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#!/bin/bash
# msec: network security checks
# check if we are run from main script
if [ -z "$MSEC_TMP" -o -z "$INFOS" -o -z "$SECURITY" -o -z "$DIFF" -o -z "$SECURITY_LOG" ]; then
# variables are set in security.sh and propagated to the subscripts
echo "Error: this check should be run by the main msec security check!"
echo " do not run it directly unless you know what you are doing."
return 1
fi
export OPEN_PORT_TODAY="/var/log/security/open_port.today"
OPEN_PORT_YESTERDAY="/var/log/security/open_port.yesterday"
OPEN_PORT_DIFF="/var/log/security/open_port.diff"
export FIREWALL_TODAY="/var/log/security/open_port.today"
FIREWALL_YESTERDAY="/var/log/security/open_port.yesterday"
FIREWALL_DIFF="/var/log/security/open_port.diff"
if [[ -f ${OPEN_PORT_TODAY} ]]; then
mv -f ${OPEN_PORT_TODAY} ${OPEN_PORT_YESTERDAY}
fi
if [[ -f ${FIREWALL_TODAY} ]]; then
mv -f ${FIREWALL_TODAY} ${FIREWALL_YESTERDAY}
fi
if [[ ${CHECK_OPEN_PORT} == yes ]]; then
netstat -pvlA inet,inet6 2> /dev/null > ${OPEN_PORT_TODAY};
fi
if [[ ${CHECK_FIREWALL} == yes ]]; then
iptables -L 2>/dev/null > ${FIREWALL_TODAY}
fi
### Changed open port
if [[ ${CHECK_OPEN_PORT} == yes ]]; then
if [[ -f ${OPEN_PORT_YESTERDAY} ]]; then
diff -u ${OPEN_PORT_YESTERDAY} ${OPEN_PORT_TODAY} 1> ${OPEN_PORT_DIFF}
if [ -s ${OPEN_PORT_DIFF} ]; then
printf "\nSecurity Warning: There are modifications for port listening on your machine :\n" >> ${DIFF}
grep '^+' ${OPEN_PORT_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Opened ports : ${file}\n"
done >> ${DIFF}
grep '^-' ${OPEN_PORT_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Closed ports : ${file}\n"
done >> ${DIFF}
fi
fi
fi
### Changed firewall
if [[ ${CHECK_FIREWALL} == yes ]]; then
if [[ -f ${FIREWALL_YESTERDAY} ]]; then
diff -u ${FIREWALL_YESTERDAY} ${FIREWALL_TODAY} 1> ${FIREWALL_DIFF}
if [ -s ${FIREWALL_DIFF} ]; then
printf "\nSecurity Warning: There are modifications for firewall configuration on your machine :\n" >> ${DIFF}
grep '^+' ${FIREWALL_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- New entries : ${file}\n"
done >> ${DIFF}
grep '^-' ${FIREWALL_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Removed entries : ${file}\n"
done >> ${DIFF}
fi
fi
fi
### Dump a list of open port.
if [[ ${CHECK_OPEN_PORT} == yes ]]; then
if [[ -s ${OPEN_PORT_TODAY} ]]; then
printf "\nThese are the ports listening on your machine :\n" >> ${INFOS}
cat ${OPEN_PORT_TODAY} >> ${INFOS}
fi
fi
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