分布式項目和傳統項目的區別就是，分布式項目有多個服務，每一個服務僅僅只實現一套系統中一個或幾個功能，所有的服務組合在一起才能實現系統的完整功能。這會產生一個問題，多個服務之間session不能共享，你在其中一個服務中登錄了，登錄信息保存在這個服務的session中，別的服務不知道啊，所以你訪問別的服務還得在重新登錄一次，對用戶十分不友好。為了解決這個問題，于是就產生了單點登錄：

**jwt單點登錄：**就是用戶在登錄服務登錄成功后，登錄服務會產生向前端響應一個token（令牌），以后用戶再訪問系統的資源的時候都要帶上這個令牌，各大服務對這個令牌進行驗證（令牌是否過期，令牌是否被篡改），驗證通過了，可以訪問資源，同時，令牌中也會攜帶一些不重要的信息，比如用戶名，權限。通過解析令牌就能知道當前登錄的用戶和用戶所擁有的權限。

下面我們就來寫一個案例項目看看具體如何使用

1.1 父工程cloud-security

這是父工程所需要的包

<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath/></parent><dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> </dependency></dependencies>

1.2 公共工程 security-common

這是公共工程所需要的包

<dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId></dependency><dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.60</version></dependency><!--jwt所需包--><dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-api</artifactId> <version>0.11.2</version></dependency><dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-impl</artifactId> <version>0.11.2</version> <scope>runtime</scope></dependency><dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-jackson</artifactId> <!-- or jjwt-gson if Gson is preferred --> <version>0.11.2</version> <scope>runtime</scope></dependency>

1.3 認證服務security-sever

這個服務僅僅只有兩項功能：

（1）用戶登錄，頒發令牌

（2）用戶注冊

我們這里只實現第一個功能

1.3.1 認證服務所需的包

<dependency> <groupId>cn.lx.security</groupId> <artifactId>security-common</artifactId> <version>1.0-SNAPSHOT</version></dependency><dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId></dependency><!--通用mapper--><dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper-spring-boot-starter</artifactId> <version>2.0.4</version></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId></dependency>

1.3.2 配置application.yml

這里面的配置沒什么好說的，都很簡單

server: port: 8080spring: datasource: url: jdbc:mysql:///security_authority?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC username: root password: driver-class-name: com.mysql.cj.jdbc.Driver thymeleaf: cache: false main: allow-bean-definition-overriding: truemybatis: type-aliases-package: cn.lx.security.doamin configuration: #駝峰 map-underscore-to-camel-case: truelogging: level: cn.lx.security: debug

1.3.3 導入domain,dao,service，config

這個可以在上篇文檔中找到，我們只需要service中的loadUserByUsername方法及其所調用dao中的方法

完整項目在我的github中，地址：git@github.com:lx972/cloud-security.git

配置文件我們也從上篇中復制過來MvcConfig，SecurityConfig

1.3.4 測試

訪問http://localhost:8080/loginPage成功出現登錄頁面，說明認證服務的骨架搭建成功了

1.4 資源服務security-resource1

實際項目中會有很多資源服務，我只演示一個

為了簡單，資源服務不使用數據庫

1.4.1 資源服務所需的包

<dependency> <groupId>cn.lx.security</groupId> <artifactId>security-common</artifactId> <version>1.0-SNAPSHOT</version></dependency>

1.4.2 配置application.yml

server: port: 8090logging: level: cn.lx.security: debug

1.4.3 controller

擁有ORDER_LIST權限的才能訪問

@RestController@RequestMapping('/order')public class OrderController { //@Secured('ORDER_LIST') @PreAuthorize(value = 'hasAuthority(’ORDER_LIST’)') @RequestMapping('/findAll') public String findAll(){ return 'order-list'; }}

擁有PRODUCT_LIST權限的才能訪問

@RestController@RequestMapping('/product')public class ProductController { //@Secured('PRODUCT_LIST') @PreAuthorize(value = 'hasAuthority(’PRODUCT_LIST’)') @RequestMapping('/findAll') public String findAll(){ return 'product-list'; }}

1.4.4 security配置類

@Configuration@EnableWebSecurity//這個注解先不要加//@EnableGlobalMethodSecurity(prePostEnabled = true)public class SecurityConfig extends WebSecurityConfigurerAdapter { /** * Override this method to configure the {@link HttpSecurity}. Typically subclasses * should not invoke this method by calling super as it may override their * configuration. The default configuration is: * * <pre> * http.authorizeRequests().anyRequest().authenticated().and().formLogin().and().httpBasic(); * </pre> * * @param http the {@link HttpSecurity} to modify * @throws Exception if an error occurs */ @Override protected void configure(HttpSecurity http) throws Exception { http .csrf().disable() .authorizeRequests().anyRequest().authenticated(); }}

