Source file src/crypto/tls/tls_test.go

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package tls
     6  
     7  import (
     8  	"bytes"
     9  	"context"
    10  	"crypto"
    11  	"crypto/ecdsa"
    12  	"crypto/elliptic"
    13  	"crypto/rand"
    14  	"crypto/x509"
    15  	"crypto/x509/pkix"
    16  	"encoding/asn1"
    17  	"encoding/json"
    18  	"encoding/pem"
    19  	"errors"
    20  	"fmt"
    21  	"internal/testenv"
    22  	"io"
    23  	"math"
    24  	"math/big"
    25  	"net"
    26  	"os"
    27  	"reflect"
    28  	"slices"
    29  	"strings"
    30  	"testing"
    31  	"time"
    32  )
    33  
    34  var rsaCertPEM = `-----BEGIN CERTIFICATE-----
    35  MIIB0zCCAX2gAwIBAgIJAI/M7BYjwB+uMA0GCSqGSIb3DQEBBQUAMEUxCzAJBgNV
    36  BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX
    37  aWRnaXRzIFB0eSBMdGQwHhcNMTIwOTEyMjE1MjAyWhcNMTUwOTEyMjE1MjAyWjBF
    38  MQswCQYDVQQGEwJBVTETMBEGA1UECAwKU29tZS1TdGF0ZTEhMB8GA1UECgwYSW50
    39  ZXJuZXQgV2lkZ2l0cyBQdHkgTHRkMFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBANLJ
    40  hPHhITqQbPklG3ibCVxwGMRfp/v4XqhfdQHdcVfHap6NQ5Wok/4xIA+ui35/MmNa
    41  rtNuC+BdZ1tMuVCPFZcCAwEAAaNQME4wHQYDVR0OBBYEFJvKs8RfJaXTH08W+SGv
    42  zQyKn0H8MB8GA1UdIwQYMBaAFJvKs8RfJaXTH08W+SGvzQyKn0H8MAwGA1UdEwQF
    43  MAMBAf8wDQYJKoZIhvcNAQEFBQADQQBJlffJHybjDGxRMqaRmDhX0+6v02TUKZsW
    44  r5QuVbpQhH6u+0UgcW0jp9QwpxoPTLTWGXEWBBBurxFwiCBhkQ+V
    45  -----END CERTIFICATE-----
    46  `
    47  
    48  var rsaKeyPEM = testingKey(`-----BEGIN RSA TESTING KEY-----
    49  MIIBOwIBAAJBANLJhPHhITqQbPklG3ibCVxwGMRfp/v4XqhfdQHdcVfHap6NQ5Wo
    50  k/4xIA+ui35/MmNartNuC+BdZ1tMuVCPFZcCAwEAAQJAEJ2N+zsR0Xn8/Q6twa4G
    51  6OB1M1WO+k+ztnX/1SvNeWu8D6GImtupLTYgjZcHufykj09jiHmjHx8u8ZZB/o1N
    52  MQIhAPW+eyZo7ay3lMz1V01WVjNKK9QSn1MJlb06h/LuYv9FAiEA25WPedKgVyCW
    53  SmUwbPw8fnTcpqDWE3yTO3vKcebqMSsCIBF3UmVue8YU3jybC3NxuXq3wNm34R8T
    54  xVLHwDXh/6NJAiEAl2oHGGLz64BuAfjKrqwz7qMYr9HCLIe/YsoWq/olzScCIQDi
    55  D2lWusoe2/nEqfDVVWGWlyJ7yOmqaVm/iNUN9B2N2g==
    56  -----END RSA TESTING KEY-----
    57  `)
    58  
    59  // keyPEM is the same as rsaKeyPEM, but declares itself as just
    60  // "PRIVATE KEY", not "RSA PRIVATE KEY".  https://golang.org/issue/4477
    61  var keyPEM = testingKey(`-----BEGIN TESTING KEY-----
    62  MIIBOwIBAAJBANLJhPHhITqQbPklG3ibCVxwGMRfp/v4XqhfdQHdcVfHap6NQ5Wo
    63  k/4xIA+ui35/MmNartNuC+BdZ1tMuVCPFZcCAwEAAQJAEJ2N+zsR0Xn8/Q6twa4G
    64  6OB1M1WO+k+ztnX/1SvNeWu8D6GImtupLTYgjZcHufykj09jiHmjHx8u8ZZB/o1N
    65  MQIhAPW+eyZo7ay3lMz1V01WVjNKK9QSn1MJlb06h/LuYv9FAiEA25WPedKgVyCW
    66  SmUwbPw8fnTcpqDWE3yTO3vKcebqMSsCIBF3UmVue8YU3jybC3NxuXq3wNm34R8T
    67  xVLHwDXh/6NJAiEAl2oHGGLz64BuAfjKrqwz7qMYr9HCLIe/YsoWq/olzScCIQDi
    68  D2lWusoe2/nEqfDVVWGWlyJ7yOmqaVm/iNUN9B2N2g==
    69  -----END TESTING KEY-----
    70  `)
    71  
    72  var ecdsaCertPEM = `-----BEGIN CERTIFICATE-----
    73  MIIB/jCCAWICCQDscdUxw16XFDAJBgcqhkjOPQQBMEUxCzAJBgNVBAYTAkFVMRMw
    74  EQYDVQQIEwpTb21lLVN0YXRlMSEwHwYDVQQKExhJbnRlcm5ldCBXaWRnaXRzIFB0
    75  eSBMdGQwHhcNMTIxMTE0MTI0MDQ4WhcNMTUxMTE0MTI0MDQ4WjBFMQswCQYDVQQG
    76  EwJBVTETMBEGA1UECBMKU29tZS1TdGF0ZTEhMB8GA1UEChMYSW50ZXJuZXQgV2lk
    77  Z2l0cyBQdHkgTHRkMIGbMBAGByqGSM49AgEGBSuBBAAjA4GGAAQBY9+my9OoeSUR
    78  lDQdV/x8LsOuLilthhiS1Tz4aGDHIPwC1mlvnf7fg5lecYpMCrLLhauAc1UJXcgl
    79  01xoLuzgtAEAgv2P/jgytzRSpUYvgLBt1UA0leLYBy6mQQbrNEuqT3INapKIcUv8
    80  XxYP0xMEUksLPq6Ca+CRSqTtrd/23uTnapkwCQYHKoZIzj0EAQOBigAwgYYCQXJo
    81  A7Sl2nLVf+4Iu/tAX/IF4MavARKC4PPHK3zfuGfPR3oCCcsAoz3kAzOeijvd0iXb
    82  H5jBImIxPL4WxQNiBTexAkF8D1EtpYuWdlVQ80/h/f4pBcGiXPqX5h2PQSQY7hP1
    83  +jwM1FGS4fREIOvlBYr/SzzQRtwrvrzGYxDEDbsC0ZGRnA==
    84  -----END CERTIFICATE-----
    85  `
    86  
    87  var ecdsaKeyPEM = testingKey(`-----BEGIN EC PARAMETERS-----
    88  BgUrgQQAIw==
    89  -----END EC PARAMETERS-----
    90  -----BEGIN EC TESTING KEY-----
    91  MIHcAgEBBEIBrsoKp0oqcv6/JovJJDoDVSGWdirrkgCWxrprGlzB9o0X8fV675X0
    92  NwuBenXFfeZvVcwluO7/Q9wkYoPd/t3jGImgBwYFK4EEACOhgYkDgYYABAFj36bL
    93  06h5JRGUNB1X/Hwuw64uKW2GGJLVPPhoYMcg/ALWaW+d/t+DmV5xikwKssuFq4Bz
    94  VQldyCXTXGgu7OC0AQCC/Y/+ODK3NFKlRi+AsG3VQDSV4tgHLqZBBus0S6pPcg1q
    95  kohxS/xfFg/TEwRSSws+roJr4JFKpO2t3/be5OdqmQ==
    96  -----END EC TESTING KEY-----
    97  `)
    98  
    99  var keyPairTests = []struct {
   100  	algo string
   101  	cert string
   102  	key  string
   103  }{
   104  	{"ECDSA", ecdsaCertPEM, ecdsaKeyPEM},
   105  	{"RSA", rsaCertPEM, rsaKeyPEM},
   106  	{"RSA-untyped", rsaCertPEM, keyPEM}, // golang.org/issue/4477
   107  }
   108  
   109  func TestX509KeyPair(t *testing.T) {
   110  	t.Parallel()
   111  	var pem []byte
   112  	for _, test := range keyPairTests {
   113  		pem = []byte(test.cert + test.key)
   114  		if _, err := X509KeyPair(pem, pem); err != nil {
   115  			t.Errorf("Failed to load %s cert followed by %s key: %s", test.algo, test.algo, err)
   116  		}
   117  		pem = []byte(test.key + test.cert)
   118  		if _, err := X509KeyPair(pem, pem); err != nil {
   119  			t.Errorf("Failed to load %s key followed by %s cert: %s", test.algo, test.algo, err)
   120  		}
   121  	}
   122  }
   123  
   124  func TestX509KeyPairErrors(t *testing.T) {
   125  	_, err := X509KeyPair([]byte(rsaKeyPEM), []byte(rsaCertPEM))
   126  	if err == nil {
   127  		t.Fatalf("X509KeyPair didn't return an error when arguments were switched")
   128  	}
   129  	if subStr := "been switched"; !strings.Contains(err.Error(), subStr) {
   130  		t.Fatalf("Expected %q in the error when switching arguments to X509KeyPair, but the error was %q", subStr, err)
   131  	}
   132  
   133  	_, err = X509KeyPair([]byte(rsaCertPEM), []byte(rsaCertPEM))
   134  	if err == nil {
   135  		t.Fatalf("X509KeyPair didn't return an error when both arguments were certificates")
   136  	}
   137  	if subStr := "certificate"; !strings.Contains(err.Error(), subStr) {
   138  		t.Fatalf("Expected %q in the error when both arguments to X509KeyPair were certificates, but the error was %q", subStr, err)
   139  	}
   140  
   141  	const nonsensePEM = `
   142  -----BEGIN NONSENSE-----
   143  Zm9vZm9vZm9v
   144  -----END NONSENSE-----
   145  `
   146  
   147  	_, err = X509KeyPair([]byte(nonsensePEM), []byte(nonsensePEM))
   148  	if err == nil {
   149  		t.Fatalf("X509KeyPair didn't return an error when both arguments were nonsense")
   150  	}
   151  	if subStr := "NONSENSE"; !strings.Contains(err.Error(), subStr) {
   152  		t.Fatalf("Expected %q in the error when both arguments to X509KeyPair were nonsense, but the error was %q", subStr, err)
   153  	}
   154  }
   155  
   156  func TestX509MixedKeyPair(t *testing.T) {
   157  	if _, err := X509KeyPair([]byte(rsaCertPEM), []byte(ecdsaKeyPEM)); err == nil {
   158  		t.Error("Load of RSA certificate succeeded with ECDSA private key")
   159  	}
   160  	if _, err := X509KeyPair([]byte(ecdsaCertPEM), []byte(rsaKeyPEM)); err == nil {
   161  		t.Error("Load of ECDSA certificate succeeded with RSA private key")
   162  	}
   163  }
   164  
   165  func newLocalListener(t testing.TB) net.Listener {
   166  	ln, err := net.Listen("tcp", "127.0.0.1:0")
   167  	if err != nil {
   168  		ln, err = net.Listen("tcp6", "[::1]:0")
   169  	}
   170  	if err != nil {
   171  		t.Fatal(err)
   172  	}
   173  	return ln
   174  }
   175  
   176  func TestDialTimeout(t *testing.T) {
   177  	if testing.Short() {
   178  		t.Skip("skipping in short mode")
   179  	}
   180  
   181  	timeout := 100 * time.Microsecond
   182  	for !t.Failed() {
   183  		acceptc := make(chan net.Conn)
   184  		listener := newLocalListener(t)
   185  		go func() {
   186  			for {
   187  				conn, err := listener.Accept()
   188  				if err != nil {
   189  					close(acceptc)
   190  					return
   191  				}
   192  				acceptc <- conn
   193  			}
   194  		}()
   195  
   196  		addr := listener.Addr().String()
   197  		dialer := &net.Dialer{
   198  			Timeout: timeout,
   199  		}
   200  		if conn, err := DialWithDialer(dialer, "tcp", addr, nil); err == nil {
   201  			conn.Close()
   202  			t.Errorf("DialWithTimeout unexpectedly completed successfully")
   203  		} else if !isTimeoutError(err) {
   204  			t.Errorf("resulting error not a timeout: %v\nType %T: %#v", err, err, err)
   205  		}
   206  
   207  		listener.Close()
   208  
   209  		// We're looking for a timeout during the handshake, so check that the
   210  		// Listener actually accepted the connection to initiate it. (If the server
   211  		// takes too long to accept the connection, we might cancel before the
   212  		// underlying net.Conn is ever dialed — without ever attempting a
   213  		// handshake.)
