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Copy pathhandshake_server_tls13.go
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handshake_server_tls13.go
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// Copyright 2018 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 (
"bytes"
"context"
"crypto"
"crypto/hmac"
"crypto/rsa"
"errors"
"hash"
"io"
"slices"
"time"
"github.com/refraction-networking/utls/internal/byteorder"
"github.com/refraction-networking/utls/internal/mlkem768"
)
// maxClientPSKIdentities is the number of client PSK identities the server will
// attempt to validate. It will ignore the rest not to let cheap ClientHello
// messages cause too much work in session ticket decryption attempts.
const maxClientPSKIdentities = 5
type serverHandshakeStateTLS13 struct {
c *Conn
ctx context.Context
clientHello *clientHelloMsg
hello *serverHelloMsg
sentDummyCCS bool
usingPSK bool
earlyData bool
suite *cipherSuiteTLS13
cert *Certificate
sigAlg SignatureScheme
selectedGroup CurveID
earlySecret []byte
sharedKey []byte
handshakeSecret []byte
masterSecret []byte
trafficSecret []byte // client_application_traffic_secret_0
transcript hash.Hash
clientFinished []byte
}
func (hs *serverHandshakeStateTLS13) handshake() error {
c := hs.c
if needFIPS() {
return errors.New("tls: internal error: TLS 1.3 reached in FIPS mode")
}
// For an overview of the TLS 1.3 handshake, see RFC 8446, Section 2.
if err := hs.processClientHello(); err != nil {
return err
}
if err := hs.checkForResumption(); err != nil {
return err
}
if err := hs.pickCertificate(); err != nil {
return err
}
c.buffering = true
if err := hs.sendServerParameters(); err != nil {
return err
}
if err := hs.sendServerCertificate(); err != nil {
return err
}
if err := hs.sendServerFinished(); err != nil {
return err
}
// Note that at this point we could start sending application data without
// waiting for the client's second flight, but the application might not
// expect the lack of replay protection of the ClientHello parameters.
if _, err := c.flush(); err != nil {
return err
}
if err := hs.readClientCertificate(); err != nil {
return err
}
if err := hs.readClientFinished(); err != nil {
return err
}
c.isHandshakeComplete.Store(true)
return nil
}
func (hs *serverHandshakeStateTLS13) processClientHello() error {
c := hs.c
hs.hello = new(serverHelloMsg)
// TLS 1.3 froze the ServerHello.legacy_version field, and uses
// supported_versions instead. See RFC 8446, sections 4.1.3 and 4.2.1.
hs.hello.vers = VersionTLS12
hs.hello.supportedVersion = c.vers
if len(hs.clientHello.supportedVersions) == 0 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client used the legacy version field to negotiate TLS 1.3")
}
// Abort if the client is doing a fallback and landing lower than what we
// support. See RFC 7507, which however does not specify the interaction
// with supported_versions. The only difference is that with
// supported_versions a client has a chance to attempt a [TLS 1.2, TLS 1.4]
// handshake in case TLS 1.3 is broken but 1.2 is not. Alas, in that case,
// it will have to drop the TLS_FALLBACK_SCSV protection if it falls back to
// TLS 1.2, because a TLS 1.3 server would abort here. The situation before
// supported_versions was not better because there was just no way to do a
// TLS 1.4 handshake without risking the server selecting TLS 1.3.
for _, id := range hs.clientHello.cipherSuites {
if id == TLS_FALLBACK_SCSV {
// Use c.vers instead of max(supported_versions) because an attacker
// could defeat this by adding an arbitrary high version otherwise.
if c.vers < c.config.maxSupportedVersion(roleServer) {
c.sendAlert(alertInappropriateFallback)
return errors.New("tls: client using inappropriate protocol fallback")
}
break
}
}
if len(hs.clientHello.compressionMethods) != 1 ||
hs.clientHello.compressionMethods[0] != compressionNone {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: TLS 1.3 client supports illegal compression methods")
}
hs.hello.random = make([]byte, 32)
if _, err := io.ReadFull(c.config.rand(), hs.hello.random); 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")
}
if hs.clientHello.earlyData && c.quic != nil {
if len(hs.clientHello.pskIdentities) == 0 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: early_data without pre_shared_key")
}
} else if hs.clientHello.earlyData {
// See RFC 8446, Section 4.2.10 for the complicated behavior required
// here. The scenario is that a different server at our address offered
// to accept early data in the past, which we can't handle. For now, all
// 0-RTT enabled session tickets need to expire before a Go server can
// replace a server or join a pool. That's the same requirement that
// applies to mixing or replacing with any TLS 1.2 server.
