Installation

Create the directory $MW_INSTALL_PATH/extensions/Yubikey and copy all files there.

Add the user mapping table, like this:

mysql -h yourdbhost -u youradminuser -p yourwikidb < yubikey_table.sql

Add the following line somewhere near the bottom of LocalSettings.php:

require_once("$IP/extensions/Yubikey/Yubikey.php");

Theoretically, that should work out of the box. However, you may want to consider setting some of the following variables.

• $wgYubikeyValidationBaseURL -- This is the base URL for the validation server that should be used. If not set, the default in php-yubico is used ('https://api.yubico.com/wsapi/verify' last I looked). [ NOTE: depending on the implementation of php-yubico, this may or may not work. If it doesn't, you're stuck with verifying with Yubico's validation server ]
• $wgYubikeyAPIId [REQUIRED!] -- The numeric API identity.
• $wgYubikeyAPIKey -- The API key corresponding to the API identity. May be an empty string, but that's not recommended from a security point of view.

Prerequisites

PEAR php-yubikey

Convert local user to use a Yubikey

There's no real functionality for that yet.