spring security 登录校验流程
spring security 登录校验流程
1、前台使用公钥将密码加密
import JSEncrypt from 'jsencrypt/bin/jsencrypt'
// 密钥对生成 http://web.chacuo.net/netrsakeypair
const publicKey = 公钥
const privateKey = 私钥
// 加密
export function encrypt(txt) {
const encryptor = new JSEncrypt()
encryptor.setPublicKey(publicKey) // 设置公钥
return encryptor.encrypt(txt) // 对需要加密的数据进行加密
}
// 解密
export function decrypt(txt) {
const encryptor = new JSEncrypt()
encryptor.setPrivateKey(privateKey)
return encryptor.decrypt(txt)
}
2、后台将前台传入的密码解密，使用传入的用户名以及解密后的密码生成Authentication对象，
然后获取认证管理器AuthenticationManager，使用该管理器来进行认证。
@Autowired
private final AuthenticationManagerBuilder authenticationManagerBuilder;
@PostMapping(value = "/login")
public ResponseEntity<Object> login(@Validated @RequestBody AuthUser authUser, HttpServletRequest request){
// 密码解密
RSA rsa = new RSA(privateKey, null);
String password = new String(rsa.decrypt(authUser.getPassword(), KeyType.PrivateKey));
// 以用户名和密码生成一个 authenticationToken
UsernamePasswordAuthenticationToken authenticationToken =
new UsernamePasswordAuthenticationToken(authUser.getUsername(), password);
// 用上面生成的 token 从 manager 里面获取 authentication
AuthenticationManager authenticationManager = authenticationManagerBuilder.getObject();
Authentication authentication = authenticationManager.authenticate(authenticationToken);
// 把用户信息放入Security上下文中，便于后面获取
SecurityContextHolder.getContext().setAuthentication(authentication);
// 生成令牌
String token = tokenProvider.createToken(authentication);
final JwtUser jwtUser = (JwtUser) authentication.getPrincipal();
// 保存在线信息
onlineUserService.save(jwtUser, token, request);
// 返回 token 与 用户信息
Map<String,Object> authInfo = new HashMap<String,Object>(2){{
put("token", properties.getTokenStartWith() + token);
put("user", jwtUser);
}};
if(singleLogin){
//踢掉之前已经登录的token
onlineUserService.checkLoginOnUser(authUser.getUsername(),token);
}
return ResponseEntity.ok(authInfo);
}
3、Authentication authentication = authenticationManager.authenticate(authenticationToken); 此方法为进行认证的方法；AuthenticationManager为接口，使用的实现类为provicerManager;
public Authentication authenticate(Authentication authentication)
throws AuthenticationException {
Class<? extends Authentication> toTest = authentication.getClass();
AuthenticationException lastException = null;
Authentication result = null;
boolean debug = logger.isDebugEnabled();
for (AuthenticationProvider provider : getProviders()) {
if (!provider.supports(toTest)) {
continue;
}
if (debug) {
logger.debug("Authentication attempt using "
+ provider.getClass().getName());
}
try {
result = provider.authenticate(authentication);
if (result != null) {
copyDetails(authentication, result);
break;
}
}
catch (AccountStatusException e) {
prepareException(e, authentication);
// SEC-546: Avoid polling additional providers if auth failure is due to
// invalid account status
throw e;
}
catch (InternalAuthenticationServiceException e) {
prepareException(e, authentication);
throw e;
}
catch (AuthenticationException e) {
lastException = e;
}
}
if (result == null && parent != null) {
// Allow the parent to try.
try {
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;
}
}
if (result != null) {
if (eraseCredentialsAfterAuthentication
&& (result instanceof CredentialsContainer)) {
// Authentication is complete. Remove credentials and other secret data
// from authentication
((CredentialsContainer) result).eraseCredentials();
}
eventPublisher.publishAuthenticationSuccess(result);
return result;
}
// Parent was null, or didn't authenticate (or throw an exception).
