Is there any opportunity to set different cipher suits for different versions of TLS?

2013-12-28 Thread Vladimir Belov
Hi, For example, I want to exclude wholly RC4 cipher suits for TLS 1.2/1.1 and leave them only for =TLS 1.0 The reason is the same BEAST. But if we have only one string with cipher suits we can't do this because we need RC4 for TLS 1.0 and lower. --- Regards.

Re: Verisign Problem with smtp tls

2013-12-28 Thread Michael Ströder
Viktor Dukhovni wrote: With SMTP, PKIX certificate verification is pointless without explicit per-destination configuration: http://vdukhovni.github.io/ietf/draft-ietf-dane-smtp-with-dane-05.html#rfc.section.1.2 This is why I am working to implement and standardize SMTP with DANE TLS.

Re: Verisign Problem with smtp tls

2013-12-28 Thread Viktor Dukhovni
On Sat, Dec 28, 2013 at 05:56:41PM +0100, Michael Str?der wrote: http://vdukhovni.github.io/ietf/draft-ietf-dane-smtp-with-dane-05.html#rfc.section.1.2 This is why I am working to implement and standardize SMTP with DANE TLS. DANE itself does not help. It just shifts the trust anchor

Re: Verisign Problem with smtp tls

2013-12-28 Thread Bobber
On 12/27/2013 03:39 PM, Viktor Dukhovni wrote: There's your problem! This server (likely Exchange 2003) has a broken implementation of 3DES CBC padding (search Postfix users archives for my posts on the subject), and your cipher list is either long enough to cause it to not see RC4-SHA and

Re: Verisign Problem with smtp tls

2013-12-28 Thread Daode
|SMTP TLS, but I am not obligated to provide a comprehensive |justification in response to every trollish one liner, the above Luckily there is the UDPish EDNS0 extension from RFC 2671 as in The default is 1280 (RFC 2671, 4.5.1.). The minimum is 1024 (RFC 3226, 3.; note: not 1220!). The

Re: Verisign Problem with smtp tls

2013-12-28 Thread Viktor Dukhovni
On Sat, Dec 28, 2013 at 12:23:21PM -0600, Bobber wrote: Thanks very much for your help Viktor. I was able to specify the RC4-MD5 cipher and it works. I am using Qmail with the John Simpson patch set by the way. There is a control file (tlsclientcipher) which John had not documented but

Re: Verisign Problem with smtp tls

2013-12-28 Thread Bobber
On 12/28/2013 12:51 PM, Viktor Dukhovni wrote: Does this modify the ciphers used for all connections, or just for the server in question? All connections. Any suggestions for what ciphers to put in the list besides RC4-MD5? If you read my previous responses on this thread, you'll notice I

Re: Verisign Problem with smtp tls

2013-12-28 Thread Viktor Dukhovni
On Sat, Dec 28, 2013 at 12:58:58PM -0600, Bobber wrote: Does this modify the ciphers used for all connections, or just for the server in question? All connections. In that case I would go for the second cipherlist, though still compact, it is a superset of the first and will interoperate