mirror of
https://github.com/safing/portmaster
synced 2025-09-02 02:29:12 +00:00
323 lines
8 KiB
Go
323 lines
8 KiB
Go
package interception
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import (
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"fmt"
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"sort"
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"strings"
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"github.com/coreos/go-iptables/iptables"
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"github.com/safing/portmaster/firewall/interception/nfqueue"
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)
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// iptables -A OUTPUT -p icmp -j", "NFQUEUE", "--queue-num", "1", "--queue-bypass
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var (
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v4chains []string
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v4rules []string
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v4once []string
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v6chains []string
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v6rules []string
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v6once []string
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out4Queue *nfqueue.NFQueue
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in4Queue *nfqueue.NFQueue
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out6Queue *nfqueue.NFQueue
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in6Queue *nfqueue.NFQueue
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shutdownSignal = make(chan struct{})
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)
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func init() {
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v4chains = []string{
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"mangle C170",
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"mangle C171",
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"filter C17",
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}
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v4rules = []string{
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"mangle C170 -j CONNMARK --restore-mark",
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"mangle C170 -m mark --mark 0 -j NFQUEUE --queue-num 17040 --queue-bypass",
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"mangle C171 -j CONNMARK --restore-mark",
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"mangle C171 -m mark --mark 0 -j NFQUEUE --queue-num 17140 --queue-bypass",
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"filter C17 -m mark --mark 0 -j DROP",
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"filter C17 -m mark --mark 1700 -j RETURN",
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"filter C17 -m mark --mark 1701 -j REJECT --reject-with icmp-host-prohibited",
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"filter C17 -m mark --mark 1702 -j DROP",
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"filter C17 -j CONNMARK --save-mark",
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"filter C17 -m mark --mark 1710 -j RETURN",
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"filter C17 -m mark --mark 1711 -j REJECT --reject-with icmp-host-prohibited",
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"filter C17 -m mark --mark 1712 -j DROP",
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"filter C17 -m mark --mark 1717 -j RETURN",
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}
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v4once = []string{
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"mangle OUTPUT -j C170",
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"mangle INPUT -j C171",
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"filter OUTPUT -j C17",
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"filter INPUT -j C17",
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"nat OUTPUT -m mark --mark 1799 -p udp -j DNAT --to 127.0.0.1:53",
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"nat OUTPUT -m mark --mark 1717 -p tcp -j DNAT --to 127.0.0.17:1117",
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"nat OUTPUT -m mark --mark 1717 -p udp -j DNAT --to 127.0.0.17:1117",
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// "nat OUTPUT -m mark --mark 1717 ! -p tcp ! -p udp -j DNAT --to 127.0.0.17",
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}
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v6chains = []string{
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"mangle C170",
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"mangle C171",
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"filter C17",
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}
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v6rules = []string{
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"mangle C170 -j CONNMARK --restore-mark",
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"mangle C170 -m mark --mark 0 -j NFQUEUE --queue-num 17060 --queue-bypass",
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"mangle C171 -j CONNMARK --restore-mark",
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"mangle C171 -m mark --mark 0 -j NFQUEUE --queue-num 17160 --queue-bypass",
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"filter C17 -m mark --mark 0 -j DROP",
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"filter C17 -m mark --mark 1700 -j RETURN",
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"filter C17 -m mark --mark 1701 -j REJECT --reject-with icmp6-adm-prohibited",
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"filter C17 -m mark --mark 1702 -j DROP",
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"filter C17 -j CONNMARK --save-mark",
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"filter C17 -m mark --mark 1710 -j RETURN",
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"filter C17 -m mark --mark 1711 -j REJECT --reject-with icmp6-adm-prohibited",
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"filter C17 -m mark --mark 1712 -j DROP",
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"filter C17 -m mark --mark 1717 -j RETURN",
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}
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v6once = []string{
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"mangle OUTPUT -j C170",
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"mangle INPUT -j C171",
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"filter OUTPUT -j C17",
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"filter INPUT -j C17",
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"nat OUTPUT -m mark --mark 1799 -p udp -j DNAT --to [::1]:53",
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"nat OUTPUT -m mark --mark 1717 -p tcp -j DNAT --to [fd17::17]:1117",
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"nat OUTPUT -m mark --mark 1717 -p udp -j DNAT --to [fd17::17]:1117",
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// "nat OUTPUT -m mark --mark 1717 ! -p tcp ! -p udp -j DNAT --to [fd17::17]",
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}
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// Reverse because we'd like to insert in a loop
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_ = sort.Reverse(sort.StringSlice(v4once)) // silence vet (sort is used just like in the docs)
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_ = sort.Reverse(sort.StringSlice(v6once)) // silence vet (sort is used just like in the docs)
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}
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func activateNfqueueFirewall() error {
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// IPv4
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ip4tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
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if err != nil {
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return err
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}
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for _, chain := range v4chains {
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splittedRule := strings.Split(chain, " ")
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if err = ip4tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
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return err
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}
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}
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for _, rule := range v4rules {
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splittedRule := strings.Split(rule, " ")
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if err = ip4tables.Append(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
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return err
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}
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}
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var ok bool
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for _, rule := range v4once {
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splittedRule := strings.Split(rule, " ")
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ok, err = ip4tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
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if err != nil {
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return err
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}
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if !ok {
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if err = ip4tables.Insert(splittedRule[0], splittedRule[1], 1, splittedRule[2:]...); err != nil {
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return err
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}
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}
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}
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// IPv6
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ip6tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv6)
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if err != nil {
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return err
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}
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for _, chain := range v6chains {
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splittedRule := strings.Split(chain, " ")
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if err = ip6tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
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return err
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}
