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conn.go
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conn.go
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package dtls
import (
"crypto/rand"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"math"
"net"
"sync"
"sync/atomic"
"time"
"github.com/pion/logging"
)
const (
initialTickerInterval = time.Second
cookieLength = 20
defaultNamedCurve = namedCurveX25519
inboundBufferSize = 8192
)
var invalidKeyingLabels = map[string]bool{
"client finished": true,
"server finished": true,
"master secret": true,
"key expansion": true,
}
type handshakeMessageHandler func(*Conn) (*alert, error)
type flightHandler func(*Conn) (bool, *alert, error)
// Conn represents a DTLS connection
type Conn struct {
lock sync.RWMutex // Internal lock (must not be public)
nextConn net.Conn // Embedded Conn, typically a udpconn we read/write from
fragmentBuffer *fragmentBuffer // out-of-order and missing fragment handling
handshakeCache *handshakeCache // caching of handshake messages for verifyData generation
decrypted chan []byte // Decrypted Application Data, pull by calling `Read`
workerTicker *time.Ticker
state State // Internal state
connectTimeout time.Duration
maximumTransmissionUnit int
remoteRequestedCertificate bool // Did we get a CertificateRequest
localSRTPProtectionProfiles []SRTPProtectionProfile // Available SRTPProtectionProfiles, if empty no SRTP support
localCipherSuites []cipherSuite // Available CipherSuites, if empty use default list
clientAuth ClientAuthType // If we are a client should we request a client certificate
extendedMasterSecret ExtendedMasterSecretType // Policy for the Extended Master Support extension
currFlight *flight
namedCurve namedCurve
localCertificates []tls.Certificate
localKeypair *namedCurveKeypair
cookie []byte
localPSKCallback PSKCallback
localPSKIdentityHint []byte
localCertificatesVerify []byte // cache CertificateVerify
localVerifyData []byte // cached VerifyData
localKeySignature []byte // cached keySignature
remoteCertificateVerified bool
insecureSkipVerify bool
verifyPeerCertificate func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error
rootCAs *x509.CertPool
clientCAs *x509.CertPool
serverName string
handshakeMessageSequence int
handshakeMessageHandler handshakeMessageHandler
flightHandler flightHandler
handshakeDoneSignal *Closer
handshakeCompletedSuccessfully atomic.Value
bufferedPackets []*packet
connectionClosed *Closer // Closed on connection close and unblock read
handshakeErr *atomicError // Error if one occurred during handshake
readErr *atomicError // Error if one occurred in inboundLoop
log logging.LeveledLogger
}
func createConn(nextConn net.Conn, flightHandler flightHandler, handshakeMessageHandler handshakeMessageHandler, config *Config, isClient bool) (*Conn, error) {
err := validateConfig(config)
if err != nil {
return nil, err
}
if nextConn == nil {
return nil, errNilNextConn
}
cipherSuites, err := parseCipherSuites(config.CipherSuites, config.PSK == nil, config.PSK != nil)
if err != nil {
return nil, err
}
workerInterval := initialTickerInterval
if config.FlightInterval != 0 {
workerInterval = config.FlightInterval
}
loggerFactory := config.LoggerFactory
if loggerFactory == nil {
loggerFactory = logging.NewDefaultLoggerFactory()
}
logger := loggerFactory.NewLogger("dtls")
connectTimeout := defaultConnectTimeout
if config.ConnectTimeout != nil {
connectTimeout = *config.ConnectTimeout
}
if connectTimeout <= 0 {
connectTimeout = math.MaxInt64 * time.Nanosecond
}
mtu := config.MTU
if mtu <= 0 {
mtu = defaultMTU
}
handshakeDoneSignal := NewCloser()
connectionClosed := NewCloser()
c := &Conn{
nextConn: nextConn,
currFlight: newFlight(isClient, logger),
fragmentBuffer: newFragmentBuffer(),
handshakeCache: newHandshakeCache(),
handshakeMessageHandler: handshakeMessageHandler,
flightHandler: flightHandler,
connectTimeout: connectTimeout,
maximumTransmissionUnit: mtu,
localCertificates: config.Certificates,
clientAuth: config.ClientAuth,
