Re: [LINUX5250] re: tn5250 connect problems

[Scott Klement <klemscot@xxxxxxxxxxxx>]

On Fri, 24 May 2002, Brian McGrogan wrote:

> I can replicate the problem using this (openssl-0.9.6d) :
>
> [root@localhost src]# openssl s_client -connect example.com:50855
> -cipher RC4-MD5 -showcerts
[SNIP]
>
> Yet,  I can establish an SSL connection using this method:
>
> [root@localhost src]# openssl s_client -connect example.com:50855 -ssl3
[SNIP]

Hmmm... the -ssl3 switch works, but -cipher RC4-MD5 doesn't.  The -ssl3
switch causes OpenSSL to force the use of TLSv1 or SSLv3 instead of
auto-negotiating between TLSv1, SSLv3 and SSLv2.  The -cipher switch
changes which encryption/decryption cipher you're using, which isn't quite
the same thing.

Looking at the source for the openssl program (in the apps/s_client.c
source file) I see that -ssl3 uses the SSLv3_client_method() method,
whereas if you don't specify that switch, it defaults to the
SSLv23_client_method()  (which is what we use in TN5250)

If you specify both the -ssl3 switch and the other options, does it work?
That would imply that you need to use the SSLv3_client_method().

If you're building TN5250 from source, you could do a quick test by
editing src/sslstream.c, searching for 'SSLv23_client_method' and
changing it to 'SSLv3_client_method', then recompile and try it out...

If that works, let me know.   I could add a ssl_method config keyword, so
people can set whichever SSL method works best for them...