source4/libcli/smb2/transport.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    SMB2 client transport context management functions
   5
   6    Copyright (C) Andrew Tridgell 2005
   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 "libcli/raw/libcliraw.h"
  25 #include "libcli/raw/raw_proto.h"
  26 #include "libcli/smb2/smb2.h"
  27 #include "libcli/smb2/smb2_calls.h"
  28 #include "lib/socket/socket.h"
  29 #include "lib/events/events.h"
  30 #include "lib/stream/packet.h"
  31 #include "../lib/util/dlinklist.h"
  32 #include "../libcli/smb/smbXcli_base.h"
  33 #include "librpc/ndr/libndr.h"
  34
  35 /*
  36   destroy a transport
  37  */
  38 static int transport_destructor(struct smb2_transport *transport)
  39 {
  40         smb2_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 smb2_transport *smb2_transport_init(struct smbcli_socket *sock,
  48                                            TALLOC_CTX *parent_ctx,
  49                                            struct smbcli_options *options)
  50 {
  51         struct smb2_transport *transport;
  52         struct GUID client_guid;
  53
  54         transport = talloc_zero(parent_ctx, struct smb2_transport);
  55         if (!transport) return NULL;
  56
  57         transport->ev = sock->event.ctx;
  58         transport->options = *options;
  59
  60         TALLOC_FREE(sock->event.fde);
  61         TALLOC_FREE(sock->event.te);
  62
  63         client_guid = GUID_random();
  64
  65         transport->conn = smbXcli_conn_create(transport,
  66                                               sock->sock->fd,
  67                                               sock->hostname,
  68                                               options->signing,
  69                                               0, /* smb1_capabilities */
  70                                               &client_guid);
  71         if (transport->conn == NULL) {
  72                 talloc_free(transport);
  73                 return NULL;
  74         }
  75         sock->sock->fd = -1;
  76         TALLOC_FREE(sock);
  77
  78         talloc_set_destructor(transport, transport_destructor);
  79
  80         return transport;
  81 }
  82
  83 /*
  84   mark the transport as dead
  85 */
  86 void smb2_transport_dead(struct smb2_transport *transport, NTSTATUS status)
  87 {
  88         if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
  89                 status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
  90         }
  91         if (NT_STATUS_IS_OK(status)) {
  92                 status = NT_STATUS_LOCAL_DISCONNECT;
  93         }
  94
  95         smbXcli_conn_disconnect(transport->conn, status);
  96 }
  97
  98 static void smb2_request_done(struct tevent_req *subreq);
  99 static void smb2_transport_break_handler(struct tevent_req *subreq);
 100
 101 /*
 102   put a request into the send queue
 103 */
 104 void smb2_transport_send(struct smb2_request *req)
 105 {
 106         NTSTATUS status;
 107         struct smb2_transport *transport = req->transport;
 108         struct tevent_req **reqs = transport->compound.reqs;
 109         size_t num_reqs = talloc_array_length(reqs);
 110         size_t i;
 111         uint16_t cmd = SVAL(req->out.hdr, SMB2_HDR_OPCODE);
 112         uint32_t additional_flags = IVAL(req->out.hdr, SMB2_HDR_FLAGS);
 113         uint32_t clear_flags = 0;
 114         uint32_t pid = IVAL(req->out.hdr, SMB2_HDR_PID);
 115         uint32_t tid = IVAL(req->out.hdr, SMB2_HDR_TID);
 116         struct smbXcli_session *session = NULL;
 117         bool need_pending_break = false;
 118         size_t hdr_ofs;
 119         size_t pdu_len;
 120         DATA_BLOB body = data_blob_null;
 121         DATA_BLOB dyn = data_blob_null;
 122         uint32_t timeout_msec = transport->options.request_timeout * 1000;
 123
 124         if (transport->oplock.handler) {
 125                 need_pending_break = true;
 126         }
 127
 128         if (transport->lease.handler) {
 129                 need_pending_break = true;
 130         }
 131
 132         if (transport->break_subreq) {
 133                 need_pending_break = false;
 134         }
 135
 136         if (need_pending_break) {
 137                 struct tevent_req *subreq;
 138
 139                 subreq = smb2cli_req_create(transport,
 140                                             transport->ev,
 141                                             transport->conn,
 142                                             SMB2_OP_BREAK,
 143                                             0, /* additional_flags */
