>
> Depends on the daemon. Some are ossec, some are (one is?) ossecr, some
> are root. `ps auxww | grep ossec`
>
The reason I ask is because I want to get the ssh working to the router
without sending a password. I have this working for 'root', but
ossec is not running as root at this point and the ssh command is sitting
there waiting for a password to continue. Somehow I think I need
to copy key files in a .ssh directory for whatever user ossec is running
as. I am week on the whole issue of ssh and keys as I am sure you can
tell.
>
>
>
> Without looking at the script I'm guessing it doesn't want too many
> copies of the script to be modifying the firewall at the same time.
> It's easy to include a "lock" so that subsequent copies wait for the
> earlier copies to finish. Since you're going through a whole ssh
> session, I'm guessing each run of the script takes your system longer
> than most.
>
> It seems to run a lot better when I simply put both commands together in
> the one firewall-drop-sh script.
>
>
> >
> > If there is documentation on this, I would be happy to read it. Just
> point
> > me there.
> >
>
> Have you looked at the script? I don't think it's documented, but I
> don't think it's very complex either.
>
> Yes, I am looking at the script and trying to understand. I was just
> hoping there might
>
be some documentation that I could also look at.
#!/bin/s#!/bin/sh
# Adds an IP to the iptables drop list (if linux)
# Adds an IP to the ipfilter drop list (if solaris, freebsd or netbsd)
# Adds an IP to the ipsec drop list (if aix)
# Requirements: Linux with iptables, Solaris/FreeBSD/NetBSD with ipfilter
or AIX with IPSec
# Expect: srcip
# Author: Ahmet Ozturk (ipfilter and IPSec)
# Author: Daniel B. Cid (iptables)
# Author: cgzones
# Last modified: Oct 04, 2012
UNAME=`uname`
ECHO="/bin/echo"
GREP="/bin/grep"
IPTABLES=""
IP4TABLES="/sbin/iptables"
IP6TABLES="/sbin/ip6tables"
IPFILTER="/sbin/ipf"
if [ "X$UNAME" = "XSunOS" ]; then
IPFILTER="/usr/sbin/ipf"
fi
GENFILT="/usr/sbin/genfilt"
LSFILT="/usr/sbin/lsfilt"
MKFILT="/usr/sbin/mkfilt"
RMFILT="/usr/sbin/rmfilt"
ARG1=""
ARG2=""
RULEID=""
ACTION=$1
USER=$2
IP=$3
PWD=`pwd`
LOCK="${PWD}/fw-drop"
LOCK_PID="${PWD}/fw-drop/pid"
LOCAL=`dirname $0`;
cd $LOCAL
cd ../
filename=$(basename "$0")
LOG_FILE="${PWD}/../logs/active-responses.log"
echo "`date` $0 $1 $2 $3 $4 $5" >> ${LOG_FILE}
# Checking for an IP
if [ "x${IP}" = "x" ]; then
echo "$0: <action> <username> <ip>"
exit 1;
fi
case "${IP}" in
*:* ) IPTABLES=$IP6TABLES;;
*.* ) IPTABLES=$IP4TABLES;;
* ) echo "`date` Unable to run active response (invalid IP: '${IP}')."
>> ${LOG_FILE} && exit 1;;
esac
# This number should be more than enough (even if a hundred
# instances of this script is ran together). If you have
# a really loaded env, you can increase it to 75 or 100.
MAX_ITERATION="50"
# Lock function
lock()
{
i=0;
# Providing a lock.
while [ 1 ]; do
mkdir ${LOCK} > /dev/null 2>&1
MSL=$?
if [ "${MSL}" = "0" ]; then
# Lock aquired (setting the pid)
echo "$$" > ${LOCK_PID}
return;
fi
# Getting currently/saved PID locking the file
C_PID=`cat ${LOCK_PID} 2>/dev/null`
if [ "x" = "x${S_PID}" ]; then
S_PID=${C_PID}
fi
# Breaking out of the loop after X attempts
if [ "x${C_PID}" = "x${S_PID}" ]; then
i=`expr $i + 1`;
fi
# Sleep 1 after 10/25 interactions
if [ "$i" = "10" -o "$i" = "25" ]; then
sleep 1;
fi
i=`expr $i + 1`;
