mirror of
https://gitlab.com/apparmor/apparmor.git
synced 2025-03-04 08:24:42 +01:00
1c2d79de7f
... in aa-teardown (actually everything that uses rc.apparmor.functions) and aa-remove-unknown. Fixes: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/2093797
339 lines
9 KiB
Bash
339 lines
9 KiB
Bash
#!/bin/sh
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# ----------------------------------------------------------------------
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# Copyright (c) 1999-2008 NOVELL (All rights reserved)
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# Copyright (c) 2009-2018 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, contact Novell, Inc.
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# ----------------------------------------------------------------------
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# rc.apparmor.functions by Steve Beattie
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#
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# NOTE: rc.apparmor initscripts that source this file need to implement
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# the following set of functions:
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# aa_action
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# aa_log_action_start
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# aa_log_action_end
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# aa_log_success_msg
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# aa_log_warning_msg
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# aa_log_failure_msg
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# aa_log_skipped_msg
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# aa_log_daemon_msg
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# aa_log_end_msg
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# Some nice defines that we use
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PARSER=/sbin/apparmor_parser
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PARSER_OPTS=
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# Suppress warnings when booting in quiet mode
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if [ "${QUIET:-no}" = yes ] || [ "${quiet:-n}" = y ]; then
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PARSER_OPTS="$PARSER_OPTS --quiet"
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fi
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if [ -d /etc/apparmor.d ] ; then
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PROFILE_DIRS=/etc/apparmor.d
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else
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aa_log_warning_msg "Unable to find profiles directory, installation problem?"
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fi
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# Eg. snapd policy might need this on some systems if loading policy
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# during early boot if not using the snapd unit file
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ADDITIONAL_PROFILE_DIR=
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if [ -n "$ADDITIONAL_PROFILE_DIR" ] && [ -d "$ADDITIONAL_PROFILE_DIR" ]; then
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PROFILE_DIRS="$PROFILE_DIRS $ADDITIONAL_PROFILE_DIR"
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fi
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AA_STATUS=/usr/sbin/aa-status
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SECURITYFS=/sys/kernel/security
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SFS_MOUNTPOINT="${SECURITYFS}/apparmor"
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# keep exit status from parser during profile load. 0 is good, 1 is bad
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STATUS=0
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# Test if the apparmor "module" is present.
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is_apparmor_present() {
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[ -d /sys/module/apparmor ]
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}
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# Checks to see if the current container is capable of having internal AppArmor
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# profiles that should be loaded. Callers of this function should have already
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# verified that they're running inside of a container environment with
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# something like `systemd-detect-virt --container`.
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#
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# The only known container environments capable of supporting internal policy
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# are LXD and LXC environments, and Windows Subsystem for Linux.
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#
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# Returns 0 if the container environment is capable of having its own internal
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# policy and non-zero otherwise.
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#
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# IMPORTANT: This function will return 0 in the case of a non-LXD/non-LXC
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# system container technology being nested inside of a LXD/LXC container that
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# utilized an AppArmor namespace and profile stacking. The reason 0 will be
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# returned is because .ns_stacked will be "yes" and .ns_name will still match
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# "lx[dc]-*" since the nested system container technology will not have set up
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# a new AppArmor profile namespace. This will result in the nested system
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# container's boot process to experience failed policy loads but the boot
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# process should continue without any loss of functionality. This is an
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# unsupported configuration that cannot be properly handled by this function.
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is_container_with_internal_policy() {
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# this function is sometimes called independently of
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# is_apparmor_loaded(), so also define this here.
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local ns_stacked_path="${SFS_MOUNTPOINT}/.ns_stacked"
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local ns_name_path="${SFS_MOUNTPOINT}/.ns_name"
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local ns_stacked
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local ns_name
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# WSL needs to be detected explicitly
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if [ -x /usr/bin/systemd-detect-virt ] && \
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[ "$(systemd-detect-virt --container)" = "wsl" ]; then
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return 0
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fi
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if ! [ -f "$ns_stacked_path" ] || ! [ -f "$ns_name_path" ]; then
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return 1
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fi
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read -r ns_stacked < "$ns_stacked_path"
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if [ "$ns_stacked" != "yes" ]; then
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return 1
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fi
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# LXD, Incus and LXC set up AppArmor namespaces starting with "lxd-",
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# "incus-" and "lxc-", respectively. Return non-zero for all other
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# namespace identifiers.
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read -r ns_name < "$ns_name_path"
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if [ "${ns_name#lxd-*}" = "$ns_name" ] && \
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[ "${ns_name#incus-*}" = "$ns_name" ] && \
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[ "${ns_name#lxc-*}" = "$ns_name" ]; then
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return 1
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fi
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return 0
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}
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__parse_profiles_dir() {
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local parser_cmd="$1"
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local profile_dir="$2"
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local status=0
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if [ ! -d "$profile_dir" ]; then
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aa_log_failure_msg "Profile directory not found: $profile_dir"
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return 1
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fi
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if [ -z "$(ls "$profile_dir"/)" ]; then
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aa_log_failure_msg "No profiles found in $profile_dir"
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return 1
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fi
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# shellcheck disable=SC2086
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if ! "$PARSER" $PARSER_OPTS "$parser_cmd" -- "$profile_dir"; then
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status=1
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aa_log_failure_msg "At least one profile failed to load"
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fi
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return "$status"
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}
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parse_profiles() {
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# get parser arg
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case "$1" in
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load)
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PARSER_CMD="--add"
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PARSER_MSG="Loading AppArmor profiles "
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;;
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reload)
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PARSER_CMD="--replace"
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PARSER_MSG="Reloading AppArmor profiles "
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;;
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*)
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aa_log_failure_msg "required 'load' or 'reload'"
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exit 1
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;;
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esac
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aa_log_action_start "$PARSER_MSG"
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# run the parser on all of the apparmor profiles
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if [ ! -f "$PARSER" ]; then
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aa_log_failure_msg "AppArmor parser not found"
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exit 1
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fi
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for profile_dir in $PROFILE_DIRS; do
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__parse_profiles_dir "$PARSER_CMD" "$profile_dir" || STATUS=$?
