Hi Florian. You're right: what you describe is currently not possible in 
cosign. That doesn't mean it won't be, though. As a matter of fact, there's 
work underway at a university to add a feature to cosign that matches your 
scenario almost exactly. There's a chance this will be available in the 
relatively near future. Your input would be helpful as this feature is shaped.

Cosign's multifactor login support is more flexible than you might think. If a 
user logs in first, either simply by visiting the login page or by visiting a 
protected service requiring only one factor, and the user subsequently visits a 
service requiring additional factors, the weblogin server will demand only the 
factor(s) that have not yet been authenticated.

andrew



On Jan 8, 2013, at 7:03 AM, Florian Mueller <flo2muel...@gmail.com> wrote:

> Hi all,
> 
> I have set up kerberos and cosign to work correctly with username and 
> password. Now I'd
> like to setup two-factor authentication using google authenticator.
> 
> The setup should be like this:
> 
> 1) User is presented a login page with just username & password on it
> 2) User enters correct credentials
> 2.1) An additional factor gets called which determines the required 
> two-factor method
> for the user via LDAP or similar (database).
> 3) User is presented a login page with just the form field for auth-token.
> 4) User enters correct token and is authenticated.
> 
> Is it possible to achieve this? ATM I only see the possibility to enable the 
> two-factor
> auth based on CosignRequiresFactor and the user has to post all data (user, 
> password, token)
> inside one request, which is not handy when authentication methods may differ 
> between users.
> 
> Is there any way I can get something like this to work or is cosign the wrong 
> tool for such
> a setup?
> 
> Regards,
> Florian
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