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In focal users of mdns get denials in apparmor confined applications.
An exampel can be found in the original bug below.
It seems it is a common pattern, see
https://github.com/lathiat/nss-mdns#etcmdnsallow
Therefore I'm asking to add
/etc/mdns.allow r,
to the file
/etc/apparmor.d/abstractions/mdns"
by default.
--- original bug ---
Many repetitions of
audit: type=1400 audit(1585517168.705:63): apparmor="DENIED" operation="open" profile="/usr/sbin/chronyd" name="/etc/mdns.allow" pid=1983815 comm="chronyd" requested_mask="r" denied_mask="r" fsuid=123 ouid=0
in log. I use libnss-mdns for .local name resolution, so /etc/nsswitch.conf contains
hosts: files mdns [NOTFOUND=return] myhostname dns
and /etc/mnds.allow contains the domains to resolve with mDNS (in may case, "local." and "local"; see /usr/share/doc/libnss-mdns/README.html.)
Presumably cronyd calls a gethostbyX() somewhere, thus eventually trickling down through the name service switch and opening /etc/mdns.allow, which the AppArmor profile in the chrony package does not allow.
Fixes: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/1869629
Signed-off-by: John Johansen <john.johansen@canonical.com>
(cherry picked from commit eeac8c11c9)
15 lines
457 B
Plaintext
15 lines
457 B
Plaintext
# ------------------------------------------------------------------
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#
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# Copyright (C) 2002-2006 Novell/SUSE
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of version 2 of the GNU General Public
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# License published by the Free Software Foundation.
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#
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# ------------------------------------------------------------------
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# mdnsd
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/etc/mdns.allow r,
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/etc/nss_mdns.conf r,
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/{,var/}run/mdnsd w,
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