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Require ECDH key exchange & remove dh_params (#4429)

* remove dh_params and set better cipher string
This commit is contained in:
Amber Brown 2019-01-22 21:58:50 +11:00 committed by GitHub
parent 83f335bedf
commit 23b0813599
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8 changed files with 6 additions and 57 deletions

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@ -220,7 +220,7 @@ is configured to use TLS with a self-signed certificate. If you would like
to do initial test with a client without having to setup a reverse proxy, to do initial test with a client without having to setup a reverse proxy,
you can temporarly use another certificate. (Note that a self-signed you can temporarly use another certificate. (Note that a self-signed
certificate is fine for `Federation`_). You can do so by changing certificate is fine for `Federation`_). You can do so by changing
``tls_certificate_path``, ``tls_private_key_path`` and ``tls_dh_params_path`` ``tls_certificate_path`` and ``tls_private_key_path``
in ``homeserver.yaml``; alternatively, you can use a reverse-proxy, but be sure in ``homeserver.yaml``; alternatively, you can use a reverse-proxy, but be sure
to read `Using a reverse proxy with Synapse`_ when doing so. to read `Using a reverse proxy with Synapse`_ when doing so.

1
changelog.d/4229.feature Normal file
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@ -0,0 +1 @@
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"
# PEM encoded private key for TLS # PEM encoded private key for TLS
tls_private_key_path: "/etc/matrix-synapse/homeserver.tls.key" tls_private_key_path: "/etc/matrix-synapse/homeserver.tls.key"
# PEM dh parameters for ephemeral keys
tls_dh_params_path: "/etc/matrix-synapse/homeserver.tls.dh"
# Don't bind to the https port # Don't bind to the https port
no_tls: False no_tls: False

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@ -1,9 +0,0 @@
2048-bit DH parameters taken from rfc3526
-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEA///////////JD9qiIWjCNMTGYouA3BzRKQJOCIpnzHQCC76mOxOb
IlFKCHmONATd75UZs806QxswKwpt8l8UN0/hNW1tUcJF5IW1dmJefsb0TELppjft
awv/XLb0Brft7jhr+1qJn6WunyQRfEsf5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT
mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVSu57VKQdwlpZtZww1Tkq8mATxdGwIyhgh
fDKQXkYuNs474553LBgOhgObJ4Oi7Aeij7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq
5RXSJhiY+gUQFXKOWoqsqmj//////////wIBAg==
-----END DH PARAMETERS-----

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@ -4,7 +4,6 @@
tls_certificate_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.crt" tls_certificate_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.crt"
tls_private_key_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.key" tls_private_key_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.key"
tls_dh_params_path: "/data/{{ SYNAPSE_SERVER_NAME }}.tls.dh"
no_tls: {{ "True" if SYNAPSE_NO_TLS else "False" }} no_tls: {{ "True" if SYNAPSE_NO_TLS else "False" }}
tls_fingerprints: [] tls_fingerprints: []

