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POCreating a custom authentication with Acegi/Spring Security
 

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    <p>I'm having trouble discovering exactly what I need to implement in order to use a custom authentication method with my web application using Spring Security. I have a Grails application with the Spring Security plugin that currently uses the standard user/password authentication with a browser form. This is working correctly. </p> <p>I need to implement a mechanism alongside of this that implements a type of <a href="http://en.wikipedia.org/wiki/Message_authentication_code" rel="noreferrer">MAC</a> authentication. If the HTTP request contains several parameters (e.g. a user identifier, timestamp, signature, etc.) I need to take those parameters, perform some hashing and signature/timestamp comparisons, and then authenticate the user.</p> <p>I'm not 100% sure where to start with this. What Spring Security classes do I need to extend/implement? I have read the <a href="http://www.acegisecurity.org/guide/springsecurity.html" rel="noreferrer">Reference Documentation</a> and have an okay understanding of the concepts, but am not really sure if I need a Filter or Provider or Manager, or where/how exactly to create <a href="http://static.springframework.org/spring-security/site/apidocs/org/springframework/security/Authentication.html" rel="noreferrer">Authentication</a> objects. I've messed around trying to extend <a href="http://static.springframework.org/spring-security/site/apidocs/org/springframework/security/ui/AbstractProcessingFilter.html" rel="noreferrer">AbstractProcessingFilter</a> and/or implement <a href="http://static.springframework.org/spring-security/site/apidocs/org/springframework/security/providers/AuthenticationProvider.html" rel="noreferrer">AuthenticationProvider</a>, but I just get caught up understanding how I make them all play nicely.</p>
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