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u_handshake_client.go
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u_handshake_client.go
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// Copyright 2022 uTLS 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"
"compress/zlib"
"errors"
"fmt"
"io"
"github.com/andybalholm/brotli"
"github.com/klauspost/compress/zstd"
)
// This function is called by (*clientHandshakeStateTLS13).readServerCertificate()
// to retrieve the certificate out of a message read by (*Conn).readHandshake()
func (hs *clientHandshakeStateTLS13) utlsReadServerCertificate(msg any) (processedMsg any, err error) {
for _, ext := range hs.uconn.Extensions {
switch ext.(type) {
case *UtlsCompressCertExtension:
// Included Compressed Certificate extension
if len(hs.uconn.certCompressionAlgs) > 0 {
compressedCertMsg, ok := msg.(*utlsCompressedCertificateMsg)
if ok {
if err = transcriptMsg(compressedCertMsg, hs.transcript); err != nil {
return nil, err
}
msg, err = hs.decompressCert(*compressedCertMsg)
if err != nil {
return nil, fmt.Errorf("tls: failed to decompress certificate message: %w", err)
} else {
return msg, nil
}
}
}
default:
continue
}
}
return nil, nil
}
// called by (*clientHandshakeStateTLS13).utlsReadServerCertificate() when UtlsCompressCertExtension is used
func (hs *clientHandshakeStateTLS13) decompressCert(m utlsCompressedCertificateMsg) (*certificateMsgTLS13, error) {
var (
decompressed io.Reader
compressed = bytes.NewReader(m.compressedCertificateMessage)
c = hs.c
)
// Check to see if the peer responded with an algorithm we advertised.
supportedAlg := false
for _, alg := range hs.uconn.certCompressionAlgs {
if m.algorithm == uint16(alg) {
supportedAlg = true
}
}
if !supportedAlg {
c.sendAlert(alertBadCertificate)
return nil, fmt.Errorf("unadvertised algorithm (%d)", m.algorithm)
}
switch CertCompressionAlgo(m.algorithm) {
case CertCompressionBrotli:
decompressed = brotli.NewReader(compressed)
case CertCompressionZlib:
rc, err := zlib.NewReader(compressed)
if err != nil {
c.sendAlert(alertBadCertificate)
return nil, fmt.Errorf("failed to open zlib reader: %w", err)
}
defer rc.Close()
decompressed = rc
case CertCompressionZstd:
rc, err := zstd.NewReader(compressed)
if err != nil {
c.sendAlert(alertBadCertificate)
return nil, fmt.Errorf("failed to open zstd reader: %w", err)
}
defer rc.Close()
decompressed = rc
default:
c.sendAlert(alertBadCertificate)
return nil, fmt.Errorf("unsupported algorithm (%d)", m.algorithm)
}
rawMsg := make([]byte, m.uncompressedLength+4) // +4 for message type and uint24 length field
rawMsg[0] = typeCertificate
rawMsg[1] = uint8(m.uncompressedLength >> 16)
rawMsg[2] = uint8(m.uncompressedLength >> 8)
rawMsg[3] = uint8(m.uncompressedLength)
n, err := decompressed.Read(rawMsg[4:])
if err != nil && !errors.Is(err, io.EOF) {
c.sendAlert(alertBadCertificate)
return nil, err
}
if n < len(rawMsg)-4 {
// If, after decompression, the specified length does not match the actual length, the party
// receiving the invalid message MUST abort the connection with the "bad_certificate" alert.
