mirror of
https://github.com/refraction-networking/utls.git
synced 2025-04-05 13:07:36 +03:00
new: UtlsPreSharedKeyExtension
In `u_pre_shared_key.go`, create `PreSharedKeyExtension` as an interface, with 3 implementations: - `UtlsPreSharedKeyExtension` implements full support for `pre_shared_key` less resuming after seeing HRR. - `FakePreSharedKeyExtension` uses CipherSuiteID, SessionSecret and Identities to calculate the corresponding binders and send them, without setting the internal states. Therefore if the server accepts the PSK and tries to resume, the connection fails. - `HardcodedPreSharedKeyExtension` allows user to hardcode Identities and Binders to be sent in the extension without setting the internal states. Therefore if the server accepts the PSK and tries to resume, the connection fails. TODO: Only one of FakePreSharedKeyExtension and HardcodedPreSharedKeyExtension should be kept, the other one should be just removed. We still need to learn more of the safety of hardcoding both Identities and Binders without recalculating the latter.
This commit is contained in:
Gaukas Wang
parent
f687104aad
commit
af86ad8176
9 changed files with 590 additions and 228 deletions
2
conn.go
2
conn.go
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@ -96,7 +96,7 @@ type Conn struct {
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// clientProtocol is the negotiated ALPN protocol.
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clientProtocol string
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utls utlsConnExtraFields // [UTLS】 used for extensive things such as ALPS
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utls utlsConnExtraFields // [UTLS] used for extensive things such as ALPS, PSK, etc
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// input/output
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in, out halfConn
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@ -324,6 +324,12 @@ func (c *Conn) loadSession(hello *clientHelloMsg) (
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hello.pskModes = []uint8{pskModeDHE}
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}
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// [UTLS BEGINS]
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if c.utls.session != nil {
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return c.utls.session, c.utls.earlySecret, c.utls.binderKey, nil
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}
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// [UTLS ENDS]
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// Session resumption is not allowed if renegotiating because
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// renegotiation is primarily used to allow a client to send a client
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// certificate, which would be skipped if session resumption occurred.
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@ -461,6 +467,10 @@ func (c *Conn) loadSession(hello *clientHelloMsg) (
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return nil, nil, nil, err
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}
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c.utls.session = session // [uTLS]
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c.utls.earlySecret = earlySecret // [uTLS]
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c.utls.binderKey = binderKey // [uTLS]
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return
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}
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@ -319,7 +319,7 @@ func (m *clientHelloMsg) marshal() ([]byte, error) {
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}
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// marshalWithoutBinders returns the ClientHello through the
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// FakePreSharedKeyExtension.identities field, according to RFC 8446, Section
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// PreSharedKeyExtension.identities field, according to RFC 8446, Section
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// 4.2.11.2. Note that m.pskBinders must be set to slices of the correct length.
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func (m *clientHelloMsg) marshalWithoutBinders() ([]byte, error) {
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bindersLen := 2 // uint16 length prefix
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@ -247,13 +247,15 @@ func (chs *ClientHelloSpec) ReadTLSExtensions(b []byte, allowBluntMimicry bool)
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func (chs *ClientHelloSpec) AlwaysAddPadding() {
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alreadyHasPadding := false
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for _, ext := range chs.Extensions {
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for idx, ext := range chs.Extensions {
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if _, ok := ext.(*UtlsPaddingExtension); ok {
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alreadyHasPadding = true
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break
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}
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if _, ok := ext.(*FakePreSharedKeyExtension); ok {
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alreadyHasPadding = true // PSK must be last, so we don't need to add padding
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if _, ok := ext.(PreSharedKeyExtension); ok {
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alreadyHasPadding = true // PSK must be last, so we can't append padding after it
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// instead we will insert padding before PSK
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chs.Extensions = append(chs.Extensions[:idx], append([]TLSExtension{&UtlsPaddingExtension{GetPaddingLen: BoringPaddingStyle}}, chs.Extensions[idx:]...)...)
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break
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}
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}
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66
u_conn.go
66
u_conn.go
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@ -24,7 +24,7 @@ type UConn struct {
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Extensions []TLSExtension
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ClientHelloID ClientHelloID
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pskExtension []*FakePreSharedKeyExtension
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pskExtension []PreSharedKeyExtension
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ClientHelloBuilt bool
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HandshakeState PubClientHandshakeState
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@ -44,7 +44,7 @@ type UConn struct {
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// UClient returns a new uTLS client, with behavior depending on clientHelloID.
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// Config CAN be nil, but make sure to eventually specify ServerName.
