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connection.go
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connection.go
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package quictracker
import (
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
"github.com/QUIC-Tracker/quic-tracker/qlog"
"github.com/mpiraux/pigotls"
"log"
r "math/rand"
"net"
"os"
"sort"
"strings"
"sync"
"time"
"unsafe"
)
var R *r.Rand
var FuzzSession bool = false
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890?/><:{}\\()*&^%$#@!_+=,.;'[]"
type Connection struct {
ServerName string
UdpConnection *net.UDPConn
UseIPv6 bool
Host *net.UDPAddr
InterfaceMTU int
Tls *pigotls.Connection
TLSTPHandler *TLSTransportParameterHandler
KeyPhaseIndex uint
SpinBit SpinBit
LastSpinNumber PacketNumber
CryptoStateLock sync.Locker
CryptoStates map[EncryptionLevel]*CryptoState
ReceivedPacketHandler func([]byte, unsafe.Pointer)
SentPacketHandler func([]byte, unsafe.Pointer)
CryptoStreams CryptoStreams // TODO: It should be a parent class without closing states
Streams Streams
IncomingPackets Broadcaster //type: Packet
OutgoingPackets Broadcaster //type: Packet
IncomingPayloads Broadcaster //type: IncomingPayload
UnprocessedPayloads Broadcaster //type: UnprocessedPayload
EncryptionLevels Broadcaster //type: DirectionalEncryptionLevel
FrameQueue Broadcaster //type: QueuedFrame
TransportParameters Broadcaster //type: QuicTransportParameters
PreparePacket Broadcaster //type: EncryptionLevel
SendPacket Broadcaster //type: PacketToSend
StreamInput Broadcaster //type: StreamInput
PacketAcknowledged Broadcaster //type: PacketAcknowledged
ConnectionClosed chan bool
ConnectionRestart chan bool // Triggered when receiving a Retry or a VN packet
ConnectionRestarted chan bool
OriginalDestinationCID ConnectionID
SourceCID ConnectionID
DestinationCID ConnectionID
Version uint32
ALPN string
Token []byte
ResumptionTicket []byte
PacketNumberLock sync.Locker
PacketNumber map[PNSpace]PacketNumber // Stores the next PN to be sent
LargestPNsReceived map[PNSpace]PacketNumber // Stores the largest PN received
LargestPNsAcknowledged map[PNSpace]PacketNumber // Stores the largest PN we have sent that were acknowledged by the peer
MinRTT uint64
SmoothedRTT uint64
RTTVar uint64
AckQueue map[PNSpace][]PacketNumber // Stores the packet numbers to be acked TODO: This should be a channel actually
Logger *log.Logger
QLog qlog.QLog
QLogTrace *qlog.Trace
QLogEvents chan *qlog.Event
}
func (c *Connection) ConnectedIp() net.Addr {
return c.UdpConnection.RemoteAddr()
}
func (c *Connection) nextPacketNumber(space PNSpace) PacketNumber { // TODO: This should be thread safe
c.PacketNumberLock.Lock()
pn := c.PacketNumber[space]
c.PacketNumber[space]++
c.PacketNumberLock.Unlock()
return pn
}
func (c *Connection) CryptoState(level EncryptionLevel) *CryptoState {
c.CryptoStateLock.Lock()
cs, ok := c.CryptoStates[level]
c.CryptoStateLock.Unlock()
if ok {
return cs
}
return nil
}
func RandStringBytes(n int) []byte {
b := make([]byte, n)
for i := range b {
b[i] = letterBytes[R.Intn(len(letterBytes))]
}
return b
}
var MinMaxError = errors.New("Min cannot be greater than max.")
// IntRange returns a random integer in the range from min to max.
