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crypto/tls: add Config.Clone

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In Go 1.0, the Config struct consisted only of exported fields.

In Go 1.1, it started to grow private, uncopyable fields (sync.Once,
sync.Mutex, etc).

Ever since, people have been writing their own private Config.Clone
methods, or risking it and doing a language-level shallow copy and
copying the unexported sync variables.

Clean this up and export the Config.clone method as Config.Clone.
This matches the convention of Template.Clone from text/template and
html/template at least.

Fixes #15771
Updates #16228 (needs update in x/net/http2 before fixed)
Updates #16492 (not sure whether @agl wants to do more)

Change-Id: I48c2825d4fef55a75d2f99640a7079c56fce39ca
Reviewed-on: https://go-review.googlesource.com/28075
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
This commit is contained in:
Brad Fitzpatrick 2016-08-30 03:19:01 +00:00
parent cd0ba4c169
commit d24f446a90
8 changed files with 50 additions and 71 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/crypto/tls/common.go
View File

@ -430,8 +430,9 @@ func ticketKeyFromBytes(b [32]byte) (key ticketKey) {
return key
}
// clone returns a copy of c. Only the exported fields are copied.
func (c *Config) clone() *Config {
// Clone returns a shallow clone of c.
// Only the exported fields are copied.
func (c *Config) Clone() *Config {
return &Config{
Rand: c.Rand,
Time: c.Time,

8
src/crypto/tls/conn_test.go
View File

@ -124,7 +124,7 @@ func TestCertificateSelection(t *testing.T) {
func runDynamicRecordSizingTest(t *testing.T, config *Config) {
clientConn, serverConn := net.Pipe()
serverConfig := config.clone()
serverConfig := config.Clone()
serverConfig.DynamicRecordSizingDisabled = false
tlsConn := Server(serverConn, serverConfig)
@ -225,19 +225,19 @@ func runDynamicRecordSizingTest(t *testing.T, config *Config) {
}
func TestDynamicRecordSizingWithStreamCipher(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.CipherSuites = []uint16{TLS_RSA_WITH_RC4_128_SHA}
runDynamicRecordSizingTest(t, config)
}
func TestDynamicRecordSizingWithCBC(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.CipherSuites = []uint16{TLS_RSA_WITH_AES_256_CBC_SHA}
runDynamicRecordSizingTest(t, config)
}
func TestDynamicRecordSizingWithAEAD(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.CipherSuites = []uint16{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256}
runDynamicRecordSizingTest(t, config)
}

20
src/crypto/tls/handshake_client_test.go
View File

@ -535,7 +535,7 @@ func TestHandshakeClientECDHEECDSAAES128CBCSHA256(t *testing.T) {
}
