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dnsforward_test.go
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dnsforward_test.go
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package dnsforward
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"net"
"sync"
"sync/atomic"
"testing"
"testing/fstest"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/aghalg"
"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
"github.com/AdguardTeam/AdGuardHome/internal/dhcpd"
"github.com/AdguardTeam/AdGuardHome/internal/filtering"
"github.com/AdguardTeam/dnsproxy/proxy"
"github.com/AdguardTeam/dnsproxy/upstream"
"github.com/AdguardTeam/golibs/netutil"
"github.com/AdguardTeam/golibs/testutil"
"github.com/AdguardTeam/golibs/timeutil"
"github.com/miekg/dns"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestMain(m *testing.M) {
testutil.DiscardLogOutput(m)
}
const (
tlsServerName = "testdns.adguard.com"
testMessagesCount = 10
)
func startDeferStop(t *testing.T, s *Server) {
t.Helper()
err := s.Start()
require.NoErrorf(t, err, "failed to start server: %s", err)
testutil.CleanupAndRequireSuccess(t, s.Stop)
}
func createTestServer(
t *testing.T,
filterConf *filtering.Config,
forwardConf ServerConfig,
localUps upstream.Upstream,
) (s *Server) {
t.Helper()
rules := `||nxdomain.example.org
||NULL.example.org^
127.0.0.1 host.example.org
@@||whitelist.example.org^
||127.0.0.255`
filters := []filtering.Filter{{
ID: 0, Data: []byte(rules),
}}
f, err := filtering.New(filterConf, filters)
require.NoError(t, err)
f.SetEnabled(true)
s, err = NewServer(DNSCreateParams{
DHCPServer: testDHCP,
DNSFilter: f,
PrivateNets: netutil.SubnetSetFunc(netutil.IsLocallyServed),
})
require.NoError(t, err)
if forwardConf.BlockingMode == "" {
forwardConf.BlockingMode = BlockingModeDefault
}
err = s.Prepare(&forwardConf)
require.NoError(t, err)
s.serverLock.Lock()
defer s.serverLock.Unlock()
if localUps != nil {
s.localResolvers.UpstreamConfig.Upstreams = []upstream.Upstream{localUps}
s.conf.UsePrivateRDNS = true
}
return s
}
func createServerTLSConfig(t *testing.T) (*tls.Config, []byte, []byte) {
t.Helper()
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
require.NoErrorf(t, err, "cannot generate RSA key: %s", err)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
require.NoErrorf(t, err, "failed to generate serial number: %s", err)
notBefore := time.Now()
notAfter := notBefore.Add(5 * 365 * timeutil.Day)
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)
require.NoErrorf(t, err, "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)
require.NoErrorf(t, err, "failed to create certificate: %s", err)
return &tls.Config{
Certificates: []tls.Certificate{cert},
ServerName: tlsServerName,
MinVersion: tls.VersionTLS12,
}, certPem, keyPem
}
func createTestTLS(t *testing.T, tlsConf TLSConfig) (s *Server, certPem []byte) {
t.Helper()
var keyPem []byte
_, certPem, keyPem = createServerTLSConfig(t)
s = createTestServer(t, &filtering.Config{}, ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
}, nil)
tlsConf.CertificateChainData, tlsConf.PrivateKeyData = certPem, keyPem
s.conf.TLSConfig = tlsConf
err := s.Prepare(&s.conf)
require.NoErrorf(t, err, "failed to prepare server: %s", err)
return s, certPem
}
func createGoogleATestMessage() *dns.Msg {
return createTestMessage("google-public-dns-a.google.com.")
