Restrict Admin accounts by IP address

[jimhendo]

Hi Cacti Team,

I can see 2FA is due to be released in 1.3 but until then I really need to restrict Admin users from logging in with public IP addresses.

Is there anything I can add to auth.php to restrict specific users or Admin users to IP address ranges?

Searching through the forums there was a plugin created to restrict Guest users to IP addresses, but any help to apply restrictions to Admin users would be very much appreciated.
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