 144                                             0, /*clear_flags */
 145                                             0, /* timeout_msec */
 146                                             0, /* pid */
 147                                             0, /* tid */
 148                                             NULL, /* session */
 149                                             NULL, /* body */
 150                                             0, /* body_fixed */
 151                                             NULL, /* dyn */
 152                                             0); /* dyn_len */
 153                 if (subreq != NULL) {
 154                         smbXcli_req_set_pending(subreq);
 155                         tevent_req_set_callback(subreq,
 156                                                 smb2_transport_break_handler,
 157                                                 transport);
 158                         transport->break_subreq = subreq;
 159                 }
 160         }
 161
 162         if (req->session) {
 163                 session = req->session->smbXcli;
 164         }
 165
 166         if (transport->compound.related) {
 167                 additional_flags |= SMB2_HDR_FLAG_CHAINED;
 168         }
 169
 170         hdr_ofs = PTR_DIFF(req->out.hdr, req->out.buffer);
 171         pdu_len = req->out.size - hdr_ofs;
 172         body.data = req->out.body;
 173         body.length = req->out.body_fixed;
 174         dyn.data = req->out.body + req->out.body_fixed;
 175         dyn.length = pdu_len - (SMB2_HDR_BODY + req->out.body_fixed);
 176
 177         req->subreq = smb2cli_req_create(req,
 178                                          transport->ev,
 179                                          transport->conn,
 180                                          cmd,
 181                                          additional_flags,
 182                                          clear_flags,
 183                                          timeout_msec,
 184                                          pid,
 185                                          tid,
 186                                          session,
 187                                          body.data, body.length,
 188                                          dyn.data, dyn.length);
 189         if (req->subreq == NULL) {
 190                 req->state = SMB2_REQUEST_ERROR;
 191                 req->status = NT_STATUS_NO_MEMORY;
 192                 return;
 193         }
 194
 195         if (!tevent_req_is_in_progress(req->subreq)) {
 196                 req->state = SMB2_REQUEST_ERROR;
 197                 req->status = NT_STATUS_INTERNAL_ERROR;/* TODO */
 198                 return;
 199         }
 200
 201         tevent_req_set_callback(req->subreq, smb2_request_done, req);
 202
 203         smb2cli_req_set_notify_async(req->subreq);
 204         if (req->credit_charge) {
 205                 smb2cli_req_set_credit_charge(req->subreq, req->credit_charge);
 206         }
 207
 208         ZERO_STRUCT(req->out);
 209         req->state = SMB2_REQUEST_RECV;
 210
 211         if (num_reqs > 0) {
 212                 for (i=0; i < num_reqs; i++) {
 213                         if (reqs[i] != NULL) {
 214                                 continue;
 215                         }
 216
 217                         reqs[i] = req->subreq;
 218                         i++;
 219                         break;
 220                 }
 221
 222                 if (i < num_reqs) {
 223                         return;
 224                 }
 225         } else {
 226                 reqs = &req->subreq;
 227                 num_reqs = 1;
 228         }
 229         status = smb2cli_req_compound_submit(reqs, num_reqs);
 230
 231         TALLOC_FREE(transport->compound.reqs);
 232
 233         if (!NT_STATUS_IS_OK(status)) {
 234                 req->status = status;
 235                 req->state = SMB2_REQUEST_ERROR;
 236                 smbXcli_conn_disconnect(transport->conn, status);
 237         }
 238 }
 239
 240 static void smb2_request_done(struct tevent_req *subreq)
 241 {
 242         struct smb2_request *req =
 243                 tevent_req_callback_data(subreq,
 244                 struct smb2_request);
 245         ssize_t len;
 246         size_t i;
 247
 248         req->recv_iov = NULL;
 249
 250         req->status = smb2cli_req_recv(req->subreq, req, &req->recv_iov, NULL, 0);
 251         if (NT_STATUS_EQUAL(req->status, STATUS_PENDING)) {
 252                 req->cancel.can_cancel = true;
 253                 return;
 254         }
 255         TALLOC_FREE(req->subreq);
