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