736 lines
32 KiB
Python
736 lines
32 KiB
Python
#!/usr/bin/python3
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"""Serve the status of the router on its internal address.
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Run by vpn-router-web.service. Users are managed with vpnrouter_users, the module that
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vpn-router-user uses too.
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Pages:
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/ the status for people: plain text for curl and wget, a styled page
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(Tailwind CSS from a CDN) for a browser
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/status the status as JSON
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/config the configuration without its secrets, and what the router resolved and
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runs, as JSON
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/users the users in the router's directory, whether or not a P2S system is enabled: list,
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add, change, set the password, disable, enable, remove, the OpenVPN client
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profile, and TOTP enrolment (see users())
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/groups the groups of the router's directory: list, add, rename or describe, remove, and
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add and take out members (see groups())
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/auth sign-in with a user's password and TOTP code, refresh and sign-out (see auth())
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/config, /users and /groups need an HS256 JWT in an Authorization: Bearer header signed with
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vpnrouter_auth.WEB_KEY (see vpnrouter_auth.verify). A token of /auth names a user in sub, who
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must be a member of vpnrouter_users.ADMIN_GROUP; a token of vpn-router-token has the admin
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claim, and only such a token may change ADMIN_GROUP: create, rename to it, change, remove it,
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add or take out its members, and remove one of its members. These paths and /auth are not
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served (404) while the key does not exist. /auth is limited to AUTH_LIMIT calls per client
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address in AUTH_WINDOW seconds; the address of a call from one of web.trusted_proxies, by
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default the address the service listens on, is the last entry of its X-Forwarded-For header.
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/ and /status show only the status: whether the services run, the package version, whether
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Docker is installed, and the state of site-to-site, road-warrior (IPsec P2S), OpenVPN and
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WireGuard. No configuration data, key or address is shown.
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The service first initializes, without listening: it makes the signing key and the refresh
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tokens' database (vpnrouter_auth), retrying every INIT_RETRY_SECONDS until both are ready and
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logging each failure. Then it listens. Its unit starts it only once wait-for-libpq has found libpq
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in the linker cache, where psycopg looks it up.
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The service needs nothing else to start and does not end on its own. Every DISCOVERY_SECONDS it
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works out the internal address from /etc/vpn-router/vpn-router.json as general.mode directs,
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with web.port and web.enabled (vpnrouter_net.web_listen), and runs the server there
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(vpnrouter_serve.serve): it starts it, moves it when the address or the port changes, and stops
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it while the service is disabled or the address is not known. Every request reads what it needs when it is made: the signing
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key, the configuration, and the features of the router and the facts shown by /config from
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/run/vpn-router/web.json, which vpn-router-setup writes. Before setup has written that file
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the router has no features, and /config shows no configuration or interfaces.
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"""
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import collections
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import json
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import os
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import signal
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import subprocess
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import sys
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import threading
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import time
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from html import escape
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from http.server import BaseHTTPRequestHandler
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sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)))
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import ldap
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import vpnrouter
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import vpnrouter_auth
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import vpnrouter_net
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import vpnrouter_serve
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import vpnrouter_users
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STATE_FILE = '/run/vpn-router/web.json'
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CONFIG_FILE = '/etc/vpn-router/vpn-router.json'
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#: Seconds between two attempts of the initialization.
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INIT_RETRY_SECONDS = 15
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#: The port when web.port is not set.
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DEFAULT_PORT = 7081
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#: Seconds between two discoveries of where the service should listen.
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DISCOVERY_SECONDS = 30
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COMMAND_TIMEOUT = 5
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CACHE_SECONDS = 2
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#: The calls of /auth allowed per client address in AUTH_WINDOW seconds.
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AUTH_LIMIT = 10
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AUTH_WINDOW = 60
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TAILWIND = 'https://cdn.jsdelivr.net/npm/@tailwindcss/browser@4'
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#: Seconds after which the status page in a browser reloads itself.
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REFRESH_SECONDS = 60
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OPENVPN_STATUS = '/run/openvpn-server/status-vpn-router.log'
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#: The largest request body accepted, in bytes.
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BODY_LIMIT = 4096
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#: The HTTP status for each status of a vpnrouter_users.Failure; any other is 500.
