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Fix federation connections to literal IP addresses

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turns out we need a shiny version of service_identity to enforce this
correctly.
This commit is contained in:
Richard van der Hoff 2019-06-10 15:58:35 +01:00
parent d11c634ced
commit efe7b3176e
2 changed files with 11 additions and 6 deletions
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11
synapse/crypto/context_factory.py
View file

@ -17,7 +17,7 @@ import logging
import idna
from service_identity import VerificationError
from service_identity.pyopenssl import verify_hostname
from service_identity.pyopenssl import verify_hostname, verify_ip_address
from zope.interface import implementer
from OpenSSL import SSL, crypto
@ -156,7 +156,7 @@ class ConnectionVerifier(object):
if isIPAddress(hostname) or isIPv6Address(hostname):
self._hostnameBytes = hostname.encode('ascii')
self._sendSNI = False
self._is_ip_address = True
else:
# twisted's ClientTLSOptions falls back to the stdlib impl here if
# idna is not installed, but points out that lacks support for
@ -164,16 +164,19 @@ class ConnectionVerifier(object):
#
# We can rely on having idna.
self._hostnameBytes = idna.encode(hostname)
self._sendSNI = True
self._is_ip_address = False
self._hostnameASCII = self._hostnameBytes.decode("ascii")
def verify_context_info_cb(self, ssl_connection, where):
if where & SSL.SSL_CB_HANDSHAKE_START and self._sendSNI:
if where & SSL.SSL_CB_HANDSHAKE_START and not self._is_ip_address:
ssl_connection.set_tlsext_host_name(self._hostnameBytes)
if where & SSL.SSL_CB_HANDSHAKE_DONE and self._verify_certs:
try:
if self._is_ip_address:
verify_ip_address(ssl_connection, self._hostnameASCII)
else:
verify_hostname(ssl_connection, self._hostnameASCII)
except VerificationError:
f = Failure()

4
synapse/python_dependencies.py
View file

@ -45,7 +45,9 @@ REQUIREMENTS = [
"signedjson>=1.0.0",
"pynacl>=1.2.1",
"idna>=2",
"service_identity>=16.0.0",
# validating SSL certs for IP addresses requires service_identity 18.1.
"service_identity>=18.1.0",
# our logcontext handling relies on the ability to cancel inlineCallbacks
# (https://twistedmatrix.com/trac/ticket/4632) which landed in Twisted 18.7.