mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-22 18:17:52 -05:00
822 lines
22 KiB
Go
822 lines
22 KiB
Go
// Copyright 2009 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"
|
|
"crypto/ecdsa"
|
|
"crypto/rsa"
|
|
"crypto/subtle"
|
|
"crypto/x509"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"sync/atomic"
|
|
)
|
|
|
|
// serverHandshakeState contains details of a server handshake in progress.
|
|
// It's discarded once the handshake has completed.
|
|
type serverHandshakeState struct {
|
|
c *Conn
|
|
clientHello *clientHelloMsg
|
|
hello *serverHelloMsg
|
|
suite *cipherSuite
|
|
ellipticOk bool
|
|
ecdsaOk bool
|
|
rsaDecryptOk bool
|
|
rsaSignOk bool
|
|
sessionState *sessionState
|
|
finishedHash finishedHash
|
|
masterSecret []byte
|
|
cert *Certificate
|
|
}
|
|
|
|
// serverHandshake performs a TLS handshake as a server.
|
|
func (c *Conn) serverHandshake() error {
|
|
// If this is the first server handshake, we generate a random key to
|
|
// encrypt the tickets with.
|
|
c.config.serverInitOnce.Do(func() { c.config.serverInit(nil) })
|
|
|
|
clientHello, err := c.readClientHello()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if c.vers == VersionTLS13 {
|
|
hs := serverHandshakeStateTLS13{
|
|
c: c,
|
|
clientHello: clientHello,
|
|
}
|
|
return hs.handshake()
|
|
}
|
|
|
|
hs := serverHandshakeState{
|
|
c: c,
|
|
clientHello: clientHello,
|
|
}
|
|
return hs.handshake()
|
|
}
|
|
|
|
func (hs *serverHandshakeState) handshake() error {
|
|
c := hs.c
|
|
|
|
if err := hs.processClientHello(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// For an overview of TLS handshaking, see RFC 5246, Section 7.3.
|
|
c.buffering = true
|
|
if hs.checkForResumption() {
|
|
// The client has included a session ticket and so we do an abbreviated handshake.
|
|
if err := hs.doResumeHandshake(); err != nil {
|
|
return err
|
|
}
|
|
if err := hs.establishKeys(); err != nil {
|
|
return err
|
|
}
|
|
// ticketSupported is set in a resumption handshake if the
|
|
// ticket from the client was encrypted with an old session
|
|
// ticket key and thus a refreshed ticket should be sent.
|
|
if hs.hello.ticketSupported {
|
|
if err := hs.sendSessionTicket(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if err := hs.sendFinished(c.serverFinished[:]); err != nil {
|
|
return err
|
|
}
|
|
if _, err := c.flush(); err != nil {
|
|
return err
|
|
}
|
|
c.clientFinishedIsFirst = false
|
|
if err := hs.readFinished(nil); err != nil {
|
|
return err
|
|
}
|
|
c.didResume = true
|
|
} else {
|
|
// The client didn't include a session ticket, or it wasn't
|
|
// valid so we do a full handshake.
|
|
if err := hs.pickCipherSuite(); err != nil {
|
|
return err
|
|
}
|
|
if err := hs.doFullHandshake(); err != nil {
|
|
return err
|
|
}
|
|
if err := hs.establishKeys(); err != nil {
|
|
return err
|
|
}
|
|
if err := hs.readFinished(c.clientFinished[:]); err != nil {
|
|
return err
|
|
}
|
|
c.clientFinishedIsFirst = true
|
|
c.buffering = true
|
|
if err := hs.sendSessionTicket(); err != nil {
|
|
return err
|
|
}
|
|
if err := hs.sendFinished(nil); err != nil {
|
|
return err
|
|
}
|
|
if _, err := c.flush(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
c.ekm = ekmFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.clientHello.random, hs.hello.random)
|
|
atomic.StoreUint32(&c.handshakeStatus, 1)
|
|
|
|
return nil
|
|
}
|
|
|
|
// readClientHello reads a ClientHello message and selects the protocol version.
