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#!/bin/sh
# ----------------------------------------------------------------------
# Copyright (c) 2017 Canonical Ltd. (All rights reserved)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# ----------------------------------------------------------------------
APPARMOR_FUNCTIONS=/lib/apparmor/functions
APPARMORFS=/sys/kernel/security/apparmor
PROFILES_IFACE="${APPARMORFS}/profiles"
REMOVE="${APPARMORFS}/.remove"
DRY_RUN=0
. $APPARMOR_FUNCTIONS
usage() {
local progname="$1"
local rc="$2"
local msg="usage: ${progname} [options]\n
Remove profiles unknown to the system
Options:
-h, --help Show this help message and exit
-n Dry run; don't remove profiles"
if [ "$rc" -ne 0 ] ; then
echo "$msg" 1>&2
else
echo "$msg"
fi
exit "$rc"
}
if [ "$#" -gt 1 ] ; then
usage "$0" 1
elif [ "$#" -eq 1 ] ; then
if [ "$1" = "-h" -o "$1" = "--help" ] ; then
usage "$0" 0
elif [ "$1" = "-n" ] ; then
DRY_RUN=1
else
usage "$0" 1
fi
fi
# We can't use a -r test here because while $PROFILES_IFACE is world-readable,
# apparmorfs may still return EACCES from open()
#
# We have to do this check because error checking awk's getline() below is
# tricky and, as is, results in an infinite loop when apparmorfs returns an
# error from open().
if ! IFS= read line < "$PROFILES_IFACE" ; then
echo "ERROR: Unable to read apparmorfs profiles file" 1>&2
exit 1
elif [ ! -w "$REMOVE" ] ; then
echo "ERROR: Unable to write to apparmorfs remove file" 1>&2
exit 1
fi
# Clean out running profiles not associated with the current profile
# set, excluding the libvirt dynamically generated profiles.
aa_configured=$(mktemp -t aa-XXXXXX)
configured_profile_names > "$aa_configured"
if [ "$?" -ne 0 ] ; then
echo "ERROR: Unable to enumerate the known profiles" 1>&2
rm -f "$aa_configured" "$aa_loaded"
exit 1
fi
aa_loaded=$(mktemp -t aa-XXXXXX)
running_profile_names > "$aa_loaded" || true
if [ "$?" -ne 0 ] ; then
echo "ERROR: Unable to enumerate the running profiles" 1>&2
rm -f "$aa_configured" "$aa_loaded"
exit 1
fi
LC_COLLATE=C comm -2 -3 "$aa_loaded" "$aa_configured" | while read profile ; do
if [ "$DRY_RUN" -ne 0 ]; then
echo "Would remove '${profile}'"
else
echo "Removing '${profile}'"
unload_profile "$profile"
fi
done
ret="$?"
rm -f "$aa_configured" "$aa_loaded"
# will not catch all errors, but still better than nothing
exit $ret
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