func IntRange(min, max int) (int, error) {
var result int
switch {
case min > max:
// Fail with error
return result, MinMaxError
case max == min:
result = max
case max > min:
maxRand := max - min
b := R.Intn(maxRand)
result = min + int(b)
}
return result, nil
}
type Choice struct {
Weight int
Item interface{}
}
func WeightedChoice(choices []Choice) (Choice, error) {
var ret Choice
sum := 0
for _, c := range choices {
sum += c.Weight
}
r, err := IntRange(0, sum)
if err != nil {
return ret, err
}
for _, c := range choices {
r -= c.Weight
if r < 0 {
return c, nil
}
}
err = errors.New("Internal error - code should not reach this point")
return ret, err
}
func fuzz_individual_frame(frame *Frame) {
switch (*frame).FrameType() {
case PaddingFrameType:
// fmt.Println("Can't fuzz padding frame")
case PingType:
// fmt.Println("Can't fuzz ping frame")
case AckType:
fmt.Println("Fuzzing ACK Frame")
ack_fields := []Choice{{1, "LargestAcknowledged"}, {1, "AckDelay"}, {1, "AckRangeCount"}, {1, "AckRanges"}}
// num := R.Intn(4)
for i := 0; i < 4; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(ack_fields); fuzz_field.Item {
case "LargestAcknowledged":
(*frame).(*AckFrame).LargestAcknowledged = PacketNumber(uint64(R.Uint32()))
case "AckDelay":
(*frame).(*AckFrame).AckDelay = uint64(R.Uint32())
case "AckRangeCount":
(*frame).(*AckFrame).AckRangeCount = uint64(R.Uint32())
case "AckRanges":
for i, _ := range (*frame).(*AckFrame).AckRanges {
(*frame).(*AckFrame).AckRanges[i].Gap = uint64(R.Uint32())
(*frame).(*AckFrame).AckRanges[i].AckRange = uint64(R.Uint32())
}
}
}
}
case AckECNType:
case ResetStreamType:
fmt.Println("Fuzzing Reset Stream")
reset_fields := []Choice{{1, "StreamId"}, {1, "ApplicationErrorCode"}, {1, "FinalSize"}}
for i := 0; i < 3; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(reset_fields); fuzz_field.Item {
//we don't fuzz stream id as it is an easy check which can be used to drop packets
// case "StreamId":
// (*frame).(*ResetStream).StreamId = uint64(R.Uint32())
case "ApplicationErrorCode":
(*frame).(*ResetStream).ApplicationErrorCode = uint64(R.Uint32())
case "FinalSize":
(*frame).(*ResetStream).FinalSize = uint64(R.Uint32())
}
}
}
case StopSendingType:
fmt.Println("Fuzzing Stopsending frame")
stop_fields := []Choice{{1, "StreamId"}, {1, "ApplicationErrorCode"}}
for i := 0; i < 2; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(stop_fields); fuzz_field.Item {
case "StreamId":
(*frame).(*StopSendingFrame).StreamId = uint64(R.Uint32())
case "ApplicationErrorCode":
(*frame).(*StopSendingFrame).ApplicationErrorCode = uint64(R.Uint32())
}
}
}
case CryptoType:
//fuzzing the crypto frame might stop the handshake from getting completed. Should we fuzz it anyway ?
fmt.Println("Fuzzing Crypto frame")
crypto_fields := []Choice{{1, "Offset"}, {1, "Length"}, {1, "CryptoData"}}
for i := 0; i < 3; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(crypto_fields); fuzz_field.Item {
case "Offset":
(*frame).(*CryptoFrame).Offset = uint64(R.Uint32())
//should we fuzz the next two fields ?
case "Length":
case "CryptoData":
}
}
}
case NewTokenType:
case StreamType:
fmt.Println("Fuzzing Stream Frame")
stream_fields := []Choice{{1, "FinBit"}, {1, "LenBit"}, {1, "OffBit"}, {1, "StreamId"}, {1, "Offset"}, {1, "Length"}, {1, "StreamData"}}
// num := R.Intn(7)
for i := 0; i < 7; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(stream_fields); fuzz_field.Item {
case "FinBit":
(*frame).(*StreamFrame).FinBit = R.Float32() < 0.5
case "LenBit":
(*frame).(*StreamFrame).LenBit = R.Float32() < 0.5
case "OffBit":
(*frame).(*StreamFrame).OffBit = R.Float32() < 0.5
//we don't fuzz stream id as it is an easy check which can be used to drop packets
// case "StreamId":
// (*frame).(*StreamFrame).StreamId = uint64(R.Uint32())
case "Offset":
