bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

[N. Jackson]

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In 25.0.91 there is a change in behaviour when opening gpg encrypted
files.

Previously (Emacs 24, Emacs 25.0.90) when the command that caused an
encrypted file to be opened was issued from the minibuffer, e.g. `C-x
C-f myfile.gpg' or `M-x gnus' (which on my system opens
~/.authinfo.gpg), then the password prompt was displayed in the
minibuffer. (I don't know what the behaviour was when menus were
used; I don't use menus for opening files or starting Gnus.)

This was consistent the "normal" polite behaviour in Emacs: when the
user initiates an action from a command typed in the minibuffer, Emacs
interacts with them in the minibuffer; when they initiate an action
using graphical controls, Emacs interacts with them in graphical
dialogs.

Now the prompt for the gpg password seems to be always in a graphical
dialog box, even when the user was interacting with Emacs from a
keyboard in the minibuffer.

[Additionally, the offending dialog box doesn't make it clear who is
asking for the password nor for which file the password is being
requested(!), and furthermore, the dialog is almost system modal -- it
blocks the entire desktop environment (although virtual terminals can be
reached).]

A screen capture of the dialog box is attached. Note that it doesn't say
what file it is asking for the password for, and there's nothing to say
who is asking for the password.



[-- Attachment #2: Sceeen capture of dialog box --]
[-- Type: image/png, Size: 10666 bytes --]

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In GNU Emacs 25.0.91.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.7)
 of 2016-02-14 built on moondust
Windowing system distributor 'Fedora Project', version 11.0.11800000
System Description:	Fedora release 23 (Twenty Three)

Configured using:
 'configure --prefix=/home/nlj/local/ --enable-checking=yes,glyphs
 'CFLAGS=-O0 -g3 -ggdb''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: en_DK.utf8
  value of $LC_NUMERIC: en_DK.utf8
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Text

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  auto-composition-mode: t
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Recent messages:
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<mouse-6> is undefined
<double-mouse-6> is undefined

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bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

[Glenn Morris]

See http://debbugs.gnu.org/20982 

bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

[N. Jackson]

At 17:56 -0500 on Tuesday 2016-02-16, Glenn Morris wrote:

> See http://debbugs.gnu.org/20982 

Thanks Glenn,

I now vaguely remember reading that at the time, but lacked the
background to follow the discussion. Now I have a bit more context, but
it's still a bit opaque.

===

I tried following the instructions in
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20982#20.

I have pinentry version "pinentry-gtk2 (pinentry) 0.9.6" and gpg2 version
"gpg (GnuPG) 2.1.9".

I put the line

    allow-emacs-pinentry

in ~/.gnupg/gpg-agent.conf (which file did not previously exist).

Then:

0. emacs -Q &

1. M-x pinentry-start

3. C-x C-f myfile.gpg

But I still got the same graphical dialog box for the password prompt.

===

In NEWS it says:

    ** pinentry.el allows GnuPG passphrase to be prompted through the
    minibuffer instead of a graphical dialog, depending on whether the gpg
    command is called from Emacs (i.e., INSIDE_EMACS environment variable
    is set).  This feature requires newer versions of GnuPG (2.1.5 or
    later) and Pinentry (0.9.5 or later).

This seems to be what I want, but if I am reading it correctly, it does
not work.

It seems to say that if the INSIDE_EMACS environment variable is set,
the gpg password prompt will be displayed in the minibuffer.

I even tried starting Emacs with

    export INSIDE_EMACS=t; emacs &

so INSIDE_EMACS is unequivocally defined, but it doesn't help. Even if I do

    M-x pinentry-start

before opening a .gpg file, I'm still being prompted with a graphical
dialog box.

===

There does not seem to be any user documentation for pinentry.el. (There
is no entry in the Emacs manual for "pinentry" and while there is a
pinentry info manual, it is for the 'real' (command line) pinentry, not
for pinentry.el.)

bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

[Glenn Morris]

Adding pinentry author to cc.

