mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 21:49:33 +00:00
290 lines
10 KiB
Go
290 lines
10 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package tls
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/des"
|
|
"crypto/hmac"
|
|
"crypto/rc4"
|
|
"crypto/sha1"
|
|
"crypto/x509"
|
|
"hash"
|
|
)
|
|
|
|
// a keyAgreement implements the client and server side of a TLS key agreement
|
|
// protocol by generating and processing key exchange messages.
|
|
type keyAgreement interface {
|
|
// On the server side, the first two methods are called in order.
|
|
|
|
// In the case that the key agreement protocol doesn't use a
|
|
// ServerKeyExchange message, generateServerKeyExchange can return nil,
|
|
// nil.
|
|
generateServerKeyExchange(*Config, *Certificate, *clientHelloMsg, *serverHelloMsg) (*serverKeyExchangeMsg, error)
|
|
processClientKeyExchange(*Config, *Certificate, *clientKeyExchangeMsg, uint16) ([]byte, error)
|
|
|
|
// On the client side, the next two methods are called in order.
|
|
|
|
// This method may not be called if the server doesn't send a
|
|
// ServerKeyExchange message.
|
|
processServerKeyExchange(*Config, *clientHelloMsg, *serverHelloMsg, *x509.Certificate, *serverKeyExchangeMsg) error
|
|
generateClientKeyExchange(*Config, *clientHelloMsg, *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error)
|
|
}
|
|
|
|
const (
|
|
// suiteECDH indicates that the cipher suite involves elliptic curve
|
|
// Diffie-Hellman. This means that it should only be selected when the
|
|
// client indicates that it supports ECC with a curve and point format
|
|
// that we're happy with.
|
|
suiteECDHE = 1 << iota
|
|
// suiteECDSA indicates that the cipher suite involves an ECDSA
|
|
// signature and therefore may only be selected when the server's
|
|
// certificate is ECDSA. If this is not set then the cipher suite is
|
|
// RSA based.
|
|
suiteECDSA
|
|
// suiteTLS12 indicates that the cipher suite should only be advertised
|
|
// and accepted when using TLS 1.2.
|
|
suiteTLS12
|
|
// suiteSHA384 indicates that the cipher suite uses SHA384 as the
|
|
// handshake hash.
|
|
suiteSHA384
|
|
// suiteDefaultOff indicates that this cipher suite is not included by
|
|
// default.
|
|
suiteDefaultOff
|
|
)
|
|
|
|
// A cipherSuite is a specific combination of key agreement, cipher and MAC
|
|
// function. All cipher suites currently assume RSA key agreement.
|
|
type cipherSuite struct {
|
|
id uint16
|
|
// the lengths, in bytes, of the key material needed for each component.
|
|
keyLen int
|
|
macLen int
|
|
ivLen int
|
|
ka func(version uint16) keyAgreement
|
|
// flags is a bitmask of the suite* values, above.
|
|
flags int
|
|
cipher func(key, iv []byte, isRead bool) interface{}
|
|
mac func(version uint16, macKey []byte) macFunction
|
|
aead func(key, fixedNonce []byte) cipher.AEAD
|
|
}
|
|
|
|
var cipherSuites = []*cipherSuite{
|
|
// Ciphersuite order is chosen so that ECDHE comes before plain RSA
|
|
// and RC4 comes before AES (because of the Lucky13 attack).
