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Diffstat (limited to 'recipes-mac/AppArmor/files/functions')
| -rw-r--r-- | recipes-mac/AppArmor/files/functions | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/recipes-mac/AppArmor/files/functions b/recipes-mac/AppArmor/files/functions new file mode 100644 index 0000000..cef8cfe --- /dev/null +++ b/recipes-mac/AppArmor/files/functions @@ -0,0 +1,271 @@ +# /lib/apparmor/functions for Debian -*- shell-script -*- +# ---------------------------------------------------------------------- +# Copyright (c) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 +# NOVELL (All rights reserved) +# Copyright (c) 2008-2010 Canonical, Ltd. +# +# 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. +# ---------------------------------------------------------------------- +# Authors: +# Kees Cook <kees@ubuntu.com> + +PROFILES="/etc/apparmor.d" +PROFILES_CACHE="$PROFILES/cache" +PROFILES_VAR="/var/lib/apparmor/profiles" +PROFILES_SNAPPY="/var/lib/snapd/apparmor/profiles" +PROFILES_CACHE_VAR="/var/cache/apparmor" +PARSER="/sbin/apparmor_parser" +SECURITYFS="/sys/kernel/security" +export AA_SFS="$SECURITYFS/apparmor" + +# Suppress warnings when booting in quiet mode +quiet_arg="" +[ "${QUIET:-no}" = yes ] && quiet_arg="-q" +[ "${quiet:-n}" = y ] && quiet_arg="-q" + +foreach_configured_profile() { + rc_all="0" + for pdir in "$PROFILES" "$PROFILES_VAR" "$PROFILES_SNAPPY" ; do + if [ ! -d "$pdir" ]; then + continue + fi + num=`find "$pdir" -type f ! -name '*.md5sums' | wc -l` + if [ "$num" = "0" ]; then + continue + fi + + cache_dir="$PROFILES_CACHE" + if [ -d "$PROFILES_CACHE_VAR" ] && [ "$pdir" = "$PROFILES_VAR" ] || [ "$pdir" = "$PROFILES_SNAPPY" ]; then + cache_dir="$PROFILES_CACHE_VAR" + fi + cache_args="--cache-loc=$cache_dir" + if [ ! -d "$cache_dir" ]; then + cache_args= + fi + + # LP: #1383858 - expr tree simplification is too slow for + # Touch policy on ARM, so disable it for now + cache_extra_args= + if [ -d "$PROFILES_CACHE_VAR" ] && [ "$pdir" = "$PROFILES_VAR" ] || [ "$pdir" = "$PROFILES_SNAPPY" ]; then + cache_extra_args="-O no-expr-simplify" + fi + + # If need to compile everything, then use -n1 with xargs to + # take advantage of -P. When cache files are in use, omit -n1 + # since it is considerably faster on moderately sized profile + # sets to give the parser all the profiles to load at once + n1_args= + num=`find "$cache_dir" -type f ! -name '.features' | wc -l` + if [ "$num" = "0" ]; then + n1_args="-n1" + fi + + (ls -1 "$pdir" | egrep -v '(\.dpkg-(new|old|dist|bak)|~)$' | \ + while read profile; do + if [ -f "$pdir"/"$profile" ]; then + echo "$pdir"/"$profile" + fi + done) | \ + xargs $n1_args -d"\n" -P$(getconf _NPROCESSORS_ONLN) "$PARSER" "$@" $cache_args $cache_extra_args -- || { + rc_all="$?" + # FIXME: when the parser properly handles broken + # profiles (LP: #1377338), remove this if statement. + # For now, if the xargs returns with error, just run + # through everything with -n1. (This could be broken + # out and refactored, but this is temporary so make it + # easy to understand and revert) + if [ "$rc_all" != "0" ]; then + (ls -1 "$pdir" | \ + egrep -v '(\.dpkg-(new|old|dist|bak)|~)$' | \ + while read profile; do + if [ -f "$pdir"/"$profile" ]; then + echo "$pdir"/"$profile" + fi + done) | \ + xargs -n1 -d"\n" -P$(getconf _NPROCESSORS_ONLN) "$PARSER" "$@" $cache_args $cache_extra_args -- || { + rc_all="$?" + } + fi + } + done + return $rc_all +} + +load_configured_profiles() { + clear_cache_if_outdated + foreach_configured_profile $quiet_arg --write-cache --replace +} + +load_configured_profiles_without_caching() { + foreach_configured_profile $quiet_arg --replace +} + +recache_profiles() { + clear_cache + foreach_configured_profile $quiet_arg --write-cache --skip-kernel-load +} + +configured_profile_names() { + foreach_configured_profile $quiet_arg -N 2>/dev/null | LC_COLLATE=C sort | grep -v '//' +} + +running_profile_names() { + # Output a sorted list of loaded profiles, skipping libvirt's + # dynamically generated files + cat "$AA_SFS"/profiles | sed -e "s/ (\(enforce\|complain\))$//" | egrep -v '^libvirt-[0-9a-f\-]+$' | LC_COLLATE=C