source3/libsmb/libsmb_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SMB client library implementation
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Richard Sharpe 2000, 2002
   6    Copyright (C) John Terpstra 2000
   7    Copyright (C) Tom Jansen (Ninja ISD) 2002
   8    Copyright (C) Derrell Lipman 2003-2008
   9    Copyright (C) Jeremy Allison 2007, 2008
  10    Copyright (C) SATOH Fumiyasu <fumiyas@osstech.co.jp> 2009.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "libsmb/libsmb.h"
  28 #include "libsmbclient.h"
  29 #include "libsmb_internal.h"
  30 #include "../librpc/gen_ndr/ndr_lsa.h"
  31 #include "rpc_client/cli_pipe.h"
  32 #include "rpc_client/cli_lsarpc.h"
  33 #include "libcli/security/security.h"
  34 #include "libsmb/nmblib.h"
  35 #include "../libcli/smb/smbXcli_base.h"
  36
  37 /*
  38  * Check a server for being alive and well.
  39  * returns 0 if the server is in shape. Returns 1 on error
  40  *
  41  * Also useable outside libsmbclient to enable external cache
  42  * to do some checks too.
  43  */
  44 int
  45 SMBC_check_server(SMBCCTX * context,
  46                   SMBCSRV * server)
  47 {
  48         time_t now;
  49
  50         if (!cli_state_is_connected(server->cli)) {
  51                 return 1;
  52         }
  53
  54         now = time_mono(NULL);
  55
  56         if (server->last_echo_time == (time_t)0 ||
  57                         now > server->last_echo_time +
  58                                 (server->cli->timeout/1000)) {
  59                 unsigned char data[16] = {0};
  60                 NTSTATUS status = cli_echo(server->cli,
  61                                         1,
  62                                         data_blob_const(data, sizeof(data)));
  63                 if (!NT_STATUS_IS_OK(status)) {
  64                         return 1;
  65                 }
  66                 server->last_echo_time = now;
  67         }
  68         return 0;
  69 }
  70
  71 /*
  72  * Remove a server from the cached server list it's unused.
  73  * On success, 0 is returned. 1 is returned if the server could not be removed.
  74  *
  75  * Also useable outside libsmbclient
  76  */
  77 int
  78 SMBC_remove_unused_server(SMBCCTX * context,
  79                           SMBCSRV * srv)
  80 {
  81         SMBCFILE * file;
  82
  83         /* are we being fooled ? */
  84         if (!context || !context->internal->initialized || !srv) {
  85                 return 1;
  86         }
  87
  88         /* Check all open files/directories for a relation with this server */
  89         for (file = context->internal->files; file; file = file->next) {
  90                 if (file->srv == srv) {
  91                         /* Still used */
  92                         DEBUG(3, ("smbc_remove_usused_server: "
  93                                   "%p still used by %p.\n",
  94                                   srv, file));
  95                         return 1;
  96                 }
  97         }
  98
  99         DLIST_REMOVE(context->internal->servers, srv);
 100
 101         cli_shutdown(srv->cli);
 102         srv->cli = NULL;
 103
 104         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
 105
 106         smbc_getFunctionRemoveCachedServer(context)(context, srv);
 107
 108         SAFE_FREE(srv);
 109         return 0;
 110 }
 111
 112 /****************************************************************
 113  * Call the auth_fn with fixed size (fstring) buffers.