(*frame).(*StreamFrame).Offset = uint64(R.Uint32())
case "Length":
//does it make sense to fuzz both the length field and the stream data field ? It will definitely lead to a conflict
(*frame).(*StreamFrame).Length = uint64(R.Uint32())
case "StreamData":
token := make([]byte, len((*frame).(*StreamFrame).StreamData))
R.Read(token)
(*frame).(*StreamFrame).StreamData = token
}
}
}
case MaxDataType:
fmt.Println("Fuzzing MaxData frame")
maxData_fields := []Choice{{1, "MaximumData"}}
for i := 0; i < 1; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(maxData_fields); fuzz_field.Item {
case "MaximumData":
(*frame).(*MaxDataFrame).MaximumData = uint64(R.Uint32())
}
}
}
case MaxStreamDataType:
fmt.Println("Fuzzing MaxStreamData frame")
maxStreamData_fields := []Choice{{1, "StreamId"}, {1, "MaximumData"}}
for i := 0; i < 2; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(maxStreamData_fields); fuzz_field.Item {
case "StreamId":
(*frame).(*MaxStreamDataFrame).StreamId = uint64(R.Uint32())
case "MaximumData":
(*frame).(*MaxStreamDataFrame).MaximumStreamData = uint64(R.Uint32())
}
}
}
case MaxStreamsType:
fmt.Println("Fuzzing MaxStreams frame")
maxStream_fields := []Choice{{1, "StreamType"}, {1, "MaximumStreams"}}
for i := 0; i < 2; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(maxStream_fields); fuzz_field.Item {
case "StreamType":
(*frame).(*MaxStreamsFrame).StreamsType = R.Float32() < 0.5
case "MaximumStreams":
(*frame).(*MaxStreamsFrame).MaximumStreams = uint64(R.Uint32())
}
}
}
case DataBlockedType:
fmt.Println("Fuzzing DataBlocked frame")
dataBlocked_fields := []Choice{{1, "DataLimit"}}
for i := 0; i < 1; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(dataBlocked_fields); fuzz_field.Item {
case "DataLimit":
(*frame).(*DataBlockedFrame).DataLimit = uint64(R.Uint32())
}
}
}
case StreamDataBlockedType:
fmt.Println("Fuzzing StreamDataBlocked frame")
streamDataBlocked_fields := []Choice{{1, "StreamId"}, {1, "StreamDataLimit"}}
for i := 0; i < 2; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(streamDataBlocked_fields); fuzz_field.Item {
//we don't fuzz stream id as it is an easy check which can be used to drop packets
// case "StreamId":
// (*frame).(*StreamDataBlockedFrame).StreamId = uint64(R.Uint32())
case "StreamDataLimit":
(*frame).(*StreamDataBlockedFrame).StreamDataLimit = uint64(R.Uint32())
}
}
}
case StreamsBlockedType:
fmt.Println("Fuzzing StreamsBlocked frame")
streamBlocked_fields := []Choice{{1, "StreamsType"}, {1, "StreamLimit"}}
for i := 0; i < 2; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(streamBlocked_fields); fuzz_field.Item {
case "StreamsType":
(*frame).(*StreamsBlockedFrame).StreamsType = R.Float32() < 0.5
case "StreamLimit":
(*frame).(*StreamsBlockedFrame).StreamLimit = uint64(R.Uint32())
}
}
}
case NewConnectionIdType:
fmt.Println("Fuzzing NewConnectionId frame")
nConId_fields := []Choice{{1, "Sequence"}, {1, "RetirePriorTo"}, {1, "Length"}, {1, "ConnectionId"}, {1, "StatelessResetToken"}}
for i := 0; i < 5; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(nConId_fields); fuzz_field.Item {
case "Sequence":
(*frame).(*NewConnectionIdFrame).Sequence = uint64(R.Uint32())
case "RetirePriorTo":
(*frame).(*NewConnectionIdFrame).RetirePriorTo = uint64(R.Uint32())
case "Length":
(*frame).(*NewConnectionIdFrame).Length = uint8(R.Intn(255))
case "ConnectionId":
case "StatelessResetToken":
for j := 0; j < 16; j++ {
token := make([]byte, 1)
R.Read(token)
(*frame).(*NewConnectionIdFrame).StatelessResetToken[j] = token[0]
}
}
}
}
case RetireConnectionIdType:
fmt.Println("Fuzzing RetireConnectionId frame")
fields := []Choice{{1, "SequenceNumber"}}
for i := 0; i < 1; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(fields); fuzz_field.Item {
case "SequenceNumber":
