From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.devel Subject: Re: A couple of questions and concerns about Emacs network security Date: Mon, 25 Jun 2018 02:04:11 +0200 Message-ID: References: <83po0iuhs7.fsf@gnu.org> <83lgb4tg92.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1529884982 8426 195.159.176.226 (25 Jun 2018 00:03:02 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 25 Jun 2018 00:03:02 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: Eli Zaretskii , Paul Eggert , Noam Postavsky , emacs-devel@gnu.org To: Jimmy Yuen Ho Wong Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Jun 25 02:02:57 2018 Return-path: Envelope-to: ged-emacs-devel@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 1fXEy7-00023g-9p for ged-emacs-devel@m.gmane.org; Mon, 25 Jun 2018 02:02:55 +0200 Original-Received: from localhost ([::1]:43549 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXF0E-0004NF-Jf for ged-emacs-devel@m.gmane.org; Sun, 24 Jun 2018 20:05:06 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:38684) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXEzX-0004Mi-RK for emacs-devel@gnu.org; Sun, 24 Jun 2018 20:04:25 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fXEzS-0005xh-So for emacs-devel@gnu.org; Sun, 24 Jun 2018 20:04:23 -0400 Original-Received: from hermes.netfonds.no ([80.91.224.195]:51619) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fXEzS-0005w8-LM; Sun, 24 Jun 2018 20:04:18 -0400 Original-Received: from cm-84.212.221.165.getinternet.no ([84.212.221.165] helo=stories) by hermes.netfonds.no with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1fXEzM-0007zr-0M; Mon, 25 Jun 2018 02:04:14 +0200 Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAMFBMVEX76inNyAn980zPyQR/ ADD85A755y2seFz+//uDIjD////97xX+/vf24SLUzy7GwTSzsEWLAAABY0lEQVQ4ja2TsWqEMBjH XZxuCnS5Vzi6iNxQOhUCV6GrU5fuXQvBkr3lZkHyBCcitEsmHyCtfG/Q6bihW1+h/TRRo0Y6tH8z JP78f//PRD3Q+tY6h05eoXUKwzAg4cYsi9wGqB4U/w/yLy2XAz2n1lG+OUGZUJpxB3iIhBBRPQMl 3ZFsTa8d4IqIM3rjKkXTdCg1tFsmKRVNuNlM47B2N27lhxpcrqqqHdIAacBW4hyfi2M3kL8DPyBH Qo7h1pfVSt76sgMr0+7HfVW1w7NLBQsZZCn8QmjNAU0pjsifgrUL3GFHn7pS1nT16lnvYTmGLcFN dINJ+MgxBf3JgNJgN/4NUAcDui8xz/eg9s+qOIhE4Mg68M6SDC/Bpw7GWaNsBhYz/gKwJQzjM/CC dzf9ynYgeFwACa9xAvUIMIWnxAA4MFAwgBKYSNDBFcATqy1gHIqjh9sAdHgTkDcZbVLfVd9u/gOx tWMs38GbfAAAAABJRU5ErkJggg== In-Reply-To: (Jimmy Yuen Ho Wong's message of "Sun, 24 Jun 2018 23:47:26 +0100") X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 80.91.224.195 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:226687 Archived-At: Jimmy Yuen Ho Wong writes: > The sha1-intermediate test still fails on 'medium. Hm! I thought the problem was with SHA1 for intermediate certificates, not root certificates? But this is the certificate chain from https://sha1-intermediate.badssl.com/ ((:version 3 :serial-number "00:be:00:42:69:d7:58:79:57:10:3c:04:e7:aa:4e:d8:b2" :issuer "C=GB,ST=Greater Manchester,L=Salford,O=COMODO CA Limited,CN=COMODO SSL CA" :valid-from "2017-04-13" :valid-to "2020-05-30" :subject "OU=Domain Control Validated,OU=COMODO SSL Wildcard,CN=*.badssl.com" :public-key-algorithm "RSA" :certificate-security-level "Medium" :signature-algorithm "RSA-SHA256") (:version 3 :serial-number "6e:ba:f0:8f:79:83:fa:9d:e1:b2:6f:96:fc:6e:98:bf" :issuer "C=SE,O=AddTrust AB,OU=AddTrust External TTP Network,CN=AddTrust External CA Root" :valid-from "2011-08-23" :valid-to "2020-05-30" :subject "C=GB,ST=Greater Manchester,L=Salford,O=COMODO CA Limited,CN=COMODO SSL CA" :public-key-algorithm "RSA" :certificate-security-level "Medium" :signature-algorithm "RSA-SHA1")) So the SHA1 is in the last certificate there, but it's the intermediary... Here's the one from eternal-september: ((:version 3 :serial-number "03:6f:ea:f0:ef:6e:57:9c:11:94:8c:1d:0e:9e:5a:a5:a7:8d" :issuer "C=US,O=Let's Encrypt,CN=Let's Encrypt Authority X3" :valid-from "2018-05-07" :valid-to "2018-08-05" :subject "CN=news.eternal-september.org" :public-key-algorithm "RSA" :certificate-security-level "Medium" :signature-algorithm "RSA-SHA256") (:version 3 :serial-number "0a:01:41:42:00:00:01:53:85:73:6a:0b:85:ec:a7:08" :issuer "O=Digital Signature Trust Co.,CN=DST Root CA X3" :valid-from "2016-03-17" :valid-to "2021-03-17" :subject "C=US,O=Let's Encrypt,CN=Let's Encrypt Authority X3" :public-key-algorithm "RSA" :certificate-security-level "Medium" :signature-algorithm "RSA-SHA256") (:version 3 :serial-number "44:af:b0:80:d6:a3:27:ba:89:30:39:86:2e:f8:40:6b" :issuer "O=Digital Signature Trust Co.,CN=DST Root CA X3" :valid-from "2000-09-30" :valid-to "2021-09-30" :subject "O=Digital Signature Trust Co.,CN=DST Root CA X3" :public-key-algorithm "RSA" :certificate-security-level "Medium" :signature-algorithm "RSA-SHA1")) The third certificate here also has SHA1... but that's the root certificate? *google* Oh, I see. Some servers include the root certificate (redundantly), and some don't. How do I determine whether a certificate is a root certificate, then? There must be a way... I tried googling but didn't immediately find anything. > Also, shouldn't `network-security-protocol-checks' be a defcustom? Possibly, but editing alists in customize isn't very pleasant. > Lastly, are the dh-small-subgroup and dh-composite tests possible to > check in LISP? I wondered about that, too. I couldn't find anything in the gnutls API, but it's pretty big and I could well have missed something. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no