Safeguard Reference Manual (G06.29+, H06.08+, J06.03+)

Device and Subdevice Security Commands
Safeguard Reference Manual — 520618-030
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Device and Subdevice Access Authorities
to do. They are equal, in every way, to the primary owner. For example, they can
modify the Safeguard authorization records for any device or subdevice they own, and
they can access any device or subdevice for which they own the authorization record
when that device or subdevice has been FROZEN.
An owner can deny explicitly a local super ID any of the authorities implicitly granted to
the super ID (including OWNER) and have this denial actively enforced all of the time.
When a device or subdevice is under Safeguard protection, all the security attributes
are controlled by the Safeguard software for that device or subdevice.
When used with an ACL, the OWNER authority can always be specified for all devices
or subdevices protected by the Safeguard software. The OWNER authority is always
included when the * authority code is used. It can also be abbreviated as O for
simplicity.
With the Safeguard software, the owner of an authorization record can also be defined
as a network user. A network user who owns an authorization record can use the
Safeguard software from a remote node to control access (provided the user has
remote passwords set up between the two systems).
Device and Subdevice Access Authorities
The ACL for a device or subdevice can grant any combination of these access
authorities to users and user groups:
Device and Subdevice Access Authorization
When a process attempts to open a protected device or subdevice, the Safeguard
software checks the process group list and the ACL to determine whether READ or
WRITE authority is granted to the user identified by the process’s process accessor ID
(PAID). If that user has READ or WRITE authority, the open request is allowed to
complete successfully. If the user has neither READ nor WRITE authority, the open
request is rejected with a security violation error (file error 48).
The Safeguard software distinguishes between local and remote open requests. A
remote open request is made by a process that was started by a network user logged
on to a remote system. When a process is remote with respect to the device or
subdevice that it is attempting to open, the network user must also be granted remote
access. Otherwise, the Safeguard software rejects the open request with a security
violation error (file error 48).
For example, suppose a remote process with a PAID of 4,5 attempts to open a device
or subdevice. The device ACL must grant either READ or WRITE authority to \*.4,5,
READ Open a device or subdevice for input operations
WRITE Open a device or subdevice for output operations
OWNER Manage the authorization records