Require ECDH key exchange & remove dh_params (#4429)
* remove dh_params and set better cipher string
This commit is contained in:
Amber Brown
GitHub
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83f335bedf
commit
23b0813599
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@ -220,7 +220,7 @@ is configured to use TLS with a self-signed certificate. If you would like
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to do initial test with a client without having to setup a reverse proxy,
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you can temporarly use another certificate. (Note that a self-signed
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certificate is fine for `Federation`_). You can do so by changing
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``tls_certificate_path``, ``tls_private_key_path`` and ``tls_dh_params_path``
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``tls_certificate_path`` and ``tls_private_key_path``
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in ``homeserver.yaml``; alternatively, you can use a reverse-proxy, but be sure
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to read `Using a reverse proxy with Synapse`_ when doing so.
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@ -0,0 +1 @@
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Synapse's cipher string has been updated to require ECDH key exchange. Configuring and generating dh_params is no longer required, and they will be ignored.
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@ -9,9 +9,6 @@ tls_certificate_path: "/etc/matrix-synapse/homeserver.tls.crt"
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# PEM encoded private key for TLS
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tls_private_key_path: "/etc/matrix-synapse/homeserver.tls.key"
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# PEM dh parameters for ephemeral keys
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tls_dh_params_path: "/etc/matrix-synapse/homeserver.tls.dh"
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# Don't bind to the https port
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no_tls: False
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@ -1,9 +0,0 @@
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2048-bit DH parameters taken from rfc3526
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-----BEGIN DH PARAMETERS-----
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MIIBCAKCAQEA///////////JD9qiIWjCNMTGYouA3BzRKQJOCIpnzHQCC76mOxOb
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IlFKCHmONATd75UZs806QxswKwpt8l8UN0/hNW1tUcJF5IW1dmJefsb0TELppjft
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awv/XLb0Brft7jhr+1qJn6WunyQRfEsf5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT
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mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVSu57VKQdwlpZtZww1Tkq8mATxdGwIyhgh
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fDKQXkYuNs474553LBgOhgObJ4Oi7Aeij7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq
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5RXSJhiY+gUQFXKOWoqsqmj//////////wIBAg==
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-----END DH PARAMETERS-----
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@ -4,7 +4,6 @@
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tls_certificate_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.crt"
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tls_private_key_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.key"
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tls_dh_params_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.dh"
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no_tls: {{ "True" if SYNAPSE_NO_TLS else "False" }}
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tls_fingerprints: []
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@ -14,7 +14,6 @@
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# limitations under the License.
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import os
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import subprocess
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from hashlib import sha256
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from unpaddedbase64 import encode_base64
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@ -23,8 +22,6 @@ from OpenSSL import crypto
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from ._base import Config
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GENERATE_DH_PARAMS = False
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class TlsConfig(Config):
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def read_config(self, config):
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@ -42,10 +39,6 @@ class TlsConfig(Config):
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config.get("tls_private_key_path")
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)
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self.tls_dh_params_path = self.check_file(
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config.get("tls_dh_params_path"), "tls_dh_params"
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)
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self.tls_fingerprints = config["tls_fingerprints"]
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# Check that our own certificate is included in the list of fingerprints
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@ -72,7 +65,6 @@ class TlsConfig(Config):
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tls_certificate_path = base_key_name + ".tls.crt"
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tls_private_key_path = base_key_name + ".tls.key"
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tls_dh_params_path = base_key_name + ".tls.dh"
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return """\
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# PEM encoded X509 certificate for TLS.
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@ -85,9 +77,6 @@ class TlsConfig(Config):
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# PEM encoded private key for TLS
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tls_private_key_path: "%(tls_private_key_path)s"
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# PEM dh parameters for ephemeral keys
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tls_dh_params_path: "%(tls_dh_params_path)s"
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# Don't bind to the https port
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no_tls: False
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@ -131,7 +120,6 @@ class TlsConfig(Config):
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def generate_files(self, config):
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tls_certificate_path = config["tls_certificate_path"]
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tls_private_key_path = config["tls_private_key_path"]
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tls_dh_params_path = config["tls_dh_params_path"]
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if not self.path_exists(tls_private_key_path):
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with open(tls_private_key_path, "wb") as private_key_file:
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@ -165,31 +153,3 @@ class TlsConfig(Config):
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cert_pem = crypto.dump_certificate(crypto.FILETYPE_PEM, cert)
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certificate_file.write(cert_pem)
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if not self.path_exists(tls_dh_params_path):
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if GENERATE_DH_PARAMS:
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subprocess.check_call([
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"openssl", "dhparam",
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"-outform", "PEM",
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"-out", tls_dh_params_path,
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"2048"
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])
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else:
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with open(tls_dh_params_path, "w") as dh_params_file:
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dh_params_file.write(
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"2048-bit DH parameters taken from rfc3526\n"
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"-----BEGIN DH PARAMETERS-----\n"
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"MIIBCAKCAQEA///////////JD9qiIWjC"
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"NMTGYouA3BzRKQJOCIpnzHQCC76mOxOb\n"
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"IlFKCHmONATd75UZs806QxswKwpt8l8U"
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"N0/hNW1tUcJF5IW1dmJefsb0TELppjft\n"
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"awv/XLb0Brft7jhr+1qJn6WunyQRfEsf"
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"5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT\n"
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"mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVS"
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"u57VKQdwlpZtZww1Tkq8mATxdGwIyhgh\n"
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"fDKQXkYuNs474553LBgOhgObJ4Oi7Aei"
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"j7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq\n"
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"5RXSJhiY+gUQFXKOWoqsqmj/////////"
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"/wIBAg==\n"
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"-----END DH PARAMETERS-----\n"
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)
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@ -46,8 +46,10 @@ class ServerContextFactory(ContextFactory):
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if not config.no_tls:
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context.use_privatekey(config.tls_private_key)
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context.load_tmp_dh(config.tls_dh_params_path)
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context.set_cipher_list("!ADH:HIGH+kEDH:!AECDH:HIGH+kEECDH")
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# https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
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context.set_cipher_list(
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"ECDH+AESGCM:ECDH+CHACHA20:ECDH+AES256:ECDH+AES128:!aNULL:!SHA1"
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)
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def getContext(self):
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return self._context
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@ -51,7 +51,6 @@ class ConfigGenerationTestCase(unittest.TestCase):
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"lemurs.win.log.config",
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"lemurs.win.signing.key",
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"lemurs.win.tls.crt",
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"lemurs.win.tls.dh",
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"lemurs.win.tls.key",
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]
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),
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