crypto/tls: Improve TLS Client Authentication

Fix incorrect marshal/unmarshal of certificateRequest.
Add support for configuring client-auth on the server side.
Fix the certificate selection in the client side.
Update generate_cert.go to new time package

Fixes #2521.

R=krautz, agl, bradfitz
CC=golang-dev, mikkel
https://golang.org/cl/5448093

common.go

@@ -111,6 +111,18 @@ type ConnectionState struct {
 	VerifiedChains [][]*x509.Certificate
 }
 
+// ClientAuthType declares the policy the server will follow for
+// TLS Client Authentication.
+type ClientAuthType int
+
+const (
+	NoClientCert ClientAuthType = iota
+	RequestClientCert
+	RequireAnyClientCert
+	VerifyClientCertIfGiven
+	RequireAndVerifyClientCert
+)
+
 // A Config structure is used to configure a TLS client or server. After one
 // has been passed to a TLS function it must not be modified.
 type Config struct {
@@ -120,7 +132,7 @@ type Config struct {
 	Rand io.Reader
 
 	// Time returns the current time as the number of seconds since the epoch.
-	// If Time is nil, TLS uses the system time.Seconds.
+	// If Time is nil, TLS uses time.Now.
 	Time func() time.Time
 
 	// Certificates contains one or more certificate chains
@@ -148,11 +160,14 @@ type Config struct {
 	// hosting.
 	ServerName string
 
-	// AuthenticateClient controls whether a server will request a certificate
-	// from the client. It does not require that the client send a
-	// certificate nor does it require that the certificate sent be
-	// anything more than self-signed.
-	AuthenticateClient bool
+	// ClientAuth determines the server's policy for
+	// TLS Client Authentication. The default is NoClientCert.
+	ClientAuth ClientAuthType
+
+	// ClientCAs defines the set of root certificate authorities
+	// that servers use if required to verify a client certificate
+	// by the policy in ClientAuth.
+	ClientCAs *x509.CertPool
 
 	// InsecureSkipVerify controls whether a client verifies the
 	// server's certificate chain and host name.
@@ -259,6 +274,11 @@ type Certificate struct {
 	// OCSPStaple contains an optional OCSP response which will be served
 	// to clients that request it.
 	OCSPStaple []byte
+	// Leaf is the parsed form of the leaf certificate, which may be
+	// initialized using x509.ParseCertificate to reduce per-handshake
+	// processing for TLS clients doing client authentication. If nil, the
+	// leaf certificate will be parsed as needed.
+	Leaf *x509.Certificate
 }
 
 // A TLS record.

handshake_client.go

@@ -5,12 +5,14 @@
 package tls
 
 import (
+	"bytes"
 	"crypto"
 	"crypto/rsa"
 	"crypto/subtle"
 	"crypto/x509"
 	"errors"
 	"io"
+	"strconv"
 )
 
 func (c *Conn) clientHandshake() error {
@@ -162,10 +164,23 @@ func (c *Conn) clientHandshake() error {
 		}
 	}
 
-	transmitCert := false
+	var certToSend *Certificate
 	certReq, ok := msg.(*certificateRequestMsg)
 	if ok {
-		// We only accept certificates with RSA keys.
+		// RFC 4346 on the certificateAuthorities field:
+		// A list of the distinguished names of acceptable certificate
+		// authorities. These distinguished names may specify a desired
+		// distinguished name for a root CA or for a subordinate CA;
+		// thus, this message can be used to describe both known roots
+		// and a desired authorization space. If the
+		// certificate_authorities list is empty then the client MAY
+		// send any certificate of the appropriate
+		// ClientCertificateType, unless there is some external
+		// arrangement to the contrary.
+
+		finishedHash.Write(certReq.marshal())
+
+		// For now, we only know how to sign challenges with RSA
 		rsaAvail := false
 		for _, certType := range certReq.certificateTypes {
 			if certType == certTypeRSASign {
@@ -174,23 +189,41 @@ func (c *Conn) clientHandshake() error {
 			}
 		}
 
-		// For now, only send a certificate back if the server gives us an
-		// empty list of certificateAuthorities.
-		//
-		// RFC 4346 on the certificateAuthorities field:
-		// A list of the distinguished names of acceptable certificate
-		// authorities.  These distinguished names may specify a desired
-		// distinguished name for a root CA or for a subordinate CA; thus,
-		// this message can be used to describe both known roots and a
-		// desired authorization space.  If the certificate_authorities
-		// list is empty then the client MAY send any certificate of the
-		// appropriate ClientCertificateType, unless there is some
-		// external arrangement to the contrary.
-		if rsaAvail && len(certReq.certificateAuthorities) == 0 {
-			transmitCert = true
-		}
+		// We need to search our list of client certs for one
+		// where SignatureAlgorithm is RSA and the Issuer is in
+		// certReq.certificateAuthorities
+	findCert:
+		for i, cert := range c.config.Certificates {
+			if !rsaAvail {
+				continue
+			}
 
-		finishedHash.Write(certReq.marshal())
+			leaf := cert.Leaf
+			if leaf == nil {
+				if leaf, err = x509.ParseCertificate(cert.Certificate[0]); err != nil {
+					c.sendAlert(alertInternalError)
+					return errors.New("tls: failed to parse client certificate #" + strconv.Itoa(i) + ": " + err.Error())
+				}
+			}
+
+			if leaf.PublicKeyAlgorithm != x509.RSA {
+				continue
+			}
+
+			if len(certReq.certificateAuthorities) == 0 {
+				// they gave us an empty list, so just take the
+				// first RSA cert from c.config.Certificates
+				certToSend = &cert
+				break
+			}
+
+			for _, ca := range certReq.certificateAuthorities {
+				if bytes.Equal(leaf.RawIssuer, ca) {
+					certToSend = &cert
+					break findCert
+				}
+			}
+		}
 
 		msg, err = c.readHandshake()
 		if err != nil {
@@ -204,17 +237,9 @@ func (c *Conn) clientHandshake() error {
 	}
 	finishedHash.Write(shd.marshal())
 
-	var cert *x509.Certificate
-	if transmitCert {
+	if certToSend != nil {
 		certMsg = new(certificateMsg)
-		if len(c.config.Certificates) > 0 {
-			cert, err = x509.ParseCertificate(c.config.Certificates[0].Certificate[0])
-			if err == nil && cert.PublicKeyAlgorithm == x509.RSA {
-				certMsg.certificates = c.config.Certificates[0].Certificate
-			} else {
-				cert = nil
-			}
-		}
+		certMsg.certificates = certToSend.Certificate
 		finishedHash.Write(certMsg.marshal())
 		c.writeRecord(recordTypeHandshake, certMsg.marshal())
 	}
@@ -229,7 +254,7 @@ func (c *Conn) clientHandshake() error {
 		c.writeRecord(recordTypeHandshake, ckx.marshal())
 	}
 
-	if cert != nil {
+	if certToSend != nil {
 		certVerify := new(certificateVerifyMsg)
 		digest := make([]byte, 0, 36)
 		digest = finishedHash.serverMD5.Sum(digest)

handshake_messages.go

@@ -881,9 +881,11 @@ func (m *certificateRequestMsg) marshal() (x []byte) {
 
 	// See http://tools.ietf.org/html/rfc4346#section-7.4.4
 	length := 1 + len(m.certificateTypes) + 2
+	casLength := 0
 	for _, ca := range m.certificateAuthorities {
-		length += 2 + len(ca)
+		casLength += 2 + len(ca)
 	}
+	length += casLength
 
 	x = make([]byte, 4+length)
 	x[0] = typeCertificateRequest
@@ -895,10 +897,8 @@ func (m *certificateRequestMsg) marshal() (x []byte) {
 
 	copy(x[5:], m.certificateTypes)
 	y := x[5+len(m.certificateTypes):]
-
-	numCA := len(m.certificateAuthorities)
-	y[0] = uint8(numCA >> 8)
-	y[1] = uint8(numCA)
+	y[0] = uint8(casLength >> 8)
+	y[1] = uint8(casLength)
 	y = y[2:]
 	for _, ca := range m.certificateAuthorities {
 		y[0] = uint8(len(ca) >> 8)
@@ -909,7 +909,6 @@ func (m *certificateRequestMsg) marshal() (x []byte) {
 	}
 
 	m.raw = x
-
 	return
 }
 
@@ -937,31 +936,34 @@ func (m *certificateRequestMsg) unmarshal(data []byte) bool {
 	}
 
 	data = data[numCertTypes:]
+
 	if len(data) < 2 {
 		return false
 	}
-
-	numCAs := uint16(data[0])<<16 | uint16(data[1])
+	casLength := uint16(data[0])<<8 | uint16(data[1])
 	data = data[2:]
+	if len(data) < int(casLength) {
+		return false
+	}
+	cas := make([]byte, casLength)
+	copy(cas, data)
+	data = data[casLength:]
 
-	m.certificateAuthorities = make([][]byte, numCAs)
-	for i := uint16(0); i < numCAs; i++ {
-		if len(data) < 2 {
+	m.certificateAuthorities = nil
+	for len(cas) > 0 {
+		if len(cas) < 2 {
 			return false
 		}
-		caLen := uint16(data[0])<<16 | uint16(data[1])
+		caLen := uint16(cas[0])<<8 | uint16(cas[1])
+		cas = cas[2:]
 
-		data = data[2:]
-		if len(data) < int(caLen) {
+		if len(cas) < int(caLen) {
 			return false
 		}
 
-		ca := make([]byte, caLen)
-		copy(ca, data)
-		m.certificateAuthorities[i] = ca
-		data = data[caLen:]
+		m.certificateAuthorities = append(m.certificateAuthorities, cas[:caLen])
+		cas = cas[caLen:]
 	}
-
 	if len(data) > 0 {
 		return false
 	}

handshake_server.go

@@ -150,14 +150,19 @@ FindCipherSuite:
 		c.writeRecord(recordTypeHandshake, skx.marshal())
 	}
 
-	if config.AuthenticateClient {
+	if config.ClientAuth >= RequestClientCert {
 		// Request a client certificate
 		certReq := new(certificateRequestMsg)
 		certReq.certificateTypes = []byte{certTypeRSASign}
+
 		// An empty list of certificateAuthorities signals to
 		// the client that it may send any certificate in response
-		// to our request.
-
+		// to our request. When we know the CAs we trust, then
+		// we can send them down, so that the client can choose
+		// an appropriate certificate to give to us.
+		if config.ClientCAs != nil {
+			certReq.certificateAuthorities = config.ClientCAs.Subjects()
+		}
 		finishedHash.Write(certReq.marshal())
 		c.writeRecord(recordTypeHandshake, certReq.marshal())
 	}
@@ -166,52 +171,87 @@ FindCipherSuite:
 	finishedHash.Write(helloDone.marshal())
 	c.writeRecord(recordTypeHandshake, helloDone.marshal())
 