 256         if (!NT_STATUS_IS_OK(req->status)) {
 257                 if (req->recv_iov == NULL) {
 258                         req->state = SMB2_REQUEST_ERROR;
 259                         if (req->async.fn) {
 260                                 req->async.fn(req);
 261                         }
 262                         return;
 263                 }
 264         }
 265
 266         len = req->recv_iov[0].iov_len;
 267         for (i=1; i < 3; i++) {
 268                 uint8_t *p = req->recv_iov[i-1].iov_base;
 269                 uint8_t *c1 = req->recv_iov[i].iov_base;
 270                 uint8_t *c2 = p + req->recv_iov[i-1].iov_len;
 271
 272                 len += req->recv_iov[i].iov_len;
 273
 274                 if (req->recv_iov[i].iov_len == 0) {
 275                         continue;
 276                 }
 277
 278                 if (c1 != c2) {
 279                         req->status = NT_STATUS_INTERNAL_ERROR;
 280                         req->state = SMB2_REQUEST_ERROR;
 281                         if (req->async.fn) {
 282                                 req->async.fn(req);
 283                         }
 284                         return;
 285                 }
 286         }
 287
 288         req->in.buffer = req->recv_iov[0].iov_base;
 289         req->in.size = len;
 290         req->in.allocated = req->in.size;
 291
 292         req->in.hdr        =  req->recv_iov[0].iov_base;
 293         req->in.body       =  req->recv_iov[1].iov_base;
 294         req->in.dynamic    =  req->recv_iov[2].iov_base;
 295         req->in.body_fixed =  req->recv_iov[1].iov_len;
 296         req->in.body_size  =  req->in.body_fixed;
 297         req->in.body_size  += req->recv_iov[2].iov_len;
 298
 299         smb2_setup_bufinfo(req);
 300
 301         req->state = SMB2_REQUEST_DONE;
 302         if (req->async.fn) {
 303                 req->async.fn(req);
 304         }
 305 }
 306
 307 static void smb2_transport_break_handler(struct tevent_req *subreq)
 308 {
 309         struct smb2_transport *transport =
 310                 tevent_req_callback_data(subreq,
 311                 struct smb2_transport);
 312         NTSTATUS status;
 313         uint8_t *hdr;
 314         uint8_t *body;
 315         uint16_t len = 0;
 316         bool lease;
 317         struct iovec *recv_iov = NULL;
 318
 319         transport->break_subreq = NULL;
 320
 321         status = smb2cli_req_recv(subreq, transport, &recv_iov, NULL, 0);
 322         TALLOC_FREE(subreq);
 323         if (!NT_STATUS_IS_OK(status)) {
 324                 TALLOC_FREE(recv_iov);
 325                 smb2_transport_dead(transport, status);
 326                 return;
 327         }
 328
 329         /*
 330          * Setup the subreq to handle the
 331          * next incoming SMB2 Break.
 332          */
 333         subreq = smb2cli_req_create(transport,
 334                                     transport->ev,
 335                                     transport->conn,
 336                                     SMB2_OP_BREAK,
 337                                     0, /* additional_flags */
 338                                     0, /*clear_flags */
 339                                     0, /* timeout_msec */
 340                                     0, /* pid */
 341                                     0, /* tid */
 342                                     NULL, /* session */
 343                                     NULL, /* body */
 344                                     0, /* body_fixed */
 345                                     NULL, /* dyn */
 346                                     0); /* dyn_len */
 347         if (subreq != NULL) {
 348                 smbXcli_req_set_pending(subreq);
 349                 tevent_req_set_callback(subreq,
 350                                         smb2_transport_break_handler,
 351                                         transport);
 352                 transport->break_subreq = subreq;
 353         }
 354
 355         hdr = recv_iov[0].iov_base;
 356         body = recv_iov[1].iov_base;
 357
 358         len = recv_iov[1].iov_len;
 359         if (recv_iov[1].iov_len >= 2) {
 360                 len = CVAL(body, 0x00);
 361                 if (len != recv_iov[1].iov_len) {
 362                         len = recv_iov[1].iov_len;
 363                 }
 364         }
 365
 366         if (len == 24) {
 367                 lease = false;
 368         } else if (len == 44) {
 369                 lease = true;
 370         } else {
 371                 DEBUG(1,("Discarding smb2 oplock reply of invalid size %u\n",
