AdguardTeam/AdGuardHome
1
1
Fork 0
mirror of https://github.com/AdguardTeam/AdGuardHome.git synced 2024-12-15 19:31:45 +03:00
Code Issues Packages Projects Releases Wiki Activity
b54ce85d3d
AdGuardHome/dnsforward/dnsforward_test.go

1063 lines
29 KiB
Go
Raw Blame History

package dnsforward
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"sort"
"sync"
"testing"
"time"
"github.com/AdguardTeam/AdGuardHome/dhcpd"
"github.com/AdguardTeam/AdGuardHome/dnsfilter"
"github.com/AdguardTeam/dnsproxy/proxy"
"github.com/AdguardTeam/dnsproxy/upstream"
"github.com/miekg/dns"
"github.com/stretchr/testify/assert"
)
const (
tlsServerName = "testdns.adguard.com"
testMessagesCount = 10
)
func TestServer(t *testing.T) {
s := createTestServer(t)
err := s.Start()
if err != nil {
t.Fatalf("Failed to start server: %s", err)
}
// message over UDP
req := createGoogleATestMessage()
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
client := dns.Client{Net: "udp"}
reply, _, err := client.Exchange(req, addr.String())
if err != nil {
t.Fatalf("Couldn't talk to server %s: %s", addr, err)
}
assertGoogleAResponse(t, reply)
// message over TCP
req = createGoogleATestMessage()
addr = s.dnsProxy.Addr("tcp")
client = dns.Client{Net: "tcp"}
reply, _, err = client.Exchange(req, addr.String())
if err != nil {
t.Fatalf("Couldn't talk to server %s: %s", addr, err)
}
assertGoogleAResponse(t, reply)
err = s.Stop()
if err != nil {
t.Fatalf("DNS server failed to stop: %s", err)
}
}
func TestServerWithProtectionDisabled(t *testing.T) {
s := createTestServer(t)
s.conf.ProtectionEnabled = false
err := s.Start()
if err != nil {
t.Fatalf("Failed to start server: %s", err)
}
// message over UDP
req := createGoogleATestMessage()
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
client := dns.Client{Net: "udp"}
reply, _, err := client.Exchange(req, addr.String())
if err != nil {
t.Fatalf("Couldn't talk to server %s: %s", addr, err)
}
assertGoogleAResponse(t, reply)
err = s.Stop()
if err != nil {
t.Fatalf("DNS server failed to stop: %s", err)
}
}
func TestDotServer(t *testing.T) {
// Prepare the proxy server
_, certPem, keyPem := createServerTLSConfig(t)
s := createTestServer(t)
s.conf.TLSConfig = TLSConfig{
TLSListenAddr: &net.TCPAddr{Port: 0},
CertificateChainData: certPem,
PrivateKeyData: keyPem,
}
_ = s.Prepare(nil)
// Starting the server
err := s.Start()
if err != nil {
t.Fatalf("Failed to start server: %s", err)
}
// 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)
if err != nil {
t.Fatalf("cannot connect to the proxy: %s", err)
}
sendTestMessages(t, conn)
// Stop the proxy
err = s.Stop()
if err != nil {
t.Fatalf("DNS server failed to stop: %s", err)
}
}
func TestServerRace(t *testing.T) {
s := createTestServer(t)
err := s.Start()
if err != nil {
t.Fatalf("Failed to start server: %s", err)
}
// message over UDP
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
conn, err := dns.Dial("udp", addr.String())
if err != nil {
t.Fatalf("cannot connect to the proxy: %s", err)
}
sendTestMessagesAsync(t, conn)
// Stop the proxy
err = s.Stop()
if err != nil {
t.Fatalf("DNS server failed to stop: %s", err)
}
}
func TestSafeSearch(t *testing.T) {
s := createTestServer(t)
err := s.Start()
if err != nil {
t.Fatalf("Failed to start server: %s", err)
}
// Test safe search for yandex. We already know safe search ip
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
client := dns.Client{Net: "udp"}
yandexDomains := []string{"yandex.com.", "yandex.by.", "yandex.kz.", "yandex.ru.", "yandex.com."}
for _, host := range yandexDomains {
exchangeAndAssertResponse(t, &client, addr, host, "213.180.193.56")
}
// Let's lookup for google safesearch ip
ips, err := net.LookupIP("forcesafesearch.google.com")
if err != nil {
t.Fatalf("Failed to lookup for forcesafesearch.google.com: %s", err)
}
ip := ips[0]
for _, i := range ips {
if i.To4() != nil {
ip = i
break
}
}
// Test safe search for google.
