AbstractAuthenticationProcessingFilter
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
// 匹配自己定义的拦截规则url 如果通过则放行
if (!requiresAuthentication(request, response)) {
chain.doFilter(request, response);
return;
}
if (logger.isDebugEnabled()) {
logger.debug("Request is to process authentication");
}
Authentication authResult;
try {
//关键点这里
authResult = attemptAuthentication(request, response);
if (authResult == null) {
// return immediately as subclass has indicated that it hasn't completed
// authentication
return;
}
sessionStrategy.onAuthentication(authResult, request, response);
}
catch (InternalAuthenticationServiceException failed) {
logger.error(
"An internal error occurred while trying to authenticate the user.",
failed);
unsuccessfulAuthentication(request, response, failed);
return;
}
catch (AuthenticationException failed) {
// Authentication failed
unsuccessfulAuthentication(request, response, failed);
return;
}
// Authentication success
if (continueChainBeforeSuccessfulAuthentication) {
chain.doFilter(request, response);
}
successfulAuthentication(request, response, chain, authResult);
}
attemptAuthentication(request, response); 这个方法会调用
UsernamePasswordAuthenticationFilter 或者他的子类（自己实现） 的attemptAuthentication
public class JwtAuthenticationFilter extends UsernamePasswordAuthenticationFilter {
...省略
@Override
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
// 从请求的 POST 中拿取 username 和 password 两个字段进行登入
String username = null;
String password = null;
//这段是取post username
if ("GET".equals(request.getMethod().toUpperCase())) {
username = request.getParameter("username");
password = request.getParameter("password");
} else if ("POST".equals(request.getMethod().toUpperCase()) && request.getContentType().toUpperCase().equals("APPLICATION/JSON")) {
ObjectMapper objectMapper = new ObjectMapper();
try {
PostLogin postLogin = objectMapper.readValue(request.getInputStream(), PostLogin.class);
username = postLogin.getUsername();
password = postLogin.getPassword();
} catch (IOException e) {
e.printStackTrace();
}
}
//封装一下 请求的用户账号密码
UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(username, password);
//这里设置请求的ip地址
setDetails(request, token);
// 交给 AuthenticationManager 进行鉴权
return getAuthenticationManager().authenticate(token);
getAuthenticationManager().authenticate(token);
调用ProviderManager authenticate 进行验证
public class ProviderManager implements AuthenticationManager, MessageSourceAware,
InitializingBean {
...省略
/**
* Attempts to authenticate the passed {@link Authentication} object.
* <p>
* The list of {@link AuthenticationProvider}s will be successively tried until an
* <code>AuthenticationProvider</code> indicates it is capable of authenticating the
* type of <code>Authentication</code> object passed. Authentication will then be
* attempted with that <code>AuthenticationProvider</code>.
* <p>
* If more than one <code>AuthenticationProvider</code> supports the passed
* <code>Authentication</code> object, the first one able to successfully
* authenticate the <code>Authentication</code> object determines the
* <code>result</code>, overriding any possible <code>AuthenticationException</code>
* thrown by earlier supporting <code>AuthenticationProvider</code>s.
* On successful authentication, no subsequent <code>AuthenticationProvider</code>s
* will be tried.
* If authentication was not successful by any supporting
* <code>AuthenticationProvider</code> the last thrown
* <code>AuthenticationException</code> will be rethrown.
*
* @param authentication the authentication request object.
*
* @return a fully authenticated object including credentials.
*
* @throws AuthenticationException if authentication fails.
*/
public Authentication authenticate(Authentication authentication)
throws AuthenticationException {
Class<? extends Authentication> toTest = authentication.getClass();
AuthenticationException lastException = null;
AuthenticationException parentException = null;
Authentication result = null;
Authentication parentResult = 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 = parentResult = 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 = parentException = e;
}
}
if (result != null) {
if (eraseCredentialsAfterAuthentication
&& (result instanceof CredentialsContainer)) {
// Authentication is complete. Remove credentials and other secret data
// from authentication
((CredentialsContainer) result).eraseCredentials();
}
// If the parent AuthenticationManager was attempted and successful than it will publish an AuthenticationSuccessEvent
// This check prevents a duplicate AuthenticationSuccessEvent if the parent AuthenticationManager already published it
if (parentResult == null) {
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}"));
}
// If the parent AuthenticationManager was attempted and failed than it will publish an AbstractAuthenticationFailureEvent
// This check prevents a duplicate AbstractAuthenticationFailureEvent if the parent AuthenticationManager already published it
if (parentException == null) {
prepareException(lastException, authentication);
}
throw lastException;
}
}
调用AbstractUserDetailsAuthenticationProvider 的 authenticate(Authentication authentication) 进行参数校验 和结果分发
public abstract class AbstractUserDetailsAuthenticationProvider implements
AuthenticationProvider, InitializingBean, MessageSourceAware
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);
}
}
调用 DaoAuthenticationProvider.additionalAuthenticationChecks(UserDetails userDetails,
UsernamePasswordAuthenticationToken authentication)进行最终比对
/**
* An {@link AuthenticationProvider} implementation that retrieves user details from a
* {@link UserDetailsService}.
*
* @author Ben Alex
* @author Rob Winch
*/
public class DaoAuthenticationProvider extends AbstractUserDetailsAuthenticationProvider {
...省略
@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"));
}
}
}
如果出现问题 在AbstractAuthenticationProcessingFilter .public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)方法中catch 异常里 调用 unsuccessfulAuthentication(request, response, failed);
成功则调用 successHandler.onAuthenticationSuccess(request, response, authResult);
try {
authResult = attemptAuthentication(request, response);
if (authResult == null) {
// return immediately as subclass has indicated that it hasn't completed
// authentication
return;
}
sessionStrategy.onAuthentication(authResult, request, response);
}
catch (InternalAuthenticationServiceException failed) {
logger.error(
"An internal error occurred while trying to authenticate the user.",
failed);
unsuccessfulAuthentication(request, response, failed);
return;
}
catch (AuthenticationException failed) {
// Authentication failed
unsuccessfulAuthentication(request, response, failed);
return;
}
// Authentication success
if (continueChainBeforeSuccessfulAuthentication) {
chain.doFilter(request, response);
}
successfulAuthentication(request, response, chain, authResult);
}
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