for the "from anywhere" part, just use .+ as the host regexp. the
"anyone" part also doesn't really apply: the files don't affect who
can connect or read things, just what the mapping is done as (iirc,
world readable is still world readable). if you just want to not
bother with the passwd and group files and don't care about getting
nice names in, i think (but it's been a few years) you can just point
those at empty files.

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