source4/libcli/raw/clitransport.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB client transport context management functions
   4
   5    Copyright (C) Andrew Tridgell 1994-2005
   6    Copyright (C) James Myers 2003 <myersjj@samba.org>
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "system/network.h"
  24 #include "../lib/async_req/async_sock.h"
  25 #include "../lib/util/tevent_ntstatus.h"
  26 #include "libcli/raw/libcliraw.h"
  27 #include "libcli/raw/raw_proto.h"
  28 #include "lib/socket/socket.h"
  29 #include "lib/events/events.h"
  30 #include "librpc/gen_ndr/ndr_nbt.h"
  31 #include "../libcli/nbt/libnbt.h"
  32 #include "../libcli/smb/smbXcli_base.h"
  33 #include "../libcli/smb/read_smb.h"
  34
  35 /*
  36   destroy a transport
  37  */
  38 static int transport_destructor(struct smbcli_transport *transport)
  39 {
  40         smbcli_transport_dead(transport, NT_STATUS_LOCAL_DISCONNECT);
  41         return 0;
  42 }
  43
  44 /*
  45   create a transport structure based on an established socket
  46 */
  47 struct smbcli_transport *smbcli_transport_init(struct smbcli_socket *sock,
  48                                                TALLOC_CTX *parent_ctx,
  49                                                bool primary,
  50                                                struct smbcli_options *options)
  51 {
  52         struct smbcli_transport *transport;
  53         uint32_t smb1_capabilities;
  54
  55         transport = talloc_zero(parent_ctx, struct smbcli_transport);
  56         if (!transport) return NULL;
  57
  58         transport->ev = sock->event.ctx;
  59         transport->options = *options;
  60
  61         if (transport->options.max_protocol == PROTOCOL_DEFAULT) {
  62                 transport->options.max_protocol = PROTOCOL_NT1;
  63         }
  64
  65         if (transport->options.max_protocol > PROTOCOL_NT1) {
  66                 transport->options.max_protocol = PROTOCOL_NT1;
  67         }
  68
  69         TALLOC_FREE(sock->event.fde);
  70         TALLOC_FREE(sock->event.te);
  71
  72         smb1_capabilities = 0;
  73         smb1_capabilities |= CAP_LARGE_FILES;
  74         smb1_capabilities |= CAP_NT_SMBS | CAP_RPC_REMOTE_APIS;
  75         smb1_capabilities |= CAP_LOCK_AND_READ | CAP_NT_FIND;
  76         smb1_capabilities |= CAP_DFS | CAP_W2K_SMBS;
  77         smb1_capabilities |= CAP_LARGE_READX|CAP_LARGE_WRITEX;
  78         smb1_capabilities |= CAP_LWIO;
  79
  80         if (options->ntstatus_support) {
  81                 smb1_capabilities |= CAP_STATUS32;
  82         }
  83
  84         if (options->unicode) {
  85                 smb1_capabilities |= CAP_UNICODE;
  86         }
  87
  88         if (options->use_spnego) {
  89                 smb1_capabilities |= CAP_EXTENDED_SECURITY;
  90         }
  91
  92         if (options->use_level2_oplocks) {
  93                 smb1_capabilities |= CAP_LEVEL_II_OPLOCKS;
  94         }
  95
  96         transport->conn = smbXcli_conn_create(transport,
  97                                               sock->sock->fd,
  98                                               sock->hostname,
  99                                               options->signing,
 100                                               smb1_capabilities,
 101                                               NULL, /* client_guid */
 102                                               0, /* smb2_capabilities */
 103                                               NULL); /* smb3_ciphers */
 104         if (transport->conn == NULL) {
 105                 TALLOC_FREE(sock);
 106                 TALLOC_FREE(transport);
 107                 return NULL;
 108         }
 109         sock->sock->fd = -1;
 110         TALLOC_FREE(sock);
 111
 112         talloc_set_destructor(transport, transport_destructor);
 113
 114         return transport;
 115 }
 116
 117 /*
 118   create a transport structure based on an established socket
 119 */
 120 NTSTATUS smbcli_transport_raw_init(TALLOC_CTX *mem_ctx,
 121                                    struct tevent_context *ev,
 122                                    struct smbXcli_conn **_conn,
 123                                    const struct smbcli_options *options,
 124                                    struct smbcli_transport **_transport)
 125 {
 126         struct smbcli_transport *transport = NULL;
 127         NTSTATUS status;
 128
 129         if (*_conn == NULL) {
 130                 return NT_STATUS_INVALID_PARAMETER;
 131         }
 132
 133         transport = talloc_zero(mem_ctx, struct smbcli_transport);
 134         if (transport == NULL) {
 135                 return NT_STATUS_NO_MEMORY;
 136         }
 137
 138         transport->ev = ev;
 139         transport->options = *options;
 140
 141         /*
 142          * First only set the pointer without move.
