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handshake fuzzer: fix TLS handshake sequence (#4033)

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There were two problems with the existing code:
1. The transport parameters were rejected due to an invalid value for
   ActiveConnectionIDLimit, causing the handshake to fail.
2. Handshake messages were passed in at the wrong encryption level,
   leading to consistent handshake failures.
This commit is contained in:
Marten Seemann 2023-08-16 20:55:44 +07:00 • committed by GitHub
parent ca3842d6c8
commit 51d257d608
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 19 additions and 4 deletions
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23
fuzzing/handshake/fuzz.go
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@ -147,6 +147,7 @@ func getTransportParameters(seed uint8) *wire.TransportParameters {
const maxVarInt = math.MaxUint64 / 4
r := mrand.New(mrand.NewSource(int64(seed)))
return &wire.TransportParameters{
ActiveConnectionIDLimit: 2,
InitialMaxData: protocol.ByteCount(r.Int63n(maxVarInt)),
InitialMaxStreamDataBidiLocal: protocol.ByteCount(r.Int63n(maxVarInt)),
InitialMaxStreamDataBidiRemote: protocol.ByteCount(r.Int63n(maxVarInt)),
@ -302,6 +303,7 @@ func runHandshake(runConfig [confLen]byte, messageConfig uint8, clientConf *tls.
if err := client.StartHandshake(); err != nil {
log.Fatal(err)
}
defer client.Close()
server := handshake.NewCryptoSetupServer(
protocol.ConnectionID{},
@ -318,12 +320,13 @@ func runHandshake(runConfig [confLen]byte, messageConfig uint8, clientConf *tls.
if err := server.StartHandshake(); err != nil {
log.Fatal(err)
}
defer server.Close()
var clientHandshakeComplete, serverHandshakeComplete bool
for {
var processedEvent bool
clientLoop:
for {
var processedEvent bool
ev := client.NextEvent()
//nolint:exhaustive // only need to process a few events
switch ev.Kind {
@ -334,11 +337,16 @@ func runHandshake(runConfig [confLen]byte, messageConfig uint8, clientConf *tls.
break clientLoop
case handshake.EventWriteInitialData, handshake.EventWriteHandshakeData:
msg := ev.Data
encLevel := protocol.EncryptionInitial
if ev.Kind == handshake.EventWriteHandshakeData {
encLevel = protocol.EncryptionHandshake
}
if msg[0] == messageToReplace {
fmt.Printf("replacing %s message to the server with %s at %s\n", messageType(msg[0]), messageType(data[0]), messageToReplaceEncLevel)
msg = data
encLevel = messageToReplaceEncLevel
}
if err := server.HandleMessage(msg, messageToReplaceEncLevel); err != nil {
if err := server.HandleMessage(msg, encLevel); err != nil {
return 1
}
case handshake.EventHandshakeComplete:
@ -347,9 +355,9 @@ func runHandshake(runConfig [confLen]byte, messageConfig uint8, clientConf *tls.
processedEvent = true
}
processedEvent = false
serverLoop:
for {
var processedEvent bool
ev := server.NextEvent()
//nolint:exhaustive // only need to process a few events
switch ev.Kind {
@ -359,12 +367,17 @@ func runHandshake(runConfig [confLen]byte, messageConfig uint8, clientConf *tls.
}
break serverLoop
case handshake.EventWriteInitialData, handshake.EventWriteHandshakeData:
encLevel := protocol.EncryptionInitial
if ev.Kind == handshake.EventWriteHandshakeData {
encLevel = protocol.EncryptionHandshake
}
msg := ev.Data
if msg[0] == messageToReplace {
fmt.Printf("replacing %s message to the client with %s at %s\n", messageType(msg[0]), messageType(data[0]), messageToReplaceEncLevel)
msg = data
encLevel = messageToReplaceEncLevel
}
if err := client.HandleMessage(msg, messageToReplaceEncLevel); err != nil {
if err := client.HandleMessage(msg, encLevel); err != nil {
return 1
}
case handshake.EventHandshakeComplete:
@ -410,9 +423,11 @@ func runHandshake(runConfig [confLen]byte, messageConfig uint8, clientConf *tls.
client.HandleMessage(ticket, protocol.Encryption1RTT)
}
if sendPostHandshakeMessageToClient {
fmt.Println("sending post handshake message to the client at", messageToReplaceEncLevel)
client.HandleMessage(data, messageToReplaceEncLevel)
}
if sendPostHandshakeMessageToServer {
fmt.Println("sending post handshake message to the server at", messageToReplaceEncLevel)
server.HandleMessage(data, messageToReplaceEncLevel)
}