mirror of
https://gitlab.com/apparmor/apparmor.git
synced 2025-03-04 16:35:02 +01:00
775835db64
Commit 0d5ab43d59 removed support for loading
modules and introduced a caller, in apparmor_start(), that passes no argument to
is_apparmor_present(), which breaks that function when /bin/sh → /bin/dash.
Passing a module name as argument does not make sense since we dropped support
for the long obsolete "subdomain" module, so let's simplify
is_apparmor_present() and adjust its callers accordingly.
Bug-Debian: https://bugs.debian.org/917874
431 lines
11 KiB
Bash
431 lines
11 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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MODULE=apparmor
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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="$PARSER_OPTS --quiet"
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fi
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if [ -d /etc/apparmor.d ] ; then
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PROFILE_DIRS=/etc/apparmor.d
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else
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aa_log_warning_msg "Unable to find profiles directory, installation problem?"
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fi
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ADDITIONAL_PROFILE_DIR=/var/lib/snapd/apparmor/profiles
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if [ -d "$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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# 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 environment.
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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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local ns_stacked_path="${SFS_MOUNTPOINT}/.ns_stacked"
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local ns_name_path="${SFS_MOUNTPOINT}/.ns_name"
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local ns_stacked
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local ns_name
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if ! [ -f "$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 [ "$ns_stacked" != "yes" ]; then
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return 1
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fi
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# LXD and LXC set up AppArmor namespaces starting with "lxd-" and
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# "lxc-", respectively. Return non-zero for all other namespace
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# identifiers.
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read -r ns_name < "$ns_name_path"
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if [ "${ns_name#lxd-*}" = "$ns_name" ] && \
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[ "${ns_name#lxc-*}" = "$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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# This set of patterns to skip needs to be kept in sync with
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# AppArmor.pm::isSkippableFile()
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# returns 0 if profile should NOT be skipped
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# returns 1 on verbose skip
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# returns 2 on silent skip
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skip_profile() {
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local profile=$1
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if [ "${profile%.rpmnew}" != "${profile}" -o \
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"${profile%.rpmsave}" != "${profile}" -o \
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"${profile%.orig}" != "${profile}" -o \
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"${profile%.rej}" != "${profile}" -o \
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"${profile%\~}" != "${profile}" ] ; then
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return 1
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fi
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# Silently ignore the dpkg, pacman, and xbps files
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if [ "${profile%.dpkg-new}" != "${profile}" -o \
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"${profile%.dpkg-old}" != "${profile}" -o \
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"${profile%.dpkg-dist}" != "${profile}" -o \
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"${profile%.dpkg-bak}" != "${profile}" -o \
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"${profile%.dpkg-remove}" != "${profile}" -o \
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"${profile%.pacsave}" != "${profile}" -o \
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"${profile%.pacnew}" != "${profile}" ] ; then
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return 2
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fi
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if echo "${profile}" | egrep -q '^.+\.new-[0-9\.]+_[0-9]+$'; then
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return 2
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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 $profile_dir"
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return 1
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fi
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# Note: the parser automatically skips files that match skip_profile()
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# when we pass it a directory, but not when we pass it an individual
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# profile. So we need to use skip_profile only in the latter case,
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# as long as the parser is in sync' with skip_profile().
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"$PARSER" $PARSER_OPTS $parser_cmd -- "$profile_dir" || {
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# FIXME: once the parser properly handles broken profiles
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# (LP: #1377338), remove the following code and the
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# skip_profile() function. For now, if the parser returns
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# an error, just run it again separately on each profile.
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for profile in $profile_dir/*; do
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skip_profile "${profile}"
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skip=$?
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if [ "$skip" -eq 2 ]; then
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# Ignore skip status == 2 (silent skip)
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continue
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elif [ "$skip" -ne 0 ] ; then
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aa_log_skipped_msg "$profile"
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logger -t "AppArmor(init)" -p daemon.warn \
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"Skipping profile $profile"
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continue
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fi
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if [ ! -f "${profile}" ] ; then
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continue
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fi
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echo "$profile"
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done | \
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# Use xargs to parallelize calls to the parser over all CPUs
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xargs -n1 -d"\n" --max-procs=$(getconf _NPROCESSORS_ONLN) \
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"$PARSER" $PARSER_OPTS $parser_cmd --
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if [ $? -ne 0 ]; 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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}
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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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aa_log_action_end 1
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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 $STATUS
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}
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profiles_names_list() {
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# run the parser on all of the apparmor profiles
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if [ ! -f "$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 $PROFILE_DIRS; do
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if [ ! -d "$profile_dir" ]; then
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aa_log_warning_msg "- Profile directory not found: $profile_dir"
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continue
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fi
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for profile in $profile_dir/*; do
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if skip_profile "${profile}" && [ -f "${profile}" ] ; then
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LIST_ADD=$($PARSER -N "$profile" )
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if [ $? -eq 0 ]; then
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echo "$LIST_ADD"
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fi
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fi
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done
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done
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}
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failstop_system() {
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level=$(runlevel | cut -d" " -f2)
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if [ $level -ne "1" ] ; then
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aa_log_failure_msg "- could not start AppArmor. Changing to runlevel 1"
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telinit 1;
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return 255;
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fi
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aa_log_failure_msg "- could not start AppArmor."
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return 255
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}
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is_apparmor_loaded() {
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if ! is_securityfs_mounted ; then
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mount_securityfs
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fi
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if [ -f "${SECURITYFS}/${MODULE}/profiles" ]; then
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SFS_MOUNTPOINT="${SECURITYFS}/${MODULE}"
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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 line < "$SFS_MOUNTPOINT/profiles"; then
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parse_profiles load
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else
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aa_log_skipped_msg ": already loaded with profiles."
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return 0
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fi
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aa_log_end_msg 0
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return 0
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}
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remove_profiles() {
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# removing profiles as we directly read from apparmorfs
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# doesn't work, since we are removing entries which screws up
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# our position. Lets hope there are never enough profiles to
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# overflow the variable
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if ! is_apparmor_loaded ; then
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aa_log_failure_msg "AppArmor module is not loaded"
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return 1
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fi
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if [ ! -w "$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/ (\(enforce\|complain\))$//" "$SFS_MOUNTPOINT/profiles" | \
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LC_COLLATE=C sort | grep -v // | while read profile ; do
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echo -n "$profile" > "$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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fi
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done
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return ${retval}
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}
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apparmor_stop() {
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aa_log_daemon_msg "Unloading AppArmor profiles "
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remove_profiles
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rc=$?
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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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aa_log_daemon_msg "Unloading AppArmor modules "
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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 is_apparmor_present ; then
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MODULE=apparmor
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else
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aa_log_failure_msg "AppArmor is builtin"
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return 1
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fi
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/sbin/modprobe -qr $MODULE
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rc=$?
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aa_log_end_msg $rc
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return $rc
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}
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__apparmor_restart() {
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if [ ! -w "$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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