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
  36 /*
  37  * Check a server for being alive and well.
  38  * returns 0 if the server is in shape. Returns 1 on error
  39  *
  40  * Also useable outside libsmbclient to enable external cache
  41  * to do some checks too.
  42  */
  43 int
  44 SMBC_check_server(SMBCCTX * context,
  45                   SMBCSRV * server)
  46 {
  47         if (!cli_state_is_connected(server->cli)) {
  48                 return 1;
  49         }
  50
  51         return 0;
  52 }
  53
  54 /*
  55  * Remove a server from the cached server list it's unused.
  56  * On success, 0 is returned. 1 is returned if the server could not be removed.
  57  *
  58  * Also useable outside libsmbclient
  59  */
  60 int
  61 SMBC_remove_unused_server(SMBCCTX * context,
  62                           SMBCSRV * srv)
  63 {
  64         SMBCFILE * file;
  65
  66         /* are we being fooled ? */
  67         if (!context || !context->internal->initialized || !srv) {
  68                 return 1;
  69         }
  70
  71         /* Check all open files/directories for a relation with this server */
  72         for (file = context->internal->files; file; file = file->next) {
  73                 if (file->srv == srv) {
  74                         /* Still used */
  75                         DEBUG(3, ("smbc_remove_usused_server: "
  76                                   "%p still used by %p.\n",
  77                                   srv, file));
  78                         return 1;
  79                 }
  80         }
  81
  82         DLIST_REMOVE(context->internal->servers, srv);
  83
  84         cli_shutdown(srv->cli);
  85         srv->cli = NULL;
  86
  87         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  88
  89         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  90
  91         SAFE_FREE(srv);
  92         return 0;
  93 }
  94
  95 /****************************************************************
  96  * Call the auth_fn with fixed size (fstring) buffers.
  97  ***************************************************************/
  98 void
  99 SMBC_call_auth_fn(TALLOC_CTX *ctx,
 100                   SMBCCTX *context,
 101                   const char *server,
 102                   const char *share,
 103                   char **pp_workgroup,
 104                   char **pp_username,
 105                   char **pp_password)
 106 {
 107         fstring workgroup;
 108         fstring username;
 109         fstring password;
 110         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 111
 112         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 113         strlcpy(username, *pp_username, sizeof(username));
 114         strlcpy(password, *pp_password, sizeof(password));
 115
 116         /* See if there's an authentication with context function provided */
 117         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 118         if (auth_with_context_fn)
 119         {
 120             (* auth_with_context_fn)(context,
 121                                      server, share,
 122                                      workgroup, sizeof(workgroup),
 123                                      username, sizeof(username),
 124                                      password, sizeof(password));
 125         }
 126         else
 127         {
 128             smbc_getFunctionAuthData(context)(server, share,
 129                                               workgroup, sizeof(workgroup),
 130                                               username, sizeof(username),
 131                                               password, sizeof(password));
 132         }
 133
 134         TALLOC_FREE(*pp_workgroup);
 135         TALLOC_FREE(*pp_username);
 136         TALLOC_FREE(*pp_password);
 137
 138         *pp_workgroup = talloc_strdup(ctx, workgroup);
 139         *pp_username = talloc_strdup(ctx, username);
 140         *pp_password = talloc_strdup(ctx, password);
 141 }
 142
 143
 144 void
 145 SMBC_get_auth_data(const char *server, const char *share,
 146                    char *workgroup_buf, int workgroup_buf_len,
 147                    char *username_buf, int username_buf_len,
 148                    char *password_buf, int password_buf_len)
 149 {
 150         /* Default function just uses provided data.  Nothing to do. */
 151 }
 152
 153
 154
 155 SMBCSRV *
 156 SMBC_find_server(TALLOC_CTX *ctx,
 157                  SMBCCTX *context,
 158                  const char *server,
 159                  const char *share,
 160                  char **pp_workgroup,
 161                  char **pp_username,
 162                  char **pp_password)
 163 {
 164         SMBCSRV *srv;
 165         int auth_called = 0;
 166
 167         if (!pp_workgroup || !pp_username || !pp_password) {
 168                 return NULL;
 169         }
 170
 171 check_server_cache:
 172
 173         srv = smbc_getFunctionGetCachedServer(context)(context,
 174                                                        server, share,
 175                                                        *pp_workgroup,
 176                                                        *pp_username);
 177
 178         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 179                                      !*pp_password || !(*pp_password)[0])) {
 180                 SMBC_call_auth_fn(ctx, context, server, share,
 181                                   pp_workgroup, pp_username, pp_password);
 182
 183                 /*
 184                  * However, smbc_auth_fn may have picked up info relating to
 185                  * an existing connection, so try for an existing connection
 186                  * again ...
