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 usable 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 usable 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(NULL,
 533                                                 server_n,
 534                                                 NULL,
 535                                                 NBT_SMB_PORT,
 536                                                 0x20,
 537                                                 smbc_getNetbiosName(context),
 538                                                 signing_state,
 539                                                 flags,
 540                                                 &c);
 541                 }
 542         }
 543
 544         if (!NT_STATUS_IS_OK(status)) {
 545                 /*
 546                  * No IPC$ or 139 did not work
 547                  */
 548                 status = cli_connect_nb(NULL,
 549                                         server_n,
 550                                         NULL,
 551                                         port,
 552                                         0x20,
 553                                         smbc_getNetbiosName(context),
 554                                         signing_state,
 555                                         flags,
 556                                         &c);
 557         }
 558
 559         if (!NT_STATUS_IS_OK(status)) {
 560                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 561                         DBG_ERR("NetBIOS support disabled, unable to connect\n");
 562                 }
 563
 564                 errno = map_errno_from_nt_status(status);
 565                 return NULL;
 566         }
 567
 568         cli_set_timeout(c, smbc_getTimeout(context));
 569
 570         status = smbXcli_negprot(c->conn,
 571                                  c->timeout,
 572                                  lp_client_min_protocol(),
 573                                  lp_client_max_protocol(),
 574                                  NULL,
 575                                  NULL,
 576                                  NULL);
 577         if (!NT_STATUS_IS_OK(status)) {
 578                 cli_shutdown(c);
 579                 errno = map_errno_from_nt_status(status);
 580                 return NULL;
 581         }
 582
 583         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 584                 /* Ensure we ask for some initial credits. */
 585                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 586         }
 587
 588         username_used = *pp_username;
 589         password_used = *pp_password;
 590
 591         creds = SMBC_auth_credentials(c,
 592                                       context,
 593                                       *pp_workgroup,
 594                                       username_used,
 595                                       password_used);
 596         if (creds == NULL) {
 597                 cli_shutdown(c);
 598                 errno = ENOMEM;
 599                 return NULL;
 600         }
 601
 602         status = cli_session_setup_creds(c, creds);
 603         if (!NT_STATUS_IS_OK(status)) {
 604
 605                 /* Failed.  Try an anonymous login, if allowed by flags. */
 606                 username_used = "";
 607                 password_used = "";
 608
 609                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 610                     !NT_STATUS_IS_OK(cli_session_setup_anon(c))) {
 611
 612                         cli_shutdown(c);
 613                         errno = map_errno_from_nt_status(status);
 614                         return NULL;
 615                 }
 616         }
 617
 618         DEBUG(4,(" session setup ok\n"));
 619
 620         /* here's the fun part....to support 'msdfs proxy' shares
 621            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 622            here before trying to connect to the original share.
 623            cli_check_msdfs_proxy() will fail if it is a normal share. */
 624
 625         if (smbXcli_conn_dfs_supported(c->conn) &&
 626                         cli_check_msdfs_proxy(ctx, c, share,
 627                                 &newserver, &newshare,
 628                                 creds)) {
 629                 cli_shutdown(c);
 630                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 631                                 newserver, port, newshare, pp_workgroup,
 632                                 pp_username, pp_password, in_cache);
 633                 TALLOC_FREE(newserver);
 634                 TALLOC_FREE(newshare);
 635                 return srv;
 636         }
 637
 638         /* must be a normal share */
 639
 640         status = cli_tree_connect_creds(c, share, "?????", creds);
 641         if (!NT_STATUS_IS_OK(status)) {
 642                 cli_shutdown(c);
 643                 errno = map_errno_from_nt_status(status);
 644                 return NULL;
 645         }
 646
 647         DEBUG(4,(" tconx ok\n"));
 648
 649         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 650                 tcon = c->smb2.tcon;
 651         } else {
 652                 tcon = c->smb1.tcon;
 653         }
 654
 655         /* Determine if this share supports case sensitivity */
 656         if (is_ipc) {
 657                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 658                 status = NT_STATUS_OK;
 659         } else {
 660                 status = cli_get_fs_attr_info(c, &fs_attrs);
 661         }
 662
 663         if (!NT_STATUS_IS_OK(status)) {
 664                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 665                           nt_errstr(status)));
 666
 667                 /*
 668                  * We can't determine the case sensitivity of the share. We
 669                  * have no choice but to use the user-specified case
 670                  * sensitivity setting.