sort | grep -v '//' +} + +unload_profile() { + echo -n "$1" > "$AA_SFS"/.remove +} + +clear_cache() { + clear_cache_system + clear_cache_var +} + +clear_cache_system() { + find "$PROFILES_CACHE" -maxdepth 1 -type f -print0 | xargs -0 rm -f -- +} + +clear_cache_var() { + find "$PROFILES_CACHE_VAR" -maxdepth 1 -type f -print0 | xargs -0 rm -f -- +} + +read_features_dir() +{ + for f in `ls -AU "$1"` ; do + if [ -f "$1/$f" ] ; then + read -r KF < "$1/$f" || true + echo -n "$f {$KF } " + elif [ -d "$1/$f" ] ; then + echo -n "$f {" + KF=`read_features_dir "$1/$f"` || true + echo -n "$KF} " + fi + done +} + +clear_cache_if_outdated() { + if [ -r "$PROFILES_CACHE"/.features ]; then + if [ -d "$AA_SFS"/features ]; then + KERN_FEATURES=`read_features_dir "$AA_SFS"/features` + else + read -r KERN_FEATURES < "$AA_SFS"/features + fi + CACHE_FEATURES=`tr '\n' ' ' < "$PROFILES_CACHE"/.features` + if [ "$KERN_FEATURES" != "$CACHE_FEATURES" ]; then + clear_cache + fi + fi +} + +unload_obsolete_profiles() { + # Currently we must re-parse all the profiles to get policy names. :( + aa_configured=$(mktemp -t aa-XXXXXX) + configured_profile_names > "$aa_configured" || true + aa_loaded=$(mktemp -t aa-XXXXXX) + running_profile_names > "$aa_loaded" || true + LC_COLLATE=C comm -2 -3 "$aa_loaded" "$aa_configured" | while read profile ; do + unload_profile "$profile" + done + rm -f "$aa_configured" "$aa_loaded" +} + +# If the system debsum differs from the saved debsum, the new system debsum is +# saved and non-zero is returned. Returns 0 if the two debsums matched or if +# the system debsum file does not exist. This can be removed when system image +# flavors all move to snappy. +compare_and_save_debsums() { + pkg="$1" + + if [ -n $pkg ] && [ -d "$PROFILES_VAR" ]; then + sums="/var/lib/dpkg/info/${pkg}.md5sums" + # store saved md5sums in /var/lib/apparmor/profiles since + # /var/cache/apparmor might be cleared by apparmor + saved_sums="${PROFILES_VAR}/.${pkg}.md5sums" + + if [ -f "$sums" ] && \ + ! diff -q "$sums" "$saved_sums" 2>&1 >/dev/null ; then + cp -f "$sums" "$saved_sums" + return 1 + fi + fi + + return 0 +} + +compare_previous_version() { + installed="/usr/share/snappy/security-policy-version" + previous="/var/lib/snappy/security-policy-version" + + # When just $previous doesn't exist, assume this is a new system with + # no cache and don't do anything special. + if [ -f "$installed" ] && [ -f "$previous" ]; then + pv=`grep '^apparmor/' "$previous" | cut -d ' ' -f 2` + iv=`grep '^apparmor/' "$installed" | cut -d ' ' -f 2` + if [ -n "$iv" ] && [ -n "$pv" ] && [ "$iv" != "$pv" ]; then + # snappy updates $previous elsewhere, so just return + return 1 + fi + fi + + return 0 +} + +# Checks to see if the current container is capable of having internal AppArmor +# profiles that should be loaded. Callers of this function should have already +# verified that they're running inside of a container environment with +# something like `systemd-detect-virt --container`. +# +# The only known container environments capable of supporting internal policy +# are LXD and LXC environment. +# +# Returns 0 if the container environment is capable of having its own internal +# policy and non-zero otherwise. +# +# IMPORTANT: This function will return 0 in the case of a non-LXD/non-LXC +# system container technology being nested inside of a LXD/LXC container that +# utilized an AppArmor namespace and profile stacking. The reason 0 will be +# returned is because .ns_stacked will be "yes" and .ns_name will still match +# "lx[dc]-*" since the nested system container technology will not have set up +# a new AppArmor profile namespace. This will result in the nested system +# container's boot process to experience failed policy loads but the boot +# process should continue without any loss of functionality. This is an +# unsupported configuration that cannot be properly handled by this function. +is_container_with_internal_policy() { + local ns_stacked_path="${AA_SFS}/.ns_stacked" + local ns_name_path="${AA_SFS}/.ns_name" + local ns_stacked + local ns_name + + if ! [ -f "$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 +} |