   214  		lconn, ok := <-acceptc
   215  		if ok {
   216  			// The Listener accepted a connection, so assume that it was from our
   217  			// Dial: we triggered the timeout at the point where we wanted it!
   218  			t.Logf("Listener accepted a connection from %s", lconn.RemoteAddr())
   219  			lconn.Close()
   220  		}
   221  		// Close any spurious extra connections from the listener. (This is
   222  		// possible if there are, for example, stray Dial calls from other tests.)
   223  		for extraConn := range acceptc {
   224  			t.Logf("spurious extra connection from %s", extraConn.RemoteAddr())
   225  			extraConn.Close()
   226  		}
   227  		if ok {
   228  			break
   229  		}
   230  
   231  		t.Logf("with timeout %v, DialWithDialer returned before listener accepted any connections; retrying", timeout)
   232  		timeout *= 2
   233  	}
   234  }
   235  
   236  func TestDeadlineOnWrite(t *testing.T) {
   237  	if testing.Short() {
   238  		t.Skip("skipping in short mode")
   239  	}
   240  
   241  	ln := newLocalListener(t)
   242  	defer ln.Close()
   243  
   244  	srvCh := make(chan *Conn, 1)
   245  
   246  	go func() {
   247  		sconn, err := ln.Accept()
   248  		if err != nil {
   249  			srvCh <- nil
   250  			return
   251  		}
   252  		srv := Server(sconn, testConfig.Clone())
   253  		if err := srv.Handshake(); err != nil {
   254  			srvCh <- nil
   255  			return
   256  		}
   257  		srvCh <- srv
   258  	}()
   259  
   260  	clientConfig := testConfig.Clone()
   261  	clientConfig.MaxVersion = VersionTLS12
   262  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
   263  	if err != nil {
   264  		t.Fatal(err)
   265  	}
   266  	defer conn.Close()
   267  
   268  	srv := <-srvCh
   269  	if srv == nil {
   270  		t.Error(err)
   271  	}
   272  
   273  	// Make sure the client/server is setup correctly and is able to do a typical Write/Read
   274  	buf := make([]byte, 6)
   275  	if _, err := srv.Write([]byte("foobar")); err != nil {
   276  		t.Errorf("Write err: %v", err)
   277  	}
   278  	if n, err := conn.Read(buf); n != 6 || err != nil || string(buf) != "foobar" {
   279  		t.Errorf("Read = %d, %v, data %q; want 6, nil, foobar", n, err, buf)
   280  	}
   281  
   282  	// Set a deadline which should cause Write to timeout
   283  	if err = srv.SetDeadline(time.Now()); err != nil {
   284  		t.Fatalf("SetDeadline(time.Now()) err: %v", err)
   285  	}
   286  	if _, err = srv.Write([]byte("should fail")); err == nil {
   287  		t.Fatal("Write should have timed out")
   288  	}
   289  
   290  	// Clear deadline and make sure it still times out
   291  	if err = srv.SetDeadline(time.Time{}); err != nil {
   292  		t.Fatalf("SetDeadline(time.Time{}) err: %v", err)
   293  	}
   294  	if _, err = srv.Write([]byte("This connection is permanently broken")); err == nil {
   295  		t.Fatal("Write which previously failed should still time out")
   296  	}
   297  
   298  	// Verify the error
   299  	if ne := err.(net.Error); ne.Temporary() != false {
   300  		t.Error("Write timed out but incorrectly classified the error as Temporary")
   301  	}
   302  	if !isTimeoutError(err) {
   303  		t.Error("Write timed out but did not classify the error as a Timeout")
   304  	}
   305  }
   306  
   307  type readerFunc func([]byte) (int, error)
   308  
   309  func (f readerFunc) Read(b []byte) (int, error) { return f(b) }
   310  
   311  // TestDialer tests that tls.Dialer.DialContext can abort in the middle of a handshake.
   312  // (The other cases are all handled by the existing dial tests in this package, which
   313  // all also flow through the same code shared code paths)
   314  func TestDialer(t *testing.T) {
   315  	ln := newLocalListener(t)
   316  	defer ln.Close()
   317  
   318  	unblockServer := make(chan struct{}) // close-only
   319  	defer close(unblockServer)
   320  	go func() {
   321  		conn, err := ln.Accept()
   322  		if err != nil {
   323  			return
   324  		}
   325  		defer conn.Close()
   326  		<-unblockServer
   327  	}()
   328  
   329  	ctx, cancel := context.WithCancel(context.Background())
   330  	d := Dialer{Config: &Config{
   331  		Rand: readerFunc(func(b []byte) (n int, err error) {
   332  			// By the time crypto/tls wants randomness, that means it has a TCP
   333  			// connection, so we're past the Dialer's dial and now blocked
   334  			// in a handshake. Cancel our context and see if we get unstuck.
   335  			// (Our TCP listener above never reads or writes, so the Handshake
   336  			// would otherwise be stuck forever)
   337  			cancel()
   338  			return len(b), nil
   339  		}),
   340  		ServerName: "foo",
   341  	}}
   342  	_, err := d.DialContext(ctx, "tcp", ln.Addr().String())
   343  	if err != context.Canceled {
   344  		t.Errorf("err = %v; want context.Canceled", err)
   345  	}
   346  }
   347  
   348  func isTimeoutError(err error) bool {
   349  	if ne, ok := err.(net.Error); ok {
   350  		return ne.Timeout()
   351  	}
   352  	return false
   353  }
   354  
   355  // tests that Conn.Read returns (non-zero, io.EOF) instead of
   356  // (non-zero, nil) when a Close (alertCloseNotify) is sitting right
   357  // behind the application data in the buffer.
   358  func TestConnReadNonzeroAndEOF(t *testing.T) {
   359  	// This test is racy: it assumes that after a write to a
   360  	// localhost TCP connection, the peer TCP connection can
   361  	// immediately read it. Because it's racy, we skip this test
   362  	// in short mode, and then retry it several times with an
   363  	// increasing sleep in between our final write (via srv.Close
   364  	// below) and the following read.
   365  	if testing.Short() {
   366  		t.Skip("skipping in short mode")
   367  	}
   368  	var err error
   369  	for delay := time.Millisecond; delay <= 64*time.Millisecond; delay *= 2 {
   370  		if err = testConnReadNonzeroAndEOF(t, delay); err == nil {
   371  			return
   372  		}
   373  	}
   374  	t.Error(err)
   375  }
   376  
   377  func testConnReadNonzeroAndEOF(t *testing.T, delay time.Duration) error {
   378  	ln := newLocalListener(t)
   379  	defer ln.Close()
   380  
   381  	srvCh := make(chan *Conn, 1)
   382  	var serr error
   383  	go func() {
   384  		sconn, err := ln.Accept()
   385  		if err != nil {
   386  			serr = err
   387  			srvCh <- nil
   388  			return
   389  		}
   390  		serverConfig := testConfig.Clone()
   391  		srv := Server(sconn, serverConfig)
   392  		if err := srv.Handshake(); err != nil {
   393  			serr = fmt.Errorf("handshake: %v", err)
   394  			srvCh <- nil
   395  			return
   396  		}
   397  		srvCh <- srv
   398  	}()
   399  
   400  	clientConfig := testConfig.Clone()
   401  	// In TLS 1.3, alerts are encrypted and disguised as application data, so
   402  	// the opportunistic peek won't work.