-	var pub *rsa.PublicKey
-	if config.AuthenticateClient {
-		// Get client certificate
-		msg, err = c.readHandshake()
-		if err != nil {
-			return err
-		}
-		certMsg, ok = msg.(*certificateMsg)
-		if !ok {
-			return c.sendAlert(alertUnexpectedMessage)
+	var pub *rsa.PublicKey // public key for client auth, if any
+
+	msg, err = c.readHandshake()
+	if err != nil {
+		return err
+	}
+
+	// If we requested a client certificate, then the client must send a
+	// certificate message, even if it's empty.
+	if config.ClientAuth >= RequestClientCert {
+		if certMsg, ok = msg.(*certificateMsg); !ok {
+			return c.sendAlert(alertHandshakeFailure)
 		}
 		finishedHash.Write(certMsg.marshal())
 
+		if len(certMsg.certificates) == 0 {
+			// The client didn't actually send a certificate
+			switch config.ClientAuth {
+			case RequireAnyClientCert, RequireAndVerifyClientCert:
+				c.sendAlert(alertBadCertificate)
+				return errors.New("tls: client didn't provide a certificate")
+			}
+		}
+
 		certs := make([]*x509.Certificate, len(certMsg.certificates))
 		for i, asn1Data := range certMsg.certificates {
-			cert, err := x509.ParseCertificate(asn1Data)
-			if err != nil {
+			if certs[i], err = x509.ParseCertificate(asn1Data); err != nil {
 				c.sendAlert(alertBadCertificate)
-				return errors.New("could not parse client's certificate: " + err.Error())
+				return errors.New("tls: failed to parse client certificate: " + err.Error())
 			}
-			certs[i] = cert
 		}
 
-		// TODO(agl): do better validation of certs: max path length, name restrictions etc.
-		for i := 1; i < len(certs); i++ {
-			if err := certs[i-1].CheckSignatureFrom(certs[i]); err != nil {
+		if c.config.ClientAuth >= VerifyClientCertIfGiven && len(certs) > 0 {
+			opts := x509.VerifyOptions{
+				Roots:         c.config.ClientCAs,
+				CurrentTime:   c.config.time(),
+				Intermediates: x509.NewCertPool(),
+			}
+
+			for i, cert := range certs {
+				if i == 0 {
+					continue
+				}
+				opts.Intermediates.AddCert(cert)
+			}
+
+			chains, err := certs[0].Verify(opts)
+			if err != nil {
 				c.sendAlert(alertBadCertificate)
-				return errors.New("could not validate certificate signature: " + err.Error())
+				return errors.New("tls: failed to verify client's certificate: " + err.Error())
 			}
+
+			ok := false
+			for _, ku := range certs[0].ExtKeyUsage {
+				if ku == x509.ExtKeyUsageClientAuth {
+					ok = true
+					break
+				}
+			}
+			if !ok {
+				c.sendAlert(alertHandshakeFailure)
+				return errors.New("tls: client's certificate's extended key usage doesn't permit it to be used for client authentication")
+			}
+
+			c.verifiedChains = chains
 		}
 
 		if len(certs) > 0 {
-			key, ok := certs[0].PublicKey.(*rsa.PublicKey)
-			if !ok {
+			if pub, ok = certs[0].PublicKey.(*rsa.PublicKey); !ok {
 				return c.sendAlert(alertUnsupportedCertificate)
 			}
-			pub = key
 			c.peerCertificates = certs
 		}
+
+		msg, err = c.readHandshake()
+		if err != nil {
+			return err
+		}
 	}
 
 	// Get client key exchange
-	msg, err = c.readHandshake()
-	if err != nil {
-		return err
-	}
 	ckx, ok := msg.(*clientKeyExchangeMsg)
 	if !ok {
 		return c.sendAlert(alertUnexpectedMessage)

handshake_server_test.go

@@ -7,9 +7,12 @@ package tls
 import (
 	"bytes"
 	"crypto/rsa"
+	"crypto/x509"
 	"encoding/hex"
+	"encoding/pem"
 	"flag"
 	"io"
+	"log"
 	"math/big"
 	"net"
 	"strconv"
@@ -109,16 +112,18 @@ func TestClose(t *testing.T) {
 	}
 }
 
-func testServerScript(t *testing.T, name string, serverScript [][]byte, config *Config) {
+func testServerScript(t *testing.T, name string, serverScript [][]byte, config *Config, peers []*x509.Certificate) {
 	c, s := net.Pipe()
 	srv := Server(s, config)
+	pchan := make(chan []*x509.Certificate, 1)
 	go func() {
 		srv.Write([]byte("hello, world\n"))
 		srv.Close()
 		s.Close()
+		st := srv.ConnectionState()
+		pchan <- st.PeerCertificates
 	}()
 
-	defer c.Close()
 	for i, b := range serverScript {
 		if i%2 == 0 {
 			c.Write(b)
@@ -133,34 +138,66 @@ func testServerScript(t *testing.T, name string, serverScript [][]byte, config *
 			t.Fatalf("%s #%d: mismatch on read: got:%x want:%x", name, i, bb, b)
 		}
 	}
+	c.Close()
+
+	if peers != nil {
+		gotpeers := <-pchan
+		if len(peers) == len(gotpeers) {
+			for i, _ := range peers {
+				if !peers[i].Equal(gotpeers[i]) {
+					t.Fatalf("%s: mismatch on peer cert %d", name, i)
+				}
+			}
+		} else {
+			t.Fatalf("%s: mismatch on peer list length: %d (wanted) != %d (got)", name, len(peers), len(gotpeers))
+		}
+	}
 }
 
 func TestHandshakeServerRC4(t *testing.T) {
-	testServerScript(t, "RC4", rc4ServerScript, testConfig)
+	testServerScript(t, "RC4", rc4ServerScript, testConfig, nil)
 }
 
 func TestHandshakeServer3DES(t *testing.T) {
 	des3Config := new(Config)
 	*des3Config = *testConfig
 	des3Config.CipherSuites = []uint16{TLS_RSA_WITH_3DES_EDE_CBC_SHA}
-	testServerScript(t, "3DES", des3ServerScript, des3Config)
+	testServerScript(t, "3DES", des3ServerScript, des3Config, nil)
 }
 
 func TestHandshakeServerAES(t *testing.T) {
 	aesConfig := new(Config)
 	*aesConfig = *testConfig
 	aesConfig.CipherSuites = []uint16{TLS_RSA_WITH_AES_128_CBC_SHA}
-	testServerScript(t, "AES", aesServerScript, aesConfig)
+	testServerScript(t, "AES", aesServerScript, aesConfig, nil)
 }
 
 func TestHandshakeServerSSLv3(t *testing.T) {
-	testServerScript(t, "SSLv3", sslv3ServerScript, testConfig)
+	testServerScript(t, "SSLv3", sslv3ServerScript, testConfig, nil)
+}
+
+type clientauthTest struct {
+	name       string
+	clientauth ClientAuthType
+	peers      []*x509.Certificate
+	script     [][]byte
+}
+
+func TestClientAuth(t *testing.T) {
+	for _, cat := range clientauthTests {
+		t.Log("running", cat.name)
+		cfg := new(Config)
+		*cfg = *testConfig
+		cfg.ClientAuth = cat.clientauth
+		testServerScript(t, cat.name, cat.script, cfg, cat.peers)
+	}
 }
 
 var serve = flag.Bool("serve", false, "run a TLS server on :10443")
 var testCipherSuites = flag.String("ciphersuites",
 	"0x"+strconv.FormatInt(int64(TLS_RSA_WITH_RC4_128_SHA), 16),
 	"cipher suites to accept in serving mode")
+var testClientAuth = flag.Int("clientauth", 0, "value for tls.Config.ClientAuth")
 
 func TestRunServer(t *testing.T) {
 	if !*serve {
@@ -177,6 +214,8 @@ func TestRunServer(t *testing.T) {
 		testConfig.CipherSuites[i] = uint16(suite)
 	}
 
+	testConfig.ClientAuth = ClientAuthType(*testClientAuth)
+
 	l, err := Listen("tcp", ":10443", testConfig)
 	if err != nil {
 		t.Fatal(err)
@@ -185,13 +224,23 @@ func TestRunServer(t *testing.T) {
 	for {
 		c, err := l.Accept()
 		if err != nil {
+			log.Printf("error from TLS handshake: %s", err)
 			break
 		}
+
 		_, err = c.Write([]byte("hello, world\n"))
 		if err != nil {
-			t.Errorf("error from TLS: %s", err)
-			break
+			log.Printf("error from TLS: %s", err)
+			continue
 		}
+
+		st := c.(*Conn).ConnectionState()
+		if len(st.PeerCertificates) > 0 {
+			log.Print("Handling request from client ", st.PeerCertificates[0].Subject.CommonName)
+		} else {
+			log.Print("Handling request from anon client")
+		}
+
 		c.Close()
 	}
 }
@@ -221,6 +270,18 @@ var testPrivateKey = &rsa.PrivateKey{
 	},
 }
 
+func loadPEMCert(in string) *x509.Certificate {
+	block, _ := pem.Decode([]byte(in))
+	if block.Type == "CERTIFICATE" && len(block.Headers) == 0 {
+		cert, err := x509.ParseCertificate(block.Bytes)
+		if err == nil {
+			return cert
+		}
+		panic("error parsing cert")
+	}
+	panic("error parsing PEM")
+}
+
 // Script of interaction with gnutls implementation.
 // The values for this test are obtained by building and running in server mode:
 //   % gotest -test.run "TestRunServer" -serve
@@ -229,23 +290,22 @@ var testPrivateKey = &rsa.PrivateKey{
 //   % python parse-gnutls-cli-debug-log.py < /tmp/log
 var rc4ServerScript = [][]byte{
 	{
-		0x16, 0x03, 0x02, 0x00, 0x7f, 0x01, 0x00, 0x00,
-		0x7b, 0x03, 0x02, 0x4d, 0x08, 0x1f, 0x5a, 0x7a,
-		0x0a, 0x92, 0x2f, 0xf0, 0x73, 0x16, 0x3a, 0x88,
-		0x14, 0x85, 0x4c, 0x98, 0x15, 0x7b, 0x65, 0xe0,
-		0x78, 0xd0, 0xed, 0xd0, 0xf3, 0x65, 0x20, 0xeb,
-		0x80, 0xd1, 0x0b, 0x00, 0x00, 0x34, 0x00, 0x33,
+		0x16, 0x03, 0x02, 0x00, 0x7a, 0x01, 0x00, 0x00,
+		0x76, 0x03, 0x02, 0x4e, 0xdd, 0xe6, 0xa5, 0xf7,
+		0x00, 0x36, 0xf7, 0x83, 0xec, 0x93, 0x7c, 0xd2,
+		0x4d, 0xe7, 0x7b, 0xf5, 0x4c, 0xf7, 0xe3, 0x86,
+		0xe8, 0xec, 0x3b, 0xbd, 0x2c, 0x9a, 0x3f, 0x57,
+		0xf0, 0xa4, 0xd4, 0x00, 0x00, 0x34, 0x00, 0x33,
 		0x00, 0x45, 0x00, 0x39, 0x00, 0x88, 0x00, 0x16,
 		0x00, 0x32, 0x00, 0x44, 0x00, 0x38, 0x00, 0x87,
 		0x00, 0x13, 0x00, 0x66, 0x00, 0x90, 0x00, 0x91,
 		0x00, 0x8f, 0x00, 0x8e, 0x00, 0x2f, 0x00, 0x41,
 		0x00, 0x35, 0x00, 0x84, 0x00, 0x0a, 0x00, 0x05,
 		0x00, 0x04, 0x00, 0x8c, 0x00, 0x8d, 0x00, 0x8b,
-		0x00, 0x8a, 0x01, 0x00, 0x00, 0x1e, 0x00, 0x09,
+		0x00, 0x8a, 0x01, 0x00, 0x00, 0x19, 0x00, 0x09,
 		0x00, 0x03, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00,
 		0x0e, 0x00, 0x0c, 0x00, 0x00, 0x09, 0x6c, 0x6f,
-		0x63, 0x61, 0x6c, 0x68, 0x6f, 0x73, 0x74, 0xff,
-		0x01, 0x00, 0x01, 0x00,
+		0x63, 0x61, 0x6c, 0x68, 0x6f, 0x73, 0x74,
 	},
 
