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341 lines
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341 lines
14 KiB
Plaintext
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[[jc]]
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= Java Configuration
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General support for https://docs.spring.io/spring/docs/3.1.x/spring-framework-reference/html/beans.html#beans-java[Java Configuration] was added to Spring Framework in Spring 3.1.
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Since Spring Security 3.2 there has been Spring Security Java Configuration support which enables users to easily configure Spring Security without the use of any XML.
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If you are familiar with the xref:servlet/configuration/xml-namespace.adoc#ns-config[Security Namespace Configuration] then you should find quite a few similarities between it and the Security Java Configuration support.
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NOTE: Spring Security provides https://github.com/spring-projects/spring-security-samples/tree/main/servlet/java-configuration[lots of sample applications] which demonstrate the use of Spring Security Java Configuration.
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== Hello Web Security Java Configuration
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The first step is to create our Spring Security Java Configuration.
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The configuration creates a Servlet Filter known as the `springSecurityFilterChain` which is responsible for all the security (protecting the application URLs, validating submitted username and passwords, redirecting to the log in form, etc) within your application.
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You can find the most basic example of a Spring Security Java Configuration below:
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[[jc-hello-wsca]]
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[source,java]
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----
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.context.annotation.*;
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import org.springframework.security.config.annotation.authentication.builders.*;
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import org.springframework.security.config.annotation.web.configuration.*;
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@EnableWebSecurity
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public class WebSecurityConfig {
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@Bean
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public UserDetailsService userDetailsService() {
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InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
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manager.createUser(User.withDefaultPasswordEncoder().username("user").password("password").roles("USER").build());
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return manager;
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}
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}
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----
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There really isn't much to this configuration, but it does a lot.
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You can find a summary of the features below:
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* Require authentication to every URL in your application
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* Generate a login form for you
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* Allow the user with the *Username* _user_ and the *Password* _password_ to authenticate with form based authentication
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* Allow the user to logout
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* https://en.wikipedia.org/wiki/Cross-site_request_forgery[CSRF attack] prevention
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* https://en.wikipedia.org/wiki/Session_fixation[Session Fixation] protection
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* Security Header integration
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** https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security[HTTP Strict Transport Security] for secure requests
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** https://msdn.microsoft.com/en-us/library/ie/gg622941(v=vs.85).aspx[X-Content-Type-Options] integration
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** Cache Control (can be overridden later by your application to allow caching of your static resources)
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** https://msdn.microsoft.com/en-us/library/dd565647(v=vs.85).aspx[X-XSS-Protection] integration
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** X-Frame-Options integration to help prevent https://en.wikipedia.org/wiki/Clickjacking[Clickjacking]
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* Integrate with the following Servlet API methods
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** https://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#getRemoteUser()[HttpServletRequest#getRemoteUser()]
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** https://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#getUserPrincipal()[HttpServletRequest#getUserPrincipal()]
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** https://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#isUserInRole(java.lang.String)[HttpServletRequest#isUserInRole(java.lang.String)]
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** https://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#login(java.lang.String,%20java.lang.String)[HttpServletRequest#login(java.lang.String, java.lang.String)]
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** https://docs.oracle.com/javaee/6/api/javax/servlet/http/HttpServletRequest.html#logout()[HttpServletRequest#logout()]
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=== AbstractSecurityWebApplicationInitializer
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The next step is to register the `springSecurityFilterChain` with the war.
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This can be done in Java Configuration with https://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-container-config[Spring's WebApplicationInitializer support] in a Servlet 3.0+ environment.
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Not suprisingly, Spring Security provides a base class `AbstractSecurityWebApplicationInitializer` that will ensure the `springSecurityFilterChain` gets registered for you.
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The way in which we use `AbstractSecurityWebApplicationInitializer` differs depending on if we are already using Spring or if Spring Security is the only Spring component in our application.
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* <<abstractsecuritywebapplicationinitializer-without-existing-spring>> - Use these instructions if you are not using Spring already
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* <<abstractsecuritywebapplicationinitializer-with-spring-mvc>> - Use these instructions if you are already using Spring
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[[abstractsecuritywebapplicationinitializer-without-existing-spring]]
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=== AbstractSecurityWebApplicationInitializer without Existing Spring
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If you are not using Spring or Spring MVC, you will need to pass in the `WebSecurityConfig` into the superclass to ensure the configuration is picked up.
