Bug#684340: exim tls fails: Diffie-Hellman prime too short

2013-09-11 Thread Suresh Ramasubramanian
Package: exim4 Version: 4.80-7 Followup-For: Bug #684340 This issue is still around in 4.80-7 on wheezy. Longish thread on postfix-users as well, with an exim developer (Phil Pennock) discussing this bug with Wietse and Viktor Dukhovni. 66_enlarge-dh-parameters-size.dpatch in gnutls is the

Bug#684340: exim tls fails: Diffie-Hellman prime too short

2013-09-11 Thread Florian Weimer
* Suresh Ramasubramanian: Possibly good crypto but extremely bad for interoperability, and obviously ends up in a lot of email being sent out unencrypted / cleartext when at least a base level of TLS should have been available and usable. Setting tls_dh_min_bits=512 in remote_smtp does

Bug#684340: exim tls fails: Diffie-Hellman prime too short

2013-09-11 Thread Suresh Ramasubramanian
On 12-Sep-2013, at 1:18, Florian Weimer f...@deneb.enyo.de wrote: I suppose the simplest mitigation would be to avoid ephemeral Diffie-Hellman key agreement altogether, that is, remove it from the cipher suite default. Dispensing with gnutls and using openssl like most other distros do would

Bug#684340: exim tls fails: Diffie-Hellman prime too short

2013-09-11 Thread Suresh Ramasubramanian
On 12-Sep-2013, at 1:18, Florian Weimer f...@deneb.enyo.de wrote: I suppose the simplest mitigation would be to avoid ephemeral Diffie-Hellman key agreement altogether, that is, remove it from the cipher suite default. By the way this ticket is a dup of #676563 --srs -- To UNSUBSCRIBE,

Bug#684340: exim tls fails: Diffie-Hellman prime too short

2012-08-08 Thread David Lawyer
Package: exim4 Version: 4.80-3 It's reported on the Internet that version 4.77 doesn't have this problem. After updating from v. 4.72, attempts to sent out email to my ISP failed and all messages bounced back to me. After some checking I found out that apparently the option tls_dh_min_bits has