Package: emacs;
Reported by: David Bremner <david <at> tethera.net>
Date: Sat, 20 Sep 2014 06:14:01 UTC
Severity: normal
Found in version 24.3
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
Bug is archived. No further changes may be made.
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bug-gnu-emacs <at> gnu.org
:bug#18513
; Package emacs
.
(Sat, 20 Sep 2014 06:14:02 GMT) Full text and rfc822 format available.David Bremner <david <at> tethera.net>
:bug-gnu-emacs <at> gnu.org
.
(Sat, 20 Sep 2014 06:14:02 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: David Bremner <david <at> tethera.net> To: bug-gnu-emacs <at> gnu.org Subject: 24.3; message-mode sends unencrypted on error Date: Sat, 20 Sep 2014 08:12:26 +0200
1) Start emacs with emacs -Q 2) start sending a message with M-x message-mail 3) add "sign" tag with C-c C-m C-s 3) manually replace "sign with "sigencrypt", simulating failed attempt to manually change mode 4) add some text to the message, set a destination address and subject 5) send using C-c C-c The message is sent unencrypted, without any feedback to the user. It seems that the correct response would be to refuse to send a message with malformed mml tags. In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars) of 2014-06-06 on barber, modified by Debian Windowing system distributor `The X.Org Foundation', version 11.0.11600000 System Description: Debian GNU/Linux testing (jessie) Configured using: `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp' '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes' '--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' '--without-gconf' '--without-gsettings' 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall' 'LDFLAGS=-Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'' Important settings: value of $LANG: en_CA.UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Circe Channel Minor modes in effect: tracking-mode: t diff-auto-refine-mode: t shell-dirtrack-mode: t tooltip-mode: t mouse-wheel-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Recent input: d @ t h <backspace> e t h e r a <tab> <return> C-n t e s t i n g SPC e n c r y p t i o n SPC f a i l 2 C-n C-n C-n C-c RET C-e C-p C-r C-e M-b M-d n s a C-n <return> E d w a r d S-SPC S n o w d e n . SPC S e k r i t SPC s t u f f . C-c C-c q = <up> <return> C-c C-SPC y e a h , SPC I ' ; d <backspace> <backspace> d SPC n e e d SPC t o SPC u s e SPC a SPC w e b SPC b r o w s e r SPC f o r SPC t h a t . SPC <return> s <backspace> s t i l l SPC n o t SPC s t a l l m a n SPC <backspace> e s q u e SPC e n o u g h <return> b t w , SPC c <backspace> h o w SPC c a n SPC I SPC f i n d SPC a l l SPC b u g s SPC i n SPC m e s s a g e - m o d e SPC o n SPC b u g s . g n u . o r g SPC ? <return> e r r . SPC d e b b u g s . g n u . o r g <return> / m e SPC l o o k s SPC f o r SPC h i s SPC b u g g y w h i p <return> <help-echo> M-x r e p o r <tab> <return> Recent messages: Sending via mail... Sending...done Invalid face reference: message-header-from [33 times] Making completion list... View mode: type C-h for help, h for commands, q to quit. Mark set [3 times] Sending... Mark set [2 times] Sending via mail... 