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USER_STATUS = {2: 400, 3: 404, 4: 409, 5: 401}
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_cache = {'at': 0.0, 'data': None}
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_lock = threading.Lock()
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#: The times of the recent /auth calls of each client address.
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_auth_calls = collections.defaultdict(collections.deque)
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_auth_lock = threading.Lock()
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def read_json(path):
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"""The object in a JSON file, or {} when the file is missing or holds no object."""
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try:
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with open(path, encoding='utf-8') as handle:
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data = json.load(handle)
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except (OSError, ValueError):
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return {}
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return data if isinstance(data, dict) else {}
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def section(configuration, name):
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"""A section of the configuration, or {} when it is missing or not an object."""
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value = configuration.get(name)
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return value if isinstance(value, dict) else {}
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def current():
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"""What a request needs, read now: the features and facts setup resolved, and the signing key.
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Before setup has run the router has no features, and without a key the protected paths and
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/auth are not served.
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"""
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return dict(read_json(STATE_FILE), key=vpnrouter_auth.key())
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def run(*args):
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"""The finished process of a command, or None when it cannot be run."""
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try:
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return subprocess.run(args, capture_output=True, text=True, timeout=COMMAND_TIMEOUT)
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except (OSError, subprocess.TimeoutExpired):
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return None
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def unit_state(unit):
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result = run('systemctl', 'is-active', unit)
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return result.stdout.strip() if result and result.stdout.strip() else 'unknown'
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def package_version():
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result = run('dpkg-query', '-W', '-f=${Version}', 'vpn-router')
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return result.stdout.strip() if result and result.returncode == 0 else None
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def docker_status():
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"""Whether Docker is installed, and the state of its service and of the Docker rules when it is."""
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result = run('systemctl', 'list-unit-files', '--no-legend', 'docker.service')
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if result is None or result.returncode != 0 or not result.stdout.strip():
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return {'installed': False}
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return {
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'installed': True,
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'service': unit_state('docker.service'),
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'rules': unit_state('vpn-router-docker.service'),
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}
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def swanctl(command):
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"""The entries of a swanctl list command, or None when swanctl cannot be asked.
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The --pretty output has one item per line: "name {" opens a section, "key = [" a list
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whose items follow one per line, "}" and "]" close them, and "key = value" is a pair
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whose value may contain spaces. Every "... event {" section at the top holds one
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connection or SA; each becomes an entry with its name under "name". The closing
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"... reply {" section is left out. Values stay strings, as swanctl prints them.
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Output with more closing than opening lines gives None.
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"""
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result = run('swanctl', command, '--pretty')
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if result is None or result.returncode != 0:
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return None
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events = []
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stack = []
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for line in result.stdout.splitlines():
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line = line.strip()
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if not line:
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continue
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if line in ('}', ']'):
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if not stack:
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return None
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stack.pop()
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elif not stack:
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section = {}
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if line.endswith(' event {'):
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events.append(section)
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stack.append(section)
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elif isinstance(stack[-1], list):
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stack[-1].append(line)
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elif line.endswith(' {'):
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stack[-1][line[:-2]] = section = {}
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stack.append(section)
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elif line.endswith(' = ['):
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stack[-1][line[:-4]] = items = []
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stack.append(items)
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else:
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key, _, value = line.partition(' = ')
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stack[-1][key] = value
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return [dict(body, name=name) for event in events for name, body in event.items()]
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def established(connection):
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"""The number of established IKE SAs of the connection, or None when swanctl cannot be asked."""
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sas = swanctl('--list-sas')
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if sas is None:
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return None
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return sum(1 for sa in sas if sa['name'] == connection and sa.get('state') == 'ESTABLISHED')
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def wireguard_peers():
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"""One entry per WireGuard peer, with its handshake age and traffic, or None when wg0 is down."""
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result = run('wg', 'show', 'wg0', 'dump')
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if result is None or result.returncode != 0:
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return None
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now = int(time.time())
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peers = []
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for line in result.stdout.splitlines()[1:]:
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fields = line.split('\t')
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if len(fields) < 7:
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continue
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handshake = int(fields[4])
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peers.append({
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'handshake_seconds_ago': now - handshake if handshake else None,
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'received_bytes': int(fields[5]),
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'sent_bytes': int(fields[6]),
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})
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return peers
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def openvpn_clients():
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"""The number of connected OpenVPN clients, from the server's status file, or None when it cannot be read."""
