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author | Mark Haines <mjark@negativecurvature.net> | 2016-10-12 15:27:44 +0100 |
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committer | GitHub <noreply@github.com> | 2016-10-12 15:27:44 +0100 |
commit | 9e18e0b1cbcd1297e70a12fc7f3f10ecda42d721 (patch) | |
tree | 9da99efb14d8f896732b275e3c09a63240da931f /synapse | |
parent | Merge pull request #1155 from matrix-org/erikj/pluggable_pwd_auth (diff) | |
parent | Explain how long the servers can cache the TLS fingerprints for (diff) | |
download | synapse-9e18e0b1cbcd1297e70a12fc7f3f10ecda42d721.tar.xz |
Merge pull request #1167 from matrix-org/markjh/fingerprints
Add config option for adding additional TLS fingerprints
Diffstat (limited to '')
-rw-r--r-- | synapse/config/tls.py | 38 | ||||
-rw-r--r-- | synapse/rest/key/v2/local_key_resource.py | 21 |
2 files changed, 46 insertions, 13 deletions
diff --git a/synapse/config/tls.py b/synapse/config/tls.py index fac8550823..3c58d2de17 100644 --- a/synapse/config/tls.py +++ b/synapse/config/tls.py @@ -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): diff --git a/synapse/rest/key/v2/local_key_resource.py b/synapse/rest/key/v2/local_key_resource.py index 93e5b1cbf0..ff95269ba8 100644 --- a/synapse/rest/key/v2/local_key_resource.py +++ b/synapse/rest/key/v2/local_key_resource.py @@ -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( |