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TLS for WSS/HUS: Allow outer "alpn": ["h2", "http/1.1"] for camouflage (#6034)

Browse Source 
https://github.com/XTLS/Xray-core/pull/6034#issuecomment-4363639160

Closes https://github.com/XTLS/Xray-core/issues/6024#issuecomment-4328306231
This commit is contained in:
风扇滑翔翼
2026-05-02 19:07:12 +08:00
committed by GitHub
parent 1fc6850dc4
commit 16568314d8
1 changed files with 15 additions and 10 deletions
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25
transport/internet/tls/tls.go
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@@ -5,6 +5,7 @@ import (
"crypto/rand"
"crypto/tls"
"math/big"
"slices"
"time"
utls "github.com/refraction-networking/utls"
@@ -90,18 +91,24 @@ func (c *UConn) HandshakeContextServerName(ctx context.Context) string {
return c.ConnectionState().ServerName
}
// WebsocketHandshake basically calls UConn.Handshake inside it but it will only send
// http/1.1 in its ALPN.
// WebsocketHandshakeContext basically calls UConn.Handshake inside it but it will try
// to build outer ALPN to `http/1.1` or `h2 http/1.1` (if manually specified for camouflage)
func (c *UConn) WebsocketHandshakeContext(ctx context.Context) error {
config := *utils.AccessField[*utls.Config](c, "config")
ALPN := slices.Clone(config.NextProtos)
// set other kinds of ALPN to http/1.1
if !slices.Equal(ALPN, []string{"h2", "http/1.1"}) {
ALPN = []string{"http/1.1"}
}
// Build the handshake state. This will apply every variable of the TLS of the
// fingerprint in the UConn
if err := c.BuildHandshakeState(); err != nil {
return err
}
config := *utils.AccessField[*utls.Config](c, "config")
// Do not modify outer ALPN to http/1.1 if ECH is used
// Outer ALPN will be h2,http/1.1, and real ALPN in config will be hidden in ECH
// Do not modify outer ALPN if ECH is used
// Outer ALPN will be h2,http/1.1, and real http/1.1 in config will be hidden in ECH
if config.EncryptedClientHelloConfigList != nil {
config.NextProtos = []string{"http/1.1"}
return c.HandshakeContext(ctx)
}
// Iterate over extensions and check for utls.ALPNExtension
@@ -109,12 +116,12 @@ func (c *UConn) WebsocketHandshakeContext(ctx context.Context) error {
for _, extension := range c.Extensions {
if alpn, ok := extension.(*utls.ALPNExtension); ok {
hasALPNExtension = true
alpn.AlpnProtocols = []string{"http/1.1"}
alpn.AlpnProtocols = ALPN
break
}
}
if !hasALPNExtension { // Append extension if doesn't exists
c.Extensions = append(c.Extensions, &utls.ALPNExtension{AlpnProtocols: []string{"http/1.1"}})
c.Extensions = append(c.Extensions, &utls.ALPNExtension{AlpnProtocols: ALPN})
}
// Rebuild the client hello and do the handshake
if err := c.BuildHandshakeState(); err != nil {
@@ -146,9 +153,7 @@ func copyConfig(c *tls.Config) *utls.Config {
VerifyPeerCertificate: c.VerifyPeerCertificate,
KeyLogWriter: c.KeyLogWriter,
EncryptedClientHelloConfigList: c.EncryptedClientHelloConfigList,
}
if config.EncryptedClientHelloConfigList != nil {
config.NextProtos = c.NextProtos
NextProtos: c.NextProtos,
}
return config
}