GNU bug report logs - #29907
25.3; Easy PG should warn users that passphrases are not cached forever

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: John Williams <johnfrombluff <at> gmail.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 25.3;
 Easy PG should warn users that passphrases are not cached forever
Date: Sat, 30 Dec 2017 02:18:36 +0000

[Message part 1 (text/plain, inline)]

I encrypted a file using Easy PG. When I did so, I specified a pass
phrase via a window manager pop-up dialog and checked the option to save
the pass phrase in the "keyring". I am using GNOME, so I assumed that
the "keyring" in question was Seahorse.

I opened the file again and was not prompted for the pass phrase. I was
happy. I rebooted to see if the cache was ephemeral, and lo, it was
not. I was happy.

A few days later, I attempted to open the file again, and was prompted
for the password. I had forgotten it, and now there is no way to access
the contents of the file. I am very sad, because the contents of the
file are worth about $20,000 to me.

Mea culpa. I should not have trusted software for such an important task
without reading the manual. But after reading the manual, I find no
mention that the pass phrase caching is ephemeral. After much Googling,
I found out about gpg-agent and max-cache-ttl.

I don't think it's reasonable to expect users to read long manuals, or
already be experts in underlying technology, in order to use simple
functionality. I also think the the dialog that prompts for a pass
phrase should inform the user about default-cache-ttl and max-cache-ttl.

I also think the dialog, and the manual, should emphasise very strongly
that pass phrases are not cached forever.

Thanks for Easy PG, and thanks for Emacs!

A grateful but very sad user



In GNU Emacs 25.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.22.19)
 of 2017-09-15 built on buildvm-31.phx2.fedoraproject.org
Windowing system distributor 'Fedora Project', version 11.0.11905000
System Description:    Fedora release 27 (Twenty Seven)

Configured using:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-x-toolkit=gtk3
 --with-gpm=no --with-xwidgets --with-modules
 build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Werror=format-security
 -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong
 --param=ssp-buffer-size=4 -grecord-gcc-switches
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic'
 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig'

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 MODULES XWIDGETS

Important settings:
  value of $LANG: en_NZ.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Org

Minor modes in effect:
  flyspell-mode: t
  org-bullets-mode: t
  override-global-mode: t
  savehist-mode: t
  recentf-mode: t
  helm-mode: t
  async-bytecomp-package-mode: t
  desktop-save-mode: 1
  show-paren-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-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
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: org-auto-fill-function
  transient-mark-mode: t

Recent messages:
(No changes need to be saved)
Decrypting /home/john/Documents/Investment/Blockchain/keys.gpg...done
epa-file--find-file-not-found-function: Opening input file: Decryption
failed,
Quit [5 times]
(No changes need to be saved)
Saving file /home/john/Documents/Investment/Blockchain/credentials.org...
Wrote /home/john/Documents/Investment/Blockchain/credentials.org
Saving file /home/john/Documents/Investment/Blockchain/credentials.org...
Wrote /home/john/Documents/Investment/Blockchain/credentials.org
(No changes need to be saved)

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Memory information:
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[Message part 2 (text/html, inline)]

Message #8 received at 29907 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: John Williams <johnfrombluff <at> gmail.com>
Cc: 29907 <at> debbugs.gnu.org
Subject: Re: bug#29907: 25.3;
 Easy PG should warn users that passphrases are not cached forever
Date: Sun, 28 Jan 2018 11:29:45 -0500

John Williams <johnfrombluff <at> gmail.com> writes:

> I encrypted a file using Easy PG. When I did so, I specified a pass
> phrase via a window manager pop-up dialog and checked the option to
> save the pass phrase in the "keyring". I am using GNOME, so I assumed
> that the "keyring" in question was Seahorse.
>
> I opened the file again and was not prompted for the pass phrase. I
> was happy. I rebooted to see if the cache was ephemeral, and lo, it
> was not. I was happy.
>
> A few days later, I attempted to open the file again, and was prompted
> for the password. I had forgotten it, and now there is no way to
> access the contents of the file. I am very sad, because the contents
> of the file are worth about $20,000 to me.

Hmm, I don't think gpg-agent caches over reboots, so I wonder what saved
your pass phrase the first time.

> Mea culpa. I should not have trusted software for such an important
> task without reading the manual. But after reading the manual, I find
> no mention that the pass phrase caching is ephemeral. After much
> Googling, I found out about gpg-agent and max-cache-ttl.
>
> I don't think it's reasonable to expect users to read long manuals, or
> already be experts in underlying technology, in order to use simple
> functionality. I also think the the dialog that prompts for a pass
> phrase should inform the user about default-cache-ttl and
> max-cache-ttl.
>
> I also think the dialog, and the manual, should emphasise very
> strongly that pass phrases are not cached forever.

