1106 lines
30 KiB
Go
1106 lines
30 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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"io/ioutil"
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"math/big"
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"net"
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"os"
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"sort"
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"sync"
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"testing"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/util"
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"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
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"github.com/AdguardTeam/AdGuardHome/internal/dnsfilter"
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"github.com/AdguardTeam/dnsproxy/proxy"
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"github.com/AdguardTeam/dnsproxy/upstream"
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"github.com/miekg/dns"
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"github.com/stretchr/testify/assert"
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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 TestServer(t *testing.T) {
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s := createTestServer(t)
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err := s.Start()
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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}
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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{Net: "udp"}
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reply, _, err := client.Exchange(req, addr.String())
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if err != nil {
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t.Fatalf("Couldn't talk to server %s: %s", addr, err)
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}
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assertGoogleAResponse(t, reply)
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// message over TCP
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req = createGoogleATestMessage()
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addr = s.dnsProxy.Addr("tcp")
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client = dns.Client{Net: "tcp"}
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reply, _, err = client.Exchange(req, addr.String())
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if err != nil {
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t.Fatalf("Couldn't talk to server %s: %s", addr, err)
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}
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assertGoogleAResponse(t, reply)
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err = s.Stop()
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if err != nil {
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t.Fatalf("DNS server failed to stop: %s", err)
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}
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}
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func TestServerWithProtectionDisabled(t *testing.T) {
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s := createTestServer(t)
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s.conf.ProtectionEnabled = false
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err := s.Start()
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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}
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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{Net: "udp"}
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reply, _, err := client.Exchange(req, addr.String())
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if err != nil {
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t.Fatalf("Couldn't talk to server %s: %s", addr, err)
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}
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assertGoogleAResponse(t, reply)
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err = s.Stop()
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if err != nil {
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t.Fatalf("DNS server failed to stop: %s", err)
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}
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}
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func TestDotServer(t *testing.T) {
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// Prepare the proxy server
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_, certPem, keyPem := createServerTLSConfig(t)
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s := createTestServer(t)
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s.conf.TLSConfig = TLSConfig{
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TLSListenAddr: &net.TCPAddr{Port: 0},
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CertificateChainData: certPem,
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PrivateKeyData: keyPem,
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}
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_ = s.Prepare(nil)
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// Starting the server
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err := s.Start()
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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}
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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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if err != nil {
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t.Fatalf("cannot connect to the proxy: %s", err)
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}
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sendTestMessages(t, conn)
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// Stop the proxy
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err = s.Stop()
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if err != nil {
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t.Fatalf("DNS server failed to stop: %s", err)
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}
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}
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func TestDoqServer(t *testing.T) {
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// Prepare the proxy server
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_, certPem, keyPem := createServerTLSConfig(t)
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s := createTestServer(t)
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s.conf.TLSConfig = TLSConfig{
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QUICListenAddr: &net.UDPAddr{Port: 0},
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CertificateChainData: certPem,
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PrivateKeyData: keyPem,
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}
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_ = s.Prepare(nil)
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// Starting the server
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err := s.Start()
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assert.Nil(t, err)
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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("quic://%s", addr), opts)
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assert.Nil(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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assert.Nil(t, err)
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assertGoogleAResponse(t, res)
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// Stop the proxy
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err = s.Stop()
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if err != nil {
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t.Fatalf("DNS server failed to stop: %s", err)
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}
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}
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func TestServerRace(t *testing.T) {
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s := createTestServer(t)
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err := s.Start()
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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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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if err != nil {
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t.Fatalf("cannot connect to the proxy: %s", err)
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}
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sendTestMessagesAsync(t, conn)
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// Stop the proxy
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err = s.Stop()
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if err != nil {
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t.Fatalf("DNS server failed to stop: %s", err)
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}
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}
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func TestSafeSearch(t *testing.T) {
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s := createTestServer(t)
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err := s.Start()
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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}
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// Test safe search for yandex. We already know safe search ip
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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client := dns.Client{Net: "udp"}
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yandexDomains := []string{"yandex.com.", "yandex.by.", "yandex.kz.", "yandex.ru.", "yandex.com."}
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for _, host := range yandexDomains {
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exchangeAndAssertResponse(t, &client, addr, host, "213.180.193.56")
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}
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// Let's lookup for google safesearch ip
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ips, err := net.LookupIP("forcesafesearch.google.com")
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if err != nil {
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t.Fatalf("Failed to lookup for forcesafesearch.google.com: %s", err)
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}
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ip := ips[0]
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for _, i := range ips {
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if i.To4() != nil {
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ip = i
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break
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}
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}
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// Test safe search for google.
