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468 lines
12 KiB
468 lines
12 KiB
#!/bin/sh
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set -e
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EXITCODE=0
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# rancher/k3s modified from
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# https://github.com/moby/moby/blob/c831882/contrib/check-config.sh
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# bits of this were adapted from lxc-checkconfig for moby
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# see also https://github.com/lxc/lxc/blob/lxc-1.0.2/src/lxc/lxc-checkconfig.in
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uname=$(uname -r)
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possibleConfigs="
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/proc/config.gz
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/boot/config-${uname}
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/boot/config-${uname##*-}
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/usr/src/linux-${uname}/.config
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/usr/src/linux/.config
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"
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binDir=$(dirname "$0")
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configFormat=gz
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isError=0
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if [ $# -gt 0 ]; then
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CONFIG="$1"
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fi
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if ! command -v zgrep >/dev/null 2>&1; then
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zgrep() {
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zcat "$2" | grep "$1"
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}
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fi
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dogrep() {
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if [ "$configFormat" = "gz" ]; then
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zgrep "$1" "$2"
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else
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grep "$1" "$2"
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fi
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}
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kernelVersion="$(uname -r)"
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kernelMajor="${kernelVersion%%.*}"
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kernelMinor="${kernelVersion#$kernelMajor.}"
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kernelMinor="${kernelMinor%%.*}"
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is_set() {
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dogrep "CONFIG_$1=[y|m]" "$CONFIG" > /dev/null
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}
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is_set_in_kernel() {
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dogrep "CONFIG_$1=y" "$CONFIG" > /dev/null
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}
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is_set_as_module() {
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dogrep "CONFIG_$1=m" "$CONFIG" > /dev/null
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}
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color() {
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codes=
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if [ "$1" = 'bold' ]; then
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codes=1
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shift
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fi
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if [ "$#" -gt 0 ]; then
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code=
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case "$1" in
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# see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
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black) code=30 ;;
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red) code=31 ;;
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green) code=32 ;;
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yellow) code=33 ;;
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blue) code=34 ;;
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magenta) code=35 ;;
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cyan) code=36 ;;
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white) code=37 ;;
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esac
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if [ "$code" ]; then
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[ "$codes" ] && codes="${codes};"
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codes="${codes}${code}"
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fi
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fi
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printf '\033['"$codes"'m'
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}
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wrap_color() {
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text="$1"
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shift
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color "$@"
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echo -n "$text"
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color reset
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echo
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}
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wrap_good() {
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echo "$(wrap_color "$1" white): $(wrap_color "$2" green)"
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}
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wrap_bad() {
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echo "$(wrap_color "$1" bold): $(wrap_color "$2 (fail)" bold red)"
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EXITCODE=$(($EXITCODE+1))
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}
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wrap_warn() {
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echo "$(wrap_color "$1" bold): $(wrap_color "$2" bold yellow)"
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}
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warning() {
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wrap_color >&2 "$*" yellow
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}
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check_flag() {
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if is_set_in_kernel "$1"; then
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wrap_good "CONFIG_$1" 'enabled'
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elif is_set_as_module "$1"; then
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wrap_good "CONFIG_$1" 'enabled (as module)'
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else
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if [ $isError -eq 1 ]; then
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wrap_bad "CONFIG_$1" 'missing'
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else
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wrap_warn "CONFIG_$1" 'missing'
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fi
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fi
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}
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check_flags() {
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for flag in "$@"; do
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echo -n "- "; check_flag "$flag"
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done
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}
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check_command() {
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if command -v "$1" >/dev/null 2>&1; then
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wrap_good "$1 command" 'available'
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else
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wrap_bad "$1 command" 'missing'
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fi
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}
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check_device() {
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if [ -c "$1" ]; then
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wrap_good "$1" 'present'
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else
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wrap_bad "$1" 'missing'
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fi
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}
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check_distro_userns() {
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[ -s /etc/os-release ] || return 0
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source /etc/os-release 2>/dev/null || true
