237 lines
6.4 KiB
Bash
237 lines
6.4 KiB
Bash
#!/bin/sh -
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#
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# Copyright (c) 2000 The FreeBSD Project
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# @(#)security 5.3 (Berkeley) 5/28/91
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# $FreeBSD$
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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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rc=0
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LOG=/var/log
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TMP=/var/run/_secure.$$
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separator () {
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echo ''
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echo ''
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}
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catmsgs() {
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find $LOG -name 'messages.*' -mtime -2 |
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sort -t. -r -n +1 -2 |
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xargs zcat -f
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[ -f $LOG/messages ] && cat $LOG/messages
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}
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sflag=FALSE ignore=
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while getopts as c
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do
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case "$c" in
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a) ignore="$ignore|^amd:";;
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s) sflag=TRUE;;
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esac
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done
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yesterday=`date -v-1d "+%b %e "`
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host=`hostname`
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[ $sflag = FALSE ] && echo "To: root@${host}"
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[ $sflag = FALSE ] && echo "Subject: ${host} security check output"
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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 problems, 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" | awk '{ print $3 }' | sort`
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set ${MP}
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while [ $# -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 -liTd | sort +10 > ${TMP}
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if [ ! -f ${LOG}/setuid.today ]; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "No ${LOG}/setuid.today"
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cp ${TMP} ${LOG}/setuid.today || rc=3
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fi
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if ! cmp ${LOG}/setuid.today ${TMP} >/dev/null; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "${host} setuid diffs:"
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diff -w ${LOG}/setuid.today ${TMP}
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mv ${LOG}/setuid.today ${LOG}/setuid.yesterday || rc=3
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mv ${TMP} ${LOG}/setuid.today || rc=3
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fi
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# Show changes in the way filesystems are mounted
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#
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[ -n "$ignore" ] && cmd="egrep -v ${ignore#|}" || cmd=cat
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if mount -p | $cmd > $TMP; then
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if [ ! -f $LOG/mount.today ]; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "No $LOG/mount.today"
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cp $TMP $LOG/mount.today || rc=3
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fi
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if ! cmp $LOG/mount.today $TMP >/dev/null 2>&1; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "$host changes in mounted filesystems:"
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diff -b $LOG/mount.today $TMP
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mv $LOG/mount.today $LOG/mount.yesterday || rc=3
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mv $TMP $LOG/mount.today || rc=3
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fi
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fi
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separator
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echo 'Checking for uids of 0:'
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n=$(awk -F: '/^#/ {next} $3==0 {print $1,$3}' /etc/master.passwd |
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tee /dev/stderr |
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sed -e '/^root 0$/d' -e '/^toor 0$/d' |
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wc -l)
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[ $n -gt 0 -a $rc -lt 1 ] && rc=1
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separator
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echo 'Checking for passwordless accounts:'
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n=$(awk -F: 'NF > 1 && $1 !~ /^[#+-]/ && $2=="" {print $0}' /etc/master.passwd |
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tee /dev/stderr | wc -l)
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[ $n -gt 0 -a $rc -lt 1 ] && rc=1
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# Show denied packets
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#
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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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[ $rc -lt 1 ] && rc=1
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separator
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echo "No ${LOG}/ipfw.today"
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cp ${TMP} ${LOG}/ipfw.today || rc=3
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fi
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if ! cmp ${LOG}/ipfw.today ${TMP} >/dev/null; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "${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 || rc=3
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mv ${TMP} ${LOG}/ipfw.today || rc=3
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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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#
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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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[ $rc -lt 1 ] && rc=1
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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 IPv6 denied packets
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#
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if ip6fw -a l 2>/dev/null | egrep "deny|reset|unreach" > ${TMP}; then
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if [ ! -f ${LOG}/ip6fw.today ]; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "No ${LOG}/ip6fw.today"
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cp ${TMP} ${LOG}/ip6fw.today || rc=3
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fi
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if ! cmp ${LOG}/ip6fw.today ${TMP} >/dev/null; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "${host} IPv6 denied packets:"
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diff -b ${LOG}/ip6fw.today ${TMP} | egrep "^>"
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mv ${LOG}/ip6fw.today ${LOG}/ip6fw.yesterday || rc=3
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mv ${TMP} ${LOG}/ip6fw.today || rc=3
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fi
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fi
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# Show ip6fw rules which have reached the log limit
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#
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IP6FW_LOG_LIMIT=`sysctl -n net.inet6.ip6.fw.verbose_limit 2> /dev/null`
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if [ $? -eq 0 ] && [ "${IP6FW_LOG_LIMIT}" -ne 0 ]; then
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ip6fw -a l | grep " log " | perl -n -e \
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'/^\d+\s+(\d+)/; print if ($1 >= '$IP6FW_LOG_LIMIT')' > ${TMP}
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if [ -s "${TMP}" ]; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo 'ip6fw 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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#
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if dmesg -a 2>/dev/null > ${TMP}; then
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if [ ! -f ${LOG}/dmesg.today ]; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "No ${LOG}/dmesg.today"
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cp ${TMP} ${LOG}/dmesg.today || rc=3
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fi
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if ! cmp ${LOG}/dmesg.today ${TMP} >/dev/null 2>&1; then
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[ $rc -lt 1 ] && rc=1
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separator
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echo "${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 || rc=3
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mv ${TMP} ${LOG}/dmesg.today || rc=3
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fi
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fi
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# Show login failures
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#
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separator
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echo "${host} login failures:"
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n=$(catmsgs | grep -ia "^$yesterday.*login failure" | tee /dev/stderr | wc -l)
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[ $n -gt 0 -a $rc -lt 1 ] && rc=1
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# Show tcp_wrapper warning messages
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#
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separator
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echo "${host} refused connections:"
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n=$(catmsgs | grep -i "^$yesterday.*refused connect" | tee /dev/stderr | wc -l)
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[ $n -gt 0 -a $rc -lt 1 ] && rc=1
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rm -f ${TMP}
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exit $rc
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