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Before, Spring Security's @Enable* annotations were meta-annotated with @Configuration. While convenient, this is not consistent with the rest of the Spring projects and most notably Spring Framework's @Enable annotations. Additionally, the introduction of support for @Configuration(proxyBeanMethods=false) in Spring Framework provides a compelling reason to remove @Configuration meta-annotation from Spring Security's @Enable annotations and allow users to opt into their preferred configuration mode. Closes gh-6613 Signed-off-by: Joshua Sattler <joshua.sattler@mailbox.org>
110 lines
3.6 KiB
Plaintext
110 lines
3.6 KiB
Plaintext
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[[kotlin-config]]
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= Kotlin Configuration
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Spring Security Kotlin configuration has been available since Spring Security 5.3.
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It lets users configure Spring Security by using a native Kotlin DSL.
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[NOTE]
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====
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Spring Security provides https://github.com/spring-projects/spring-security-samples/tree/main/servlet/spring-boot/kotlin/hello-security[a sample application] to demonstrate the use of Spring Security Kotlin Configuration.
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====
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[[kotlin-config-httpsecurity]]
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== HttpSecurity
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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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There is a configuration class (called `SecurityFilterChain`) that is being invoked behind the scenes.
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It is configured with the following default implementation:
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====
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[source,kotlin]
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----
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@Bean
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open fun filterChain(http: HttpSecurity): SecurityFilterChain {
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http {
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authorizeRequests {
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authorize(anyRequest, authenticated)
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}
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formLogin { }
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httpBasic { }
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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 default configuration (shown in the preceding listing):
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* Ensures that any request to our application requires the user to be authenticated
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* Lets users authenticate with form-based login
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* Lets users authenticate with HTTP Basic authentication
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Note that this configuration is parallels the XML namespace configuration:
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====
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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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====
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== Multiple HttpSecurity Instances
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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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The following example has a different configuration for URL's that start with `/api/`:
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====
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[source,kotlin]
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----
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@Configuration
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@EnableWebSecurity
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class MultiHttpSecurityConfig {
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@Bean <1>
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public fun userDetailsService(): UserDetailsService {
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val users: User.UserBuilder = User.withDefaultPasswordEncoder()
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val manager = 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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@Order(1) <2>
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@Bean
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open fun apiFilterChain(http: HttpSecurity): SecurityFilterChain {
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http {
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securityMatcher("/api/**") <3>
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authorizeRequests {
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authorize(anyRequest, hasRole("ADMIN"))
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}
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httpBasic { }
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}
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return http.build()
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}
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@Bean <4>
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open fun formLoginFilterChain(http: HttpSecurity): SecurityFilterChain {
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http {
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authorizeRequests {
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authorize(anyRequest, authenticated)
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}
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formLogin { }
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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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<1> Configure Authentication as usual.
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<2> Create 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` is applicable only to URLs that start with `/api/`
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<4> Create another instance of `SecurityFilterChain`.
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If the URL does not start with `/api/`, this configuration is 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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====
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