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samba-mirror/source4/libcli/smb2/transport.c

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/*
Unix SMB/CIFS implementation.
SMB2 client transport context management functions
Copyright (C) Andrew Tridgell 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libcli/raw/libcliraw.h"
#include "libcli/raw/raw_proto.h"
#include "libcli/smb2/smb2.h"
#include "libcli/smb2/smb2_calls.h"
#include "lib/socket/socket.h"
#include "lib/events/events.h"
#include "lib/stream/packet.h"
#include "../lib/util/dlinklist.h"
/*
an event has happened on the socket
*/
static void smb2_transport_event_handler(struct tevent_context *ev,
struct tevent_fd *fde,
uint16_t flags, void *private_data)
{
struct smb2_transport *transport = talloc_get_type(private_data,
struct smb2_transport);
if (flags & TEVENT_FD_READ) {
packet_recv(transport->packet);
return;
}
if (flags & TEVENT_FD_WRITE) {
packet_queue_run(transport->packet);
}
}
/*
destroy a transport
*/
static int transport_destructor(struct smb2_transport *transport)
{
smb2_transport_dead(transport, NT_STATUS_LOCAL_DISCONNECT);
return 0;
}
/*
handle receive errors
*/
static void smb2_transport_error(void *private_data, NTSTATUS status)
{
struct smb2_transport *transport = talloc_get_type(private_data,
struct smb2_transport);
smb2_transport_dead(transport, status);
}
static NTSTATUS smb2_transport_finish_recv(void *private_data, DATA_BLOB blob);
/*
create a transport structure based on an established socket
*/
struct smb2_transport *smb2_transport_init(struct smbcli_socket *sock,
TALLOC_CTX *parent_ctx,
struct smbcli_options *options)
{
struct smb2_transport *transport;
transport = talloc_zero(parent_ctx, struct smb2_transport);
if (!transport) return NULL;
transport->socket = talloc_steal(transport, sock);
transport->options = *options;
transport->credits.charge = 0;
transport->credits.ask_num = 1;
/* setup the stream -> packet parser */
transport->packet = packet_init(transport);
if (transport->packet == NULL) {
talloc_free(transport);
return NULL;
}
packet_set_private(transport->packet, transport);
packet_set_socket(transport->packet, transport->socket->sock);
packet_set_callback(transport->packet, smb2_transport_finish_recv);
packet_set_full_request(transport->packet, packet_full_request_nbt);
packet_set_error_handler(transport->packet, smb2_transport_error);
packet_set_event_context(transport->packet, transport->socket->event.ctx);
packet_set_nofree(transport->packet);
/* take over event handling from the socket layer - it only
handles events up until we are connected */
talloc_free(transport->socket->event.fde);
transport->socket->event.fde = tevent_add_fd(transport->socket->event.ctx,
transport->socket,
socket_get_fd(transport->socket->sock),
TEVENT_FD_READ,
smb2_transport_event_handler,
transport);
packet_set_fde(transport->packet, transport->socket->event.fde);
packet_set_serialise(transport->packet);
talloc_set_destructor(transport, transport_destructor);
return transport;
}
/*
mark the transport as dead
*/
void smb2_transport_dead(struct smb2_transport *transport, NTSTATUS status)
{
smbcli_sock_dead(transport->socket);
if (NT_STATUS_EQUAL(NT_STATUS_UNSUCCESSFUL, status)) {
status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
}
/* kill all pending receives */
while (transport->pending_recv) {
struct smb2_request *req = transport->pending_recv;
req->state = SMB2_REQUEST_ERROR;
req->status = status;
DLIST_REMOVE(transport->pending_recv, req);
if (req->async.fn) {
req->async.fn(req);
}
}
}
static NTSTATUS smb2_handle_oplock_break(struct smb2_transport *transport,
const DATA_BLOB *blob)
{
uint8_t *hdr;
uint8_t *body;
uint16_t len, bloblen;
bool lease;
