source3/libsmb/clientgen.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client generic functions
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Jeremy Allison 2007.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "libsmb/libsmb.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "smb_signing.h"
  25 #include "async_smb.h"
  26
  27 /*******************************************************************
  28  Setup the word count and byte count for a client smb message.
  29 ********************************************************************/
  30
  31 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  32 {
  33         if (zero && (num_words || num_bytes)) {
  34                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  35         }
  36         SCVAL(buf,smb_wct,num_words);
  37         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  38         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  39         return (smb_size + num_words*2 + num_bytes);
  40 }
  41
  42 /****************************************************************************
  43  Change the timeout (in milliseconds).
  44 ****************************************************************************/
  45
  46 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  47 {
  48         unsigned int old_timeout = cli->timeout;
  49         cli->timeout = timeout;
  50         return old_timeout;
  51 }
  52
  53 /****************************************************************************
  54  convenience routine to find if we negotiated ucs2
  55 ****************************************************************************/
  56
  57 bool cli_ucs2(struct cli_state *cli)
  58 {
  59         return ((cli->capabilities & CAP_UNICODE) != 0);
  60 }
  61
  62 /****************************************************************************
  63  Setup basics in a outgoing packet.
  64 ****************************************************************************/
  65
  66 void cli_setup_packet_buf(struct cli_state *cli, char *buf)
  67 {
  68         uint16 flags2;
  69         cli->rap_error = 0;
  70         SIVAL(buf,smb_rcls,0);
  71         SSVAL(buf,smb_pid,cli->smb1.pid);
  72         memset(buf+smb_pidhigh, 0, 12);
  73         SSVAL(buf,smb_uid, cli_state_get_uid(cli));
  74         SSVAL(buf,smb_mid,cli->smb1.mid);
  75
  76         if (cli->protocol <= PROTOCOL_CORE) {
  77                 return;
  78         }
  79
  80         if (cli->case_sensitive) {
  81                 SCVAL(buf,smb_flg,0x0);
  82         } else {
  83                 /* Default setting, case insensitive. */
  84                 SCVAL(buf,smb_flg,0x8);
  85         }
  86         flags2 = FLAGS2_LONG_PATH_COMPONENTS;
  87         if (cli->capabilities & CAP_UNICODE)
  88                 flags2 |= FLAGS2_UNICODE_STRINGS;
  89         if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
  90                 flags2 |= FLAGS2_DFS_PATHNAMES;
  91         if (cli->capabilities & CAP_STATUS32)
  92                 flags2 |= FLAGS2_32_BIT_ERROR_CODES;
  93         if (cli->use_spnego)
  94                 flags2 |= FLAGS2_EXTENDED_SECURITY;
  95         SSVAL(buf,smb_flg2, flags2);
  96 }
  97
  98 /****************************************************************************
  99  Initialize Domain, user or password.
 100 ****************************************************************************/
 101
 102 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
 103 {
 104         TALLOC_FREE(cli->domain);
 105         cli->domain = talloc_strdup(cli, domain ? domain : "");
 106         if (cli->domain == NULL) {
 107                 return NT_STATUS_NO_MEMORY;
 108         }
 109         return NT_STATUS_OK;
 110 }
 111
 112 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
 113 {
 114         TALLOC_FREE(cli->user_name);
 115         cli->user_name = talloc_strdup(cli, username ? username : "");
 116         if (cli->user_name == NULL) {
 117                 return NT_STATUS_NO_MEMORY;
 118         }
 119         return NT_STATUS_OK;
 120 }
 121
 122 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
 123 {
 124         TALLOC_FREE(cli->password);
 125
 126         /* Password can be NULL. */
 127         if (password) {
 128                 cli->password = talloc_strdup(cli, password);
 129                 if (cli->password == NULL) {
 130                         return NT_STATUS_NO_MEMORY;
 131                 }
 132         } else {
 133                 /* Use zero NTLMSSP hashes and session key. */
 134                 cli->password = NULL;
 135         }
 136
 137         return NT_STATUS_OK;
 138 }
 139
 140 /****************************************************************************
 141  Initialise credentials of a client structure.
 142 ****************************************************************************/
 143
 144 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 145 {
 146         NTSTATUS status = cli_set_username(cli, username);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 return status;
 149         }
 150         status = cli_set_domain(cli, domain);
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 return status;
 153         }
 154         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 155
 156         return cli_set_password(cli, password);
 157 }
 158
 159 /****************************************************************************
