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c# - How to setup password expiration using ASP.NET Identity Framework

I have a ASP.NET project using Identity. For Identity Configuration regarding passwords, the PasswordValidator is being used. How do I expand the enforcement of password beyond what PasswordValidator has currently (RequiredLength, RequiredDigit, etc.) to satisfy a requirement that asks for password expiration after N days?

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There is no such functionality builtin ASP.NET Identity 2. Easiest is to add a field on the user like LastPasswordChangedDate. And then check this field during each Authorization.

public class ApplicationOAuthProvider : OAuthAuthorizationServerProvider
{
    public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
    {
        var user = await GetUser(context.UserName, context.Password);
        if(user.LastPasswordChangedDate.AddDays(20) < DateTime.Now)
           // user needs to change password

    }
}

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