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                         if (!NT_STATUS_IS_OK(status)) {
 349                                 errno = map_errno_from_nt_status(status);
 350                                 cli_shutdown(srv->cli);
 351                                 srv->cli = NULL;
 352                                 smbc_getFunctionRemoveCachedServer(context)(context,
 353                                                                             srv);
 354                                 srv = NULL;
 355                         }
 356
 357                         /* Determine if this share supports case sensitivity */
 358                         if (is_ipc) {
 359                                 DEBUG(4,
 360                                       ("IPC$ so ignore case sensitivity\n"));
 361                                 status = NT_STATUS_OK;
 362                         } else {
 363                                 status = cli_get_fs_attr_info(c, &fs_attrs);
 364                         }
 365
 366                         if (!NT_STATUS_IS_OK(status)) {
 367                                 DEBUG(4, ("Could not retrieve "
 368                                           "case sensitivity flag: %s.\n",
 369                                           nt_errstr(status)));
 370
 371                                 /*
 372                                  * We can't determine the case sensitivity of
 373                                  * the share. We have no choice but to use the
 374                                  * user-specified case sensitivity setting.
 375                                  */
 376                                 if (smbc_getOptionCaseSensitive(context)) {
 377                                         cli_set_case_sensitive(c, True);
 378                                 } else {
 379                                         cli_set_case_sensitive(c, False);
 380                                 }
 381                         } else if (!is_ipc) {
 382                                 DEBUG(4,
 383                                       ("Case sensitive: %s\n",
 384                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 385                                         ? "True"
 386                                         : "False")));
 387                                 cli_set_case_sensitive(
 388                                         c,
 389                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 390                                          ? True
 391                                          : False));
 392                         }
 393
 394                         /*
 395                          * Regenerate the dev value since it's based on both
 396                          * server and share
 397                          */
 398                         if (srv) {
 399                                 const char *remote_name =
 400                                         smbXcli_conn_remote_name(srv->cli->conn);
 401
 402                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 403                                                    str_checksum(srv->cli->share));
 404                         }
 405                 }
 406         }
 407
 408         /* If we have a connection... */
 409         if (srv) {
 410
 411                 /* ... then we're done here.  Give 'em what they came for. */
 412                 *in_cache = true;
 413                 goto done;
 414         }
 415
 416         /* If we're not asked to connect when a connection doesn't exist... */
 417         if (! connect_if_not_found) {
 418                 /* ... then we're done here. */
 419                 return NULL;
 420         }
 421
 422         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 423                 errno = ENOMEM;
 424                 return NULL;
 425         }
 426
 427         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 428
 429         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 430
 431         status = NT_STATUS_UNSUCCESSFUL;
 432
 433         if (smbc_getOptionUseKerberos(context)) {
 434                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 435         }
 436
 437         if (smbc_getOptionFallbackAfterKerberos(context)) {
 438                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 439         }
 440
 441         if (smbc_getOptionUseCCache(context)) {
 442                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 443         }
 444
 445         if (smbc_getOptionUseNTHash(context)) {
 446                 flags |= CLI_FULL_CONNECTION_USE_NT_HASH;
 447         }
 448
 449         if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 450                 signing_state = SMB_SIGNING_REQUIRED;
 451         }
 452
 453         if (port == 0) {
 454                 if (share == NULL || *share == '\0' || is_ipc) {
 455                         /*
 456                          * Try 139 first for IPC$
 457                          */
 458                         status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 459                                         smbc_getNetbiosName(context),
 460                                         signing_state, flags, &c);
 461                 }
 462         }
 463
 464         if (!NT_STATUS_IS_OK(status)) {
 465                 /*
 466                  * No IPC$ or 139 did not work
 467                  */
 468                 status = cli_connect_nb(server_n, NULL, port, 0x20,
 469                                         smbc_getNetbiosName(context),
 470                                         signing_state, flags, &c);
 471         }
 472
 473         if (!NT_STATUS_IS_OK(status)) {
 474                 errno = map_errno_from_nt_status(status);
 475                 return NULL;
 476         }
 477
 478         cli_set_timeout(c, smbc_getTimeout(context));
 479
 480         status = smbXcli_negprot(c->conn, c->timeout,
 481                                  lp_client_min_protocol(),
 482                                  lp_client_max_protocol());
 483         if (!NT_STATUS_IS_OK(status)) {
 484                 cli_shutdown(c);
 485                 errno = ETIMEDOUT;
 486                 return NULL;
 487         }
 488
 489         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 490                 /* Ensure we ask for some initial credits. */
 491                 smb2cli_conn_set_max_credits(c->conn, DEFAULT_SMB2_MAX_CREDITS);
 492         }
 493
 494         username_used = *pp_username;
 495         password_used = *pp_password;
 496
 497         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 498                                                password_used,
 499                                                *pp_workgroup))) {
 500
 501                 /* Failed.  Try an anonymous login, if allowed by flags. */
 502                 username_used = "";
 503                 password_used = "";
 504
 505                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 506                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 507                                                        password_used,
 508                                                        *pp_workgroup))) {
 509
 510                         cli_shutdown(c);
 511                         errno = EPERM;
 512                         return NULL;
 513                 }
 514         }
 515
 516         DEBUG(4,(" session setup ok\n"));
 517
 518         /* here's the fun part....to support 'msdfs proxy' shares
 519            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 520            here before trying to connect to the original share.
