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Merge pull request #1167 from matrix-org/markjh/fingerprints

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Add config option for adding additional TLS fingerprints
This commit is contained in:
Mark Haines 2016-10-12 15:27:44 +01:00 committed by GitHub
commit 9e18e0b1cb
2 changed files with 46 additions and 13 deletions
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38
synapse/config/tls.py
View File

@ -19,6 +19,9 @@ from OpenSSL import crypto
import subprocess
import os
from hashlib import sha256
from unpaddedbase64 import encode_base64
GENERATE_DH_PARAMS = False
@ -42,6 +45,19 @@ class TlsConfig(Config):
config.get("tls_dh_params_path"), "tls_dh_params"
)
self.tls_fingerprints = config["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})
# This config option applies to non-federation HTTP clients
# (e.g. for talking to recaptcha, identity servers, and such)
# It should never be used in production, and is intended for
@ -73,6 +89,28 @@ class TlsConfig(Config):
# Don't bind to the https port
no_tls: False
# 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
# certificates returned by this server match one of the fingerprints.
#
# Synapse automatically adds its the fingerprint of its own certificate
# to the list. So if federation traffic is handle directly by synapse
# then no modification to the list is required.
#
# If synapse is run behind a load balancer that handles the TLS then it
# will be necessary to add the fingerprints of the certificates used by
# the loadbalancers to this list if they are different to the one
# synapse is using.
#
# Homeservers are permitted to cache the list of TLS fingerprints
# returned in the key responses up to the "valid_until_ts" returned in
# key. It may be necessary to publish the fingerprints of a new
# certificate and wait until the "valid_until_ts" of the previous key
# responses have passed before deploying it.
tls_fingerprints: []
# tls_fingerprints: [{"sha256": "<base64_encoded_sha256_fingerprint>"}]
""" % locals()
def read_tls_certificate(self, cert_path):

21
synapse/rest/key/v2/local_key_resource.py
View File

@ -19,8 +19,6 @@ from synapse.http.server import respond_with_json_bytes
from signedjson.sign import sign_json
from unpaddedbase64 import encode_base64
from canonicaljson import encode_canonical_json
from hashlib import sha256
from OpenSSL import crypto
import logging
@ -48,8 +46,12 @@ class LocalKey(Resource):
"expired_ts": # integer posix timestamp when the key expired.
"key": # base64 encoded NACL verification key.
}
}
"tls_certificate": # base64 ASN.1 DER encoded X.509 tls cert.
},
"tls_fingerprints": [ # Fingerprints of the TLS certs this server uses.
{
"sha256": # base64 encoded sha256 fingerprint of the X509 cert
},
],
"signatures": {
"this.server.example.com": {
"algorithm:version": # NACL signature for this server
@ -90,21 +92,14 @@ class LocalKey(Resource):
u"expired_ts": key.expired,
}
x509_certificate_bytes = crypto.dump_certificate(
crypto.FILETYPE_ASN1,
self.config.tls_certificate
)
sha256_fingerprint = sha256(x509_certificate_bytes).digest()
tls_fingerprints = self.config.tls_fingerprints
json_object = {
u"valid_until_ts": self.valid_until_ts,
u"server_name": self.config.server_name,
u"verify_keys": verify_keys,
u"old_verify_keys": old_verify_keys,
u"tls_fingerprints": [{
u"sha256": encode_base64(sha256_fingerprint),
}]
u"tls_fingerprints": tls_fingerprints,
}
for key in self.config.signing_key:
json_object = sign_json(