if (lastException == null) {
lastException = new ProviderNotFoundException(messages.getMessage(
"ProviderManager.providerNotFound",
new Object[] { toTest.getName() },
"No AuthenticationProvider found for {0}"));
}
prepareException(lastException, authentication);
throw lastException;
}
该方法循环从 provider List中获取支持该认证的AuthenticationProvider 对用户信息进行验证，验证代码为 result = provider.authenticate(authentication);
4、AuthenticationProvider为抽象类，使用的实现类为AbstractUserDetailsAuthenticationProvider。
public Authentication authenticate(Authentication authentication)
throws AuthenticationException {
Assert.isInstanceOf(UsernamePasswordAuthenticationToken.class, authentication,
() -> messages.getMessage(
"AbstractUserDetailsAuthenticationProvider.onlySupports",
"Only UsernamePasswordAuthenticationToken is supported"));
// Determine username
String username = (authentication.getPrincipal() == null) ? "NONE_PROVIDED"
: authentication.getName();
boolean cacheWasUsed = true;
UserDetails user = this.userCache.getUserFromCache(username);
if (user == null) {
cacheWasUsed = false;
try {
user = retrieveUser(username,
(UsernamePasswordAuthenticationToken) authentication);
}
catch (UsernameNotFoundException notFound) {
logger.debug("User '" + username + "' not found");
if (hideUserNotFoundExceptions) {
throw new BadCredentialsException(messages.getMessage(
"AbstractUserDetailsAuthenticationProvider.badCredentials",
"Bad credentials"));
}
else {
throw notFound;
}
}
Assert.notNull(user,
"retrieveUser returned null - a violation of the interface contract");
}
try {
preAuthenticationChecks.check(user);
additionalAuthenticationChecks(user,
(UsernamePasswordAuthenticationToken) authentication);
}
catch (AuthenticationException exception) {
if (cacheWasUsed) {
// There was a problem, so try again after checking
// we're using latest data (i.e. not from the cache)
cacheWasUsed = false;
user = retrieveUser(username,
(UsernamePasswordAuthenticationToken) authentication);
preAuthenticationChecks.check(user);
additionalAuthenticationChecks(user,
(UsernamePasswordAuthenticationToken) authentication);
}
else {
throw exception;
}
}
postAuthenticationChecks.check(user);
if (!cacheWasUsed) {
this.userCache.putUserInCache(user);
}
Object principalToReturn = user;
if (forcePrincipalAsString) {
principalToReturn = user.getUsername();
}
return createSuccessAuthentication(principalToReturn, authentication, user);
}
其中
user = retrieveUser(username,
(UsernamePasswordAuthenticationToken) authentication);
所做的工作就是查询系统用户信息，一般存储于数据库；
5、AbstractUserDetailsAuthenticationProvider的retrieveUser方法是抽象的，默认实现为DaoAuthenticationProvider；
protected final UserDetails retrieveUser(String username,
UsernamePasswordAuthenticationToken authentication)
throws AuthenticationException {
prepareTimingAttackProtection();
try {
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);
}
}
其中获取用户信息代码为 UserDetails loadedUser = this.getUserDetailsService().loadUserByUsername(username);
getUserDetailsService()返回org.springframework.security.core.userdetails.UserDetailsService对象，需要自己实现这个接口。
@Service("userDetailsService")
public class UserDetailsServiceImpl implements UserDetailsService {
private final UserService userService;
public UserDetailsServiceImpl(UserService userService) {
this.userService = userService;
}
@Override
public UserDetails loadUserByUsername(String username) {
UserDetails user=userService.selectByName(userName);
return user;
}
}
loadUserByUsername返回org.springframework.security.core.userdetails.UserDetails对象。返回用户对象后，代码返回到第四步的
additionalAuthenticationChecks(user,
(UsernamePasswordAuthenticationToken) authentication);
改行代码对用户密码进行校验；
6、
private PasswordEncoder passwordEncoder;
@SuppressWarnings("deprecation")
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();
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"));
}
}
presentedPassword为前台用户解密后的密码，userDetails.getPassword()则为存储的加密后的密码；使用PasswordEncoder编码器对两个密码进行匹配；
PasswordEncoder需要自己进行配置
@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Bean
public PasswordEncoder passwordEncoder() {
// 密码加密方式
return new BCryptPasswordEncoder();
}
}
Bcrypt并不是加密/解密算法，而是一个Hash算法，加密/解密算法意味着数据可以被解密，而Hash则是不可逆的。无法从哈希值逆推得到原始数据，只能将数据Hash比较两个哈希值是否相等。
7、校验完成后返回 createSuccessAuthentication(principalToReturn, authentication, user);该方法创建Authentication对象
protected Authentication createSuccessAuthentication(Object principal,
Authentication authentication, UserDetails user) {
UsernamePasswordAuthenticationToken result = new UsernamePasswordAuthenticationToken(
principal, authentication.getCredentials(),
authoritiesMapper.mapAuthorities(user.getAuthorities()));
result.setDetails(authentication.getDetails());
return result;
}
这样就得到一个Authentication对象，将该对象放入springsecurity上下文中，之后就可直接从上下文获取到用户信息；
参考：
https://www.jianshu.com/p/32fa221e03b7
https://www.jianshu.com/p/922963106729
https://blog.csdn.net/qq_44969643/article/details/109502429