 521            cli_check_msdfs_proxy() will fail if it is a normal share. */
 522
 523         if (smbXcli_conn_dfs_supported(c->conn) &&
 524                         cli_check_msdfs_proxy(ctx, c, share,
 525                                 &newserver, &newshare,
 526                                 /* FIXME: cli_check_msdfs_proxy() does
 527                                    not support smbc_smb_encrypt_level type */
 528                                 context->internal->smb_encryption_level ?
 529                                         true : false,
 530                                 *pp_username,
 531                                 *pp_password,
 532                                 *pp_workgroup)) {
 533                 cli_shutdown(c);
 534                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 535                                 newserver, port, newshare, pp_workgroup,
 536                                 pp_username, pp_password, in_cache);
 537                 TALLOC_FREE(newserver);
 538                 TALLOC_FREE(newshare);
 539                 return srv;
 540         }
 541
 542         /* must be a normal share */
 543
 544         status = cli_tree_connect(c, share, "?????", *pp_password);
 545         if (!NT_STATUS_IS_OK(status)) {
 546                 errno = map_errno_from_nt_status(status);
 547                 cli_shutdown(c);
 548                 return NULL;
 549         }
 550
 551         DEBUG(4,(" tconx ok\n"));
 552
 553         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 554                 tcon = c->smb2.tcon;
 555         } else {
 556                 tcon = c->smb1.tcon;
 557         }
 558
 559         /* Determine if this share supports case sensitivity */
 560         if (is_ipc) {
 561                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 562                 status = NT_STATUS_OK;
 563         } else {
 564                 status = cli_get_fs_attr_info(c, &fs_attrs);
 565         }
 566
 567         if (!NT_STATUS_IS_OK(status)) {
 568                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 569                           nt_errstr(status)));
 570
 571                 /*
 572                  * We can't determine the case sensitivity of the share. We
 573                  * have no choice but to use the user-specified case
 574                  * sensitivity setting.
 575                  */
 576                 if (smbc_getOptionCaseSensitive(context)) {
 577                         cli_set_case_sensitive(c, True);
 578                 } else {
 579                         cli_set_case_sensitive(c, False);
 580                 }
 581         } else if (!is_ipc) {
 582                 DEBUG(4, ("Case sensitive: %s\n",
 583                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 584                            ? "True"
 585                            : "False")));
 586                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 587         }
 588
 589         if (context->internal->smb_encryption_level) {
 590                 /* Attempt UNIX smb encryption. */
 591                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 592                                                           username_used,
 593                                                           password_used,
 594                                                           *pp_workgroup))) {
 595
 596                         /*
 597                          * context->smb_encryption_level == 1
 598                          * means don't fail if encryption can't be negotiated,
 599                          * == 2 means fail if encryption can't be negotiated.
 600                          */
 601
 602                         DEBUG(4,(" SMB encrypt failed\n"));
 603
 604                         if (context->internal->smb_encryption_level == 2) {
 605                                 cli_shutdown(c);
 606                                 errno = EPERM;
 607                                 return NULL;
 608                         }
 609                 }
 610                 DEBUG(4,(" SMB encrypt ok\n"));
 611         }
 612
 613         /*
 614          * Ok, we have got a nice connection
 615          * Let's allocate a server structure.