extendedMasterSecret: config.ExtendedMasterSecret,
insecureSkipVerify: config.InsecureSkipVerify,
verifyPeerCertificate: config.VerifyPeerCertificate,
rootCAs: config.RootCAs,
clientCAs: config.ClientCAs,
serverName: config.ServerName,
localSRTPProtectionProfiles: config.SRTPProtectionProfiles,
localCipherSuites: cipherSuites,
namedCurve: defaultNamedCurve,
localPSKCallback: config.PSK,
localPSKIdentityHint: config.PSKIdentityHint,
decrypted: make(chan []byte),
workerTicker: time.NewTicker(workerInterval),
handshakeDoneSignal: handshakeDoneSignal,
connectionClosed: connectionClosed,
log: logger,
handshakeErr: &atomicError{},
readErr: &atomicError{},
}
// Use host from conn address when serverName is not provided
if isClient && c.serverName == "" && nextConn.RemoteAddr() != nil {
remoteAddr := nextConn.RemoteAddr().String()
var host string
host, _, err = net.SplitHostPort(remoteAddr)
if err != nil {
c.serverName = remoteAddr
}
c.serverName = host
}
var zeroEpoch uint16
c.state.localEpoch.Store(zeroEpoch)
c.state.remoteEpoch.Store(zeroEpoch)
c.state.isClient = isClient
if err = c.state.localRandom.populate(); err != nil {
return nil, err
}
if !isClient {
c.cookie = make([]byte, cookieLength)
if _, err = rand.Read(c.cookie); err != nil {
return nil, err
}
}
// Trigger outbound
c.startHandshakeOutbound()
// Handle inbound
go c.inboundLoop()
select {
case <-c.handshakeDoneSignal.Done():
err = c.handshakeErr.load()
case <-time.After(c.connectTimeout):
err = errConnectTimeout
c.handshakeErr.store(err)
c.handshakeDoneSignal.Close()
}
if err != nil {
c.close() //nolint
} else {
c.setHandshakeCompletedSuccessfully()
}
c.log.Trace(fmt.Sprintf("Handshake Completed (Error: %v)", err))
return c, err
}
// Dial connects to the given network address and establishes a DTLS connection on top
func Dial(network string, raddr *net.UDPAddr, config *Config) (*Conn, error) {
pConn, err := net.DialUDP(network, nil, raddr)
if err != nil {
return nil, err
}
return Client(pConn, config)
}
// Client establishes a DTLS connection over an existing conn
func Client(conn net.Conn, config *Config) (*Conn, error) {
switch {
case config == nil:
return nil, errNoConfigProvided
case config.PSK != nil && config.PSKIdentityHint == nil:
return nil, errPSKAndIdentityMustBeSetForClient
}
return createConn(conn, clientFlightHandler, clientHandshakeHandler, config, true)
}
// Server listens for incoming DTLS connections
func Server(conn net.Conn, config *Config) (*Conn, error) {
switch {
case config == nil:
return nil, errNoConfigProvided
case config.PSK == nil && len(config.Certificates) == 0:
return nil, errServerMustHaveCertificate
}
return createConn(conn, serverFlightHandler, serverHandshakeHandler, config, false)
}
// Read reads data from the connection.
func (c *Conn) Read(p []byte) (n int, err error) {
checkConnStatus := func() error {
if err := c.handshakeErr.load(); err != nil {
return err
}
if c.connectionClosed.ctx.Err() != nil {
return io.EOF
}
if err := c.readErr.load(); err != nil {
return err
}
return nil
}
if err := checkConnStatus(); err != nil {
return 0, err
}
out, ok := <-c.decrypted
if err := checkConnStatus(); err != nil {
return 0, err
}
// inboundLoop has closed but error has not been set yet
if !ok {
return 0, io.EOF
}
if len(p) < len(out) {
return 0, errBufferTooSmall
}
copy(p, out)
return len(out), nil
}
// Write writes len(p) bytes from p to the DTLS connection
func (c *Conn) Write(p []byte) (int, error) {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.handshakeErr.load(); err != nil {
return 0, err
}
if c.connectionClosed.ctx.Err() != nil {
return 0, ErrConnClosed
}
if !c.isHandshakeCompletedSuccessfully() {
return 0, errHandshakeInProgress
}
if err := c.bufferPacket(&packet{
record: &recordLayer{
recordLayerHeader: recordLayerHeader{
epoch: c.getLocalEpoch(),
protocolVersion: protocolVersion1_2,
},
content: &applicationData{
data: p,
},
},
shouldEncrypt: true,
}); err != nil {
return 0, err
}
return len(p), c.flushPacketBuffer()
}
// Close closes the connection.
