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/*
Unix SMB/CIFS implementation.
Core SMB2 server
Copyright (C) Stefan Metzmacher 2009
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 "smbd/globals.h"
#include "../source4/libcli/smb2/smb2_constants.h"
static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
uint32_t in_smbpid,
uint64_t in_file_id_volatile,
uint32_t in_length,
uint64_t in_offset,
uint32_t in_minimum,
uint32_t in_remaining);
static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
DATA_BLOB *out_data,
uint32_t *out_remaining);
static void smbd_smb2_request_read_done(struct tevent_req *subreq);
NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
{
const uint8_t *inhdr;
const uint8_t *inbody;
int i = req->current_idx;
size_t expected_body_size = 0x31;
size_t body_size;
uint32_t in_smbpid;
uint32_t in_length;
uint64_t in_offset;
uint64_t in_file_id_persistent;
uint64_t in_file_id_volatile;
uint32_t in_minimum_count;
uint32_t in_remaining_bytes;
struct tevent_req *subreq;
inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
body_size = SVAL(inbody, 0x00);
if (body_size != expected_body_size) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
in_smbpid = IVAL(inhdr, SMB2_HDR_PID);
in_length = IVAL(inbody, 0x04);
in_offset = BVAL(inbody, 0x08);
in_file_id_persistent = BVAL(inbody, 0x10);
in_file_id_volatile = BVAL(inbody, 0x18);
in_minimum_count = IVAL(inbody, 0x20);
in_remaining_bytes = IVAL(inbody, 0x28);
/* check the max read size */
if (in_length > 0x00010000) {
DEBUG(0,("here:%s: 0x%08X: 0x%08X\n",
__location__, in_length, 0x00010000));
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
if (in_file_id_persistent != 0) {
return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
}
subreq = smbd_smb2_read_send(req,
req->conn->smb2.event_ctx,
req,
in_smbpid,
in_file_id_volatile,
in_length,
in_offset,
in_minimum_count,
in_remaining_bytes);
if (subreq == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
return NT_STATUS_OK;
}
static void smbd_smb2_request_read_done(struct tevent_req *subreq)
{
struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
struct smbd_smb2_request);
int i = req->current_idx;
uint8_t *outhdr;
DATA_BLOB outbody;
DATA_BLOB outdyn;
uint8_t out_data_offset;
DATA_BLOB out_data_buffer;
uint32_t out_data_remaining;
NTSTATUS status;
NTSTATUS error; /* transport error */
status = smbd_smb2_read_recv(subreq,
req,
&out_data_buffer,
&out_data_remaining);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
error = smbd_smb2_request_error(req, status);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->conn,
nt_errstr(error));
return;
}
return;
}
out_data_offset = SMB2_HDR_BODY + 0x10;
outhdr = (uint8_t *)req->out.vector[i].iov_base;
outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
if (outbody.data == NULL) {
error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->conn,
nt_errstr(error));
return;
}
return;
}
SSVAL(outbody.data, 0x00, 0x10 + 1); /* struct size */
SCVAL(outbody.data, 0x02,
out_data_offset); /* data offset */
SCVAL(outbody.data, 0x03, 0); /* reserved */
SIVAL(outbody.data, 0x04,
out_data_buffer.length); /* data length */
SIVAL(outbody.data, 0x08,
out_data_remaining); /* data remaining */
SIVAL(outbody.data, 0x0C, 0); /* reserved */
outdyn = out_data_buffer;
error = smbd_smb2_request_done(req, outbody, &outdyn);
if (!NT_STATUS_IS_OK(error)) {
smbd_server_connection_terminate(req->conn,
nt_errstr(error));
return;
}
}
struct smbd_smb2_read_state {
struct smbd_smb2_request *smb2req;
DATA_BLOB out_data;
uint32_t out_remaining;
};
static struct tevent_req *smbd_smb2_read_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct smbd_smb2_request *smb2req,
uint32_t in_smbpid,
uint64_t in_file_id_volatile,
uint32_t in_length,
uint64_t in_offset,
uint32_t in_minimum,
uint32_t in_remaining)
{
struct tevent_req *req;
struct smbd_smb2_read_state *state;
struct smb_request *smbreq;
connection_struct *conn = smb2req->tcon->compat_conn;
files_struct *fsp;
ssize_t nread = -1;
struct lock_struct lock;
req = tevent_req_create(mem_ctx, &state,
struct smbd_smb2_read_state);
if (req == NULL) {
return NULL;
}
state->smb2req = smb2req;
state->out_data = data_blob_null;
state->out_remaining = 0;
DEBUG(10,("smbd_smb2_read: file_id[0x%016llX]\n",
(unsigned long long)in_file_id_volatile));
smbreq = smbd_smb2_fake_smb_request(smb2req);
if (tevent_req_nomem(smbreq, req)) {
return tevent_req_post(req, ev);
}
fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
if (fsp == NULL) {
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
if (conn != fsp->conn) {
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
if (smb2req->session->vuid != fsp->vuid) {
tevent_req_nterror(req, NT_STATUS_FILE_CLOSED);
return tevent_req_post(req, ev);
}
if (!CHECK_READ(fsp, smbreq)) {
tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
return tevent_req_post(req, ev);
}
state->out_data = data_blob_talloc(state, NULL, in_length);
if (in_length > 0 && tevent_req_nomem(state->out_data.data, req)) {
return tevent_req_post(req, ev);
}
if (IS_IPC(smbreq->conn)) {
tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
return tevent_req_post(req, ev);
}
init_strict_lock_struct(fsp,
in_smbpid,
in_offset,
in_length,
READ_LOCK,
&lock);
if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
return tevent_req_post(req, ev);
}
nread = read_file(fsp,
(char *)state->out_data.data,
in_offset,
in_length);
SMB_VFS_STRICT_UNLOCK(conn, fsp, &lock);
if (nread < 0) {
DEBUG(5,("smbd_smb2_read: read_file[%s] nread[%lld]\n",
fsp->fsp_name, (long long)nread));
tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
return tevent_req_post(req, ev);
}
if (nread == 0 && in_length != 0) {
DEBUG(5,("smbd_smb2_read: read_file[%s] end of file\n",
fsp->fsp_name));
tevent_req_nterror(req, NT_STATUS_END_OF_FILE);
return tevent_req_post(req, ev);
}
state->out_data.length = nread;
state->out_remaining = 0;
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static NTSTATUS smbd_smb2_read_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
DATA_BLOB *out_data,
uint32_t *out_remaining)
{
NTSTATUS status;
struct smbd_smb2_read_state *state = tevent_req_data(req,
struct smbd_smb2_read_state);
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
*out_data = state->out_data;
talloc_steal(mem_ctx, out_data->data);
*out_remaining = state->out_remaining;
tevent_req_received(req);
return NT_STATUS_OK;
}
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