9bd7294fad
Merge in DNS/adguard-home from mv-netutil to master
Squashed commit of the following:
commit 5698fceed656dca7f8644e7dbd7e1a7fc57a68ce
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Mon Aug 9 15:44:17 2021 +0300
dnsforward: add todos
commit 122fb6e3de658b296931e0f608cf24ef85547666
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Mon Aug 9 14:27:46 2021 +0300
all: mv some utilities to netutil
1267 lines
32 KiB
Go
1267 lines
32 KiB
Go
package dnsforward
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import (
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"crypto/ecdsa"
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"math/big"
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"net"
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"os"
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"sync"
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"testing"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
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"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
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"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
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"github.com/AdguardTeam/AdGuardHome/internal/filtering"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/dnsproxy/upstream"
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"github.com/AdguardTeam/golibs/errors"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestMain(m *testing.M) {
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aghtest.DiscardLogOutput(m)
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}
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const (
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tlsServerName = "testdns.adguard.com"
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testMessagesCount = 10
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)
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func startDeferStop(t *testing.T, s *Server) {
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t.Helper()
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err := s.Start()
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require.NoErrorf(t, err, "failed to start server: %s", err)
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t.Cleanup(func() {
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serr := s.Stop()
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require.NoErrorf(t, serr, "dns server failed to stop: %s", serr)
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})
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}
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func createTestServer(
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t *testing.T,
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filterConf *filtering.Config,
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forwardConf ServerConfig,
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localUps upstream.Upstream,
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) (s *Server) {
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t.Helper()
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rules := `||nxdomain.example.org
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||NULL.example.org^
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127.0.0.1 host.example.org
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@@||whitelist.example.org^
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||127.0.0.255`
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filters := []filtering.Filter{{
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ID: 0, Data: []byte(rules),
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}}
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f := filtering.New(filterConf, filters)
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f.SetEnabled(true)
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snd, err := aghnet.NewSubnetDetector()
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require.NoError(t, err)
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require.NotNil(t, snd)
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s, err = NewServer(DNSCreateParams{
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DHCPServer: &testDHCP{},
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DNSFilter: f,
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SubnetDetector: snd,
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})
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require.NoError(t, err)
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s.conf = forwardConf
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err = s.Prepare(nil)
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require.NoError(t, err)
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s.serverLock.Lock()
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defer s.serverLock.Unlock()
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if localUps != nil {
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s.localResolvers.Config.UpstreamConfig.Upstreams = []upstream.Upstream{localUps}
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s.conf.UsePrivateRDNS = true
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}
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return s
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}
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func createServerTLSConfig(t *testing.T) (*tls.Config, []byte, []byte) {
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t.Helper()
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privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
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require.NoErrorf(t, err, "cannot generate RSA key: %s", err)
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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require.NoErrorf(t, err, "failed to generate serial number: %s", err)
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notBefore := time.Now()
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notAfter := notBefore.Add(5 * 365 * time.Hour * 24)
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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Organization: []string{"AdGuard Tests"},
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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IsCA: true,
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}
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template.DNSNames = append(template.DNSNames, tlsServerName)
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(privateKey), privateKey)
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require.NoErrorf(t, err, "failed to create certificate: %s", err)
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certPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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keyPem := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)})
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cert, err := tls.X509KeyPair(certPem, keyPem)
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require.NoErrorf(t, err, "failed to create certificate: %s", err)
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return &tls.Config{
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Certificates: []tls.Certificate{cert},
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ServerName: tlsServerName,
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MinVersion: tls.VersionTLS12,
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}, certPem, keyPem
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}
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func createTestTLS(t *testing.T, tlsConf TLSConfig) (s *Server, certPem []byte) {
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t.Helper()
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var keyPem []byte
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_, certPem, keyPem = createServerTLSConfig(t)
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s = createTestServer(t, &filtering.Config{}, ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{{}},
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TCPListenAddrs: []*net.TCPAddr{{}},
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}, nil)
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tlsConf.CertificateChainData, tlsConf.PrivateKeyData = certPem, keyPem
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s.conf.TLSConfig = tlsConf
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err := s.Prepare(nil)
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require.NoErrorf(t, err, "failed to prepare server: %s", err)
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return s, certPem
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}
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func createGoogleATestMessage() *dns.Msg {
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return createTestMessage("google-public-dns-a.google.com.")
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}
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func createTestMessage(host string) *dns.Msg {
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return &dns.Msg{
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MsgHdr: dns.MsgHdr{
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Id: dns.Id(),
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RecursionDesired: true,
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},
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Question: []dns.Question{{
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Name: host,
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Qtype: dns.TypeA,
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Qclass: dns.ClassINET,
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}},
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}
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}
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func createTestMessageWithType(host string, qtype uint16) *dns.Msg {
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req := createTestMessage(host)
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req.Question[0].Qtype = qtype
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return req
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}
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func assertGoogleAResponse(t *testing.T, reply *dns.Msg) {
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assertResponse(t, reply, net.IP{8, 8, 8, 8})
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}
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func assertResponse(t *testing.T, reply *dns.Msg, ip net.IP) {
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t.Helper()
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require.Lenf(t, reply.Answer, 1, "dns server returned reply with wrong number of answers - %d", len(reply.Answer))
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a, ok := reply.Answer[0].(*dns.A)
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require.Truef(t, ok, "dns server returned wrong answer type instead of A: %v", reply.Answer[0])
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assert.Truef(t, a.A.Equal(ip), "dns server returned wrong answer instead of %s: %s", ip, a.A)
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}
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// sendTestMessagesAsync sends messages in parallel to check for race issues.
