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