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#!/bin/sh -
#
# @(#)security 5.3 (Berkeley) 5/28/91
# $Id: security,v 1.22 1997/09/26 01:38:30 alex Exp $
#
PATH=/sbin:/bin:/usr/bin
LC_ALL=C; export LC_ALL
separator () {
echo ""
echo ""
}
host=`hostname -s`
echo "Subject: $host security check output"
LOG=/var/log
TMP=/var/run/_secure.$$
umask 027
echo "checking setuid files and devices:"
# don't have ncheck, but this does the equivalent of the commented out block.
# note that one of the original problem, the possibility of overrunning
# the args to ls, is still here...
#
MP=`mount -t ufs | grep -v " nosuid" | sed 's;/dev/;&r;' | awk '{ print $3 }'`
set $MP
while test $# -ge 1; do
mount=$1
shift
find $mount -xdev -type f \
\( -perm -u+x -or -perm -g+x -or -perm -o+x \) \
\( -perm -u+s -or -perm -g+s \) -print0
done | xargs -0 -n 20 ls -lTd | sort +9 > $TMP
if [ ! -f $LOG/setuid.today ] ; then
separator
echo "no $LOG/setuid.today"
cp $TMP $LOG/setuid.today
fi
if cmp $LOG/setuid.today $TMP >/dev/null; then :; else
separator
echo "$host setuid diffs:"
diff -b $LOG/setuid.today $TMP
mv $LOG/setuid.today $LOG/setuid.yesterday
mv $TMP $LOG/setuid.today
fi
separator
echo "checking for uids of 0:"
awk 'BEGIN {FS=":"} $3=="0" {print $1,$3}' /etc/master.passwd
# show denied packets
if ipfw -a l 2>/dev/null | egrep "deny|reset|unreach" > $TMP; then
if [ ! -f $LOG/ipfw.today ] ; then
separator
echo "no $LOG/ipfw.today"
cp $TMP $LOG/ipfw.today
fi
if cmp $LOG/ipfw.today $TMP >/dev/null; then :; else
separator
echo "$host denied packets:"
diff -b $LOG/ipfw.today $TMP | egrep "^>"
mv $LOG/ipfw.today $LOG/ipfw.yesterday
mv $TMP $LOG/ipfw.today
fi
fi
# show ipfw rules which have reached the log limit
IPFW_LOG_LIMIT=`sysctl -n net.inet.ip.fw.verbose_limit 2> /dev/null`
if [ $? -eq 0 ] && [ $IPFW_LOG_LIMIT -ne 0 ]; then
ipfw -a l | grep " log " | perl -n -e \
'/^\d+\s+(\d+)/; print if ($1 >= '$IPFW_LOG_LIMIT')' > $TMP
if [ -s $TMP ]; then
separator
echo "ipfw log limit reached:"
cat $TMP
fi
fi
# show kernel log messages
if dmesg 2>/dev/null > $TMP; then
if [ ! -f $LOG/dmesg.today ] ; then
separator
echo "no $LOG/dmesg.today"
cp $TMP $LOG/dmesg.today
fi
if cmp $LOG/dmesg.today $TMP >/dev/null 2>&1; then :; else
separator
echo "$host kernel log messages:"
diff -b $LOG/dmesg.today $TMP | egrep "^>"
mv $LOG/dmesg.today $LOG/dmesg.yesterday
mv $TMP $LOG/dmesg.today
fi
fi
rm -f $TMP
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