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authorTomás Touceda <chiiph@leap.se>2013-08-12 16:25:50 -0300
committerTomás Touceda <chiiph@leap.se>2013-08-12 16:25:50 -0300
commit75a1b6e96b789a8d3d4b9b22bbf62e30ffe62751 (patch)
treecc39f23e95bdbff7495cc866e2f51c1c4f54bc32 /src/leap/bitmask/services/eip/eipconfig.py
parent733fd79e1da439604bd45587417fe466a6af9d92 (diff)
parent3c7981e61d3b48f9a000d08056ff79e993c71ce1 (diff)
Merge remote-tracking branch 'kali/feature/create_bitmask_namespace' into develop
Diffstat (limited to 'src/leap/bitmask/services/eip/eipconfig.py')
-rw-r--r--src/leap/bitmask/services/eip/eipconfig.py263
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diff --git a/src/leap/bitmask/services/eip/eipconfig.py b/src/leap/bitmask/services/eip/eipconfig.py
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+# -*- coding: utf-8 -*-
+# eipconfig.py
+# Copyright (C) 2013 LEAP
+#
+# 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, either version 3 of the License, or
+# (at your option) any later version.
+#
+# 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, see <http://www.gnu.org/licenses/>.
+
+"""
+Provider configuration
+"""
+import logging
+import os
+import re
+import time
+
+import ipaddr
+
+from leap.bitmask.config.providerconfig import ProviderConfig
+from leap.bitmask.services.eip.eipspec import get_schema
+from leap.common.check import leap_assert, leap_assert_type
+from leap.common.config.baseconfig import BaseConfig
+
+logger = logging.getLogger(__name__)
+
+
+class VPNGatewaySelector(object):
+ """
+ VPN Gateway selector.
+ """
+ # http://www.timeanddate.com/time/map/
+ equivalent_timezones = {13: -11, 14: -10}
+
+ def __init__(self, eipconfig, tz_offset=None):
+ '''
+ Constructor for VPNGatewaySelector.
+
+ :param eipconfig: a valid EIP Configuration.
+ :type eipconfig: EIPConfig
+ :param tz_offset: use this offset as a local distance to GMT.
+ :type tz_offset: int
+ '''
+ leap_assert_type(eipconfig, EIPConfig)
+
+ self._local_offset = tz_offset
+ if tz_offset is None:
+ tz_offset = self._get_local_offset()
+
+ if tz_offset in self.equivalent_timezones:
+ tz_offset = self.equivalent_timezones[tz_offset]
+
+ self._local_offset = tz_offset
+
+ self._eipconfig = eipconfig
+
+ def get_gateways(self):
+ """
+ Returns the 4 best gateways, sorted by timezone proximity.
+
+ :rtype: list of IPv4Address or IPv6Address object.
+ """
+ gateways_timezones = []
+ locations = self._eipconfig.get_locations()
+ gateways = self._eipconfig.get_gateways()
+
+ for idx, gateway in enumerate(gateways):
+ gateway_location = gateway.get('location')
+ gateway_distance = 99 # if hasn't location -> should go last
+
+ if gateway_location is not None:
+ gw_offset = int(locations[gateway['location']]['timezone'])
+ if gw_offset in self.equivalent_timezones:
+ gw_offset = self.equivalent_timezones[gw_offset]
+
+ gateway_distance = self._get_timezone_distance(gw_offset)
+
+ ip = self._eipconfig.get_gateway_ip(idx)
+ gateways_timezones.append((ip, gateway_distance))
+
+ gateways_timezones = sorted(gateways_timezones,
+ key=lambda gw: gw[1])[:4]
+
+ gateways = [ip for ip, dist in gateways_timezones]
+ return gateways
+
+ def _get_timezone_distance(self, offset):
+ '''
+ Returns the distance between the local timezone and
+ the one with offset 'offset'.
+
+ :param offset: the distance of a timezone to GMT.
+ :type offset: int
+ :returns: distance between local offset and param offset.
+ :rtype: int
+ '''
+ timezones = range(-11, 13)
+ tz1 = offset
+ tz2 = self._local_offset
+ distance = abs(timezones.index(tz1) - timezones.index(tz2))
+ if distance > 12:
+ if tz1 < 0:
+ distance = timezones.index(tz1) + timezones[::-1].index(tz2)
+ else:
+ distance = timezones[::-1].index(tz1) + timezones.index(tz2)
+
+ return distance
+
+ def _get_local_offset(self):
+ '''
+ Returns the distance between GMT and the local timezone.