 114  ***************************************************************/
 115 static void
 116 SMBC_call_auth_fn(TALLOC_CTX *ctx,
 117                   SMBCCTX *context,
 118                   const char *server,
 119                   const char *share,
 120                   char **pp_workgroup,
 121                   char **pp_username,
 122                   char **pp_password)
 123 {
 124         fstring workgroup = { 0 };
 125         fstring username = { 0 };
 126         fstring password = { 0 };
 127         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 128
 129         if (*pp_workgroup != NULL) {
 130                 strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 131         }
 132         if (*pp_username != NULL) {
 133                 strlcpy(username, *pp_username, sizeof(username));
 134         }
 135         if (*pp_password != NULL) {
 136                 strlcpy(password, *pp_password, sizeof(password));
 137         }
 138
 139         /* See if there's an authentication with context function provided */
 140         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 141         if (auth_with_context_fn)
 142         {
 143             (* auth_with_context_fn)(context,
 144                                      server, share,
 145                                      workgroup, sizeof(workgroup),
 146                                      username, sizeof(username),
 147                                      password, sizeof(password));
 148         }
 149         else
 150         {
 151             smbc_getFunctionAuthData(context)(server, share,
 152                                               workgroup, sizeof(workgroup),
 153                                               username, sizeof(username),
 154                                               password, sizeof(password));
 155         }
 156
 157         TALLOC_FREE(*pp_workgroup);
 158         TALLOC_FREE(*pp_username);
 159         TALLOC_FREE(*pp_password);
 160
 161         *pp_workgroup = talloc_strdup(ctx, workgroup);
 162         *pp_username = talloc_strdup(ctx, username);
 163         *pp_password = talloc_strdup(ctx, password);
 164 }
 165
 166
 167 void
 168 SMBC_get_auth_data(const char *server, const char *share,
 169                    char *workgroup_buf, int workgroup_buf_len,
 170                    char *username_buf, int username_buf_len,
 171                    char *password_buf, int password_buf_len)
 172 {
 173         /* Default function just uses provided data.  Nothing to do. */
 174 }
 175
 176
 177
 178 SMBCSRV *
 179 SMBC_find_server(TALLOC_CTX *ctx,
 180                  SMBCCTX *context,
 181                  const char *server,
 182                  const char *share,
 183                  char **pp_workgroup,
 184                  char **pp_username,
 185                  char **pp_password)
 186 {
 187         SMBCSRV *srv;
 188         int auth_called = 0;
 189
 190         if (!pp_workgroup || !pp_username || !pp_password) {
 191                 return NULL;
 192         }
 193
 194 check_server_cache:
 195
 196         srv = smbc_getFunctionGetCachedServer(context)(context,
 197                                                        server, share,
 198                                                        *pp_workgroup,
 199                                                        *pp_username);
 200
 201         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 202                                      !*pp_password || !(*pp_password)[0])) {
 203                 SMBC_call_auth_fn(ctx, context, server, share,
 204                                   pp_workgroup, pp_username, pp_password);
 205
 206                 /*
 207                  * However, smbc_auth_fn may have picked up info relating to
 208                  * an existing connection, so try for an existing connection
 209                  * again ...
 210                  */
 211                 auth_called = 1;
 212                 goto check_server_cache;
 213
 214         }
 215
 216         if (srv) {
 217                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 218                         /*
 219                          * This server is no good anymore
 220                          * Try to remove it and check for more possible
 221                          * servers in the cache
 222                          */
 223                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 224                                                                         srv)) {
 225                                 /*
 226                                  * We could not remove the server completely,
 227                                  * remove it from the cache so we will not get
 228                                  * it again. It will be removed when the last
 229                                  * file/dir is closed.
 230                                  */
 231                                 smbc_getFunctionRemoveCachedServer(context)(context,
 232                                                                             srv);
 233                         }
 234
 235                         /*
 236                          * Maybe there are more cached connections to this
 237                          * server
 238                          */
 239                         goto check_server_cache;
 240                 }
 241
 242                 return srv;
 243         }
 244
 245         return NULL;
 246 }
 247
 248 /*
 249  * Connect to a server, possibly on an existing connection
 250  *
 251  * Here, what we want to do is: If the server and username
 252  * match an existing connection, reuse that, otherwise, establish a
 253  * new connection.
 254  *
 255  * If we have to create a new connection, call the auth_fn to get the
 256  * info we need, unless the username and password were passed in.