|
|
func (c *Conn) readClientHello() (*clientHelloMsg, error) {
|
|
msg, err := c.readHandshake()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
clientHello, ok := msg.(*clientHelloMsg)
|
|
if !ok {
|
|
c.sendAlert(alertUnexpectedMessage)
|
|
return nil, unexpectedMessageError(clientHello, msg)
|
|
}
|
|
|
|
if c.config.GetConfigForClient != nil {
|
|
chi := clientHelloInfo(c, clientHello)
|
|
if newConfig, err := c.config.GetConfigForClient(chi); err != nil {
|
|
c.sendAlert(alertInternalError)
|
|
return nil, err
|
|
} else if newConfig != nil {
|
|
newConfig.serverInitOnce.Do(func() { newConfig.serverInit(c.config) })
|
|
c.config = newConfig
|
|
}
|
|
}
|
|
|
|
clientVersions := clientHello.supportedVersions
|
|
if len(clientHello.supportedVersions) == 0 {
|
|
clientVersions = supportedVersionsFromMax(clientHello.vers)
|
|
}
|
|
c.vers, ok = c.config.mutualVersion(false, clientVersions)
|
|
if !ok {
|
|
c.sendAlert(alertProtocolVersion)
|
|
return nil, fmt.Errorf("tls: client offered only unsupported versions: %x", clientVersions)
|
|
}
|
|
c.haveVers = true
|
|
c.in.version = c.vers
|
|
c.out.version = c.vers
|
|
|
|
return clientHello, nil
|
|
}
|
|
|
|
func (hs *serverHandshakeState) processClientHello() error {
|
|
c := hs.c
|
|
|
|
hs.hello = new(serverHelloMsg)
|
|
hs.hello.vers = c.vers
|
|
|
|
supportedCurve := false
|
|
preferredCurves := c.config.curvePreferences()
|
|
Curves:
|
|
for _, curve := range hs.clientHello.supportedCurves {
|
|
for _, supported := range preferredCurves {
|
|
if supported == curve {
|
|
supportedCurve = true
|
|
break Curves
|
|
}
|
|
}
|
|
}
|
|
|
|
supportedPointFormat := false
|
|
for _, pointFormat := range hs.clientHello.supportedPoints {
|
|
if pointFormat == pointFormatUncompressed {
|
|
supportedPointFormat = true
|
|
break
|
|
}
|
|
}
|
|
hs.ellipticOk = supportedCurve && supportedPointFormat
|
|
|
|
foundCompression := false
|
|
// We only support null compression, so check that the client offered it.
|
|
for _, compression := range hs.clientHello.compressionMethods {
|
|
if compression == compressionNone {
|
|
foundCompression = true
|
|
break
|
|
}
|
|
}
|
|
|
|
if !foundCompression {
|
|
c.sendAlert(alertHandshakeFailure)
|
|
return errors.New("tls: client does not support uncompressed connections")
|
|
}
|
|
|
|
hs.hello.random = make([]byte, 32)
|
|
serverRandom := hs.hello.random
|
|
// Downgrade protection canaries. See RFC 8446, Section 4.1.3.
|
|
maxVers := c.config.maxSupportedVersion(false)
|
|
if maxVers >= VersionTLS12 && c.vers < maxVers {
|
|
if c.vers == VersionTLS12 {
|
|
copy(serverRandom[24:], downgradeCanaryTLS12)
|
|
} else {
|
|
copy(serverRandom[24:], downgradeCanaryTLS11)
|
|
}
|
|
serverRandom = serverRandom[:24]
|
|
}
|
|
_, err := io.ReadFull(c.config.rand(), serverRandom)
|
|
if err != nil {
|
|
c.sendAlert(alertInternalError)
|
|
return err
|
|
}
|
|
|
|
if len(hs.clientHello.secureRenegotiation) != 0 {
|
|
c.sendAlert(alertHandshakeFailure)
|
|
return errors.New("tls: initial handshake had non-empty renegotiation extension")
|
|
}
|
|
|
|
hs.hello.secureRenegotiationSupported = hs.clientHello.secureRenegotiationSupported
|
|
hs.hello.compressionMethod = compressionNone
|
|
if len(hs.clientHello.serverName) > 0 {
|
|
c.serverName = hs.clientHello.serverName
|
|
}
|
|
|
|
if len(hs.clientHello.alpnProtocols) > 0 {
|
|
if selectedProto, fallback := mutualProtocol(hs.clientHello.alpnProtocols, c.config.NextProtos); !fallback {
|
|
hs.hello.alpnProtocol = selectedProto
|
|
c.clientProtocol = selectedProto
|
|
}
|
|
} else {
|
|
// Although sending an empty NPN extension is reasonable, Firefox has
|
|
// had a bug around this. Best to send nothing at all if
|
|
// c.config.NextProtos is empty. See
|
|
// https://golang.org/issue/5445.
