Hi! In my testing it appears that a user need only be in one for the roles 
assigned to a layer in order to be granted access to the layer. This appears to 
be nominal behavior based on the current documentation: 
https://docs.geoserver.org/stable/en/user/security/layer.html : "If a user 
belongs to multiple roles, the least restrictive permission they inherit will 
apply.”

I would like to try a test and change the code to require the user to have all 
of the roles on the layer instead of just one of them. I would very much 
appreciate it if someone can help me identify the code that is responsible for 
this. I’m not familiar with the code base so I was just looking through and 
found a couple things that look promising but I’m not sure if these control 
layer access or not.

Things I came across and suspect are relevant (but not sure): 
- SecureTreeNode.java : public boolean canAccess(Authentication user, 
AccessMode mode)
- SecuredLookupServiceImpl.java : private boolean canAccess(Secured sec)

Any help would be very much appreciated! I just need to identify the relevant 
code for this functionality.

Note - I’m using the 2.18.1 version released on source forge 23NOV2020.

Thanks!
-Andy



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