The security administrator creates security policies to enforce the labeling scheme.
The security administrator realizes that anyone with a clearance that includes the word REGISTERED can access any registered information anywhere in the company. Further precautions are needed. For example, users who have REGISTERED in their clearance must be instructed to use UNIX permissions to protect their files. Permissions should be set so that only the creator can look at or modify the file. The following example shows a user who is applying discretionary access control to protect the contents of a REGISTERED directory.
% plabel REGISTERED % mkdir registered.dir % chmod 700 registered.dir % cd registered.dir % touch registered.file % ls -l -rwxrwxrwx registered.file % chmod 600 registered.file % ls -l -rw------- registered.file |
As shown in the example, the user who creates a file or directory while working at an sensitivity label of REGISTERED needs to set the file's permissions to be read and write for the owner only. Directory permissions are set to be readable, writable, and searchable only by the owner. These permissions ensure that another user who can work at REGISTERED cannot read the file.
The following table shows how printers that are available to various work groups need to be configured.
Table 6–1 Printer Label Range Example Settings in Various Locations
Printer Location |
Type of Access |
Label Range |
---|---|---|
Lobby or public meeting room |
Anyone |
PUBLIC to PUBLIC |
Internal company printer room |
Available to all employees and others who have signed nondisclosure agreements |
PUBLIC to INTERNAL_USE_ONLY |
Restricted area for one group |
Members of group specified in the NEED_TO_KNOW group-name compartment |
NEED_TO_KNOW group-name to NEED_TO_KNOW group-name |
Strictly controlled area |
Available only to people who have the REGISTERED classification in their clearance |
REGISTERED to REGISTERED |
People who have access to restricted printers will be instructed to do the following:
Protect information according to the instructions on the printer banner and trailer pages.
Shred jobs that do not have both a banner and a trailer page. Also shred jobs that do not have matching job numbers on the banner and trailer pages.