 	{
@@ -349,38 +409,46 @@ var rc4ServerScript = [][]byte{
 
 	{
 		0x16, 0x03, 0x01, 0x00, 0x86, 0x10, 0x00, 0x00,
-		0x82, 0x00, 0x80, 0x3c, 0x13, 0xd7, 0x12, 0xc1,
-		0x6a, 0xf0, 0x3f, 0x8c, 0xa1, 0x35, 0x5d, 0xc5,
-		0x89, 0x1e, 0x9e, 0xcd, 0x32, 0xc7, 0x9e, 0xe6,
-		0xae, 0xd5, 0xf1, 0xbf, 0x70, 0xd7, 0xa9, 0xef,
-		0x2c, 0x4c, 0xf4, 0x22, 0xbc, 0x17, 0x17, 0xaa,
-		0x05, 0xf3, 0x9f, 0x80, 0xf2, 0xe9, 0x82, 0x2f,
-		0x2a, 0x15, 0x54, 0x0d, 0x16, 0x0e, 0x77, 0x4c,
-		0x28, 0x3c, 0x03, 0x2d, 0x2d, 0xd7, 0xc8, 0x64,
-		0xd9, 0x59, 0x4b, 0x1c, 0xf4, 0xde, 0xff, 0x2f,
-		0xbc, 0x94, 0xaf, 0x18, 0x26, 0x37, 0xce, 0x4f,
-		0x84, 0x74, 0x2e, 0x45, 0x66, 0x7c, 0x0c, 0x54,
-		0x46, 0x36, 0x5f, 0x65, 0x21, 0x7b, 0x83, 0x8c,
-		0x6d, 0x76, 0xcd, 0x0d, 0x9f, 0xda, 0x1c, 0xa4,
-		0x6e, 0xfe, 0xb1, 0xf7, 0x09, 0x0d, 0xfb, 0x74,
-		0x66, 0x34, 0x99, 0x89, 0x7f, 0x5f, 0x77, 0x87,
-		0x4a, 0x66, 0x4b, 0xa9, 0x59, 0x57, 0xe3, 0x56,
-		0x0d, 0xdd, 0xd8, 0x14, 0x03, 0x01, 0x00, 0x01,
-		0x01, 0x16, 0x03, 0x01, 0x00, 0x24, 0xc0, 0x4e,
-		0xd3, 0x0f, 0xb5, 0xc0, 0x57, 0xa6, 0x18, 0x80,
-		0x80, 0x6b, 0x49, 0xfe, 0xbd, 0x3a, 0x7a, 0x2c,
-		0xef, 0x70, 0xb5, 0x1c, 0xd2, 0xdf, 0x5f, 0x78,
-		0x5a, 0xd8, 0x4f, 0xa0, 0x95, 0xb4, 0xb3, 0xb5,
-		0xaa, 0x3b,
+		0x82, 0x00, 0x80, 0x39, 0xe2, 0x0f, 0x49, 0xa0,
+		0xe6, 0xe4, 0x3b, 0x0c, 0x5f, 0xce, 0x39, 0x97,
+		0x6c, 0xb6, 0x41, 0xd9, 0xe1, 0x52, 0x8f, 0x43,
+		0xb3, 0xc6, 0x4f, 0x9a, 0xe2, 0x1e, 0xb9, 0x3b,
+		0xe3, 0x72, 0x17, 0x68, 0xb2, 0x0d, 0x7b, 0x71,
+		0x33, 0x96, 0x5c, 0xf9, 0xfe, 0x18, 0x8f, 0x2f,
+		0x2b, 0x82, 0xec, 0x03, 0xf2, 0x16, 0xa8, 0xf8,
+		0x39, 0xf9, 0xbb, 0x5a, 0xd3, 0x0c, 0xc1, 0x2a,
+		0x52, 0xa1, 0x90, 0x20, 0x6b, 0x24, 0xc9, 0x55,
+		0xee, 0x05, 0xd8, 0xb3, 0x43, 0x58, 0xf6, 0x7f,
+		0x68, 0x2d, 0xb3, 0xd1, 0x1b, 0x30, 0xaa, 0xdf,
+		0xfc, 0x85, 0xf1, 0xab, 0x14, 0x51, 0x91, 0x78,
+		0x29, 0x35, 0x65, 0xe0, 0x9c, 0xf6, 0xb7, 0x35,
+		0x33, 0xdb, 0x28, 0x93, 0x4d, 0x86, 0xbc, 0xfe,
+		0xaa, 0xd1, 0xc0, 0x2e, 0x4d, 0xec, 0xa2, 0x98,
+		0xca, 0x08, 0xb2, 0x91, 0x14, 0xde, 0x97, 0x3a,
+		0xc4, 0x6b, 0x49, 0x14, 0x03, 0x01, 0x00, 0x01,
+		0x01, 0x16, 0x03, 0x01, 0x00, 0x24, 0x7a, 0xcb,
+		0x3b, 0x0e, 0xbb, 0x7a, 0x56, 0x39, 0xaf, 0x83,
+		0xae, 0xfd, 0x25, 0xfd, 0x64, 0xb4, 0x0c, 0x0c,
+		0x17, 0x46, 0x54, 0x2c, 0x6a, 0x07, 0x83, 0xc6,
+		0x46, 0x08, 0x0b, 0xcd, 0x15, 0x53, 0xef, 0x40,
+		0x4e, 0x56,
 	},
 
 	{
 		0x14, 0x03, 0x01, 0x00, 0x01, 0x01, 0x16, 0x03,
-		0x01, 0x00, 0x24, 0x9d, 0xc9, 0xda, 0xdf, 0xeb,
-		0xc8, 0xdb, 0xf8, 0x94, 0xa5, 0xef, 0xd5, 0xfc,
-		0x89, 0x01, 0x64, 0x30, 0x77, 0x5a, 0x18, 0x4b,
-		0x16, 0x79, 0x9c, 0xf6, 0xf5, 0x09, 0x22, 0x12,
-		0x4c, 0x3e, 0xa8, 0x8e, 0x91, 0xa5, 0x24,
+		0x01, 0x00, 0x24, 0xd3, 0x72, 0xeb, 0x29, 0xb9,
+		0x15, 0x29, 0xb5, 0xe5, 0xb7, 0xef, 0x5c, 0xb2,
+		0x9d, 0xf6, 0xc8, 0x47, 0xd6, 0xa0, 0x84, 0xf0,
+		0x8c, 0xcb, 0xe6, 0xbe, 0xbc, 0xfb, 0x38, 0x90,
+		0x89, 0x60, 0xa2, 0xe8, 0xaa, 0xb3, 0x12, 0x17,
+		0x03, 0x01, 0x00, 0x21, 0x67, 0x4a, 0x3d, 0x31,
+		0x6c, 0x5a, 0x1c, 0xf9, 0x6e, 0xf1, 0xd8, 0x12,
+		0x0e, 0xb9, 0xfd, 0xfc, 0x66, 0x91, 0xd1, 0x1d,
+		0x6e, 0xe4, 0x55, 0xdd, 0x11, 0xb9, 0xb8, 0xa2,
+		0x65, 0xa1, 0x95, 0x64, 0x1c, 0x15, 0x03, 0x01,
+		0x00, 0x16, 0x9b, 0xa0, 0x24, 0xe3, 0xcb, 0xae,
+		0xad, 0x51, 0xb3, 0x63, 0x59, 0x78, 0x49, 0x24,
+		0x06, 0x6e, 0xee, 0x7a, 0xd7, 0x74, 0x53, 0x04,
 	},
 }
 
