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[client] Add stateful userspace firewall and remove egress filters (#3093)

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- Add stateful firewall functionality for UDP/TCP/ICMP in userspace firewalll
- Removes all egress drop rules/filters, still needs refactoring so we don't add output rules to any chains/filters.
- on Linux, if the OUTPUT policy is DROP  then we don't do anything about it (no extra allow rules). This is up to the user, if they don't want anything leaving their machine they'll have to manage these rules explicitly.
This commit is contained in:
Viktor Liu
2024-12-23 18:22:17 +01:00
committed by GitHub
parent 05930ee6b1
commit ad9f044aad
16 changed files with 3104 additions and 120 deletions
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6
client/firewall/iptables/acl_linux.go
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@ -332,18 +332,12 @@ func (m *aclManager) createDefaultChains() error {
// The OUTPUT chain gets an extra rule to allow traffic to any set up routes, the return traffic is handled by the INPUT related/established rule.
func (m *aclManager) seedInitialEntries() {
established := getConntrackEstablished()
m.appendToEntries("INPUT", []string{"-i", m.wgIface.Name(), "-j", "DROP"})
m.appendToEntries("INPUT", []string{"-i", m.wgIface.Name(), "-j", chainNameInputRules})
m.appendToEntries("INPUT", append([]string{"-i", m.wgIface.Name()}, established...))
m.appendToEntries("OUTPUT", []string{"-o", m.wgIface.Name(), "-j", "DROP"})
m.appendToEntries("OUTPUT", []string{"-o", m.wgIface.Name(), "-j", chainNameOutputRules})
m.appendToEntries("OUTPUT", []string{"-o", m.wgIface.Name(), "!", "-d", m.wgIface.Address().String(), "-j", "ACCEPT"})
m.appendToEntries("OUTPUT", append([]string{"-o", m.wgIface.Name()}, established...))
m.appendToEntries("FORWARD", []string{"-i", m.wgIface.Name(), "-j", "DROP"})
m.appendToEntries("FORWARD", []string{"-i", m.wgIface.Name(), "-j", m.routingFwChainName})
m.appendToEntries("FORWARD", append([]string{"-o", m.wgIface.Name()}, established...))