func (c *Conn) Close() error {
return c.close()
}
// RemoteCertificate exposes the remote certificate
func (c *Conn) RemoteCertificate() [][]byte {
c.lock.RLock()
defer c.lock.RUnlock()
return c.state.remoteCertificate
}
// SelectedSRTPProtectionProfile returns the selected SRTPProtectionProfile
func (c *Conn) SelectedSRTPProtectionProfile() (SRTPProtectionProfile, bool) {
c.lock.RLock()
defer c.lock.RUnlock()
if c.state.srtpProtectionProfile == 0 {
return 0, false
}
return c.state.srtpProtectionProfile, true
}
// ExportKeyingMaterial from https://tools.ietf.org/html/rfc5705
// This allows protocols to use DTLS for key establishment, but
// then use some of the keying material for their own purposes
func (c *Conn) ExportKeyingMaterial(label string, context []byte, length int) ([]byte, error) {
c.lock.Lock()
defer c.lock.Unlock()
if c.getLocalEpoch() == 0 {
return nil, errHandshakeInProgress
} else if len(context) != 0 {
return nil, errContextUnsupported
} else if _, ok := invalidKeyingLabels[label]; ok {
return nil, errReservedExportKeyingMaterial
}
localRandom, err := c.state.localRandom.Marshal()
if err != nil {
return nil, err
}
remoteRandom, err := c.state.remoteRandom.Marshal()
if err != nil {
return nil, err
}
seed := []byte(label)
if c.state.isClient {
seed = append(append(seed, localRandom...), remoteRandom...)
} else {
seed = append(append(seed, remoteRandom...), localRandom...)
}
return prfPHash(c.state.masterSecret, seed, length, c.state.cipherSuite.hashFunc())
}
func (c *Conn) bufferPacket(p *packet) error {
if h, ok := p.record.content.(*handshake); ok {
handshakeRaw, err := p.record.Marshal()
if err != nil {
return err
}
c.log.Tracef("[handshake] -> %s", h.handshakeHeader.handshakeType.String())
c.handshakeCache.push(handshakeRaw[recordLayerHeaderSize:], h.handshakeHeader.messageSequence, h.handshakeHeader.handshakeType, c.state.isClient)
}
c.bufferedPackets = append(c.bufferedPackets, p)
return nil
}
func (c *Conn) flushPacketBuffer() error {
var rawPackets [][]byte
for _, p := range c.bufferedPackets {
if p.resetLocalSequenceNumber {
atomic.StoreUint64(&c.state.localSequenceNumber, 0)
}
if h, ok := p.record.content.(*handshake); ok {
rawHandshakePackets, err := c.processHandshakePacket(p, h)
if err != nil {
return err
}
rawPackets = append(rawPackets, rawHandshakePackets...)
} else {
rawPacket, err := c.processPacket(p)
if err != nil {
return err
}
rawPackets = [][]byte{rawPacket}
}
}
c.bufferedPackets = []*packet{}
compactedRawPackets := c.compactRawPackets(rawPackets)
for _, compactedRawPackets := range compactedRawPackets {
if _, err := c.nextConn.Write(compactedRawPackets); err != nil {
return err
}
}
return nil
}
func (c *Conn) compactRawPackets(rawPackets [][]byte) [][]byte {
combinedRawPackets := make([][]byte, 0)
currentCombinedRawPacket := make([]byte, 0)
for _, rawPacket := range rawPackets {
if len(currentCombinedRawPacket) > 0 && len(currentCombinedRawPacket)+len(rawPacket) >= c.maximumTransmissionUnit {
combinedRawPackets = append(combinedRawPackets, currentCombinedRawPacket)
currentCombinedRawPacket = []byte{}
}
currentCombinedRawPacket = append(currentCombinedRawPacket, rawPacket...)
}
combinedRawPackets = append(combinedRawPackets, currentCombinedRawPacket)
return combinedRawPackets
}
func (c *Conn) processPacket(p *packet) ([]byte, error) {
p.record.recordLayerHeader.sequenceNumber = atomic.LoadUint64(&c.state.localSequenceNumber)
atomic.AddUint64(&c.state.localSequenceNumber, 1)
rawPacket, err := p.record.Marshal()
if err != nil {
return nil, err
}
if p.shouldEncrypt {
var err error
rawPacket, err = c.state.cipherSuite.encrypt(p.record, rawPacket)
if err != nil {
return nil, err
}
}
return rawPacket, nil
}
func (c *Conn) processHandshakePacket(p *packet, h *handshake) ([][]byte, error) {
rawPackets := make([][]byte, 0)
handshakeFragments, err := c.fragmentHandshake(h)
if err != nil {
return nil, err
}
for _, handshakeFragment := range handshakeFragments {
recordLayerHeader := &recordLayerHeader{
contentType: p.record.recordLayerHeader.contentType,
contentLen: uint16(len(handshakeFragment)),
protocolVersion: p.record.recordLayerHeader.protocolVersion,
epoch: p.record.recordLayerHeader.epoch,
sequenceNumber: atomic.LoadUint64(&c.state.localSequenceNumber),
}
atomic.AddUint64(&c.state.localSequenceNumber, 1)
recordLayerHeaderBytes, err := recordLayerHeader.Marshal()
if err != nil {
return nil, err
}
rawPacket := append(recordLayerHeaderBytes, handshakeFragment...)
