[Openvpn-devel] [Patch] Support client reason from auth plugin

[Eric T. <er...@sp...>]

Hi All,

This patch allows for a client reason to be returned from an auth plugin 
and sent to the connecting client on an auth fail. This change is 
backwards compatible with existing plugins and hasn't caused issues with 
existing plugins like the included pam plugin in our testing. The main 
purpose of this change is to support dynamic challenge/response from 
plugins, currently this is only possible from the management interface.

Example usage for this change can be found in a new plugin here modified 
from the included PAM plugin - 
https://github.com/thesparklabs/openvpn-two-factor-extensions/tree/master/yubikey-u2f-pam-plugin

Regards,
Eric

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Eric Thorpe
SparkLabs Developer
https://www.sparklabs.com
https://twitter.com/sparklabs
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