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 "../libcli/smb/smb_signing.h"
  25 #include "../libcli/smb/smb_seal.h"
  26 #include "async_smb.h"
  27 #include "../libcli/smb/smbXcli_base.h"
  28 #include "../librpc/ndr/libndr.h"
  29 #include "../include/client.h"
  30
  31 /*******************************************************************
  32  Setup the word count and byte count for a client smb message.
  33 ********************************************************************/
  34
  35 int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
  36 {
  37         if (zero && (num_words || num_bytes)) {
  38                 memset(buf + smb_size,'\0',num_words*2 + num_bytes);
  39         }
  40         SCVAL(buf,smb_wct,num_words);
  41         SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
  42         smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
  43         return (smb_size + num_words*2 + num_bytes);
  44 }
  45
  46 /****************************************************************************
  47  Change the timeout (in milliseconds).
  48 ****************************************************************************/
  49
  50 unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
  51 {
  52         unsigned int old_timeout = cli->timeout;
  53         cli->timeout = timeout;
  54         return old_timeout;
  55 }
  56
  57 /****************************************************************************
  58  Set the 'backup_intent' flag.
  59 ****************************************************************************/
  60
  61 bool cli_set_backup_intent(struct cli_state *cli, bool flag)
  62 {
  63         bool old_state = cli->backup_intent;
  64         cli->backup_intent = flag;
  65         return old_state;
  66 }
  67
  68 /****************************************************************************
  69  Initialize Domain, user or password.
  70 ****************************************************************************/
  71
  72 NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
  73 {
  74         TALLOC_FREE(cli->domain);
  75         cli->domain = talloc_strdup(cli, domain ? domain : "");
  76         if (cli->domain == NULL) {
  77                 return NT_STATUS_NO_MEMORY;
  78         }
  79         return NT_STATUS_OK;
  80 }
  81
  82 NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
  83 {
  84         TALLOC_FREE(cli->user_name);
  85         cli->user_name = talloc_strdup(cli, username ? username : "");
  86         if (cli->user_name == NULL) {
  87                 return NT_STATUS_NO_MEMORY;
  88         }
  89         return NT_STATUS_OK;
  90 }
  91
  92 NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
  93 {
  94         TALLOC_FREE(cli->password);
  95
  96         /* Password can be NULL. */
  97         if (password) {
  98                 cli->password = talloc_strdup(cli, password);
  99                 if (cli->password == NULL) {
 100                         return NT_STATUS_NO_MEMORY;
 101                 }
 102         } else {
 103                 /* Use zero NTLMSSP hashes and session key. */
 104                 cli->password = NULL;
 105         }
 106
 107         return NT_STATUS_OK;
 108 }
 109
 110 /****************************************************************************
 111  Initialise credentials of a client structure.
 112 ****************************************************************************/
 113
 114 NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
 115 {
 116         NTSTATUS status = cli_set_username(cli, username);
 117         if (!NT_STATUS_IS_OK(status)) {
 118                 return status;
 119         }
 120         status = cli_set_domain(cli, domain);
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 return status;
 123         }
 124         DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
 125
 126         return cli_set_password(cli, password);
 127 }
 128
 129 /****************************************************************************
