ASP.Net Identity 2, Two Factor Security Code timespan

问题

We are using 2FA with ASP.Net Identity 2 via email. This works fine most of the time but in some cases there are delays with the security code getting through to users email, the 6-minute window for the security code then becomes too short.

Is there a way of adjusting this time window for the 2FA code?

回答1:

I think you have to change the validity-timespan in the UserTokenProvider.

Try the following in your UserManager<TApplicationUser> implementation:

public static ApplicationUserManager Create(
    IdentityFactoryOptions<ApplicationUserManager> options,
    IOwinContext context)
{
    /* ...create the user store... */ 
    var manager = new ApplicationUserManager(userStore);

    /* ...all the other config stuff... */

    var dataProtectionProvider = options.DataProtectionProvider;

    if (dataProtectionProvider != null)
    {
        var tokenProvider = new DataProtectorTokenProvider<ApplicationUser>(dataProtectionProvider.Create("ASP.NET Identity"));

        // here's what you're looking for:
        tokenProvider.TokenLifespan = TimeSpan.FromMinutes(10);  

        manager.UserTokenProvider = tokenProvider;
    }

    return manager;
}

来源：https://stackoverflow.com/questions/28087302/asp-net-identity-2-two-factor-security-code-timespan