# So i increments 2 by 2 if the pid does not change.
# If the pid keeps changing, we will increments one
# by one and fail after MAX_ITERACTION
if [ "$i" = "${MAX_ITERATION}" ]; then
kill="false"
for pid in `pgrep -f "${filename}"`; do
if [ "x${pid}" = "x${C_PID}" ]; then
# Unlocking and exiting
kill -9 ${C_PID}
echo "`date` Killed process ${C_PID} holding lock." >>
${LOG_FILE}
kill="true"
unlock;
i=0;
S_PID="";
break;
fi
done
if [ "x${kill}" = "xfalse" ]; then
echo "`date` Unable kill process ${C_PID} holding lock." >>
${LOG_FILE}
# Unlocking and exiting
unlock;
exit 1;
fi
fi
done
}
# Unlock function
unlock()
{
rm -rf ${LOCK}
}
# Blocking IP
if [ "x${ACTION}" != "xadd" -a "x${ACTION}" != "xdelete" ]; then
echo "$0: invalid action: ${ACTION}"
exit 1;
fi
# We should run on linux
if [ "X${UNAME}" = "XLinux" ]; then
if [ "x${ACTION}" = "xadd" ]; then
ARG1="-I INPUT -s ${IP} -j DROP"
ARG2="-I FORWARD -s ${IP} -j DROP"
else
ARG1="-D INPUT -s ${IP} -j DROP"
ARG2="-D FORWARD -s ${IP} -j DROP"
fi
# Checking if iptables is present
if [ ! -x ${IPTABLES} ]; then
IPTABLES="/usr"${IPTABLES}
if [ ! -x ${IPTABLES} ]; then
echo "$0: can not find iptables"
exit 0;
fi
fi
# Executing and exiting
COUNT=0;
lock;
while [ 1 ]; do
${IPTABLES} ${ARG1}
sshpass -p 'password' ssh [email protected] iptables ${ARG1}
RES=$?
if [ $RES = 0 ]; then
break;
else
COUNT=`expr $COUNT + 1`;
echo "`date` Unable to run (iptables returning != $RES): $COUNT
- $0 $1 $2 $3 $4 $5" >> ${LOG_FILE}
sleep $COUNT;
if [ $COUNT -gt 4 ]; then
break;
fi
fi
done
COUNT=0;
while [ 1 ]; do
${IPTABLES} ${ARG2}
sshpass -p 'password' ssh [email protected] iptables ${ARG2}
RES=$?
if [ $RES = 0 ]; then
break;
else
COUNT=`expr $COUNT + 1`;
echo "`date` Unable to run (iptables returning != $RES): $COUNT
- $0 $1 $2 $3 $4 $5" >> ${LOG_FILE}
sleep $COUNT;
if [ $COUNT -gt 4 ]; then
break;
fi
fi
done
unlock;
exit 0;
# FreeBSD, SunOS or NetBSD with ipfilter
elif [ "X${UNAME}" = "XFreeBSD" -o "X${UNAME}" = "XSunOS" -o "X${UNAME}" =
"XNetBSD" ]; then
# Checking if ipfilter is present
ls ${IPFILTER} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if echo is present
ls ${ECHO} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
if [ "x${ACTION}" = "xadd" ]; then
ARG1="\"@1 block out quick from any to ${IP}\""
ARG2="\"@1 block in quick from ${IP} to any\""
IPFARG="${IPFILTER} -f -"
else
ARG1="\"@1 block out quick from any to ${IP}\""
ARG2="\"@1 block in quick from ${IP} to any\""
IPFARG="${IPFILTER} -rf -"
fi
# Executing it
eval ${ECHO} ${ARG1}| ${IPFARG}
eval ${ECHO} ${ARG2}| ${IPFARG}
exit 0;
# AIX with ipsec
elif [ "X${UNAME}" = "XAIX" ]; then
# Checking if genfilt is present
ls ${GENFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if lsfilt is present
ls ${LSFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if mkfilt is present
ls ${MKFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if rmfilt is present
ls ${RMFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
if [ "x${ACTION}" = "xadd" ]; then
ARG1=" -v 4 -a D -s ${IP} -m 255.255.255.255 -d 0.0.0.0 -M 0.0.0.0 -w B
-D \"Access Denied by OSSEC-HIDS\""
#Add filter to rule table
eval ${GENFILT} ${ARG1}
#Deactivate and activate the filter rules.