1.4.5 測試

訪問http://localhost:8090/order/findAll成功打印出order-list，服務搭建成功。

首先，我們必須知道我們的項目是前后端分離的項目，所以我們不能由后端控制頁面跳轉了，只能返回json串通知前端登錄成功，然后前端根據后端返回的信息控制頁面跳轉。

2.1 登錄成功或者登錄失敗后的源碼分析

UsernamePasswordAuthenticationFilter中登錄成功后走successfulAuthentication方法

/** * Default behaviour for successful authentication.認證成功之后的默認操作 * <ol> * <li>Sets the successful <tt>Authentication</tt> object on the * {@link SecurityContextHolder}</li> * <li>Informs the configured <tt>RememberMeServices</tt> of the successful login</li> * <li>Fires an {@link InteractiveAuthenticationSuccessEvent} via the configured * <tt>ApplicationEventPublisher</tt></li> * <li>Delegates additional behaviour to the {@link AuthenticationSuccessHandler}.</li> * </ol> * * Subclasses can override this method to continue the {@link FilterChain} after * successful authentication. * @param request * @param response * @param chain * @param authResult the object returned from the <tt>attemptAuthentication</tt> * method. * @throws IOException * @throws ServletException */protected void successfulAuthentication(HttpServletRequest request,HttpServletResponse response, FilterChain chain, Authentication authResult)throws IOException, ServletException {if (logger.isDebugEnabled()) {logger.debug('Authentication success. Updating SecurityContextHolder to contain: '+ authResult);} //將已通過認證的Authentication保存到securityContext容器中，應為后面的過濾器需要使用SecurityContextHolder.getContext().setAuthentication(authResult); //記住我rememberMeServices.loginSuccess(request, response, authResult);// Fire eventif (this.eventPublisher != null) {eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent(authResult, this.getClass()));} //這個方法你點進去，就會發現，真正作業面跳轉是在這里successHandler.onAuthenticationSuccess(request, response, authResult);}

UsernamePasswordAuthenticationFilter中登錄成功后走unsuccessfulAuthentication方法

/** * Default behaviour for unsuccessful authentication.認證失敗之后的默認操作 * <ol> * <li>Clears the {@link SecurityContextHolder}</li> * <li>Stores the exception in the session (if it exists or * <tt>allowSesssionCreation</tt> is set to <tt>true</tt>)</li> * <li>Informs the configured <tt>RememberMeServices</tt> of the failed login</li> * <li>Delegates additional behaviour to the {@link AuthenticationFailureHandler}.</li> * </ol> */protected void unsuccessfulAuthentication(HttpServletRequest request,HttpServletResponse response, AuthenticationException failed)throws IOException, ServletException {SecurityContextHolder.clearContext();if (logger.isDebugEnabled()) {logger.debug('Authentication request failed: ' + failed.toString(), failed);logger.debug('Updated SecurityContextHolder to contain null Authentication');logger.debug('Delegating to authentication failure handler ' + failureHandler);} //記住我失敗rememberMeServices.loginFail(request, response); //失敗后的頁面跳轉都在這里failureHandler.onAuthenticationFailure(request, response, failed);}

2.2 重寫successfulAuthentication和unsuccessfulAuthentication方法

我們繼承UsernamePasswordAuthenticationFilter這個過濾器

public class AuthenticationFilter extends UsernamePasswordAuthenticationFilter { /** * 這個方法必須有 * 在過濾器創建的時候手動將AuthenticationManager對象給這個過濾器使用 * @param authenticationManager 這個對象在自己寫的SecurityConfig里面 */ public AuthenticationFilter(AuthenticationManager authenticationManager) { super.setAuthenticationManager(authenticationManager); } /** * Default behaviour for successful authentication.認證成功之后的默認操作 * @param request * @param response * @param chain * @param authResult the object returned from the <tt>attemptAuthentication</tt> * method. * @throws IOException * @throws ServletException */ @Override protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException { //認證成功的對象放入securityContext容器中 SecurityContextHolder.getContext().setAuthentication(authResult); // Fire event if (this.eventPublisher != null) { eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent( authResult, this.getClass())); } //創建令牌 Map<String, Object> claims=new HashMap<>(); SysUser sysUser = (SysUser) authResult.getPrincipal(); claims.put('username',sysUser.getUsername()); claims.put('authorities',authResult.getAuthorities()); //這個方法在下面介紹 String jwt = JwtUtil.createJwt(claims); //直接返回json ResponseUtil.responseJson(new Result('200', '登錄成功',jwt),response); } /** * Default behaviour for unsuccessful authentication. * @param request * @param response * @param failed */ @Override protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed) throws IOException, ServletException { //清理容器中保存的認證對象 SecurityContextHolder.clearContext(); //直接返回json ResponseUtil.responseJson(new Result('500', '登錄失敗'),response); }}

