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![]() Protecting program libraries z/OS Security Server RACF Security Administrator's Guide SA23-2289-00 |
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Program libraries can be for public use or for private (limited) use. You designate a set of libraries as public by placing the libraries in the system link list concatenation, which is SYS1.LINKLIB and any program libraries concatenated to SYS1.LINKLIB through the use of the LNKLSTxx member of SYS1.PARMLIB. A private load library is one that is not in the system link list
or one that is explicitly accessed as a private library (even if in
the system link list) through:
For programs in a system link list library, the user generally
does not need access to the library itself, and you could grant the
user the following access authorities:
Note: Users do not need access to libraries in the link list
in order to run programs from them if they allow the system to load
their programs from the link list itself. However, users need access
to any library referenced as a private library (for example, using
a JOBLIB, STEPLIB, or the TSO/E CALL 'library-name(program_name)' command).
Even if you have users issuing the TSO/E CALL command, you can still
grant NONE authority to the library if they use a different form of
the command, CALL *(program_name).
This command instructs the system to find the program in the LNKLIST
or link-pack area without specifically accessing the library itself.
If the users cannot use that form of CALL, or need to reference the
library as part of JOBLIB or STEPLIB, you must treat the library as
a private library if you do not want the user inspecting the library
contents.
To protect a private library from a user viewing its content or copying programs from it, grant the user EXECUTE authority to the library itself through the DATASET profile that protects the library. For example, if you have a library named 'AAA.LIBRARY1', you could issue either of the following examples: Examples:
When EXECUTE authority is the highest access level that users have to a private load library, the library is known as an execute-controlled library. If some users have EXECUTE authority, and some have READ authority, the library is execute-controlled for some users and not for others. Guideline: In general, grant READ access rather than EXECUTE unless you have a strong need to prevent users from viewing the contents of a program library. Using EXECUTE requires that you keep the users' program execution environments clean, and requires more administrative effort and restrictions on how the users can access programs from the libraries. Restriction: If you want EXECUTE restrictions to apply to a user who has OPERATIONS authority, you must explicitly PERMIT that user or one of the user's groups to the DATASET profile with EXECUTE authority. UACC(EXECUTE) or ID(*) ACCESS(EXECUTE) does not make a library execute-controlled for a user with OPERATIONS authority. ![]() ![]() ![]() |
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