Current File : //snap/core20/2379/lib/apparmor/rc.apparmor.functions
#!/bin/sh
# ----------------------------------------------------------------------
# Copyright (c) 1999-2008 NOVELL (All rights reserved)
# Copyright (c) 2009-2018 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, contact Novell, Inc.
# ----------------------------------------------------------------------
# rc.apparmor.functions by Steve Beattie
#
# NOTE: rc.apparmor initscripts that source this file need to implement
# the following set of functions:
# aa_action
# aa_log_action_start
# aa_log_action_end
# aa_log_success_msg
# aa_log_warning_msg
# aa_log_failure_msg
# aa_log_skipped_msg
# aa_log_daemon_msg
# aa_log_end_msg
# Some nice defines that we use
MODULE=apparmor
PARSER=/sbin/apparmor_parser
PARSER_OPTS=--write-cache
# Suppress warnings when booting in quiet mode
if [ "${QUIET:-no}" = yes ] || [ "${quiet:-n}" = y ]; then
PARSER_OPTS="$PARSER_OPTS --quiet"
fi
if [ -d /etc/apparmor.d ] ; then
PROFILE_DIRS=/etc/apparmor.d
else
aa_log_warning_msg "Unable to find profiles directory, installation problem?"
fi
ADDITIONAL_PROFILE_DIR=
if [ -n "$ADDITIONAL_PROFILE_DIR" ] && [ -d "$ADDITIONAL_PROFILE_DIR" ]; then
PROFILE_DIRS="${PROFILE_DIRS} ${ADDITIONAL_PROFILE_DIR}"
fi
AA_STATUS=/usr/sbin/aa-status
SECURITYFS=/sys/kernel/security
# keep exit status from parser during profile load. 0 is good, 1 is bad
STATUS=0
# Test if the apparmor "module" is present.
is_apparmor_present() {
[ -d /sys/module/apparmor ]
}
# Checks to see if the current container is capable of having internal AppArmor
# profiles that should be loaded. Callers of this function should have already
# verified that they're running inside of a container environment with
# something like `systemd-detect-virt --container`.
#
# The only known container environments capable of supporting internal policy
# are LXD and LXC environment.
#
# Returns 0 if the container environment is capable of having its own internal
# policy and non-zero otherwise.
#
# IMPORTANT: This function will return 0 in the case of a non-LXD/non-LXC
# system container technology being nested inside of a LXD/LXC container that
# utilized an AppArmor namespace and profile stacking. The reason 0 will be
# returned is because .ns_stacked will be "yes" and .ns_name will still match
# "lx[dc]-*" since the nested system container technology will not have set up
# a new AppArmor profile namespace. This will result in the nested system
# container's boot process to experience failed policy loads but the boot
# process should continue without any loss of functionality. This is an
# unsupported configuration that cannot be properly handled by this function.
is_container_with_internal_policy() {
# this function is sometimes called independently of
# is_apparmor_loaded(), so define this here.
SFS_MOUNTPOINT="${SECURITYFS}/${MODULE}"
local ns_stacked_path="${SFS_MOUNTPOINT}/.ns_stacked"
local ns_name_path="${SFS_MOUNTPOINT}/.ns_name"
local ns_stacked
local ns_name
if ! [ -f "$ns_stacked_path" ] || ! [ -f "$ns_name_path" ]; then
return 1
fi
read -r ns_stacked < "$ns_stacked_path"
