minor fixes
This commit is contained in:
User
parent
dde922f888
commit
bb8e243e47
2 changed files with 151 additions and 174 deletions
313
firewall.py
313
firewall.py
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@ -17,7 +17,7 @@ from pydantic import (
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validator,
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root_validator,
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)
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from typing import Generator, Generic, TypeAlias, TypeVar
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from typing import Iterator, Generic, TypeAlias, TypeVar
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from yaml import safe_load
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import nft
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@ -50,7 +50,7 @@ class RestrictiveBaseModel(BaseModel):
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# Ports
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Port: TypeAlias = conint(ge=0, le=2**16)
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Port: TypeAlias = conint(ge=0, lt=2**16)
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class PortRange(str):
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@ -64,9 +64,13 @@ class PortRange(str):
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start, end = v.split("..")
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except AttributeError:
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parse_obj_as(Port, v) # This is the expected error
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raise ValueError("invalid port range: must be in the form start..end")
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raise ValueError(
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"invalid port range: must be in the form start..end"
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)
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except ValueError:
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raise ValueError("invalid port range: must be in the form start..end")
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raise ValueError(
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"invalid port range: must be in the form start..end"
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)
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start, end = parse_obj_as(Port, start), parse_obj_as(Port, end)
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if start > end:
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@ -148,14 +152,10 @@ class Rule(RestrictiveBaseModel):
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verdict: Verdict = Verdict.accept
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class ForwardRule(Rule):
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dest: AutoSet[IPvAnyNetwork | ZoneName] | None
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class Filter(RestrictiveBaseModel):
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input: list[Rule] = list()
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output: list[Rule] = list()
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forward: list[ForwardRule] = list()
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forward: list[Rule] = list()
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# Nat
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@ -200,7 +200,9 @@ def resolve_zones(yaml_zones: dict[ZoneName, ZoneEntry]) -> Zones:
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for name in TopologicalSorter(zone_graph).static_order():
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if yaml_zones[name].addrs:
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zones[name] = ResolvedZone(yaml_zones[name].addrs, yaml_zones[name].negate)
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zones[name] = ResolvedZone(
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yaml_zones[name].addrs, yaml_zones[name].negate
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)
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elif yaml_zones[name].file is not None:
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with open(yaml_zones[name].file, "r") as file:
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@ -208,10 +210,12 @@ def resolve_zones(yaml_zones: dict[ZoneName, ZoneEntry]) -> Zones:
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yaml_addrs = ZoneFile(__root__=safe_load(file))
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except Exception as e:
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raise Exception(
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f"YAML parsing failed of the included file '{yaml_zones[name].file}': {e}"
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f"YAML parsing of the included file '{yaml_zones[name].file}' failed: {e}"
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)
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zones[name] = ResolvedZone(yaml_addrs.__root__, yaml_zones[name].negate)
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zones[name] = ResolvedZone(
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yaml_addrs.__root__, yaml_zones[name].negate
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)
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elif yaml_zones[name].zones:
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addrs: set[IPvAnyNetwork] = set()
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@ -227,9 +231,7 @@ def resolve_zones(yaml_zones: dict[ZoneName, ZoneEntry]) -> Zones:
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# ==========[ PARSER ]==========================================================
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def unmarshall_ports(
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elements: set[Port | PortRange],
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) -> Generator[int, None, None]:
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def unmarshall_ports(elements: set[Port | PortRange]) -> Iterator[int]:
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for element in elements:
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if isinstance(element, int):
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yield element
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@ -238,7 +240,7 @@ def unmarshall_ports(
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def split_v4_v6(
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addrs: Generator[IPvAnyNetwork, None, None]
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addrs: Iterator[IPvAnyNetwork],
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) -> tuple[set[nft.Immediate[IPv4Network]], set[nft.Immediate[IPv6Network]]]:
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v4, v6 = set(), set()
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@ -257,7 +259,7 @@ def zones_into_ip(
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elements: set[IPvAnyNetwork | ZoneName],
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zones: Zones,
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allow_negate: bool = True,
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) -> Generator[IPvAnyNetwork, None, None]:
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) -> Iterator[IPvAnyNetwork]:
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for element in elements:
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match element:
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case ZoneName():
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@ -365,154 +367,130 @@ def parse_reverse_path_filter(rpf: ReversePathFilter) -> nft.Table:
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return table
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def parse_filter_rule(rule: Rule, zones: Zones) -> list[nft.Rule]:
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match_inet = []
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match_v4 = []
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match_v6 = []
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for attr in ("iif", "oif"):
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if getattr(rule, attr, None) is not None:
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match_inet.append(
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nft.Match(
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op="==",
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left=nft.Meta(f"{attr}name"),
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right=nft.Immediate(getattr(rule, attr)),
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)
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)
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for attr, field in (("src", "saddr"), ("dst", "daddr")):
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if getattr(rule, attr, None) is not None:
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addr_v4, addr_v6 = split_v4_v6(
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zones_into_ip(getattr(rule, attr), zones)
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)
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if addr_v4 and match_v4 is not None:
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match_v4.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol="ip", field=field),
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right=nft.Immediate(addr_v4),
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)
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)
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else:
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match_v4 = None
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if addr_v6 and match_v6 is not None:
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match_v6.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol="ip6", field=field),
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right=nft.Immediate(addr_v6),
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)
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)
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else:
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match_v6 = None
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protos = {
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"icmp": ("icmp", "icmpv6"),
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"ospf": (89, 89),
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"vrrp": (112, 112),
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}
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protos_v4 = {
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v for p, (v, _) in protos.items() if getattr(rule.protocols, p)
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}
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protos_v6 = {
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v for p, (_, v) in protos.items() if getattr(rule.protocols, p)
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}
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if protos_v4 and match_v4 is not None:
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match_v4.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol="ip", field="protocol"),
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right=nft.Immediate(protos_v4),
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)
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)
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if protos_v6 and match_v6 is not None:
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match_v6.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol="ip6", field="nexthdr"),
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right=nft.Immediate(protos_v6),
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)
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)
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proto_ports = (
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("udp", "dport"),
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("udp", "sport"),
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("tcp", "dport"),
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("tcp", "sport"),
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)
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for proto, port in proto_ports:
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if rule.protocols[proto][port]:
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ports = set(unmarshall_ports(rule.protocols[proto][port]))
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match_inet.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol=proto, field=port),
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right=nft.Immediate(ports),
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)
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)
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verdicts = [nft.Verdict(rule.verdict.value)]
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if match_v4 == [] and match_v6 == []:
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yield nft.Rule(match_inet + verdicts)
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else:
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if match_v4 is not None:
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yield nft.Rule(match_inet + match_v4 + verdicts)
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if match_v6 is not None:
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yield nft.Rule(match_inet + match_v6 + verdicts)
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# Create a chain "{hook}_filter" and for each rule from the DSL:
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# - Create a specific chain "{hook}_rules_{i}"
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# - If needed, add a network range in the set "{hook}_set_{i}"
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# - Add a rule to "input_filter" that jumps to chain "{hook}_rules_{i}"
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def parse_filter_rules(hook: str, rules: list[Rule], zones: Zones) -> list[nft.Chain]:
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# Container of every "{hook}_set_{i}"
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all_chains = []
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# The chain "{hook}_filter"
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chain_hook = nft.Chain(
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name=f"{hook}_filter",
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def parse_filter_rules(
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hook: str, rules: list[Rule], zones: Zones
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) -> nft.Chain:
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chain = nft.Chain(
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name=hook,
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type="filter",
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hook=hook,
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policy="drop", # TODO: Correct default policy
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priority=0,
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)
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for i, rule in enumerate(rules):
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# Container of v4/v6 zones rules of "{hook}_rules_{i}", if needed
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v4: nft.Match | None = None
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v6: nft.Match | None = None
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chain.rules.append(nft.Rule([nft.Jump("conntrack")]))
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# Container of rules of "{hook}_filter"
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chain_hook_rules: list[nft.Statement] = []
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for rule in rules:
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chain.rules.extend(list(parse_filter_rule(rule, zones)))
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# Container of specific rules of "{hook}_rules_{i}"
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chain_spec_rules: list[nft.Statement] = []
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# Input/Output interface: chain "{hook}_filter"
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if rule.iif is not None:
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chain_hook_rules.append(
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nft.Match(
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op="==",
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left=nft.Meta("iifname"),
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right=nft.Immediate(rule.iif),
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)
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)
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if rule.oif is not None:
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chain_hook_rules.append(
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nft.Match(
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op="==",
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left=nft.Meta("oifname"),
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right=nft.Immediate(rule.oif),
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)
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)
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# Source/Destination: chain "{hook}_filter"
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if rule.src is not None:
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ip_v4, ip_v6 = split_v4_v6(zones_into_ip(rule.src, zones))
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if ip_v4:
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v4 = nft.Match(
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op="==",
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left=nft.Payload(protocol="ip", field="saddr"),
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right=nft.Immediate(ip_v4),
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)
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if ip_v6:
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v6 = nft.Match(
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op="==",
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left=nft.Payload(protocol="ip6", field="saddr"),
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right=nft.Immediate(ip_v6),
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)
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# Protocols (ICMP/OSPF/VRRP): chain "{hook}_rules_{i}"
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protocols_v4 = set()
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protocols_v6 = set()
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for protoname_v4, protoname_v6 in [
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("icmp", "ipv6-icmp"),
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("ospf", "ospf"),
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("vrrp", "vrrp"),
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]:
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if rule.protocols[protoname_v4]:
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protocols_v4.add(protoname_v4)
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protocols_v6.add(protoname_v6)
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if protocols_v4:
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chain_spec_rules.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol="ip", field="protocol"),
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right=nft.Immediate(protocols_v4),
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)
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)
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chain_spec_rules.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol="ip6", field="nexthdr"),
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right=nft.Immediate(protocols_v6),
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)
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)
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# Protocol UDP/TCP: chain "{hook}_rules_{i}"
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for proto, port in [
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("udp", "dport"),
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("udp", "sport"),
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("tcp", "dport"),
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("tcp", "sport"),
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]:
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if rule.protocols[proto][port]:
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ports = set(unmarshall_ports(rule.protocols[proto][port]))
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chain_spec_rules.append(
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nft.Match(
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op="==",
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left=nft.Payload(protocol=proto, field=port),
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right=nft.Immediate(ports),
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)
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)
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# Verdict: specific chain "{hook}_rules_{i}"
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if rule.verdict == Verdict.accept:
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rules_verdict = nft.Verdict("accept")
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elif rule.verdict == Verdict.drop:
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rules_verdict = nft.Verdict("drop")
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elif rule.verdict == Verdict.reject:
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rules_verdict = nft.Verdict("reject")
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# Create the chain "{hook}_rules_{i}"
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chain = nft.Chain(name=f"{hook}_rules_{i}")
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for spec_rule in chain_spec_rules:
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chain.rules.append(nft.Rule([spec_rule, rules_verdict]))
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# TODO: Is it mandatory when `chain_spec_rules` is not empty?
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chain.rules.append(nft.Rule([rules_verdict]))
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all_chains.append(chain)
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# Add the chain "{hook}_rules_{i}" to the chain "{hook}_filter"
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if v4 is not None:
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chain_hook.rules.append(nft.Rule(
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[v4] + chain_hook_rules + [nft.Goto(f"{hook}_rules_{i}")]
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))
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if v6 is not None:
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chain_hook.rules.append(nft.Rule(
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[v6] + chain_hook_rules + [nft.Goto(f"{hook}_rules_{i}")]
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))
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if v4 is None and v6 is None:
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chain_hook.rules.append(nft.Rule(
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chain_hook_rules + [nft.Goto(f"{hook}_rules_{i}")]
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))
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return all_chains + [chain_hook]
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return chain
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def parse_filter(filter: Filter, zones: Zones) -> nft.Table:
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@ -531,27 +509,20 @@ def parse_filter(filter: Filter, zones: Zones) -> nft.Table:
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right=nft.Immediate("invalid"),
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)
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chain_conntrack.rules.extend(
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[
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nft.Rule([rule_ct_accept, nft.Verdict("accept")]),
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nft.Rule([rule_ct_drop, nft.Counter(), nft.Verdict("drop")]),
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]
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)
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# Input/Output/Forward chains
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chains_input = parse_filter_rules("input", filter.input, zones)
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chains_output = parse_filter_rules("output", filter.output, zones)
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# TODO: dest rule in ForwardRule
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chains_forward = parse_filter_rules("forward", filter.forward, zones)
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chain_conntrack.rules = [
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nft.Rule([rule_ct_accept, nft.Verdict("accept")]),
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nft.Rule([rule_ct_drop, nft.Counter(), nft.Verdict("drop")]),
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]
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# Resulting table
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table = nft.Table(name="filter", family="inet")
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table.chains.extend([chain_conntrack])
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table.chains.extend(chains_input)
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table.chains.extend(chains_output)
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table.chains.extend(chains_forward)
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table.chains.append(chain_conntrack)
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# Input/Output/Forward chains
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for name in ("input", "output", "forward"):
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chain = parse_filter_rules(name, getattr(filter, name), zones)
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table.chains.append(chain)
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return table
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@ -588,7 +559,7 @@ def send_to_nftables(cmd: nft.JsonNftables) -> int:
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print(f"nft returned {rc}: {error}")
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return 1
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if len(output) != 0:
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if len(output):
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print(output)
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return 0
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|
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12
nft.py
12
nft.py
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@ -38,9 +38,7 @@ class Immediate(Generic[T]):
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value: T
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def to_nft(self) -> Any:
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if isinstance(self.value, IPv4Network) or isinstance(
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self.value, IPv6Network
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):
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if isinstance(self.value, IPv4Network | IPv6Network):
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return ip_to_nft(self.value)
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if isinstance(self.value, set):
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@ -88,6 +86,14 @@ class Goto:
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return {"goto": {"target": self.target}}
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@dataclass
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class Jump:
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target: str
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def to_nft(self) -> JsonNftables:
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return {"jump": {"target": self.target}}
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@dataclass
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class Match:
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op: str
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