|
|
{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM},
|
|
{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteTLS12, nil, nil, aeadAESGCM},
|
|
{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
|
|
{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
|
|
{TLS_ECDHE_RSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheRSAKA, suiteECDHE | suiteDefaultOff, cipherRC4, macSHA1, nil},
|
|
{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteDefaultOff, cipherRC4, macSHA1, nil},
|
|
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
|
|
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil},
|
|
{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
|
|
{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil},
|
|
{TLS_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, rsaKA, suiteTLS12, nil, nil, aeadAESGCM},
|
|
{TLS_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, rsaKA, suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
|
|
{TLS_RSA_WITH_RC4_128_SHA, 16, 20, 0, rsaKA, suiteDefaultOff, cipherRC4, macSHA1, nil},
|
|
{TLS_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
|
|
{TLS_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
|
|
{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil},
|
|
{TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil},
|
|
}
|
|
|
|
func cipherRC4(key, iv []byte, isRead bool) interface{} {
|
|
cipher, _ := rc4.NewCipher(key)
|
|
return cipher
|
|
}
|
|
|
|
func cipher3DES(key, iv []byte, isRead bool) interface{} {
|
|
block, _ := des.NewTripleDESCipher(key)
|
|
if isRead {
|
|
return cipher.NewCBCDecrypter(block, iv)
|
|
}
|
|
return cipher.NewCBCEncrypter(block, iv)
|
|
}
|
|
|
|
func cipherAES(key, iv []byte, isRead bool) interface{} {
|
|
block, _ := aes.NewCipher(key)
|
|
if isRead {
|
|
return cipher.NewCBCDecrypter(block, iv)
|
|
}
|
|
return cipher.NewCBCEncrypter(block, iv)
|
|
}
|
|
|
|
// macSHA1 returns a macFunction for the given protocol version.
|
|
func macSHA1(version uint16, key []byte) macFunction {
|
|
if version == VersionSSL30 {
|
|
mac := ssl30MAC{
|
|
h: sha1.New(),
|
|
key: make([]byte, len(key)),
|
|
}
|
|
copy(mac.key, key)
|
|
return mac
|
|
}
|
|
return tls10MAC{hmac.New(sha1.New, key)}
|
|
}
|
|
|
|
type macFunction interface {
|
|
Size() int
|
|
MAC(digestBuf, seq, header, data []byte) []byte
|
|
}
|
|
|
|
// fixedNonceAEAD wraps an AEAD and prefixes a fixed portion of the nonce to
|
|
// each call.
|
|
type fixedNonceAEAD struct {
|
|
// sealNonce and openNonce are buffers where the larger nonce will be
|
|
// constructed. Since a seal and open operation may be running
|
|
// concurrently, there is a separate buffer for each.
|
|
sealNonce, openNonce []byte
|
|
aead cipher.AEAD
|
|
}
|
|
|
|
func (f *fixedNonceAEAD) NonceSize() int { return 8 }
|
|
func (f *fixedNonceAEAD) Overhead() int { return f.aead.Overhead() }
|
|
|
|
func (f *fixedNonceAEAD) Seal(out, nonce, plaintext, additionalData []byte) []byte {
|
|
copy(f.sealNonce[len(f.sealNonce)-8:], nonce)
|
|
return f.aead.Seal(out, f.sealNonce, plaintext, additionalData)
|
|
}
|
|
|
|
func (f *fixedNonceAEAD) Open(out, nonce, plaintext, additionalData []byte) ([]byte, error) {
|
|
copy(f.openNonce[len(f.openNonce)-8:], nonce)
|
|
return f.aead.Open(out, f.openNonce, plaintext, additionalData)
|
|
}
|
|
|
|
func aeadAESGCM(key, fixedNonce []byte) cipher.AEAD {
|
|
aes, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
aead, err := cipher.NewGCM(aes)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
nonce1, nonce2 := make([]byte, 12), make([]byte, 12)
|
|
copy(nonce1, fixedNonce)
|
|
copy(nonce2, fixedNonce)
|
|
|
|
return &fixedNonceAEAD{nonce1, nonce2, aead}
|
|
}
|
|
|
|
// ssl30MAC implements the SSLv3 MAC function, as defined in
|
|
// www.mozilla.org/projects/security/pki/nss/ssl/draft302.txt section 5.2.3.1
|
|
type ssl30MAC struct {
|
|
h hash.Hash
|
|
key []byte
|
|
}
|
|
|
|
func (s ssl30MAC) Size() int {
|
|
return s.h.Size()
|
|
}
|
|
|
|
var ssl30Pad1 = [48]byte{0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36}
|
|
|
|
var ssl30Pad2 = [48]byte{0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c}
|
|
|
|
func (s ssl30MAC) MAC(digestBuf, seq, header, data []byte) []byte {
|
|
padLength := 48
|
|
if s.h.Size() == 20 {
|
|
padLength = 40
|
|
}
|
|
|
|
s.h.Reset()
|
|
s.h.Write(s.key)
|
|
s.h.Write(ssl30Pad1[:padLength])
|
|
s.h.Write(seq)
|
|
s.h.Write(header[:1])
|
|
s.h.Write(header[3:5])
|
|
s.h.Write(data)
|
|
digestBuf = s.h.Sum(digestBuf[:0])
|
|
|
|
s.h.Reset()
|
|
s.h.Write(s.key)
|
|
s.h.Write(ssl30Pad2[:padLength])
|
|
s.h.Write(digestBuf)
|
|
return s.h.Sum(digestBuf[:0])
|
|
}
|
|
|
|
// tls10MAC implements the TLS 1.0 MAC function. RFC 2246, section 6.2.3.