@@ -878,3 +946,625 @@ var sslv3ServerScript = [][]byte{
 		0xaf, 0xd3, 0xb7, 0xa3, 0xcc, 0x4a, 0x1d, 0x2e,
 	},
 }
+
+var clientauthTests = []clientauthTest{
+	// Server doesn't asks for cert
+	// gotest -test.run "TestRunServer" -serve -clientauth 0
+	// gnutls-cli --insecure --debug 100 -p 10443 localhost 2>&1 |
+	//   python parse-gnutls-cli-debug-log.py
+	{"NoClientCert", NoClientCert, nil,
+		[][]byte{{
+			0x16, 0x03, 0x02, 0x00, 0x7a, 0x01, 0x00, 0x00,
+			0x76, 0x03, 0x02, 0x4e, 0xe0, 0x92, 0x5d, 0xcd,
+			0xfe, 0x0c, 0x69, 0xd4, 0x7d, 0x8e, 0xa6, 0x88,
+			0xde, 0x72, 0x04, 0x29, 0x6a, 0x4a, 0x16, 0x23,
+			0xd7, 0x8f, 0xbc, 0xfa, 0x80, 0x73, 0x2e, 0x12,
+			0xb7, 0x0b, 0x39, 0x00, 0x00, 0x34, 0x00, 0x33,
+			0x00, 0x45, 0x00, 0x39, 0x00, 0x88, 0x00, 0x16,
+			0x00, 0x32, 0x00, 0x44, 0x00, 0x38, 0x00, 0x87,
+			0x00, 0x13, 0x00, 0x66, 0x00, 0x90, 0x00, 0x91,
+			0x00, 0x8f, 0x00, 0x8e, 0x00, 0x2f, 0x00, 0x41,
+			0x00, 0x35, 0x00, 0x84, 0x00, 0x0a, 0x00, 0x05,
+			0x00, 0x04, 0x00, 0x8c, 0x00, 0x8d, 0x00, 0x8b,
+			0x00, 0x8a, 0x01, 0x00, 0x00, 0x19, 0x00, 0x09,
+			0x00, 0x03, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00,
+			0x0e, 0x00, 0x0c, 0x00, 0x00, 0x09, 0x6c, 0x6f,
+			0x63, 0x61, 0x6c, 0x68, 0x6f, 0x73, 0x74,
+		},
+
+			{
+				0x16, 0x03, 0x01, 0x00, 0x2a, 0x02, 0x00, 0x00,
+				0x26, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x16,
+				0x03, 0x01, 0x02, 0xbe, 0x0b, 0x00, 0x02, 0xba,
+				0x00, 0x02, 0xb7, 0x00, 0x02, 0xb4, 0x30, 0x82,
+				0x02, 0xb0, 0x30, 0x82, 0x02, 0x19, 0xa0, 0x03,
+				0x02, 0x01, 0x02, 0x02, 0x09, 0x00, 0x85, 0xb0,
+				0xbb, 0xa4, 0x8a, 0x7f, 0xb8, 0xca, 0x30, 0x0d,
+				0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
+				0x01, 0x01, 0x05, 0x05, 0x00, 0x30, 0x45, 0x31,
+				0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06,
+				0x13, 0x02, 0x41, 0x55, 0x31, 0x13, 0x30, 0x11,
+				0x06, 0x03, 0x55, 0x04, 0x08, 0x13, 0x0a, 0x53,
+				0x6f, 0x6d, 0x65, 0x2d, 0x53, 0x74, 0x61, 0x74,
+				0x65, 0x31, 0x21, 0x30, 0x1f, 0x06, 0x03, 0x55,
+				0x04, 0x0a, 0x13, 0x18, 0x49, 0x6e, 0x74, 0x65,
+				0x72, 0x6e, 0x65, 0x74, 0x20, 0x57, 0x69, 0x64,
+				0x67, 0x69, 0x74, 0x73, 0x20, 0x50, 0x74, 0x79,
+				0x20, 0x4c, 0x74, 0x64, 0x30, 0x1e, 0x17, 0x0d,
+				0x31, 0x30, 0x30, 0x34, 0x32, 0x34, 0x30, 0x39,
+				0x30, 0x39, 0x33, 0x38, 0x5a, 0x17, 0x0d, 0x31,
+				0x31, 0x30, 0x34, 0x32, 0x34, 0x30, 0x39, 0x30,
+				0x39, 0x33, 0x38, 0x5a, 0x30, 0x45, 0x31, 0x0b,
+				0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13,
+				0x02, 0x41, 0x55, 0x31, 0x13, 0x30, 0x11, 0x06,
+				0x03, 0x55, 0x04, 0x08, 0x13, 0x0a, 0x53, 0x6f,
+				0x6d, 0x65, 0x2d, 0x53, 0x74, 0x61, 0x74, 0x65,
+				0x31, 0x21, 0x30, 0x1f, 0x06, 0x03, 0x55, 0x04,
+				0x0a, 0x13, 0x18, 0x49, 0x6e, 0x74, 0x65, 0x72,
+				0x6e, 0x65, 0x74, 0x20, 0x57, 0x69, 0x64, 0x67,
+				0x69, 0x74, 0x73, 0x20, 0x50, 0x74, 0x79, 0x20,
+				0x4c, 0x74, 0x64, 0x30, 0x81, 0x9f, 0x30, 0x0d,
+				0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
+				0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x81, 0x8d,
+				0x00, 0x30, 0x81, 0x89, 0x02, 0x81, 0x81, 0x00,
+				0xbb, 0x79, 0xd6, 0xf5, 0x17, 0xb5, 0xe5, 0xbf,
+				0x46, 0x10, 0xd0, 0xdc, 0x69, 0xbe, 0xe6, 0x2b,
+				0x07, 0x43, 0x5a, 0xd0, 0x03, 0x2d, 0x8a, 0x7a,
+				0x43, 0x85, 0xb7, 0x14, 0x52, 0xe7, 0xa5, 0x65,
+				0x4c, 0x2c, 0x78, 0xb8, 0x23, 0x8c, 0xb5, 0xb4,
+				0x82, 0xe5, 0xde, 0x1f, 0x95, 0x3b, 0x7e, 0x62,
+				0xa5, 0x2c, 0xa5, 0x33, 0xd6, 0xfe, 0x12, 0x5c,
+				0x7a, 0x56, 0xfc, 0xf5, 0x06, 0xbf, 0xfa, 0x58,
+				0x7b, 0x26, 0x3f, 0xb5, 0xcd, 0x04, 0xd3, 0xd0,
+				0xc9, 0x21, 0x96, 0x4a, 0xc7, 0xf4, 0x54, 0x9f,
+				0x5a, 0xbf, 0xef, 0x42, 0x71, 0x00, 0xfe, 0x18,
+				0x99, 0x07, 0x7f, 0x7e, 0x88, 0x7d, 0x7d, 0xf1,
+				0x04, 0x39, 0xc4, 0xa2, 0x2e, 0xdb, 0x51, 0xc9,
+				0x7c, 0xe3, 0xc0, 0x4c, 0x3b, 0x32, 0x66, 0x01,
+				0xcf, 0xaf, 0xb1, 0x1d, 0xb8, 0x71, 0x9a, 0x1d,
+				0xdb, 0xdb, 0x89, 0x6b, 0xae, 0xda, 0x2d, 0x79,
+				0x02, 0x03, 0x01, 0x00, 0x01, 0xa3, 0x81, 0xa7,
+				0x30, 0x81, 0xa4, 0x30, 0x1d, 0x06, 0x03, 0x55,
+				0x1d, 0x0e, 0x04, 0x16, 0x04, 0x14, 0xb1, 0xad,
+				0xe2, 0x85, 0x5a, 0xcf, 0xcb, 0x28, 0xdb, 0x69,
+				0xce, 0x23, 0x69, 0xde, 0xd3, 0x26, 0x8e, 0x18,
+				0x88, 0x39, 0x30, 0x75, 0x06, 0x03, 0x55, 0x1d,
+				0x23, 0x04, 0x6e, 0x30, 0x6c, 0x80, 0x14, 0xb1,
+				0xad, 0xe2, 0x85, 0x5a, 0xcf, 0xcb, 0x28, 0xdb,
+				0x69, 0xce, 0x23, 0x69, 0xde, 0xd3, 0x26, 0x8e,
+				0x18, 0x88, 0x39, 0xa1, 0x49, 0xa4, 0x47, 0x30,
+				0x45, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55,
+				0x04, 0x06, 0x13, 0x02, 0x41, 0x55, 0x31, 0x13,
+				0x30, 0x11, 0x06, 0x03, 0x55, 0x04, 0x08, 0x13,
+				0x0a, 0x53, 0x6f, 0x6d, 0x65, 0x2d, 0x53, 0x74,
+				0x61, 0x74, 0x65, 0x31, 0x21, 0x30, 0x1f, 0x06,
+				0x03, 0x55, 0x04, 0x0a, 0x13, 0x18, 0x49, 0x6e,
+				0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x20, 0x57,
+				0x69, 0x64, 0x67, 0x69, 0x74, 0x73, 0x20, 0x50,
+				0x74, 0x79, 0x20, 0x4c, 0x74, 0x64, 0x82, 0x09,
+				0x00, 0x85, 0xb0, 0xbb, 0xa4, 0x8a, 0x7f, 0xb8,
+				0xca, 0x30, 0x0c, 0x06, 0x03, 0x55, 0x1d, 0x13,
+				0x04, 0x05, 0x30, 0x03, 0x01, 0x01, 0xff, 0x30,
+				0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+				0x0d, 0x01, 0x01, 0x05, 0x05, 0x00, 0x03, 0x81,
+				0x81, 0x00, 0x08, 0x6c, 0x45, 0x24, 0xc7, 0x6b,
+				0xb1, 0x59, 0xab, 0x0c, 0x52, 0xcc, 0xf2, 0xb0,
+				0x14, 0xd7, 0x87, 0x9d, 0x7a, 0x64, 0x75, 0xb5,
+				0x5a, 0x95, 0x66, 0xe4, 0xc5, 0x2b, 0x8e, 0xae,
+				0x12, 0x66, 0x1f, 0xeb, 0x4f, 0x38, 0xb3, 0x6e,
+				0x60, 0xd3, 0x92, 0xfd, 0xf7, 0x41, 0x08, 0xb5,
+				0x25, 0x13, 0xb1, 0x18, 0x7a, 0x24, 0xfb, 0x30,
+				0x1d, 0xba, 0xed, 0x98, 0xb9, 0x17, 0xec, 0xe7,
+				0xd7, 0x31, 0x59, 0xdb, 0x95, 0xd3, 0x1d, 0x78,
+				0xea, 0x50, 0x56, 0x5c, 0xd5, 0x82, 0x5a, 0x2d,
+				0x5a, 0x5f, 0x33, 0xc4, 0xb6, 0xd8, 0xc9, 0x75,
+				0x90, 0x96, 0x8c, 0x0f, 0x52, 0x98, 0xb5, 0xcd,
+				0x98, 0x1f, 0x89, 0x20, 0x5f, 0xf2, 0xa0, 0x1c,