I somewhat feel that the term "cache" already implies temporary, but
saying it explicitly shouldn't hurt I guess.  Emacs is not in control of
the dialog at all, so we cannot affect that.

--- i/doc/misc/epa.texi
+++ w/doc/misc/epa.texi
@@ -474,7 +474,9 @@ Caching Passphrases
 
 Typing passphrases is a troublesome task if you frequently open and
 close the same file.  GnuPG and EasyPG Assistant provide mechanisms to
-remember your passphrases.  However, the configuration is a bit
+remember your passphrases for a limited time.  Using these, you only
+need to re-enter the passphrase occasionally.
+However, the configuration is a bit
 confusing since it depends on your GnuPG installation <at> xref{GnuPG
 version compatibility}, encryption method (symmetric or public key),
 and whether or not you want to use gpg-agent.  Here are some

Message #11 received at 29907 <at> debbugs.gnu.org (full text, mbox):

From: John Williams <johnfrombluff <at> gmail.com>
To: Noam Postavsky <npostavs <at> users.sourceforge.net>
Cc: 29907 <at> debbugs.gnu.org
Subject: Re: bug#29907: 25.3; Easy PG should warn users that passphrases are
 not cached forever
Date: Sun, 28 Jan 2018 18:31:28 +0000

[Message part 1 (text/plain, inline)]

Thanks!

On Mon, 29 Jan 2018 at 05:29 Noam Postavsky <npostavs <at> users.sourceforge.net>
wrote:

> John Williams <johnfrombluff <at> gmail.com> writes:
>
> > I encrypted a file using Easy PG. When I did so, I specified a pass
> > phrase via a window manager pop-up dialog and checked the option to
> > save the pass phrase in the "keyring". I am using GNOME, so I assumed
> > that the "keyring" in question was Seahorse.
> >
> > I opened the file again and was not prompted for the pass phrase. I
> > was happy. I rebooted to see if the cache was ephemeral, and lo, it
> > was not. I was happy.
> >
> > A few days later, I attempted to open the file again, and was prompted
> > for the password. I had forgotten it, and now there is no way to
> > access the contents of the file. I am very sad, because the contents
> > of the file are worth about $20,000 to me.
>
> Hmm, I don't think gpg-agent caches over reboots, so I wonder what saved
> your pass phrase the first time.
>
> > Mea culpa. I should not have trusted software for such an important
> > task without reading the manual. But after reading the manual, I find
> > no mention that the pass phrase caching is ephemeral. After much
> > Googling, I found out about gpg-agent and max-cache-ttl.
> >
> > I don't think it's reasonable to expect users to read long manuals, or
> > already be experts in underlying technology, in order to use simple
> > functionality. I also think the the dialog that prompts for a pass
> > phrase should inform the user about default-cache-ttl and
> > max-cache-ttl.
> >
> > I also think the dialog, and the manual, should emphasise very
> > strongly that pass phrases are not cached forever.
>
> I somewhat feel that the term "cache" already implies temporary, but
> saying it explicitly shouldn't hurt I guess.  Emacs is not in control of
> the dialog at all, so we cannot affect that.
>
> --- i/doc/misc/epa.texi
> +++ w/doc/misc/epa.texi
> @@ -474,7 +474,9 @@ Caching Passphrases
>
>  Typing passphrases is a troublesome task if you frequently open and
>  close the same file.  GnuPG and EasyPG Assistant provide mechanisms to
> -remember your passphrases.  However, the configuration is a bit
> +remember your passphrases for a limited time.  Using these, you only
> +need to re-enter the passphrase occasionally.
> +However, the configuration is a bit
>  confusing since it depends on your GnuPG installation <at> xref{GnuPG
>  version compatibility}, encryption method (symmetric or public key),
>  and whether or not you want to use gpg-agent.  Here are some
>

[Message part 2 (text/html, inline)]

Message #14 received at 29907 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: John Williams <johnfrombluff <at> gmail.com>
Cc: 29907 <at> debbugs.gnu.org
Subject: Re: bug#29907: 25.3;
 Easy PG should warn users that passphrases are not cached forever
Date: Tue, 30 Jan 2018 22:36:52 -0500

tags 29907 fixed
close 29907 26.1
quit

John Williams <johnfrombluff <at> gmail.com> writes:

> Thanks! 

>      close the same file.  GnuPG and EasyPG Assistant provide mechanisms to
>     -remember your passphrases.  However, the configuration is a bit
>     +remember your passphrases for a limited time.  Using these, you only
>     +need to re-enter the passphrase occasionally.

Pushed to emacs-26

[1: 9e6889c65a]: 2018-01-30 22:14:02 -0500
  Emphasize that GPG passphrase caching is temporary (Bug#29907)
  https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=9e6889c65af15b80db3f19064a765c1d3a198b87

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