[Bug 1890177] Re: rsyslogd: file '/dev/console': open error: Permission denied

[Timo Aaltonen]

Hello Eric, or anyone else affected,

Accepted rsyslog into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/rsyslog/8.2001.0-1ubuntu1.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: rsyslog (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1890177

Title:
  rsyslogd: file '/dev/console': open error: Permission denied

Status in rsyslog package in Ubuntu:
  New
Status in rsyslog source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  At the moment rsyslog cannot have access /dev/console due to a
  mismatch permission/ownership between '/dev/console' and the Privilege
  Drop User and Group 'syslog' in rsyslog.

  [Test Case]

  * Deploy focal/20.04LTS (tested in gcloud instance)
  * Install rsyslog
  * systemctl restart rsyslog OR systemctl restart rsyslog
  * Inspect /var/log/syslog for the following error:
  syslog:Aug  4 14:37:56 <HOSTNAME> rsyslogd: file '/dev/console': open error: Permission denied [v8.2001.0 try https://www.rsyslog.com/e/2433 ]

  [Regression potential]

  https://bugs.launchpad.net/ubuntu/+source/rsyslog/+bug/1890177/comments/4

  [Other information]

  Other bug:
  https://github.com/GoogleCloudPlatform/compute-image-packages/issues/889

  [Original description]

  The Privilege Drop options ($PrivDrop*) in focal's rsyslog both point
  to 'syslog' for the user and group, and don't match the
  ownership/permission of '/dev/console' generating the following:

  syslog:Aug  3 15:16:58 <HOSTNAME> rsyslogd: file '/dev/console': open
  error: Permission denied [v8.2001.0 try https://www.rsyslog.com/e/2433
  ]

  Looking in Bionic/18.04LTS, '/dev/console' used to be root:syslog[1],
  nowadays it's root:tty[2]

  [1] - Bionic/18.04LTS (Gcloud instance)
  # ls -l /dev/console
  crw--w---- 1 root syslog 5, 1 Aug  3 15:17 /dev/console

  [2] - Focal/20.04LTS (Gcloud instance)
  # ls -l /dev/console
  crw--w---- 1 root tty 5, 1 Aug  3 17:19 /dev/console

  # /etc/rsyslog.conf
  $PrivDropToUser syslog
  $PrivDropToGroup syslog

  ** As a debug exercise I did the following:
  - Cannot reproduce the situation if I intentionally get rid of the PrivDrop* options.
  - Cannot reproduce the situation if I intentionally add 'syslog' user member of 'tty' group.

  Meaning that it's pretty obvious with the above statement that the
  permission denied is caused by the permission/ownership mismatch
  between '/dev/console' 's ownership permission & syslog user
  (PrivDropTo[User|Group]).

  Other bug:
  https://github.com/GoogleCloudPlatform/compute-image-packages/issues/889

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