Spring 和 Spring Security Kerberos

本参考文档部分解释了 Spring Security Kerberos 为任何基于 Spring 的应用程序提供的核心功能。

身份验证提供者 描述了身份验证提供者支持。

Spnego 协商 描述了 Spnego 协商支持。

使用 KerberosRestTemplate 描述了 RestTemplate 支持。

身份验证提供者

使用 JavaConfig 进行提供者配置。

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {

	@Value("${app.service-principal}")
	private String servicePrincipal;

	@Value("${app.keytab-location}")
	private String keytabLocation;

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		KerberosAuthenticationProvider kerberosAuthenticationProvider = kerberosAuthenticationProvider();
		KerberosServiceAuthenticationProvider kerberosServiceAuthenticationProvider = kerberosServiceAuthenticationProvider();
		ProviderManager providerManager = new ProviderManager(kerberosAuthenticationProvider,
				kerberosServiceAuthenticationProvider);

		http
			.authorizeHttpRequests((authz) -> authz
				.requestMatchers("/", "/home").permitAll()
				.anyRequest().authenticated()
			)
			.exceptionHandling()
				.authenticationEntryPoint(spnegoEntryPoint())
				.and()
			.formLogin()
				.loginPage("/login").permitAll()
				.and()
			.logout()
				.permitAll()
				.and()
			.authenticationProvider(kerberosAuthenticationProvider())
			.authenticationProvider(kerberosServiceAuthenticationProvider())
			.addFilterBefore(spnegoAuthenticationProcessingFilter(providerManager),
					BasicAuthenticationFilter.class);
			return http.build();
	}

	@Bean
	public KerberosAuthenticationProvider kerberosAuthenticationProvider() {
		KerberosAuthenticationProvider provider = new KerberosAuthenticationProvider();
		SunJaasKerberosClient client = new SunJaasKerberosClient();
		client.setDebug(true);
		provider.setKerberosClient(client);
		provider.setUserDetailsService(dummyUserDetailsService());
		return provider;
	}

	@Bean
	public SpnegoEntryPoint spnegoEntryPoint() {
		return new SpnegoEntryPoint("/login");
	}

	public SpnegoAuthenticationProcessingFilter spnegoAuthenticationProcessingFilter(
			AuthenticationManager authenticationManager) {
		SpnegoAuthenticationProcessingFilter filter = new SpnegoAuthenticationProcessingFilter();
		filter.setAuthenticationManager(authenticationManager);
		return filter;
	}

	@Bean
	public KerberosServiceAuthenticationProvider kerberosServiceAuthenticationProvider() {
		KerberosServiceAuthenticationProvider provider = new KerberosServiceAuthenticationProvider();
		provider.setTicketValidator(sunJaasKerberosTicketValidator());
		provider.setUserDetailsService(dummyUserDetailsService());
		return provider;
	}

	@Bean
	public SunJaasKerberosTicketValidator sunJaasKerberosTicketValidator() {
		SunJaasKerberosTicketValidator ticketValidator = new SunJaasKerberosTicketValidator();
		ticketValidator.setServicePrincipal(servicePrincipal);
		ticketValidator.setKeyTabLocation(new FileSystemResource(keytabLocation));
		ticketValidator.setDebug(true);
		return ticketValidator;
	}

	@Bean
	public DummyUserDetailsService dummyUserDetailsService() {
		return new DummyUserDetailsService();
	}
}

Spnego 协商

使用 JavaConfig 进行 Spnego 配置。

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {

	@Value("${app.ad-domain}")
	private String adDomain;

	@Value("${app.ad-server}")
	private String adServer;

	@Value("${app.service-principal}")
	private String servicePrincipal;

	@Value("${app.keytab-location}")
	private String keytabLocation;

	@Value("${app.ldap-search-base}")
	private String ldapSearchBase;

	@Value("${app.ldap-search-filter}")
	private String ldapSearchFilter;

	@Bean
	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
		KerberosServiceAuthenticationProvider kerberosServiceAuthenticationProvider = kerberosServiceAuthenticationProvider();
		ActiveDirectoryLdapAuthenticationProvider activeDirectoryLdapAuthenticationProvider = activeDirectoryLdapAuthenticationProvider();
		ProviderManager providerManager = new ProviderManager(kerberosServiceAuthenticationProvider,
				activeDirectoryLdapAuthenticationProvider);

		http
			.authorizeHttpRequests((authz) -> authz
				.requestMatchers("/", "/home").permitAll()
				.anyRequest().authenticated()
			)
			.exceptionHandling()
				.authenticationEntryPoint(spnegoEntryPoint())
				.and()
			.formLogin()
				.loginPage("/login").permitAll()
				.and()
			.logout()
				.permitAll()
				.and()
			.authenticationProvider(activeDirectoryLdapAuthenticationProvider())
			.authenticationProvider(kerberosServiceAuthenticationProvider())
			.addFilterBefore(spnegoAuthenticationProcessingFilter(providerManager),
				BasicAuthenticationFilter.class);

		return http.build();
	}

	@Bean
	public ActiveDirectoryLdapAuthenticationProvider activeDirectoryLdapAuthenticationProvider() {
		return new ActiveDirectoryLdapAuthenticationProvider(adDomain, adServer);
	}

