mirror of
https://github.com/freedombox/FreedomBox.git
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156 lines
4.6 KiB
Python
Executable File
156 lines
4.6 KiB
Python
Executable File
#!/usr/bin/python3
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#
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# This file is part of FreedomBox.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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"""
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Configuration helper for SSH server.
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"""
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import argparse
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import os
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import pwd
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import shutil
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import stat
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import subprocess
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import sys
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import augeas
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from plinth import action_utils
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def parse_arguments():
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"""Return parsed command line arguments as dictionary."""
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parser = argparse.ArgumentParser()
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subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
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subparsers.add_parser('setup', help='Setup SSH server')
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get_keys = subparsers.add_parser('get-keys',
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help='Get SSH authorized keys')
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get_keys.add_argument('--username')
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set_keys = subparsers.add_parser('set-keys',
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help='Set SSH authorized keys')
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set_keys.add_argument('--username')
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set_keys.add_argument('--keys')
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subparsers.add_parser('get-password-config',
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help='Get SSH password auth configuration')
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set_password_config = subparsers.add_parser(
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'set-password-config', help='Set SSH password auth configuration')
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set_password_config.add_argument('--value')
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subparsers.required = True
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return parser.parse_args()
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def subcommand_setup(arguments):
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"""Setup Open SSH server.
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Regenerates deleted SSH keys. This is necessary when FreedomBox image is
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being used. During the image building process the SSH keys are removed and
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start OpenSSH server fails without the keys.
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If the keys already exist, do nothing. This is necessary when a user
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installs FreedomBox using an apt package. SSH keys exist and running
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reconfigure on the openssh-server package does not regenerate them.
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"""
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action_utils.dpkg_reconfigure('openssh-server', {})
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def get_user_homedir(username):
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"""Return the home dir of a user by looking up in password database."""
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try:
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return pwd.getpwnam(username).pw_dir
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except KeyError:
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print('Username not found')
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sys.exit(1)
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def subcommand_get_keys(arguments):
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"""Get SSH authorized keys."""
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user = arguments.username
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path = os.path.join(get_user_homedir(user), '.ssh', 'authorized_keys')
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try:
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with open(path, 'r') as file_handle:
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print(file_handle.read())
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except FileNotFoundError:
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pass
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def subcommand_set_keys(arguments):
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"""Set SSH authorized keys."""
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user = arguments.username
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ssh_folder = os.path.join(get_user_homedir(user), '.ssh')
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key_file_path = os.path.join(ssh_folder, 'authorized_keys')
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subprocess.check_call(['mkhomedir_helper', user])
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if not os.path.exists(ssh_folder):
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os.makedirs(ssh_folder)
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shutil.chown(ssh_folder, user, 'users')
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with open(key_file_path, 'w') as file_handle:
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file_handle.write(arguments.keys)
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shutil.chown(key_file_path, user, 'users')
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os.chmod(key_file_path, stat.S_IRUSR | stat.S_IWUSR)
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def _load_augeas():
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"""Initialize augeas for this app's configuration file."""
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aug = augeas.Augeas(flags=augeas.Augeas.NO_LOAD +
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augeas.Augeas.NO_MODL_AUTOLOAD)
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aug.set('/augeas/load/Sshd/lens', 'Sshd.lns')
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aug.set('/augeas/load/Sshd/incl[last() + 1]', '/etc/ssh/sshd_config')
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aug.load()
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return aug
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def subcommand_get_password_config(_):
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"""Retrieve value of password authentication from sshd configuration."""
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aug = _load_augeas()
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field_path = '/files/etc/ssh/sshd_config/PasswordAuthentication'
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get_value = aug.get(field_path)
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print(get_value or 'yes')
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def subcommand_set_password_config(arguments):
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"""Set value of password authentication in sshd configuration."""
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aug = _load_augeas()
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aug.set('/files/etc/ssh/sshd_config/PasswordAuthentication',
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arguments.value)
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aug.save()
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def main():
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"""Parse arguments and perform all duties."""
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arguments = parse_arguments()
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subcommand = arguments.subcommand.replace('-', '_')
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subcommand_method = globals()['subcommand_' + subcommand]
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subcommand_method(arguments)
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if __name__ == '__main__':
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main()
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