public class SqlInject:Page
{
//检测到注入后的处理方式: 0:仅警告；1：警告+记录；2：警告+自定义错误页面；3：警告+记录+自定义错误页面
private const int _type = 0;
private const string errRedirectPage = "/err.aspx";
//如果记录注入信息，那么请设置：errMDBpath：数据库路径
private const string errMDBpath = "/SqlInject.mdb";
//过滤特征字符
//过滤特征字符
private static string StrKeyWord = ConfigurationManager.AppSettings["SqlKeyWord"]; //@"select|insert|delete|from|count(|drop table|update|truncate|asc(|mid(|char(|xp_cmdshell|exec|master|net local group administrators|net user|or|and";
private static string StrRegex = ConfigurationManager.AppSettings["SqlRegex"]; //@";|/|(|)|[|]|{|}|%|@|*|‘|!"; // 原始过滤条件：【-|;|,|/|(|)|[|]|{|}|%|@|*|‘|!】
private HttpRequest request;
public SqlInject(System.Web.HttpRequest _request)
{
this.request = _request;
}
///<summary>
///检测SQL注入及记录、显示出错信息
///</summary>
public void CheckSqlInject()
{
bool isInject = false;
if (CheckRequestQuery() || CheckRequestForm())
{
isInject = true;
}
else
{
return;
}
switch (_type)
{
case 0:
ShowErr();
break;
case 1:
ShowErr();
SaveToMdb();
break;
case 2:
ShowErr();
string temp;
System.Web.HttpContext.Current.Response.Write("<script>setTimeout(\"" + "location.href=‘" + errRedirectPage + "‘" + "\",5000)</script>");
break;
case 3:
ShowErr();
SaveToMdb();
System.Web.HttpContext.Current.Response.Write("<script>setTimeout(\"" + "location.href=‘" + errRedirectPage + "‘" + "\",5000)</script>");
break;
default:
break;
}
System.Web.HttpContext.Current.Response.End();
}
private void SaveToMdb()
{
OleDbConnection conn = new OleDbConnection("Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + Server.MapPath(errMDBpath));
conn.Open();
OleDbCommand cmd = conn.CreateCommand();
cmd.CommandText = "insert into [Record] (sIP,sDate,sPath) values (‘" +
request.ServerVariables["REMOTE_ADDR"].ToString() + "‘,‘" +
DateTime.Now + "‘,‘" + request.ServerVariables["URL"].ToLower() + RelaceSingleQuotes(request.QueryString.ToString()) + "‘)";
int code = cmd.ExecuteNonQuery();
if (code == 1)
HttpContext.Current.Response.Write("<br>****以上信息已记录至日志数据库****");
else
HttpContext.Current.Response.Write("<br>日志数据库出错");
conn.Close();
}
private string RelaceSingleQuotes(string _url)
{
string URL = _url.Replace("‘", "单引号");
return URL;
}
private void ShowErr()
{
//string msg = @"<font color=red>请不要尝试未授权之入侵检测！</font>" + @"<br><br>";
//msg += @"操作IP：" + request.ServerVariables["REMOTE_ADDR"] + @"<br>";
//msg += @"操作时间：" + DateTime.Now + @"<br>";
//msg += @"页面：" + request.ServerVariables["URL"].ToLower() + request.QueryString.ToString() + @"<br>";
//msg += @"<a href=‘#‘ onclick=‘javascript:window.close()‘>关闭</a>";
//System.Web.HttpContext.Current.Response.Clear();
//System.Web.HttpContext.Current.Response.Write(msg);
HttpContext.Current.Response.Write("<script>alert(‘请不要尝试未授权之入侵检测！‘);javascript:history.go(-1);</script>");
}
///<summary>
/// 特征字符
///</summary>
public static string KeyWord
{
get
{
return StrKeyWord;
}
}
///<summary>
/// 特征符号
///</summary>
public static string RegexString
{
get
{
return StrRegex;
}
}
///<summary>
///检查字符串中是否包含Sql注入关键字
/// <param name="_key">被检查的字符串</param>
/// <returns>如果包含注入true;否则返回false</returns>
///</summary>
private static bool CheckKeyWord(string _key)
{
string[] pattenString = StrKeyWord.Split(‘|‘);
string[] pattenRegex = StrRegex.Split(‘|‘);
foreach (string sqlParam in pattenString)
{
if (_key.Contains(sqlParam + " ") || _key.Contains(" " + sqlParam))
{
return true;
}
}
foreach (string sqlParam in pattenRegex)
{
if (_key.Contains(sqlParam))
{
return true;
}
}
return false;
}
///<summary>
///检查URL中是否包含Sql注入
/// <param name="_request">当前HttpRequest对象</param>
/// <returns>如果包含注入true;否则返回false</returns>
///</summary>
public bool CheckRequestQuery()
{
if (request.QueryString.Count > 0)
{
foreach (string sqlParam in this.request.QueryString)
{
if (sqlParam == "__VIEWSTATE") continue;
if (sqlParam == "__EVENTVALIDATION") continue;
if (CheckKeyWord(request.QueryString[sqlParam].ToLower()))
{
return true;
}
}
}
return false;
}
///<summary>
///检查提交的表单中是否包含Sql注入
/// <param name="_request">当前HttpRequest对象</param>
/// <returns>如果包含注入true;否则返回false</returns>
///</summary>
public bool CheckRequestForm()
{
if (request.Form.Count > 0)
{
foreach (string sqlParam in this.request.Form)
{
if (sqlParam == "__VIEWSTATE") continue;
if (sqlParam == "__EVENTVALIDATION") continue;
if (CheckKeyWord(request.Form[sqlParam]))
{
return true;
}
}
}
return false;
}
}
}
在web编程中都有被sql注入的风险，要防止sql注入，最基本就是从编写代码的时候开始防护
在web.config中加入
<appSettings>
<add key="SqlKeyWord" value="select|insert|delete|from|count(|drop table|update|truncate|asc(|mid(|char(|xp_cmdshell|exec|master|net local group administrators|net user|or|and"/>
<add key="SqlRegex" value=";|(|)|[|]|{|}|%|@|*|‘|!"/>
</appSettings>
然后在Global文件中加入
void Application_BeginRequest(object sender, EventArgs e)
{
//防SQL注入代码
SqlInject myCheck = new SqlInject(this.Request);
myCheck.CheckSqlInject();
}
对于软件方面的防护，微软官方给了一个UrlScan的工具
安装完软件后要重启一下iis才能生效
转载自 http://netsecurity.51cto.com/art/201301/375797_1.htm
aspx 中防止sql注入
时间： 2024-07-31 09:19:25