(*frame).(*RetireConnectionId).SequenceNumber = uint64(R.Uint32())
}
}
}
case PathChallengeType:
fmt.Println("Fuzzing PathChallenge frame")
fields := []Choice{{1, "Data"}}
for i := 0; i < 1; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(fields); fuzz_field.Item {
case "Data":
for j := 0; j < 16; j++ {
token := make([]byte, 1)
R.Read(token)
(*frame).(*PathChallenge).Data[j] = token[0]
}
}
}
}
case PathResponseType:
fmt.Println("Fuzzing PathResponse frame")
fields := []Choice{{1, "Data"}}
for i := 0; i < 1; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(fields); fuzz_field.Item {
case "Data":
for j := 0; j < 16; j++ {
token := make([]byte, 1)
R.Read(token)
(*frame).(*PathResponse).Data[j] = token[0]
}
}
}
}
case ConnectionCloseType:
fmt.Println("Fuzzing ConnectionClose frame")
fields := []Choice{{1, "ErrorCode"}, {1, "ErrorFrameType"}, {1, "ReasonPhraseLength"}, {1, "ReasonPhrase"}}
for i := 0; i < 4; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(fields); fuzz_field.Item {
case "ErrorCode":
(*frame).(*ConnectionCloseFrame).ErrorCode = uint64(R.Uint32())
case "ErrorFrameType":
(*frame).(*ConnectionCloseFrame).ErrorFrameType = uint64(R.Uint32())
case "ReasonPhraseLength":
(*frame).(*ConnectionCloseFrame).ReasonPhraseLength = uint64(R.Uint32())
case "ReasonPhrase":
//could this lead to memory overlap problems ?
// (*frame).(*ConnectionCloseFrame).ReasonPhrase = string(RandStringBytes(R.Intn(100)))
}
}
}
case ApplicationCloseType:
fmt.Println("Fuzzing ApplicationClose frame")
fields := []Choice{{1, "errorCode"}, {1, "reasonPhraseLength"}, {1, "reasonPhrase"}}
for i := 0; i < 3; i++ {
if fuzz_decision := R.Float32() < 0.5; fuzz_decision {
switch fuzz_field, _ := WeightedChoice(fields); fuzz_field.Item {
case "errorCode":
(*frame).(*ApplicationCloseFrame).ErrorCode = uint64(R.Uint32())
case "reasonPhraseLength":
(*frame).(*ApplicationCloseFrame).ReasonPhraseLength = uint64(R.Uint32())
case "reasonPhrase":
//could this lead to memory overlap problems ?
// (*frame).(*ApplicationCloseFrame).reasonPhrase = string(RandStringBytes(R.Intn(100)))
}
}
}
case HandshakeDoneType:
}
}
func fuzz_payload(payload []byte) []byte {
fmt.Println("fuzzing payload")
list := [3]string{"repeat_payload", "alter_payload", "add_random_payload"}
//test whether math/rand is the right choice for our purpose or not
index := R.Intn(3)
switch list[index] {
case "repeat_payload":
fmt.Println("repeating payload")
payload = append(payload, payload...)
case "alter_payload":
fmt.Println("altering payload")
for i, _ := range payload {
fuzz_decision := R.Float32() < 0.5
switch fuzz_decision {
case true:
token := make([]byte, 1)
R.Read(token)
payload[i] = token[0]
}
}
case "add_random_payload":
fmt.Println("adding random payload")
rand_payload := RandStringBytes(R.Intn(200))
fmt.Println(rand_payload)
payload = append(payload, rand_payload...)
}
return payload
}
func fuzz_frame(packet *Packet, level EncryptionLevel) {
//need to add cases for packets like
fmt.Println("fuzzing frame")
frames := (*packet).(Framer).GetFrames()
for i, _ := range frames {
fuzz_decision := R.Float32() < 0.5
if fuzz_decision == true {
fuzz_individual_frame(&((*packet).(Framer).GetFrames()[i]))
}
// fmt.Println(f.FrameType())
}
}
func (c *Connection) EncodeAndEncrypt(packet Packet, level EncryptionLevel) []byte {
switch packet.PNSpace() {
case PNSpaceInitial, PNSpaceHandshake, PNSpaceAppData:
cryptoState := c.CryptoState(level)
payload := packet.EncodePayload()
if h, ok := packet.Header().(*LongHeader); ok {
h.Length = NewVarInt(uint64(h.TruncatedPN().Length + len(payload) + cryptoState.Write.Overhead()))
}
header := packet.EncodeHeader()
protectedPayload := cryptoState.Write.Encrypt(payload, uint64(packet.Header().PacketNumber()), header)
packetBytes := append(header, protectedPayload...)