}
func createTestMessage(host string) *dns.Msg {
return &dns.Msg{
MsgHdr: dns.MsgHdr{
Id: dns.Id(),
RecursionDesired: true,
},
Question: []dns.Question{{
Name: host,
Qtype: dns.TypeA,
Qclass: dns.ClassINET,
}},
}
}
func createTestMessageWithType(host string, qtype uint16) *dns.Msg {
req := createTestMessage(host)
req.Question[0].Qtype = qtype
return req
}
func assertGoogleAResponse(t *testing.T, reply *dns.Msg) {
assertResponse(t, reply, net.IP{8, 8, 8, 8})
}
func assertResponse(t *testing.T, reply *dns.Msg, ip net.IP) {
t.Helper()
require.Lenf(t, reply.Answer, 1, "dns server returned reply with wrong number of answers - %d", len(reply.Answer))
a, ok := reply.Answer[0].(*dns.A)
require.Truef(t, ok, "dns server returned wrong answer type instead of A: %v", reply.Answer[0])
assert.Truef(t, a.A.Equal(ip), "dns server returned wrong answer instead of %s: %s", ip, a.A)
}
// sendTestMessagesAsync sends messages in parallel to check for race issues.
//
//lint:ignore U1000 it's called from the function which is skipped for now.
func sendTestMessagesAsync(t *testing.T, conn *dns.Conn) {
t.Helper()
wg := &sync.WaitGroup{}
for i := 0; i < testMessagesCount; i++ {
msg := createGoogleATestMessage()
wg.Add(1)
go func() {
defer wg.Done()
err := conn.WriteMsg(msg)
require.NoErrorf(t, err, "cannot write message: %s", err)
res, err := conn.ReadMsg()
require.NoErrorf(t, err, "cannot read response to message: %s", err)
assertGoogleAResponse(t, res)
}()
}
wg.Wait()
}
func sendTestMessages(t *testing.T, conn *dns.Conn) {
t.Helper()
for i := 0; i < testMessagesCount; i++ {
req := createGoogleATestMessage()
err := conn.WriteMsg(req)
assert.NoErrorf(t, err, "cannot write message #%d: %s", i, err)
res, err := conn.ReadMsg()
assert.NoErrorf(t, err, "cannot read response to message #%d: %s", i, err)
assertGoogleAResponse(t, res)
}
}
func TestServer(t *testing.T) {
s := createTestServer(t, &filtering.Config{}, ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
}, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
IPv4: map[string][]net.IP{
"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
},
},
}
startDeferStop(t, s)
testCases := []struct {
name string
net string
proto proxy.Proto
}{{
name: "message_over_udp",
net: "",
proto: proxy.ProtoUDP,
}, {
name: "message_over_tcp",
net: "tcp",
proto: proxy.ProtoTCP,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
addr := s.dnsProxy.Addr(tc.proto)
client := dns.Client{Net: tc.net}
reply, _, err := client.Exchange(createGoogleATestMessage(), addr.String())
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
assertGoogleAResponse(t, reply)
})
}
}
func TestServer_timeout(t *testing.T) {
const timeout time.Duration = time.Second
t.Run("custom", func(t *testing.T) {
srvConf := &ServerConfig{
UpstreamTimeout: timeout,
FilteringConfig: FilteringConfig{
BlockingMode: BlockingModeDefault,
},
}
s, err := NewServer(DNSCreateParams{})
require.NoError(t, err)
err = s.Prepare(srvConf)
require.NoError(t, err)
assert.Equal(t, timeout, s.conf.UpstreamTimeout)
})
t.Run("default", func(t *testing.T) {
s, err := NewServer(DNSCreateParams{})
require.NoError(t, err)
s.conf.FilteringConfig.BlockingMode = BlockingModeDefault
err = s.Prepare(&s.conf)
require.NoError(t, err)
assert.Equal(t, DefaultTimeout, s.conf.UpstreamTimeout)
})
}
func TestServerWithProtectionDisabled(t *testing.T) {
s := createTestServer(t, &filtering.Config{}, ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
}, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
IPv4: map[string][]net.IP{
"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
},
},
}
startDeferStop(t, s)
// Message over UDP.
req := createGoogleATestMessage()
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
client := &dns.Client{}
reply, _, err := client.Exchange(req, addr.String())
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
assertGoogleAResponse(t, reply)
}
func TestDoTServer(t *testing.T) {
s, certPem := createTestTLS(t, TLSConfig{
TLSListenAddrs: []*net.TCPAddr{{}},
})
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
IPv4: map[string][]net.IP{
"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
},
},
}
startDeferStop(t, s)
// Add our self-signed generated config to roots.