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/usr/share/emacs24/site-lisp/auctex/bib-cite hides /usr/share/emacs/site-lisp/auctex/bib-cite /usr/share/emacs24/site-lisp/auctex/tex-jp hides /usr/share/emacs/site-lisp/auctex/tex-jp /usr/share/emacs24/site-lisp/auctex/tex-font hides /usr/share/emacs/site-lisp/auctex/tex-font /usr/share/emacs24/site-lisp/auctex/context-en hides /usr/share/emacs/site-lisp/auctex/context-en /usr/share/emacs24/site-lisp/auctex/tex-info hides /usr/share/emacs/site-lisp/auctex/tex-info /usr/share/emacs/24.3/lisp/emacs-lisp/cl-lib hides /usr/share/emacs/24.3/site-lisp/slime/lib/cl-lib /usr/share/emacs/24.3/lisp/emacs-lisp/ert hides /usr/share/emacs/24.3/site-lisp/slime/lib/ert /usr/share/emacs/24.3/lisp/emacs-lisp/ert-x hides /usr/share/emacs/24.3/site-lisp/slime/lib/ert-x Features: (shadow emacsbug sh-script smie time shr-color color shr gnus-art mm-uu mml2015 epg-config gnus-sum nnoo gnus-group gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range gnus-win gnus gnus-ems nnheader view 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org-loaddefs find-func remember rx vc vc-dispatcher notmuch hl-line notmuch-version notmuch-message notmuch-maildir-fcc notmuch-hello wid-edit notmuch-tree notmuch-parser notmuch-show notmuch-print notmuch-crypto notmuch-mua notmuch-address notmuch-wash diff-mode coolj notmuch-query goto-addr icalendar diary-lib diary-loaddefs cal-menu calendar cal-loaddefs notmuch-tag crm notmuch-lib message sendmail rfc822 mml mailabbrev mail-utils gmm-utils mailheader mm-view mml-smime mml-sec smime password-cache dig mm-decode mm-bodies mm-encode mailcap mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mm-util mail-prsvr debian-el debian-el-loaddefs w3m-load slime-autoloads cl-macs gv pylint org-install 50magit haskell-mode-autoloads edmacro kmacro geiser-install geiser ido ess-toolbar ess-mouse mouseme thingatpt browse-url ess-menu ess-swv ess-noweb ess-noweb-font-lock-mode ess-bugs-l essd-els ess-sas-d ess-sas-l ess-sas-a shell pcomplete ess-sta-d ess-sta-l cc-vars cc-defs make-regexp ess-sp6-d ess-sp3-d ess-julia ess-r-d compile ess-tracebug format-spec ess-roxy advice cl cl-lib advice-preload hideshow ess-help ess-developer ess-r-args eldoc help-fns ess-s-l ess ess-inf comint ansi-color ring ess-mode ess-noweb-mode ess-utils time-date ess-custom executable easymenu ess-compat ess-site emacs-goodies-el emacs-goodies-custom emacs-goodies-loaddefs easy-mmode dpkg-dev-el dpkg-dev-el-loaddefs preview-latex tex-site auto-loads tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process dbusbind dynamic-setting font-render-setting x-toolkit x multi-tty emacs)
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(Mon, 29 Sep 2014 11:11:02 GMT) Full text and rfc822 format available.Message #8 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Daiki Ueno <ueno <at> gnu.org> To: David Bremner <david <at> tethera.net> Cc: 18513 <at> debbugs.gnu.org Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Mon, 29 Sep 2014 20:09:53 +0900
[Message part 1 (text/plain, inline)]
David Bremner <david <at> tethera.net> writes: > 1) Start emacs with emacs -Q > 2) start sending a message with M-x message-mail > 3) add "sign" tag with C-c C-m C-s > 3) manually replace "sign with "sigencrypt", simulating failed attempt to > manually change mode > 4) add some text to the message, set a destination address and > subject > 5) send using C-c C-c > > The message is sent unencrypted, without any feedback to the user. It > seems that the correct response would be to refuse to send a message > with malformed mml tags. I've installed the following simple fix in the trunk. Does it work for you?