eval ${MKFILT} -v 4 -d
eval ${MKFILT} -v 4 -u
else
# removing a specific rule is not so easy :(
eval ${LSFILT} -v 4 -O | ${GREP} ${IP} |
while read -r LINE
do
RULEID=`${ECHO} ${LINE} | cut -f 1 -d "|"`
let RULEID=${RULEID}+1
ARG1=" -v 4 -n ${RULEID}"
eval ${RMFILT} ${ARG1}
done
#Deactivate and activate the filter rules.
eval ${MKFILT} -v 4 -d
eval ${MKFILT} -v 4 -u
fi
else
exit 0;
fi
# Adds an IP to the iptables drop list (if linux)
# Adds an IP to the ipfilter drop list (if solaris, freebsd or netbsd)
# Adds an IP to the ipsec drop list (if aix)
# Requirements: Linux with iptables, Solaris/FreeBSD/NetBSD with ipfilter
or AIX with IPSec
# Expect: srcip
# Author: Ahmet Ozturk (ipfilter and IPSec)
# Author: Daniel B. Cid (iptables)
# Author: cgzones
# Last modified: Oct 04, 2012
UNAME=`uname`
ECHO="/bin/echo"
GREP="/bin/grep"
IPTABLES=""
IP4TABLES="/sbin/iptables"
IP6TABLES="/sbin/ip6tables"
IPFILTER="/sbin/ipf"
if [ "X$UNAME" = "XSunOS" ]; then
IPFILTER="/usr/sbin/ipf"
fi
GENFILT="/usr/sbin/genfilt"
LSFILT="/usr/sbin/lsfilt"
MKFILT="/usr/sbin/mkfilt"
RMFILT="/usr/sbin/rmfilt"
ARG1=""
ARG2=""
RULEID=""
ACTION=$1
USER=$2
IP=$3
PWD=`pwd`
LOCK="${PWD}/fw-drop"
LOCK_PID="${PWD}/fw-drop/pid"
LOCAL=`dirname $0`;
cd $LOCAL
cd ../
filename=$(basename "$0")
LOG_FILE="${PWD}/../logs/active-responses.log"
echo "`date` $0 $1 $2 $3 $4 $5" >> ${LOG_FILE}
# Checking for an IP
if [ "x${IP}" = "x" ]; then
echo "$0: <action> <username> <ip>"
exit 1;
fi
case "${IP}" in
*:* ) IPTABLES=$IP6TABLES;;
*.* ) IPTABLES=$IP4TABLES;;
* ) echo "`date` Unable to run active response (invalid IP: '${IP}')."
>> ${LOG_FILE} && exit 1;;
esac
# This number should be more than enough (even if a hundred
# instances of this script is ran together). If you have
# a really loaded env, you can increase it to 75 or 100.
MAX_ITERATION="50"
# Lock function
lock()
{
i=0;
# Providing a lock.
while [ 1 ]; do
mkdir ${LOCK} > /dev/null 2>&1
MSL=$?
if [ "${MSL}" = "0" ]; then
# Lock aquired (setting the pid)
echo "$$" > ${LOCK_PID}
return;
fi
# Getting currently/saved PID locking the file
C_PID=`cat ${LOCK_PID} 2>/dev/null`
if [ "x" = "x${S_PID}" ]; then
S_PID=${C_PID}
fi
# Breaking out of the loop after X attempts
if [ "x${C_PID}" = "x${S_PID}" ]; then
i=`expr $i + 1`;
fi
# Sleep 1 after 10/25 interactions
if [ "$i" = "10" -o "$i" = "25" ]; then
sleep 1;
fi
i=`expr $i + 1`;