func TestHandshakeClientCertRSA(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
cert, _ := X509KeyPair([]byte(clientCertificatePEM), []byte(clientKeyPEM))
config.Certificates = []Certificate{cert}
@ -571,7 +571,7 @@ func TestHandshakeClientCertRSA(t *testing.T) {
}
func TestHandshakeClientCertECDSA(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
cert, _ := X509KeyPair([]byte(clientECDSACertificatePEM), []byte(clientECDSAKeyPEM))
config.Certificates = []Certificate{cert}
@ -728,7 +728,7 @@ func TestLRUClientSessionCache(t *testing.T) {
}
func TestHandshakeClientKeyLog(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
buf := &bytes.Buffer{}
config.KeyLogWriter = buf
@ -769,7 +769,7 @@ func TestHandshakeClientKeyLog(t *testing.T) {
}
func TestHandshakeClientALPNMatch(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.NextProtos = []string{"proto2", "proto1"}
test := &clientTest{
@ -790,7 +790,7 @@ func TestHandshakeClientALPNMatch(t *testing.T) {
}
func TestHandshakeClientALPNNoMatch(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.NextProtos = []string{"proto3"}
test := &clientTest{
@ -814,7 +814,7 @@ func TestHandshakeClientALPNNoMatch(t *testing.T) {
const sctsBase64 = "ABIBaQFnAHUApLkJkLQYWBSHuxOizGdwCjw1mAT5G9+443fNDsgN3BAAAAFHl5nuFgAABAMARjBEAiAcS4JdlW5nW9sElUv2zvQyPoZ6ejKrGGB03gjaBZFMLwIgc1Qbbn+hsH0RvObzhS+XZhr3iuQQJY8S9G85D9KeGPAAdgBo9pj4H2SCvjqM7rkoHUz8cVFdZ5PURNEKZ6y7T0/7xAAAAUeX4bVwAAAEAwBHMEUCIDIhFDgG2HIuADBkGuLobU5a4dlCHoJLliWJ1SYT05z6AiEAjxIoZFFPRNWMGGIjskOTMwXzQ1Wh2e7NxXE1kd1J0QsAdgDuS723dc5guuFCaR+r4Z5mow9+X7By2IMAxHuJeqj9ywAAAUhcZIqHAAAEAwBHMEUCICmJ1rBT09LpkbzxtUC+Hi7nXLR0J+2PmwLp+sJMuqK+AiEAr0NkUnEVKVhAkccIFpYDqHOlZaBsuEhWWrYpg2RtKp0="
func TestHandshakClientSCTs(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
scts, err := base64.StdEncoding.DecodeString(sctsBase64)
if err != nil {
@ -849,7 +849,7 @@ func TestHandshakClientSCTs(t *testing.T) {
}
func TestRenegotiationRejected(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
test := &clientTest{
name: "RenegotiationRejected",
command: []string{"openssl", "s_server", "-state"},
@ -871,7 +871,7 @@ func TestRenegotiationRejected(t *testing.T) {
}
func TestRenegotiateOnce(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.Renegotiation = RenegotiateOnceAsClient
test := &clientTest{
@ -885,7 +885,7 @@ func TestRenegotiateOnce(t *testing.T) {
}
func TestRenegotiateTwice(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.Renegotiation = RenegotiateFreelyAsClient
test := &clientTest{
@ -899,7 +899,7 @@ func TestRenegotiateTwice(t *testing.T) {
}
func TestRenegotiateTwiceRejected(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.Renegotiation = RenegotiateOnceAsClient
test := &clientTest{

