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