	@Bean
	public SpnegoEntryPoint spnegoEntryPoint() {
		return new SpnegoEntryPoint("/login");
	}

	public SpnegoAuthenticationProcessingFilter spnegoAuthenticationProcessingFilter(
			AuthenticationManager authenticationManager) {
		SpnegoAuthenticationProcessingFilter filter = new SpnegoAuthenticationProcessingFilter();
		filter.setAuthenticationManager(authenticationManager);
		return filter;
	}

	public KerberosServiceAuthenticationProvider kerberosServiceAuthenticationProvider() throws Exception {
		KerberosServiceAuthenticationProvider provider = new KerberosServiceAuthenticationProvider();
		provider.setTicketValidator(sunJaasKerberosTicketValidator());
		provider.setUserDetailsService(ldapUserDetailsService());
		return provider;
	}

	@Bean
	public SunJaasKerberosTicketValidator sunJaasKerberosTicketValidator() {
		SunJaasKerberosTicketValidator ticketValidator = new SunJaasKerberosTicketValidator();
		ticketValidator.setServicePrincipal(servicePrincipal);
		ticketValidator.setKeyTabLocation(new FileSystemResource(keytabLocation));
		ticketValidator.setDebug(true);
		return ticketValidator;
	}

	@Bean
	public KerberosLdapContextSource kerberosLdapContextSource() throws Exception {
		KerberosLdapContextSource contextSource = new KerberosLdapContextSource(adServer);
		contextSource.setLoginConfig(loginConfig());
		return contextSource;
	}

	public SunJaasKrb5LoginConfig loginConfig() throws Exception {
		SunJaasKrb5LoginConfig loginConfig = new SunJaasKrb5LoginConfig();
		loginConfig.setKeyTabLocation(new FileSystemResource(keytabLocation));
		loginConfig.setServicePrincipal(servicePrincipal);
		loginConfig.setDebug(true);
		loginConfig.setIsInitiator(true);
		loginConfig.afterPropertiesSet();
		return loginConfig;
	}

	@Bean
	public LdapUserDetailsService ldapUserDetailsService() throws Exception {
		FilterBasedLdapUserSearch userSearch =
				new FilterBasedLdapUserSearch(ldapSearchBase, ldapSearchFilter, kerberosLdapContextSource());
		LdapUserDetailsService service =
				new LdapUserDetailsService(userSearch, new ActiveDirectoryLdapAuthoritiesPopulator());
		service.setUserDetailsMapper(new LdapUserDetailsMapper());
		return service;
	}
}

使用 KerberosRestTemplate

如果需要以编程方式访问 Kerberos 保护的 Web 资源，我们有 `KerberosRestTemplate`，它扩展了 `RestTemplate` 并在委托给实际的 RestTemplate 方法之前执行必要的登录操作。您基本上有几个选项来配置此模板。

  • 如果要使用缓存的票据，请将 `keyTabLocation` 和 `userPrincipal` 留空。

  • 如果要使用 keytab 文件，请使用 `keyTabLocation` 和 `userPrincipal`。

  • 如果要自定义 `Krb5LoginModule` 选项，请使用 `loginOptions`。

  • 使用自定义的 httpClient。

使用票据缓存。

public void doWithTicketCache() {
    KerberosRestTemplate restTemplate =
            new KerberosRestTemplate();
    restTemplate.getForObject("http://neo.example.org:8080/hello", String.class);
}

使用 keytab 文件。

public void doWithKeytabFile() {
    KerberosRestTemplate restTemplate =
            new KerberosRestTemplate("/tmp/user2.keytab", "[email protected]");
    restTemplate.getForObject("http://neo.example.org:8080/hello", String.class);
}

使用 LDAP 服务进行身份验证

在大多数示例中，我们使用 `DummyUserDetailsService`，因为 Kerberos 身份验证成功后不一定需要查询真实的用户详细信息，并且我们可以使用 Kerberos 主体信息来创建该虚拟用户。但是，有一种方法可以以安全的方式访问 Kerberized LDAP 服务并从中查询用户详细信息。

`KerberosLdapContextSource` 可用于通过 Kerberos 绑定到 LDAP，这至少被证明与 Windows AD 服务配合良好。

@Value("${app.ad-server}")
private String adServer;

@Value("${app.service-principal}")
private String servicePrincipal;

@Value("${app.keytab-location}")
private String keytabLocation;

@Value("${app.ldap-search-base}")
private String ldapSearchBase;

@Value("${app.ldap-search-filter}")
private String ldapSearchFilter;

@Bean
public KerberosLdapContextSource kerberosLdapContextSource() {
	KerberosLdapContextSource contextSource = new KerberosLdapContextSource(adServer);
	SunJaasKrb5LoginConfig loginConfig = new SunJaasKrb5LoginConfig();
	loginConfig.setKeyTabLocation(new FileSystemResource(keytabLocation));
	loginConfig.setServicePrincipal(servicePrincipal);
	loginConfig.setDebug(true);
	loginConfig.setIsInitiator(true);
	contextSource.setLoginConfig(loginConfig);
	return contextSource;
}

@Bean
public LdapUserDetailsService ldapUserDetailsService() {
	FilterBasedLdapUserSearch userSearch =
			new FilterBasedLdapUserSearch(ldapSearchBase, ldapSearchFilter, kerberosLdapContextSource());
	LdapUserDetailsService service = new LdapUserDetailsService(userSearch);
	service.setUserDetailsMapper(new LdapUserDetailsMapper());
	return service;
}

示例 安全服务器 Windows 身份验证示例 目前已配置为在通过 Kerberos 发生身份验证时从 AD 查询用户详细信息。
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