 187                  */
 188                 auth_called = 1;
 189                 goto check_server_cache;
 190
 191         }
 192
 193         if (srv) {
 194                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 195                         /*
 196                          * This server is no good anymore
 197                          * Try to remove it and check for more possible
 198                          * servers in the cache
 199                          */
 200                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 201                                                                         srv)) {
 202                                 /*
 203                                  * We could not remove the server completely,
 204                                  * remove it from the cache so we will not get
 205                                  * it again. It will be removed when the last
 206                                  * file/dir is closed.
 207                                  */
 208                                 smbc_getFunctionRemoveCachedServer(context)(context,
 209                                                                             srv);
 210                         }
 211
 212                         /*
 213                          * Maybe there are more cached connections to this
 214                          * server
 215                          */
 216                         goto check_server_cache;
 217                 }
 218
 219                 return srv;
 220         }
 221
 222         return NULL;
 223 }
 224
 225 /*
 226  * Connect to a server, possibly on an existing connection
 227  *
 228  * Here, what we want to do is: If the server and username
 229  * match an existing connection, reuse that, otherwise, establish a
 230  * new connection.
 231  *
 232  * If we have to create a new connection, call the auth_fn to get the
 233  * info we need, unless the username and password were passed in.
 234  */
 235
 236 static SMBCSRV *
 237 SMBC_server_internal(TALLOC_CTX *ctx,
 238             SMBCCTX *context,
 239             bool connect_if_not_found,
 240             const char *server,
 241             const char *share,
 242             char **pp_workgroup,
 243             char **pp_username,
 244             char **pp_password,
 245             bool *in_cache)
 246 {
 247         SMBCSRV *srv=NULL;
 248         char *workgroup = NULL;
 249         struct cli_state *c = NULL;
 250         const char *server_n = server;
 251         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 252         uint32 fs_attrs = 0;
 253         const char *username_used;
 254         NTSTATUS status;
 255         char *newserver, *newshare;
 256         int flags = 0;
 257
 258         ZERO_STRUCT(c);
 259         *in_cache = false;
 260
 261         if (server[0] == 0) {
 262                 errno = EPERM;
 263                 return NULL;
 264         }
 265
 266         /* Look for a cached connection */
 267         srv = SMBC_find_server(ctx, context, server, share,
 268                                pp_workgroup, pp_username, pp_password);
 269
 270         /*
 271          * If we found a connection and we're only allowed one share per
 272          * server...
 273          */
 274         if (srv &&
 275             *share != '\0' &&
 276             smbc_getOptionOneSharePerServer(context)) {
 277
 278                 /*
 279                  * ... then if there's no current connection to the share,
 280                  * connect to it.  SMBC_find_server(), or rather the function
 281                  * pointed to by context->get_cached_srv_fn which
 282                  * was called by SMBC_find_server(), will have issued a tree
 283                  * disconnect if the requested share is not the same as the
 284                  * one that was already connected.
 285                  */
 286
 287                 /*
 288                  * Use srv->cli->desthost and srv->cli->share instead of
 289                  * server and share below to connect to the actual share,
 290                  * i.e., a normal share or a referred share from
 291                  * 'msdfs proxy' share.
 292                  */
 293                 if (!cli_state_has_tcon(srv->cli)) {
 294                         /* Ensure we have accurate auth info */
 295                         SMBC_call_auth_fn(ctx, context,
 296                                           cli_state_remote_name(srv->cli),
 297                                           srv->cli->share,
 298                                           pp_workgroup,
 299                                           pp_username,
 300                                           pp_password);
 301
 302                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 303                                 errno = ENOMEM;
 304                                 cli_shutdown(srv->cli);
 305                                 srv->cli = NULL;
 306                                 smbc_getFunctionRemoveCachedServer(context)(context,
 307                                                                             srv);
 308                                 return NULL;
 309                         }
 310
 311                         /*
 312                          * We don't need to renegotiate encryption
 313                          * here as the encryption context is not per
 314                          * tid.
