bug#22405: 25.1.50; Recent changes break epg's ability to read from the gpg card

bug#22405: 25.1.50; Recent changes break epg's ability to read from the gpg card

[Manoj Srivastava]

Hi,

        I have a gpg card which I use to store my signing sub keys
on. Sometime between December 15 and January 15th, I can no longer send
gpg signed emails using mml2016 and epg when I use a secring.gpg that
refers to keys on the card.

        I can:
 1. Read mail in Gnus and decrypt encrypted emails sent to me
 2. Load gpg encrypted .el files during startup.
 3. Verify signatures in emails.

 If I try to send a gpg signed message, I get the error with the
back trace appended below. Based on trying to step through the
mml2015-sign  function, epg-sign-string returns nil, which leads to the
error.  epg does seem to talk to the card: I am prompted for a PIN (not
a passphrase), and the card signature count does get incremented.

        When I replace the secring.pgp with one that contains my mey
itself, I can successfully  sign emails. I can consistently reproduce
this failure.

        Manoj
     
 --8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (error "Process epg not running")
  signal(error ("Process epg not running"))
  (condition-case error (setq signature (epg-sign-string context (buffer-string) t) mml2015-epg-secret-key-id-list nil) (error (while mml2015-epg-secret-key-id-list (password-cache-remove (car mml2015-epg-secret-key-id-list)) (setq mml2015-epg-secret-key-id-list (cdr mml2015-epg-secret-key-id-list))) (signal (car error) (cdr error))))
  (let* ((inhibit-redisplay t) (context (epg-make-context)) (boundary (mml-compute-boundary cont)) (sender (message-options-get (quote message-sender))) (signer-names (or mml2015-signers (if (and mml2015-sign-with-sender sender) (list (concat "<" sender ">"))))) signer-key (signers (or (message-options-get (quote mml2015-epg-signers)) (message-options-set (quote mml2015-epg-signers) (if (eq mm-sign-option (quote guided)) (epa-select-keys context "Select keys for signing.\nIf no one is selected, default secret key is used.  " signer-names t) (if (or sender mml2015-signers) (delq nil ...)))))) signature micalg) (epg-context-set-armor context t) (epg-context-set-textmode context t) (epg-context-set-signers context signers) (if mml2015-cache-passphrase (epg-context-set-passphrase-callback context (function mml2015-epg-passphrase-callback))) (goto-char (point-max)) (if (bolp) nil (insert "\n")) (condition-case error (setq signature (epg-sign-string context (buffer-string) t) mml2015-epg-secret-key-id-list nil) (error (while mml2015-epg-secret-key-id-list (password-cache-remove (car mml2015-epg-secret-key-id-list)) (setq mml2015-epg-secret-key-id-list (cdr mml2015-epg-secret-key-id-list))) (signal (car error) (cdr error)))) (if (epg-context-result-for context (quote sign)) (setq micalg (let ((cl-x (car (epg-context-result-for context ...)))) (progn nil (or (and (memq ... cl-struct-epg-new-signature-tags)) (signal (quote wrong-type-argument) (list ... cl-x))) (aref cl-x 3))))) (goto-char (point-min)) (insert (format "Content-Type: multipart/signed; boundary=\"%s\";\n" boundary)) (if micalg (insert (format "	micalg=pgp-%s; " (downcase (cdr (assq micalg epg-digest-algorithm-alist)))))) (insert "protocol=\"application/pgp-signature\"\n") (insert (format "\n--%s\n" boundary)) (goto-char (point-max)) (insert (format "\n--%s\n" boundary)) (insert "Content-Type: application/pgp-signature; name=\"signature.asc\"\n\n") (insert signature) (goto-char (point-max)) (insert (format "--%s--\n" boundary)) (goto-char (point-max)))
  mml2015-epg-sign((part (sign . "pgpmime") (tag-location . 1611) (contents . "This is a test.\n")))
  funcall(mml2015-epg-sign (part (sign . "pgpmime") (tag-location . 1611) (contents . "This is a test.\n")))
  (if func (funcall func cont) (error "Cannot find sign function"))
  (let ((func (nth 1 (assq mml2015-use mml2015-function-alist)))) (if func (funcall func cont) (error "Cannot find sign function")))
  mml2015-sign((part (sign . "pgpmime") (tag-location . 1611) (contents . "This is a test.\n")))
  mml-pgpmime-sign-buffer((part (sign . "pgpmime") (tag-location . 1611) (contents . "This is a test.\n")))
  mml-generate-mime-1((part (sign . "pgpmime") (tag-location . 1611) (contents . "This is a test.\n")))
  mml-generate-mime()
  message-encode-message-body()
  message-send-mail(nil)
  message-send-via-mail(nil)
  message-send(nil)
  message-send-and-exit(nil)
  funcall-interactively(message-send-and-exit nil)
  call-interactively(message-send-and-exit nil nil)
  command-execute(message-send-and-exit)
--8<---------------cut here---------------end--------------->8---