 130  Initialise a client structure. Always returns a talloc'ed struct.
 131  Set the signing state (used from the command line).
 132 ****************************************************************************/
 133
 134 struct cli_state *cli_state_create(TALLOC_CTX *mem_ctx,
 135                                    int fd,
 136                                    const char *remote_name,
 137                                    const char *remote_realm,
 138                                    int signing_state, int flags)
 139 {
 140         struct cli_state *cli = NULL;
 141         bool use_spnego = lp_client_use_spnego();
 142         bool force_dos_errors = false;
 143         bool force_ascii = false;
 144         bool use_level_II_oplocks = false;
 145         uint32_t smb1_capabilities = 0;
 146         uint32_t smb2_capabilities = 0;
 147         struct GUID client_guid = GUID_random();
 148
 149         /* Check the effective uid - make sure we are not setuid */
 150         if (is_setuid_root()) {
 151                 DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
 152                 return NULL;
 153         }
 154
 155         cli = talloc_zero(mem_ctx, struct cli_state);
 156         if (!cli) {
 157                 return NULL;
 158         }
 159
 160         cli->server_domain = talloc_strdup(cli, "");
 161         if (!cli->server_domain) {
 162                 goto error;
 163         }
 164         cli->server_os = talloc_strdup(cli, "");
 165         if (!cli->server_os) {
 166                 goto error;
 167         }
 168         cli->server_type = talloc_strdup(cli, "");
 169         if (!cli->server_type) {
 170                 goto error;
 171         }
 172
 173         cli->dfs_mountpoint = talloc_strdup(cli, "");
 174         if (!cli->dfs_mountpoint) {
 175                 goto error;
 176         }
 177         cli->raw_status = NT_STATUS_INTERNAL_ERROR;
 178         cli->map_dos_errors = true; /* remove this */
 179         cli->timeout = CLIENT_TIMEOUT;
 180         cli->case_sensitive = false;
 181
 182         /* Set the CLI_FORCE_DOSERR environment variable to test
 183            client routines using DOS errors instead of STATUS32
 184            ones.  This intended only as a temporary hack. */
 185         if (getenv("CLI_FORCE_DOSERR")) {
 186                 force_dos_errors = true;
 187         }
 188         if (flags & CLI_FULL_CONNECTION_FORCE_DOS_ERRORS) {
 189                 force_dos_errors = true;
 190         }
 191
 192         if (getenv("CLI_FORCE_ASCII")) {
 193                 force_ascii = true;
 194         }
 195         if (!lp_unicode()) {
 196                 force_ascii = true;
 197         }
 198         if (flags & CLI_FULL_CONNECTION_FORCE_ASCII) {
 199                 force_ascii = true;
 200         }
 201
 202         if (flags & CLI_FULL_CONNECTION_DONT_SPNEGO) {
 203                 use_spnego = false;
 204         } else if (flags & CLI_FULL_CONNECTION_USE_KERBEROS) {
 205                 cli->use_kerberos = true;
 206         }
 207         if ((flags & CLI_FULL_CONNECTION_FALLBACK_AFTER_KERBEROS) &&
 208              cli->use_kerberos) {
 209                 cli->fallback_after_kerberos = true;
 210         }
 211
 212         if (flags & CLI_FULL_CONNECTION_USE_CCACHE) {
 213                 cli->use_ccache = true;
 214         }
 215
 216         if (flags & CLI_FULL_CONNECTION_USE_NT_HASH) {
 217                 cli->pw_nt_hash = true;
 218         }
 219
 220         if (flags & CLI_FULL_CONNECTION_OPLOCKS) {
 221                 cli->use_oplocks = true;
 222         }
 223         if (flags & CLI_FULL_CONNECTION_LEVEL_II_OPLOCKS) {
 224                 use_level_II_oplocks = true;
 225         }
 226
 227         if (signing_state == SMB_SIGNING_DEFAULT) {
 228                 signing_state = lp_client_signing();
 229         }
 230
 231         smb1_capabilities = 0;
 232         smb1_capabilities |= CAP_LARGE_FILES;
 233         smb1_capabilities |= CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
 234         smb1_capabilities |= CAP_LOCK_AND_READ | CAP_NT_FIND;
 235         smb1_capabilities |= CAP_DFS | CAP_W2K_SMBS;
 236         smb1_capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX;
 237         smb1_capabilities |= CAP_LWIO;
 238
 239         if (!force_dos_errors) {
 240                 smb1_capabilities |= CAP_STATUS32;
