current_user versus current_role

hello

I used info from current_user for log. about some operations (who, when, 
..). What I can see, current_user is equal current_role function. I had 
problem with it, because user (if is member of any group role) can change 
his identity. example: peter is member of role users. But peter can do set 
role to users. From this moment I lost possibility of get identity if user, 
because current_user returns users and not peter. I can check it (if some 
user changed identity) ~ by exampl. test if role has login privilegia, and 
if not I can stop any operations.

But Is there some possibility get identity of user without impact of change 
of role? (default role?)

thank you
Pavel Stehule

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