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k3s/contrib/util/check-config.sh

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#!/bin/sh
set -e
EXITCODE=0
# rancher/k3s modified from
# https://github.com/moby/moby/blob/c831882/contrib/check-config.sh
# bits of this were adapted from lxc-checkconfig for moby
# see also https://github.com/lxc/lxc/blob/lxc-1.0.2/src/lxc/lxc-checkconfig.in
uname=$(uname -r)
possibleConfigs="
/proc/config.gz
/boot/config-${uname}
/boot/config-${uname##*-}
/usr/src/linux-${uname}/.config
/usr/src/linux/.config
"
binDir=$(dirname "$0")
configFormat=gz
isError=0
if [ $# -gt 0 ]; then
CONFIG="$1"
fi
if ! command -v zgrep >/dev/null 2>&1 || eval "cat /sys/kernel/security/apparmor/profiles | grep -q 'zgrep (enforce)'"; then
zgrep() {
zcat "$2" | grep "$1"
}
fi
dogrep() {
if [ "$configFormat" = "gz" ]; then
zgrep "$1" "$2"
else
grep "$1" "$2"
fi
}
kernelVersion="$(uname -r)"
kernelMajor="${kernelVersion%%.*}"
kernelMinor="${kernelVersion#$kernelMajor.}"
kernelMinor="${kernelMinor%%.*}"
is_set() {
dogrep "CONFIG_$1=[y|m]" "$CONFIG" > /dev/null
}
is_set_in_kernel() {
dogrep "CONFIG_$1=y" "$CONFIG" > /dev/null
}
is_set_as_module() {
dogrep "CONFIG_$1=m" "$CONFIG" > /dev/null
}
color() {
if [ -n "$NO_COLOR" ]; then
return
fi
codes=
if [ "$1" = 'bold' ]; then
codes=1
shift
fi
if [ "$#" -gt 0 ]; then
code=
case "$1" in
# see https://en.wikipedia.org/wiki/ANSI_escape_code#Colors
black) code=30 ;;
red) code=31 ;;
green) code=32 ;;
yellow) code=33 ;;
blue) code=34 ;;
magenta) code=35 ;;
cyan) code=36 ;;
white) code=37 ;;
esac
if [ "$code" ]; then
[ "$codes" ] && codes="${codes};"
codes="${codes}${code}"
fi
fi
printf '\033['"$codes"'m'
}
wrap_color() {
text="$1"
shift
color "$@"
echo -n "$text"
color reset
echo
}
wrap_good() {
echo "$(wrap_color "$1" white): $(wrap_color "$2" green)"
}
wrap_bad() {
echo "$(wrap_color "$1" bold): $(wrap_color "$2 (fail)" bold red)"
EXITCODE=$(($EXITCODE+1))
}
wrap_warn() {
echo "$(wrap_color "$1" bold): $(wrap_color "$2" bold yellow)"
}
warning() {
wrap_color >&2 "$*" yellow
}
check_flag() {
if is_set_in_kernel "$1"; then
wrap_good "CONFIG_$1" 'enabled'
elif is_set_as_module "$1"; then
wrap_good "CONFIG_$1" 'enabled (as module)'
else
if [ $isError -eq 1 ]; then
wrap_bad "CONFIG_$1" 'missing'
else
wrap_warn "CONFIG_$1" 'missing'
fi
fi
}
check_flags() {
for flag in "$@"; do
echo -n "- "; check_flag "$flag"
done
}
check_command() {
if command -v "$1" >/dev/null 2>&1; then
wrap_good "$1 command" 'available'
else
wrap_bad "$1 command" 'missing'
fi
}
check_device() {
if [ -c "$1" ]; then
wrap_good "$1" 'present'
else
wrap_bad "$1" 'missing'
fi
}
check_distro_userns() {
[ -s /etc/os-release ] || return 0
source /etc/os-release 2>/dev/null || true
if ( echo "${ID}" | grep -q -E '^(centos|rhel)$' ) && \
( echo "${VERSION_ID}" | grep -q -E '^7' ); then
# this is a CentOS7 or RHEL7 system
if ! grep -q "user_namespace.enable=1" /proc/cmdline; then
# no user namespace support enabled
wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)"
fi
fi
}
# ---
echo
{
cd $binDir
echo "Verifying binaries in $binDir:"
if [ -s .sha256sums ]; then
sumsTemp=$(mktemp)