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//
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//lint:ignore U1000 it's called from the function which is skipped for now.
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func sendTestMessagesAsync(t *testing.T, conn *dns.Conn) {
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t.Helper()
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wg := &sync.WaitGroup{}
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for i := 0; i < testMessagesCount; i++ {
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msg := createGoogleATestMessage()
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wg.Add(1)
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go func() {
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defer wg.Done()
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err := conn.WriteMsg(msg)
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require.NoErrorf(t, err, "cannot write message: %s", err)
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res, err := conn.ReadMsg()
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require.NoErrorf(t, err, "cannot read response to message: %s", err)
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assertGoogleAResponse(t, res)
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}()
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}
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wg.Wait()
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}
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func sendTestMessages(t *testing.T, conn *dns.Conn) {
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t.Helper()
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for i := 0; i < testMessagesCount; i++ {
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req := createGoogleATestMessage()
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err := conn.WriteMsg(req)
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assert.NoErrorf(t, err, "cannot write message #%d: %s", i, err)
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res, err := conn.ReadMsg()
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assert.NoErrorf(t, err, "cannot read response to message #%d: %s", i, err)
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assertGoogleAResponse(t, res)
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}
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}
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func TestServer(t *testing.T) {
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s := createTestServer(t, &filtering.Config{}, ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{{}},
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TCPListenAddrs: []*net.TCPAddr{{}},
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}, nil)
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s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
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&aghtest.TestUpstream{
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IPv4: map[string][]net.IP{
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"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
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},
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},
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}
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startDeferStop(t, s)
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testCases := []struct {
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name string
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net string
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proto proxy.Proto
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}{{
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name: "message_over_udp",
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net: "",
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proto: proxy.ProtoUDP,
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}, {
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name: "message_over_tcp",
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net: "tcp",
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proto: proxy.ProtoTCP,
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}}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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addr := s.dnsProxy.Addr(tc.proto)
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client := dns.Client{Net: tc.net}
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reply, _, err := client.Exchange(createGoogleATestMessage(), addr.String())
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require.NoErrorf(t, err, "сouldn't talk to server %s: %s", addr, err)
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assertGoogleAResponse(t, reply)
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})
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}
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}
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func TestServer_timeout(t *testing.T) {
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const timeout time.Duration = time.Second
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t.Run("custom", func(t *testing.T) {
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srvConf := &ServerConfig{
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UpstreamTimeout: timeout,
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}
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s, err := NewServer(DNSCreateParams{})
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require.NoError(t, err)
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err = s.Prepare(srvConf)
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require.NoError(t, err)
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assert.Equal(t, timeout, s.conf.UpstreamTimeout)
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})
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t.Run("default", func(t *testing.T) {
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s, err := NewServer(DNSCreateParams{})
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require.NoError(t, err)
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err = s.Prepare(nil)
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require.NoError(t, err)
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assert.Equal(t, DefaultTimeout, s.conf.UpstreamTimeout)
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})
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}
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func TestServerWithProtectionDisabled(t *testing.T) {
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s := createTestServer(t, &filtering.Config{}, ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{{}},
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TCPListenAddrs: []*net.TCPAddr{{}},
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}, nil)
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s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
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&aghtest.TestUpstream{
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IPv4: map[string][]net.IP{
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"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
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},
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},
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}
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startDeferStop(t, s)
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// Message over UDP.
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req := createGoogleATestMessage()
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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client := &dns.Client{}
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reply, _, err := client.Exchange(req, addr.String())
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require.NoErrorf(t, err, "сouldn't talk to server %s: %s", addr, err)
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assertGoogleAResponse(t, reply)
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}
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func TestDoTServer(t *testing.T) {
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s, certPem := createTestTLS(t, TLSConfig{
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TLSListenAddrs: []*net.TCPAddr{{}},
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})
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s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
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&aghtest.TestUpstream{
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IPv4: map[string][]net.IP{
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"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
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},
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},
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}
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startDeferStop(t, s)
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// Add our self-signed generated config to roots.
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roots := x509.NewCertPool()
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roots.AppendCertsFromPEM(certPem)
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tlsConfig := &tls.Config{
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ServerName: tlsServerName,
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RootCAs: roots,
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MinVersion: tls.VersionTLS12,
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}
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// Create a DNS-over-TLS client connection.
