From 3a888fc0596c29c42aa20d3d7be493ba887f78a9 Mon Sep 17 00:00:00 2001 From: Adam Langley Date: Tue, 2 Jul 2013 19:58:56 -0400 Subject: [PATCH] crypto/tls: implement TLS 1.2. This does not include AES-GCM yet. Also, it assumes that the handshake and certificate signature hash are always SHA-256, which is true of the ciphersuites that we currently support. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/10762044 --- cipher_suites.go | 10 +- common.go | 41 ++- conn.go | 8 +- handshake_client.go | 21 +- handshake_client_test.go | 271 +++++++++++++++++++ handshake_messages.go | 148 +++++++++- handshake_messages_test.go | 3 + handshake_server.go | 13 +- handshake_server_test.go | 538 ++++++++++++++++++++++++++++++++++++- key_agreement.go | 48 +++- prf.go | 133 +++++---- 11 files changed, 1141 insertions(+), 93 deletions(-) diff --git a/cipher_suites.go b/cipher_suites.go index a9cd5c4..30975f7 100644 --- a/cipher_suites.go +++ b/cipher_suites.go @@ -42,7 +42,7 @@ type cipherSuite struct { keyLen int macLen int ivLen int - ka func() keyAgreement + ka func(version uint16) keyAgreement // If elliptic is set, a server will only consider this ciphersuite if // the ClientHello indicated that the client supports an elliptic curve // and point format that we can handle. @@ -157,12 +157,14 @@ func (s tls10MAC) MAC(digestBuf, seq, header, data []byte) []byte { return s.h.Sum(digestBuf[:0]) } -func rsaKA() keyAgreement { +func rsaKA(version uint16) keyAgreement { return rsaKeyAgreement{} } -func ecdheRSAKA() keyAgreement { - return new(ecdheRSAKeyAgreement) +func ecdheRSAKA(version uint16) keyAgreement { + return &ecdheRSAKeyAgreement{ + version: version, + } } // mutualCipherSuite returns a cipherSuite given a list of supported diff --git a/common.go b/common.go index fb995a1..109b554 100644 --- a/common.go +++ b/common.go @@ -18,6 +18,7 @@ const ( VersionSSL30 = 0x0300 VersionTLS10 = 0x0301 VersionTLS11 = 0x0302 + VersionTLS12 = 0x0303 ) const ( @@ -27,7 +28,7 @@ const ( maxHandshake = 65536 // maximum handshake we support (protocol max is 16 MB) minVersion = VersionSSL30 - maxVersion = VersionTLS11 + maxVersion = VersionTLS12 ) // TLS record types. @@ -63,12 +64,13 @@ const ( // TLS extension numbers var ( - extensionServerName uint16 = 0 - extensionStatusRequest uint16 = 5 - extensionSupportedCurves uint16 = 10 - extensionSupportedPoints uint16 = 11 - extensionSessionTicket uint16 = 35 - extensionNextProtoNeg uint16 = 13172 // not IANA assigned + extensionServerName uint16 = 0 + extensionStatusRequest uint16 = 5 + extensionSupportedCurves uint16 = 10 + extensionSupportedPoints uint16 = 11 + extensionSignatureAlgorithms uint16 = 13 + extensionSessionTicket uint16 = 35 + extensionNextProtoNeg uint16 = 13172 // not IANA assigned ) // TLS Elliptic Curves @@ -99,6 +101,31 @@ const ( // Rest of these are reserved by the TLS spec ) +// Hash functions for TLS 1.2 (See RFC 5246, section A.4.1) +const ( + hashSHA1 uint8 = 2 + hashSHA256 uint8 = 4 +) + +// Signature algorithms for TLS 1.2 (See RFC 5246, section A.4.1) +const ( + signatureRSA uint8 = 1 + signatureECDSA uint8 = 3 +) + +// signatureAndHash mirrors the TLS 1.2, SignatureAndHashAlgorithm struct. See +// RFC 5246, section A.4.1. +type signatureAndHash struct { + hash, signature uint8 +} + +// supportedSignatureAlgorithms contains the signature and hash algorithms that +// the code will adverse as supported both in a TLS 1.2 ClientHello and +// CertificateRequest. +var supportedSignatureAlgorithms = []signatureAndHash{ + {hashSHA256, signatureRSA}, +} + // ConnectionState records basic TLS details about the connection. type ConnectionState struct { HandshakeComplete bool diff --git a/conn.go b/conn.go index 6cf8bd6..287f81c 100644 --- a/conn.go +++ b/conn.go @@ -748,7 +748,9 @@ func (c *Conn) readHandshake() (interface{}, error) { case typeCertificate: m = new(certificateMsg) case typeCertificateRequest: - m = new(certificateRequestMsg) + m = &certificateRequestMsg{ + hasSignatureAndHash: c.vers >= VersionTLS12, + } case typeCertificateStatus: m = new(certificateStatusMsg) case typeServerKeyExchange: @@ -758,7 +760,9 @@ func (c *Conn) readHandshake() (interface{}, error) { case typeClientKeyExchange: m = new(clientKeyExchangeMsg) case typeCertificateVerify: - m = new(certificateVerifyMsg) + m = &certificateVerifyMsg{ + hasSignatureAndHash: c.vers >= VersionTLS12, + } case typeNextProtocol: m = new(nextProtoMsg) case typeFinished: diff --git a/handshake_client.go b/handshake_client.go index e8196fb..a60e217 100644 --- a/handshake_client.go +++ b/handshake_client.go @@ -6,7 +6,6 @@ package tls