   403  	clientConfig.MaxVersion = VersionTLS12
   404  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
   405  	if err != nil {
   406  		t.Fatal(err)
   407  	}
   408  	defer conn.Close()
   409  
   410  	srv := <-srvCh
   411  	if srv == nil {
   412  		return serr
   413  	}
   414  
   415  	buf := make([]byte, 6)
   416  
   417  	srv.Write([]byte("foobar"))
   418  	n, err := conn.Read(buf)
   419  	if n != 6 || err != nil || string(buf) != "foobar" {
   420  		return fmt.Errorf("Read = %d, %v, data %q; want 6, nil, foobar", n, err, buf)
   421  	}
   422  
   423  	srv.Write([]byte("abcdef"))
   424  	srv.Close()
   425  	time.Sleep(delay)
   426  	n, err = conn.Read(buf)
   427  	if n != 6 || string(buf) != "abcdef" {
   428  		return fmt.Errorf("Read = %d, buf= %q; want 6, abcdef", n, buf)
   429  	}
   430  	if err != io.EOF {
   431  		return fmt.Errorf("Second Read error = %v; want io.EOF", err)
   432  	}
   433  	return nil
   434  }
   435  
   436  func TestTLSUniqueMatches(t *testing.T) {
   437  	ln := newLocalListener(t)
   438  	defer ln.Close()
   439  
   440  	serverTLSUniques := make(chan []byte)
   441  	parentDone := make(chan struct{})
   442  	childDone := make(chan struct{})
   443  	defer close(parentDone)
   444  	go func() {
   445  		defer close(childDone)
   446  		for i := 0; i < 2; i++ {
   447  			sconn, err := ln.Accept()
   448  			if err != nil {
   449  				t.Error(err)
   450  				return
   451  			}
   452  			serverConfig := testConfig.Clone()
   453  			serverConfig.MaxVersion = VersionTLS12 // TLSUnique is not defined in TLS 1.3
   454  			srv := Server(sconn, serverConfig)
   455  			if err := srv.Handshake(); err != nil {
   456  				t.Error(err)
   457  				return
   458  			}
   459  			select {
   460  			case <-parentDone:
   461  				return
   462  			case serverTLSUniques <- srv.ConnectionState().TLSUnique:
   463  			}
   464  		}
   465  	}()
   466  
   467  	clientConfig := testConfig.Clone()
   468  	clientConfig.ClientSessionCache = NewLRUClientSessionCache(1)
   469  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
   470  	if err != nil {
   471  		t.Fatal(err)
   472  	}
   473  
   474  	var serverTLSUniquesValue []byte
   475  	select {
   476  	case <-childDone:
   477  		return
   478  	case serverTLSUniquesValue = <-serverTLSUniques:
   479  	}
   480  
   481  	if !bytes.Equal(conn.ConnectionState().TLSUnique, serverTLSUniquesValue) {
   482  		t.Error("client and server channel bindings differ")
   483  	}
   484  	if serverTLSUniquesValue == nil || bytes.Equal(serverTLSUniquesValue, make([]byte, 12)) {
   485  		t.Error("tls-unique is empty or zero")
   486  	}
   487  	conn.Close()
   488  
   489  	conn, err = Dial("tcp", ln.Addr().String(), clientConfig)
   490  	if err != nil {
   491  		t.Fatal(err)
   492  	}
   493  	defer conn.Close()
   494  	if !conn.ConnectionState().DidResume {
   495  		t.Error("second session did not use resumption")
   496  	}
   497  
   498  	select {
   499  	case <-childDone:
   500  		return
   501  	case serverTLSUniquesValue = <-serverTLSUniques:
   502  	}
   503  
   504  	if !bytes.Equal(conn.ConnectionState().TLSUnique, serverTLSUniquesValue) {
   505  		t.Error("client and server channel bindings differ when session resumption is used")
   506  	}
   507  	if serverTLSUniquesValue == nil || bytes.Equal(serverTLSUniquesValue, make([]byte, 12)) {
   508  		t.Error("resumption tls-unique is empty or zero")
   509  	}
   510  }
   511  
   512  func TestVerifyHostname(t *testing.T) {
   513  	testenv.MustHaveExternalNetwork(t)
   514  
   515  	c, err := Dial("tcp", "www.google.com:https", nil)
   516  	if err != nil {
   517  		t.Fatal(err)
   518  	}
   519  	if err := c.VerifyHostname("www.google.com"); err != nil {
   520  		t.Fatalf("verify www.google.com: %v", err)
   521  	}
   522  	if err := c.VerifyHostname("www.yahoo.com"); err == nil {
   523  		t.Fatalf("verify www.yahoo.com succeeded")
   524  	}
   525  
   526  	c, err = Dial("tcp", "www.google.com:https", &Config{InsecureSkipVerify: true})
   527  	if err != nil {
   528  		t.Fatal(err)
   529  	}
   530  	if err := c.VerifyHostname("www.google.com"); err == nil {
   531  		t.Fatalf("verify www.google.com succeeded with InsecureSkipVerify=true")
   532  	}
   533  }
   534  
   535  func TestConnCloseBreakingWrite(t *testing.T) {
   536  	ln := newLocalListener(t)
   537  	defer ln.Close()
   538  
   539  	srvCh := make(chan *Conn, 1)
   540  	var serr error
   541  	var sconn net.Conn
   542  	go func() {
   543  		var err error
   544  		sconn, err = ln.Accept()
   545  		if err != nil {
   546  			serr = err
   547  			srvCh <- nil
   548  			return
   549  		}
   550  		serverConfig := testConfig.Clone()
   551  		srv := Server(sconn, serverConfig)
   552  		if err := srv.Handshake(); err != nil {
   553  			serr = fmt.Errorf("handshake: %v", err)
   554  			srvCh <- nil
   555  			return
   556  		}
   557  		srvCh <- srv
   558  	}()
   559  
   560  	cconn, err := net.Dial("tcp", ln.Addr().String())
   561  	if err != nil {
   562  		t.Fatal(err)
   563  	}
   564  	defer cconn.Close()
   565  
   566  	conn := &changeImplConn{
   567  		Conn: cconn,
   568  	}
   569  
   570  	clientConfig := testConfig.Clone()
   571  	tconn := Client(conn, clientConfig)
   572  	if err := tconn.Handshake(); err != nil {
   573  		t.Fatal(err)
   574  	}
   575  
   576  	srv := <-srvCh
   577  	if srv == nil {
   578  		t.Fatal(serr)
   579  	}
   580  	defer sconn.Close()
   581  
   582  	connClosed := make(chan struct{})
   583  	conn.closeFunc = func() error {
   584  		close(connClosed)
   585  		return nil
   586  	}
   587  
   588  	inWrite := make(chan bool, 1)
   589  	var errConnClosed = errors.New("conn closed for test")
   590  	conn.writeFunc = func(p []byte) (n int, err error) {
   591  		inWrite <- true
   592  		<-connClosed
   593  		return 0, errConnClosed
   594  	}
   595  
   596  	closeReturned := make(chan bool, 1)
   597  	go func() {
   598  		<-inWrite
   599  		tconn.Close() // test that this doesn't block forever.
   600  		closeReturned <- true
   601  	}()
   602  
   603  	_, err = tconn.Write([]byte("foo"))
   604  	if err != errConnClosed {
   605  		t.Errorf("Write error = %v; want errConnClosed", err)
   606  	}
   607  
   608  	<-closeReturned
   609  	if err := tconn.Close(); err != net.ErrClosed {
   610  		t.Errorf("Close error = %v; want net.ErrClosed", err)
   611  	}
   612  }
   613  
   614  func TestConnCloseWrite(t *testing.T) {
   615  	ln := newLocalListener(t)
   616  	defer ln.Close()
   617  
   618  	clientDoneChan := make(chan struct{})
   619  
   620  	serverCloseWrite := func() error {
   621  		sconn, err := ln.Accept()
   622  		if err != nil {
   623  			return fmt.Errorf("accept: %v", err)
   624  		}
   625  		defer sconn.Close()
   626  
   627  		serverConfig := testConfig.Clone()
   628  		srv := Server(sconn, serverConfig)
   629  		if err := srv.Handshake(); err != nil {
   630  			return fmt.Errorf("handshake: %v", err)
   631  		}
   632  		defer srv.Close()
   633  
   634  		data, err := io.ReadAll(srv)
   635  		if err != nil {
   636  			return err
   637  		}
   638  		if len(data) > 0 {
   639  			return fmt.Errorf("Read data = %q; want nothing", data)
   640  		}
   641  
   642  		if err := srv.CloseWrite(); err != nil {
   643  			return fmt.Errorf("server CloseWrite: %v", err)
   644  		}
   645  
   646  		// Wait for clientCloseWrite to finish, so we know we
   647  		// tested the CloseWrite before we defer the
   648  		// sconn.Close above, which would also cause the
   649  		// client to unblock like CloseWrite.
   650  		<-clientDoneChan
   651  		return nil
   652  	}
   653  
   654  	clientCloseWrite := func() error {
   655  		defer close(clientDoneChan)
   656  
   657  		clientConfig := testConfig.Clone()
   658  		conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
   659  		if err != nil {
   660  			return err
   661  		}
   662  		if err := conn.Handshake(); err != nil {
   663  			return err
   664  		}
   665  		defer conn.Close()
   666  
   667  		if err := conn.CloseWrite(); err != nil {
   668  			return fmt.Errorf("client CloseWrite: %v", err)
   669  		}
   670  
   671  		if _, err := conn.Write([]byte{0}); err != errShutdown {
   672  			return fmt.Errorf("CloseWrite error = %v; want errShutdown", err)
   673  		}
   674  
   675  		data, err := io.ReadAll(conn)
   676  		if err != nil {
   677  			return err
   678  		}
   679  		if len(data) > 0 {
   680  			return fmt.Errorf("Read data = %q; want nothing", data)
   681  		}
   682  		return nil
   683  	}
   684  
   685  	errChan := make(chan error, 2)
   686  
   687  	go func() { errChan <- serverCloseWrite() }()
   688  	go func() { errChan <- clientCloseWrite() }()
   689  
   690  	for i := 0; i < 2; i++ {
   691  		select {
   692  		case err := <-errChan:
   693  			if err != nil {
   694  				t.Fatal(err)
   695  			}
   696  		case <-time.After(10 * time.Second):
   697  			t.Fatal("deadlock")
   698  		}
   699  	}
   700  
   701  	// Also test CloseWrite being called before the handshake is
   702  	// finished:
   703  	{
   704  		ln2 := newLocalListener(t)
   705  		defer ln2.Close()
   706  
   707  		netConn, err := net.Dial("tcp", ln2.Addr().String())
   708  		if err != nil {
   709  			t.Fatal(err)
   710  		}
   711  		defer netConn.Close()
   712  		conn := Client(netConn, testConfig.Clone())
   713  
   714  		if err := conn.CloseWrite(); err != errEarlyCloseWrite {
   715  			t.Errorf("CloseWrite error = %v; want errEarlyCloseWrite", err)
   716  		}
   717  	}
   718  }
   719  
   720  func TestWarningAlertFlood(t *testing.T) {
   721  	ln := newLocalListener(t)
   722  	defer ln.Close()
   723  
   724  	server := func() error {
   725  		sconn, err := ln.Accept()
   726  		if err != nil {
   727  			return fmt.Errorf("accept: %v", err)
   728  		}
   729  		defer sconn.Close()
   730  
   731  		serverConfig := testConfig.Clone()
   732  		srv := Server(sconn, serverConfig)
   733  		if err := srv.Handshake(); err != nil {
   734  			return fmt.Errorf("handshake: %v", err)
   735  		}
   736  		defer srv.Close()
   737  
   738  		_, err = io.ReadAll(srv)
   739  		if err == nil {
   740  			return errors.New("unexpected lack of error from server")
   741  		}
   742  		const expected = "too many ignored"
   743  		if str := err.Error(); !strings.Contains(str, expected) {
   744  			return fmt.Errorf("expected error containing %q, but saw: %s", expected, str)
   745  		}
   746  
   747  		return nil
   748  	}
   749  
   750  	errChan := make(chan error, 1)
   751  	go func() { errChan <- server() }()
   752  
   753  	clientConfig := testConfig.Clone()
   754  	clientConfig.MaxVersion = VersionTLS12 // there are no warning alerts in TLS 1.3
   755  	conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
   756  	if err != nil {
   757  		t.Fatal(err)
   758  	}
   759  	defer conn.Close()
   760  	if err := conn.Handshake(); err != nil {
   761  		t.Fatal(err)
   762  	}
   763  
   764  	for i := 0; i < maxUselessRecords+1; i++ {
   765  		conn.sendAlert(alertNoRenegotiation)
   766  	}
   767  
   768  	if err := <-errChan; err != nil {
   769  		t.Fatal(err)
   770  	}
   771  }
   772  
   773  func TestCloneFuncFields(t *testing.T) {
   774  	const expectedCount = 9
   775  	called := 0
   776  
   777  	c1 := Config{
   778  		Time: func() time.Time {
   779  			called |= 1 << 0
   780  			return time.Time{}
   781  		},
   782  		GetCertificate: func(*ClientHelloInfo) (*Certificate, error) {
   783  			called |= 1 << 1
   784  			return nil, nil
   785  		},
   786  		GetClientCertificate: func(*CertificateRequestInfo) (*Certificate, error) {
   787  			called |= 1 << 2
   788  			return nil, nil
   789  		},
   790  		GetConfigForClient: func(*ClientHelloInfo) (*Config, error) {
   791  			called |= 1 << 3
   792  			return nil, nil
   793  		},
   794  		VerifyPeerCertificate: func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
   795  			called |= 1 << 4
   796  			return nil
   797  		},
   798  		VerifyConnection: func(ConnectionState) error {
   799  			called |= 1 << 5
   800  			return nil
   801  		},
   802  		UnwrapSession: func(identity []byte, cs ConnectionState) (*SessionState, error) {
   803  			called |= 1 << 6
   804  			return nil, nil
   805  		},
   806  		WrapSession: func(cs ConnectionState, ss *SessionState) ([]byte, error) {
   807  			called |= 1 << 7
   808  			return nil, nil
   809  		},
   810  		EncryptedClientHelloRejectionVerify: func(ConnectionState) error {
   811  			called |= 1 << 8
   812  			return nil
   813  		},
   814  	}
   815  
   816  	c2 := c1.Clone()
   817  
   818  	c2.Time()
   819  	c2.GetCertificate(nil)
   820  	c2.GetClientCertificate(nil)
   821  	c2.GetConfigForClient(nil)
   822  	c2.VerifyPeerCertificate(nil, nil)
   823  	c2.VerifyConnection(ConnectionState{})
   824  	c2.UnwrapSession(nil, ConnectionState{})
   825  	c2.WrapSession(ConnectionState{}, nil)
   826  	c2.EncryptedClientHelloRejectionVerify(ConnectionState{})
   827  
   828  	if called != (1<<expectedCount)-1 {
   829  		t.Fatalf("expected %d calls but saw calls %b", expectedCount, called)
   830  	}
   831  }
   832  
   833  func TestCloneNonFuncFields(t *testing.T) {
   834  	var c1 Config
   835  	v := reflect.ValueOf(&c1).Elem()
   836  
   837  	typ := v.Type()
   838  	for i := 0; i < typ.NumField(); i++ {
   839  		f := v.Field(i)
   840  		// testing/quick can't handle functions or interfaces and so
   841  		// isn't used here.
