HP OpenVMS Guide to System Security > Chapter 13 Using Protected Subsystems

Giving Users Access

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All users with execute access to the main application image of the subsystem can use the data files and other objects under control of the subsystem if the subsystem allows the access. However, managers of the subsystem can restrict access to objects of the subsystem in the following ways:

  • They can create special identifiers for resources belonging to the subsystem that they do not want all members to access and add ACEs to these resources.

  • They can use compound expressions in ACEs and thus grant access conditionally. For example, the following ACE grants access to MEMBERS_ADMIN when running MEMBERS_SUBSYSTEM but not to MEMBERS_ADMIN alone nor to other users holding the MEMBERS_SUBSYSTEM identifier:

    	(ID=MEMBERS_SUBSYSTEM+MEMBERS_ADMIN, ACCESS=READ+WRITE)

Remember that as long as users are executing the application image for the subsystem, their process rights list contains the subsystem identifier as well as their normal identifiers. However, as soon as users interrupt or exit from the application, their process rights list loses the subsystem identifier, and they lose access rights to the objects in the subsystem. Subsystem identifiers are not propagated by default when subprocesses are spawned.