|
|
if hs.clientHello.nextProtoNeg && len(c.config.NextProtos) > 0 {
|
|
hs.hello.nextProtoNeg = true
|
|
hs.hello.nextProtos = c.config.NextProtos
|
|
}
|
|
}
|
|
|
|
hs.cert, err = c.config.getCertificate(clientHelloInfo(c, hs.clientHello))
|
|
if err != nil {
|
|
c.sendAlert(alertInternalError)
|
|
return err
|
|
}
|
|
if hs.clientHello.scts {
|
|
hs.hello.scts = hs.cert.SignedCertificateTimestamps
|
|
}
|
|
|
|
if priv, ok := hs.cert.PrivateKey.(crypto.Signer); ok {
|
|
switch priv.Public().(type) {
|
|
case *ecdsa.PublicKey:
|
|
hs.ecdsaOk = true
|
|
case *rsa.PublicKey:
|
|
hs.rsaSignOk = true
|
|
default:
|
|
c.sendAlert(alertInternalError)
|
|
return fmt.Errorf("tls: unsupported signing key type (%T)", priv.Public())
|
|
}
|
|
}
|
|
if priv, ok := hs.cert.PrivateKey.(crypto.Decrypter); ok {
|
|
switch priv.Public().(type) {
|
|
case *rsa.PublicKey:
|
|
hs.rsaDecryptOk = true
|
|
default:
|
|
c.sendAlert(alertInternalError)
|
|
return fmt.Errorf("tls: unsupported decryption key type (%T)", priv.Public())
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (hs *serverHandshakeState) pickCipherSuite() error {
|
|
c := hs.c
|
|
|
|
var preferenceList, supportedList []uint16
|
|
if c.config.PreferServerCipherSuites {
|
|
preferenceList = c.config.cipherSuites()
|
|
supportedList = hs.clientHello.cipherSuites
|
|
} else {
|
|
preferenceList = hs.clientHello.cipherSuites
|
|
supportedList = c.config.cipherSuites()
|
|
}
|
|
|
|
for _, id := range preferenceList {
|
|
if hs.setCipherSuite(id, supportedList, c.vers) {
|
|
break
|
|
}
|
|
}
|
|
|
|
if hs.suite == nil {
|
|
c.sendAlert(alertHandshakeFailure)
|
|
return errors.New("tls: no cipher suite supported by both client and server")
|
|
}
|
|
|
|
for _, id := range hs.clientHello.cipherSuites {
|
|
if id == TLS_FALLBACK_SCSV {
|
|
// The client is doing a fallback connection. See RFC 7507.
|
|
if hs.clientHello.vers < c.config.maxSupportedVersion(false) {
|
|
c.sendAlert(alertInappropriateFallback)
|
|
return errors.New("tls: client using inappropriate protocol fallback")
|
|
}
|
|
break
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// checkForResumption reports whether we should perform resumption on this connection.
|
|
func (hs *serverHandshakeState) checkForResumption() bool {
|
|
c := hs.c
|
|
|
|
if c.config.SessionTicketsDisabled {
|
|
return false
|
|
}
|
|
|
|
plaintext, usedOldKey := c.decryptTicket(hs.clientHello.sessionTicket)
|
|
if plaintext == nil {
|
|
return false
|
|
}
|
|
hs.sessionState = &sessionState{usedOldKey: usedOldKey}
|
|
ok := hs.sessionState.unmarshal(plaintext)
|
|
if !ok {
|
|
return false
|
|
}
|
|
|
|
// Never resume a session for a different TLS version.
|
|
if c.vers != hs.sessionState.vers {
|
|
return false
|
|
}
|
|
|
|
cipherSuiteOk := false
|
|
// Check that the client is still offering the ciphersuite in the session.
|
|
for _, id := range hs.clientHello.cipherSuites {
|
|
if id == hs.sessionState.cipherSuite {
|
|
cipherSuiteOk = true
|
|
break
|
|
}
|
|
}
|
|
if !cipherSuiteOk {
|
|
return false
|
|
}
|
|
|
|
// Check that we also support the ciphersuite from the session.