 257  */
 258
 259 static SMBCSRV *
 260 SMBC_server_internal(TALLOC_CTX *ctx,
 261             SMBCCTX *context,
 262             bool connect_if_not_found,
 263             const char *server,
 264             uint16_t port,
 265             const char *share,
 266             char **pp_workgroup,
 267             char **pp_username,
 268             char **pp_password,
 269             bool *in_cache)
 270 {
 271         SMBCSRV *srv=NULL;
 272         char *workgroup = NULL;
 273         struct cli_state *c = NULL;
 274         const char *server_n = server;
 275         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 276         uint32_t fs_attrs = 0;
 277         const char *username_used = NULL;
 278         const char *password_used = NULL;
 279         NTSTATUS status;
 280         char *newserver, *newshare;
 281         int flags = 0;
 282         struct smbXcli_tcon *tcon = NULL;
 283         int signing_state = SMB_SIGNING_DEFAULT;
 284
 285         ZERO_STRUCT(c);
 286         *in_cache = false;
 287
 288         if (server[0] == 0) {
 289                 errno = EPERM;
 290                 return NULL;
 291         }
 292
 293         /* Look for a cached connection */
 294         srv = SMBC_find_server(ctx, context, server, share,
 295                                pp_workgroup, pp_username, pp_password);
 296
 297         /*
 298          * If we found a connection and we're only allowed one share per
 299          * server...
 300          */
 301         if (srv &&
 302             share != NULL && *share != '\0' &&
 303             smbc_getOptionOneSharePerServer(context)) {
 304
 305                 /*
 306                  * ... then if there's no current connection to the share,
 307                  * connect to it.  SMBC_find_server(), or rather the function
 308                  * pointed to by context->get_cached_srv_fn which
 309                  * was called by SMBC_find_server(), will have issued a tree
 310                  * disconnect if the requested share is not the same as the
 311                  * one that was already connected.
 312                  */
 313
 314                 /*
 315                  * Use srv->cli->desthost and srv->cli->share instead of
 316                  * server and share below to connect to the actual share,
 317                  * i.e., a normal share or a referred share from
 318                  * 'msdfs proxy' share.
 319                  */
 320                 if (!cli_state_has_tcon(srv->cli)) {
 321                         /* Ensure we have accurate auth info */
 322                         SMBC_call_auth_fn(ctx, context,
 323                                           smbXcli_conn_remote_name(srv->cli->conn),
 324                                           srv->cli->share,
 325                                           pp_workgroup,
 326                                           pp_username,
 327                                           pp_password);
 328
 329                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 330                                 errno = ENOMEM;
 331                                 cli_shutdown(srv->cli);
 332                                 srv->cli = NULL;
 333                                 smbc_getFunctionRemoveCachedServer(context)(context,
 334                                                                             srv);
 335                                 return NULL;
 336                         }
 337
 338                         /*
 339                          * We don't need to renegotiate encryption
 340                          * here as the encryption context is not per
 341                          * tid.
 342                          */
 343
 344                         status = cli_tree_connect(srv->cli,
 345                                                   srv->cli->share,
 346                                                   "?????",
 347                                                   *pp_password,
 348                                                   strlen(*pp_password)+1);
 349                         if (!NT_STATUS_IS_OK(status)) {
 350                                 errno = map_errno_from_nt_status(status);
 351                                 cli_shutdown(srv->cli);
 352                                 srv->cli = NULL;
 353                                 smbc_getFunctionRemoveCachedServer(context)(context,
 354                                                                             srv);
 355                                 srv = NULL;
 356                         }
 357
 358                         /* Determine if this share supports case sensitivity */
 359                         if (is_ipc) {
 360                                 DEBUG(4,
 361                                       ("IPC$ so ignore case sensitivity\n"));
 362                                 status = NT_STATUS_OK;
 363                         } else {
 364                                 status = cli_get_fs_attr_info(c, &fs_attrs);
 365                         }
 366
 367                         if (!NT_STATUS_IS_OK(status)) {
 368                                 DEBUG(4, ("Could not retrieve "
 369                                           "case sensitivity flag: %s.\n",
 370                                           nt_errstr(status)));
 371
 372                                 /*
 373                                  * We can't determine the case sensitivity of
 374                                  * the share. We have no choice but to use the
 375                                  * user-specified case sensitivity setting.