firstByteMask := byte(0x1F)
if packet.Header().PacketType() != ShortHeaderPacket {
firstByteMask = 0x0F
}
sample, pnOffset := GetPacketSample(packet.Header(), packetBytes)
mask := cryptoState.HeaderWrite.Encrypt(sample, make([]byte, 5, 5))
packetBytes[0] ^= mask[0] & firstByteMask
for i := 0; i < packet.Header().TruncatedPN().Length; i++ {
packetBytes[pnOffset+i] ^= mask[1+i]
}
return packetBytes
default:
// Clients do not send cleartext packets
}
return nil
}
func (c *Connection) EncodeAndEncryptFuzz(packet Packet, level EncryptionLevel) []byte {
fuzz_decision := R.Float32() < 0.5
options := []Choice{{1, "fuzz_payload"}, {2, "fuzz_frame"}}
val, err := WeightedChoice(options)
if err != nil {
fmt.Println(err.Error())
}
fmt.Println(val.Item)
if val.Item == "fuzz_frame" && fuzz_decision == true && FuzzSession == true && packet.PNSpace() == PNSpaceAppData {
fuzz_frame(&packet, level)
}
switch packet.PNSpace() {
case PNSpaceInitial, PNSpaceHandshake, PNSpaceAppData:
cryptoState := c.CryptoState(level)
payload := packet.EncodePayload()
if val.Item == "fuzz_payload" && fuzz_decision == true && FuzzSession == true && packet.PNSpace() == PNSpaceAppData {
payload = fuzz_payload(payload)
}
if h, ok := packet.Header().(*LongHeader); ok {
h.Length = NewVarInt(uint64(h.TruncatedPN().Length + len(payload) + cryptoState.Write.Overhead()))
}
header := packet.EncodeHeader()
protectedPayload := cryptoState.Write.Encrypt(payload, uint64(packet.Header().PacketNumber()), header)
packetBytes := append(header, protectedPayload...)
firstByteMask := byte(0x1F)
if packet.Header().PacketType() != ShortHeaderPacket {
firstByteMask = 0x0F
}
sample, pnOffset := GetPacketSample(packet.Header(), packetBytes)
mask := cryptoState.HeaderWrite.Encrypt(sample, make([]byte, 5, 5))
packetBytes[0] ^= mask[0] & firstByteMask
for i := 0; i < packet.Header().TruncatedPN().Length; i++ {
packetBytes[pnOffset+i] ^= mask[1+i]
}
return packetBytes
default:
// Clients do not send cleartext packets
}
return nil
}
func (c *Connection) PacketWasSent(packet Packet) {
if c.SentPacketHandler != nil {
c.SentPacketHandler(packet.Encode(packet.EncodePayload()), packet.Pointer())
}
c.OutgoingPackets.Submit(packet)
}
func (c *Connection) DoSendPacket(packet Packet, level EncryptionLevel) {
switch packet.PNSpace() {
case PNSpaceInitial, PNSpaceHandshake, PNSpaceAppData:
c.Logger.Printf("Sending packet {type=%s, number=%d}\n", packet.Header().PacketType().String(), packet.Header().PacketNumber())
packetBytes := c.EncodeAndEncrypt(packet, level)
c.UdpConnection.Write(packetBytes)
packet.SetSendContext(PacketContext{Timestamp: time.Now(), RemoteAddr: c.UdpConnection.RemoteAddr(), DatagramSize: uint16(len(packetBytes)), PacketSize: uint16(len(packetBytes))})
c.PacketWasSent(packet)
default:
// Clients do not send cleartext packets
}
}
func (c *Connection) DoSendPacketFuzz(packet Packet, level EncryptionLevel) {
switch packet.PNSpace() {
case PNSpaceInitial, PNSpaceHandshake, PNSpaceAppData:
c.Logger.Printf("Sending packet {type=%s, number=%d}\n", packet.Header().PacketType().String(), packet.Header().PacketNumber())
packetBytes := c.EncodeAndEncryptFuzz(packet, level)
c.UdpConnection.Write(packetBytes)
packet.SetSendContext(PacketContext{Timestamp: time.Now(), RemoteAddr: c.UdpConnection.RemoteAddr(), DatagramSize: uint16(len(packetBytes)), PacketSize: uint16(len(packetBytes))})
c.PacketWasSent(packet)
default:
// Clients do not send cleartext packets
}
}
//Experimental function: Designed for modular fuzzer
func (c *Connection) EncodeAndEncryptFuzzedPacket(packet Packet, payload []byte, level EncryptionLevel) []byte {
switch packet.PNSpace() {
case PNSpaceInitial, PNSpaceHandshake, PNSpaceAppData:
cryptoState := c.CryptoState(level)
// payload := packet.EncodePayload()
if h, ok := packet.Header().(*LongHeader); ok {
h.Length = NewVarInt(uint64(h.TruncatedPN().Length + len(payload) + cryptoState.Write.Overhead()))
}
header := packet.EncodeHeader()
protectedPayload := cryptoState.Write.Encrypt(payload, uint64(packet.Header().PacketNumber()), header)
packetBytes := append(header, protectedPayload...)