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googleDomains := []string{"www.google.com.", "www.google.com.af.", "www.google.be.", "www.google.by."}
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for _, host := range googleDomains {
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exchangeAndAssertResponse(t, &client, addr, host, ip.String())
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}
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err = s.Stop()
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if err != nil {
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t.Fatalf("Can not stopd server cause: %s", err)
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}
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}
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func TestInvalidRequest(t *testing.T) {
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s := createTestServer(t)
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err := s.Start()
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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}
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// server is running, send a message
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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req := dns.Msg{}
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req.Id = dns.Id()
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req.RecursionDesired = true
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// send a DNS request without question
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client := dns.Client{Net: "udp", Timeout: 500 * time.Millisecond}
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_, _, err = client.Exchange(&req, addr.String())
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if err != nil {
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t.Fatalf("got a response to an invalid query")
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}
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err = s.Stop()
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if err != nil {
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t.Fatalf("DNS server failed to stop: %s", err)
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}
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}
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func TestBlockedRequest(t *testing.T) {
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s := createTestServer(t)
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err := s.Start()
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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}
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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//
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// Default blocking - NULL IP
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//
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req := dns.Msg{}
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req.Id = dns.Id()
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req.RecursionDesired = true
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req.Question = []dns.Question{
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{Name: "nxdomain.example.org.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
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}
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reply, err := dns.Exchange(&req, addr.String())
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if err != nil {
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t.Fatalf("Couldn't talk to server %s: %s", addr, err)
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}
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assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
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assert.True(t, reply.Answer[0].(*dns.A).A.Equal(net.ParseIP("0.0.0.0")))
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err = s.Stop()
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if err != nil {
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t.Fatalf("DNS server failed to stop: %s", err)
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}
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}
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func TestServerCustomClientUpstream(t *testing.T) {
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s := createTestServer(t)
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s.conf.GetCustomUpstreamByClient = func(clientAddr string) *proxy.UpstreamConfig {
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uc := &proxy.UpstreamConfig{}
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u := &testUpstream{}
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u.ipv4 = map[string][]net.IP{}
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u.ipv4["host."] = []net.IP{net.ParseIP("192.168.0.1")}
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uc.Upstreams = append(uc.Upstreams, u)
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return uc
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}
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assert.Nil(t, s.Start())
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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// Send test request
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req := dns.Msg{}
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req.Id = dns.Id()
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req.RecursionDesired = true
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req.Question = []dns.Question{
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{Name: "host.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
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}
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reply, err := dns.Exchange(&req, addr.String())
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assert.Nil(t, err)
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assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
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assert.NotNil(t, reply.Answer)
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assert.Equal(t, "192.168.0.1", reply.Answer[0].(*dns.A).A.String())
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assert.Nil(t, s.Stop())
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}
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// testUpstream is a mock of real upstream.
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// specify fields with necessary values to simulate real upstream behaviour
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type testUpstream struct {
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cn map[string]string // Map of [name]canonical_name
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ipv4 map[string][]net.IP // Map of [name]IPv4
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ipv6 map[string][]net.IP // Map of [name]IPv6
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}
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func (u *testUpstream) Exchange(m *dns.Msg) (*dns.Msg, error) {
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resp := dns.Msg{}
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resp.SetReply(m)
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hasARecord := false
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hasAAAARecord := false
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reqType := m.Question[0].Qtype
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name := m.Question[0].Name
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// Let's check if we have any CNAME for given name
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if cname, ok := u.cn[name]; ok {
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cn := dns.CNAME{}
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cn.Hdr.Name = name
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cn.Hdr.Rrtype = dns.TypeCNAME
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cn.Target = cname
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resp.Answer = append(resp.Answer, &cn)
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}
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// Let's check if we can add some A records to the answer
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if ipv4addr, ok := u.ipv4[name]; ok && reqType == dns.TypeA {
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hasARecord = true
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for _, ipv4 := range ipv4addr {
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respA := dns.A{}
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respA.Hdr.Rrtype = dns.TypeA
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respA.Hdr.Name = name
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respA.A = ipv4
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resp.Answer = append(resp.Answer, &respA)
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}
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}
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// Let's check if we can add some AAAA records to the answer
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if u.ipv6 != nil {
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if ipv6addr, ok := u.ipv6[name]; ok && reqType == dns.TypeAAAA {
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hasAAAARecord = true
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for _, ipv6 := range ipv6addr {
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respAAAA := dns.A{}
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respAAAA.Hdr.Rrtype = dns.TypeAAAA
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respAAAA.Hdr.Name = name
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respAAAA.A = ipv6
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resp.Answer = append(resp.Answer, &respAAAA)
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}
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}
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}
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if len(resp.Answer) == 0 {
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if hasARecord || hasAAAARecord {
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// Set No Error RCode if there are some records for given Qname but we didn't apply them
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resp.SetRcode(m, dns.RcodeSuccess)
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} else {
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// Set NXDomain RCode otherwise
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resp.SetRcode(m, dns.RcodeNameError)
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}
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}
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return &resp, nil
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}
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func (u *testUpstream) Address() string {
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return "test"
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}
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func (s *Server) startWithUpstream(u upstream.Upstream) error {
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s.Lock()
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defer s.Unlock()
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err := s.Prepare(nil)
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if err != nil {
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return err
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}
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s.dnsProxy.UpstreamConfig = &proxy.UpstreamConfig{
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Upstreams: []upstream.Upstream{u},
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}
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return s.dnsProxy.Start()
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}
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// testCNAMEs is a simple map of names and CNAMEs necessary for the testUpstream work
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var testCNAMEs = map[string]string{
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"badhost.": "null.example.org.",
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"whitelist.example.org.": "null.example.org.",
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}
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// testIPv4 is a simple map of names and IPv4s necessary for the testUpstream work
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var testIPv4 = map[string][]net.IP{
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"null.example.org.": {{1, 2, 3, 4}},
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"example.org.": {{127, 0, 0, 255}},
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}
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func TestBlockCNAMEProtectionEnabled(t *testing.T) {
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s := createTestServer(t)
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testUpstm := &testUpstream{testCNAMEs, testIPv4, nil}
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s.conf.ProtectionEnabled = false
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err := s.startWithUpstream(testUpstm)
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assert.True(t, err == nil)
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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// 'badhost' has a canonical name 'null.example.org' which is blocked by filters:
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// but protection is disabled - response is NOT blocked
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req := createTestMessage("badhost.")