2.3 令牌創建

String jwt = JwtUtil.createJwt(claims);

這個方法干了什么事呢

/** * 創建令牌 * @param claims * @return */public static String createJwt(Map<String, Object> claims){ //獲取私鑰 String priKey = KeyUtil.readKey('privateKey.txt'); //將string類型的私鑰轉換成PrivateKey，jwt只能接受PrivateKey的私鑰 PKCS8EncodedKeySpec priPKCS8 = null; try { priPKCS8 = new PKCS8EncodedKeySpec(new BASE64Decoder().decodeBuffer(priKey)); KeyFactory keyf = KeyFactory.getInstance('RSA'); PrivateKey privateKey = keyf.generatePrivate(priPKCS8); //創建令牌 String jws = Jwts.builder() //設置令牌過期時間30分鐘 .setExpiration(new Date(System.currentTimeMillis()+1000*60*30)) //為令牌設置額外的信息，這里我們設置用戶名和權限，還可以根據需要繼續添加 .addClaims(claims) //指定加密類型為rsa .signWith(privateKey, SignatureAlgorithm.RS256) //得到令牌 .compact(); log.info('創建令牌成功：'+jws); return jws; } catch (Exception e) { throw new RuntimeException('創建令牌失敗'); }}

獲取秘鑰的方法

public class KeyUtil { /** * 讀取秘鑰 * @param keyName * @return */ public static String readKey(String keyName){ //文件必須放在resources根目錄下 ClassPathResource resource=new ClassPathResource(keyName); String key =null; try { InputStream is = resource.getInputStream(); key = StreamUtils.copyToString(is, Charset.defaultCharset()); }catch (Exception e){ throw new RuntimeException('讀取秘鑰錯誤'); } if (key==null){ throw new RuntimeException('秘鑰為空'); } return key; }}

2.4 響應json格式數據給前端

封裝成了一個工具類

public class ResponseUtil { /** * 將結果以json格式返回 * @param result 返回結果 * @param response * @throws IOException */ public static void responseJson(Result result, HttpServletResponse response) throws IOException { response.setContentType('application/json;charset=utf-8'); response.setStatus(200); PrintWriter writer = response.getWriter(); writer.write(JSON.toJSONString(result)); writer.flush(); writer.close(); }}

返回結果

@Data@AllArgsConstructor@NoArgsConstructorpublic class Result { private String code; private String msg; private Object data; public Result(String code, String msg) { this.code = code; this.msg = msg; }}3 認證服務實現令牌驗證和解析

除了security配置類中配置的需要忽略的請求之外，其他所有請求必須驗證請求頭中是否攜帶令牌，沒有令牌直接響應json數據，否則就驗證和解析令牌。

security中有一個過濾器是實現令牌BasicAuthenticationFilter認證的，只不過他是basic的，沒關系，我們繼承它，然后重寫解析basic的方法

3.1 源碼分析

@Overrideprotected void doFilterInternal(HttpServletRequest request,HttpServletResponse response, FilterChain chain) throws IOException, ServletException { final boolean debug = this.logger.isDebugEnabled(); //獲取請求頭中Authorization的值 String header = request.getHeader('Authorization'); if (header == null || !header.toLowerCase().startsWith('basic ')) { //值不符合條件直接放行 chain.doFilter(request, response); return; } try { //就是解析Authorization String[] tokens = extractAndDecodeHeader(header, request); assert tokens.length == 2; //tokens[0]用戶名 tokens[1]密碼 String username = tokens[0]; if (debug) { this.logger .debug('Basic Authentication Authorization header found for user ’' + username + '’'); } //判斷是否需要認證（容器中有沒有該認證對象） if (authenticationIsRequired(username)) { //創建一個對象 UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken( username, tokens[1]); authRequest.setDetails( this.authenticationDetailsSource.buildDetails(request)); //進行認證，我們不關心它如何認證，我們需要按自己的方法對令牌認證解析 Authentication authResult = this.authenticationManager .authenticate(authRequest); if (debug) { this.logger.debug('Authentication success: ' + authResult); } //已認證的對象保存到securityContext中 SecurityContextHolder.getContext().setAuthentication(authResult); //記住我 this.rememberMeServices.loginSuccess(request, response, authResult); onSuccessfulAuthentication(request, response, authResult); } } catch (AuthenticationException failed) { SecurityContextHolder.clearContext(); if (debug) { this.logger.debug('Authentication request for failed: ' + failed); } this.rememberMeServices.loginFail(request, response); onUnsuccessfulAuthentication(request, response, failed); if (this.ignoreFailure) { chain.doFilter(request, response); } else { this.authenticationEntryPoint.commence(request, response, failed); } return; } chain.doFilter(request, response);}

