption(
 312                                 creds,
 313                                 SMB_ENCRYPTION_OFF,
 314                                 CRED_SPECIFIED);
 315                 break;
 316         case SMBC_ENCRYPTLEVEL_REQUEST:
 317                 (void)cli_credentials_set_smb_encryption(
 318                                 creds,
 319                                 SMB_ENCRYPTION_DESIRED,
 320                                 CRED_SPECIFIED);
 321                 break;
 322         case SMBC_ENCRYPTLEVEL_REQUIRE:
 323         default:
 324                 (void)cli_credentials_set_smb_encryption(
 325                                 creds,
 326                                 SMB_ENCRYPTION_REQUIRED,
 327                                 CRED_SPECIFIED);
 328                 break;
 329         }
 330
 331
 332         return creds;
 333 }
 334
 335 /*
 336  * Connect to a server, possibly on an existing connection
 337  *
 338  * Here, what we want to do is: If the server and username
 339  * match an existing connection, reuse that, otherwise, establish a
 340  * new connection.
 341  *
 342  * If we have to create a new connection, call the auth_fn to get the
 343  * info we need, unless the username and password were passed in.
 344  */
 345
 346 static SMBCSRV *
 347 SMBC_server_internal(TALLOC_CTX *ctx,
 348             SMBCCTX *context,
 349             bool connect_if_not_found,
 350             const char *server,
 351             uint16_t port,
 352             const char *share,
 353             char **pp_workgroup,
 354             char **pp_username,
 355             char **pp_password,
 356             bool *in_cache)
 357 {
 358         SMBCSRV *srv=NULL;
 359         char *workgroup = NULL;
 360         struct cli_state *c = NULL;
 361         const char *server_n = server;
 362         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 363         uint32_t fs_attrs = 0;
 364         const char *username_used = NULL;
 365         const char *password_used = NULL;
 366         NTSTATUS status;
 367         char *newserver, *newshare;
 368         int flags = 0;
 369         struct smbXcli_tcon *tcon = NULL;
 370         int signing_state = SMB_SIGNING_DEFAULT;
 371         struct cli_credentials *creds = NULL;
 372
 373         *in_cache = false;
 374
 375         if (server[0] == 0) {
 376                 errno = EPERM;
 377                 return NULL;
 378         }
 379
 380         /* Look for a cached connection */
 381         srv = SMBC_find_server(ctx, context, server, share,
 382                                pp_workgroup, pp_username, pp_password);
 383
 384         /*
 385          * If we found a connection and we're only allowed one share per
 386          * server...
 387          */
 388         if (srv &&
 389             share != NULL && *share != '\0' &&
 390             smbc_getOptionOneSharePerServer(context)) {
 391
 392                 /*
 393                  * ... then if there's no current connection to the share,
 394                  * connect to it.  SMBC_find_server(), or rather the function
 395                  * pointed to by context->get_cached_srv_fn which
 396                  * was called by SMBC_find_server(), will have issued a tree
 397                  * disconnect if the requested share is not the same as the
 398                  * one that was already connected.
 399                  */
 400
 401                 /*
 402                  * Use srv->cli->desthost and srv->cli->share instead of
 403                  * server and share below to connect to the actual share,
 404                  * i.e., a normal share or a referred share from
 405                  * 'msdfs proxy' share.
 406                  */
 407                 if (!cli_state_has_tcon(srv->cli)) {
 408                         /* Ensure we have accurate auth info */
 409                         SMBC_call_auth_fn(ctx, context,
 410                                           smbXcli_conn_remote_name(srv->cli->conn),
 411                                           srv->cli->share,
 412                                           pp_workgroup,
 413                                           pp_username,
 414                                           pp_password);
 415
 416                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 417                                 errno = ENOMEM;
 418                                 cli_shutdown(srv->cli);
 419                                 srv->cli = NULL;
 420                                 smbc_getFunctionRemoveCachedServer(context)(context,
 421                                                                             srv);
 422                                 return NULL;
 423                         }
 424
 425                         /*
 426                          * We don't need to renegotiate encryption
 427                          * here as the encryption context is not per
 428                          * tid.
