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//usr/lib/systemd/purge-nobody-user

#!/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

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boot DIR	-	drwxr-xr-x	2026-01-26 09:30:25	Edit Download recursive recursive
catalog DIR	-	drwxr-xr-x	2026-01-27 23:01:12	Edit Download recursive recursive
network DIR	-	drwxr-xr-x	2026-01-27 23:01:13	Edit Download recursive recursive
ntp-units.d DIR	-	drwxr-xr-x	2025-03-30 04:15:52	Edit Download recursive recursive
portable DIR	-	drwxr-xr-x	2026-01-26 09:30:25	Edit Download recursive recursive
system DIR	-	drwxr-xr-x	2026-02-05 23:02:17	Edit Download recursive recursive
system-generators DIR	-	drwxr-xr-x	2026-01-27 23:01:13	Edit Download recursive recursive
system-preset DIR	-	drwxr-xr-x	2026-01-27 23:01:12	Edit Download recursive recursive
system-shutdown DIR	-	drwxr-xr-x	2026-01-26 09:30:26	Edit Download recursive recursive
system-sleep DIR	-	drwxr-xr-x	2026-01-26 09:30:26	Edit Download recursive recursive
user DIR	-	drwxr-xr-x	2026-02-03 09:56:07	Edit Download recursive recursive
user-environment-generators DIR	-	drwxr-xr-x	2026-01-27 23:01:12	Edit Download recursive recursive
user-generators DIR	-	drwxr-xr-x	2026-01-26 09:30:26	Edit Download recursive recursive
user-preset DIR	-	drwxr-xr-x	2026-01-27 23:01:12	Edit Download recursive recursive
libsystemd-shared-239.so	2.64 MB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
portablectl	36.99 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
purge-nobody-user	2.30 KB	lrwxr-xr-x	2026-01-26 09:30:26	Edit Download recursive recursive
resolv.conf	678 B	lrw-r--r--	2018-06-22 11:11:49	Edit Download recursive recursive
systemd	1.54 MB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-ac-power	11.88 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-backlight	24.74 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-binfmt	16.70 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-cgroups-agent	12.01 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-coredump	61.17 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-cryptsetup	28.75 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-dissect	16.02 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-export	41.18 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-fsck	24.73 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-growfs	20.44 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-hibernate-resume	12.01 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-hostnamed	28.91 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-initctl	20.44 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-journald	154.41 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-localed	49.18 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-logind	265.31 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-makefs	12.41 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-modules-load	20.42 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-portabled	89.90 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-pstore	20.88 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-quotacheck	12.30 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-random-seed	16.01 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-remount-fs	24.54 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-reply-password	12.01 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-resolved	452.76 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-rfkill	24.75 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-shutdown	61.20 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-sleep	20.77 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-socket-proxyd	24.55 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-sulogin-shell	16.02 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-sysctl	20.77 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-sysv-install	45.11 KB	lrwxr-xr-x	2023-10-14 22:48:04	Edit Download recursive recursive
systemd-timedated	36.95 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-udevd	408.55 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-update-done	12.43 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-update-utmp	16.02 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-user-runtime-dir	245.13 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-user-sessions	11.86 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-vconsole-setup	20.46 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-veritysetup	12.01 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive
systemd-volatile-root	12.01 KB	lrwxr-xr-x	2026-01-26 09:30:39	Edit Download recursive recursive