 671                  */
 672                 if (smbc_getOptionCaseSensitive(context)) {
 673                         cli_set_case_sensitive(c, True);
 674                 } else {
 675                         cli_set_case_sensitive(c, False);
 676                 }
 677         } else if (!is_ipc) {
 678                 DEBUG(4, ("Case sensitive: %s\n",
 679                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 680                            ? "True"
 681                            : "False")));
 682                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 683         }
 684
 685         /*
 686          * Ok, we have got a nice connection
 687          * Let's allocate a server structure.
 688          */
 689
 690         srv = SMB_MALLOC_P(SMBCSRV);
 691         if (!srv) {
 692                 cli_shutdown(c);
 693                 errno = ENOMEM;
 694                 return NULL;
 695         }
 696
 697         ZERO_STRUCTP(srv);
 698         DLIST_ADD(srv->cli, c);
 699         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 700         srv->no_pathinfo = False;
 701         srv->no_pathinfo2 = False;
 702         srv->no_pathinfo3 = False;
 703         srv->no_nt_session = False;
 704
 705 done:
 706         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 707                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 708         } else {
 709                 workgroup = *pp_workgroup;
 710         }
 711         if(!workgroup) {
 712                 if (c != NULL) {
 713                         cli_shutdown(c);
 714                 }
 715                 SAFE_FREE(srv);
 716                 return NULL;
 717         }
 718
 719         /* set the credentials to make DFS work */
 720         smbc_set_credentials_with_fallback(context,
 721                                            workgroup,
 722                                            *pp_username,
 723                                            *pp_password);
 724
 725         return srv;
 726 }
 727
 728 SMBCSRV *
 729 SMBC_server(TALLOC_CTX *ctx,
 730                 SMBCCTX *context,
 731                 bool connect_if_not_found,
 732                 const char *server,
 733                 uint16_t port,
 734                 const char *share,
 735                 char **pp_workgroup,
 736                 char **pp_username,
 737                 char **pp_password)
 738 {
 739         SMBCSRV *srv=NULL;
 740         bool in_cache = false;
 741
 742         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 743                         server, port, share, pp_workgroup,
 744                         pp_username, pp_password, &in_cache);
 745
 746         if (!srv) {
 747                 return NULL;
 748         }
 749         if (in_cache) {
 750                 return srv;
 751         }
 752
 753         /* Now add it to the cache (internal or external)  */
 754         /* Let the cache function set errno if it wants to */
 755         errno = 0;
 756         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 757                                                 server, share,
 758                                                 *pp_workgroup,
 759                                                 *pp_username)) {
 760                 int saved_errno = errno;
 761                 DEBUG(3, (" Failed to add server to cache\n"));
 762                 errno = saved_errno;
 763                 if (errno == 0) {
 764                         errno = ENOMEM;
 765                 }
 766                 SAFE_FREE(srv);
 767                 return NULL;
 768         }
 769
 770         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 771                 server, share, srv));
 772
 773         DLIST_ADD(context->internal->servers, srv);
 774         return srv;
 775 }
 776
 777 /*
 778  * Connect to a server for getting/setting attributes, possibly on an existing
 779  * connection.  This works similarly to SMBC_server().
 780  */
 781 SMBCSRV *
 782 SMBC_attr_server(TALLOC_CTX *ctx,
 783                  SMBCCTX *context,
 784                  const char *server,
 785                  uint16_t port,
 786                  const char *share,
 787                  char **pp_workgroup,
 788                  char **pp_username,
 789                  char **pp_password)
 790 {
 791         int flags;
 792         struct cli_state *ipc_cli = NULL;
 793         struct rpc_pipe_client *pipe_hnd = NULL;
 794         NTSTATUS nt_status;
 795         SMBCSRV *srv=NULL;
 796         SMBCSRV *ipc_srv=NULL;
 797
 798         /*
 799          * Use srv->cli->desthost and srv->cli->share instead of
 800          * server and share below to connect to the actual share,
 801          * i.e., a normal share or a referred share from
 802          * 'msdfs proxy' share.