if p.shouldEncrypt {
var err error
rawPacket, err = c.state.cipherSuite.encrypt(p.record, rawPacket)
if err != nil {
return nil, err
}
}
rawPackets = append(rawPackets, rawPacket)
}
return rawPackets, nil
}
func (c *Conn) fragmentHandshake(h *handshake) ([][]byte, error) {
content, err := h.handshakeMessage.Marshal()
if err != nil {
return nil, err
}
fragmentedHandshakes := make([][]byte, 0)
contentFragments := splitBytes(content, c.maximumTransmissionUnit)
if len(contentFragments) == 0 {
contentFragments = [][]byte{
{},
}
}
offset := 0
for _, contentFragment := range contentFragments {
contentFragmentLen := len(contentFragment)
handshakeHeaderFragment := &handshakeHeader{
handshakeType: h.handshakeHeader.handshakeType,
length: h.handshakeHeader.length,
messageSequence: h.handshakeHeader.messageSequence,
fragmentOffset: uint32(offset),
fragmentLength: uint32(contentFragmentLen),
}
offset += contentFragmentLen
handshakeHeaderFragmentRaw, err := handshakeHeaderFragment.Marshal()
if err != nil {
return nil, err
}
fragmentedHandshake := append(handshakeHeaderFragmentRaw, contentFragment...)
fragmentedHandshakes = append(fragmentedHandshakes, fragmentedHandshake)
}
return fragmentedHandshakes, nil
}
func (c *Conn) inboundLoop() {
defer func() {
close(c.decrypted)
}()
b := make([]byte, inboundBufferSize)
for {
i, err := c.nextConn.Read(b)
if err != nil {
c.readErr.store(err)
return
}
pkts, err := unpackDatagram(b[:i])
if err != nil {
c.readErr.store(err)
return
}
for _, p := range pkts {
alert, err := c.handleIncomingPacket(p)
if alert != nil {
if alertErr := c.notify(alert.alertLevel, alert.alertDescription); alertErr != nil {
err = fmt.Errorf("%v %v", err, alertErr)
}
}
if err != nil {
c.readErr.store(err)
return
}
}
}
}
func (c *Conn) handleIncomingPacket(buf []byte) (*alert, error) {
// TODO: avoid separate unmarshal
h := &recordLayerHeader{}
if err := h.Unmarshal(buf); err != nil {
return &alert{alertLevelFatal, alertDecodeError}, err
}
if h.epoch < c.getRemoteEpoch() {
if _, alertPtr, err := c.flightHandler(c); err != nil {
return alertPtr, err
}
}
if h.epoch != 0 {
if c.state.cipherSuite == nil || !c.state.cipherSuite.isInitialized() {
c.log.Debug("handleIncoming: Handshake not finished, dropping packet")
return nil, nil
}
var err error
buf, err = c.state.cipherSuite.decrypt(buf)
if err != nil {
c.log.Debugf("decrypt failed: %s", err)
return nil, nil
}
}
isHandshake, err := c.fragmentBuffer.push(append([]byte{}, buf...))
