AmqpLink.py 文件源码

def __get_ssl_context(cls, sslca=None):
        """Make an SSLConext for this Python version using public or sslca
        """
        if ((version_info[0] == 2 and (version_info[1] >= 7 and version_info[2] >= 5)) or
                (version_info[0] == 3 and version_info[1] >= 4)):
            logger.debug('SSL method for 2.7.5+ / 3.4+')
            # pylint: disable=no-name-in-module
            from ssl import SSLContext, PROTOCOL_TLSv1_2, CERT_REQUIRED, OP_NO_COMPRESSION
            ctx = SSLContext(PROTOCOL_TLSv1_2)
            ctx.set_ciphers('HIGH:!SSLv3:!TLSv1:!aNULL:@STRENGTH')
            # see CRIME security exploit
            ctx.options |= OP_NO_COMPRESSION
            # the following options are used to verify the identity of the broker
            if sslca:
                ctx.load_verify_locations(sslca)
                ctx.verify_mode = CERT_REQUIRED
                ctx.check_hostname = False
            else:
                # Verify public certifcates if sslca is None (default)
                from ssl import Purpose  # pylint: disable=no-name-in-module
                ctx.load_default_certs(purpose=Purpose.SERVER_AUTH)
                ctx.verify_mode = CERT_REQUIRED
                ctx.check_hostname = True

        elif version_info[0] == 3 and version_info[1] < 4:
            logger.debug('Using SSL method for 3.2+, < 3.4')
            # pylint: disable=no-name-in-module
            from ssl import SSLContext, CERT_REQUIRED, PROTOCOL_SSLv23, OP_NO_SSLv2, OP_NO_SSLv3, OP_NO_TLSv1
            ctx = SSLContext(PROTOCOL_SSLv23)
            ctx.options |= (OP_NO_SSLv2 | OP_NO_SSLv3 | OP_NO_TLSv1)
            ctx.set_ciphers('HIGH:!SSLv3:!TLSv1:!aNULL:@STRENGTH')
            # the following options are used to verify the identity of the broker
            if sslca:
                ctx.load_verify_locations(sslca)
                ctx.verify_mode = CERT_REQUIRED
            else:
                # Verify public certifcates if sslca is None (default)
                ctx.set_default_verify_paths()
                ctx.verify_mode = CERT_REQUIRED

        else:
            raise Exception("Unsupported Python version %s" % '.'.join(str(item) for item in version_info[:3]))

        return ctx