 429                          */
 430
 431                         status = cli_tree_connect(srv->cli,
 432                                                   srv->cli->share,
 433                                                   "?????",
 434                                                   *pp_password);
 435                         if (!NT_STATUS_IS_OK(status)) {
 436                                 cli_shutdown(srv->cli);
 437                                 errno = map_errno_from_nt_status(status);
 438                                 srv->cli = NULL;
 439                                 smbc_getFunctionRemoveCachedServer(context)(context,
 440                                                                             srv);
 441                                 srv = NULL;
 442                                 goto not_found;
 443                         }
 444
 445                         /* Determine if this share supports case sensitivity */
 446                         if (is_ipc) {
 447                                 DEBUG(4,
 448                                       ("IPC$ so ignore case sensitivity\n"));
 449                                 status = NT_STATUS_OK;
 450                         } else {
 451                                 status = cli_get_fs_attr_info(srv->cli, &fs_attrs);
 452                         }
 453
 454                         if (!NT_STATUS_IS_OK(status)) {
 455                                 DEBUG(4, ("Could not retrieve "
 456                                           "case sensitivity flag: %s.\n",
 457                                           nt_errstr(status)));
 458
 459                                 /*
 460                                  * We can't determine the case sensitivity of
 461                                  * the share. We have no choice but to use the
 462                                  * user-specified case sensitivity setting.
 463                                  */
 464                                 if (smbc_getOptionCaseSensitive(context)) {
 465                                         cli_set_case_sensitive(srv->cli, true);
 466                                 } else {
 467                                         cli_set_case_sensitive(srv->cli, false);
 468                                 }
 469                         } else if (!is_ipc) {
 470                                 DEBUG(4,
 471                                       ("Case sensitive: %s\n",
 472                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 473                                         ? "True"
 474                                         : "False")));
 475                                 cli_set_case_sensitive(
 476                                         srv->cli,
 477                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 478                                          ? True
 479                                          : False));
 480                         }
 481
 482                         /*
 483                          * Regenerate the dev value since it's based on both
 484                          * server and share
 485                          */
 486                         if (srv) {
 487                                 const char *remote_name =
 488                                         smbXcli_conn_remote_name(srv->cli->conn);
 489
 490                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 491                                                    str_checksum(srv->cli->share));
 492                         }
 493                 }
 494         }
 495
 496  not_found:
 497
 498         /* If we have a connection... */
 499         if (srv) {
 500
 501                 /* ... then we're done here.  Give 'em what they came for. */
 502                 *in_cache = true;
 503                 goto done;
 504         }
 505
 506         /* If we're not asked to connect when a connection doesn't exist... */
 507         if (! connect_if_not_found) {
 508                 /* ... then we're done here. */
 509                 return NULL;
 510         }
 511
 512         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 513                 errno = ENOMEM;
 514                 return NULL;
 515         }
 516
 517         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 518
 519         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 520
 521         status = NT_STATUS_UNSUCCESSFUL;
 522
 523         if (context->internal->smb_encryption_level > SMBC_ENCRYPTLEVEL_NONE) {
 524                 signing_state = SMB_SIGNING_REQUIRED;
 525         }
 526
 527         if (port == 0) {
 528                 if (share == NULL || *share == '\0' || is_ipc) {
 529                         /*
 530                          * Try 139 first for IPC$
 531                          */
 532                         status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 533                                         smbc_getNetbiosName(context),
 534                                         signing_state, flags, &c);
 535                 }
 536         }
 537
 538         if (!NT_STATUS_IS_OK(status)) {
 539                 /*
 540                  * No IPC$ or 139 did not work
 541                  */
 542                 status = cli_connect_nb(server_n, NULL, port, 0x20,