hdr = blob->data+NBT_HDR_SIZE;
body = hdr+SMB2_HDR_BODY;
bloblen = blob->length - SMB2_HDR_BODY;
if (bloblen < 2) {
DEBUG(1,("Discarding smb2 oplock reply of size %u\n",
(unsigned)blob->length));
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
len = CVAL(body, 0x00);
if (len > bloblen) {
DEBUG(1,("Discarding smb2 oplock reply,"
"packet claims %u byte body, only %u bytes seen\n",
len, bloblen));
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
if (len == 24) {
lease = false;
} else if (len == 44) {
lease = true;
} else {
DEBUG(1,("Discarding smb2 oplock reply of invalid size %u\n",
(unsigned)blob->length));
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
if (!lease && transport->oplock.handler) {
struct smb2_handle h;
uint8_t level;
level = CVAL(body, 0x02);
smb2_pull_handle(body+0x08, &h);
transport->oplock.handler(transport, &h, level,
transport->oplock.private_data);
} else if (lease && transport->lease.handler) {
struct smb2_lease_break lb;
ZERO_STRUCT(lb);
lb.break_flags = SVAL(body, 0x4);
memcpy(&lb.current_lease.lease_key, body+0x8,
sizeof(struct smb2_lease_key));
lb.current_lease.lease_state = SVAL(body, 0x18);
lb.new_lease_state = SVAL(body, 0x1C);
lb.break_reason = SVAL(body, 0x20);
lb.access_mask_hint = SVAL(body, 0x24);
lb.share_mask_hint = SVAL(body, 0x28);
transport->lease.handler(transport, &lb,
transport->lease.private_data);
} else {
DEBUG(5,("Got SMB2 %s break with no handler\n",
lease ? "lease" : "oplock"));
}
return NT_STATUS_OK;
}
struct smb2_transport_compount_response_state {
struct smb2_transport *transport;
DATA_BLOB blob;
};
static void smb2_transport_compound_response_handler(struct tevent_context *ctx,
struct tevent_immediate *im,
void *private_data)
{
struct smb2_transport_compount_response_state *state =
talloc_get_type_abort(private_data,
struct smb2_transport_compount_response_state);
struct smb2_transport *transport = state->transport;
NTSTATUS status;
status = smb2_transport_finish_recv(transport, state->blob);
TALLOC_FREE(state);
if (!NT_STATUS_IS_OK(status)) {
smb2_transport_error(transport, status);
}
}
/*
we have a full request in our receive buffer - match it to a pending request
and process
*/
static NTSTATUS smb2_transport_finish_recv(void *private_data, DATA_BLOB blob)
{
struct smb2_transport *transport = talloc_get_type(private_data,
struct smb2_transport);
uint8_t *buffer, *hdr;
int len;
struct smb2_request *req = NULL;
uint64_t seqnum;
uint32_t flags;
uint16_t buffer_code;
uint32_t dynamic_size;
uint32_t i;
uint16_t opcode;
NTSTATUS status;
uint32_t next_ofs;
buffer = blob.data;
len = blob.length;
hdr = buffer+NBT_HDR_SIZE;
if (len < SMB2_MIN_SIZE) {
DEBUG(1,("Discarding smb2 reply of size %d\n", len));
goto error;
}
flags = IVAL(hdr, SMB2_HDR_FLAGS);
seqnum = BVAL(hdr, SMB2_HDR_MESSAGE_ID);
opcode = SVAL(hdr, SMB2_HDR_OPCODE);
/* see MS-SMB2 3.2.5.19 */
if (seqnum == UINT64_MAX) {
if (opcode != SMB2_OP_BREAK) {
DEBUG(1,("Discarding packet with invalid seqnum, "
"opcode %u\n", opcode));
return NT_STATUS_INVALID_NETWORK_RESPONSE;
}
return smb2_handle_oplock_break(transport, &blob);
}
if (opcode == SMB2_OP_CANCEL) {
/*
* ignore responses to cancel requests,
* this can happen if signing was wrong or
* we specified the wrong session id
*/
talloc_free(buffer);
return NT_STATUS_OK;
}
/* match the incoming request against the list of pending requests */
for (req=transport->pending_recv; req; req=req->next) {
if (req->seqnum == seqnum) break;
}
if (!req) {
DEBUG(1,("Discarding unmatched reply with seqnum 0x%llx op %d\n",
(long long)seqnum, SVAL(hdr, SMB2_HDR_OPCODE)));
goto error;
}
/* fill in the 'in' portion of the matching request */
req->in.buffer = buffer;
talloc_steal(req, buffer);
req->in.size = len;