 315                          */
 316
 317                         status = cli_tree_connect(srv->cli,
 318                                                   srv->cli->share,
 319                                                   "?????",
 320                                                   *pp_password,
 321                                                   strlen(*pp_password)+1);
 322                         if (!NT_STATUS_IS_OK(status)) {
 323                                 errno = map_errno_from_nt_status(status);
 324                                 cli_shutdown(srv->cli);
 325                                 srv->cli = NULL;
 326                                 smbc_getFunctionRemoveCachedServer(context)(context,
 327                                                                             srv);
 328                                 srv = NULL;
 329                         }
 330
 331                         /* Determine if this share supports case sensitivity */
 332                         if (is_ipc) {
 333                                 DEBUG(4,
 334                                       ("IPC$ so ignore case sensitivity\n"));
 335                                 status = NT_STATUS_OK;
 336                         } else {
 337                                 status = cli_get_fs_attr_info(c, &fs_attrs);
 338                         }
 339
 340                         if (!NT_STATUS_IS_OK(status)) {
 341                                 DEBUG(4, ("Could not retrieve "
 342                                           "case sensitivity flag: %s.\n",
 343                                           nt_errstr(status)));
 344
 345                                 /*
 346                                  * We can't determine the case sensitivity of
 347                                  * the share. We have no choice but to use the
 348                                  * user-specified case sensitivity setting.
 349                                  */
 350                                 if (smbc_getOptionCaseSensitive(context)) {
 351                                         cli_set_case_sensitive(c, True);
 352                                 } else {
 353                                         cli_set_case_sensitive(c, False);
 354                                 }
 355                         } else if (!is_ipc) {
 356                                 DEBUG(4,
 357                                       ("Case sensitive: %s\n",
 358                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 359                                         ? "True"
 360                                         : "False")));
 361                                 cli_set_case_sensitive(
 362                                         c,
 363                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 364                                          ? True
 365                                          : False));
 366                         }
 367
 368                         /*
 369                          * Regenerate the dev value since it's based on both
 370                          * server and share
 371                          */
 372                         if (srv) {
 373                                 const char *remote_name =
 374                                         cli_state_remote_name(srv->cli);
 375
 376                                 srv->dev = (dev_t)(str_checksum(remote_name) ^
 377                                                    str_checksum(srv->cli->share));
 378                         }
 379                 }
 380         }
 381
 382         /* If we have a connection... */
 383         if (srv) {
 384
 385                 /* ... then we're done here.  Give 'em what they came for. */
 386                 *in_cache = true;
 387                 goto done;
 388         }
 389
 390         /* If we're not asked to connect when a connection doesn't exist... */
 391         if (! connect_if_not_found) {
 392                 /* ... then we're done here. */
 393                 return NULL;
 394         }
 395
 396         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 397                 errno = ENOMEM;
 398                 return NULL;
 399         }
 400
 401         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 402
 403         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 404
 405         status = NT_STATUS_UNSUCCESSFUL;
 406
 407         if (smbc_getOptionUseKerberos(context)) {
 408                 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 409         }
 410
 411         if (smbc_getOptionFallbackAfterKerberos(context)) {
 412                 flags |= CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS;
 413         }
 414
 415         if (smbc_getOptionUseCCache(context)) {
 416                 flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 417         }
 418
 419         if (share == NULL || *share == '\0' || is_ipc) {
 420                 /*
 421                  * Try 139 first for IPC$
 422                  */
 423                 status = cli_connect_nb(server_n, NULL, NBT_SMB_PORT, 0x20,
 424                                         smbc_getNetbiosName(context),
 425                                         SMB_SIGNING_DEFAULT, flags, &c);
 426         }
 427
 428         if (!NT_STATUS_IS_OK(status)) {
 429                 /*
 430                  * No IPC$ or 139 did not work
 431                  */
 432                 status = cli_connect_nb(server_n, NULL, 0, 0x20,
 433                                         smbc_getNetbiosName(context),
 434                                         SMB_SIGNING_DEFAULT, flags, &c);
 435         }
 436
 437         if (!NT_STATUS_IS_OK(status)) {
 438                 errno = map_errno_from_nt_status(status);
