OpenSUSE Leap 15: File integrity check with AIDE

This article will describe AIDE which is a checker of file integrity.

1 Before install AIDE

Install Postfix with this script.

2 Install AIDE

Install aide package.

> sudo zypper -n in aide
> sudo sed -e 's/^verbose=.*/verbose=5/g' -i /etc/aide.conf

3 Create database

Running "aide –init" creates And you need to copy it to aide.db.

> sudo aide --init.
> sudo cp /var/lib/aide/ /var/lib/aide/aide.db

4 File integrity check

aide –check checks file integrity. aide –update checks file integrity and create new database This needs to copy to aide.db.

> sudo aide --check
> echo $?

If some file is changed, aide will return non zero value.

> sudo mv /usr/sbin/ip /usr/sbin/ip.orig
> echo "modified" | sudo tee /usr/sbin/ip
> sudo aide --check
> echo $?

5 Cron job which runs aide

You need to create cron job. This article will creates daily cron job which runs "aide –update" and send email.

> sudo zypper -n in mailx procmail
> cat <<EOF | sudo tee /etc/cron.daily/aide


lockfile \${LOCK_FILE} || exit 1

TMP=\$(mktemp -t aide.XXXXXX)
trap "rm \$TMP* 2>/dev/null" 0

aide --update > \${TMP} 2>&1
if [ \${ret} -eq 0 ]; then
  # Nothing is changed.
  cp /var/lib/aide/ /var/lib/aide/aide.db
elif [ \${ret} -lt 8 ]; then
  # Some file is changed.
  cat \${TMP} | mail -s "AIDE detects changes" \${MAIL_ADDR}
  cp /var/lib/aide/ /var/lib/aide/aide.db
  # Cannot update database.
  cat \${TMP} | mail -s "AIDE fatal error" \${MAIL_ADDR}

rm -f \${LOCK_FILE}
> sudo chmod a+x /etc/cron.daily/aide