54 lines
1.9 KiB
Python
54 lines
1.9 KiB
Python
from bundlewrap.exceptions import BundleError
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@metadata_reactor.provides(
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'iptables/bundle_rules/iptables',
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)
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def port_rules_to_iptables(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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# iptables 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('iptables/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'iptables/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('iptables/port_rules: setting both port and target to * is unsupported')
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comment = f'-m comment --comment "iptables port_rules {target}"'
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if port != '*':
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port_str = f'--dport {port}'
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else:
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port_str = ''
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if target == '*':
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ruleset.add(f'iptables_both -A INPUT -p {proto} {port_str} {comment} -j ACCEPT')
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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'iptables -A INPUT -p {proto} -s {address} {port_str} {comment} -j ACCEPT')
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for address in resolved['ipv6']:
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ruleset.add(f'ip6tables -A INPUT -p {proto} -s {address} {port_str} {comment} -j ACCEPT')
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return {
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'iptables': {
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'bundle_rules': {
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# order does not matter here.
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'iptables': list(sorted(ruleset)),
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},
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},
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}
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