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addr := s.dnsProxy.Addr(proxy.ProtoTLS)
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conn, err := dns.DialWithTLS("tcp-tls", addr.String(), tlsConfig)
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require.NoErrorf(t, err, "cannot connect to the proxy: %s", err)
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sendTestMessages(t, conn)
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}
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func TestDoQServer(t *testing.T) {
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s, _ := createTestTLS(t, TLSConfig{
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QUICListenAddrs: []*net.UDPAddr{{IP: net.IP{127, 0, 0, 1}}},
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})
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s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
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&aghtest.TestUpstream{
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IPv4: map[string][]net.IP{
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"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
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},
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},
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}
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startDeferStop(t, s)
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// Create a DNS-over-QUIC upstream.
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addr := s.dnsProxy.Addr(proxy.ProtoQUIC)
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opts := &upstream.Options{InsecureSkipVerify: true}
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u, err := upstream.AddressToUpstream(fmt.Sprintf("%s://%s", proxy.ProtoQUIC, addr), opts)
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require.NoError(t, err)
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// Send the test message.
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req := createGoogleATestMessage()
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res, err := u.Exchange(req)
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require.NoError(t, err)
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assertGoogleAResponse(t, res)
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}
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func TestServerRace(t *testing.T) {
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t.Skip("TODO(e.burkov): inspect the golibs/cache package for locks")
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filterConf := &filtering.Config{
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SafeBrowsingEnabled: true,
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SafeBrowsingCacheSize: 1000,
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SafeSearchEnabled: true,
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SafeSearchCacheSize: 1000,
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ParentalCacheSize: 1000,
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CacheTime: 30,
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}
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forwardConf := ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{{}},
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TCPListenAddrs: []*net.TCPAddr{{}},
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FilteringConfig: FilteringConfig{
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ProtectionEnabled: true,
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UpstreamDNS: []string{"8.8.8.8:53", "8.8.4.4:53"},
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},
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ConfigModified: func() {},
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}
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s := createTestServer(t, filterConf, forwardConf, nil)
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s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
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&aghtest.TestUpstream{
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IPv4: map[string][]net.IP{
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"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
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},
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},
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}
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startDeferStop(t, s)
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|
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// Message over UDP.
|
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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conn, err := dns.Dial("udp", addr.String())
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require.NoErrorf(t, err, "cannot connect to the proxy: %s", err)
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sendTestMessagesAsync(t, conn)
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}
|
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|
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func TestSafeSearch(t *testing.T) {
|
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resolver := &aghtest.TestResolver{}
|
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filterConf := &filtering.Config{
|
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SafeSearchEnabled: true,
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SafeSearchCacheSize: 1000,
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CacheTime: 30,
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CustomResolver: resolver,
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}
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forwardConf := ServerConfig{
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UDPListenAddrs: []*net.UDPAddr{{}},
|
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TCPListenAddrs: []*net.TCPAddr{{}},
|
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FilteringConfig: FilteringConfig{
|
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ProtectionEnabled: true,
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},
|
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}
|
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s := createTestServer(t, filterConf, forwardConf, nil)
|
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startDeferStop(t, s)
|
||
|
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addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
|
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client := &dns.Client{}
|
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|
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yandexIP := net.IP{213, 180, 193, 56}
|
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googleIP, _ := resolver.HostToIPs("forcesafesearch.google.com")
|
||
|
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testCases := []struct {
|
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host string
|
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want net.IP
|
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}{{
|
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host: "yandex.com.",
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want: yandexIP,
|
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}, {
|
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host: "yandex.by.",
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want: yandexIP,
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}, {
|
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host: "yandex.kz.",
|
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want: yandexIP,
|
||
}, {
|
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host: "yandex.ru.",
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want: yandexIP,
|
||
}, {
|
||
host: "www.google.com.",
|
||
want: googleIP,
|
||
}, {
|
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host: "www.google.com.af.",
|
||
want: googleIP,
|
||
}, {
|
||
host: "www.google.be.",
|
||
want: googleIP,
|
||
}, {
|
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host: "www.google.by.",
|
||
want: googleIP,
|
||
}}
|
||
|
||
for _, tc := range testCases {
|
||
t.Run(tc.host, func(t *testing.T) {
|
||
req := createTestMessage(tc.host)
|
||
|
||
reply, _, err := client.Exchange(req, addr)
|
||
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
|
||
assertResponse(t, reply, tc.want)
|
||
})
|
||
}
|
||
}
|
||
|
||
func TestInvalidRequest(t *testing.T) {
|
||
s := createTestServer(t, &filtering.Config{}, ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
}, nil)
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
|
||
req := dns.Msg{
|
||
MsgHdr: dns.MsgHdr{
|
||
Id: dns.Id(),
|
||
RecursionDesired: true,
|
||
},
|
||
}
|
||
|
||
// Send a DNS request without question.
|
||
_, _, err := (&dns.Client{
|
||
Timeout: 500 * time.Millisecond,
|
||
}).Exchange(&req, addr)
|
||
|
||
assert.NoErrorf(t, err, "got a response to an invalid query")
|
||
}
|
||
|
||
func TestBlockedRequest(t *testing.T) {
|
||
forwardConf := ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
BlockingMode: BlockingModeDefault,
|
||
},
|
||
}
|
||
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
// Default blocking.
|
||
req := createTestMessage("nxdomain.example.org.")
