From 5469297999a177996230f208ab5d5de30df7376f Mon Sep 17 00:00:00 2001 From: luisgulo Date: Tue, 7 Nov 2023 16:24:20 +0100 Subject: [PATCH] check .config kernel para Docker Script para comprobar fichero .config para compilar Kernel con soporte para Docker y Docker Swarm --- check-config.sh | 411 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 411 insertions(+) create mode 100644 check-config.sh diff --git a/check-config.sh b/check-config.sh new file mode 100644 index 0000000..7f57c7b --- /dev/null +++ b/check-config.sh @@ -0,0 +1,411 @@ +#!/usr/bin/env sh +set -e + +EXITCODE=0 + +# bits of this were adapted from lxc-checkconfig +# see also https://github.com/lxc/lxc/blob/lxc-1.0.2/src/lxc/lxc-checkconfig.in + +possibleConfigs=" + /proc/config.gz + /boot/config-$(uname -r) + /usr/src/linux-$(uname -r)/.config + /usr/src/linux/.config +" + +if [ $# -gt 0 ]; then + CONFIG="$1" +else + : "${CONFIG:=/proc/config.gz}" +fi + +if ! command -v zgrep > /dev/null 2>&1; then + zgrep() { + zcat "$2" | grep "$1" + } +fi + +kernelVersion="$(uname -r)" +kernelMajor="${kernelVersion%%.*}" +kernelMinor="${kernelVersion#$kernelMajor.}" +kernelMinor="${kernelMinor%%.*}" + +is_set() { + zgrep "CONFIG_$1=[y|m]" "$CONFIG" > /dev/null +} +is_set_in_kernel() { + zgrep "CONFIG_$1=y" "$CONFIG" > /dev/null +} +is_set_as_module() { + zgrep "CONFIG_$1=m" "$CONFIG" > /dev/null +} + +color() { + 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;}$code" + fi + fi + printf '\033[%sm' "$codes" +} +wrap_color() { + text="$1" + shift + color "$@" + printf '%s' "$text" + color reset + echo +} + +wrap_good() { + echo "$(wrap_color "$1" white): $(wrap_color "$2" green)" +} +wrap_bad() { + echo "$(wrap_color "$1" bold): $(wrap_color "$2" bold red)" +} +wrap_warning() { + wrap_color >&2 "$*" red +} + +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 + wrap_bad "CONFIG_$1" 'missing' + EXITCODE=1 + fi +} + +check_flags() { + for flag in "$@"; do + printf -- '- ' + 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' + EXITCODE=1 + fi +} + +check_device() { + if [ -c "$1" ]; then + wrap_good "$1" 'present' + else + wrap_bad "$1" 'missing' + EXITCODE=1 + fi +} + +check_distro_userns() { + if [ ! -e /etc/os-release ]; then + return + fi + . /etc/os-release 2> /dev/null || /bin/true + case "$ID" in + centos | rhel) + case "$VERSION_ID" in + 7*) + # this is a CentOS7 or RHEL7 system + grep -q 'user_namespace.enable=1' /proc/cmdline || { + # no user namespace support enabled + wrap_bad " (RHEL7/CentOS7" "User namespaces disabled; add 'user_namespace.enable=1' to boot command line)" + EXITCODE=1 + } + ;; + esac + ;; + esac +} + +if [ ! -e "$CONFIG" ]; then + wrap_warning "warning: $CONFIG does not exist, searching other paths for kernel config ..." + for tryConfig in $possibleConfigs; do + if [ -e "$tryConfig" ]; then + CONFIG="$tryConfig" + break + fi + done + if [ ! -e "$CONFIG" ]; then + wrap_warning "error: cannot find kernel config" + wrap_warning " try running this script again, specifying the kernel config:" + wrap_warning " CONFIG=/path/to/kernel/.config $0 or $0 /path/to/kernel/.config" + exit 1 + fi +fi + +wrap_color "info: reading kernel config from $CONFIG ..." white +echo + +echo 'Generally Necessary:' + +printf -- '- ' +if [ "$(stat -f -c %t /sys/fs/cgroup 2> /dev/null)" = '63677270' ]; then + wrap_good 'cgroup hierarchy' 'cgroupv2' + cgroupv2ControllerFile='/sys/fs/cgroup/cgroup.controllers' + if [ -f "$cgroupv2ControllerFile" ]; then + echo ' Controllers:' + for controller in cpu cpuset io memory pids; do + if grep -qE '(^| )'"$controller"'($| )' "$cgroupv2ControllerFile"; then + echo " - $(wrap_good "$controller" 'available')" + else + echo " - $(wrap_bad "$controller" 'missing')" + fi + done + else + wrap_bad "$cgroupv2ControllerFile" 'nonexistent??' + fi + # TODO find an efficient way to check if cgroup.freeze exists in subdir +else + cgroupSubsystemDir="$(sed -rne '/^[^ ]+ ([^ ]+) cgroup ([^ ]*,)?(cpu|cpuacct|cpuset|devices|freezer|memory)[, ].*$/ { s//\1/p; q }' /proc/mounts)" + cgroupDir="$(dirname "$cgroupSubsystemDir")" + if [ -d "$cgroupDir/cpu" ] || [ -d "$cgroupDir/cpuacct" ] || [ -d "$cgroupDir/cpuset" ] || [ -d "$cgroupDir/devices" ] || [ -d "$cgroupDir/freezer" ] || [ -d "$cgroupDir/memory" ]; then + echo "$(wrap_good 'cgroup hierarchy' 'properly mounted') [$cgroupDir]" + else + if [ "$cgroupSubsystemDir" ]; then + echo "$(wrap_bad 'cgroup hierarchy' 'single mountpoint!') [$cgroupSubsystemDir]" + else + wrap_bad 'cgroup hierarchy' 'nonexistent??' + fi + EXITCODE=1 + echo " $(wrap_color '(see https://github.com/tianon/cgroupfs-mount)' yellow)" + fi +fi + +if [ "$(cat /sys/module/apparmor/parameters/enabled 2> /dev/null)" = 'Y' ]; then + printf -- '- ' + if command -v apparmor_parser > /dev/null 2>&1; then + wrap_good 'apparmor' 'enabled and tools installed' + else + wrap_bad 'apparmor' 'enabled, but apparmor_parser missing' + printf ' ' + if command -v apt-get > /dev/null 2>&1; then + wrap_color '(use "apt-get install apparmor" to fix this)' + elif command -v yum > /dev/null 2>&1; then + wrap_color '(your best bet is "yum install apparmor-parser")' + else + wrap_color '(look for an "apparmor" package for your distribution)' + fi + EXITCODE=1 + fi +fi + +check_flags \ + NAMESPACES NET_NS PID_NS IPC_NS UTS_NS \ + CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG \ + KEYS \ + VETH BRIDGE BRIDGE_NETFILTER \ + IP_NF_FILTER IP_NF_MANGLE IP_NF_TARGET_MASQUERADE \ + NETFILTER_XT_MATCH_ADDRTYPE \ + NETFILTER_XT_MATCH_CONNTRACK \ + NETFILTER_XT_MATCH_IPVS \ + NETFILTER_XT_MARK \ + IP_NF_NAT NF_NAT \ + POSIX_MQUEUE +# (POSIX_MQUEUE is required for bind-mounting /dev/mqueue into containers) + +if [ "$kernelMajor" -lt 4 ] || ([ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -lt 8 ]); then + check_flags DEVPTS_MULTIPLE_INSTANCES +fi + +if [ "$kernelMajor" -lt 5 ] || [ "$kernelMajor" -eq 5 -a "$kernelMinor" -le 1 ]; then + check_flags NF_NAT_IPV4 +fi + +if [ "$kernelMajor" -lt 5 ] || [ "$kernelMajor" -eq 5 -a "$kernelMinor" -le 2 ]; then + check_flags NF_NAT_NEEDED +fi +# check availability of BPF_CGROUP_DEVICE