【shiro】shiro学习笔记3-散列功能

对于密码，有很多种加密方式散列是其中 最常用的，shiro提供了直接支持。

环境

    <dependencies>
        <!-- shiro -->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-core</artifactId>
            <version>1.2.4</version>
        </dependency>

        <!--日志问题的解决-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.15</version>
        </dependency>

        <!--日志-->
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

目录结构

shiro封装的散列对象(列举常用)

Md5Hash

Md5Hash(Object source, Object salt, int hashIterations)

SimpleHash

SimpleHash(String algorithmName, Object source, Object salt, int hashIterations)

参数含意：
source: 要散列的值（这里是明文密码）
salt: 盐，用于与source一起散列的值，一般随机生成，用于防止暴力破解
hashIterations: 散列的次数
algorithmName: simpleHash是其它散列的父类（如下图），如果要用simpleHash就要告诉shiro使用哪种hash方式

代码

log4j.properties

log4j.rootLogger=DEBUG, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

shiro-realm-md5.ini

[main]
#注入凭证匹配器
cridentialMatcher = org.apache.shiro.authc.credential.HashedCredentialsMatcher
cridentialMatcher.hashAlgorithmName = MD5
cridentialMatcher.hashIterations = 3

#注入自定义的realm
hashRealm = xyz.mrwood.study.realm.HashRealm
hashRealm.credentialsMatcher = $cridentialMatcher
securityManager.realms = $hashRealm

User.java(模拟数据库中的表)

package xyz.mrwood.study.model;

/**
 * Created by Administrator on 2016/2/16.
 */
public class User {

    private String username;
    private String password;
    private String salt;

    public User(String username, String password, String salt) {
        this.username = username;
        this.password = password;
        this.salt = salt;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getSalt() {
        return salt;
    }

    public void setSalt(String salt) {
        this.salt = salt;
    }

    @Override
    public String toString() {
        return "User{" +
            "username='" + username + '\'' +
            ", password='" + password + '\'' +
            ", salt='" + salt + '\'' +
            '}';
    }
}

HashRealm.java

package xyz.mrwood.study.realm;

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.crypto.hash.Md5Hash;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import xyz.mrwood.study.model.User;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by Administrator on 2016/2/16.
 */
public class HashRealm extends AuthorizingRealm {

    //授权
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        return null;
    }

    //认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {

        //获得主体（帐号）
        String principal = (String) authenticationToken.getPrincipal();

        //模拟数据库
        Map<String, User> users = new HashMap<>();
        users.put("kiwi", new User("kiwi", new Md5Hash("22222", "324", 3).toString(), "324"));
        users.put("fly", new User("fly", new Md5Hash("111111", "123", 3).toString(), "123"));

        //验证帐号是否存在
        if (users.containsKey(principal)){

            User user = users.get(principal);

            System.out.printf(user.toString());
            //在realm中只要判断帐号是否存在，密码是否正确交给shiro比较
            return new SimpleAuthenticationInfo(principal, user.getPassword(), ByteSource.Util.bytes(user.getSalt()), getName());
        }else{

            return null;
        }
    }
}

AuthenticationTest.java

package xyz.mrwood.study.authentication;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.config.IniSecurityManagerFactory;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.util.Factory;
import org.junit.Test;

/**
 * Created by Administrator on 2016/2/12.
 */
public class AuthenticationTest {
    @Test
    public void testHash(){

//        构建SecurityManager对象
        Factory<SecurityManager> factory = new IniSecurityManagerFactory("classpath:shiro-realm-md5.ini");
        SecurityManager securityManager = factory.getInstance();

//        设置SecurityManager进入运行环境
        SecurityUtils.setSecurityManager(securityManager);

//        构建主体对象
        Subject subject = SecurityUtils.getSubject();

//        封装帐号密码对象
//        密码传明文，所有如果要用这个以后客户端不能再加密了
        AuthenticationToken token = new UsernamePasswordToken("kiwi", "22222");

//        提交验证
        try {
            subject.login(token);
        } catch (IncorrectCredentialsException e) {
            System.out.println("错误的凭证！");
        } catch (UnknownAccountException e){
            System.out.println("未知帐号！");
        }

        System.out.println("认证：" + subject.isAuthenticated());


    }
}

总结

1. 在realm中只要判断帐号是否存在，密码是否正确交给shiro比较
2. shiro的凭证匹配器的作用，就是得到明文密码与salt后怎么去散列，匹配器通过配置，有如下几种