bundlewrap/bundles/nftables/metadata.py

91 lines
2.8 KiB
Python

from bundlewrap.exceptions import BundleError
defaults = {
'apt': {
'packages': {
'nftables': {},
# XXX remove after all systems have been migrated
},
},
'pacman': {
'packages': {
'nftables': {},
'iptables-nft': {
# uninstalls iptables automatically
'needed_by': {
'pkg_pacman:nftables',
},
},
},
},
}
if not node.has_bundle('vmhost'):
# see comment in bundles/vmhost/items.py
defaults['apt']['packages']['iptables'] = {
'installed': False,
'needed_by': {
'pkg_apt:nftables',
},
}
@metadata_reactor.provides(
'nftables/rules/input/port_rules',
)
def port_rules_to_nftables(metadata):
# Using this, bundles can simply set up port based rules. This
# reactor will then take care of converting those rules to actual
# nftables rules
ruleset = set()
# Plese note we do not set any defaults for ports. Bundles are
# expected to know themselves which default to use.
for portdef, targets in metadata.get('firewall/port_rules', {}).items():
if '/' in portdef:
port, proto = portdef.split('/', 2)
if proto not in {'udp'}:
raise BundleError(f'firewall/port_rules: illegal identifier {portdef} in metadata for {node.name}')
else:
port = portdef
proto = 'tcp'
for target in targets:
if port == '*' and target == '*':
raise BundleError('firewall/port_rules: setting both port and target to * is unsupported')
comment = f'# port_rules {target}'
if port != '*':
if ':' in port:
parts = port.split(':')
port_str = f'dport {{ {parts[0]}-{parts[1]} }} '
else:
port_str = f'dport {port} '
prefix = ''
else:
port_str = ''
prefix = 'meta l4proto '
if target == '*':
ruleset.add(f'{prefix}{proto} {port_str}accept {comment}')
else:
resolved = repo.libs.tools.resolve_identifier(repo, target)
for address in resolved['ipv4']:
ruleset.add(f'{prefix}{proto} {port_str}ip saddr {address} accept {comment}')
for address in resolved['ipv6']:
ruleset.add(f'{prefix}{proto} {port_str}ip6 saddr {address} accept {comment}')
return {
'nftables': {
'rules': {
# order does not matter here.
'input': {
'port_rules': sorted(ruleset),
},
},
},
}