req->in.allocated = req->in.size;
req->in.hdr = hdr;
req->in.body = hdr+SMB2_HDR_BODY;
req->in.body_size = req->in.size - (SMB2_HDR_BODY+NBT_HDR_SIZE);
req->status = NT_STATUS(IVAL(hdr, SMB2_HDR_STATUS));
if ((flags & SMB2_HDR_FLAG_ASYNC) &&
NT_STATUS_EQUAL(req->status, STATUS_PENDING)) {
req->cancel.can_cancel = true;
req->cancel.async_id = BVAL(hdr, SMB2_HDR_ASYNC_ID);
for (i=0; i< req->cancel.do_cancel; i++) {
smb2_cancel(req);
}
talloc_free(buffer);
return NT_STATUS_OK;
}
next_ofs = IVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND);
if (next_ofs > 0) {
if (smb2_oob(&req->in, req->in.hdr + next_ofs, SMB2_HDR_BODY + 2)) {
DEBUG(1,("SMB2 request invalid next offset 0x%x\n",
next_ofs));
goto error;
}
req->in.size = NBT_HDR_SIZE + next_ofs;
req->in.body_size = req->in.size - (SMB2_HDR_BODY+NBT_HDR_SIZE);
}
if (req->session && req->session->signing_active &&
!NT_STATUS_EQUAL(req->status, NT_STATUS_USER_SESSION_DELETED)) {
status = smb2_check_signature(&req->in,
req->session->session_key);
if (!NT_STATUS_IS_OK(status)) {
/* the spec says to ignore packets with a bad signature */
talloc_free(buffer);
return status;
}
}
buffer_code = SVAL(req->in.body, 0);
req->in.body_fixed = (buffer_code & ~1);
req->in.dynamic = NULL;
dynamic_size = req->in.body_size - req->in.body_fixed;
if (dynamic_size != 0 && (buffer_code & 1)) {
req->in.dynamic = req->in.body + req->in.body_fixed;
if (smb2_oob(&req->in, req->in.dynamic, dynamic_size)) {
DEBUG(1,("SMB2 request invalid dynamic size 0x%x\n",
dynamic_size));
goto error;
}
}
smb2_setup_bufinfo(req);
DEBUG(2, ("SMB2 RECV seqnum=0x%llx\n", (long long)req->seqnum));
dump_data(5, req->in.body, req->in.body_size);
if (next_ofs > 0) {
struct tevent_immediate *im;
struct smb2_transport_compount_response_state *state;
state = talloc(transport,
struct smb2_transport_compount_response_state);
if (!state) {
goto error;
}
state->transport = transport;
state->blob = data_blob_talloc(state, NULL,
blob.length - next_ofs);
if (!state->blob.data) {
goto error;
}
im = tevent_create_immediate(state);
if (!im) {
TALLOC_FREE(state);
goto error;
}
_smb2_setlen(state->blob.data, state->blob.length - NBT_HDR_SIZE);
memcpy(state->blob.data + NBT_HDR_SIZE,
req->in.hdr + next_ofs,
req->in.allocated - req->in.size);
tevent_schedule_immediate(im, transport->socket->event.ctx,
smb2_transport_compound_response_handler,
state);
}
/* if this request has an async handler then call that to
notify that the reply has been received. This might destroy
the request so it must happen last */
DLIST_REMOVE(transport->pending_recv, req);
req->state = SMB2_REQUEST_DONE;
if (req->async.fn) {
req->async.fn(req);
}
return NT_STATUS_OK;
error:
dump_data(5, buffer, len);
if (req) {
DLIST_REMOVE(transport->pending_recv, req);
req->state = SMB2_REQUEST_ERROR;
if (req->async.fn) {
req->async.fn(req);
}
} else {
talloc_free(buffer);
}
return NT_STATUS_UNSUCCESSFUL;
}
/*
handle timeouts of individual smb requests
*/
static void smb2_timeout_handler(struct tevent_context *ev, struct tevent_timer *te,
struct timeval t, void *private_data)
{
struct smb2_request *req = talloc_get_type(private_data, struct smb2_request);
if (req->state == SMB2_REQUEST_RECV) {
DLIST_REMOVE(req->transport->pending_recv, req);
}
req->status = NT_STATUS_IO_TIMEOUT;
req->state = SMB2_REQUEST_ERROR;
if (req->async.fn) {
req->async.fn(req);
}
}
/*
destroy a request
*/
static int smb2_request_destructor(struct smb2_request *req)
{
if (req->state == SMB2_REQUEST_RECV) {
DLIST_REMOVE(req->transport->pending_recv, req);
}
return 0;
}
static NTSTATUS smb2_transport_raw_send(struct smb2_transport *transport,
struct smb2_request_buffer *buffer)
{
DATA_BLOB blob;
NTSTATUS status;
/* check if the transport is dead */
