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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 "system/network.h"
#include "../lib/util/tevent_ntstatus.h"
#include "../libcli/smb/smb_common.h"
#include "../libcli/smb/smbXcli_base.h"
struct smb2cli_session_setup_state {
struct smbXcli_session *session;
uint8_t fixed[24];
uint8_t dyn_pad[1];
struct iovec *recv_iov;
DATA_BLOB out_security_buffer;
NTSTATUS status;
};
static void smb2cli_session_setup_done(struct tevent_req *subreq);
struct tevent_req *smb2cli_session_setup_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbXcli_conn *conn,
uint32_t timeout_msec,
struct smbXcli_session *session,
uint8_t in_flags,
uint32_t in_capabilities,
uint32_t in_channel,
uint64_t in_previous_session_id,
const DATA_BLOB *in_security_buffer)
{
struct tevent_req *req, *subreq;
struct smb2cli_session_setup_state *state;
uint8_t *buf;
uint8_t *dyn;
size_t dyn_len;
uint8_t security_mode;
uint16_t security_buffer_offset = 0;
uint16_t security_buffer_length = 0;
req = tevent_req_create(mem_ctx, &state,
struct smb2cli_session_setup_state);
if (req == NULL) {
return NULL;
}
if (session == NULL) {
tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
return tevent_req_post(req, ev);
}
state->session = session;
security_mode = smb2cli_session_security_mode(session);
if (in_security_buffer) {
if (in_security_buffer->length > UINT16_MAX) {
tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
return tevent_req_post(req, ev);
}
security_buffer_offset = SMB2_HDR_BODY + 24;
security_buffer_length = in_security_buffer->length;
}
buf = state->fixed;
SSVAL(buf, 0, 25);
SCVAL(buf, 2, in_flags);
SCVAL(buf, 3, security_mode);
SIVAL(buf, 4, in_capabilities);
SIVAL(buf, 8, in_channel);
SSVAL(buf, 12, security_buffer_offset);
SSVAL(buf, 14, security_buffer_length);
SBVAL(buf, 16, in_previous_session_id);
if (security_buffer_length > 0) {
dyn = in_security_buffer->data;
dyn_len = in_security_buffer->length;
} else {
dyn = state->dyn_pad;;
dyn_len = sizeof(state->dyn_pad);
}
subreq = smb2cli_req_send(state, ev,
conn, SMB2_OP_SESSSETUP,
0, 0, /* flags */
timeout_msec,
0xFEFF,
0, /* tid */
session,
state->fixed, sizeof(state->fixed),
dyn, dyn_len);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, smb2cli_session_setup_done, req);
return req;
}
static void smb2cli_session_setup_done(struct tevent_req *subreq)
{
struct tevent_req *req =
tevent_req_callback_data(subreq,
struct tevent_req);
struct smb2cli_session_setup_state *state =
tevent_req_data(req,
struct smb2cli_session_setup_state);
NTSTATUS status;
uint64_t current_session_id;
uint64_t session_id;
uint16_t session_flags;
uint16_t expected_offset = 0;
uint16_t security_buffer_offset;
uint16_t security_buffer_length;
uint8_t *security_buffer_data = NULL;
const uint8_t *hdr;
const uint8_t *body;
static const struct smb2cli_req_expected_response expected[] = {
{
.status = NT_STATUS_MORE_PROCESSING_REQUIRED,
.body_size = 0x09
},
{
.status = NT_STATUS_OK,
.body_size = 0x09
}
};
status = smb2cli_req_recv(subreq, state, &state->recv_iov,
expected, ARRAY_SIZE(expected));
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status) &&
!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
tevent_req_nterror(req, status);
return;
}
hdr = (const uint8_t *)state->recv_iov[0].iov_base;
body = (const uint8_t *)state->recv_iov[1].iov_base;
session_id = BVAL(hdr, SMB2_HDR_SESSION_ID);
session_flags = SVAL(body, 2);
security_buffer_offset = SVAL(body, 4);
security_buffer_length = SVAL(body, 6);
if (security_buffer_length > 0) {
expected_offset = SMB2_HDR_BODY + 8;
}
if (security_buffer_offset != 0) {
security_buffer_data = (uint8_t *)state->recv_iov[2].iov_base;
expected_offset = SMB2_HDR_BODY + 8;
}
if (security_buffer_offset != expected_offset) {
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
if (security_buffer_length > state->recv_iov[2].iov_len) {
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
state->out_security_buffer.data = security_buffer_data;
state->out_security_buffer.length = security_buffer_length;
current_session_id = smb2cli_session_current_id(state->session);
if (current_session_id == 0) {
/* A new session was requested */
current_session_id = session_id;
}
if (current_session_id != session_id) {
tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
return;
}
smb2cli_session_set_id_and_flags(state->session,
session_id, session_flags);
state->status = status;
tevent_req_done(req);
}
NTSTATUS smb2cli_session_setup_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
struct iovec **recv_iov,
DATA_BLOB *out_security_buffer)
{
struct smb2cli_session_setup_state *state =
tevent_req_data(req,
struct smb2cli_session_setup_state);
NTSTATUS status;
struct iovec *_tmp;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
if (recv_iov == NULL) {
recv_iov = &_tmp;
}
*recv_iov = talloc_move(mem_ctx, &state->recv_iov);
*out_security_buffer = state->out_security_buffer;
/*
* Return the status from the server:
* NT_STATUS_MORE_PROCESSING_REQUIRED or
* NT_STATUS_OK.
*/
status = state->status;
tevent_req_received(req);
return status;
}
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