 241         }
 242
 243         if (!force_ascii) {
 244                 smb1_capabilities |= CAP_UNICODE;
 245         }
 246
 247         if (use_spnego) {
 248                 smb1_capabilities |= CAP_EXTENDED_SECURITY;
 249         }
 250
 251         if (use_level_II_oplocks) {
 252                 smb1_capabilities |= CAP_LEVEL_II_OPLOCKS;
 253         }
 254
 255         smb2_capabilities = SMB2_CAP_ALL;
 256
 257         if (remote_realm) {
 258                 cli->remote_realm = talloc_strdup(cli, remote_realm);
 259                 if (cli->remote_realm == NULL) {
 260                         goto error;
 261                 }
 262         }
 263
 264         cli->conn = smbXcli_conn_create(cli, fd, remote_name,
 265                                         signing_state,
 266                                         smb1_capabilities,
 267                                         &client_guid,
 268                                         smb2_capabilities);
 269         if (cli->conn == NULL) {
 270                 goto error;
 271         }
 272
 273         cli->smb1.pid = (uint16_t)getpid();
 274         cli->smb1.vc_num = cli->smb1.pid;
 275         cli->smb1.tcon = smbXcli_tcon_create(cli);
 276         if (cli->smb1.tcon == NULL) {
 277                 goto error;
 278         }
 279         smb1cli_tcon_set_id(cli->smb1.tcon, UINT16_MAX);
 280         cli->smb1.session = smbXcli_session_create(cli, cli->conn);
 281         if (cli->smb1.session == NULL) {
 282                 goto error;
 283         }
 284
 285         cli->initialised = 1;
 286         return cli;
 287
 288         /* Clean up after malloc() error */
 289
 290  error:
 291
 292         TALLOC_FREE(cli);
 293         return NULL;
 294 }
 295
 296 /****************************************************************************
 297  Close all pipes open on this session.
 298 ****************************************************************************/
 299
 300 void cli_nt_pipes_close(struct cli_state *cli)
 301 {
 302         while (cli->pipe_list != NULL) {
 303                 /*
 304                  * No TALLOC_FREE here!
 305                  */
 306                 talloc_free(cli->pipe_list);
 307         }
 308 }
 309
 310 /****************************************************************************
 311  Shutdown a client structure.
 312 ****************************************************************************/
 313
 314 static void _cli_shutdown(struct cli_state *cli)
 315 {
 316         cli_nt_pipes_close(cli);
 317
 318         /*
 319          * tell our peer to free his resources.  Wihtout this, when an
 320          * application attempts to do a graceful shutdown and calls
 321          * smbc_free_context() to clean up all connections, some connections
 322          * can remain active on the peer end, until some (long) timeout period
 323          * later.  This tree disconnect forces the peer to clean up, since the
 324          * connection will be going away.
 325          */
 326         if (cli_state_has_tcon(cli)) {
 327                 cli_tdis(cli);
 328         }
 329
 330         smbXcli_conn_disconnect(cli->conn, NT_STATUS_OK);
 331
 332         TALLOC_FREE(cli);
 333 }
 334
 335 void cli_shutdown(struct cli_state *cli)
 336 {
 337         struct cli_state *cli_head;
 338         if (cli == NULL) {
 339                 return;
 340         }
 341         DLIST_HEAD(cli, cli_head);
 342         if (cli_head == cli) {
 343                 /*
 344                  * head of a DFS list, shutdown all subsidiary DFS
 345                  * connections.
 346                  */
 347                 struct cli_state *p, *next;
 348
 349                 for (p = cli_head->next; p; p = next) {
 350                         next = p->next;
 351                         DLIST_REMOVE(cli_head, p);
 352                         _cli_shutdown(p);
 353                 }
 354         } else {
 355                 DLIST_REMOVE(cli_head, cli);
 356         }
 357
 358         _cli_shutdown(cli);
 359 }
 360
 361 const char *cli_state_remote_realm(struct cli_state *cli)
 362 {
 363         return cli->remote_realm;
 364 }
 365
 366 uint16_t cli_state_get_vc_num(struct cli_state *cli)
 367 {
 368         return cli->smb1.vc_num;
 369 }
 370
 371 /****************************************************************************