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@ -14,7 +14,6 @@
# limitations under the License. # limitations under the License.
import os import os
import subprocess
from hashlib import sha256 from hashlib import sha256
from unpaddedbase64 import encode_base64 from unpaddedbase64 import encode_base64
@ -23,8 +22,6 @@ from OpenSSL import crypto
from ._base import Config from ._base import Config
GENERATE_DH_PARAMS = False
class TlsConfig(Config): class TlsConfig(Config):
def read_config(self, config): def read_config(self, config):
@ -42,10 +39,6 @@ class TlsConfig(Config):
config.get("tls_private_key_path") config.get("tls_private_key_path")
) )
self.tls_dh_params_path = self.check_file(
config.get("tls_dh_params_path"), "tls_dh_params"
)
self.tls_fingerprints = config["tls_fingerprints"] self.tls_fingerprints = config["tls_fingerprints"]
# Check that our own certificate is included in the list of fingerprints # Check that our own certificate is included in the list of fingerprints
@ -72,7 +65,6 @@ class TlsConfig(Config):
tls_certificate_path = base_key_name + ".tls.crt" tls_certificate_path = base_key_name + ".tls.crt"
tls_private_key_path = base_key_name + ".tls.key" tls_private_key_path = base_key_name + ".tls.key"
tls_dh_params_path = base_key_name + ".tls.dh"
return """\ return """\
# PEM encoded X509 certificate for TLS. # PEM encoded X509 certificate for TLS.
@ -85,9 +77,6 @@ class TlsConfig(Config):
# PEM encoded private key for TLS # PEM encoded private key for TLS
tls_private_key_path: "%(tls_private_key_path)s" tls_private_key_path: "%(tls_private_key_path)s"
# PEM dh parameters for ephemeral keys
tls_dh_params_path: "%(tls_dh_params_path)s"
# Don't bind to the https port # Don't bind to the https port
no_tls: False no_tls: False
@ -131,7 +120,6 @@ class TlsConfig(Config):
def generate_files(self, config): def generate_files(self, config):
tls_certificate_path = config["tls_certificate_path"] tls_certificate_path = config["tls_certificate_path"]
tls_private_key_path = config["tls_private_key_path"] tls_private_key_path = config["tls_private_key_path"]
tls_dh_params_path = config["tls_dh_params_path"]
if not self.path_exists(tls_private_key_path): if not self.path_exists(tls_private_key_path):
with open(tls_private_key_path, "wb") as private_key_file: with open(tls_private_key_path, "wb") as private_key_file:
@ -165,31 +153,3 @@ class TlsConfig(Config):
cert_pem = crypto.dump_certificate(crypto.FILETYPE_PEM, cert) cert_pem = crypto.dump_certificate(crypto.FILETYPE_PEM, cert)
certificate_file.write(cert_pem) certificate_file.write(cert_pem)
if not self.path_exists(tls_dh_params_path):
if GENERATE_DH_PARAMS:
subprocess.check_call([
"openssl", "dhparam",
"-outform", "PEM",
"-out", tls_dh_params_path,
"2048"
])
else:
with open(tls_dh_params_path, "w") as dh_params_file:
dh_params_file.write(
"2048-bit DH parameters taken from rfc3526\n"
"-----BEGIN DH PARAMETERS-----\n"
"MIIBCAKCAQEA///////////JD9qiIWjC"
"NMTGYouA3BzRKQJOCIpnzHQCC76mOxOb\n"
"IlFKCHmONATd75UZs806QxswKwpt8l8U"
"N0/hNW1tUcJF5IW1dmJefsb0TELppjft\n"
"awv/XLb0Brft7jhr+1qJn6WunyQRfEsf"
"5kkoZlHs5Fs9wgB8uKFjvwWY2kg2HFXT\n"
"mmkWP6j9JM9fg2VdI9yjrZYcYvNWIIVS"
"u57VKQdwlpZtZww1Tkq8mATxdGwIyhgh\n"
"fDKQXkYuNs474553LBgOhgObJ4Oi7Aei"
"j7XFXfBvTFLJ3ivL9pVYFxg5lUl86pVq\n"
"5RXSJhiY+gUQFXKOWoqsqmj/////////"
"/wIBAg==\n"
"-----END DH PARAMETERS-----\n"
)

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@ -46,8 +46,10 @@ class ServerContextFactory(ContextFactory):
if not config.no_tls: if not config.no_tls:
context.use_privatekey(config.tls_private_key) context.use_privatekey(config.tls_private_key)
context.load_tmp_dh(config.tls_dh_params_path) # https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
context.set_cipher_list("!ADH:HIGH+kEDH:!AECDH:HIGH+kEECDH") context.set_cipher_list(
"ECDH+AESGCM:ECDH+CHACHA20:ECDH+AES256:ECDH+AES128:!aNULL:!SHA1"
)
def getContext(self): def getContext(self):
return self._context return self._context

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@ -51,7 +51,6 @@ class ConfigGenerationTestCase(unittest.TestCase):
"lemurs.win.log.config", "lemurs.win.log.config",
"lemurs.win.signing.key", "lemurs.win.signing.key",
"lemurs.win.tls.crt", "lemurs.win.tls.crt",
"lemurs.win.tls.dh",
"lemurs.win.tls.key", "lemurs.win.tls.key",
] ]
), ),