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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 NTSTATUS smbd_smb2_read(struct smbd_smb2_request *req,
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,
DATA_BLOB *out_data_buffer,
uint32_t *out_remaining);
NTSTATUS smbd_smb2_request_process_read(struct smbd_smb2_request *req)
{
const uint8_t *inhdr;
const uint8_t *inbody;
int i = req->current_idx;
uint8_t *outhdr;
DATA_BLOB outbody;
DATA_BLOB outdyn;
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;
uint8_t out_data_offset;
DATA_BLOB out_data_buffer;
uint32_t out_data_remaining;
NTSTATUS status;
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);
}
status = smbd_smb2_read(req,
in_smbpid,
in_file_id_volatile,
in_length,
in_offset,
in_minimum_count,
in_remaining_bytes,
&out_data_buffer,
&out_data_remaining);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
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) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
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;
return smbd_smb2_request_done(req, outbody, &outdyn);
}
static NTSTATUS smbd_smb2_read(struct smbd_smb2_request *req,
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,
DATA_BLOB *out_data_buffer,
uint32_t *out_remaining)
{
struct smb_request *smbreq;
connection_struct *conn = req->tcon->compat_conn;
files_struct *fsp;
ssize_t nread = -1;
struct lock_struct lock;
DEBUG(10,("smbd_smb2_read: file_id[0x%016llX]\n",
(unsigned long long)in_file_id_volatile));
smbreq = smbd_smb2_fake_smb_request(req);
if (smbreq == NULL) {
return NT_STATUS_NO_MEMORY;
}
/* If it's an IPC, pass off the pipe handler. */
if (IS_IPC(conn)) {
return NT_STATUS_NOT_IMPLEMENTED;
}
fsp = file_fsp(smbreq, (uint16_t)in_file_id_volatile);
if (fsp == NULL) {
return NT_STATUS_FILE_CLOSED;
}
if (conn != fsp->conn) {
return NT_STATUS_FILE_CLOSED;
}
if (req->session->vuid != fsp->vuid) {
return NT_STATUS_FILE_CLOSED;
}
if (!CHECK_READ(fsp, smbreq)) {
return NT_STATUS_ACCESS_DENIED;
}
*out_data_buffer = data_blob_talloc(req, NULL, in_length);
if (in_length > 0 && out_data_buffer->data == NULL) {
return NT_STATUS_NO_MEMORY;
}
init_strict_lock_struct(fsp,
in_smbpid,
in_offset,
in_length,
READ_LOCK,
&lock);
if (!SMB_VFS_STRICT_LOCK(conn, fsp, &lock)) {
return NT_STATUS_FILE_LOCK_CONFLICT;
}
nread = read_file(fsp,
(char *)out_data_buffer->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));
return NT_STATUS_ACCESS_DENIED;
}
if (nread == 0 && in_length != 0) {
DEBUG(5,("smbd_smb2_read: read_file[%s] end of file\n",
fsp->fsp_name));
return NT_STATUS_END_OF_FILE;
}
out_data_buffer->length = nread;
*out_remaining = 0;
return NT_STATUS_OK;
}
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