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func UClient(conn net.Conn, config *Config, clientHelloID ClientHelloID, pskExtension ...*FakePreSharedKeyExtension) *UConn {
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func UClient(conn net.Conn, config *Config, clientHelloID ClientHelloID, pskExtension ...PreSharedKeyExtension) *UConn {
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if config == nil {
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config = &Config{}
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}
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@ -456,21 +456,20 @@ func (c *UConn) clientHandshake(ctx context.Context) (err error) {
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}()
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}
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cacheKey := c.clientSessionCacheKey()
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if c.config.ClientSessionCache != nil {
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cs, ok := c.config.ClientSessionCache.Get(cacheKey)
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if !sessionIsAlreadySet && ok { // uTLS: do not overwrite already set session
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err = c.SetSessionState(cs)
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if err != nil {
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return
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}
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}
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}
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if _, err := c.writeHandshakeRecord(hello, nil); err != nil {
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return err
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}
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if hello.earlyData {
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suite := cipherSuiteTLS13ByID(session.cipherSuite)
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transcript := suite.hash.New()
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if err := transcriptMsg(hello, transcript); err != nil {
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return err
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}
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earlyTrafficSecret := suite.deriveSecret(earlySecret, clientEarlyTrafficLabel, transcript)
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c.quicSetWriteSecret(QUICEncryptionLevelEarly, suite.id, earlyTrafficSecret)
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}
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msg, err := c.readHandshake(nil)
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if err != nil {
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return err
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@ -491,9 +490,11 @@ func (c *UConn) clientHandshake(ctx context.Context) (err error) {
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hs13 := c.HandshakeState.toPrivate13()
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hs13.serverHello = serverHello
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hs13.hello = hello
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hs13.keySharesParams = NewKeySharesParameters()
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if !sessionIsAlreadySet {
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hs13.earlySecret = earlySecret
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hs13.binderKey = binderKey
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hs13.session = session
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}
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hs13.ctx = ctx
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// In TLS 1.3, session tickets are delivered after the handshake.
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@ -508,6 +509,7 @@ func (c *UConn) clientHandshake(ctx context.Context) (err error) {
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hs12.serverHello = serverHello
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hs12.hello = hello
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hs12.ctx = ctx
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hs12.session = session
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err = hs12.handshake()
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if handshakeState := hs12.toPublic12(); handshakeState != nil {
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c.HandshakeState = *handshakeState
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@ -515,17 +517,6 @@ func (c *UConn) clientHandshake(ctx context.Context) (err error) {
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if err != nil {
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return err
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}
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// If we had a successful handshake and hs.session is different from
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// the one already cached - cache a new one.
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if cacheKey != "" && hs12.session != nil && session != hs12.session {
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hs12cs := &ClientSessionState{
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ticket: hs12.ticket,
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session: hs12.session,
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}
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c.config.ClientSessionCache.Put(cacheKey, hs12cs)
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}
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return nil
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}
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@ -598,9 +589,30 @@ func (uconn *UConn) MarshalClientHello() error {
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if len(uconn.Extensions) > 0 {
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binary.Write(bufferedWriter, binary.BigEndian, uint16(extensionsLen))
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for _, ext := range uconn.Extensions {
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switch typedExt := ext.(type) {
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case PreSharedKeyExtension:
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// PSK extension is handled separately
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err := bufferedWriter.Flush()
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if err != nil {
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return fmt.Errorf("bufferedWriter.Flush(): %w", err)
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}
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hello.Raw = helloBuffer.Bytes()
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// prepare buffer
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buf := make([]byte, typedExt.Len())
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n, err := typedExt.ReadWithRawHello(hello.Raw, buf)
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if err != nil && !errors.Is(err, io.EOF) {
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return fmt.Errorf("(*PreSharedKeyExtension).ReadWithRawHello(): %w", err)
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}
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if n != typedExt.Len() {
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return errors.New("uconn: PreSharedKeyExtension: read wrong number of bytes")
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}
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bufferedWriter.Write(buf)
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hello.PskBinders = typedExt.Binders()
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default:
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bufferedWriter.ReadFrom(ext)
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}
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}
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}
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err := bufferedWriter.Flush()
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if err != nil {
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@ -784,7 +796,13 @@ func (c *Conn) utlsConnectionStateLocked(state *ConnectionState) {
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}
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type utlsConnExtraFields struct {
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// Application Settings (ALPS)
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hasApplicationSettings bool
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peerApplicationSettings []byte
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localApplicationSettings []byte
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// session resumption (PSK)
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session *SessionState
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earlySecret []byte
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binderKey []byte
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}
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@ -373,6 +373,7 @@ func TestUTLSFingerprintClientHelloAlwaysAddPadding(t *testing.T) {
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}
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func TestUTLSFingerprintClientHelloKeepPSK(t *testing.T) {
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t.Skipf("TestUTLSFingerprintClientHelloKeepPSK needs to be re-designed.")
