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spring_jdbc数据库配置项中用户名及密码密文处理类(防黑客入侵用)

 
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原始配置

spring结合mysql,一般是单独出配置文件jdbc.properties,

配置如下

driverClassName=com.mysql.jdbc.Driver
db.mysql.url=jdbc:mysql://127.0.0.1:3306/tq?autoReconnect=true&useUnicode=true&characterEncoding=utf8
db.mysql.username=test
db.mysql.password=123456

配置spring-jdbc.xml,使其加载该配置项。示例如下:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
		http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
		http://www.springframework.org/schema/context 
		http://www.springframework.org/schema/context/spring-context-3.0.xsd 
		http://www.springframework.org/schema/mvc 
		http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
		http://www.springframework.org/schema/tx 
		http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"
	default-autowire="byName">

	<context:annotation-config />
	<!-- 扫描组件,完成自动装配 -->
	<context:component-scan base-package="com.tq.app.epg.dao" />

	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:jdbc.properties</value>
			</list>
		</property>
	</bean>
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
		destroy-method="close" lazy-init="true" depends-on="propertyConfigurer">
		<property name="driverClass" value="${driverClassName}" />
		<property name="jdbcUrl" value="${db.mysql.url}" />
		<property name="user" value="${db.mysql.username}" />
		<property name="password" value="${db.mysql.password}" />
		<property name="autoCommitOnClose" value="true" />
		<property name="minPoolSize" value="5" />
		<property name="maxPoolSize" value="80" />
		<property name="maxIdleTime" value="1800" />
		<property name="maxStatements" value="100" />
		<property name="acquireIncrement" value="5" />
		<property name="idleConnectionTestPeriod" value="6000" />
		<property name="testConnectionOnCheckout" value="true" />
		<property name="checkoutTimeout" value="10000" />
	</bean>
	
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> 
        	<property name="dataSource" ref="dataSource" /> 
    	</bean>
    
</beans>

按上面进行配置,由于数据库连接、账号、密码是明文,存在泄露风险。可以在配置文件中存密文,在spring读取该配置文件时,进行解密。

改进配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
		http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
		http://www.springframework.org/schema/context 
		http://www.springframework.org/schema/context/spring-context-3.0.xsd 
		http://www.springframework.org/schema/mvc 
		http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
		http://www.springframework.org/schema/tx 
		http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"
	default-autowire="byName">

	<context:annotation-config />
	<!-- 扫描组件,完成自动装配 -->
	<context:component-scan base-package="com.tq.app.epg.dao" />

	<bean id="propertyConfigurer"
		class="com.tq.app.epg.utils.config.GvtvPropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:jdbc.properties</value>
			</list>
		</property>
	</bean>
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
		destroy-method="close" lazy-init="true" depends-on="propertyConfigurer">
		<property name="driverClass" value="${driverClassName}" />
		<property name="jdbcUrl" value="${db.mysql.url}" />
		<property name="user" value="${db.mysql.username}" />
		<property name="password" value="${db.mysql.password}" />
		<property name="autoCommitOnClose" value="true" />
		<property name="minPoolSize" value="5" />
		<property name="maxPoolSize" value="80" />
		<property name="maxIdleTime" value="1800" />
		<property name="maxStatements" value="100" />
		<property name="acquireIncrement" value="5" />
		<property name="idleConnectionTestPeriod" value="6000" />
		<property name="testConnectionOnCheckout" value="true" />
		<property name="checkoutTimeout" value="10000" />
	</bean>
	
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> 
        	<property name="dataSource" ref="dataSource" /> 
    	</bean>
</beans>

注意上面类GvtvPropertyPlaceholderConfigurer,该类的实现如下:

package com.tq.app.epg.utils.config;

import java.util.Enumeration;
import java.util.Properties;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

public class GvtvPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
    @Override
    protected void processProperties(ConfigurableListableBeanFactory beanFactoryToProcess, Properties props) throws BeansException {
        