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try:
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with open(OPENVPN_STATUS, encoding='utf-8') as handle:
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return sum(1 for line in handle if line.startswith('CLIENT_LIST,'))
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except OSError:
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return None
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def collect(state):
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"""The status document. state says which features the router has."""
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units = {'vpn-router-setup': unit_state('vpn-router-setup.service'), 'slapd': unit_state('slapd.service')}
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if state.get('site_to_site') or state.get('p2s'):
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units['strongswan'] = unit_state('strongswan.service')
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if state.get('wireguard'):
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units['wg-quick@wg0'] = unit_state('wg-quick@wg0.service')
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if state.get('openvpn'):
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units['openvpn-server@vpn-router'] = unit_state('openvpn-server@vpn-router.service')
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status = {
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'status': 'ok' if all(value == 'active' for value in units.values()) else 'degraded',
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'version': package_version(),
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'time': time.strftime('%Y-%m-%dT%H:%M:%S%z'),
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'units': units,
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'docker': docker_status(),
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}
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if state.get('site_to_site'):
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count = established('remote-site')
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status['site_to_site'] = {'established': None if count is None else count > 0}
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if state.get('p2s'):
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status['p2s'] = {'clients': established('road-warrior')}
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if state.get('wireguard'):
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status['wireguard'] = {'peers': wireguard_peers()}
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if state.get('openvpn'):
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status['openvpn'] = {'clients': openvpn_clients()}
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return status
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def lines_of(*args):
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"""The output lines of a command, or None when it fails."""
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result = run(*args)
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return result.stdout.splitlines() if result and result.returncode == 0 else None
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def routes():
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"""The IPv4 routes as ip -j prints them, or None when ip fails."""
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result = run('ip', '-j', '-4', 'route', 'show')
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if result is None or result.returncode != 0:
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return None
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try:
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return json.loads(result.stdout)
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except ValueError:
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return None
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def wireguard_details():
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"""The interface and the peers of wg0, with endpoints and allowed IPs; no private or preshared key."""
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result = run('wg', 'show', 'wg0', 'dump')
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if result is None or result.returncode != 0:
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return None
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rows = [line.split('\t') for line in result.stdout.splitlines()]
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now = int(time.time())
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return {
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'public_key': rows[0][1] if rows and len(rows[0]) > 2 else None,
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'listen_port': int(rows[0][2]) if rows and len(rows[0]) > 2 else None,
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'peers': [{
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'public_key': row[0],
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'endpoint': None if row[2] == '(none)' else row[2],
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'allowed_ips': row[3].split(','),
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'handshake_seconds_ago': now - int(row[4]) if int(row[4]) else None,
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'received_bytes': int(row[5]),
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'sent_bytes': int(row[6]),
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} for row in rows[1:] if len(row) >= 7],
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}
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def details(state):
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"""What /config shows: the configuration without its secrets, and what the router resolved and runs."""
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configuration = state.get('configuration', {})
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return {
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'configuration': configuration,
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'network': dict(state.get('network', {}), routes=routes()),
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'ipsec': {
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'connections': swanctl('--list-conns'),
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'sas': swanctl('--list-sas'),
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},
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'wireguard': wireguard_details(),
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'docker': {
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'exposed_ports': configuration.get('docker', {}).get('exposed_ports', []),
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'rules': lines_of('iptables', '-S', 'VPN-ROUTER-DOCKER'),
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},
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}
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def text_of(status):
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"""The status for people, as plain text."""