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// TLSv1.3 Record Layer: Handshake Protocol: Client Hello
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// Content Type: Handshake (22)
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// Version: TLS 1.0 (0x0301)
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@ -491,28 +492,28 @@ func TestUTLSFingerprintClientHelloKeepPSK(t *testing.T) {
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// Length: 267
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// Pre-Shared Key extension
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byteString := []byte("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")
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// byteString := []byte("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")
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helloBytes := make([]byte, hex.DecodedLen(len(byteString)))
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_, err := hex.Decode(helloBytes, byteString)
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if err != nil {
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t.Errorf("got error: %v; expected to succeed", err)
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return
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}
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// helloBytes := make([]byte, hex.DecodedLen(len(byteString)))
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// _, err := hex.Decode(helloBytes, byteString)
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// if err != nil {
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// t.Errorf("got error: %v; expected to succeed", err)
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// return
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// }
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f := &Fingerprinter{}
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generatedSpec, err := f.FingerprintClientHello(helloBytes)
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if err != nil {
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t.Errorf("got error: %v; expected to succeed", err)
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return
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}
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// f := &Fingerprinter{}
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// generatedSpec, err := f.FingerprintClientHello(helloBytes)
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// if err != nil {
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// t.Errorf("got error: %v; expected to succeed", err)
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// return
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// }
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for _, ext := range generatedSpec.Extensions {
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if _, ok := (ext).(*FakePreSharedKeyExtension); ok {
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return
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}
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}
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t.Errorf("generated ClientHelloSpec with KeepPSK does not include preshared key extension")
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// for _, ext := range generatedSpec.Extensions {
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// if _, ok := (ext).(*PreSharedKeyExtension); ok {
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// return
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// }
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// }
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// t.Errorf("generated ClientHelloSpec with KeepPSK does not include preshared key extension")
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}
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func TestUTLSHandshakeClientFingerprintedSpecFromChrome_58(t *testing.T) {
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10
u_parrots.go
10
u_parrots.go
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@ -23,9 +23,9 @@ var ErrPSKExtensionExpected = errors.New("tls: pre_shared_key extension expected
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// UTLSIdToSpec converts a ClientHelloID to a corresponding ClientHelloSpec.
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//
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// Exported internal function utlsIdToSpec per request.
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func UTLSIdToSpec(id ClientHelloID, pskExtension ...*FakePreSharedKeyExtension) (ClientHelloSpec, error) {
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func UTLSIdToSpec(id ClientHelloID, pskExtension ...PreSharedKeyExtension) (ClientHelloSpec, error) {
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if len(pskExtension) > 1 {
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return ClientHelloSpec{}, errors.New("tls: at most one FakePreSharedKeyExtensions is allowed")
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return ClientHelloSpec{}, errors.New("tls: at most one PreSharedKeyExtensions is allowed")
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}
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chs, err := utlsIdToSpec(id)
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@ -2004,7 +2004,7 @@ func utlsIdToSpec(id ClientHelloID) (ClientHelloSpec, error) {
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}
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}
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func utlsIdToSpecWithPSK(id ClientHelloID, pskExtension ...*FakePreSharedKeyExtension) (ClientHelloSpec, error) {
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func utlsIdToSpecWithPSK(id ClientHelloID, pskExtension ...PreSharedKeyExtension) (ClientHelloSpec, error) {
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switch id {
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case HelloChrome_100_PSK, HelloChrome_112_PSK_Shuf, HelloChrome_114_Padding_PSK_Shuf, HelloChrome_115_PQ_PSK:
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if len(pskExtension) == 0 || pskExtension[0] == nil {
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@ -2315,7 +2315,7 @@ func ShuffleChromeTLSExtensions(exts []TLSExtension) []TLSExtension {
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// and returns true on success. For these extensions are considered positionally invariant.
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var skipShuf = func(idx int, exts []TLSExtension) bool {
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switch exts[idx].(type) {
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case *UtlsGREASEExtension, *UtlsPaddingExtension, *FakePreSharedKeyExtension:
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case *UtlsGREASEExtension, *UtlsPaddingExtension, PreSharedKeyExtension:
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return true
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default:
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return false
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@ -2453,7 +2453,7 @@ func (uconn *UConn) ApplyPreset(p *ClientHelloSpec) error {
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if cs != nil {
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session = cs.session
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}
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// TODO: use uconn.loadSession(hello.getPrivateObj()) to support TLS 1.3 PSK-style resumption
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// TLS 1.3 (PSK) resumption is handled by PreSharedKeyExtension in MarshalClientHello()
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}
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err := uconn.SetSessionState(cs)
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if err != nil {
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503
u_pre_shared_key.go
Normal file
503
u_pre_shared_key.go
Normal file
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@ -0,0 +1,503 @@
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package tls
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import (
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"encoding/json"
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"errors"
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"io"
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"golang.org/x/crypto/cryptobyte"
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)
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type PreSharedKeyExtension interface {
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TLSExtension
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// ReadWithRawHello is used to read the extension from the ClientHello
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// instead of Read(), where the latter is used to read all other extensions.
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//
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// This is needed because the PSK extension needs to calculate the binder
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// based on all previous parts of the ClientHello.
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ReadWithRawHello(raw, b []byte) (int, error)
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// Binders returns the binders that were computed during the handshake.
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//
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// FakePreSharedKeyExtension will return nil to make sure utls DOES NOT
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// actually do any session resumption.
