227 lines
8.7 KiB
Python
227 lines
8.7 KiB
Python
#!/usr/bin/python3
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import collections
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import email.message
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import getpass
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import multiprocessing
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import os
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import pathlib
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import shutil
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import smtplib
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import socket
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import subprocess
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import sys
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import syslog
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import click
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import flask
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import flask.cli
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import ldap3
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from . import db
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def mail(rcpt, subject, body):
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try:
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msg = email.message.EmailMessage()
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msg['Subject'] = f'friwall: {subject}'
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msg['From'] = f'{getpass.getuser()}@{socket.getfqdn()}'
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msg['To'] = rcpt
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msg.set_content(body)
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with smtplib.SMTP('localhost') as server:
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server.send_message(msg)
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except Exception as e:
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syslog.syslog(f'error sending mail: {e}')
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def init_app(app):
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app.cli.add_command(generate)
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app.cli.add_command(push)
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def run(fun, args=()):
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def task():
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if os.fork() == 0:
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os.setsid()
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fun(*args)
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multiprocessing.Process(target=task).start()
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def save_config():
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output = None
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try:
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# Just load the settings here but keep the database unlocked
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# while we load group memberships from LDAP.
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with db.locked():
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settings = db.read('settings')
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groups = db.read('groups')
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# For each user build a list of networks they have access to, based on
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# group membership in AD. Only query groups associated with at least one
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# network, and query each group only once.
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user_networks = collections.defaultdict(set)
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ldap = ldap3.Connection(ldap3.Server(settings.get('ldap_host'), use_ssl=True),
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settings.get('ldap_user'), settings.get('ldap_pass'), auto_bind=True)
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for group, network in groups.items():
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ldap.search(settings.get('ldap_base_dn', ''),
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f'(distinguishedName={group})', attributes='member')
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if ldap.entries:
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for user in ldap.entries[0]['member']:
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user_networks[user].add(network)
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# Now read the settings again and lock the database while generating
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# config files, then increment version before unlocking.
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with db.locked():
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settings = db.read('settings')
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version = settings['version'] = int(settings.get('version', 0)) + 1
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# Populate IP sets.
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ipsets = collections.defaultdict(set)
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for name, network in db.read('ipsets').items():
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ipsets[name].update(network.get('ip', ()))
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ipsets[f'{name}/6'].update(network.get('ip6', ()))
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# Add registered VPN addresses for each network based on
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# LDAP group membership.
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wireguard = db.read('wireguard')
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for ip, key in wireguard.items():
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for network in user_networks.get(key.get('user', ''), ()):
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ipsets[network].add(f'{ip}/32')
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if 'ip6' in key:
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ipsets[f'{network}/6'].add(f'{key["ip6"]}/128')
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# Create config files.
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output = pathlib.Path.home() / 'config' / f'{version}'
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shutil.rmtree(output, ignore_errors=True)
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os.makedirs(f'{output}/etc/nftables.d', exist_ok=True)
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os.makedirs(f'{output}/etc/wireguard', exist_ok=True)
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# Print version.
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with open(f'{output}/version', 'w', encoding='utf-8') as f:
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print(version, file=f)
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# Print nftables sets.
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with open(f'{output}/etc/nftables.d/sets.nft', 'w', encoding='utf-8') as f:
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def format_set(name, ips):
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return f'''\
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set {name} {{
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type {"ipv6_addr" if name.endswith('/6') else "ipv4_addr"}; flags interval
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{"" if ips else "# "}elements = {{ {", ".join(ips)} }}
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}}'''
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for name, ips in ipsets.items():
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print(format_set(name, ips), file=f)
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# Print static NAT (1:1) rules.
