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#!/usr/bin/env python3
#
# Copyright (C) 2020 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# 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/>.

# - migrate relative path SSL certificate to absolute path, as certs are only
#   allowed to stored in /config/user-data/sstp/ this is pretty straight
#   forward move. Delete certificates from source directory

import os
import sys

from shutil import copy2
from stat import S_IRUSR, S_IWUSR, S_IRGRP, S_IROTH
from vyos.configtree import ConfigTree

if (len(sys.argv) < 1):
    print("Must specify file name!")
    sys.exit(1)

file_name = sys.argv[1]

with open(file_name, 'r') as f:
    config_file = f.read()

config = ConfigTree(config_file)
base_path = ['vpn', 'sstp', 'ssl']
if not config.exists(base_path):
    # Nothing to do
    sys.exit(0)
else:
    cert_path_old ='/config/user-data/sstp/'
    cert_path_new ='/config/auth/sstp/'

    if not os.path.isdir(cert_path_new):
        os.mkdir(cert_path_new)

    #
    # migrate ca-cert-file to new path
    if config.exists(base_path + ['ca-cert-file']):
        tmp = config.return_value(base_path + ['ca-cert-file'])
        cert_old = cert_path_old + tmp
        cert_new = cert_path_new + tmp

        if os.path.isfile(cert_old):
            # adjust file permissions on source file,
            # permissions will be copied by copy2()
            os.chmod(cert_old, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
            copy2(cert_old, cert_path_new)
            # delete old certificate file
            os.unlink(cert_old)

        config.set(base_path + ['ca-cert-file'], value=cert_new, replace=True)

    #
    # migrate cert-file to new path
    if config.exists(base_path + ['cert-file']):
        tmp = config.return_value(base_path + ['cert-file'])
        cert_old = cert_path_old + tmp
        cert_new = cert_path_new + tmp

        if os.path.isfile(cert_old):
            # adjust file permissions on source file,
            # permissions will be copied by copy2()
            os.chmod(cert_old, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
            copy2(cert_old, cert_path_new)
            # delete old certificate file
            os.unlink(cert_old)

        config.set(base_path + ['cert-file'], value=cert_new, replace=True)

    #
    # migrate key-file to new path
    if config.exists(base_path + ['key-file']):
        tmp = config.return_value(base_path + ['key-file'])
        cert_old = cert_path_old + tmp
        cert_new = cert_path_new + tmp

        if os.path.isfile(cert_old):
            # adjust file permissions on source file,
            # permissions will be copied by copy2()
            os.chmod(cert_old, S_IRUSR | S_IWUSR)
            copy2(cert_old, cert_path_new)
            # delete old certificate file
            os.unlink(cert_old)

        config.set(base_path + ['key-file'], value=cert_new, replace=True)

    #
    # check if old certificate directory exists but is empty
    if os.path.isdir(cert_path_old) and not os.listdir(cert_path_old):
        os.rmdir(cert_path_old)

    try:
        with open(file_name, 'w') as f:
            f.write(config.to_string())
    except OSError as e:
        print("Failed to save the modified config: {}".format(e))
        sys.exit(1)