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if ( echo "${ID}" | grep -q -E '^(centos|rhel)$' ) && \
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( echo "${VERSION_ID}" | grep -q -E '^7' ); then
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# this is a CentOS7 or RHEL7 system
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if ! grep -q "user_namespace.enable=1" /proc/cmdline; then
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# no user namespace support enabled
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wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)"
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fi
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fi
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}
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# ---
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echo
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{
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cd $binDir
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echo "Verifying binaries in $binDir:"
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if [ -s .sha256sums ]; then
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sumsTemp=$(mktemp)
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if sha256sum -c .sha256sums >$sumsTemp 2>&1; then
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wrap_good '- sha256sum' 'good'
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else
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wrap_bad '- sha256sum' 'does not match'
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cat $sumsTemp | sed 's/^/ ... /'
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fi
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rm -f $sumsTemp
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else
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wrap_warn '- sha256sum' 'sha256sums unavailable'
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fi
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linkFail=0
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if [ -s .links ]; then
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while read file link; do
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if [ "$(readlink $file)" != "$link" ]; then
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wrap_bad '- links' "$file should link to $link"
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linkFail=1
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fi
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done <.links
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if [ $linkFail -eq 0 ]; then
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wrap_good '- links' 'good'
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fi
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else
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wrap_warn '- links' 'link list unavailable'
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fi
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cd - >/dev/null
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}
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echo
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{
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version_ge() {
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[ "$1" = "$2" ] || [ "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1" ]
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}
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version_less() {
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[ "$(printf '%s\n' "$@" | sort -rV | head -n 1)" != "$1" ]
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}
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which_iptables() {
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(
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localIPtables=$(command -v iptables)
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PATH=$(printf "%s" "$(echo -n $PATH | tr ":" "\n" | grep -v -E "^$binDir$")" | tr "\n" ":")
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systemIPtables=$(command -v iptables)
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if [ -n "$systemIPtables" ]; then
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echo $systemIPtables
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return
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fi
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echo $localIPtables
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)
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}
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echo "System:"
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iptablesCmd=$(which_iptables)
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iptablesVersion=
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if [ "$iptablesCmd" ]; then
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iptablesInfo=$($iptablesCmd --version 2>/dev/null) || true
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iptablesVersion=$(echo $iptablesInfo | awk '{ print $2 }')
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label="$(dirname $iptablesCmd) $iptablesInfo"
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fi
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if echo "$iptablesVersion" | grep -v -q -E '^v[0-9]'; then
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[ "$iptablesCmd" ] || iptablesCmd="unknown iptables"
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wrap_warn "- $iptablesCmd" "unknown version: $iptablesInfo"
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elif version_ge $iptablesVersion v1.8.0; then
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iptablesMode=$(echo $iptablesInfo | awk '{ print $3 }')
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if [ "$iptablesMode" != "(legacy)" ] && version_less $iptablesVersion v1.8.4; then
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wrap_bad "- $label" 'should be older than v1.8.0, newer than v1.8.3, or in legacy mode'
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else
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wrap_good "- $label" 'ok'
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fi
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else
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wrap_good "- $label" 'older than v1.8'
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fi
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totalSwap=$(free | grep -i '^swap:' | awk '{ print $2 }')
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if [ "$totalSwap" != "0" ]; then
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wrap_warn '- swap' 'should be disabled'
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else
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wrap_good '- swap' 'disabled'
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fi
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if ip route | grep -v cni0 | grep -q -E '^10\.(42|43)\.'; then
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wrap_warn '- routes' 'default CIDRs 10.42.0.0/16 or 10.43.0.0/16 already routed'
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else
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wrap_good '- routes' 'ok'
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fi
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}
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echo
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{
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check_limit_over()
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{
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if [ "$(cat "$1")" -le "$2" ]; then
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wrap_bad "- $1" "$(cat "$1")"
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wrap_color " This should be set to at least $2, for example set: sysctl -w kernel/keys/root_maxkeys=1000000" bold black
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else
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wrap_good "- $1" "$(cat "$1")"
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fi
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}
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echo 'Limits:'
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check_limit_over /proc/sys/kernel/keys/root_maxkeys 10000
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}
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echo
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# ---
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SUDO=
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[ $(id -u) -ne 0 ] && SUDO=sudo
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lsmod | grep -q configs || $SUDO modprobe configs || true
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if [ -z "$CONFIG" ]; then
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for tryConfig in ${possibleConfigs}; do
