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;
 278         NTSTATUS status;
 279         char *newserver, *newshare;
 280         int flags = 0;
 281         struct smbXcli_tcon *tcon = NULL;
 282         int signing_state = SMB_SIGNING_DEFAULT;
 283
 284         ZERO_STRUCT(c);
 285         *in_cache = false;
 286
 287         if (server[0] == 0) {
 288                 errno = EPERM;
 289                 return NULL;
 290         }
 291
 292         /* Look for a cached connection */
 293         srv = SMBC_find_server(ctx, context, server, share,
 294                                pp_workgroup, pp_username, pp_password);
 295
 296         /*
 297          * If we found a connection and we're only allowed one share per
 298          * server...
 299          */
 300         if (srv &&
 301             share != NULL && *share != '\0' &&
 302             smbc_getOptionOneSharePerServer(context)) {
 303
 304                 /*
 305                  * ... then if there's no current connection to the share,
 306                  * connect to it.  SMBC_find_server(), or rather the function
 307                  * pointed to by context->get_cached_srv_fn which
 308                  * was called by SMBC_find_server(), will have issued a tree
 309                  * disconnect if the requested share is not the same as the
 310                  * one that was already connected.
 311                  */
 312
 313                 /*
 314                  * Use srv->cli->desthost and srv->cli->share instead of
 315                  * server and share below to connect to the actual share,
 316                  * i.e., a normal share or a referred share from
 317                  * 'msdfs proxy' share.
 318                  */
 319                 if (!cli_state_has_tcon(srv->cli)) {
 320                         /* Ensure we have accurate auth info */
 321                         SMBC_call_auth_fn(ctx, context,
 322                                           smbXcli_conn_remote_name(srv->cli->conn),
 323                                           srv->cli->share,
 324                                           pp_workgroup,
 325                                           pp_username,
 326                                           pp_password);
 327
 328                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 329                                 errno = ENOMEM;
 330                                 cli_shutdown(srv->cli);
 331                                 srv->cli = NULL;
 332                                 smbc_getFunctionRemoveCachedServer(context)(context,
 333                                                                             srv);
 334                                 return NULL;
 335                         }
 336
 337                         /*
 338                          * We don't need to renegotiate encryption
 339                          * here as the encryption context is not per
 340                          * tid.
 341                          */
 342
 343                         status = cli_tree_connect(srv->cli,
 344                                                   srv->cli->share,
 345                                                   "?????",
 346                                                   *pp_password,
 347                                                   strlen(*pp_password)+1);
 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
 496         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 497                                                *pp_password,
 498                                                strlen(*pp_password),
 499                                                *pp_password,
 500                                                strlen(*pp_password),
 501                                                *pp_workgroup))) {
 502
 503                 /* Failed.  Try an anonymous login, if allowed by flags. */
 504                 username_used = "";
 505
 506                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 507                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 508                                                        *pp_password, 1,
 509                                                        *pp_password, 0,
 510                                                        *pp_workgroup))) {
 511
 512                         cli_shutdown(c);
 513                         errno = EPERM;
 514                         return NULL;
 515                 }
 516         }
 517
 518         DEBUG(4,(" session setup ok\n"));
 519
 520         /* here's the fun part....to support 'msdfs proxy' shares
 521            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 522            here before trying to connect to the original share.
 523            cli_check_msdfs_proxy() will fail if it is a normal share. */
 524
 525         if (smbXcli_conn_dfs_supported(c->conn) &&
 526                         cli_check_msdfs_proxy(ctx, c, share,
 527                                 &newserver, &newshare,
 528                                 /* FIXME: cli_check_msdfs_proxy() does
 529                                    not support smbc_smb_encrypt_level type */
 530                                 context->internal->smb_encryption_level ?
 531                                         true : false,
 532                                 *pp_username,
 533                                 *pp_password,
 534                                 *pp_workgroup)) {
 535                 cli_shutdown(c);
 536                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 537                                 newserver, port, newshare, pp_workgroup,
 538                                 pp_username, pp_password, in_cache);
 539                 TALLOC_FREE(newserver);
 540                 TALLOC_FREE(newshare);
 541                 return srv;
 542         }
 543
 544         /* must be a normal share */
 545
 546         status = cli_tree_connect(c, share, "?????", *pp_password,
 547                                   strlen(*pp_password)+1);
 548         if (!NT_STATUS_IS_OK(status)) {
 549                 errno = map_errno_from_nt_status(status);
 550                 cli_shutdown(c);
 551                 return NULL;
 552         }
 553
 554         DEBUG(4,(" tconx ok\n"));
 555
 556         if (smbXcli_conn_protocol(c->conn) >= PROTOCOL_SMB2_02) {
 557                 tcon = c->smb2.tcon;
 558         } else {
 559                 tcon = c->smb1.tcon;
 560         }
 561
 562         /* Determine if this share supports case sensitivity */
 563         if (is_ipc) {
 564                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 565                 status = NT_STATUS_OK;
 566         } else {
 567                 status = cli_get_fs_attr_info(c, &fs_attrs);
 568         }
 569
 570         if (!NT_STATUS_IS_OK(status)) {
 571                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 572                           nt_errstr(status)));
 573
 574                 /*
 575                  * We can't determine the case sensitivity of the share. We
 576                  * have no choice but to use the user-specified case
 577                  * sensitivity setting.
