package acl
import (
"context"
"testing"
"github.com/coredns/caddy"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
)
type testResponseWriter struct {
test.ResponseWriter
Rcode int
}
func (t *testResponseWriter) setRemoteIP(ip string) {
t.RemoteIP = ip
}
// WriteMsg implement dns.ResponseWriter interface.
func (t *testResponseWriter) WriteMsg(m *dns.Msg) error {
t.Rcode = m.Rcode
return nil
}
func NewTestControllerWithZones(input string, zones []string) *caddy.Controller {
ctr := caddy.NewTestController("dns", input)
ctr.ServerBlockKeys = append(ctr.ServerBlockKeys, zones...)
return ctr
}
func TestACLServeDNS(t *testing.T) {
type args struct {
domain string
sourceIP string
qtype uint16
}
tests := []struct {
name string
config string
zones []string
args args
wantRcode int
wantErr bool
}{
// IPv4 tests.
{
"Blacklist 1 BLOCKED",
`acl example.org {
block type A net 192.168.0.0/16
}`,
[]string{},
args{
"www.example.org.",
"192.168.0.2",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Blacklist 1 ALLOWED",
`acl example.org {
block type A net 192.168.0.0/16
}`,
[]string{},
args{
"www.example.org.",
"192.167.0.2",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Blacklist 2 BLOCKED",
`
acl example.org {
block type * net 192.168.0.0/16
}`,
[]string{},
args{
"www.example.org.",
"192.168.0.2",
dns.TypeAAAA,
},
dns.RcodeRefused,
false,
},
{
"Blacklist 3 BLOCKED",
`acl example.org {
block type A
}`,
[]string{},
args{
"www.example.org.",
"10.1.0.2",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Blacklist 3 ALLOWED",
`acl example.org {
block type A
}`,
[]string{},
args{
"www.example.org.",
"10.1.0.2",
dns.TypeAAAA,
},
dns.RcodeSuccess,
false,
},
{
"Blacklist 4 Single IP BLOCKED",
`acl example.org {
block type A net 192.168.1.2
}`,
[]string{},
args{
"www.example.org.",
"192.168.1.2",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Blacklist 4 Single IP ALLOWED",
`acl example.org {
block type A net 192.168.1.2
}`,
[]string{},
args{
"www.example.org.",
"192.168.1.3",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Filter 1 FILTERED",
`acl example.org {
filter type A net 192.168.0.0/16
}`,
[]string{},
args{
"www.example.org.",
"192.168.0.2",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Filter 1 ALLOWED",
`acl example.org {
filter type A net 192.168.0.0/16
}`,
[]string{},
args{
"www.example.org.",
"192.167.0.2",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Whitelist 1 ALLOWED",
`acl example.org {
allow net 192.168.0.0/16
block
}`,
[]string{},
args{
"www.example.org.",
"192.168.0.2",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Whitelist 1 REFUSED",
`acl example.org {
allow type * net 192.168.0.0/16
block
}`,
[]string{},
args{
"www.example.org.",
"10.1.0.2",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Fine-Grained 1 REFUSED",
`acl a.example.org {
block type * net 192.168.1.0/24
}`,
[]string{"example.org"},
args{
"a.example.org.",
"192.168.1.2",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Fine-Grained 1 ALLOWED",
`acl a.example.org {
block net 192.168.1.0/24
}`,
[]string{"example.org"},
args{
"www.example.org.",
"192.168.1.2",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Fine-Grained 2 REFUSED",
`acl {
block net 192.168.1.0/24
}`,
[]string{"example.org"},
args{
"a.example.org.",
"192.168.1.2",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Fine-Grained 2 ALLOWED",
`acl {
block net 192.168.1.0/24
}`,
[]string{"example.org"},
args{
"a.example.com.",
"192.168.1.2",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Fine-Grained 3 REFUSED",
`acl a.example.org {
block net 192.168.1.0/24
}
acl b.example.org {
block type * net 192.168.2.0/24
}`,
[]string{"example.org"},
args{
"b.example.org.",
"192.168.2.2",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Fine-Grained 3 ALLOWED",
`acl a.example.org {
block net 192.168.1.0/24
}
acl b.example.org {
block net 192.168.2.0/24
}`,
[]string{"example.org"},
args{
"b.example.org.",
"192.168.1.2",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
// IPv6 tests.
{
"Blacklist 1 BLOCKED IPv6",
`acl example.org {
block type A net 2001:db8:abcd:0012::0/64
}`,
[]string{},
args{
"www.example.org.",
"2001:db8:abcd:0012::1230",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Blacklist 1 ALLOWED IPv6",
`acl example.org {
block type A net 2001:db8:abcd:0012::0/64
}`,
[]string{},
args{
"www.example.org.",
"2001:db8:abcd:0013::0",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Blacklist 2 BLOCKED IPv6",
`acl example.org {
block type A
}`,
[]string{},
args{
"www.example.org.",
"2001:0db8:85a3:0000:0000:8a2e:0370:7334",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Blacklist 3 Single IP BLOCKED IPv6",
`acl example.org {
block type A net 2001:0db8:85a3:0000:0000:8a2e:0370:7334
}`,
[]string{},
args{
"www.example.org.",
"2001:0db8:85a3:0000:0000:8a2e:0370:7334",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Blacklist 3 Single IP ALLOWED IPv6",
`acl example.org {
block type A net 2001:0db8:85a3:0000:0000:8a2e:0370:7334
}`,
[]string{},
args{
"www.example.org.",
"2001:0db8:85a3:0000:0000:8a2e:0370:7335",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
{
"Fine-Grained 1 REFUSED IPv6",
`acl a.example.org {
block type * net 2001:db8:abcd:0012::0/64
}`,
[]string{"example.org"},
args{
"a.example.org.",
"2001:db8:abcd:0012:2019::0",
dns.TypeA,
},
dns.RcodeRefused,
false,
},
{
"Fine-Grained 1 ALLOWED IPv6",
`acl a.example.org {
block net 2001:db8:abcd:0012::0/64
}`,
[]string{"example.org"},
args{
"www.example.org.",
"2001:db8:abcd:0012:2019::0",
dns.TypeA,
},
dns.RcodeSuccess,
false,
},
}
ctx := context.Background()
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
ctr := NewTestControllerWithZones(tt.config, tt.zones)
a, err := parse(ctr)
a.Next = test.NextHandler(dns.RcodeSuccess, nil)
if err != nil {
t.Errorf("Error: Cannot parse acl from config: %v", err)
return
}
w := &testResponseWriter{}
m := new(dns.Msg)
w.setRemoteIP(tt.args.sourceIP)
m.SetQuestion(tt.args.domain, tt.args.qtype)
_, err = a.ServeDNS(ctx, w, m)
if (err != nil) != tt.wantErr {
t.Errorf("Error: acl.ServeDNS() error = %v, wantErr %v", err, tt.wantErr)
return
}
if w.Rcode != tt.wantRcode {
t.Errorf("Error: acl.ServeDNS() Rcode = %v, want %v", w.Rcode, tt.wantRcode)
}
})
}
}