Tag Archives: citrix

Yubikeys and Citrix Web Interface

I’ve had a look at using yubikeys with the xenapp 5 web interface recently to enhance the security of external access to our systems. I’ve installed a yubiradius server on our ESX infrastructure and have it validating users correctly. The only issue is the odd way that the server handles passcodes. Sending simply the passcode on it’s own won’t work. Yubiradius will be unable to parse the key, as it attempts to split the string int “password” and “yubikey”. Now, as far as I can tell nothing happens to the actual password field. I’ve been logging on with my user name, password and in the passcode box I can enter any rubbish followed by the yubikey OTP. The server then parses this correctly and everything seems to be ok. So, in order that users don’t ahve to enter some rubbish before the OTP, I’ve written a short bit of java to prepend some rubbish to the passcode box and then sending the form.

You’ll need to find “login.js” on the server and add the following somewhere. The document.get element should be on a single line. Wrapped for readbility
function mangle()

Find the function “function setup_login_submit_keys()” and edit it so that it looks like this:
if (keynum == 13) { // enter key
return false;

This should work. As the yubikey has an “enter” at the end of it, then this will run the manglescript when the form is submitted with enter. It doesn’t do anything clever. It jsut adds the entered password before the yubikey OTP is sent. Seems to work fine for me.