Using spring security to handle pre-authenticated user.

-----------security-config.xml using special filter
 
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:sec="http://www.springframework.org/schema/security"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
                        http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-2.0.4.xsd">
 
    <bean id="springSecurityFilterChain" class="org.springframework.security.util.FilterChainProxy">
        <sec:filter-chain-map path-type="ant">
            <sec:filter-chain pattern="/**" filters="sif,preAuthenticatedProcessingFilter,logoutFilter,fsi"/>
        </sec:filter-chain-map>
    </bean>
 
    <!-- Filter # 1 -->
    <bean id="sif" class="org.springframework.security.context.HttpSessionContextIntegrationFilter"/>
 
    <sec:authentication-manager alias="authenticationManager" />
 
    <sec:authentication-provider user-service-ref='userDetailsService'/>
 
    <bean id="userDetailsService" class="com.cisco.btd.security.BtdUserDetailsService">
        <property name="userService" ref="userService"/>
    </bean>
    
    <bean id="preAuthenticatedProcessingFilter" class="com.cisco.btd.security.PreAuthenticatedProcessingFilter">
        <sec:custom-filter position="PRE_AUTH_FILTER" />
        <property name="authenticationManager" ref="authenticationManager" />
    </bean>
 
    <bean id="preAuthenticatedAuthenticationProvider" class="org.springframework.security.providers.preauth.PreAuthenticatedAuthenticationProvider">
        <sec:custom-authentication-provider />
        <property name="preAuthenticatedUserDetailsService">
            <bean id="userDetailsServiceWrapper" class="org.springframework.security.userdetails.UserDetailsByNameServiceWrapper">
                <property name="userDetailsService" ref="userDetailsService" />
            </bean>
        </property>
    </bean>
    
    <!-- Handle logout -->
    <bean id="logoutFilter" class="org.springframework.security.ui.logout.LogoutFilter">
        <constructor-arg value="/"/>
        <constructor-arg>
            <list>
                <bean class="org.springframework.security.ui.logout.SecurityContextLogoutHandler"/>
            </list>
        </constructor-arg>
    </bean>
 
    <bean id="httpRequestAccessDecisionManager" class="org.springframework.security.vote.AffirmativeBased">
        <property name="allowIfAllAbstainDecisions" value="false"/>
        <property name="decisionVoters">
            <list>
                <ref bean="roleVoter"/>
            </list>
        </property>
    </bean>
 
    <bean id="fsi" class="org.springframework.security.intercept.web.FilterSecurityInterceptor">
        <property name="authenticationManager" ref="authenticationManager"/>
        <property name="accessDecisionManager" ref="httpRequestAccessDecisionManager"/>
        <property name="objectDefinitionSource">
            <sec:filter-invocation-definition-source>
                <sec:intercept-url pattern='/system/**' access='ROLE_SUPER' />
                <sec:intercept-url pattern='/admin/**' access='ROLE_ADMIN' />
                <sec:intercept-url pattern='/**' access='ROLE_BASIC' />
            </sec:filter-invocation-definition-source>
        </property>
    </bean>
 
    <bean id="roleVoter" class="org.springframework.security.vote.RoleVoter"/>
 
    <bean id="securityContextHolderAwareRequestFilter" class="org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter">
        <property name="wrapperClass" value="org.springframework.security.wrapper.SecurityContextHolderAwareRequestWrapper"/>
    </bean>
 
</beans>
 
---------- UserDetailsService
 
public class BtdUserDetailsService implements UserDetailsService {
    private UserService userService;
 
    @Override
    public UserDetails loadUserByUsername(String userName) throws UsernameNotFoundException, DataAccessException {
 
        //find user - do the regular stuff.
        checkDefaultRoles();
 
        User user = userService.findByUserId(userName);
 
        user = checkUser(user, userName);
 
        return new BtdUserDetails(user);
    }
......
}
 
 
------------- Custom filter - this is incomplete and needs some pointers.
 
import javax.servlet.http.HttpServletRequest;
import org.springframework.security.ui.preauth.AbstractPreAuthenticatedProcessingFilter;
 
public class PreAuthenticatedProcessingFilter extends AbstractPreAuthenticatedProcessingFilter {
 
    @Override
    protected Object getPreAuthenticatedPrincipal(HttpServletRequest request) {
        //WHAT OBJECT DO I RETURN HERE?
        String userName = "testUser";
        return userName;
    }
 
    @Override
    protected Object getPreAuthenticatedCredentials(HttpServletRequest arg0) {
        return null;
    }
 
    public int getOrder() {
        return org.springframework.security.ui.FilterChainOrder.PRE_AUTH_FILTER;
    }
 
}
                                              

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public class BtdUserDetailsService implements AuthenticationUserDetailsService {
 
    public UserDetails loadUserDetails(Authentication authentication)
            throws UsernameNotFoundException {
        String username = (String) authentication.getPrincipal();
        
        User user = userService.findByUserId(userName);
        
        return user;
    }
}
                                              

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