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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 datetime
import time
import ipaddr
from leap.common.check import leap_assert, leap_assert_type
from leap.common.config.baseconfig import BaseConfig
from leap.config.providerconfig import ProviderConfig
from leap.services.eip.eipspec import eipservice_config_spec
logger = logging.getLogger(__name__)
class VPNGatewaySelector(object):
"""
VPN Gateway selector.
"""
def __init__(self, eipconfig):
'''
Constructor for VPNGatewaySelector.
:param eipconfig: a valid EIP Configuration.
:type eipconfig: EIPConfig
'''
leap_assert_type(eipconfig, EIPConfig)
self._local_offset = 0 # defaults to GMT
self._local_timezone = None
self._set_local_offset()
self._eipconfig = eipconfig
def _get_best_gateway(self):
"""
Returns index of the closest gateway, using timezones offsets.
:rtype: int
"""
best_gateway = (-1, 99) # gateway, distance
locations = self._eipconfig.get_locations()
gateways = self._eipconfig.get_gateways()
for idx, gateway in enumerate(gateways):
gateway_offset = int(locations[gateway['location']]['timezone'])
gateway_distance = self._get_timezone_distance(gateway_offset)
if gateway_distance < best_gateway[1]:
best_gateway = (idx, gateway_distance)
return best_gateway[0]
def get_best_gateway_ip(self):
"""
Returns the ip of the best possible gateway.
:rtype: An IPv4Address or IPv6Address object.
"""
best_gateway = self._get_best_gateway()
gateway_ip = self._eipconfig.get_gateway_ip(best_gateway)
return gateway_ip
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
'''
delta1 = datetime.timedelta(hours=offset)
delta2 = self._local_offset
diff = abs(delta1 - delta2)
hours = diff.seconds / (60 * 60)
return hours
def _set_local_offset(self):
'''
Sets the distance between GMT and the local timezone.
'''
local_offset = time.timezone
if time.daylight:
local_offset = time.altzone
self._local_offset = datetime.timedelta(seconds=-local_offset)
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)
def _get_spec(self):
"""
Returns the spec object for the specific configuration
"""
return eipservice_config_spec
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[0]["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()
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_openvpn_configuration()
print eipconfig.get_serial()
print eipconfig.get_version()
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