 376                                  */
 377                                 if (smbc_getOptionCaseSensitive(context)) {
 378                                         cli_set_case_sensitive(c, True);
 379                                 } else {
 380                                         cli_set_case_sensitive(c, False);
 381                                 }
 382                         } else if (!is_ipc) {
 383                                 DEBUG(4,
 384                                       ("Case sensitive: %s\n",
 385                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 386                                         ? "True"
 387                                         : "False")));
 388                                 cli_set_case_sensitive(
 389                                         c,
 390                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 391                                          ? True
 392                                          : False));
 393                         }
 394
 395                         /*
 396                          * Regenerate the dev value since it's based on both
 397                          * server and share
 398                          */
 399                         if (srv) {
 400                                 const char *remote_name =
 401                                         smbXcli_conn_remote_name(srv->cli->conn);
 402
 403                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 404                                                    str_checksum(srv->cli->share));
 405                         }
 406                 }
 407         }
 408
 409         /* If we have a connection... */
 410         if (srv) {
 411
 412                 /* ... then we're done here.  Give 'em what they came for. */
 413                 *in_cache = true;
 414                 goto done;
 415         }
 416
 417         /* If we're not asked to connect when a connection doesn't exist... */
 418         if (! connect_if_not_found) {
 419                 /* ... then we're done here. */
 420                 return NULL;
 421         }
 422
 423         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 424                 errno = ENOMEM;
 425                 return NULL;
 426         }
 427
 428         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 429
 430         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 431
 432         status = NT_STATUS_UNSUCCESSFUL;
 433
 434         if (smbc_getOptionUseKerberos(context)) {
 435                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 436         }
 437
 438         if (smbc_getOptionFallbackAfterKerberos(context)) {
 439                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 440         }
 441
 442         if (smbc_getOptionUseCCache(context)) {
 443                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 444         }
 445
 446         if (smbc_getOptionUseNTHash(context)) {
 447                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 448         }
 449
 450         if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 451                 signing_state = SMB_SIGNING_REQUIRED;
 452         }
 453
 454         if (port == 0) {
 455                 if (share == NULL || *share == '\0' || is_ipc) {
 456                         /*
 457                          * Try 139 first for IPC$
 458                          */
 459                         status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 460                                         smbc_getNetbiosName(context),
 461                                         signing_state, flags, &c);
 462                 }
 463         }
 464
 465         if (!NT_STATUS_IS_OK(status)) {
 466                 /*
 467                  * No IPC$ or 139 did not work
 468                  */
 469                 status = cli_connect_nb(server_n, NULL, port, 0x20,
 470                                         smbc_getNetbiosName(context),
 471                                         signing_state, flags, &c);
 472         }
 473
 474         if (!NT_STATUS_IS_OK(status)) {
 475                 errno = map_errno_from_nt_status(status);
 476                 return NULL;
 477         }
 478
 479         cli_set_timeout(c, smbc_getTimeout(context));
 480
 481         status = smbXcli_negprot(c->conn, c->timeout,
 482                                  lp_client_min_protocol(),
 483                                  lp_client_max_protocol());
 484         if (!NT_STATUS_IS_OK(status)) {
 485                 cli_shutdown(c);
 486                 errno = ETIMEDOUT;
 487                 return NULL;
 488         }
 489
 490         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 491                 /* Ensure we ask for some initial credits. */
 492                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 493         }
 494
 495         username_used = *pp_username;
 496         password_used = *pp_password;
 497
 498         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 499                                                password_used,
 500                                                *pp_workgroup))) {
 501
 502                 /* Failed.  Try an anonymous login, if allowed by flags. */
 503                 username_used = "";
 504                 password_used = "";
 505
 506                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 507                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 508                                                        password_used,
 509                                                        *pp_workgroup))) {
 510
 511                         cli_shutdown(c);
 512                         errno = EPERM;
 513                         return NULL;
 514                 }
 515         }
 516
 517         DEBUG(4,(" session setup ok\n"));
 518
 519         /* here's the fun part....to support 'msdfs proxy' shares
 520            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 521            here before trying to connect to the original share.
