freebsd-skq/etc/security

#!/bin/sh -
#
#	@(#)security	5.3 (Berkeley) 5/28/91
#	$Id: security,v 1.30 1999/06/23 14:23:54 sheldonh Exp $
#
PATH=/sbin:/bin:/usr/bin
LC_ALL=C; export LC_ALL

separator () {
	echo ""
	echo ""
}

host=`hostname`
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 -F: '$3==0 {print $1,$3}' /etc/master.passwd

separator
echo "checking for passwordless accounts:"
awk -F: '$1 !~ /^\+/ && $2=="" {print $0}' /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

# show login failures
separator
echo "${host} login failures:"
grep -i "login failure" ${LOG}/messages

# show tcp_wrapper warning messages
separator
echo "${host} refused connections:"
grep -i "refused connect" ${LOG}/messages

rm -f ${TMP}