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if [ -e "$tryConfig" ]; then
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CONFIG="$tryConfig"
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break
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fi
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done
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fi
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if [ ! -e "$CONFIG" ]; then
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case "$CONFIG" in
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-*)
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warning "error: argument $CONFIG"
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;;
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*)
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warning "error: cannot find kernel config $CONFIG"
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;;
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esac
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warning " try running this script again, specifying the kernel config:"
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warning " set CONFIG=/path/to/kernel/.config or add argument /path/to/kernel/.config"
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exit 1
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fi
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wrap_color "info: reading kernel config from $CONFIG ..." cyan
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zcat $CONFIG >/dev/null 2>&1 || configFormat=
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echo
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echo 'Generally Necessary:'
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echo -n '- '
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cgroupSubsystemDir="$(awk '/[, ](cpu|cpuacct|cpuset|devices|freezer|memory)[, ]/ && $3 == "cgroup" { print $2 }' /proc/mounts | head -n1)"
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cgroupDir="$(dirname "$cgroupSubsystemDir")"
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if [ -d "$cgroupDir/cpu" ] || [ -d "$cgroupDir/cpuacct" ] || [ -d "$cgroupDir/cpuset" ] || [ -d "$cgroupDir/devices" ] || [ -d "$cgroupDir/freezer" ] || [ -d "$cgroupDir/memory" ]; then
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wrap_good 'cgroup hierarchy' "properly mounted [$cgroupDir]"
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else
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if [ "$cgroupSubsystemDir" ]; then
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wrap_bad 'cgroup hierarchy' "single mountpoint! [$cgroupSubsystemDir]"
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else
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wrap_bad 'cgroup hierarchy' 'nonexistent??'
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fi
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echo " $(wrap_color '(see https://github.com/tianon/cgroupfs-mount)' yellow)"
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fi
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if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
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echo -n '- '
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if command -v apparmor_parser &> /dev/null; then
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wrap_good 'apparmor' 'enabled and tools installed'
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else
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wrap_bad 'apparmor' 'enabled, but apparmor_parser missing'
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echo -n ' '
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if command -v apt-get &> /dev/null; then
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wrap_color '(use "apt-get install apparmor" to fix this)'
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elif command -v yum &> /dev/null; then
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wrap_color '(your best bet is "yum install apparmor-parser")'
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else
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wrap_color '(look for an "apparmor" package for your distribution)'
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fi
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fi
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fi
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flags="
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NAMESPACES NET_NS PID_NS IPC_NS UTS_NS
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CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG
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KEYS
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VETH BRIDGE BRIDGE_NETFILTER
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IP_NF_FILTER IP_NF_TARGET_MASQUERADE
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NETFILTER_XT_MATCH_ADDRTYPE NETFILTER_XT_MATCH_CONNTRACK NETFILTER_XT_MATCH_IPVS
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IP_NF_NAT NF_NAT
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POSIX_MQUEUE
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"
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isError=1 check_flags $flags && isError=0
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if [ "$kernelMajor" -lt 4 ] || ( [ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -lt 8 ] ); then
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check_flags DEVPTS_MULTIPLE_INSTANCES
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fi
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echo
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echo 'Optional Features:'
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{
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check_flags USER_NS
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check_distro_userns
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}
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{
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check_flags SECCOMP
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}
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{
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check_flags CGROUP_PIDS
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}
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# {
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# check_flags MEMCG_SWAP MEMCG_SWAP_ENABLED
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# if [ -e /sys/fs/cgroup/memory/memory.memsw.limit_in_bytes ]; then
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# echo " $(wrap_color '(cgroup swap accounting is currently enabled)' bold black)"
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# elif is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then
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# echo " $(wrap_color '(cgroup swap accounting is currently not enabled, you can enable it by setting boot option "swapaccount=1")' bold black)"
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# fi
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# }
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# {
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# if is_set LEGACY_VSYSCALL_NATIVE; then
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# echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NATIVE" 'enabled'
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# echo " $(wrap_color '(dangerous, provides an ASLR-bypassing target with usable ROP gadgets.)' bold black)"
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# elif is_set LEGACY_VSYSCALL_EMULATE; then
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# echo -n "- "; wrap_good "CONFIG_LEGACY_VSYSCALL_EMULATE" 'enabled'
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# elif is_set LEGACY_VSYSCALL_NONE; then
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# echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NONE" 'enabled'
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# echo " $(wrap_color '(containers using eglibc <= 2.13 will not work. Switch to' bold black)"
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# echo " $(wrap_color ' "CONFIG_VSYSCALL_[NATIVE|EMULATE]" or use "vsyscall=[native|emulate]"' bold black)"
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# echo " $(wrap_color ' on kernel command line. Note that this will disable ASLR for the,' bold black)"
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# echo " $(wrap_color ' VDSO which may assist in exploiting security vulnerabilities.)' bold black)"
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# # else Older kernels (prior to 3dc33bd30f3e, released in v4.40-rc1) do
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# # not have these LEGACY_VSYSCALL options and are effectively
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# # LEGACY_VSYSCALL_EMULATE. Even older kernels are presumably
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# # effectively LEGACY_VSYSCALL_NATIVE.