   842  		switch fn := typ.Field(i).Name; fn {
   843  		case "Rand":
   844  			f.Set(reflect.ValueOf(io.Reader(os.Stdin)))
   845  		case "Time", "GetCertificate", "GetConfigForClient", "VerifyPeerCertificate", "VerifyConnection", "GetClientCertificate", "WrapSession", "UnwrapSession", "EncryptedClientHelloRejectionVerify":
   846  			// DeepEqual can't compare functions. If you add a
   847  			// function field to this list, you must also change
   848  			// TestCloneFuncFields to ensure that the func field is
   849  			// cloned.
   850  		case "Certificates":
   851  			f.Set(reflect.ValueOf([]Certificate{
   852  				{Certificate: [][]byte{{'b'}}},
   853  			}))
   854  		case "NameToCertificate":
   855  			f.Set(reflect.ValueOf(map[string]*Certificate{"a": nil}))
   856  		case "RootCAs", "ClientCAs":
   857  			f.Set(reflect.ValueOf(x509.NewCertPool()))
   858  		case "ClientSessionCache":
   859  			f.Set(reflect.ValueOf(NewLRUClientSessionCache(10)))
   860  		case "KeyLogWriter":
   861  			f.Set(reflect.ValueOf(io.Writer(os.Stdout)))
   862  		case "NextProtos":
   863  			f.Set(reflect.ValueOf([]string{"a", "b"}))
   864  		case "ServerName":
   865  			f.Set(reflect.ValueOf("b"))
   866  		case "ClientAuth":
   867  			f.Set(reflect.ValueOf(VerifyClientCertIfGiven))
   868  		case "InsecureSkipVerify", "SessionTicketsDisabled", "DynamicRecordSizingDisabled", "PreferServerCipherSuites":
   869  			f.Set(reflect.ValueOf(true))
   870  		case "MinVersion", "MaxVersion":
   871  			f.Set(reflect.ValueOf(uint16(VersionTLS12)))
   872  		case "SessionTicketKey":
   873  			f.Set(reflect.ValueOf([32]byte{}))
   874  		case "CipherSuites":
   875  			f.Set(reflect.ValueOf([]uint16{1, 2}))
   876  		case "CurvePreferences":
   877  			f.Set(reflect.ValueOf([]CurveID{CurveP256}))
   878  		case "Renegotiation":
   879  			f.Set(reflect.ValueOf(RenegotiateOnceAsClient))
   880  		case "EncryptedClientHelloConfigList":
   881  			f.Set(reflect.ValueOf([]byte{'x'}))
   882  		case "mutex", "autoSessionTicketKeys", "sessionTicketKeys":
   883  			continue // these are unexported fields that are handled separately
   884  		default:
   885  			t.Errorf("all fields must be accounted for, but saw unknown field %q", fn)
   886  		}
   887  	}
   888  	// Set the unexported fields related to session ticket keys, which are copied with Clone().
   889  	c1.autoSessionTicketKeys = []ticketKey{c1.ticketKeyFromBytes(c1.SessionTicketKey)}
   890  	c1.sessionTicketKeys = []ticketKey{c1.ticketKeyFromBytes(c1.SessionTicketKey)}
   891  
   892  	c2 := c1.Clone()
   893  	if !reflect.DeepEqual(&c1, c2) {
   894  		t.Errorf("clone failed to copy a field")
   895  	}
   896  }
   897  
   898  func TestCloneNilConfig(t *testing.T) {
   899  	var config *Config
   900  	if cc := config.Clone(); cc != nil {
   901  		t.Fatalf("Clone with nil should return nil, got: %+v", cc)
   902  	}
   903  }
   904  
   905  // changeImplConn is a net.Conn which can change its Write and Close
   906  // methods.
   907  type changeImplConn struct {
   908  	net.Conn
   909  	writeFunc func([]byte) (int, error)
   910  	closeFunc func() error
   911  }
   912  
   913  func (w *changeImplConn) Write(p []byte) (n int, err error) {
   914  	if w.writeFunc != nil {
   915  		return w.writeFunc(p)
   916  	}
   917  	return w.Conn.Write(p)
   918  }
   919  
   920  func (w *changeImplConn) Close() error {
   921  	if w.closeFunc != nil {
   922  		return w.closeFunc()
   923  	}
   924  	return w.Conn.Close()
   925  }
   926  
   927  func throughput(b *testing.B, version uint16, totalBytes int64, dynamicRecordSizingDisabled bool) {
   928  	ln := newLocalListener(b)
   929  	defer ln.Close()
   930  
   931  	N := b.N
   932  
   933  	// Less than 64KB because Windows appears to use a TCP rwin < 64KB.
   934  	// See Issue #15899.
   935  	const bufsize = 32 << 10
   936  
   937  	go func() {
   938  		buf := make([]byte, bufsize)
   939  		for i := 0; i < N; i++ {
   940  			sconn, err := ln.Accept()
   941  			if err != nil {
   942  				// panic rather than synchronize to avoid benchmark overhead
   943  				// (cannot call b.Fatal in goroutine)
   944  				panic(fmt.Errorf("accept: %v", err))
   945  			}
   946  			serverConfig := testConfig.Clone()
   947  			serverConfig.CipherSuites = nil // the defaults may prefer faster ciphers
   948  			serverConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
   949  			srv := Server(sconn, serverConfig)
   950  			if err := srv.Handshake(); err != nil {
   951  				panic(fmt.Errorf("handshake: %v", err))
   952  			}
   953  			if _, err := io.CopyBuffer(srv, srv, buf); err != nil {
   954  				panic(fmt.Errorf("copy buffer: %v", err))
   955  			}
   956  		}
   957  	}()
   958  
   959  	b.SetBytes(totalBytes)
   960  	clientConfig := testConfig.Clone()
   961  	clientConfig.CipherSuites = nil // the defaults may prefer faster ciphers
   962  	clientConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
   963  	clientConfig.MaxVersion = version
   964  
   965  	buf := make([]byte, bufsize)
   966  	chunks := int(math.Ceil(float64(totalBytes) / float64(len(buf))))
   967  	for i := 0; i < N; i++ {
   968  		conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
   969  		if err != nil {
   970  			b.Fatal(err)
   971  		}
   972  		for j := 0; j < chunks; j++ {
   973  			_, err := conn.Write(buf)
   974  			if err != nil {
   975  				b.Fatal(err)
   976  			}
   977  			_, err = io.ReadFull(conn, buf)
   978  			if err != nil {
   979  				b.Fatal(err)
   980  			}
   981  		}
   982  		conn.Close()
   983  	}
   984  }
   985  
   986  func BenchmarkThroughput(b *testing.B) {
   987  	for _, mode := range []string{"Max", "Dynamic"} {
   988  		for size := 1; size <= 64; size <<= 1 {
   989  			name := fmt.Sprintf("%sPacket/%dMB", mode, size)
   990  			b.Run(name, func(b *testing.B) {
   991  				b.Run("TLSv12", func(b *testing.B) {
   992  					throughput(b, VersionTLS12, int64(size<<20), mode == "Max")
   993  				})
   994  				b.Run("TLSv13", func(b *testing.B) {
   995  					throughput(b, VersionTLS13, int64(size<<20), mode == "Max")
   996  				})
   997  			})
   998  		}
   999  	}
  1000  }
  1001  
  1002  type slowConn struct {
  1003  	net.Conn
  1004  	bps int
  1005  }
  1006  
  1007  func (c *slowConn) Write(p []byte) (int, error) {
  1008  	if c.bps == 0 {
  1009  		panic("too slow")
  1010  	}
  1011  	t0 := time.Now()
  1012  	wrote := 0
  1013  	for wrote < len(p) {
  1014  		time.Sleep(100 * time.Microsecond)
  1015  		allowed := int(time.Since(t0).Seconds()*float64(c.bps)) / 8
  1016  		if allowed > len(p) {
  1017  			allowed = len(p)
  1018  		}
  1019  		if wrote < allowed {
  1020  			n, err := c.Conn.Write(p[wrote:allowed])
  1021  			wrote += n
  1022  			if err != nil {
  1023  				return wrote, err
  1024  			}
  1025  		}
  1026  	}
  1027  	return len(p), nil
  1028  }
  1029  
  1030  func latency(b *testing.B, version uint16, bps int, dynamicRecordSizingDisabled bool) {
  1031  	ln := newLocalListener(b)
  1032  	defer ln.Close()
  1033  
  1034  	N := b.N
  1035  
  1036  	go func() {
  1037  		for i := 0; i < N; i++ {
  1038  			sconn, err := ln.Accept()
  1039  			if err != nil {
  1040  				// panic rather than synchronize to avoid benchmark overhead
  1041  				// (cannot call b.Fatal in goroutine)
  1042  				panic(fmt.Errorf("accept: %v", err))
  1043  			}
  1044  			serverConfig := testConfig.Clone()
  1045  			serverConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
  1046  			srv := Server(&slowConn{sconn, bps}, serverConfig)
  1047  			if err := srv.Handshake(); err != nil {
  1048  				panic(fmt.Errorf("handshake: %v", err))
  1049  			}
  1050  			io.Copy(srv, srv)
  1051  		}
  1052  	}()
  1053  
  1054  	clientConfig := testConfig.Clone()
  1055  	clientConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
  1056  	clientConfig.MaxVersion = version
  1057  
  1058  	buf := make([]byte, 16384)
  1059  	peek := make([]byte, 1)
  1060  
  1061  	for i := 0; i < N; i++ {
  1062  		conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
  1063  		if err != nil {
  1064  			b.Fatal(err)
  1065  		}
  1066  		// make sure we're connected and previous connection has stopped
  1067  		if _, err := conn.Write(buf[:1]); err != nil {
  1068  			b.Fatal(err)
  1069  		}
  1070  		if _, err := io.ReadFull(conn, peek); err != nil {
  1071  			b.Fatal(err)
  1072  		}
  1073  		if _, err := conn.Write(buf); err != nil {
  1074  			b.Fatal(err)
  1075  		}
  1076  		if _, err = io.ReadFull(conn, peek); err != nil {
  1077  			b.Fatal(err)
  1078  		}
  1079  		conn.Close()
  1080  	}
  1081  }
  1082  
  1083  func BenchmarkLatency(b *testing.B) {
  1084  	for _, mode := range []string{"Max", "Dynamic"} {
  1085  		for _, kbps := range []int{200, 500, 1000, 2000, 5000} {
  1086  			name := fmt.Sprintf("%sPacket/%dkbps", mode, kbps)
  1087  			b.Run(name, func(b *testing.B) {
  1088  				b.Run("TLSv12", func(b *testing.B) {
  1089  					latency(b, VersionTLS12, kbps*1000, mode == "Max")
  1090  				})
  1091  				b.Run("TLSv13", func(b *testing.B) {
  1092  					latency(b, VersionTLS13, kbps*1000, mode == "Max")
  1093  				})
  1094  			})
