/usr/share/checksecurity/check-passwd is in checksecurity 2.0.14ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #!/bin/sh
#
# Check-passwd checksecurity plugin
#
# This script is designed to check for common weaknesses in passwords
#
# It is part of the 'checksecurity' package, and tests may be configured
# by the global file '/etc/checksecurity.conf' and the file
# '/etc/checksecurity/check-password.conf'.
#
# Copyright (C) 2003-2005 Steve Kemp <skx@debian.org>
#
# Licensed under the GNU General Public License
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
if [ `/usr/bin/id -u` != 0 ] ; then
echo "Only root has permission to run this script"
exit 1
fi
#
# Test for duplicate root login accounts.
#
if [ "x$CHECK_PASSWORD_DUPLICATES" = "xTRUE" ]; then
# Count of UID 0 accounts
NROOT=`awk -F: '{if (0 == $3) print;}' /etc/passwd | wc -l`
# If more than one warn
if [ "$NROOT" != "1" ]; then
# Warn and display offenders
echo "There is more than one root login acounts"
awk -F: '{if (0 == $3) print;}' /etc/passwd
fi
fi
#
# Test for accounts which have no password.
#
if [ "x$CHECK_PASSWORD_EMPTY" = "xTRUE" ]; then
#
# Only test for empty passwords if there is /etc/shadow.
#
if [ -e /etc/shadow ] ; then
awk -F: '{print $1,$2}' /etc/shadow |
while read username passwd
do
case $passwd in
"")
echo User $username has an empty password
;;
*)
;;
esac
done
fi
fi
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