MSC security and the Transaction Authorization exit routine

The Transaction Authorization exit routine (DFSCTRN0) works with the Security Reverification exit routine (DFSCTSE0) and the Signon/off Security exit routine (DFSCSGN0) to check an individual user ID for authority to use a transaction.

DFSCTRN0 can be used with or without RACF® to verify that the user ID is authorized to run a transaction. If both the RACF option and DFSCTRN0 are selected in the IMS system definition, the exit routine is activated after RACF verifies the transaction. If the transaction request is rejected by RACF, the exit routine is not called. If the RACF option is not selected in the IMS system definition, this exit routine can be used to verify the user's authorization and the password, if required, for that transaction.

Related reading: For more information about the Transaction Authorization exit routine (DFSCTRN0), see IMS Version 15.2 Exit Routines.