N. Jackson wrote:

> At 17:56 -0500 on Tuesday 2016-02-16, Glenn Morris wrote:
>
>> See http://debbugs.gnu.org/20982 
>
> Thanks Glenn,
>
> I now vaguely remember reading that at the time, but lacked the
> background to follow the discussion. Now I have a bit more context, but
> it's still a bit opaque.
>
> ===
>
> I tried following the instructions in
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20982#20.
>
> I have pinentry version "pinentry-gtk2 (pinentry) 0.9.6" and gpg2 version
> "gpg (GnuPG) 2.1.9".
>
> I put the line
>
>     allow-emacs-pinentry
>
> in ~/.gnupg/gpg-agent.conf (which file did not previously exist).
>
> Then:
>
> 0. emacs -Q &
>
> 1. M-x pinentry-start
>
> 3. C-x C-f myfile.gpg
>
> But I still got the same graphical dialog box for the password prompt.
>
> ===
>
> In NEWS it says:
>
>     ** pinentry.el allows GnuPG passphrase to be prompted through the
>     minibuffer instead of a graphical dialog, depending on whether the gpg
>     command is called from Emacs (i.e., INSIDE_EMACS environment variable
>     is set).  This feature requires newer versions of GnuPG (2.1.5 or
>     later) and Pinentry (0.9.5 or later).
>
> This seems to be what I want, but if I am reading it correctly, it does
> not work.
>
> It seems to say that if the INSIDE_EMACS environment variable is set,
> the gpg password prompt will be displayed in the minibuffer.
>
> I even tried starting Emacs with
>
>     export INSIDE_EMACS=t; emacs &
>
> so INSIDE_EMACS is unequivocally defined, but it doesn't help. Even if I do
>
>     M-x pinentry-start
>
> before opening a .gpg file, I'm still being prompted with a graphical
> dialog box.
>
> ===
>
> There does not seem to be any user documentation for pinentry.el. (There
> is no entry in the Emacs manual for "pinentry" and while there is a
> pinentry info manual, it is for the 'real' (command line) pinentry, not
> for pinentry.el.)

bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

[Daiki Ueno]

Glenn Morris <rgm@gnu.org> writes:

> Adding pinentry author to cc.
>
> N. Jackson wrote:
>
>> 0. emacs -Q &
>>
>> 1. M-x pinentry-start
>>
>> 3. C-x C-f myfile.gpg
>>
>> But I still got the same graphical dialog box for the password prompt.

If you do this for the first time on the same session, try restarting
gpg-agent with:

  gpgconf --reload gpg-agent

Regards,
-- 
Daiki Ueno

bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

[N. Jackson]

At 04:00 +0900 on Thursday 2016-02-18, Daiki Ueno wrote:

> If you do this for the first time on the same session, try restarting
> gpg-agent with:
>
>   gpgconf --reload gpg-agent
>

Thanks Daiki, now it works! (Aside from the uninformative prompt -- see
below.)

So it seems that all that is required to have the gpg password prompt
appear in the minibuffer instead of in a graphical dialog box, is for
the user to add

    allow-emacs-pinentry

to a line in ~/.gnupg/gpg-agent.conf (and to restart gpg-agent, if it is
already running, with

    gpgconf --reload gpg-agent

so that it reads the new setting). Nothing else is required; everything
in Emacs works out of the box.

Perhaps this information could be included in the NEWS entry for
pinentry.el? (And an entry in the manual might be nice too, although I'm
not sure where it would live.)


The password prompt, however, fails to identify the file for which the
password is being requested. In Emacs 24 and 25.0.90, the prompt was,
for example,

    Passphrase for symmetric encryption for /home/nlj/.authinfo.gpg:

Now there is a small buffer displaying

    Enter passphrase

followed by a few blank lines, and, then in the minibuffer, the prompt

    Passphrase:

Could the prompt in the minibuffer (or the text in the little buffer)
not show the name of the file? In fact, what purpose does the little
buffer serve? It seems to clutter up the interface and not add anything
useful. Or am I missing something there?

For completeness, although I do not expect to use it myself, I think
that the prompt in the graphical dialog box would also be improved by
stating the file name, and in this case it would also be useful if it
identified Emacs as being the source of the prompt.

Thanks.

N.

bug#22711: 25.0.91; prompt for gpg password is displayed in a dialog box rather than in the minibuffer

[Daiki Ueno]

Thanks for the feedback.

nljlistbox2@gmail.com (N. Jackson) writes:

> Perhaps this information could be included in the NEWS entry for
> pinentry.el? (And an entry in the manual might be nice too, although I'm
> not sure where it would live.)

Sure, will do.

> The password prompt, however, fails to identify the file for which the
> password is being requested. In Emacs 24 and 25.0.90, the prompt was,
> for example,
>
>     Passphrase for symmetric encryption for /home/nlj/.authinfo.gpg:
>
> Now there is a small buffer displaying
>
>     Enter passphrase
>
> followed by a few blank lines, and, then in the minibuffer, the prompt
>
>     Passphrase:
>
> Could the prompt in the minibuffer (or the text in the little buffer)
> not show the name of the file?

That could be a bit tricky since Pinentry is not called with such
information, but perhaps it might be possible by sending context
information through the special envvar PINENTRY_USER_DATA.  I have just
proposed a patch to Pinentry for that.

> In fact, what purpose does the little buffer serve? It seems to
> clutter up the interface and not add anything useful. Or am I missing
> something there?

If public key encryption were used, the buffer would contain something like:

    Please enter the passphrase to unlock the OpenPGP secret key:
    "Daiki Ueno <ueno@unixuser.org>"
    4096-bit RSA key, ID C8C530D6,
    created 2010-02-04 (main key ID D7E69871).

For the case like the above, we could hide the buffer (though this is
also a bit tricky since the strings may be translated in user's native
language).

Regards,
-- 
Daiki Ueno