if sha256sum -c .sha256sums >$sumsTemp 2>&1; then
wrap_good '- sha256sum' 'good'
else
wrap_bad '- sha256sum' 'does not match'
cat $sumsTemp | sed 's/^/ ... /'
fi
rm -f $sumsTemp
else
wrap_warn '- sha256sum' 'sha256sums unavailable'
fi
linkFail=0
if [ -s .links ]; then
while read file link; do
if [ "$(readlink $file)" != "$link" ]; then
# If no iptables is installed on the host system, the symlink will be different
if [ "$(readlink $file)" = "xtables-legacy-multi" ]; then
wrap_warn "- $file" "symlink to xtables-legacy-multi"
elif [ "$(readlink $file)" = "xtables-nft-multi" ]; then
wrap_warn "- $file" "symlink to xtables-nft-multi"
else
wrap_bad "- $file" "symlink to $link"
linkFail=1
fi
fi
done <.links
if [ $linkFail -eq 0 ]; then
wrap_good '- links' 'good'
fi
else
wrap_warn '- links' 'link list unavailable'
fi
cd - >/dev/null
}
echo
{
version_ge() {
[ "$1" = "$2" ] || [ "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1" ]
}
version_less() {
[ "$(printf '%s\n' "$@" | sort -rV | head -n 1)" != "$1" ]
}
which_iptables() {
(
localIPtables=$(command -v iptables)
PATH=$(printf "%s" "$(echo -n $PATH | tr ":" "\n" | grep -v -E "^$binDir$")" | tr "\n" ":")
systemIPtables=$(command -v iptables)
if [ -n "$systemIPtables" ]; then
echo $systemIPtables
return
fi
echo $localIPtables
)
}
echo "System:"
iptablesCmd=$(which_iptables)
iptablesVersion=
if [ "$iptablesCmd" ]; then
iptablesInfo=$($iptablesCmd --version 2>/dev/null) || true
iptablesVersion=$(echo $iptablesInfo | awk '{ print $2 }')
label="$(dirname $iptablesCmd) $iptablesInfo"
fi
if echo "$iptablesVersion" | grep -v -q -E '^v[0-9]'; then
[ "$iptablesCmd" ] || iptablesCmd="unknown iptables"
wrap_warn "- $iptablesCmd" "unknown version: $iptablesInfo"
elif version_ge $iptablesVersion v1.8.0; then
iptablesMode=$(echo $iptablesInfo | awk '{ print $3 }')
if [ "$iptablesMode" != "(legacy)" ] && version_less $iptablesVersion v1.8.4; then
wrap_bad "- $label" 'should be older than v1.8.0, newer than v1.8.3, or in legacy mode'
else
wrap_good "- $label" 'ok'
fi
else
wrap_good "- $label" 'older than v1.8'
fi
totalSwap=$(free | grep -i '^swap:' | awk '{ print $2 }')
if [ "$totalSwap" != "0" ]; then
wrap_warn '- swap' 'should be disabled'
else
wrap_good '- swap' 'disabled'
fi
if ip route | grep -v cni0 | grep -q -E '^10\.(42|43)\.'; then
wrap_warn '- routes' 'default CIDRs 10.42.0.0/16 or 10.43.0.0/16 already routed'
else
wrap_good '- routes' 'ok'
fi
}
echo
{
check_limit_over()
{
if [ "$(cat "$1")" -le "$2" ]; then
wrap_bad "- $1" "$(cat "$1")"
wrap_color " This should be set to at least $2, for example set: sysctl -w kernel/keys/root_maxkeys=1000000" bold black
else
wrap_good "- $1" "$(cat "$1")"
fi
}
echo 'Limits:'
check_limit_over /proc/sys/kernel/keys/root_maxkeys 10000
}
echo
# ---
SUDO=
[ $(id -u) -ne 0 ] && SUDO=sudo
lsmod | grep -q configs || $SUDO modprobe configs || true
if [ -z "$CONFIG" ]; then
for tryConfig in ${possibleConfigs}; do
if [ -e "$tryConfig" ]; then
CONFIG="$tryConfig"
break
fi
done
fi
if [ ! -e "$CONFIG" ]; then
case "$CONFIG" in
-*)
warning "error: argument $CONFIG"
;;
*)
warning "error: cannot find kernel config $CONFIG"
;;
esac
