414 lines
14 KiB
Python
Executable file
414 lines
14 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2018-2021 Markus Blöchl <ususdei@gmail.com>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <https://www.gnu.org/licenses/>.
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"""
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# Introduction
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This is a [qutebrowser][2] [userscript][5] to fill website credentials from a [KeepassXC][1] password database.
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# Installation
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First, you need to enable [KeepassXC-Browser][6] extensions in your KeepassXC config.
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Second, you must make sure to have a working private-public-key-pair in your [GPG keyring][3].
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Third, install the python module `pynacl`.
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Finally, adapt your qutebrowser config.
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You can e.g. add the following lines to your `~/.config/qutebrowser/config.py`
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Remember to replace `ABC1234` with your actual GPG key.
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```python
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config.bind('<Alt-Shift-u>', 'spawn --userscript qute-keepassxc --key ABC1234', mode='insert')
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config.bind('pw', 'spawn --userscript qute-keepassxc --key ABC1234', mode='normal')
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```
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# Usage
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If you are on a webpage with a login form, simply activate one of the configured key-bindings.
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The first time you run this script, KeepassXC will ask you for authentication like with any other browser extension.
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Just provide a name of your choice and accept the request if nothing looks fishy.
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# How it works
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This script will talk to KeepassXC using the native [KeepassXC-Browser protocol][4].
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This script needs to store the key used to associate with your KeepassXC instance somewhere.
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Unlike most browser extensions which only use plain local storage, this one attempts to do so in a safe way
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by storing the key in encrypted form using GPG.
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Therefore you need to have a public-key-pair readily set up.
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GPG might then ask for your private-key password whenever you query the database for login credentials.
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[1]: https://keepassxc.org/
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[2]: https://qutebrowser.org/
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[3]: https://gnupg.org/
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[4]: https://github.com/keepassxreboot/keepassxc-browser/blob/develop/keepassxc-protocol.md
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[5]: https://github.com/qutebrowser/qutebrowser/blob/master/doc/userscripts.asciidoc
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[6]: https://keepassxc.org/docs/KeePassXC_GettingStarted.html#_setup_browser_integration
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"""
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import sys
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import os
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import socket
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import json
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import base64
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import shlex
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import subprocess
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import argparse
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import nacl.utils
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import nacl.public
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def parse_args():
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parser = argparse.ArgumentParser(description="Full passwords from KeepassXC")
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parser.add_argument('url', nargs='?', default=os.environ.get('QUTE_URL'))
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parser.add_argument('--socket', '-s', default='/run/user/{}/org.keepassxc.KeePassXC.BrowserServer'.format(os.getuid()),
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help='Path to KeepassXC browser socket')
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parser.add_argument('--key', '-k', default='alice@example.com',
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help='GPG key to encrypt KeepassXC auth key with')
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parser.add_argument('--insecure', action='store_true',
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help="Do not encrypt auth key")
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parser.add_argument('--dmenu-invocation', '-d', default='rofi -dmenu',
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help='Invocation used to execute a dmenu-provider')
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parser.add_argument('--only-username', action='store_true',
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help='Only insert username')
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parser.add_argument('--only-password', action='store_true',
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help='Only insert password')
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parser.add_argument('--only-otp', action='store_true',
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help='Only insert OTP code')
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return parser.parse_args()
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class KeepassError(Exception):
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def __init__(self, code, desc):
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self.code = code
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self.description = desc
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def __str__(self):
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return f"KeepassXC Error [{self.code}]: {self.description}"
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class KeepassXC:
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""" Wrapper around the KeepassXC socket API """
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def __init__(self, id=None, *, key, socket_path):
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self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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self.id = id
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self.socket_path = socket_path
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self.client_key = nacl.public.PrivateKey.generate()
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self.id_key = nacl.public.PrivateKey.from_seed(key)
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self.cryptobox = None
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def connect(self):
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if not os.path.exists(self.socket_path):
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raise KeepassError(-1, "KeepassXC Browser socket does not exists")
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self.client_id = base64.b64encode(nacl.utils.random(nacl.public.Box.NONCE_SIZE)).decode('utf-8')
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self.sock.connect(self.socket_path)
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self.send_raw_msg(dict(
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action = 'change-public-keys',
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publicKey = base64.b64encode(self.client_key.public_key.encode()).decode('utf-8'),
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nonce = base64.b64encode(nacl.utils.random(nacl.public.Box.NONCE_SIZE)).decode('utf-8'),
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clientID = self.client_id
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))
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resp = self.recv_raw_msg()
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assert resp['action'] == 'change-public-keys'
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assert resp['success'] == 'true'
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assert resp['nonce']
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self.cryptobox = nacl.public.Box(
