Plugin for Roundcube webmail for two-factor authentication, allowing the choice (per-account) of requiring YubiKey authentication in addition to standard password authentication. Note: this normally connects to a YubiKey API server over https. If your web server runs in a chroot jail, you must copy /etc/ssl/cert.pem (or another suitable certificate bundle) to /var/www/etc/ssl/cert.pem.
WWW: https://github.com/northox/roundcube-yubikey-plugin
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