spring security using kerberos/spnego authentication - spring-mvc

Question

I have got spring security using kerberos authentication successfully working. But it seems the spring framework is invoking KerberosServiceAuthenticationProvider.userDetailsService to get the roles, I would have thought that it gets the roles only once until the session is invalidated. My config looks like
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:beans="http://www.springframework.org/schema/beans"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.0.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security-3.0.xsd">
<http entry-point-ref="spnegoEntryPoint" auto-config="false">
<intercept-url pattern="/login*" access="IS_AUTHENTICATED_ANONYMOUSLY" />
<intercept-url pattern="/j_spring_security_check*" access="IS_AUTHENTICATED_ANONYMOUSLY"/>
<intercept-url pattern="/**" access="IS_AUTHENTICATED_FULLY" />
<custom-filter ref="spnegoAuthenticationProcessingFilter" position="BASIC_AUTH_FILTER" />
<form-login login-page="/login.html" default-target-url="/" always-use-default-target="true"/>
</http>
<authentication-manager alias="authenticationManager">
<authentication-provider ref="kerberosServiceAuthenticationProvider" />
<authentication-provider ref="kerberosAuthenticationProvider"/>
</authentication-manager>
<beans:bean id="spnegoEntryPoint"
class="org.springframework.security.extensions.kerberos.web.SpnegoEntryPoint" />
<beans:bean id="spnegoAuthenticationProcessingFilter"
class="org.springframework.security.extensions.kerberos.web.SpnegoAuthenticationProcessingFilter">
<beans:property name="failureHandler">
<beans:bean class="org.springframework.security.web.authentication.ExceptionMappingAuthenticationFailureHandler">
<beans:property name="defaultFailureUrl" value="/login.html" />
<beans:property name="allowSessionCreation" value="true"/>
</beans:bean>
</beans:property>
<beans:property name="authenticationManager" ref="authenticationManager" />
</beans:bean>
<beans:bean id="kerberosServiceAuthenticationProvider"
class="org.springframework.security.extensions.kerberos.KerberosServiceAuthenticationProvider">
<beans:property name="ticketValidator">
<beans:bean
class="org.springframework.security.extensions.kerberos.SunJaasKerberosTicketValidator">
<beans:property name="servicePrincipal" value="HTTP/mywebserver.corpza.corp.co.za"/>
<beans:property name="keyTabLocation" value="classpath:mywebserver.keytab" />
<beans:property name="debug" value="true"/>
</beans:bean>
</beans:property>
<beans:property name="userDetailsService" ref="dummyUserDetailsService" />
</beans:bean>
<beans:bean id="kerberosAuthenticationProvider" class="org.springframework.security.extensions.kerberos.KerberosAuthenticationProvider">
<beans:property name="kerberosClient">
<beans:bean class="org.springframework.security.extensions.kerberos.SunJaasKerberosClient">
<beans:property name="debug" value="true" />
</beans:bean>
</beans:property>
<beans:property name="userDetailsService" ref="dummyUserDetailsService" />
</beans:bean>
<beans:bean class="org.springframework.security.extensions.kerberos.GlobalSunJaasKerberosConfig">
<beans:property name="debug" value="true" />
<beans:property name="krbConfLocation" value="/etc/krb5.conf" />
</beans:bean>
<beans:bean id="dummyUserDetailsService" class="main.server.DummyUserDetailsService"/>
</beans:beans>
so my DummyUserDetailsService.loadUserByUsername(Styring username) is invoked each time a secure page is requested, I am loading the user roles from database and don't want to run the query each time a request is made, is there any configuration I need to do to prevent this?

Answer 1

thanks Michael, I got it working by extending SpnegoAuthenticationProcessingFilter class and overriding doFilter
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
if (skipIfAlreadyAuthenticated) {
Authentication existingAuth = SecurityContextHolder.getContext().getAuthentication();
if (existingAuth != null && existingAuth.isAuthenticated()
&& (existingAuth instanceof AnonymousAuthenticationToken) == false) {
chain.doFilter(request, response);
return;
}
}
super.doFilter(req, res, chain);
}

Answer 2

Tell Spring Security to cache the authentication in the HTTP Session. Here is how.