if (transport->socket->sock == NULL) {
return NT_STATUS_NET_WRITE_FAULT;
}
_smb2_setlen(buffer->buffer, buffer->size - NBT_HDR_SIZE);
blob = data_blob_const(buffer->buffer, buffer->size);
status = packet_send(transport->packet, blob);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
return NT_STATUS_OK;
}
/*
put a request into the send queue
*/
void smb2_transport_send(struct smb2_request *req)
{
NTSTATUS status;
DEBUG(2, ("SMB2 send seqnum=0x%llx\n", (long long)req->seqnum));
dump_data(5, req->out.body, req->out.body_size);
if (req->transport->compound.missing > 0) {
off_t next_ofs;
size_t pad = 0;
uint8_t *end;
end = req->out.buffer + req->out.size;
/*
* we need to set dynamic otherwise
* smb2_grow_buffer segfaults
*/
if (req->out.dynamic == NULL) {
req->out.dynamic = end;
}
next_ofs = end - req->out.hdr;
if ((next_ofs % 8) > 0) {
pad = 8 - (next_ofs % 8);
}
next_ofs += pad;
status = smb2_grow_buffer(&req->out, pad);
if (!NT_STATUS_IS_OK(status)) {
req->state = SMB2_REQUEST_ERROR;
req->status = status;
return;
}
req->out.size += pad;
SIVAL(req->out.hdr, SMB2_HDR_NEXT_COMMAND, next_ofs);
}
/* possibly sign the message */
if (req->session && req->session->signing_active) {
status = smb2_sign_message(&req->out, req->session->session_key);
if (!NT_STATUS_IS_OK(status)) {
req->state = SMB2_REQUEST_ERROR;
req->status = status;
return;
}
}
if (req->transport->compound.missing > 0) {
req->transport->compound.buffer = req->out;
} else {
status = smb2_transport_raw_send(req->transport,
&req->out);
if (!NT_STATUS_IS_OK(status)) {
req->state = SMB2_REQUEST_ERROR;
req->status = status;
return;
}
}
ZERO_STRUCT(req->out);
req->state = SMB2_REQUEST_RECV;
DLIST_ADD(req->transport->pending_recv, req);
/* add a timeout */
if (req->transport->options.request_timeout) {
tevent_add_timer(req->transport->socket->event.ctx, req,
timeval_current_ofs(req->transport->options.request_timeout, 0),
smb2_timeout_handler, req);
}
talloc_set_destructor(req, smb2_request_destructor);
}
NTSTATUS smb2_transport_compound_start(struct smb2_transport *transport,
uint32_t num)
{
ZERO_STRUCT(transport->compound);
transport->compound.missing = num;
return NT_STATUS_OK;
}
void smb2_transport_compound_set_related(struct smb2_transport *transport,
bool related)
{
transport->compound.related = related;
}
void smb2_transport_credits_ask_num(struct smb2_transport *transport,
uint16_t ask_num)
{
transport->credits.ask_num = ask_num;
}
void smb2_transport_credits_set_charge(struct smb2_transport *transport,
uint16_t charge)
{
transport->credits.charge = charge;
}
static void idle_handler(struct tevent_context *ev,
struct tevent_timer *te, struct timeval t, void *private_data)
{
struct smb2_transport *transport = talloc_get_type(private_data,
struct smb2_transport);
struct timeval next = timeval_add(&t, 0, transport->idle.period);
transport->socket->event.te = tevent_add_timer(transport->socket->event.ctx,
transport,
next,
idle_handler, transport);
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transport->idle.func(transport, transport->idle.private_data);
}
/*
setup the idle handler for a transport
the period is in microseconds
*/
void smb2_transport_idle_handler(struct smb2_transport *transport,
void (*idle_func)(struct smb2_transport *, void *),
uint64_t period,
void *private_data)
{
transport->idle.func = idle_func;
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transport->idle.private_data = private_data;
transport->idle.period = period;
if (transport->socket->event.te != NULL) {
talloc_free(transport->socket->event.te);
}
transport->socket->event.te = tevent_add_timer(transport->socket->event.ctx,
transport,
timeval_current_ofs(0, period),
idle_handler, transport);
}