From: Daniel Kahn Gillmor Date: Fri, 15 Jan 2016 18:47:51 +0000 (+1900) Subject: Re: [Gaudenz Steinlin] Bug#810784: should match email adress case insensitive when... X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=840469f97b02d2e8cd6b29965df1b8809cfafcdb;p=notmuch-archives.git Re: [Gaudenz Steinlin] Bug#810784: should match email adress case insensitive when sending encrypted mail --- diff --git a/65/ec3c06b5ac09668d82ec86489e6767d41d0d86 b/65/ec3c06b5ac09668d82ec86489e6767d41d0d86 new file mode 100644 index 000000000..ace1719bd --- /dev/null +++ b/65/ec3c06b5ac09668d82ec86489e6767d41d0d86 @@ -0,0 +1,89 @@ +Return-Path: +X-Original-To: notmuch@notmuchmail.org +Delivered-To: notmuch@notmuchmail.org +Received: from localhost (localhost [127.0.0.1]) + by arlo.cworth.org (Postfix) with ESMTP id 41FBD6DE178F + for ; Fri, 15 Jan 2016 10:48:10 -0800 (PST) +X-Virus-Scanned: Debian amavisd-new at cworth.org +X-Spam-Flag: NO +X-Spam-Score: -0.025 +X-Spam-Level: +X-Spam-Status: No, score=-0.025 tagged_above=-999 required=5 + tests=[AWL=-0.025] autolearn=disabled +Received: from arlo.cworth.org ([127.0.0.1]) + by localhost (arlo.cworth.org [127.0.0.1]) (amavisd-new, port 10024) + with ESMTP id W3WXUMWHHHad for ; + Fri, 15 Jan 2016 10:48:08 -0800 (PST) +Received: from che.mayfirst.org (che.mayfirst.org [209.234.253.108]) + by arlo.cworth.org (Postfix) with ESMTP id 3781E6DE0A87 + for ; Fri, 15 Jan 2016 10:48:07 -0800 (PST) +Received: from fifthhorseman.net (unknown [38.109.115.130]) + by che.mayfirst.org (Postfix) with ESMTPSA id A39D0F984; + Fri, 15 Jan 2016 13:47:53 -0500 (EST) +Received: by fifthhorseman.net (Postfix, from userid 1000) + id 065F620024; Fri, 15 Jan 2016 10:47:52 -0800 (PST) +From: Daniel Kahn Gillmor +To: David Bremner , Gaudenz Steinlin , + notmuch@notmuchmail.org, 810784@bugs.debian.org +Subject: Re: [Gaudenz Steinlin] Bug#810784: should match email adress case + insensitive when sending encrypted mail +In-Reply-To: <87egdm4ujh.fsf@tesseract.cs.unb.ca> +References: <87egdm4ujh.fsf@tesseract.cs.unb.ca> +User-Agent: Notmuch/0.21+66~g8c19a9a (http://notmuchmail.org) Emacs/24.5.1 + (x86_64-pc-linux-gnu) +Date: Fri, 15 Jan 2016 13:47:51 -0500 +Message-ID: <874mee7k88.fsf@alice.fifthhorseman.net> +MIME-Version: 1.0 +Content-Type: text/plain +X-BeenThere: notmuch@notmuchmail.org +X-Mailman-Version: 2.1.20 +Precedence: list +List-Id: "Use and development of the notmuch mail system." + +List-Unsubscribe: , + +List-Archive: +List-Post: +List-Help: +List-Subscribe: , + +X-List-Received-Date: Fri, 15 Jan 2016 18:48:10 -0000 + +On Tue 2016-01-12 11:44:18 -0500, David Bremner wrote: +> [gaudenz wrote:] +>> When sending encrypted mail the key lookup to encrypt to is done case +>> sensitive on the mail address. As mail addresses are case insensitive +>> this should be done case insensitive. Otherwise keys for users which for +>> some reason have uppercase letters in their email address in the key UID +>> are not found. + +fwiw, i agree with gaudenz that this is the right thing to do, despite +being a gray area. + +For the right-hand side of an e-mail address (the stuff after the @; the +e-mail domain), the DNS label there is case-insensitive by definition. + +There may be some additional thinking to be done here when thinking +about non-ASCII DNS labels in the RHS, though -- should we be +normalizing the domain names in doing the search? using punycode? + +The stuff before the @ is a bit more problematic. + +According to the standards documents, the left-hand-side of an e-mail +address (the "domain-specific" part) is up to the mail domain to parse +and process. So it would not be a violation of the public +specifications for the operator of the MX for example.org to provide +three distinct mailboxes for alice@example.org and Alice@example.org and +ALICE@example.org. + +However, i know of no mail providers that do so, and anyone proposing to +do such a thing should have their head examined. + +Examining GnuPG's interface here, it looks like gpg already does +case-insensitive matching when searching for an e-mail address +surrounded by angle-brackets. + +So where is the case-insensitive lookup happening? Is this a bug in +mml-mode, or in notmuch-emacs? + + --dkg