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Block DNS requests with IPs 0.0.0.17 and ::17

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This commit is contained in:
Daniel 2020-11-04 15:51:30 +01:00
parent 24d21341fd
commit 057d167221
2 changed files with 13 additions and 4 deletions
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9
firewall/interception.go
View file

@ -2,6 +2,7 @@ package firewall
import (
"context"
"net"
"os"
"sync/atomic"
"time"
@ -29,6 +30,9 @@ var (
packetsBlocked = new(uint64)
packetsDropped = new(uint64)
packetsFailed = new(uint64)
blockedIPv4 = net.IPv4(0, 0, 0, 17)
blockedIPv6 = net.ParseIP("::17")
)
func init() {
@ -84,6 +88,11 @@ func handlePacket(ctx context.Context, pkt packet.Packet) {
func fastTrackedPermit(pkt packet.Packet) (handled bool) {
meta := pkt.Info()
// Check for blocked IP
if meta.Dst.Equal(blockedIPv4) || meta.Dst.Equal(blockedIPv6) {
_ = pkt.PermanentBlock()
}
switch meta.Protocol {
case packet.ICMP:
// Always permit ICMP.

8
nameserver/nsutil/nsutil.go
View file

@ -58,9 +58,9 @@ func ZeroIP(msgs ...string) ResponderFunc {
switch question.Qtype {
case dns.TypeA:
rr, err = dns.NewRR(question.Name + " 0 IN A 0.0.0.0")
rr, err = dns.NewRR(question.Name + " 1 IN A 0.0.0.17")
case dns.TypeAAAA:
rr, err = dns.NewRR(question.Name + " 0 IN AAAA ::")
rr, err = dns.NewRR(question.Name + " 1 IN AAAA ::17")
}
switch {
@ -100,9 +100,9 @@ func Localhost(msgs ...string) ResponderFunc {
switch question.Qtype {
case dns.TypeA:
rr, err = dns.NewRR("localhost. 0 IN A 127.0.0.1")
rr, err = dns.NewRR("localhost. 1 IN A 127.0.0.1")
case dns.TypeAAAA:
rr, err = dns.NewRR("localhost. 0 IN AAAA ::1")
rr, err = dns.NewRR("localhost. 1 IN AAAA ::1")
}
switch {