from ipaddress import ip_network from re import sub from bundlewrap.exceptions import NoSuchNode from bundlewrap.metadata import atomic defaults = { 'apt': { 'packages': { 'wireguard': {}, }, 'repos': { 'backports': { 'install_gpg_key': False, # default debian signing key 'items': { 'deb http://deb.debian.org/debian {os_release}-backports main', }, }, }, }, 'wireguard': { 'privatekey': repo.libs.keys.gen_privkey(repo, f'{node.name} wireguard privatekey'), }, } if node.has_bundle('telegraf'): defaults['telegraf'] = { 'input_plugins': { 'builtin': { 'wireguard': [{}], }, }, 'additional_capabilities': { 'CAP_NET_ADMIN', }, } @metadata_reactor.provides( 'wireguard/peers', ) def peer_psks_and_iface_names(metadata): peers = {} for peer_name in metadata.get('wireguard/peers', {}): peers[peer_name] = { 'iface': sub('[^a-z0-9-_]+', '_', peer_name)[:12], } if node.name < peer_name: peers[peer_name]['psk'] = repo.vault.random_bytes_as_base64_for(f'{node.name} wireguard {peer_name}') else: peers[peer_name]['psk'] = repo.vault.random_bytes_as_base64_for(f'{peer_name} wireguard {node.name}') return { 'wireguard': { 'peers': peers, }, } @metadata_reactor.provides( 'wireguard/peers', ) def peer_pubkeys(metadata): peers = {} for peer_name in metadata.get('wireguard/peers', {}): try: rnode = repo.get_node(peer_name) except NoSuchNode: continue peers[peer_name] = { 'pubkey': repo.libs.keys.get_pubkey_from_privkey( repo, f'{rnode.name} wireguard pubkey', rnode.metadata.get('wireguard/privatekey'), ), } return { 'wireguard': { 'peers': peers, }, } @metadata_reactor.provides( 'wireguard/peers', ) def peer_ips_and_ports(metadata): peers = {} base_port = 51820 for number, peer_name in enumerate(sorted(metadata.get('wireguard/peers', {}).keys())): try: rnode = repo.get_node(peer_name) except NoSuchNode: continue ip_a, ip_b = repo.libs.s2s.get_subnet_for_connection(repo, *sorted({node.name, peer_name})) if peer_name < node.name: my_ip = ip_a their_ip = ip_b else: my_ip = ip_b their_ip = ip_a peers[rnode.name] = { 'my_ip': str(my_ip), 'my_port': base_port + number, 'their_ip': str(their_ip) } return { 'wireguard': { 'peers': peers, }, } @metadata_reactor.provides( 'wireguard/peers', ) def peer_endpoints(metadata): peers = {} for name, config in metadata.get('wireguard/peers', {}).items(): try: rnode = repo.get_node(name) except NoSuchNode: continue peers[rnode.name] = { 'endpoint': '{}:{}'.format( rnode.metadata.get('wireguard/external_hostname', rnode.hostname), rnode.metadata.get(f'wireguard/peers/{node.name}/my_port', 51820), ), } return { 'wireguard': { 'peers': peers, }, } @metadata_reactor.provides( 'icinga2_api/wireguard/services', ) def icinga2(metadata): services = {} for peer, config in sorted(metadata.get('wireguard/peers', {}).items()): if config.get('exclude_from_monitoring', False): continue services[f'WIREGUARD CONNECTION {peer}'] = { 'command_on_monitored_host': config['pubkey'].format_into(f'sudo /usr/local/share/icinga/plugins/check_wireguard_connected wg_{config["iface"]} {{}}'), } return { 'icinga2_api': { 'wireguard': { 'services': services, }, }, } @metadata_reactor.provides( 'firewall/port_rules', ) def firewall(metadata): ports = {} for name, config in metadata.get('wireguard/peers').items(): try: rnode = repo.get_node(name) except NoSuchNode: # roadwarrior ports['{}/udp'.format(config['my_port'])] = atomic(set(metadata.get('wireguard/restrict-to', set()))) else: ports['{}/udp'.format(config['my_port'])] = atomic({name}) return { 'firewall': { 'port_rules': ports, }, } @metadata_reactor.provides( 'interfaces', ) def interface_ips(metadata): interfaces = {} snat_ip = metadata.get('wireguard/snat_ip', None) for peer, config in sorted(metadata.get('wireguard/peers', {}).items()): if '/' in config['my_ip']: my_ip = config['my_ip'] else: my_ip = '{}/31'.format(config['my_ip']) ips = {my_ip} if snat_ip: ips.add(snat_ip) interfaces[f'wg_{config["iface"]}'] = { 'ips': ips, } return { 'interfaces': interfaces, } @metadata_reactor.provides( 'nftables/rules/10-wireguard', ) def snat(metadata): if not node.has_bundle('nftables') or node.os == 'arch': raise DoNotRunAgain snat_ip = metadata.get('wireguard/snat_ip', None) rules = set() for peer, config in sorted(metadata.get('wireguard/peers', {}).items()): rules.add(f'inet filter forward iifname wg_{config["iface"]} accept') rules.add(f'inet filter forward oifname wg_{config["iface"]} accept') if snat_ip: rules.add('nat postrouting ip saddr {} ip daddr != {} snat to {}'.format( config['my_ip'], config['their_ip'], snat_ip, )) return { 'nftables': { 'rules': { '10-wireguard': sorted(rules), }, }, }