 439                 return NULL;
 440         }
 441
 442         cli_set_timeout(c, smbc_getTimeout(context));
 443
 444         status = cli_negprot(c, PROTOCOL_NT1);
 445
 446         if (!NT_STATUS_IS_OK(status)) {
 447                 cli_shutdown(c);
 448                 errno = ETIMEDOUT;
 449                 return NULL;
 450         }
 451
 452         username_used = *pp_username;
 453
 454         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 455                                                *pp_password,
 456                                                strlen(*pp_password),
 457                                                *pp_password,
 458                                                strlen(*pp_password),
 459                                                *pp_workgroup))) {
 460
 461                 /* Failed.  Try an anonymous login, if allowed by flags. */
 462                 username_used = "";
 463
 464                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 465                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 466                                                        *pp_password, 1,
 467                                                        *pp_password, 0,
 468                                                        *pp_workgroup))) {
 469
 470                         cli_shutdown(c);
 471                         errno = EPERM;
 472                         return NULL;
 473                 }
 474         }
 475
 476         status = cli_init_creds(c, username_used,
 477                                 *pp_workgroup, *pp_password);
 478         if (!NT_STATUS_IS_OK(status)) {
 479                 errno = map_errno_from_nt_status(status);
 480                 cli_shutdown(c);
 481                 return NULL;
 482         }
 483
 484         DEBUG(4,(" session setup ok\n"));
 485
 486         /* here's the fun part....to support 'msdfs proxy' shares
 487            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 488            here before trying to connect to the original share.
 489            cli_check_msdfs_proxy() will fail if it is a normal share. */
 490
 491         if ((cli_state_capabilities(c) & CAP_DFS) &&
 492                         cli_check_msdfs_proxy(ctx, c, share,
 493                                 &newserver, &newshare,
 494                                 /* FIXME: cli_check_msdfs_proxy() does
 495                                    not support smbc_smb_encrypt_level type */
 496                                 context->internal->smb_encryption_level ?
 497                                         true : false,
 498                                 *pp_username,
 499                                 *pp_password,
 500                                 *pp_workgroup)) {
 501                 cli_shutdown(c);
 502                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 503                                 newserver, newshare, pp_workgroup,
 504                                 pp_username, pp_password, in_cache);
 505                 TALLOC_FREE(newserver);
 506                 TALLOC_FREE(newshare);
 507                 return srv;
 508         }
 509
 510         /* must be a normal share */
 511
 512         status = cli_tree_connect(c, share, "?????", *pp_password,
 513                                   strlen(*pp_password)+1);
 514         if (!NT_STATUS_IS_OK(status)) {
 515                 errno = map_errno_from_nt_status(status);
 516                 cli_shutdown(c);
 517                 return NULL;
 518         }
 519
 520         DEBUG(4,(" tconx ok\n"));
 521
 522         /* Determine if this share supports case sensitivity */
 523         if (is_ipc) {
 524                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 525                 status = NT_STATUS_OK;
 526         } else {
 527                 status = cli_get_fs_attr_info(c, &fs_attrs);
 528         }
 529
 530         if (!NT_STATUS_IS_OK(status)) {
 531                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 532                           nt_errstr(status)));
 533
 534                 /*
 535                  * We can't determine the case sensitivity of the share. We
 536                  * have no choice but to use the user-specified case
 537                  * sensitivity setting.
 538                  */
 539                 if (smbc_getOptionCaseSensitive(context)) {
 540                         cli_set_case_sensitive(c, True);
 541                 } else {
 542                         cli_set_case_sensitive(c, False);
 543                 }
 544         } else if (!is_ipc) {
 545                 DEBUG(4, ("Case sensitive: %s\n",
 546                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 547                            ? "True"
 548                            : "False")));
 549                 cli_set_case_sensitive(c,
 550                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 551                                         ? True
 552                                         : False));
 553         }
 554
 555         if (context->internal->smb_encryption_level) {
 556                 /* Attempt UNIX smb encryption. */
 557                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 558                                                           username_used,
 559                                                           *pp_password,
 560                                                           *pp_workgroup))) {
 561
 562                         /*
 563                          * context->smb_encryption_level == 1
 564                          * means don't fail if encryption can't be negotiated,
 565                          * == 2 means fail if encryption can't be negotiated.