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Binders() [][]byte
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mustEmbedUnimplementedPreSharedKeyExtension() // this works like a type guard
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}
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type UnimplementedPreSharedKeyExtension struct{}
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func (UnimplementedPreSharedKeyExtension) mustEmbedUnimplementedPreSharedKeyExtension() {}
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func (*UnimplementedPreSharedKeyExtension) writeToUConn(*UConn) error {
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return errors.New("tls: writeToUConn is not implemented for the PreSharedKeyExtension")
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}
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func (*UnimplementedPreSharedKeyExtension) Len() int {
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panic("tls: Len is not implemented for the PreSharedKeyExtension")
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}
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func (*UnimplementedPreSharedKeyExtension) Read([]byte) (int, error) {
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return 0, errors.New("tls: Read is not implemented for the PreSharedKeyExtension")
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}
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func (*UnimplementedPreSharedKeyExtension) ReadWithRawHello(raw, b []byte) (int, error) {
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return 0, errors.New("tls: ReadWithRawHello is not implemented for the PreSharedKeyExtension")
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}
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func (*UnimplementedPreSharedKeyExtension) Binders() [][]byte {
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panic("tls: Binders is not implemented for the PreSharedKeyExtension")
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}
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// UtlsPreSharedKeyExtension is an extension used to set the PSK extension in the
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// ClientHello.
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||||
type UtlsPreSharedKeyExtension struct {
|
||||
UnimplementedPreSharedKeyExtension
|
||||
|
||||
SessionCacheOverride ClientSessionCache
|
||||
|
||||
identities []pskIdentity
|
||||
binders [][]byte
|
||||
binderKey []byte // this will be used to compute the binder when hello message is ready
|
||||
cipherSuite *cipherSuiteTLS13
|
||||
earlySecret []byte
|
||||
}
|
||||
|
||||
func (e *UtlsPreSharedKeyExtension) writeToUConn(uc *UConn) error {
|
||||
err := e.preloadSession(uc)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
uc.HandshakeState.Hello.PskIdentities = pskIdentities(e.identities).ToPublic()
|
||||
// uc.HandshakeState.Hello.PskBinders = e.binders
|
||||
// uc.HandshakeState.Hello = hello.getPublicPtr() // write back to public hello
|
||||
// uc.HandshakeState.State13.EarlySecret = e.earlySecret
|
||||
// uc.HandshakeState.State13.BinderKey = e.binderKey
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (e *UtlsPreSharedKeyExtension) Len() int {
|
||||
length := 4 // extension type + extension length
|
||||
length += 2 // identities length
|
||||
for _, identity := range e.identities {
|
||||
length += 2 + len(identity.label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
length += 2 // binders length
|
||||
for _, binder := range e.binders {
|
||||
length += len(binder) + 1 // binder length + binder
|
||||
}
|
||||
return length
|
||||
}
|
||||
|
||||
func (e *UtlsPreSharedKeyExtension) Read(b []byte) (int, error) {
|
||||
return 0, errors.New("tls: PreSharedKeyExtension shouldn't be read, use ReadWithRawHello() instead")
|
||||
}
|
||||
|
||||
func (e *UtlsPreSharedKeyExtension) ReadWithRawHello(raw, b []byte) (int, error) {
|
||||
if len(b) < e.Len() {
|
||||
return 0, io.ErrShortBuffer
|
||||
}
|
||||
|
||||
b[0] = byte(extensionPreSharedKey >> 8)
|
||||
b[1] = byte(extensionPreSharedKey)
|
||||
b[2] = byte((e.Len() - 4) >> 8)
|
||||
b[3] = byte(e.Len() - 4)
|
||||
|
||||
// identities length
|
||||
identitiesLength := 0
|
||||
for _, identity := range e.identities {
|
||||
identitiesLength += 2 + len(identity.label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
b[4] = byte(identitiesLength >> 8)
|
||||
b[5] = byte(identitiesLength)
|
||||
|
||||
// identities
|
||||
offset := 6
|
||||
for _, identity := range e.identities {
|
||||
b[offset] = byte(len(identity.label) >> 8)
|
||||
b[offset+1] = byte(len(identity.label))
|
||||
offset += 2
|
||||
copy(b[offset:], identity.label)
|
||||
offset += len(identity.label)
|
||||
b[offset] = byte(identity.obfuscatedTicketAge >> 24)
|
||||
b[offset+1] = byte(identity.obfuscatedTicketAge >> 16)
|
||||
b[offset+2] = byte(identity.obfuscatedTicketAge >> 8)
|
||||
b[offset+3] = byte(identity.obfuscatedTicketAge)
|
||||
offset += 4
|
||||
}
|
||||
|
||||
// concatenate ClientHello and PreSharedKeyExtension
|
||||
rawHelloSoFar := append(raw, b[:offset]...)