googleDomains := []string{"www.google.com.", "www.google.com.af.", "www.google.be.", "www.google.by."}
for _, host := range googleDomains {
exchangeAndAssertResponse(t, &client, addr, host, ip.String())
}
err = s.Stop()
if err != nil {
t.Fatalf("Can not stopd server cause: %s", err)
}
}
func TestInvalidRequest(t *testing.T) {
s := createTestServer(t)
err := s.Start()
if err != nil {
t.Fatalf("Failed to start server: %s", err)
}
// server is running, send a message
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
req := dns.Msg{}
req.Id = dns.Id()
req.RecursionDesired = true
// send a DNS request without question
client := dns.Client{Net: "udp", Timeout: 500 * time.Millisecond}
_, _, err = client.Exchange(&req, addr.String())
if err != nil {
t.Fatalf("got a response to an invalid query")
}
err = s.Stop()
if err != nil {
t.Fatalf("DNS server failed to stop: %s", err)
}
}
func TestBlockedRequest(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)
//
// NXDomain blocking
//
req := dns.Msg{}
req.Id = dns.Id()
req.RecursionDesired = true
req.Question = []dns.Question{
{Name: "nxdomain.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 reply.Rcode != dns.RcodeNameError {
t.Fatalf("Wrong response: %s", reply.String())
}
err = s.Stop()
if err != nil {
t.Fatalf("DNS server failed to stop: %s", err)
}
}
func TestServerCustomClientUpstream(t *testing.T) {
s := createTestServer(t)
s.conf.GetCustomUpstreamByClient = func(clientAddr string) *proxy.UpstreamConfig {
uc := &proxy.UpstreamConfig{}
u := &testUpstream{}
u.ipv4 = map[string][]net.IP{}
u.ipv4["host."] = []net.IP{net.ParseIP("192.168.0.1")}
uc.Upstreams = append(uc.Upstreams, u)
return uc
}
assert.Nil(t, s.Start())
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// Send test request
req := dns.Msg{}
req.Id = dns.Id()
req.RecursionDesired = true
req.Question = []dns.Question{
{Name: "host.", Qtype: dns.TypeA, Qclass: dns.ClassINET},
}
reply, err := dns.Exchange(&req, addr.String())
assert.Nil(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
assert.NotNil(t, reply.Answer)
assert.Equal(t, "192.168.0.1", reply.Answer[0].(*dns.A).A.String())
assert.Nil(t, s.Stop())
}
// testUpstream is a mock of real upstream.
// specify fields with necessary values to simulate real upstream behaviour
type testUpstream struct {
cn map[string]string // Map of [name]canonical_name
ipv4 map[string][]net.IP // Map of [name]IPv4
ipv6 map[string][]net.IP // Map of [name]IPv6
}
func (u *testUpstream) Exchange(m *dns.Msg) (*dns.Msg, error) {
resp := dns.Msg{}
resp.SetReply(m)
hasARecord := false
hasAAAARecord := false
reqType := m.Question[0].Qtype
name := m.Question[0].Name
// Let's check if we have any CNAME for given name
if cname, ok := u.cn[name]; ok {
cn := dns.CNAME{}
cn.Hdr.Name = name
cn.Hdr.Rrtype = dns.TypeCNAME
cn.Target = cname
resp.Answer = append(resp.Answer, &cn)
}
// Let's check if we can add some A records to the answer
if ipv4addr, ok := u.ipv4[name]; ok && reqType == dns.TypeA {
hasARecord = true
for _, ipv4 := range ipv4addr {
respA := dns.A{}
respA.Hdr.Rrtype = dns.TypeA
respA.Hdr.Name = name
respA.A = ipv4
resp.Answer = append(resp.Answer, &respA)
}
}
// Let's check if we can add some AAAA records to the answer
if u.ipv6 != nil {
if ipv6addr, ok := u.ipv6[name]; ok && reqType == dns.TypeAAAA {
hasAAAARecord = true
for _, ipv6 := range ipv6addr {
respAAAA := dns.A{}
respAAAA.Hdr.Rrtype = dns.TypeAAAA
respAAAA.Hdr.Name = name
respAAAA.A = ipv6
resp.Answer = append(resp.Answer, &respAAAA)
}
}
}
if len(resp.Answer) == 0 {
if hasARecord || hasAAAARecord {
// Set No Error RCode if there are some records for given Qname but we didn't apply them
resp.SetRcode(m, dns.RcodeSuccess)
} else {
// Set NXDomain RCode otherwise
resp.SetRcode(m, dns.RcodeNameError)
}
}
return &resp, nil
}
func (u *testUpstream) Address() string {
return "test"
}
func (s *Server) startWithUpstream(u upstream.Upstream) error {
s.Lock()
defer s.Unlock()
err := s.Prepare(nil)
if err != nil {
return err
}
s.dnsProxy.UpstreamConfig = &proxy.UpstreamConfig{
Upstreams: []upstream.Upstream{u},
}
return s.dnsProxy.Start()
}
// testCNAMEs is a simple 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 simple 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)
testUpstm := &testUpstream{testCNAMEs, testIPv4, nil}
s.conf.ProtectionEnabled = false
err := s.startWithUpstream(testUpstm)
assert.True(t, err == nil)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// 'badhost' has a canonical name 'null.example.org' which is blocked by filters:
// but protection is disabled - response is NOT blocked
req := createTestMessage("badhost.")