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: client sent unexpected early data")
}
hs.hello.sessionId = hs.clientHello.sessionId
hs.hello.compressionMethod = compressionNone
preferenceList := defaultCipherSuitesTLS13
if !hasAESGCMHardwareSupport || !aesgcmPreferred(hs.clientHello.cipherSuites) {
preferenceList = defaultCipherSuitesTLS13NoAES
}
for _, suiteID := range preferenceList {
hs.suite = mutualCipherSuiteTLS13(hs.clientHello.cipherSuites, suiteID)
if hs.suite != nil {
break
}
}
if hs.suite == nil {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no cipher suite supported by both client and server")
}
c.cipherSuite = hs.suite.id
hs.hello.cipherSuite = hs.suite.id
hs.transcript = hs.suite.hash.New()
// Pick the key exchange method in server preference order, but give
// priority to key shares, to avoid a HelloRetryRequest round-trip.
var selectedGroup CurveID
var clientKeyShare *keyShare
preferredGroups := c.config.curvePreferences(c.vers)
for _, preferredGroup := range preferredGroups {
ki := slices.IndexFunc(hs.clientHello.keyShares, func(ks keyShare) bool {
return ks.group == preferredGroup
})
if ki != -1 {
clientKeyShare = &hs.clientHello.keyShares[ki]
selectedGroup = clientKeyShare.group
if !slices.Contains(hs.clientHello.supportedCurves, selectedGroup) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client sent key share for group it does not support")
}
break
}
}
if selectedGroup == 0 {
for _, preferredGroup := range preferredGroups {
if slices.Contains(hs.clientHello.supportedCurves, preferredGroup) {
selectedGroup = preferredGroup
break
}
}
}
if selectedGroup == 0 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no ECDHE curve supported by both client and server")
}
if clientKeyShare == nil {
ks, err := hs.doHelloRetryRequest(selectedGroup)
if err != nil {
return err
}
clientKeyShare = ks
}
c.curveID = selectedGroup
ecdhGroup := selectedGroup
ecdhData := clientKeyShare.data
if selectedGroup == x25519Kyber768Draft00 {
ecdhGroup = X25519
if len(ecdhData) != x25519PublicKeySize+mlkem768.EncapsulationKeySize {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid Kyber client key share")
}
ecdhData = ecdhData[:x25519PublicKeySize]
}
if _, ok := curveForCurveID(ecdhGroup); !ok {
c.sendAlert(alertInternalError)
return errors.New("tls: CurvePreferences includes unsupported curve")
}
key, err := generateECDHEKey(c.config.rand(), ecdhGroup)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
hs.hello.serverShare = keyShare{group: selectedGroup, data: key.PublicKey().Bytes()}
peerKey, err := key.Curve().NewPublicKey(ecdhData)
if err != nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid client key share")
}
hs.sharedKey, err = key.ECDH(peerKey)
if err != nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid client key share")
}
if selectedGroup == x25519Kyber768Draft00 {
ciphertext, kyberShared, err := kyberEncapsulate(clientKeyShare.data[x25519PublicKeySize:])
if err != nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid Kyber client key share")
}
hs.sharedKey = append(hs.sharedKey, kyberShared...)
hs.hello.serverShare.data = append(hs.hello.serverShare.data, ciphertext...)
}
selectedProto, err := negotiateALPN(c.config.NextProtos, hs.clientHello.alpnProtocols, c.quic != nil)
if err != nil {
c.sendAlert(alertNoApplicationProtocol)
return err
}
c.clientProtocol = selectedProto
if c.quic != nil {
// RFC 9001 Section 4.2: Clients MUST NOT offer TLS versions older than 1.3.
for _, v := range hs.clientHello.supportedVersions {
if v < VersionTLS13 {
c.sendAlert(alertProtocolVersion)
return errors.New("tls: client offered TLS version older than TLS 1.3")
}
}
// RFC 9001 Section 8.2.