 578                  */
 579                 if (smbc_getOptionCaseSensitive(context)) {
 580                         cli_set_case_sensitive(c, True);
 581                 } else {
 582                         cli_set_case_sensitive(c, False);
 583                 }
 584         } else if (!is_ipc) {
 585                 DEBUG(4, ("Case sensitive: %s\n",
 586                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 587                            ? "True"
 588                            : "False")));
 589                 smbXcli_tcon_set_fs_attributes(tcon, fs_attrs);
 590         }
 591
 592         if (context->internal->smb_encryption_level) {
 593                 /* Attempt UNIX smb encryption. */
 594                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 595                                                           username_used,
 596                                                           *pp_password,
 597                                                           *pp_workgroup))) {
 598
 599                         /*
 600                          * context->smb_encryption_level == 1
 601                          * means don't fail if encryption can't be negotiated,
 602                          * == 2 means fail if encryption can't be negotiated.
 603                          */
 604
 605                         DEBUG(4,(" SMB encrypt failed\n"));
 606
 607                         if (context->internal->smb_encryption_level == 2) {
 608                                 cli_shutdown(c);
 609                                 errno = EPERM;
 610                                 return NULL;
 611                         }
 612                 }
 613                 DEBUG(4,(" SMB encrypt ok\n"));
 614         }
 615
 616         /*
 617          * Ok, we have got a nice connection
 618          * Let's allocate a server structure.
 619          */
 620
 621         srv = SMB_MALLOC_P(SMBCSRV);
 622         if (!srv) {
 623                 cli_shutdown(c);
 624                 errno = ENOMEM;
 625                 return NULL;
 626         }
 627
 628         ZERO_STRUCTP(srv);
 629         DLIST_ADD(srv->cli, c);
 630         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 631         srv->no_pathinfo = False;
 632         srv->no_pathinfo2 = False;
 633         srv->no_pathinfo3 = False;
 634         srv->no_nt_session = False;
 635
 636 done:
 637         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 638                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 639         } else {
 640                 workgroup = *pp_workgroup;
 641         }
 642         if(!workgroup) {
 643                 if (c != NULL) {
 644                         cli_shutdown(c);
 645                 }
 646                 SAFE_FREE(srv);
 647                 return NULL;
 648         }
 649
 650         /* set the credentials to make DFS work */
 651         smbc_set_credentials_with_fallback(context,
 652                                            workgroup,
 653                                            *pp_username,
 654                                            *pp_password);
 655
 656         return srv;
 657 }
 658
 659 SMBCSRV *
 660 SMBC_server(TALLOC_CTX *ctx,
 661                 SMBCCTX *context,
 662                 bool connect_if_not_found,
 663                 const char *server,
 664                 uint16_t port,
 665                 const char *share,
 666                 char **pp_workgroup,
 667                 char **pp_username,
 668                 char **pp_password)
 669 {
 670         SMBCSRV *srv=NULL;
 671         bool in_cache = false;
 672
 673         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 674                         server, port, share, pp_workgroup,
 675                         pp_username, pp_password, &in_cache);
 676
 677         if (!srv) {
 678                 return NULL;
 679         }
 680         if (in_cache) {
 681                 return srv;
 682         }
 683
 684         /* Now add it to the cache (internal or external)  */
 685         /* Let the cache function set errno if it wants to */
 686         errno = 0;
 687         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 688                                                 server, share,
 689                                                 *pp_workgroup,
 690                                                 *pp_username)) {
 691                 int saved_errno = errno;
 692                 DEBUG(3, (" Failed to add server to cache\n"));
 693                 errno = saved_errno;
 694                 if (errno == 0) {
 695                         errno = ENOMEM;
 696                 }
 697                 SAFE_FREE(srv);
 698                 return NULL;
 699         }
 700
 701         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 702                 server, share, srv));
 703
 704         DLIST_ADD(context->internal->servers, srv);
 705         return srv;
 706 }
 707
 708 /*
 709  * Connect to a server for getting/setting attributes, possibly on an existing
 710  * connection.  This works similarly to SMBC_server().
 711  */
 712 SMBCSRV *
 713 SMBC_attr_server(TALLOC_CTX *ctx,
 714                  SMBCCTX *context,
 715                  const char *server,
 716                  uint16_t port,
 717                  const char *share,
 718                  char **pp_workgroup,
 719                  char **pp_username,
 720                  char **pp_password)
 721 {
 722         int flags;
 723         struct cli_state *ipc_cli = NULL;
 724         struct rpc_pipe_client *pipe_hnd = NULL;
 725         NTSTATUS nt_status;
 726         SMBCSRV *srv=NULL;
 727         SMBCSRV *ipc_srv=NULL;
 728
 729         /*
 730          * Use srv->cli->desthost and srv->cli->share instead of
 731          * server and share below to connect to the actual share,
 732          * i.e., a normal share or a referred share from
 733          * 'msdfs proxy' share.
