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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: ${progname} [options] Remove profiles unknown to the system Options: -h, --help Show this help message and exit -n Dry run; don't remove profiles" if [ "$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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