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Date:	Tue, 08 Jan 2013 22:05:01 +0100
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Subject:	Re: Problem with HTTPS in LWP module in Perl - solution
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FYI,

I ran into the same problem, did some wiresharking, and  figured out 
what the differences are
between a successful handshake (Firefox) and the failure (LWP using 
SSLeay/openssl).
I'm not too familiar with SSL/TLS etc, but it turns out that the cipher 
list is way larger using
openssl (64 suites) than with Firefox (36 suites). I figure the order 
and presence of some ciphers
is the cause: the actual cipher used is TLS_RSA_WITH_RC4_128_SHA, which 
is present in both
cases. Also the TLS version used (1.0 for Firefox, 1.2 for openssl) does 
not make a difference.

The following code allows for a successful transaction with 
https://www.geocaching.com.
The solution is in the SSL_cipher_list:

$ perl -e '$ENV{PERL_NET_HTTPS_SSL_SOCKET_CLASS}="IO::Socket::SSL";\
use IO::Socket::SSL; IO::Socket::SSL::set_defaults(SSL_cipher_list => 
"RC4-SHA");\
use LWP::UserAgent; print LWP::UserAgent->new()->request(\
HTTP::Request->new(GET=>"https://www.geocaching.com"))->content;'

However this includes only the one cipher (and 
TLS_EMPTY_RENEGOTIATION_INFO_SCSV).

Expanding to all SHA ciphers, the following filter must be used:
           'SHA:!NULL:!3DES:!DES:!ADH:!SRP'

Finally, this is the filter with a relatively broad scope, and again all 
exclusions are required:

          'ALL:!3DES:!DES:!ADH:!SRP:!AESGCM:!SHA256:!SHA384'

When any of these excluded ciphers/hashes are present in the Client 
Hello negotiation packet,
there is no response from the server besides a TCP ACK.
Note that, for instance, '!3DES' also filters out ciphers that use 3DES 
as an encoding (I guess)
and not as the main cipher, such as TLS_RSA_WITH_3DES_EDE_CBC_SHA, who's 
presence in the handshake is not problematic.

I figure that servers that do not respond at the TLS/SSL level when they 
see a client offering certain capabilities have their reasons for doing 
so, for a 'rep scasw' can't be that buggy.

Yours sincerely,
   Kenney Westerhof


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