[gentoo-user] How to grant a CAP_NET_RAW capability to user?

[Grant Edwards <grant.b.edwards@gmail.com>]

How do you grant a capability (e.g. CAP_NET_RAW) to a user?

I've been googling and have found countless articles and blog posts
explaining what each capability is and how to grant capabilities to an
executable file.  While granting the capability to an executable does
work, that's not what I need to do for a couple different reasons.

I need to grant the capability to a user, not to the executable.

There were a couple vague references implying that you can configure
"login to grant the desired capabilities" when a user logs in, but
I've not found any documentation on how to do that.

I've tried editing /etc/security/capability.conf and adding the line

  cap_net_raw   <username>

But, that doesn't seem to have any effect (yes, I logged out and back
in again).

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