深入浅析.NET应用程序SQL注入

USE MASTER 
GO
--检索SQLTMP数据库是否存在
IF EXISTS(SELECT * FROM SYSDATABASES WHERE name = 'SQLTMP')
--删除SQLTMP数据库
DROP DATABASE SQLTMP
GO
--创建数据库
CREATE DATABASE SQLTMP
GO
--使用SQLTMP数据库
USE SQLTMP
GO
-------------创建一张表用来验证SQL注入漏洞----------------
--检索表是否存在
IF EXISTS(SELECT * FROM SYSOBJECTS WHERE name = 'admin')
--删除表
DROP TABLE admin
GO
--创建表
CREATE TABLE admin
(
id INT PRIMARY KEY IDENTITY(1,1),--设置主键
name VARCHAR(20) NOT NULL,--用户名
pass VARCHAR(20) NOT NULL--密码
)
-------------插入一条测试数据---------------------------
INSERT INTO admin VALUES('admin','admin')
--查询插入数据
SELECT * FROM admin

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
namespace SQLTmp
{
class Program
{
//数据库连接字符串
public static String strCon = "Data Source=.;Initial Catalog=SQLTMP;Integrated Security=True";
//创建数据库连接对象
static SqlConnection SqlCon = new SqlConnection(strCon);
static void Main(string[] args)
{
Console.WriteLine("请输入用户名:");
String name = Console.ReadLine();
Console.WriteLine("请输入密码:");
String pass = Console.ReadLine();
try
{
Program p = new Program();
//打开数据库连接
p.Open();
string sql = "SELECT COUNT(*) FROM admin WHERE name = '"+name+"'AND pass = '"+pass+"'";
SqlCommand sqlcom = new SqlCommand(sql, SqlCon);
int i = (int)sqlcom.ExecuteScalar();
if (i > 0)
{
Console.WriteLine("登录成功！");
}
else
{
Console.WriteLine("登录失败!");
}
Console.ReadLine();
}
catch (Exception)
{
throw;
}
finally {
//关闭数据库连接
pass.Clone();
}
}
//打开数据库连接
public void Open()
{
//关闭状态下打开数据库连接
if (SqlCon.State == ConnectionState.Closed)
{
SqlCon.Open();
}
//中断情况下打开数据库连接
if (SqlCon.State == ConnectionState.Broken)
{
//关闭
SqlCon.Close();
SqlCon.Open();
}
}
//关闭数据库连接
public void Close() {
if (SqlCon.State == ConnectionState.Open || SqlCon.State == ConnectionState.Broken)
{
SqlCon.Close();
}
}
}
}

SELECT COUNT(*) FROM SQLTMP WHERE name = 'admin' AND pass = 'admin'
SELECT COUNT(*) FROM SQLTMP WHERE name = '' or 1=1 -- ' AND pass = '123'

 string sql = "SELECT COUNT(*) FROM admin WHERE name = '"+name+"'AND pass = '"+pass+"'";

SELECT COUNT(*) FROM SQLTMP WHERE name = '' or 1=1

string sql = "SELECT COUNT(*) FROM admin WHERE name = [url=home.php?mod=space&uid=116087]@name[/url] AND pass = @pass "; 
//创建SParameter[]
SqlParameter[] para = {
new SqlParameter("@name",name),
new SqlParameter("@pass",pass)
};
SqlCommand sqlcom = new SqlCommand(sql, SqlCon);
//通过Parameters.addRange方法将para[]放进去
sqlcom.Parameters.AddRange(para);
int i = (int)sqlcom.ExecuteScalar();

CREATE PROC Login (@name VARCHAR(20) ,@pass VARCHAR(20))
AS
SELECT COUNT(*) FROM admin WHERE name =@name AND pass = @pass
GO

SqlParameter[] para = {
new SqlParameter("@name",name),
new SqlParameter("@pass",pass)
};
SqlCommand sqlcom = new SqlCommand();
sqlcom.Connection = SqlCon;
sqlcom.CommandText = "Login";
//指定执行类型为存储过程
sqlcom.CommandType = CommandType.StoredProcedure;
sqlcom.Parameters.AddRange(para);
int i = (int)sqlcom.ExecuteScalar();