3.2 重寫doFilterInternal方法

繼承BasicAuthenticationFilter

public class TokenVerifyFilter extends BasicAuthenticationFilter { /** * Creates an instance which will authenticate against the supplied * {@code AuthenticationManager} and which will ignore failed authentication attempts, * allowing the request to proceed down the filter chain. * 在過濾器創建的時候手動將AuthenticationManager對象給這個過濾器使用 * @param authenticationManager 這個對象在自己寫的SecurityConfig里面 */ public TokenVerifyFilter(AuthenticationManager authenticationManager) { super(authenticationManager); } /** * 過濾請求，判斷是否攜帶令牌 * @param request * @param response * @param chain * @throws IOException * @throws ServletException */ @Override protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException { String header = request.getHeader('Authorization'); if (header == null || !header.toLowerCase().startsWith('bearer ')) { //直接返回json ResponseUtil.responseJson(new Result('403', '用戶未登錄'),response); return; } //得到jwt令牌 String jwt = StringUtils.replace(header, 'bearer ', ''); //解析令牌 String[] tokens = JwtUtil.extractAndDecodeJwt(jwt); //用戶名 String username = tokens[0]; //權限 List<SysPermission> authorities= JSON.parseArray(tokens[1], SysPermission.class); UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken( username, null, authorities ); //放入SecurityContext容器中 SecurityContextHolder.getContext().setAuthentication(authRequest); chain.doFilter(request, response); }}

3.3 驗證解析令牌

/** * 解析令牌 * @param compactJws * @return */public static String decodeJwt(String compactJws){ //獲取公鑰 String pubKey = KeyUtil.readKey('publicKey.txt'); //將string類型的私鑰轉換成PublicKey，jwt只能接受PublicKey的公鑰 KeyFactory keyFactory; try { X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec( new BASE64Decoder().decodeBuffer(pubKey)); keyFactory = KeyFactory.getInstance('RSA'); PublicKey publicKey = keyFactory.generatePublic(bobPubKeySpec); Claims body = Jwts.parserBuilder().setSigningKey(publicKey).build().parseClaimsJws(compactJws).getBody(); String jwtString = JSON.toJSONString(body); //OK, we can trust this JWT log.info('解析令牌成功：'+jwtString); return jwtString; } catch (Exception e) { throw new RuntimeException('解析令牌失敗'); }}/** * 解析令牌并獲取用戶名和權限 * @param compactJws * @return String[0]用戶名 * String[1]權限 */public static String[] extractAndDecodeJwt(String compactJws){ //獲取令牌的內容 String decodeJwt = decodeJwt(compactJws); JSONObject jsonObject = JSON.parseObject(decodeJwt); String username = jsonObject.getString('username'); String authorities = jsonObject.getString('authorities'); return new String[] { username, authorities };}