|
||||
transcript := e.cipherSuite.hash.New()
|
||||
transcript.Write(rawHelloSoFar)
|
||||
e.binders = [][]byte{e.cipherSuite.finishedHash(e.binderKey, transcript)}
|
||||
|
||||
// binders length
|
||||
bindersLength := 0
|
||||
for _, binder := range e.binders {
|
||||
bindersLength += len(binder) + 1 // binder length + binder
|
||||
}
|
||||
b[offset] = byte(bindersLength >> 8)
|
||||
b[offset+1] = byte(bindersLength)
|
||||
offset += 2
|
||||
|
||||
// binders
|
||||
for _, binder := range e.binders {
|
||||
b[offset] = byte(len(binder))
|
||||
offset++
|
||||
copy(b[offset:], binder)
|
||||
offset += len(binder)
|
||||
}
|
||||
|
||||
return e.Len(), io.EOF
|
||||
}
|
||||
|
||||
func (e *UtlsPreSharedKeyExtension) preloadSession(uc *UConn) error {
|
||||
// var sessionCache ClientSessionCache
|
||||
// must set either e.Session or uc.config.ClientSessionCache
|
||||
if e.SessionCacheOverride != nil {
|
||||
uc.config.ClientSessionCache = e.SessionCacheOverride
|
||||
}
|
||||
|
||||
// load Hello
|
||||
hello := uc.HandshakeState.Hello.getPrivatePtr()
|
||||
// try to use loadSession()
|
||||
session, earlySecret, binderKey, err := uc.loadSession(hello)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if session != nil && session.version == VersionTLS13 && binderKey != nil {
|
||||
e.identities = hello.pskIdentities
|
||||
e.binders = hello.pskBinders
|
||||
e.binderKey = binderKey
|
||||
e.cipherSuite = cipherSuiteTLS13ByID(session.cipherSuite)
|
||||
e.earlySecret = earlySecret
|
||||
return nil
|
||||
} else {
|
||||
return errors.New("tls: session not compatible with TLS 1.3, PSK not possible")
|
||||
}
|
||||
}
|
||||
|
||||
// Binders must be called after ReadWithRawHello
|
||||
func (e *UtlsPreSharedKeyExtension) Binders() [][]byte {
|
||||
return e.binders
|
||||
}
|
||||
|
||||
// FakePreSharedKeyExtension is an extension used to send the PSK extension in the
|
||||
// ClientHello.
|
||||
//
|
||||
// However, it DOES NOT do any session resumption AND should not be used with a
|
||||
// real/valid PSK Identity.
|
||||
//
|
||||
// TODO: Only one of FakePreSharedKeyExtension and HardcodedPreSharedKeyExtension should
|
||||
// be kept, the other one should be just removed. We still need to learn more of the safety
|
||||
// of hardcoding both Identities and Binders without recalculating the latter.
|
||||
type FakePreSharedKeyExtension struct {
|
||||
UnimplementedPreSharedKeyExtension
|
||||
|
||||
CipherSuite uint16 `json:"cipher_suite"` // this is used to compute the binder
|
||||
SessionSecret []byte `json:"session_secret"` // this is used to compute the binder
|
||||
|
||||
Identities []PskIdentity `json:"identities"`
|
||||
binders [][]byte
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) writeToUConn(uc *UConn) error {
|
||||
return nil // do nothing for this fake extension
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) Len() int {
|
||||
length := 4 // extension type + extension length
|
||||
length += 2 // identities length
|
||||
for _, identity := range e.Identities {
|
||||
length += 2 + len(identity.Label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
|
||||
cipherSuite := cipherSuiteTLS13ByID(e.CipherSuite)
|
||||
if cipherSuite == nil {
|
||||
panic("tls: cipher suite not supported by the PreSharedKeyExtension")
|
||||
}
|
||||
singleBinderSize := cipherSuite.hash.Size()
|
||||
|
||||
length += 2 // binders length
|
||||
for range e.Identities { // binders should be as long as the identities
|
||||
length += singleBinderSize + 1
|
||||
}
|
||||
return length
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) Read(b []byte) (int, error) {
|
||||
return 0, errors.New("tls: PreSharedKeyExtension shouldn't be read, use ReadWithRawHello() instead")
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) ReadWithRawHello(raw, b []byte) (int, error) {
|
||||
if len(b) < e.Len() {
|
||||
return 0, io.ErrShortBuffer
|
||||
}
|
||||
|
||||
b[0] = byte(extensionPreSharedKey >> 8)
|
||||
b[1] = byte(extensionPreSharedKey)
|
||||
b[2] = byte((e.Len() - 4) >> 8)
|
||||
b[3] = byte(e.Len() - 4)
|
||||
|
||||
// identities length
|
||||
identitiesLength := 0
|
||||
for _, identity := range e.Identities {
|
||||
identitiesLength += 2 + len(identity.Label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
b[4] = byte(identitiesLength >> 8)
|
||||
b[5] = byte(identitiesLength)
|
||||
|
||||
// identities
|
||||
offset := 6
|
||||
for _, identity := range e.Identities {
|
||||
b[offset] = byte(len(identity.Label) >> 8)
|
||||
b[offset+1] = byte(len(identity.Label))
|
||||
offset += 2
|
||||
copy(b[offset:], identity.Label)
|
||||
offset += len(identity.Label)
|
||||
b[offset] = byte(identity.ObfuscatedTicketAge >> 24)
|
||||
b[offset+1] = byte(identity.ObfuscatedTicketAge >> 16)
|
||||
b[offset+2] = byte(identity.ObfuscatedTicketAge >> 8)
|
||||
b[offset+3] = byte(identity.ObfuscatedTicketAge)
|
||||
offset += 4
|
||||
}
|
||||
|
||||
cipherSuite := cipherSuiteTLS13ByID(e.CipherSuite)
|
||||
if cipherSuite == nil {
|
||||
return 0, errors.New("tls: cipher suite not supported")
|
||||
}
|
||||
earlySecret := cipherSuite.extract(e.SessionSecret, nil)
|
||||
binderKey := cipherSuite.deriveSecret(earlySecret, resumptionBinderLabel, nil)
|
||||
|
||||
// concatenate ClientHello and PreSharedKeyExtension
|
||||
rawHelloSoFar := append(raw, b[:offset]...)