 522            cli_check_msdfs_proxy() will fail if it is a normal share. */
 523
 524         if (smbXcli_conn_dfs_supported(c->conn) &&
 525                         cli_check_msdfs_proxy(ctx, c, share,
 526                                 &newserver, &newshare,
 527                                 /* FIXME: cli_check_msdfs_proxy() does
 528                                    not support smbc_smb_encrypt_level type */
 529                                 context->internal->smb_encryption_level ?
 530                                         true : false,
 531                                 *pp_username,
 532                                 *pp_password,
 533                                 *pp_workgroup)) {
 534                 cli_shutdown(c);
 535                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 536                                 newserver, port, newshare, pp_workgroup,
 537                                 pp_username, pp_password, in_cache);
 538                 TALLOC_FREE(newserver);
 539                 TALLOC_FREE(newshare);
 540                 return srv;
 541         }
 542
 543         /* must be a normal share */
 544
 545         status = cli_tree_connect(c, share, "?????", *pp_password,
 546                                   strlen(*pp_password)+1);
 547         if (!NT_STATUS_IS_OK(status)) {
 548                 errno = map_errno_from_nt_status(status);
 549                 cli_shutdown(c);
 550                 return NULL;
 551         }
 552
 553         DEBUG(4,(" tconx ok\n"));
 554
 555         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 556                 tcon = c->smb2.tcon;
 557         } else {
 558                 tcon = c->smb1.tcon;
 559         }
 560
 561         /* Determine if this share supports case sensitivity */
 562         if (is_ipc) {
 563                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 564                 status = NT_STATUS_OK;
 565         } else {
 566                 status = cli_get_fs_attr_info(c, &fs_attrs);
 567         }
 568
 569         if (!NT_STATUS_IS_OK(status)) {
 570                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 571                           nt_errstr(status)));
 572
 573                 /*
 574                  * We can't determine the case sensitivity of the share. We
 575                  * have no choice but to use the user-specified case
 576                  * sensitivity setting.
 577                  */
 578                 if (smbc_getOptionCaseSensitive(context)) {
 579                         cli_set_case_sensitive(c, True);
 580                 } else {
 581                         cli_set_case_sensitive(c, False);
 582                 }
 583         } else if (!is_ipc) {
 584                 DEBUG(4, ("Case sensitive: %s\n",
 585                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 586                            ? "True"
 587                            : "False")));
 588                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 589         }
 590
 591         if (context->internal->smb_encryption_level) {
 592                 /* Attempt UNIX smb encryption. */
 593                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 594                                                           username_used,
 595                                                           password_used,
 596                                                           *pp_workgroup))) {
 597
 598                         /*
 599                          * context->smb_encryption_level == 1
 600                          * means don't fail if encryption can't be negotiated,
 601                          * == 2 means fail if encryption can't be negotiated.
 602                          */
 603
 604                         DEBUG(4,(" SMB encrypt failed\n"));
 605
 606                         if (context->internal->smb_encryption_level == 2) {
 607                                 cli_shutdown(c);
 608                                 errno = EPERM;
 609                                 return NULL;
 610                         }
 611                 }
 612                 DEBUG(4,(" SMB encrypt ok\n"));
 613         }
 614
 615         /*
 616          * Ok, we have got a nice connection
 617          * Let's allocate a server structure.
