> s->cert->sec_cb() and then call it with SSL_SECOP_VERSION operation
with nbits set to TLS1.1 version? then it will return and tell us if it
is acceptable or not, by the security level.
Nice!
Could you hook up the check to SSL_CTX_set_min_proto_version() and return an
error code when level and security policy don't match? It's a modern setter, so
it can return 0 on error.
int SSL_CTX_set_min_proto_version(SSL_CTX *ctx, int version);
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https://bugs.launchpad.net/bugs/1917625
Title:
OpenSSL TLS 1.1 handshake fails internal error
Status in openssl package in Ubuntu:
Confirmed
Status in openssl source package in Hirsute:
Confirmed
Bug description:
OpenSSL's SSL_do_handshake() method fails with
TLSV1_ALERT_INTERNAL_ERROR when client side has TLS 1.0 to 1.2 enabled
but server side has only TLS 1.0 and 1.1 enabled. The issue breaks
Python's test suite for test_ssl. It looks like the problem is caused
by an Ubuntu downstream patch. Vanilla OpenSSL, Debian, and Fedora are
not affected.
A simple reproducer is:
import ssl
import socket
from test.test_ssl import testing_context, ThreadedEchoServer, HOST
client_context, server_context, hostname = testing_context()
# client 1.0 to 1.2, server 1.0 to 1.1
client_context.minimum_version = ssl.TLSVersion.TLSv1
client_context.maximum_version = ssl.TLSVersion.TLSv1_2
server_context.minimum_version = ssl.TLSVersion.TLSv1
server_context.maximum_version = ssl.TLSVersion.TLSv1_1
with ThreadedEchoServer(context=server_context) as server:
with client_context.wrap_socket(socket.socket(),
server_hostname=hostname) as s:
s.connect((HOST, server.port))
assert s.version() == 'TLSv1.1'
On Ubuntu 20.04 the code fails with:
Traceback (most recent call last):
File "/internalerror.py", line 15, in <module>
s.connect((HOST, server.port))
File "/usr/lib/python3.8/ssl.py", line 1342, in connect
self._real_connect(addr, False)
File "/usr/lib/python3.8/ssl.py", line 1333, in _real_connect
self.do_handshake()
File "/usr/lib/python3.8/ssl.py", line 1309, in do_handshake
self._sslobj.do_handshake()
ssl.SSLError: [SSL: TLSV1_ALERT_INTERNAL_ERROR] tlsv1 alert internal error
(_ssl.c:1123)
On Debian testing and Fedora 33 the same test passes with out:
server: new connection from ('127.0.0.1', 52346)
server: connection cipher is now ('ECDHE-RSA-AES256-SHA', 'TLSv1.0', 256)
server: selected protocol is now None
You can find Dockerfiles with reproducers at https://github.com/tiran
/distro-truststore/tree/main/tests/ubuntu-1899878
Also see:
* https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1899878
* https://bugs.python.org/issue43382
* https://bugs.python.org/issue41561
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1917625/+subscriptions
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