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reply, err := dns.Exchange(req, addr.String())
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assert.Nil(t, err)
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assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
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}
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func TestBlockCNAME(t *testing.T) {
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s := createTestServer(t)
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testUpstm := &testUpstream{testCNAMEs, testIPv4, nil}
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err := s.startWithUpstream(testUpstm)
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assert.True(t, err == nil)
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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// 'badhost' has a canonical name 'null.example.org' which is blocked by filters:
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// response is blocked
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req := createTestMessage("badhost.")
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reply, err := dns.Exchange(req, addr.String())
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assert.Nil(t, err, nil)
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assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
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assert.True(t, reply.Answer[0].(*dns.A).A.Equal(net.ParseIP("0.0.0.0")))
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// 'whitelist.example.org' has a canonical name 'null.example.org' which is blocked by filters
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// but 'whitelist.example.org' is in a whitelist:
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// response isn't blocked
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req = createTestMessage("whitelist.example.org.")
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reply, err = dns.Exchange(req, addr.String())
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assert.Nil(t, err)
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assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
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// 'example.org' has a canonical name 'cname1' with IP 127.0.0.255 which is blocked by filters:
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// response is blocked
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req = createTestMessage("example.org.")
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reply, err = dns.Exchange(req, addr.String())
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assert.Nil(t, err)
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assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
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assert.True(t, reply.Answer[0].(*dns.A).A.Equal(net.ParseIP("0.0.0.0")))
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_ = s.Stop()
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}
|
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|
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func TestClientRulesForCNAMEMatching(t *testing.T) {
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s := createTestServer(t)
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testUpstm := &testUpstream{testCNAMEs, testIPv4, nil}
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s.conf.FilterHandler = func(clientAddr string, settings *dnsfilter.RequestFilteringSettings) {
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settings.FilteringEnabled = false
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}
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err := s.startWithUpstream(testUpstm)
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assert.Nil(t, err)
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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// 'badhost' has a canonical name 'null.example.org' which is blocked by filters:
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// response is blocked
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req := dns.Msg{}
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req.Id = dns.Id()
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req.Question = []dns.Question{
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{Name: "badhost.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
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}
|
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// However, in our case it should not be blocked
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// as filtering is disabled on the client level
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reply, err := dns.Exchange(&req, addr.String())
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assert.Nil(t, err)
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assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
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}
|
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|
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func TestNullBlockedRequest(t *testing.T) {
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s := createTestServer(t)
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s.conf.FilteringConfig.BlockingMode = "null_ip"
|
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err := s.Start()
|
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if err != nil {
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t.Fatalf("Failed to start server: %s", err)
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}
|
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addr := s.dnsProxy.Addr(proxy.ProtoUDP)
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|
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//
|
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// Null filter blocking
|
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//
|
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req := dns.Msg{}
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req.Id = dns.Id()
|
|
req.RecursionDesired = true
|
|
req.Question = []dns.Question{
|
|
{Name: "null.example.org.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
|
|
}
|
|
|
|
reply, err := dns.Exchange(&req, addr.String())
|
|
if err != nil {
|
|
t.Fatalf("Couldn't talk to server %s: %s", addr, err)
|
|
}
|
|
if len(reply.Answer) != 1 {
|
|
t.Fatalf("DNS server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
|
|
}
|
|
if a, ok := reply.Answer[0].(*dns.A); ok {
|
|
if !net.IPv4zero.Equal(a.A) {
|
|
t.Fatalf("DNS server %s returned wrong answer instead of 0.0.0.0: %v", addr, a.A)
|
|
}
|
|
} else {
|
|
t.Fatalf("DNS server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
|
|
}
|
|
|
|
err = s.Stop()
|
|
if err != nil {
|
|
t.Fatalf("DNS server failed to stop: %s", err)
|
|
}
|
|
}
|
|
|
|
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 := []dnsfilter.Filter{{
|
|
ID: 0, Data: []byte(rules),
|
|
}}
|
|
c := dnsfilter.Config{}
|
|
|
|
f := dnsfilter.New(&c, filters)
|
|
s := NewServer(DNSCreateParams{DNSFilter: f})
|
|
conf := ServerConfig{}
|
|
conf.UDPListenAddr = &net.UDPAddr{Port: 0}
|
|
conf.TCPListenAddr = &net.TCPAddr{Port: 0}
|
|
conf.ProtectionEnabled = true
|
|
conf.BlockingMode = "custom_ip"
|
|
conf.BlockingIPv4 = "bad IP"
|
|
conf.UpstreamDNS = []string{"8.8.8.8:53", "8.8.4.4:53"}
|
|
err := s.Prepare(&conf)
|
|
assert.True(t, err != nil) // invalid BlockingIPv4
|
|
|
|
conf.BlockingIPv4 = "0.0.0.1"
|
|
conf.BlockingIPv6 = "::1"
|
|
err = s.Prepare(&conf)
|
|
assert.Nil(t, err)
|
|
err = s.Start()
|
|
assert.Nil(t, err)
|
|
|
|
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
|
|
|
req := createTestMessageWithType("null.example.org.", dns.TypeA)
|
|
reply, err := dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, 1, len(reply.Answer))
|
|
a, ok := reply.Answer[0].(*dns.A)
|
|
assert.True(t, ok)
|
|
assert.Equal(t, "0.0.0.1", a.A.String())
|
|
|
|
req = createTestMessageWithType("null.example.org.", dns.TypeAAAA)
|
|
reply, err = dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, 1, len(reply.Answer))
|
|
a6, ok := reply.Answer[0].(*dns.AAAA)
|
|
assert.True(t, ok)
|
|
assert.Equal(t, "::1", a6.AAAA.String())
|
|
|
|
err = s.Stop()
|
|
if err != nil {
|
|
t.Fatalf("DNS server failed to stop: %s", err)
|
|
}
|
|
}
|
|
|
|
func TestBlockedByHosts(t *testing.T) {
|
|
s := createTestServer(t)
|
|
err := s.Start()
|
|
if err != nil {
|
|
t.Fatalf("Failed to start server: %s", err)
|
|
}
|
|
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
|
|
|
//
|
|
// Hosts blocking
|
|
//
|
|
req := dns.Msg{}
|
|
req.Id = dns.Id()
|
|
req.RecursionDesired = true
|
|
req.Question = []dns.Question{
|
|
{Name: "host.example.org.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
|
|
}
|
|
|
|
reply, err := dns.Exchange(&req, addr.String())
|
|
if err != nil {
|
|
t.Fatalf("Couldn't talk to server %s: %s", addr, err)
|
|
}
|
|
if len(reply.Answer) != 1 {
|
|
t.Fatalf("DNS server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
|
|
}
|
|
if a, ok := reply.Answer[0].(*dns.A); ok {
|
|
if !net.IPv4(127, 0, 0, 1).Equal(a.A) {
|
|
t.Fatalf("DNS server %s returned wrong answer instead of 8.8.8.8: %v", addr, a.A)
|
|
}
|
|
} else {
|
|
t.Fatalf("DNS server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
|
|
}
|
|
|
|
err = s.Stop()
|
|
if err != nil {
|
|
t.Fatalf("DNS server failed to stop: %s", err)
|
|
}
|
|
}
|
|
|
|
func TestBlockedBySafeBrowsing(t *testing.T) {
|
|
s := createTestServer(t)
|
|
err := s.Start()
|
|
if err != nil {
|
|
t.Fatalf("Failed to start server: %s", err)
|
|
}
|
|
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
|
|
|
//
|
|
// Safebrowsing blocking
|
|
//
|
|
req := dns.Msg{}
|
|
req.Id = dns.Id()
|
|
req.RecursionDesired = true
|
|
req.Question = []dns.Question{
|
|
{Name: "wmconvirus.narod.ru.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
|
|
}
|
|
reply, err := dns.Exchange(&req, addr.String())
|
|
if err != nil {
|
|
t.Fatalf("Couldn't talk to server %s: %s", addr, err)
|
|
}
|
|
if len(reply.Answer) != 1 {
|
|
t.Fatalf("DNS server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
|
|
}
|
|
if a, ok := reply.Answer[0].(*dns.A); ok {
|
|
addrs, lookupErr := net.LookupHost(safeBrowsingBlockHost)
|
|
if lookupErr != nil {
|
|
t.Fatalf("cannot resolve %s due to %s", safeBrowsingBlockHost, lookupErr)
|
|
}
|
|
|
|
found := false
|
|
for _, blockAddr := range addrs {
|
|
if blockAddr == a.A.String() {
|
|
found = true
|
|
}
|
|
}
|
|
|
|
if !found {
|
|
t.Fatalf("DNS server %s returned wrong answer: %v", addr, a.A)
|
|
}
|
|
} else {
|
|
t.Fatalf("DNS server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
|
|
}
|
|
|
|
err = s.Stop()
|
|
if err != nil {
|
|
t.Fatalf("DNS server failed to stop: %s", err)
|
|
}
|
|
}
|
|
|
|
func TestRewrite(t *testing.T) {
|
|
c := dnsfilter.Config{}
|
|
c.Rewrites = []dnsfilter.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 := dnsfilter.New(&c, nil)
|
|
s := NewServer(DNSCreateParams{DNSFilter: f})
|
|
conf := ServerConfig{}
|
|
conf.UDPListenAddr = &net.UDPAddr{Port: 0}
|
|
conf.TCPListenAddr = &net.TCPAddr{Port: 0}
|
|
conf.ProtectionEnabled = true
|
|
conf.UpstreamDNS = []string{"8.8.8.8:53"}
|
|
|
|
err := s.Prepare(&conf)
|
|
assert.Nil(t, err)
|
|
err = s.Start()
|
|
assert.Nil(t, err)
|
|
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
|
|
|
req := createTestMessageWithType("test.com.", dns.TypeA)
|
|
reply, err := dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, 1, len(reply.Answer))
|
|
a, ok := reply.Answer[0].(*dns.A)
|
|
assert.True(t, ok)
|
|
assert.Equal(t, "1.2.3.4", a.A.String())
|
|
|
|
req = createTestMessageWithType("test.com.", dns.TypeAAAA)
|
|
reply, err = dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, 0, len(reply.Answer))
|
|
|
|
req = createTestMessageWithType("alias.test.com.", dns.TypeA)
|
|
reply, err = dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, 2, len(reply.Answer))
|
|
assert.Equal(t, "test.com.", reply.Answer[0].(*dns.CNAME).Target)
|
|
assert.Equal(t, "1.2.3.4", reply.Answer[1].(*dns.A).A.String())
|
|
|
|
req = createTestMessageWithType("my.alias.example.org.", dns.TypeA)
|
|
reply, err = dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, "my.alias.example.org.", reply.Question[0].Name) // the original question is restored
|
|
assert.Equal(t, 2, len(reply.Answer))
|
|
assert.Equal(t, "example.org.", reply.Answer[0].(*dns.CNAME).Target)
|
|
assert.Equal(t, dns.TypeA, reply.Answer[1].Header().Rrtype)
|
|
|
|
_ = s.Stop()
|
|
}
|
|
|
|
func createTestServer(t *testing.T) *Server {
|
|
rules := `||nxdomain.example.org
|
|
||null.example.org^
|
|
127.0.0.1 host.example.org
|
|
@@||whitelist.example.org^
|
|
||127.0.0.255`
|
|
filters := []dnsfilter.Filter{{
|
|
ID: 0, Data: []byte(rules),
|
|
}}
|
|
c := dnsfilter.Config{}
|
|
c.SafeBrowsingEnabled = true
|
|
c.SafeBrowsingCacheSize = 1000
|
|
c.SafeSearchEnabled = true
|
|
c.SafeSearchCacheSize = 1000
|
|
c.ParentalCacheSize = 1000
|
|
c.CacheTime = 30
|
|
|
|
f := dnsfilter.New(&c, filters)
|
|
s := NewServer(DNSCreateParams{DNSFilter: f})
|
|
s.conf.UDPListenAddr = &net.UDPAddr{Port: 0}
|
|
s.conf.TCPListenAddr = &net.TCPAddr{Port: 0}
|
|
s.conf.UpstreamDNS = []string{"8.8.8.8:53", "8.8.4.4:53"}
|
|
s.conf.FilteringConfig.ProtectionEnabled = true
|
|
err := s.Prepare(nil)
|
|
assert.True(t, err == nil)
|
|
return s
|
|
}
|
|
|
|
func createServerTLSConfig(t *testing.T) (*tls.Config, []byte, []byte) {
|
|
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
t.Fatalf("cannot generate RSA key: %s", err)
|
|
}
|
|
|
|
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
|
|
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
|
|
if err != nil {
|
|
t.Fatalf("failed to generate serial number: %s", err)
|
|
}
|
|
|
|
notBefore := time.Now()
|
|
notAfter := notBefore.Add(5 * 365 * time.Hour * 24)
|
|
|
|
template := x509.Certificate{
|
|
SerialNumber: serialNumber,
|
|
Subject: pkix.Name{
|
|
Organization: []string{"AdGuard Tests"},
|
|
},
|
|
NotBefore: notBefore,
|
|
NotAfter: notAfter,
|
|
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
|
|
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
|
|
BasicConstraintsValid: true,
|
|
IsCA: true,
|
|
}
|
|
template.DNSNames = append(template.DNSNames, tlsServerName)
|
|
|
|
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(privateKey), privateKey)
|
|
if err != nil {
|
|
t.Fatalf("failed to create certificate: %s", err)
|
|
}
|
|
|
|
certPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
|
|
keyPem := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)})
|
|
|
|
cert, err := tls.X509KeyPair(certPem, keyPem)
|
|
if err != nil {
|
|
t.Fatalf("failed to create certificate: %s", err)
|
|
}
|
|
|
|
return &tls.Config{Certificates: []tls.Certificate{cert}, ServerName: tlsServerName, MinVersion: tls.VersionTLS12}, certPem, keyPem
|
|
}
|
|
|
|
func sendTestMessageAsync(t *testing.T, conn *dns.Conn, g *sync.WaitGroup) {
|
|
defer func() {
|
|
g.Done()
|
|
}()
|
|
|
|
req := createGoogleATestMessage()
|
|
err := conn.WriteMsg(req)
|
|
if err != nil {
|
|
t.Fatalf("cannot write message: %s", err)
|
|
}
|
|
|
|
res, err := conn.ReadMsg()
|
|
if err != nil {
|
|
t.Fatalf("cannot read response to message: %s", err)
|
|
}
|
|
assertGoogleAResponse(t, res)
|
|
}
|
|
|
|
// sendTestMessagesAsync sends messages in parallel
|
|
// so that we could find race issues
|
|
func sendTestMessagesAsync(t *testing.T, conn *dns.Conn) {
|
|
g := &sync.WaitGroup{}
|
|
g.Add(testMessagesCount)
|
|
|
|
for i := 0; i < testMessagesCount; i++ {
|
|
go sendTestMessageAsync(t, conn, g)
|
|
}
|
|
|
|
g.Wait()
|
|
}
|
|
|
|
func sendTestMessages(t *testing.T, conn *dns.Conn) {
|
|
for i := 0; i < 10; i++ {
|
|
req := createGoogleATestMessage()
|
|
err := conn.WriteMsg(req)
|
|
if err != nil {
|
|
t.Fatalf("cannot write message #%d: %s", i, err)
|
|
}
|
|
|
|
res, err := conn.ReadMsg()
|
|
if err != nil {
|
|
t.Fatalf("cannot read response to message #%d: %s", i, err)
|
|
}
|
|
assertGoogleAResponse(t, res)
|
|
}
|
|
}
|
|
|
|
func exchangeAndAssertResponse(t *testing.T, client *dns.Client, addr net.Addr, host, ip string) {
|
|
req := createTestMessage(host)
|
|
reply, _, err := client.Exchange(req, addr.String())
|
|
if err != nil {
|
|
t.Fatalf("Couldn't talk to server %s: %s", addr, err)
|
|
}
|
|
assertResponse(t, reply, ip)
|
|
}
|
|
|
|
func createGoogleATestMessage() *dns.Msg {
|
|
return createTestMessage("google-public-dns-a.google.com.")
|
|
}
|
|
|
|
func createTestMessage(host string) *dns.Msg {
|
|
req := dns.Msg{}
|
|
req.Id = dns.Id()
|
|
req.RecursionDesired = true
|
|
req.Question = []dns.Question{
|
|
{Name: host, Qtype: dns.TypeA, Qclass: dns.ClassINET},
|
|
}
|
|
return &req
|
|
}
|
|
|
|
func createTestMessageWithType(host string, qtype uint16) *dns.Msg {
|
|
req := dns.Msg{}
|
|
req.Id = dns.Id()
|
|
req.RecursionDesired = true
|
|
req.Question = []dns.Question{
|
|
{Name: host, Qtype: qtype, Qclass: dns.ClassINET},
|
|
}
|
|
return &req
|
|
}
|
|
|
|
func assertGoogleAResponse(t *testing.T, reply *dns.Msg) {
|
|
assertResponse(t, reply, "8.8.8.8")
|
|
}
|
|
|
|
func assertResponse(t *testing.T, reply *dns.Msg, ip string) {
|
|
if len(reply.Answer) != 1 {
|
|
t.Fatalf("DNS server returned reply with wrong number of answers - %d", len(reply.Answer))
|
|
}
|
|
if a, ok := reply.Answer[0].(*dns.A); ok {
|
|
if !net.ParseIP(ip).Equal(a.A) {
|
|
t.Fatalf("DNS server returned wrong answer instead of %s: %v", ip, a.A)
|
|
}
|
|
} else {
|
|
t.Fatalf("DNS server returned wrong answer type instead of A: %v", reply.Answer[0])
|
|
}
|
|
}
|
|
|
|
func publicKey(priv interface{}) interface{} {
|
|
switch k := priv.(type) {
|
|
case *rsa.PrivateKey:
|
|
return &k.PublicKey
|
|
case *ecdsa.PrivateKey:
|
|
return &k.PublicKey
|
|
default:
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func TestValidateUpstream(t *testing.T) {
|
|
invalidUpstreams := []string{"1.2.3.4.5",
|
|
"123.3.7m",
|
|
"htttps://google.com/dns-query",
|
|
"[/host.com]tls://dns.adguard.com",
|
|
"[host.ru]#",
|
|
}
|
|
|
|
validDefaultUpstreams := []string{"1.1.1.1",
|
|
"tls://1.1.1.1",
|
|
"https://dns.adguard.com/dns-query",
|
|
"sdns://AQMAAAAAAAAAFDE3Ni4xMDMuMTMwLjEzMDo1NDQzINErR_JS3PLCu_iZEIbq95zkSV2LFsigxDIuUso_OQhzIjIuZG5zY3J5cHQuZGVmYXVsdC5uczEuYWRndWFyZC5jb20",
|
|
}
|
|
|
|
validUpstreams := []string{"[/host.com/]1.1.1.1",
|
|
"[//]tls://1.1.1.1",
|
|
"[/www.host.com/]#",
|
|
"[/host.com/google.com/]8.8.8.8",
|
|
"[/host/]sdns://AQMAAAAAAAAAFDE3Ni4xMDMuMTMwLjEzMDo1NDQzINErR_JS3PLCu_iZEIbq95zkSV2LFsigxDIuUso_OQhzIjIuZG5zY3J5cHQuZGVmYXVsdC5uczEuYWRndWFyZC5jb20",
|
|
}
|
|
for _, u := range invalidUpstreams {
|
|
_, err := validateUpstream(u)
|
|
if err == nil {
|
|
t.Fatalf("upstream %s is invalid but it pass through validation", u)
|
|
}
|
|
}
|
|
|
|
for _, u := range validDefaultUpstreams {
|
|
defaultUpstream, err := validateUpstream(u)
|
|
if err != nil {
|
|
t.Fatalf("upstream %s is valid but it doen't pass through validation cause: %s", u, err)
|
|
}
|
|
if !defaultUpstream {
|
|
t.Fatalf("upstream %s is default one!", u)
|
|
}
|
|
}
|
|
|
|
for _, u := range validUpstreams {
|
|
defaultUpstream, err := validateUpstream(u)
|
|
if err != nil {
|
|
t.Fatalf("upstream %s is valid but it doen't pass through validation cause: %s", u, err)
|
|
}
|
|
if defaultUpstream {
|
|
t.Fatalf("upstream %s is default one!", u)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestValidateUpstreamsSet(t *testing.T) {
|
|
// Empty upstreams array
|
|
var upstreamsSet []string
|
|
err := ValidateUpstreams(upstreamsSet)
|
|
assert.Nil(t, err, "empty upstreams array should be valid")
|
|
|
|
// Comment in upstreams array
|
|
upstreamsSet = []string{"# comment"}
|
|
err = ValidateUpstreams(upstreamsSet)
|
|
assert.Nil(t, err, "comments should not be validated")
|
|
|
|
// Set of valid upstreams. There is no default upstream specified
|
|
upstreamsSet = []string{"[/host.com/]1.1.1.1",
|
|
"[//]tls://1.1.1.1",
|
|
"[/www.host.com/]#",
|
|
"[/host.com/google.com/]8.8.8.8",
|
|