 372                         (unsigned)len));
 373                 TALLOC_FREE(recv_iov);
 374                 status = NT_STATUS_INVALID_NETWORK_RESPONSE;
 375                 smb2_transport_dead(transport, status);
 376                 return;
 377         }
 378
 379         if (!lease && transport->oplock.handler) {
 380                 struct smb2_handle h;
 381                 uint8_t level;
 382
 383                 level = CVAL(body, 0x02);
 384                 smb2_pull_handle(body+0x08, &h);
 385
 386                 TALLOC_FREE(recv_iov);
 387
 388                 transport->oplock.handler(transport, &h, level,
 389                                           transport->oplock.private_data);
 390         } else if (lease && transport->lease.handler) {
 391                 struct smb2_lease_break lb;
 392
 393                 ZERO_STRUCT(lb);
 394                 lb.break_flags =                SVAL(body, 0x4);
 395                 memcpy(&lb.current_lease.lease_key, body+0x8,
 396                     sizeof(struct smb2_lease_key));
 397                 lb.current_lease.lease_state =  SVAL(body, 0x18);
 398                 lb.new_lease_state =            SVAL(body, 0x1C);
 399                 lb.break_reason =               SVAL(body, 0x20);
 400                 lb.access_mask_hint =           SVAL(body, 0x24);
 401                 lb.share_mask_hint =            SVAL(body, 0x28);
 402
 403                 TALLOC_FREE(recv_iov);
 404
 405                 transport->lease.handler(transport, &lb,
 406                     transport->lease.private_data);
 407         } else {
 408                 DEBUG(5,("Got SMB2 %s break with no handler\n",
 409                         lease ? "lease" : "oplock"));
 410         }
 411         TALLOC_FREE(recv_iov);
 412 }
 413
 414 NTSTATUS smb2_transport_compound_start(struct smb2_transport *transport,
 415                                        uint32_t num)
 416 {
 417         TALLOC_FREE(transport->compound.reqs);
 418         ZERO_STRUCT(transport->compound);
 419
 420         transport->compound.reqs = talloc_zero_array(transport,
 421                                                      struct tevent_req *,
 422                                                      num);
 423         if (transport->compound.reqs == NULL) {
 424                 return NT_STATUS_NO_MEMORY;
 425         }
 426
 427         return NT_STATUS_OK;
 428 }
 429
 430 void smb2_transport_compound_set_related(struct smb2_transport *transport,
 431                                          bool related)
 432 {
 433         transport->compound.related = related;
 434 }
 435
 436 void smb2_transport_credits_ask_num(struct smb2_transport *transport,
 437                                     uint16_t ask_num)
 438 {
 439         smb2cli_conn_set_max_credits(transport->conn, ask_num);
 440 }
 441
 442 static void idle_handler(struct tevent_context *ev,
 443                          struct tevent_timer *te, struct timeval t, void *private_data)
 444 {
 445         struct smb2_transport *transport = talloc_get_type(private_data,
 446                                                            struct smb2_transport);
 447         struct timeval next;
 448
 449         transport->idle.func(transport, transport->idle.private_data);
 450
 451         next = timeval_current_ofs_usec(transport->idle.period);
 452         transport->idle.te = tevent_add_timer(transport->ev,
 453                                               transport,
 454                                               next,
 455                                               idle_handler,
 456                                               transport);
 457 }
 458
 459 /*
 460   setup the idle handler for a transport
 461   the period is in microseconds
 462 */
 463 void smb2_transport_idle_handler(struct smb2_transport *transport,
 464                                  void (*idle_func)(struct smb2_transport *, void *),
 465                                  uint64_t period,
 466                                  void *private_data)
 467 {
 468         TALLOC_FREE(transport->idle.te);
 469
 470         transport->idle.func = idle_func;
 471         transport->idle.private_data = private_data;
 472         transport->idle.period = period;
 473
 474         transport->idle.te = tevent_add_timer(transport->ev,
 475                                               transport,
 476                                               timeval_current_ofs_usec(period),
 477                                               idle_handler,
 478                                               transport);
 479 }