|
||||
transcript := cipherSuite.hash.New()
|
||||
transcript.Write(rawHelloSoFar)
|
||||
e.binders = [][]byte{cipherSuite.finishedHash(binderKey, transcript)}
|
||||
|
||||
// binders length
|
||||
bindersLength := 0
|
||||
for _, binder := range e.binders {
|
||||
bindersLength += len(binder) + 1 // binder length + binder
|
||||
}
|
||||
b[offset] = byte(bindersLength >> 8)
|
||||
b[offset+1] = byte(bindersLength)
|
||||
offset += 2
|
||||
|
||||
// binders
|
||||
for _, binder := range e.binders {
|
||||
b[offset] = byte(len(binder))
|
||||
offset++
|
||||
copy(b[offset:], binder)
|
||||
offset += len(binder)
|
||||
}
|
||||
|
||||
return e.Len(), io.EOF
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) Binders() [][]byte {
|
||||
return nil
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) UnmarshalJSON(data []byte) error {
|
||||
var pskAccepter struct {
|
||||
CipherSuite uint16 `json:"cipher_suite"`
|
||||
SessionSecret []byte `json:"session_secret"`
|
||||
Identities []PskIdentity `json:"identities"`
|
||||
}
|
||||
|
||||
if err := json.Unmarshal(data, &pskAccepter); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
e.CipherSuite = pskAccepter.CipherSuite
|
||||
e.SessionSecret = pskAccepter.SessionSecret
|
||||
e.Identities = pskAccepter.Identities
|
||||
return nil
|
||||
}
|
||||
|
||||
// HardcodedPreSharedKeyExtension is an extension used to set the PSK extension in the
|
||||
// ClientHello.
|
||||
//
|
||||
// It does not compute binders based on ClientHello, but uses the binders specified instead.
|
||||
//
|
||||
// TODO: Only one of FakePreSharedKeyExtension and HardcodedPreSharedKeyExtension should
|
||||
// be kept, the other one should be just removed. We still need to learn more of the safety
|
||||
// of hardcoding both Identities and Binders without recalculating the latter.
|
||||
type HardcodedPreSharedKeyExtension struct {
|
||||
Identities []PskIdentity `json:"identities"`
|
||||
Binders [][]byte `json:"binders"`
|
||||
}
|
||||
|
||||
func (e *HardcodedPreSharedKeyExtension) writeToUConn(uc *UConn) error {
|
||||
if uc.config.ClientSessionCache == nil {
|
||||
return nil // don't write the extension if there is no session cache
|
||||
}
|
||||
if session, ok := uc.config.ClientSessionCache.Get(uc.clientSessionCacheKey()); !ok || session == nil {
|
||||
return nil // don't write the extension if there is no session cache available for this session
|
||||
}
|
||||
uc.HandshakeState.Hello.PskIdentities = e.Identities
|
||||
uc.HandshakeState.Hello.PskBinders = e.Binders
|
||||
return nil
|
||||
}
|
||||
|
||||
func (e *HardcodedPreSharedKeyExtension) Len() int {
|
||||
length := 4 // extension type + extension length
|
||||
length += 2 // identities length
|
||||
for _, identity := range e.Identities {
|
||||
length += 2 + len(identity.Label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
length += 2 // binders length
|
||||
for _, binder := range e.Binders {
|
||||
length += len(binder)
|
||||
}
|
||||
return length
|
||||
}
|
||||
|
||||
func (e *HardcodedPreSharedKeyExtension) Read(b []byte) (int, error) {
|
||||
return 0, errors.New("tls: PreSharedKeyExtension shouldn't be read, use ReadWithRawHello() instead")
|
||||
}
|
||||
|
||||
func (e *HardcodedPreSharedKeyExtension) ReadWithRawHello(raw, b []byte) (int, error) {
|
||||
if len(b) < e.Len() {
|
||||
return 0, io.ErrShortBuffer
|
||||
}
|
||||
|
||||
b[0] = byte(extensionPreSharedKey >> 8)
|
||||
b[1] = byte(extensionPreSharedKey)
|
||||
b[2] = byte((e.Len() - 4) >> 8)
|
||||
b[3] = byte(e.Len() - 4)
|
||||
|
||||
// identities length
|
||||
identitiesLength := 0
|
||||
for _, identity := range e.Identities {
|
||||
identitiesLength += 2 + len(identity.Label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
b[4] = byte(identitiesLength >> 8)
|
||||
b[5] = byte(identitiesLength)
|
||||
|
||||
// identities
|
||||
offset := 6
|
||||
for _, identity := range e.Identities {
|
||||
b[offset] = byte(len(identity.Label) >> 8)
|
||||
b[offset+1] = byte(len(identity.Label))
|
