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#!/bin/bash
#
# Security level implementation...
# Writen by Vandoorselaere Yoann <yoann@mandrakesoft.com>
#
if [[ -f /usr/share/msec/lib.sh ]]; then
. /usr/share/msec/lib.sh
else
echo "Can't find /usr/share/msec/lib.sh, exiting."
exit 1
fi
# Log in append only mode
echo -e "Changing attribute of /var/log/* to append only...\n"
# All events logged on tty12
echo "Loging all messages on tty12 : "
AddRules "*.* /dev/tty12" /etc/syslog.conf
# Prevent all kind of connection except from localhost
echo "Denying all kind of connection except localhost : "
AddRules "ALL:ALL EXCEPT localhost:DENY" /etc/hosts.deny
# Login as root on the console allowed :
echo "Denying login as root (except on the console) :"
AddRules "tty1" /etc/securetty quiet
AddRules "tty2" /etc/securetty quiet
AddRules "tty3" /etc/securetty quiet
AddRules "tty4" /etc/securetty quiet
AddRules "tty5" /etc/securetty quiet
AddRules "tty6" /etc/securetty
# Security check
echo "Updating file check variable : "
echo -e "\t- Check security : yes."
AddRules "CHECK_SECURITY=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check important permissions : yes."
AddRules "CHECK_PERMS=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check suid root file : yes."
AddRules "CHECK_SUID_ROOT=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check suid root file integrity (backdoor check) : yes."
AddRules "CHECK_SUID_MD5=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check suid group file : yes."
AddRules "CHECK_SUID_GROUP=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check world writable file : yes."
AddRules "CHECK_WRITEABLE=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check unowned file : yes."
AddRules "CHECK_UNOWNED=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check promiscuous mode : yes."
AddRules "CHECK_PROMISC=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check listening port : yes."
AddRules "CHECK_OPEN_PORT=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check passwd file integrity : yes."
AddRules "CHECK_PASSWD=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Check shadow file integrity : yes."
AddRules "CHECK_SHADOW=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Security warning on tty : yes."
AddRules "TTY_WARN=yes" /etc/security/msec/security.conf quiet
echo -e "\t- Security warning by mail : yes."
AddRules "MAIL_WARN=yes" /etc/security/msec/security.conf quiet
AddRules "MAIL_USER=root" /etc/security/msec/security.conf quiet
echo -e "\t- Security warning in syslog : yes."
AddRules "SYSLOG_WARN=yes" /etc/security/msec/security.conf
# end security check
# Check every 1 minutes for promisc problem
echo "Adding promisc check in crontab (scheduled every minutes) :"
AddRules "*/1 * * * * root /usr/share/msec/promisc_check.sh" /etc/crontab
echo "Adding \"diff\" & \"global\" security check in crontab (scheduled every midnight) :"
AddRules "0 4 * * * root /usr/share/msec/security.sh" /etc/crontab
# Do you want a password ?
LiloUpdate;
echo -n "Running lilo to record new config : "
/sbin/lilo >& /dev/null
echo -e "done.\n"
# Server update
echo "Setting secure level variable to 4 :"
AddRules "SECURE_LEVEL=4" /etc/profile
AddRules "SECURE_LEVEL=4" /etc/zprofile
export SECURE_LEVEL=4
IFS="
"
echo -n "Disabling all service, except : {"
for service in `chkconfig --list | awk '{print $1}'`; do
if grep -qx ${service} /etc/security/msec/server.4; then
echo -n " ${service}"
fi
done
echo " } : "
for service in `chkconfig --list | awk '{print $1}'`; do
chkconfig --del "${service}"
if ! chkconfig --msec --add "${service}"; then
echo -e "\t- Services ${service} scheduled to be disabled at next boot."
fi
done
echo -e "done.\n";
# /etc/profile
echo "Setting umask to 022 (u=rw,g=rx) for root, 077 (u=rw) for user :"
AddRules "if [[ \${UID} == 0 ]]; then umask 022; else umask 077; fi" /etc/profile
AddRules "if [[ \${UID} == 0 ]]; then umask 022; else umask 077; fi" /etc/zprofile
echo "Adding \"normal\" PATH variable :"
AddRules "PATH=\$PATH:/usr/X11R6/bin:/usr/games" /etc/profile quiet
AddRules "export PATH SECURE_LEVEL" /etc/profile
AddRules "PATH=\$PATH:/usr/X11R6/bin:/usr/games" /etc/zprofile quiet
AddRules "export PATH SECURE_LEVEL" /etc/zprofile
if [[ -f /usr/lib/libsafe.so.1.2 ]]; then
echo "Enabling stack overflow protection :"
AddRules "export LD_PRELOAD=/usr/lib/libsafe.so.1.3" /etc/profile
AddRules "export LD_PRELOAD=/usr/lib/libsafe.so.1.3" /etc/zprofile
fi
# Do not boot on a shell
echo -n "Setting up inittab to deny any user to issue ctrl-alt-del : "
tmpfile=`mktemp /tmp/secure.XXXXXX`
cp /etc/inittab ${tmpfile}
cat ${tmpfile} | \
sed s'/\/bin\/bash --login/\/sbin\/mingetty tty1/' | \
sed s'/ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/ca::ctrlaltdel:\/sbin\/shutdown -a -t3 -r now/' > /etc/inittab
rm -f ${tmpfile}
echo "done."
# Group were modified in lib.sh...
grpconv
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