 543                                         smbc_getNetbiosName(context),
 544                                         signing_state, flags, &c);
 545         }
 546
 547         if (!NT_STATUS_IS_OK(status)) {
 548                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 549                         DBG_ERR("NetBIOS support disabled, unable to connect");
 550                 }
 551
 552                 errno = map_errno_from_nt_status(status);
 553                 return NULL;
 554         }
 555
 556         cli_set_timeout(c, smbc_getTimeout(context));
 557
 558         status = smbXcli_negprot(c->conn, c->timeout,
 559                                  lp_client_min_protocol(),
 560                                  lp_client_max_protocol());
 561         if (!NT_STATUS_IS_OK(status)) {
 562                 cli_shutdown(c);
 563                 errno = map_errno_from_nt_status(status);
 564                 return NULL;
 565         }
 566
 567         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 568                 /* Ensure we ask for some initial credits. */
 569                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 570         }
 571
 572         username_used = *pp_username;
 573         password_used = *pp_password;
 574
 575         creds = SMBC_auth_credentials(c,
 576                                       context,
 577                                       *pp_workgroup,
 578                                       username_used,
 579                                       password_used);
 580         if (creds == NULL) {
 581                 cli_shutdown(c);
 582                 errno = ENOMEM;
 583                 return NULL;
 584         }
 585
 586         status = cli_session_setup_creds(c, creds);
 587         if (!NT_STATUS_IS_OK(status)) {
 588
 589                 /* Failed.  Try an anonymous login, if allowed by flags. */
 590                 username_used = "";
 591                 password_used = "";
 592
 593                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 594                     !NT_STATUS_IS_OK(cli_session_setup_anon(c))) {
 595
 596                         cli_shutdown(c);
 597                         errno = map_errno_from_nt_status(status);
 598                         return NULL;
 599                 }
 600         }
 601
 602         DEBUG(4,(" session setup ok\n"));
 603
 604         /* here's the fun part....to support 'msdfs proxy' shares
 605            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 606            here before trying to connect to the original share.
 607            cli_check_msdfs_proxy() will fail if it is a normal share. */
 608
 609         if (smbXcli_conn_dfs_supported(c->conn) &&
 610                         cli_check_msdfs_proxy(ctx, c, share,
 611                                 &newserver, &newshare,
 612                                 creds)) {
 613                 cli_shutdown(c);
 614                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 615                                 newserver, port, newshare, pp_workgroup,
 616                                 pp_username, pp_password, in_cache);
 617                 TALLOC_FREE(newserver);
 618                 TALLOC_FREE(newshare);
 619                 return srv;
 620         }
 621
 622         /* must be a normal share */
 623
 624         status = cli_tree_connect_creds(c, share, "?????", creds);
 625         if (!NT_STATUS_IS_OK(status)) {
 626                 cli_shutdown(c);
 627                 errno = map_errno_from_nt_status(status);
 628                 return NULL;
 629         }
 630
 631         DEBUG(4,(" tconx ok\n"));
 632
 633         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 634                 tcon = c->smb2.tcon;
 635         } else {
 636                 tcon = c->smb1.tcon;
 637         }
 638
 639         /* Determine if this share supports case sensitivity */
 640         if (is_ipc) {
 641                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 642                 status = NT_STATUS_OK;
 643         } else {
 644                 status = cli_get_fs_attr_info(c, &fs_attrs);
 645         }
 646
 647         if (!NT_STATUS_IS_OK(status)) {
 648                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 649                           nt_errstr(status)));
 650
 651                 /*
 652                  * We can't determine the case sensitivity of the share. We
 653                  * have no choice but to use the user-specified case
 654                  * sensitivity setting.
 655                  */
 656                 if (smbc_getOptionCaseSensitive(context)) {
 657                         cli_set_case_sensitive(c, True);
 658                 } else {
 659                         cli_set_case_sensitive(c, False);
 660                 }
 661         } else if (!is_ipc) {
 662                 DEBUG(4, ("Case sensitive: %s\n",
 663                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 664                            ? "True"
 665                            : "False")));
 666                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 667         }
 668
 669         /*
 670          * Ok, we have got a nice connection
 671          * Let's allocate a server structure.