 566                          */
 567
 568                         DEBUG(4,(" SMB encrypt failed\n"));
 569
 570                         if (context->internal->smb_encryption_level == 2) {
 571                                 cli_shutdown(c);
 572                                 errno = EPERM;
 573                                 return NULL;
 574                         }
 575                 }
 576                 DEBUG(4,(" SMB encrypt ok\n"));
 577         }
 578
 579         /*
 580          * Ok, we have got a nice connection
 581          * Let's allocate a server structure.
 582          */
 583
 584         srv = SMB_MALLOC_P(SMBCSRV);
 585         if (!srv) {
 586                 cli_shutdown(c);
 587                 errno = ENOMEM;
 588                 return NULL;
 589         }
 590
 591         ZERO_STRUCTP(srv);
 592         srv->cli = c;
 593         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 594         srv->no_pathinfo = False;
 595         srv->no_pathinfo2 = False;
 596         srv->no_nt_session = False;
 597
 598 done:
 599         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 600                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 601         } else {
 602                 workgroup = *pp_workgroup;
 603         }
 604         if(!workgroup) {
 605                 if (c != NULL) {
 606                         cli_shutdown(c);
 607                 }
 608                 SAFE_FREE(srv);
 609                 return NULL;
 610         }
 611
 612         /* set the credentials to make DFS work */
 613         smbc_set_credentials_with_fallback(context,
 614                                            workgroup,
 615                                            *pp_username,
 616                                            *pp_password);
 617
 618         return srv;
 619 }
 620
 621 SMBCSRV *
 622 SMBC_server(TALLOC_CTX *ctx,
 623                 SMBCCTX *context,
 624                 bool connect_if_not_found,
 625                 const char *server,
 626                 const char *share,
 627                 char **pp_workgroup,
 628                 char **pp_username,
 629                 char **pp_password)
 630 {
 631         SMBCSRV *srv=NULL;
 632         bool in_cache = false;
 633
 634         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 635                         server, share, pp_workgroup,
 636                         pp_username, pp_password, &in_cache);
 637
 638         if (!srv) {
 639                 return NULL;
 640         }
 641         if (in_cache) {
 642                 return srv;
 643         }
 644
 645         /* Now add it to the cache (internal or external)  */
 646         /* Let the cache function set errno if it wants to */
 647         errno = 0;
 648         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 649                                                 server, share,
 650                                                 *pp_workgroup,
 651                                                 *pp_username)) {
 652                 int saved_errno = errno;
 653                 DEBUG(3, (" Failed to add server to cache\n"));
 654                 errno = saved_errno;
 655                 if (errno == 0) {
 656                         errno = ENOMEM;
 657                 }
 658                 SAFE_FREE(srv);
 659                 return NULL;
 660         }
 661
 662         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 663                 server, share, srv));
 664
 665         DLIST_ADD(context->internal->servers, srv);
 666         return srv;
 667 }
 668
 669 /*
 670  * Connect to a server for getting/setting attributes, possibly on an existing
 671  * connection.  This works similarly to SMBC_server().
 672  */
 673 SMBCSRV *
 674 SMBC_attr_server(TALLOC_CTX *ctx,
 675                  SMBCCTX *context,
 676                  const char *server,
 677                  const char *share,
 678                  char **pp_workgroup,
 679                  char **pp_username,
 680                  char **pp_password)
 681 {
 682         int flags;
 683         struct cli_state *ipc_cli = NULL;
 684         struct rpc_pipe_client *pipe_hnd = NULL;
 685         NTSTATUS nt_status;
 686         SMBCSRV *srv=NULL;
 687         SMBCSRV *ipc_srv=NULL;
 688
 689         /*
 690          * Use srv->cli->desthost and srv->cli->share instead of
 691          * server and share below to connect to the actual share,
 692          * i.e., a normal share or a referred share from
 693          * 'msdfs proxy' share.
 694          */
 695         srv = SMBC_server(ctx, context, true, server, share,
 696                         pp_workgroup, pp_username, pp_password);
 697         if (!srv) {
 698                 return NULL;
 699         }
 700         server = cli_state_remote_name(srv->cli);
 701         share = srv->cli->share;
 702
 703         /*
 704          * See if we've already created this special connection.  Reference
 705          * our "special" share name '*IPC$', which is an impossible real share
 706          * name due to the leading asterisk.