 803          */
 804         srv = SMBC_server(ctx, context, true, server, port, share,
 805                         pp_workgroup, pp_username, pp_password);
 806         if (!srv) {
 807                 return NULL;
 808         }
 809         server = smbXcli_conn_remote_name(srv->cli->conn);
 810         share = srv->cli->share;
 811
 812         /*
 813          * See if we've already created this special connection.  Reference
 814          * our "special" share name '*IPC$', which is an impossible real share
 815          * name due to the leading asterisk.
 816          */
 817         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 818                                    pp_workgroup, pp_username, pp_password);
 819         if (!ipc_srv) {
 820                 struct cli_credentials *creds = NULL;
 821
 822                 /* We didn't find a cached connection.  Get the password */
 823                 if (!*pp_password || (*pp_password)[0] == '\0') {
 824                         /* ... then retrieve it now. */
 825                         SMBC_call_auth_fn(ctx, context, server, share,
 826                                           pp_workgroup,
 827                                           pp_username,
 828                                           pp_password);
 829                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 830                                 errno = ENOMEM;
 831                                 return NULL;
 832                         }
 833                 }
 834
 835                 flags = 0;
 836
 837                 creds = SMBC_auth_credentials(NULL,
 838                                               context,
 839                                               *pp_workgroup,
 840                                               *pp_username,
 841                                               *pp_password);
 842                 if (creds == NULL) {
 843                         errno = ENOMEM;
 844                         return NULL;
 845                 }
 846
 847                 nt_status = cli_full_connection_creds(NULL,
 848                                                       &ipc_cli,
 849                                                       lp_netbios_name(),
 850                                                       server,
 851                                                       NULL,
 852                                                       0,
 853                                                       "IPC$",
 854                                                       "?????",
 855                                                       creds,
 856                                                       flags);
 857                 if (! NT_STATUS_IS_OK(nt_status)) {
 858                         TALLOC_FREE(creds);
 859                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 860                                  nt_errstr(nt_status)));
 861                         errno = ENOTSUP;
 862                         return NULL;
 863                 }
 864                 talloc_steal(ipc_cli, creds);
 865
 866                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 867                 if (!ipc_srv) {
 868                         errno = ENOMEM;
 869                         cli_shutdown(ipc_cli);
 870                         return NULL;
 871                 }
 872
 873                 ZERO_STRUCTP(ipc_srv);
 874                 DLIST_ADD(ipc_srv->cli, ipc_cli);
 875
 876                 nt_status = cli_rpc_pipe_open_noauth(
 877                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 878                 if (!NT_STATUS_IS_OK(nt_status)) {
 879                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 880                         errno = ENOTSUP;
 881                         cli_shutdown(ipc_srv->cli);
 882                         free(ipc_srv);
 883                         return NULL;
 884                 }
 885
 886                 /*
 887                  * Some systems don't support
 888                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 889                  * so we might as well do it too.
 890                  */
 891
 892                 nt_status = rpccli_lsa_open_policy(
 893                         pipe_hnd,
 894                         talloc_tos(),
 895                         True,
 896                         GENERIC_EXECUTE_ACCESS,
 897                         &ipc_srv->pol);
 898
 899                 if (!NT_STATUS_IS_OK(nt_status)) {
 900                         cli_shutdown(ipc_srv->cli);
 901                         free(ipc_srv);
 902                         errno = cli_status_to_errno(nt_status);
 903                         return NULL;
 904                 }
 905
 906                 /* now add it to the cache (internal or external) */
 907
 908                 errno = 0;      /* let cache function set errno if it likes */
 909                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 910                                                              server,
 911                                                              "*IPC$",
 912                                                              *pp_workgroup,
 913                                                              *pp_username)) {
 914                         DEBUG(3, (" Failed to add server to cache\n"));
 915                         if (errno == 0) {
 916                                 errno = ENOMEM;
 917                         }
 918                         cli_shutdown(ipc_srv->cli);
 919                         free(ipc_srv);
 920                         return NULL;
 921                 }
 922
 923                 DLIST_ADD(context->internal->servers, ipc_srv);
 924         }
 925
 926         return ipc_srv;
 927 }