 672          */
 673
 674         srv = SMB_MALLOC_P(SMBCSRV);
 675         if (!srv) {
 676                 cli_shutdown(c);
 677                 errno = ENOMEM;
 678                 return NULL;
 679         }
 680
 681         ZERO_STRUCTP(srv);
 682         DLIST_ADD(srv->cli, c);
 683         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 684         srv->no_pathinfo = False;
 685         srv->no_pathinfo2 = False;
 686         srv->no_pathinfo3 = False;
 687         srv->no_nt_session = False;
 688
 689 done:
 690         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 691                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 692         } else {
 693                 workgroup = *pp_workgroup;
 694         }
 695         if(!workgroup) {
 696                 if (c != NULL) {
 697                         cli_shutdown(c);
 698                 }
 699                 SAFE_FREE(srv);
 700                 return NULL;
 701         }
 702
 703         /* set the credentials to make DFS work */
 704         smbc_set_credentials_with_fallback(context,
 705                                            workgroup,
 706                                            *pp_username,
 707                                            *pp_password);
 708
 709         return srv;
 710 }
 711
 712 SMBCSRV *
 713 SMBC_server(TALLOC_CTX *ctx,
 714                 SMBCCTX *context,
 715                 bool connect_if_not_found,
 716                 const char *server,
 717                 uint16_t port,
 718                 const char *share,
 719                 char **pp_workgroup,
 720                 char **pp_username,
 721                 char **pp_password)
 722 {
 723         SMBCSRV *srv=NULL;
 724         bool in_cache = false;
 725
 726         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 727                         server, port, share, pp_workgroup,
 728                         pp_username, pp_password, &in_cache);
 729
 730         if (!srv) {
 731                 return NULL;
 732         }
 733         if (in_cache) {
 734                 return srv;
 735         }
 736
 737         /* Now add it to the cache (internal or external)  */
 738         /* Let the cache function set errno if it wants to */
 739         errno = 0;
 740         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 741                                                 server, share,
 742                                                 *pp_workgroup,
 743                                                 *pp_username)) {
 744                 int saved_errno = errno;
 745                 DEBUG(3, (" Failed to add server to cache\n"));
 746                 errno = saved_errno;
 747                 if (errno == 0) {
 748                         errno = ENOMEM;
 749                 }
 750                 SAFE_FREE(srv);
 751                 return NULL;
 752         }
 753
 754         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 755                 server, share, srv));
 756
 757         DLIST_ADD(context->internal->servers, srv);
 758         return srv;
 759 }
 760
 761 /*
 762  * Connect to a server for getting/setting attributes, possibly on an existing
 763  * connection.  This works similarly to SMBC_server().
 764  */
 765 SMBCSRV *
 766 SMBC_attr_server(TALLOC_CTX *ctx,
 767                  SMBCCTX *context,
 768                  const char *server,
 769                  uint16_t port,
 770                  const char *share,
 771                  char **pp_workgroup,
 772                  char **pp_username,
 773                  char **pp_password)
 774 {
 775         int flags;
 776         struct cli_state *ipc_cli = NULL;
 777         struct rpc_pipe_client *pipe_hnd = NULL;
 778         NTSTATUS nt_status;
 779         SMBCSRV *srv=NULL;
 780         SMBCSRV *ipc_srv=NULL;
 781
 782         /*
 783          * Use srv->cli->desthost and srv->cli->share instead of
 784          * server and share below to connect to the actual share,
 785          * i.e., a normal share or a referred share from
 786          * 'msdfs proxy' share.