|
||
|
||
reply, err := dns.Exchange(req, addr.String())
|
||
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
|
||
|
||
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
|
||
|
||
require.Len(t, reply.Answer, 1)
|
||
assert.True(t, reply.Answer[0].(*dns.A).A.IsUnspecified())
|
||
}
|
||
|
||
func TestServerCustomClientUpstream(t *testing.T) {
|
||
forwardConf := ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
},
|
||
}
|
||
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
|
||
s.conf.GetCustomUpstreamByClient = func(_ string) (conf *proxy.UpstreamConfig, err error) {
|
||
ups := &aghtest.TestUpstream{
|
||
IPv4: map[string][]net.IP{
|
||
"host.": {{192, 168, 0, 1}},
|
||
},
|
||
}
|
||
|
||
return &proxy.UpstreamConfig{
|
||
Upstreams: []upstream.Upstream{ups},
|
||
}, nil
|
||
}
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
// Send test request.
|
||
req := createTestMessage("host.")
|
||
|
||
reply, err := dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
|
||
require.NotEmpty(t, reply.Answer)
|
||
|
||
require.Len(t, reply.Answer, 1)
|
||
assert.Equal(t, net.IP{192, 168, 0, 1}, reply.Answer[0].(*dns.A).A)
|
||
}
|
||
|
||
// testCNAMEs is a map of names and CNAMEs necessary for the TestUpstream work.
|
||
var testCNAMEs = map[string]string{
|
||
"badhost.": "NULL.example.org.",
|
||
"whitelist.example.org.": "NULL.example.org.",
|
||
}
|
||
|
||
// testIPv4 is a map of names and IPv4s necessary for the TestUpstream work.
|
||
var testIPv4 = map[string][]net.IP{
|
||
"NULL.example.org.": {{1, 2, 3, 4}},
|
||
"example.org.": {{127, 0, 0, 255}},
|
||
}
|
||
|
||
func TestBlockCNAMEProtectionEnabled(t *testing.T) {
|
||
s := createTestServer(t, &filtering.Config{}, ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
}, nil)
|
||
testUpstm := &aghtest.TestUpstream{
|
||
CName: testCNAMEs,
|
||
IPv4: testIPv4,
|
||
IPv6: nil,
|
||
}
|
||
s.conf.ProtectionEnabled = false
|
||
s.dnsProxy.UpstreamConfig = &proxy.UpstreamConfig{
|
||
Upstreams: []upstream.Upstream{testUpstm},
|
||
}
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
// 'badhost' has a canonical name 'NULL.example.org' which should be
|
||
// blocked by filters, but protection is disabled so it is not.
|
||
req := createTestMessage("badhost.")
|
||
|
||
reply, err := dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
|
||
}
|
||
|
||
func TestBlockCNAME(t *testing.T) {
|
||
forwardConf := ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
BlockingMode: BlockingModeDefault,
|
||
},
|
||
}
|
||
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
|
||
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
|
||
&aghtest.TestUpstream{
|
||
CName: testCNAMEs,
|
||
IPv4: testIPv4,
|
||
},
|
||
}
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
|
||
|
||
testCases := []struct {
|
||
host string
|
||
want bool
|
||
}{{
|
||
host: "badhost.",
|
||
// 'badhost' has a canonical name 'NULL.example.org' which is
|
||
// blocked by filters: response is blocked.
|
||
want: true,
|
||
}, {
|
||
host: "whitelist.example.org.",
|
||
// 'whitelist.example.org' has a canonical name
|
||
// 'NULL.example.org' which is blocked by filters
|
||
// but 'whitelist.example.org' is in a whitelist:
|
||
// response isn't blocked.
|
||
want: false,
|
||
}, {
|
||
host: "example.org.",
|
||
// 'example.org' has a canonical name 'cname1' with IP
|
||
// 127.0.0.255 which is blocked by filters: response is blocked.
|
||
want: true,
|
||
}}
|
||
|
||
for _, tc := range testCases {
|
||
t.Run("block_cname_"+tc.host, func(t *testing.T) {
|
||
req := createTestMessage(tc.host)
|
||
|
||
reply, err := dns.Exchange(req, addr)
|
||
require.NoError(t, err)
|
||
|
||
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
|
||
if tc.want {
|
||
require.Len(t, reply.Answer, 1)
|
||
|
||
ans := reply.Answer[0]
|
||
a, ok := ans.(*dns.A)
|
||
require.Truef(t, ok, "got %T", ans)
|
||
|
||
assert.True(t, a.A.IsUnspecified())
|
||
}
|
||
})
|
||
}
|
||
}
|
||
|
||
func TestClientRulesForCNAMEMatching(t *testing.T) {
|
||
forwardConf := ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
FilterHandler: func(_ net.IP, _ string, settings *filtering.Settings) {
|
||
settings.FilteringEnabled = false
|
||
},
|
||
},
|
||
}
|
||
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
|
||
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
|
||
&aghtest.TestUpstream{
|
||
CName: testCNAMEs,
|
||
IPv4: testIPv4,
|
||
},
|
||
}
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
// 'badhost' has a canonical name 'NULL.example.org' which is blocked by
|
||
// filters: response is blocked.