+				0xa3, 0x1b, 0x96, 0x94, 0xdd, 0xa9, 0xfd, 0x57,
+				0xe9, 0x70, 0xe8, 0x26, 0x6d, 0x71, 0x99, 0x9b,
+				0x26, 0x6e, 0x38, 0x50, 0x29, 0x6c, 0x90, 0xa7,
+				0xbd, 0xd9, 0x16, 0x03, 0x01, 0x00, 0x04, 0x0e,
+				0x00, 0x00, 0x00,
+			},
+
+			{
+				0x16, 0x03, 0x01, 0x00, 0x86, 0x10, 0x00, 0x00,
+				0x82, 0x00, 0x80, 0x10, 0xe1, 0x00, 0x3d, 0x0a,
+				0x6b, 0x02, 0x7f, 0x97, 0xde, 0xfb, 0x65, 0x46,
+				0x1a, 0x50, 0x4e, 0x34, 0x9a, 0xae, 0x14, 0x7e,
+				0xec, 0xef, 0x85, 0x15, 0x3b, 0x39, 0xc2, 0x45,
+				0x04, 0x40, 0x92, 0x71, 0xd6, 0x7e, 0xf6, 0xfd,
+				0x4d, 0x84, 0xf7, 0xc4, 0x77, 0x99, 0x3d, 0xe2,
+				0xc3, 0x8d, 0xb0, 0x4c, 0x74, 0xc8, 0x51, 0xec,
+				0xb2, 0xe8, 0x6b, 0xa1, 0xd2, 0x4d, 0xd8, 0x61,
+				0x92, 0x7a, 0x24, 0x57, 0x44, 0x4f, 0xa2, 0x1e,
+				0x74, 0x0b, 0x06, 0x4b, 0x80, 0x34, 0x8b, 0xfe,
+				0xc2, 0x0e, 0xc1, 0xcd, 0xab, 0x0c, 0x3f, 0x54,
+				0xe2, 0x44, 0xe9, 0x6c, 0x2b, 0xba, 0x7b, 0x64,
+				0xf1, 0x93, 0x65, 0x75, 0xf2, 0x35, 0xff, 0x27,
+				0x03, 0xd5, 0x64, 0xe6, 0x8e, 0xe7, 0x7b, 0x56,
+				0xb6, 0x61, 0x73, 0xeb, 0xa2, 0xdc, 0xa4, 0x6e,
+				0x52, 0xac, 0xbc, 0xba, 0x11, 0xa3, 0xd2, 0x61,
+				0x4a, 0xe0, 0xbb, 0x14, 0x03, 0x01, 0x00, 0x01,
+				0x01, 0x16, 0x03, 0x01, 0x00, 0x24, 0xd2, 0x5a,
+				0x0c, 0x2a, 0x27, 0x96, 0xba, 0xa9, 0x67, 0xd2,
+				0x51, 0x68, 0x32, 0x68, 0x22, 0x1f, 0xb9, 0x27,
+				0x79, 0x59, 0x28, 0xdf, 0x38, 0x1f, 0x92, 0x21,
+				0x5d, 0x0f, 0xf4, 0xc0, 0xee, 0xb7, 0x10, 0x5a,
+				0xa9, 0x45,
+			},
+
+			{
+				0x14, 0x03, 0x01, 0x00, 0x01, 0x01, 0x16, 0x03,
+				0x01, 0x00, 0x24, 0x13, 0x6f, 0x6c, 0x71, 0x83,
+				0x59, 0xcf, 0x32, 0x72, 0xe9, 0xce, 0xcc, 0x7a,
+				0x6c, 0xf0, 0x72, 0x39, 0x16, 0xae, 0x40, 0x61,
+				0xfa, 0x92, 0x4c, 0xe7, 0xf2, 0x1a, 0xd7, 0x0c,
+				0x84, 0x76, 0x6c, 0xe9, 0x11, 0x43, 0x19, 0x17,
+				0x03, 0x01, 0x00, 0x21, 0xc0, 0xa2, 0x13, 0x28,
+				0x94, 0x8c, 0x5c, 0xd6, 0x79, 0xb9, 0xfe, 0xae,
+				0x45, 0x4b, 0xc0, 0x7c, 0xae, 0x2d, 0xb4, 0x0d,
+				0x31, 0xc4, 0xad, 0x22, 0xd7, 0x1e, 0x99, 0x1c,
+				0x4c, 0x69, 0xab, 0x42, 0x61, 0x15, 0x03, 0x01,
+				0x00, 0x16, 0xe1, 0x0c, 0x67, 0xf3, 0xf4, 0xb9,
+				0x8e, 0x81, 0x8e, 0x01, 0xb8, 0xa0, 0x69, 0x8c,
+				0x03, 0x11, 0x43, 0x3e, 0xee, 0xb7, 0x4d, 0x69,
+			}}},
+	// Server asks for cert with empty CA list, client doesn't give it.
+	// gotest -test.run "TestRunServer" -serve -clientauth 1
+	// gnutls-cli --insecure --debug 100 -p 10443 localhost
+	{"RequestClientCert, none given", RequestClientCert, nil,
+		[][]byte{{
+			0x16, 0x03, 0x02, 0x00, 0x7a, 0x01, 0x00, 0x00,
+			0x76, 0x03, 0x02, 0x4e, 0xe0, 0x93, 0xe2, 0x47,
+			0x06, 0xa0, 0x61, 0x0c, 0x51, 0xdd, 0xf0, 0xef,
+			0xf4, 0x30, 0x72, 0xe1, 0xa6, 0x50, 0x68, 0x82,
+			0x3c, 0xfb, 0xcb, 0x72, 0x5e, 0x73, 0x9d, 0xda,
+			0x27, 0x35, 0x72, 0x00, 0x00, 0x34, 0x00, 0x33,
+			0x00, 0x45, 0x00, 0x39, 0x00, 0x88, 0x00, 0x16,
+			0x00, 0x32, 0x00, 0x44, 0x00, 0x38, 0x00, 0x87,
+			0x00, 0x13, 0x00, 0x66, 0x00, 0x90, 0x00, 0x91,
+			0x00, 0x8f, 0x00, 0x8e, 0x00, 0x2f, 0x00, 0x41,
+			0x00, 0x35, 0x00, 0x84, 0x00, 0x0a, 0x00, 0x05,
+			0x00, 0x04, 0x00, 0x8c, 0x00, 0x8d, 0x00, 0x8b,
+			0x00, 0x8a, 0x01, 0x00, 0x00, 0x19, 0x00, 0x09,
+			0x00, 0x03, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00,
+			0x0e, 0x00, 0x0c, 0x00, 0x00, 0x09, 0x6c, 0x6f,
+			0x63, 0x61, 0x6c, 0x68, 0x6f, 0x73, 0x74,
+		},
+
+			{
+				0x16, 0x03, 0x01, 0x00, 0x2a, 0x02, 0x00, 0x00,
+				0x26, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x16,
+				0x03, 0x01, 0x02, 0xbe, 0x0b, 0x00, 0x02, 0xba,
+				0x00, 0x02, 0xb7, 0x00, 0x02, 0xb4, 0x30, 0x82,
+				0x02, 0xb0, 0x30, 0x82, 0x02, 0x19, 0xa0, 0x03,
+				0x02, 0x01, 0x02, 0x02, 0x09, 0x00, 0x85, 0xb0,
+				0xbb, 0xa4, 0x8a, 0x7f, 0xb8, 0xca, 0x30, 0x0d,
+				0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
+				0x01, 0x01, 0x05, 0x05, 0x00, 0x30, 0x45, 0x31,
+				0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06,
+				0x13, 0x02, 0x41, 0x55, 0x31, 0x13, 0x30, 0x11,
+				0x06, 0x03, 0x55, 0x04, 0x08, 0x13, 0x0a, 0x53,
+				0x6f, 0x6d, 0x65, 0x2d, 0x53, 0x74, 0x61, 0x74,
+				0x65, 0x31, 0x21, 0x30, 0x1f, 0x06, 0x03, 0x55,
+				0x04, 0x0a, 0x13, 0x18, 0x49, 0x6e, 0x74, 0x65,
+				0x72, 0x6e, 0x65, 0x74, 0x20, 0x57, 0x69, 0x64,
+				0x67, 0x69, 0x74, 0x73, 0x20, 0x50, 0x74, 0x79,
+				0x20, 0x4c, 0x74, 0x64, 0x30, 0x1e, 0x17, 0x0d,
+				0x31, 0x30, 0x30, 0x34, 0x32, 0x34, 0x30, 0x39,
+				0x30, 0x39, 0x33, 0x38, 0x5a, 0x17, 0x0d, 0x31,
+				0x31, 0x30, 0x34, 0x32, 0x34, 0x30, 0x39, 0x30,
+				0x39, 0x33, 0x38, 0x5a, 0x30, 0x45, 0x31, 0x0b,
+				0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13,
+				0x02, 0x41, 0x55, 0x31, 0x13, 0x30, 0x11, 0x06,
+				0x03, 0x55, 0x04, 0x08, 0x13, 0x0a, 0x53, 0x6f,
+				0x6d, 0x65, 0x2d, 0x53, 0x74, 0x61, 0x74, 0x65,
+				0x31, 0x21, 0x30, 0x1f, 0x06, 0x03, 0x55, 0x04,
+				0x0a, 0x13, 0x18, 0x49, 0x6e, 0x74, 0x65, 0x72,
+				0x6e, 0x65, 0x74, 0x20, 0x57, 0x69, 0x64, 0x67,
+				0x69, 0x74, 0x73, 0x20, 0x50, 0x74, 0x79, 0x20,
+				0x4c, 0x74, 0x64, 0x30, 0x81, 0x9f, 0x30, 0x0d,
+				0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
+				0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x81, 0x8d,
+				0x00, 0x30, 0x81, 0x89, 0x02, 0x81, 0x81, 0x00,
+				0xbb, 0x79, 0xd6, 0xf5, 0x17, 0xb5, 0xe5, 0xbf,
+				0x46, 0x10, 0xd0, 0xdc, 0x69, 0xbe, 0xe6, 0x2b,
+				0x07, 0x43, 0x5a, 0xd0, 0x03, 0x2d, 0x8a, 0x7a,
+				0x43, 0x85, 0xb7, 0x14, 0x52, 0xe7, 0xa5, 0x65,
+				0x4c, 0x2c, 0x78, 0xb8, 0x23, 0x8c, 0xb5, 0xb4,
+				0x82, 0xe5, 0xde, 0x1f, 0x95, 0x3b, 0x7e, 0x62,
+				0xa5, 0x2c, 0xa5, 0x33, 0xd6, 0xfe, 0x12, 0x5c,
+				0x7a, 0x56, 0xfc, 0xf5, 0x06, 0xbf, 0xfa, 0x58,
+				0x7b, 0x26, 0x3f, 0xb5, 0xcd, 0x04, 0xd3, 0xd0,
+				0xc9, 0x21, 0x96, 0x4a, 0xc7, 0xf4, 0x54, 0x9f,
+				0x5a, 0xbf, 0xef, 0x42, 0x71, 0x00, 0xfe, 0x18,
+				0x99, 0x07, 0x7f, 0x7e, 0x88, 0x7d, 0x7d, 0xf1,
+				0x04, 0x39, 0xc4, 0xa2, 0x2e, 0xdb, 0x51, 0xc9,
+				0x7c, 0xe3, 0xc0, 0x4c, 0x3b, 0x32, 0x66, 0x01,