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You can find an example below:
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[source,java]
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----
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import org.springframework.security.web.context.*;
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public class SecurityWebApplicationInitializer
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extends AbstractSecurityWebApplicationInitializer {
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public SecurityWebApplicationInitializer() {
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super(WebSecurityConfig.class);
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}
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}
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----
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The `SecurityWebApplicationInitializer` will do the following things:
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* Automatically register the springSecurityFilterChain Filter for every URL in your application
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* Add a ContextLoaderListener that loads the <<jc-hello-wsca,WebSecurityConfig>>.
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[[abstractsecuritywebapplicationinitializer-with-spring-mvc]]
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=== AbstractSecurityWebApplicationInitializer with Spring MVC
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If we were using Spring elsewhere in our application we probably already had a `WebApplicationInitializer` that is loading our Spring Configuration.
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If we use the previous configuration we would get an error.
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Instead, we should register Spring Security with the existing `ApplicationContext`.
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For example, if we were using Spring MVC our `SecurityWebApplicationInitializer` would look something like the following:
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[source,java]
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----
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import org.springframework.security.web.context.*;
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public class SecurityWebApplicationInitializer
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extends AbstractSecurityWebApplicationInitializer {
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}
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----
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This would simply only register the springSecurityFilterChain Filter for every URL in your application.
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After that we would ensure that `WebSecurityConfig` was loaded in our existing ApplicationInitializer.
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For example, if we were using Spring MVC it would be added in the `getRootConfigClasses()`
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[[message-web-application-inititializer-java]]
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[source,java]
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----
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public class MvcWebApplicationInitializer extends
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AbstractAnnotationConfigDispatcherServletInitializer {
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@Override
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protected Class<?>[] getRootConfigClasses() {
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return new Class[] { WebSecurityConfig.class };
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}
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// ... other overrides ...
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}
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----
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[[jc-httpsecurity]]
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== HttpSecurity
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Thus far our <<jc-hello-wsca,WebSecurityConfig>> only contains information about how to authenticate our users.
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How does Spring Security know that we want to require all users to be authenticated?
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How does Spring Security know we want to support form based authentication?
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Actually, there is a bean that is being invoked behind the scenes called `SecurityFilterChain`.
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It is configured with the following default implementation:
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[source,java]
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----
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@Bean
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public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
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http
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.authorizeRequests(authorize -> authorize
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.anyRequest().authenticated()
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)
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.formLogin(withDefaults())
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.httpBasic(withDefaults());
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return http.build();
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}
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----
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The default configuration above:
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* Ensures that any request to our application requires the user to be authenticated
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* Allows users to authenticate with form based login
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* Allows users to authenticate with HTTP Basic authentication
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You will notice that this configuration is quite similar the XML Namespace configuration:
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[source,xml]
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----
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<http>
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<intercept-url pattern="/**" access="authenticated"/>
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<form-login />
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<http-basic />
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</http>
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----
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== Multiple HttpSecurity
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We can configure multiple `HttpSecurity` instances just as we can have multiple `<http>` blocks.
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The key is to register multiple `SecurityFilterChain` ``@Bean``s.
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For example, the following is an example of having a different configuration for URL's that start with `/api/`.
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[source,java]
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----
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@EnableWebSecurity
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public class MultiHttpSecurityConfig {
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@Bean <1>
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public UserDetailsService userDetailsService() throws Exception {
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// ensure the passwords are encoded properly
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UserBuilder users = User.withDefaultPasswordEncoder();
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InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
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manager.createUser(users.username("user").password("password").roles("USER").build());
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manager.createUser(users.username("admin").password("password").roles("USER","ADMIN").build());
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return manager;
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}
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@Bean
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@Order(1) <2>
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public SecurityFilterChain apiFilterChain(HttpSecurity http) throws Exception {
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http
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.antMatcher("/api/**") <3>
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.authorizeHttpRequests(authorize -> authorize
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.anyRequest().hasRole("ADMIN")
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)
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.httpBasic(withDefaults());
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return http.build();
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}
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@Bean <4>
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public SecurityFilterChain formLoginFilterChain(HttpSecurity http) throws Exception {
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http
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.authorizeHttpRequests(authorize -> authorize
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.anyRequest().authenticated()
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)
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.formLogin(withDefaults());
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return http.build();
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}
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}
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----
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<1> Configure Authentication as normal
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<2> Register an instance of `SecurityFilterChain` that contains `@Order` to specify which `SecurityFilterChain` should be considered first.