 143          */
 144         transport->conn = *_conn;
 145         status = smb_raw_negotiate_fill_transport(transport);
 146         if (!NT_STATUS_IS_OK(status)) {
 147                 TALLOC_FREE(transport);
 148                 return status;
 149         }
 150
 151         talloc_set_destructor(transport, transport_destructor);
 152
 153         /*
 154          * Now move it away from the caller...
 155          */
 156         transport->conn = talloc_move(transport, _conn);
 157         *_transport = transport;
 158         return NT_STATUS_OK;
 159 }
 160
 161 /*
 162   mark the transport as dead
 163 */
 164 void smbcli_transport_dead(struct smbcli_transport *transport, NTSTATUS status)
 165 {
 166         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
 167                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
 168         }
 169         if (NT_STATUS_IS_OK(status)) {
 170                 status = NT_STATUS_LOCAL_DISCONNECT;
 171         }
 172
 173         smbXcli_conn_disconnect(transport->conn, status);
 174 }
 175
 176 static void idle_handler(struct tevent_context *ev,
 177                          struct tevent_timer *te, struct timeval t, void *private_data)
 178 {
 179         struct smbcli_transport *transport = talloc_get_type(private_data,
 180                                                              struct smbcli_transport);
 181         struct timeval next;
 182
 183         transport->idle.func(transport, transport->idle.private_data);
 184
 185         if (transport->idle.func == NULL) {
 186                 return;
 187         }
 188
 189         if (!smbXcli_conn_is_connected(transport->conn)) {
 190                 return;
 191         }
 192
 193         next = timeval_current_ofs_usec(transport->idle.period);
 194
 195         transport->idle.te = tevent_add_timer(transport->ev,
 196                                               transport,
 197                                               next,
 198                                               idle_handler,
 199                                               transport);
 200 }
 201
 202 /*
 203   setup the idle handler for a transport
 204   the period is in microseconds
 205 */
 206 _PUBLIC_ void smbcli_transport_idle_handler(struct smbcli_transport *transport,
 207                                    void (*idle_func)(struct smbcli_transport *, void *),
 208                                    uint64_t period,
 209                                    void *private_data)
 210 {
 211         TALLOC_FREE(transport->idle.te);
 212         ZERO_STRUCT(transport->idle);
 213
 214         if (idle_func == NULL) {
 215                 return;
 216         }
 217
 218         if (!smbXcli_conn_is_connected(transport->conn)) {
 219                 return;
 220         }
 221
 222         transport->idle.func = idle_func;
 223         transport->idle.private_data = private_data;
 224         transport->idle.period = period;
 225
 226         transport->idle.te = tevent_add_timer(transport->ev,
 227                                               transport,
 228                                               timeval_current_ofs_usec(period),
 229                                               idle_handler,
 230                                               transport);
 231 }
 232
 233 /*
 234   process some read/write requests that are pending
 235   return false if the socket is dead
 236 */
 237 _PUBLIC_ bool smbcli_transport_process(struct smbcli_transport *transport)
 238 {
 239         struct tevent_req *subreq = NULL;
 240         int ret;
 241
 242         if (!smbXcli_conn_is_connected(transport->conn)) {
 243                 return false;
 244         }
 245
 246         if (!smbXcli_conn_has_async_calls(transport->conn)) {
 247                 return true;
 248         }
 249
 250         /*
 251          * do not block for more than 500 micro seconds
 252          */
 253         subreq = tevent_wakeup_send(transport,
 254                                     transport->ev,
 255                                     timeval_current_ofs_usec(500));