 616          */
 617
 618         srv = SMB_MALLOC_P(SMBCSRV);
 619         if (!srv) {
 620                 cli_shutdown(c);
 621                 errno = ENOMEM;
 622                 return NULL;
 623         }
 624
 625         ZERO_STRUCTP(srv);
 626         DLIST_ADD(srv->cli, c);
 627         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 628         srv->no_pathinfo = False;
 629         srv->no_pathinfo2 = False;
 630         srv->no_pathinfo3 = False;
 631         srv->no_nt_session = False;
 632
 633 done:
 634         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 635                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 636         } else {
 637                 workgroup = *pp_workgroup;
 638         }
 639         if(!workgroup) {
 640                 if (c != NULL) {
 641                         cli_shutdown(c);
 642                 }
 643                 SAFE_FREE(srv);
 644                 return NULL;
 645         }
 646
 647         /* set the credentials to make DFS work */
 648         smbc_set_credentials_with_fallback(context,
 649                                            workgroup,
 650                                            *pp_username,
 651                                            *pp_password);
 652
 653         return srv;
 654 }
 655
 656 SMBCSRV *
 657 SMBC_server(TALLOC_CTX *ctx,
 658                 SMBCCTX *context,
 659                 bool connect_if_not_found,
 660                 const char *server,
 661                 uint16_t port,
 662                 const char *share,
 663                 char **pp_workgroup,
 664                 char **pp_username,
 665                 char **pp_password)
 666 {
 667         SMBCSRV *srv=NULL;
 668         bool in_cache = false;
 669
 670         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 671                         server, port, share, pp_workgroup,
 672                         pp_username, pp_password, &in_cache);
 673
 674         if (!srv) {
 675                 return NULL;
 676         }
 677         if (in_cache) {
 678                 return srv;
 679         }
 680
 681         /* Now add it to the cache (internal or external)  */
 682         /* Let the cache function set errno if it wants to */
 683         errno = 0;
 684         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 685                                                 server, share,
 686                                                 *pp_workgroup,
 687                                                 *pp_username)) {
 688                 int saved_errno = errno;
 689                 DEBUG(3, (" Failed to add server to cache\n"));
 690                 errno = saved_errno;
 691                 if (errno == 0) {
 692                         errno = ENOMEM;
 693                 }
 694                 SAFE_FREE(srv);
 695                 return NULL;
 696         }
 697
 698         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 699                 server, share, srv));
 700
 701         DLIST_ADD(context->internal->servers, srv);
 702         return srv;
 703 }
 704
 705 /*
 706  * Connect to a server for getting/setting attributes, possibly on an existing
 707  * connection.  This works similarly to SMBC_server().
 708  */
 709 SMBCSRV *
 710 SMBC_attr_server(TALLOC_CTX *ctx,
 711                  SMBCCTX *context,
 712                  const char *server,
 713                  uint16_t port,
 714                  const char *share,
 715                  char **pp_workgroup,
 716                  char **pp_username,
 717                  char **pp_password)
 718 {
 719         int flags;
 720         struct cli_state *ipc_cli = NULL;
 721         struct rpc_pipe_client *pipe_hnd = NULL;
 722         NTSTATUS nt_status;
 723         SMBCSRV *srv=NULL;
 724         SMBCSRV *ipc_srv=NULL;
 725
 726         /*
 727          * Use srv->cli->desthost and srv->cli->share instead of
 728          * server and share below to connect to the actual share,
 729          * i.e., a normal share or a referred share from
 730          * 'msdfs proxy' share.
 731          */
 732         srv = SMBC_server(ctx, context, true, server, port, share,
 733                         pp_workgroup, pp_username, pp_password);
 734         if (!srv) {
 735                 return NULL;
 736         }
 737         server = smbXcli_conn_remote_name(srv->cli->conn);
 738         share = srv->cli->share;
 739
 740         /*
 741          * See if we've already created this special connection.  Reference
 742          * our "special" share name '*IPC$', which is an impossible real share
 743          * name due to the leading asterisk.