[mml.el.diff (text/x-diff, inline)]
=== modified file 'lisp/gnus/ChangeLog' --- lisp/gnus/ChangeLog 2014-09-11 19:44:25 +0000 +++ lisp/gnus/ChangeLog 2014-09-29 11:02:32 +0000 @@ -1,3 +1,8 @@ +2014-09-29 Daiki Ueno <ueno <at> gnu.org> + + * mml.el (mml-parse-1): Error out if unknown mode is specified in + <#secure> tag (bug#18513). + 2014-09-11 Paul Eggert <eggert <at> cs.ucla.edu> * gnus-cloud.el (gnus-cloud-parse-version-1): Fix misspelling === modified file 'lisp/gnus/mml.el' --- lisp/gnus/mml.el 2014-03-24 01:56:03 +0000 +++ lisp/gnus/mml.el 2014-09-29 11:00:11 +0000 @@ -257,7 +257,9 @@ ((string= mode "encrypt") (setq tags (list "encrypt" method))) ((string= mode "signencrypt") - (setq tags (list "sign" method "encrypt" method)))) + (setq tags (list "sign" method "encrypt" method))) + (t + (error "Unknown secure mode %s" mode))) (eval `(mml-insert-tag ,secure-mode ,@tags ,(if keyfile "keyfile")
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(Mon, 29 Sep 2014 12:15:01 GMT) Full text and rfc822 format available.Message #11 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: David Bremner <david <at> tethera.net> To: Daiki Ueno <ueno <at> gnu.org> Cc: 18513 <at> debbugs.gnu.org Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Mon, 29 Sep 2014 14:14:00 +0200
Daiki Ueno <ueno <at> gnu.org> writes: > I've installed the following simple fix in the trunk. Does it work for you? > === modified file 'lisp/gnus/mml.el' > --- lisp/gnus/mml.el 2014-03-24 01:56:03 +0000 > +++ lisp/gnus/mml.el 2014-09-29 11:00:11 +0000 > @@ -257,7 +257,9 @@ > ((string= mode "encrypt") > (setq tags (list "encrypt" method))) > ((string= mode "signencrypt") > - (setq tags (list "sign" method "encrypt" method)))) > + (setq tags (list "sign" method "encrypt" method))) > + (t > + (error "Unknown secure mode %s" mode))) > (eval `(mml-insert-tag ,secure-mode > ,@tags > ,(if keyfile "keyfile") It's definitely an improvement, and it fixes the scenario I reported. On the other hand, if the use corrupts the #secure tag then essentially the same behaviour results. Would it be possible to have a strict mode where any unknown mml tag causes an error? David
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(Tue, 30 Sep 2014 01:37:02 GMT) Full text and rfc822 format available.Message #14 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Daiki Ueno <ueno <at> gnu.org> To: David Bremner <david <at> tethera.net> Cc: 18513 <at> debbugs.gnu.org Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Tue, 30 Sep 2014 10:36:13 +0900
David Bremner <david <at> tethera.net> writes: > It's definitely an improvement, and it fixes the scenario I reported. On > the other hand, if the use corrupts the #secure tag then essentially the > same behaviour results. Would it be possible to have a strict mode where > any unknown mml tag causes an error? Could be, but I guess it should be a separate issue (and a wishlist rather than important). For the meantime, I think a reasonable solution would be to add (more?) checks for the #secure tag only.
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(Wed, 01 Oct 2014 01:29:01 GMT) Full text and rfc822 format available.Message #17 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Glenn Morris <rgm <at> gnu.org> To: Daiki Ueno <ueno <at> gnu.org> Cc: David Bremner <david <at> tethera.net>, 18513 <at> debbugs.gnu.org Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Tue, 30 Sep 2014 21:28:38 -0400
Daiki Ueno wrote: > I've installed the following simple fix in the trunk. Does it work for you? [...] > - (setq tags (list "sign" method "encrypt" method)))) > + (setq tags (list "sign" method "encrypt" method))) > + (t > + (error "Unknown secure mode %s" mode))) Seems like a safe, simple fix for a potentially important issue; so what do you think about putting it in emacs-24?
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(Wed, 01 Oct 2014 02:33:01 GMT) Full text and rfc822 format available.Message #20 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Daiki Ueno <ueno <at> gnu.org> To: Glenn Morris <rgm <at> gnu.org> Cc: David Bremner <david <at> tethera.net>, 18513 <at> debbugs.gnu.org Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Wed, 01 Oct 2014 11:32:34 +0900
Glenn Morris <rgm <at> gnu.org> writes: > Daiki Ueno wrote: > >> I've installed the following simple fix in the trunk. Does it work for you? > [...] >> - (setq tags (list "sign" method "encrypt" method)))) >> + (setq tags (list "sign" method "encrypt" method))) >> + (t >> + (error "Unknown secure mode %s" mode))) > > Seems like a safe, simple fix for a potentially important issue; > so what do you think about putting it in emacs-24? Pushed now (hope it met the deadline).
