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fuzz.go
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fuzz.go
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package handshake
import (
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"fmt"
"log"
"github.com/lucas-clemente/quic-go/fuzzing/internal/helper"
"github.com/lucas-clemente/quic-go/internal/handshake"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/utils"
"github.com/lucas-clemente/quic-go/internal/wire"
)
var cert *tls.Certificate
var certPool *x509.CertPool
func init() {
priv, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
log.Fatal(err)
}
cert, certPool, err = helper.GenerateCertificate(priv)
if err != nil {
log.Fatal(err)
}
}
type messageType uint8
// TLS handshake message types.
const (
typeClientHello messageType = 1
typeServerHello messageType = 2
typeNewSessionTicket messageType = 4
typeEncryptedExtensions messageType = 8
typeCertificate messageType = 11
typeCertificateRequest messageType = 13
typeCertificateVerify messageType = 15
typeFinished messageType = 20
)
func (m messageType) String() string {
switch m {
case typeClientHello:
return "ClientHello"
case typeServerHello:
return "ServerHello"
case typeNewSessionTicket:
return "NewSessionTicket"
case typeEncryptedExtensions:
return "EncryptedExtensions"
case typeCertificate:
return "Certificate"
case typeCertificateRequest:
return "CertificateRequest"
case typeCertificateVerify:
return "CertificateVerify"
case typeFinished:
return "Finished"
default:
return fmt.Sprintf("unknown message type: %d", m)
}
}
type chunk struct {
data []byte
encLevel protocol.EncryptionLevel
}
type stream struct {
chunkChan chan<- chunk
encLevel protocol.EncryptionLevel
}
func (s *stream) Write(b []byte) (int, error) {
data := append([]byte{}, b...)
select {
case s.chunkChan <- chunk{data: data, encLevel: s.encLevel}:
default:
panic("chunkChan too small")
}
return len(b), nil
}
func initStreams() (chan chunk, *stream /* initial */, *stream /* handshake */) {
chunkChan := make(chan chunk, 10)
initialStream := &stream{chunkChan: chunkChan, encLevel: protocol.EncryptionInitial}
handshakeStream := &stream{chunkChan: chunkChan, encLevel: protocol.EncryptionHandshake}
return chunkChan, initialStream, handshakeStream
}
type handshakeRunner interface {
OnReceivedParams(*wire.TransportParameters)
OnHandshakeComplete()
OnError(error)
DropKeys(protocol.EncryptionLevel)
}
type runner struct {
errored bool
client, server *handshake.CryptoSetup
}
var _ handshakeRunner = &runner{}
func newRunner(client, server *handshake.CryptoSetup) *runner {
return &runner{client: client, server: server}
}
func (r *runner) OnReceivedParams(*wire.TransportParameters) {}
func (r *runner) OnHandshakeComplete() {}
func (r *runner) OnError(err error) {
if r.errored {
return
}
r.errored = true
(*r.client).Close()
(*r.server).Close()
}
func (r *runner) DropKeys(protocol.EncryptionLevel) {}
const alpn = "fuzzing"
func toEncryptionLevel(n uint8) protocol.EncryptionLevel {
switch n % 3 {
default:
return protocol.EncryptionInitial
case 1:
return protocol.EncryptionHandshake
case 2:
return protocol.Encryption1RTT
}
}
func maxEncLevel(cs handshake.CryptoSetup, encLevel protocol.EncryptionLevel) protocol.EncryptionLevel {
switch encLevel {
case protocol.EncryptionInitial:
return protocol.EncryptionInitial
case protocol.EncryptionHandshake:
// Handshake opener not available. We can't possibly read a Handshake handshake message.
if opener, err := cs.GetHandshakeOpener(); err != nil || opener == nil {
return protocol.EncryptionInitial
}
return protocol.EncryptionHandshake
case protocol.Encryption1RTT:
// 1-RTT opener not available. We can't possibly read a post-handshake message.
if opener, err := cs.Get1RTTOpener(); err != nil || opener == nil {
return maxEncLevel(cs, protocol.EncryptionHandshake)
}
return protocol.Encryption1RTT
default:
panic("unexpected encryption level")
}
}
// PrefixLen is the number of bytes used for configuration
const PrefixLen = 2
// Fuzz fuzzes the TLS 1.3 handshake used by QUIC.