warning " try running this script again, specifying the kernel config:"
warning " set CONFIG=/path/to/kernel/.config or add argument /path/to/kernel/.config"
exit 1
fi
wrap_color "info: reading kernel config from $CONFIG ..." cyan
zcat $CONFIG >/dev/null 2>&1 || configFormat=
echo
echo 'Generally Necessary:'
cgroupV2FsType='63677270'
cgroupFsType="$(stat --file-system --format=%t /sys/fs/cgroup 2>/dev/null || :)"
cgroupHybridFsType="$(stat --file-system --format=%t /sys/fs/cgroup/unified 2>/dev/null || :)"
echo -n '- '
case "${cgroupFsType}:${cgroupHybridFsType}" in
'':*)
cgroupVariant='Nonexistent'
;;
${cgroupV2FsType}:*)
cgroupVariant='V2'
;;
*:${cgroupV2FsType})
cgroupVariant='Hybrid'
;;
*)
cgroupVariant='V1'
;;
esac
case "${cgroupVariant}" in
Nonexistent)
wrap_bad 'cgroup hierarchy' "cgroups ${cgroupVariant}"
;;
*)
case "${cgroupVariant}" in
V2)
cgroupMatch='cpu|cpuset|memory'
cgroupMatchNum=3
cgroupFile='/sys/fs/cgroup/cgroup.controllers'
;;
*)
cgroupMatch='cpuset|memory'
cgroupMatchNum=2
cgroupFile='/proc/self/cgroup'
;;
esac
if [ "$(tr -s ' ' '\n' <"${cgroupFile}" 2>/dev/null | grep -Ec "(^|:)(${cgroupMatch})(\$|:)")" -eq ${cgroupMatchNum} ]; then
cgroupStatus='good'
else
cgroupStatus='bad'
fi
wrap_${cgroupStatus} 'cgroup hierarchy' "cgroups ${cgroupVariant} mounted, ${cgroupMatch} controllers status: ${cgroupStatus}"
if [ "x${cgroupStatus}" = 'xbad' ]; then
warning ' (for cgroups V1/Hybrid on non-Systemd init see https://github.com/tianon/cgroupfs-mount)'
fi
;;
esac
if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
echo -n '- '
if command -v apparmor_parser &> /dev/null; then
wrap_good 'apparmor' 'enabled and tools installed'
else
wrap_bad 'apparmor' 'enabled, but apparmor_parser missing'
echo -n ' '
if command -v apt-get &> /dev/null; then
wrap_color '(use "apt-get install apparmor" to fix this)'
elif command -v yum &> /dev/null; then
wrap_color '(your best bet is "yum install apparmor-parser")'
elif command -v zypper &> /dev/null; then
wrap_color '(your best bet is "zypper install apparmor-parser")'
else
wrap_color '(look for an "apparmor" package for your distribution)'
fi
fi
fi
flags="
NAMESPACES NET_NS PID_NS IPC_NS UTS_NS
CGROUPS CGROUP_PIDS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG
KEYS
VETH BRIDGE BRIDGE_NETFILTER
IP_NF_FILTER IP_NF_TARGET_MASQUERADE
NETFILTER_XT_MATCH_ADDRTYPE NETFILTER_XT_MATCH_CONNTRACK NETFILTER_XT_MATCH_IPVS NETFILTER_XT_MATCH_COMMENT NETFILTER_XT_MATCH_MULTIPORT
IP_NF_NAT NF_NAT
POSIX_MQUEUE
"
isError=1 check_flags $flags && isError=0
if [ "$kernelMajor" -lt 4 ] || ( [ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -lt 8 ] ); then
check_flags DEVPTS_MULTIPLE_INSTANCES
fi
echo
echo 'Optional Features:'
{
check_flags USER_NS
check_distro_userns
}
{
check_flags SECCOMP
}
# {
# check_flags MEMCG_SWAP MEMCG_SWAP_ENABLED
# if [ -e /sys/fs/cgroup/memory/memory.memsw.limit_in_bytes ]; then
# echo " $(wrap_color '(cgroup swap accounting is currently enabled)' bold black)"
# elif is_set MEMCG_SWAP && ! is_set MEMCG_SWAP_ENABLED; then
# echo " $(wrap_color '(cgroup swap accounting is currently not enabled, you can enable it by setting boot option "swapaccount=1")' bold black)"