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# fi
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# }
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if [ "$kernelMajor" -lt 4 ] || ( [ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -le 5 ] ); then
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check_flags MEMCG_KMEM
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fi
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if [ "$kernelMajor" -lt 3 ] || ( [ "$kernelMajor" -eq 3 ] && [ "$kernelMinor" -le 18 ] ); then
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check_flags RESOURCE_COUNTERS
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fi
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if [ "$kernelMajor" -lt 3 ] || ( [ "$kernelMajor" -eq 3 ] && [ "$kernelMinor" -le 13 ] ); then
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netprio=NETPRIO_CGROUP
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else
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netprio=CGROUP_NET_PRIO
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fi
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# IOSCHED_CFQ CFQ_GROUP_IOSCHED
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flags="
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BLK_CGROUP BLK_DEV_THROTTLING
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CGROUP_PERF
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CGROUP_HUGETLB
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NET_CLS_CGROUP $netprio
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CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
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IP_NF_TARGET_REDIRECT
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IP_SET
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IP_VS
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IP_VS_NFCT
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IP_VS_PROTO_TCP
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IP_VS_PROTO_UDP
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IP_VS_RR
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"
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check_flags $flags
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# if ! is_set EXT4_USE_FOR_EXT2; then
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# check_flags EXT3_FS EXT3_FS_XATTR EXT3_FS_POSIX_ACL EXT3_FS_SECURITY
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# if ! is_set EXT3_FS || ! is_set EXT3_FS_XATTR || ! is_set EXT3_FS_POSIX_ACL || ! is_set EXT3_FS_SECURITY; then
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# echo " $(wrap_color '(enable these ext3 configs if you are using ext3 as backing filesystem)' bold black)"
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# fi
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# fi
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check_flags EXT4_FS EXT4_FS_POSIX_ACL EXT4_FS_SECURITY
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if ! is_set EXT4_FS || ! is_set EXT4_FS_POSIX_ACL || ! is_set EXT4_FS_SECURITY; then
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if is_set EXT4_USE_FOR_EXT2; then
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echo " $(wrap_color 'enable these ext4 configs if you are using ext3 or ext4 as backing filesystem' bold black)"
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else
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echo " $(wrap_color 'enable these ext4 configs if you are using ext4 as backing filesystem' bold black)"
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fi
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fi
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echo '- Network Drivers:'
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echo " - \"$(wrap_color 'overlay' blue)\":"
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check_flags VXLAN | sed 's/^/ /' # BRIDGE_VLAN_FILTERING
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echo ' Optional (for encrypted networks):'
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check_flags CRYPTO CRYPTO_AEAD CRYPTO_GCM CRYPTO_SEQIV CRYPTO_GHASH \
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XFRM XFRM_USER XFRM_ALGO INET_ESP INET_XFRM_MODE_TRANSPORT | sed 's/^/ /'
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# echo " - \"$(wrap_color 'ipvlan' blue)\":"
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# check_flags IPVLAN | sed 's/^/ /'
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# echo " - \"$(wrap_color 'macvlan' blue)\":"
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# check_flags MACVLAN DUMMY | sed 's/^/ /'
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# echo " - \"$(wrap_color 'ftp,tftp client in container' blue)\":"
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# check_flags NF_NAT_FTP NF_CONNTRACK_FTP NF_NAT_TFTP NF_CONNTRACK_TFTP | sed 's/^/ /'
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echo '- Storage Drivers:'
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echo " - \"$(wrap_color 'overlay' blue)\":"
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check_flags OVERLAY_FS | sed 's/^/ /'
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# ---
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echo
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if [ $EXITCODE -eq 0 ]; then
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wrap_good 'STATUS' 'pass'
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else
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wrap_bad 'STATUS' $EXITCODE
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fi
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exit $EXITCODE
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