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lines = ['VPN Router', f'Status: {status["status"]}', f'Version: {status["version"] or "unknown"}', '']
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lines += [f'{name}: {value}' for name, value in status['units'].items()]
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docker = status['docker']
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lines.append('Docker: not installed' if not docker['installed']
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else f'Docker: installed, service {docker["service"]}, rules {docker["rules"]}')
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if 'site_to_site' in status:
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value = status['site_to_site']['established']
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lines.append(f'Site to site: {"unknown" if value is None else "established" if value else "not established"}')
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if 'p2s' in status:
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clients = status['p2s']['clients']
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lines.append(f'Road-warrior (IPsec P2S): {"unknown" if clients is None else f"{clients} connected"}')
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if 'openvpn' in status:
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clients = status['openvpn']['clients']
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lines.append(f'OpenVPN: {"unknown" if clients is None else f"{clients} connected"}')
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if 'wireguard' in status:
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peers = status['wireguard']['peers']
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if peers is None:
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lines.append('WireGuard: down')
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else:
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lines.append(f'WireGuard: {len(peers)} peers')
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for number, peer in enumerate(peers, 1):
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age = peer['handshake_seconds_ago']
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lines.append(f' peer {number}: {"no handshake yet" if age is None else f"handshake {age} s ago"}, '
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f'received {peer["received_bytes"]} B, sent {peer["sent_bytes"]} B')
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return '\n'.join(lines) + '\n'
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def html_of(status):
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"""The status for a browser, as a page styled with Tailwind CSS."""
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colour = 'bg-emerald-600 dark:bg-emerald-700' if status['status'] == 'ok' else 'bg-amber-600 dark:bg-amber-700'
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# Each "name: value" line of the text is a row; indented lines, such as WireGuard peers, are indented here too.
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rows = []
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for line in text_of(status).splitlines()[4:]:
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if not line:
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continue
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name, _, value = line.partition(': ')
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indent = ' pl-8' if line.startswith(' ') else ''
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rows.append(f'<tr class="border-t border-slate-200 first:border-t-0 dark:border-slate-700">'
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f'<th class="py-2 pr-4{indent} text-left font-medium text-slate-600 dark:text-slate-300">{escape(name.strip())}</th>'
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f'<td class="py-2">{escape(value)}</td></tr>')
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body = ''.join(rows)
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return f"""<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="color-scheme" content="light dark">
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<meta http-equiv="refresh" content="{REFRESH_SECONDS}">
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<title>VPN Router</title>
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<script src="{TAILWIND}"></script>
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</head>
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<body class="min-h-screen bg-slate-100 text-slate-900 dark:bg-slate-900 dark:text-slate-100">
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<div class="mx-auto max-w-2xl px-4 py-10">
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<div class="overflow-hidden rounded-2xl border border-slate-200 bg-white shadow-lg dark:border-slate-700 dark:bg-slate-800">
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<div class="{colour} px-6 py-4 text-white">
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<h1 class="text-xl font-semibold">VPN Router</h1>
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<p class="mt-1 text-sm">Status: {escape(status['status'])}, version {escape(status['version'] or 'unknown')}</p>
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</div>
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<div class="px-6 py-4">
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<table class="w-full text-sm"><tbody>{body}</tbody></table>
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</div>
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<p class="px-6 pb-6 text-xs text-slate-500 dark:text-slate-400">{escape(status['time'])} - <a class="underline" href="/status">JSON</a></p>
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</div>
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</div>
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</body>
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</html>
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"""
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def users(state, method, path, body):
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"""Answer a /users request with vpnrouter_users: the HTTP status and the JSON document.