 256         if (subreq == NULL) {
 257                 return false;
 258         }
 259
 260         ret = tevent_loop_once(transport->ev);
 261         if (ret != 0) {
 262                 return false;
 263         }
 264
 265         TALLOC_FREE(subreq);
 266
 267         if (!smbXcli_conn_is_connected(transport->conn)) {
 268                 return false;
 269         }
 270
 271         return true;
 272 }
 273
 274 static void smbcli_transport_break_handler(struct tevent_req *subreq);
 275 static void smbcli_request_done(struct tevent_req *subreq);
 276
 277 struct tevent_req *smbcli_transport_setup_subreq(struct smbcli_request *req)
 278 {
 279         struct smbcli_transport *transport = req->transport;
 280         uint8_t smb_command;
 281         uint8_t additional_flags;
 282         uint8_t clear_flags;
 283         uint16_t additional_flags2;
 284         uint16_t clear_flags2;
 285         uint32_t pid;
 286         struct smbXcli_tcon *tcon = NULL;
 287         struct smbXcli_session *session = NULL;
 288         uint32_t timeout_msec = transport->options.request_timeout * 1000;
 289         struct iovec *bytes_iov = NULL;
 290         struct tevent_req *subreq = NULL;
 291
 292         smb_command = SVAL(req->out.hdr, HDR_COM);
 293         additional_flags = CVAL(req->out.hdr, HDR_FLG);
 294         additional_flags2 = SVAL(req->out.hdr, HDR_FLG2);
 295         pid  = SVAL(req->out.hdr, HDR_PID);
 296         pid |= SVAL(req->out.hdr, HDR_PIDHIGH)<<16;
 297
 298         clear_flags = ~additional_flags;
 299         clear_flags2 = ~additional_flags2;
 300
 301         if (req->session) {
 302                 session = req->session->smbXcli;
 303         }
 304
 305         if (req->tree) {
 306                 tcon = req->tree->smbXcli;
 307         }
 308
 309         bytes_iov = talloc(req, struct iovec);
 310         if (bytes_iov == NULL) {
 311                 return NULL;
 312         }
 313         bytes_iov->iov_base = (void *)req->out.data;
 314         bytes_iov->iov_len = req->out.data_size;
 315
 316         subreq = smb1cli_req_create(req,
 317                                     transport->ev,
 318                                     transport->conn,
 319                                     smb_command,
 320                                     additional_flags,
 321                                     clear_flags,
 322                                     additional_flags2,
 323                                     clear_flags2,
 324                                     timeout_msec,
 325                                     pid,
 326                                     tcon,
 327                                     session,
 328                                     req->out.wct,
 329                                     (uint16_t *)req->out.vwv,
 330                                     1, bytes_iov);
 331         if (subreq == NULL) {
 332                 return NULL;
 333         }
 334
 335         ZERO_STRUCT(req->out);
 336
 337         return subreq;
 338 }
 339
 340 /*
 341   put a request into the send queue
 342 */
 343 void smbcli_transport_send(struct smbcli_request *req)
 344 {
 345         struct smbcli_transport *transport = req->transport;
 346         NTSTATUS status;
 347         bool need_pending_break = false;
 348         struct tevent_req *subreq = NULL;
 349         size_t i;
 350         size_t num_subreqs = 0;
 351
 352         if (transport->oplock.handler) {
 353                 need_pending_break = true;
 354         }
 355
 356         if (transport->break_subreq) {
 357                 need_pending_break = false;
 358         }
 359
 360         if (need_pending_break) {
 361                 subreq = smb1cli_req_create(transport,
 362                                             transport->ev,
 363                                             transport->conn,
 364                                             0, /* smb_command */
 365                                             0, /* additional_flags */
 366                                             0, /* clear_flags */
