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