From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Ted Zlatanov Newsgroups: gmane.emacs.bugs Subject: bug#25061: consider adding %COMPAT to default gnutls priority string Date: Mon, 11 Dec 2017 10:03:42 -0500 Organization: =?UTF-8?Q?=D0=A2=D0=B5=D0=BE=D0=B4=D0=BE=D1=80_?= =?UTF-8?Q?=D0=97=D0=BB=D0=B0=D1=82=D0=B0=D0=BD=D0=BE=D0=B2?= @ Cienfuegos Message-ID: <87zi6p71dd.fsf@lifelogs.com> References: <87zikiwpl6.fsf@igalia.com> <878trzo5ys.fsf@lifelogs.com> <87fum7o0qu.fsf@gnu.org> <87zikfmiiy.fsf@lifelogs.com> <878tq0dqgw.fsf@gnus.org> <87sho1gemz.fsf@gnu.org> <87vasigi2c.fsf@igalia.com> <871sv2krfc.fsf@lifelogs.com> <8360d1yzvj.fsf@gnu.org> <877exbhbc5.fsf@lifelogs.com> <87k21bj7sb.fsf@detlef> <87y3phgf3a.fsf@lifelogs.com> <83k210mr8l.fsf@gnu.org> <83374t117z.fsf@gnu.org> <87a7yra2bz.fsf@lifelogs.com> <83o9n7t669.fsf@gnu.org> <87k1xu90eg.fsf@lifelogs.com> <83indeu0xn.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1513004668 30485 195.159.176.226 (11 Dec 2017 15:04:28 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 11 Dec 2017 15:04:28 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: wingo@igalia.com, 25061@debbugs.gnu.org, ludo@gnu.org, michael.albinus@gmx.de, larsi@gnus.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon Dec 11 16:04:16 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eOPcs-0007OK-BG for geb-bug-gnu-emacs@m.gmane.org; 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[76.28.41.155]) by smtp.gmail.com with ESMTPSA id j1sm4235831qkc.5.2017.12.11.07.03.43 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 11 Dec 2017 07:03:45 -0800 (PST) X-Face: bd.DQ~'29fIs`T_%O%C\g%6jW)yi[zuz6; d4V0`@y-~$#3P_Ng{@m+e4o<4P'#(_GJQ%TT= D}[Ep*b!\e,fBZ'j_+#"Ps?s2!4H2-Y"sx" Mail-Copies-To: never In-Reply-To: <83indeu0xn.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 10 Dec 2017 16:12:20 +0200") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 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" Xref: news.gmane.org gmane.emacs.bugs:140926 Archived-At: On Sun, 10 Dec 2017 16:12:20 +0200 Eli Zaretskii wrote: >> From: Ted Zlatanov >> Cc: wingo@igalia.com, 25061@debbugs.gnu.org, ludo@gnu.org, michael.albinus@gmx.de, larsi@gnus.org >> Date: Sun, 10 Dec 2017 08:29:27 -0500 >> >> It would change behavior for everyone for the sake of fixing a few >> setups. Does %DUMBFW or %COMPAT create a risk that's not justified by >> the functionality it provides? These exceptions have a way of living >> long past their expiration date. >> >> If we're confident that's the right thing, then let's change it in the >> release and add a note in the docs. I'm OK with the change; any other >> comments? What should be the actual string? EZ> You mean, should we use %COMPAT or %DUMBFW? I think the latter. But EZ> if no one can reproduce the problem and verify the fix, I think we EZ> should simply describe the problem in PROBLEMS and leave the code EZ> intact. The GnuTLS docs say it "will add a private extension with bogus data that make the client hello exceed 512 bytes. This avoids a black hole behavior in some firewalls. This is the [RFC7685] client hello padding extension, also enabled with %COMPAT." https://gnutls.org/manual/html_node/Priority-Strings.html To me this appears benign and without downsides. Can anyone knowledgeable comment on any possible downsides to this? I'll wait 3 days for objections, then make the change in emacs-26. Thanks Ted