 372  Set the PID to use for smb messages. Return the old pid.
 373 ****************************************************************************/
 374
 375 uint16 cli_setpid(struct cli_state *cli, uint16 pid)
 376 {
 377         uint16_t ret = cli->smb1.pid;
 378         cli->smb1.pid = pid;
 379         return ret;
 380 }
 381
 382 uint16_t cli_getpid(struct cli_state *cli)
 383 {
 384         return cli->smb1.pid;
 385 }
 386
 387 bool cli_state_has_tcon(struct cli_state *cli)
 388 {
 389         uint16_t tid = cli_state_get_tid(cli);
 390
 391         if (tid == UINT16_MAX) {
 392                 return false;
 393         }
 394
 395         return true;
 396 }
 397
 398 uint16_t cli_state_get_tid(struct cli_state *cli)
 399 {
 400         return smb1cli_tcon_current_id(cli->smb1.tcon);
 401 }
 402
 403 uint16_t cli_state_set_tid(struct cli_state *cli, uint16_t tid)
 404 {
 405         uint16_t ret = smb1cli_tcon_current_id(cli->smb1.tcon);
 406         smb1cli_tcon_set_id(cli->smb1.tcon, tid);
 407         return ret;
 408 }
 409
 410 uint16_t cli_state_get_uid(struct cli_state *cli)
 411 {
 412         return smb1cli_session_current_id(cli->smb1.session);
 413 }
 414
 415 uint16_t cli_state_set_uid(struct cli_state *cli, uint16_t uid)
 416 {
 417         uint16_t ret = smb1cli_session_current_id(cli->smb1.session);
 418         smb1cli_session_set_id(cli->smb1.session, uid);
 419         return ret;
 420 }
 421
 422 /****************************************************************************
 423  Set the case sensitivity flag on the packets. Returns old state.
 424 ****************************************************************************/
 425
 426 bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
 427 {
 428         bool ret = cli->case_sensitive;
 429         cli->case_sensitive = case_sensitive;
 430         return ret;
 431 }
 432
 433 uint32_t cli_state_available_size(struct cli_state *cli, uint32_t ofs)
 434 {
 435         uint32_t ret = smb1cli_conn_max_xmit(cli->conn);
 436
 437         if (ofs >= ret) {
 438                 return 0;
 439         }
 440
 441         ret -= ofs;
 442
 443         return ret;
 444 }
 445
 446 time_t cli_state_server_time(struct cli_state *cli)
 447 {
 448         NTTIME nt;
 449         time_t t;
 450
 451         nt = smbXcli_conn_server_system_time(cli->conn);
 452         t = nt_time_to_unix(nt);
 453
 454         return t;
 455 }
 456
 457 struct cli_echo_state {
 458         bool is_smb2;
 459 };
 460
 461 static void cli_echo_done(struct tevent_req *subreq);
 462
 463 struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 464                                  struct cli_state *cli, uint16_t num_echos,
 465                                  DATA_BLOB data)
 466 {
 467         struct tevent_req *req, *subreq;
 468         struct cli_echo_state *state;
 469
 470         req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
 471         if (req == NULL) {
 472                 return NULL;
 473         }
 474
 475         if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
 476                 state->is_smb2 = true;
 477                 subreq = smb2cli_echo_send(state, ev,
 478                                            cli->conn,
 479                                            cli->timeout);
 480         } else {
 481                 subreq = smb1cli_echo_send(state, ev,
 482                                            cli->conn,
 483                                            cli->timeout,
 484                                            num_echos,
 485                                            data);
 486         }
 487         if (tevent_req_nomem(subreq, req)) {
 488                 return tevent_req_post(req, ev);
 489         }
 490         tevent_req_set_callback(subreq, cli_echo_done, req);
 491
 492         return req;
 493 }
 494
 495 static void cli_echo_done(struct tevent_req *subreq)
 496 {
 497         struct tevent_req *req = tevent_req_callback_data(
 498                 subreq, struct tevent_req);
 499         struct cli_echo_state *state = tevent_req_data(
 500                 req, struct cli_echo_state);
 501         NTSTATUS status;
 502
 503         if (state->is_smb2) {
 504                 status = smb2cli_echo_recv(subreq);
 505         } else {
 506                 status = smb1cli_echo_recv(subreq);
 507         }
 508         TALLOC_FREE(subreq);
 509         if (!NT_STATUS_IS_OK(status)) {
 510                 tevent_req_nterror(req, status);
 511                 return;
 512         }
 513
 514         tevent_req_done(req);
 515 }
 516
 517 /**
 518  * Get the result out from an echo request
 519  * @param[in] req       The async_req from cli_echo_send
 520  * @retval Did the server reply correctly?
