HP OpenVMS Systems Documentation
HP OpenVMS DCL Dictionary
Enables or disables specified user privileges. The F$SETPRV function returns a list of keywords indicating user privileges; this list shows the status of the specified privileges before F$SETPRV was executed.
A character string containing keywords for the current process privileges before they were changed by the F$SETPRV function.
The lexical function F$SETPRV invokes the $SETPRV system service to enable or disable specified user privileges. The F$SETPRV function returns a list of keywords indicating user privileges; this list shows the status of the specified privileges before F$SETPRV was executed.
$ OLDPRIV = F$SETPRV("OPER,NOTMPMBX") $ SHOW SYMBOL OLDPRIV OLDPRIV = "NOOPER,TMPMBX"
In this example, the process is authorized to change the OPER (operator) and TMPMBX (temporary mailbox) privileges. The F$SETPRV function enables the OPER privilege and disables the TMPMBX privilege. In addition, the F$SETPRV function returns the keywords NOOPER and TMPMBX, showing the state of these privileges before they were changed.
You must place quotation marks (" ") around the list of privilege keywords because it is a string literal.
$ SHOW PROCESS/PRIVILEGE 05-JUN-2001 15:55:09.60 RTA1: User: HELRIEGEL Process privileges: Process rights identifiers: INTERACTIVE LOCAL $ NEWPRIVS = F$SETPRV("ALL, NOOPER") $ SHOW SYMBOL NEWPRIVS NEWPRIVS = "NOCMKRNL,NOCMEXEC,NOSYSNAM,NOGRPNAM,NOALLSPOOL, NOIMPERSONATE,NODIAGNOSE,NOLOG_IO,NOGROUP,NOACNT,NOPRMCEB, NOPRMMBX,NOPSWAPM,NOALTPRI,NOSETPRV,NOTMPMBX,NOWORLD,NOMOUNT, NOOPER,NOEXQUOTA,NONETMBX,NOVOLPRO,NOPHY_IO,NOBUGCHK,NOPRMGBL, NOSYSGBL,NOPFNMAP,NOSHMEM,NOSYSPRV,NOBYPASS,NOSYSLCK,NOSHARE, NOUPGRADE,NODOWNGRADE,NOGRPPRV,NOREADALL,NOSECURITY,OPER" $ SHOW PROCESS/PRIVILEGE 05-JUN-2001 10:21:18.32 User: INAZU Process ID: 00000F24 Node: TOKNOW Process name: "_FTA23:" Authorized privileges: NETMBX SETPRV SYSPRV TMPMBX Process privileges: ACNT may suppress accounting messages ALLSPOOL may allocate spooled device ALTPRI may set any priority value AUDIT may direct audit to system security audit log BUGCHK may make bug check log entries BYPASS may bypass all object access controls CMEXEC may change mode to exec CMKRNL may change mode to kernel DIAGNOSE may diagnose devices DOWNGRADE may downgrade object secrecy EXQUOTA may exceed disk quota GROUP may affect other processes in same group GRPNAM may insert in group logical name table GRPPRV may access group objects via system protection IMPERSONATE may impersonate another user IMPORT may set classification for unlabeled object LOG_IO may do logical i/o MOUNT may execute mount acp function NETMBX may create network device OPER may perform operator functions PFNMAP may map to specific physical pages PHY_IO may do physical i/o PRMCEB may create permanent common event clusters PRMGBL may create permanent global sections PRMMBX may create permanent mailbox PSWAPM may change process swap mode READALL may read anything as the owner SECURITY may perform security administration functions SETPRV may set any privilege bit SHARE may assign channels to non-shared devices SHMEM may create/delete objects in shared memory SYSGBL may create system wide global sections SYSLCK may lock system wide resources SYSNAM may insert in system logical name table SYSPRV may access objects via system protection TMPMBX may create temporary mailbox UPGRADE may upgrade object integrity VOLPRO may override volume protection WORLD may affect other processes in the world Process rights: INTERACTIVE LOCAL System rights: SYS$NODE_TOKNOW $ NEWPRIVS = F$SETPRV(NEWPRIVS) $ SHOW PROCESS/PRIVILEGE 05-JUN-2001 16:05:07.23 RTA1: User: JERROM Process privileges: OPER operator privilege Process rights identifiers: INTERACTIVE LOCAL
In this example, the DCL command SHOW PROCESS/PRIVILEGE is used to determine the current process privileges. Note that the process has no privileges enabled.
The F$SETPRV function is then used to process the ALL keyword and enable all privileges recording the previous state of each privilege in the symbol NEWPRIVS. Next, F$SETPRV processes the NOOPER keyword and disables the OPER (operator) privilege, recording the previous state of OPER in NEWPRIVS. Note that the OPER privilege appears in the returned string twice: first as NOOPER and then as OPER.
Entering the command SHOW PROCESS/PRIVILEGE now shows that the current process has all privileges enabled except OPER.
If the returned string is used as the parameter to F$SETPRV, the process has the OPER privilege enabled. This occurs because the OPER command was present twice in the symbol NEWPRIVS. As a result, F$SETPRV looked at the first keyword NOOPER and disabled the privilege. Finally, after processing several other keywords in the NEWPRIVS string, the OPER keyword is presented, allowing F$SETPRV to enable the OPER privilege.
If you are using the ALL or NOALL keywords to save your current privilege environment, HP recommends that you perform the following procedure to modify the process for a command procedure:
$ CURRENT_PRIVS = F$SETPRV("ALL") $ TEMP = F$SETPRV("NOOPER")
If you use this procedure, you can then specify the following command statement at the end of your command procedure so that the original privilege environment is restored:
$ TEMP = F$SETPRV(CURRENT_PRIVS)
$ SAVPRIV = F$SETPRV("NOGROUP") $ SHOW SYMBOL SAVPRIV SAVPRIV = "GROUP" $ TEST = F$PRIVILEGE("GROUP") $ SHOW SYMBOL TEST TEST = "TRUE"
In this example, the process is not authorized to change the GROUP privilege; however, the F$SETPRV function still returns the current setting for the GROUP privilege.
The F$PRIVILEGE function is used to see whether the process has GROUP privilege. The return string, TRUE, indicates that the process has GROUP privilege, even though the F$SETPRV function attempted to disable the privilege.