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/*
* VFS module to disallow writes for older files
*
* Copyright (C) 2013, Volker Lendecke
*
* 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/smbd.h"
#include "system/filesys.h"
#include "libcli/security/security.h"
static NTSTATUS vfs_worm_create_file(vfs_handle_struct *handle,
struct smb_request *req,
uint16_t root_dir_fid,
struct smb_filename *smb_fname,
uint32_t access_mask,
uint32_t share_access,
uint32_t create_disposition,
uint32_t create_options,
uint32_t file_attributes,
uint32_t oplock_request,
uint64_t allocation_size,
uint32_t private_flags,
struct security_descriptor *sd,
struct ea_list *ea_list,
files_struct **result,
int *pinfo)
{
bool readonly = false;
const uint32_t write_access_flags =
FILE_WRITE_DATA | FILE_APPEND_DATA |
FILE_WRITE_ATTRIBUTES | DELETE_ACCESS |
WRITE_DAC_ACCESS | WRITE_OWNER_ACCESS;
NTSTATUS status;
if (VALID_STAT(smb_fname->st)) {
double age;
age = timespec_elapsed(&smb_fname->st.st_ex_ctime);
if (age > lp_parm_int(SNUM(handle->conn), "worm",
"grace_period", 3600)) {
readonly = true;
}
}
if (readonly && (access_mask & write_access_flags)) {
return NT_STATUS_ACCESS_DENIED;
}
status = SMB_VFS_NEXT_CREATE_FILE(
handle, req, root_dir_fid, smb_fname, access_mask,
share_access, create_disposition, create_options,
file_attributes, oplock_request, allocation_size,
private_flags, sd, ea_list, result, pinfo);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
/*
* Access via MAXIMUM_ALLOWED_ACCESS?
*/
if (readonly && ((*result)->access_mask & write_access_flags)) {
close_file(req, *result, NORMAL_CLOSE);
return NT_STATUS_ACCESS_DENIED;
}
return NT_STATUS_OK;
}
static struct vfs_fn_pointers vfs_worm_fns = {
.create_file_fn = vfs_worm_create_file,
};
NTSTATUS vfs_worm_init(void);
NTSTATUS vfs_worm_init(void)
{
NTSTATUS ret;
ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "worm",
&vfs_worm_fns);
if (!NT_STATUS_IS_OK(ret)) {
return ret;
}
return ret;
}
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