|
|
if !hs.setCipherSuite(hs.sessionState.cipherSuite, c.config.cipherSuites(), hs.sessionState.vers) {
|
|
return false
|
|
}
|
|
|
|
sessionHasClientCerts := len(hs.sessionState.certificates) != 0
|
|
needClientCerts := requiresClientCert(c.config.ClientAuth)
|
|
if needClientCerts && !sessionHasClientCerts {
|
|
return false
|
|
}
|
|
if sessionHasClientCerts && c.config.ClientAuth == NoClientCert {
|
|
return false
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (hs *serverHandshakeState) doResumeHandshake() error {
|
|
c := hs.c
|
|
|
|
hs.hello.cipherSuite = hs.suite.id
|
|
// We echo the client's session ID in the ServerHello to let it know
|
|
// that we're doing a resumption.
|
|
hs.hello.sessionId = hs.clientHello.sessionId
|
|
hs.hello.ticketSupported = hs.sessionState.usedOldKey
|
|
hs.finishedHash = newFinishedHash(c.vers, hs.suite)
|
|
hs.finishedHash.discardHandshakeBuffer()
|
|
hs.finishedHash.Write(hs.clientHello.marshal())
|
|
hs.finishedHash.Write(hs.hello.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := c.processCertsFromClient(Certificate{
|
|
Certificate: hs.sessionState.certificates,
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
|
|
hs.masterSecret = hs.sessionState.masterSecret
|
|
|
|
return nil
|
|
}
|
|
|
|
func (hs *serverHandshakeState) doFullHandshake() error {
|
|
c := hs.c
|
|
|
|
if hs.clientHello.ocspStapling && len(hs.cert.OCSPStaple) > 0 {
|
|
hs.hello.ocspStapling = true
|
|
}
|
|
|
|
hs.hello.ticketSupported = hs.clientHello.ticketSupported && !c.config.SessionTicketsDisabled
|
|
hs.hello.cipherSuite = hs.suite.id
|
|
|
|
hs.finishedHash = newFinishedHash(hs.c.vers, hs.suite)
|
|
if c.config.ClientAuth == NoClientCert {
|
|
// No need to keep a full record of the handshake if client
|
|
// certificates won't be used.
|
|
hs.finishedHash.discardHandshakeBuffer()
|
|
}
|
|
hs.finishedHash.Write(hs.clientHello.marshal())
|
|
hs.finishedHash.Write(hs.hello.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
|
|
return err
|
|
}
|
|
|
|
certMsg := new(certificateMsg)
|
|
certMsg.certificates = hs.cert.Certificate
|
|
hs.finishedHash.Write(certMsg.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, certMsg.marshal()); err != nil {
|
|
return err
|
|
}
|
|
|
|
if hs.hello.ocspStapling {
|
|
certStatus := new(certificateStatusMsg)
|
|
certStatus.response = hs.cert.OCSPStaple
|
|
hs.finishedHash.Write(certStatus.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, certStatus.marshal()); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
keyAgreement := hs.suite.ka(c.vers)
|
|
skx, err := keyAgreement.generateServerKeyExchange(c.config, hs.cert, hs.clientHello, hs.hello)
|
|
if err != nil {
|
|
c.sendAlert(alertHandshakeFailure)
|
|
return err
|
|
}
|
|
if skx != nil {
|
|
hs.finishedHash.Write(skx.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, skx.marshal()); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if c.config.ClientAuth >= RequestClientCert {
|
|
// Request a client certificate
|
|
certReq := new(certificateRequestMsg)
|
|
certReq.certificateTypes = []byte{
|
|
byte(certTypeRSASign),
|
|
byte(certTypeECDSASign),
|
|
}
|
|
if c.vers >= VersionTLS12 {
|
|
certReq.hasSignatureAlgorithm = true
|
|
certReq.supportedSignatureAlgorithms = supportedSignatureAlgorithms
|
|
}
|
|
|
|
// An empty list of certificateAuthorities signals to
|
|
// the client that it may send any certificate in response
|
|
// to our request. When we know the CAs we trust, then
|
|
// we can send them down, so that the client can choose
|
|
// an appropriate certificate to give to us.
|
|
if c.config.ClientCAs != nil {
|
|
certReq.certificateAuthorities = c.config.ClientCAs.Subjects()
|
|
}
|
|
hs.finishedHash.Write(certReq.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, certReq.marshal()); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
helloDone := new(serverHelloDoneMsg)
|
|
hs.finishedHash.Write(helloDone.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, helloDone.marshal()); err != nil {
|
|
return err
|
|
}
|
|
|
|
if _, err := c.flush(); err != nil {
|
|
return err
|
|
}
|
|
|
|
var pub crypto.PublicKey // public key for client auth, if any
|
|
|
|
msg, err := c.readHandshake()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// If we requested a client certificate, then the client must send a
|
|
// certificate message, even if it's empty.
|
|
if c.config.ClientAuth >= RequestClientCert {
|
|
certMsg, ok := msg.(*certificateMsg)
|
|
if !ok {
|
|
c.sendAlert(alertUnexpectedMessage)
|
|
return unexpectedMessageError(certMsg, msg)
|
|
}
|
|
hs.finishedHash.Write(certMsg.marshal())
|
|
|
|
if err := c.processCertsFromClient(Certificate{
|
|
Certificate: certMsg.certificates,
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
if len(certMsg.certificates) != 0 {
|
|
pub = c.peerCertificates[0].PublicKey
|
|
}
|
|
|
|
msg, err = c.readHandshake()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Get client key exchange
|
|
ckx, ok := msg.(*clientKeyExchangeMsg)
|
|
if !ok {
|
|
c.sendAlert(alertUnexpectedMessage)
|
|
return unexpectedMessageError(ckx, msg)
|
|
}
|
|
hs.finishedHash.Write(ckx.marshal())
|
|
|
|
preMasterSecret, err := keyAgreement.processClientKeyExchange(c.config, hs.cert, ckx, c.vers)
|
|
if err != nil {
|
|
c.sendAlert(alertHandshakeFailure)
|
|
return err
|
|
}
|
|
hs.masterSecret = masterFromPreMasterSecret(c.vers, hs.suite, preMasterSecret, hs.clientHello.random, hs.hello.random)
|
|
if err := c.config.writeKeyLog(keyLogLabelTLS12, hs.clientHello.random, hs.masterSecret); err != nil {
|
|
c.sendAlert(alertInternalError)
|
|
return err
|
|
}
|
|
|
|
// If we received a client cert in response to our certificate request message,
|
|
// the client will send us a certificateVerifyMsg immediately after the
|
|
// clientKeyExchangeMsg. This message is a digest of all preceding
|
|
// handshake-layer messages that is signed using the private key corresponding
|
|
// to the client's certificate. This allows us to verify that the client is in
|
|
// possession of the private key of the certificate.
|
|
if len(c.peerCertificates) > 0 {
|
|
msg, err = c.readHandshake()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
certVerify, ok := msg.(*certificateVerifyMsg)
|
|
if !ok {
|
|
c.sendAlert(alertUnexpectedMessage)
|
|
return unexpectedMessageError(certVerify, msg)
|
|
}
|
|
|
|
// Determine the signature type.
|
|
_, sigType, hashFunc, err := pickSignatureAlgorithm(pub, []SignatureScheme{certVerify.signatureAlgorithm}, supportedSignatureAlgorithms, c.vers)
|
|
if err != nil {
|
|
c.sendAlert(alertIllegalParameter)
|
|
return err
|
|
}
|
|
|
|
var digest []byte
|
|
if digest, err = hs.finishedHash.hashForClientCertificate(sigType, hashFunc, hs.masterSecret); err == nil {
|
|
err = verifyHandshakeSignature(sigType, pub, hashFunc, digest, certVerify.signature)
|
|
}
|
|
if err != nil {
|
|
c.sendAlert(alertBadCertificate)
|
|
return errors.New("tls: could not validate signature of connection nonces: " + err.Error())
|
|
}
|
|
|
|
hs.finishedHash.Write(certVerify.marshal())
|
|
}
|
|
|
|
hs.finishedHash.discardHandshakeBuffer()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (hs *serverHandshakeState) establishKeys() error {
|
|
c := hs.c
|
|
|
|
clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV :=
|
|
keysFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.clientHello.random, hs.hello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
|
|
|
|
var clientCipher, serverCipher interface{}
|
|
var clientHash, serverHash macFunction
|
|
|
|
if hs.suite.aead == nil {
|
|
clientCipher = hs.suite.cipher(clientKey, clientIV, true /* for reading */)
|
|
clientHash = hs.suite.mac(c.vers, clientMAC)
|
|
serverCipher = hs.suite.cipher(serverKey, serverIV, false /* not for reading */)
|
|
serverHash = hs.suite.mac(c.vers, serverMAC)
|
|
} else {
|
|
clientCipher = hs.suite.aead(clientKey, clientIV)
|
|
serverCipher = hs.suite.aead(serverKey, serverIV)
|
|
}
|
|
|
|
c.in.prepareCipherSpec(c.vers, clientCipher, clientHash)
|
|
c.out.prepareCipherSpec(c.vers, serverCipher, serverHash)
|
|
|
|
return nil
|
|
}
|
|
|
|
func (hs *serverHandshakeState) readFinished(out []byte) error {
|
|
c := hs.c
|
|
|
|
if err := c.readChangeCipherSpec(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if hs.hello.nextProtoNeg {
|
|
msg, err := c.readHandshake()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
nextProto, ok := msg.(*nextProtoMsg)
|
|
if !ok {
|
|
c.sendAlert(alertUnexpectedMessage)
|
|
return unexpectedMessageError(nextProto, msg)
|
|
}
|
|
hs.finishedHash.Write(nextProto.marshal())
|
|
c.clientProtocol = nextProto.proto
|
|
}
|
|
|
|
msg, err := c.readHandshake()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
clientFinished, ok := msg.(*finishedMsg)
|
|
if !ok {
|
|
c.sendAlert(alertUnexpectedMessage)
|
|
return unexpectedMessageError(clientFinished, msg)
|
|
}
|
|
|
|
verify := hs.finishedHash.clientSum(hs.masterSecret)
|
|
if len(verify) != len(clientFinished.verifyData) ||
|
|
subtle.ConstantTimeCompare(verify, clientFinished.verifyData) != 1 {
|
|
c.sendAlert(alertHandshakeFailure)
|
|
return errors.New("tls: client's Finished message is incorrect")
|
|
}
|
|
|
|
hs.finishedHash.Write(clientFinished.marshal())
|
|
copy(out, verify)
|
|
return nil
|
|
}
|
|
|
|
func (hs *serverHandshakeState) sendSessionTicket() error {
|
|
if !hs.hello.ticketSupported {
|
|
return nil
|
|
}
|
|
|
|
c := hs.c
|
|
m := new(newSessionTicketMsg)
|
|
|
|
var certsFromClient [][]byte
|
|
for _, cert := range c.peerCertificates {
|
|
certsFromClient = append(certsFromClient, cert.Raw)
|
|
}
|
|
state := sessionState{
|
|
vers: c.vers,
|
|
cipherSuite: hs.suite.id,
|
|
masterSecret: hs.masterSecret,
|
|
certificates: certsFromClient,
|
|
}
|
|
var err error
|
|
m.ticket, err = c.encryptTicket(state.marshal())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
hs.finishedHash.Write(m.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, m.marshal()); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (hs *serverHandshakeState) sendFinished(out []byte) error {
|
|
c := hs.c
|
|
|
|
if _, err := c.writeRecord(recordTypeChangeCipherSpec, []byte{1}); err != nil {
|
|
return err
|
|
}
|
|
|
|
finished := new(finishedMsg)
|
|
finished.verifyData = hs.finishedHash.serverSum(hs.masterSecret)
|
|
hs.finishedHash.Write(finished.marshal())
|
|
if _, err := c.writeRecord(recordTypeHandshake, finished.marshal()); err != nil {
|
|
return err
|
|
}
|
|
|
|
c.cipherSuite = hs.suite.id
|
|
copy(out, finished.verifyData)
|
|
|
|
return nil
|
|
}
|
|
|
|
// processCertsFromClient takes a chain of client certificates either from a
|
|
// Certificates message or from a sessionState and verifies them. It returns
|
|
// the public key of the leaf certificate.