+
+ :rtype: int
+ '''
+ local_offset = time.timezone
+ if time.daylight:
+ local_offset = time.altzone
+
+ return local_offset / 3600
+
+
+class EIPConfig(BaseConfig):
+ """
+ Provider configuration abstraction class
+ """
+ OPENVPN_ALLOWED_KEYS = ("auth", "cipher", "tls-cipher")
+ OPENVPN_CIPHERS_REGEX = re.compile("[A-Z0-9\-]+")
+
+ def __init__(self):
+ BaseConfig.__init__(self)
+ self._api_version = None
+
+ def _get_schema(self):
+ """
+ Returns the schema corresponding to the version given.
+
+ :rtype: dict or None if the version is not supported.
+ """
+ return get_schema(self._api_version)
+
+ def get_clusters(self):
+ # TODO: create an abstraction for clusters
+ return self._safe_get_value("clusters")
+
+ def get_gateways(self):
+ # TODO: create an abstraction for gateways
+ return self._safe_get_value("gateways")
+
+ def get_locations(self):
+ '''
+ Returns a list of locations
+
+ :rtype: dict
+ '''
+ return self._safe_get_value("locations")
+
+ def get_openvpn_configuration(self):
+ """
+ Returns a dictionary containing the openvpn configuration
+ parameters.
+
+ These are sanitized with alphanumeric whitelist.
+
+ :returns: openvpn configuration dict
+ :rtype: C{dict}
+ """
+ ovpncfg = self._safe_get_value("openvpn_configuration")
+ config = {}
+ for key, value in ovpncfg.items():
+ if key in self.OPENVPN_ALLOWED_KEYS and value is not None:
+ sanitized_val = self.OPENVPN_CIPHERS_REGEX.findall(value)
+ if len(sanitized_val) != 0:
+ _val = sanitized_val[0]
+ config[str(key)] = str(_val)
+ return config
+
+ def get_serial(self):
+ return self._safe_get_value("serial")
+
+ def get_version(self):
+ return self._safe_get_value("version")
+
+ def get_gateway_ip(self, index=0):
+ """
+ Returns the ip of the gateway.
+
+ :rtype: An IPv4Address or IPv6Address object.
+ """
+ gateways = self.get_gateways()
+ leap_assert(len(gateways) > 0, "We don't have any gateway!")
+ if index > len(gateways):
+ index = 0
+ logger.warning("Provided an unknown gateway index %s, " +
+ "defaulting to 0")
+ ip_addr_str = gateways[index]["ip_address"]
+
+ try:
+ ipaddr.IPAddress(ip_addr_str)
+ return ip_addr_str
+ except ValueError:
+ logger.error("Invalid ip address in config: %s" % (ip_addr_str,))
+ return None
+
+ def get_client_cert_path(self,
+ providerconfig=None,
+ about_to_download=False):
+ """
+ Returns the path to the certificate used by openvpn
+ """
+
+ leap_assert(providerconfig, "We need a provider")
+ leap_assert_type(providerconfig, ProviderConfig)
+
+ cert_path = os.path.join(self.get_path_prefix(),
+ "leap",
+ "providers",
+ providerconfig.get_domain(),
+ "keys",
+ "client",
+ "openvpn.pem")
+
+ if not about_to_download:
+ leap_assert(os.path.exists(cert_path),
+ "You need to download the certificate first")
+ logger.debug("Using OpenVPN cert %s" % (cert_path,))
+
+ return cert_path
+
+
+if __name__ == "__main__":
+ logger = logging.getLogger(name='leap')
+ logger.setLevel(logging.DEBUG)
+ console = logging.StreamHandler()
+ console.setLevel(logging.DEBUG)
+ formatter = logging.Formatter(
+ '%(asctime)s '
+ '- %(name)s - %(levelname)s - %(message)s')
+ console.setFormatter(formatter)
+ logger.addHandler(console)
+
+ eipconfig = EIPConfig('1')
+
+ try:
+ eipconfig.get_clusters()
+ except Exception as e:
+ assert isinstance(e, AssertionError), "Expected an assert"
+ print "Safe value getting is working"
+
+ if eipconfig.load("leap/providers/bitmask.net/eip-service.json"):
+ print eipconfig.get_clusters()
+ print eipconfig.get_gateways()
+ print eipconfig.get_locations()
+ print eipconfig.get_openvpn_configuration()
+ print eipconfig.get_serial()
+ print eipconfig.get_version()