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self.client_key,
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nacl.public.PublicKey(base64.b64decode(resp['publicKey']))
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)
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def get_databasehash(self):
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self.send_msg(dict(action='get-databasehash'))
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return self.recv_msg()['hash']
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def lock_database(self):
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self.send_msg(dict(action='lock-database'))
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try:
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self.recv_msg()
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except KeepassError as e:
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if e.code == 1:
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return True
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raise
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return False
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def test_associate(self):
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if not self.id:
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return False
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self.send_msg(dict(
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action = 'test-associate',
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id = self.id,
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key = base64.b64encode(self.id_key.public_key.encode()).decode('utf-8')
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))
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return self.recv_msg()['success'] == 'true'
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def associate(self):
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self.send_msg(dict(
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action = 'associate',
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key = base64.b64encode(self.client_key.public_key.encode()).decode('utf-8'),
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idKey = base64.b64encode(self.id_key.public_key.encode()).decode('utf-8')
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))
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resp = self.recv_msg()
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self.id = resp['id']
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def get_logins(self, url):
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self.send_msg(dict(
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action = 'get-logins',
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url = url,
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keys = [{ 'id': self.id, 'key': base64.b64encode(self.id_key.public_key.encode()).decode('utf-8') }]
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))
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return self.recv_msg()['entries']
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def get_totp(self, uuid):
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self.send_msg(dict(
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action = 'get-totp',
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uuid = uuid,
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))
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return self.recv_msg()['totp']
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def send_raw_msg(self, msg):
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self.sock.send( json.dumps(msg).encode('utf-8') )
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def recv_raw_msg(self):
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return json.loads( self.sock.recv(4096).decode('utf-8') )
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def send_msg(self, msg, **extra):
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nonce = nacl.utils.random(nacl.public.Box.NONCE_SIZE)
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self.send_raw_msg(dict(
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action = msg['action'],
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message = base64.b64encode(self.cryptobox.encrypt(json.dumps(msg).encode('utf-8'), nonce).ciphertext).decode('utf-8'),
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nonce = base64.b64encode(nonce).decode('utf-8'),
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clientID = self.client_id,
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**extra
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))
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def recv_msg(self):
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resp = self.recv_raw_msg()
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if 'error' in resp:
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raise KeepassError(resp['errorCode'], resp['error'])
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assert resp['action']
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return json.loads(self.cryptobox.decrypt(base64.b64decode(resp['message']), base64.b64decode(resp['nonce'])).decode('utf-8'))
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class SecretKeyStore:
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def __init__(self, gpgkey):
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self.gpgkey = gpgkey
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if gpgkey is None:
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self.path = os.path.join(os.environ['QUTE_DATA_DIR'], 'keepassxc.key')
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else:
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self.path = os.path.join(os.environ['QUTE_DATA_DIR'], 'keepassxc.key.gpg')
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def load(self):
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"Load existing association key from file"
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if self.gpgkey is None:
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jsondata = open(self.path, 'r').read()
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else:
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jsondata = subprocess.check_output(['gpg', '--decrypt', self.path]).decode('utf-8')
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data = json.loads(jsondata)
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self.id = data['id']
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self.key = base64.b64decode(data['key'])
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def create(self):
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"Create new association key"
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self.key = nacl.utils.random(32)
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self.id = None
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def store(self, id):
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"Store newly created association key in file"
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self.id = id
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jsondata = json.dumps({'id':self.id, 'key':base64.b64encode(self.key).decode('utf-8')})
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if self.gpgkey is None:
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open(self.path, "w").write(jsondata)
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else:
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subprocess.run(['gpg', '--encrypt', '-o', self.path, '-r', self.gpgkey], input=jsondata.encode('utf-8'), check=True)
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def fake_key_raw(text):
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for character in text:
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# Escape all characters by default, space requires special handling
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sequence = '" "' if character == ' ' else '\{}'.format(character)
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qute('fake-key {}'.format(sequence))
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def qute(cmd):
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with open(os.environ['QUTE_FIFO'], 'w') as fifo:
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fifo.write(cmd)
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fifo.write('\n')
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fifo.flush()
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def error(msg):
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print(msg, file=sys.stderr)
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qute('message-error "{}"'.format(msg))
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def connect_to_keepassxc(args):
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assert args.key or args.insecure, "Missing GPG key to use for auth key encryption"
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keystore = SecretKeyStore(args.key)
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if os.path.isfile(keystore.path):
