188 lines
7.3 KiB
Python
188 lines
7.3 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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from typing import Any, List, Optional, Pattern
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from matrix_common.regex import glob_to_regex
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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.types import JsonDict
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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: JsonDict, **kwargs: Any) -> None:
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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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"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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# 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: 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: Optional[crypto.X509] = None
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self.tls_private_key: Optional[crypto.PKey] = None
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def read_certificate_from_disk(self) -> None:
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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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tls_certificate_path: Optional[str],
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tls_private_key_path: Optional[str],
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**kwargs: Any,
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) -> str:
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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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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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if tls_certificate_path and tls_private_key_path:
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return f"""\
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tls_certificate_path: {tls_certificate_path}
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tls_private_key_path: {tls_private_key_path}
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"""
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else:
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return ""
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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.encode())
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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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