+				0xcf, 0xaf, 0xb1, 0x1d, 0xb8, 0x71, 0x9a, 0x1d,
+				0xdb, 0xdb, 0x89, 0x6b, 0xae, 0xda, 0x2d, 0x79,
+				0x02, 0x03, 0x01, 0x00, 0x01, 0xa3, 0x81, 0xa7,
+				0x30, 0x81, 0xa4, 0x30, 0x1d, 0x06, 0x03, 0x55,
+				0x1d, 0x0e, 0x04, 0x16, 0x04, 0x14, 0xb1, 0xad,
+				0xe2, 0x85, 0x5a, 0xcf, 0xcb, 0x28, 0xdb, 0x69,
+				0xce, 0x23, 0x69, 0xde, 0xd3, 0x26, 0x8e, 0x18,
+				0x88, 0x39, 0x30, 0x75, 0x06, 0x03, 0x55, 0x1d,
+				0x23, 0x04, 0x6e, 0x30, 0x6c, 0x80, 0x14, 0xb1,
+				0xad, 0xe2, 0x85, 0x5a, 0xcf, 0xcb, 0x28, 0xdb,
+				0x69, 0xce, 0x23, 0x69, 0xde, 0xd3, 0x26, 0x8e,
+				0x18, 0x88, 0x39, 0xa1, 0x49, 0xa4, 0x47, 0x30,
+				0x45, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55,
+				0x04, 0x06, 0x13, 0x02, 0x41, 0x55, 0x31, 0x13,
+				0x30, 0x11, 0x06, 0x03, 0x55, 0x04, 0x08, 0x13,
+				0x0a, 0x53, 0x6f, 0x6d, 0x65, 0x2d, 0x53, 0x74,
+				0x61, 0x74, 0x65, 0x31, 0x21, 0x30, 0x1f, 0x06,
+				0x03, 0x55, 0x04, 0x0a, 0x13, 0x18, 0x49, 0x6e,
+				0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x20, 0x57,
+				0x69, 0x64, 0x67, 0x69, 0x74, 0x73, 0x20, 0x50,
+				0x74, 0x79, 0x20, 0x4c, 0x74, 0x64, 0x82, 0x09,
+				0x00, 0x85, 0xb0, 0xbb, 0xa4, 0x8a, 0x7f, 0xb8,
+				0xca, 0x30, 0x0c, 0x06, 0x03, 0x55, 0x1d, 0x13,
+				0x04, 0x05, 0x30, 0x03, 0x01, 0x01, 0xff, 0x30,
+				0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+				0x0d, 0x01, 0x01, 0x05, 0x05, 0x00, 0x03, 0x81,
+				0x81, 0x00, 0x08, 0x6c, 0x45, 0x24, 0xc7, 0x6b,
+				0xb1, 0x59, 0xab, 0x0c, 0x52, 0xcc, 0xf2, 0xb0,
+				0x14, 0xd7, 0x87, 0x9d, 0x7a, 0x64, 0x75, 0xb5,
+				0x5a, 0x95, 0x66, 0xe4, 0xc5, 0x2b, 0x8e, 0xae,
+				0x12, 0x66, 0x1f, 0xeb, 0x4f, 0x38, 0xb3, 0x6e,
+				0x60, 0xd3, 0x92, 0xfd, 0xf7, 0x41, 0x08, 0xb5,
+				0x25, 0x13, 0xb1, 0x18, 0x7a, 0x24, 0xfb, 0x30,
+				0x1d, 0xba, 0xed, 0x98, 0xb9, 0x17, 0xec, 0xe7,
+				0xd7, 0x31, 0x59, 0xdb, 0x95, 0xd3, 0x1d, 0x78,
+				0xea, 0x50, 0x56, 0x5c, 0xd5, 0x82, 0x5a, 0x2d,
+				0x5a, 0x5f, 0x33, 0xc4, 0xb6, 0xd8, 0xc9, 0x75,
+				0x90, 0x96, 0x8c, 0x0f, 0x52, 0x98, 0xb5, 0xcd,
+				0x98, 0x1f, 0x89, 0x20, 0x5f, 0xf2, 0xa0, 0x1c,
+				0xa3, 0x1b, 0x96, 0x94, 0xdd, 0xa9, 0xfd, 0x57,
+				0xe9, 0x70, 0xe8, 0x26, 0x6d, 0x71, 0x99, 0x9b,
+				0x26, 0x6e, 0x38, 0x50, 0x29, 0x6c, 0x90, 0xa7,
+				0xbd, 0xd9, 0x16, 0x03, 0x01, 0x00, 0x08, 0x0d,
+				0x00, 0x00, 0x04, 0x01, 0x01, 0x00, 0x00, 0x16,
+				0x03, 0x01, 0x00, 0x04, 0x0e, 0x00, 0x00, 0x00,
+			},
+
+			{
+				0x16, 0x03, 0x01, 0x00, 0x07, 0x0b, 0x00, 0x00,
+				0x03, 0x00, 0x00, 0x00, 0x16, 0x03, 0x01, 0x00,
+				0x86, 0x10, 0x00, 0x00, 0x82, 0x00, 0x80, 0x64,
+				0x28, 0xb9, 0x3f, 0x48, 0xaf, 0x06, 0x22, 0x39,
+				0x56, 0xd8, 0x6f, 0x63, 0x5d, 0x03, 0x48, 0x63,
+				0x01, 0x13, 0xa2, 0xd6, 0x76, 0xc0, 0xab, 0xda,
+				0x25, 0x30, 0x75, 0x6c, 0xaa, 0xb4, 0xdc, 0x35,
+				0x72, 0xdc, 0xf2, 0x43, 0xe4, 0x1d, 0x82, 0xfb,
+				0x6c, 0x64, 0xe2, 0xa7, 0x8f, 0x32, 0x67, 0x6b,
+				0xcd, 0xd2, 0xb2, 0x36, 0x94, 0xbc, 0x6f, 0x46,
+				0x79, 0x29, 0x42, 0xe3, 0x1a, 0xbf, 0xfb, 0x41,
+				0xd5, 0xe3, 0xb4, 0x2a, 0xf6, 0x95, 0x6f, 0x0c,
+				0x87, 0xb9, 0x03, 0x18, 0xa1, 0xea, 0x4a, 0xe2,
+				0x2e, 0x0f, 0x50, 0x00, 0xc1, 0xe8, 0x8c, 0xc8,
+				0xa2, 0xf6, 0xa4, 0x05, 0xf4, 0x38, 0x3e, 0xd9,
+				0x6e, 0x63, 0x96, 0x0c, 0x34, 0x73, 0x90, 0x03,
+				0x55, 0xa6, 0x34, 0xb0, 0x5e, 0x8c, 0x48, 0x40,
+				0x25, 0x45, 0x84, 0xa6, 0x21, 0x3f, 0x81, 0x97,
+				0xa7, 0x11, 0x09, 0x14, 0x95, 0xa5, 0xe5, 0x14,
+				0x03, 0x01, 0x00, 0x01, 0x01, 0x16, 0x03, 0x01,
+				0x00, 0x24, 0x16, 0xaa, 0x01, 0x2c, 0xa8, 0xc1,
+				0x28, 0xaf, 0x35, 0xc1, 0xc1, 0xf3, 0x0a, 0x25,
+				0x66, 0x6e, 0x27, 0x11, 0xa3, 0xa4, 0xd9, 0xe9,
+				0xea, 0x15, 0x09, 0x9d, 0x28, 0xe3, 0x5b, 0x2b,
+				0xa6, 0x25, 0xa7, 0x14, 0x24, 0x3a,
+			},
+
+			{
+				0x14, 0x03, 0x01, 0x00, 0x01, 0x01, 0x16, 0x03,
+				0x01, 0x00, 0x24, 0x9a, 0xa8, 0xd6, 0x77, 0x46,
+				0x45, 0x68, 0x9d, 0x5d, 0xa9, 0x68, 0x03, 0xe5,
+				0xaf, 0xe8, 0xc8, 0x21, 0xc5, 0xc6, 0xc1, 0x50,
+				0xe0, 0xd8, 0x52, 0xce, 0xa3, 0x4f, 0x2d, 0xf4,
+				0xe3, 0xa7, 0x7d, 0x35, 0x80, 0x84, 0x12, 0x17,
+				0x03, 0x01, 0x00, 0x21, 0x8a, 0x82, 0x0c, 0x54,
+				0x1b, 0xeb, 0x77, 0x90, 0x2c, 0x3e, 0xbc, 0xf0,
+				0x23, 0xcc, 0xa8, 0x9f, 0x25, 0x08, 0x12, 0xed,
+				0x43, 0xf1, 0xf9, 0x06, 0xad, 0xa9, 0x4b, 0x97,
+				0x82, 0xb7, 0xc4, 0x0b, 0x4c, 0x15, 0x03, 0x01,
+				0x00, 0x16, 0x05, 0x2d, 0x9d, 0x45, 0x03, 0xb7,
+				0xc2, 0xd1, 0xb5, 0x1a, 0x43, 0xcf, 0x1a, 0x37,
+				0xf4, 0x70, 0xcc, 0xb4, 0xed, 0x07, 0x76, 0x3a,
+			}}},
+	// Server asks for cert with empty CA list, client gives one
+	// gotest -test.run "TestRunServer" -serve -clientauth 1
+	// gnutls-cli --insecure --debug 100 -p 10443 localhost
+	{"RequestClientCert, client gives it", RequestClientCert,
+		[]*x509.Certificate{clicert},
+		[][]byte{{
+			0x16, 0x03, 0x02, 0x00, 0x7a, 0x01, 0x00, 0x00,
+			0x76, 0x03, 0x02, 0x4e, 0xe7, 0x44, 0xda, 0x58,
+			0x7d, 0x46, 0x4a, 0x48, 0x97, 0x9f, 0xe5, 0x91,
+			0x11, 0x64, 0xa7, 0x1e, 0x4d, 0xb7, 0xfe, 0x9b,
+			0xc6, 0x63, 0xf8, 0xa4, 0xb5, 0x0b, 0x18, 0xb5,
+			0xbd, 0x19, 0xb3, 0x00, 0x00, 0x34, 0x00, 0x33,
+			0x00, 0x45, 0x00, 0x39, 0x00, 0x88, 0x00, 0x16,
+			0x00, 0x32, 0x00, 0x44, 0x00, 0x38, 0x00, 0x87,
+			0x00, 0x13, 0x00, 0x66, 0x00, 0x90, 0x00, 0x91,
+			0x00, 0x8f, 0x00, 0x8e, 0x00, 0x2f, 0x00, 0x41,
+			0x00, 0x35, 0x00, 0x84, 0x00, 0x0a, 0x00, 0x05,
+			0x00, 0x04, 0x00, 0x8c, 0x00, 0x8d, 0x00, 0x8b,
+			0x00, 0x8a, 0x01, 0x00, 0x00, 0x19, 0x00, 0x09,
+			0x00, 0x03, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00,
+			0x0e, 0x00, 0x0c, 0x00, 0x00, 0x09, 0x6c, 0x6f,
+			0x63, 0x61, 0x6c, 0x68, 0x6f, 0x73, 0x74,
+		},
+
+			{
+				0x16, 0x03, 0x01, 0x00, 0x2a, 0x02, 0x00, 0x00,
+				0x26, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x16,
+				0x03, 0x01, 0x02, 0xbe, 0x0b, 0x00, 0x02, 0xba,
+				0x00, 0x02, 0xb7, 0x00, 0x02, 0xb4, 0x30, 0x82,
+				0x02, 0xb0, 0x30, 0x82, 0x02, 0x19, 0xa0, 0x03,
+				0x02, 0x01, 0x02, 0x02, 0x09, 0x00, 0x85, 0xb0,
