From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Tomas Nordin Newsgroups: gmane.emacs.help,gmane.emacs.w3m Subject: Re: [emacs-w3m:13607] Re: Browser Fingerprinting Date: Sat, 18 Apr 2020 12:12:44 +0200 Message-ID: <87blnpnlur.fsf@fliptop.i-did-not-set--mail-host-address--so-tickle-me> References: <87lfmx8frv.fsf@ebih.ebihd> <873694mu9f.fsf@fliptop.i-did-not-set--mail-host-address--so-tickle-me> <20200417025514.5gotmp6vlvg3v25x@E15-2016.optimum.net> <87h7xio7dw.fsf@fliptop.i-did-not-set--mail-host-address--so-tickle-me> <20200417085716.vbfkk5ibchc74ev5@E15-2016.optimum.net> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="101183"; mail-complaints-to="usenet@ciao.gmane.io" Cc: help-gnu-emacs@gnu.org, emacs-w3m@namazu.org, Emanuel Berg To: Boruch Baum Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Apr 18 12:13:30 2020 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jPkTZ-000QDl-Un for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 18 Apr 2020 12:13:29 +0200 Original-Received: from localhost ([::1]:56462 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jPkTZ-0007gL-0c for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 18 Apr 2020 06:13:29 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:39660) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jPkSx-0007ft-Ne for help-gnu-emacs@gnu.org; Sat, 18 Apr 2020 06:12:53 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jPkSw-0005MA-4F for help-gnu-emacs@gnu.org; Sat, 18 Apr 2020 06:12:51 -0400 Original-Received: from mout01.posteo.de ([185.67.36.65]:48894) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jPkSv-0005FY-D8 for help-gnu-emacs@gnu.org; Sat, 18 Apr 2020 06:12:49 -0400 Original-Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id 24279160061 for ; Sat, 18 Apr 2020 12:12:45 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1587204766; bh=4OjPVAfBhINkT39mosQPXyMnTjB0+65g32h+JOeEK04=; h=From:To:Cc:Subject:Date:From; b=KyqGbSmcEQn4U+s5nM/r+Kam7xJr1TF4br7uKVSwr/8zGKYCc4GrG59RSDL1dv3Cd onulkWIb7SjC+NooYxBQWxNqN7GYdQEDgbldH4ANCDbS9malx8P07W0o9XXyjyN8gN 6xZS+2UQ5Y0OT/Juzd22sxmhDi+OIyAOeaaywroZfB0ZE1mXIjqZLrdb+lpzAVHDy3 fYOGRs2DThUBdxjaFBwKNHEeTcLG35Lbkb8BUMxLUwrB0vPCzJQjJKtX9c2w2H4X6s iK4hVkCH00StlTSC/iU6EN0RYcsUw64ucASEr6ysyZ562lr31hm1maeLsVBBQOMX0O M5a+O79RIKjCg== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 49480Y05WFz6tmQ; Sat, 18 Apr 2020 12:12:44 +0200 (CEST) In-Reply-To: <20200417085716.vbfkk5ibchc74ev5@E15-2016.optimum.net> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 185.67.36.65 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:122881 gmane.emacs.w3m:10496 Archived-At: Boruch Baum writes: > On 2020-04-17 10:15, Tomas Nordin wrote: >> The fields tested as browser characteristtics were >> ... > > Thanks. Good to know. > >> The most identifying characteristics is User Agent followed by >> HTTP_ACCEPT Headers. > > Of course emacs-w3m and w3m have no choice but to send them, but ... > > >> Browsing the web with a text based browser is not a common thing to do, >> so from a browser fingerprinting point of view I guess the uniqeness is >> to be expected. > > Right. That's why I suggested in my original e-mail... > > > "What might be more useful is to set variable w3m-add-user-agent to t, > and then set w3m-user-agent to some generic and popular user-agent > string." > > That leaves us with the matter of the HTTP_ACCEPT Headers. My memory is > that the information sent in that header is very limited, just a set of > mime-types that the server can use to send data to the client. That > doesn't seem to me to be much from which to create a fingerprint, but it > would be great to do a comparison. emacs-w3m does have configurable Different browsers (mis)use this header string differently [1]. The string lists mime types in a certain order with some optional ratings for each. If an un-common browser has this string different from common browsers it adds uniqueness. [1] https://www.newmediacampaigns.com/blog/browser-rest-http-accept-headers