 367                                             0, /* additional_flags2 */
 368                                             0, /* clear_flags2 */
 369                                             0, /* timeout_msec */
 370                                             0, /* pid */
 371                                             NULL, /* tcon */
 372                                             NULL, /* session */
 373                                             0, /* wct */
 374                                             NULL, /* vwv */
 375                                             0, /* iov_count */
 376                                             NULL); /* bytes_iov */
 377                 if (subreq != NULL) {
 378                         smb1cli_req_set_mid(subreq, 0xFFFF);
 379                         smbXcli_req_set_pending(subreq);
 380                         tevent_req_set_callback(subreq,
 381                                                 smbcli_transport_break_handler,
 382                                                 transport);
 383                         transport->break_subreq = subreq;
 384                         subreq = NULL;
 385                 }
 386         }
 387
 388         subreq = smbcli_transport_setup_subreq(req);
 389         if (subreq == NULL) {
 390                 req->state = SMBCLI_REQUEST_ERROR;
 391                 req->status = NT_STATUS_NO_MEMORY;
 392                 return;
 393         }
 394
 395         for (i = 0; i < ARRAY_SIZE(req->subreqs); i++) {
 396                 if (req->subreqs[i] == NULL) {
 397                         req->subreqs[i] = subreq;
 398                         subreq = NULL;
 399                 }
 400                 if (req->subreqs[i] == NULL) {
 401                         break;
 402                 }
 403
 404                 if (!tevent_req_is_in_progress(req->subreqs[i])) {
 405                         req->state = SMBCLI_REQUEST_ERROR;
 406                         req->status = NT_STATUS_INTERNAL_ERROR;
 407                         return;
 408                 }
 409         }
 410         num_subreqs = i;
 411
 412         req->state = SMBCLI_REQUEST_RECV;
 413         tevent_req_set_callback(req->subreqs[0], smbcli_request_done, req);
 414
 415         status = smb1cli_req_chain_submit(req->subreqs, num_subreqs);
 416         if (!NT_STATUS_IS_OK(status)) {
 417                 req->status = status;
 418                 req->state = SMBCLI_REQUEST_ERROR;
 419                 smbXcli_conn_disconnect(transport->conn, status);
 420         }
 421 }
 422
 423 static void smbcli_request_done(struct tevent_req *subreq)
 424 {
 425         struct smbcli_request *req =
 426                 tevent_req_callback_data(subreq,
 427                 struct smbcli_request);
 428         struct smbcli_transport *transport = req->transport;
 429         ssize_t len;
 430         size_t i;
 431         uint8_t *hdr = NULL;
 432         uint8_t wct = 0;
 433         uint16_t *vwv = NULL;
 434         uint32_t num_bytes = 0;
 435         uint8_t *bytes = NULL;
 436         struct iovec *recv_iov = NULL;
 437         uint8_t *inbuf = NULL;
 438
 439         req->status = smb1cli_req_recv(req->subreqs[0], req,
 440                                        &recv_iov,
 441                                        &hdr,
 442                                        &wct,
 443                                        &vwv,
 444                                        NULL, /* pvwv_offset */
 445                                        &num_bytes,
 446                                        &bytes,
 447                                        NULL, /* pbytes_offset */
 448                                        &inbuf,
 449                                        NULL, 0); /* expected */
 450         TALLOC_FREE(req->subreqs[0]);
 451         if (!NT_STATUS_IS_OK(req->status)) {
 452                 if (recv_iov == NULL) {
 453                         req->state = SMBCLI_REQUEST_ERROR;
 454                         transport->error.e.nt_status = req->status;