import ( "bytes" - "crypto" "crypto/rsa" "crypto/subtle" "crypto/x509" @@ -16,8 +15,6 @@ import ( ) func (c *Conn) clientHandshake() error { - finishedHash := newFinishedHash(VersionTLS10) - if c.config == nil { c.config = defaultConfig() } @@ -45,7 +42,10 @@ func (c *Conn) clientHandshake() error { return errors.New("short read from Rand") } - finishedHash.Write(hello.marshal()) + if hello.vers >= VersionTLS12 { + hello.signatureAndHashes = supportedSignatureAlgorithms + } + c.writeRecord(recordTypeHandshake, hello.marshal()) msg, err := c.readHandshake() @@ -56,7 +56,6 @@ func (c *Conn) clientHandshake() error { if !ok { return c.sendAlert(alertUnexpectedMessage) } - finishedHash.Write(serverHello.marshal()) vers, ok := c.config.mutualVersion(serverHello.vers) if !ok || vers < VersionTLS10 { @@ -66,6 +65,10 @@ func (c *Conn) clientHandshake() error { c.vers = vers c.haveVers = true + finishedHash := newFinishedHash(c.vers) + finishedHash.Write(hello.marshal()) + finishedHash.Write(serverHello.marshal()) + if serverHello.compressionMethod != compressionNone { return c.sendAlert(alertUnexpectedMessage) } @@ -148,7 +151,7 @@ func (c *Conn) clientHandshake() error { return err } - keyAgreement := suite.ka() + keyAgreement := suite.ka(c.vers) skx, ok := msg.(*serverKeyExchangeMsg) if ok { @@ -269,10 +272,8 @@ func (c *Conn) clientHandshake() error { if chainToSend != nil { certVerify := new(certificateVerifyMsg) - digest := make([]byte, 0, 36) - digest = finishedHash.serverMD5.Sum(digest) - digest = finishedHash.serverSHA1.Sum(digest) - signed, err := rsa.SignPKCS1v15(c.config.rand(), c.config.Certificates[0].PrivateKey.(*rsa.PrivateKey), crypto.MD5SHA1, digest) + digest, hashFunc := finishedHash.hashForClientCertificate() + signed, err := rsa.SignPKCS1v15(c.config.rand(), c.config.Certificates[0].PrivateKey.(*rsa.PrivateKey), hashFunc, digest) if err != nil { return c.sendAlert(alertInternalError) } diff --git a/handshake_client_test.go b/handshake_client_test.go index 031ad72..1823ef1 100644 --- a/handshake_client_test.go +++ b/handshake_client_test.go @@ -65,6 +65,15 @@ func TestHandshakeClientTLS11(t *testing.T) { testClientScript(t, "TLS11-ECDHE-AES", tls11ECDHEAESClientScript, &config) } +func TestHandshakeClientTLS12(t *testing.T) { + config := *testConfig + config.MaxVersion = VersionTLS12 + config.CipherSuites = []uint16{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA} + cert, _ := X509KeyPair(testClientChainCertificate, testClientChainCertificate) + config.Certificates = []Certificate{cert} + testClientScript(t, "TLS12", clientTLS12Script, &config) +} + var connect = flag.Bool("connect", false, "connect to a TLS server on :10443") func TestRunClient(t *testing.T) { @@ -1802,6 +1811,268 @@ var clientChainCertificateScript = [][]byte{ }, } +var clientTLS12Script = [][]byte{ + { + 0x16, 0x03, 0x01, 0x00, 0x52, 0x01, 0x00, 0x00, + 0x4e, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xc0, 0x13, + 0x01, 0x00, 0x00, 0x23, 0x00, 0x05, 0x00, 0x05, + 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x00, + 0x08, 0x00, 0x06, 0x00, 0x17, 0x00, 0x18, 0x00, + 0x19, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00, 0x00, + 0x0d, 0x00, 0x04, 0x00, 0x02, 0x04, 0x01, + }, + { + 0x16, 0x03, 0x03, 0x00, 0x54, 0x02, 0x00, 0x00, + 0x50, 0x03, 0x03, 0x51, 0xcd, 0xe6, 0x5e, 0x4c, + 0x36, 0x2f, 0xe1, 0x38, 0x6c, 0xff, 0x9c, 0xe2, + 0x0f, 0xbb, 0x04, 0x6d, 0x82, 0xa6, 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0x3b, 0x9c, + 0x67, 0xae, 0xb8, 0xa6, 0x70, 0xa9, 0x03, 0xb4, + 0x37, 0x7b, 0xe4, 0x2f, 0x7c, 0x42, 0x4f, 0xaa, + 0x9a, 0x5d, 0x10, 0x65, 0xc1, 0xa5, 0x33, 0xff, + 0xc5, 0xdf, 0x24, 0xdb, 0x8f, 0xe2, 0x14, 0xee, + 0x00, 0x04, 0x01, 0x01, 0x00, 0x76, 0xcf, 0xe6, + 0x47, 0xcf, 0xc1, 0x58, 0xf5, 0x5d, 0x3a, 0x0b, + 0xd5, 0x4e, 0xb1, 0x08, 0xa6, 0x03, 0x8b, 0xa3, + 0x7b, 0x9c, 0xa2, 0x3b, 0x99, 0x7e, 0x42, 0x0d, + 0x38, 0x6e, 0x9a, 0x5e, 0xf7, 0x45, 0x7f, 0xf3, + 0x51, 0xa2, 0xe6, 0xae, 0x1c, 0x55, 0x2a, 0x58, + 0x13, 0x55, 0xa9, 0x93, 0xac, 0x6a, 0x1e, 0xd6, + 0xd9, 0x98, 0x89, 0x93, 0x16, 0x8f, 0xab, 0xc5, + 0x65, 0x65, 0x62, 0x68, 0xd8, 0xbf, 0xbd, 0x4e, + 0x1a, 0x17, 0x24, 0x9c, 0x3c, 0x56, 0xf5, 0x8f, + 0xda, 0x6e, 0x03, 0xe7, 0xe9, 0xce, 0xe5, 0xb1, + 0x68, 0xd8, 0x88, 0xdb, 0xde, 0xfe, 0x98, 0xbe, + 0x9d, 0x1f, 0x86, 0xbf, 0x36, 0xe5, 0xe9, 0x77, + 0xc3, 0xa6, 0xa3, 0x30, 0x60, 0x9f, 0x36, 0x65, + 0x4c, 0xe5, 0xb6, 0x3f, 0xf8, 0x15, 0x76, 0xac, + 0x4f, 0xb5, 0x8a, 0x98, 0xe3, 0xc2, 0xbd, 0x13, + 0xff, 0x59, 0xfd, 0x22, 0xbf, 0xb3, 0x02, 0xab, + 0xf1, 0x82, 0xff, 0x4c, 0x41, 0x81, 0x15, 0xa5, + 0xc7, 0x56, 0x93, 0xc3, 