firstByteMask := byte(0x1F)
if packet.Header().PacketType() != ShortHeaderPacket {
firstByteMask = 0x0F
}
sample, pnOffset := GetPacketSample(packet.Header(), packetBytes)
mask := cryptoState.HeaderWrite.Encrypt(sample, make([]byte, 5, 5))
packetBytes[0] ^= mask[0] & firstByteMask
for i := 0; i < packet.Header().TruncatedPN().Length; i++ {
packetBytes[pnOffset+i] ^= mask[1+i]
}
return packetBytes
default:
// Clients do not send cleartext packets
}
return nil
}
//Experimental function: Designed for modular fuzzer
func (c *Connection) SendFuzzedPacket(packet Packet, payload []byte, level EncryptionLevel) {
switch packet.PNSpace() {
case PNSpaceInitial, PNSpaceHandshake, PNSpaceAppData:
c.Logger.Printf("Sending packet {type=%s, number=%d}\n", packet.Header().PacketType().String(), packet.Header().PacketNumber())
packetBytes := c.EncodeAndEncryptFuzzedPacket(packet, payload, level)
c.UdpConnection.Write(packetBytes)
packet.SetSendContext(PacketContext{Timestamp: time.Now(), RemoteAddr: c.UdpConnection.RemoteAddr(), DatagramSize: uint16(len(packetBytes)), PacketSize: uint16(len(packetBytes))})
c.PacketWasSent(packet)
default:
// Clients do not send cleartext packets
}
}
func (c *Connection) GetInitialPacket() *InitialPacket {
extensionData, err := c.TLSTPHandler.GetExtensionData()
if err != nil {
println(err)
return nil
}
c.Tls.SetQUICTransportParameters(extensionData)
tlsOutput, notComplete, err := c.Tls.HandleMessage(nil, pigotls.EpochInitial)
if err != nil || !notComplete {
println(err.Error())
return nil
}
clientHello := tlsOutput[0].Data
cryptoFrame := NewCryptoFrame(c.CryptoStreams.Get(PNSpaceInitial), clientHello)
if len(c.Tls.ZeroRTTSecret()) > 0 {
c.Logger.Printf("0-RTT secret is available, installing crypto state")
c.CryptoStateLock.Lock()
c.CryptoStates[EncryptionLevel0RTT] = NewProtectedCryptoState(c.Tls, nil, c.Tls.ZeroRTTSecret())
c.CryptoStateLock.Unlock()
c.EncryptionLevels.Submit(DirectionalEncryptionLevel{EncryptionLevel: EncryptionLevel0RTT, Read: false, Available: true})
}
var initialLength int
if c.UseIPv6 {
initialLength = MinimumInitialLengthv6
} else {
initialLength = MinimumInitialLength
}
initialPacket := NewInitialPacket(c)
initialPacket.Frames = append(initialPacket.Frames, cryptoFrame)
initialPacket.PadTo(initialLength - c.CryptoState(EncryptionLevelInitial).Write.Overhead())
return initialPacket
}
func (c *Connection) ProcessVersionNegotation(vn *VersionNegotiationPacket) error {
var version uint32
for _, v := range vn.SupportedVersions {
if v >= MinimumVersion && v <= MaximumVersion {
version = uint32(v)
}
}
if version == 0 {
c.Logger.Println("No appropriate version was found in the VN packet")
c.Logger.Printf("Versions received: %v\n", vn.SupportedVersions)
return errors.New("no appropriate version found")
}
QuicVersion = version
QuicALPNToken = fmt.Sprintf("%s-%02d", strings.Split(c.ALPN, "-")[0], version&0xff)
_, err := rand.Read(c.DestinationCID)
c.TransitionTo(QuicVersion, QuicALPNToken)
return err
}
func (c *Connection) GetAckFrame(space PNSpace) *AckFrame { // Returns an ack frame based on the packet numbers received