roots := x509.NewCertPool()
roots.AppendCertsFromPEM(certPem)
tlsConfig := &tls.Config{
ServerName: tlsServerName,
RootCAs: roots,
MinVersion: tls.VersionTLS12,
}
// Create a DNS-over-TLS client connection.
addr := s.dnsProxy.Addr(proxy.ProtoTLS)
conn, err := dns.DialWithTLS("tcp-tls", addr.String(), tlsConfig)
require.NoErrorf(t, err, "cannot connect to the proxy: %s", err)
sendTestMessages(t, conn)
}
func TestDoQServer(t *testing.T) {
s, _ := createTestTLS(t, TLSConfig{
QUICListenAddrs: []*net.UDPAddr{{IP: net.IP{127, 0, 0, 1}}},
})
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
IPv4: map[string][]net.IP{
"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
},
},
}
startDeferStop(t, s)
// Create a DNS-over-QUIC upstream.
addr := s.dnsProxy.Addr(proxy.ProtoQUIC)
opts := &upstream.Options{InsecureSkipVerify: true}
u, err := upstream.AddressToUpstream(fmt.Sprintf("%s://%s", proxy.ProtoQUIC, addr), opts)
require.NoError(t, err)
// Send the test message.
req := createGoogleATestMessage()
res, err := u.Exchange(req)
require.NoError(t, err)
assertGoogleAResponse(t, res)
}
func TestServerRace(t *testing.T) {
t.Skip("TODO(e.burkov): inspect the golibs/cache package for locks")
filterConf := &filtering.Config{
SafeBrowsingEnabled: true,
SafeBrowsingCacheSize: 1000,
SafeSearchEnabled: true,
SafeSearchCacheSize: 1000,
ParentalCacheSize: 1000,
CacheTime: 30,
}
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
UpstreamDNS: []string{"8.8.8.8:53", "8.8.4.4:53"},
},
ConfigModified: func() {},
}
s := createTestServer(t, filterConf, forwardConf, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
IPv4: map[string][]net.IP{
"google-public-dns-a.google.com.": {{8, 8, 8, 8}},
},
},
}
startDeferStop(t, s)
// Message over UDP.
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
conn, err := dns.Dial("udp", addr.String())
require.NoErrorf(t, err, "cannot connect to the proxy: %s", err)
sendTestMessagesAsync(t, conn)
}
func TestSafeSearch(t *testing.T) {
resolver := &aghtest.TestResolver{}
filterConf := &filtering.Config{
SafeSearchEnabled: true,
SafeSearchCacheSize: 1000,
CacheTime: 30,
CustomResolver: resolver,
}
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
},
}
s := createTestServer(t, filterConf, forwardConf, nil)
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
client := &dns.Client{}
yandexIP := net.IP{213, 180, 193, 56}
googleIP, _ := resolver.HostToIPs("forcesafesearch.google.com")
testCases := []struct {
host string
want net.IP
}{{
host: "yandex.com.",
want: yandexIP,
}, {
host: "yandex.by.",
want: yandexIP,
}, {
host: "yandex.kz.",
want: yandexIP,
}, {
host: "yandex.ru.",
want: yandexIP,
}, {
host: "www.google.com.",
want: googleIP,
}, {
host: "www.google.com.af.",
want: googleIP,
}, {
host: "www.google.be.",
want: googleIP,
}, {
host: "www.google.by.",
want: googleIP,
}}
for _, tc := range testCases {
t.Run(tc.host, func(t *testing.T) {
req := createTestMessage(tc.host)
reply, _, err := client.Exchange(req, addr)
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
assertResponse(t, reply, tc.want)
})
}
}
func TestInvalidRequest(t *testing.T) {
s := createTestServer(t, &filtering.Config{}, ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
}, nil)
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
req := dns.Msg{
MsgHdr: dns.MsgHdr{
Id: dns.Id(),
RecursionDesired: true,
},
}
// Send a DNS request without question.
