Apache Shiro是一个强大易用的Java安全框架，提供了认证、授权、加密和会话管理等功能： 认证是指用户身份识别，常被称为用户“登录”；授权是指访问控制；密码加密是指保护或隐藏数据防止被偷窥；会话管理是指每用户相关的时间敏感的状态。其他关于Shiro这里就不介绍了，下面本站www.yoodb.com为大家说一说Shiro权限管理框架集成Cas扩展自定义CasRealm类，来完成Cas单点登录权限管理的功能。
搭建CAS服务端此处略过，本文采用cas-client-3.2.1版本为大家讲解，首先下载cas-client客户端项目，将/cas-client/modules/cas-client-core-3.2.1.jar包放到项目应用中， shrio关于CAS单点登录具体配置文件内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:cache="http://www.springframework.org/schema/cache"
xmlns:p="http://www.springframework.org/schema/p" xmlns:c="http://www.springframework.org/schema/c"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd">
<!-- 权限资源配置 -->
<bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
<property name="securityManager" ref="securityManager" />
<!-- 设定用户的登录链接，这里为cas登录页面的链接地址可配置回调地址 -->
<property name="loginUrl" value="${shiro.loginUrl}" />
<property name="filters">
<map>
<!-- 添加casFilter到shiroFilter -->
<entry key="casFilter" value-ref="casFilter" />
<entry key="logoutFilter" value-ref="logoutFilter" />
</map>
</property>
<property name="filterChainDefinitions">
<value>
/shiro-cas = casFilter
/logout = logoutFilter
/users/** = user
</value>
</property>
</bean>
<bean id="casFilter" class="org.apache.shiro.cas.CasFilter">
<!-- 配置验证错误时的失败页面 -->
<property name="failureUrl" value="${shiro.failureUrl}" />
<property name="successUrl" value="${shiro.successUrl}" />
</bean>
<bean id="logoutFilter" class="org.apache.shiro.web.filter.authc.LogoutFilter">
<!-- 配置验证错误时的失败页面 -->
<property name="redirectUrl" value="${shiro.logoutUrl}" />
</bean>
<bean id="casRealm" class="com.spring.mybatis.realm.UserRealm">
<!-- 认证通过后的默认角色 -->
<property name="defaultRoles" value="ROLE_USER" />
<!-- cas服务端地址前缀 -->
<property name="casServerUrlPrefix" value="${shiro.cas.serverUrlPrefix}" />
<!-- 应用服务地址，用来接收cas服务端票据 -->
<property name="casService" value="${shiro.cas.service}" />
</bean>
<!-- 安全管理器 -->
<bean id="securityManager" class="org.apache.shiro.web.mgt.DefaultWebSecurityManager">
<property name="sessionManager" ref="sessionManager" />
<property name="subjectFactory" ref="casSubjectFactory"></property>
<property name="realm" ref="casRealm" />
</bean>
<!-- 如果要实现cas的remember me的功能，需要用到下面这个bean，并设置到securityManager的subjectFactory中 -->
<bean id="casSubjectFactory" class="org.apache.shiro.cas.CasSubjectFactory"></bean>
<bean class="org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor">
<property name="securityManager" ref="securityManager" />
</bean>
<!-- 会话管理器 -->
<bean id="sessionManager" class="org.apache.shiro.web.session.mgt.DefaultWebSessionManager">
<property name="globalSessionTimeout" value="3600000" />
<property name="sessionDAO" ref="sessionDAO" />
</bean>
<!-- 会话读写实现类 -->
<bean id="sessionDAO" class="com.spring.mybatis.redis.RedisSessionDAO"/>
<bean id="lifecycleBeanPostProcessor" class="org.apache.shiro.spring.LifecycleBeanPostProcessor"></bean>
<bean
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="staticMethod"
value="org.apache.shiro.SecurityUtils.setSecurityManager"></property>
<property name="arguments" ref="securityManager"></property>
</bean>
</beans>上述配置具体含义在注释中本人已经写的很详细，还有什么问题可以留言，此处就不一一介绍了，咱们继续。
关于CAS单点登录需要重写casrealm类，上述配置com.spring.mybatis.realm.UserRealm类，就是我重写的类文件，主要是为了方便分配本地系统权限体系，shiro-cas提供的默认CasRealm功能比较有限,不能满足动态角色体系。shiro-cas版本采用的是1.2.3，maven下载shiro安全框架和cas单点登录相关的jar包pom.xml配置如下：
<!-- apache shiro 相关jar -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-aspectj</artifactId>
<version>${shiro.version}</version>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.4.2</version>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>${shiro.version}</version>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-core</artifactId>
<version>${shiro.version}</version>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-cas</artifactId>
<version>${shiro.version}</version>
</dependency>下面可以看看原始的CasRealm源码，它是不能满足我们的开发需求功能的，源码具体如下：
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.shiro.cas;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.SimplePrincipalCollection;
import org.apache.shiro.util.CollectionUtils;
import org.apache.shiro.util.StringUtils;
import org.jasig.cas.client.authentication.AttributePrincipal;
import org.jasig.cas.client.validation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* This realm implementation acts as a CAS client to a CAS server for authentication and basic authorization.
