694 lines
18 KiB
Go
694 lines
18 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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"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/dnsfilter"
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"github.com/AdguardTeam/dnsproxy/proxy"
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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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dataDir = "testData"
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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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defer removeDataDir(t)
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err := s.Start(nil)
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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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// check query log and stats
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log := s.GetQueryLog()
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assert.Equal(t, 1, len(log), "Log size")
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stats := s.GetStatsTop()
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assert.Equal(t, 1, len(stats.Domains), "Top domains length")
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assert.Equal(t, 0, len(stats.Blocked), "Top blocked length")
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assert.Equal(t, 1, len(stats.Clients), "Top clients length")
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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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// check query log and stats again
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log = s.GetQueryLog()
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assert.Equal(t, 2, len(log), "Log size")
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stats = s.GetStatsTop()
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// Length did not change as we queried the same domain
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assert.Equal(t, 1, len(stats.Domains), "Top domains length")
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assert.Equal(t, 0, len(stats.Blocked), "Top blocked length")
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assert.Equal(t, 1, len(stats.Clients), "Top clients length")
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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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defer removeDataDir(t)
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s.conf.TLSConfig = TLSConfig{
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TLSListenAddr: &net.TCPAddr{Port: 0},
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CertificateChain: string(certPem),
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PrivateKey: string(keyPem),
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}
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// Starting the server
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err := s.Start(nil)
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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 TestServerRace(t *testing.T) {
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s := createTestServer(t)
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defer removeDataDir(t)
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err := s.Start(nil)
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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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s.conf.SafeSearchEnabled = true
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defer removeDataDir(t)
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err := s.Start(nil)
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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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// Check aggregated stats
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assert.Equal(t, s.GetAggregatedStats()["replaced_safesearch"], float64(len(yandexDomains)))
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assert.Equal(t, s.GetAggregatedStats()["blocked_filtering"], float64(len(yandexDomains)))
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assert.Equal(t, s.GetAggregatedStats()["dns_queries"], float64(len(yandexDomains)))
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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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// Check aggregated stats
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assert.Equal(t, s.GetAggregatedStats()["replaced_safesearch"], float64(len(yandexDomains)+len(googleDomains)))
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assert.Equal(t, s.GetAggregatedStats()["blocked_filtering"], float64(len(yandexDomains)+len(googleDomains)))
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assert.Equal(t, s.GetAggregatedStats()["dns_queries"], float64(len(yandexDomains)+len(googleDomains)))
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// Do one more exchange
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exchangeAndAssertResponse(t, &client, addr, "google-public-dns-a.google.com.", "8.8.8.8")
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// Check aggregated stats
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assert.Equal(t, s.GetAggregatedStats()["replaced_safesearch"], float64(len(yandexDomains)+len(googleDomains)))
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assert.Equal(t, s.GetAggregatedStats()["blocked_filtering"], float64(len(yandexDomains)+len(googleDomains)))
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assert.Equal(t, s.GetAggregatedStats()["dns_queries"], float64(len(yandexDomains)+len(googleDomains)+1))
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// Count of blocked domains (there is `yandex.com` duplicate in yandexDomains array)
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blockedCount := len(yandexDomains) - 1 + len(googleDomains)
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assert.Equal(t, len(s.GetStatsTop().Blocked), blockedCount)
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// Count of domains (blocked domains + `google-public-dns-a.google.com`)
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domainsCount := blockedCount + 1
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assert.Equal(t, len(s.GetStatsTop().Domains), domainsCount)
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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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defer removeDataDir(t)
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err := s.Start(nil)
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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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// check query log and stats
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// invalid requests aren't written to the query log
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log := s.GetQueryLog()
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assert.Equal(t, 0, len(log), "Log size")
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stats := s.GetStatsTop()
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assert.Equal(t, 0, len(stats.Domains), "Top domains length")
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assert.Equal(t, 0, len(stats.Blocked), "Top blocked length")
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assert.Equal(t, 0, len(stats.Clients), "Top clients length")
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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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defer removeDataDir(t)
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err := s.Start(nil)
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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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// NXDomain blocking
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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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if reply.Rcode != dns.RcodeNameError {
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t.Fatalf("Wrong response: %s", reply.String())
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}
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// check query log and stats
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log := s.GetQueryLog()
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assert.Equal(t, 1, len(log), "Log size")
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stats := s.GetStatsTop()
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assert.Equal(t, 1, len(stats.Domains), "Top domains length")
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assert.Equal(t, 1, len(stats.Blocked), "Top blocked length")
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assert.Equal(t, 1, len(stats.Clients), "Top clients length")
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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 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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defer removeDataDir(t)
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err := s.Start(nil)
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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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// Null filter blocking
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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: "null.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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if len(reply.Answer) != 1 {
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t.Fatalf("DNS server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
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}
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if a, ok := reply.Answer[0].(*dns.A); ok {
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if !net.IPv4zero.Equal(a.A) {
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t.Fatalf("DNS server %s returned wrong answer instead of 0.0.0.0: %v", addr, a.A)
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}
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} else {
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t.Fatalf("DNS server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
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}
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// check query log and stats
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log := s.GetQueryLog()
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assert.Equal(t, 1, len(log), "Log size")
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stats := s.GetStatsTop()
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assert.Equal(t, 1, len(stats.Domains), "Top domains length")
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assert.Equal(t, 1, len(stats.Blocked), "Top blocked length")
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assert.Equal(t, 1, len(stats.Clients), "Top clients length")
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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 TestBlockedByHosts(t *testing.T) {
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s := createTestServer(t)
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defer removeDataDir(t)
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err := s.Start(nil)
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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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// Hosts blocking
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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: "host.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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if len(reply.Answer) != 1 {
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t.Fatalf("DNS server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
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}
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if a, ok := reply.Answer[0].(*dns.A); ok {
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if !net.IPv4(127, 0, 0, 1).Equal(a.A) {
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t.Fatalf("DNS server %s returned wrong answer instead of 8.8.8.8: %v", addr, a.A)
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}
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} else {
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t.Fatalf("DNS server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
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}
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// check query log and stats
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log := s.GetQueryLog()
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assert.Equal(t, 1, len(log), "Log size")
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stats := s.GetStatsTop()
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assert.Equal(t, 1, len(stats.Domains), "Top domains length")
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assert.Equal(t, 1, len(stats.Blocked), "Top blocked length")
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assert.Equal(t, 1, len(stats.Clients), "Top clients length")
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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 TestBlockedBySafeBrowsing(t *testing.T) {
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s := createTestServer(t)
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defer removeDataDir(t)
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err := s.Start(nil)
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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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// Safebrowsing blocking
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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: "wmconvirus.narod.ru.", 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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if len(reply.Answer) != 1 {
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t.Fatalf("DNS server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
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}
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if a, ok := reply.Answer[0].(*dns.A); ok {
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addrs, lookupErr := net.LookupHost(safeBrowsingBlockHost)
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if lookupErr != nil {
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t.Fatalf("cannot resolve %s due to %s", safeBrowsingBlockHost, lookupErr)
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}
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found := false
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for _, blockAddr := range addrs {
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if blockAddr == a.A.String() {
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found = true
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}
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}
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if !found {
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t.Fatalf("DNS server %s returned wrong answer: %v", addr, a.A)
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}
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} else {
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t.Fatalf("DNS server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
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}
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// check query log and stats
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log := s.GetQueryLog()
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assert.Equal(t, 1, len(log), "Log size")
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stats := s.GetStatsTop()
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assert.Equal(t, 1, len(stats.Domains), "Top domains length")
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assert.Equal(t, 1, len(stats.Blocked), "Top blocked length")
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assert.Equal(t, 1, len(stats.Clients), "Top clients length")
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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 createTestServer(t *testing.T) *Server {
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s := NewServer(createDataDir(t))
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s.conf.UDPListenAddr = &net.UDPAddr{Port: 0}
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s.conf.TCPListenAddr = &net.TCPAddr{Port: 0}
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s.conf.QueryLogEnabled = true
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s.conf.FilteringConfig.FilteringEnabled = true
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s.conf.FilteringConfig.ProtectionEnabled = true
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s.conf.FilteringConfig.SafeBrowsingEnabled = true
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s.conf.Filters = make([]dnsfilter.Filter, 0)
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rules := "||nxdomain.example.org^\n||null.example.org^\n127.0.0.1 host.example.org\n"
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filter := dnsfilter.Filter{ID: 0, Data: []byte(rules)}
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s.conf.Filters = append(s.conf.Filters, filter)
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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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privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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t.Fatalf("cannot generate RSA key: %s", err)
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}
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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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if err != nil {
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t.Fatalf("failed to generate serial number: %s", err)
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}
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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,
|
|
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 createDataDir(t *testing.T) string {
|
|
err := os.MkdirAll(dataDir, 0755)
|
|
if err != nil {
|
|
t.Fatalf("Cannot create %s: %s", dataDir, err)
|
|
}
|
|
return dataDir
|
|
}
|
|
|
|
func removeDataDir(t *testing.T) {
|
|
err := os.RemoveAll(dataDir)
|
|
if err != nil {
|
|
t.Fatalf("Cannot remove %s: %s", dataDir, err)
|
|
}
|
|
}
|
|
|
|
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 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 TestIsBlockedIPAllowed(t *testing.T) {
|
|
s := createTestServer(t)
|
|
s.conf.AllowedClients = []string{"1.1.1.1", "2.2.0.0/16"}
|
|
|
|
err := s.Start(nil)
|
|
defer removeDataDir(t)
|
|
if err != nil {
|
|
t.Fatalf("Failed to start server: %s", err)
|
|
}
|
|
|
|
if s.isBlockedIP("1.1.1.1") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
if !s.isBlockedIP("1.1.1.2") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
if s.isBlockedIP("2.2.1.1") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
if !s.isBlockedIP("2.3.1.1") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
}
|
|
|
|
func TestIsBlockedIPDisallowed(t *testing.T) {
|
|
s := createTestServer(t)
|
|
s.conf.DisallowedClients = []string{"1.1.1.1", "2.2.0.0/16"}
|
|
|
|
err := s.Start(nil)
|
|
defer removeDataDir(t)
|
|
if err != nil {
|
|
t.Fatalf("Failed to start server: %s", err)
|
|
}
|
|
|
|
if !s.isBlockedIP("1.1.1.1") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
if s.isBlockedIP("1.1.1.2") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
if !s.isBlockedIP("2.2.1.1") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
if s.isBlockedIP("2.3.1.1") {
|
|
t.Fatalf("isBlockedIP")
|
|
}
|
|
}
|
|
|
|
func TestIsBlockedIPBlockedDomain(t *testing.T) {
|
|
s := createTestServer(t)
|
|
s.conf.BlockedHosts = []string{"host1", "host2"}
|
|
|
|
err := s.Start(nil)
|
|
defer removeDataDir(t)
|
|
if err != nil {
|
|
t.Fatalf("Failed to start server: %s", err)
|
|
}
|
|
|
|
if !s.isBlockedDomain("host1") {
|
|
t.Fatalf("isBlockedDomain")
|
|
}
|
|
if !s.isBlockedDomain("host2") {
|
|
t.Fatalf("isBlockedDomain")
|
|
}
|
|
if s.isBlockedDomain("host3") {
|
|
t.Fatalf("isBlockedDomain")
|
|
}
|
|
}
|