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handshake fuzzer: fix setting of cipher suites (#4037)

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Marten Seemann 2023-08-17 12:26:36 +07:00 • committed by GitHub
parent 83c00a574d
commit 3822dae9bb
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1 changed files with 15 additions and 29 deletions
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44
fuzzing/handshake/fuzz.go
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@ -17,6 +17,7 @@ import (
"github.com/quic-go/quic-go/fuzzing/internal/helper"
"github.com/quic-go/quic-go/internal/handshake"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/qtls"
"github.com/quic-go/quic-go/internal/utils"
"github.com/quic-go/quic-go/internal/wire"
)
@ -84,33 +85,6 @@ func (m messageType) String() string {
}
}
func appendSuites(suites []uint16, rand uint8) []uint16 {
const (
s1 = tls.TLS_AES_128_GCM_SHA256
s2 = tls.TLS_AES_256_GCM_SHA384
s3 = tls.TLS_CHACHA20_POLY1305_SHA256
)
switch rand % 4 {
default:
return suites
case 1:
return append(suites, s1)
case 2:
return append(suites, s2)
case 3:
return append(suites, s3)
}
}
// consumes 2 bits
func getSuites(rand uint8) []uint16 {
suites := make([]uint16, 0, 3)
for i := 1; i <= 3; i++ {
suites = appendSuites(suites, rand>>i%4)
}
return suites
}
// consumes 3 bits
func getClientAuth(rand uint8) tls.ClientAuthType {
switch rand {
@ -207,14 +181,26 @@ func runHandshake(runConfig [confLen]byte, messageConfig uint8, clientConf *tls.
SessionTicketKey: sessionTicketKey,
}
// This sets the cipher suite for both client and server.
// The way crypto/tls is designed doesn't allow us to set different cipher suites for client and server.
resetCipherSuite := func() {}
switch (runConfig[0] >> 6) % 4 {
case 0:
resetCipherSuite = qtls.SetCipherSuite(tls.TLS_AES_128_GCM_SHA256)
case 1:
resetCipherSuite = qtls.SetCipherSuite(tls.TLS_AES_256_GCM_SHA384)
case 3:
resetCipherSuite = qtls.SetCipherSuite(tls.TLS_CHACHA20_POLY1305_SHA256)
default:
}
defer resetCipherSuite()
enable0RTTClient := helper.NthBit(runConfig[0], 0)
enable0RTTServer := helper.NthBit(runConfig[0], 1)
sendPostHandshakeMessageToClient := helper.NthBit(runConfig[0], 3)
sendPostHandshakeMessageToServer := helper.NthBit(runConfig[0], 4)
sendSessionTicket := helper.NthBit(runConfig[0], 5)
clientConf.CipherSuites = getSuites(runConfig[0] >> 6)
serverConf.ClientAuth = getClientAuth(runConfig[1] & 0b00000111)
serverConf.CipherSuites = getSuites(runConfig[1] >> 6)
serverConf.SessionTicketsDisabled = helper.NthBit(runConfig[1], 3)
if helper.NthBit(runConfig[2], 0) {
clientConf.RootCAs = x509.NewCertPool()