        AESHelper aesHelper = new AESHelper();
        Enumeration<?> keys = props.propertyNames();
        while (keys.hasMoreElements()) {
            String key = (String)keys.nextElement();
            String value = props.getProperty(key);
            if (key.endsWith(".encryption") && null != value) {
                props.remove(key);
                key = key.substring(0, key.length() - 11);
                value = aesHelper.decrypt(value.trim());
                props.setProperty(key, value);
            }
            System.setProperty(key, value);
        }
        
        super.processProperties(beanFactoryToProcess, props);
    }
}

相应的jdbc.properties变为

driverClassName=com.mysql.jdbc.Driver
db.mysql.url.encryption=XXXXXXXXXXXXXXXXXXXXXXX
db.mysql.username.encryption=D12450E55E370A310C1AAAB5189BB42A
db.mysql.password.encryption=ADC6327D7DB1D55623B70B48614A331B

另附AESHelper类:

package com.tq.app.epg.utils.config;

import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * <一句话功能简述>
 */
public class AESHelper {
    Cipher ecipher;
    
    Cipher dcipher;
    
    /**
     * Input a string that will be md5 hashed to create the key.
     * 
     * @return void, cipher initialized
     */
    public AESHelper() {
        try {
            SecretKeySpec skey = new SecretKeySpec("9f265d42ab3c66d8f50a3a2e793a30c2".getBytes(), "AES");
            this.setupCrypto(skey);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public AESHelper(String key) {
        SecretKeySpec skey = new SecretKeySpec(getMD5(key), "AES");
        this.setupCrypto(skey);
    }
    
    private void setupCrypto(SecretKey key) {
        // Create an 8-byte initialization vector
        byte[] iv = new byte[]
        {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
        
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
        try {
            ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            
            // CBC requires an initialization vector
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    // Buffer used to transport the bytes from one stream to another
    // byte[] buf = new byte[1024];
    
    public void encrypt(InputStream in, OutputStream out) {
        byte[] buf = new byte[1024];
        try {
            // Bytes written to out will be encrypted
            out = new CipherOutputStream(out, ecipher);
            
            // Read in the cleartext bytes and write to out to encrypt
            int numRead = 0;
            while ((numRead = in.read(buf)) >= 0) {
                out.write(buf, 0, numRead);
            }
            out.close();
        }
        catch (java.io.IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * Input is a string to encrypt.
     * 
     * @return a Hex string of the byte array
     */
    public String encrypt(String plaintext) {
        try {
            byte[] ciphertext = ecipher.doFinal(plaintext.getBytes("UTF-8"));
            return byteToHex(ciphertext);
        }
        catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        
    }
    
    public void decrypt(InputStream in, OutputStream out) {
        try {
            byte[] buf = new byte[1024];
            // Bytes read from in will be decrypted
            in = new CipherInputStream(in, dcipher);
            
            // Read in the decrypted bytes and write the cleartext to out
            int numRead = 0;
            while ((numRead = in.read(buf)) >= 0) {
                out.write(buf, 0, numRead);
            }
            out.close();
        }
        catch (java.io.IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * Input encrypted String represented in HEX
     * 
     * @return a string decrypted in plain text
     */
    public String decrypt(String hexCipherText) {
        try {
            String plaintext = new String(dcipher.doFinal(hexToByte(hexCipherText)), "UTF-8");
            return plaintext;
        }
        catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    public String decrypt(byte[] ciphertext) {
        try {
            String plaintext = new String(dcipher.doFinal(ciphertext), "UTF-8");
            return plaintext;
        }
        catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    
    private static byte[] getMD5(String input) {
        try {
            byte[] bytesOfMessage = input.getBytes("UTF-8");
            MessageDigest md = MessageDigest.getInstance("MD5");
            return md.digest(bytesOfMessage);
        }
        catch (Exception e) {
            return null;
        }
    }
    
    static final String HEXES = "0123456789ABCDEF";
    
    public static String byteToHex(byte[] raw) {
        if (raw == null) {
            return null;
        }
        final StringBuilder hex = new StringBuilder(2 * raw.length);
        for (final byte b : raw) {
            hex.append(HEXES.charAt((b & 0xF0) >> 4)).append(HEXES.charAt((b & 0x0F)));
        }
        return hex.toString();
    }
    
    public static byte[] hexToByte(String hexString) {
        int len = hexString.length();
        byte[] ba = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            ba[i / 2] =
                (byte)((Character.digit(hexString.charAt(i), 16) << 4) + Character.digit(hexString.charAt(i + 1), 16));
        }
        return ba;
    }
    
}


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