|
||
req := dns.Msg{
|
||
MsgHdr: dns.MsgHdr{
|
||
Id: dns.Id(),
|
||
},
|
||
Question: []dns.Question{{
|
||
Name: "badhost.",
|
||
Qtype: dns.TypeA,
|
||
Qclass: dns.ClassINET,
|
||
}},
|
||
}
|
||
|
||
// However, in our case it should not be blocked as filtering is
|
||
// disabled on the client level.
|
||
reply, err := dns.Exchange(&req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
|
||
}
|
||
|
||
func TestNullBlockedRequest(t *testing.T) {
|
||
forwardConf := ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
BlockingMode: BlockingModeNullIP,
|
||
},
|
||
}
|
||
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
|
||
startDeferStop(t, s)
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
// Nil filter blocking.
|
||
req := dns.Msg{
|
||
MsgHdr: dns.MsgHdr{
|
||
Id: dns.Id(),
|
||
RecursionDesired: true,
|
||
},
|
||
Question: []dns.Question{{
|
||
Name: "NULL.example.org.",
|
||
Qtype: dns.TypeA,
|
||
Qclass: dns.ClassINET,
|
||
}},
|
||
}
|
||
|
||
reply, err := dns.Exchange(&req, addr.String())
|
||
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
|
||
require.Lenf(t, reply.Answer, 1, "dns server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
|
||
a, ok := reply.Answer[0].(*dns.A)
|
||
require.Truef(t, ok, "dns server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
|
||
assert.Truef(t, a.A.IsUnspecified(), "dns server %s returned wrong answer instead of 0.0.0.0: %v", addr, a.A)
|
||
}
|
||
|
||
func TestBlockedCustomIP(t *testing.T) {
|
||
rules := "||nxdomain.example.org^\n||NULL.example.org^\n127.0.0.1 host.example.org\n@@||whitelist.example.org^\n||127.0.0.255\n"
|
||
filters := []filtering.Filter{{
|
||
ID: 0,
|
||
Data: []byte(rules),
|
||
}}
|
||
|
||
snd, err := aghnet.NewSubnetDetector()
|
||
require.NoError(t, err)
|
||
require.NotNil(t, snd)
|
||
|
||
f := filtering.New(&filtering.Config{}, filters)
|
||
var s *Server
|
||
s, err = NewServer(DNSCreateParams{
|
||
DHCPServer: &testDHCP{},
|
||
DNSFilter: f,
|
||
SubnetDetector: snd,
|
||
})
|
||
require.NoError(t, err)
|
||
|
||
conf := &ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
BlockingMode: BlockingModeCustomIP,
|
||
BlockingIPv4: nil,
|
||
UpstreamDNS: []string{"8.8.8.8:53", "8.8.4.4:53"},
|
||
},
|
||
}
|
||
|
||
// Invalid BlockingIPv4.
|
||
err = s.Prepare(conf)
|
||
assert.Error(t, err)
|
||
|
||
conf.BlockingIPv4 = net.IP{0, 0, 0, 1}
|
||
conf.BlockingIPv6 = net.ParseIP("::1")
|
||
|
||
err = s.Prepare(conf)
|
||
require.NoError(t, err)
|
||
|
||
f.SetEnabled(true)
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
req := createTestMessageWithType("NULL.example.org.", dns.TypeA)
|
||
reply, err := dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
require.Len(t, reply.Answer, 1)
|
||
|
||
a, ok := reply.Answer[0].(*dns.A)
|
||
require.True(t, ok)
|
||
|
||
assert.True(t, net.IP{0, 0, 0, 1}.Equal(a.A))
|
||
|
||
req = createTestMessageWithType("NULL.example.org.", dns.TypeAAAA)
|
||
reply, err = dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
require.Len(t, reply.Answer, 1)
|
||
|
||
a6, ok := reply.Answer[0].(*dns.AAAA)
|
||
require.True(t, ok)
|
||
|
||
assert.Equal(t, "::1", a6.AAAA.String())
|
||
}
|
||
|
||
func TestBlockedByHosts(t *testing.T) {
|
||
forwardConf := ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
BlockingMode: BlockingModeDefault,
|
||
},
|
||
}
|
||
|
||
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
|
||
startDeferStop(t, s)
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
// Hosts blocking.
|
||
req := createTestMessage("host.example.org.")
|
||
|
||
reply, err := dns.Exchange(req, addr.String())
|
||
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
|
||
require.Lenf(t, reply.Answer, 1, "dns server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
|
||
a, ok := reply.Answer[0].(*dns.A)
|
||
require.Truef(t, ok, "dns server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
|
||
assert.Equalf(t, net.IP{127, 0, 0, 1}, a.A, "dns server %s returned wrong answer instead of 8.8.8.8: %v", addr, a.A)
|
||
}
|
||
|
||
func TestBlockedBySafeBrowsing(t *testing.T) {
|
||
const hostname = "wmconvirus.narod.ru"
|
||
|
||
sbUps := &aghtest.TestBlockUpstream{
|
||
Hostname: hostname,
|
||
Block: true,
|
||
}
|
||
ans4, _ := (&aghtest.TestResolver{}).HostToIPs(hostname)
|
||
|
||
filterConf := &filtering.Config{
|
||
SafeBrowsingEnabled: true,
|
||
}
|
||
forwardConf := ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
SafeBrowsingBlockHost: ans4.String(),
|
||
ProtectionEnabled: true,
|
||
},
|
||
}
|
||
s := createTestServer(t, filterConf, forwardConf, nil)
|
||
s.dnsFilter.SetSafeBrowsingUpstream(sbUps)
|
||
startDeferStop(t, s)
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
// SafeBrowsing blocking.
