/usr/share/checksecurity/check-sockets 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 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | #!/bin/sh
#
# Check-sockets checksecurity plugin
#
# This script is designed to find the TCP/UDP sockets bound present on the
# system
#
# 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-sockets.conf'.
#
# This check was based on the 'bound sockets' check available in SuSE's
# seccheck package
#
# Copyright (C) 1999 Marc Heuse <marc@suse.de>
# Copyright (C) 2007 Javier Fernandez-Sanguino <jfs@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.
set -e
PATH=/sbin:/bin:/usr/sbin:/usr/bin
umask 027
cd /
if [ -e /etc/checksecurity/check-socket.conf ]
then
. /etc/checksecurity/check-socket.conf
fi
if [ `/usr/bin/id -u` != 0 ] ; then
echo "Only root has permission to run this script"
exit 1
fi
if [ ! -x /usr/bin/lsof ] ; then
# Exit silently, lsof is not installed
exit 0
fi
TMPSOCKET=${LOGDIR:=/var/log/checksecurity}/sockets.new.tmp
TMPDIFF=${LOGDIR:=/var/log/checksecurity}/sockets.diff.tmp
# Guard against undefined vars
[ -z "$LOGDIR" ] && LOGDIR=/var/log/checksecurity
[ -z "$CHECKSECURITY_IGNORELINES" ] && CHECKSECURITY_IGNORELINES="^$"
if [ ! -e "$LOGDIR" ] ; then
echo "ERROR: Log directory $LOGDIR does not exist"
exit 1
fi
cd $LOGDIR
test -f sockets.today || touch sockets.today
# display programs with TCP/UDP bound sockets
set -o noglob
printf "\nThe following programs have got bound sockets:\n" >$TMPSOCKET
# TODO: (jfs) Enhance using netstat if lsof is not available.
# use the code @Tiger to do this.
# TODO: (jfs) Make it possible to remove
/usr/bin/lsof -i -n -P |
egrep 'UDP|TCP.*LISTEN' |
egrep -v 'UDP.*->.*' |
sed 's/....[0-9]u IP.* / /' |
sed 's/ FD TYPE DEVICE SIZE NODE NAME/PROTO PORT/' |
sed 's/ [0-9][0-9]* / /' |
sed 's/ PID / /'|
sed -e 's/[ \t]\+/ /g' |
egrep -v "$CHECKSECURITY_IGNORELINES" |
sort -u >>$TMPSOCKET
set +o noglob
if cmp -s sockets.today $TMPSOCKET >/dev/null
then
:
else
diff -U0 sockets.today $TMPSOCKET >> $TMPDIFF || [ $? = 1 ]
echo "`hostname` changes to TCP/UDP bound sockets:"
cat $TMPDIFF
if [ `cat $TMPDIFF | wc -l` -gt 0 -a ! -z "$CHECKSECURITY_EMAIL" ]; then
/usr/bin/mail -s "Socket changes for `hostname -f` on `date '+%D %T'`" $CHECKSECURITY_EMAIL < $TMPDIFF
fi
cp $TMPDIFF sockets.changes
mv sockets.today sockets.yesterday
mv $TMPSOCKET sockets.today
chown root:adm sockets.today
fi
rm -f $TMPDIFF
rm -f $TMPSOCKET
exit 0
|