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keystore.load()
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kp = KeepassXC(keystore.id, key=keystore.key, socket_path=args.socket)
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kp.connect()
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if not kp.test_associate():
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error('No KeepassXC association')
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return None
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else:
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keystore.create()
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kp = KeepassXC(key=keystore.key, socket_path=args.socket)
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kp.connect()
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kp.associate()
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if not kp.test_associate():
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error('No KeepassXC association')
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return None
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keystore.store(kp.id)
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return kp
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def make_js_code(username, password):
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return ' '.join("""
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function isVisible(elem) {
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var style = elem.ownerDocument.defaultView.getComputedStyle(elem, null);
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if (style.getPropertyValue("visibility") !== "visible" ||
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style.getPropertyValue("display") === "none" ||
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style.getPropertyValue("opacity") === "0") {
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return false;
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}
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return elem.offsetWidth > 0 && elem.offsetHeight > 0;
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};
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function hasPasswordField(form) {
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var inputs = form.getElementsByTagName("input");
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for (var j = 0; j < inputs.length; j++) {
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var input = inputs[j];
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if (input.type === "password") {
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return true;
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}
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}
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return false;
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};
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function loadData2Form (form) {
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var inputs = form.getElementsByTagName("input");
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for (var j = 0; j < inputs.length; j++) {
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var input = inputs[j];
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if (isVisible(input) && (input.type === "text" || input.type === "email")) {
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input.focus();
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input.value = %s;
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input.dispatchEvent(new Event('input', { 'bubbles': true }));
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input.dispatchEvent(new Event('change', { 'bubbles': true }));
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input.blur();
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}
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if (input.type === "password") {
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input.focus();
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input.value = %s;
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input.dispatchEvent(new Event('input', { 'bubbles': true }));
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input.dispatchEvent(new Event('change', { 'bubbles': true }));
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input.blur();
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}
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}
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};
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function fillFirstForm() {
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var forms = document.getElementsByTagName("form");
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for (i = 0; i < forms.length; i++) {
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if (hasPasswordField(forms[i])) {
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loadData2Form(forms[i]);
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return;
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}
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}
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alert("No Credentials Form found");
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};
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fillFirstForm()
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""".splitlines()) % (json.dumps(username), json.dumps(password))
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def dmenu(items, invocation):
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command = shlex.split(invocation)
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process = subprocess.run(command, input='\n'.join(items)
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.encode('UTF-8'), stdout=subprocess.PIPE)
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return process.stdout.decode('UTF-8').strip()
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def main():
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if 'QUTE_FIFO' not in os.environ:
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print(f"No QUTE_FIFO found - {sys.argv[0]} must be run as a qutebrowser userscript")
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sys.exit(-1)
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try:
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args = parse_args()
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assert args.url, "Missing URL"
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kp = connect_to_keepassxc(args)
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if not kp:
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error('Could not connect to KeepassXC')
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return
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creds = kp.get_logins(args.url)
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if not creds:
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error('No credentials found')
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return
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selection = creds[0]
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if len(creds) > 1:
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login = dmenu(sorted(map(lambda c: c['login'], creds)), args.dmenu_invocation)
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for c in creds:
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if c['login'] == login:
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selection = c
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break
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name, pw = selection['login'], selection['password']
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if args.only_username:
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if name:
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fake_key_raw(name)
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return
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if args.only_password:
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if pw:
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fake_key_raw(pw)
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return
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if args.only_otp:
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otp = kp.get_totp(selection['uuid'])
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if otp:
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fake_key_raw(otp)
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return
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if name and pw:
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qute('jseval -q ' + make_js_code(name, pw))
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except Exception as e:
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error(str(e))
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if __name__ == '__main__':
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main()
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