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                 if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_SUPPORTED)) {
 493                         DBG_ERR("NetBIOS support disabled, unable to connect");
 494                 }
 495
 496                 errno = map_errno_from_nt_status(status);
 497                 return NULL;
 498         }
 499
 500         cli_set_timeout(c, smbc_getTimeout(context));
 501
 502         status = smbXcli_negprot(c->conn, c->timeout,
 503                                  lp_client_min_protocol(),
 504                                  lp_client_max_protocol());
 505         if (!NT_STATUS_IS_OK(status)) {
 506                 cli_shutdown(c);
 507                 errno = map_errno_from_nt_status(status);
 508                 return NULL;
 509         }
 510
 511         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 512                 /* Ensure we ask for some initial credits. */
 513                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 514         }
 515
 516         username_used = *pp_username;
 517         password_used = *pp_password;
 518
 519         creds = cli_session_creds_init(c,
 520                                        username_used,
 521                                        *pp_workgroup,
 522                                        NULL, /* realm */
 523                                        password_used,
 524                                        use_kerberos,
 525                                        fallback_after_kerberos,
 526                                        use_ccache,
 527                                        pw_nt_hash);
 528         if (creds == NULL) {
 529                 cli_shutdown(c);
 530                 errno = ENOMEM;
 531                 return NULL;
 532         }
 533
 534         status = cli_session_setup_creds(c, creds);
 535         if (!NT_STATUS_IS_OK(status)) {
 536
 537                 /* Failed.  Try an anonymous login, if allowed by flags. */
 538                 username_used = "";
 539                 password_used = "";
 540
 541                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 542                     !NT_STATUS_IS_OK(cli_session_setup_anon(c))) {
 543
 544                         cli_shutdown(c);
 545                         errno = EPERM;
 546                         return NULL;
 547                 }
 548         }
 549
 550         DEBUG(4,(" session setup ok\n"));
 551
 552         /* here's the fun part....to support 'msdfs proxy' shares
 553            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 554            here before trying to connect to the original share.
 555            cli_check_msdfs_proxy() will fail if it is a normal share. */
 556
 557         if (smbXcli_conn_dfs_supported(c->conn) &&
 558                         cli_check_msdfs_proxy(ctx, c, share,
 559                                 &newserver, &newshare,
 560                                 /* FIXME: cli_check_msdfs_proxy() does
 561                                    not support smbc_smb_encrypt_level type */
 562                                 context->internal->smb_encryption_level ?
 563                                         true : false,
 564                                 creds)) {
 565                 cli_shutdown(c);
 566                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 567                                 newserver, port, newshare, pp_workgroup,
 568                                 pp_username, pp_password, in_cache);
 569                 TALLOC_FREE(newserver);
 570                 TALLOC_FREE(newshare);
 571                 return srv;
 572         }
 573
 574         /* must be a normal share */
 575
 576         status = cli_tree_connect_creds(c, share, "?????", creds);
 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         DEBUG(4,(" tconx ok\n"));
 584
 585         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 586                 tcon = c->smb2.tcon;
 587         } else {
 588                 tcon = c->smb1.tcon;
 589         }
 590
 591         /* Determine if this share supports case sensitivity */
 592         if (is_ipc) {
 593                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 594                 status = NT_STATUS_OK;
 595         } else {
 596                 status = cli_get_fs_attr_info(c, &fs_attrs);
 597         }
 598
 599         if (!NT_STATUS_IS_OK(status)) {
 600                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 601                           nt_errstr(status)));
 602
 603                 /*
 604                  * We can't determine the case sensitivity of the share. We
 605                  * have no choice but to use the user-specified case
 606                  * sensitivity setting.
 607                  */
 608                 if (smbc_getOptionCaseSensitive(context)) {
 609                         cli_set_case_sensitive(c, True);
 610                 } else {
 611                         cli_set_case_sensitive(c, False);
 612                 }
 613         } else if (!is_ipc) {
 614                 DEBUG(4, ("Case sensitive: %s\n",
 615                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 616                            ? "True"
 617                            : "False")));
 618                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 619         }
 620
 621         if (context->internal->smb_encryption_level) {
 622                 /* Attempt encryption. */
 623                 status = cli_cm_force_encryption_creds(c,
 624                                                        creds,
 625                                                        share);
 626                 if (!NT_STATUS_IS_OK(status)) {
 627
 628                         /*
 629                          * context->smb_encryption_level == 1
 630                          * means don't fail if encryption can't be negotiated,
 631                          * == 2 means fail if encryption can't be negotiated.