In GNU Emacs 25.1.50.3 (x86_64-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2016-01-18, modified by Manoj built on glaurung.internal.golden-gryphon.com
Repository revision: 1a78818d567d0e2047820dfb054e87582ae75350
Windowing system distributor 'The X.Org Foundation', version 11.0.11703000
System Description:	Debian GNU/Linux unstable (sid)

Configured using:
 'configure --with-x-toolkit=lucid --with-dbus --with-gpm --with-pop=yes
 --with-xpm --with-jpeg --with-tiff --with-gif --with-png --with-x
 --with-imagemagick --with-xft --with-rsvg --with-libotf --without-w32
 --with-sound=yes'

Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF
GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF
XFT ZLIB TOOLKIT_SCROLL_BARS LUCID X11

Important settings:
  value of $LC_ALL: en_US.UTF-8
  value of $LC_COLLATE: POSIX
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8

Major mode: Summary

Minor modes in effect:
  indent-guide-global-mode: t
  indent-guide-mode: t
  global-edit-server-edit-mode: t
  global-auto-complete-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  TeX-PDF-mode: t
  global-smart-tab-mode: t
  electric-pair-mode: t
  highlight-changes-visible-mode: t
  diff-auto-refine-mode: t
  erc-spelling-mode: t
  erc-sound-mode: t
  erc-services-mode: t
  erc-replace-mode: t
  erc-page-mode: t
  erc-notifications-mode: t
  erc-notify-mode: t
  erc-log-mode: t
  erc-autoaway-mode: t
  erc-bbdb-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-netsplit-mode: t
  erc-hl-nicks-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-unmorse-mode: t
  erc-smiley-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  icomplete-mode: t
  ido-everywhere: t
  global-semantic-mru-bookmark-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-completions-mode: t
  global-semantic-idle-scheduler-mode: t
  global-semantic-idle-summary-mode: t
  global-semantic-decoration-mode: t
  global-semantic-highlight-func-mode: t
  global-semantic-stickyfunc-mode: t
  global-semantic-show-unmatched-syntax-mode: t
  global-semantic-highlight-edits-mode: t
  semantic-mode: t
  global-linum-mode: t
  linum-mode: t
  global-auto-revert-mode: t
  which-function-mode: t
  savehist-mode: t
  winner-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  show-paren-mode: t
  display-time-mode: t
  cua-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-quote-mode: t
  electric-layout-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Recent messages:
Generating hashcash...done
Mark set [2 times]
Invalid face reference: gnus-user-agent-good-face [3 times]
Entering debugger...
Invalid face reference: gnus-user-agent-good-face
Auto-saving...done
Mark activated
C-?:help C-z:undo C-x:cut C-c:copy C-v:paste S-ret:rect
Back to top level
Invalid face reference: gnus-user-agent-good-face [9 times]