//go:generate go run ./cmd/corpus.go
func Fuzz(data []byte) int {
if len(data) < PrefixLen {
return -1
}
enable0RTTClient := helper.NthBit(data[0], 0)
enable0RTTServer := helper.NthBit(data[0], 1)
useSessionTicketCache := helper.NthBit(data[0], 2)
sendPostHandshakeMessageToClient := helper.NthBit(data[0], 3)
sendPostHandshakeMessageToServer := helper.NthBit(data[0], 4)
messageToReplace := data[1] % 32
messageToReplaceEncLevel := toEncryptionLevel(data[1] >> 6)
data = data[PrefixLen:]
clientConf := &tls.Config{
ServerName: "localhost",
NextProtos: []string{alpn},
RootCAs: certPool,
}
if useSessionTicketCache {
clientConf.ClientSessionCache = tls.NewLRUClientSessionCache(5)
}
cChunkChan, cInitialStream, cHandshakeStream := initStreams()
var client, server handshake.CryptoSetup
runner := newRunner(&client, &server)
client, _ = handshake.NewCryptoSetupClient(
cInitialStream,
cHandshakeStream,
protocol.ConnectionID{},
nil,
nil,
&wire.TransportParameters{},
runner,
clientConf,
enable0RTTClient,
utils.NewRTTStats(),
nil,
utils.DefaultLogger.WithPrefix("client"),
)
sChunkChan, sInitialStream, sHandshakeStream := initStreams()
server = handshake.NewCryptoSetupServer(
sInitialStream,
sHandshakeStream,
protocol.ConnectionID{},
nil,
nil,
&wire.TransportParameters{},
runner,
&tls.Config{
Certificates: []tls.Certificate{*cert},
NextProtos: []string{alpn},
},
enable0RTTServer,
utils.NewRTTStats(),
nil,
utils.DefaultLogger.WithPrefix("server"),
)
if len(data) == 0 {
return -1
}
serverHandshakeCompleted := make(chan struct{})
go func() {
defer close(serverHandshakeCompleted)
server.RunHandshake()
}()
clientHandshakeCompleted := make(chan struct{})
go func() {
defer close(clientHandshakeCompleted)
client.RunHandshake()
}()
done := make(chan struct{})
go func() {
<-serverHandshakeCompleted
<-clientHandshakeCompleted
close(done)
}()
messageLoop:
for {
select {
case c := <-cChunkChan:
b := c.data
encLevel := c.encLevel
if len(b) > 0 && b[0] == messageToReplace {
fmt.Println("replacing message to the server", messageType(b[0]).String())
b = data
encLevel = maxEncLevel(server, messageToReplaceEncLevel)
}
server.HandleMessage(b, encLevel)
case c := <-sChunkChan:
b := c.data
encLevel := c.encLevel
if len(b) > 0 && b[0] == messageToReplace {
fmt.Println("replacing message to the client", messageType(b[0]).String())
b = data
encLevel = maxEncLevel(client, messageToReplaceEncLevel)
}
client.HandleMessage(b, encLevel)
case <-done: // test done
break messageLoop
}
if runner.errored {
break messageLoop
}
}
<-done
if runner.errored {
return 1
}
if sendPostHandshakeMessageToClient {
if _, err := server.GetSessionTicket(); err != nil {
panic(err)
}
client.HandleMessage(data, messageToReplaceEncLevel)
}
if sendPostHandshakeMessageToServer {
server.HandleMessage(data, messageToReplaceEncLevel)
}
return 1
}