在前面两节Spring security （一）架构框架-Component、Service、Filter分析和Spring Security（二）--WebSecurityConfigurer配置以及filter顺序为Spring Security认证做好了准备，可让咱们更好的理解认证过程以及项目代码编写。git
认证工做流程：github
AbstractAuthenticationProcessingFilter
doFilter()(attemptAuthentication()获取Authentication实体)
->UsernamePasswordAuthenticationFilter（AbstractAuthenticationProcessingFilter的子类）
attemptAuthentication() （在UsernamePasswordAuthenticationToken()中将username 和 password 生成 UsernamePasswordAuthenticationToken对象,getAuthenticationManager().authenticate进行认证以及返回获取Authentication实体）
->AuthenticationManager
->ProviderManager()（AuthenticationManager接口实现）
authenticate()(AuthenticationProvider.authenticate()进行认证并获取Authentication实体)
->AbstractUserDetailsAuthenticationProvider(内置缓存机制，若是缓存中没有用户信息就调用retrieveUser()获取用户)
authenticate() (获取Authentication实体须要userDetails，在缓存中或者retrieveUser()获取userDetails；验证additionalAuthenticationChecks()； createSuccessAuthentication()生成Authentication实体)
->DaoAuthenticationProvider
retrieveUser() (调用自定义UserDetailsService中loadUserByUsername()加载userDetails)
->UserDetailsService
loadUserByUsername()（获取userDetails）
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具体流程请看下面小节。算法
当请求来临时，在默认状况下，请求先通过AbstractAuthenticationProcessingFilter的子类UsernamePasswordAuthenticationFilter过滤器。在UsernamePasswordAuthenticationFilter过滤器调用attemptAuthentication()方法现实主要的两步过程：spring
UsernamePasswordAuthenticationFilter源码分析：数据库
public class UsernamePasswordAuthenticationFilter extends
AbstractAuthenticationProcessingFilter {
....
public Authentication attemptAuthentication(HttpServletRequest request,
HttpServletResponse response) throws AuthenticationException {
.....
//1.建立拥有用户的详情信息的Authentication对象
UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(
username, password);
// Allow subclasses to set the "details" property
setDetails(request, authRequest);
//2.AuthenticationManager进行认证
return this.getAuthenticationManager().authenticate(authRequest);
}
...
}
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在UsernamePasswordAuthenticationFilter中看出，将调用AuthenticationManager接口的authenticate()方法进行详细认证。默认状况将使用AuthenticationManager子类ProviderManager的authenticate()进行认证，能够分红三个主要过程：缓存
ProviderManager源码分析：微信
public class ProviderManager implements AuthenticationManager, MessageSourceAware,
InitializingBean {
...
public Authentication authenticate(Authentication authentication)
throws AuthenticationException {
...
//AuthenticationProvider依次进行认证
for (AuthenticationProvider provider : getProviders()) {
...
try {
//1.1进行认证，并返回Authentication对象
result = provider.authenticate(authentication);
if (result != null) {
copyDetails(authentication, result);
break;
}
}
...
catch (AuthenticationException e) {
lastException = e;
}
}
if (result == null && parent != null) {
// Allow the parent to try.
try {
//1.2若是1.1认证中没有一个验证经过，则使用父类型AuthenticationManager进行验证
result = parent.authenticate(authentication);
}
catch (ProviderNotFoundException e) {
// ignore as we will throw below if no other exception occurred prior to
// calling parent and the parent
// may throw ProviderNotFound even though a provider in the child already
// handled the request
}
catch (AuthenticationException e) {
lastException = e;
}
}
//2.从authentication中删除凭据和其余机密数据
if (result != null) {
if (eraseCredentialsAfterAuthentication
&& (result instanceof CredentialsContainer)) {
// Authentication is complete. Remove credentials and other secret data
// from authentication
((CredentialsContainer) result).eraseCredentials();
}
//3.发布认证成功事件，并将Authentication对象保存到security context中
eventPublisher.publishAuthenticationSuccess(result);
return result;
}
}
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在默认认证详细处理过程当中，AuthenticationProvider认证由AbstractUserDetailsAuthenticationProvider抽象类以及AbstractUserDetailsAuthenticationProvider的子类DaoAuthenticationProvider进行方法重写协助共同工做进行认证的。主要能够分红如下步骤：架构
获取用户信息UserDetails，首先从缓存中读取信息，若是缓存中没有的化，在UserDetailsService中加载，其最主要能够从咱们自定义的UserDetailsService进行读取用户信息UserDetails；app
验证三步走：
1). preAuthenticationChecks框架
2). additionalAuthenticationChecks：使用PasswordEncoder.matches()方法进行认证，其验证方式中验证数据已通过PasswordEncoder算法加密，能够经过实现PasswordEncoder接口来定义算法加密方式。
3). postAuthenticationChecks
将已经过验证的用户信息封装成 UsernamePasswordAuthenticationToken对象并返回；该对象封装了用户的身份信息，以及相应的权限信息。
AbstractUserDetailsAuthenticationProvider主要功能提供authenticate()认证方法以及给DaoAuthenticationProvider重写方法源码分析：
public abstract class AbstractUserDetailsAuthenticationProvider implements
AuthenticationProvider, InitializingBean, MessageSourceAware {
...
public Authentication authenticate(Authentication authentication)
throws AuthenticationException {
...
boolean cacheWasUsed = true;
//1.1获取缓存中UserDetails信息
UserDetails user = this.userCache.getUserFromCache(username);
//1.2 若是缓存中没有信息，从UserDetailsService中获取
if (user == null) {
cacheWasUsed = false;
try {
//使用DaoAuthenticationProvider中重写的方法去获取信息
user = retrieveUser(username,
(UsernamePasswordAuthenticationToken) authentication);
}catch{
...