 632                          */
 633
 634                         DEBUG(4,(" SMB encrypt failed\n"));
 635
 636                         if (context->internal->smb_encryption_level == 2) {
 637                                 cli_shutdown(c);
 638                                 errno = EPERM;
 639                                 return NULL;
 640                         }
 641                 }
 642                 DEBUG(4,(" SMB encrypt ok\n"));
 643         }
 644
 645         /*
 646          * Ok, we have got a nice connection
 647          * Let's allocate a server structure.
 648          */
 649
 650         srv = SMB_MALLOC_P(SMBCSRV);
 651         if (!srv) {
 652                 cli_shutdown(c);
 653                 errno = ENOMEM;
 654                 return NULL;
 655         }
 656
 657         ZERO_STRUCTP(srv);
 658         DLIST_ADD(srv->cli, c);
 659         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 660         srv->no_pathinfo = False;
 661         srv->no_pathinfo2 = False;
 662         srv->no_pathinfo3 = False;
 663         srv->no_nt_session = False;
 664
 665 done:
 666         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 667                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 668         } else {
 669                 workgroup = *pp_workgroup;
 670         }
 671         if(!workgroup) {
 672                 if (c != NULL) {
 673                         cli_shutdown(c);
 674                 }
 675                 SAFE_FREE(srv);
 676                 return NULL;
 677         }
 678
 679         /* set the credentials to make DFS work */
 680         smbc_set_credentials_with_fallback(context,
 681                                            workgroup,
 682                                            *pp_username,
 683                                            *pp_password);
 684
 685         return srv;
 686 }
 687
 688 SMBCSRV *
 689 SMBC_server(TALLOC_CTX *ctx,
 690                 SMBCCTX *context,
 691                 bool connect_if_not_found,
 692                 const char *server,
 693                 uint16_t port,
 694                 const char *share,
 695                 char **pp_workgroup,
 696                 char **pp_username,
 697                 char **pp_password)
 698 {
 699         SMBCSRV *srv=NULL;
 700         bool in_cache = false;
 701
 702         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 703                         server, port, share, pp_workgroup,
 704                         pp_username, pp_password, &in_cache);
 705
 706         if (!srv) {
 707                 return NULL;
 708         }
 709         if (in_cache) {
 710                 return srv;
 711         }
 712
 713         /* Now add it to the cache (internal or external)  */
 714         /* Let the cache function set errno if it wants to */
 715         errno = 0;
 716         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 717                                                 server, share,
 718                                                 *pp_workgroup,
 719                                                 *pp_username)) {
 720                 int saved_errno = errno;
 721                 DEBUG(3, (" Failed to add server to cache\n"));
 722                 errno = saved_errno;
 723                 if (errno == 0) {
 724                         errno = ENOMEM;
 725                 }
 726                 SAFE_FREE(srv);
 727                 return NULL;
 728         }
 729
 730         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 731                 server, share, srv));
 732
 733         DLIST_ADD(context->internal->servers, srv);
 734         return srv;
 735 }
 736
 737 /*
 738  * Connect to a server for getting/setting attributes, possibly on an existing
 739  * connection.  This works similarly to SMBC_server().
 740  */
 741 SMBCSRV *
 742 SMBC_attr_server(TALLOC_CTX *ctx,
 743                  SMBCCTX *context,
 744                  const char *server,
 745                  uint16_t port,
 746                  const char *share,
 747                  char **pp_workgroup,
 748                  char **pp_username,
 749                  char **pp_password)
 750 {
 751         int flags;
 752         struct cli_state *ipc_cli = NULL;
 753         struct rpc_pipe_client *pipe_hnd = NULL;
 754         NTSTATUS nt_status;
 755         SMBCSRV *srv=NULL;
 756         SMBCSRV *ipc_srv=NULL;
 757
 758         /*
 759          * Use srv->cli->desthost and srv->cli->share instead of
 760          * server and share below to connect to the actual share,
 761          * i.e., a normal share or a referred share from
 762          * 'msdfs proxy' share.
 763          */
 764         srv = SMBC_server(ctx, context, true, server, port, share,
 765                         pp_workgroup, pp_username, pp_password);
 766         if (!srv) {
 767                 return NULL;
 768         }
 769         server = smbXcli_conn_remote_name(srv->cli->conn);
 770         share = srv->cli->share;
 771
 772         /*
 773          * See if we've already created this special connection.  Reference
 774          * our "special" share name '*IPC$', which is an impossible real share
 775          * name due to the leading asterisk.
