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****************************
Security level 1 :
- Global security check.
- umask is 002 ( user = read,write | greoup = read,write | other = read )
- easy file permission.
- localhost authorized to connect to X display.
- User in audio group.
- . in $PATH
- Warning in /var/log/security.log
****************************
Security level 2 :
- Global security check
- Suid root file check
- Suid root file md5sum check
- Writeable file check
- Warning in syslog
- Warning in /var/log/security.log
- umask is 022 ( user = read,write | group = read | other = read )
- easy file permission.
- localhost authorized to connect to X display.
- User in audio group.
****************************
Security level 3 ( Aka normal system ) :
- Global security check
- Permissions check
- Suid root file check
- Suid root file md5sum check
- Suid group file check
- Writeable file check
- Unowned file check
- Promiscuous check
- Listening port check
- Passwd file integrity check
- Shadow file integrity check
- Warning in syslog
- Warning in /var/log/security.log
- umask is 022 ( user = read,write | group = read | other = read )
- Normal file permission.
- All system events additionally logged to /dev/tty12
- Some system security check launched every midnight from the ( crontab ).
****************************
Security level 4 ( Aka Secured system ) :
- Global security check
- Permissions check
- Suid root file check
- Suid root file md5sum check
- Suid group file check
- Writeable file check
- Unowned file check
- Promiscuous check
- Listening port check
- Passwd file integrity check
- Shadow file integrity check
- Warning in syslog
- Warning in /var/log/security.log
- Warning directly on tty
- umask 022 ( user = read,write | group = read | other = read ) for root
- umask 077 ( user = read,write | group = | other = ) for normal users
- restricted file permissions.
- All system events additionally logged to /dev/tty12
- System security check every midnight ( crontab ).
* - Services not contained in /etc/security/msec/server.4 are disabled (
considered as not really secure ) ( but the user can reenable it with
chkconfig ).
- Ask for a boot password ( if the user want ).
- Connection to the system denyied for all except localhost.
- ctrl-alt-del only allowed for root ( or user in /etc/shutdown.allow ).
*******************************
Security level 5 ( Aka Paranoid system ) :
- Global security check
- Permissions check
- Suid root file check
- Suid root file md5sum check
- Suid group file check
- Writeable file check
- Unowned file check
- Promiscuous check
- Listening port check
- Passwd file integrity check
- Shadow file integrity check
- Warning in syslog
- Warning in /var/log/security.log
- Warning directly on tty
- umask 077 ( user = read,write | group = | other = )
- Highly restricted file permission
- All system events additionally logged to /dev/tty12
- System security check every midnight ( crontab ).
- Services not contained in /etc/security/msec/server.5 are disabled (
considered as not really secure ) ( but the user can reenable it with
chkconfig ).
- Ask for a boot password ( if the user want ).
- Connection to the system denyied for all.
- ctrl-alt-del only allowed for root ( or user in /etc/shutdown.allow ) .
******************
* level4/level5 : "services disabled" explanations :
- Some server aren't really considered as secure,
these one, should for exemple be compiled from sources.
server considered as secure are specified in /etc/security/msec/server.4/5
When enabling level4/5, all server which aren't considered as secure are
disabled ( NOT uninstalled, just disabled ) user can reenable them using the
chkconfig utility ( server will be launched at next boot ).
In these level, we are also denying rpm to enable any server considered as insecure
( off course rpm can install the server ).
The user have the choise : chkconfig --add servername will enable the server.
Or add the server in the secured server list
*** Future Release : ***
- Automatic tty locking ( unlock by passwd ) after X time of inactivity.
- In high security level, only user having access to group "sugrp" can use the su command.
***
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