// https://datatracker.ietf.org/doc/html/rfc8879#section-4
c.sendAlert(alertBadCertificate)
return nil, fmt.Errorf("decompressed len (%d) does not match specified len (%d)", n, m.uncompressedLength)
}
certMsg := new(certificateMsgTLS13)
if !certMsg.unmarshal(rawMsg) {
return nil, c.sendAlert(alertUnexpectedMessage)
}
return certMsg, nil
}
// to be called in (*clientHandshakeStateTLS13).handshake(),
// after hs.readServerFinished() and before hs.sendClientCertificate()
func (hs *clientHandshakeStateTLS13) serverFinishedReceived() error {
if err := hs.sendClientEncryptedExtensions(); err != nil {
return err
}
return nil
}
func (hs *clientHandshakeStateTLS13) sendClientEncryptedExtensions() error {
c := hs.c
clientEncryptedExtensions := new(utlsClientEncryptedExtensionsMsg)
if c.utls.hasApplicationSettings {
clientEncryptedExtensions.hasApplicationSettings = true
clientEncryptedExtensions.applicationSettings = c.utls.localApplicationSettings
if _, err := c.writeHandshakeRecord(clientEncryptedExtensions, hs.transcript); err != nil {
return err
}
}
return nil
}
func (hs *clientHandshakeStateTLS13) utlsReadServerParameters(encryptedExtensions *encryptedExtensionsMsg) error {
hs.c.utls.hasApplicationSettings = encryptedExtensions.utls.hasApplicationSettings
hs.c.utls.peerApplicationSettings = encryptedExtensions.utls.applicationSettings
hs.c.utls.echRetryConfigs = encryptedExtensions.utls.echRetryConfigs
if hs.c.utls.hasApplicationSettings {
if hs.uconn.vers < VersionTLS13 {
return errors.New("tls: server sent application settings at invalid version")
}
if len(hs.uconn.clientProtocol) == 0 {
return errors.New("tls: server sent application settings without ALPN")
}
// Check if the ALPN selected by the server exists in the client's list.
if alps, ok := hs.uconn.config.ApplicationSettings[hs.serverHello.alpnProtocol]; ok {
hs.c.utls.localApplicationSettings = alps
} else {
// return errors.New("tls: server selected ALPN doesn't match a client ALPS")
return nil // ignore if client doesn't have ALPS in use.
// TODO: is this a issue or not?
}
}
if len(hs.c.utls.echRetryConfigs) > 0 {
if hs.uconn.vers < VersionTLS13 {
return errors.New("tls: server sent ECH retry configs at invalid version")
}
// find ECH extension in ClientHello
var echIncluded bool
for _, ext := range hs.uconn.Extensions {
if _, ok := ext.(ECHExtension); ok {
echIncluded = true
}
}
if !echIncluded {
return errors.New("tls: server sent ECH retry configs without client sending ECH extension")
}
}
return nil
}
func (c *Conn) makeClientHelloForApplyPreset() (*clientHelloMsg, clientKeySharePrivate, error) {
config := c.config
// [UTLS SECTION START]
if len(config.ServerName) == 0 && !config.InsecureSkipVerify && len(config.InsecureServerNameToVerify) == 0 {
return nil, nil, errors.New("tls: at least one of ServerName, InsecureSkipVerify or InsecureServerNameToVerify must be specified in the tls.Config")
}
// [UTLS SECTION END]
nextProtosLength := 0
for _, proto := range config.NextProtos {
if l := len(proto); l == 0 || l > 255 {
return nil, nil, errors.New("tls: invalid NextProtos value")
} else {
nextProtosLength += 1 + l
}
}
if nextProtosLength > 0xffff {
return nil, nil, errors.New("tls: NextProtos values too large")
}
supportedVersions := config.supportedVersions(roleClient)
if len(supportedVersions) == 0 {
return nil, nil, errors.New("tls: no supported versions satisfy MinVersion and MaxVersion")
}
clientHelloVersion := config.maxSupportedVersion(roleClient)
// The version at the beginning of the ClientHello was capped at TLS 1.2
// for compatibility reasons. The supported_versions extension is used
// to negotiate versions now. See RFC 8446, Section 4.2.1.