reply, err := dns.Exchange(req, addr.String())
assert.Nil(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
}
func TestBlockCNAME(t *testing.T) {
s := createTestServer(t)
testUpstm := &testUpstream{testCNAMEs, testIPv4, nil}
err := s.startWithUpstream(testUpstm)
assert.True(t, err == nil)
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
// 'badhost' has a canonical name 'null.example.org' which is blocked by filters:
// response is blocked
req := createTestMessage("badhost.")
reply, err := dns.Exchange(req, addr.String())
assert.Nil(t, err, nil)
assert.Equal(t, dns.RcodeNameError, reply.Rcode)
// '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
req = createTestMessage("whitelist.example.org.")
reply, err = dns.Exchange(req, addr.String())
assert.Nil(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
// 'example.org' has a canonical name 'cname1' with IP 127.0.0.255 which is blocked by filters:
// response is blocked
req = createTestMessage("example.org.")
reply, err = dns.Exchange(req, addr.String())
assert.Nil(t, err)
assert.Equal(t, dns.RcodeNameError, reply.Rcode)
_ = s.Stop()
}
func TestClientRulesForCNAMEMatching(t *testing.T) {
s := createTestServer(t)
testUpstm := &testUpstream{testCNAMEs, testIPv4, nil}
s.conf.FilterHandler = func(clientAddr string, settings *dnsfilter.RequestFilteringSettings) {
settings.FilteringEnabled = false
}
err := s.startWithUpstream(testUpstm)
assert.Nil(t, err)
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{}
req.Id = dns.Id()
req.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())
assert.Nil(t, err)
assert.Equal(t, dns.RcodeSuccess, reply.Rcode)
}
func TestNullBlockedRequest(t *testing.T) {
s := createTestServer(t)
s.conf.FilteringConfig.BlockingMode = "null_ip"
err := s.Start()
if err != nil {
t.Fatalf("Failed to start server: %s", err)
}
addr := s.dnsProxy.Addr(proxy.ProtoUDP)
//
// Null filter blocking
//
req := dns.Msg{}
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{
dnsfilter.RewriteEntry{
Domain: "test.com",
Answer: "1.2.3.4",
Type: dns.TypeA,
},
dnsfilter.RewriteEntry{
Domain: "alias.test.com",
Answer: "test.com",
Type: dns.TypeCNAME,
},
dnsfilter.RewriteEntry{
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 TestIsBlockedIPAllowed(t *testing.T) {
a := &accessCtx{}
assert.True(t, a.Init([]string{"1.1.1.1", "2.2.0.0/16"}, nil, nil) == nil)
assert.True(t, !a.IsBlockedIP("1.1.1.1"))
assert.True(t, a.IsBlockedIP("1.1.1.2"))
assert.True(t, !a.IsBlockedIP("2.2.1.1"))
assert.True(t, a.IsBlockedIP("2.3.1.1"))
}
func TestIsBlockedIPDisallowed(t *testing.T) {
a := &accessCtx{}
assert.True(t, a.Init(nil, []string{"1.1.1.1", "2.2.0.0/16"}, nil) == nil)
assert.True(t, a.IsBlockedIP("1.1.1.1"))
assert.True(t, !a.IsBlockedIP("1.1.1.2"))
assert.True(t, a.IsBlockedIP("2.2.1.1"))
assert.True(t, !a.IsBlockedIP("2.3.1.1"))
}
func TestIsBlockedIPBlockedDomain(t *testing.T) {
a := &accessCtx{}
assert.True(t, a.Init(nil, nil, []string{"host1",
"host2",
"*.host.com",
"||host3.com^",
}) == nil)
// match by "host2.com"
assert.True(t, a.IsBlockedDomain("host1"))
assert.True(t, a.IsBlockedDomain("host2"))
assert.True(t, !a.IsBlockedDomain("host3"))
// match by wildcard "*.host.com"
assert.True(t, !a.IsBlockedDomain("host.com"))
assert.True(t, a.IsBlockedDomain("asdf.host.com"))
assert.True(t, a.IsBlockedDomain("qwer.asdf.host.com"))
assert.True(t, !a.IsBlockedDomain("asdf.zhost.com"))
// match by wildcard "||host3.com^"
assert.True(t, a.IsBlockedDomain("host3.com"))
assert.True(t, a.IsBlockedDomain("asdf.host3.com"))
}
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) {
// 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)
if err == nil {
t.Fatalf("there is no default upstream")
}
// Let's add default upstream
upstreamsSet = append(upstreamsSet, "8.8.8.8")
err = ValidateUpstreams(upstreamsSet)
if err != nil {
t.Fatalf("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)
if err == nil {
t.Fatalf("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 TestPTRResponse(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()
}
Reference in New Issue View Git Blame Copy Permalink