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GET /users the users
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POST /users add a user: {"name", "password", "first_name", "last_name", "email"}
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PUT /users/<name> change any of {"first_name", "last_name", "email"}
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PUT /users/<name>/password set the password: {"password": ...}
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POST /users/<name>/disable lock the user out of OpenVPN
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POST /users/<name>/enable let the user in again
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POST /users/<name>/unlock end a lockout after failed logins
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DELETE /users/<name> remove the user and revoke the certificate
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GET /users/<name>/profile the OpenVPN client profile
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POST /users/<name>/otp a new TOTP secret and its otpauth URI; nothing is stored
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PUT /users/<name>/otp store a TOTP secret: {"secret", "code"}, code a code of the secret
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DELETE /users/<name>/otp remove the TOTP token
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"""
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if body == 'invalid' or (body is not None and not isinstance(body, dict)):
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return 400, {'error': 'the body must be a JSON object'}
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body = body or {}
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parts = path.strip('/').split('/')
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route = (method, len(parts), parts[2] if len(parts) == 3 else None)
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name = parts[1] if len(parts) > 1 else None
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actions = {
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('GET', 1, None): lambda connection: vpnrouter_users.list_users(connection),
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('POST', 1, None): lambda connection: vpnrouter_users.add(connection, body.get('name'), body.get('password'), body),
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('PUT', 2, None): lambda connection: vpnrouter_users.update(connection, name, body),
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('PUT', 3, 'password'): lambda connection: vpnrouter_users.passwd(connection, name, body.get('password')),
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('POST', 3, 'disable'): lambda connection: vpnrouter_users.disable(connection, name),
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('POST', 3, 'enable'): lambda connection: vpnrouter_users.enable(connection, name),
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('POST', 3, 'unlock'): lambda connection: vpnrouter_users.unlock(connection, name),
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('DELETE', 2, None): lambda connection: vpnrouter_users.remove(connection, name),
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('GET', 3, 'profile'): lambda connection: vpnrouter_users.profile(connection, name),
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('POST', 3, 'otp'): lambda connection: vpnrouter_users.otp_new(connection, name),
|
|
('PUT', 3, 'otp'): lambda connection: vpnrouter_users.otp_enrol(connection, name, body.get('secret'), body.get('code')),
|
|
('DELETE', 3, 'otp'): lambda connection: vpnrouter_users.otp_remove(connection, name),
|
|
}
|
|
if route not in actions:
|
|
return 404, {'error': f'no route {method} {path}'}
|
|
try:
|
|
with vpnrouter_users.session() as connection:
|
|
document = actions[route](connection)
|
|
except vpnrouter_users.Failure as failure:
|
|
return USER_STATUS.get(failure.status, 500), {'error': str(failure)}
|
|
except (ldap.LDAPError, OSError) as exc:
|
|
return 500, {'error': f'the user directory failed: {exc}'}
|
|
except vpnrouter_auth.DatabaseError as exc:
|
|
return 500, {'error': str(exc)}
|
|
except SystemExit as exc:
|
|
# vpnrouter ends with SystemExit, carrying the reason, on a configuration it cannot read.
|
|
return 500, {'error': str(exc.code)}
|
|
return (201 if route == ('POST', 1, None) else 200), document
|
|
|
|
|
|
def groups(state, method, path, body):
|
|
"""Answer a /groups request with vpnrouter_users: the HTTP status and the JSON document.
|
|
|
|
GET /groups the groups with their members
|
|
POST /groups add a group: {"name", "members": [...], "description"?}
|
|
PUT /groups/<name> rename it or change the description: {"name"?, "description"?}
|
|
DELETE /groups/<name> remove the group; its members are kept
|
|
POST /groups/<name>/members add a member: {"user": ...}
|
|
DELETE /groups/<name>/members/<user> take a member out; the last member cannot leave
|
|
"""
|
|
if body == 'invalid' or (body is not None and not isinstance(body, dict)):
|
|
return 400, {'error': 'the body must be a JSON object'}
|
|
body = body or {}
|
|
parts = path.strip('/').split('/')
|
|
name = parts[1] if len(parts) > 1 else None
|
|
route = (method, len(parts), parts[2] if len(parts) > 2 else None)
|
|
actions = {
|
|
('GET', 1, None): lambda connection: vpnrouter_users.list_groups(connection),
|
|
('POST', 1, None): lambda connection: vpnrouter_users.group_add(
|
|
connection, body.get('name'), body.get('description'), body.get('members')),
|
|
('PUT', 2, None): lambda connection: vpnrouter_users.group_update(
|
|
connection, name, body.get('name'), body.get('description')),
|
|
('DELETE', 2, None): lambda connection: vpnrouter_users.group_remove(connection, name),
|
|
('POST', 3, 'members'): lambda connection: vpnrouter_users.group_member_add(connection, name, body.get('user')),
|
|
('DELETE', 4, 'members'): lambda connection: vpnrouter_users.group_member_remove(connection, name, parts[3]),
|
|
}
|
|
if route not in actions:
|
|
return 404, {'error': f'no route {method} {path}'}
|
|
try:
|
|
with vpnrouter_users.session() as connection:
|
|
document = actions[route](connection)
|
|
except vpnrouter_users.Failure as failure:
|
|
return USER_STATUS.get(failure.status, 500), {'error': str(failure)}
|
|
except (ldap.LDAPError, OSError) as exc:
|
|
return 500, {'error': f'the user directory failed: {exc}'}
|
|
return (201 if route == ('POST', 1, None) else 200), document
|
|
|
|
|
|
def changes_admins(connection, method, parts, body):
|
|
"""Whether a /users or /groups request creates, renames to, changes or removes ADMIN_GROUP, or removes a member of it."""