if hs.clientHello.quicTransportParameters == nil {
c.sendAlert(alertMissingExtension)
return errors.New("tls: client did not send a quic_transport_parameters extension")
}
c.quicSetTransportParameters(hs.clientHello.quicTransportParameters)
} else {
if hs.clientHello.quicTransportParameters != nil {
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: client sent an unexpected quic_transport_parameters extension")
}
}
c.serverName = hs.clientHello.serverName
return nil
}
func (hs *serverHandshakeStateTLS13) checkForResumption() error {
c := hs.c
if c.config.SessionTicketsDisabled {
return nil
}
modeOK := false
for _, mode := range hs.clientHello.pskModes {
if mode == pskModeDHE {
modeOK = true
break
}
}
if !modeOK {
return nil
}
if len(hs.clientHello.pskIdentities) != len(hs.clientHello.pskBinders) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid or missing PSK binders")
}
if len(hs.clientHello.pskIdentities) == 0 {
return nil
}
for i, identity := range hs.clientHello.pskIdentities {
if i >= maxClientPSKIdentities {
break
}
var sessionState *SessionState
if c.config.UnwrapSession != nil {
var err error
sessionState, err = c.config.UnwrapSession(identity.label, c.connectionStateLocked())
if err != nil {
return err
}
if sessionState == nil {
continue
}
} else {
plaintext := c.config.decryptTicket(identity.label, c.ticketKeys)
if plaintext == nil {
continue
}
var err error
sessionState, err = ParseSessionState(plaintext)
if err != nil {
continue
}
}
if sessionState.version != VersionTLS13 {
continue
}
createdAt := time.Unix(int64(sessionState.createdAt), 0)
if c.config.time().Sub(createdAt) > maxSessionTicketLifetime {
continue
}
pskSuite := cipherSuiteTLS13ByID(sessionState.cipherSuite)
if pskSuite == nil || pskSuite.hash != hs.suite.hash {
continue
}
// PSK connections don't re-establish client certificates, but carry
// them over in the session ticket. Ensure the presence of client certs
// in the ticket is consistent with the configured requirements.
sessionHasClientCerts := len(sessionState.peerCertificates) != 0
needClientCerts := requiresClientCert(c.config.ClientAuth)
if needClientCerts && !sessionHasClientCerts {
continue
}
if sessionHasClientCerts && c.config.ClientAuth == NoClientCert {
continue
}
if sessionHasClientCerts && c.config.time().After(sessionState.peerCertificates[0].NotAfter) {
continue
}
if sessionHasClientCerts && c.config.ClientAuth >= VerifyClientCertIfGiven &&
len(sessionState.verifiedChains) == 0 {
continue
}
if c.quic != nil && c.quic.enableSessionEvents {
if err := c.quicResumeSession(sessionState); err != nil {
return err
}
}
hs.earlySecret = hs.suite.extract(sessionState.secret, nil)
binderKey := hs.suite.deriveSecret(hs.earlySecret, resumptionBinderLabel, nil)
// Clone the transcript in case a HelloRetryRequest was recorded.
transcript := cloneHash(hs.transcript, hs.suite.hash)
if transcript == nil {
c.sendAlert(alertInternalError)
return errors.New("tls: internal error: failed to clone hash")
}
clientHelloBytes, err := hs.clientHello.marshalWithoutBinders()
if err != nil {
c.sendAlert(alertInternalError)
return err
}
transcript.Write(clientHelloBytes)
pskBinder := hs.suite.finishedHash(binderKey, transcript)
if !hmac.Equal(hs.clientHello.pskBinders[i], pskBinder) {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid PSK binder")
}
if c.quic != nil && hs.clientHello.earlyData && i == 0 &&
sessionState.EarlyData && sessionState.cipherSuite == hs.suite.id &&
sessionState.alpnProtocol == c.clientProtocol {
hs.earlyData = true
transcript := hs.suite.hash.New()
if err := transcriptMsg(hs.clientHello, transcript); err != nil {
return err
}
earlyTrafficSecret := hs.suite.deriveSecret(hs.earlySecret, clientEarlyTrafficLabel, transcript)
c.quicSetReadSecret(QUICEncryptionLevelEarly, hs.suite.id, earlyTrafficSecret)
}
c.didResume = true
c.peerCertificates = sessionState.peerCertificates
c.ocspResponse = sessionState.ocspResponse
c.scts = sessionState.scts
c.verifiedChains = sessionState.verifiedChains
hs.hello.selectedIdentityPresent = true
hs.hello.selectedIdentity = uint16(i)
hs.usingPSK = true
return nil
}
return nil
}
// cloneHash uses the encoding.BinaryMarshaler and encoding.BinaryUnmarshaler
// interfaces implemented by standard library hashes to clone the state of in
// to a new instance of h. It returns nil if the operation fails.
