Method should_add_ServerHello

scapy/layers/tls/automaton_srv.py:367–387

Selecting a cipher suite should be no trouble as we already caught the None case previously.

(self)

    @ATMT.condition(PREPARE_SERVERFLIGHT1)
    def should_add_ServerHello(self):
        """
        Selecting a cipher suite should be no trouble as we already caught
        the None case previously.
        """
        if isinstance(self.mykey, PrivKeyRSA):
            kx = "RSA"
        elif isinstance(self.mykey, PrivKeyECDSA):
            kx = "ECDSA"
        elif isinstance(self.mykey, PrivKeyEdDSA):
            kx = ""
        usable_suites = get_usable_ciphersuites(self.cur_pkt.ciphers, kx)
        c = usable_suites[0]
        if self.preferred_ciphersuite in usable_suites:
            c = self.preferred_ciphersuite

        # Some extensions
        ext = [TLS_Ext_RenegotiationInfo()]

        self.add_msg(TLSServerHello(cipher=c, ext=ext))
        raise self.ADDED_SERVERHELLO()

    @ATMT.state()
    def ADDED_SERVERHELLO(self):