|
||
req := createTestMessage(hostname + ".")
|
||
|
||
reply, err := dns.Exchange(req, addr.String())
|
||
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
|
||
require.Lenf(t, reply.Answer, 1, "dns server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
|
||
|
||
a, ok := reply.Answer[0].(*dns.A)
|
||
require.Truef(t, ok, "dns server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
|
||
assert.Equal(t, ans4, a.A, "dns server %s returned wrong answer: %v", addr, a.A)
|
||
}
|
||
|
||
func TestRewrite(t *testing.T) {
|
||
c := &filtering.Config{
|
||
Rewrites: []filtering.RewriteEntry{{
|
||
Domain: "test.com",
|
||
Answer: "1.2.3.4",
|
||
Type: dns.TypeA,
|
||
}, {
|
||
Domain: "alias.test.com",
|
||
Answer: "test.com",
|
||
Type: dns.TypeCNAME,
|
||
}, {
|
||
Domain: "my.alias.example.org",
|
||
Answer: "example.org",
|
||
Type: dns.TypeCNAME,
|
||
}},
|
||
}
|
||
f := filtering.New(c, nil)
|
||
|
||
snd, err := aghnet.NewSubnetDetector()
|
||
require.NoError(t, err)
|
||
require.NotNil(t, snd)
|
||
|
||
var s *Server
|
||
s, err = NewServer(DNSCreateParams{
|
||
DHCPServer: &testDHCP{},
|
||
DNSFilter: f,
|
||
SubnetDetector: snd,
|
||
})
|
||
require.NoError(t, err)
|
||
|
||
assert.NoError(t, s.Prepare(&ServerConfig{
|
||
UDPListenAddrs: []*net.UDPAddr{{}},
|
||
TCPListenAddrs: []*net.TCPAddr{{}},
|
||
FilteringConfig: FilteringConfig{
|
||
ProtectionEnabled: true,
|
||
UpstreamDNS: []string{"8.8.8.8:53"},
|
||
},
|
||
}))
|
||
|
||
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
|
||
&aghtest.TestUpstream{
|
||
CName: map[string]string{
|
||
"example.org": "somename",
|
||
},
|
||
IPv4: map[string][]net.IP{
|
||
"example.org.": {{4, 3, 2, 1}},
|
||
},
|
||
},
|
||
}
|
||
startDeferStop(t, s)
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
|
||
req := createTestMessageWithType("test.com.", dns.TypeA)
|
||
reply, err := dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
require.Len(t, reply.Answer, 1)
|
||
|
||
a, ok := reply.Answer[0].(*dns.A)
|
||
require.True(t, ok)
|
||
|
||
assert.True(t, net.IP{1, 2, 3, 4}.Equal(a.A))
|
||
|
||
req = createTestMessageWithType("test.com.", dns.TypeAAAA)
|
||
reply, err = dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
assert.Empty(t, reply.Answer)
|
||
|
||
req = createTestMessageWithType("alias.test.com.", dns.TypeA)
|
||
reply, err = dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
require.Len(t, reply.Answer, 2)
|
||
|
||
assert.Equal(t, "test.com.", reply.Answer[0].(*dns.CNAME).Target)
|
||
assert.True(t, net.IP{1, 2, 3, 4}.Equal(reply.Answer[1].(*dns.A).A))
|
||
|
||
req = createTestMessageWithType("my.alias.example.org.", dns.TypeA)
|
||
reply, err = dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
// The original question is restored.