0xb0, 0xd2, 0x70, 0x84, + 0xb6, 0x27, 0x43, 0x47, 0x38, 0x3a, 0xcf, 0x20, + 0xa4, 0x97, 0x61, 0xc7, 0xf9, 0xb2, 0x01, 0xea, + 0x83, 0x72, 0x00, 0x74, 0x3e, 0x41, 0xd0, 0x24, + 0x32, 0xf7, 0xe1, 0x68, 0xae, 0x06, 0xcb, 0x70, + 0x06, 0x3a, 0x3a, 0xd3, 0x97, 0x7e, 0xaa, 0x27, + 0xb7, 0xcc, 0xd3, 0x7f, 0xb2, 0x07, 0x9e, 0x85, + 0x16, 0x25, 0x28, 0xee, 0xc7, 0x29, 0x09, 0x56, + 0x94, 0x6c, 0x7e, 0xe4, 0x61, 0x7b, 0xc2, 0xd5, + 0x03, 0x46, 0x71, 0x69, 0xc0, 0x90, 0x0e, 0x58, + 0xc6, 0xef, 0xf5, 0x23, 0x03, 0x42, 0x92, 0x1a, + 0x2f, 0x4b, 0x0a, 0x5d, 0x74, 0x71, 0x28, 0x5a, + 0x83, 0xf2, 0x00, 0x79, 0x65, 0x89, 0x61, 0x87, + 0x31, 0xf0, 0x09, 0x89, 0x6a, 0xc4, 0x48, 0xee, + 0x78, 0xf1, 0x65, 0x3f, 0xe1, 0x16, 0x03, 0x03, + 0x00, 0x5a, 0x0d, 0x00, 0x00, 0x52, 0x03, 0x01, + 0x02, 0x40, 0x00, 0x20, 0x06, 0x01, 0x06, 0x02, + 0x06, 0x03, 0x05, 0x01, 0x05, 0x02, 0x05, 0x03, + 0x04, 0x01, 0x04, 0x02, 0x04, 0x03, 0x03, 0x01, + 0x03, 0x02, 0x03, 0x03, 0x02, 0x01, 0x02, 0x02, + 0x02, 0x03, 0x01, 0x01, 0x00, 0x2a, 0x00, 0x28, + 0x30, 0x26, 0x31, 0x10, 0x30, 0x0e, 0x06, 0x03, + 0x55, 0x04, 0x0a, 0x13, 0x07, 0x41, 0x63, 0x6d, + 0x65, 0x20, 0x43, 0x6f, 0x31, 0x12, 0x30, 0x10, + 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x09, 0x31, + 0x32, 0x37, 0x2e, 0x30, 0x2e, 0x30, 0x2e, 0x31, + 0x0e, 0x00, 0x00, 0x00, + }, + { + 0x16, 0x03, 0x03, 0x00, 0x07, 0x0b, 0x00, 0x00, + 0x03, 0x00, 0x00, 0x00, 0x16, 0x03, 0x03, 0x00, + 0x46, 0x10, 0x00, 0x00, 0x42, 0x41, 0x04, 0x1e, + 0x18, 0x37, 0xef, 0x0d, 0x19, 0x51, 0x88, 0x35, + 0x75, 0x71, 0xb5, 0xe5, 0x54, 0x5b, 0x12, 0x2e, + 0x8f, 0x09, 0x67, 0xfd, 0xa7, 0x24, 0x20, 0x3e, + 0xb2, 0x56, 0x1c, 0xce, 0x97, 0x28, 0x5e, 0xf8, + 0x2b, 0x2d, 0x4f, 0x9e, 0xf1, 0x07, 0x9f, 0x6c, + 0x4b, 0x5b, 0x83, 0x56, 0xe2, 0x32, 0x42, 0xe9, + 0x58, 0xb6, 0xd7, 0x49, 0xa6, 0xb5, 0x68, 0x1a, + 0x41, 0x03, 0x56, 0x6b, 0xdc, 0x5a, 0x89, 0x14, + 0x03, 0x03, 0x00, 0x01, 0x01, 0x16, 0x03, 0x03, + 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x1f, 0xb8, 0x47, 0xfb, 0xd2, 0xba, + 0x62, 0x74, 0x63, 0x54, 0xb8, 0x03, 0x7b, 0xb9, + 0x05, 0x87, 0x60, 0x6f, 0xb9, 0xfc, 0x79, 0x96, + 0xce, 0xf0, 0x84, 0x77, 0x23, 0x1b, 0x44, 0x3f, + 0x33, 0xe8, 0x71, 0x97, 0x9d, 0xd3, 0x7d, 0x43, + 0x40, 0xd3, 0x95, 0x65, 0x1f, 0x2c, 0x30, 0xfd, + 0x7f, 0xac, + }, + { + 0x14, 0x03, 0x03, 0x00, 0x01, 0x01, 0x16, 0x03, + 0x03, 0x00, 0x40, 0x64, 0x09, 0x6c, 0x06, 0x5a, + 0x01, 0x24, 0x10, 0xd9, 0x92, 0x66, 0xe6, 0x28, + 0x43, 0x2f, 0xba, 0x0b, 0x17, 0x61, 0x55, 0x42, + 0x9d, 0xc3, 0x59, 0xba, 0x57, 0x19, 0x1b, 0x74, + 0x22, 0x40, 0xc7, 0x13, 0x95, 0x83, 0xe6, 0xf3, + 0x11, 0x62, 0xe6, 0xde, 0xfc, 0xf3, 0x1a, 0xd1, + 0x3d, 0xce, 0xd1, 0xf9, 0xeb, 0x2e, 0x13, 0x39, + 0xa6, 0xdb, 0x04, 0x79, 0xaa, 0x2d, 0xe1, 0xa4, + 0xd0, 0xf9, 0x36, + }, + { + 0x17, 0x03, 0x03, 0x00, 0x30, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x88, 0x3d, + 0xcb, 0x65, 0xc1, 0xac, 0x94, 0xc5, 0x1d, 0x4d, + 0xc5, 0x1e, 0xd4, 0x17, 0xe3, 0x83, 0xac, 0x14, + 0x80, 0x92, 0x2d, 0x5b, 0x42, 0x19, 0xcb, 0x51, + 0xc9, 0x48, 0xdf, 0xf6, 0x27, 0x15, 0x03, 0x03, + 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0xf7, 0xc2, 0xed, 0x1a, 0x88, 0xb6, + 0xb8, 0x26, 0x04, 0x31, 0x89, 0xab, 0x29, 0x34, + 0xce, 0x84, 0x81, 0x33, 0x64, 0x8e, 0x53, 0xa3, + 0xaf, 0x8b, 0x5a, 0x50, 0x43, 0xab, 0x77, 0x77, + 0xa3, 0xc7, + }, +} + var testClientChainCertificate = fromHex( "2d2d2d2d2d424547494e2050524956415445204b" + "45592d2d2d2d2d0a4d494945766749424144414e" + diff --git a/handshake_messages.go b/handshake_messages.go index cdd4917..8395200 100644 --- a/handshake_messages.go +++ b/handshake_messages.go @@ -20,6 +20,7 @@ type clientHelloMsg struct { supportedPoints []uint8 ticketSupported bool sessionTicket []uint8 + signatureAndHashes []signatureAndHash } func (m *clientHelloMsg) equal(i interface{}) bool { @@ -40,7 +41,8 @@ func (m *clientHelloMsg) equal(i interface{}) bool { eqUint16s(m.supportedCurves, m1.supportedCurves) && bytes.Equal(m.supportedPoints, m1.supportedPoints) && m.ticketSupported == m1.ticketSupported && - bytes.Equal(m.sessionTicket, m1.sessionTicket) + bytes.Equal(m.sessionTicket, m1.sessionTicket) && + eqSignatureAndHashes(m.signatureAndHashes, m1.signatureAndHashes) } func (m *clientHelloMsg) marshal() []byte { @@ -74,6 +76,10 @@ func (m *clientHelloMsg) marshal() []byte { extensionsLength += len(m.sessionTicket) numExtensions++ } + if len(m.signatureAndHashes) > 0 { + extensionsLength += 2 + 2*len(m.signatureAndHashes) + numExtensions++ + } if numExtensions > 0 { extensionsLength += 4 * numExtensions length += 2 + extensionsLength @@ -199,6 +205,25 @@ func (m *clientHelloMsg) marshal() []byte { copy(z, m.sessionTicket) z = z[len(m.sessionTicket):] } + if len(m.signatureAndHashes) > 0 { + // https://tools.ietf.org/html/rfc5246#section-7.4.1.4.1 + z[0] = byte(extensionSignatureAlgorithms >> 8) + z[1] = byte(extensionSignatureAlgorithms) + l := 2 + 2*len(m.signatureAndHashes) + z[2] = byte(l >> 8) + z[3] = byte(l) + z = z[4:] + + l -= 2 + z[0] = byte(l >> 8) + z[1] = byte(l) + z = z[2:] + for _, sigAndHash := range m.signatureAndHashes { + z[0] = sigAndHash.hash + z[1] = sigAndHash.signature + z = z[2:] + } + } m.raw = x @@ -249,6 +274,7 @@ func (m *clientHelloMsg) unmarshal(data []byte) bool { m.ocspStapling = false m.ticketSupported = false m.sessionTicket = nil + m.signatureAndHashes = nil if len(data) == 0 { // ClientHello is optionally followed by extension data @@ -336,6 +362,23 @@ func (m *clientHelloMsg) unmarshal(data []byte) bool { // http://tools.ietf.org/html/rfc5077#section-3.2 m.ticketSupported = true m.sessionTicket = data[:length] + case extensionSignatureAlgorithms: + // https://tools.ietf.org/html/rfc5246#section-7.4.1.4.1 + if length < 2 || length&1 != 0 { + return false + } + l := int(data[0])<<8 | int(data[1]) + if l != length-2 { + return false + } + n := l / 2 + d := data[2:] + m.signatureAndHashes = make([]signatureAndHash, n) + for i := range m.signatureAndHashes { + m.signatureAndHashes[i].hash = d[0] + m.signatureAndHashes[i].signature = d[1] + d = d[2:] + } } data = data[length:] } @@ -899,8 +942,14 @@ func (m *nextProtoMsg) unmarshal(data []byte) bool { } type certificateRequestMsg struct { - raw []byte + raw []byte + // hasSignatureAndHash indicates whether this message includes a list + // of signature and hash functions. This change was introduced with TLS + // 1.2. + hasSignatureAndHash bool + certificateTypes []byte + signatureAndHashes []signatureAndHash certificateAuthorities [][]byte } @@ -912,7 +961,8 @@ func (m *certificateRequestMsg) equal(i interface{}) bool { return bytes.Equal(m.raw, m1.raw) && bytes.Equal(m.certificateTypes, m1.certificateTypes) && - eqByteSlices(m.certificateAuthorities, m1.certificateAuthorities) + eqByteSlices(m.certificateAuthorities, m1.certificateAuthorities) && + eqSignatureAndHashes(m.signatureAndHashes, m1.signatureAndHashes) } func (m *certificateRequestMsg) marshal() (x []byte) { @@ -928,6 +978,10 @@ func (m *certificateRequestMsg) marshal() (x []byte) { } length += casLength + if m.hasSignatureAndHash { + length += 2 + 2*len(m.signatureAndHashes) + } + x = make([]byte, 4+length) x[0] = typeCertificateRequest x[1] = uint8(length >> 16) @@ -938,6 +992,19 @@ func (m *certificateRequestMsg) marshal() (x []byte) { copy(x[5:], m.certificateTypes) y := x[5+len(m.certificateTypes):] + + if m.hasSignatureAndHash { + n := len(m.signatureAndHashes) * 2 + y[0] = uint8(n >> 8) + y[1] = uint8(n) + y = y[2:] + for _, sigAndHash := range m.signatureAndHashes { + y[0] = sigAndHash.hash + y[1] = sigAndHash.signature + y = y[2:] + } + } + y[0] = uint8(casLength >> 8) y[1] = uint8(casLength) y = y[2:] @@ -978,6 +1045,27 @@ func (m *certificateRequestMsg) unmarshal(data []byte) bool { data = data[numCertTypes:] + if m.hasSignatureAndHash { + if len(data) < 2 { + return false + } + sigAndHashLen := uint16(data[0])<<8 | uint16(data[1]) + data = data[2:] + if sigAndHashLen&1 != 0 { + return false + } + if len(data) < int(sigAndHashLen) { + return false + } + numSigAndHash := sigAndHashLen / 2 + m.signatureAndHashes = make([]signatureAndHash, numSigAndHash) + for i := range m.signatureAndHashes { + m.signatureAndHashes[i].hash = data[0] + m.signatureAndHashes[i].signature = data[1] + data = data[2:] + } + } + if len(data) < 2 { return false } @@ -1013,8 +1101,10 @@ func (m *certificateRequestMsg) unmarshal(data []byte) bool { } type certificateVerifyMsg struct { - raw []byte - signature []byte + raw []byte + hasSignatureAndHash bool + signatureAndHash signatureAndHash + signature []byte } func (m *certificateVerifyMsg) equal(i interface{}) bool { @@ -1024,6 +1114,9 @@ func (m *certificateVerifyMsg) equal(i interface{}) bool { } return bytes.Equal(m.raw, m1.raw) && + m.hasSignatureAndHash == m1.hasSignatureAndHash && + m.signatureAndHash.hash == m1.signatureAndHash.hash && + m.signatureAndHash.signature == m1.signatureAndHash.signature && bytes.Equal(m.signature, m1.signature) } @@ -1035,14 +1128,23 @@ func (m *certificateVerifyMsg) marshal() (x []byte) { // See http://tools.ietf.org/html/rfc4346#section-7.4.8 siglength := len(m.signature) length := 2 + siglength + if m.hasSignatureAndHash { + length += 2 + } x = make([]byte, 4+length) x[0] = typeCertificateVerify