Spring Security OAuth2+CAS（添加cas模式）

约定不等于承诺〃 2022-12-21 03:29 275阅读 0赞

# 前言 #

Spring Security OAuth2 自带有4中模式，有些特殊情况是需要自定义。（本文的前提是需要知道如何添加自定义的模式）  
现在的需求是现有的Spring Security OAuth2的认证对接cas认证中心。

# maven #

<dependency>
    			<groupId>org.springframework.security</groupId>
    			<artifactId>spring-security-cas</artifactId>
    			<version>5.0.6.RELEASE</version>
    		</dependency>

# 添加CasTicketTokenGranter #

**这里的grant\_type 就是这里定义的cas\_ticket**

public class CasTicketTokenGranter extends AbstractTokenGranter { 
    
        private static final String GRANT_TYPE = "cas_ticket";
    
        private final AuthenticationManager authenticationManager;
    
        public CasTicketTokenGranter(AuthenticationManager authenticationManager,
                                     AuthorizationServerTokenServices tokenServices, ClientDetailsService clientDetailsService, OAuth2RequestFactory requestFactory) { 
            this(authenticationManager, tokenServices, clientDetailsService, requestFactory, GRANT_TYPE);
        }
    
        protected CasTicketTokenGranter(AuthenticationManager authenticationManager, AuthorizationServerTokenServices tokenServices,
                                        ClientDetailsService clientDetailsService, OAuth2RequestFactory requestFactory, String grantType) { 
            super(tokenServices, clientDetailsService, requestFactory, grantType);
            this.authenticationManager = authenticationManager;
        }
    
        @Override
        public OAuth2AccessToken grant(String grantType, TokenRequest tokenRequest) { 
            OAuth2AccessToken token = super.grant(grantType, tokenRequest);
            if (token != null) { 
                DefaultOAuth2AccessToken norefresh = new DefaultOAuth2AccessToken(token);
                // The spec says that cas ticket should not be allowed to get a refresh token
                norefresh.setRefreshToken(null);
                token = norefresh;
            }
            return token;
        }
    
        @Override
        protected OAuth2Authentication getOAuth2Authentication(ClientDetails client, TokenRequest tokenRequest) { 
    
            Map<String, String> parameters = new LinkedHashMap<String, String>(tokenRequest.getRequestParameters());
            String username = CasAuthenticationFilter.CAS_STATEFUL_IDENTIFIER;
            String password = parameters.get("ticket");
    
            if (password == null) { 
                throw new InvalidRequestException("A cas ticket must be supplied.");
            }
    
            Authentication userAuth = new UsernamePasswordAuthenticationToken(username, password);
            ((AbstractAuthenticationToken) userAuth).setDetails(parameters);
            try { 
                userAuth = authenticationManager.authenticate(userAuth);
            }
            catch (AccountStatusException ase) { 
                //covers expired, locked, disabled cases (mentioned in section 5.2, draft 31)
                throw new InvalidGrantException(ase.getMessage());
            }
            catch (BadCredentialsException e) { 
                // If the ticket is wrong the spec says we should send 400/invalid grant
                throw new InvalidGrantException(e.getMessage());
            }
            if (userAuth == null || !userAuth.isAuthenticated()) { 
                throw new InvalidGrantException("Could not authenticate ticket: " + password);
            }
    
            OAuth2Request storedOAuth2Request = getRequestFactory().createOAuth2Request(client, tokenRequest);
            return new OAuth2Authentication(storedOAuth2Request, userAuth);
        }
    }

# tokenGranters中添加自定义的cas模式 #

注意看最下面

private List<TokenGranter> getDefaultTokenGranters() { 
            AuthorizationServerTokenServices tokenServices = tokenServices();
            AuthorizationCodeServices authorizationCodeServices = authorizationCodeServices();
            OAuth2RequestFactory requestFactory = requestFactory();
    
