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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"
WRITABLE_TODAY=/var/log/security/writable.today
WRITABLE_YESTERDAY=/var/log/security/writable.yesterday
WRITABLE_DIFF=/var/log/security/writable.diff
UNOWNED_TODAY=/var/log/security/unowned.today
UNOWNED_YESTERDAY=/var/log/security/unowned.yesterday
UNOWNED_DIFF=/var/log/security/unowned.diff
if [ ! -d /var/log/security ]; then
mkdir /var/log/security
fi
chattr -a /var/log/security
### Functions ###
Syslog() {
if [ $SYS_LOG=="yes" ]; then
/sbin/initlog --string=$1
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 file 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 $SUID_ROOT_YESTERDAY $SUID_ROOT_TODAY > $SUID_ROOT_DIFF; then
Syslog "Change in Suid Root file found, please consult $SUID_ROOT_DIFF"
Ttylog "\\033[1;31mChange in Suid Root file found !\\033[0;39m"
Ttylog "\\033[1;31mPlease consult $SUID_ROOT_DIFF\\033[0;39m"
fi
fi
fi
#############################
### New Suid group file 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 $SUID_GROUP_YESTERDAY $SUID_GROUP_TODAY > $SUID_GROUP_DIFF; then
Syslog "Change in Suid Group file found, please consult $SUID_GROUP_DIFF"
Ttylog "\\033[1;31mChange in Suid Group file found !\\033[0;39m"
Ttylog "\\033[1;31mPlease consult $SUID_GROUP_DIFF\\033[0;39m"
fi
fi
fi
#############################
### Writable file detection ###
if [ $CHECK_WRITABLE=="yes" ]; then
if [ -f $WRITABLE_TODAY ]; then
mv $WRITABLE_TODAY $WRITABLE_YESTERDAY
fi
find $DIR -xdev -type f -perm -2 \
-ls -print | sort > $WRITABLE_TODAY
if [ -f $WRITABLE_YESTERDAY ]; then
if ! diff $WRITABLE_YESTERDAY $WRITABLE_TODAY > $WRITABLE_DIFF; then
Syslog "Change in World Writable File found, please consult $WRITABLE_DIFF"
Ttylog "\\033[1;31mChange in World Writable File found !\\033[0;39m"
Ttylog "\\033[1;31mPlease consult $WRITABLE_DIFF\\033[0;39m"
fi
fi
fi
#################################
### Search Un Owned file ###
if [ $CHECK_UNOWNED=="yes" ]; then
if [ -f $UNOWNED_TODAY ]; then
mv $UNOWNED_TODAY $UNOWNED_YESTERDAY
fi
find $DIR -xdev -nouser -o -nogroup -print \
-ls | sort > $UNOWNED_TODAY
if [ -f $UNOWNED_YESTERDAY ]; then
if ! diff $UNOWNED_YESTERDAY $UNOWNED_TODAY; then
Syslog "Change in Un-Owned file user/group, please consult $UNOWNED_DIFF"
Ttylog "\\033[1;31mChange in Un-Owned file user/group found !\\033[0;39m"
Ttylog "\\033[1;31mPlease consult $UNOWNED_DIFF\\033[0;39m"
fi
fi
fi
chattr +a /var/log/security
|