 455                         transport->error.etype = ETYPE_SOCKET;
 456                         if (req->async.fn) {
 457                                 req->async.fn(req);
 458                         }
 459                         return;
 460                 }
 461         }
 462
 463         /*
 464          * For SMBreadBraw hdr is NULL
 465          */
 466         len = recv_iov[0].iov_len;
 467         for (i=1; hdr != NULL && i < 3; i++) {
 468                 uint8_t *p = recv_iov[i-1].iov_base;
 469                 uint8_t *c1 = recv_iov[i].iov_base;
 470                 uint8_t *c2 = p + recv_iov[i-1].iov_len;
 471
 472                 len += recv_iov[i].iov_len;
 473
 474                 c2 += i;
 475                 len += i;
 476
 477                 if (recv_iov[i].iov_len == 0) {
 478                         continue;
 479                 }
 480
 481                 if (c1 != c2) {
 482                         req->state = SMBCLI_REQUEST_ERROR;
 483                         req->status = NT_STATUS_INTERNAL_ERROR;
 484                         transport->error.e.nt_status = req->status;
 485                         transport->error.etype = ETYPE_SMB;
 486                         if (req->async.fn) {
 487                                 req->async.fn(req);
 488                         }
 489                         return;
 490                 }
 491         }
 492
 493         /* fill in the 'in' portion of the matching request */
 494         req->in.buffer = inbuf;
 495         req->in.size = NBT_HDR_SIZE + len;
 496         req->in.allocated = req->in.size;
 497
 498         req->in.hdr = hdr;
 499         req->in.vwv = (uint8_t *)vwv;
 500         req->in.wct = wct;
 501         req->in.data = bytes;
 502         req->in.data_size = num_bytes;
 503         req->in.ptr = req->in.data;
 504         if (hdr != NULL) {
 505                 req->flags2 = SVAL(req->in.hdr, HDR_FLG2);
 506         }
 507
 508         smb_setup_bufinfo(req);
 509
 510         transport->error.e.nt_status = req->status;
 511         if (NT_STATUS_IS_OK(req->status)) {
 512                 transport->error.etype = ETYPE_NONE;
 513         } else {
 514                 transport->error.etype = ETYPE_SMB;
 515         }
 516
 517         req->state = SMBCLI_REQUEST_DONE;
 518         if (req->async.fn) {
 519                 req->async.fn(req);
 520         }
 521 }
 522
 523 static void smbcli_transport_break_handler(struct tevent_req *subreq)
 524 {
 525         struct smbcli_transport *transport =
 526                 tevent_req_callback_data(subreq,
 527                 struct smbcli_transport);
 528         NTSTATUS status;
 529         struct iovec *recv_iov = NULL;
 530         uint8_t *hdr = NULL;
 531         uint16_t *vwv = NULL;
 532         const struct smb1cli_req_expected_response expected[] = {
 533         {
 534                 .status = NT_STATUS_OK,
 535                 .wct = 8,
 536         }
 537         };
 538         uint16_t tid;
 539         uint16_t fnum;
 540         uint8_t level;
 541
 542         transport->break_subreq = NULL;
 543
 544         status = smb1cli_req_recv(subreq, transport,
 545                                   &recv_iov,
 546                                   &hdr,
 547                                   NULL, /* pwct */
 548                                   &vwv,
 549                                   NULL, /* pvwv_offset */
 550                                   NULL, /* pnum_bytes */
 551                                   NULL, /* pbytes */
 552                                   NULL, /* pbytes_offset */
 553                                   NULL, /* pinbuf */
 554                                   expected,
 555                                   ARRAY_SIZE(expected));
 556         TALLOC_FREE(subreq);
 557         if (!NT_STATUS_IS_OK(status)) {
 558                 TALLOC_FREE(recv_iov);
 559                 smbcli_transport_dead(transport, status);
 560                 return;
 561         }
 562
 563         /*
 564          * Setup the subreq to handle the
 565          * next incoming SMB2 Break.