if [ "$ns_stacked" != "yes" ]; then
return 1
fi
# LXD and LXC set up AppArmor namespaces starting with "lxd-" and
# "lxc-", respectively. Return non-zero for all other namespace
# identifiers.
read -r ns_name < "$ns_name_path"
if [ "${ns_name#lxd-*}" = "$ns_name" ] && \
[ "${ns_name#lxc-*}" = "$ns_name" ]; then
return 1
fi
return 0
}
# This set of patterns to skip needs to be kept in sync with
# AppArmor.pm::isSkippableFile()
# returns 0 if profile should NOT be skipped
# returns 1 on verbose skip
# returns 2 on silent skip
skip_profile() {
local profile=$1
if [ "${profile%.rpmnew}" != "${profile}" -o \
"${profile%.rpmsave}" != "${profile}" -o \
"${profile%.orig}" != "${profile}" -o \
"${profile%.rej}" != "${profile}" -o \
"${profile%\~}" != "${profile}" ] ; then
return 1
fi
# Silently ignore the dpkg, pacman, and xbps files
if [ "${profile%.dpkg-new}" != "${profile}" -o \
"${profile%.dpkg-old}" != "${profile}" -o \
"${profile%.dpkg-dist}" != "${profile}" -o \
"${profile%.dpkg-bak}" != "${profile}" -o \
"${profile%.dpkg-remove}" != "${profile}" -o \
"${profile%.pacsave}" != "${profile}" -o \
"${profile%.pacnew}" != "${profile}" ] ; then
return 2
fi
if echo "${profile}" | egrep -q '^.+\.new-[0-9\.]+_[0-9]+$'; then
return 2
fi
return 0
}
__parse_profiles_dir() {
local parser_cmd="$1"
local profile_dir="$2"
local status=0
if [ ! -d "$profile_dir" ]; then
aa_log_failure_msg "Profile directory not found: $profile_dir"
return 1
fi
if [ -z "$(ls $profile_dir/)" ]; then
aa_log_failure_msg "No profiles found in $profile_dir"
return 1
fi
# Note: the parser automatically skips files that match skip_profile()
# when we pass it a directory, but not when we pass it an individual
# profile. So we need to use skip_profile only in the latter case,
# as long as the parser is in sync' with skip_profile().
"$PARSER" $PARSER_OPTS $parser_cmd -- "$profile_dir" || {
# FIXME: once the parser properly handles broken profiles
# (LP: #1377338), remove the following code and the
# skip_profile() function. For now, if the parser returns
# an error, just run it again separately on each profile.
for profile in $profile_dir/*; do
skip_profile "${profile}"
skip=$?
if [ "$skip" -eq 2 ]; then
# Ignore skip status == 2 (silent skip)
continue
elif [ "$skip" -ne 0 ] ; then
aa_log_skipped_msg "$profile"
logger -t "AppArmor(init)" -p daemon.warn \
"Skipping profile $profile"
continue
fi
if [ ! -f "${profile}" ] ; then
continue
fi
echo "$profile"
done | \
# Use xargs to parallelize calls to the parser over all CPUs
xargs -n1 -d"\n" --max-procs=$(getconf _NPROCESSORS_ONLN) \
"$PARSER" $PARSER_OPTS $parser_cmd --
if [ $? -ne 0 ]; then
status=1
aa_log_failure_msg "At least one profile failed to load"
fi
}
return $status
}
parse_profiles() {
# get parser arg
case "$1" in
load)
PARSER_CMD="--add"
PARSER_MSG="Loading AppArmor profiles "
;;
reload)
PARSER_CMD="--replace"
PARSER_MSG="Reloading AppArmor profiles "
;;
*)
aa_log_failure_msg "required 'load' or 'reload'"
exit 1
;;
esac
aa_log_action_start "$PARSER_MSG"
# run the parser on all of the apparmor profiles
if [ ! -f "$PARSER" ]; then
aa_log_failure_msg "AppArmor parser not found"
aa_log_action_end 1
exit 1
fi
for profile_dir in $PROFILE_DIRS; do
__parse_profiles_dir "$PARSER_CMD" "$profile_dir" || STATUS=$?
done
aa_log_action_end "$STATUS"
return $STATUS
}
profiles_names_list() {
# run the parser on all of the apparmor profiles
if [ ! -f "$PARSER" ]; then
aa_log_failure_msg "- AppArmor parser not found"
exit 1
fi
for profile_dir in $PROFILE_DIRS; do
if [ ! -d "$profile_dir" ]; then
aa_log_warning_msg "- Profile directory not found: $profile_dir"
continue
fi
for profile in $profile_dir/*; do
if skip_profile "${profile}" && [ -f "${profile}" ] ; then
LIST_ADD=$($PARSER -N "$profile" )
if [ $? -eq 0 ]; then
echo "$LIST_ADD"
fi
fi
done
done
}
failstop_system() {
level=$(runlevel | cut -d" " -f2)
if [ $level -ne "1" ] ; then
aa_log_failure_msg "- could not start AppArmor. Changing to runlevel 1"
telinit 1;
return -1;
fi
aa_log_failure_msg "- could not start AppArmor."
return -1
}
is_apparmor_loaded() {
if ! is_securityfs_mounted ; then
mount_securityfs
fi
if [ -f "${SECURITYFS}/${MODULE}/profiles" ]; then
SFS_MOUNTPOINT="${SECURITYFS}/${MODULE}"
return 0
fi
is_apparmor_present
return $?