||||
offset += 2
|
||||
copy(b[offset:], identity.Label)
|
||||
offset += len(identity.Label)
|
||||
b[offset] = byte(identity.ObfuscatedTicketAge >> 24)
|
||||
b[offset+1] = byte(identity.ObfuscatedTicketAge >> 16)
|
||||
b[offset+2] = byte(identity.ObfuscatedTicketAge >> 8)
|
||||
b[offset+3] = byte(identity.ObfuscatedTicketAge)
|
||||
offset += 4
|
||||
}
|
||||
|
||||
// binders length
|
||||
bindersLength := 0
|
||||
for _, binder := range e.Binders {
|
||||
bindersLength += len(binder) + 1
|
||||
}
|
||||
b[offset] = byte(bindersLength >> 8)
|
||||
b[offset+1] = byte(bindersLength)
|
||||
offset += 2
|
||||
|
||||
// binders
|
||||
for _, binder := range e.Binders {
|
||||
b[offset] = byte(len(binder))
|
||||
offset++
|
||||
copy(b[offset:], binder)
|
||||
offset += len(binder)
|
||||
}
|
||||
|
||||
return e.Len(), io.EOF
|
||||
}
|
||||
|
||||
func (e *HardcodedPreSharedKeyExtension) Write(b []byte) (n int, err error) {
|
||||
fullLen := len(b)
|
||||
s := cryptobyte.String(b)
|
||||
|
||||
var identitiesLength uint16
|
||||
if !s.ReadUint16(&identitiesLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
// identities
|
||||
for identitiesLength > 0 {
|
||||
var identityLength uint16
|
||||
if !s.ReadUint16(&identityLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
identitiesLength -= 2
|
||||
|
||||
if identityLength > identitiesLength {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
var identity []byte
|
||||
if !s.ReadBytes(&identity, int(identityLength)) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
identitiesLength -= identityLength // identity
|
||||
|
||||
var obfuscatedTicketAge uint32
|
||||
if !s.ReadUint32(&obfuscatedTicketAge) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
e.Identities = append(e.Identities, PskIdentity{
|
||||
Label: identity,
|
||||
ObfuscatedTicketAge: obfuscatedTicketAge,
|
||||
})
|
||||
|
||||
identitiesLength -= 4 // obfuscated ticket age
|
||||
}
|
||||
|
||||
var bindersLength uint16
|
||||
if !s.ReadUint16(&bindersLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
// binders
|
||||
for bindersLength > 0 {
|
||||
var binderLength uint8
|
||||
if !s.ReadUint8(&binderLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
bindersLength -= 1
|
||||
|
||||
if uint16(binderLength) > bindersLength {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
var binder []byte
|
||||
if !s.ReadBytes(&binder, int(binderLength)) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
e.Binders = append(e.Binders, binder)
|
||||
|
||||
bindersLength -= uint16(binderLength)
|
||||
}
|
||||
|
||||
return fullLen, nil
|
||||
}
|
||||
|
||||
func (e *HardcodedPreSharedKeyExtension) UnmarshalJSON(data []byte) error {
|
||||
var pskAccepter struct {
|
||||
PskIdentities []PskIdentity `json:"identities"`
|
||||
PskBinders [][]byte `json:"binders"`
|
||||
}
|
||||
|
||||
if err := json.Unmarshal(data, &pskAccepter); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
e.Identities = pskAccepter.PskIdentities
|
||||
e.Binders = pskAccepter.PskBinders
|
||||
return nil
|
||||
}
|
||||
|
|
@ -47,8 +47,8 @@ func ExtensionFromID(id uint16) TLSExtension {
|
|||
return &FakeDelegatedCredentialsExtension{}
|
||||
case extensionSessionTicket:
|
||||
return &SessionTicketExtension{}
|
||||
case extensionPreSharedKey:
|
||||
return &FakePreSharedKeyExtension{}
|
||||
// case extensionPreSharedKey:
|
||||
// return &HardcodedPreSharedKeyExtension{} // TODO: redesign how to create proper PSK from ID
|
||||
// case extensionEarlyData:
|
||||
// return &EarlyDataExtension{}
|
||||
case extensionSupportedVersions:
|
||||
|
|
@ -1893,175 +1893,3 @@ func (e *FakeDelegatedCredentialsExtension) UnmarshalJSON(data []byte) error {
|
|||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// FakePreSharedKeyExtension is an extension used to set the PSK extension in the
|
||||
// ClientHello.
|
||||
//
|
||||
// Unfortunately, even when the PSK extension is set, there will be no PSK-based
|
||||
// resumption since crypto/tls does not implement PSK.
