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fix(reality): imitate target TLS 1.3 post-handshake records #7

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fix(reality): imitate target TLS 1.3 post-handshake records #7

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22 changes: 21 additions & 1 deletion reality.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ import (
"net"
"runtime"
"sync"
"sync/atomic"
"time"

"github.com/metacubex/utls/internal/mlkem"
Expand Down Expand Up @@ -113,10 +114,15 @@ type RealityConfig struct {
LimitFallbackDownload RealityLimitFallback

Config

// postHandshake caches the target's learned post-handshake record
// pattern. It is created lazily and shared with clones so that clones do
// not probe the target again.
postHandshake atomic.Pointer[realityPostHandshakeCache]
}

func (a *RealityConfig) Clone() *RealityConfig {
return &RealityConfig{
c := &RealityConfig{
DialContext: a.DialContext,
Log: a.Log,
Type: a.Type,
Expand All @@ -132,6 +138,8 @@ func (a *RealityConfig) Clone() *RealityConfig {
LimitFallbackDownload: a.LimitFallbackDownload,
Config: *a.Config.Clone(),
}
c.postHandshake.Store(a.postHandshakeCache())
return c
}

type rateLimitedConn struct {
Expand Down Expand Up @@ -212,6 +220,10 @@ type realityServerHandshakeStateTLS13 struct {
ClientTime time.Time
ClientShortId [8]byte
Config *RealityConfig

// firstFlightPostHandshakeRecords counts the records after the server
// Finished that were already mirrored in the first flight.
firstFlightPostHandshakeRecords int
}

func (hs *realityServerHandshakeStateTLS13) handshake() error {
Expand Down Expand Up @@ -296,6 +308,7 @@ func (hs *realityServerHandshakeStateTLS13) handshake() error {
if _, err := c.realityWriteRecord(recordTypeHandshake, []byte{typeNewSessionTicket}); err != nil {
return err
}
hs.firstFlightPostHandshakeRecords++
}
// Note that at this point we could start sending application data without
// waiting for the client's second flight, but the application might not
Expand Down Expand Up @@ -556,6 +569,13 @@ func RealityServer(ctx context.Context, conn net.Conn, config *RealityConfig) (*
if err != nil {
break
}
err = hs.imitatePostHandshakeRecords()
if err != nil {
if config.Log != nil {
config.Log("REALITY remoteAddr: %v hs.imitatePostHandshakeRecords() err: %v", remoteAddr, err)
}
break
}
hs.c.isHandshakeComplete.Store(true)
break
}
Expand Down
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