 618          */
 619
 620         srv = SMB_MALLOC_P(SMBCSRV);
 621         if (!srv) {
 622                 cli_shutdown(c);
 623                 errno = ENOMEM;
 624                 return NULL;
 625         }
 626
 627         ZERO_STRUCTP(srv);
 628         DLIST_ADD(srv->cli, c);
 629         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 630         srv->no_pathinfo = False;
 631         srv->no_pathinfo2 = False;
 632         srv->no_pathinfo3 = False;
 633         srv->no_nt_session = False;
 634
 635 done:
 636         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 637                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 638         } else {
 639                 workgroup = *pp_workgroup;
 640         }
 641         if(!workgroup) {
 642                 if (c != NULL) {
 643                         cli_shutdown(c);
 644                 }
 645                 SAFE_FREE(srv);
 646                 return NULL;
 647         }
 648
 649         /* set the credentials to make DFS work */
 650         smbc_set_credentials_with_fallback(context,
 651                                            workgroup,
 652                                            *pp_username,
 653                                            *pp_password);
 654
 655         return srv;
 656 }
 657
 658 SMBCSRV *
 659 SMBC_server(TALLOC_CTX *ctx,
 660                 SMBCCTX *context,
 661                 bool connect_if_not_found,
 662                 const char *server,
 663                 uint16_t port,
 664                 const char *share,
 665                 char **pp_workgroup,
 666                 char **pp_username,
 667                 char **pp_password)
 668 {
 669         SMBCSRV *srv=NULL;
 670         bool in_cache = false;
 671
 672         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 673                         server, port, share, pp_workgroup,
 674                         pp_username, pp_password, &in_cache);
 675
 676         if (!srv) {
 677                 return NULL;
 678         }
 679         if (in_cache) {
 680                 return srv;
 681         }
 682
 683         /* Now add it to the cache (internal or external)  */
 684         /* Let the cache function set errno if it wants to */
 685         errno = 0;
 686         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 687                                                 server, share,
 688                                                 *pp_workgroup,
 689                                                 *pp_username)) {
 690                 int saved_errno = errno;
 691                 DEBUG(3, (" Failed to add server to cache\n"));
 692                 errno = saved_errno;
 693                 if (errno == 0) {
 694                         errno = ENOMEM;
 695                 }
 696                 SAFE_FREE(srv);
 697                 return NULL;
 698         }
 699
 700         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 701                 server, share, srv));
 702
 703         DLIST_ADD(context->internal->servers, srv);
 704         return srv;
 705 }
 706
 707 /*
 708  * Connect to a server for getting/setting attributes, possibly on an existing
 709  * connection.  This works similarly to SMBC_server().
 710  */
 711 SMBCSRV *
 712 SMBC_attr_server(TALLOC_CTX *ctx,
 713                  SMBCCTX *context,
 714                  const char *server,
 715                  uint16_t port,
 716                  const char *share,
 717                  char **pp_workgroup,
 718                  char **pp_username,
 719                  char **pp_password)
 720 {
 721         int flags;
 722         struct cli_state *ipc_cli = NULL;
 723         struct rpc_pipe_client *pipe_hnd = NULL;
 724         NTSTATUS nt_status;
 725         SMBCSRV *srv=NULL;
 726         SMBCSRV *ipc_srv=NULL;
 727
 728         /*
 729          * Use srv->cli->desthost and srv->cli->share instead of
 730          * server and share below to connect to the actual share,
 731          * i.e., a normal share or a referred share from
 732          * 'msdfs proxy' share.
 733          */
 734         srv = SMBC_server(ctx, context, true, server, port, share,
 735                         pp_workgroup, pp_username, pp_password);
 736         if (!srv) {
 737                 return NULL;
 738         }
 739         server = smbXcli_conn_remote_name(srv->cli->conn);
 740         share = srv->cli->share;
 741
 742         /*
 743          * See if we've already created this special connection.  Reference
 744          * our "special" share name '*IPC$', which is an impossible real share
 745          * name due to the leading asterisk.
