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#!/bin/bash
#
# Basic security checking for suid files.
# Written by Vandoorselaere Yoann, <yoann@mandrakesoft.com>
#
if [ -f /etc/security/msec/security.conf ]; then
. /etc/security/msec/security.conf
else
exit 1
fi
if [ SECURITY_CHECK == "no" ]; then
exit 0
fi
# Modified filters coming from debian security scripts.
CS_NFSAFS='(nfs|afs|xfs|coda)'
CS_TYPES=' type (devpts|auto|proc|msdos|fat|vfat|iso9660|ncpfs|smbfs|'$CS_NFSAFS')'
CS_DEVS='^/dev/fd'
CS_DIRS='on /mnt'
FILTERS="$CS_TYPES|$CS_DEVS|$CS_DIRS"
DIR=`mount | grep -vE "$FILTERS" | cut -d ' ' -f3`
###
SUID_ROOT_TODAY="/var/log/security/suid_root.today"
SUID_ROOT_YESTERDAY="/var/log/security/suid_root.yesterday"
SUID_ROOT_DIFF="/var/log/security/suid_root.diff"
SUID_GROUP_TODAY="/var/log/security/suid_group.today"
SUID_GROUP_YESTERDAY="/var/log/security/suid_group.yesterday"
SUID_GROUP_DIFF="/var/log/security/suid_group.diff"
SUID_MD5_TODAY="/var/log/security/suid_md5.today"
SUID_MD5_YESTERDAY="/var/log/security/suid_md5.yesterday"
SUID_MD5_DIFF="/var/log/security/suid_md5.diff"
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"
WRITEABLE_TODAY="/var/log/security/writeable.today"
WRITEABLE_YESTERDAY="/var/log/security/writeable.yesterday"
WRITEABLE_DIFF="/var/log/security/writeable.diff"
UNOWNED_TODAY="/var/log/security/unowned.today"
UNOWNED_YESTERDAY="/var/log/security/unowned.yesterday"
UNOWNED_DIFF="/var/log/security/unowned.diff"
SECURITY_LOG="/var/log/security.log"
TMP="/tmp/secure.tmp"
if [ ! -d /var/log/security ]; then
mkdir /var/log/security
fi
chattr -a /var/log/security/ >& /dev/null
chattr -a /var/log/security/* >& /dev/null
rm -f ${TMP} ${SECURITY_TMP} >& /dev/null
### Functions ###
Syslog() {
if [ $SYS_LOG=="yes" ]; then
cat ${1} | while read line; do
/sbin/initlog --string="${line}"
done
fi
}
Ttylog() {
if [ $TTY_LOG=="yes" ]; then
for i in `w | grep -v "load\|TTY" | awk '{print $2}'` ; do
echo -e "$1" > /dev/$i
done
fi
}
##################
### New Suid root files detection
if [ ${CHECK_SUID_ROOT}=="yes" ]; then
if [ -f ${SUID_ROOT_TODAY} ]; then
mv ${SUID_ROOT_TODAY} ${SUID_ROOT_YESTERDAY}
fi
find ${DIR} -xdev -type f -perm +04000 -user root \
-printf "%8i %5m %3n %-10u %-10g %9s %t %h/%f\n" | sort > ${SUID_ROOT_TODAY}
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|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added suid root files : ${file}.\n" >> ${TMP}
done
grep '^-' ${SUID_ROOT_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed suid root files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### New Suid group files detection
if [ ${CHECK_SUID_GROUP} ]; then
if [ -f ${SUID_GROUP_TODAY} ]; then
mv ${SUID_GROUP_TODAY} ${SUID_GROUP_YESTERDAY}
fi
find ${DIR} -xdev -type f -perm +02000 \
-printf "%8i %5m %3n %-10u %-10g %9s %t %h/%f\n" | sort > ${SUID_GROUP_TODAY}
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|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added suid group files : ${file}.\n" >> ${TMP}
done
grep '^-' ${SUID_GROUP_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed suid group files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Writable files detection
if [ ${CHECK_WRITEABLE}=="yes" ]; then
if [ -f ${WRITEABLE_TODAY} ]; then
