On 29/01/2010 11:22 AM, Timo Sirainen wrote:
On Thu, 2010-01-28 at 15:23 -0800, Patrick Horgan wrote:
Just a bump, still have the problem, why would dovecot support sslv2 for
pop, but not for imap, when it's configured to not support sslv2 at all?
I don't know why your nmap run would have shown only one of them
supporting SSLv2, it should have shown both. And that's because I
initialize OpenSSL with:
ctx->ctx = ssl_ctx = SSL_CTX_new(SSLv23_server_method());
So I guess what happens is that OpenSSL advertises that it supports
SSLv2. But then the ssl_cipher_list's !SSLv2 doesn't let the SSLv2
handshake actually go through. So it's not really possible to use SSLv2.
You can verify this with:
openssl s_client -ssl2 -connect localhost:995
Anyway.. I guess I should do something about this. Not really sure what,
though.
Apache mod_ssl has both a SSLCipherSuite and SSLProtocol option.
SSLCipherSuite takes the same syntax as Dovecot's ssl_cipher_list.
Dovecot doesn't have an equivalent of SSLProtocol.
in Apache:
SSLCipherSuite
ALL:!aNULL:!ADH:!eNULL:!LOW:!EXP:!SSLv2:RC4+RSA:-MD5:+HIGH:+MEDIUM:@STRENGTH
|SSLProtocol all -SSLv2|
I'm not that fussed, but it would be good to be able to disable for
completeness. (I'm more fussed by MSIE6 preventing me from defaulting to
stronger ciphers for web servers - and defaulting to SSLv2 enabled, but
TLS disabled).
Rob Middleton.