sort.Sort(PacketNumberQueue(c.AckQueue[space]))
packetNumbers := make([]PacketNumber, 0, len(c.AckQueue[space]))
if len(c.AckQueue[space]) > 0 {
last := c.AckQueue[space][0]
packetNumbers = append(packetNumbers, last)
for _, i := range c.AckQueue[space] {
if i != last {
last = i
packetNumbers = append(packetNumbers, i)
}
}
}
if len(packetNumbers) == 0 {
return nil
}
frame := new(AckFrame)
frame.AckRanges = make([]AckRange, 0, 255)
frame.LargestAcknowledged = packetNumbers[0]
previous := frame.LargestAcknowledged
ackBlock := AckRange{}
for _, number := range packetNumbers[1:] {
if previous-number == 1 {
ackBlock.AckRange++
} else {
frame.AckRanges = append(frame.AckRanges, ackBlock)
ackBlock = AckRange{uint64(previous) - uint64(number) - 2, 0}
}
previous = number
}
frame.AckRanges = append(frame.AckRanges, ackBlock)
if len(frame.AckRanges) > 0 {
frame.AckRangeCount = uint64(len(frame.AckRanges) - 1)
}
return frame
}
func (c *Connection) TransitionTo(version uint32, ALPN string) {
c.TLSTPHandler = NewTLSTransportParameterHandler()
c.Version = version
c.ALPN = ALPN
c.Tls = pigotls.NewConnection(c.ServerName, c.ALPN, c.ResumptionTicket)
c.PacketNumberLock = &sync.Mutex{}
c.PacketNumber = make(map[PNSpace]PacketNumber)
c.LargestPNsReceived = make(map[PNSpace]PacketNumber)
c.LargestPNsAcknowledged = make(map[PNSpace]PacketNumber)
c.AckQueue = make(map[PNSpace][]PacketNumber)
for _, space := range []PNSpace{PNSpaceInitial, PNSpaceHandshake, PNSpaceAppData} {
c.PacketNumber[space] = 0
c.AckQueue[space] = nil
}
c.CryptoStateLock = &sync.Mutex{}
c.CryptoStateLock.Lock()
c.CryptoStates = make(map[EncryptionLevel]*CryptoState)
c.CryptoStreams = make(map[PNSpace]*Stream)
c.CryptoStates[EncryptionLevelInitial] = NewInitialPacketProtection(c)
c.CryptoStateLock.Unlock()
c.Streams = Streams{streams: make(map[uint64]*Stream), lock: &sync.Mutex{}, input: &c.StreamInput}
}
func (c *Connection) CloseConnection(quicLayer bool, errCode uint64, reasonPhrase string) {
if quicLayer {
c.FrameQueue.Submit(QueuedFrame{&ConnectionCloseFrame{errCode, 0, uint64(len(reasonPhrase)), reasonPhrase}, EncryptionLevelBest})
} else {
c.FrameQueue.Submit(QueuedFrame{&ApplicationCloseFrame{errCode, uint64(len(reasonPhrase)), reasonPhrase}, EncryptionLevelBest})
}
}
func (c *Connection) SendHTTP09GETRequest(path string, streamID uint64) {
c.Streams.Send(streamID, []byte(fmt.Sprintf("GET %s\r\n", path)), true)
}
func (c *Connection) Close() {
c.Tls.Close()
c.UdpConnection.Close()
}
func EstablishUDPConnection(addr *net.UDPAddr) (*net.UDPConn, error) {
udpConn, err := net.DialUDP(addr.Network(), nil, addr)
if err != nil {
return nil, err
}
return udpConn, nil
}
func NewDefaultConnection(address string, serverName string, resumptionTicket []byte, useIPv6 bool, preferredALPN string, negotiateHTTP3 bool) (*Connection, error) {
scid := make([]byte, 8, 8)
dcid := make([]byte, 8, 8)
rand.Read(scid)
rand.Read(dcid)
var network string
if useIPv6 {
network = "udp6"
} else {
network = "udp4"
}
udpAddr, err := net.ResolveUDPAddr(network, address)
if err != nil {
