307 lines
18 KiB
Python
307 lines
18 KiB
Python
from modules.firewall.models import FirewallSettings, Action, Rule, Protocol, Mode, Table
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from utils import nftables_int_to_json, ip_family, NFTableManager, is_ip_parse
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import copy
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class FiregexTables(NFTableManager):
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rules_chain_in = "firegex_firewall_rules_in"
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rules_chain_out = "firegex_firewall_rules_out"
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rules_chain_fwd = "firegex_firewall_rules_fwd"
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filter_table = "filter"
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mangle_table = "mangle"
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def init_comands(self, policy:str=Action.ACCEPT, opt:
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FirewallSettings|None = None):
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rules = [
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{"add":{"table":{"name":self.filter_table,"family":"ip"}}},
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{"add":{"table":{"name":self.filter_table,"family":"ip6"}}},
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{"add":{"table":{"name":self.mangle_table,"family":"ip"}}},
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{"add":{"table":{"name":self.mangle_table,"family":"ip6"}}},
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{"add":{"chain":{"family":"ip","table":self.filter_table, "name":"INPUT","type":"filter","hook":"input","prio":0,"policy":policy}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":"INPUT","type":"filter","hook":"input","prio":0,"policy":policy}}},
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{"add":{"chain":{"family":"ip","table":self.filter_table,"name":"FORWARD","type":"filter","hook":"forward","prio":0,"policy":policy}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":"FORWARD","type":"filter","hook":"forward","prio":0,"policy":policy}}},
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{"add":{"chain":{"family":"ip","table":self.filter_table,"name":"OUTPUT","type":"filter","hook":"output","prio":0,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":"OUTPUT","type":"filter","hook":"output","prio":0,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip","table":self.mangle_table, "name":"PREROUTING","type":"filter","hook":"prerouting","prio":-150,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip6","table":self.mangle_table,"name":"PREROUTING","type":"filter","hook":"prerouting","prio":-150,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip","table":self.mangle_table, "name":"POSTROUTING","type":"filter","hook":"postrouting","prio":-150,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip6","table":self.mangle_table,"name":"POSTROUTING","type":"filter","hook":"postrouting","prio":-150,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip","table":self.filter_table,"name":self.rules_chain_in}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":self.rules_chain_in}}},
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{"add":{"chain":{"family":"ip","table":self.filter_table,"name":self.rules_chain_out}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":self.rules_chain_out}}},
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{"add":{"chain":{"family":"ip","table":self.filter_table,"name":self.rules_chain_fwd}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":self.rules_chain_fwd}}},
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{"add":{"chain":{"family":"ip","table":self.mangle_table,"name":self.rules_chain_in}}},
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{"add":{"chain":{"family":"ip6","table":self.mangle_table,"name":self.rules_chain_in}}},
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{"add":{"chain":{"family":"ip","table":self.mangle_table,"name":self.rules_chain_out}}},
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{"add":{"chain":{"family":"ip6","table":self.mangle_table,"name":self.rules_chain_out}}},
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]
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if opt is None:
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return rules
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if opt.allow_loopback:
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rules.extend([
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_out,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "iif" }}, "right": "lo"}},{"accept": None}]
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}}},
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "iif" }}, "right": "lo"}},{"accept": None}]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_out,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "iif" }}, "right": "lo"}},{"accept": None}]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "iif" }}, "right": "lo"}},{"accept": None}]
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}}}
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])
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if opt.allow_established:
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rules.extend([
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": {"op": "in", "left": { "ct": { "key": "state" }},"right": ["related", "established"]} },{ "accept": None }]
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}}},
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_fwd,
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"expr": [{ "match": {"op": "in", "left": { "ct": { "key": "state" }},"right": ["related", "established"]} },{ "accept": None }]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": {"op": "in", "left": { "ct": { "key": "state" }},"right": ["related", "established"]} },{ "accept": None }]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_fwd,
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"expr": [{ "match": {"op": "in", "left": { "ct": { "key": "state" }},"right": ["related", "established"]} },{ "accept": None }]
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}}}
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])
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if opt.drop_invalid:
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rules.extend([
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": {"op": "==", "left": { "ct": { "key": "state" }},"right": "invalid"} },{ "drop": None }]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": {"op": "==", "left": { "ct": { "key": "state" }},"right": "invalid"} },{ "drop": None }]
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}}}
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])
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if opt.allow_icmp:
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rules.extend([
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "l4proto" } }, "right": "icmp"} },{ "accept": None }]
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}}},
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_fwd,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "l4proto" } }, "right": "icmp"} },{ "accept": None }]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "l4proto" } }, "right": "ipv6-icmp"} },{ "accept": None }]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_fwd,
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"expr": [{ "match": { "op": "==", "left": { "meta": { "key": "l4proto" } }, "right": "ipv6-icmp"} },{ "accept": None }]
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}}}
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])