"[/host/]sdns://AQMAAAAAAAAAFDE3Ni4xMDMuMTMwLjEzMDo1NDQzINErR_JS3PLCu_iZEIbq95zkSV2LFsigxDIuUso_OQhzIjIuZG5zY3J5cHQuZGVmYXVsdC5uczEuYWRndWFyZC5jb20",
|
|
}
|
|
err = ValidateUpstreams(upstreamsSet)
|
|
assert.NotNil(t, err, "there is no default upstream")
|
|
|
|
// Let's add default upstream
|
|
upstreamsSet = append(upstreamsSet, "8.8.8.8")
|
|
err = ValidateUpstreams(upstreamsSet)
|
|
assert.Nilf(t, err, "upstreams set is valid, but doesn't pass through validation cause: %s", err)
|
|
|
|
// Let's add invalid upstream
|
|
upstreamsSet = append(upstreamsSet, "dhcp://fake.dns")
|
|
err = ValidateUpstreams(upstreamsSet)
|
|
assert.NotNil(t, err, "there is an invalid upstream in set, but it pass through validation")
|
|
}
|
|
|
|
func TestIpFromAddr(t *testing.T) {
|
|
addr := net.UDPAddr{}
|
|
addr.IP = net.ParseIP("1:2:3::4")
|
|
addr.Port = 12345
|
|
addr.Zone = "eth0"
|
|
a := ipFromAddr(&addr)
|
|
assert.True(t, a == "1:2:3::4")
|
|
|
|
a = ipFromAddr(nil)
|
|
assert.True(t, a == "")
|
|
}
|
|
|
|
func TestMatchDNSName(t *testing.T) {
|
|
dnsNames := []string{"host1", "*.host2", "1.2.3.4"}
|
|
sort.Strings(dnsNames)
|
|
assert.True(t, matchDNSName(dnsNames, "host1"))
|
|
assert.True(t, matchDNSName(dnsNames, "a.host2"))
|
|
assert.True(t, matchDNSName(dnsNames, "b.a.host2"))
|
|
assert.True(t, matchDNSName(dnsNames, "1.2.3.4"))
|
|
assert.True(t, !matchDNSName(dnsNames, "host2"))
|
|
assert.True(t, !matchDNSName(dnsNames, ""))
|
|
assert.True(t, !matchDNSName(dnsNames, "*.host2"))
|
|
}
|
|
|
|
type testDHCP struct {
|
|
}
|
|
|
|
func (d *testDHCP) Leases(flags int) []dhcpd.Lease {
|
|
l := dhcpd.Lease{}
|
|
l.IP = net.ParseIP("127.0.0.1").To4()
|
|
l.HWAddr, _ = net.ParseMAC("aa:aa:aa:aa:aa:aa")
|
|
l.Hostname = "localhost"
|
|
return []dhcpd.Lease{l}
|
|
}
|
|
func (d *testDHCP) SetOnLeaseChanged(onLeaseChanged dhcpd.OnLeaseChangedT) {
|
|
return
|
|
}
|
|
|
|
func TestPTRResponseFromDHCPLeases(t *testing.T) {
|
|
dhcp := &testDHCP{}
|
|
|
|
c := dnsfilter.Config{}
|
|
f := dnsfilter.New(&c, nil)
|
|
s := NewServer(DNSCreateParams{DNSFilter: f, DHCPServer: dhcp})
|
|
s.conf.UDPListenAddr = &net.UDPAddr{Port: 0}
|
|
s.conf.TCPListenAddr = &net.TCPAddr{Port: 0}
|
|
s.conf.UpstreamDNS = []string{"127.0.0.1:53"}
|
|
s.conf.FilteringConfig.ProtectionEnabled = true
|
|
err := s.Prepare(nil)
|
|
assert.True(t, err == nil)
|
|
assert.Nil(t, s.Start())
|
|
|
|
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
|
req := createTestMessage("1.0.0.127.in-addr.arpa.")
|
|
req.Question[0].Qtype = dns.TypePTR
|
|
|
|
resp, err := dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, 1, len(resp.Answer))
|
|
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 := resp.Answer[0].(*dns.PTR)
|
|
assert.Equal(t, "localhost.", ptr.Ptr)
|
|
|
|
s.Close()
|
|
}
|
|
|
|
func TestPTRResponseFromHosts(t *testing.T) {
|
|
c := dnsfilter.Config{
|
|
AutoHosts: &util.AutoHosts{},
|
|
}
|
|
|
|
// Prepare test hosts file
|
|
hf, _ := ioutil.TempFile("", "")
|
|
defer func() { _ = os.Remove(hf.Name()) }()
|
|
defer hf.Close()
|
|
|
|
_, _ = hf.WriteString(" 127.0.0.1 host # comment \n")
|
|
_, _ = hf.WriteString(" ::1 localhost#comment \n")
|
|
|
|
// Init auto hosts
|
|
c.AutoHosts.Init(hf.Name())
|
|
defer c.AutoHosts.Close()
|
|
|
|
f := dnsfilter.New(&c, nil)
|
|
s := NewServer(DNSCreateParams{DNSFilter: f})
|
|
s.conf.UDPListenAddr = &net.UDPAddr{Port: 0}
|
|
s.conf.TCPListenAddr = &net.TCPAddr{Port: 0}
|
|
s.conf.UpstreamDNS = []string{"127.0.0.1:53"}
|
|
s.conf.FilteringConfig.ProtectionEnabled = true
|
|
err := s.Prepare(nil)
|
|
assert.True(t, err == nil)
|
|
assert.Nil(t, s.Start())
|
|
|
|
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
|
|
req := createTestMessage("1.0.0.127.in-addr.arpa.")
|
|
req.Question[0].Qtype = dns.TypePTR
|
|
|
|
resp, err := dns.Exchange(req, addr.String())
|
|
assert.Nil(t, err)
|
|
assert.Equal(t, 1, len(resp.Answer))
|
|
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 := resp.Answer[0].(*dns.PTR)
|
|
assert.Equal(t, "host.", ptr.Ptr)
|
|
|
|
s.Close()
|
|
}
|