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<3> The `http.antMatcher` states that this `HttpSecurity` will only be applicable to URLs that start with `/api/`
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<4> Register another instance of `SecurityFilterChain`.
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If the URL does not start with `/api/` this configuration will be used.
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This configuration is considered after `apiFilterChain` since it has an `@Order` value after `1` (no `@Order` defaults to last).
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[[jc-custom-dsls]]
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== Custom DSLs
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You can provide your own custom DSLs in Spring Security.
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For example, you might have something that looks like this:
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[source,java]
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----
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public class MyCustomDsl extends AbstractHttpConfigurer<MyCustomDsl, HttpSecurity> {
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private boolean flag;
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@Override
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public void init(HttpSecurity http) throws Exception {
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// any method that adds another configurer
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// must be done in the init method
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http.csrf().disable();
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}
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@Override
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public void configure(HttpSecurity http) throws Exception {
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ApplicationContext context = http.getSharedObject(ApplicationContext.class);
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// here we lookup from the ApplicationContext. You can also just create a new instance.
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MyFilter myFilter = context.getBean(MyFilter.class);
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myFilter.setFlag(flag);
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http.addFilterBefore(myFilter, UsernamePasswordAuthenticationFilter.class);
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}
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public MyCustomDsl flag(boolean value) {
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this.flag = value;
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return this;
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}
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public static MyCustomDsl customDsl() {
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return new MyCustomDsl();
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}
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}
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----
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NOTE: This is actually how methods like `HttpSecurity.authorizeRequests()` are implemented.
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The custom DSL can then be used like this:
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[source,java]
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----
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@EnableWebSecurity
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public class Config {
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@Bean
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public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
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http
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.apply(customDsl())
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.flag(true)
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.and()
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...;
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return http.build();
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}
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}
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----
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The code is invoked in the following order:
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* Code in `Config`s configure method is invoked
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* Code in `MyCustomDsl`s init method is invoked
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* Code in `MyCustomDsl`s configure method is invoked
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If you want, you can add `MyCustomDsl` to `HttpSecurity` by default by using `SpringFactories`.
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For example, you would create a resource on the classpath named `META-INF/spring.factories` with the following contents:
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.META-INF/spring.factories
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----
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org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer = sample.MyCustomDsl
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----
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Users wishing to disable the default can do so explicitly.
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[source,java]
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----
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@EnableWebSecurity
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public class Config {
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@Bean
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public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
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http
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.apply(customDsl()).disable()
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...;
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return http.build();
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}
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}
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----
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[[post-processing-configured-objects]]
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== Post Processing Configured Objects
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Spring Security's Java Configuration does not expose every property of every object that it configures.
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This simplifies the configuration for a majority of users.
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Afterall, if every property was exposed, users could use standard bean configuration.
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While there are good reasons to not directly expose every property, users may still need more advanced configuration options.
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To address this Spring Security introduces the concept of an `ObjectPostProcessor` which can be used to modify or replace many of the Object instances created by the Java Configuration.
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For example, if you wanted to configure the `filterSecurityPublishAuthorizationSuccess` property on `FilterSecurityInterceptor` you could use the following:
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[source,java]
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----
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@Bean
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public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
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http
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.authorizeRequests(authorize -> authorize
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.anyRequest().authenticated()
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.withObjectPostProcessor(new ObjectPostProcessor<FilterSecurityInterceptor>() {
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public <O extends FilterSecurityInterceptor> O postProcess(
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O fsi) {
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fsi.setPublishAuthorizationSuccess(true);
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return fsi;
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}
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})
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);
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return http.build();
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}
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----
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