Spring Security Authentication Provider – Spring安全认证供应商

最后修改: 2013年 6月 2日


1. Overview


In this tutorial, we’ll learn how to set up an Authentication Provider in Spring Security, allowing for additional flexibility compared to the standard scenario using a simple UserDetailsService.

在本教程中,我们将学习如何在Spring Security中设置Authentication Provider,与使用简单的UserDetailsService的标准场景相比,允许更多的灵活性。

2. The Authentication Provider


Spring Security provides a variety of options for performing authentication. These options follow a simple contract; an Authentication request is processed by an AuthenticationProvider, and a fully authenticated object with full credentials is returned.

Spring Security为执行认证提供了多种选择。这些选项遵循一个简单的契约;一个Authentication请求由AuthenticationProvider处理,并返回一个带有完整凭证的完全认证对象。

The standard and most common implementation is the DaoAuthenticationProvider, which retrieves the user details from a simple, read-only user DAO, the UserDetailsService. This User Details Service only has access to the username in order to retrieve the full user entity, which is enough for most scenarios.


More custom scenarios will still need to access the full Authentication request to be able to perform the authentication process. For example, when authenticating against some external, third party service (such as Crowd), both the username and password from the authentication request will be necessary.


For these more advanced scenarios, we’ll need to define a custom Authentication Provider:


public class CustomAuthenticationProvider implements AuthenticationProvider {

    public Authentication authenticate(Authentication authentication) 
      throws AuthenticationException {
        String name = authentication.getName();
        String password = authentication.getCredentials().toString();
        if (shouldAuthenticateAgainstThirdPartySystem()) {
            // use the credentials
            // and authenticate against the third-party system
            return new UsernamePasswordAuthenticationToken(
              name, password, new ArrayList<>());
        } else {
            return null;

    public boolean supports(Class<?> authentication) {
        return authentication.equals(UsernamePasswordAuthenticationToken.class);

Notice that the granted authorities set on the returned Authentication object are empty. This is because authorities are, of course, application specific.


3. Register the Auth Provider


Now that we’ve defined the Authentication Provider, we need to specify it in the XML Security Configuration using the available namespace support:


<http use-expressions="true">
    <intercept-url pattern="/**" access="isAuthenticated()"/>

      ref="customAuthenticationProvider" />

4. Java Configuration


Next, we’ll take a look at the corresponding Java configuration:


public class SecurityConfig {

    private CustomAuthenticationProvider authProvider;

    public AuthenticationManager authManager(HttpSecurity http) throws Exception {
        AuthenticationManagerBuilder authenticationManagerBuilder = 
        return authenticationManagerBuilder.build();

    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        return http.build();


5. Performing Authentication


Requesting Authentication from the Client is basically the same with or without this custom authentication provider on the back end.


We’ll use a simple curl command to send an authenticated request:


curl --header "Accept:application/json" -i --user user1:user1Pass 

For the purposes of this example, we secured the REST API with Basic Authentication.

在这个例子中,我们用基本认证来保护REST API。

And we get back the expected 200 OK from the server:

而我们从服务器上得到了预期的200 OK。

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=B8F0EFA81B78DE968088EBB9AFD85A60; Path=/spring-security-custom/; HttpOnly
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Date: Sun, 02 Jun 2013 17:50:40 GMT

6. Conclusion


In this article, we explored an example of a custom authentication provider for Spring Security.

在这篇文章中,我们探讨了一个为Spring Security定制认证提供商的例子。

The full implementation of this article can be found in the GitHub project.