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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
import fileinput
import tempfile
import requests
from leap.common.certs import get_digest
from leap.common import ca_bundle
from .certs import LeapCertificate
from pixelated.config import leap_config
from pixelated.support.tls_adapter import EnforceTLSv1Adapter
REQUESTS_TIMEOUT = 15
class LeapProvider(object):
def __init__(self, server_name):
self.server_name = server_name
self.local_ca_crt = '%s/ca.crt' % leap_config.leap_home
self.provider_json = self.fetch_provider_json()
@property
def provider_api_cert(self):
return str(os.path.join(leap_config.leap_home, 'providers', self.server_name, 'keys', 'client', 'api.pem'))
@property
def combined_cerfificates_path(self):
return str(os.path.join(leap_config.leap_home, 'providers', self.server_name, 'keys', 'client', 'ca_bundle'))
@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_soledad_json(self):
self.soledad_json = self.fetch_soledad_json()
def download_smtp_json(self):
self.smtp_json = self.fetch_smtp_json()
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
directory = self._extract_directory(path)
if not os.path.exists(directory):
os.makedirs(directory)
cert = self.fetch_valid_certificate()
with open(path, 'w') as out:
out.write(cert)
def _extract_directory(self, path):
splited = path.split('/')
splited.pop(-1)
directory = '/'.join(splited)
return directory
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):
hosts = self.smtp_json['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=REQUESTS_TIMEOUT)
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=self.provider_api_cert, timeout=REQUESTS_TIMEOUT)
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=self.provider_api_cert, timeout=REQUESTS_TIMEOUT)
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):
hosts = self.soledad_json['hosts']
host = hosts.keys()[0]
server_url = 'https://%s:%d/user-%s' % \
(hosts[host]['hostname'], hosts[host]['port'], user_uuid)
return server_url
def _discover_nicknym_server(self):
return 'https://nicknym.%s:6425/' % self.domain
def create_combined_bundle_file(self):
leap_ca_bundle = ca_bundle.where()
if self.provider_api_cert == leap_ca_bundle:
return self.provider_api_cert
elif not self.provider_api_cert:
return leap_ca_bundle
with open(self.combined_cerfificates_path, 'w') as fout:
fin = fileinput.input(files=(leap_ca_bundle, self.provider_api_cert))
for line in fin:
fout.write(line)
fin.close()
def setup_ca_bundle(self):
path = os.path.join(leap_config.leap_home, 'providers', self.server_name, 'keys', 'client')
if not os.path.isdir(path):
os.makedirs(path, 0700)
self._download_cert(self.provider_api_cert)
def _download_cert(self, cert_file_name):
cert = self.fetch_valid_certificate()
with open(cert_file_name, 'w') as file:
file.write(cert)
def setup_ca(self):
self.download_certificate()
self.setup_ca_bundle()
self.create_combined_bundle_file()
def download_settings(self):
self.download_soledad_json()
self.download_smtp_json()
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