 744          */
 745         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 746                                    pp_workgroup, pp_username, pp_password);
 747         if (!ipc_srv) {
 748                 int signing_state = SMB_SIGNING_DEFAULT;
 749
 750                 /* We didn't find a cached connection.  Get the password */
 751                 if (!*pp_password || (*pp_password)[0] == '\0') {
 752                         /* ... then retrieve it now. */
 753                         SMBC_call_auth_fn(ctx, context, server, share,
 754                                           pp_workgroup,
 755                                           pp_username,
 756                                           pp_password);
 757                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 758                                 errno = ENOMEM;
 759                                 return NULL;
 760                         }
 761                 }
 762
 763                 flags = 0;
 764                 if (smbc_getOptionUseKerberos(context)) {
 765                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 766                 }
 767                 if (smbc_getOptionUseCCache(context)) {
 768                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 769                 }
 770                 if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 771                         signing_state = SMB_SIGNING_REQUIRED;
 772                 }
 773
 774                 nt_status = cli_full_connection(&ipc_cli,
 775                                                 lp_netbios_name(), server,
 776                                                 NULL, 0, "IPC$", "?????",
 777                                                 *pp_username,
 778                                                 *pp_workgroup,
 779                                                 *pp_password,
 780                                                 flags,
 781                                                 signing_state);
 782                 if (! NT_STATUS_IS_OK(nt_status)) {
 783                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 784                                  nt_errstr(nt_status)));
 785                         errno = ENOTSUP;
 786                         return NULL;
 787                 }
 788
 789                 if (context->internal->smb_encryption_level) {
 790                         /* Attempt UNIX smb encryption. */
 791                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 792                                                                   *pp_username,
 793                                                                   *pp_password,
 794                                                                   *pp_workgroup))) {
 795
 796                                 /*
 797                                  * context->smb_encryption_level ==
 798                                  * 1 means don't fail if encryption can't be
 799                                  * negotiated, == 2 means fail if encryption
 800                                  * can't be negotiated.
 801                                  */
 802
 803                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 804
 805                                 if (context->internal->smb_encryption_level == 2) {
 806                                         cli_shutdown(ipc_cli);
 807                                         errno = EPERM;
 808                                         return NULL;
 809                                 }
 810                         }
 811                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 812                 }
 813
 814                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 815                 if (!ipc_srv) {
 816                         errno = ENOMEM;
 817                         cli_shutdown(ipc_cli);
 818                         return NULL;
 819                 }
 820
 821                 ZERO_STRUCTP(ipc_srv);
 822                 DLIST_ADD(ipc_srv->cli, ipc_cli);
 823
 824                 nt_status = cli_rpc_pipe_open_noauth(
 825                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 826                 if (!NT_STATUS_IS_OK(nt_status)) {
 827                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 828                         errno = ENOTSUP;
 829                         cli_shutdown(ipc_srv->cli);
 830                         free(ipc_srv);
 831                         return NULL;
 832                 }
 833
 834                 /*
 835                  * Some systems don't support
 836                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 837                  * so we might as well do it too.
 838                  */
 839
 840                 nt_status = rpccli_lsa_open_policy(
 841                         pipe_hnd,
 842                         talloc_tos(),
 843                         True,
 844                         GENERIC_EXECUTE_ACCESS,
 845                         &ipc_srv->pol);
 846
 847                 if (!NT_STATUS_IS_OK(nt_status)) {
 848                         errno = SMBC_errno(context, ipc_srv->cli);
 849                         cli_shutdown(ipc_srv->cli);
 850                         free(ipc_srv);
 851                         return NULL;
 852                 }
 853
 854                 /* now add it to the cache (internal or external) */
 855
 856                 errno = 0;      /* let cache function set errno if it likes */
 857                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 858                                                              server,
 859                                                              "*IPC$",
 860                                                              *pp_workgroup,
 861                                                              *pp_username)) {
 862                         DEBUG(3, (" Failed to add server to cache\n"));
 863                         if (errno == 0) {
 864                                 errno = ENOMEM;
 865                         }
 866                         cli_shutdown(ipc_srv->cli);
 867                         free(ipc_srv);
 868                         return NULL;
 869                 }
 870
 871                 DLIST_ADD(context->internal->servers, ipc_srv);
 872         }
 873
 874         return ipc_srv;
 875 }