# fi
# }
# {
# if is_set LEGACY_VSYSCALL_NATIVE; then
# echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NATIVE" 'enabled'
# echo " $(wrap_color '(dangerous, provides an ASLR-bypassing target with usable ROP gadgets.)' bold black)"
# elif is_set LEGACY_VSYSCALL_EMULATE; then
# echo -n "- "; wrap_good "CONFIG_LEGACY_VSYSCALL_EMULATE" 'enabled'
# elif is_set LEGACY_VSYSCALL_NONE; then
# echo -n "- "; wrap_bad "CONFIG_LEGACY_VSYSCALL_NONE" 'enabled'
# echo " $(wrap_color '(containers using eglibc <= 2.13 will not work. Switch to' bold black)"
# echo " $(wrap_color ' "CONFIG_VSYSCALL_[NATIVE|EMULATE]" or use "vsyscall=[native|emulate]"' bold black)"
# echo " $(wrap_color ' on kernel command line. Note that this will disable ASLR for the,' bold black)"
# echo " $(wrap_color ' VDSO which may assist in exploiting security vulnerabilities.)' bold black)"
# # else Older kernels (prior to 3dc33bd30f3e, released in v4.40-rc1) do
# # not have these LEGACY_VSYSCALL options and are effectively
# # LEGACY_VSYSCALL_EMULATE. Even older kernels are presumably
# # effectively LEGACY_VSYSCALL_NATIVE.
# fi
# }
if [ "$kernelMajor" -lt 4 ] || ( [ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -le 5 ] ); then
check_flags MEMCG_KMEM
fi
if [ "$kernelMajor" -lt 3 ] || ( [ "$kernelMajor" -eq 3 ] && [ "$kernelMinor" -le 18 ] ); then
check_flags RESOURCE_COUNTERS
fi
if [ "$kernelMajor" -lt 3 ] || ( [ "$kernelMajor" -eq 3 ] && [ "$kernelMinor" -le 13 ] ); then
netprio=NETPRIO_CGROUP
else
netprio=CGROUP_NET_PRIO
fi
# IOSCHED_CFQ CFQ_GROUP_IOSCHED
flags="
BLK_CGROUP BLK_DEV_THROTTLING
CGROUP_PERF
CGROUP_HUGETLB
NET_CLS_CGROUP $netprio
CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED
IP_NF_TARGET_REDIRECT
IP_SET
IP_VS
IP_VS_NFCT
IP_VS_PROTO_TCP
IP_VS_PROTO_UDP
IP_VS_RR
"
check_flags $flags
# if ! is_set EXT4_USE_FOR_EXT2; then
# check_flags EXT3_FS EXT3_FS_XATTR EXT3_FS_POSIX_ACL EXT3_FS_SECURITY
# if ! is_set EXT3_FS || ! is_set EXT3_FS_XATTR || ! is_set EXT3_FS_POSIX_ACL || ! is_set EXT3_FS_SECURITY; then
# echo " $(wrap_color '(enable these ext3 configs if you are using ext3 as backing filesystem)' bold black)"
# fi
# fi
check_flags EXT4_FS EXT4_FS_POSIX_ACL EXT4_FS_SECURITY
if ! is_set EXT4_FS || ! is_set EXT4_FS_POSIX_ACL || ! is_set EXT4_FS_SECURITY; then
if is_set EXT4_USE_FOR_EXT2; then
echo " $(wrap_color 'enable these ext4 configs if you are using ext3 or ext4 as backing filesystem' bold black)"
else
echo " $(wrap_color 'enable these ext4 configs if you are using ext4 as backing filesystem' bold black)"
fi
fi
echo '- Network Drivers:'
echo " - \"$(wrap_color 'overlay' blue)\":"
check_flags VXLAN | sed 's/^/ /' # BRIDGE_VLAN_FILTERING
echo ' Optional (for encrypted networks):'
check_flags CRYPTO CRYPTO_AEAD CRYPTO_GCM CRYPTO_SEQIV CRYPTO_GHASH \
XFRM XFRM_USER XFRM_ALGO INET_ESP INET_XFRM_MODE_TRANSPORT | sed 's/^/ /'
# echo " - \"$(wrap_color 'ipvlan' blue)\":"
# check_flags IPVLAN | sed 's/^/ /'
# echo " - \"$(wrap_color 'macvlan' blue)\":"
# check_flags MACVLAN DUMMY | sed 's/^/ /'
# echo " - \"$(wrap_color 'ftp,tftp client in container' blue)\":"
# check_flags NF_NAT_FTP NF_CONNTRACK_FTP NF_NAT_TFTP NF_CONNTRACK_TFTP | sed 's/^/ /'
echo '- Storage Drivers:'
echo " - \"$(wrap_color 'overlay' blue)\":"
check_flags OVERLAY_FS | sed 's/^/ /'
# ---
echo
if [ $EXITCODE -eq 0 ]; then
wrap_good 'STATUS' 'pass'
else
wrap_bad 'STATUS' $EXITCODE
fi
exit $EXITCODE
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