[Bug 2009230] Re: AppArmor denials for rsyslog

[Andreas Hasenack]

> I just want to check seeing as this profile is only now being enabled
in Lunar :)

Hi Chloé,

indeed this is the first time this profile is being enabled (and
enforced) by default: ubuntu lunar.

Adding the /dev/console rule is easy enough, as you have figured out. I
don't have objections, but would like security's opinion as well. We
could also include the /etc/apparmor.d/abstractions/consoles abstraction
for that matter, although that one also allows access to /dev/pts*.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to rsyslog in Ubuntu.
https://bugs.launchpad.net/bugs/2009230

Title:
  AppArmor denials for rsyslog

Status in gce-compute-image-packages package in Ubuntu:
  New
Status in rsyslog package in Ubuntu:
  New
Status in gce-compute-image-packages source package in Lunar:
  New
Status in rsyslog source package in Lunar:
  New

Bug description:
  The AppArmor profile for rsyslog, which had been disabled on previous
  Ubuntu versions, was enabled in lunar.

  The package google-compute-engine added a config file to rsyslog which
  requires rw access to /dev/console

  google:ubuntu-23.04-64 /root# cat /etc/rsyslog.d/90-google.conf
  # Google Compute Engine default console logging.
  #
  # daemon: logging from Google provided daemons.
  # kern: logging information in case of an unexpected crash during boot.
  #
  daemon,kern.* /dev/console

  google:ubuntu-23.04-64 /root# apt-file search /etc/rsyslog.d/90-google.conf
  google-compute-engine: /etc/rsyslog.d/90-google.conf

  So in gce cloud images, we are getting the following denials:

  [ 1500.302082] audit: type=1400 audit(1677876883.728:495):
  apparmor="DENIED" operation="open" class="file" profile="rsyslogd"
  name="/dev/console" pid=603 comm=72733A6D61696E20513A526567
  requested_mask="ac" denied_mask="ac" fsuid=101 ouid=0

  To fix it, we just need to add
    /dev/console rw,
  to /etc/apparmor.d/usr.sbin.rsyslogd

  or the same permission should be added to a file in
  /etc/apparmor.d/rsyslog.d/ by the google-compute-engine package

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gce-compute-image-packages/+bug/2009230/+subscriptions