  1095  		}
  1096  	}
  1097  }
  1098  
  1099  func TestConnectionStateMarshal(t *testing.T) {
  1100  	cs := &ConnectionState{}
  1101  	_, err := json.Marshal(cs)
  1102  	if err != nil {
  1103  		t.Errorf("json.Marshal failed on ConnectionState: %v", err)
  1104  	}
  1105  }
  1106  
  1107  func TestConnectionState(t *testing.T) {
  1108  	issuer, err := x509.ParseCertificate(testRSACertificateIssuer)
  1109  	if err != nil {
  1110  		panic(err)
  1111  	}
  1112  	rootCAs := x509.NewCertPool()
  1113  	rootCAs.AddCert(issuer)
  1114  
  1115  	now := func() time.Time { return time.Unix(1476984729, 0) }
  1116  
  1117  	const alpnProtocol = "golang"
  1118  	const serverName = "example.golang"
  1119  	var scts = [][]byte{[]byte("dummy sct 1"), []byte("dummy sct 2")}
  1120  	var ocsp = []byte("dummy ocsp")
  1121  
  1122  	for _, v := range []uint16{VersionTLS12, VersionTLS13} {
  1123  		var name string
  1124  		switch v {
  1125  		case VersionTLS12:
  1126  			name = "TLSv12"
  1127  		case VersionTLS13:
  1128  			name = "TLSv13"
  1129  		}
  1130  		t.Run(name, func(t *testing.T) {
  1131  			config := &Config{
  1132  				Time:         now,
  1133  				Rand:         zeroSource{},
  1134  				Certificates: make([]Certificate, 1),
  1135  				MaxVersion:   v,
  1136  				RootCAs:      rootCAs,
  1137  				ClientCAs:    rootCAs,
  1138  				ClientAuth:   RequireAndVerifyClientCert,
  1139  				NextProtos:   []string{alpnProtocol},
  1140  				ServerName:   serverName,
  1141  			}
  1142  			config.Certificates[0].Certificate = [][]byte{testRSACertificate}
  1143  			config.Certificates[0].PrivateKey = testRSAPrivateKey
  1144  			config.Certificates[0].SignedCertificateTimestamps = scts
  1145  			config.Certificates[0].OCSPStaple = ocsp
  1146  
  1147  			ss, cs, err := testHandshake(t, config, config)
  1148  			if err != nil {
  1149  				t.Fatalf("Handshake failed: %v", err)
  1150  			}
  1151  
  1152  			if ss.Version != v || cs.Version != v {
  1153  				t.Errorf("Got versions %x (server) and %x (client), expected %x", ss.Version, cs.Version, v)
  1154  			}
  1155  
  1156  			if !ss.HandshakeComplete || !cs.HandshakeComplete {
  1157  				t.Errorf("Got HandshakeComplete %v (server) and %v (client), expected true", ss.HandshakeComplete, cs.HandshakeComplete)
  1158  			}
  1159  
  1160  			if ss.DidResume || cs.DidResume {
  1161  				t.Errorf("Got DidResume %v (server) and %v (client), expected false", ss.DidResume, cs.DidResume)
  1162  			}
  1163  
  1164  			if ss.CipherSuite == 0 || cs.CipherSuite == 0 {
  1165  				t.Errorf("Got invalid cipher suite: %v (server) and %v (client)", ss.CipherSuite, cs.CipherSuite)
  1166  			}
  1167  
  1168  			if ss.NegotiatedProtocol != alpnProtocol || cs.NegotiatedProtocol != alpnProtocol {
  1169  				t.Errorf("Got negotiated protocol %q (server) and %q (client), expected %q", ss.NegotiatedProtocol, cs.NegotiatedProtocol, alpnProtocol)
  1170  			}
  1171  
  1172  			if !cs.NegotiatedProtocolIsMutual {
  1173  				t.Errorf("Got false NegotiatedProtocolIsMutual on the client side")
  1174  			}
  1175  			// NegotiatedProtocolIsMutual on the server side is unspecified.
  1176  
  1177  			if ss.ServerName != serverName {
  1178  				t.Errorf("Got server name %q, expected %q", ss.ServerName, serverName)
  1179  			}
  1180  			if cs.ServerName != serverName {
  1181  				t.Errorf("Got server name on client connection %q, expected %q", cs.ServerName, serverName)
  1182  			}
  1183  
  1184  			if len(ss.PeerCertificates) != 1 || len(cs.PeerCertificates) != 1 {
  1185  				t.Errorf("Got %d (server) and %d (client) peer certificates, expected %d", len(ss.PeerCertificates), len(cs.PeerCertificates), 1)
  1186  			}
  1187  
  1188  			if len(ss.VerifiedChains) != 1 || len(cs.VerifiedChains) != 1 {
  1189  				t.Errorf("Got %d (server) and %d (client) verified chains, expected %d", len(ss.VerifiedChains), len(cs.VerifiedChains), 1)
  1190  			} else if len(ss.VerifiedChains[0]) != 2 || len(cs.VerifiedChains[0]) != 2 {
  1191  				t.Errorf("Got %d (server) and %d (client) long verified chain, expected %d", len(ss.VerifiedChains[0]), len(cs.VerifiedChains[0]), 2)
  1192  			}
  1193  
  1194  			if len(cs.SignedCertificateTimestamps) != 2 {
  1195  				t.Errorf("Got %d SCTs, expected %d", len(cs.SignedCertificateTimestamps), 2)
  1196  			}
  1197  			if !bytes.Equal(cs.OCSPResponse, ocsp) {
  1198  				t.Errorf("Got OCSPs %x, expected %x", cs.OCSPResponse, ocsp)
  1199  			}
  1200  			// Only TLS 1.3 supports OCSP and SCTs on client certs.
  1201  			if v == VersionTLS13 {
  1202  				if len(ss.SignedCertificateTimestamps) != 2 {
  1203  					t.Errorf("Got %d client SCTs, expected %d", len(ss.SignedCertificateTimestamps), 2)
  1204  				}
  1205  				if !bytes.Equal(ss.OCSPResponse, ocsp) {
  1206  					t.Errorf("Got client OCSPs %x, expected %x", ss.OCSPResponse, ocsp)
  1207  				}
  1208  			}
  1209  
  1210  			if v == VersionTLS13 {
  1211  				if ss.TLSUnique != nil || cs.TLSUnique != nil {
  1212  					t.Errorf("Got TLSUnique %x (server) and %x (client), expected nil in TLS 1.3", ss.TLSUnique, cs.TLSUnique)
  1213  				}
  1214  			} else {
  1215  				if ss.TLSUnique == nil || cs.TLSUnique == nil {
  1216  					t.Errorf("Got TLSUnique %x (server) and %x (client), expected non-nil", ss.TLSUnique, cs.TLSUnique)
  1217  				}
  1218  			}
  1219  		})
  1220  	}
  1221  }
  1222  
  1223  // Issue 28744: Ensure that we don't modify memory
  1224  // that Config doesn't own such as Certificates.
  1225  func TestBuildNameToCertificate_doesntModifyCertificates(t *testing.T) {
  1226  	c0 := Certificate{
  1227  		Certificate: [][]byte{testRSACertificate},
  1228  		PrivateKey:  testRSAPrivateKey,
  1229  	}
  1230  	c1 := Certificate{
  1231  		Certificate: [][]byte{testSNICertificate},
  1232  		PrivateKey:  testRSAPrivateKey,
  1233  	}
  1234  	config := testConfig.Clone()
  1235  	config.Certificates = []Certificate{c0, c1}
  1236  
  1237  	config.BuildNameToCertificate()
  1238  	got := config.Certificates
  1239  	want := []Certificate{c0, c1}
  1240  	if !reflect.DeepEqual(got, want) {
  1241  		t.Fatalf("Certificates were mutated by BuildNameToCertificate\nGot: %#v\nWant: %#v\n", got, want)
  1242  	}
  1243  }
  1244  
  1245  func testingKey(s string) string { return strings.ReplaceAll(s, "TESTING KEY", "PRIVATE KEY") }
  1246  
  1247  func TestClientHelloInfo_SupportsCertificate(t *testing.T) {
  1248  	rsaCert := &Certificate{
  1249  		Certificate: [][]byte{testRSACertificate},
  1250  		PrivateKey:  testRSAPrivateKey,
  1251  	}
  1252  	pkcs1Cert := &Certificate{
  1253  		Certificate:                  [][]byte{testRSACertificate},
  1254  		PrivateKey:                   testRSAPrivateKey,
  1255  		SupportedSignatureAlgorithms: []SignatureScheme{PKCS1WithSHA1, PKCS1WithSHA256},
  1256  	}
  1257  	ecdsaCert := &Certificate{
  1258  		// ECDSA P-256 certificate
  1259  		Certificate: [][]byte{testP256Certificate},
  1260  		PrivateKey:  testP256PrivateKey,
  1261  	}
  1262  	ed25519Cert := &Certificate{
  1263  		Certificate: [][]byte{testEd25519Certificate},
  1264  		PrivateKey:  testEd25519PrivateKey,
  1265  	}
  1266  
  1267  	tests := []struct {
  1268  		c       *Certificate
  1269  		chi     *ClientHelloInfo
  1270  		wantErr string
  1271  	}{
  1272  		{rsaCert, &ClientHelloInfo{
  1273  			ServerName:        "example.golang",
  1274  			SignatureSchemes:  []SignatureScheme{PSSWithSHA256},
  1275  			SupportedVersions: []uint16{VersionTLS13},
  1276  		}, ""},
  1277  		{ecdsaCert, &ClientHelloInfo{
  1278  			SignatureSchemes:  []SignatureScheme{PSSWithSHA256, ECDSAWithP256AndSHA256},
  1279  			SupportedVersions: []uint16{VersionTLS13, VersionTLS12},
  1280  		}, ""},
  1281  		{rsaCert, &ClientHelloInfo{
  1282  			ServerName:        "example.com",
  1283  			SignatureSchemes:  []SignatureScheme{PSSWithSHA256},
  1284  			SupportedVersions: []uint16{VersionTLS13},
  1285  		}, "not valid for requested server name"},
  1286  		{ecdsaCert, &ClientHelloInfo{
  1287  			SignatureSchemes:  []SignatureScheme{ECDSAWithP384AndSHA384},
  1288  			SupportedVersions: []uint16{VersionTLS13},
  1289  		}, "signature algorithms"},
  1290  		{pkcs1Cert, &ClientHelloInfo{
  1291  			SignatureSchemes:  []SignatureScheme{PSSWithSHA256, ECDSAWithP256AndSHA256},
  1292  			SupportedVersions: []uint16{VersionTLS13},
  1293  		}, "signature algorithms"},
  1294  
  1295  		{rsaCert, &ClientHelloInfo{
  1296  			CipherSuites:      []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
  1297  			SignatureSchemes:  []SignatureScheme{PKCS1WithSHA1},
  1298  			SupportedVersions: []uint16{VersionTLS13, VersionTLS12},
  1299  		}, "signature algorithms"},
  1300  		{rsaCert, &ClientHelloInfo{
  1301  			CipherSuites:      []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
  1302  			SignatureSchemes:  []SignatureScheme{PKCS1WithSHA1},
  1303  			SupportedVersions: []uint16{VersionTLS13, VersionTLS12},
  1304  			config: &Config{
  1305  				CipherSuites: []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
  1306  				MaxVersion:   VersionTLS12,
  1307  			},
  1308  		}, ""}, // Check that mutual version selection works.