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with open(f'{output}/etc/nftables.d/netmap.nft', 'w', encoding='utf-8') as f:
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def format_map(name, elements):
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lines = ',\n'.join(f'{a}: {b}' for a, b in elements)
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return f'''\
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map {name} {{
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type ipv4_addr : interval ipv4_addr; flags interval
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elements = {{ {lines} }}
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}}
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'''
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netmap = db.read('netmap') # { private range: public range… }
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if netmap:
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print(format_map('netmap-out', ((private, public) for private, public in netmap.items())), file=f)
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print(format_map('netmap-in', ((public, private) for private, public in netmap.items())), file=f)
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# Print dynamic NAT rules.
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with open(f'{output}/etc/nftables.d/nat.nft', 'w', encoding='utf-8') as f:
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nat = db.read('nat') # { network name: public range… }
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for network, address in nat.items():
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if address:
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print(f'iif @inside oif @outside ip saddr @{network} snat to {address}', file=f)
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# Print forwarding rules.
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with open(f'{output}/etc/nftables.d/forward.nft', 'w', encoding='utf-8') as f:
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for index, rule in enumerate(db.read('rules')):
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if rule.get('enabled') and rule.get('text'):
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if 'name' in rule:
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print(f'# {index}. {rule["name"]}', file=f)
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print(rule['text'], file=f)
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print(file=f)
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# Print wireguard config.
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with open(f'{output}/etc/wireguard/wg.conf', 'w', encoding='utf-8') as f:
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print(f'''\
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[Interface]
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ListenPort = {settings.get('wg_port', 51820)}
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PrivateKey = {settings.get('wg_key')}
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''', file=f)
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for ip, data in wireguard.items():
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print(f'''\
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# {data.get('user')}
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[Peer]
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PublicKey = {data.get('key')}
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AllowedIPs = {ip}
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''', file=f)
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# Make a config archive in a temporary place, so we don’t send
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# incomplete tars.
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tar_file = shutil.make_archive(f'{output}-tmp', 'gztar', root_dir=output, owner='root', group='root')
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# Move config archive to the final destination.
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os.rename(tar_file, f'{output}.tar.gz')
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# If we get here, write settings with the new version.
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db.write('settings', settings)
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return True
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except Exception as e:
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import traceback
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e.add_note(f'exception while generating config: {e}')
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msg = traceback.format_exc()
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if rcpt := settings.get('admin_mail'):
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mail(rcpt, 'error generating config', msg)
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# TODO this doesn’t seem to work
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#syslog.syslog(msg)
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return False
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finally:
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# Remove temporary directory.
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if output:
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shutil.rmtree(output, ignore_errors=True)
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@click.command('generate')
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@flask.cli.with_appcontext
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def generate():
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save_config()
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@click.command('push')
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@click.option('--version', '-v', type=click.INT, default=None, help="Config version to push")
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@flask.cli.with_appcontext
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def push(version=None):
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try:
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with db.locked('nodes'):
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if version is None:
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version = db.load('settings').get('version', 0)
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nodes = db.read('nodes')
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tar_file = pathlib.Path.home() / 'config' / f'{version}.tar.gz'
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errors = []
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for node, node_version in nodes.items():
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if node_version != version:
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try:
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# Push config tarfile to node. There sshd runs a forced command that
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# reads in a tarball, copies files to /etc and reloads services.
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syslog.syslog(f'updating config for {node} from v{node_version} to v{version}')
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result = subprocess.run(['/usr/bin/ssh', '-T', '-o', 'ConnectTimeout=10', f'root@{node}'],
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stdin=open(tar_file), capture_output=True, text=True)
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if result.returncode == 0:
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nodes[node] = version
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db.write('nodes', nodes)
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syslog.syslog(f'successfully updated config for {node} to v{version}')
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else:
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raise RuntimeError(f'error updating config to v{version}: {result.stderr}')
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except (FileNotFoundError, RuntimeError) as e:
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e.add_note(f'error while updating node {node}')
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errors.append(e)
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if errors:
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raise ExceptionGroup('errors while updating nodes', errors)
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except Exception as e:
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import traceback
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msg = traceback.format_exc()
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if rcpt := db.load('settings').get('admin_mail'):
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mail(rcpt, 'error updating nodes', msg)
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syslog.syslog(msg)
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