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(Mon, 23 Sep 2019 11:47:01 GMT) Full text and rfc822 format available.Message #23 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Lars Ingebrigtsen <larsi <at> gnus.org> To: David Bremner <david <at> tethera.net> Cc: 18513 <at> debbugs.gnu.org, Daiki Ueno <ueno <at> gnu.org> Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Mon, 23 Sep 2019 13:46:20 +0200
David Bremner <david <at> tethera.net> writes: > It's definitely an improvement, and it fixes the scenario I reported. On > the other hand, if the use corrupts the #secure tag then essentially the > same behaviour results. Would it be possible to have a strict mode where > any unknown mml tag causes an error? I don't think it's possible to do that in general -- for instance, if the user removes the first three characters from the MML tag (leaving a line with just "ecure ..."), then Message can't know that it's supposed to be secure... So I don't see any way to do this in general, and I'm closing this bug report. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no
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(Mon, 23 Sep 2019 11:47:02 GMT) Full text and rfc822 format available.bug-gnu-emacs <at> gnu.org
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(Mon, 23 Sep 2019 12:19:01 GMT) Full text and rfc822 format available.Message #28 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: David Bremner <david <at> tethera.net> To: Lars Ingebrigtsen <larsi <at> gnus.org> Cc: 18513 <at> debbugs.gnu.org, Daiki Ueno <ueno <at> gnu.org>, Daniel Kahn Gillmor <dkg <at> fifthhorseman.net> Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Mon, 23 Sep 2019 09:18:50 -0300
Lars Ingebrigtsen <larsi <at> gnus.org> writes: > David Bremner <david <at> tethera.net> writes: > >> It's definitely an improvement, and it fixes the scenario I reported. On >> the other hand, if the use corrupts the #secure tag then essentially the >> same behaviour results. Would it be possible to have a strict mode where >> any unknown mml tag causes an error? > > I don't think it's possible to do that in general -- for instance, if > the user removes the first three characters from the MML tag (leaving a > line with just "ecure ..."), then Message can't know that it's supposed > to be secure... > > So I don't see any way to do this in general, and I'm closing this bug > report. > I don't think the fact that we can't do a perfect job is a reason not to improve the error checking. There are many errors that can be detected that currently are not. Is erroring on an unknown mml tag (which nonethless actually looks like a tag) actually difficult? d
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(Mon, 23 Sep 2019 13:54:02 GMT) Full text and rfc822 format available.Message #31 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Lars Ingebrigtsen <larsi <at> gnus.org> To: David Bremner <david <at> tethera.net> Cc: 18513 <at> debbugs.gnu.org, Daiki Ueno <ueno <at> gnu.org>, Daniel Kahn Gillmor <dkg <at> fifthhorseman.net> Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Mon, 23 Sep 2019 15:53:50 +0200
David Bremner <david <at> tethera.net> writes: > I don't think the fact that we can't do a perfect job is a reason not to > improve the error checking. There are many errors that can be detected > that currently are not. Is erroring on an unknown mml tag (which > nonethless actually looks like a tag) actually difficult? It's not difficult to bug out on <#unknown>, but since Message mode buffers mostly free text, doing so would lead to people having their emails fail if they were to type such a thing by hand. MML is only recognised if it's one of the keywords it er recognises. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no
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(Tue, 24 Sep 2019 17:45:01 GMT) Full text and rfc822 format available.Message #34 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Daniel Kahn Gillmor <dkg <at> fifthhorseman.net> To: Lars Ingebrigtsen <larsi <at> gnus.org>, David Bremner <david <at> tethera.net> Cc: 18513 <at> debbugs.gnu.org, Daiki Ueno <ueno <at> gnu.org> Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Tue, 24 Sep 2019 12:49:50 +0200
[Message part 1 (text/plain, inline)]