}
...
try {
//进行检验认证
preAuthenticationChecks.check(user);
additionalAuthenticationChecks(user,
(UsernamePasswordAuthenticationToken) authentication);
}catch{
...
}
...
postAuthenticationChecks.check(user);
....
// 将已经过验证的用户信息封装成 UsernamePasswordAuthenticationToken对象并返回
return createSuccessAuthentication(principalToReturn, authentication, user);
}
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DaoAuthenticationProvider功能主要为认证凭证加密PasswordEncoder，以及重写AbstractUserDetailsAuthenticationProvider抽象类的retrieveUser、additionalAuthenticationChecks方法，其中retrieveUser主要是获取UserDetails信息，源码分析
protected final UserDetails retrieveUser(String username,
UsernamePasswordAuthenticationToken authentication)
throws AuthenticationException {
prepareTimingAttackProtection();
try {
//根据UserDetailsService获取UserDetails信息，从自定义的UserDetailsService获取
UserDetails loadedUser = this.getUserDetailsService().loadUserByUsername(username);
if (loadedUser == null) {
throw new InternalAuthenticationServiceException(
"UserDetailsService returned null, which is an interface contract violation");
}
return loadedUser;
}
catch (UsernameNotFoundException ex) {
mitigateAgainstTimingAttack(authentication);
throw ex;
}
catch (InternalAuthenticationServiceException ex) {
throw ex;
}
catch (Exception ex) {
throw new InternalAuthenticationServiceException(ex.getMessage(), ex);
}
}
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additionalAuthenticationChecks主要使用PasswordEncoder进行密码验证，源码分析：
protected void additionalAuthenticationChecks(UserDetails userDetails,
UsernamePasswordAuthenticationToken authentication)
throws AuthenticationException {
if (authentication.getCredentials() == null) {
logger.debug("Authentication failed: no credentials provided");
throw new BadCredentialsException(messages.getMessage(
"AbstractUserDetailsAuthenticationProvider.badCredentials",
"Bad credentials"));
}
String presentedPassword = authentication.getCredentials().toString();
//进行密码验证
if (!passwordEncoder.matches(presentedPassword, userDetails.getPassword())) {
logger.debug("Authentication failed: password does not match stored value");
throw new BadCredentialsException(messages.getMessage(
"AbstractUserDetailsAuthenticationProvider.badCredentials",
"Bad credentials"));
}
}
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在认证中必须获取认证凭证，从UserDetailsService获取到认证凭证，UserDetailsService接口只有一个方法：
UserDetails loadUserByUsername(String username) throws UsernameNotFoundException;
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经过用户名 username 调用方法 loadUserByUsername 返回了一个UserDetails接口对象：
public interface UserDetails extends Serializable {
//1.权限集合
Collection<? extends GrantedAuthority> getAuthorities();
//2.密码
String getPassword();
//3.用户名
String getUsername();
//4.用户是否过时
boolean isAccountNonExpired();
//5.是否锁定
boolean isAccountNonLocked();
//6.用户密码是否过时
boolean isCredentialsNonExpired();
//7.帐号是否可用（可理解为是否删除）
boolean isEnabled();
}
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咱们经过实现UserDetailsService自定义获取UserDetails类，能够从不一样数据源中获取认证凭证。
总结Spring Security（二）--WebSecurityConfigurer配置以及filter顺序和本节Spring security（三）想要实现简单认证过程：
@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
// TODO Auto-generated method stub
//super.configure(http);
http .csrf().disable()
.authorizeRequests()
.anyRequest().authenticated()
.and()
.formLogin()
.loginPage("/login")
.loginProcessingUrl("/login/form")
.failureUrl("/login-error")
.permitAll() //表单登陆，permitAll()表示这个不须要验证 登陆页面，登陆失败页面
.and()
.logout().permitAll();
}
}
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@service
public class CustomUserService implements UserDetailsService {
@Autowired
private UserInfoMapper userInfoMapper;
@Autowired
private PermissionInfoMapper permissionInfoMapper;
@Autowired
private BCryptPasswordEncoderService bCryptPasswordEncoderService;
@Override
public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
// TODO Auto-generated method stub
//这里能够能够经过username（登陆时输入的用户名）而后到数据库中找到对应的用户信息，并构建成咱们本身的UserInfo来返回。
UserInfoDTO user = userInfoMapper.getUserInfoByUserName(username);
if (user != null) {
List<PermissionInfoDTO> permissionInfoDTOS = permissionInfoMapper.findByAdminUserId(userInfo.getId());
List<GrantedAuthority> grantedAuthorityList = new ArrayList<>();
for (PermissionInfoDTO permissionInfoDTO : permissionInfoDTOS) {
if (permissionInfoDTO != null && permissionInfoDTO.getPermissionName() != null) {
GrantedAuthority grantedAuthority = new SimpleGrantedAuthority(
permissionInfoDTO.getPermissionName());
grantedAuthorityList.add(grantedAuthority);
}
}
return new User(userInfo.getUserName(), bCryptPasswordEncoderService.encode(userInfo.getPasswaord()), grantedAuthorityList);
}else {
throw new UsernameNotFoundException("admin" + username + "do not exist");
}
}
}
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连接
后续会spring security认证的扩展知识Spring Security OAuth2等，以及项目demo：Spring Security OAuth2 整合 JWT、ip、短信以及微信方式登录的代码分析与分享。最后若有错误可评论告知。
欢迎转载，标明出处！！