func cloneHash(in hash.Hash, h crypto.Hash) hash.Hash {
// Recreate the interface to avoid importing encoding.
type binaryMarshaler interface {
MarshalBinary() (data []byte, err error)
UnmarshalBinary(data []byte) error
}
marshaler, ok := in.(binaryMarshaler)
if !ok {
return nil
}
state, err := marshaler.MarshalBinary()
if err != nil {
return nil
}
out := h.New()
unmarshaler, ok := out.(binaryMarshaler)
if !ok {
return nil
}
if err := unmarshaler.UnmarshalBinary(state); err != nil {
return nil
}
return out
}
func (hs *serverHandshakeStateTLS13) pickCertificate() error {
c := hs.c
// Only one of PSK and certificates are used at a time.
if hs.usingPSK {
return nil
}
// signature_algorithms is required in TLS 1.3. See RFC 8446, Section 4.2.3.
if len(hs.clientHello.supportedSignatureAlgorithms) == 0 {
return c.sendAlert(alertMissingExtension)
}
certificate, err := c.config.getCertificate(clientHelloInfo(hs.ctx, c, hs.clientHello))
if err != nil {
if err == errNoCertificates {
c.sendAlert(alertUnrecognizedName)
} else {
c.sendAlert(alertInternalError)
}
return err
}
hs.sigAlg, err = selectSignatureScheme(c.vers, certificate, hs.clientHello.supportedSignatureAlgorithms)
if err != nil {
// getCertificate returned a certificate that is unsupported or
// incompatible with the client's signature algorithms.
c.sendAlert(alertHandshakeFailure)
return err
}
hs.cert = certificate
return nil
}
// sendDummyChangeCipherSpec sends a ChangeCipherSpec record for compatibility
// with middleboxes that didn't implement TLS correctly. See RFC 8446, Appendix D.4.
func (hs *serverHandshakeStateTLS13) sendDummyChangeCipherSpec() error {
if hs.c.quic != nil {
return nil
}
if hs.sentDummyCCS {
return nil
}
hs.sentDummyCCS = true
return hs.c.writeChangeCipherRecord()
}
func (hs *serverHandshakeStateTLS13) doHelloRetryRequest(selectedGroup CurveID) (*keyShare, error) {
c := hs.c
// The first ClientHello gets double-hashed into the transcript upon a
// HelloRetryRequest. See RFC 8446, Section 4.4.1.
if err := transcriptMsg(hs.clientHello, hs.transcript); err != nil {
return nil, err
}
chHash := hs.transcript.Sum(nil)
hs.transcript.Reset()
hs.transcript.Write([]byte{typeMessageHash, 0, 0, uint8(len(chHash))})
hs.transcript.Write(chHash)
helloRetryRequest := &serverHelloMsg{
vers: hs.hello.vers,
random: helloRetryRequestRandom,
sessionId: hs.hello.sessionId,
cipherSuite: hs.hello.cipherSuite,
compressionMethod: hs.hello.compressionMethod,
supportedVersion: hs.hello.supportedVersion,
selectedGroup: selectedGroup,
}
if _, err := hs.c.writeHandshakeRecord(helloRetryRequest, hs.transcript); err != nil {
return nil, err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return nil, err
}
// clientHelloMsg is not included in the transcript.
msg, err := c.readHandshake(nil)
if err != nil {
return nil, err
}
clientHello, ok := msg.(*clientHelloMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return nil, unexpectedMessageError(clientHello, msg)
}
if len(clientHello.keyShares) != 1 {
c.sendAlert(alertIllegalParameter)
return nil, errors.New("tls: client didn't send one key share in second ClientHello")
}
ks := &clientHello.keyShares[0]
if ks.group != selectedGroup {
c.sendAlert(alertIllegalParameter)
return nil, errors.New("tls: client sent unexpected key share in second ClientHello")
}
if clientHello.earlyData {
c.sendAlert(alertIllegalParameter)
return nil, errors.New("tls: client indicated early data in second ClientHello")
}
if illegalClientHelloChange(clientHello, hs.clientHello) {
c.sendAlert(alertIllegalParameter)
return nil, errors.New("tls: client illegally modified second ClientHello")
}
c.didHRR = true
hs.clientHello = clientHello
return ks, nil
}
// illegalClientHelloChange reports whether the two ClientHello messages are
// different, with the exception of the changes allowed before and after a
// HelloRetryRequest. See RFC 8446, Section 4.1.2.
