311 lines
12 KiB
Python
311 lines
12 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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import os
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from datetime import datetime
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from typing import List, Optional, Pattern
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from OpenSSL import SSL, crypto
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from twisted.internet._sslverify import Certificate, trustRootFromCertificates
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from synapse.config._base import Config, ConfigError
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from synapse.util import glob_to_regex
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logger = logging.getLogger(__name__)
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class TlsConfig(Config):
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section = "tls"
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def read_config(self, config: dict, config_dir_path: str, **kwargs):
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self.tls_certificate_file = self.abspath(config.get("tls_certificate_path"))
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self.tls_private_key_file = self.abspath(config.get("tls_private_key_path"))
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if self.root.server.has_tls_listener():
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if not self.tls_certificate_file:
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raise ConfigError(
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"tls_certificate_path must be specified if TLS-enabled listeners are "
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"configured."
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)
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if not self.tls_private_key_file:
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raise ConfigError(
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"tls_private_key_path must be specified if TLS-enabled listeners are "
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"configured."
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)
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# Whether to verify certificates on outbound federation traffic
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self.federation_verify_certificates = config.get(
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"federation_verify_certificates", True
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)
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# Minimum TLS version to use for outbound federation traffic
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self.federation_client_minimum_tls_version = str(
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config.get("federation_client_minimum_tls_version", 1)
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)
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if self.federation_client_minimum_tls_version not in ["1", "1.1", "1.2", "1.3"]:
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raise ConfigError(
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"federation_client_minimum_tls_version must be one of: 1, 1.1, 1.2, 1.3"
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)
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# Prevent people shooting themselves in the foot here by setting it to
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# the biggest number blindly
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if self.federation_client_minimum_tls_version == "1.3":
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if getattr(SSL, "OP_NO_TLSv1_3", None) is None:
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raise ConfigError(
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(
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"federation_client_minimum_tls_version cannot be 1.3, "
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"your OpenSSL does not support it"
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)
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)
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# Whitelist of domains to not verify certificates for
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fed_whitelist_entries = config.get(
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"federation_certificate_verification_whitelist", []
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)
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if fed_whitelist_entries is None:
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fed_whitelist_entries = []
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# Support globs (*) in whitelist values
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self.federation_certificate_verification_whitelist = [] # type: List[Pattern]
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for entry in fed_whitelist_entries:
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try:
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entry_regex = glob_to_regex(entry.encode("ascii").decode("ascii"))
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except UnicodeEncodeError:
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raise ConfigError(
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"IDNA domain names are not allowed in the "
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"federation_certificate_verification_whitelist: %s" % (entry,)
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)
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# Convert globs to regex
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self.federation_certificate_verification_whitelist.append(entry_regex)
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# List of custom certificate authorities for federation traffic validation
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custom_ca_list = config.get("federation_custom_ca_list", None)
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# Read in and parse custom CA certificates
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self.federation_ca_trust_root = None
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if custom_ca_list is not None:
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if len(custom_ca_list) == 0:
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# A trustroot cannot be generated without any CA certificates.
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# Raise an error if this option has been specified without any
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# corresponding certificates.
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raise ConfigError(
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"federation_custom_ca_list specified without "
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"any certificate files"
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)
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certs = []
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for ca_file in custom_ca_list:
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logger.debug("Reading custom CA certificate file: %s", ca_file)
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content = self.read_file(ca_file, "federation_custom_ca_list")
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# Parse the CA certificates
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try:
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cert_base = Certificate.loadPEM(content)
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certs.append(cert_base)
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except Exception as e:
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raise ConfigError(
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"Error parsing custom CA certificate file %s: %s" % (ca_file, e)
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)
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self.federation_ca_trust_root = trustRootFromCertificates(certs)
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# This config option applies to non-federation HTTP clients
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# (e.g. for talking to recaptcha, identity servers, and such)
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# It should never be used in production, and is intended for
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# use only when running tests.
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self.use_insecure_ssl_client_just_for_testing_do_not_use = config.get(
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"use_insecure_ssl_client_just_for_testing_do_not_use"
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)
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self.tls_certificate = None # type: Optional[crypto.X509]
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self.tls_private_key = None # type: Optional[crypto.PKey]
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def is_disk_cert_valid(self, allow_self_signed=True):
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"""
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Is the certificate we have on disk valid, and if so, for how long?
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Args:
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allow_self_signed (bool): Should we allow the certificate we
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read to be self signed?
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Returns:
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int: Days remaining of certificate validity.
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None: No certificate exists.