|
|
type tls10MAC struct {
|
|
h hash.Hash
|
|
}
|
|
|
|
func (s tls10MAC) Size() int {
|
|
return s.h.Size()
|
|
}
|
|
|
|
func (s tls10MAC) MAC(digestBuf, seq, header, data []byte) []byte {
|
|
s.h.Reset()
|
|
s.h.Write(seq)
|
|
s.h.Write(header)
|
|
s.h.Write(data)
|
|
return s.h.Sum(digestBuf[:0])
|
|
}
|
|
|
|
func rsaKA(version uint16) keyAgreement {
|
|
return rsaKeyAgreement{}
|
|
}
|
|
|
|
func ecdheECDSAKA(version uint16) keyAgreement {
|
|
return &ecdheKeyAgreement{
|
|
sigType: signatureECDSA,
|
|
version: version,
|
|
}
|
|
}
|
|
|
|
func ecdheRSAKA(version uint16) keyAgreement {
|
|
return &ecdheKeyAgreement{
|
|
sigType: signatureRSA,
|
|
version: version,
|
|
}
|
|
}
|
|
|
|
// mutualCipherSuite returns a cipherSuite given a list of supported
|
|
// ciphersuites and the id requested by the peer.
|
|
func mutualCipherSuite(have []uint16, want uint16) *cipherSuite {
|
|
for _, id := range have {
|
|
if id == want {
|
|
for _, suite := range cipherSuites {
|
|
if suite.id == want {
|
|
return suite
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// A list of the possible cipher suite ids. Taken from
|
|
// http://www.iana.org/assignments/tls-parameters/tls-parameters.xml
|
|
const (
|
|
TLS_RSA_WITH_RC4_128_SHA uint16 = 0x0005
|
|
TLS_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0x000a
|
|
TLS_RSA_WITH_AES_128_CBC_SHA uint16 = 0x002f
|
|
TLS_RSA_WITH_AES_256_CBC_SHA uint16 = 0x0035
|
|
TLS_RSA_WITH_AES_128_GCM_SHA256 uint16 = 0x009c
|
|
TLS_RSA_WITH_AES_256_GCM_SHA384 uint16 = 0x009d
|
|
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA uint16 = 0xc007
|
|
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA uint16 = 0xc009
|
|
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA uint16 = 0xc00a
|
|
TLS_ECDHE_RSA_WITH_RC4_128_SHA uint16 = 0xc011
|
|
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0xc012
|
|
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA uint16 = 0xc013
|
|
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA uint16 = 0xc014
|
|
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02f
|
|
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02b
|
|
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 uint16 = 0xc030
|
|
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 uint16 = 0xc02c
|
|
|
|
// TLS_FALLBACK_SCSV isn't a standard cipher suite but an indicator
|
|
// that the client is doing version fallback. See
|
|
// https://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00.
|
|
TLS_FALLBACK_SCSV uint16 = 0x5600
|
|
)
|