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The cost to implement this suggestion would be high, and there is a work-around using the profile handle support as noted in other responses.
IBM Power Systems Development
IBM Power Systems Development
I'd like to agree with the suggestion you have already received, this is something we have implemented often and with great success.
Using the option to "Swap User profile" (Profile Handles) should work seamlessly in this implementation, and you will be able to lock it down better in 7.6 with the new functionality to restrict Impersonation (yet another name for the same thing, Swap user Profile, user profile handles, etc)
The main thing you should be mindful of, from a security Point of View, is ensuring you swap back to the original user profile asap, including during application abends and or user-requested termination (SysReq Option 2)
TTFN Brad
The Friendly Techie
Steve Bradshaw
IBM Champion, Member of CEAC, TD of i-UG.co.uk and Friendly Techie at RowtonIT.com
Have you looked at using user profile handles and building that into a wrapper of your SFTP process?
https://www.ibm.com/docs/en/i/7.4.0?topic=programs-example-using-profile-handles
The QWTSETP API was mentioned in a code400.com thread some years ago specifically addressing an SFTP issue.