|
|
admins = vpnrouter_users.ADMIN_GROUP
|
|
if parts[0] == 'groups':
|
|
if method == 'POST' and len(parts) == 1:
|
|
return body.get('name') == admins
|
|
if method != 'GET' and len(parts) > 1 and parts[1] == admins:
|
|
return True
|
|
return method == 'PUT' and len(parts) == 2 and body.get('name') == admins
|
|
if parts[0] == 'users' and method == 'DELETE' and len(parts) == 2:
|
|
return admins in vpnrouter_users.groups_of(connection, parts[1])
|
|
return False
|
|
|
|
|
|
def refusal(claims, method, path, body):
|
|
"""Why the holder of the claims may not make the request to a protected path, or '' when it may."""
|
|
if claims.get('admin') is True:
|
|
return ''
|
|
name = claims.get('sub')
|
|
if not isinstance(name, str):
|
|
return 'the token names no user'
|
|
admins = vpnrouter_users.ADMIN_GROUP
|
|
with vpnrouter_users.session() as connection:
|
|
if not vpnrouter_users.is_admin(connection, name):
|
|
return f'user {name} is not a member of {admins}'
|
|
if changes_admins(connection, method, path.strip('/').split('/'), body if isinstance(body, dict) else {}):
|
|
return f'only a token of vpn-router-token may change the group {admins} or remove its members'
|
|
return ''
|
|
|
|
|
|
def auth(path, body):
|
|
"""Answer a POST to /auth with vpnrouter_users and vpnrouter_auth: the HTTP status and the JSON document.
|
|
|
|
POST /auth sign in: {"name", "password", "code"?}; the tokens
|
|
POST /auth/refresh {"refresh_token"}; new tokens, the refresh token used up
|
|
POST /auth/logout {"refresh_token"}; the refresh token revoked
|
|
"""
|
|
if not isinstance(body, dict):
|
|
return 400, {'error': 'the body must be a JSON object'}
|
|
try:
|
|
cfg = vpnrouter.load_config()
|
|
if path == '/auth':
|
|
vpnrouter_users.login(body.get('name'), body.get('password'), body.get('code'))
|
|
return 200, vpnrouter_auth.issue(cfg, body['name'])
|
|
name = vpnrouter_auth.take(cfg, body.get('refresh_token'))
|
|
if path == '/auth/logout':
|
|
return 200, {'revoked': name is not None}
|
|
if name is None:
|
|
return 401, {'error': 'the refresh token is not valid'}
|
|
with vpnrouter_users.session() as connection:
|
|
user = vpnrouter_users.summary(vpnrouter_users.entry(connection, name))
|
|
if not user['enabled'] or user['locked']:
|
|
return 401, {'error': f'user {name} is disabled or locked'}
|
|
return 200, vpnrouter_auth.issue(cfg, name)
|
|
except vpnrouter_users.Failure as failure:
|
|
return (401 if failure.status == 3 else USER_STATUS.get(failure.status, 500)), {'error': str(failure)}
|
|
except (ldap.LDAPError, OSError) as exc:
|
|
return 500, {'error': f'the user directory failed: {exc}'}
|
|
except vpnrouter_auth.DatabaseError as exc:
|
|
return 500, {'error': str(exc)}
|
|
except SystemExit as exc:
|
|
return 500, {'error': str(exc.code)}
|
|
|
|
|
|
def auth_wait(address):
|
|
"""Seconds until the client address may call /auth again, 0 when it may now; a call that may is counted."""