|
||
require.Len(t, reply.Question, 1)
|
||
|
||
assert.Equal(t, "my.alias.example.org.", reply.Question[0].Name)
|
||
|
||
require.Len(t, reply.Answer, 2)
|
||
|
||
assert.Equal(t, "example.org.", reply.Answer[0].(*dns.CNAME).Target)
|
||
assert.Equal(t, dns.TypeA, reply.Answer[1].Header().Rrtype)
|
||
}
|
||
|
||
func publicKey(priv interface{}) interface{} {
|
||
switch k := priv.(type) {
|
||
case *rsa.PrivateKey:
|
||
return &k.PublicKey
|
||
|
||
case *ecdsa.PrivateKey:
|
||
return &k.PublicKey
|
||
|
||
default:
|
||
return nil
|
||
}
|
||
}
|
||
|
||
type testDHCP struct{}
|
||
|
||
func (d *testDHCP) Enabled() (ok bool) { return true }
|
||
|
||
func (d *testDHCP) Leases(flags dhcpd.GetLeasesFlags) (leases []*dhcpd.Lease) {
|
||
return []*dhcpd.Lease{{
|
||
IP: net.IP{192, 168, 12, 34},
|
||
HWAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
|
||
Hostname: "myhost",
|
||
}}
|
||
}
|
||
|
||
func (d *testDHCP) SetOnLeaseChanged(onLeaseChanged dhcpd.OnLeaseChangedT) {}
|
||
|
||
func TestPTRResponseFromDHCPLeases(t *testing.T) {
|
||
snd, err := aghnet.NewSubnetDetector()
|
||
require.NoError(t, err)
|
||
require.NotNil(t, snd)
|
||
|
||
var s *Server
|
||
s, err = NewServer(DNSCreateParams{
|
||
DNSFilter: filtering.New(&filtering.Config{}, nil),
|
||
DHCPServer: &testDHCP{},
|
||
SubnetDetector: snd,
|
||
})
|
||
require.NoError(t, err)
|
||
|
||
s.conf.UDPListenAddrs = []*net.UDPAddr{{}}
|
||
s.conf.TCPListenAddrs = []*net.TCPAddr{{}}
|
||
s.conf.UpstreamDNS = []string{"127.0.0.1:53"}
|
||
s.conf.FilteringConfig.ProtectionEnabled = true
|
||
|
||
err = s.Prepare(nil)
|
||
require.NoError(t, err)
|
||
|
||
err = s.Start()
|
||
require.NoError(t, err)
|
||
|
||
t.Cleanup(func() {
|
||
s.Close()
|
||
})
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
req := createTestMessageWithType("34.12.168.192.in-addr.arpa.", dns.TypePTR)
|
||
|
||
resp, err := dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
require.Len(t, resp.Answer, 1)
|
||
|
||
assert.Equal(t, dns.TypePTR, resp.Answer[0].Header().Rrtype)
|
||
assert.Equal(t, "34.12.168.192.in-addr.arpa.", resp.Answer[0].Header().Name)
|
||
|
||
ptr, ok := resp.Answer[0].(*dns.PTR)
|
||
require.True(t, ok)
|
||
assert.Equal(t, "myhost.", ptr.Ptr)
|
||
}
|
||
|
||
func TestPTRResponseFromHosts(t *testing.T) {
|
||
c := filtering.Config{
|
||
EtcHosts: &aghnet.EtcHostsContainer{},
|
||
}
|
||
|
||
// Prepare test hosts file.
|
||
hf, err := os.CreateTemp("", "")
|
||
require.NoError(t, err)
|
||
t.Cleanup(func() {
|
||
assert.NoError(t, hf.Close())
|
||
assert.NoError(t, os.Remove(hf.Name()))
|
||
})
|
||
|
||
_, _ = hf.WriteString(" 127.0.0.1 host # comment \n")
|
||
_, _ = hf.WriteString(" ::1 localhost#comment \n")
|
||
|
||
c.EtcHosts.Init(hf.Name())
|
||
t.Cleanup(c.EtcHosts.Close)
|
||
|
||
var snd *aghnet.SubnetDetector
|
||
snd, err = aghnet.NewSubnetDetector()
|
||
require.NoError(t, err)
|
||
require.NotNil(t, snd)
|
||
|
||
var s *Server
|
||
s, err = NewServer(DNSCreateParams{
|
||
DHCPServer: &testDHCP{},
|
||
DNSFilter: filtering.New(&c, nil),
|
||
SubnetDetector: snd,
|
||
})
|
||
require.NoError(t, err)
|
||
|
||
s.conf.UDPListenAddrs = []*net.UDPAddr{{}}
|
||
s.conf.TCPListenAddrs = []*net.TCPAddr{{}}
|
||
s.conf.UpstreamDNS = []string{"127.0.0.1:53"}
|
||
s.conf.FilteringConfig.ProtectionEnabled = true
|
||
|
||
err = s.Prepare(nil)
|
||
require.NoError(t, err)
|
||
|
||
err = s.Start()
|
||
require.NoError(t, err)
|
||
|
||
t.Cleanup(func() {
|
||
s.Close()
|
||
})
|
||
|
||
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
||
req := createTestMessageWithType("1.0.0.127.in-addr.arpa.", dns.TypePTR)
|
||
|
||
resp, err := dns.Exchange(req, addr.String())
|
||
require.NoError(t, err)
|
||
|
||
require.Len(t, resp.Answer, 1)
|
||
|
||
assert.Equal(t, dns.TypePTR, resp.Answer[0].Header().Rrtype)
|
||
assert.Equal(t, "1.0.0.127.in-addr.arpa.", resp.Answer[0].Header().Name)
|
||
|
||
ptr, ok := resp.Answer[0].(*dns.PTR)
|
||
require.True(t, ok)
|
||
assert.Equal(t, "host.", ptr.Ptr)
|
||
}
|
||
|
||
func TestNewServer(t *testing.T) {
|
||
// TODO(a.garipov): Consider moving away from the text-based error
|
||
// checks and onto a more structured approach.