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}
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for _, rule := range v6rules {
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splittedRule := strings.Split(rule, " ")
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if err = ip6tables.Append(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
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return err
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}
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}
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for _, rule := range v6once {
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splittedRule := strings.Split(rule, " ")
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ok, err := ip6tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
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if err != nil {
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return err
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}
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if !ok {
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if err = ip6tables.Insert(splittedRule[0], splittedRule[1], 1, splittedRule[2:]...); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func deactivateNfqueueFirewall() error {
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// IPv4
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ip4tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
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if err != nil {
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return err
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}
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var ok bool
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for _, rule := range v4once {
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splittedRule := strings.Split(rule, " ")
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ok, err = ip4tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
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if err != nil {
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return err
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}
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if ok {
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if err = ip4tables.Delete(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
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return err
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}
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}
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}
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for _, chain := range v4chains {
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splittedRule := strings.Split(chain, " ")
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if err = ip4tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
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return err
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}
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if err = ip4tables.DeleteChain(splittedRule[0], splittedRule[1]); err != nil {
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return err
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}
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}
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// IPv6
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ip6tables, err := iptables.NewWithProtocol(iptables.ProtocolIPv6)
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if err != nil {
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return err
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}
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for _, rule := range v6once {
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splittedRule := strings.Split(rule, " ")
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ok, err := ip6tables.Exists(splittedRule[0], splittedRule[1], splittedRule[2:]...)
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if err != nil {
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return err
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}
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if ok {
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if err = ip6tables.Delete(splittedRule[0], splittedRule[1], splittedRule[2:]...); err != nil {
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return err
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}
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}
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}
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for _, chain := range v6chains {
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splittedRule := strings.Split(chain, " ")
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if err := ip6tables.ClearChain(splittedRule[0], splittedRule[1]); err != nil {
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return err
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}
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if err := ip6tables.DeleteChain(splittedRule[0], splittedRule[1]); err != nil {
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return err
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}
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}
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return nil
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}
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// StartNfqueueInterception starts the nfqueue interception.
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func StartNfqueueInterception() (err error) {
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err = activateNfqueueFirewall()
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if err != nil {
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_ = Stop()
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return fmt.Errorf("could not initialize nfqueue: %s", err)
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}
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out4Queue, err = nfqueue.NewNFQueue(17040)
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if err != nil {
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_ = Stop()
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return fmt.Errorf("interception: failed to create nfqueue(IPv4, in): %s", err)
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}
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in4Queue, err = nfqueue.NewNFQueue(17140)
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if err != nil {
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_ = Stop()
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return fmt.Errorf("interception: failed to create nfqueue(IPv4, in): %s", err)
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}
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out6Queue, err = nfqueue.NewNFQueue(17060)
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if err != nil {
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_ = Stop()
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return fmt.Errorf("interception: failed to create nfqueue(IPv4, in): %s", err)
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}
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in6Queue, err = nfqueue.NewNFQueue(17160)
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if err != nil {
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_ = Stop()
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return fmt.Errorf("interception: failed to create nfqueue(IPv4, in): %s", err)
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}
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go handleInterception()
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return nil
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}
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// StopNfqueueInterception stops the nfqueue interception.
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func StopNfqueueInterception() error {
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defer close(shutdownSignal)
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if out4Queue != nil {
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out4Queue.Destroy()
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}
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if in4Queue != nil {
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in4Queue.Destroy()
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}
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if out6Queue != nil {
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out6Queue.Destroy()
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}
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if in6Queue != nil {
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in6Queue.Destroy()
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}
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err := deactivateNfqueueFirewall()
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if err != nil {
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return fmt.Errorf("interception: error while deactivating nfqueue: %s", err)
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}
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return nil
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}
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func handleInterception() {
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for {
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select {
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case <-shutdownSignal:
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return
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case pkt := <-out4Queue.Packets:
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pkt.SetOutbound()
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Packets <- pkt
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case pkt := <-in4Queue.Packets:
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pkt.SetInbound()
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Packets <- pkt
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case pkt := <-out6Queue.Packets:
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pkt.SetOutbound()
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Packets <- pkt
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case pkt := <-in6Queue.Packets:
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pkt.SetInbound()
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Packets <- pkt
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}
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}
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}
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