+				0xbb, 0xa4, 0x8a, 0x7f, 0xb8, 0xca, 0x30, 0x0d,
+				0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
+				0x01, 0x01, 0x05, 0x05, 0x00, 0x30, 0x45, 0x31,
+				0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06,
+				0x13, 0x02, 0x41, 0x55, 0x31, 0x13, 0x30, 0x11,
+				0x06, 0x03, 0x55, 0x04, 0x08, 0x13, 0x0a, 0x53,
+				0x6f, 0x6d, 0x65, 0x2d, 0x53, 0x74, 0x61, 0x74,
+				0x65, 0x31, 0x21, 0x30, 0x1f, 0x06, 0x03, 0x55,
+				0x04, 0x0a, 0x13, 0x18, 0x49, 0x6e, 0x74, 0x65,
+				0x72, 0x6e, 0x65, 0x74, 0x20, 0x57, 0x69, 0x64,
+				0x67, 0x69, 0x74, 0x73, 0x20, 0x50, 0x74, 0x79,
+				0x20, 0x4c, 0x74, 0x64, 0x30, 0x1e, 0x17, 0x0d,
+				0x31, 0x30, 0x30, 0x34, 0x32, 0x34, 0x30, 0x39,
+				0x30, 0x39, 0x33, 0x38, 0x5a, 0x17, 0x0d, 0x31,
+				0x31, 0x30, 0x34, 0x32, 0x34, 0x30, 0x39, 0x30,
+				0x39, 0x33, 0x38, 0x5a, 0x30, 0x45, 0x31, 0x0b,
+				0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13,
+				0x02, 0x41, 0x55, 0x31, 0x13, 0x30, 0x11, 0x06,
+				0x03, 0x55, 0x04, 0x08, 0x13, 0x0a, 0x53, 0x6f,
+				0x6d, 0x65, 0x2d, 0x53, 0x74, 0x61, 0x74, 0x65,
+				0x31, 0x21, 0x30, 0x1f, 0x06, 0x03, 0x55, 0x04,
+				0x0a, 0x13, 0x18, 0x49, 0x6e, 0x74, 0x65, 0x72,
+				0x6e, 0x65, 0x74, 0x20, 0x57, 0x69, 0x64, 0x67,
+				0x69, 0x74, 0x73, 0x20, 0x50, 0x74, 0x79, 0x20,
+				0x4c, 0x74, 0x64, 0x30, 0x81, 0x9f, 0x30, 0x0d,
+				0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d,
+				0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x81, 0x8d,
+				0x00, 0x30, 0x81, 0x89, 0x02, 0x81, 0x81, 0x00,
+				0xbb, 0x79, 0xd6, 0xf5, 0x17, 0xb5, 0xe5, 0xbf,
+				0x46, 0x10, 0xd0, 0xdc, 0x69, 0xbe, 0xe6, 0x2b,
+				0x07, 0x43, 0x5a, 0xd0, 0x03, 0x2d, 0x8a, 0x7a,
+				0x43, 0x85, 0xb7, 0x14, 0x52, 0xe7, 0xa5, 0x65,
+				0x4c, 0x2c, 0x78, 0xb8, 0x23, 0x8c, 0xb5, 0xb4,
+				0x82, 0xe5, 0xde, 0x1f, 0x95, 0x3b, 0x7e, 0x62,
+				0xa5, 0x2c, 0xa5, 0x33, 0xd6, 0xfe, 0x12, 0x5c,
+				0x7a, 0x56, 0xfc, 0xf5, 0x06, 0xbf, 0xfa, 0x58,
+				0x7b, 0x26, 0x3f, 0xb5, 0xcd, 0x04, 0xd3, 0xd0,
+				0xc9, 0x21, 0x96, 0x4a, 0xc7, 0xf4, 0x54, 0x9f,
+				0x5a, 0xbf, 0xef, 0x42, 0x71, 0x00, 0xfe, 0x18,
+				0x99, 0x07, 0x7f, 0x7e, 0x88, 0x7d, 0x7d, 0xf1,
+				0x04, 0x39, 0xc4, 0xa2, 0x2e, 0xdb, 0x51, 0xc9,
+				0x7c, 0xe3, 0xc0, 0x4c, 0x3b, 0x32, 0x66, 0x01,
+				0xcf, 0xaf, 0xb1, 0x1d, 0xb8, 0x71, 0x9a, 0x1d,
+				0xdb, 0xdb, 0x89, 0x6b, 0xae, 0xda, 0x2d, 0x79,
+				0x02, 0x03, 0x01, 0x00, 0x01, 0xa3, 0x81, 0xa7,
+				0x30, 0x81, 0xa4, 0x30, 0x1d, 0x06, 0x03, 0x55,
+				0x1d, 0x0e, 0x04, 0x16, 0x04, 0x14, 0xb1, 0xad,
+				0xe2, 0x85, 0x5a, 0xcf, 0xcb, 0x28, 0xdb, 0x69,
+				0xce, 0x23, 0x69, 0xde, 0xd3, 0x26, 0x8e, 0x18,
+				0x88, 0x39, 0x30, 0x75, 0x06, 0x03, 0x55, 0x1d,
+				0x23, 0x04, 0x6e, 0x30, 0x6c, 0x80, 0x14, 0xb1,
+				0xad, 0xe2, 0x85, 0x5a, 0xcf, 0xcb, 0x28, 0xdb,
+				0x69, 0xce, 0x23, 0x69, 0xde, 0xd3, 0x26, 0x8e,
+				0x18, 0x88, 0x39, 0xa1, 0x49, 0xa4, 0x47, 0x30,
+				0x45, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55,
+				0x04, 0x06, 0x13, 0x02, 0x41, 0x55, 0x31, 0x13,
+				0x30, 0x11, 0x06, 0x03, 0x55, 0x04, 0x08, 0x13,
+				0x0a, 0x53, 0x6f, 0x6d, 0x65, 0x2d, 0x53, 0x74,
+				0x61, 0x74, 0x65, 0x31, 0x21, 0x30, 0x1f, 0x06,
+				0x03, 0x55, 0x04, 0x0a, 0x13, 0x18, 0x49, 0x6e,
+				0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x20, 0x57,
+				0x69, 0x64, 0x67, 0x69, 0x74, 0x73, 0x20, 0x50,
+				0x74, 0x79, 0x20, 0x4c, 0x74, 0x64, 0x82, 0x09,
+				0x00, 0x85, 0xb0, 0xbb, 0xa4, 0x8a, 0x7f, 0xb8,
+				0xca, 0x30, 0x0c, 0x06, 0x03, 0x55, 0x1d, 0x13,
+				0x04, 0x05, 0x30, 0x03, 0x01, 0x01, 0xff, 0x30,
+				0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+				0x0d, 0x01, 0x01, 0x05, 0x05, 0x00, 0x03, 0x81,
+				0x81, 0x00, 0x08, 0x6c, 0x45, 0x24, 0xc7, 0x6b,
+				0xb1, 0x59, 0xab, 0x0c, 0x52, 0xcc, 0xf2, 0xb0,
+				0x14, 0xd7, 0x87, 0x9d, 0x7a, 0x64, 0x75, 0xb5,
+				0x5a, 0x95, 0x66, 0xe4, 0xc5, 0x2b, 0x8e, 0xae,
+				0x12, 0x66, 0x1f, 0xeb, 0x4f, 0x38, 0xb3, 0x6e,
+				0x60, 0xd3, 0x92, 0xfd, 0xf7, 0x41, 0x08, 0xb5,
+				0x25, 0x13, 0xb1, 0x18, 0x7a, 0x24, 0xfb, 0x30,
+				0x1d, 0xba, 0xed, 0x98, 0xb9, 0x17, 0xec, 0xe7,
+				0xd7, 0x31, 0x59, 0xdb, 0x95, 0xd3, 0x1d, 0x78,
+				0xea, 0x50, 0x56, 0x5c, 0xd5, 0x82, 0x5a, 0x2d,
+				0x5a, 0x5f, 0x33, 0xc4, 0xb6, 0xd8, 0xc9, 0x75,
+				0x90, 0x96, 0x8c, 0x0f, 0x52, 0x98, 0xb5, 0xcd,
+				0x98, 0x1f, 0x89, 0x20, 0x5f, 0xf2, 0xa0, 0x1c,
+				0xa3, 0x1b, 0x96, 0x94, 0xdd, 0xa9, 0xfd, 0x57,
+				0xe9, 0x70, 0xe8, 0x26, 0x6d, 0x71, 0x99, 0x9b,
+				0x26, 0x6e, 0x38, 0x50, 0x29, 0x6c, 0x90, 0xa7,
+				0xbd, 0xd9, 0x16, 0x03, 0x01, 0x00, 0x08, 0x0d,
+				0x00, 0x00, 0x04, 0x01, 0x01, 0x00, 0x00, 0x16,
+				0x03, 0x01, 0x00, 0x04, 0x0e, 0x00, 0x00, 0x00,
+			},
+
+			{
+				0x16, 0x03, 0x01, 0x01, 0xfb, 0x0b, 0x00, 0x01,
+				0xf7, 0x00, 0x01, 0xf4, 0x00, 0x01, 0xf1, 0x30,
+				0x82, 0x01, 0xed, 0x30, 0x82, 0x01, 0x58, 0xa0,
+				0x03, 0x02, 0x01, 0x02, 0x02, 0x01, 0x00, 0x30,
+				0x0b, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+				0x0d, 0x01, 0x01, 0x05, 0x30, 0x26, 0x31, 0x10,
+				0x30, 0x0e, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13,
+				0x07, 0x41, 0x63, 0x6d, 0x65, 0x20, 0x43, 0x6f,
+				0x31, 0x12, 0x30, 0x10, 0x06, 0x03, 0x55, 0x04,
+				0x03, 0x13, 0x09, 0x31, 0x32, 0x37, 0x2e, 0x30,
+				0x2e, 0x30, 0x2e, 0x31, 0x30, 0x1e, 0x17, 0x0d,
+				0x31, 0x31, 0x31, 0x32, 0x30, 0x38, 0x30, 0x37,
+				0x35, 0x35, 0x31, 0x32, 0x5a, 0x17, 0x0d, 0x31,
+				0x32, 0x31, 0x32, 0x30, 0x37, 0x30, 0x38, 0x30,
+				0x30, 0x31, 0x32, 0x5a, 0x30, 0x26, 0x31, 0x10,
+				0x30, 0x0e, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x13,
+				0x07, 0x41, 0x63, 0x6d, 0x65, 0x20, 0x43, 0x6f,
+				0x31, 0x12, 0x30, 0x10, 0x06, 0x03, 0x55, 0x04,
+				0x03, 0x13, 0x09, 0x31, 0x32, 0x37, 0x2e, 0x30,
+				0x2e, 0x30, 0x2e, 0x31, 0x30, 0x81, 0x9c, 0x30,
+				0x0b, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+				0x0d, 0x01, 0x01, 0x01, 0x03, 0x81, 0x8c, 0x00,