|
||
testCases := []struct {
|
||
name string
|
||
in DNSCreateParams
|
||
wantErrMsg string
|
||
}{{
|
||
name: "success",
|
||
in: DNSCreateParams{},
|
||
wantErrMsg: "",
|
||
}, {
|
||
name: "success_local_tld",
|
||
in: DNSCreateParams{
|
||
LocalDomain: "mynet",
|
||
},
|
||
wantErrMsg: "",
|
||
}, {
|
||
name: "success_local_domain",
|
||
in: DNSCreateParams{
|
||
LocalDomain: "my.local.net",
|
||
},
|
||
wantErrMsg: "",
|
||
}, {
|
||
name: "bad_local_domain",
|
||
in: DNSCreateParams{
|
||
LocalDomain: "!!!",
|
||
},
|
||
wantErrMsg: `local domain: bad domain name "!!!": ` +
|
||
`bad domain name label "!!!": bad domain name label rune '!'`,
|
||
}}
|
||
|
||
for _, tc := range testCases {
|
||
t.Run(tc.name, func(t *testing.T) {
|
||
_, err := NewServer(tc.in)
|
||
if tc.wantErrMsg == "" {
|
||
assert.NoError(t, err)
|
||
} else {
|
||
require.Error(t, err)
|
||
assert.Equal(t, tc.wantErrMsg, err.Error())
|
||
}
|
||
})
|
||
}
|
||
}
|
||
|
||
func TestServer_Exchange(t *testing.T) {
|
||
extUpstream := &aghtest.TestUpstream{
|
||
Reverse: map[string][]string{
|
||
"1.1.1.1.in-addr.arpa.": {"one.one.one.one"},
|
||
},
|
||
}
|
||
locUpstream := &aghtest.TestUpstream{
|
||
Reverse: map[string][]string{
|
||
"1.1.168.192.in-addr.arpa.": {"local.domain"},
|
||
"2.1.168.192.in-addr.arpa.": {},
|
||
},
|
||
}
|
||
upstreamErr := errors.Error("upstream error")
|
||
errUpstream := &aghtest.TestErrUpstream{
|
||
Err: upstreamErr,
|
||
}
|
||
nonPtrUpstream := &aghtest.TestBlockUpstream{
|
||
Hostname: "some-host",
|
||
Block: true,
|
||
}
|
||
|
||
srv := NewCustomServer(&proxy.Proxy{
|
||
Config: proxy.Config{
|
||
UpstreamConfig: &proxy.UpstreamConfig{
|
||
Upstreams: []upstream.Upstream{extUpstream},
|
||
},
|
||
},
|
||
})
|
||
srv.conf.ResolveClients = true
|
||
srv.conf.UsePrivateRDNS = true
|
||
|
||
var err error
|
||
srv.subnetDetector, err = aghnet.NewSubnetDetector()
|
||
require.NoError(t, err)
|
||
|
||
localIP := net.IP{192, 168, 1, 1}
|
||
testCases := []struct {
|
||
name string
|
||
want string
|
||
wantErr error
|
||
locUpstream upstream.Upstream
|
||
req net.IP
|
||
}{{
|
||
name: "external_good",
|
||
want: "one.one.one.one",
|
||
wantErr: nil,
|
||
locUpstream: nil,
|
||
req: net.IP{1, 1, 1, 1},
|
||
}, {
|
||
name: "local_good",
|
||
want: "local.domain",
|
||
wantErr: nil,
|
||
locUpstream: locUpstream,
|
||
req: localIP,
|
||
}, {
|
||
name: "upstream_error",
|
||
want: "",
|
||
wantErr: upstreamErr,
|
||
locUpstream: errUpstream,
|
||
req: localIP,
|
||
}, {
|
||
name: "empty_answer_error",
|
||
want: "",
|
||
wantErr: rDNSEmptyAnswerErr,
|
||
locUpstream: locUpstream,
|
||
req: net.IP{192, 168, 1, 2},
|
||
}, {
|
||
name: "not_ptr_error",
|
||
want: "",
|
||
wantErr: rDNSNotPTRErr,
|
||
locUpstream: nonPtrUpstream,
|
||
req: localIP,
|
||
}}
|
||
|
||
for _, tc := range testCases {
|
||
pcfg := proxy.Config{
|
||
UpstreamConfig: &proxy.UpstreamConfig{
|
||
Upstreams: []upstream.Upstream{tc.locUpstream},
|
||
},
|
||
}
|
||
srv.localResolvers = &proxy.Proxy{
|
||
Config: pcfg,
|
||
}
|
||
|
||
t.Run(tc.name, func(t *testing.T) {
|
||
host, eerr := srv.Exchange(tc.req)
|
||
|
||
require.ErrorIs(t, eerr, tc.wantErr)
|
||
assert.Equal(t, tc.want, host)
|
||
})
|
||
}
|
||
|
||
t.Run("resolving_disabled", func(t *testing.T) {
|
||
srv.conf.UsePrivateRDNS = false
|
||
|
||
host, eerr := srv.Exchange(localIP)
|
||
|
||
require.NoError(t, eerr)
|
||
assert.Empty(t, host)
|
||
})
|
||
}
|