#!/usr/bin/bash -eu
if [ $UID -ne 0 ]; then
echo "WARNING: This script needs to run as root to be effective"
exit 1
fi
export SYSTEMD_NSS_BYPASS_SYNTHETIC=1
if [ "${1:-}" = "--ignore-journal" ]; then
shift
ignore_journal=1
else
ignore_journal=0
fi
echo "Checking processes..."
if ps h -u 99 | grep .; then
echo "ERROR: ps reports processes with UID 99!"
exit 2
fi
echo "... not found"
echo "Checking UTMP..."
if w -h 199 | grep . ; then
echo "ERROR: w reports UID 99 as active!"
exit 2
fi
if w -h nobody | grep . ; then
echo "ERROR: w reports user nobody as active!"
exit 2
fi
echo "... not found"
echo "Checking the journal..."
if [ "$ignore_journal" = 0 ] && journalctl -q -b -n10 _UID=99 | grep . ; then
echo "ERROR: journalctl reports messages from UID 99 in current boot!"
exit 2
fi
echo "... not found"
echo "Looking for files in /etc, /run, /tmp, and /var..."
if find /etc /run /tmp /var -uid 99 -print | grep -m 10 . ; then
echo "ERROR: found files belonging to UID 99"
exit 2
fi
echo "... not found"
echo "Checking if nobody is defined correctly..."
if getent passwd nobody |
grep '^nobody:[x*]:65534:65534:.*:/:/sbin/nologin';
then
echo "OK, nothing to do."
exit 0
else
echo "NOTICE: User nobody is not defined correctly"
fi
echo "Checking if nfsnobody or something else is using the uid..."
if getent passwd 65534 | grep . ; then
echo "NOTICE: will have to remove this user"
else
echo "... not found"
fi
if [ "${1:-}" = "-x" ]; then
if getent passwd nobody >/dev/null; then
# this will remove both the user and the group.
( set -x
userdel nobody
)
fi
if getent passwd 65534 >/dev/null; then
# Make sure the uid is unused. This should free gid too.
name="$(getent passwd 65534 | cut -d: -f1)"
( set -x
userdel "$name"
)
fi
if grep -qE '^(passwd|group):.*\bsss\b' /etc/nsswitch.conf; then
echo "Sleeping, so sss can catch up"
sleep 3
fi
if getent group 65534; then
# Make sure the gid is unused, even if uid wasn't.
name="$(getent group 65534 | cut -d: -f1)"
( set -x
groupdel "$name"
)
fi
# systemd-sysusers uses the same gid and uid
( set -x
systemd-sysusers --inline 'u nobody 65534 "Kernel Overflow User" / /sbin/nologin'
)
else
echo "Pass '-x' to perform changes"
fi
Mini Shell