x[1] = uint8(length >> 16) x[2] = uint8(length >> 8) x[3] = uint8(length) - x[4] = uint8(siglength >> 8) - x[5] = uint8(siglength) - copy(x[6:], m.signature) + y := x[4:] + if m.hasSignatureAndHash { + y[0] = m.signatureAndHash.hash + y[1] = m.signatureAndHash.signature + y = y[2:] + } + y[0] = uint8(siglength >> 8) + y[1] = uint8(siglength) + copy(y[2:], m.signature) m.raw = x @@ -1061,12 +1163,23 @@ func (m *certificateVerifyMsg) unmarshal(data []byte) bool { return false } - siglength := int(data[4])<<8 + int(data[5]) - if len(data)-6 != siglength { + data = data[4:] + if m.hasSignatureAndHash { + m.signatureAndHash.hash = data[0] + m.signatureAndHash.signature = data[1] + data = data[2:] + } + + if len(data) < 2 { + return false + } + siglength := int(data[0])<<8 + int(data[1]) + data = data[2:] + if len(data) != siglength { return false } - m.signature = data[6:] + m.signature = data return true } @@ -1165,3 +1278,16 @@ func eqByteSlices(x, y [][]byte) bool { } return true } + +func eqSignatureAndHashes(x, y []signatureAndHash) bool { + if len(x) != len(y) { + return false + } + for i, v := range x { + v2 := y[i] + if v.hash != v2.hash || v.signature != v2.signature { + return false + } + } + return true +} diff --git a/handshake_messages_test.go b/handshake_messages_test.go index 3434bad..a6da0d1 100644 --- a/handshake_messages_test.go +++ b/handshake_messages_test.go @@ -135,6 +135,9 @@ func (*clientHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value { m.sessionTicket = randomBytes(rand.Intn(300), rand) } } + if rand.Intn(10) > 5 { + m.signatureAndHashes = supportedSignatureAlgorithms + } return reflect.ValueOf(m) } diff --git a/handshake_server.go b/handshake_server.go index 0c96a2b..c7ee88d 100644 --- a/handshake_server.go +++ b/handshake_server.go @@ -5,7 +5,6 @@ package tls import ( - "crypto" "crypto/rsa" "crypto/subtle" "crypto/x509" @@ -292,7 +291,7 @@ func (hs *serverHandshakeState) doFullHandshake() error { c.writeRecord(recordTypeHandshake, certStatus.marshal()) } - keyAgreement := hs.suite.ka() + keyAgreement := hs.suite.ka(c.vers) skx, err := keyAgreement.generateServerKeyExchange(config, cert, hs.clientHello, hs.hello) if err != nil { c.sendAlert(alertHandshakeFailure) @@ -307,6 +306,10 @@ func (hs *serverHandshakeState) doFullHandshake() error { // Request a client certificate certReq := new(certificateRequestMsg) certReq.certificateTypes = []byte{certTypeRSASign} + if c.vers >= VersionTLS12 { + certReq.hasSignatureAndHash = true + certReq.signatureAndHashes = supportedSignatureAlgorithms + } // An empty list of certificateAuthorities signals to // the client that it may send any certificate in response @@ -383,10 +386,8 @@ func (hs *serverHandshakeState) doFullHandshake() error { return c.sendAlert(alertUnexpectedMessage) } - digest := make([]byte, 0, 36) - digest = hs.finishedHash.serverMD5.Sum(digest) - digest = hs.finishedHash.serverSHA1.Sum(digest) - err = rsa.VerifyPKCS1v15(pub, crypto.MD5SHA1, digest, certVerify.signature) + digest, hashFunc := hs.finishedHash.hashForClientCertificate() + err = rsa.VerifyPKCS1v15(pub, hashFunc, digest, certVerify.signature) if err != nil { c.sendAlert(alertBadCertificate) return errors.New("could not validate signature of connection nonces: " + err.Error()) diff --git a/handshake_server_test.go b/handshake_server_test.go index 98a57fc..6739a3e 100644 --- a/handshake_server_test.go +++ b/handshake_server_test.go @@ -112,7 +112,7 @@ func TestAlertForwarding(t *testing.T) { err := Server(s, testConfig).Handshake() s.Close() if e, ok := err.(*net.OpError); !ok || e.Err != error(alertUnknownCA) { - t.Errorf("Got error: %s; expected: %s", err, alertUnknownCA) + t.Errorf("Got error: %s; expected: %s", err, error(alertUnknownCA)) } } @@ -147,6 +147,7 @@ func TestCipherSuitePreference(t *testing.T) { serverConfig := &Config{ CipherSuites: []uint16{TLS_RSA_WITH_RC4_128_SHA, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA}, Certificates: testConfig.Certificates, + MaxVersion: VersionTLS11, } clientConfig := &Config{ CipherSuites: []uint16{TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_RC4_128_SHA}, @@ -247,6 +248,15 @@ func TestResumption(t *testing.T) { testServerScript(t, "Resume", serverResumeTest, testConfig, nil) } +func TestTLS12ClientCertServer(t *testing.T) { + config := *testConfig + config.MaxVersion = VersionTLS12 + config.ClientAuth = RequireAnyClientCert + config.CipherSuites = []uint16{TLS_ECDHE_RSA_WITH_RC4_128_SHA} + + testServerScript(t, "TLS12", tls12ServerScript, &config, nil) +} + type clientauthTest struct { name string clientauth ClientAuthType @@ -2223,6 +2233,532 @@ var tls11ECDHEAESServerScript = [][]byte{ }, } +var tls12ServerScript = [][]byte{ + { + 0x16, 0x03, 0x01, 0x01, 0x46, 0x01, 0x00, 0x01, + 0x42, 0x03, 0x03, 0x51, 0xcd, 0xe6, 0xe3, 0xe1, + 0xb7, 0xb8, 0xf9, 0x20, 0xea, 0xc5, 0x8a, 0xe2, + 0x8b, 0x07, 0x5a, 0x11, 0x0e, 0x54, 0x3c, 0x4f, + 0x36, 0x06, 0x64, 0x7b, 0x0e, 0xc4, 0xf8, 0x75, + 0x99, 0x9d, 0x5a, 0x00, 0x00, 0xd0, 0xc0, 0x30, + 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0x0d, 0x44, 0x4c, 0x71, 0x32, 0xf5, + 0xb2, 0x0c, 0x5a, 0xc8, 0xfa, 0xa8, 0xcf, 0x35, + 0x68, 0xd8, 0x55, 0xa2, 0xb2, 0x65, 0xe5, 0x55, + 0x28, 0x2e, 0xc3, 0x69, 0xf8, 0x75, 0x8d, 0x6d, + 0x5f, 0xfb, 0x44, 0xb1, 0xf0, 0x86, 0xe5, 0xde, + 0x0f, 0xe7, 0x51, 0x96, 0x7f, 0x00, 0xa2, 0x1e, + 0xe2, 0x4b, 0x86, 0xe7, 0x4c, 0xdc, 0x95, 0x53, + 0xc5, 0xaa, 0x5a, 0x05, 0x5c, 0xa0, 0xde, 0xa8, + 0xc5, 0x6a, 0xb2, 0x09, 0xd4, 0xa0, 0xed, 0xe1, + 0x85, 0xb9, 0xa3, 0xde, 0x2b, 0x4d, 0xf9, 0x4a, + 0x72, 0x50, 0x26, 0xae, 0xf9, 0xc7, 0x78, 0x63, + 0x20, 0xa2, 0xc4, 0x88, 0xbe, 0xc6, 0x29, 0x4b, + 0xfc, 0x9c, 0x3d, 0x38, 0x6b, 0x60, 0x76, 0xe9, + 0xf7, 0xaa, 0x28, 0xc4, 0xe1, 0xfc, 0xfe, 0x3a, + 0xc3, 0x90, 0xb2, 0x2c, 0x7b, 0x10, 0xce, 0xe3, + 0xe9, 0x81, 0x87, 0x93, 0x26, 0x2f, 0x97, 0x30, + 0x4b, 0xf7, 0x10, 0x8e, 0x36, 0xf7, 0x00, 0x3e, + 0xf8, 0xd4, 0x56, 0xa7, 0x37, 0x07, 0x25, 0x19, + 0x03, 0x38, 0x0b, 0xdd, 0xec, 0x1a, 0x4f, 0xab, + 0x43, 0xd2, 0x34, 0x65, 0xba, 0x9f, 0x39, 0xfc, + 0x95, 0x1a, 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0x8f, 0x88, 0x8c, 0x2e, 0xde, 0xd5, + 0x7d, 0x34, 0x9c, 0x16, 0x15, 0xa0, 0x58, 0x7d, + 0xe5, 0xab, 0xe6, 0xdc, 0x5f, 0xaa, 0x73, 0x34, + 0xa9, 0x69, 0xe7, 0x07, 0x11, 0x10, 0xa7, 0x58, + 0x63, 0xad, 0x5c, 0x89, 0x36, 0x9f, 0x1e, 0x35, + 0x34, 0x79, 0xbc, 0x79, 0x31, 0xcd, 0x2e, 0x06, + 0x97, 0x4c, 0x39, 0xfb, 0xba, 0xfa, 0x17, 0x77, + 0x3f, 0x6c, 0xd3, 0x0b, 0x23, 0x37, 0x08, 0xa4, + 0x5d, 0x3c, 0x04, 0xc1, 0x2a, 0xc2, 0x93, 0x2b, + 0xc0, 0xec, 0x7d, 0x61, 0x1f, 0xa2, 0x54, 0x92, + 0xda, 0x86, 0x34, 0x01, 0x40, 0x48, 0x7f, 0xaf, + 0x88, 0xfd, 0x3a, 0x05, 0x98, 0xd0, 0xb7, 0x81, + 0x4d, 0x60, 0x76, 0x8b, 0x39, 0x6e, 0x33, 0x97, + 0x99, 0xfa, 0x93, 0x0f, 0x7b, 0xb3, 0xaf, 0x95, + 0xb9, 0xdb, 0xa1, 0xcc, 0x8b, 0x32, 0x14, 0x03, + 0x03, 0x00, 0x01, 0x01, 0x16, 0x03, 0x03, 0x00, + 0x24, 0x53, 0x06, 0xc3, 0x99, 0xce, 0x22, 0x41, + 0x0e, 0x81, 0x2d, 0x6b, 0x35, 0xae, 0xd5, 0x7d, + 0x7e, 0x6b, 0xb4, 0xe9, 0xe9, 0x06, 0xbc, 0x5b, + 0x3b, 0xf2, 0x77, 0x2e, 0x0c, 0x2b, 0xba, 0x96, + 0x93, 0xb7, 0x2e, 0x1d, 0x49, 0x17, 0x03, 0x03, + 0x00, 0x21, 0x41, 0xb5, 0x78, 0xc2, 0xcb, 0x4e, + 0x52, 0x72, 0x2b, 0xdf, 0x9b, 0xc6, 0x75, 0x24, + 0xe1, 0x58, 0xb8, 0xe1, 0x78, 0x39, 0xa0, 0xe4, + 0x74, 0x00, 0xee, 0x6b, 0xb5, 0xbe, 0xe7, 0x48, + 0xbe, 0x61, 0x69, 0x15, 0x03, 0x03, 0x00, 0x16, + 0xcc, 0xf1, 0x43, 0x54, 0x49, 0xd3, 0x17, 0xd1, + 0x7a, 0xc0, 0x40, 0x05, 0xd0, 0x9e, 0x22, 0xbd, + 0x5b, 0x5c, 0xd9, 0x7f, 0xce, 0x34, + }, +} + // cert.pem and key.pem were generated with generate_cert.go // Thus, they have no ExtKeyUsage fields and trigger an error // when verification is turned on. diff --git a/key_agreement.go b/key_agreement.go index 1bf92c8..c069c07 100644 --- a/key_agreement.go +++ b/key_agreement.go @@ -10,6 +10,7 @@ import ( "crypto/md5" "crypto/rsa" "crypto/sha1" + "crypto/sha256" "crypto/x509" "errors" "io" @@ -84,7 +85,7 @@ func (ka rsaKeyAgreement) generateClientKeyExchange(config *Config, clientHello // md5SHA1Hash implements TLS 1.0's hybrid hash function which consists of the // concatenation of an MD5 and SHA1 hash. -func md5SHA1Hash(slices ...[]byte) []byte { +func md5SHA1Hash(slices [][]byte) []byte { md5sha1 := make([]byte, md5.Size+sha1.Size) hmd5 := md5.New() for _, slice := range slices { @@ -100,10 +101,29 @@ func md5SHA1Hash(slices ...[]byte) []byte { return md5sha1 } +// sha256Hash implements TLS 1.2's hash function. +func sha256Hash(slices [][]byte) []byte { + h := sha256.New() + for _, slice := range slices { + h.Write(slice) + } + return h.Sum(nil) +} + +// hashForServerKeyExchange hashes the given slices and returns their digest +// and the identifier of the hash function used. +func hashForServerKeyExchange(version uint16, slices ...[]byte) ([]byte, crypto.Hash) { + if version >= VersionTLS12 { + return sha256Hash(slices), crypto.SHA256 + } + return md5SHA1Hash(slices), crypto.MD5SHA1 +} + // ecdheRSAKeyAgreement implements a TLS key agreement where the server // generates a ephemeral EC public/private key pair and signs it. The // pre-master secret is then calculated using ECDH. type ecdheRSAKeyAgreement struct { + version uint16 privateKey []byte curve elliptic.Curve x, y *big.Int @@ -150,16 +170,25 @@ Curve: serverECDHParams[3] = byte(len(ecdhePublic)) copy(serverECDHParams[4:], ecdhePublic) - md5sha1 := md5SHA1Hash(clientHello.random, hello.random, serverECDHParams) - sig, err := rsa.SignPKCS1v15(config.rand(), cert.PrivateKey.