* <p/>
* This realm functions by inspecting a submitted {@link org.apache.shiro.cas.CasToken CasToken} (which essentially
* wraps a CAS service ticket) and validates it against the CAS server using a configured CAS
* {@link org.jasig.cas.client.validation.TicketValidator TicketValidator}.
* <p/>
* The {@link #getValidationProtocol() validationProtocol} is {@code CAS} by default, which indicates that a
* a {@link org.jasig.cas.client.validation.Cas20ServiceTicketValidator Cas20ServiceTicketValidator}
* will be used for ticket validation. You can alternatively set
* or {@link org.jasig.cas.client.validation.Saml11TicketValidator Saml11TicketValidator} of CAS client. It is based on
* {@link AuthorizingRealm AuthorizingRealm} for both authentication and authorization. User id and attributes are retrieved from the CAS
* service ticket validation response during authentication phase. Roles and permissions are computed during authorization phase (according
* to the attributes previously retrieved).
*
* @since 1.2
*/
public class CasRealm extends AuthorizingRealm {
// default name of the CAS attribute for remember me authentication (CAS 3.4.10+)
public static final String DEFAULT_REMEMBER_ME_ATTRIBUTE_NAME = "longTermAuthenticationRequestTokenUsed";
public static final String DEFAULT_VALIDATION_PROTOCOL = "CAS";
private static Logger log = LoggerFactory.getLogger(CasRealm.class);
// this is the url of the CAS server (example : http://host:port/cas)
private String casServerUrlPrefix;
// this is the CAS service url of the application (example : http://host:port/mycontextpath/shiro-cas)
private String casService;
/* CAS protocol to use for ticket validation : CAS (default) or SAML :
- CAS protocol can be used with CAS server version < 3.1 : in this case, no user attributes can be retrieved from the
CAS ticket validation response (except if there are some customizations on CAS server side)
- SAML protocol can be used with CAS server version >= 3.1 : in this case, user attributes can be extracted from the
CAS ticket validation response
*/
private String validationProtocol = DEFAULT_VALIDATION_PROTOCOL;
// default name of the CAS attribute for remember me authentication (CAS 3.4.10+)
private String rememberMeAttributeName = DEFAULT_REMEMBER_ME_ATTRIBUTE_NAME;
// this class from the CAS client is used to validate a service ticket on CAS server
private TicketValidator ticketValidator;
// default roles to applied to authenticated user
private String defaultRoles;
// default permissions to applied to authenticated user
private String defaultPermissions;
// names of attributes containing roles
private String roleAttributeNames;
// names of attributes containing permissions
private String permissionAttributeNames;
public CasRealm() {
setAuthenticationTokenClass(CasToken.class);
}
@Override
protected void onInit() {
super.onInit();
ensureTicketValidator();
}
protected TicketValidator ensureTicketValidator() {
if (this.ticketValidator == null) {
this.ticketValidator = createTicketValidator();
}
return this.ticketValidator;
}
protected TicketValidator createTicketValidator() {
String urlPrefix = getCasServerUrlPrefix();
if ("saml".equalsIgnoreCase(getValidationProtocol())) {
return new Saml11TicketValidator(urlPrefix);
}
return new Cas20ServiceTicketValidator(urlPrefix);
}
/**
* Authenticates a user and retrieves its information.
*
* @param token the authentication token
* @throws AuthenticationException if there is an error during authentication.