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/usr/local/share/emacs/site-lisp/debian-startup hides /usr/local/share/emacs/site-lisp/emacs24/debian-startup
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Features:
(shadow emacsbug cus-edit compface skeleton sh-script smie url-queue
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morse vc vc-dispatcher mailalias smtpmail qp canlock log-mail sort
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nnml gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-cache
spam spam-stat gnus-uu yenc bbdb-gnus gnus-demon nntp gnus-registry
registry nnrss mm-url remember indent-guide ropemacs pymacs cdlatex
texmathp org-docview doc-view image-mode org-w3m org-irc org-indent
org-info org-gnus org-bibtex bibtex org-bbdb org-id org-mouse diary-lib
diary-loaddefs my-org ob-sh iimage ox-icalendar ox-ascii ox-beamer
ox-latex ox-man ox-md ox-html ox-publish ox-odt rng-loc rng-uri
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nxml-enc xmltok nxml-util ox-texinfo ox-org ox org-clock org-habit
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org-agenda google-maps google-maps-static google-maps-geocode
google-maps-base org-element avl-tree org-inset-dblock org org-macro
org-footnote org-pcomplete org-list org-faces org-entities noutline
outline org-version ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table
ob-exp org-src ob-keys ob-comint ob-core ob-eval org-compat org-macs
org-loaddefs cal-menu calendar cal-loaddefs edit-server
auto-complete-config auto-complete flycheck-ycmd ycmd
ycmd-request-deferred ycmd-request url-http url-auth url-gw puny etags
popup json map hmac-def f s deferred dropdown-list java-snippets
yasnippet ess-toolbar ess-mouse mouseme ess-menu ess-swv ess-noweb
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ess-site tex-fold font-latex tex crm browse-kill-ring dedicated all
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rx subr-x dash clipmon perltidy-mode perlcritic debian-changelog-mode
smart-tab ecb ecb-symboldef ecb-analyse ecb-compatibility
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ecb-create-layout ecb-compilation ecb-common-browser ecb-navigate
eieio-compat ecb-mode-line ecb-face tree-buffer ecb-upgrade
ecb-cedet-wrapper ecb-util member-function elec-pair manoj-dark-theme
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erc-log erc-autoaway erc-bbdb bbdb-hooks bbdb-gui bbdb-com bbdb timezone
erc-list erc-menu erc-join erc-ring erc-networks erc-pcomplete erc-track
erc-match erc-netsplit erc-hl-nicks color cl erc-button erc-fill
erc-stamp erc-goodies erc erc-backend erc-compat thingatpt pp debian-bug
apt-utils jka-compr browse-url apt-sources table icomplete ido seq
ibuffer ibuffer-loaddefs wdired dired-x epa-dired hashcash gnus-dired
gnus-msg gnus-art mm-uu mml2015 mm-view mml-smime gnus-sum gnus-group
gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source tls gnutls
utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range gnus-win gnus
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ede/autoconf-edit autoconf autoconf-mode ede/generic semantic/db
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semantic/fw mode-local ede/shell ede/config ede/speedbar ede/files ede
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filladapt autoinsert header2 xref project whitespace flow-ctrl cua-rect
rect which-func imenu framepop savehist windmove winner tramp-cache
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<#secure method=pgpmime mode=sign>

-- 
Marriage is a three ring circus: The engagement ring, the wedding ring,
and the suffering.
Manoj Srivastava <srivasta@acm.org> <http://www.golden-gryphon.com/>  
4096R/C5779A1C E37E 5EC5 2A01 DA25 AD20  05B6 CF48 9438 C577 9A1C

bug#22405: 25.1.50; Recent changes break epg's ability to read from the gpg card

[Daiki Ueno]

Manoj Srivastava <srivasta@golden-gryphon.com> writes:

>         I have a gpg card which I use to store my signing sub keys
> on. Sometime between December 15 and January 15th, I can no longer send
> gpg signed emails using mml2016 and epg when I use a secring.gpg that
> refers to keys on the card.
>
>         I can:
>  1. Read mail in Gnus and decrypt encrypted emails sent to me
>  2. Load gpg encrypted .el files during startup.
>  3. Verify signatures in emails.
>
>  If I try to send a gpg signed message, I get the error with the
> back trace appended below. Based on trying to step through the
> mml2015-sign  function, epg-sign-string returns nil, which leads to the
> error.  epg does seem to talk to the card: I am prompted for a PIN (not
> a passphrase), and the card signature count does get incremented.
>
>         When I replace the secring.pgp with one that contains my mey
> itself, I can successfully  sign emails. I can consistently reproduce
> this failure.

I don't see any significant change in epg during that period, but there
are potentially several factors (e.g. new GnuPG versions, mml2015
rework) that could cause the problem.  Could you try `M-x
epa-sign-region' to isolate the problem?

Also I would like to ask you to gather more information with the steps
described in:
http://www.gnu.org/software/emacs/manual/html_node/epa/Bug-Reports.html#Bug-Reports

Thanks,
-- 
Daiki Ueno