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/*
Unix SMB/CIFS implementation.
smb2 lib
Copyright (C) Volker Lendecke 2011
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 "client.h"
#include "async_smb.h"
#include "smb2cli_base.h"
#include "smb2cli.h"
#include "libsmb/proto.h"
#include "librpc/ndr/libndr.h"
#include "lib/util/tevent_ntstatus.h"
struct smb2cli_negprot_state {
struct cli_state *cli;
uint8_t fixed[36];
uint8_t dyn[4];
};
static void smb2cli_negprot_done(struct tevent_req *subreq);
struct tevent_req *smb2cli_negprot_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct cli_state *cli)
{
struct tevent_req *req, *subreq;
struct smb2cli_negprot_state *state;
uint8_t *buf;
req = tevent_req_create(mem_ctx, &state,
struct smb2cli_negprot_state);
if (req == NULL) {
return NULL;
}
state->cli = cli;
buf = state->fixed;
SSVAL(buf, 0, 36);
SSVAL(buf, 2, 2); /* DialectCount */
if (client_is_signing_mandatory(cli)) {
SSVAL(buf, 4, SMB2_NEGOTIATE_SIGNING_REQUIRED);
} else {
SSVAL(buf, 4, SMB2_NEGOTIATE_SIGNING_ENABLED);
}
SSVAL(buf, 6, 0); /* Reserved */
SSVAL(buf, 8, 0); /* Capabilities */
memset(buf+12, 0, 16); /* ClientGuid */
SBVAL(buf, 28, 0); /* ClientStartTime */
buf = state->dyn;
SSVAL(buf, 0, 0x202); /* SMB2.002 */
SSVAL(buf, 2, 0x210); /* SMB2.1 */
subreq = smb2cli_req_send(state, ev, cli, SMB2_OP_NEGPROT, 0,
state->fixed, sizeof(state->fixed),
state->dyn, sizeof(state->dyn));
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, smb2cli_negprot_done, req);
return req;
}
static void smb2cli_negprot_done(struct tevent_req *subreq)
{
struct tevent_req *req =
tevent_req_callback_data(subreq,
struct tevent_req);
struct smb2cli_negprot_state *state =
tevent_req_data(req,
struct smb2cli_negprot_state);
struct cli_state *cli = state->cli;
size_t security_offset, security_length;
DATA_BLOB blob;
NTSTATUS status;
struct iovec *iov;
uint8_t *body;
status = smb2cli_req_recv(subreq, talloc_tos(), &iov, 65);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(subreq);
tevent_req_nterror(req, status);
return;
}
body = (uint8_t *)iov[1].iov_base;
cli->smb2.security_mode = SVAL(body, 2);
cli->smb2.dialect_revision = SVAL(body, 4);
blob = data_blob_const(body + 8, 16);
GUID_from_data_blob(&blob, &cli->smb2.server_guid);
cli->smb2.server_capabilities = IVAL(body, 24);
cli->smb2.max_transact_size = IVAL(body, 28);
cli->smb2.max_read_size = IVAL(body, 32);
cli->smb2.max_write_size = IVAL(body, 36);
cli->smb2.system_time = interpret_long_date((char *)body + 40);
cli->smb2.server_start_time = interpret_long_date((char *)body + 48);
security_offset = SVAL(body, 56);
security_length = SVAL(body, 58);
if ((security_offset != SMB2_HDR_BODY + iov[1].iov_len) ||
(security_length > iov[2].iov_len)) {
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
cli->secblob = data_blob(iov[1].iov_base, security_length);
tevent_req_done(req);
}
NTSTATUS smb2cli_negprot_recv(struct tevent_req *req)
{
return tevent_req_simple_recv_ntstatus(req);
}
NTSTATUS smb2cli_negprot(struct cli_state *cli)
{
TALLOC_CTX *frame = talloc_stackframe();
struct event_context *ev;
struct tevent_req *req;
NTSTATUS status = NT_STATUS_NO_MEMORY;
if (cli_has_async_calls(cli)) {
/*
* Can't use sync call while an async call is in flight
*/
status = NT_STATUS_INVALID_PARAMETER;
goto fail;
}
ev = event_context_init(frame);
if (ev == NULL) {
goto fail;
}
req = smb2cli_negprot_send(frame, ev, cli);
if (req == NULL) {
goto fail;
}
if (!tevent_req_poll_ntstatus(req, ev, &status)) {
goto fail;
}
status = smb2cli_negprot_recv(req);
fail:
TALLOC_FREE(frame);
return status;
}
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