Re: Disabling Anonymous Diffie Hellman

2014-05-20 Thread Colin Fowler
ginal config. thanks again, Colin On 20-05-2014 14:25, Viktor Dukhovni wrote: On Tue, May 20, 2014 at 02:11:34PM +0100, Colin Fowler wrote: >Opportunistic TLS is sometimes counter-intuitive, attempting to >make it stronger by removing weaker features actually makes it >

Re: Disabling Anonymous Diffie Hellman

2014-05-20 Thread Colin Fowler
Thank you Viktor for your reply! On 20-05-2014 13:44, Viktor Dukhovni wrote: On Tue, May 20, 2014 at 02:25:49PM +0200, Thomas Leuxner wrote: In any case you miserably failed to elaborate how to mitigate the issue other than stating 'revert the change'. Without defending the tone of that advi

Re: Disabling Anonymous Diffie Hellman

2014-05-20 Thread Colin Fowler
On 20-05-2014 12:16, li...@rhsoft.net wrote: Am 20.05.2014 13:03, schrieb Colin Fowler: ADH is susceptible to MITM attacks, but I can't seem to turn it off. I've tried various permutations of tls_preempt_cipherlist = yes tls_high_cipherlist (with !DH and !ADH) smtpd_tls_mandatory

Disabling Anonymous Diffie Hellman

2014-05-20 Thread Colin Fowler
ADH is susceptible to MITM attacks, but I can't seem to turn it off. I've tried various permutations of tls_preempt_cipherlist = yes tls_high_cipherlist (with !DH and !ADH) smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3 smtpd_tls_mandatory_ciphers = high I'm running 2.9.6 on Debian Wheezy. An