|
|
now = time.monotonic()
|
|
with _auth_lock:
|
|
for idle in [key for key, times in _auth_calls.items() if times[-1] <= now - AUTH_WINDOW]:
|
|
del _auth_calls[idle]
|
|
calls = _auth_calls[address]
|
|
while calls and calls[0] <= now - AUTH_WINDOW:
|
|
calls.popleft()
|
|
if len(calls) >= AUTH_LIMIT:
|
|
return int(calls[0] + AUTH_WINDOW - now) + 1
|
|
calls.append(now)
|
|
return 0
|
|
|
|
|
|
class Handler(BaseHTTPRequestHandler):
|
|
protocol_version = 'HTTP/1.1'
|
|
|
|
def status(self):
|
|
with _lock:
|
|
if _cache['data'] is None or time.monotonic() - _cache['at'] > CACHE_SECONDS:
|
|
_cache['data'] = collect(current())
|
|
_cache['at'] = time.monotonic()
|
|
return _cache['data']
|
|
|
|
def claims(self, secret):
|
|
"""The claims of the request's token signed with the secret, or None without an acceptable one."""
|
|
header = self.headers.get('Authorization', '')
|
|
return vpnrouter_auth.verify(header[7:].strip(), secret) if header.startswith('Bearer ') else None
|
|
|
|
def client(self):
|
|
"""The client address: the last X-Forwarded-For entry when the peer is a trusted proxy, else the peer."""
|
|
peer = self.client_address[0]
|
|
trusted = section(read_json(CONFIG_FILE), 'web').get('trusted_proxies') or [self.server.server_address[0]]
|
|
forwarded = self.headers.get('X-Forwarded-For', '')
|
|
if isinstance(trusted, list) and peer in trusted and forwarded.strip():
|
|
return forwarded.split(',')[-1].strip()
|
|
return peer
|
|
|
|
def refusal(self, claims, path, payload):
|
|
"""The HTTP status and the message that refuse a request to a protected path, or None when it may be made."""
|
|
try:
|
|
reason = refusal(claims, self.command, path, payload)
|
|
except (ldap.LDAPError, OSError) as exc:
|
|
return 500, f'the user directory failed: {exc}'
|
|
return (403, reason) if reason else None
|
|
|
|
def answer(self, send_body):
|
|
path = self.path.split('?', 1)[0]
|
|
extra = []
|
|
self.principal = None
|
|
# A body that is not read must not be taken for the next request.
|
|
if self.command not in ('GET', 'HEAD'):
|
|
self.close_connection = True
|
|
directory = next((name for name in ('users', 'groups') if path == f'/{name}' or path.startswith(f'/{name}/')), None)
|
|
protected = path == '/config' or directory is not None
|
|
signing = path in ('/auth', '/auth/refresh', '/auth/logout')
|
|
state = current() if protected or signing else {}
|
|
claims = self.claims(state['key']) if protected and state['key'] else None
|
|
payload = self.request_body() if (protected or signing) and self.command not in ('GET', 'HEAD') else None
|
|
if claims is not None:
|
|
self.principal = 'admin' if claims.get('admin') is True else claims.get('sub')
|
|
if (protected or signing) and not state['key']:
|
|
body, kind, code = b'Not found\n', 'text/plain; charset=utf-8', 404
|
|
elif signing and self.command != 'POST':
|
|
body, kind, code = b'Method not allowed\n', 'text/plain; charset=utf-8', 405
|
|
elif signing:
|
|
wait = auth_wait(self.client()) if path != '/auth/logout' else 0
|
|
if wait:
|
|
code, document = 429, {'error': f'too many sign-in calls; retry in {wait} seconds'}
|
|
extra.append(('Retry-After', str(wait)))
|
|
else:
|
|
code, document = auth(path, payload)
|
|
body, kind = json.dumps(document, indent=2).encode() + b'\n', 'application/json'
|
|
elif protected and claims is None:
|
|
body, kind, code = b'Unauthorized\n', 'text/plain; charset=utf-8', 401
|
|
extra.append(('WWW-Authenticate', 'Bearer'))
|
|
elif protected and (refused := self.refusal(claims, path, payload)):
|
|
code, kind = refused[0], 'application/json'
