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[Bug 1454463] Re: CUPS not allowed to mknod to /var/log by apparmor

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Seth Arnold <1454463@xxxxxxxxxxxxxxxxxx>
Date: Wed, 13 May 2015 19:57:06 -0000
Reply-to: Bug 1454463 <1454463@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Great, I'm glad that was it! Have fun.

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https://bugs.launchpad.net/bugs/1454463

Title:
  CUPS not allowed to mknod to /var/log by apparmor

Status in cups package in Ubuntu:
  Invalid

Bug description:
  I have a two-machine network, both running 14.04.1 but mostly updated.
  CUPS version is 1.7.2-0ubuntu1

  Machine A - has printer attached
  Machine B - printing to A doesn't work via CUPS

  I cannot print to the CUPS-managed printer attached to A from B,
  except with a few apps which see the printer directly via avahi (e.g.
  Evince).

  I can print to the printer from A.

  /var/log/syslog on B shows:

  ay 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/error_log" - Permission denied
  May 13 09:50:29 server kernel: [47923.441374] type=1400 audit(1431474629.549:811): apparmor="DENIED" operation="mknod" profile="/usr/sbin/cupsd" name="/data/var/cache/cups/job.cache.N" pid=7814 comm="cupsd" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  May 13 09:50:29 server kernel: [47923.441413] type=1400 audit(1431474629.549:812): apparmor="DENIED" operation="mknod" profile="/usr/sbin/cupsd" name="/data/var/log/cups/error_log" pid=7814 comm="cupsd" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  May 13 09:50:29 server kernel: [47923.441421] type=1400 audit(1431474629.549:813): apparmor="DENIED" operation="chown" profile="/usr/sbin/cupsd" name="/data/var/log/cups/" pid=7814 comm="cupsd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
  May 13 09:50:29 server kernel: [47923.441444] type=1400 audit(1431474629.549:814): apparmor="DENIED" operation="mknod" profile="/usr/sbin/cupsd" name="/data/var/log/cups/error_log" pid=7814 comm="cupsd" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  May 13 09:50:29 server kernel: [47923.706282] type=1400 audit(1431474629.817:815): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=16874 comm="apparmor_parser"
  May 13 09:50:29 server kernel: [47923.706551] type=1400 audit(1431474629.817:816): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=16874 comm="apparmor_parser"
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/access_log" - Permission denied
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/error_log" - Permission denied
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/page_log" - Permission denied
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/error_log" - Permission denied
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/error_log" - Permission denied
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/error_log" - Permission denied
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/error_log" - Permission denied
  May 13 09:50:29 server cupsd: Unable to change ownership of "/var/log/cups" - Permission denied
  May 13 09:50:29 server cupsd: Unable to open log file "/var/log/cups/error_log" - Permission denied
  May 13 09:50:29 server kernel: [47923.710922] type=1400 audit(1431474629.821:817): apparmor="DENIED" operation="mknod" profile="/usr/sbin/cupsd" name="/data/var/log/cups/access_log" pid=16884 comm="cupsd" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  May 13 09:50:29 server kernel: [47923.710931] type=1400 audit(1431474629.821:818): apparmor="DENIED" operation="chown" profile="/usr/sbin/cupsd" name="/data/var/log/cups/" pid=16884 comm="cupsd" requested_mask="w" denied_mask="w" fsuid=0 ouid=0
  May 13 09:50:29 server kernel: [47923.710964] type=1400 audit(1431474629.821:819): apparmor="DENIED" operation="mknod" profile="/usr/sbin/cupsd" name="/data/var/log/cups/access_log" pid=16884 comm="cupsd" requested_mask="c" denied_mask="c" fsuid=0 ouid=0
  May 13 09:50:29 server kernel: [47923.710985] type=1400 audit(1431474629.821:820): apparmor="DENIED" operation="mknod" profile="/usr/sbin/cupsd" name="/data/var/log/cups/error_log" pid=16884 comm="cupsd" requested_mask="c" denied_mask="c" fsuid=0 ouid=0

  Google search yields similar but significantly different (and ancient)
  bugs.  For example
  https://bugs.launchpad.net/ubuntu/+source/cups/+bug/810687 didn't
  allow CUPS to start, but CUPS does start, just doesn't work.  Also
  that bug was reportedly fixed in CUPS 1.4.7.

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References

[Bug 1454463] [NEW] CUPS not allowed to mknod to /var/log by apparmor
From: Greg Bell, 2015-05-13