通过Global.asax过滤关键字
方法一:
protected void Application_BeginRequest(Object sender, EventArgs e)
{
//SQL防注入
string Sql_1 = "exec|insert+|select+|delete|update|count|chr|mid|master+|truncate|char|declare|drop+|drop+table|creat+|creat+table";
string Sql_2 = "exec+|insert+|delete+|update+|count(|count+|chr+|+mid(|+mid+|+master+|truncate+|char+|+char(|declare+|drop+|creat+|drop+table|creat+table";
string[] sql_c = Sql_1.Split('|');
string[] sql_c1 = Sql_2.Split('|');
if (Request.QueryString != null)
{
foreach (string sl in sql_c)
{
if (Request.QueryString.ToString().ToLower().IndexOf(sl.Trim()) >= 0)
{
Response.Write("警告!你的IP已经被记录!");//
Response.Write(sl);
Response.Write(Request.QueryString.ToString());
Response.End();
break;
}
}
}
if (Request.Form.Count > 0)
{
string s1 = Request.ServerVariables["SERVER_NAME"].Trim();//服务器名称
if (Request.ServerVariables["HTTP_REFERER"] != null)
{
string s2 = Request.ServerVariables["HTTP_REFERER"].Trim();//http接收的名称
string s3 = "";
if (s1.Length > (s2.Length - 7))
{
s3 = s2.Substring(7);
}
else
{
s3 = s2.Substring(7, s1.Length);
}
if (s3 != s1)
{
Response.Write("你的IP已被记录!警告!");//
Response.End();
}
}
}
}
方法二:(比较好用)
/// <summary>
/// 当有数据时交时,触发事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Application_BeginRequest(Object sender, EventArgs e)
{
//遍历Post参数,隐藏域除外
foreach (string i in this.Request.Form)
{
if (i == "__VIEWSTATE") continue;
this.goErr(this.Request.Form[i].ToString());
}
//遍历Get参数。
foreach (string i in this.Request.QueryString)
{
this.goErr(this.Request.QueryString[i].ToString());
}
}
/// <summary>
///SQL注入过滤
/// </summary>
/// <param name="InText">要过滤的字符串</param>
/// <returns>如果参数存在不安全字符,则返回true</returns>
public bool SqlFilter(string InText)
{
string word = "and|exec|insert|select|delete|update|chr|mid|master|or|truncate|char|declare|join|cmd|;|'|--";//这里加要过滤的SQL字符
if (InText == null)
return false;
foreach (string i in word.Split('|'))
{
if ((InText.ToLower().IndexOf(i + " ") > -1) || (InText.ToLower().IndexOf(" " + i) > -1))
{
return true;
}
}
return false;
}
/// <summary>
/// 校验参数是否存在SQL字符
/// </summary>
/// <param name="tm"></param>
private void goErr(string tm)
{
if (SqlFilter(tm))
{
Response.Write("<script>window.alert('参数存在不安全字符');"+"</"+"script>");
}
}