 734          */
 735         srv = SMBC_server(ctx, context, true, server, port, share,
 736                         pp_workgroup, pp_username, pp_password);
 737         if (!srv) {
 738                 return NULL;
 739         }
 740         server = smbXcli_conn_remote_name(srv->cli->conn);
 741         share = srv->cli->share;
 742
 743         /*
 744          * See if we've already created this special connection.  Reference
 745          * our "special" share name '*IPC$', which is an impossible real share
 746          * name due to the leading asterisk.
 747          */
 748         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 749                                    pp_workgroup, pp_username, pp_password);
 750         if (!ipc_srv) {
 751                 int signing_state = SMB_SIGNING_DEFAULT;
 752
 753                 /* We didn't find a cached connection.  Get the password */
 754                 if (!*pp_password || (*pp_password)[0] == '\0') {
 755                         /* ... then retrieve it now. */
 756                         SMBC_call_auth_fn(ctx, context, server, share,
 757                                           pp_workgroup,
 758                                           pp_username,
 759                                           pp_password);
 760                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 761                                 errno = ENOMEM;
 762                                 return NULL;
 763                         }
 764                 }
 765
 766                 flags = 0;
 767                 if (smbc_getOptionUseKerberos(context)) {
 768                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 769                 }
 770                 if (smbc_getOptionUseCCache(context)) {
 771                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 772                 }
 773                 if (context->internal->smb_encryption_level != SMBC_ENCRYPTLEVEL_NONE) {
 774                         signing_state = SMB_SIGNING_REQUIRED;
 775                 }
 776
 777                 nt_status = cli_full_connection(&ipc_cli,
 778                                                 lp_netbios_name(), server,
 779                                                 NULL, 0, "IPC$", "?????",
 780                                                 *pp_username,
 781                                                 *pp_workgroup,
 782                                                 *pp_password,
 783                                                 flags,
 784                                                 signing_state);
 785                 if (! NT_STATUS_IS_OK(nt_status)) {
 786                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 787                                  nt_errstr(nt_status)));
 788                         errno = ENOTSUP;
 789                         return NULL;
 790                 }
 791
 792                 if (context->internal->smb_encryption_level) {
 793                         /* Attempt UNIX smb encryption. */
 794                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 795                                                                   *pp_username,
 796                                                                   *pp_password,
 797                                                                   *pp_workgroup))) {
 798
 799                                 /*
 800                                  * context->smb_encryption_level ==
 801                                  * 1 means don't fail if encryption can't be
 802                                  * negotiated, == 2 means fail if encryption
 803                                  * can't be negotiated.
 804                                  */
 805
 806                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 807
 808                                 if (context->internal->smb_encryption_level == 2) {
 809                                         cli_shutdown(ipc_cli);
 810                                         errno = EPERM;
 811                                         return NULL;
 812                                 }
 813                         }
 814                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 815                 }
 816
 817                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 818                 if (!ipc_srv) {
 819                         errno = ENOMEM;
 820                         cli_shutdown(ipc_cli);
 821                         return NULL;
 822                 }
 823
 824                 ZERO_STRUCTP(ipc_srv);
 825                 DLIST_ADD(ipc_srv->cli, ipc_cli);
 826
 827                 nt_status = cli_rpc_pipe_open_noauth(
 828                         ipc_srv->cli, &ndr_table_lsarpc, &pipe_hnd);
 829                 if (!NT_STATUS_IS_OK(nt_status)) {
 830                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 831                         errno = ENOTSUP;
 832                         cli_shutdown(ipc_srv->cli);
 833                         free(ipc_srv);
 834                         return NULL;
 835                 }
 836
 837                 /*
 838                  * Some systems don't support
 839                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 840                  * so we might as well do it too.
 841                  */
 842
 843                 nt_status = rpccli_lsa_open_policy(
 844                         pipe_hnd,
 845                         talloc_tos(),
 846                         True,
 847                         GENERIC_EXECUTE_ACCESS,
 848                         &ipc_srv->pol);
 849
 850                 if (!NT_STATUS_IS_OK(nt_status)) {
 851                         errno = SMBC_errno(context, ipc_srv->cli);
 852                         cli_shutdown(ipc_srv->cli);
 853                         free(ipc_srv);
 854                         return NULL;
 855                 }
 856
 857                 /* now add it to the cache (internal or external) */
 858
 859                 errno = 0;      /* let cache function set errno if it likes */
 860                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 861                                                              server,
 862                                                              "*IPC$",
 863                                                              *pp_workgroup,
 864                                                              *pp_username)) {
 865                         DEBUG(3, (" Failed to add server to cache\n"));
 866                         if (errno == 0) {
 867                                 errno = ENOMEM;
 868                         }
 869                         cli_shutdown(ipc_srv->cli);
 870                         free(ipc_srv);
 871                         return NULL;
 872                 }
 873
 874                 DLIST_ADD(context->internal->servers, ipc_srv);
 875         }
 876
 877         return ipc_srv;
 878 }