 707          */
 708         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 709                                    pp_workgroup, pp_username, pp_password);
 710         if (!ipc_srv) {
 711
 712                 /* We didn't find a cached connection.  Get the password */
 713                 if (!*pp_password || (*pp_password)[0] == '\0') {
 714                         /* ... then retrieve it now. */
 715                         SMBC_call_auth_fn(ctx, context, server, share,
 716                                           pp_workgroup,
 717                                           pp_username,
 718                                           pp_password);
 719                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 720                                 errno = ENOMEM;
 721                                 return NULL;
 722                         }
 723                 }
 724
 725                 flags = 0;
 726                 if (smbc_getOptionUseKerberos(context)) {
 727                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 728                 }
 729                 if (smbc_getOptionUseCCache(context)) {
 730                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 731                 }
 732
 733                 nt_status = cli_full_connection(&ipc_cli,
 734                                                 lp_netbios_name(), server,
 735                                                 NULL, 0, "IPC$", "?????",
 736                                                 *pp_username,
 737                                                 *pp_workgroup,
 738                                                 *pp_password,
 739                                                 flags,
 740                                                 SMB_SIGNING_DEFAULT);
 741                 if (! NT_STATUS_IS_OK(nt_status)) {
 742                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 743                                  nt_errstr(nt_status)));
 744                         errno = ENOTSUP;
 745                         return NULL;
 746                 }
 747
 748                 if (context->internal->smb_encryption_level) {
 749                         /* Attempt UNIX smb encryption. */
 750                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 751                                                                   *pp_username,
 752                                                                   *pp_password,
 753                                                                   *pp_workgroup))) {
 754
 755                                 /*
 756                                  * context->smb_encryption_level ==
 757                                  * 1 means don't fail if encryption can't be
 758                                  * negotiated, == 2 means fail if encryption
 759                                  * can't be negotiated.
 760                                  */
 761
 762                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 763
 764                                 if (context->internal->smb_encryption_level == 2) {
 765                                         cli_shutdown(ipc_cli);
 766                                         errno = EPERM;
 767                                         return NULL;
 768                                 }
 769                         }
 770                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 771                 }
 772
 773                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 774                 if (!ipc_srv) {
 775                         errno = ENOMEM;
 776                         cli_shutdown(ipc_cli);
 777                         return NULL;
 778                 }
 779
 780                 ZERO_STRUCTP(ipc_srv);
 781                 ipc_srv->cli = ipc_cli;
 782
 783                 nt_status = cli_rpc_pipe_open_noauth(
 784                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 785                 if (!NT_STATUS_IS_OK(nt_status)) {
 786                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 787                         errno = ENOTSUP;
 788                         cli_shutdown(ipc_srv->cli);
 789                         free(ipc_srv);
 790                         return NULL;
 791                 }
 792
 793                 /*
 794                  * Some systems don't support
 795                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 796                  * so we might as well do it too.
 797                  */
 798
 799                 nt_status = rpccli_lsa_open_policy(
 800                         pipe_hnd,
 801                         talloc_tos(),
 802                         True,
 803                         GENERIC_EXECUTE_ACCESS,
 804                         &ipc_srv->pol);
 805
 806                 if (!NT_STATUS_IS_OK(nt_status)) {
 807                         errno = SMBC_errno(context, ipc_srv->cli);
 808                         cli_shutdown(ipc_srv->cli);
 809                         return NULL;
 810                 }
 811
 812                 /* now add it to the cache (internal or external) */
 813
 814                 errno = 0;      /* let cache function set errno if it likes */
 815                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 816                                                              server,
 817                                                              "*IPC$",
 818                                                              *pp_workgroup,
 819                                                              *pp_username)) {
 820                         DEBUG(3, (" Failed to add server to cache\n"));
 821                         if (errno == 0) {
 822                                 errno = ENOMEM;
 823                         }
 824                         cli_shutdown(ipc_srv->cli);
 825                         free(ipc_srv);
 826                         return NULL;
 827                 }
 828
 829                 DLIST_ADD(context->internal->servers, ipc_srv);
 830         }
 831
 832         return ipc_srv;
 833 }