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(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 }