support +if [ "$kernelMajor" -ge 5 ] || ([ "$kernelMajor" -eq 4 ] && [ "$kernelMinor" -ge 15 ]); then + check_flags CGROUP_BPF +fi + +echo + +echo 'Optional Features:' +{ + check_flags USER_NS + check_distro_userns +} +{ + check_flags SECCOMP + check_flags SECCOMP_FILTER +} +{ + check_flags CGROUP_PIDS +} +{ + check_flags MEMCG_SWAP + # Kernel v5.8+ removes MEMCG_SWAP_ENABLED. + if [ "$kernelMajor" -lt 5 ] || [ "$kernelMajor" -eq 5 -a "$kernelMinor" -le 8 ]; then + CODE=${EXITCODE} + check_flags MEMCG_SWAP_ENABLED + # FIXME this check is cgroupv1-specific + if [ -e /sys/fs/cgroup/memory/memory.memsw.limit_in_bytes ]; then + echo " $(wrap_color '(cgroup swap accounting is currently enabled)' bold black)" + EXITCODE=${CODE} + 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 + else + # Kernel v5.8+ enables swap accounting by default. + echo " $(wrap_color '(cgroup swap accounting is currently enabled)' bold black)" + fi +} +{ + if is_set LEGACY_VSYSCALL_NATIVE; then + printf -- '- ' + 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 + printf -- '- ' + wrap_good "CONFIG_LEGACY_VSYSCALL_EMULATE" 'enabled' + elif is_set LEGACY_VSYSCALL_NONE; then + printf -- '- ' + 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 + +if [ "$kernelMajor" -lt 5 ]; then + check_flags IOSCHED_CFQ CFQ_GROUP_IOSCHED +fi + +check_flags \ + BLK_CGROUP BLK_DEV_THROTTLING \ + CGROUP_PERF \ + CGROUP_HUGETLB \ + NET_CLS_CGROUP $netprio \ + CFS_BANDWIDTH FAIR_GROUP_SCHED \ + IP_NF_TARGET_REDIRECT \ + IP_VS \ + IP_VS_NFCT \ + IP_VS_PROTO_TCP \ + IP_VS_PROTO_UDP \ + IP_VS_RR \ + SECURITY_SELINUX \ + SECURITY_APPARMOR + +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 BRIDGE_VLAN_FILTERING | sed 's/^/ /' +echo ' Optional (for encrypted networks):' +check_flags CRYPTO CRYPTO_AEAD CRYPTO_GCM CRYPTO_SEQIV CRYPTO_GHASH \ + XFRM XFRM_USER XFRM_ALGO INET_ESP NETFILTER_XT_MATCH_BPF | sed 's/^/ /' +if [ "$kernelMajor" -lt 5 ] || [ "$kernelMajor" -eq 5 -a "$kernelMinor" -le 3 ]; then + check_flags INET_XFRM_MODE_TRANSPORT | sed 's/^/ /' +fi +echo " - \"$(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/^/ /' + +# only fail if no storage drivers available +CODE=${EXITCODE} +EXITCODE=0 +STORAGE=1 + +echo '- Storage Drivers:' +echo " - \"$(wrap_color 'btrfs' blue)\":" +check_flags BTRFS_FS | sed 's/^/ /' +check_flags BTRFS_FS_POSIX_ACL | sed 's/^/ /' +[ "$EXITCODE" = 0 ] && STORAGE=0 +EXITCODE=0 + +echo " - \"$(wrap_color 'overlay' blue)\":" +check_flags OVERLAY_FS | sed 's/^/ /' +[ "$EXITCODE" = 0 ] && STORAGE=0 +EXITCODE=0 + +echo " - \"$(wrap_color 'zfs' blue)\":" +printf ' - ' +check_device /dev/zfs +printf ' - ' +check_command zfs +printf ' - ' +check_command zpool +[ "$EXITCODE" = 0 ] && STORAGE=0 +EXITCODE=0 + +EXITCODE=$CODE +[ "$STORAGE" = 1 ] && EXITCODE=1 + +echo + +check_limit_over() { + if [ "$(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 + EXITCODE=1 + else + wrap_good "- $1" "$(cat "$1")" + fi +} + +echo 'Limits:' +check_limit_over /proc/sys/kernel/keys/root_maxkeys 10000 +echo + +exit $EXITCODE