libreoffice doesn't list gpg private key for a digital signature due to apparmor

Status changed to 'Confirmed' because the bug affects multiple users.

On my computer (Ubuntu Mate 20.04) this problem also causes the Tool, Options dialog to hang for around 1 minute while trying to connect to the GPG agent. The /var/log/syslog file lists lots of apparmor DENIED entries and the strace of the soffice program show lots of "gpg: can't connect to the agent" errors for around one minute.

My solution was also to modify the /etc/apparmor.d/usr.lib.libreoffice.program.soffice.bin file to add to the gpg profile section (just like zunda user did):

    owner /{,var/}run/user/[0-9]*/gnupg/S.gpg-agent rw,
    owner @{HOME}/.gnupg/* rw,

(the second line seems not to be required to sign the document but is required to use the functions of the Certificate Manager, like adding new keys).

Confirming using those steps on focal
- create a new document in writer and save it
- do file -> digital signature -> digital signature -> signing document
- the dialog lists no key

it correctly lists the key after doing
$ sudo aa-complain usr.lib.libreoffice.program.soffice.bin

Just upgraded to 20.10 and the bundled LibreOffice version (7.0.2.2) and have the same issue.

I can confirm mvaldez's fix for adding access for the GPG agent worked for me. However, I didn't change the "@{HOME}/.gnupg/*" directive to rw (I don't really want LibreOffice having write access to my gpg stuff!

Seems to work fine for me for choosing my key from tools->options or File->Digital Signatures then "Sign Document". Clicking "Start Certificate Manager" launches seahorse as expected.

Wouldn't it be better to somehow hook this value to GPG_AGENT_INFO or XDG_RUNTIME_DIR though?

I just wanted to add that I had this issue for a while too on Ubuntu 20.04.1 LTS. None of the above solutions worked for me but what did work was installing and using gnupg2.

Then edit /etc/apparmor.d/usr.lib.libreoffice.program.soffice.bin to use gpg2 instead of gpg. So I edit the line /usr/bin/gpg rm to /usr/bin/gpg2 like below:

  # there is abstractions/gnupg but that's just for gpg1...
  profile gpg {
    #include <abstractions/base>

   /usr/bin/gpgconf rm,
   /usr/bin/gpg2 rm,
   /usr/bin/gpgsm rm,

    owner @{HOME}/.gnupg/* r,
    owner @{HOME}/.gnupg/random_seed rk,
  }

  # probably should become a subprofile like gpg above, but then it doesn't
  # work either as it tries to access stuff only allowed above...

I hope this works for others too! My key generation took a while but it worked.

Confirming that fix suggested by Zunda in the bug description works for me on Ubuntu 20.04.2 LTS and LibreOffice Ubuntu package version: 1:7.1.1~rc2-0ubuntu0.20.04.1~lo1.

Below, the fix I repeated again just to make sure everybody understand exactly what I did.

--- apparmor.d.20200702/usr.lib.libreoffice.program.soffice.bin 2019-10-03 10:31:21.000000000 -1000
+++ apparmor.d/usr.lib.libreoffice.program.soffice.bin 2020-07-02 08:59:44.516754728 -1000
@@ -223,6 +223,7 @@

     owner @{HOME}/.gnupg/* r,
     owner @{HOME}/.gnupg/random_seed rk,
+ owner /{,var/}run/user/*/** rw,
   }

Thanks all!

This bug was fixed in the package libreoffice - 1:7.1.2~rc2-0ubuntu1

---------------
libreoffice (1:7.1.2~rc2-0ubuntu1) hirsute; urgency=medium

  [ Rico Tzschichholz ]
  * New upstream release candidate
  * Bump yaru source to "2021-03-14" and add yaru-mate styles
  * Fix signing documents with enforced apparmor (LP: #1886092)
  * Disable lto due to insufficient disc space on amd64 builder

  [ Matthias Klose ]
  * Fix lto build, avoiding to pass lto flags to the skia build.

 -- Rico Tzschichholz <email address hidden> Sat, 27 Mar 2021 16:01:35 +0100

Today I upgraded libreoffice via PPA from version 7.1.2 to version 7.1.4 where the digital document signature function stopped working. When informed about the resolution of this bug in version 7.1.2, I didn't find the date of update of libreoffice from version 6.4.7 to 7.1.2 in ubuntu version 20.04, so I decided to test version 7.1.2 via PPA and it worked. With the update via PPA this function was now stopped working with version 7.1.4. Is there any relationship in ubuntu regarding these libreoffice versions?

Marcelo, you can see which versions of libreoffice are packaged in which Ubuntu releases via the libreoffice source package page on launchpad https://launchpad.net/ubuntu/+source/libreoffice

There's a link at the bottom of that page to help you explore versions that might be published in PPAs.

Thanks

This bug was fixed in the package libreoffice - 1:7.0.6-0ubuntu0.20.10.1

---------------
libreoffice (1:7.0.6-0ubuntu0.20.10.1) groovy; urgency=medium

  * New upstream release (LP: #1928642)
  * Update yaru icon style "2021-03-14"
  * apparmor: Fix signing documents with enforced apparmor
  * apparmor: Allow one more digit in temp files

 -- Rico Tzschichholz <email address hidden> Tue, 18 May 2021 11:25:50 +0200