Use the source, Luke: https://github.com/duosecurity/duo_unix/blob/master/lib/duo.c#L478 https://github.com/duosecurity/duo_unix/blob/master/lib/duo.... Author

Use the source, Luke: https://github.com/duosecurity/duo_unix/blob/master/lib/duo.c#L478 https://github.com/duosecurity/duo_unix/blob/master/lib/duo.... Authorization is done by making a POST request to a Duo-controlled server. If the response is the string "allow", it lets you in; if it's "deny", it doesn't. Duo can make that server return whatever they want.