+				0x30, 0x81, 0x88, 0x02, 0x81, 0x80, 0x4e, 0xd0,
+				0x7b, 0x31, 0xe3, 0x82, 0x64, 0xd9, 0x59, 0xc0,
+				0xc2, 0x87, 0xa4, 0x5e, 0x1e, 0x8b, 0x73, 0x33,
+				0xc7, 0x63, 0x53, 0xdf, 0x66, 0x92, 0x06, 0x84,
+				0xf6, 0x64, 0xd5, 0x8f, 0xe4, 0x36, 0xa7, 0x1d,
+				0x2b, 0xe8, 0xb3, 0x20, 0x36, 0x45, 0x23, 0xb5,
+				0xe3, 0x95, 0xae, 0xed, 0xe0, 0xf5, 0x20, 0x9c,
+				0x8d, 0x95, 0xdf, 0x7f, 0x5a, 0x12, 0xef, 0x87,
+				0xe4, 0x5b, 0x68, 0xe4, 0xe9, 0x0e, 0x74, 0xec,
+				0x04, 0x8a, 0x7f, 0xde, 0x93, 0x27, 0xc4, 0x01,
+				0x19, 0x7a, 0xbd, 0xf2, 0xdc, 0x3d, 0x14, 0xab,
+				0xd0, 0x54, 0xca, 0x21, 0x0c, 0xd0, 0x4d, 0x6e,
+				0x87, 0x2e, 0x5c, 0xc5, 0xd2, 0xbb, 0x4d, 0x4b,
+				0x4f, 0xce, 0xb6, 0x2c, 0xf7, 0x7e, 0x88, 0xec,
+				0x7c, 0xd7, 0x02, 0x91, 0x74, 0xa6, 0x1e, 0x0c,
+				0x1a, 0xda, 0xe3, 0x4a, 0x5a, 0x2e, 0xde, 0x13,
+				0x9c, 0x4c, 0x40, 0x88, 0x59, 0x93, 0x02, 0x03,
+				0x01, 0x00, 0x01, 0xa3, 0x32, 0x30, 0x30, 0x30,
+				0x0e, 0x06, 0x03, 0x55, 0x1d, 0x0f, 0x01, 0x01,
+				0xff, 0x04, 0x04, 0x03, 0x02, 0x00, 0xa0, 0x30,
+				0x0d, 0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x06,
+				0x04, 0x04, 0x01, 0x02, 0x03, 0x04, 0x30, 0x0f,
+				0x06, 0x03, 0x55, 0x1d, 0x23, 0x04, 0x08, 0x30,
+				0x06, 0x80, 0x04, 0x01, 0x02, 0x03, 0x04, 0x30,
+				0x0b, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7,
+				0x0d, 0x01, 0x01, 0x05, 0x03, 0x81, 0x81, 0x00,
+				0x36, 0x1f, 0xb3, 0x7a, 0x0c, 0x75, 0xc9, 0x6e,
+				0x37, 0x46, 0x61, 0x2b, 0xd5, 0xbd, 0xc0, 0xa7,
+				0x4b, 0xcc, 0x46, 0x9a, 0x81, 0x58, 0x7c, 0x85,
+				0x79, 0x29, 0xc8, 0xc8, 0xc6, 0x67, 0xdd, 0x32,
+				0x56, 0x45, 0x2b, 0x75, 0xb6, 0xe9, 0x24, 0xa9,
+				0x50, 0x9a, 0xbe, 0x1f, 0x5a, 0xfa, 0x1a, 0x15,
+				0xd9, 0xcc, 0x55, 0x95, 0x72, 0x16, 0x83, 0xb9,
+				0xc2, 0xb6, 0x8f, 0xfd, 0x88, 0x8c, 0x38, 0x84,
+				0x1d, 0xab, 0x5d, 0x92, 0x31, 0x13, 0x4f, 0xfd,
+				0x83, 0x3b, 0xc6, 0x9d, 0xf1, 0x11, 0x62, 0xb6,
+				0x8b, 0xec, 0xab, 0x67, 0xbe, 0xc8, 0x64, 0xb0,
+				0x11, 0x50, 0x46, 0x58, 0x17, 0x6b, 0x99, 0x1c,
+				0xd3, 0x1d, 0xfc, 0x06, 0xf1, 0x0e, 0xe5, 0x96,
+				0xa8, 0x0c, 0xf9, 0x78, 0x20, 0xb7, 0x44, 0x18,
+				0x51, 0x8d, 0x10, 0x7e, 0x4f, 0x94, 0x67, 0xdf,
+				0xa3, 0x4e, 0x70, 0x73, 0x8e, 0x90, 0x91, 0x85,
+				0x16, 0x03, 0x01, 0x00, 0x86, 0x10, 0x00, 0x00,
+				0x82, 0x00, 0x80, 0xa7, 0x2f, 0xed, 0xfa, 0xc2,
+				0xbd, 0x46, 0xa1, 0xf2, 0x69, 0xc5, 0x1d, 0xa1,
+				0x34, 0xd6, 0xd0, 0x84, 0xf5, 0x5d, 0x8c, 0x82,
+				0x8d, 0x98, 0x82, 0x9c, 0xd9, 0x07, 0xe0, 0xf7,
+				0x55, 0x49, 0x4d, 0xa1, 0x48, 0x59, 0x02, 0xd3,
+				0x84, 0x37, 0xaf, 0x01, 0xb3, 0x3a, 0xf4, 0xed,
+				0x99, 0xbe, 0x67, 0x36, 0x19, 0x55, 0xf3, 0xf9,
+				0xcb, 0x94, 0xe5, 0x7b, 0x8b, 0x77, 0xf2, 0x5f,
+				0x4c, 0xfe, 0x01, 0x1f, 0x7b, 0xd7, 0x23, 0x49,
+				0x0c, 0xcb, 0x6c, 0xb0, 0xe7, 0x77, 0xd6, 0xcf,
+				0xa8, 0x7d, 0xdb, 0xa7, 0x14, 0xe2, 0xf5, 0xf3,
+				0xff, 0xba, 0x23, 0xd2, 0x9a, 0x36, 0x14, 0x60,
+				0x2a, 0x91, 0x5d, 0x2b, 0x35, 0x3b, 0xb6, 0xdd,
+				0xcb, 0x6b, 0xdc, 0x18, 0xdc, 0x33, 0xb8, 0xb3,
+				0xc7, 0x27, 0x7e, 0xfc, 0xd2, 0xf7, 0x97, 0x90,
+				0x5e, 0x17, 0xac, 0x14, 0x8e, 0x0f, 0xca, 0xb5,
+				0x6f, 0xc9, 0x2d, 0x16, 0x03, 0x01, 0x00, 0x86,
+				0x0f, 0x00, 0x00, 0x82, 0x00, 0x80, 0x44, 0x7f,
+				0xa2, 0x59, 0x60, 0x0b, 0x5a, 0xc4, 0xaf, 0x1e,
+				0x60, 0xa5, 0x24, 0xea, 0xc1, 0xc3, 0x22, 0x21,
+				0x6b, 0x22, 0x8b, 0x2a, 0x11, 0x82, 0x68, 0x7d,
+				0xb9, 0xdd, 0x9c, 0x27, 0x4c, 0xc2, 0xc8, 0xa2,
+				0x8b, 0x6b, 0x77, 0x8d, 0x3a, 0x2b, 0x8d, 0x2f,
+				0x6a, 0x2b, 0x43, 0xd2, 0xd1, 0xc6, 0x41, 0x79,
+				0xa2, 0x4f, 0x2b, 0xc2, 0xf7, 0xb2, 0x10, 0xad,
+				0xa6, 0x01, 0x51, 0x51, 0x25, 0xe7, 0x58, 0x7a,
+				0xcf, 0x3b, 0xc4, 0x29, 0xb5, 0xe5, 0xa7, 0x83,
+				0xe6, 0xcb, 0x1e, 0xf3, 0x02, 0x0f, 0x53, 0x3b,
+				0xb5, 0x39, 0xef, 0x9c, 0x42, 0xe0, 0xa6, 0x9b,
+				0x2b, 0xdd, 0x60, 0xae, 0x0a, 0x73, 0x35, 0xbe,
+				0x26, 0x10, 0x1b, 0xe9, 0xe9, 0x61, 0xab, 0x20,
+				0xa5, 0x48, 0xc6, 0x60, 0xa6, 0x50, 0x3c, 0xfb,
+				0xa7, 0xca, 0xb0, 0x80, 0x95, 0x1e, 0xce, 0xc7,
+				0xbb, 0x68, 0x44, 0xdc, 0x0e, 0x0e, 0x14, 0x03,
+				0x01, 0x00, 0x01, 0x01, 0x16, 0x03, 0x01, 0x00,
+				0x24, 0xb6, 0xcd, 0x0c, 0x78, 0xfd, 0xd6, 0xff,
+				0xbe, 0x97, 0xd5, 0x0a, 0x7d, 0x4f, 0xa1, 0x03,
+				0x78, 0xc8, 0x61, 0x6f, 0xf2, 0x4b, 0xa8, 0x56,
+				0x4f, 0x3c, 0xa2, 0xd9, 0xd0, 0x20, 0x13, 0x1b,
+				0x8b, 0x36, 0xb7, 0x33, 0x9c,
+			},
+
+			{
+				0x14, 0x03, 0x01, 0x00, 0x01, 0x01, 0x16, 0x03,
+				0x01, 0x00, 0x24, 0xa3, 0x43, 0x94, 0xe7, 0xdf,
+				0xb6, 0xc3, 0x03, 0x9f, 0xc1, 0x59, 0x0c, 0xc3,
+				0x13, 0xae, 0xed, 0xcf, 0xff, 0xf1, 0x80, 0xf3,
+				0x13, 0x63, 0x1c, 0xf0, 0xca, 0xad, 0x9e, 0x71,
+				0x46, 0x5f, 0x6b, 0xeb, 0x10, 0x3f, 0xe3, 0x17,
+				0x03, 0x01, 0x00, 0x21, 0xe9, 0x80, 0x95, 0x6e,
+				0x05, 0x55, 0x2f, 0xed, 0x4d, 0xde, 0x17, 0x3a,
+				0x32, 0x9b, 0x2a, 0x74, 0x30, 0x4f, 0xe0, 0x9f,
+				0x4e, 0xd3, 0x06, 0xbd, 0x3a, 0x43, 0x75, 0x8b,
+				0x5b, 0x9a, 0xd8, 0x2e, 0x56, 0x15, 0x03, 0x01,
+				0x00, 0x16, 0x53, 0xf5, 0xff, 0xe0, 0xa1, 0x6c,
+				0x33, 0xf4, 0x4e, 0x89, 0x68, 0xe1, 0xf7, 0x61,
+				0x13, 0xb3, 0x12, 0xa1, 0x8e, 0x5a, 0x7a, 0x02,
+			}}},
+}
+
+// cert.pem and key.pem were generated with generate_cert.go
+// Thus, they have no ExtKeyUsage fields and trigger an error
+// when verification is turned on.
+
+var clicert = loadPEMCert(`
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+`)
+
+/* corresponding key.pem for cert.pem is:
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
+*/

tls.go

@@ -120,7 +120,7 @@ func Dial(network, addr string, config *Config) (*Conn, error) {
 
 // LoadX509KeyPair reads and parses a public/private key pair from a pair of
 // files. The files must contain PEM encoded data.
-func LoadX509KeyPair(certFile string, keyFile string) (cert Certificate, err error) {
+func LoadX509KeyPair(certFile, keyFile string) (cert Certificate, err error) {
 	certPEMBlock, err := ioutil.ReadFile(certFile)
 	if err != nil {
 		return