From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Lawrence Mitchell Newsgroups: gmane.emacs.bugs Subject: bug#9036: [PATCH] gnutls: Add option to set minimum acceptable Diffie-Hellman key size Date: Thu, 10 Nov 2011 15:21:54 +0000 Message-ID: <87ty6c6m0d.fsf@gmx.li> References: <87ei1zpl0x.fsf@ed.ac.uk> <87zkkefrl9.fsf@gmx.li> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1320938589 31857 80.91.229.12 (10 Nov 2011 15:23:09 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Thu, 10 Nov 2011 15:23:09 +0000 (UTC) To: 9036@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Nov 10 16:23:05 2011 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([140.186.70.17]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ROWT2-0002R3-Hw for geb-bug-gnu-emacs@m.gmane.org; Thu, 10 Nov 2011 16:23:04 +0100 Original-Received: from localhost ([::1]:36994 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ROWT1-0008WO-VA for geb-bug-gnu-emacs@m.gmane.org; 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Thu, 10 Nov 2011 10:22:15 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ROWSA-0003eY-D2 for bug-gnu-emacs@gnu.org; Thu, 10 Nov 2011 10:22:11 -0500 Original-Received: from lo.gmane.org ([80.91.229.12]:43132) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ROWSA-0003eG-7p for bug-gnu-emacs@gnu.org; Thu, 10 Nov 2011 10:22:10 -0500 Original-Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1ROWS7-0001tY-Jv for bug-gnu-emacs@gnu.org; Thu, 10 Nov 2011 16:22:07 +0100 Original-Received: from e4300lm.epcc.ed.ac.uk ([129.215.63.156]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 10 Nov 2011 16:22:07 +0100 Original-Received: from wence by e4300lm.epcc.ed.ac.uk with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 10 Nov 2011 16:22:07 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 30 Original-X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: e4300lm.epcc.ed.ac.uk User-Agent: Gnus/5.110018 (No Gnus v0.18) Emacs/24.0.91 (gnu/linux) Cancel-Lock: sha1:VgQLNtUEKFRG7x75bD5/ICXm0L0= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list Resent-Date: Thu, 10 Nov 2011 10:23:02 -0500 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:53787 Archived-At: Lars Magne Ingebrigtsen wrote: > Lawrence Mitchell writes: >> The handshake returns GNUTLS_E_DH_PRIME_UNACCEPTABLE if the >> number of server prime bits is too low. I don't know how to >> query the size of the server prime. Maybe >> gnutls_dh_get_prime_bits? I'm wary to automatically adjust >> downwards. > I think adjusting it downwards automatically until you reach a > (user-definable) absolute lower limit would be fine. But I have no idea > what an acceptable default lower limit would be, or what the impact on > security this would have. >> A better error message (pointing at the existance of >> gnutls-min-prime-bits) in the case of this failure mode would >> probably be good though. I'll try and cook up a patch in the >> next few days. > Great! So it turns out this wasn't a few days. And I couldn't figure out a nice way to fix things up properly. So no patch sorry :(. However, I think the original bug can be closed, because there is now an option to set the DH key size. Lawrence -- Lawrence Mitchell