 776          */
 777         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 778                                    pp_workgroup, pp_username, pp_password);
 779         if (!ipc_srv) {
 780                 int signing_state = SMB_SIGNING_DEFAULT;
 781
 782                 /* We didn't find a cached connection.  Get the password */
 783                 if (!*pp_password || (*pp_password)[0] == '\0') {
 784                         /* ... then retrieve it now. */
 785                         SMBC_call_auth_fn(ctx, context, server, share,
 786                                           pp_workgroup,
 787                                           pp_username,
 788                                           pp_password);
 789                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 790                                 errno = ENOMEM;
 791                                 return NULL;
 792                         }
 793                 }
 794
 795                 flags = 0;
 796                 if (smbc_getOptionUseKerberos(context)) {
 797                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 798                 }
 799                 if (smbc_getOptionUseCCache(context)) {
 800                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 801                 }
 802                 if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 803                         signing_state = SMB_SIGNING_REQUIRED;
 804                 }
 805
 806                 nt_status = cli_full_connection(&ipc_cli,
 807                                                 lp_netbios_name(), server,
 808                                                 NULL, 0, "IPC$", "?????",
 809                                                 *pp_username,
 810                                                 *pp_workgroup,
 811                                                 *pp_password,
 812                                                 flags,
 813                                                 signing_state);
 814                 if (! NT_STATUS_IS_OK(nt_status)) {
 815                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 816                                  nt_errstr(nt_status)));
 817                         errno = ENOTSUP;
 818                         return NULL;
 819                 }
 820
 821                 if (context->internal->smb_encryption_level) {
 822                         /* Attempt encryption. */
 823                         nt_status = cli_cm_force_encryption(ipc_cli,
 824                                                             *pp_username,
 825                                                             *pp_password,
 826                                                             *pp_workgroup,
 827                                                             "IPC$");
 828                         if (!NT_STATUS_IS_OK(nt_status)) {
 829
 830                                 /*
 831                                  * context->smb_encryption_level ==
 832                                  * 1 means don't fail if encryption can't be
 833                                  * negotiated, == 2 means fail if encryption
 834                                  * can't be negotiated.
 835                                  */
 836
 837                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 838
 839                                 if (context->internal->smb_encryption_level == 2) {
 840                                         cli_shutdown(ipc_cli);
 841                                         errno = EPERM;
 842                                         return NULL;
 843                                 }
 844                         }
 845                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 846                 }
 847
 848                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 849                 if (!ipc_srv) {
 850                         errno = ENOMEM;
 851                         cli_shutdown(ipc_cli);
 852                         return NULL;
 853                 }
 854
 855                 ZERO_STRUCTP(ipc_srv);
 856                 DLIST_ADD(ipc_srv->cli, ipc_cli);
 857
 858                 nt_status = cli_rpc_pipe_open_noauth(
 859                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 860                 if (!NT_STATUS_IS_OK(nt_status)) {
 861                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 862                         errno = ENOTSUP;
 863                         cli_shutdown(ipc_srv->cli);
 864                         free(ipc_srv);
 865                         return NULL;
 866                 }
 867
 868                 /*
 869                  * Some systems don't support
 870                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 871                  * so we might as well do it too.
 872                  */
 873
 874                 nt_status = rpccli_lsa_open_policy(
 875                         pipe_hnd,
 876                         talloc_tos(),
 877                         True,
 878                         GENERIC_EXECUTE_ACCESS,
 879                         &ipc_srv->pol);
 880
 881                 if (!NT_STATUS_IS_OK(nt_status)) {
 882                         errno = SMBC_errno(context, ipc_srv->cli);
 883                         cli_shutdown(ipc_srv->cli);
 884                         free(ipc_srv);
 885                         return NULL;
 886                 }
 887
 888                 /* now add it to the cache (internal or external) */
 889
 890                 errno = 0;      /* let cache function set errno if it likes */
 891                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 892                                                              server,
 893                                                              "*IPC$",
 894                                                              *pp_workgroup,
 895                                                              *pp_username)) {
 896                         DEBUG(3, (" Failed to add server to cache\n"));
 897                         if (errno == 0) {
 898                                 errno = ENOMEM;
 899                         }
 900                         cli_shutdown(ipc_srv->cli);
 901                         free(ipc_srv);
 902                         return NULL;
 903                 }
 904
 905                 DLIST_ADD(context->internal->servers, ipc_srv);
 906         }
 907
 908         return ipc_srv;
 909 }