  1309  
  1310  		{ecdsaCert, &ClientHelloInfo{
  1311  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1312  			SupportedCurves:   []CurveID{CurveP256},
  1313  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1314  			SignatureSchemes:  []SignatureScheme{ECDSAWithP256AndSHA256},
  1315  			SupportedVersions: []uint16{VersionTLS12},
  1316  		}, ""},
  1317  		{ecdsaCert, &ClientHelloInfo{
  1318  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1319  			SupportedCurves:   []CurveID{CurveP256},
  1320  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1321  			SignatureSchemes:  []SignatureScheme{ECDSAWithP384AndSHA384},
  1322  			SupportedVersions: []uint16{VersionTLS12},
  1323  		}, ""}, // TLS 1.2 does not restrict curves based on the SignatureScheme.
  1324  		{ecdsaCert, &ClientHelloInfo{
  1325  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1326  			SupportedCurves:   []CurveID{CurveP256},
  1327  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1328  			SignatureSchemes:  nil,
  1329  			SupportedVersions: []uint16{VersionTLS12},
  1330  		}, ""}, // TLS 1.2 comes with default signature schemes.
  1331  		{ecdsaCert, &ClientHelloInfo{
  1332  			CipherSuites:      []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
  1333  			SupportedCurves:   []CurveID{CurveP256},
  1334  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1335  			SignatureSchemes:  []SignatureScheme{ECDSAWithP256AndSHA256},
  1336  			SupportedVersions: []uint16{VersionTLS12},
  1337  		}, "cipher suite"},
  1338  		{ecdsaCert, &ClientHelloInfo{
  1339  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1340  			SupportedCurves:   []CurveID{CurveP256},
  1341  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1342  			SignatureSchemes:  []SignatureScheme{ECDSAWithP256AndSHA256},
  1343  			SupportedVersions: []uint16{VersionTLS12},
  1344  			config: &Config{
  1345  				CipherSuites: []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
  1346  			},
  1347  		}, "cipher suite"},
  1348  		{ecdsaCert, &ClientHelloInfo{
  1349  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1350  			SupportedCurves:   []CurveID{CurveP384},
  1351  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1352  			SignatureSchemes:  []SignatureScheme{ECDSAWithP256AndSHA256},
  1353  			SupportedVersions: []uint16{VersionTLS12},
  1354  		}, "certificate curve"},
  1355  		{ecdsaCert, &ClientHelloInfo{
  1356  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1357  			SupportedCurves:   []CurveID{CurveP256},
  1358  			SupportedPoints:   []uint8{1},
  1359  			SignatureSchemes:  []SignatureScheme{ECDSAWithP256AndSHA256},
  1360  			SupportedVersions: []uint16{VersionTLS12},
  1361  		}, "doesn't support ECDHE"},
  1362  		{ecdsaCert, &ClientHelloInfo{
  1363  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1364  			SupportedCurves:   []CurveID{CurveP256},
  1365  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1366  			SignatureSchemes:  []SignatureScheme{PSSWithSHA256},
  1367  			SupportedVersions: []uint16{VersionTLS12},
  1368  		}, "signature algorithms"},
  1369  
  1370  		{ed25519Cert, &ClientHelloInfo{
  1371  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1372  			SupportedCurves:   []CurveID{CurveP256}, // only relevant for ECDHE support
  1373  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1374  			SignatureSchemes:  []SignatureScheme{Ed25519},
  1375  			SupportedVersions: []uint16{VersionTLS12},
  1376  		}, ""},
  1377  		{ed25519Cert, &ClientHelloInfo{
  1378  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1379  			SupportedCurves:   []CurveID{CurveP256}, // only relevant for ECDHE support
  1380  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1381  			SignatureSchemes:  []SignatureScheme{Ed25519},
  1382  			SupportedVersions: []uint16{VersionTLS10},
  1383  			config:            &Config{MinVersion: VersionTLS10},
  1384  		}, "doesn't support Ed25519"},
  1385  		{ed25519Cert, &ClientHelloInfo{
  1386  			CipherSuites:      []uint16{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
  1387  			SupportedCurves:   []CurveID{},
  1388  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1389  			SignatureSchemes:  []SignatureScheme{Ed25519},
  1390  			SupportedVersions: []uint16{VersionTLS12},
  1391  		}, "doesn't support ECDHE"},
  1392  
  1393  		{rsaCert, &ClientHelloInfo{
  1394  			CipherSuites:      []uint16{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA},
  1395  			SupportedCurves:   []CurveID{CurveP256}, // only relevant for ECDHE support
  1396  			SupportedPoints:   []uint8{pointFormatUncompressed},
  1397  			SupportedVersions: []uint16{VersionTLS10},
  1398  			config:            &Config{MinVersion: VersionTLS10},
  1399  		}, ""},
  1400  		{rsaCert, &ClientHelloInfo{
  1401  			CipherSuites:      []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
  1402  			SupportedVersions: []uint16{VersionTLS12},
  1403  			config: &Config{
  1404  				CipherSuites: []uint16{TLS_RSA_WITH_AES_128_GCM_SHA256},
  1405  			},
  1406  		}, ""}, // static RSA fallback
  1407  	}
  1408  	for i, tt := range tests {
  1409  		err := tt.chi.SupportsCertificate(tt.c)
  1410  		switch {
  1411  		case tt.wantErr == "" && err != nil:
  1412  			t.Errorf("%d: unexpected error: %v", i, err)
  1413  		case tt.wantErr != "" && err == nil:
  1414  			t.Errorf("%d: unexpected success", i)
  1415  		case tt.wantErr != "" && !strings.Contains(err.Error(), tt.wantErr):
  1416  			t.Errorf("%d: got error %q, expected %q", i, err, tt.wantErr)
  1417  		}
  1418  	}
  1419  }
  1420  
  1421  func TestCipherSuites(t *testing.T) {
  1422  	var lastID uint16
  1423  	for _, c := range CipherSuites() {
  1424  		if lastID > c.ID {
  1425  			t.Errorf("CipherSuites are not ordered by ID: got %#04x after %#04x", c.ID, lastID)
  1426  		} else {
  1427  			lastID = c.ID
  1428  		}
  1429  
  1430  		if c.Insecure {
  1431  			t.Errorf("%#04x: Insecure CipherSuite returned by CipherSuites()", c.ID)
  1432  		}
  1433  	}
  1434  	lastID = 0
  1435  	for _, c := range InsecureCipherSuites() {
  1436  		if lastID > c.ID {
  1437  			t.Errorf("InsecureCipherSuites are not ordered by ID: got %#04x after %#04x", c.ID, lastID)
  1438  		} else {
  1439  			lastID = c.ID
  1440  		}
  1441  
  1442  		if !c.Insecure {
  1443  			t.Errorf("%#04x: not Insecure CipherSuite returned by InsecureCipherSuites()", c.ID)
  1444  		}
  1445  	}
  1446  
  1447  	CipherSuiteByID := func(id uint16) *CipherSuite {
  1448  		for _, c := range CipherSuites() {
  1449  			if c.ID == id {
  1450  				return c
  1451  			}
  1452  		}
  1453  		for _, c := range InsecureCipherSuites() {
  1454  			if c.ID == id {
  1455  				return c
  1456  			}
  1457  		}
  1458  		return nil
  1459  	}
  1460  
  1461  	for _, c := range cipherSuites {
  1462  		cc := CipherSuiteByID(c.id)
  1463  		if cc == nil {
  1464  			t.Errorf("%#04x: no CipherSuite entry", c.id)
  1465  			continue
  1466  		}
  1467  
  1468  		if tls12Only := c.flags&suiteTLS12 != 0; tls12Only && len(cc.SupportedVersions) != 1 {
  1469  			t.Errorf("%#04x: suite is TLS 1.2 only, but SupportedVersions is %v", c.id, cc.SupportedVersions)
  1470  		} else if !tls12Only && len(cc.SupportedVersions) != 3 {
  1471  			t.Errorf("%#04x: suite TLS 1.0-1.2, but SupportedVersions is %v", c.id, cc.SupportedVersions)
  1472  		}
  1473  
  1474  		if cc.Insecure {
  1475  			if slices.Contains(defaultCipherSuites(), c.id) {
  1476  				t.Errorf("%#04x: insecure suite in default list", c.id)
  1477  			}
  1478  		} else {
  1479  			if !slices.Contains(defaultCipherSuites(), c.id) {
  1480  				t.Errorf("%#04x: secure suite not in default list", c.id)
  1481  			}
  1482  		}
  1483  
  1484  		if got := CipherSuiteName(c.id); got != cc.Name {
  1485  			t.Errorf("%#04x: unexpected CipherSuiteName: got %q, expected %q", c.id, got, cc.Name)
  1486  		}
  1487  	}
  1488  	for _, c := range cipherSuitesTLS13 {
  1489  		cc := CipherSuiteByID(c.id)
  1490  		if cc == nil {
  1491  			t.Errorf("%#04x: no CipherSuite entry", c.id)
  1492  			continue
  1493  		}
  1494  
  1495  		if cc.Insecure {
  1496  			t.Errorf("%#04x: Insecure %v, expected false", c.id, cc.Insecure)
  1497  		}
  1498  		if len(cc.SupportedVersions) != 1 || cc.SupportedVersions[0] != VersionTLS13 {
  1499  			t.Errorf("%#04x: suite is TLS 1.3 only, but SupportedVersions is %v", c.id, cc.SupportedVersions)
  1500  		}
  1501  
  1502  		if got := CipherSuiteName(c.id); got != cc.Name {
  1503  			t.Errorf("%#04x: unexpected CipherSuiteName: got %q, expected %q", c.id, got, cc.Name)
  1504  		}
  1505  	}
  1506  
  1507  	if got := CipherSuiteName(0xabc); got != "0x0ABC" {
  1508  		t.Errorf("unexpected fallback CipherSuiteName: got %q, expected 0x0ABC", got)
  1509  	}
  1510  
  1511  	if len(cipherSuitesPreferenceOrder) != len(cipherSuites) {
  1512  		t.Errorf("cipherSuitesPreferenceOrder is not the same size as cipherSuites")
  1513  	}
  1514  	if len(cipherSuitesPreferenceOrderNoAES) != len(cipherSuitesPreferenceOrder) {
  1515  		t.Errorf("cipherSuitesPreferenceOrderNoAES is not the same size as cipherSuitesPreferenceOrder")
  1516  	}
  1517  
  1518  	// Check that disabled suites are marked insecure.
  1519  	for _, badSuites := range []map[uint16]bool{disabledCipherSuites, rsaKexCiphers} {
  1520  		for id := range badSuites {
  1521  			c := CipherSuiteByID(id)
  1522  			if c == nil {
  1523  				t.Errorf("%#04x: no CipherSuite entry", id)
  1524  				continue
  1525  			}
  1526  			if !c.Insecure {
  1527  				t.Errorf("%#04x: disabled by default but not marked insecure", id)
  1528  			}
  1529  		}
  1530  	}
  1531  
  1532  	for i, prefOrder := range [][]uint16{cipherSuitesPreferenceOrder, cipherSuitesPreferenceOrderNoAES} {
  1533  		// Check that insecure and HTTP/2 bad cipher suites are at the end of
  1534  		// the preference lists.
  1535  		var sawInsecure, sawBad bool
  1536  		for _, id := range prefOrder {
  1537  			c := CipherSuiteByID(id)
  1538  			if c == nil {
  1539  				t.Errorf("%#04x: no CipherSuite entry", id)
  1540  				continue
  1541  			}
  1542  
  1543  			if c.Insecure {
  1544  				sawInsecure = true
  1545  			} else if sawInsecure {
  1546  				t.Errorf("%#04x: secure suite after insecure one(s)", id)
  1547  			}
  1548  
  1549  			if http2isBadCipher(id) {
  1550  				sawBad = true
  1551  			} else if sawBad {
  1552  				t.Errorf("%#04x: non-bad suite after bad HTTP/2 one(s)", id)
  1553  			}
  1554  		}
  1555  
  1556  		// Check that the list is sorted according to the documented criteria.
  1557  		isBetter := func(a, b uint16) int {
  1558  			aSuite, bSuite := cipherSuiteByID(a), cipherSuiteByID(b)
  1559  			aName, bName := CipherSuiteName(a), CipherSuiteName(b)
  1560  			// * < RC4
  1561  			if !strings.Contains(aName, "RC4") && strings.Contains(bName, "RC4") {
  1562  				return -1
  1563  			} else if strings.Contains(aName, "RC4") && !strings.Contains(bName, "RC4") {
  1564  				return +1
  1565  			}
  1566  			// * < CBC_SHA256
  1567  			if !strings.Contains(aName, "CBC_SHA256") && strings.Contains(bName, "CBC_SHA256") {
  1568  				return -1
  1569  			} else if strings.Contains(aName, "CBC_SHA256") && !strings.Contains(bName, "CBC_SHA256") {
  1570  				return +1
  1571  			}
  1572  			// * < 3DES
  1573  			if !strings.Contains(aName, "3DES") && strings.Contains(bName, "3DES") {
  1574  				return -1
  1575  			} else if strings.Contains(aName, "3DES") && !strings.Contains(bName, "3DES") {
  1576  				return +1
  1577  			}
  1578  			// ECDHE < *
  1579  			if aSuite.flags&suiteECDHE != 0 && bSuite.flags&suiteECDHE == 0 {
  1580  				return -1
  1581  			} else if aSuite.flags&suiteECDHE == 0 && bSuite.flags&suiteECDHE != 0 {
  1582  				return +1
  1583  			}
  1584  			// AEAD < CBC
  1585  			if aSuite.aead != nil && bSuite.aead == nil {
  1586  				return -1
  1587  			} else if aSuite.aead == nil && bSuite.aead != nil {
  1588  				return +1
  1589  			}
  1590  			// AES < ChaCha20
  1591  			if strings.Contains(aName, "AES") && strings.Contains(bName, "CHACHA20") {
  1592  				// negative for cipherSuitesPreferenceOrder
  1593  				if i == 0 {
  1594  					return -1
  1595  				} else {
  1596  					return +1
  1597  				}
  1598  			} else if strings.Contains(aName, "CHACHA20") && strings.Contains(bName, "AES") {
  1599  				// negative for cipherSuitesPreferenceOrderNoAES
  1600  				if i != 0 {
  1601  					return -1
  1602  				} else {
  1603  					return +1
  1604  				}
  1605  			}
  1606  			// AES-128 < AES-256
  1607  			if strings.Contains(aName, "AES_128") && strings.Contains(bName, "AES_256") {
  1608  				return -1
  1609  			} else if strings.Contains(aName, "AES_256") && strings.Contains(bName, "AES_128") {
  1610  				return +1
  1611  			}
  1612  			// ECDSA < RSA
  1613  			if aSuite.flags&suiteECSign != 0 && bSuite.flags&suiteECSign == 0 {
  1614  				return -1
  1615  			} else if aSuite.flags&suiteECSign == 0 && bSuite.flags&suiteECSign != 0 {
  1616  				return +1
  1617  			}
  1618  			t.Fatalf("two ciphersuites are equal by all criteria: %v and %v", aName, bName)
  1619  			panic("unreachable")
  1620  		}
  1621  		if !slices.IsSortedFunc(prefOrder, isBetter) {
  1622  			t.Error("preference order is not sorted according to the rules")
  1623  		}
  1624  	}
  1625  }
  1626  
  1627  func TestVersionName(t *testing.T) {
  1628  	if got, exp := VersionName(VersionTLS13), "TLS 1.3"; got != exp {
  1629  		t.Errorf("unexpected VersionName: got %q, expected %q", got, exp)
  1630  	}
  1631  	if got, exp := VersionName(0x12a), "0x012A"; got != exp {
  1632  		t.Errorf("unexpected fallback VersionName: got %q, expected %q", got, exp)
  1633  	}
  1634  }
  1635  
  1636  // http2isBadCipher is copied from net/http.
  1637  // TODO: if it ends up exposed somewhere, use that instead.
  1638  func http2isBadCipher(cipher uint16) bool {
  1639  	switch cipher {
  1640  	case TLS_RSA_WITH_RC4_128_SHA,
  1641  		TLS_RSA_WITH_3DES_EDE_CBC_SHA,
  1642  		TLS_RSA_WITH_AES_128_CBC_SHA,
  1643  		TLS_RSA_WITH_AES_256_CBC_SHA,
  1644  		TLS_RSA_WITH_AES_128_CBC_SHA256,
  1645  		TLS_RSA_WITH_AES_128_GCM_SHA256,
  1646  		TLS_RSA_WITH_AES_256_GCM_SHA384,
  1647  		TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
  1648  		TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
  1649  		TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
  1650  		TLS_ECDHE_RSA_WITH_RC4_128_SHA,
  1651  		TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
  1652  		TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
  1653  		TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
  1654  		TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
  1655  		TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256:
  1656  		return true
  1657  	default:
  1658  		return false
  1659  	}
  1660  }
  1661  
  1662  type brokenSigner struct{ crypto.Signer }
  1663  
  1664  func (s brokenSigner) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (signature []byte, err error) {
  1665  	// Replace opts with opts.HashFunc(), so rsa.PSSOptions are discarded.
  1666  	return s.Signer.Sign(rand, digest, opts.HashFunc())
  1667  }
  1668  
  1669  // TestPKCS1OnlyCert uses a client certificate with a broken crypto.Signer that
  1670  // always makes PKCS #1 v1.5 signatures, so can't be used with RSA-PSS.
  1671  func TestPKCS1OnlyCert(t *testing.T) {
  1672  	clientConfig := testConfig.Clone()
  1673  	clientConfig.Certificates = []Certificate{{
  1674  		Certificate: [][]byte{testRSACertificate},
  1675  		PrivateKey:  brokenSigner{testRSAPrivateKey},
  1676  	}}
  1677  	serverConfig := testConfig.Clone()
  1678  	serverConfig.MaxVersion = VersionTLS12 // TLS 1.3 doesn't support PKCS #1 v1.5
  1679  	serverConfig.ClientAuth = RequireAnyClientCert
  1680  
  1681  	// If RSA-PSS is selected, the handshake should fail.
  1682  	if _, _, err := testHandshake(t, clientConfig, serverConfig); err == nil {
  1683  		t.Fatal("expected broken certificate to cause connection to fail")
  1684  	}
  1685  
  1686  	clientConfig.Certificates[0].SupportedSignatureAlgorithms =
  1687  		[]SignatureScheme{PKCS1WithSHA1, PKCS1WithSHA256}
  1688  
  1689  	// But if the certificate restricts supported algorithms, RSA-PSS should not
  1690  	// be selected, and the handshake should succeed.
  1691  	if _, _, err := testHandshake(t, clientConfig, serverConfig); err != nil {
  1692  		t.Error(err)
  1693  	}
  1694  }
  1695  
  1696  func TestVerifyCertificates(t *testing.T) {
  1697  	// See https://go.dev/issue/31641.
  1698  	t.Run("TLSv12", func(t *testing.T) { testVerifyCertificates(t, VersionTLS12) })
  1699  	t.Run("TLSv13", func(t *testing.T) { testVerifyCertificates(t, VersionTLS13) })
  1700  }
  1701  
  1702  func testVerifyCertificates(t *testing.T, version uint16) {
  1703  	tests := []struct {
  1704  		name string
  1705  
  1706  		InsecureSkipVerify bool
  1707  		ClientAuth         ClientAuthType
  1708  		ClientCertificates bool
  1709  	}{
  1710  		{
  1711  			name: "defaults",
  1712  		},
  1713  		{
  1714  			name:               "InsecureSkipVerify",
  1715  			InsecureSkipVerify: true,
  1716  		},
  1717  		{
  1718  			name:       "RequestClientCert with no certs",
  1719  			ClientAuth: RequestClientCert,
  1720  		},
  1721  		{
  1722  			name:               "RequestClientCert with certs",
  1723  			ClientAuth:         RequestClientCert,
  1724  			ClientCertificates: true,
  1725  		},
  1726  		{
  1727  			name:               "RequireAnyClientCert",
  1728  			ClientAuth:         RequireAnyClientCert,
  1729  			ClientCertificates: true,
  1730  		},
  1731  		{
  1732  			name:       "VerifyClientCertIfGiven with no certs",
  1733  			ClientAuth: VerifyClientCertIfGiven,
  1734  		},
  1735  		{
  1736  			name:               "VerifyClientCertIfGiven with certs",
  1737  			ClientAuth:         VerifyClientCertIfGiven,
  1738  			ClientCertificates: true,
  1739  		},
  1740  		{
  1741  			name:               "RequireAndVerifyClientCert",
  1742  			ClientAuth:         RequireAndVerifyClientCert,
  1743  			ClientCertificates: true,
  1744  		},
  1745  	}
  1746  
  1747  	issuer, err := x509.ParseCertificate(testRSACertificateIssuer)
  1748  	if err != nil {
  1749  		t.Fatal(err)
  1750  	}
  1751  	rootCAs := x509.NewCertPool()
  1752  	rootCAs.AddCert(issuer)
  1753  
  1754  	for _, test := range tests {
  1755  		test := test
  1756  		t.Run(test.name, func(t *testing.T) {
  1757  			t.Parallel()
  1758  
  1759  			var serverVerifyConnection, clientVerifyConnection bool
  1760  			var serverVerifyPeerCertificates, clientVerifyPeerCertificates bool
  1761  
  1762  			clientConfig := testConfig.Clone()
  1763  			clientConfig.Time = func() time.Time { return time.Unix(1476984729, 0) }
  1764  			clientConfig.MaxVersion = version
  1765  			clientConfig.MinVersion = version
  1766  			clientConfig.RootCAs = rootCAs
  1767  			clientConfig.ServerName = "example.golang"
  1768  			clientConfig.ClientSessionCache = NewLRUClientSessionCache(1)
  1769  			serverConfig := clientConfig.Clone()
  1770  			serverConfig.ClientCAs = rootCAs
  1771  
  1772  			clientConfig.VerifyConnection = func(cs ConnectionState) error {
  1773  				clientVerifyConnection = true
  1774  				return nil
  1775  			}
  1776  			clientConfig.VerifyPeerCertificate = func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
  1777  				clientVerifyPeerCertificates = true
  1778  				return nil
  1779  			}
  1780  			serverConfig.VerifyConnection = func(cs ConnectionState) error {
  1781  				serverVerifyConnection = true
  1782  				return nil
  1783  			}
  1784  			serverConfig.VerifyPeerCertificate = func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
  1785  				serverVerifyPeerCertificates = true
  1786  				return nil
  1787  			}
  1788  
  1789  			clientConfig.InsecureSkipVerify = test.InsecureSkipVerify
  1790  			serverConfig.ClientAuth = test.ClientAuth
  1791  			if !test.ClientCertificates {