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if opt.multicast_dns:
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rules.extend([
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [
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{ 'match': {'left': {'payload': {'protocol': "ip", 'field': 'daddr'}}, 'op': '==', 'right': nftables_int_to_json("224.0.0.251/32")} },
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'dport'}}, 'op': '==', 'right': 5353} },
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{ "accept": None }
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]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [
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{ 'match': {'left': {'payload': {'protocol': "ip6", 'field': 'daddr'}}, 'op': '==', 'right': nftables_int_to_json("ff02::fb/128")} },
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'dport'}}, 'op': '==', 'right': 5353} },
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{ "accept": None }
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]
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}}},
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])
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if opt.allow_upnp:
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rules.extend([
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [
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{ 'match': {'left': {'payload': {'protocol': "ip", 'field': 'daddr'}}, 'op': '==', 'right': nftables_int_to_json("239.255.255.250/32")} },
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'dport'}}, 'op': '==', 'right': 1900} },
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{ "accept": None }
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]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [
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{ 'match': {'left': {'payload': {'protocol': "ip6", 'field': 'daddr'}}, 'op': '==', 'right': nftables_int_to_json("ff02::f/128")} },
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'dport'}}, 'op': '==', 'right': 1900} },
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{ "accept": None }
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]
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}}},
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])
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if opt.allow_dhcp:
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rules.extend([
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{ "add":{ "rule": {
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"family": "ip", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'sport'}}, 'op': '==', 'right': 67} },
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'dport'}}, 'op': '==', 'right': 68} },
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{ "accept": None }
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]
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}}},
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{ "add":{ "rule": {
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"family": "ip6", "table": self.filter_table, "chain": self.rules_chain_in,
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"expr": [
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'sport'}}, 'op': '==', 'right': 67} },
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{ 'match': {'left': {'payload': {'protocol': "udp", 'field': 'dport'}}, 'op': '==', 'right': 68} },
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{ "accept": None }
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]
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}}},
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])
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return rules
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def __init__(self):
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super().__init__(self.init_comands(),[
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#Needed to reset to ALLOW when fireall is disabled (DO NOT REMOVE)
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{"add":{"chain":{"family":"ip","table":self.filter_table, "name":"INPUT","type":"filter","hook":"input","prio":0,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":"INPUT","type":"filter","hook":"input","prio":0,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip","table":self.filter_table,"name":"FORWARD","type":"filter","hook":"forward","prio":0,"policy":Action.ACCEPT}}},
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{"add":{"chain":{"family":"ip6","table":self.filter_table,"name":"FORWARD","type":"filter","hook":"forward","prio":0,"policy":Action.ACCEPT}}},
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{"flush":{"chain":{"table":self.filter_table,"family":"ip", "name":self.rules_chain_in}}},
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{"flush":{"chain":{"table":self.filter_table,"family":"ip", "name":self.rules_chain_out}}},
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{"flush":{"chain":{"table":self.filter_table,"family":"ip", "name":self.rules_chain_fwd}}},
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{"flush":{"chain":{"table":self.filter_table,"family":"ip6", "name":self.rules_chain_in}}},
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{"flush":{"chain":{"table":self.filter_table,"family":"ip6", "name":self.rules_chain_out}}},
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{"flush":{"chain":{"table":self.filter_table,"family":"ip6", "name":self.rules_chain_fwd}}},
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{"flush":{"chain":{"table":self.mangle_table,"family":"ip", "name":self.rules_chain_in}}},
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{"flush":{"chain":{"table":self.mangle_table,"family":"ip", "name":self.rules_chain_out}}},
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{"flush":{"chain":{"table":self.mangle_table,"family":"ip6", "name":self.rules_chain_in}}},
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{"flush":{"chain":{"table":self.mangle_table,"family":"ip6", "name":self.rules_chain_out}}}
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])
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def chain_to_firegex(self, chain:str, table:str):
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if table == self.filter_table:
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match chain:
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case "INPUT":
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return self.rules_chain_in
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case "OUTPUT":
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return self.rules_chain_out
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case "FORWARD":
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return self.rules_chain_fwd
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elif table == self.mangle_table:
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match chain:
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case "PREROUTING":
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return self.rules_chain_in
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case "POSTROUTING":
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return self.rules_chain_out
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return None
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def insert_firegex_chains(self):
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rules:list[dict] = list(self.list_rules(tables=[self.filter_table, self.mangle_table], chains=["INPUT", "OUTPUT", "FORWARD", "PREROUTING", "POSTROUTING"]))
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for table in [self.filter_table, self.mangle_table]:
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for family in ["ip", "ip6"]:
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for chain in ["INPUT", "OUTPUT", "FORWARD"] if table == self.filter_table else ["PREROUTING", "POSTROUTING"]:
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found = False
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rule_to_add = [{ "jump": { "target": self.chain_to_firegex(chain, table) }}]
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for r in rules:
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if r.get("family") == family and r.get("table") == table and r.get("chain") == chain and r.get("expr") == rule_to_add:
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found = True
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break
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if found:
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continue
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yield { "add":{ "rule": {
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"family": family,
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"table": table,
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"chain": chain,
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"expr": rule_to_add
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}}}
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def set(self, srvs:list[Rule], policy:str=Action.ACCEPT, opt:FirewallSettings = None):
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srvs = list(srvs)
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self.reset()
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if policy == Action.REJECT:
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policy = Action.DROP
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srvs.append(Rule(
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proto=Protocol.ANY,
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src="",
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dst="",
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port_src_from=1,
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port_dst_from=1,
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port_src_to=65535,
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port_dst_to=65535,
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action=Action.REJECT,
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mode=Mode.IN,
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table=Table.FILTER
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))
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rules = self.init_comands(policy, opt) + list(self.insert_firegex_chains()) + self.get_rules(*srvs)
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self.cmd(*rules)
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def get_rules(self,*srvs:Rule):
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rules = []
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final_srvs:list[Rule] = []
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for ele in srvs:
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if ele.proto == Protocol.BOTH:
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udp_rule = copy.deepcopy(ele)
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udp_rule.proto = Protocol.UDP.value
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ele.proto = Protocol.TCP.value
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final_srvs.append(udp_rule)
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final_srvs.append(ele)
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families = ["ip", "ip6"]
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for srv in final_srvs:
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ip_filters = []
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if srv.src != "":
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if is_ip_parse(srv.src):
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ip_filters.append({'match': {'left': {'payload': {'protocol': ip_family(srv.src), 'field': 'saddr'}}, 'op': '==', 'right': nftables_int_to_json(srv.src)}})
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families = [ip_family(srv.src)]
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else:
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ip_filters.append({"match": { "op": "==", "left": { "meta": { "key": "iifname" } }, "right": srv.src} })
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if srv.dst != "":
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if is_ip_parse(srv.dst):
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ip_filters.append({'match': {'left': {'payload': {'protocol': ip_family(srv.dst), 'field': 'daddr'}}, 'op': '==', 'right': nftables_int_to_json(srv.dst)}})
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families = [ip_family(srv.dst)]
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else:
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ip_filters.append({"match": { "op": "==", "left": { "meta": { "key": "oifname" } }, "right": srv.dst} })
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port_filters = []
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if srv.proto not in [Protocol.ANY, Protocol.BOTH]:
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if srv.port_src_from != 1 or srv.port_src_to != 65535: #Any Port
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port_filters.append({'match': {'left': {'payload': {'protocol': str(srv.proto), 'field': 'sport'}}, 'op': '>=', 'right': int(srv.port_src_from)}})
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port_filters.append({'match': {'left': {'payload': {'protocol': str(srv.proto), 'field': 'sport'}}, 'op': '<=', 'right': int(srv.port_src_to)}})
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if srv.port_dst_from != 1 or srv.port_dst_to != 65535: #Any Port
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port_filters.append({'match': {'left': {'payload': {'protocol': str(srv.proto), 'field': 'dport'}}, 'op': '>=', 'right': int(srv.port_dst_from)}})
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port_filters.append({'match': {'left': {'payload': {'protocol': str(srv.proto), 'field': 'dport'}}, 'op': '<=', 'right': int(srv.port_dst_to)}})
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if len(port_filters) == 0:
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port_filters.append({'match': {'left': {'meta': {'key': 'l4proto'}}, 'op': '==', 'right': srv.proto}}) #filter the protocol if no port is specified
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end_rules = [{'accept': None} if srv.action == "accept" else {'reject': {}} if (srv.action == "reject" and not srv.output_mode) else {'drop': None}]
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#If srv.output_mode is True, then the rule is in the output chain, so the reject action is not allowed
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for fam in families:
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rules.append({ "add":{ "rule": {
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"family": fam,
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"table": srv.table,
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"chain": self.rules_chain_out if srv.output_mode else self.rules_chain_in if srv.input_mode else self.rules_chain_fwd,
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"expr": ip_filters + port_filters + end_rules
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}}})
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return rules
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def add(self, *srvs:Rule):
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self.cmd(*self.get_rules(*srvs)) |