diff options
Diffstat (limited to 'synapse/config/tls.py')
| -rw-r--r-- | synapse/config/tls.py | 141 |
1 files changed, 97 insertions, 44 deletions
diff --git a/synapse/config/tls.py b/synapse/config/tls.py index b5f2cfd9b7..5fb3486db1 100644 --- a/synapse/config/tls.py +++ b/synapse/config/tls.py @@ -23,9 +23,9 @@ from unpaddedbase64 import encode_base64 from OpenSSL import crypto -from synapse.config._base import Config +from synapse.config._base import Config, ConfigError -logger = logging.getLogger() +logger = logging.getLogger(__name__) class TlsConfig(Config): @@ -45,9 +45,25 @@ class TlsConfig(Config): self.tls_certificate_file = self.abspath(config.get("tls_certificate_path")) self.tls_private_key_file = self.abspath(config.get("tls_private_key_path")) - self._original_tls_fingerprints = config["tls_fingerprints"] + + if self.has_tls_listener(): + if not self.tls_certificate_file: + raise ConfigError( + "tls_certificate_path must be specified if TLS-enabled listeners are " + "configured." + ) + if not self.tls_private_key_file: + raise ConfigError( + "tls_certificate_path must be specified if TLS-enabled listeners are " + "configured." + ) + + self._original_tls_fingerprints = config.get("tls_fingerprints", []) + + if self._original_tls_fingerprints is None: + self._original_tls_fingerprints = [] + self.tls_fingerprints = list(self._original_tls_fingerprints) - self.no_tls = config.get("no_tls", False) # This config option applies to non-federation HTTP clients # (e.g. for talking to recaptcha, identity servers, and such) @@ -60,10 +76,14 @@ class TlsConfig(Config): self.tls_certificate = None self.tls_private_key = None - def is_disk_cert_valid(self): + def is_disk_cert_valid(self, allow_self_signed=True): """ Is the certificate we have on disk valid, and if so, for how long? + Args: + allow_self_signed (bool): Should we allow the certificate we + read to be self signed? + Returns: int: Days remaining of certificate validity. None: No certificate exists. @@ -84,6 +104,12 @@ class TlsConfig(Config): logger.exception("Failed to parse existing certificate off disk!") raise + if not allow_self_signed: + if tls_certificate.get_subject() == tls_certificate.get_issuer(): + raise ValueError( + "TLS Certificate is self signed, and this is not permitted" + ) + # YYYYMMDDhhmmssZ -- in UTC expires_on = datetime.strptime( tls_certificate.get_notAfter().decode('ascii'), "%Y%m%d%H%M%SZ" @@ -92,36 +118,40 @@ class TlsConfig(Config): days_remaining = (expires_on - now).days return days_remaining - def read_certificate_from_disk(self): + def read_certificate_from_disk(self, require_cert_and_key): """ - Read the certificates from disk. - """ - self.tls_certificate = self.read_tls_certificate(self.tls_certificate_file) + Read the certificates and private key from disk. - # Check if it is self-signed, and issue a warning if so. - if self.tls_certificate.get_issuer() == self.tls_certificate.get_subject(): - warnings.warn( - ( - "Self-signed TLS certificates will not be accepted by Synapse 1.0. " - "Please either provide a valid certificate, or use Synapse's ACME " - "support to provision one." + Args: + require_cert_and_key (bool): set to True to throw an error if the certificate + and key file are not given + """ + if require_cert_and_key: + self.tls_private_key = self.read_tls_private_key() + self.tls_certificate = self.read_tls_certificate() + elif self.tls_certificate_file: + # we only need the certificate for the tls_fingerprints. Reload it if we + # can, but it's not a fatal error if we can't. + try: + self.tls_certificate = self.read_tls_certificate() + except Exception as e: + logger.info( + "Unable to read TLS certificate (%s). Ignoring as no " + "tls listeners enabled.", e, ) - ) - - if not self.no_tls: - self.tls_private_key = self.read_tls_private_key(self.tls_private_key_file) self.tls_fingerprints = list(self._original_tls_fingerprints) - # Check that our own certificate is included in the list of fingerprints - # and include it if it is not. - x509_certificate_bytes = crypto.dump_certificate( - crypto.FILETYPE_ASN1, self.tls_certificate - ) - sha256_fingerprint = encode_base64(sha256(x509_certificate_bytes).digest()) - sha256_fingerprints = set(f["sha256"] for f in self.tls_fingerprints) - if sha256_fingerprint not in sha256_fingerprints: - self.tls_fingerprints.append({u"sha256": sha256_fingerprint}) + if self.tls_certificate: + # Check that our own certificate is included in the list of fingerprints + # and include it if it is not. + x509_certificate_bytes = crypto.dump_certificate( + crypto.FILETYPE_ASN1, self.tls_certificate + ) + sha256_fingerprint = encode_base64(sha256(x509_certificate_bytes).digest()) + sha256_fingerprints = set(f["sha256"] for f in self.tls_fingerprints) + if sha256_fingerprint not in sha256_fingerprints: + self.tls_fingerprints.append({u"sha256": sha256_fingerprint}) def default_config(self, config_dir_path, server_name, **kwargs): base_key_name = os.path.join(config_dir_path, server_name) @@ -137,6 +167,8 @@ class TlsConfig(Config): return ( """\ + ## TLS ## + # PEM-encoded X509 certificate for TLS. # This certificate, as of Synapse 1.0, will need to be a valid and verifiable # certificate, signed by a recognised Certificate Authority. @@ -144,10 +176,10 @@ class TlsConfig(Config): # See 'ACME support' below to enable auto-provisioning this certificate via # Let's Encrypt. # - tls_certificate_path: "%(tls_certificate_path)s" + # tls_certificate_path: "%(tls_certificate_path)s" # PEM-encoded private key for TLS - tls_private_key_path: "%(tls_private_key_path)s" + # tls_private_key_path: "%(tls_private_key_path)s" # ACME support: This will configure Synapse to request a valid TLS certificate # for your configured `server_name` via Let's Encrypt. @@ -172,7 +204,7 @@ class TlsConfig(Config): # acme: # ACME support is disabled by default. Uncomment the following line - # to enable it. + # (and tls_certificate_path and tls_private_key_path above) to enable it. # # enabled: true @@ -197,13 +229,6 @@ class TlsConfig(Config): # # reprovision_threshold: 30 - # If your server runs behind a reverse-proxy which terminates TLS connections - # (for both client and federation connections), it may be useful to disable - # All TLS support for incoming connections. Setting no_tls to True will - # do so (and avoid the need to give synapse a TLS private key). - # - # no_tls: True - # List of allowed TLS fingerprints for this server to publish along # with the signing keys for this server. Other matrix servers that # make HTTPS requests to this server will check that the TLS @@ -236,10 +261,38 @@ class TlsConfig(Config): % locals() ) - def read_tls_certificate(self, cert_path): - cert_pem = self.read_file(cert_path, "tls_certificate") - return crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem) + def read_tls_certificate(self): + """Reads the TLS certificate from the configured file, and returns it + + Also checks if it is self-signed, and warns if so + + Returns: + OpenSSL.crypto.X509: the certificate + """ + cert_path = self.tls_certificate_file + logger.info("Loading TLS certificate from %s", cert_path) + cert_pem = self.read_file(cert_path, "tls_certificate_path") + cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_pem) + + # Check if it is self-signed, and issue a warning if so. + if cert.get_issuer() == cert.get_subject(): + warnings.warn( + ( + "Self-signed TLS certificates will not be accepted by Synapse 1.0. " + "Please either provide a valid certificate, or use Synapse's ACME " + "support to provision one." + ) + ) + + return cert + + def read_tls_private_key(self): + """Reads the TLS private key from the configured file, and returns it - def read_tls_private_key(self, private_key_path): - private_key_pem = self.read_file(private_key_path, "tls_private_key") + Returns: + OpenSSL.crypto.PKey: the private key + """ + private_key_path = self.tls_private_key_file + logger.info("Loading TLS key from %s", private_key_path) + private_key_pem = self.read_file(private_key_path, "tls_private_key_path") return crypto.load_privatekey(crypto.FILETYPE_PEM, private_key_pem) |