3.4 修改security配置類

將自定義過濾器加入過濾器鏈

@Configuration@EnableWebSecuritypublic class SecurityConfig extends WebSecurityConfigurerAdapter { @Autowired private IUserService iUserService; @Autowired private BCryptPasswordEncoder bCryptPasswordEncoder; /** * 只有這個配置類有AuthenticationManager對象，我們要把這個類中的這個對象放入容器中 * 這樣在別的地方就可以自動注入了 * @return * @throws Exception */ @Bean @Override public AuthenticationManager authenticationManager() throws Exception { AuthenticationManager authenticationManager = super.authenticationManagerBean(); return authenticationManager; } /** * Used by the default implementation of {@link #authenticationManager()} to attempt * to obtain an {@link AuthenticationManager}. If overridden, the * {@link AuthenticationManagerBuilder} should be used to specify the * {@link AuthenticationManager}. * * <p> * The {@link #authenticationManagerBean()} method can be used to expose the resulting * {@link AuthenticationManager} as a Bean. The {@link #userDetailsServiceBean()} can * be used to expose the last populated {@link UserDetailsService} that is created * with the {@link AuthenticationManagerBuilder} as a Bean. The * {@link UserDetailsService} will also automatically be populated on * {@link HttpSecurity#getSharedObject(Class)} for use with other * {@link SecurityContextConfigurer} (i.e. RememberMeConfigurer ) * </p> * * <p> * For example, the following configuration could be used to register in memory * authentication that exposes an in memory {@link UserDetailsService}: * </p> * * <pre> * &#064;Override * protected void configure(AuthenticationManagerBuilder auth) { * auth * // enable in memory based authentication with a user named * // &quot;user&quot; and &quot;admin&quot; * .inMemoryAuthentication().withUser(&quot;user&quot;).password(&quot;password&quot;).roles(&quot;USER&quot;).and() * .withUser(&quot;admin&quot;).password(&quot;password&quot;).roles(&quot;USER&quot;, &quot;ADMIN&quot;); * } * * // Expose the UserDetailsService as a Bean * &#064;Bean * &#064;Override * public UserDetailsService userDetailsServiceBean() throws Exception { * return super.userDetailsServiceBean(); * } * * </pre> * * @param auth the {@link AuthenticationManagerBuilder} to use * @throws Exception */ @Override protected void configure(AuthenticationManagerBuilder auth) throws Exception { //在內存中注冊一個賬號 //auth.inMemoryAuthentication().withUser('user').password('{noop}123').roles('USER'); //連接數據庫，使用數據庫中的賬號 auth.userDetailsService(iUserService).passwordEncoder(bCryptPasswordEncoder); } /** * Override this method to configure {@link WebSecurity}. For example, if you wish to * ignore certain requests. * * @param web */ @Override public void configure(WebSecurity web) throws Exception { web.ignoring().antMatchers('/css/**', '/img/**', '/plugins/**', '/favicon.ico', '/loginPage'); } /** * Override this method to configure the {@link HttpSecurity}. Typically subclasses * should not invoke this method by calling super as it may override their * configuration. The default configuration is: * * <pre> * http.authorizeRequests().anyRequest().authenticated().and().formLogin().and().httpBasic(); * </pre> * * @param http the {@link HttpSecurity} to modify * @throws Exception if an error occurs */ @Override protected void configure(HttpSecurity http) throws Exception { http.csrf().disable() .httpBasic() .and() .authorizeRequests() .anyRequest().authenticated() .and() /** * 不要將自定義過濾器加component注解，而是在這里直接創建一個過濾器對象加入到過濾器鏈中，并傳入authenticationManager * 啟動后，過濾器鏈中會同時出現自定義過濾器和他的父類，他會自動覆蓋，并不會過濾兩次 * * 使用component注解會產生很多問題： * 1. web.ignoring()會失效，上面的資源還是會經過自定義的過濾器 * 2.過濾器鏈中出現的是他們父類中的名字 * 3.登錄的時候（訪問/login），一直使用匿名訪問，不會去數據庫中查詢 */ .addFilterAt(new AuthenticationFilter(super.authenticationManager()), UsernamePasswordAuthenticationFilter.class) .addFilterAt(new TokenVerifyFilter(super.authenticationManager()), BasicAuthenticationFilter.class) //.formLogin().loginPage('/login.jsp').loginProcessingUrl('/login').defaultSuccessUrl('/index.jsp').failureForwardUrl('/failer.jsp').permitAll() .formLogin().loginPage('/loginPage').loginProcessingUrl('/login').permitAll() .and() .logout().logoutUrl('/logout').logoutSuccessUrl('/loginPage').invalidateHttpSession(true).permitAll(); }}4 資源服務實現令牌驗證和解析

復制認證服務的TokenVerifyFilter到資源服務

然后修改security的配置文件

@Configuration@EnableWebSecurity@EnableGlobalMethodSecurity(prePostEnabled = true)public class SecurityConfig extends WebSecurityConfigurerAdapter { /** * Override this method to configure the {@link HttpSecurity}. Typically subclasses * should not invoke this method by calling super as it may override their * configuration. The default configuration is: * * <pre> * http.authorizeRequests().anyRequest().authenticated().and().formLogin().and().httpBasic(); * </pre> * * @param http the {@link HttpSecurity} to modify * @throws Exception if an error occurs */ @Override protected void configure(HttpSecurity http) throws Exception { http .csrf().disable() .authorizeRequests().anyRequest().authenticated() .and() //禁用session .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS) .and() //添加自定義過濾器 .addFilterAt(new TokenVerifyFilter(super.authenticationManager()), BasicAuthenticationFilter.class); }}

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