Spring Security : Global and Local AuthenticationManager example

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Global AuthenticationManager

To create an AuthenticationManager that is available to the entire application you can simply register the AuthenticationManager as a @Bean.

@Configuration
public class SecurityConfiguration {
    @Bean
    public EmbeddedLdapServerContextSourceFactoryBean contextSourceFactoryBean() {
        EmbeddedLdapServerContextSourceFactoryBean contextSourceFactoryBean =
            EmbeddedLdapServerContextSourceFactoryBean.fromEmbeddedLdapServer();
        contextSourceFactoryBean.setPort(0);
        return contextSourceFactoryBean;
    }

    @Bean
    AuthenticationManager ldapAuthenticationManager(
            BaseLdapPathContextSource contextSource) {
        LdapBindAuthenticationManagerFactory factory = 
            new LdapBindAuthenticationManagerFactory(contextSource);
        factory.setUserDnPatterns("uid={0},ou=people");
        factory.setUserDetailsContextMapper(new PersonContextMapper());
        return factory.createAuthenticationManager();
    }
}

Local AuthenticationManager

In Spring Security 5.6 we introduced the method HttpSecurity#authenticationManager that overrides the default AuthenticationManager for a specific SecurityFilterChain.
Below is an example configuration that sets a custom AuthenticationManager as the default:

@Configuration
public class SecurityConfiguration {

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests((authz) -> authz
                .anyRequest().authenticated()
            )
            .httpBasic(withDefaults())
            .authenticationManager(new CustomAuthenticationManager());
    }

}

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