            List<TokenGranter> tokenGranters = new ArrayList<TokenGranter>();
            // 添加授权码模式
            tokenGranters.add(new AuthorizationCodeTokenGranter(tokenServices, authorizationCodeServices, clientDetailsService, requestFactory));
            // 添加刷新令牌的模式
            tokenGranters.add(new RefreshTokenGranter(tokenServices, clientDetailsService, requestFactory));
            // 添加隐士授权模式
            tokenGranters.add(new ImplicitTokenGranter(tokenServices, clientDetailsService, requestFactory));
            // 添加客户端模式
            tokenGranters.add(new ClientCredentialsTokenGranter(tokenServices, clientDetailsService, requestFactory));
            if (authenticationManager != null) { 
                // 添加密码模式
                tokenGranters.add(new ResourceOwnerPasswordTokenGranter(authenticationManager, tokenServices, clientDetailsService, requestFactory));
                // 添加自定义授权模式（手机号码）
                tokenGranters.add(new MobileCodeTokenGranter(authenticationManager, tokenServices, clientDetailsService, requestFactory));
                // 添加自定义授权模式（cas)
                tokenGranters.add(new CasTicketTokenGranter(authenticationManager, tokenServices, clientDetailsService, requestFactory));
            }
            return tokenGranters;
        }

# 添加CasAuthenticationProvider #

**注意cas携带的service地址要和 serviceProperties.setService()这里的地址一样**

public static String casServerUrlPrefix="http://127.0.0.1:8081/cas";
    	@Bean("pgtStorage")
        public ProxyGrantingTicketStorageImpl proxyGrantingTicketStorageImpl(){ 
            return new ProxyGrantingTicketStorageImpl();
        }
    
        @Bean("casAuthenticationProvider")
        public CasAuthenticationProvider casAuthenticationProvider(){ 
            CasAuthenticationProvider authenticationProvider=new CasAuthenticationProvider();
            authenticationProvider.setKey("casProvider") ;
            authenticationProvider.setAuthenticationUserDetailsService(OauthCasService);
            Cas20ProxyTicketValidator ticketValidator=new Cas20ProxyTicketValidator(casServerUrlPrefix);
            ticketValidator.setAcceptAnyProxy(true);//允许所有代理回调链接
            ticketValidator.setProxyGrantingTicketStorage(proxyGrantingTicketStorageImpl());
            authenticationProvider.setTicketValidator(ticketValidator);
            authenticationProvider.setServiceProperties(serviceProperties());
            return authenticationProvider;
        }
    
        @Bean
        public ServiceProperties serviceProperties(){ 
            ServiceProperties serviceProperties=new ServiceProperties();
            serviceProperties.setService("http://127.0.0.1:8881/base/oauth/toke");
            serviceProperties.setAuthenticateAllArtifacts(true);
            return serviceProperties;
        }

# AuthenticationManagerBuilder中添加Provider #

@Override
        protected void configure(AuthenticationManagerBuilder auth) throws Exception { 
            auth.authenticationProvider(casAuthenticationProvider()).userDetailsService(OauthUserService).passwordEncoder(passwordEncoder()).and().authenticationProvider(mobileAuthenticationProvider());
        }

# OauthCasServiceImpl #

@Service("OauthCasService")
    public class OauthCasServiceImpl implements AuthenticationUserDetailsService<CasAssertionAuthenticationToken> { 
    
    	@Autowired
    	private com.datanew.service.UserService UserService;
    
    	@Override
    	public UserDetails loadUserDetails(CasAssertionAuthenticationToken token) throws UsernameNotFoundException { 
    		String name = token.getName();
    		System.out.println("获得的用户名："+name);
    		BaseOperator userinfo = UserService.getUserByUsername(name);
    		if (userinfo==null){ 
    			throw new UsernameNotFoundException(name+"不存在");
    		}
    		User user =  new User(name,userinfo.getPassword(), AuthorityUtils.createAuthorityList("ROLE_ADMIN"));
    		return new OauthUser(userinfo,user);
    	}
    }
    
    public interface OauthCasService extends UserDetailsService { 
    
    }

# cas登录流程 #

需要cas认证中心支持restfult模式

1.  客户端使用用户名密码获取TGT
2.  使用TGT获取ticket
3.  使用ticket获取access\_token
4.  一般来说需要自己封装一个接口获取token并把token设置到cookie中并重定向到前端项目

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