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.