_, _, err := (&dns.Client{
Timeout: 500 * time.Millisecond,
}).Exchange(&req, addr)
assert.NoErrorf(t, err, "got a response to an invalid query")
}
func TestBlockedRequest(t *testing.T) {
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
BlockingMode: BlockingModeDefault,
},
}
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// Default blocking.
req := createTestMessage("nxdomain.example.org.")
reply, err := dns.Exchange(req, addr.String())
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
require.Len(t, reply.Answer, 1)
assert.True(t, reply.Answer[0].(*dns.A).A.IsUnspecified())
}
func TestServerCustomClientUpstream(t *testing.T) {
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
},
}
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
s.conf.GetCustomUpstreamByClient = func(_ string) (conf *proxy.UpstreamConfig, err error) {
ups := &aghtest.Upstream{
IPv4: map[string][]net.IP{
"host.": {{192, 168, 0, 1}},
},
}
return &proxy.UpstreamConfig{
Upstreams: []upstream.Upstream{ups},
}, nil
}
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// Send test request.
req := createTestMessage("host.")
reply, err := dns.Exchange(req, addr.String())
require.NoError(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
require.NotEmpty(t, reply.Answer)
require.Len(t, reply.Answer, 1)
assert.Equal(t, net.IP{192, 168, 0, 1}, reply.Answer[0].(*dns.A).A)
}
// testCNAMEs is a map of names and CNAMEs necessary for the TestUpstream work.
var testCNAMEs = map[string][]string{
"badhost.": {"NULL.example.org."},
"whitelist.example.org.": {"NULL.example.org."},
}
// testIPv4 is a map of names and IPv4s necessary for the TestUpstream work.
var testIPv4 = map[string][]net.IP{
"NULL.example.org.": {{1, 2, 3, 4}},
"example.org.": {{127, 0, 0, 255}},
}
func TestBlockCNAMEProtectionEnabled(t *testing.T) {
s := createTestServer(t, &filtering.Config{}, ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
}, nil)
testUpstm := &aghtest.Upstream{
CName: testCNAMEs,
IPv4: testIPv4,
IPv6: nil,
}
s.conf.ProtectionEnabled = false
s.dnsProxy.UpstreamConfig = &proxy.UpstreamConfig{
Upstreams: []upstream.Upstream{testUpstm},
}
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// 'badhost' has a canonical name 'NULL.example.org' which should be
// blocked by filters, but protection is disabled so it is not.
req := createTestMessage("badhost.")
reply, err := dns.Exchange(req, addr.String())
require.NoError(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
}
func TestBlockCNAME(t *testing.T) {
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
BlockingMode: BlockingModeDefault,
},
}
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
CName: testCNAMEs,
IPv4: testIPv4,
},
}
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP).String()
testCases := []struct {
name string
host string
want bool
}{{
name: "block_request",
host: "badhost.",
// 'badhost' has a canonical name 'NULL.example.org' which is
// blocked by filters: response is blocked.
want: true,
}, {
name: "allowed",
host: "whitelist.example.org.",
// 'whitelist.example.org' has a canonical name
// 'NULL.example.org' which is blocked by filters
// but 'whitelist.example.org' is in a whitelist:
// response isn't blocked.
want: false,
}, {
name: "block_response",
host: "example.org.",
// 'example.org' has a canonical name 'cname1' with IP
// 127.0.0.255 which is blocked by filters: response is blocked.
want: true,
}}
for _, tc := range testCases {
req := createTestMessage(tc.host)
t.Run(tc.name, func(t *testing.T) {
reply, err := dns.Exchange(req, addr)
require.NoError(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
if tc.want {
require.Len(t, reply.Answer, 1)
ans := reply.Answer[0]
a, ok := ans.(*dns.A)
require.True(t, ok)
assert.True(t, a.A.IsUnspecified())
}
})
}
}
func TestClientRulesForCNAMEMatching(t *testing.T) {
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
FilterHandler: func(_ net.IP, _ string, settings *filtering.Settings) {
settings.FilteringEnabled = false
},
},
}
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
CName: testCNAMEs,
IPv4: testIPv4,
},
}
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// 'badhost' has a canonical name 'NULL.example.org' which is blocked by
// filters: response is blocked.
