mirror of https://github.com/k3s-io/k3s
Erik Wilson
5 years ago
1 changed files with 363 additions and 0 deletions
@ -0,0 +1,363 @@
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#!/usr/bin/env bash |
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set -e |
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EXITCODE=0 |
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# bits of this were adapted from lxc-checkconfig |
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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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possibleConfigs=( |
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'/proc/config.gz' |
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"/boot/config-$(uname -r)" |
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"/usr/src/linux-$(uname -r)/.config" |
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'/usr/src/linux/.config' |
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) |
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if [ $# -gt 0 ]; then |
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CONFIG="$1" |
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else |
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: "${CONFIG:="${possibleConfigs[0]}"}" |
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fi |
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if ! command -v zgrep &> /dev/null; then |
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zgrep() { |
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zcat "$2" | grep "$1" |
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} |
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fi |
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kernelVersion="$(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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zgrep "CONFIG_$1=[y|m]" "$CONFIG" > /dev/null |
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} |
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is_set_in_kernel() { |
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zgrep "CONFIG_$1=y" "$CONFIG" > /dev/null |
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} |
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is_set_as_module() { |
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zgrep "CONFIG_$1=m" "$CONFIG" > /dev/null |
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} |
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color() { |
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local codes=() |
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if [ "$1" = 'bold' ]; then |
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codes=( "${codes[@]}" '1' ) |
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shift |
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fi |
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if [ "$#" -gt 0 ]; then |
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local 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=( "${codes[@]}" "$code" ) |
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fi |
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fi |
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local IFS=';' |
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echo -en '\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 "$2" bold red)" |
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} |
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wrap_warning() { |
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wrap_color >&2 "$*" red |
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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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wrap_bad "CONFIG_$1" 'missing' |
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EXITCODE=1 |
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fi |
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} |
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check_flags() { |
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for flag in "$@"; 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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EXITCODE=1 |
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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 "$1" 'missing' |
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EXITCODE=1 |
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fi |
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} |
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check_distro_userns() { |
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source /etc/os-release 2>/dev/null || /bin/true |
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if [[ "${ID}" =~ ^(centos|rhel)$ && "${VERSION_ID}" =~ ^7 ]]; then |
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# this is a CentOS7 or RHEL7 system |
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grep -q "user_namespace.enable=1" /proc/cmdline || { |
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# no user namespace support enabled |
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wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)" |
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EXITCODE=1 |
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} |
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fi |
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} |
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if [ ! -e "$CONFIG" ]; then |
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wrap_warning "warning: $CONFIG does not exist, searching other paths for kernel config ..." |
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for tryConfig in "${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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if [ ! -e "$CONFIG" ]; then |
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wrap_warning "error: cannot find kernel config" |
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wrap_warning " try running this script again, specifying the kernel config:" |
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wrap_warning " CONFIG=/path/to/kernel/.config $0 or $0 /path/to/kernel/.config" |
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exit 1 |
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fi |
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fi |
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wrap_color "info: reading kernel config from $CONFIG ..." white |
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echo |
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echo 'Generally Necessary:' |
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echo -n '- ' |
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cgroupSubsystemDir="$(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 "$cgroupDir/memory" ]; then |
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echo "$(wrap_good 'cgroup hierarchy' 'properly mounted') [$cgroupDir]" |
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else |
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if [ "$cgroupSubsystemDir" ]; then |
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echo "$(wrap_bad 'cgroup hierarchy' 'single mountpoint!') [$cgroupSubsystemDir]" |
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else |
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wrap_bad 'cgroup hierarchy' 'nonexistent??' |
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fi |
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EXITCODE=1 |
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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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EXITCODE=1 |
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fi |
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fi |
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flags=( |
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NAMESPACES {NET,PID,IPC,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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NF_NAT_IPV4 IP_NF_FILTER IP_NF_TARGET_MASQUERADE |
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NETFILTER_XT_MATCH_{ADDRTYPE,CONNTRACK,IPVS} |
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IP_NF_NAT NF_NAT NF_NAT_NEEDED |
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# required for bind-mounting /dev/mqueue into containers |
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POSIX_MQUEUE |
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) |
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check_flags "${flags[@]}" |
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if [ "$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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CODE=${EXITCODE} |
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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 " $(wrap_color '(cgroup swap accounting is currently enabled)' bold black)" |
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EXITCODE=${CODE} |
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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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flags=( |
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BLK_CGROUP BLK_DEV_THROTTLING IOSCHED_CFQ CFQ_GROUP_IOSCHED |
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CGROUP_PERF |
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CGROUP_HUGETLB |
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NET_CLS_CGROUP $netprio |
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CFS_BANDWIDTH FAIR_GROUP_SCHED RT_GROUP_SCHED |
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IP_NF_TARGET_REDIRECT |
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IP_VS |
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IP_VS_NFCT |
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IP_VS_PROTO_TCP |
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IP_VS_PROTO_UDP |
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IP_VS_RR |
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) |
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check_flags "${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 BRIDGE_VLAN_FILTERING | sed 's/^/ /' |
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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 " - \"$(wrap_color 'ftp,tftp client in container' blue)\":" |
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check_flags NF_NAT_FTP NF_CONNTRACK_FTP NF_NAT_TFTP NF_CONNTRACK_TFTP | sed 's/^/ /' |
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# only fail if no storage drivers available |
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CODE=${EXITCODE} |
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EXITCODE=0 |
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STORAGE=1 |
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echo '- Storage Drivers:' |
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echo " - \"$(wrap_color 'aufs' blue)\":" |
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check_flags AUFS_FS | sed 's/^/ /' |
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if ! is_set AUFS_FS && grep -q aufs /proc/filesystems; then |
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echo " $(wrap_color '(note that some kernels include AUFS patches but not the AUFS_FS flag)' bold black)" |
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fi |
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[ "$EXITCODE" = 0 ] && STORAGE=0 |
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EXITCODE=0 |
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echo " - \"$(wrap_color 'btrfs' blue)\":" |
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check_flags BTRFS_FS | sed 's/^/ /' |
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check_flags BTRFS_FS_POSIX_ACL | sed 's/^/ /' |
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[ "$EXITCODE" = 0 ] && STORAGE=0 |
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EXITCODE=0 |
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echo " - \"$(wrap_color 'devicemapper' blue)\":" |
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check_flags BLK_DEV_DM DM_THIN_PROVISIONING | sed 's/^/ /' |
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[ "$EXITCODE" = 0 ] && STORAGE=0 |
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EXITCODE=0 |
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echo " - \"$(wrap_color 'overlay' blue)\":" |
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check_flags OVERLAY_FS | sed 's/^/ /' |
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[ "$EXITCODE" = 0 ] && STORAGE=0 |
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EXITCODE=0 |
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echo " - \"$(wrap_color 'zfs' blue)\":" |
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echo -n " - "; check_device /dev/zfs |
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echo -n " - "; check_command zfs |
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echo -n " - "; check_command zpool |
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[ "$EXITCODE" = 0 ] && STORAGE=0 |
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EXITCODE=0 |
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EXITCODE=$CODE |
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[ "$STORAGE" = 1 ] && EXITCODE=1 |
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echo |
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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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EXITCODE=1 |
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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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echo |
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exit $EXITCODE |
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