#!/usr/bin/python
# Authors:
#     Christina Fu <cfu@redhat.com>
#     Endi S. Dewata <edewata@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright (C) 2014 Red Hat, Inc.
# All rights reserved.
#

from __future__ import absolute_import
import os
from lxml import etree

import pki.server.upgrade


class AddTLSRangeSupport(pki.server.upgrade.PKIServerUpgradeScriptlet):

    def __init__(self):
        super(AddTLSRangeSupport, self).__init__()
        self.message = 'Add TLS Range Support'

        self.parser = etree.XMLParser(remove_blank_text=True)

    def upgrade_instance(self, instance):

        server_xml = os.path.join(instance.conf_dir, 'server.xml')
        # Backup the file before modify
        self.backup(server_xml)
        # Parse the server.xml into an XML object
        document = etree.parse(server_xml, self.parser)
        # perform the upgrade in memory
        self.add_tls_range(document)
        # Once all changes are made, write the XML back into the same server.xml
        # This way we're preserving any other customization that has been done
        # to the server.xml
        with open(server_xml, 'wb') as f:
            document.write(f, pretty_print=True, encoding='utf-8')

    def add_tls_range(self, document):

        # Find existing Connector
        server = document.getroot()
        connectors = server.findall('.//Connector')

        for connector in connectors:

            secure = connector.get('secure')
            if secure == 'true':
                # Update Connector's attributes
                connector.set('strictCiphers', 'true')
                connector.set('sslVersionRangeStream', 'tls1_0:tls1_2')
                connector.set('sslVersionRangeDatagram', 'tls1_1:tls1_2')
                connector.set('sslRangeCiphers',
                              '-TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,'
                              '-TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,'
                              '+TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,'
                              '+TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,'
                              '+TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,'
                              '-TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,'
                              '+TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,'
                              '+TLS_RSA_WITH_3DES_EDE_CBC_SHA,'
                              '+TLS_RSA_WITH_AES_128_CBC_SHA,'
                              '+TLS_RSA_WITH_AES_256_CBC_SHA,'
                              '+TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,'
                              '+TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,'
                              '-TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,'
                              '-TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,'
                              '-TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,'
                              '+TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,'
                              '+TLS_DHE_DSS_WITH_AES_128_CBC_SHA,'
                              '+TLS_DHE_DSS_WITH_AES_256_CBC_SHA,'
                              '+TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,'
                              '+TLS_DHE_RSA_WITH_AES_128_CBC_SHA,'
                              '+TLS_DHE_RSA_WITH_AES_256_CBC_SHA,'
                              '+TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,'
                              '+TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,'
                              '+TLS_RSA_WITH_AES_128_CBC_SHA256,'
                              '+TLS_RSA_WITH_AES_256_CBC_SHA256,'
                              '+TLS_RSA_WITH_AES_128_GCM_SHA256,'
                              '+TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,'
                              '+TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,'
                              '+TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,'
                              '+TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,'
                              '+TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,'
                              '+TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,'
                              '+TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,'
                              '+TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256')