req := dns.Msg{
MsgHdr: dns.MsgHdr{
Id: dns.Id(),
},
Question: []dns.Question{{
Name: "badhost.",
Qtype: dns.TypeA,
Qclass: dns.ClassINET,
}},
}
// However, in our case it should not be blocked as filtering is
// disabled on the client level.
reply, err := dns.Exchange(&req, addr.String())
require.NoError(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
}
func TestNullBlockedRequest(t *testing.T) {
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
BlockingMode: BlockingModeNullIP,
},
}
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// Nil filter blocking.
req := dns.Msg{
MsgHdr: dns.MsgHdr{
Id: dns.Id(),
RecursionDesired: true,
},
Question: []dns.Question{{
Name: "NULL.example.org.",
Qtype: dns.TypeA,
Qclass: dns.ClassINET,
}},
}
reply, err := dns.Exchange(&req, addr.String())
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
require.Lenf(t, reply.Answer, 1, "dns server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
a, ok := reply.Answer[0].(*dns.A)
require.Truef(t, ok, "dns server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
assert.Truef(t, a.A.IsUnspecified(), "dns server %s returned wrong answer instead of 0.0.0.0: %v", addr, a.A)
}
func TestBlockedCustomIP(t *testing.T) {
rules := "||nxdomain.example.org^\n||NULL.example.org^\n127.0.0.1 host.example.org\n@@||whitelist.example.org^\n||127.0.0.255\n"
filters := []filtering.Filter{{
ID: 0,
Data: []byte(rules),
}}
f, err := filtering.New(&filtering.Config{}, filters)
require.NoError(t, err)
s, err := NewServer(DNSCreateParams{
DHCPServer: testDHCP,
DNSFilter: f,
PrivateNets: netutil.SubnetSetFunc(netutil.IsLocallyServed),
})
require.NoError(t, err)
conf := &ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
BlockingMode: BlockingModeCustomIP,
BlockingIPv4: nil,
UpstreamDNS: []string{"8.8.8.8:53", "8.8.4.4:53"},
},
}
// Invalid BlockingIPv4.
err = s.Prepare(conf)
assert.Error(t, err)
conf.BlockingIPv4 = net.IP{0, 0, 0, 1}
conf.BlockingIPv6 = net.ParseIP("::1")
err = s.Prepare(conf)
require.NoError(t, err)
f.SetEnabled(true)
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
req := createTestMessageWithType("NULL.example.org.", dns.TypeA)
reply, err := dns.Exchange(req, addr.String())
require.NoError(t, err)
require.Len(t, reply.Answer, 1)
a, ok := reply.Answer[0].(*dns.A)
require.True(t, ok)
assert.True(t, net.IP{0, 0, 0, 1}.Equal(a.A))
req = createTestMessageWithType("NULL.example.org.", dns.TypeAAAA)
reply, err = dns.Exchange(req, addr.String())
require.NoError(t, err)
require.Len(t, reply.Answer, 1)
a6, ok := reply.Answer[0].(*dns.AAAA)
require.True(t, ok)
assert.Equal(t, "::1", a6.AAAA.String())
}
func TestBlockedByHosts(t *testing.T) {
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
BlockingMode: BlockingModeDefault,
},
}
s := createTestServer(t, &filtering.Config{}, forwardConf, nil)
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// Hosts blocking.
req := createTestMessage("host.example.org.")
reply, err := dns.Exchange(req, addr.String())
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
require.Lenf(t, reply.Answer, 1, "dns server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
a, ok := reply.Answer[0].(*dns.A)
require.Truef(t, ok, "dns server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
assert.Equalf(t, net.IP{127, 0, 0, 1}, a.A, "dns server %s returned wrong answer instead of 8.8.8.8: %v", addr, a.A)
}
func TestBlockedBySafeBrowsing(t *testing.T) {
const hostname = "wmconvirus.narod.ru"
sbUps := aghtest.NewBlockUpstream(hostname, true)
ans4, _ := (&aghtest.TestResolver{}).HostToIPs(hostname)
filterConf := &filtering.Config{
SafeBrowsingEnabled: true,
}
forwardConf := ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
SafeBrowsingBlockHost: ans4.String(),
ProtectionEnabled: true,
},
}
s := createTestServer(t, filterConf, forwardConf, nil)
s.dnsFilter.SetSafeBrowsingUpstream(sbUps)
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// SafeBrowsing blocking.