 160  Initialise a client structure. Always returns a talloc'ed struct.
 161  Set the signing state (used from the command line).
 162 ****************************************************************************/
 163
 164 struct cli_state *cli_state_create(TALLOC_CTX *mem_ctx,
 165                                    int fd,
 166                                    const char *desthost,
 167                                    int signing_state)
 168 {
 169         struct cli_state *cli = NULL;
 170         bool allow_smb_signing = false;
 171         bool mandatory_signing = false;
 172         socklen_t ss_length;
 173         int ret;
 174
 175         /* Check the effective uid - make sure we are not setuid */
 176         if (is_setuid_root()) {
 177                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 178                 return NULL;
 179         }
 180
 181         cli = talloc_zero(mem_ctx, struct cli_state);
 182         if (!cli) {
 183                 return NULL;
 184         }
 185
 186         cli->dfs_mountpoint = talloc_strdup(cli, "");
 187         if (!cli->dfs_mountpoint) {
 188                 goto error;
 189         }
 190         cli->fd = -1;
 191         cli->raw_status = NT_STATUS_INTERNAL_ERROR;
 192         cli->protocol = PROTOCOL_NT1;
 193         cli->timeout = 20000; /* Timeout is in milliseconds. */
 194         cli->max_xmit = CLI_BUFFER_SIZE+4;
 195         cli->case_sensitive = false;
 196
 197         cli->use_spnego = lp_client_use_spnego();
 198
 199         cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
 200
 201         /* Set the CLI_FORCE_DOSERR environment variable to test
 202            client routines using DOS errors instead of STATUS32
 203            ones.  This intended only as a temporary hack. */
 204         if (getenv("CLI_FORCE_DOSERR"))
 205                 cli->force_dos_errors = true;
 206
 207         if (lp_client_signing()) {
 208                 allow_smb_signing = true;
 209         }
 210
 211         if (lp_client_signing() == Required) {
 212                 mandatory_signing = true;
 213         }
 214
 215         if (signing_state != Undefined) {
 216                 allow_smb_signing = true;
 217         }
 218
 219         if (signing_state == false) {
 220                 allow_smb_signing = false;
 221                 mandatory_signing = false;
 222         }
 223
 224         if (signing_state == Required) {
 225                 mandatory_signing = true;
 226         }
 227
 228         /* initialise signing */
 229         cli->signing_state = smb_signing_init(cli,
 230                                               allow_smb_signing,
 231                                               mandatory_signing);
 232         if (!cli->signing_state) {
 233                 goto error;
 234         }
 235
 236         cli->conn.outgoing = tevent_queue_create(cli, "cli_outgoing");
 237         if (cli->conn.outgoing == NULL) {
 238                 goto error;
 239         }
 240         cli->conn.pending = NULL;
 241
 242         cli->desthost = talloc_strdup(cli, desthost);
 243         if (cli->desthost == NULL) {
 244                 goto error;
 245         }
 246
 247         cli->fd = fd;
 248
 249         ss_length = sizeof(cli->src_ss);
 250         ret = getsockname(fd,
 251                           (struct sockaddr *)(void *)&cli->src_ss,
 252                           &ss_length);
 253         if (ret == -1) {
 254                 goto error;
 255         }
 256         ss_length = sizeof(cli->dest_ss);
 257         ret = getpeername(fd,
 258                           (struct sockaddr *)(void *)&cli->dest_ss,
 259                           &ss_length);
 260         if (ret == -1) {
 261                 goto error;
 262         }
 263
 264         cli->smb1.mid = 1;
 265         cli->smb1.pid = (uint16_t)sys_getpid();
 266         cli->smb1.vc_num = cli->smb1.pid;
 267         cli->smb1.tid = UINT16_MAX;
 268         cli->smb1.uid = UID_FIELD_INVALID;
 269
 270         cli->initialised = 1;
 271         return cli;
 272
 273         /* Clean up after malloc() error */
 274
 275  error:
 276
 277         TALLOC_FREE(cli);
 278         return NULL;
 279 }
 280
 281 bool cli_state_encryption_on(struct cli_state *cli)
 282 {
 283         return common_encryption_on(cli->trans_enc_state);
 284 }
 285
 286
 287 /****************************************************************************
 288  Close all pipes open on this session.
 289 ****************************************************************************/
 290
 291 void cli_nt_pipes_close(struct cli_state *cli)
 292 {
 293         while (cli->pipe_list != NULL) {
 294                 /*
 295                  * No TALLOC_FREE here!
 296                  */
 297                 talloc_free(cli->pipe_list);
 298         }
 299 }
 300
 301 /****************************************************************************
 302  Shutdown a client structure.
 303 ****************************************************************************/
 304
 305 static void _cli_shutdown(struct cli_state *cli)
 306 {
 307         cli_nt_pipes_close(cli);
 308
 309         /*
 310          * tell our peer to free his resources.  Wihtout this, when an
 311          * application attempts to do a graceful shutdown and calls
 312          * smbc_free_context() to clean up all connections, some connections
 313          * can remain active on the peer end, until some (long) timeout period
 314          * later.  This tree disconnect forces the peer to clean up, since the
 315          * connection will be going away.
