mirror of
https://github.com/freedombox/FreedomBox.git
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506bff5c7b
- Allow setting multiple SSH keys one per line (which is already allowed, but advertise it better). - Use mkhomedir_helper to create the user's home directory. Avoid security and accuracy complexities of creating a home directory. - Allow homes that don't exist in /home.
100 lines
2.8 KiB
Python
Executable File
100 lines
2.8 KiB
Python
Executable File
#!/usr/bin/python3
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#
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# This file is part of Plinth.
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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 re
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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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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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get_keys = subparsers.add_parser('get-keys', 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', 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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return parser.parse_args()
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def _assert_valid_username(username):
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"""Verify that username is a valid one."""
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if not re.match(r'^[a-z][-a-z0-9_]*$', username):
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print('Bad username')
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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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_assert_valid_username(user)
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path = os.path.join(os.path.expanduser('~' + user),
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'.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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_assert_valid_username(user)
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subprocess.check_call(['mkhomedir_helper', user])
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ssh_folder = os.path.join(os.path.expanduser('~' + user), '.ssh')
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key_file_path = os.path.join(ssh_folder, 'authorized_keys')
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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 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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