114 lines
2.7 KiB
Bash
114 lines
2.7 KiB
Bash
#!/bin/sh -
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#
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# @(#)security 5.3 (Berkeley) 5/28/91
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# $Id: security,v 1.28 1999/01/01 17:37:33 billf Exp $
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#
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PATH=/sbin:/bin:/usr/bin
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LC_ALL=C; export LC_ALL
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separator () {
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echo ""
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echo ""
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}
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host=`hostname`
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echo "Subject: $host security check output"
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LOG=/var/log
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TMP=/var/run/_secure.$$
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umask 027
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echo "checking setuid files and devices:"
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# don't have ncheck, but this does the equivalent of the commented out block.
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# note that one of the original problem, the possibility of overrunning
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# the args to ls, is still here...
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#
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MP=`mount -t ufs | grep -v " nosuid" | sed 's;/dev/;&r;' | awk '{ print $3 }'`
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set $MP
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while test $# -ge 1; do
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mount=$1
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shift
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find $mount -xdev -type f \
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\( -perm -u+x -or -perm -g+x -or -perm -o+x \) \
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\( -perm -u+s -or -perm -g+s \) -print0
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done | xargs -0 -n 20 ls -lTd | sort +9 > $TMP
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if [ ! -f $LOG/setuid.today ] ; then
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separator
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echo "no $LOG/setuid.today"
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cp $TMP $LOG/setuid.today
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fi
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if cmp $LOG/setuid.today $TMP >/dev/null; then :; else
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separator
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echo "$host setuid diffs:"
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diff -b $LOG/setuid.today $TMP
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mv $LOG/setuid.today $LOG/setuid.yesterday
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mv $TMP $LOG/setuid.today
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fi
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separator
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echo "checking for uids of 0:"
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awk -F: '$3==0 {print $1,$3}' /etc/master.passwd
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separator
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echo "checking for passwordless accounts:"
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awk -F: '$2=="" {print $0}' /etc/master.passwd
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# show denied packets
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if ipfw -a l 2>/dev/null | egrep "deny|reset|unreach" > $TMP; then
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if [ ! -f $LOG/ipfw.today ] ; then
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separator
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echo "no $LOG/ipfw.today"
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cp $TMP $LOG/ipfw.today
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fi
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if cmp $LOG/ipfw.today $TMP >/dev/null; then :; else
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separator
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echo "$host denied packets:"
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diff -b $LOG/ipfw.today $TMP | egrep "^>"
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mv $LOG/ipfw.today $LOG/ipfw.yesterday
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mv $TMP $LOG/ipfw.today
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fi
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fi
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# show ipfw rules which have reached the log limit
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IPFW_LOG_LIMIT=`sysctl -n net.inet.ip.fw.verbose_limit 2> /dev/null`
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if [ $? -eq 0 ] && [ $IPFW_LOG_LIMIT -ne 0 ]; then
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ipfw -a l | grep " log " | perl -n -e \
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'/^\d+\s+(\d+)/; print if ($1 >= '$IPFW_LOG_LIMIT')' > $TMP
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if [ -s $TMP ]; then
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separator
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echo "ipfw log limit reached:"
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cat $TMP
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fi
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fi
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# show kernel log messages
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if dmesg 2>/dev/null > $TMP; then
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if [ ! -f $LOG/dmesg.today ] ; then
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separator
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echo "no $LOG/dmesg.today"
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cp $TMP $LOG/dmesg.today
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fi
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if cmp $LOG/dmesg.today $TMP >/dev/null 2>&1; then :; else
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separator
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echo "$host kernel log messages:"
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diff -b $LOG/dmesg.today $TMP | egrep "^>"
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mv $LOG/dmesg.today $LOG/dmesg.yesterday
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mv $TMP $LOG/dmesg.today
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fi
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fi
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# show login failures
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separator
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echo "$host login failures:"
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grep -i "login failure" $LOG/messages
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# show tcp_wrapper warning messages
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separator
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echo "$host refused connections:"
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grep -i "refused connect" $LOG/messages
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rm -f $TMP
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