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done
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aa_log_action_end "$STATUS"
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return "$STATUS"
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}
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is_apparmor_loaded() {
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if ! is_securityfs_mounted ; then
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mount_securityfs
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fi
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if [ -f "${SFS_MOUNTPOINT}/profiles" ]; then
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return 0
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fi
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is_apparmor_present
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return $?
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}
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is_securityfs_mounted() {
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test -d "$SECURITYFS" -a -d /sys/fs/cgroup/systemd || grep -q securityfs /proc/filesystems && grep -q securityfs /proc/mounts
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return $?
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}
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mount_securityfs() {
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if grep -q securityfs /proc/filesystems ; then
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aa_action "Mounting securityfs on $SECURITYFS" \
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mount -t securityfs securityfs "$SECURITYFS"
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return $?
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fi
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return 0
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}
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apparmor_start() {
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aa_log_daemon_msg "Starting AppArmor"
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if ! is_apparmor_present ; then
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aa_log_failure_msg "Starting AppArmor - failed, To enable AppArmor, ensure your kernel is configured with CONFIG_SECURITY_APPARMOR=y then add 'security=apparmor apparmor=1' to the kernel command line"
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aa_log_end_msg 1
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return 1
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elif ! is_apparmor_loaded ; then
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aa_log_failure_msg "Starting AppArmor - AppArmor control files aren't available under /sys/kernel/security/, please make sure securityfs is mounted."
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aa_log_end_msg 1
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return 1
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fi
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if [ ! -w "$SFS_MOUNTPOINT/.load" ] ; then
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aa_log_failure_msg "Loading AppArmor profiles - failed, Do you have the correct privileges?"
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aa_log_end_msg 1
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return 1
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fi
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# if there is anything in the profiles file don't load
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if ! read -r _ < "$SFS_MOUNTPOINT/profiles"; then
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parse_profiles load
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else
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aa_log_skipped_msg ": already loaded with profiles."
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return 0
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fi
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aa_log_end_msg 0
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return 0
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}
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remove_profiles() {
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# removing profiles as we directly read from apparmorfs
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# doesn't work, since we are removing entries which screws up
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# our position. Lets hope there are never enough profiles to
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# overflow the variable
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if ! is_apparmor_loaded ; then
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aa_log_failure_msg "AppArmor module is not loaded"
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return 1
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fi
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if [ ! -w "$SFS_MOUNTPOINT/.remove" ] ; then
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aa_log_failure_msg "Root privileges not available"
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return 1
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fi
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if [ ! -x "$PARSER" ] ; then
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aa_log_failure_msg "Unable to execute AppArmor parser"
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return 1
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fi
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retval=0
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# We filter child profiles as removing the parent will remove
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# the children
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sed -e "s/ (\(enforce\|complain\|prompt\|kill\|unconfined\))$//" "$SFS_MOUNTPOINT/profiles" | \
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LC_COLLATE=C sort | grep -v // | {
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while read -r profile ; do
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printf "%s" "$profile" > "$SFS_MOUNTPOINT/.remove"
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rc=$?
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if [ "$rc" -ne 0 ] ; then
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retval=$rc
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aa_log_failure_msg "Unloading profile '$profile' failed"
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fi
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done
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return "$retval"
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}
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}
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apparmor_stop() {
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aa_log_daemon_msg "Unloading AppArmor profiles"
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remove_profiles
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rc=$?
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aa_log_end_msg "$rc"
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return "$rc"
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}
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apparmor_kill() {
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if ! is_apparmor_loaded ; then
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aa_log_failure_msg "AppArmor module is not loaded"
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return 1
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fi
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aa_log_failure_msg "apparmor_kill() is no longer supported because AppArmor can't be built as a module"
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return 1
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}
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__apparmor_restart() {
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if [ ! -w "$SFS_MOUNTPOINT/.load" ] ; then
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aa_log_failure_msg "Loading AppArmor profiles - failed, Do you have the correct privileges?"
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return 4
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fi
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aa_log_daemon_msg "Restarting AppArmor"
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parse_profiles reload
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rc=$?
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aa_log_end_msg "$rc"
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return "$rc"
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}
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apparmor_restart() {
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if ! is_apparmor_loaded ; then
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apparmor_start
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rc=$?
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return "$rc"
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fi
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__apparmor_restart
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return $?
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}
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apparmor_try_restart() {
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if ! is_apparmor_loaded ; then
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return 0
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fi
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__apparmor_restart
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return $?
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}
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apparmor_status () {
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if test -x "$AA_STATUS" ; then
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"$AA_STATUS" --verbose
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return $?
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fi
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if ! is_apparmor_loaded ; then
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echo "AppArmor is not loaded."
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rc=1
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else
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echo "AppArmor is enabled."
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rc=0
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fi
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echo "Install the apparmor-utils package to receive more detailed"
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echo "status information here (or examine $SFS_MOUNTPOINT directly)."
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return "$rc"
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}
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