*/
@Override
@SuppressWarnings("unchecked")
protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
CasToken casToken = (CasToken) token;
if (token == null) {
return null;
}
String ticket = (String)casToken.getCredentials();
if (!StringUtils.hasText(ticket)) {
return null;
}
TicketValidator ticketValidator = ensureTicketValidator();
try {
// contact CAS server to validate service ticket
Assertion casAssertion = ticketValidator.validate(ticket, getCasService());
// get principal, user id and attributes
AttributePrincipal casPrincipal = casAssertion.getPrincipal();
String userId = casPrincipal.getName();
log.debug("Validate ticket : {} in CAS server : {} to retrieve user : {}", new Object[]{
ticket, getCasServerUrlPrefix(), userId
});
Map<String, Object> attributes = casPrincipal.getAttributes();
// refresh authentication token (user id + remember me)
casToken.setUserId(userId);
String rememberMeAttributeName = getRememberMeAttributeName();
String rememberMeStringValue = (String)attributes.get(rememberMeAttributeName);
boolean isRemembered = rememberMeStringValue != null && Boolean.parseBoolean(rememberMeStringValue);
if (isRemembered) {
casToken.setRememberMe(true);
}
// create simple authentication info
List<Object> principals = CollectionUtils.asList(userId, attributes);
PrincipalCollection principalCollection = new SimplePrincipalCollection(principals, getName());
return new SimpleAuthenticationInfo(principalCollection, ticket);
} catch (TicketValidationException e) {
throw new CasAuthenticationException("Unable to validate ticket [" + ticket + "]", e);
}
}
/**
* Retrieves the AuthorizationInfo for the given principals (the CAS previously authenticated user : id + attributes).
*
* @param principals the primary identifying principals of the AuthorizationInfo that should be retrieved.
* @return the AuthorizationInfo associated with this principals.
*/
@Override
@SuppressWarnings("unchecked")
protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
// retrieve user information
SimplePrincipalCollection principalCollection = (SimplePrincipalCollection) principals;
List<Object> listPrincipals = principalCollection.asList();
Map<String, String> attributes = (Map<String, String>) listPrincipals.get(1);
// create simple authorization info
SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
// add default roles
addRoles(simpleAuthorizationInfo, split(defaultRoles));
// add default permissions
addPermissions(simpleAuthorizationInfo, split(defaultPermissions));
// get roles from attributes
List<String> attributeNames = split(roleAttributeNames);
for (String attributeName : attributeNames) {
String value = attributes.get(attributeName);
addRoles(simpleAuthorizationInfo, split(value));
}
// get permissions from attributes
attributeNames = split(permissionAttributeNames);
for (String attributeName : attributeNames) {
String value = attributes.get(attributeName);
addPermissions(simpleAuthorizationInfo, split(value));
}
return simpleAuthorizationInfo;
}
/**
* Split a string into a list of not empty and trimmed strings, delimiter is a comma.
*
* @param s the input string
* @return the list of not empty and trimmed strings
*/
private List<String> split(String s) {
List<String> list = new ArrayList<String>();
String[] elements = StringUtils.split(s, ',');
if (elements != null && elements.length > 0) {
for (String element : elements) {
if (StringUtils.hasText(element)) {
list.add(element.trim());
}
}
}
return list;
}
/**
* Add roles to the simple authorization info.
*
* @param simpleAuthorizationInfo
* @param roles the list of roles to add
*/
private void addRoles(SimpleAuthorizationInfo simpleAuthorizationInfo, List<String> roles) {
for (String role : roles) {
simpleAuthorizationInfo.addRole(role);
}
}
/**
* Add permissions to the simple authorization info.
*
* @param simpleAuthorizationInfo
* @param permissions the list of permissions to add
*/
private void addPermissions(SimpleAuthorizationInfo simpleAuthorizationInfo, List<String> permissions) {
for (String permission : permissions) {
simpleAuthorizationInfo.addStringPermission(permission);
}
}
public String getCasServerUrlPrefix() {
return casServerUrlPrefix;
}
public void setCasServerUrlPrefix(String casServerUrlPrefix) {
this.casServerUrlPrefix = casServerUrlPrefix;
}
public String getCasService() {
return casService;
}
public void setCasService(String casService) {
this.casService = casService;
}
public String getValidationProtocol() {
return validationProtocol;
}
public void setValidationProtocol(String validationProtocol) {
this.validationProtocol = validationProtocol;
}
public String getRememberMeAttributeName() {
return rememberMeAttributeName;