if clientHelloVersion > VersionTLS12 {
clientHelloVersion = VersionTLS12
}
hello := &clientHelloMsg{
vers: clientHelloVersion,
compressionMethods: []uint8{compressionNone},
random: make([]byte, 32),
extendedMasterSecret: true,
ocspStapling: true,
scts: true,
serverName: hostnameInSNI(config.ServerName),
supportedCurves: config.curvePreferences(),
supportedPoints: []uint8{pointFormatUncompressed},
secureRenegotiationSupported: true,
alpnProtocols: config.NextProtos,
supportedVersions: supportedVersions,
}
if c.handshakes > 0 {
hello.secureRenegotiation = c.clientFinished[:]
}
preferenceOrder := cipherSuitesPreferenceOrder
if !hasAESGCMHardwareSupport {
preferenceOrder = cipherSuitesPreferenceOrderNoAES
}
configCipherSuites := config.cipherSuites()
hello.cipherSuites = make([]uint16, 0, len(configCipherSuites))
for _, suiteId := range preferenceOrder {
suite := mutualCipherSuite(configCipherSuites, suiteId)
if suite == nil {
continue
}
// Don't advertise TLS 1.2-only cipher suites unless
// we're attempting TLS 1.2.
if hello.vers < VersionTLS12 && suite.flags&suiteTLS12 != 0 {
continue
}
hello.cipherSuites = append(hello.cipherSuites, suiteId)
}
_, err := io.ReadFull(config.rand(), hello.random)
if err != nil {
return nil, nil, errors.New("tls: short read from Rand: " + err.Error())
}
// A random session ID is used to detect when the server accepted a ticket
// and is resuming a session (see RFC 5077). In TLS 1.3, it's always set as
// a compatibility measure (see RFC 8446, Section 4.1.2).
//
// The session ID is not set for QUIC connections (see RFC 9001, Section 8.4).
if c.quic == nil {
hello.sessionId = make([]byte, 32)
if _, err := io.ReadFull(config.rand(), hello.sessionId); err != nil {
return nil, nil, errors.New("tls: short read from Rand: " + err.Error())
}
}
if hello.vers >= VersionTLS12 {
hello.supportedSignatureAlgorithms = supportedSignatureAlgorithms()
}
if testingOnlyForceClientHelloSignatureAlgorithms != nil {
hello.supportedSignatureAlgorithms = testingOnlyForceClientHelloSignatureAlgorithms
}
var secret clientKeySharePrivate // [UTLS]
if hello.supportedVersions[0] == VersionTLS13 {
// Reset the list of ciphers when the client only supports TLS 1.3.
if len(hello.supportedVersions) == 1 {
hello.cipherSuites = nil
}
if hasAESGCMHardwareSupport {
hello.cipherSuites = append(hello.cipherSuites, defaultCipherSuitesTLS13...)
} else {
hello.cipherSuites = append(hello.cipherSuites, defaultCipherSuitesTLS13NoAES...)
}
// curveID := config.curvePreferences()[0]
// // [UTLS SECTION BEGINS]
// // Ported from cloudflare/go with modifications to preserve crypto/tls compatibility
// if scheme := curveIdToCirclScheme(curveID); scheme != nil {
// pk, sk, err := generateKemKeyPair(scheme, curveID, config.rand())
// if err != nil {
// return nil, nil, fmt.Errorf("generateKemKeyPair %s: %w", scheme.Name(), err)
// }
// packedPk, err := pk.MarshalBinary()
// if err != nil {
// return nil, nil, fmt.Errorf("pack circl public key %s: %w", scheme.Name(), err)
// }
// hello.keyShares = []keyShare{{group: curveID, data: packedPk}}
// secret = sk
// } else {
// if _, ok := curveForCurveID(curveID); !ok {
// return nil, nil, errors.New("tls: CurvePreferences includes unsupported curve")
// }
// key, err := generateECDHEKey(config.rand(), curveID)
// if err != nil {
// return nil, nil, err
// }
// hello.keyShares = []keyShare{{group: curveID, data: key.PublicKey().Bytes()}}
// secret = key
// }
// // [UTLS SECTION ENDS]
}
// [UTLS] We don't need this, since it is not ready yet
// if c.quic != nil {
// p, err := c.quicGetTransportParameters()
// if err != nil {
// return nil, nil, err
// }
// if p == nil {
// p = []byte{}
// }
// hello.quicTransportParameters = p
// }
return hello, secret, nil
}