if err != nil {
return &alert{alertLevelFatal, alertDecodeError}, err
} else if isHandshake {
newHandshakeMessage := false
for out := c.fragmentBuffer.pop(); out != nil; out = c.fragmentBuffer.pop() {
rawHandshake := &handshake{}
if err := rawHandshake.Unmarshal(out); err != nil {
return &alert{alertLevelFatal, alertDecodeError}, err
}
if c.handshakeCache.push(out, rawHandshake.handshakeHeader.messageSequence, rawHandshake.handshakeHeader.handshakeType, !c.state.isClient) {
newHandshakeMessage = true
}
}
if !newHandshakeMessage {
return nil, nil
}
c.lock.Lock()
defer c.lock.Unlock()
return c.handshakeMessageHandler(c)
}
r := &recordLayer{}
if err := r.Unmarshal(buf); err != nil {
return &alert{alertLevelFatal, alertDecodeError}, err
}
switch content := r.content.(type) {
case *alert:
c.log.Tracef("<- %s", content.String())
if content.alertDescription == alertCloseNotify {
return nil, c.Close()
}
return nil, fmt.Errorf("alert: %v", content)
case *changeCipherSpec:
c.log.Trace("<- ChangeCipherSpec")
newRemoteEpoch := h.epoch + 1
if c.getRemoteEpoch() < newRemoteEpoch {
c.setRemoteEpoch(newRemoteEpoch)
}
case *applicationData:
if h.epoch == 0 {
return &alert{alertLevelFatal, alertUnexpectedMessage}, fmt.Errorf("ApplicationData with epoch of 0")
}
select {
case c.decrypted <- content.data:
case <-c.connectionClosed.Done():
}
default:
return &alert{alertLevelFatal, alertUnexpectedMessage}, fmt.Errorf("unhandled contentType %d", content.contentType())
}
return nil, nil
}
func (c *Conn) notify(level alertLevel, desc alertDescription) error {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.bufferPacket(&packet{
record: &recordLayer{
recordLayerHeader: recordLayerHeader{
epoch: c.getLocalEpoch(),
protocolVersion: protocolVersion1_2,
},
content: &alert{
alertLevel: level,
alertDescription: desc,
},
},
shouldEncrypt: c.isHandshakeCompletedSuccessfully(),
}); err != nil {
return err
}
return c.flushPacketBuffer()
}
func (c *Conn) setHandshakeCompletedSuccessfully() {
c.handshakeCompletedSuccessfully.Store(struct{ bool }{true})
}
func (c *Conn) isHandshakeCompletedSuccessfully() bool {
boolean, _ := c.handshakeCompletedSuccessfully.Load().(struct{ bool })
return boolean.bool
}
func (c *Conn) startHandshakeOutbound() {
go func() {
defer func() {
if c.handshakeErr.load() != nil {
if err := c.close(); err != nil {
c.log.Errorf(fmt.Sprintf("Failed to close (%v)", err))
}
}
}()
for {
var (
isFinished bool
alertPtr *alert
err error
)
select {
case <-c.handshakeDoneSignal.Done():
return
case <-c.workerTicker.C:
isFinished, alertPtr, err = c.flightHandler(c)
case <-c.currFlight.workerTrigger:
isFinished, alertPtr, err = c.flightHandler(c)
}
if alertPtr != nil {
if alertErr := c.notify(alertPtr.alertLevel, alertPtr.alertDescription); alertErr != nil {
err = fmt.Errorf("%v %v", err, alertErr)
}
}
switch {
case err != nil:
c.handshakeErr.store(err)
return
case c.readErr.load() != nil:
c.handshakeErr.store(c.readErr.load()) // Promote readErr to handshakeErr during handshake
return
case isFinished:
return // Handshake is complete
}
}
}()
c.currFlight.workerTrigger <- struct{}{}
}
func (c *Conn) close() error {
if c.connectionClosed.ctx.Err() == nil && c.handshakeErr.load() == nil {
c.notify(alertLevelFatal, alertCloseNotify) //nolint
}
c.workerTicker.Stop()
c.handshakeDoneSignal.Close()
c.connectionClosed.Close()
return c.nextConn.Close()
}
func (c *Conn) setLocalEpoch(epoch uint16) {
c.state.localEpoch.Store(epoch)
}
func (c *Conn) getLocalEpoch() uint16 {
return c.state.localEpoch.Load().(uint16)
}
func (c *Conn) setRemoteEpoch(epoch uint16) {
c.state.remoteEpoch.Store(epoch)
}
func (c *Conn) getRemoteEpoch() uint16 {
return c.state.remoteEpoch.Load().(uint16)
}
// LocalAddr is a stub
func (c *Conn) LocalAddr() net.Addr {
return c.nextConn.LocalAddr()
}
// RemoteAddr is a stub
func (c *Conn) RemoteAddr() net.Addr {
return c.nextConn.RemoteAddr()
}
// SetDeadline is a stub
func (c *Conn) SetDeadline(t time.Time) error {
return c.nextConn.SetDeadline(t)
}
// SetReadDeadline is a stub
func (c *Conn) SetReadDeadline(t time.Time) error {
return c.nextConn.SetReadDeadline(t)
}
// SetWriteDeadline is a stub
func (c *Conn) SetWriteDeadline(t time.Time) error {
return c.nextConn.SetWriteDeadline(t)
}