# So i increments 2 by 2 if the pid does not change.
# If the pid keeps changing, we will increments one
# by one and fail after MAX_ITERACTION
if [ "$i" = "${MAX_ITERATION}" ]; then
kill="false"
for pid in `pgrep -f "${filename}"`; do
if [ "x${pid}" = "x${C_PID}" ]; then
# Unlocking and exiting
kill -9 ${C_PID}
echo "`date` Killed process ${C_PID} holding lock." >>
${LOG_FILE}
kill="true"
unlock;
i=0;
S_PID="";
break;
fi
done
if [ "x${kill}" = "xfalse" ]; then
echo "`date` Unable kill process ${C_PID} holding lock." >>
${LOG_FILE}
# Unlocking and exiting
unlock;
exit 1;
fi
fi
done
}
# Unlock function
unlock()
{
rm -rf ${LOCK}
}
# Blocking IP
if [ "x${ACTION}" != "xadd" -a "x${ACTION}" != "xdelete" ]; then
echo "$0: invalid action: ${ACTION}"
exit 1;
fi
# We should run on linux
if [ "X${UNAME}" = "XLinux" ]; then
if [ "x${ACTION}" = "xadd" ]; then
ARG1="-I INPUT -s ${IP} -j DROP"
ARG2="-I FORWARD -s ${IP} -j DROP"
else
ARG1="-D INPUT -s ${IP} -j DROP"
ARG2="-D FORWARD -s ${IP} -j DROP"
fi
# Checking if iptables is present
if [ ! -x ${IPTABLES} ]; then
IPTABLES="/usr"${IPTABLES}
if [ ! -x ${IPTABLES} ]; then
echo "$0: can not find iptables"
exit 0;
fi
fi
# Executing and exiting
COUNT=0;
lock;
while [ 1 ]; do
${IPTABLES} ${ARG1}
sshpass -p '1604134' ssh [email protected] iptables ${ARG1}
RES=$?
if [ $RES = 0 ]; then
break;
else
COUNT=`expr $COUNT + 1`;
echo "`date` Unable to run (iptables returning != $RES): $COUNT
- $0 $1 $2 $3 $4 $5" >> ${LOG_FILE}
sleep $COUNT;
if [ $COUNT -gt 4 ]; then
break;
fi
fi
done
COUNT=0;
while [ 1 ]; do
${IPTABLES} ${ARG2}
sshpass -p '1604134' ssh [email protected] iptables ${ARG2}
RES=$?
if [ $RES = 0 ]; then
break;
else
COUNT=`expr $COUNT + 1`;
echo "`date` Unable to run (iptables returning != $RES): $COUNT
- $0 $1 $2 $3 $4 $5" >> ${LOG_FILE}
sleep $COUNT;
if [ $COUNT -gt 4 ]; then
break;
fi
fi
done
unlock;
exit 0;
# FreeBSD, SunOS or NetBSD with ipfilter
elif [ "X${UNAME}" = "XFreeBSD" -o "X${UNAME}" = "XSunOS" -o "X${UNAME}" =
"XNetBSD" ]; then
# Checking if ipfilter is present
ls ${IPFILTER} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if echo is present
ls ${ECHO} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
if [ "x${ACTION}" = "xadd" ]; then
ARG1="\"@1 block out quick from any to ${IP}\""
ARG2="\"@1 block in quick from ${IP} to any\""
IPFARG="${IPFILTER} -f -"
else
ARG1="\"@1 block out quick from any to ${IP}\""
ARG2="\"@1 block in quick from ${IP} to any\""
IPFARG="${IPFILTER} -rf -"
fi
# Executing it
eval ${ECHO} ${ARG1}| ${IPFARG}
eval ${ECHO} ${ARG2}| ${IPFARG}
exit 0;
# AIX with ipsec
elif [ "X${UNAME}" = "XAIX" ]; then
# Checking if genfilt is present
ls ${GENFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if lsfilt is present
ls ${LSFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if mkfilt is present
ls ${MKFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
# Checking if rmfilt is present
ls ${RMFILT} >> /dev/null 2>&1
if [ $? != 0 ]; then
exit 0;
fi
if [ "x${ACTION}" = "xadd" ]; then
ARG1=" -v 4 -a D -s ${IP} -m 255.255.255.255 -d 0.0.0.0 -M 0.0.0.0 -w B
-D \"Access Denied by OSSEC-HIDS\""
#Add filter to rule table
eval ${GENFILT} ${ARG1}
#Deactivate and activate the filter rules.
eval ${MKFILT} -v 4 -d
eval ${MKFILT} -v 4 -u
else
# removing a specific rule is not so easy :(
eval ${LSFILT} -v 4 -O | ${GREP} ${IP} |
while read -r LINE
do
RULEID=`${ECHO} ${LINE} | cut -f 1 -d "|"`
let RULEID=${RULEID}+1
ARG1=" -v 4 -n ${RULEID}"
eval ${RMFILT} ${ARG1}
done
#Deactivate and activate the filter rules.
eval ${MKFILT} -v 4 -d
eval ${MKFILT} -v 4 -u
fi
else
exit 0;
fi
--
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