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#!/bin/bash
#
# Written by Vandoorselaere Yoann, <yoann@mandrakesoft.com>
#
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`
### Functions ###
Syslog() {
if [[ ${SYSLOG_WARN} == yes ]]; then
cat ${1} | while read line; do
/sbin/initlog --string="${line}"
done
fi
}
Ttylog() {
if [[ ${TTY_WARN} == yes ]]; then
for i in `w | grep -v "load\|TTY" | awk '{print $2}'` ; do
cat ${1} > /dev/$i
done
fi
}
##################
### 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|^.||' | while read file; do
printf "\t\t- Added suid root files : ${file}\n"
done >> ${TMP}
grep '^-' ${SUID_ROOT_DIFF} | grep -vw "^--- " | sed 's|^.||' | while read file; do
printf "\t\t- Removed suid root files : ${file}\n"
done >> ${TMP}
fi
fi
fi
### New Suid group files detection
if [[ ${CHECK_SUID_GROUP} == yes ]]; then
if [[ -f ${SUID_GROUP_YESTERDAY} ]]; then
if ! diff -u ${SUID_GROUP_YESTERDAY} ${SUID_GROUP_TODAY} > ${SUID_GROUP_DIFF}; then
printf "\nSecurity Warning: Changes in Suid Group files found :\n" >> ${TMP}
grep '^+' ${SUID_GROUP_DIFF} | grep -vw "^+++ " | sed 's|^.||' | while read file; do
printf "\t\t- Added suid group files : ${file}\n"
done >> ${TMP}
grep '^-' ${SUID_GROUP_DIFF} | grep -vw "^--- " | sed 's|^.||' | while read file; do
printf "\t\t- Removed suid group files : ${file}\n"
done >> ${TMP}
fi
fi
fi
### Writable files detection
if [[ ${CHECK_WRITEABLE} == yes ]]; then
if [[ -f ${WRITEABLE_YESTERDAY} ]]; then
if ! diff -u ${WRITEABLE_YESTERDAY} ${WRITEABLE_TODAY} > ${WRITEABLE_DIFF}; then
printf "\nSecurity Warning: Change in World Writeable Files found :\n" >> ${TMP}
grep '^+' ${WRITEABLE_DIFF} | grep -vw "^+++ " | sed 's|^.||' | while read file; do
printf "\t\t- Added writables files : ${file}\n"
done >> ${TMP}
grep '^-' ${WRITEABLE_DIFF} | grep -vw "^--- " | sed 's|^.||' | while read file; do
printf "\t\t- Removed writables files : ${file}\n"
done >> ${TMP}
fi
fi
fi
### Search Non Owned files
if [[ ${CHECK_UNOWNED} == yes ]]; then
if [[ -f ${UNOWNED_USER_YESTERDAY} ]]; then
if ! diff -u ${UNOWNED_USER_YESTERDAY} ${UNOWNED_USER_TODAY} > ${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|^.||' | while read file; do
printf "\t\t- Added un-owned files : ${file}\n"
done > ${TMP}
grep '^-' ${UNOWNED_USER_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed un-owned files : ${file}\n"
done >> ${TMP}
fi
fi
if [[ -f ${UNOWNED_GROUP_YESTERDAY} ]]; then
if ! diff -u ${UNOWNED_GROUP_YESTERDAY} ${UNOWNED_GROUP_TODAY} > ${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|^.||' | while read file; do
printf "\t\t- Added un-owned files : ${file}\n"
done >> ${TMP}
grep '^-' ${UNOWNED_GROUP_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed un-owned files : ${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
if ! diff -u ${SUID_MD5_YESTERDAY} ${SUID_MD5_TODAY} > ${SUID_MD5_DIFF}; then
grep '^+' ${SUID_MD5_DIFF} | grep -vw "^+++ " | sed 's|^.||' | 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 files : ${file}\n"
fi
done >> ${TMP}
fi
fi
fi
### Changed open port
if [[ ${CHECK_OPEN_PORT} == yes ]]; then
if [[ -f ${OPEN_PORT_YESTERDAY} ]]; then
if ! diff -u ${OPEN_PORT_YESTERDAY} ${OPEN_PORT_TODAY} 1> ${OPEN_PORT_DIFF}; then
printf "\nSecurity Warning: There is modifications for port listening on your machine :\n" >> ${TMP}
grep '^+' ${OPEN_PORT_DIFF} | grep -vw "^+++ " | sed 's|^.||' | while read file; do
printf "\t\t- Opened ports : ${file}\n"
done >> ${TMP}
grep '^-' ${OPEN_PORT_DIFF} | grep -vw "^--- " | sed 's|^.||' | while read file; do
printf "\t\t- Closed ports : ${file}\n"
done >> ${TMP}
fi
fi
fi
######## Report ######
if [[ -s ${TMP} ]]; then
Syslog ${TMP}
Ttylog ${TMP}
date=`date`
echo -e "\n\n*** Diff Check, ${date} ***\n" >> ${SECURITY_LOG}
cat ${TMP} >> ${SECURITY_LOG}
fi
if [[ -f ${TMP} ]]; then
rm -f ${TMP}
fi
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