func illegalClientHelloChange(ch, ch1 *clientHelloMsg) bool {
if len(ch.supportedVersions) != len(ch1.supportedVersions) ||
len(ch.cipherSuites) != len(ch1.cipherSuites) ||
len(ch.supportedCurves) != len(ch1.supportedCurves) ||
len(ch.supportedSignatureAlgorithms) != len(ch1.supportedSignatureAlgorithms) ||
len(ch.supportedSignatureAlgorithmsCert) != len(ch1.supportedSignatureAlgorithmsCert) ||
len(ch.alpnProtocols) != len(ch1.alpnProtocols) {
return true
}
for i := range ch.supportedVersions {
if ch.supportedVersions[i] != ch1.supportedVersions[i] {
return true
}
}
for i := range ch.cipherSuites {
if ch.cipherSuites[i] != ch1.cipherSuites[i] {
return true
}
}
for i := range ch.supportedCurves {
if ch.supportedCurves[i] != ch1.supportedCurves[i] {
return true
}
}
for i := range ch.supportedSignatureAlgorithms {
if ch.supportedSignatureAlgorithms[i] != ch1.supportedSignatureAlgorithms[i] {
return true
}
}
for i := range ch.supportedSignatureAlgorithmsCert {
if ch.supportedSignatureAlgorithmsCert[i] != ch1.supportedSignatureAlgorithmsCert[i] {
return true
}
}
for i := range ch.alpnProtocols {
if ch.alpnProtocols[i] != ch1.alpnProtocols[i] {
return true
}
}
return ch.vers != ch1.vers ||
!bytes.Equal(ch.random, ch1.random) ||
!bytes.Equal(ch.sessionId, ch1.sessionId) ||
!bytes.Equal(ch.compressionMethods, ch1.compressionMethods) ||
ch.serverName != ch1.serverName ||
ch.ocspStapling != ch1.ocspStapling ||
!bytes.Equal(ch.supportedPoints, ch1.supportedPoints) ||
ch.ticketSupported != ch1.ticketSupported ||
!bytes.Equal(ch.sessionTicket, ch1.sessionTicket) ||
ch.secureRenegotiationSupported != ch1.secureRenegotiationSupported ||
!bytes.Equal(ch.secureRenegotiation, ch1.secureRenegotiation) ||
ch.scts != ch1.scts ||
!bytes.Equal(ch.cookie, ch1.cookie) ||
!bytes.Equal(ch.pskModes, ch1.pskModes)
}
func (hs *serverHandshakeStateTLS13) sendServerParameters() error {
c := hs.c
if err := transcriptMsg(hs.clientHello, hs.transcript); err != nil {
return err
}
if _, err := hs.c.writeHandshakeRecord(hs.hello, hs.transcript); err != nil {
return err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
earlySecret := hs.earlySecret
if earlySecret == nil {
earlySecret = hs.suite.extract(nil, nil)
}
hs.handshakeSecret = hs.suite.extract(hs.sharedKey,
hs.suite.deriveSecret(earlySecret, "derived", nil))
clientSecret := hs.suite.deriveSecret(hs.handshakeSecret,
clientHandshakeTrafficLabel, hs.transcript)
c.in.setTrafficSecret(hs.suite, QUICEncryptionLevelHandshake, clientSecret)
serverSecret := hs.suite.deriveSecret(hs.handshakeSecret,
serverHandshakeTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, QUICEncryptionLevelHandshake, serverSecret)
if c.quic != nil {
if c.hand.Len() != 0 {
c.sendAlert(alertUnexpectedMessage)
}
c.quicSetWriteSecret(QUICEncryptionLevelHandshake, hs.suite.id, serverSecret)
c.quicSetReadSecret(QUICEncryptionLevelHandshake, hs.suite.id, clientSecret)
}
err := c.config.writeKeyLog(keyLogLabelClientHandshake, hs.clientHello.random, clientSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerHandshake, hs.clientHello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
encryptedExtensions := new(encryptedExtensionsMsg)
encryptedExtensions.alpnProtocol = c.clientProtocol
if c.quic != nil {
p, err := c.quicGetTransportParameters()
if err != nil {
return err
}
encryptedExtensions.quicTransportParameters = p
encryptedExtensions.earlyData = hs.earlyData
}
if _, err := hs.c.writeHandshakeRecord(encryptedExtensions, hs.transcript); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) requestClientCert() bool {
return hs.c.config.ClientAuth >= RequestClientCert && !hs.usingPSK
}
func (hs *serverHandshakeStateTLS13) sendServerCertificate() error {
c := hs.c
// Only one of PSK and certificates are used at a time.
