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#!/bin/bash
#
# Written by Vandoorselaere Yoann
#
if [[ -f /etc/security/msec/security.conf ]]; then
. /etc/security/msec/security.conf
else
echo "/etc/security/msec/security.conf don't exist."
exit 1
fi
if [[ ${CHECK_SECURITY} == no ]]; then
exit 0
fi
SECURITY_LOG="/var/log/security.log"
TMP=`mktemp /tmp/secure.XXXXXX`
### New Suid root files detection
if [[ ${CHECK_SUID_ROOT} == yes ]]; then
if [[ -f ${SUID_ROOT_YESTERDAY} ]]; then
if ! diff -u ${SUID_ROOT_YESTERDAY} ${SUID_ROOT_TODAY} > ${SUID_ROOT_DIFF}; then
printf "\nSecurity Warning: Change in Suid Root files found :\n" >> ${TMP}
grep '^+' ${SUID_ROOT_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly added suid root file : ${file}\n"
done >> ${TMP}
grep '^-' ${SUID_ROOT_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer present suid root file : ${file}\n"
done >> ${TMP}
fi
fi
fi
### New Sgid files detection
if [[ ${CHECK_SGID} == yes ]]; then
if [[ -f ${SGID_YESTERDAY} ]]; then
if ! diff -u ${SGID_YESTERDAY} ${SGID_TODAY} > ${SGID_DIFF}; then
printf "\nSecurity Warning: Changes in Sgid files found :\n" >> ${TMP}
grep '^+' ${SGID_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly added sgid file : ${file}\n"
done >> ${TMP}
grep '^-' ${SGID_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer present sgid file : ${file}\n"
done >> ${TMP}
fi
fi
fi
### Writable files detection
if [[ ${CHECK_WRITABLE} == yes ]]; then
if [[ -f ${WRITABLE_YESTERDAY} ]]; then
diff -u ${WRITABLE_YESTERDAY} ${WRITABLE_TODAY} > ${WRITABLE_DIFF}
if [ -s ${WRITABLE_DIFF} ]; then
printf "\nSecurity Warning: Change in World Writable Files found :\n" >> ${TMP}
grep '^+' ${WRITABLE_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly added writable file : ${file}\n"
done >> ${TMP}
grep '^-' ${WRITABLE_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer present writable file : ${file}\n"
done >> ${TMP}
fi
fi
fi
### Search Non Owned files
if [[ ${CHECK_UNOWNED} == yes ]]; then
if [[ -f ${UNOWNED_USER_YESTERDAY} ]]; then
diff -u ${UNOWNED_USER_YESTERDAY} ${UNOWNED_USER_TODAY} > ${UNOWNED_USER_DIFF}
if [ -s ${UNOWNED_USER_DIFF} ]; then
printf "\nSecurity Warning: the following files aren't owned by an user :\n" >> ${TMP}
grep '^+' ${UNOWNED_USER_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly added un-owned file : ${file}\n"
done >> ${TMP}
grep '^-' ${UNOWNED_USER_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer present un-owned file : ${file}\n"
done >> ${TMP}
fi
fi
if [[ -f ${UNOWNED_GROUP_YESTERDAY} ]]; then
diff -u ${UNOWNED_GROUP_YESTERDAY} ${UNOWNED_GROUP_TODAY} > ${UNOWNED_GROUP_DIFF}
if [ -s ${UNOWNED_GROUP_DIFF} ]; then
printf "\nSecurity Warning: the following files aren't owned by a group :\n" >> ${TMP}
grep '^+' ${UNOWNED_GROUP_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly added un-owned file : ${file}\n"
done >> ${TMP}
grep '^-' ${UNOWNED_GROUP_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer present un-owned file : ${file}\n"
done >> ${TMP}
fi
fi
fi
### Md5 check for SUID root fileg
if [[ ${CHECK_SUID_MD5} == yes ]]; then
ctrl_md5=0;
if [[ -f ${SUID_MD5_YESTERDAY} ]]; then
diff -u ${SUID_MD5_YESTERDAY} ${SUID_MD5_TODAY} > ${SUID_MD5_DIFF}
if [ -s ${SUID_MD5_DIFF} ]; then
grep '^+' ${SUID_MD5_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | awk '{print $2}' | while read file; do