|
|
func (c *Conn) processCertsFromClient(certificate Certificate) error {
|
|
certificates := certificate.Certificate
|
|
certs := make([]*x509.Certificate, len(certificates))
|
|
var err error
|
|
for i, asn1Data := range certificates {
|
|
if certs[i], err = x509.ParseCertificate(asn1Data); err != nil {
|
|
c.sendAlert(alertBadCertificate)
|
|
return errors.New("tls: failed to parse client certificate: " + err.Error())
|
|
}
|
|
}
|
|
|
|
if len(certs) == 0 && requiresClientCert(c.config.ClientAuth) {
|
|
c.sendAlert(alertBadCertificate)
|
|
return errors.New("tls: client didn't provide a certificate")
|
|
}
|
|
|
|
if c.config.ClientAuth >= VerifyClientCertIfGiven && len(certs) > 0 {
|
|
opts := x509.VerifyOptions{
|
|
Roots: c.config.ClientCAs,
|
|
CurrentTime: c.config.time(),
|
|
Intermediates: x509.NewCertPool(),
|
|
KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
|
|
}
|
|
|
|
for _, cert := range certs[1:] {
|
|
opts.Intermediates.AddCert(cert)
|
|
}
|
|
|
|
chains, err := certs[0].Verify(opts)
|
|
if err != nil {
|
|
c.sendAlert(alertBadCertificate)
|
|
return errors.New("tls: failed to verify client's certificate: " + err.Error())
|
|
}
|
|
|
|
c.verifiedChains = chains
|
|
}
|
|
|
|
if c.config.VerifyPeerCertificate != nil {
|
|
if err := c.config.VerifyPeerCertificate(certificates, c.verifiedChains); err != nil {
|
|
c.sendAlert(alertBadCertificate)
|
|
return err
|
|
}
|
|
}
|
|
|
|
if len(certs) == 0 {
|
|
return nil
|
|
}
|
|
|
|
switch certs[0].PublicKey.(type) {
|
|
case *ecdsa.PublicKey, *rsa.PublicKey:
|
|
default:
|
|
c.sendAlert(alertUnsupportedCertificate)
|
|
return fmt.Errorf("tls: client's certificate contains an unsupported public key of type %T", certs[0].PublicKey)
|
|
}
|
|
|
|
c.peerCertificates = certs
|
|
c.ocspResponse = certificate.OCSPStaple
|
|
c.scts = certificate.SignedCertificateTimestamps
|
|
return nil
|
|
}
|
|
|
|
// setCipherSuite sets a cipherSuite with the given id as the serverHandshakeState
|
|
// suite if that cipher suite is acceptable to use.
|
|
// It returns a bool indicating if the suite was set.
|
|
func (hs *serverHandshakeState) setCipherSuite(id uint16, supportedCipherSuites []uint16, version uint16) bool {
|
|
for _, supported := range supportedCipherSuites {
|
|
if id == supported {
|
|
candidate := cipherSuiteByID(id)
|
|
if candidate == nil {
|
|
continue
|
|
}
|
|
// Don't select a ciphersuite which we can't
|
|
// support for this client.
|
|
if candidate.flags&suiteECDHE != 0 {
|
|
if !hs.ellipticOk {
|
|
continue
|
|
}
|
|
if candidate.flags&suiteECDSA != 0 {
|
|
if !hs.ecdsaOk {
|
|
continue
|
|
}
|
|
} else if !hs.rsaSignOk {
|
|
continue
|
|
}
|
|
} else if !hs.rsaDecryptOk {
|
|
continue
|
|
}
|
|
if version < VersionTLS12 && candidate.flags&suiteTLS12 != 0 {
|
|
continue
|
|
}
|
|
hs.suite = candidate
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func clientHelloInfo(c *Conn, clientHello *clientHelloMsg) *ClientHelloInfo {
|
|
supportedVersions := clientHello.supportedVersions
|
|
if len(clientHello.supportedVersions) == 0 {
|
|
supportedVersions = supportedVersionsFromMax(clientHello.vers)
|
|
}
|
|
|
|
return &ClientHelloInfo{
|
|
CipherSuites: clientHello.cipherSuites,
|
|
ServerName: clientHello.serverName,
|
|
SupportedCurves: clientHello.supportedCurves,
|
|
SupportedPoints: clientHello.supportedPoints,
|
|
SignatureSchemes: clientHello.supportedSignatureAlgorithms,
|
|
SupportedProtos: clientHello.alpnProtocols,
|
|
SupportedVersions: supportedVersions,
|
|
Conn: c.conn,
|
|
}
|
|
}
|