}
public void setRememberMeAttributeName(String rememberMeAttributeName) {
this.rememberMeAttributeName = rememberMeAttributeName;
}
public String getDefaultRoles() {
return defaultRoles;
}
public void setDefaultRoles(String defaultRoles) {
this.defaultRoles = defaultRoles;
}
public String getDefaultPermissions() {
return defaultPermissions;
}
public void setDefaultPermissions(String defaultPermissions) {
this.defaultPermissions = defaultPermissions;
}
public String getRoleAttributeNames() {
return roleAttributeNames;
}
public void setRoleAttributeNames(String roleAttributeNames) {
this.roleAttributeNames = roleAttributeNames;
}
public String getPermissionAttributeNames() {
return permissionAttributeNames;
}
public void setPermissionAttributeNames(String permissionAttributeNames) {
this.permissionAttributeNames = permissionAttributeNames;
}
}CasRealm和我们经常使用的UserRealm或JdbcRealm差异并不是很大,只是里边增加了casToken的验证,直接拿过来用再增加自己的逻辑就可以了,继承CasRealm类重载他的两个方法，具体代码如下：
package com.spring.mybatis.realm;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.cas.CasAuthenticationException;
import org.apache.shiro.cas.CasRealm;
import org.apache.shiro.cas.CasToken;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.SimplePrincipalCollection;
import org.apache.shiro.util.CollectionUtils;
import org.apache.shiro.util.StringUtils;
import org.jasig.cas.client.authentication.AttributePrincipal;
import org.jasig.cas.client.validation.Assertion;
import org.jasig.cas.client.validation.TicketValidationException;
import org.jasig.cas.client.validation.TicketValidator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 授权信息
* 来自 素文宅
* @author www.yoodb.com
*/
public class UserRealm extends CasRealm {
private final Logger log = LoggerFactory.getLogger(getClass());
@Override
protected AuthenticationInfo doGetAuthenticationInfo(
AuthenticationToken token) throws AuthenticationException {
CasToken casToken = (CasToken) token;
if (token == null) {
return null;
}
String ticket = (String) casToken.getCredentials();
if (!StringUtils.hasText(ticket)) {
return null;
}
TicketValidator ticketValidator = ensureTicketValidator();
try {
Assertion casAssertion = ticketValidator.validate(ticket,getCasService());
AttributePrincipal casPrincipal = casAssertion.getPrincipal();
String userId = casPrincipal.getName();
log.debug("Validate ticket : {} in CAS server : {} to retrieve user : {}",
new Object[] { ticket, getCasServerUrlPrefix(), userId });
Map<String, Object> attributes = casPrincipal.getAttributes();
casToken.setUserId(userId);
String rememberMeAttributeName = getRememberMeAttributeName();
String rememberMeStringValue = (String) attributes.get(rememberMeAttributeName);
boolean isRemembered = rememberMeStringValue != null
&& Boolean.parseBoolean(rememberMeStringValue);
if (isRemembered) {
casToken.setRememberMe(true);
}
List<Object> principals = CollectionUtils.asList(userId, attributes);
PrincipalCollection principalCollection = new SimplePrincipalCollection(principals, getName());
//可以获取到Cas登录账号信息，此步将对应权限体系信息放到缓存
return new SimpleAuthenticationInfo(principalCollection, ticket);
} catch (TicketValidationException e) {
throw new CasAuthenticationException("Unable to validate ticket [" + ticket + "]", e);
}
}
@Override
@SuppressWarnings("unchecked")
protected AuthorizationInfo doGetAuthorizationInfo(
PrincipalCollection principals) {
SimplePrincipalCollection principalCollection = (SimplePrincipalCollection) principals;
List<Object> listPrincipals = principalCollection.asList();
Map<String, String> attributes = (Map<String, String>) listPrincipals
.get(1);
SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
// 获取缓存信息放到认证实体中
addRoles(simpleAuthorizationInfo, split(getDefaultRoles()));
return simpleAuthorizationInfo;
}
private List<String> split(String s) {
List<String> list = new ArrayList<String>();
String[] elements = StringUtils.split(s, ',');
if (elements != null && elements.length > 0) {
for (String element : elements) {
if (StringUtils.hasText(element)) {
list.add(element.trim());
}
}
}
return list;
}
private void addRoles(SimpleAuthorizationInfo simpleAuthorizationInfo,List<String> roles) {
for (String role : roles) {
simpleAuthorizationInfo.addRole(role);
}
}
}获取CAS返回的用户信息，具体代码如下：
Subject subject = SecurityUtils.getSubject(); List list = subject.getPrincipals().asList(); String name = (String) list.get(0); Map<String, Object> info = (Map<String, Object>)list.get(1);
通过CAS3.5.2 Server登录后返回更多用户信息，参考资料：http://blog.yoodb.com/yoodb/article/detail/1223，List集合其中0元素是当前登录账号,1元素是一个map集合,存放的是cas Server返回的用户信息。
你留下邮箱，我发你一份也行。
阿星 (2019/09/17 15:04:36)回复
麻烦楼主分享一份代码。感谢感谢！
路人甲 (2019/09/28 07:07:39)回复
源码我现在没有了，其实我分享的代码就是源码差不多少。