return nil, err
}
udpConn, err := EstablishUDPConnection(udpAddr)
if err != nil {
return nil, err
}
var c *Connection
if negotiateHTTP3 {
c = NewConnection(serverName, QuicVersion, QuicH3ALPNToken, scid, dcid, udpConn, resumptionTicket)
} else {
QuicALPNToken = fmt.Sprintf("%s-%02d", preferredALPN, QuicVersion&0xff)
c = NewConnection(serverName, QuicVersion, QuicALPNToken, scid, dcid, udpConn, resumptionTicket)
}
var headerOverhead = 8
if useIPv6 {
headerOverhead += 40
} else {
headerOverhead += 20
}
lAddr := udpConn.LocalAddr().(*net.UDPAddr)
itfs, err := net.Interfaces()
if err != nil {
return nil, err
}
findMTU:
for _, e := range itfs {
addrs, err := e.Addrs()
if err != nil {
return nil, err
}
for _, a := range addrs {
switch ipNet := a.(type) {
case *net.IPNet:
if ipNet.IP.Equal(lAddr.IP) {
c.InterfaceMTU = e.MTU
c.TLSTPHandler.MaxPacketSize = uint64(c.InterfaceMTU - headerOverhead)
break findMTU
}
}
}
}
c.UseIPv6 = useIPv6
c.Host = udpAddr
return c, nil
}
func NewConnection(serverName string, version uint32, ALPN string, SCID []byte, DCID []byte, udpConn *net.UDPConn, resumptionTicket []byte) *Connection {
c := new(Connection)
c.ServerName = serverName
c.UdpConnection = udpConn
c.SourceCID = SCID
c.DestinationCID = DCID
c.OriginalDestinationCID = DCID
c.ResumptionTicket = resumptionTicket
c.IncomingPackets = NewBroadcaster(1000)
c.OutgoingPackets = NewBroadcaster(1000)
c.IncomingPayloads = NewBroadcaster(1000)
c.UnprocessedPayloads = NewBroadcaster(1000)
c.EncryptionLevels = NewBroadcaster(10)
c.FrameQueue = NewBroadcaster(1000)
c.TransportParameters = NewBroadcaster(10)
c.ConnectionClosed = make(chan bool, 1)
c.ConnectionRestart = make(chan bool, 1)
c.ConnectionRestarted = make(chan bool, 1)
c.PreparePacket = NewBroadcaster(1000)
c.SendPacket = NewBroadcaster(1000)
c.StreamInput = NewBroadcaster(1000)
c.PacketAcknowledged = NewBroadcaster(1000)
c.QLog.Version = "draft-01"
c.QLog.Description = "QUIC-Tracker"
if len(GitCommit()) > 0 {
c.QLog.Description += " commit " + GitCommit()
}
c.QLogTrace = &qlog.Trace{}
c.QLog.Traces = append(c.QLog.Traces, c.QLogTrace)
c.QLogTrace.VantagePoint.Name = "QUIC-Tracker"
c.QLogTrace.VantagePoint.Type = "client"
c.QLogTrace.Description = fmt.Sprintf("Connection to %s (%s), using version %08x and alpn %s", serverName, udpConn.RemoteAddr().String(), version, ALPN)
c.QLogTrace.ReferenceTime = time.Now()
c.QLogTrace.Configuration.TimeUnits = qlog.TimeUnitsString
c.QLogTrace.CommonFields = make(map[string]interface{})
c.QLogTrace.CommonFields["ODCID"] = hex.EncodeToString(c.OriginalDestinationCID)
c.QLogTrace.CommonFields["group_id"] = c.QLogTrace.CommonFields["ODCID"]
c.QLogTrace.CommonFields["reference_time"] = c.QLogTrace.ReferenceTime.UnixNano() / int64(qlog.TimeUnits)
c.QLogTrace.EventFields = qlog.DefaultEventFields()
c.QLogEvents = make(chan *qlog.Event, 1000)
go func() {
for e := range c.QLogEvents {
c.QLogTrace.Add(e)
}
}()
c.Logger = log.New(os.Stderr, fmt.Sprintf("[CID %s] ", hex.EncodeToString(c.OriginalDestinationCID)), log.Lshortfile)
c.TransitionTo(version, ALPN)
return c
}