 746          */
 747         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 748                                    pp_workgroup, pp_username, pp_password);
 749         if (!ipc_srv) {
 750                 int signing_state = SMB_SIGNING_DEFAULT;
 751
 752                 /* We didn't find a cached connection.  Get the password */
 753                 if (!*pp_password || (*pp_password)[0] == '\0') {
 754                         /* ... then retrieve it now. */
 755                         SMBC_call_auth_fn(ctx, context, server, share,
 756                                           pp_workgroup,
 757                                           pp_username,
 758                                           pp_password);
 759                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 760                                 errno = ENOMEM;
 761                                 return NULL;
 762                         }
 763                 }
 764
 765                 flags = 0;
 766                 if (smbc_getOptionUseKerberos(context)) {
 767                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 768                 }
 769                 if (smbc_getOptionUseCCache(context)) {
 770                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 771                 }
 772                 if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 773                         signing_state = SMB_SIGNING_REQUIRED;
 774                 }
 775
 776                 nt_status = cli_full_connection(&ipc_cli,
 777                                                 lp_netbios_name(), server,
 778                                                 NULL, 0, "IPC$", "?????",
 779                                                 *pp_username,
 780                                                 *pp_workgroup,
 781                                                 *pp_password,
 782                                                 flags,
 783                                                 signing_state);
 784                 if (! NT_STATUS_IS_OK(nt_status)) {
 785                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 786                                  nt_errstr(nt_status)));
 787                         errno = ENOTSUP;
 788                         return NULL;
 789                 }
 790
 791                 if (context->internal->smb_encryption_level) {
 792                         /* Attempt UNIX smb encryption. */
 793                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 794                                                                   *pp_username,
 795                                                                   *pp_password,
 796                                                                   *pp_workgroup))) {
 797
 798                                 /*
 799                                  * context->smb_encryption_level ==
 800                                  * 1 means don't fail if encryption can't be
 801                                  * negotiated, == 2 means fail if encryption
 802                                  * can't be negotiated.
 803                                  */
 804
 805                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 806
 807                                 if (context->internal->smb_encryption_level == 2) {
 808                                         cli_shutdown(ipc_cli);
 809                                         errno = EPERM;
 810                                         return NULL;
 811                                 }
 812                         }
 813                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 814                 }
 815
 816                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 817                 if (!ipc_srv) {
 818                         errno = ENOMEM;
 819                         cli_shutdown(ipc_cli);
 820                         return NULL;
 821                 }
 822
 823                 ZERO_STRUCTP(ipc_srv);
 824                 DLIST_ADD(ipc_srv->cli, ipc_cli);
 825
 826                 nt_status = cli_rpc_pipe_open_noauth(
 827                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 828                 if (!NT_STATUS_IS_OK(nt_status)) {
 829                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 830                         errno = ENOTSUP;
 831                         cli_shutdown(ipc_srv->cli);
 832                         free(ipc_srv);
 833                         return NULL;
 834                 }
 835
 836                 /*
 837                  * Some systems don't support
 838                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 839                  * so we might as well do it too.
 840                  */
 841
 842                 nt_status = rpccli_lsa_open_policy(
 843                         pipe_hnd,
 844                         talloc_tos(),
 845                         True,
 846                         GENERIC_EXECUTE_ACCESS,
 847                         &ipc_srv->pol);
 848
 849                 if (!NT_STATUS_IS_OK(nt_status)) {
 850                         errno = SMBC_errno(context, ipc_srv->cli);
 851                         cli_shutdown(ipc_srv->cli);
 852                         free(ipc_srv);
 853                         return NULL;
 854                 }
 855
 856                 /* now add it to the cache (internal or external) */
 857
 858                 errno = 0;      /* let cache function set errno if it likes */
 859                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 860                                                              server,
 861                                                              "*IPC$",
 862                                                              *pp_workgroup,
 863                                                              *pp_username)) {
 864                         DEBUG(3, (" Failed to add server to cache\n"));
 865                         if (errno == 0) {
 866                                 errno = ENOMEM;
 867                         }
 868                         cli_shutdown(ipc_srv->cli);
 869                         free(ipc_srv);
 870                         return NULL;
 871                 }
 872
 873                 DLIST_ADD(context->internal->servers, ipc_srv);
 874         }
 875
 876         return ipc_srv;
 877 }