[openssl-users] Call for testing TLS 1.3

Dennis Clarke dclarke at blastwave.org
Mon Apr 30 02:05:39 UTC 2018

On 29/04/18 06:43 AM, Kurt Roeckx wrote:
> The upcomming OpenSSL 1.1.1 release will have TLS 1.3 support. TLS
> 1.3 brings a lot of changes that might cause incompatibility. For
> an overview see https://wiki.openssl.org/index.php/TLS1.3

Looking at https://wiki.openssl.org/index.php/TLS1.3#Ciphersuites
there are five pure TLSv1.3 ciphersuites listed. At the moment the
OpenSSL 1.1.1-pre5 utters :

n0$ LD_LIBRARY_PATH=`pwd` apps/openssl ciphers -v | grep " TLSv1\.3 "
TLS_AES_256_GCM_SHA384  TLSv1.3 Kx=any      Au=any  Enc=AESGCM(256) Mac=AEAD
TLS_CHACHA20_POLY1305_SHA256 TLSv1.3 Kx=any      Au=any 
Enc=CHACHA20/POLY1305(256) Mac=AEAD
TLS_AES_128_GCM_SHA256  TLSv1.3 Kx=any      Au=any  Enc=AESGCM(128) Mac=AEAD

So using a client connect test to apache means build up a separate
instance ( and toolchain perhaps ) running with pre4 beta only and a
self cert and then ... isolate to only TLS_AES_256_GCM_SHA384 ( for
example ) in the apache ssl config. This will take some days just for
an initial test framework and then try :

n0$ LD_LIBRARY_PATH=`pwd` apps/openssl s_client -connect 
www.tls13.net:443 -tls1_3
4294967296:error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert 
handshake failure:ssl/record/rec_layer_s3.c:1569:SSL alert number 40
no peer certificate available
No client certificate CA names sent
SSL handshake has read 7 bytes and written 239 bytes
Verification: OK
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
     Protocol  : TLSv1.3
     Cipher    : 0000
     PSK identity: None
     PSK identity hint: None
     SRP username: None
     Start Time: 1525051962
     Timeout   : 7200 (sec)
     Verify return code: 0 (ok)
     Extended master secret: no

This should be fun to test.

> https://github.com/tlswg/tls13-spec/wiki/Implementations lists
> other TLS 1.3 implementations and the draft they currently
> support. Note that the versions listed there might not be for the
> latest release. It also lists some https test servers.

I'll take a look.


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