mv -f ${WRITEABLE_TODAY} ${WRITEABLE_YESTERDAY}
fi
find ${DIR} -xdev -type f -perm -2 -ls -print | sort > ${WRITEABLE_TODAY}
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|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added writables files : ${file}.\n" >> ${TMP}
done
grep '^-' ${WRITEABLE_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed writables files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Search Non Owned files
if [ ${CHECK_UNOWNED}=="yes" ]; then
if [ -f ${UNOWNED_TODAY} ]; then
mv -f ${UNOWNED_TODAY} ${UNOWNED_YESTERDAY}
fi
find ${DIR} -xdev -nouser -print -ls | sort > ${UNOWNED_TODAY}
if [ -f ${UNOWNED_YESTERDAY} ]; then
if ! diff -u ${UNOWNED_YESTERDAY} ${UNOWNED_TODAY} > ${UNOWNED_DIFF}; then
printf "\nSecurity Warning: the following files aren't owned by an user :\n" >> ${TMP}
grep '^+' ${UNOWNED_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added un-owned files : ${file}.\n" >> ${TMP}
done
grep '^-' ${UNOWNED_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed un-owned files : ${file}.\n" >> ${TMP}
done
fi
fi
find ${DIR} -xdev -nogroup -print -ls | sort >> ${UNOWNED_TODAY}
if [ -f ${UNOWNED_YESTERDAY} ]; then
if ! diff -u ${UNOWNED_YESTERDAY} ${UNOWNED_TODAY} > ${UNOWNED_DIFF}; then
printf "\nSecurity Warning: the following files aren't owned by a group :\n" >> ${TMP}
grep '^+' ${UNOWNED_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Added un-owned files : ${file}.\n" >> ${TMP}
done
grep '^-' ${UNOWNED_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Removed un-owned files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Md5 check for SUID root file
if [ ${CHECK_SUID_MD5}=="yes" ]; then
if [ -f ${SUID_MD5_TODAY} ]; then
mv ${SUID_MD5_TODAY} ${SUID_MD5_YESTERDAY}
fi
touch ${SUID_MD5_TODAY}
awk '{print $12}' ${SUID_ROOT_TODAY} |
while read line; do
md5sum ${line} >> ${SUID_MD5_TODAY}
done
if [ -f ${SUID_MD5_YESTERDAY} ]; then
if ! diff -u ${SUID_MD5_YESTERDAY} ${SUID_MD5_TODAY} > ${SUID_MD5_DIFF}; 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}
grep '^+' ${SUID_MD5_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $2}' | while read file; do
printf "\t\t- Changed ( added ) files : ${file}.\n" >> ${TMP}
done
grep '^-' ${SUID_MD5_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $2}' | while read file; do
printf "\t\t- Changed ( removed ) files : ${file}.\n" >> ${TMP}
done
fi
fi
fi
### Changed open port
if [ ${CHECK_OPEN_PORT}=="yes" ]; then
if [ -f ${OPEN_PORT_TODAY} ]; then
mv -f ${OPEN_PORT_TODAY} ${OPEN_PORT_YESTERDAY}
fi
netstat -pvlA inet > ${OPEN_PORT_TODAY};
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 a new port listening on your machine :\n" >> ${TMP}
grep '^+' ${OPEN_PORT_DIFF} | grep -vw "^+++ " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Opened ports : ${file}.\n" >> ${TMP}
done
grep '^-' ${OPEN_PORT_DIFF} | grep -vw "^--- " | sed 's|^.||' | awk '{print $12}' | while read file; do
printf "\t\t- Closed ports : ${file}.\n" >> ${TMP}
done
fi
fi
fi
######## Report ######
if [ -s ${TMP} ]; then
Syslog ${TMP}
Ttylog ${TMP}
cat ${TMP} >> ${SECURITY_LOG}
rm -f ${TMP}
fi
# We launch our other report engine :)
/etc/security/msec/cron-sh/security_check.sh
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