 521  */
 522
 523 NTSTATUS cli_echo_recv(struct tevent_req *req)
 524 {
 525         return tevent_req_simple_recv_ntstatus(req);
 526 }
 527
 528 /**
 529  * @brief Send/Receive SMBEcho requests
 530  * @param[in] mem_ctx   The memory context to put the async_req on
 531  * @param[in] ev        The event context that will call us back
 532  * @param[in] cli       The connection to send the echo to
 533  * @param[in] num_echos How many times do we want to get the reply?
 534  * @param[in] data      The data we want to get back
 535  * @retval Did the server reply correctly?
 536  */
 537
 538 NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
 539 {
 540         TALLOC_CTX *frame = talloc_stackframe();
 541         struct tevent_context *ev;
 542         struct tevent_req *req;
 543         NTSTATUS status = NT_STATUS_OK;
 544
 545         if (smbXcli_conn_has_async_calls(cli->conn)) {
 546                 /*
 547                  * Can't use sync call while an async call is in flight
 548                  */
 549                 status = NT_STATUS_INVALID_PARAMETER;
 550                 goto fail;
 551         }
 552
 553         ev = samba_tevent_context_init(frame);
 554         if (ev == NULL) {
 555                 status = NT_STATUS_NO_MEMORY;
 556                 goto fail;
 557         }
 558
 559         req = cli_echo_send(frame, ev, cli, num_echos, data);
 560         if (req == NULL) {
 561                 status = NT_STATUS_NO_MEMORY;
 562                 goto fail;
 563         }
 564
 565         if (!tevent_req_poll(req, ev)) {
 566                 status = map_nt_error_from_unix(errno);
 567                 goto fail;
 568         }
 569
 570         status = cli_echo_recv(req);
 571  fail:
 572         TALLOC_FREE(frame);
 573         return status;
 574 }
 575
 576 /**
 577  * Is the SMB command able to hold an AND_X successor
 578  * @param[in] cmd       The SMB command in question
 579  * @retval Can we add a chained request after "cmd"?
 580  */
 581 bool is_andx_req(uint8_t cmd)
 582 {
 583         switch (cmd) {
 584         case SMBtconX:
 585         case SMBlockingX:
 586         case SMBopenX:
 587         case SMBreadX:
 588         case SMBwriteX:
 589         case SMBsesssetupX:
 590         case SMBulogoffX:
 591         case SMBntcreateX:
 592                 return true;
 593                 break;
 594         default:
 595                 break;
 596         }
 597
 598         return false;
 599 }
 600
 601 NTSTATUS cli_smb(TALLOC_CTX *mem_ctx, struct cli_state *cli,
 602                  uint8_t smb_command, uint8_t additional_flags,
 603                  uint8_t wct, uint16_t *vwv,
 604                  uint32_t num_bytes, const uint8_t *bytes,
 605                  struct tevent_req **result_parent,
 606                  uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 607                  uint32_t *pnum_bytes, uint8_t **pbytes)
 608 {
 609         struct tevent_context *ev;
 610         struct tevent_req *req = NULL;
 611         NTSTATUS status = NT_STATUS_NO_MEMORY;
 612
 613         if (smbXcli_conn_has_async_calls(cli->conn)) {
 614                 return NT_STATUS_INVALID_PARAMETER;
 615         }
 616         ev = samba_tevent_context_init(mem_ctx);
 617         if (ev == NULL) {
 618                 goto fail;
 619         }
 620         req = cli_smb_send(mem_ctx, ev, cli, smb_command, additional_flags,
 621                            wct, vwv, num_bytes, bytes);
 622         if (req == NULL) {
 623                 goto fail;
 624         }
 625         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 626                 goto fail;
 627         }
 628         status = cli_smb_recv(req, NULL, NULL, min_wct, pwct, pvwv,
 629                               pnum_bytes, pbytes);
 630 fail:
 631         TALLOC_FREE(ev);
 632         if (NT_STATUS_IS_OK(status) && (result_parent != NULL)) {
 633                 *result_parent = req;
 634         }
 635         return status;
 636 }