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jammy: add tamper check #82

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Merged
merged 1 commit into from
Jan 24, 2022
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jammy: add tamper check #82

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18 changes: 18 additions & 0 deletions root/etc/cont-init.d/02-tamper-check
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Original file line number Diff line number Diff line change
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#!/usr/bin/with-contenv bash

if ([ -d "/config/custom-cont-init.d" ] && [ -n "$(find /config/custom-cont-init.d ! -user root)" ]) || ([ -d "/config/custom-services.d" ] && [ -n "$(find /config/custom-services.d ! -user root)" ]); then
echo "**** Potential tampering with custom scripts/services detected ****"
randstr=$(< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-8};echo;)
for folder in "/config/custom-cont-init.d" "/config/custom-services.d"; do
if [ -d "${folder}" ]; then
mv "${folder}" "${folder}.${randstr}"
echo "**** Folder ${folder} is moved to ${folder}.${randstr} ****"
fi
done
echo "**** The folders '/config/custom-cont-init.d' and '/config/custom-services.d'; and their contents need to all be owned by root to prevent root escalation inside the container!!! ****"
mkdir -p /config/custom-cont-init.d /config/custom-services.d
chown 0:0 /config/custom-cont-init.d /config/custom-services.d
elif ([ -d "/config/custom-cont-init.d" ] && [ -n "$(find /config/custom-cont-init.d -perm -o+w)" ]) || ([ -d "/config/custom-services.d" ] && [ -n "$(find /config/custom-services.d -perm -o+w)" ]); then
echo "**** The folders '/config/custom-cont-init.d' or '/config/custom-services.d'; or some of their contents have write permissions for others, which is a security risk. ****"
echo "**** Please review the permissions of these two folders and their contents to make sure they are owned by root, and can only be modified by root. ****"
fi