|
||||
type FakePreSharedKeyExtension struct {
|
||||
PskIdentities []PskIdentity `json:"identities"`
|
||||
PskBinders [][]byte `json:"binders"`
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) writeToUConn(uc *UConn) error {
|
||||
if uc.config.ClientSessionCache == nil {
|
||||
return nil // don't write the extension if there is no session cache
|
||||
}
|
||||
if session, ok := uc.config.ClientSessionCache.Get(uc.clientSessionCacheKey()); !ok || session == nil {
|
||||
return nil // don't write the extension if there is no session cache available for this session
|
||||
}
|
||||
uc.HandshakeState.Hello.PskIdentities = e.PskIdentities
|
||||
uc.HandshakeState.Hello.PskBinders = e.PskBinders
|
||||
return nil
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) Len() int {
|
||||
length := 4 // extension type + extension length
|
||||
length += 2 // identities length
|
||||
for _, identity := range e.PskIdentities {
|
||||
length += 2 + len(identity.Label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
length += 2 // binders length
|
||||
for _, binder := range e.PskBinders {
|
||||
length += len(binder)
|
||||
}
|
||||
return length
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) Read(b []byte) (int, error) {
|
||||
if len(b) < e.Len() {
|
||||
return 0, io.ErrShortBuffer
|
||||
}
|
||||
|
||||
b[0] = byte(extensionPreSharedKey >> 8)
|
||||
b[1] = byte(extensionPreSharedKey)
|
||||
b[2] = byte((e.Len() - 4) >> 8)
|
||||
b[3] = byte(e.Len() - 4)
|
||||
|
||||
// identities length
|
||||
identitiesLength := 0
|
||||
for _, identity := range e.PskIdentities {
|
||||
identitiesLength += 2 + len(identity.Label) + 4 // identity length + identity + obfuscated ticket age
|
||||
}
|
||||
b[4] = byte(identitiesLength >> 8)
|
||||
b[5] = byte(identitiesLength)
|
||||
|
||||
// identities
|
||||
offset := 6
|
||||
for _, identity := range e.PskIdentities {
|
||||
b[offset] = byte(len(identity.Label) >> 8)
|
||||
b[offset+1] = byte(len(identity.Label))
|
||||
offset += 2
|
||||
copy(b[offset:], identity.Label)
|
||||
offset += len(identity.Label)
|
||||
b[offset] = byte(identity.ObfuscatedTicketAge >> 24)
|
||||
b[offset+1] = byte(identity.ObfuscatedTicketAge >> 16)
|
||||
b[offset+2] = byte(identity.ObfuscatedTicketAge >> 8)
|
||||
b[offset+3] = byte(identity.ObfuscatedTicketAge)
|
||||
offset += 4
|
||||
}
|
||||
|
||||
// binders length
|
||||
bindersLength := 0
|
||||
for _, binder := range e.PskBinders {
|
||||
bindersLength += len(binder)
|
||||
}
|
||||
b[offset] = byte(bindersLength >> 8)
|
||||
b[offset+1] = byte(bindersLength)
|
||||
offset += 2
|
||||
|
||||
// binders
|
||||
for _, binder := range e.PskBinders {
|
||||
copy(b[offset:], binder)
|
||||
offset += len(binder)
|
||||
}
|
||||
|
||||
return e.Len(), io.EOF
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) Write(b []byte) (n int, err error) {
|
||||
fullLen := len(b)
|
||||
s := cryptobyte.String(b)
|
||||
|
||||
var identitiesLength uint16
|
||||
if !s.ReadUint16(&identitiesLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
// identities
|
||||
for identitiesLength > 0 {
|
||||
var identityLength uint16
|
||||
if !s.ReadUint16(&identityLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
identitiesLength -= 2
|
||||
|
||||
if identityLength > identitiesLength {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
var identity []byte
|
||||
if !s.ReadBytes(&identity, int(identityLength)) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
identitiesLength -= identityLength // identity
|
||||
|
||||
var obfuscatedTicketAge uint32
|
||||
if !s.ReadUint32(&obfuscatedTicketAge) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
e.PskIdentities = append(e.PskIdentities, PskIdentity{
|
||||
Label: identity,
|
||||
ObfuscatedTicketAge: obfuscatedTicketAge,
|
||||
})
|
||||
|
||||
identitiesLength -= 4 // obfuscated ticket age
|
||||
}
|
||||
|
||||
var bindersLength uint16
|
||||
if !s.ReadUint16(&bindersLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
// binders
|
||||
for bindersLength > 0 {
|
||||
var binderLength uint8
|
||||
if !s.ReadUint8(&binderLength) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
bindersLength -= 1
|
||||
|
||||
if uint16(binderLength) > bindersLength {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
var binder []byte
|
||||
if !s.ReadBytes(&binder, int(binderLength)) {
|
||||
return 0, errors.New("tls: invalid PSK extension")
|
||||
}
|
||||
|
||||
e.PskBinders = append(e.PskBinders, binder)
|
||||
|
||||
bindersLength -= uint16(binderLength)
|
||||
}
|
||||
|
||||
return fullLen, nil
|
||||
}
|
||||
|
||||
func (e *FakePreSharedKeyExtension) UnmarshalJSON(data []byte) error {
|
||||
var pskAccepter struct {
|
||||
PskIdentities []PskIdentity `json:"identities"`
|
||||
PskBinders [][]byte `json:"binders"`
|
||||
}
|
||||
|
||||
if err := json.Unmarshal(data, &pskAccepter); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
e.PskIdentities = pskAccepter.PskIdentities
|
||||
e.PskBinders = pskAccepter.PskBinders
|
||||
return nil
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue