Environment: running z/OS V2R1,  using profiles BPX.NEXT.USER and 
BPX.UNIQUE.USER, the BPXMODEL profile is set up correctly (with HOME as 
/u/&racuid), and all users are automount manged under /u/ and the system 
dynamically creates and mounts the OMVS user's file system.

New userid is added to RACF with no OMVS segment and neither it nor its GROUP 
is in any access list. 

Using an ssh client, I attempt to sign in to my z/OS host and it succeeds.  The 
userid now has an OMVS segment and a mounted file system. 

That's great for adding new users that are members of our IT department, etc. 
But there are thousands of non-IT userids that exist in RACF for business 
purposes (users of CICS or IMS, etc.) and they have been in RACF for years with 
no OMVS segment. These days, a lot of that access is via browser or TN3270 
clients on a PC of some type. A PC where an ssh client or putty could be used 
to attempt to access the z/OS host. 

Have I missed something? This seems to be a security issue to me. Other than 
going out and adding OMVS(NOUID) to a LOT of RACF USER profiles (which disables 
the dynamic creation of a new OMVS segment), what else is available to control 
this?     



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