 566          */
 567         subreq = smb1cli_req_create(transport,
 568                                     transport->ev,
 569                                     transport->conn,
 570                                     0, /* smb_command */
 571                                     0, /* additional_flags */
 572                                     0, /* clear_flags */
 573                                     0, /* additional_flags2 */
 574                                     0, /* clear_flags2 */
 575                                     0, /* timeout_msec */
 576                                     0, /* pid */
 577                                     NULL, /* tcon */
 578                                     NULL, /* session */
 579                                     0, /* wct */
 580                                     NULL, /* vwv */
 581                                     0, /* iov_count */
 582                                     NULL); /* bytes_iov */
 583         if (subreq != NULL) {
 584                 smb1cli_req_set_mid(subreq, 0xFFFF);
 585                 smbXcli_req_set_pending(subreq);
 586                 tevent_req_set_callback(subreq,
 587                                         smbcli_transport_break_handler,
 588                                         transport);
 589                 transport->break_subreq = subreq;
 590         }
 591
 592         tid = SVAL(hdr, HDR_TID);
 593         fnum = SVAL(vwv+2, 0);
 594         level = CVAL(vwv+3, 1);
 595
 596         TALLOC_FREE(recv_iov);
 597
 598         if (transport->oplock.handler) {
 599                 transport->oplock.handler(transport, tid, fnum, level,
 600                                           transport->oplock.private_data);
 601         } else {
 602                 DEBUG(5,("Got SMB oplock break with no handler\n"));
 603         }
 604
 605 }
 606
 607
 608 /****************************************************************************
 609  Send an SMBecho (async send)
 610 *****************************************************************************/
 611 _PUBLIC_ struct smbcli_request *smb_raw_echo_send(struct smbcli_transport *transport,
 612                                          struct smb_echo *p)
 613 {
 614         struct smbcli_request *req;
 615
 616         req = smbcli_request_setup_transport(transport, SMBecho, 1, p->in.size);
 617         if (!req) return NULL;
 618
 619         SSVAL(req->out.vwv, VWV(0), p->in.repeat_count);
 620
 621         memcpy(req->out.data, p->in.data, p->in.size);
 622
 623         ZERO_STRUCT(p->out);
 624
 625         if (!smbcli_request_send(req)) {
 626                 smbcli_request_destroy(req);
 627                 return NULL;
 628         }
 629
 630         return req;
 631 }
 632
 633 /****************************************************************************
 634  raw echo interface (async recv)
 635 ****************************************************************************/
 636 NTSTATUS smb_raw_echo_recv(struct smbcli_request *req, TALLOC_CTX *mem_ctx,
 637                            struct smb_echo *p)
 638 {
 639         if (!smbcli_request_receive(req) ||
 640             smbcli_request_is_error(req)) {
 641                 goto failed;
 642         }
 643
 644         SMBCLI_CHECK_WCT(req, 1);
 645         p->out.count++;
 646         p->out.sequence_number = SVAL(req->in.vwv, VWV(0));
 647         p->out.size = req->in.data_size;
 648         talloc_free(p->out.data);
 649         p->out.data = talloc_array(mem_ctx, uint8_t, p->out.size);
 650         NT_STATUS_HAVE_NO_MEMORY(p->out.data);
 651
 652         if (!smbcli_raw_pull_data(&req->in.bufinfo, req->in.data, p->out.size, p->out.data)) {
 653                 req->status = NT_STATUS_BUFFER_TOO_SMALL;
 654         }
 655
 656         if (p->out.count == p->in.repeat_count) {
 657                 return smbcli_request_destroy(req);
 658         }
 659
 660         return NT_STATUS_OK;
 661
 662 failed:
 663         return smbcli_request_destroy(req);
 664 }
 665
 666 /****************************************************************************
 667  Send a echo (sync interface)
 668 *****************************************************************************/
 669 NTSTATUS smb_raw_echo(struct smbcli_transport *transport, struct smb_echo *p)
 670 {
 671         struct smbcli_request *req = smb_raw_echo_send(transport, p);
 672         return smbcli_request_simple_recv(req);
 673 }