63 lines
2.3 KiB
Python
63 lines
2.3 KiB
Python
from bundlewrap.exceptions import BundleError
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@metadata_reactor.provides(
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'nftables/rules/99-port_rules',
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)
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def port_rules_to_nftables(metadata):
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# Using this, bundles can simply set up port based rules. This
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# reactor will then take care of converting those rules to actual
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# nftables rules
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ruleset = set()
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# Plese note we do not set any defaults for ports. Bundles are
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# expected to know themselves which default to use.
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for portdef, targets in metadata.get('firewall/port_rules', {}).items():
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if '/' in portdef:
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port, proto = portdef.split('/', 2)
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if proto not in {'udp'}:
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raise BundleError(f'firewall/port_rules: illegal identifier {portdef} in metadata for {node.name}')
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else:
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port = portdef
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proto = 'tcp'
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for target in targets:
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if port == '*' and target == '*':
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raise BundleError('firewall/port_rules: setting both port and target to * is unsupported')
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comment = f'comment "port_rules {target}"'
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if port != '*':
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if ':' in port:
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parts = port.split(':')
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port_str = f'{proto} dport {{ {parts[0]}-{parts[1]} }}'
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else:
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port_str = f'{proto} dport {port}'
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else:
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port_str = f'meta l4proto {proto}'
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if target in ('ipv4', 'ipv6'):
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version_str = f'meta nfproto {target}'
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else:
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version_str = ''
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if target in ('*', 'ipv4', 'ipv6'):
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ruleset.add(f'inet filter input {version_str} {port_str} accept {comment}')
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else:
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resolved = repo.libs.tools.resolve_identifier(repo, target)
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for address in resolved['ipv4']:
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ruleset.add(f'inet filter input meta nfproto ipv4 {port_str} ip saddr {address} accept {comment}')
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for address in resolved['ipv6']:
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ruleset.add(f'inet filter input meta nfproto ipv6 {port_str} ip6 saddr {address} accept {comment}')
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return {
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'nftables': {
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'rules': {
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# order does not matter here.
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'99-port_rules': sorted(ruleset),
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},
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},
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}
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