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#
# Copyright (c) 2014 ThoughtWorks, Inc.
#
# Pixelated is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Pixelated 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
import json
import os
from leap.common.certs import get_digest
import requests
from .certs import LeapCertificate
from pixelated.support.tls_adapter import EnforceTLSv1Adapter
from pixelated.bitmask_libraries.soledad import SoledadDiscoverException
class LeapProvider(object):
def __init__(self, server_name, config):
self.server_name = server_name
self.config = config
self.local_ca_crt = '%s/ca.crt' % self.config.leap_home
self.provider_json = self.fetch_provider_json()
@property
def api_uri(self):
return self.provider_json.get('api_uri')
@property
def ca_cert_fingerprint(self):
return self.provider_json.get('ca_cert_fingerprint')
@property
def ca_cert_uri(self):
return self.provider_json.get('ca_cert_uri')
@property
def api_version(self):
return self.provider_json.get('api_version')
@property
def domain(self):
return self.provider_json.get('domain')
@property
def services(self):
return self.provider_json.get('services')
def __hash__(self):
return hash(self.server_name)
def __eq__(self, other):
return self.server_name == other.server_name
def ensure_supports_mx(self):
if 'mx' not in self.services:
raise Exception
def download_certificate(self, filename=None):
"""
Downloads the server certificate, validates it against the provided fingerprint and stores it to file
"""
path = filename or self.local_ca_crt
cert = self.fetch_valid_certificate()
with open(path, 'w') as out:
out.write(cert)
def fetch_valid_certificate(self):
cert = self._fetch_certificate()
self.validate_certificate(cert)
return cert
def _fetch_certificate(self):
cert_url = '%s/ca.crt' % self._provider_base_url()
response = self._validated_get(cert_url)
cert_data = response.content
return cert_data
def validate_certificate(self, cert_data=None):
if cert_data is None:
cert_data = self._fetch_certificate()
parts = str(self.ca_cert_fingerprint).split(':')
method = parts[0].strip()
fingerprint = parts[1].strip()
digest = get_digest(cert_data, method)
if fingerprint.strip() != digest:
raise Exception('Certificate fingerprints don\'t match! Expected [%s] but got [%s]' % (fingerprint.strip(), digest))
def smtp_info(self):
json_data = self.fetch_smtp_json()
hosts = json_data['hosts']
hostname = hosts.keys()[0]
host = hosts[hostname]
return host['hostname'], host['port']
def _validated_get(self, url):
session = requests.session()
try:
session.mount('https://', EnforceTLSv1Adapter(assert_fingerprint=LeapCertificate.LEAP_FINGERPRINT))
response = session.get(url, verify=LeapCertificate(self).provider_web_cert, timeout=self.config.timeout_in_s)
response.raise_for_status()
return response
finally:
session.close()
def fetch_provider_json(self):
url = '%s/provider.json' % self._provider_base_url()
response = self._validated_get(url)
json_data = json.loads(response.content)
return json_data
def fetch_soledad_json(self):
service_url = "%s/%s/config/soledad-service.json" % (
self.api_uri, self.api_version)
response = requests.get(service_url, verify=LeapCertificate(self).provider_api_cert, timeout=self.config.timeout_in_s)
response.raise_for_status()
return json.loads(response.content)
def fetch_smtp_json(self):
service_url = '%s/%s/config/smtp-service.json' % (
self.api_uri, self.api_version)
response = requests.get(service_url, verify=LeapCertificate(self).provider_api_cert, timeout=self.config.timeout_in_s)
response.raise_for_status()
return json.loads(response.content)
def _provider_base_url(self):
return 'https://%s' % self.server_name
def address_for(self, username):
return '%s@%s' % (username, self.domain)
def discover_soledad_server(self, user_uuid):
try:
json_data = self.fetch_soledad_json()
hosts = json_data['hosts']
host = hosts.keys()[0]
server_url = 'https://%s:%d/user-%s' % \
(hosts[host]['hostname'], hosts[host]['port'],
user_uuid)
return server_url
except Exception, e:
raise SoledadDiscoverException(e)
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