if hs.usingPSK {
return nil
}
if hs.requestClientCert() {
// Request a client certificate
certReq := new(certificateRequestMsgTLS13)
certReq.ocspStapling = true
certReq.scts = true
certReq.supportedSignatureAlgorithms = c.config.supportedSignatureAlgorithms() // [UTLS] ported from cloudflare/go
if c.config.ClientCAs != nil {
certReq.certificateAuthorities = c.config.ClientCAs.Subjects()
}
if _, err := hs.c.writeHandshakeRecord(certReq, hs.transcript); err != nil {
return err
}
}
certMsg := new(certificateMsgTLS13)
certMsg.certificate = *hs.cert
certMsg.scts = hs.clientHello.scts && len(hs.cert.SignedCertificateTimestamps) > 0
certMsg.ocspStapling = hs.clientHello.ocspStapling && len(hs.cert.OCSPStaple) > 0
if _, err := hs.c.writeHandshakeRecord(certMsg, hs.transcript); err != nil {
return err
}
certVerifyMsg := new(certificateVerifyMsg)
certVerifyMsg.hasSignatureAlgorithm = true
certVerifyMsg.signatureAlgorithm = hs.sigAlg
sigType, sigHash, err := typeAndHashFromSignatureScheme(hs.sigAlg)
if err != nil {
return c.sendAlert(alertInternalError)
}
signed := signedMessage(sigHash, serverSignatureContext, hs.transcript)
signOpts := crypto.SignerOpts(sigHash)
if sigType == signatureRSAPSS {
signOpts = &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash, Hash: sigHash}
}
sig, err := hs.cert.PrivateKey.(crypto.Signer).Sign(c.config.rand(), signed, signOpts)
if err != nil {
public := hs.cert.PrivateKey.(crypto.Signer).Public()
if rsaKey, ok := public.(*rsa.PublicKey); ok && sigType == signatureRSAPSS &&
rsaKey.N.BitLen()/8 < sigHash.Size()*2+2 { // key too small for RSA-PSS
c.sendAlert(alertHandshakeFailure)
} else {
c.sendAlert(alertInternalError)
}
return errors.New("tls: failed to sign handshake: " + err.Error())
}
certVerifyMsg.signature = sig
if _, err := hs.c.writeHandshakeRecord(certVerifyMsg, hs.transcript); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) sendServerFinished() error {
c := hs.c
finished := &finishedMsg{
verifyData: hs.suite.finishedHash(c.out.trafficSecret, hs.transcript),
}
if _, err := hs.c.writeHandshakeRecord(finished, hs.transcript); err != nil {
return err
}
// Derive secrets that take context through the server Finished.
hs.masterSecret = hs.suite.extract(nil,
hs.suite.deriveSecret(hs.handshakeSecret, "derived", nil))
hs.trafficSecret = hs.suite.deriveSecret(hs.masterSecret,
clientApplicationTrafficLabel, hs.transcript)
serverSecret := hs.suite.deriveSecret(hs.masterSecret,
serverApplicationTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, QUICEncryptionLevelApplication, serverSecret)
if c.quic != nil {
if c.hand.Len() != 0 {
// TODO: Handle this in setTrafficSecret?
c.sendAlert(alertUnexpectedMessage)
}
c.quicSetWriteSecret(QUICEncryptionLevelApplication, hs.suite.id, serverSecret)
}
err := c.config.writeKeyLog(keyLogLabelClientTraffic, hs.clientHello.random, hs.trafficSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerTraffic, hs.clientHello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
c.ekm = hs.suite.exportKeyingMaterial(hs.masterSecret, hs.transcript)
// If we did not request client certificates, at this point we can
// precompute the client finished and roll the transcript forward to send
// session tickets in our first flight.
