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# -*- coding: utf-8 -*-
# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import attr
from zope.interface import implementer
import twisted
import twisted.internet.error
from twisted.internet import defer
from twisted.python.filepath import FilePath
from twisted.python.url import URL
from twisted.web import server, static
from twisted.web.resource import Resource
from synapse.app import check_bind_error
from synapse.crypto.context_factory import ClientTLSOptionsFactory
from synapse.http.federation.matrix_federation_agent import MatrixFederationAgent
logger = logging.getLogger(__name__)
try:
from txacme.interfaces import ICertificateStore
@attr.s
@implementer(ICertificateStore)
class ErsatzStore(object):
"""
A store that only stores in memory.
"""
certs = attr.ib(default=attr.Factory(dict))
def store(self, server_name, pem_objects):
self.certs[server_name] = [o.as_bytes() for o in pem_objects]
return defer.succeed(None)
except ImportError:
# txacme is missing
pass
class AcmeHandler(object):
def __init__(self, hs):
self.hs = hs
self.reactor = hs.get_reactor()
@defer.inlineCallbacks
def start_listening(self):
# Configure logging for txacme, if you need to debug
# from eliot import add_destinations
# from eliot.twisted import TwistedDestination
#
# add_destinations(TwistedDestination())
from txacme.challenges import HTTP01Responder
from txacme.service import AcmeIssuingService
from txacme.endpoint import load_or_create_client_key
from txacme.client import Client
from josepy.jwa import RS256
self._store = ErsatzStore()
responder = HTTP01Responder()
self._issuer = AcmeIssuingService(
cert_store=self._store,
client_creator=(
lambda: Client.from_url(
reactor=self.reactor,
url=URL.from_text(self.hs.config.acme_url),
key=load_or_create_client_key(
FilePath(self.hs.config.config_dir_path)
),
alg=RS256,
)
),
clock=self.reactor,
responders=[responder],
)
well_known = Resource()
well_known.putChild(b'acme-challenge', responder.resource)
responder_resource = Resource()
responder_resource.putChild(b'.well-known', well_known)
responder_resource.putChild(b'check', static.Data(b'OK', b'text/plain'))
srv = server.Site(responder_resource)
bind_addresses = self.hs.config.acme_bind_addresses
for host in bind_addresses:
logger.info(
"Listening for ACME requests on %s:%i", host, self.hs.config.acme_port,
)
try:
self.reactor.listenTCP(
self.hs.config.acme_port,
srv,
interface=host,
)
except twisted.internet.error.CannotListenError as e:
check_bind_error(e, host, bind_addresses)
# Make sure we are registered to the ACME server. There's no public API
# for this, it is usually triggered by startService, but since we don't
# want it to control where we save the certificates, we have to reach in
# and trigger the registration machinery ourselves.
self._issuer._registered = False
yield self._issuer._ensure_registered()
@defer.inlineCallbacks
def provision_certificate(self):
# Retrieve .well-known if it's in use. We do so through the federation
# agent, because that's where the .well-known logic lives.
agent = MatrixFederationAgent(
tls_client_options_factory=ClientTLSOptionsFactory(None),
reactor=self.reactor,
)
delegated = yield agent._get_well_known(bytes(self.hs.hostname, "ascii"))
# If .well-known is in use, use the delegated hostname instead of the
# homeserver's server_name.
if delegated:
cert_name = delegated.decode("ascii")
logger.info(
".well-known is in use, provisioning %s instead of %s",
cert_name, self.hs.hostname,
)
else:
cert_name = self.hs.hostname
logger.warning("Reprovisioning %s", cert_name)
try:
yield self._issuer.issue_cert(cert_name)
except Exception:
logger.exception("Fail!")
raise
logger.warning("Reprovisioned %s, saving.", cert_name)
cert_chain = self._store.certs[cert_name]
try:
with open(self.hs.config.tls_private_key_file, "wb") as private_key_file:
for x in cert_chain:
if x.startswith(b"-----BEGIN RSA PRIVATE KEY-----"):
private_key_file.write(x)
with open(self.hs.config.tls_certificate_file, "wb") as certificate_file:
for x in cert_chain:
if x.startswith(b"-----BEGIN CERTIFICATE-----"):
certificate_file.write(x)
except Exception:
logger.exception("Failed saving!")
raise
defer.returnValue(True)
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