if cat ${SUID_MD5_YESTERDAY} | awk '{print $2}' | grep -qw ${file}; then
if [[ ${ctrl_md5} == 0 ]]; then
printf "\nSecurity Warning: the md5 checksum for one of your SUID files has changed,\n" >> ${TMP}
printf "\tmaybe an intruder modified one of these suid binary in order to put in a backdoor...\n" >> ${TMP}
ctrl_md5=1;
fi
printf "\t\t- Checksum changed file : ${file}\n"
fi
done >> ${TMP}
fi
fi
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" >> ${TMP}
grep '^+' ${OPEN_PORT_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Opened ports : ${file}\n"
done >> ${TMP}
grep '^-' ${OPEN_PORT_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Closed ports : ${file}\n"
done >> ${TMP}
fi
fi
fi
### rpm database
if [[ ${CHECK_RPM} == yes ]]; then
if [[ -f ${RPM_QA_YESTERDAY} ]]; then
diff -u ${RPM_QA_YESTERDAY} ${RPM_QA_TODAY} > ${RPM_QA_DIFF}
if [ -s ${RPM_QA_DIFF} ]; then
printf "\nSecurity Warning: These packages have changed on the system :\n" >> ${TMP}
grep '^+' ${RPM_QA_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly installed package : ${file}\n"
done >> ${TMP}
grep '^-' ${RPM_QA_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer present package : ${file}\n"
done >> ${TMP}
fi
fi
if [[ -f ${RPM_VA_YESTERDAY} ]]; then
diff -u ${RPM_VA_YESTERDAY} ${RPM_VA_TODAY} > ${RPM_VA_DIFF}
if [ -s ${RPM_VA_DIFF} ]; then
printf "\nSecurity Warning: These files belonging to packages have changed of status on the system :\n" >> ${TMP}
grep '^+' ${RPM_VA_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly modified : ${file}\n"
done >> ${TMP}
grep '^-' ${RPM_VA_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer modified : ${file}\n"
done >> ${TMP}
fi
fi
if [[ -f ${RPM_VA_CONFIG_YESTERDAY} ]]; then
diff -u ${RPM_VA_CONFIG_YESTERDAY} ${RPM_VA_CONFIG_TODAY} > ${RPM_VA_CONFIG_DIFF}
if [ -s ${RPM_VA_CONFIG_DIFF} ]; then
printf "\nSecurity Warning: These config files belonging to packages have changed of status on the system :\n" >> ${TMP}
grep '^+' ${RPM_VA_CONFIG_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Newly modified : ${file}\n"
done >> ${TMP}
grep '^-' ${RPM_VA_CONFIG_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- No longer modified : ${file}\n"
done >> ${TMP}
fi
fi
fi
### Changed chkrootkit
if [[ ${CHECK_CHKROOTKIT} == yes ]]; then
if [[ -f ${CHKROOTKIT_YESTERDAY} ]]; then
diff -u ${CHKROOTKIT_YESTERDAY} ${CHKROOTKIT_TODAY} 1> ${CHKROOTKIT_DIFF}
if [ -s ${CHKROOTKIT_DIFF} ]; then
printf "\nSecurity Warning: There are modifications for chkrootkit results :\n" >> ${TMP}
grep '^+' ${CHKROOTKIT_DIFF} | grep -vw "^+++ " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Added : ${file}\n"
done >> ${TMP}
grep '^-' ${CHKROOTKIT_DIFF} | grep -vw "^--- " | sed 's|^.||'|sed -e 's/%/%%/g' | while read file; do
printf "\t\t- Removed : ${file}\n"
done >> ${TMP}
fi
fi
fi
######## Report ######
date=`date`
hostname=`hostname`
if [[ -s ${TMP} ]]; then
Syslog ${TMP}
Ttylog ${TMP}
echo -e "\n\n*** Diff Check, ${date} ***\n" >> ${SECURITY_LOG}
cat ${TMP} >> ${SECURITY_LOG}
Notifylog "MSEC has performed Diff Check on ${hostname} on ${date}. Changes in system security were detected and are available in ${SECURITY_LOG}."
else
Notifylog "MSEC has performed Diff Check on ${hostname} on ${date}. No changes were detected in system security."
fi
Maillog "[msec] *** Diff Check on ${hostname}, ${date} ***" "${TMP}"
if [[ -f ${TMP} ]]; then
rm -f ${TMP}
fi
|