 316          */
 317         if (cli_state_has_tcon(cli)) {
 318                 cli_tdis(cli);
 319         }
 320
 321         data_blob_free(&cli->secblob);
 322         data_blob_free(&cli->user_session_key);
 323
 324         if (cli->fd != -1) {
 325                 close(cli->fd);
 326         }
 327         cli->fd = -1;
 328
 329         /*
 330          * Need to free pending first, they remove themselves
 331          */
 332         while (cli->conn.pending) {
 333                 talloc_free(cli->conn.pending[0]);
 334         }
 335         TALLOC_FREE(cli);
 336 }
 337
 338 void cli_shutdown(struct cli_state *cli)
 339 {
 340         struct cli_state *cli_head;
 341         if (cli == NULL) {
 342                 return;
 343         }
 344         DLIST_HEAD(cli, cli_head);
 345         if (cli_head == cli) {
 346                 /*
 347                  * head of a DFS list, shutdown all subsidiary DFS
 348                  * connections.
 349                  */
 350                 struct cli_state *p, *next;
 351
 352                 for (p = cli_head->next; p; p = next) {
 353                         next = p->next;
 354                         DLIST_REMOVE(cli_head, p);
 355                         _cli_shutdown(p);
 356                 }
 357         } else {
 358                 DLIST_REMOVE(cli_head, cli);
 359         }
 360
 361         _cli_shutdown(cli);
 362 }
 363
 364 /****************************************************************************
 365  Set socket options on a open connection.
 366 ****************************************************************************/
 367
 368 void cli_sockopt(struct cli_state *cli, const char *options)
 369 {
 370         set_socket_options(cli->fd, options);
 371 }
 372
 373 uint16_t cli_state_get_vc_num(struct cli_state *cli)
 374 {
 375         return cli->smb1.vc_num;
 376 }
 377
 378 /****************************************************************************
 379  Set the PID to use for smb messages. Return the old pid.
 380 ****************************************************************************/
 381
 382 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 383 {
 384         uint16_t ret = cli->smb1.pid;
 385         cli->smb1.pid = pid;
 386         return ret;
 387 }
 388
 389 uint16_t cli_getpid(struct cli_state *cli)
 390 {
 391         return cli->smb1.pid;
 392 }
 393
 394 bool cli_state_has_tcon(struct cli_state *cli)
 395 {
 396         if (cli->smb1.tid == UINT16_MAX) {
 397                 return false;
 398         }
 399
 400         return true;
 401 }
 402
 403 uint16_t cli_state_get_tid(struct cli_state *cli)
 404 {
 405         return cli->smb1.tid;
 406 }
 407
 408 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid)
 409 {
 410         uint16_t ret = cli->smb1.tid;
 411         cli->smb1.tid = tid;
 412         return ret;
 413 }
 414
 415 uint16_t cli_state_get_uid(struct cli_state *cli)
 416 {
 417         return cli->smb1.uid;
 418 }
 419
 420 uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
 421 {
 422         uint16_t ret = cli->smb1.uid;
 423         cli->smb1.uid = uid;
 424         return ret;
 425 }
 426
 427 /****************************************************************************
 428  Set the case sensitivity flag on the packets. Returns old state.
 429 ****************************************************************************/
 430
 431 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 432 {
 433         bool ret = cli->case_sensitive;
 434         cli->case_sensitive = case_sensitive;
 435         return ret;
 436 }
 437
 438 struct cli_echo_state {
 439         uint16_t vwv[1];
 440         DATA_BLOB data;
 441         int num_echos;
 442 };
 443
 444 static void cli_echo_done(struct tevent_req *subreq);
 445
 446 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
 447                                  struct cli_state *cli, uint16_t num_echos,
 448                                  DATA_BLOB data)
 449 {
 450         struct tevent_req *req, *subreq;
 451         struct cli_echo_state *state;
 452
 453         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 454         if (req == NULL) {
 455                 return NULL;
 456         }
 457         SSVAL(state->vwv, 0, num_echos);
 458         state->data = data;
 459         state->num_echos = num_echos;
 460
 461         subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
 462                               data.length, data.data);
 463         if (subreq == NULL) {
 464                 goto fail;
 465         }
 466         tevent_req_set_callback(subreq, cli_echo_done, req);
 467         return req;
 468  fail:
 469         TALLOC_FREE(req);
 470         return NULL;
 471 }
 472
 473 static void cli_echo_done(struct tevent_req *subreq)
 474 {
 475         struct tevent_req *req = tevent_req_callback_data(
 476                 subreq, struct tevent_req);
 477         struct cli_echo_state *state = tevent_req_data(
 478                 req, struct cli_echo_state);
 479         NTSTATUS status;
 480         uint32_t num_bytes;
 481         uint8_t *bytes;
 482         uint8_t *inbuf;
 483
 484         status = cli_smb_recv(subreq, state, &inbuf, 0, NULL, NULL,
 485                               &num_bytes, &bytes);
 486         if (!NT_STATUS_IS_OK(status)) {
 487                 tevent_req_nterror(req, status);
 488                 return;
 489         }
 490         if ((num_bytes != state->data.length)
 491             || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
 492                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
 493                 return;
 494         }
 495
 496         state->num_echos -=1;
 497         if (state->num_echos == 0) {
 498                 tevent_req_done(req);
 499                 return;
 500         }
 501
 502         if (!cli_smb_req_set_pending(subreq)) {
 503                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 504                 return;
 505         }
 506 }
 507
 508 /**
 509  * Get the result out from an echo request
 510  * @param[in] req       The async_req from cli_echo_send
 511  * @retval Did the server reply correctly?
 512  */
 513
 514 NTSTATUS cli_echo_recv(struct tevent_req *req)
 515 {
 516         return tevent_req_simple_recv_ntstatus(req);
 517 }
 518
 519 /**
 520  * @brief Send/Receive SMBEcho requests
 521  * @param[in] mem_ctx   The memory context to put the async_req on
 522  * @param[in] ev        The event context that will call us back
 523  * @param[in] cli       The connection to send the echo to
 524  * @param[in] num_echos How many times do we want to get the reply?
 525  * @param[in] data      The data we want to get back
 526  * @retval Did the server reply correctly?
 527  */
 528
 529 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 530 {
 531         TALLOC_CTX *frame = talloc_stackframe();
 532         struct event_context *ev;
 533         struct tevent_req *req;
 534         NTSTATUS status = NT_STATUS_OK;
 535
 536         if (cli_has_async_calls(cli)) {
 537                 /*
 538                  * Can't use sync call while an async call is in flight
 539                  */
 540                 status = NT_STATUS_INVALID_PARAMETER;
 541                 goto fail;
 542         }
 543
 544         ev = event_context_init(frame);
 545         if (ev == NULL) {
 546                 status = NT_STATUS_NO_MEMORY;
 547                 goto fail;
 548         }
 549
 550         req = cli_echo_send(frame, ev, cli, num_echos, data);
 551         if (req == NULL) {
 552                 status = NT_STATUS_NO_MEMORY;
 553                 goto fail;
 554         }
 555
 556         if (!tevent_req_poll(req, ev)) {
 557                 status = map_nt_error_from_unix(errno);
 558                 goto fail;
 559         }
 560
 561         status = cli_echo_recv(req);
 562  fail:
 563         TALLOC_FREE(frame);
 564         return status;
 565 }
 566
 567 /**
 568  * Is the SMB command able to hold an AND_X successor
 569  * @param[in] cmd       The SMB command in question
 570  * @retval Can we add a chained request after "cmd"?
 571  */
 572 bool is_andx_req(uint8_t cmd)
 573 {
 574         switch (cmd) {
 575         case SMBtconX:
 576         case SMBlockingX:
 577         case SMBopenX:
 578         case SMBreadX:
 579         case SMBwriteX:
 580         case SMBsesssetupX:
 581         case SMBulogoffX:
 582         case SMBntcreateX:
 583                 return true;
 584                 break;
 585         default:
 586                 break;
 587         }
 588
 589         return false;
 590 }
 591
 592 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 593                  uint8_t smb_command, uint8_t additional_flags,
 594                  uint8_t wct, uint16_t *vwv,
 595                  uint32_t num_bytes, const uint8_t *bytes,
 596                  struct tevent_req **result_parent,
 597                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 598                  uint32_t *pnum_bytes, uint8_t **pbytes)
 599 {
 600         struct tevent_context *ev;
 601         struct tevent_req *req = NULL;
 602         NTSTATUS status = NT_STATUS_NO_MEMORY;
 603
 604         if (cli_has_async_calls(cli)) {
 605                 return NT_STATUS_INVALID_PARAMETER;
 606         }
 607         ev = tevent_context_init(mem_ctx);
 608         if (ev == NULL) {
 609                 goto fail;
 610         }
 611         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 612                            wct, vwv, num_bytes, bytes);
 613         if (req == NULL) {
 614                 goto fail;
 615         }
 616         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 617                 goto fail;
 618         }
 619         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 620                               pnum_bytes, pbytes);
 621 fail:
 622         TALLOC_FREE(ev);
 623         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 624                 *result_parent = req;
 625         }
 626         return status;
 627 }