34
src/crypto/tls/handshake_server_test.go
View File

@ -130,7 +130,7 @@ func TestNoRC4ByDefault(t *testing.T) {
cipherSuites: []uint16{TLS_RSA_WITH_RC4_128_SHA},
compressionMethods: []uint8{compressionNone},
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
// Reset the enabled cipher suites to nil in order to test the
// defaults.
serverConfig.CipherSuites = nil
@ -147,7 +147,7 @@ func TestDontSelectECDSAWithRSAKey(t *testing.T) {
supportedCurves: []CurveID{CurveP256},
supportedPoints: []uint8{pointFormatUncompressed},
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
serverConfig.CipherSuites = clientHello.cipherSuites
serverConfig.Certificates = make([]Certificate, 1)
serverConfig.Certificates[0].Certificate = [][]byte{testECDSACertificate}
@ -172,7 +172,7 @@ func TestDontSelectRSAWithECDSAKey(t *testing.T) {
supportedCurves: []CurveID{CurveP256},
supportedPoints: []uint8{pointFormatUncompressed},
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
serverConfig.CipherSuites = clientHello.cipherSuites
// First test that it *does* work when the server's key is RSA.
testClientHello(t, serverConfig, clientHello)
@ -265,7 +265,7 @@ func TestTLS12OnlyCipherSuites(t *testing.T) {
reply, clientErr = cli.readHandshake()
c.Close()
}()
config := testConfig.clone()
config := testConfig.Clone()
config.CipherSuites = clientHello.cipherSuites
Server(s, config).Handshake()
s.Close()
@ -732,7 +732,7 @@ func TestHandshakeServerAES256GCMSHA384(t *testing.T) {
}
func TestHandshakeServerECDHEECDSAAES(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.Certificates = make([]Certificate, 1)
config.Certificates[0].Certificate = [][]byte{testECDSACertificate}
config.Certificates[0].PrivateKey = testECDSAPrivateKey
@ -748,7 +748,7 @@ func TestHandshakeServerECDHEECDSAAES(t *testing.T) {
}
func TestHandshakeServerKeyLog(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
buf := &bytes.Buffer{}
config.KeyLogWriter = buf
@ -785,7 +785,7 @@ func TestHandshakeServerKeyLog(t *testing.T) {
}
func TestHandshakeServerALPN(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.NextProtos = []string{"proto1", "proto2"}
test := &serverTest{
@ -806,7 +806,7 @@ func TestHandshakeServerALPN(t *testing.T) {
}
func TestHandshakeServerALPNNoMatch(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.NextProtos = []string{"proto3"}
test := &serverTest{
@ -841,7 +841,7 @@ func TestHandshakeServerSNI(t *testing.T) {
// TestHandshakeServerSNICertForName is similar to TestHandshakeServerSNI, but
// tests the dynamic GetCertificate method
func TestHandshakeServerSNIGetCertificate(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
// Replace the NameToCertificate map with a GetCertificate function
nameToCert := config.NameToCertificate
@ -863,7 +863,7 @@ func TestHandshakeServerSNIGetCertificate(t *testing.T) {
// GetCertificate method doesn't return a cert, we fall back to what's in
// the NameToCertificate map.
func TestHandshakeServerSNIGetCertificateNotFound(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.GetCertificate = func(clientHello *ClientHelloInfo) (*Certificate, error) {
return nil, nil
@ -881,7 +881,7 @@ func TestHandshakeServerSNIGetCertificateNotFound(t *testing.T) {
func TestHandshakeServerSNIGetCertificateError(t *testing.T) {
const errMsg = "TestHandshakeServerSNIGetCertificateError error"
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
serverConfig.GetCertificate = func(clientHello *ClientHelloInfo) (*Certificate, error) {
return nil, errors.New(errMsg)
}
@ -900,7 +900,7 @@ func TestHandshakeServerSNIGetCertificateError(t *testing.T) {
func TestHandshakeServerEmptyCertificates(t *testing.T) {
const errMsg = "TestHandshakeServerEmptyCertificates error"
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
serverConfig.GetCertificate = func(clientHello *ClientHelloInfo) (*Certificate, error) {
return nil, errors.New(errMsg)
}
@ -928,7 +928,7 @@ func TestHandshakeServerEmptyCertificates(t *testing.T) {
// TestCipherSuiteCertPreferance ensures that we select an RSA ciphersuite with
// an RSA certificate and an ECDSA ciphersuite with an ECDSA certificate.
func TestCipherSuiteCertPreferenceECDSA(t *testing.T) {
config := testConfig.clone()
config := testConfig.Clone()
config.CipherSuites = []uint16{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA}
config.PreferServerCipherSuites = true
@ -938,7 +938,7 @@ func TestCipherSuiteCertPreferenceECDSA(t *testing.T) {
}
runServerTestTLS12(t, test)
config = testConfig.clone()
config = testConfig.Clone()
config.CipherSuites = []uint16{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA}
config.Certificates = []Certificate{
{
@ -977,7 +977,7 @@ func TestResumptionDisabled(t *testing.T) {
sessionFilePath := tempFile("")
defer os.Remove(sessionFilePath)
config := testConfig.clone()
config := testConfig.Clone()
test := &serverTest{
name: "IssueTicketPreDisable",
@ -1090,7 +1090,7 @@ func TestClientAuth(t *testing.T) {
defer os.Remove(ecdsaKeyPath)
}
config := testConfig.clone()
config := testConfig.Clone()
config.ClientAuth = RequestClientCert
test := &serverTest{
@ -1127,7 +1127,7 @@ func TestSNIGivenOnFailure(t *testing.T) {
serverName: expectedServerName,
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
// Erase the server's cipher suites to ensure the handshake fails.
serverConfig.CipherSuites = nil

2
src/crypto/tls/tls.go
View File

@ -135,7 +135,7 @@ func DialWithDialer(dialer *net.Dialer, network, addr string, config *Config) (*
// from the hostname we're connecting to.
if config.ServerName == "" {
// Make a copy to avoid polluting argument or default.
c := config.clone()
c := config.Clone()
c.ServerName = hostname
config = c
}