|
|
body = json.dumps({'error': refused[1]}, indent=2).encode() + b'\n'
|
|
elif path == '/config' and self.command in ('GET', 'HEAD'):
|
|
body, kind, code = json.dumps(details(state), indent=2).encode() + b'\n', 'application/json', 200
|
|
elif protected and path != '/config':
|
|
code, document = (users if directory == 'users' else groups)(state, self.command, path, payload)
|
|
body, kind = json.dumps(document, indent=2).encode() + b'\n', 'application/json'
|
|
elif self.command not in ('GET', 'HEAD'):
|
|
body, kind, code = b'Method not allowed\n', 'text/plain; charset=utf-8', 405
|
|
elif path == '/status':
|
|
body, kind, code = json.dumps(self.status(), indent=2).encode() + b'\n', 'application/json', 200
|
|
elif path == '/':
|
|
agent = self.headers.get('User-Agent', '').lower()
|
|
if 'curl' in agent or 'wget' in agent:
|
|
body, kind = text_of(self.status()).encode(), 'text/plain; charset=utf-8'
|
|
else:
|
|
body, kind = html_of(self.status()).encode(), 'text/html; charset=utf-8'
|
|
code = 200
|
|
else:
|
|
body, kind, code = b'Not found\n', 'text/plain; charset=utf-8', 404
|
|
self.send_response(code)
|
|
self.send_header('Content-Type', kind)
|
|
self.send_header('Content-Length', str(len(body)))
|
|
self.send_header('Cache-Control', 'no-store')
|
|
for name, value in extra:
|
|
self.send_header(name, value)
|
|
self.end_headers()
|
|
if send_body:
|
|
self.wfile.write(body)
|
|
|
|
def request_body(self):
|
|
"""The request body as JSON, None when there is none, or the string 'invalid'."""
|
|
length = self.headers.get('Content-Length')
|
|
if not length:
|
|
return None
|
|
try:
|
|
size = int(length)
|
|
if not 0 <= size <= BODY_LIMIT:
|
|
return 'invalid'
|
|
return json.loads(self.rfile.read(size) or b'null')
|
|
except ValueError:
|
|
return 'invalid'
|
|
|
|
def do_GET(self):
|
|
self.answer(True)
|
|
|
|
def do_HEAD(self):
|
|
self.answer(False)
|
|
|
|
def do_POST(self):
|
|
self.answer(True)
|
|
|
|
def do_PUT(self):
|
|
self.answer(True)
|
|
|
|
def do_DELETE(self):
|
|
self.answer(True)
|
|
|
|
def log_message(self, format, *args):
|
|
principal = getattr(self, 'principal', None) or '-'
|
|
sys.stderr.write('%s - %s [%s] %s\n' % (self.client_address[0], principal, self.log_date_time_string(), format % args))
|
|
|
|
|
|
def log(message):
|
|
print(f'vpn-router-web: {message}', file=sys.stderr, flush=True)
|
|
|
|
|
|
def initialize():
|
|
"""Make the signing key and the refresh tokens' database, retrying every INIT_RETRY_SECONDS until both are ready."""
|
|
reported = None
|
|
while True:
|
|
phase = 'reading the configuration'
|
|
try:
|
|
cfg = vpnrouter.load_config()
|
|
phase = 'making the signing key'
|
|
vpnrouter_auth.ensure_key()
|
|
phase = 'creating the token database'
|
|
vpnrouter_auth.provision(cfg)
|
|
phase = 'connecting to the token database'
|
|
with vpnrouter_auth.database(cfg):
|
|
pass
|
|
except (OSError, SystemExit, vpnrouter_auth.DatabaseError) as exc:
|
|
error = f'{phase} failed: {exc.code if isinstance(exc, SystemExit) else exc}'
|
|
if error != reported:
|
|
log(f'{error}; retrying every {INIT_RETRY_SECONDS} seconds')
|
|
reported = error
|
|
time.sleep(INIT_RETRY_SECONDS)
|
|
continue
|
|
log('ready')
|
|
return
|
|
|
|
|
|
def main():
|
|
signal.signal(signal.SIGTERM, lambda *_: sys.exit(0))
|
|
initialize()
|
|
try:
|
|
vpnrouter_serve.serve(lambda: vpnrouter_net.web_listen(read_json(CONFIG_FILE), DEFAULT_PORT), Handler, log,
|
|
DISCOVERY_SECONDS)
|
|
except KeyboardInterrupt:
|
|
pass
|
|
return 0
|
|
|
|
|
|
if __name__ == '__main__':
|
|
sys.exit(main())
|