if !hs.requestClientCert() {
if err := hs.sendSessionTickets(); err != nil {
return err
}
}
return nil
}
func (hs *serverHandshakeStateTLS13) shouldSendSessionTickets() bool {
if hs.c.config.SessionTicketsDisabled {
return false
}
// QUIC tickets are sent by QUICConn.SendSessionTicket, not automatically.
if hs.c.quic != nil {
return false
}
// Don't send tickets the client wouldn't use. See RFC 8446, Section 4.2.9.
for _, pskMode := range hs.clientHello.pskModes {
if pskMode == pskModeDHE {
return true
}
}
return false
}
func (hs *serverHandshakeStateTLS13) sendSessionTickets() error {
c := hs.c
hs.clientFinished = hs.suite.finishedHash(c.in.trafficSecret, hs.transcript)
finishedMsg := &finishedMsg{
verifyData: hs.clientFinished,
}
if err := transcriptMsg(finishedMsg, hs.transcript); err != nil {
return err
}
c.resumptionSecret = hs.suite.deriveSecret(hs.masterSecret,
resumptionLabel, hs.transcript)
if !hs.shouldSendSessionTickets() {
return nil
}
return c.sendSessionTicket(false, nil)
}
func (c *Conn) sendSessionTicket(earlyData bool, extra [][]byte) error {
suite := cipherSuiteTLS13ByID(c.cipherSuite)
if suite == nil {
return errors.New("tls: internal error: unknown cipher suite")
}
// ticket_nonce, which must be unique per connection, is always left at
// zero because we only ever send one ticket per connection.
psk := suite.expandLabel(c.resumptionSecret, "resumption",
nil, suite.hash.Size())
m := new(newSessionTicketMsgTLS13)
state := c.sessionState()
state.secret = psk
state.EarlyData = earlyData
state.Extra = extra
if c.config.WrapSession != nil {
var err error
m.label, err = c.config.WrapSession(c.connectionStateLocked(), state)
if err != nil {
return err
}
} else {
stateBytes, err := state.Bytes()
if err != nil {
c.sendAlert(alertInternalError)
return err
}
m.label, err = c.config.encryptTicket(stateBytes, c.ticketKeys)
if err != nil {
return err
}
}
m.lifetime = uint32(maxSessionTicketLifetime / time.Second)
// ticket_age_add is a random 32-bit value. See RFC 8446, section 4.6.1
// The value is not stored anywhere; we never need to check the ticket age
// because 0-RTT is not supported.
ageAdd := make([]byte, 4)
if _, err := c.config.rand().Read(ageAdd); err != nil {
return err
}
m.ageAdd = byteorder.LeUint32(ageAdd)
if earlyData {
// RFC 9001, Section 4.6.1
m.maxEarlyData = 0xffffffff
}
if _, err := c.writeHandshakeRecord(m, nil); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) readClientCertificate() error {
c := hs.c
if !hs.requestClientCert() {
// Make sure the connection is still being verified whether or not
// the server requested a client certificate.
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
return nil
}
// If we requested a client certificate, then the client must send a
// certificate message. If it's empty, no CertificateVerify is sent.
msg, err := c.readHandshake(hs.transcript)
if err != nil {
return err
}
certMsg, ok := msg.(*certificateMsgTLS13)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certMsg, msg)
}
if err := c.processCertsFromClient(certMsg.certificate); err != nil {
return err
}
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
if len(certMsg.certificate.Certificate) != 0 {
// certificateVerifyMsg is included in the transcript, but not until
// after we verify the handshake signature, since the state before
// this message was sent is used.
msg, err = c.readHandshake(nil)
if err != nil {
return err
}
certVerify, ok := msg.(*certificateVerifyMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certVerify, msg)
}
// See RFC 8446, Section 4.4.3.
if !isSupportedSignatureAlgorithm(certVerify.signatureAlgorithm, c.config.supportedSignatureAlgorithms()) { // [UTLS] ported from cloudflare/go
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
sigType, sigHash, err := typeAndHashFromSignatureScheme(certVerify.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
if sigType == signaturePKCS1v15 || sigHash == crypto.SHA1 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
signed := signedMessage(sigHash, clientSignatureContext, hs.transcript)
if err := verifyHandshakeSignature(sigType, c.peerCertificates[0].PublicKey,
sigHash, signed, certVerify.signature); err != nil {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid signature by the client certificate: " + err.Error())
}