mirror of
https://gitlab.com/apparmor/apparmor.git
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b4aa00de51
This check is intended for ensuring that the profiles file can actually be opened. The *actual* check is performed by the shell, not the read utility, which won't even be executed if the input redirection (and hence the test) fails. If the test succeeds, though, using `read` here might actually jeopardize the test result if there are no profiles loaded and the file is empty. This commit fixes that case by simply using `true` instead of `read`.
117 lines
3.1 KiB
Bash
Executable file
117 lines
3.1 KiB
Bash
Executable file
#!/bin/sh
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# ----------------------------------------------------------------------
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# Copyright (c) 2017 Canonical Ltd. (All rights reserved)
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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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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# ----------------------------------------------------------------------
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APPARMOR_FUNCTIONS=/lib/apparmor/rc.apparmor.functions
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APPARMORFS=/sys/kernel/security/apparmor
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PROFILES="${APPARMORFS}/profiles"
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REMOVE="${APPARMORFS}/.remove"
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DRY_RUN=0
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. $APPARMOR_FUNCTIONS
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usage() {
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local progname="$0"
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local rc="$1"
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local msg="usage: ${progname} [options]
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Remove profiles unknown to the system
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Options:
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-h, --help Show this help message and exit
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-n Dry run; don't remove profiles"
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if [ "$rc" -ne 0 ] ; then
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echo "$msg" 1>&2
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else
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echo "$msg"
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fi
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exit "$rc"
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}
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if [ "$#" -gt 1 ] ; then
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usage 1
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elif [ "$#" -eq 1 ] ; then
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if [ "$1" = "-h" ] || [ "$1" = "--help" ] ; then
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usage 0
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elif [ "$1" = "-n" ] ; then
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DRY_RUN=1
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else
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usage 1
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fi
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fi
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# We can't use a -r test here because while $PROFILES is world-readable,
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# apparmorfs may still return EACCES from open()
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#
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# We have to do this check because error checking awk's getline() below is
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# tricky and, as is, results in an infinite loop when apparmorfs returns an
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# error from open().
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if ! true < "$PROFILES" ; then
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echo "ERROR: Unable to read apparmorfs profiles file" 1>&2
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exit 1
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elif [ ! -w "$REMOVE" ] ; then
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echo "ERROR: Unable to write to apparmorfs remove file" 1>&2
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exit 1
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fi
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# Clean out running profiles not associated with the current profile
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# set, excluding the libvirt dynamically generated profiles.
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# Note that we reverse sort the list of profiles to remove to
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# ensure that child profiles (e.g. hats) are removed before the
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# parent. We *do* need to remove the child profile and not rely
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# on removing the parent profile when the profile has had its
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# child profile names changed.
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# shellcheck disable=SC2086
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LOADED_PROFILES=$("$PARSER" -N $PROFILE_DIRS) || {
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ret=$?
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echo 'apparmor_parser exited with failure, aborting.' >&2
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exit $ret
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}
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echo "$LOADED_PROFILES" | awk '
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BEGIN {
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while (getline < "'${PROFILES}'" ) {
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sub(/ \((enforce|complain|unconfined)\)$/, "", $0);
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if (match($0, /^libvirt-[0-9a-f\-]+$/) == 0)
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arr[$0] = $0
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}
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}
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{ if (length(arr[$0]) > 0) { delete arr[$0] } }
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END {
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for (key in arr)
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if (length(arr[key]) > 0) {
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printf("%s\n", arr[key])
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}
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}
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' | LC_COLLATE=C sort -r | \
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while IFS= read -r profile ; do
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if [ "$DRY_RUN" -ne 0 ]; then
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echo "Would remove '${profile}'"
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else
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echo "Removing '${profile}'"
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echo -n "$profile" > "${REMOVE}"
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fi
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done
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# will not catch all errors, but still better than nothing
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exit $?
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