java SQL注入分析程序

liu0107613

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java

SQL Java MySQL JDBC

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(10) unsigned NOT NULL auto_increment,
`name` varchar(45) NOT NULL,
`passwd` varchar(45) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=gb2312;

package com.liuxt;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class SqlInjection {
Connection conn=null;

private void initDB(){

  try{
   Class.forName("com.mysql.jdbc.Driver");
   conn = DriverManager.getConnection("jdbc:mysql://localhost/test?" +
                                      "user=root&password=G@111111");

  }catch(Exception e){
    e.printStackTrace();
  }


}

private boolean queryPreUser(String name, String passwd) {
  PreparedStatement statement=null;
  try {
   String sql=this.ceatePreSql(name,passwd);
   statement=this.conn.prepareStatement(sql);
   System.out.println("sql....."+sql);
   statement.setString(1,name);
   statement.setString(2,passwd);
   ResultSet res=statement.executeQuery();
   int count=0;
   while(res.next()){
    count=res.getInt(1);

   }

   if(count==1) return true;
   else return false;

  } catch (SQLException e) {
   e.printStackTrace();
  }
  finally{
   try {
    statement.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }

  }
  return false;
}

private String ceatePreSql(String name, String passwd) {
  StringBuilder sb=new StringBuilder();
  sb.append("select count(*) as cc from user ");
  sb.append("where name=? ");
  sb.append("and passwd=? ");
  return sb.toString();
}

private boolean queryUser(String name, String passwd) {
  Statement statement=null;
  try {
   statement=this.conn.createStatement();
   String sql=this.creatSql(name,passwd);
   System.out.println("sql ....."+sql);
   ResultSet res=statement.executeQuery(sql);
   int count=0;
   while(res.next()){
    count=res.getInt(1);

   }

   if(count==1) return true;
   else return false;

  } catch (SQLException e) {
   e.printStackTrace();
  }
  finally{
   try {
    statement.close();
   } catch (SQLException e) {
    e.printStackTrace();
   }

  }
  return false;
}

private String creatSql(String name, String passwd) {

  StringBuilder sb=new StringBuilder();
  sb.append("select count(*) as cc from user ");
  sb.append("where name='"+name+"' ");
  sb.append("and passwd='"+passwd+"'");
  //sb.toString();
  return sb.toString();
}

public static void main(String[] args) {

  SqlInjection dbTest=new SqlInjection();
  dbTest.initDB();
  boolean result;
  result=dbTest.queryUser("test","111");
  System.out.println("query result(in Statement) is ===="+result);
  result=dbTest.queryUser("", "' or 1=1 --'");
  System.out.println("query result(in Statement) is ===="+result);
  result=dbTest.queryUser("' or 1=1 --'", "x");
  System.out.println("query result(in Statement) is ===="+result);

  result=dbTest.queryPreUser("test","111");
  System.out.println("query result(in PreparedStatement) is ===="+result);
  result=dbTest.queryPreUser("", "' or 1=1 --'");
  System.out.println("query result(in PreparedStatement) is ===="+result);
  result=dbTest.queryPreUser("' or 1=1 --'", "x");
  System.out.println("query result(in PreparedStatement) is ===="+result);
}

}

运行结果：

sql .....select count(*) as cc from user where name='test' and passwd='111'
query result(in Statement) is ====true
sql .....select count(*) as cc from user where name='' and passwd='' or 1=1 --''
query result(in Statement) is ====true
sql .....select count(*) as cc from user where name='' or 1=1 --'' and passwd='x'
query result(in Statement) is ====false
sql.....select count(*) as cc from user where name=? and passwd=?
query result(in PreparedStatement) is ====true
sql.....select count(*) as cc from user where name=? and passwd=?
query result(in PreparedStatement) is ====false
sql.....select count(*) as cc from user where name=? and passwd=?
query result(in PreparedStatement) is ====false

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java虚拟机规范 3.5 运行期数据区 | java virtural machine data type

2009-06-09 22:11
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5 楼 liomao 2009-07-15