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"""
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if not os.path.exists(self.tls_certificate_file):
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return None
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try:
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with open(self.tls_certificate_file, "rb") as f:
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cert_pem = f.read()
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except Exception as e:
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raise ConfigError(
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"Failed to read existing certificate file %s: %s"
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% (self.tls_certificate_file, e)
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)
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try:
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tls_certificate = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
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except Exception as e:
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raise ConfigError(
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"Failed to parse existing certificate file %s: %s"
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% (self.tls_certificate_file, e)
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)
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if not allow_self_signed:
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if tls_certificate.get_subject() == tls_certificate.get_issuer():
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raise ValueError(
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"TLS Certificate is self signed, and this is not permitted"
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)
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# YYYYMMDDhhmmssZ -- in UTC
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expires_on = datetime.strptime(
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tls_certificate.get_notAfter().decode("ascii"), "%Y%m%d%H%M%SZ"
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)
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now = datetime.utcnow()
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days_remaining = (expires_on - now).days
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return days_remaining
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def read_certificate_from_disk(self):
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"""
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Read the certificates and private key from disk.
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"""
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self.tls_private_key = self.read_tls_private_key()
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self.tls_certificate = self.read_tls_certificate()
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def generate_config_section(
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self,
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config_dir_path,
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server_name,
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data_dir_path,
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tls_certificate_path,
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tls_private_key_path,
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**kwargs,
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):
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"""If the TLS paths are not specified the default will be certs in the
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config directory"""
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base_key_name = os.path.join(config_dir_path, server_name)
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if bool(tls_certificate_path) != bool(tls_private_key_path):
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raise ConfigError(
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"Please specify both a cert path and a key path or neither."
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)
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tls_enabled = "" if tls_certificate_path and tls_private_key_path else "#"
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if not tls_certificate_path:
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tls_certificate_path = base_key_name + ".tls.crt"
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if not tls_private_key_path:
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tls_private_key_path = base_key_name + ".tls.key"
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# flake8 doesn't recognise that variables are used in the below string
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_ = tls_enabled
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return (
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"""\
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## TLS ##
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# PEM-encoded X509 certificate for TLS.
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# This certificate, as of Synapse 1.0, will need to be a valid and verifiable
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# certificate, signed by a recognised Certificate Authority.
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#
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# Be sure to use a `.pem` file that includes the full certificate chain including
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# any intermediate certificates (for instance, if using certbot, use
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# `fullchain.pem` as your certificate, not `cert.pem`).
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#
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%(tls_enabled)stls_certificate_path: "%(tls_certificate_path)s"
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# PEM-encoded private key for TLS
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#
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%(tls_enabled)stls_private_key_path: "%(tls_private_key_path)s"
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# Whether to verify TLS server certificates for outbound federation requests.
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#
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# Defaults to `true`. To disable certificate verification, uncomment the
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# following line.
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#
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#federation_verify_certificates: false
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# The minimum TLS version that will be used for outbound federation requests.
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#
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# Defaults to `1`. Configurable to `1`, `1.1`, `1.2`, or `1.3`. Note
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# that setting this value higher than `1.2` will prevent federation to most
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# of the public Matrix network: only configure it to `1.3` if you have an
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# entirely private federation setup and you can ensure TLS 1.3 support.
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#
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#federation_client_minimum_tls_version: 1.2
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# Skip federation certificate verification on the following whitelist
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# of domains.
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#
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# This setting should only be used in very specific cases, such as
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# federation over Tor hidden services and similar. For private networks
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# of homeservers, you likely want to use a private CA instead.
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#
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# Only effective if federation_verify_certicates is `true`.
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#
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#federation_certificate_verification_whitelist:
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# - lon.example.com
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# - *.domain.com
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# - *.onion
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# List of custom certificate authorities for federation traffic.
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#
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# This setting should only normally be used within a private network of
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# homeservers.
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#
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# Note that this list will replace those that are provided by your
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# operating environment. Certificates must be in PEM format.
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#
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#federation_custom_ca_list:
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# - myCA1.pem
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# - myCA2.pem
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# - myCA3.pem
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"""
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# Lowercase the string representation of boolean values
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% {
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x[0]: str(x[1]).lower() if isinstance(x[1], bool) else x[1]
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for x in locals().items()
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}
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)
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def read_tls_certificate(self) -> crypto.X509:
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"""Reads the TLS certificate from the configured file, and returns it
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Returns:
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The certificate
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"""
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cert_path = self.tls_certificate_file
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logger.info("Loading TLS certificate from %s", cert_path)
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cert_pem = self.read_file(cert_path, "tls_certificate_path")
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cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem)
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return cert
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def read_tls_private_key(self) -> crypto.PKey:
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"""Reads the TLS private key from the configured file, and returns it
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Returns:
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The private key
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"""
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private_key_path = self.tls_private_key_file
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logger.info("Loading TLS key from %s", private_key_path)
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private_key_pem = self.read_file(private_key_path, "tls_private_key_path")
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return crypto.load_privatekey(crypto.FILETYPE_PEM, private_key_pem)
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