(*rsa.PrivateKey), crypto.MD5SHA1, md5sha1) + digest, hashFunc := hashForServerKeyExchange(ka.version, clientHello.random, hello.random, serverECDHParams) + sig, err := rsa.SignPKCS1v15(config.rand(), cert.PrivateKey.(*rsa.PrivateKey), hashFunc, digest) if err != nil { return nil, errors.New("failed to sign ECDHE parameters: " + err.Error()) } skx := new(serverKeyExchangeMsg) - skx.key = make([]byte, len(serverECDHParams)+2+len(sig)) + sigAndHashLen := 0 + if ka.version >= VersionTLS12 { + sigAndHashLen = 2 + } + skx.key = make([]byte, len(serverECDHParams)+sigAndHashLen+2+len(sig)) copy(skx.key, serverECDHParams) k := skx.key[len(serverECDHParams):] + if ka.version >= VersionTLS12 { + k[0] = hashSHA256 + k[1] = signatureRSA + k = k[2:] + } k[0] = byte(len(sig) >> 8) k[1] = byte(len(sig)) copy(k[2:], sig) @@ -219,14 +248,21 @@ func (ka *ecdheRSAKeyAgreement) processServerKeyExchange(config *Config, clientH if len(sig) < 2 { return errServerKeyExchange } + if ka.version >= VersionTLS12 { + // ignore SignatureAndHashAlgorithm + sig = sig[2:] + if len(sig) < 2 { + return errServerKeyExchange + } + } sigLen := int(sig[0])<<8 | int(sig[1]) if sigLen+2 != len(sig) { return errServerKeyExchange } sig = sig[2:] - md5sha1 := md5SHA1Hash(clientHello.random, serverHello.random, serverECDHParams) - return rsa.VerifyPKCS1v15(cert.PublicKey.(*rsa.PublicKey), crypto.MD5SHA1, md5sha1, sig) + digest, hashFunc := hashForServerKeyExchange(ka.version, clientHello.random, serverHello.random, serverECDHParams) + return rsa.VerifyPKCS1v15(cert.PublicKey.(*rsa.PublicKey), hashFunc, digest, sig) } func (ka *ecdheRSAKeyAgreement) generateClientKeyExchange(config *Config, clientHello *clientHelloMsg, cert *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error) { diff --git a/prf.go b/prf.go index f57b66d..662b2a1 100644 --- a/prf.go +++ b/prf.go @@ -5,9 +5,11 @@ package tls import ( + "crypto" "crypto/hmac" "crypto/md5" "crypto/sha1" + "crypto/sha256" "hash" ) @@ -43,8 +45,8 @@ func pHash(result, secret, seed []byte, hash func() hash.Hash) { } } -// pRF10 implements the TLS 1.0 pseudo-random function, as defined in RFC 2246, section 5. -func pRF10(result, secret, label, seed []byte) { +// prf10 implements the TLS 1.0 pseudo-random function, as defined in RFC 2246, section 5. +func prf10(result, secret, label, seed []byte) { hashSHA1 := sha1.New hashMD5 := md5.New @@ -62,9 +64,18 @@ func pRF10(result, secret, label, seed []byte) { } } -// pRF30 implements the SSL 3.0 pseudo-random function, as defined in +// prf12 implements the TLS 1.2 pseudo-random function, as defined in RFC 5246, section 5. +func prf12(result, secret, label, seed []byte) { + labelAndSeed := make([]byte, len(label)+len(seed)) + copy(labelAndSeed, label) + copy(labelAndSeed[len(label):], seed) + + pHash(result, secret, labelAndSeed, sha256.New) +} + +// prf30 implements the SSL 3.0 pseudo-random function, as defined in // www.mozilla.org/projects/security/pki/nss/ssl/draft302.txt section 6. -func pRF30(result, secret, label, seed []byte) { +func prf30(result, secret, label, seed []byte) { hashSHA1 := sha1.New() hashMD5 := md5.New() @@ -106,19 +117,27 @@ var keyExpansionLabel = []byte("key expansion") var clientFinishedLabel = []byte("client finished") var serverFinishedLabel = []byte("server finished") +func prfForVersion(version uint16) func(result, secret, label, seed []byte) { + switch version { + case VersionSSL30: + return prf30 + case VersionTLS10, VersionTLS11: + return prf10 + case VersionTLS12: + return prf12 + default: + panic("unknown version") + } +} + // masterFromPreMasterSecret generates the master secret from the pre-master // secret. See http://tools.ietf.org/html/rfc5246#section-8.1 func masterFromPreMasterSecret(version uint16, preMasterSecret, clientRandom, serverRandom []byte) []byte { - prf := pRF10 - if version == VersionSSL30 { - prf = pRF30 - } - var seed [tlsRandomLength * 2]byte copy(seed[0:len(clientRandom)], clientRandom) copy(seed[len(clientRandom):], serverRandom) masterSecret := make([]byte, masterSecretLength) - prf(masterSecret, preMasterSecret, masterSecretLabel, seed[0:]) + prfForVersion(version)(masterSecret, preMasterSecret, masterSecretLabel, seed[0:]) return masterSecret } @@ -126,18 +145,13 @@ func masterFromPreMasterSecret(version uint16, preMasterSecret, clientRandom, se // secret, given the lengths of the MAC key, cipher key and IV, as defined in // RFC 2246, section 6.3. func keysFromMasterSecret(version uint16, masterSecret, clientRandom, serverRandom []byte, macLen, keyLen, ivLen int) (clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV []byte) { - prf := pRF10 - if version == VersionSSL30 { - prf = pRF30 - } - var seed [tlsRandomLength * 2]byte copy(seed[0:len(clientRandom)], serverRandom) copy(seed[len(serverRandom):], clientRandom) n := 2*macLen + 2*keyLen + 2*ivLen keyMaterial := make([]byte, n) - prf(keyMaterial, masterSecret, keyExpansionLabel, seed[0:]) + prfForVersion(version)(keyMaterial, masterSecret, keyExpansionLabel, seed[0:]) clientMAC = keyMaterial[:macLen] keyMaterial = keyMaterial[macLen:] serverMAC = keyMaterial[:macLen] @@ -153,37 +167,34 @@ func keysFromMasterSecret(version uint16, masterSecret, clientRandom, serverRand } func newFinishedHash(version uint16) finishedHash { - return finishedHash{md5.New(), sha1.New(), md5.New(), sha1.New(), version} + if version >= VersionTLS12 { + return finishedHash{sha256.New(), sha256.New(), nil, nil, version} + } + return finishedHash{sha1.New(), sha1.New(), md5.New(), md5.New(), version} } // A finishedHash calculates the hash of a set of handshake messages suitable // for including in a Finished message. type finishedHash struct { - clientMD5 hash.Hash - clientSHA1 hash.Hash - serverMD5 hash.Hash - serverSHA1 hash.Hash - version uint16 + client hash.Hash + server hash.Hash + + // Prior to TLS 1.2, an additional MD5 hash is required. + clientMD5 hash.Hash + serverMD5 hash.Hash + + version uint16 } func (h finishedHash) Write(msg []byte) (n int, err error) { - h.clientMD5.Write(msg) - h.clientSHA1.Write(msg) - h.serverMD5.Write(msg) - h.serverSHA1.Write(msg) - return len(msg), nil -} + h.client.Write(msg) + h.server.Write(msg) -// finishedSum10 calculates the contents of the verify_data member of a TLSv1 -// Finished message given the MD5 and SHA1 hashes of a set of handshake -// messages. -func finishedSum10(md5, sha1, label, masterSecret []byte) []byte { - seed := make([]byte, len(md5)+len(sha1)) - copy(seed, md5) - copy(seed[len(md5):], sha1) - out := make([]byte, finishedVerifyLength) - pRF10(out, masterSecret, label, seed) - return out + if h.version < VersionTLS12 { + h.clientMD5.Write(msg) + h.serverMD5.Write(msg) + } + return len(msg), nil } // finishedSum30 calculates the contents of the verify_data member of a SSLv3 @@ -225,22 +236,52 @@ var ssl3ServerFinishedMagic = [4]byte{0x53, 0x52, 0x56, 0x52} // Finished message. func (h finishedHash) clientSum(masterSecret []byte) []byte { if h.version == VersionSSL30 { - return finishedSum30(h.clientMD5, h.clientSHA1, masterSecret, ssl3ClientFinishedMagic) + return finishedSum30(h.clientMD5, h.client, masterSecret, ssl3ClientFinishedMagic) } - md5 := h.clientMD5.Sum(nil) - sha1 := h.clientSHA1.Sum(nil) - return finishedSum10(md5, sha1, clientFinishedLabel, masterSecret) + out := make([]byte, finishedVerifyLength) + if h.version >= VersionTLS12 { + seed := h.client.Sum(nil) + prf12(out, masterSecret, clientFinishedLabel, seed) + } else { + seed := make([]byte, 0, md5.Size+sha1.Size) + seed = h.clientMD5.Sum(seed) + seed = h.client.Sum(seed) + prf10(out, masterSecret, clientFinishedLabel, seed) + } + return out } // serverSum returns the contents of the verify_data member of a server's // Finished message. func (h finishedHash) serverSum(masterSecret []byte) []byte { if h.version == VersionSSL30 { - return finishedSum30(h.serverMD5, h.serverSHA1, masterSecret, ssl3ServerFinishedMagic) + return finishedSum30(h.serverMD5, h.server, masterSecret, ssl3ServerFinishedMagic) } - md5 := h.serverMD5.Sum(nil) - sha1 := h.serverSHA1.Sum(nil) - return finishedSum10(md5, sha1, serverFinishedLabel, masterSecret) + out := make([]byte, finishedVerifyLength) + if h.version >= VersionTLS12 { + seed := h.server.Sum(nil) + prf12(out, masterSecret, serverFinishedLabel, seed) + } else { + seed := make([]byte, 0, md5.Size+sha1.Size) + seed = h.serverMD5.Sum(seed) + seed = h.server.Sum(seed) + prf10(out, masterSecret, serverFinishedLabel, seed) + } + return out +} + +// hashForClientCertificate returns a digest and hash function identifier +// suitable for signing by a TLS client certificate. +func (h finishedHash) hashForClientCertificate() ([]byte, crypto.Hash) { + if h.version >= VersionTLS12 { + digest := h.server.Sum(nil) + return digest, crypto.SHA256 + } + + digest := make([]byte, 0, 36) + digest = h.serverMD5.Sum(digest) + digest = h.server.Sum(digest) + return digest, crypto.MD5SHA1 }