req := createTestMessage(hostname + ".")
reply, err := dns.Exchange(req, addr.String())
require.NoErrorf(t, err, "couldn't talk to server %s: %s", addr, err)
require.Lenf(t, reply.Answer, 1, "dns server %s returned reply with wrong number of answers - %d", addr, len(reply.Answer))
a, ok := reply.Answer[0].(*dns.A)
require.Truef(t, ok, "dns server %s returned wrong answer type instead of A: %v", addr, reply.Answer[0])
assert.Equal(t, ans4, a.A, "dns server %s returned wrong answer: %v", addr, a.A)
}
func TestRewrite(t *testing.T) {
c := &filtering.Config{
Rewrites: []*filtering.LegacyRewrite{{
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, err := filtering.New(c, nil)
require.NoError(t, err)
f.SetEnabled(true)
s, err := NewServer(DNSCreateParams{
DHCPServer: testDHCP,
DNSFilter: f,
PrivateNets: netutil.SubnetSetFunc(netutil.IsLocallyServed),
})
require.NoError(t, err)
assert.NoError(t, s.Prepare(&ServerConfig{
UDPListenAddrs: []*net.UDPAddr{{}},
TCPListenAddrs: []*net.TCPAddr{{}},
FilteringConfig: FilteringConfig{
ProtectionEnabled: true,
BlockingMode: BlockingModeDefault,
UpstreamDNS: []string{"8.8.8.8:53"},
},
}))
s.conf.UpstreamConfig.Upstreams = []upstream.Upstream{
&aghtest.Upstream{
CName: map[string][]string{
"example.org": {"somename"},
},
IPv4: map[string][]net.IP{
"example.org.": {{4, 3, 2, 1}},
},
},
}
startDeferStop(t, s)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
subTestFunc := func(t *testing.T) {
req := createTestMessageWithType("test.com.", dns.TypeA)
reply, eerr := dns.Exchange(req, addr.String())
require.NoError(t, eerr)
require.Len(t, reply.Answer, 1)
a, ok := reply.Answer[0].(*dns.A)
require.True(t, ok)
assert.True(t, net.IP{1, 2, 3, 4}.Equal(a.A))
req = createTestMessageWithType("test.com.", dns.TypeAAAA)
reply, eerr = dns.Exchange(req, addr.String())
require.NoError(t, eerr)
assert.Empty(t, reply.Answer)
req = createTestMessageWithType("alias.test.com.", dns.TypeA)
reply, eerr = dns.Exchange(req, addr.String())
require.NoError(t, eerr)
require.Len(t, reply.Answer, 2)
assert.Equal(t, "test.com.", reply.Answer[0].(*dns.CNAME).Target)
assert.True(t, net.IP{1, 2, 3, 4}.Equal(reply.Answer[1].(*dns.A).A))
req = createTestMessageWithType("my.alias.example.org.", dns.TypeA)
reply, eerr = dns.Exchange(req, addr.String())
require.NoError(t, eerr)
// The original question is restored.
require.Len(t, reply.Question, 1)
assert.Equal(t, "my.alias.example.org.", reply.Question[0].Name)
require.Len(t, reply.Answer, 2)
assert.Equal(t, "example.org.", reply.Answer[0].(*dns.CNAME).Target)
assert.Equal(t, dns.TypeA, reply.Answer[1].Header().Rrtype)
}
for _, protect := range []bool{true, false} {
val := protect
conf := s.getDNSConfig()
conf.ProtectionEnabled = &val
s.setConfig(conf)
t.Run(fmt.Sprintf("protection_is_%t", val), subTestFunc)
}
}
func publicKey(priv any) any {