22
src/crypto/tls/tls_test.go
View File

@ -241,7 +241,7 @@ func testConnReadNonzeroAndEOF(t *testing.T, delay time.Duration) error {
srvCh <- nil
return
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
srv := Server(sconn, serverConfig)
if err := srv.Handshake(); err != nil {
serr = fmt.Errorf("handshake: %v", err)
@ -251,7 +251,7 @@ func testConnReadNonzeroAndEOF(t *testing.T, delay time.Duration) error {
srvCh <- srv
}()
clientConfig := testConfig.clone()
clientConfig := testConfig.Clone()
conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
if err != nil {
t.Fatal(err)
@ -295,7 +295,7 @@ func TestTLSUniqueMatches(t *testing.T) {
if err != nil {
t.Fatal(err)
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
srv := Server(sconn, serverConfig)
if err := srv.Handshake(); err != nil {
t.Fatal(err)
@ -304,7 +304,7 @@ func TestTLSUniqueMatches(t *testing.T) {
}
}()
clientConfig := testConfig.clone()
clientConfig := testConfig.Clone()
clientConfig.ClientSessionCache = NewLRUClientSessionCache(1)
conn, err := Dial("tcp", ln.Addr().String(), clientConfig)
if err != nil {
@ -394,7 +394,7 @@ func TestConnCloseBreakingWrite(t *testing.T) {
srvCh <- nil
return
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
srv := Server(sconn, serverConfig)
if err := srv.Handshake(); err != nil {
serr = fmt.Errorf("handshake: %v", err)
@ -414,7 +414,7 @@ func TestConnCloseBreakingWrite(t *testing.T) {
Conn: cconn,
}
clientConfig := testConfig.clone()
clientConfig := testConfig.Clone()
tconn := Client(conn, clientConfig)
if err := tconn.Handshake(); err != nil {
t.Fatal(err)
@ -507,7 +507,7 @@ func TestClone(t *testing.T) {
f.Set(q)
}
c2 := c1.clone()
c2 := c1.Clone()
if !reflect.DeepEqual(&c1, c2) {
t.Errorf("clone failed to copy a field")
@ -555,7 +555,7 @@ func throughput(b *testing.B, totalBytes int64, dynamicRecordSizingDisabled bool
// (cannot call b.Fatal in goroutine)
panic(fmt.Errorf("accept: %v", err))
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
serverConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
srv := Server(sconn, serverConfig)
if err := srv.Handshake(); err != nil {
@ -568,7 +568,7 @@ func throughput(b *testing.B, totalBytes int64, dynamicRecordSizingDisabled bool
}()
b.SetBytes(totalBytes)
clientConfig := testConfig.clone()
clientConfig := testConfig.Clone()
clientConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
buf := make([]byte, bufsize)
@ -645,7 +645,7 @@ func latency(b *testing.B, bps int, dynamicRecordSizingDisabled bool) {
// (cannot call b.Fatal in goroutine)
panic(fmt.Errorf("accept: %v", err))
}
serverConfig := testConfig.clone()
serverConfig := testConfig.Clone()
serverConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
srv := Server(&slowConn{sconn, bps}, serverConfig)
if err := srv.Handshake(); err != nil {
@ -655,7 +655,7 @@ func latency(b *testing.B, bps int, dynamicRecordSizingDisabled bool) {
}
}()
clientConfig := testConfig.clone()
clientConfig := testConfig.Clone()
clientConfig.DynamicRecordSizingDisabled = dynamicRecordSizingDisabled
buf := make([]byte, 16384)

5
src/net/http/httptest/server.go
View File

@ -114,9 +114,10 @@ func (s *Server) StartTLS() {
}
existingConfig := s.TLS
s.TLS = new(tls.Config)
if existingConfig != nil {
*s.TLS = *existingConfig
s.TLS = existingConfig.Clone()
} else {
s.TLS = new(tls.Config)
}
if s.TLS.NextProtos == nil {
s.TLS.NextProtos = []string{"http/1.1"}

25
src/net/http/transport.go
View File

@ -2087,30 +2087,7 @@ func cloneTLSConfig(cfg *tls.Config) *tls.Config {
if cfg == nil {
return &tls.Config{}
}
return &tls.Config{
Rand: cfg.Rand,
Time: cfg.Time,
Certificates: cfg.Certificates,
NameToCertificate: cfg.NameToCertificate,
GetCertificate: cfg.GetCertificate,
RootCAs: cfg.RootCAs,
NextProtos: cfg.NextProtos,
ServerName: cfg.ServerName,
ClientAuth: cfg.ClientAuth,
ClientCAs: cfg.ClientCAs,
InsecureSkipVerify: cfg.InsecureSkipVerify,
CipherSuites: cfg.CipherSuites,
PreferServerCipherSuites: cfg.PreferServerCipherSuites,
SessionTicketsDisabled: cfg.SessionTicketsDisabled,
SessionTicketKey: cfg.SessionTicketKey,
ClientSessionCache: cfg.ClientSessionCache,
MinVersion: cfg.MinVersion,
MaxVersion: cfg.MaxVersion,
CurvePreferences: cfg.CurvePreferences,
DynamicRecordSizingDisabled: cfg.DynamicRecordSizingDisabled,
Renegotiation: cfg.Renegotiation,
KeyLogWriter: cfg.KeyLogWriter,
}
return cfg.Clone()
}
// cloneTLSClientConfig is like cloneTLSConfig but omits