SQL注入无处不在
有数据输入查询数据库而不加以限制就很容易产生注入
我在C# 的界面程序也试过SQL注入成功

4 楼 fengzhongtian 2009-07-14

<div class="quote_title">liu0107613 写道</div>
<div class="quote_div">
DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int(10) unsigned NOT NULL auto_increment, `name` varchar(45) NOT NULL, `passwd` varchar(45) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=gb2312;
 
 
 
 
package com.liuxt;
import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement;
public class SqlInjection { Connection conn=null; private void initDB(){ try{ Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/test?" + "<a href="mailto:user=root&password=G@111111">user=root&password=G@111111</a>");
 }catch(Exception e){ e.printStackTrace(); } }
 private boolean queryPreUser(String name, String passwd) { PreparedStatement statement=null; try { String sql=this.ceatePreSql(name,passwd); statement=this.conn.prepareStatement(sql); System.out.println("sql....."+sql); statement.setString(1,name); statement.setString(2,passwd); ResultSet res=statement.executeQuery(); int count=0; while(res.next()){ count=res.getInt(1); } if(count==1) return true; else return false; } catch (SQLException e) { e.printStackTrace(); } finally{ try { statement.close(); } catch (SQLException e) { e.printStackTrace(); } } return false; } 
 private String ceatePreSql(String name, String passwd) { StringBuilder sb=new StringBuilder(); sb.append("select count(*) as cc from user "); sb.append("where name=? "); sb.append("and passwd=? "); return sb.toString(); }
 private boolean queryUser(String name, String passwd) { Statement statement=null; try { statement=this.conn.createStatement(); String sql=this.creatSql(name,passwd); System.out.println("sql ....."+sql); ResultSet res=statement.executeQuery(sql); int count=0; while(res.next()){ count=res.getInt(1); } if(count==1) return true; else return false; } catch (SQLException e) { e.printStackTrace(); } finally{ try { statement.close(); } catch (SQLException e) { e.printStackTrace(); } } return false; } private String creatSql(String name, String passwd) { StringBuilder sb=new StringBuilder(); sb.append("select count(*) as cc from user "); sb.append("where name='"+name+"' "); sb.append("and passwd='"+passwd+"'"); //sb.toString(); return sb.toString(); }
 public static void main(String[] args) { SqlInjection dbTest=new SqlInjection(); dbTest.initDB(); boolean result; result=dbTest.queryUser("test","111"); System.out.println("query result(in Statement) is ===="+result); result=dbTest.queryUser("", "' or 1=1 --'"); System.out.println("query result(in Statement) is ===="+result); result=dbTest.queryUser("' or 1=1 --'", "x"); System.out.println("query result(in Statement) is ===="+result); result=dbTest.queryPreUser("test","111"); System.out.println("query result(in PreparedStatement) is ===="+result); result=dbTest.queryPreUser("", "' or 1=1 --'"); System.out.println("query result(in PreparedStatement) is ===="+result); result=dbTest.queryPreUser("' or 1=1 --'", "x"); System.out.println("query result(in PreparedStatement) is ===="+result); }
}
 
运行结果：
 
sql .....select count(*) as cc from user where name='test' and passwd='111' query result(in Statement) is ====true sql .....select count(*) as cc from user where name='' and passwd='' or 1=1 --'' query result(in Statement) is ====true sql .....select count(*) as cc from user where name='' or 1=1 --'' and passwd='x' query result(in Statement) is ====false sql.....select count(*) as cc from user where name=? and passwd=? query result(in PreparedStatement) is ====true sql.....select count(*) as cc from user where name=? and passwd=? query result(in PreparedStatement) is ====false sql.....select count(*) as cc from user where name=? and passwd=? query result(in PreparedStatement) is ====false 
 
 
</div>

3 楼 guoxu1231 2009-06-11

哟漏点了我要报告管理员才行绝对不能让这么不河蟹的图片出现在JE上!

2 楼 iaimstar 2009-06-10

ls图片好不河蟹啊

1 楼 neusoft 2009-06-10

在每次查询后把记录数输出大家就全明白了

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