 787          */
 788         srv = SMBC_server(ctx, context, true, server, port, share,
 789                         pp_workgroup, pp_username, pp_password);
 790         if (!srv) {
 791                 return NULL;
 792         }
 793         server = smbXcli_conn_remote_name(srv->cli->conn);
 794         share = srv->cli->share;
 795
 796         /*
 797          * See if we've already created this special connection.  Reference
 798          * our "special" share name '*IPC$', which is an impossible real share
 799          * name due to the leading asterisk.
 800          */
 801         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 802                                    pp_workgroup, pp_username, pp_password);
 803         if (!ipc_srv) {
 804                 struct cli_credentials *creds = NULL;
 805
 806                 /* We didn't find a cached connection.  Get the password */
 807                 if (!*pp_password || (*pp_password)[0] == '\0') {
 808                         /* ... then retrieve it now. */
 809                         SMBC_call_auth_fn(ctx, context, server, share,
 810                                           pp_workgroup,
 811                                           pp_username,
 812                                           pp_password);
 813                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 814                                 errno = ENOMEM;
 815                                 return NULL;
 816                         }
 817                 }
 818
 819                 flags = 0;
 820
 821                 creds = SMBC_auth_credentials(NULL,
 822                                               context,
 823                                               *pp_workgroup,
 824                                               *pp_username,
 825                                               *pp_password);
 826                 if (creds == NULL) {
 827                         errno = ENOMEM;
 828                         return NULL;
 829                 }
 830
 831                 nt_status = cli_full_connection_creds(&ipc_cli,
 832                                                 lp_netbios_name(), server,
 833                                                 NULL, 0, "IPC$", "?????",
 834                                                 creds,
 835                                                 flags);
 836                 if (! NT_STATUS_IS_OK(nt_status)) {
 837                         TALLOC_FREE(creds);
 838                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 839                                  nt_errstr(nt_status)));
 840                         errno = ENOTSUP;
 841                         return NULL;
 842                 }
 843                 talloc_steal(ipc_cli, creds);
 844
 845                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 846                 if (!ipc_srv) {
 847                         errno = ENOMEM;
 848                         cli_shutdown(ipc_cli);
 849                         return NULL;
 850                 }
 851
 852                 ZERO_STRUCTP(ipc_srv);
 853                 DLIST_ADD(ipc_srv->cli, ipc_cli);
 854
 855                 nt_status = cli_rpc_pipe_open_noauth(
 856                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 857                 if (!NT_STATUS_IS_OK(nt_status)) {
 858                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 859                         errno = ENOTSUP;
 860                         cli_shutdown(ipc_srv->cli);
 861                         free(ipc_srv);
 862                         return NULL;
 863                 }
 864
 865                 /*
 866                  * Some systems don't support
 867                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 868                  * so we might as well do it too.
 869                  */
 870
 871                 nt_status = rpccli_lsa_open_policy(
 872                         pipe_hnd,
 873                         talloc_tos(),
 874                         True,
 875                         GENERIC_EXECUTE_ACCESS,
 876                         &ipc_srv->pol);
 877
 878                 if (!NT_STATUS_IS_OK(nt_status)) {
 879                         cli_shutdown(ipc_srv->cli);
 880                         free(ipc_srv);
 881                         errno = cli_status_to_errno(nt_status);
 882                         return NULL;
 883                 }
 884
 885                 /* now add it to the cache (internal or external) */
 886
 887                 errno = 0;      /* let cache function set errno if it likes */
 888                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 889                                                              server,
 890                                                              "*IPC$",
 891                                                              *pp_workgroup,
 892                                                              *pp_username)) {
 893                         DEBUG(3, (" Failed to add server to cache\n"));
 894                         if (errno == 0) {
 895                                 errno = ENOMEM;
 896                         }
 897                         cli_shutdown(ipc_srv->cli);
 898                         free(ipc_srv);
 899                         return NULL;
 900                 }
 901
 902                 DLIST_ADD(context->internal->servers, ipc_srv);
 903         }
 904
 905         return ipc_srv;
 906 }