}
is_securityfs_mounted() {
test -d ${SECURITYFS} -a -d /sys/fs/cgroup/systemd || grep -q securityfs /proc/filesystems && grep -q securityfs /proc/mounts
return $?
}
mount_securityfs() {
if grep -q securityfs /proc/filesystems ; then
aa_action "Mounting securityfs on ${SECURITYFS}" \
mount -t securityfs securityfs "${SECURITYFS}"
return $?
fi
return 0
}
apparmor_start() {
aa_log_daemon_msg "Starting AppArmor"
if ! is_apparmor_present ; then
aa_log_failure_msg "Starting AppArmor - failed, To enable AppArmor, ensure your kernel is configured with CONFIG_SECURITY_APPARMOR=y then add 'security=apparmor apparmor=1' to the kernel command line"
aa_log_end_msg 1
return 1
elif ! is_apparmor_loaded ; then
aa_log_failure_msg "Starting AppArmor - AppArmor control files aren't available under /sys/kernel/security/, please make sure securityfs is mounted."
aa_log_end_msg 1
return 1
fi
if [ ! -w "$SFS_MOUNTPOINT/.load" ] ; then
aa_log_failure_msg "Loading AppArmor profiles - failed, Do you have the correct privileges?"
aa_log_end_msg 1
return 1
fi
# if there is anything in the profiles file don't load
if ! read line < "$SFS_MOUNTPOINT/profiles"; then
parse_profiles load
else
aa_log_skipped_msg ": already loaded with profiles."
return 0
fi
aa_log_end_msg 0
return 0
}
remove_profiles() {
# removing profiles as we directly read from apparmorfs
# doesn't work, since we are removing entries which screws up
# our position. Lets hope there are never enough profiles to
# overflow the variable
if ! is_apparmor_loaded ; then
aa_log_failure_msg "AppArmor module is not loaded"
return 1
fi
if [ ! -w "$SFS_MOUNTPOINT/.remove" ] ; then
aa_log_failure_msg "Root privileges not available"
return 1
fi
if [ ! -x "${PARSER}" ] ; then
aa_log_failure_msg "Unable to execute AppArmor parser"
return 1
fi
retval=0
# We filter child profiles as removing the parent will remove
# the children
sed -e "s/ (\(enforce\|complain\))$//" "$SFS_MOUNTPOINT/profiles" | \
LC_COLLATE=C sort | grep -v // | {
while read profile ; do
echo -n "$profile" > "$SFS_MOUNTPOINT/.remove"
rc=$?
if [ ${rc} -ne 0 ] ; then
retval=${rc}
fi
done
return ${retval}
}
}
apparmor_stop() {
aa_log_daemon_msg "Unloading AppArmor profiles "
remove_profiles
rc=$?
aa_log_end_msg $rc
return $rc
}
apparmor_kill() {
aa_log_daemon_msg "Unloading AppArmor modules "
if ! is_apparmor_loaded ; then
aa_log_failure_msg "AppArmor module is not loaded"
return 1
fi
if is_apparmor_present ; then
MODULE=apparmor
else
aa_log_failure_msg "AppArmor is builtin"
return 1
fi
/sbin/modprobe -qr $MODULE
rc=$?
aa_log_end_msg $rc
return $rc
}
__apparmor_restart() {
if [ ! -w "$SFS_MOUNTPOINT/.load" ] ; then
aa_log_failure_msg "Loading AppArmor profiles - failed, Do you have the correct privileges?"
return 4
fi
aa_log_daemon_msg "Restarting AppArmor"
parse_profiles reload
rc=$?
aa_log_end_msg $rc
return $rc
}
apparmor_restart() {
if ! is_apparmor_loaded ; then
apparmor_start
rc=$?
return $rc
fi
__apparmor_restart
return $?
}
apparmor_try_restart() {
if ! is_apparmor_loaded ; then
return 0
fi
__apparmor_restart
return $?
}
apparmor_status () {
if test -x ${AA_STATUS} ; then
${AA_STATUS} --verbose
return $?
fi
if ! is_apparmor_loaded ; then
echo "AppArmor is not loaded."
rc=1
else
echo "AppArmor is enabled."
rc=0
fi
echo "Install the apparmor-utils package to receive more detailed"
echo "status information here (or examine ${SFS_MOUNTPOINT} directly)."
return $rc
}
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