  1792  				clientConfig.Certificates = nil
  1793  			}
  1794  
  1795  			if _, _, err := testHandshake(t, clientConfig, serverConfig); err != nil {
  1796  				t.Fatal(err)
  1797  			}
  1798  
  1799  			want := serverConfig.ClientAuth != NoClientCert
  1800  			if serverVerifyPeerCertificates != want {
  1801  				t.Errorf("VerifyPeerCertificates on the server: got %v, want %v",
  1802  					serverVerifyPeerCertificates, want)
  1803  			}
  1804  			if !clientVerifyPeerCertificates {
  1805  				t.Errorf("VerifyPeerCertificates not called on the client")
  1806  			}
  1807  			if !serverVerifyConnection {
  1808  				t.Error("VerifyConnection did not get called on the server")
  1809  			}
  1810  			if !clientVerifyConnection {
  1811  				t.Error("VerifyConnection did not get called on the client")
  1812  			}
  1813  
  1814  			serverVerifyPeerCertificates, clientVerifyPeerCertificates = false, false
  1815  			serverVerifyConnection, clientVerifyConnection = false, false
  1816  			cs, _, err := testHandshake(t, clientConfig, serverConfig)
  1817  			if err != nil {
  1818  				t.Fatal(err)
  1819  			}
  1820  			if !cs.DidResume {
  1821  				t.Error("expected resumption")
  1822  			}
  1823  
  1824  			if serverVerifyPeerCertificates {
  1825  				t.Error("VerifyPeerCertificates got called on the server on resumption")
  1826  			}
  1827  			if clientVerifyPeerCertificates {
  1828  				t.Error("VerifyPeerCertificates got called on the client on resumption")
  1829  			}
  1830  			if !serverVerifyConnection {
  1831  				t.Error("VerifyConnection did not get called on the server on resumption")
  1832  			}
  1833  			if !clientVerifyConnection {
  1834  				t.Error("VerifyConnection did not get called on the client on resumption")
  1835  			}
  1836  		})
  1837  	}
  1838  }
  1839  
  1840  func TestHandshakeKyber(t *testing.T) {
  1841  	if x25519Kyber768Draft00.String() != "X25519Kyber768Draft00" {
  1842  		t.Fatalf("unexpected CurveID string: %v", x25519Kyber768Draft00.String())
  1843  	}
  1844  
  1845  	var tests = []struct {
  1846  		name                string
  1847  		clientConfig        func(*Config)
  1848  		serverConfig        func(*Config)
  1849  		preparation         func(*testing.T)
  1850  		expectClientSupport bool
  1851  		expectKyber         bool
  1852  		expectHRR           bool
  1853  	}{
  1854  		{
  1855  			name:                "Default",
  1856  			expectClientSupport: true,
  1857  			expectKyber:         true,
  1858  			expectHRR:           false,
  1859  		},
  1860  		{
  1861  			name: "ClientCurvePreferences",
  1862  			clientConfig: func(config *Config) {
  1863  				config.CurvePreferences = []CurveID{X25519}
  1864  			},
  1865  			expectClientSupport: false,
  1866  		},
  1867  		{
  1868  			name: "ServerCurvePreferencesX25519",
  1869  			serverConfig: func(config *Config) {
  1870  				config.CurvePreferences = []CurveID{X25519}
  1871  			},
  1872  			expectClientSupport: true,
  1873  			expectKyber:         false,
  1874  			expectHRR:           false,
  1875  		},
  1876  		{
  1877  			name: "ServerCurvePreferencesHRR",
  1878  			serverConfig: func(config *Config) {
  1879  				config.CurvePreferences = []CurveID{CurveP256}
  1880  			},
  1881  			expectClientSupport: true,
  1882  			expectKyber:         false,
  1883  			expectHRR:           true,
  1884  		},
  1885  		{
  1886  			name: "ClientTLSv12",
  1887  			clientConfig: func(config *Config) {
  1888  				config.MaxVersion = VersionTLS12
  1889  			},
  1890  			expectClientSupport: false,
  1891  		},
  1892  		{
  1893  			name: "ServerTLSv12",
  1894  			serverConfig: func(config *Config) {
  1895  				config.MaxVersion = VersionTLS12
  1896  			},
  1897  			expectClientSupport: true,
  1898  			expectKyber:         false,
  1899  		},
  1900  		{
  1901  			name: "GODEBUG",
  1902  			preparation: func(t *testing.T) {
  1903  				t.Setenv("GODEBUG", "tlskyber=0")
  1904  			},
  1905  			expectClientSupport: false,
  1906  		},
  1907  	}
  1908  
  1909  	baseConfig := testConfig.Clone()
  1910  	baseConfig.CurvePreferences = nil
  1911  	for _, test := range tests {
  1912  		t.Run(test.name, func(t *testing.T) {
  1913  			if test.preparation != nil {
  1914  				test.preparation(t)
  1915  			} else {
  1916  				t.Parallel()
  1917  			}
  1918  			serverConfig := baseConfig.Clone()
  1919  			if test.serverConfig != nil {
  1920  				test.serverConfig(serverConfig)
  1921  			}
  1922  			serverConfig.GetConfigForClient = func(hello *ClientHelloInfo) (*Config, error) {
  1923  				if !test.expectClientSupport && slices.Contains(hello.SupportedCurves, x25519Kyber768Draft00) {
  1924  					return nil, errors.New("client supports Kyber768Draft00")
  1925  				} else if test.expectClientSupport && !slices.Contains(hello.SupportedCurves, x25519Kyber768Draft00) {
  1926  					return nil, errors.New("client does not support Kyber768Draft00")
  1927  				}
  1928  				return nil, nil
  1929  			}
  1930  			clientConfig := baseConfig.Clone()
  1931  			if test.clientConfig != nil {
  1932  				test.clientConfig(clientConfig)
  1933  			}
  1934  			ss, cs, err := testHandshake(t, clientConfig, serverConfig)
  1935  			if err != nil {
  1936  				t.Fatal(err)
  1937  			}
  1938  			if test.expectKyber {
  1939  				if ss.testingOnlyCurveID != x25519Kyber768Draft00 {
  1940  					t.Errorf("got CurveID %v (server), expected %v", ss.testingOnlyCurveID, x25519Kyber768Draft00)
  1941  				}
  1942  				if cs.testingOnlyCurveID != x25519Kyber768Draft00 {
  1943  					t.Errorf("got CurveID %v (client), expected %v", cs.testingOnlyCurveID, x25519Kyber768Draft00)
  1944  				}
  1945  			} else {
  1946  				if ss.testingOnlyCurveID == x25519Kyber768Draft00 {
  1947  					t.Errorf("got CurveID %v (server), expected not Kyber", ss.testingOnlyCurveID)
  1948  				}
  1949  				if cs.testingOnlyCurveID == x25519Kyber768Draft00 {
  1950  					t.Errorf("got CurveID %v (client), expected not Kyber", cs.testingOnlyCurveID)
  1951  				}
  1952  			}
  1953  			if test.expectHRR {
  1954  				if !ss.testingOnlyDidHRR {
  1955  					t.Error("server did not use HRR")
  1956  				}
  1957  				if !cs.testingOnlyDidHRR {
  1958  					t.Error("client did not use HRR")
  1959  				}
  1960  			} else {
  1961  				if ss.testingOnlyDidHRR {
  1962  					t.Error("server used HRR")
  1963  				}
  1964  				if cs.testingOnlyDidHRR {
  1965  					t.Error("client used HRR")
  1966  				}
  1967  			}
  1968  		})
  1969  	}
  1970  }
  1971  
  1972  func TestX509KeyPairPopulateCertificate(t *testing.T) {
  1973  	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
  1974  	if err != nil {
  1975  		t.Fatal(err)
  1976  	}
  1977  	keyDER, err := x509.MarshalPKCS8PrivateKey(key)
  1978  	if err != nil {
  1979  		t.Fatal(err)
  1980  	}
  1981  	keyPEM := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: keyDER})
  1982  	tmpl := &x509.Certificate{
  1983  		SerialNumber: big.NewInt(1),
  1984  		Subject:      pkix.Name{CommonName: "test"},
  1985  	}
  1986  	certDER, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, key.Public(), key)
  1987  	if err != nil {
  1988  		t.Fatal(err)
  1989  	}
  1990  	certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
  1991  
  1992  	t.Run("x509keypairleaf=0", func(t *testing.T) {
  1993  		t.Setenv("GODEBUG", "x509keypairleaf=0")
  1994  		cert, err := X509KeyPair(certPEM, keyPEM)
  1995  		if err != nil {
  1996  			t.Fatal(err)
  1997  		}
  1998  		if cert.Leaf != nil {
  1999  			t.Fatal("Leaf should not be populated")
  2000  		}
  2001  	})
  2002  	t.Run("x509keypairleaf=1", func(t *testing.T) {
  2003  		t.Setenv("GODEBUG", "x509keypairleaf=1")
  2004  		cert, err := X509KeyPair(certPEM, keyPEM)
  2005  		if err != nil {
  2006  			t.Fatal(err)
  2007  		}
  2008  		if cert.Leaf == nil {
  2009  			t.Fatal("Leaf should be populated")
  2010  		}
  2011  	})
  2012  	t.Run("GODEBUG unset", func(t *testing.T) {
  2013  		cert, err := X509KeyPair(certPEM, keyPEM)
  2014  		if err != nil {
  2015  			t.Fatal(err)
  2016  		}
  2017  		if cert.Leaf == nil {
  2018  			t.Fatal("Leaf should be populated")
  2019  		}
  2020  	})
  2021  }
  2022  
  2023  func TestEarlyLargeCertMsg(t *testing.T) {
  2024  	client, server := localPipe(t)
  2025  
  2026  	go func() {
  2027  		if _, err := client.Write([]byte{byte(recordTypeHandshake), 3, 4, 0, 4, typeCertificate, 1, 255, 255}); err != nil {
  2028  			t.Log(err)
  2029  		}
  2030  	}()
  2031  
  2032  	expectedErr := "tls: handshake message of length 131071 bytes exceeds maximum of 65536 bytes"
  2033  	servConn := Server(server, testConfig)
  2034  	err := servConn.Handshake()
  2035  	if err == nil {
  2036  		t.Fatal("unexpected success")
  2037  	}
  2038  	if err.Error() != expectedErr {
  2039  		t.Fatalf("unexpected error: got %q, want %q", err, expectedErr)
  2040  	}
  2041  }
  2042  
  2043  func TestLargeCertMsg(t *testing.T) {
  2044  	k, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
  2045  	if err != nil {
  2046  		t.Fatal(err)
  2047  	}
  2048  	tmpl := &x509.Certificate{
  2049  		SerialNumber: big.NewInt(1),
  2050  		Subject:      pkix.Name{CommonName: "test"},
  2051  		ExtraExtensions: []pkix.Extension{
  2052  			{
  2053  				Id: asn1.ObjectIdentifier{1, 2, 3},
  2054  				// Ballast to inflate the certificate beyond the
  2055  				// regular handshake record size.
  2056  				Value: make([]byte, 65536),
  2057  			},
  2058  		},
  2059  	}
  2060  	cert, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, k.Public(), k)
  2061  	if err != nil {
  2062  		t.Fatal(err)
  2063  	}
  2064  
  2065  	clientConfig, serverConfig := testConfig.Clone(), testConfig.Clone()
  2066  	clientConfig.InsecureSkipVerify = true
  2067  	serverConfig.Certificates = []Certificate{
  2068  		{
  2069  			Certificate: [][]byte{cert},
  2070  			PrivateKey:  k,
  2071  		},
  2072  	}
  2073  	if _, _, err := testHandshake(t, clientConfig, serverConfig); err != nil {
  2074  		t.Fatalf("unexpected failure :%s", err)
  2075  	}
  2076  }
  2077  

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