On Mon 2019-09-23 15:53:50 +0200, Lars Ingebrigtsen wrote: > David Bremner <david <at> tethera.net> writes: > >> I don't think the fact that we can't do a perfect job is a reason not to >> improve the error checking. There are many errors that can be detected >> that currently are not. Is erroring on an unknown mml tag (which >> nonethless actually looks like a tag) actually difficult? > > It's not difficult to bug out on <#unknown>, but since Message mode > buffers mostly free text, doing so would lead to people having their > emails fail if they were to type such a thing by hand. MML is only > recognised if it's one of the keywords it er recognises. It seems to me that there's a sensible balance to be struck, where MML can carve out a recognizable, predictable space, while still not causing unncessary failures. For example, it could try to interpret every sequence that starts with the two characters U+003C LESS-THAN SIGN, U+0023 NUMBER, and ends with U+003E GREATER-THAN SIGN, if those characters are all on a single line. (does mml handle tags split across multiple lines?) But since the goal of this bug report, afaict, is to reduce user error when composing and sending mail in mml-mode, UI/UX feedback choices are pretty critical to making this work right. I do note that mml-mode itself offers some help, because it seems to apply a different textual style to strings that mml will act on. As long as the user can visually distinguish between these textual styles, and assuming that the matching rules in mml-mode are precisely aligned with the mml-based transformation that happens just before a buffer is sent, then the user has some amount of feedback -- but i'm not sure that both of those assumptions holds in a buffer during arbitrary editing. Does it? Even better UX would be a distinct textual style between a valid/actionable mml-tag and an mml-tag that has an error in it, so that the user oomposing the buffer has immediate feedback about potentially problematic strings. Thanks for maintaining MML! --dkg
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(Wed, 25 Sep 2019 13:06:01 GMT) Full text and rfc822 format available.Message #37 received at 18513 <at> debbugs.gnu.org (full text, mbox):
From: Lars Ingebrigtsen <larsi <at> gnus.org> To: Daniel Kahn Gillmor <dkg <at> fifthhorseman.net> Cc: 18513 <at> debbugs.gnu.org, David Bremner <david <at> tethera.net>, Daiki Ueno <ueno <at> gnu.org> Subject: Re: bug#18513: 24.3; message-mode sends unencrypted on error Date: Wed, 25 Sep 2019 15:05:06 +0200
Daniel Kahn Gillmor <dkg <at> fifthhorseman.net> writes: >> It's not difficult to bug out on <#unknown>, but since Message mode >> buffers mostly free text, doing so would lead to people having their >> emails fail if they were to type such a thing by hand. MML is only >> recognised if it's one of the keywords it er recognises. > > It seems to me that there's a sensible balance to be struck, where MML > can carve out a recognizable, predictable space, while still not causing > unncessary failures. > > For example, it could try to interpret every sequence that starts with > the two characters U+003C LESS-THAN SIGN, U+0023 NUMBER, and ends with > U+003E GREATER-THAN SIGN, if those characters are all on a single > line. (does mml handle tags split across multiple lines?) But that would trigger on this <#no-mml tag> and would annoy people. > I do note that mml-mode itself offers some help, because it seems to > apply a different textual style to strings that mml will act on. As > long as the user can visually distinguish between these textual styles, > and assuming that the matching rules in mml-mode are precisely aligned > with the mml-based transformation that happens just before a buffer is > sent, then the user has some amount of feedback -- but i'm not sure that > both of those assumptions holds in a buffer during arbitrary editing. > Does it? I think so. But perhaps there should be a secondary level of testing for encryption-related commands. That is, if you've typed `C-c C-m c p' (for instance), and then the MML parser doesn't find any encryption tags in the buffer, then it could ask something like "You indicated that you wanted this to be encrypted, but it won't be; send anyway?" I mean, you may have used that command and then removed the "secure" tag because you changed your mind, so completely refusing to send probably isn't a good idea. This warning stuff could be done via a buffer-local variable, I guess... Although that wouldn't survive a round trip to the drafts group. Perhaps a header? User-Wants-Encryption: yes ? -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no
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