asp.net利用HttpModule实现防sql注入

public class SqlHttpModule : IHttpModule
{
public void Dispose()
{
}
public void Init(HttpApplication context)
{
context.AcquireRequestState += new EventHandler(context_AcquireRequestState);
}
}

//url提交数据 get方式
if (context.Request.QueryString != null)
{
for (int i = 0; i < context.Request.QueryString.Count; i++)
{
key = context.Request.QueryString.Keys[i];
value = context.Server.UrlDecode(context.Request.QueryString[key]);
if (!FilterSql(value))
{
throw new Exception("QueryString(GET) including dangerous sql key word!");
}
}
}

//表单提交数据 post方式
if (context.Request.Form != null)
{
for (int i = 0; i < context.Request.Form.Count; i++)
{
key = context.Request.Form.Keys[i];
if (key == "__VIEWSTATE") continue;
value = context.Server.HtmlDecode(context.Request.Form[i]);
if (!FilterSql(value))
{
throw new Exception("Request.Form(POST) including dangerous sql key word!");
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
namespace DotNet.Common.WebForm
{
/// <summary>
/// 简单防止sql注入
/// </summary>
public class SqlHttpModule : IHttpModule
{
public void Dispose()
{
}
public void Init(HttpApplication context)
{
context.AcquireRequestState += new EventHandler(context_AcquireRequestState);
}
/// <summary>
/// 处理sql注入
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void context_AcquireRequestState(object sender, EventArgs e)
{
HttpContext context = ((HttpApplication)sender).Context;
try
{
string key = string.Empty;
string value = string.Empty;
//url提交数据 get方式
if (context.Request.QueryString != null)
{
for (int i = 0; i < context.Request.QueryString.Count; i++)
{
key = context.Request.QueryString.Keys[i];
value = context.Server.UrlDecode(context.Request.QueryString[key]);
if (!FilterSql(value))
{
throw new Exception("QueryString(GET) including dangerous sql key word!");
}
}
}
//表单提交数据 post方式
if (context.Request.Form != null)
{
for (int i = 0; i < context.Request.Form.Count; i++)
{
key = context.Request.Form.Keys[i];
if (key == "__VIEWSTATE") continue;
value = context.Server.HtmlDecode(context.Request.Form[i]);
if (!FilterSql(value))
{
throw new Exception("Request.Form(POST) including dangerous sql key word!");
}
}
}
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 过滤非法关键字，这个可以按照项目灵活配置
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
private bool FilterSql(string key)
{
bool flag = true;
try
{
if (!string.IsNullOrEmpty(key))
{
//一般配置在公共的文件中，如xml文件，txt文本等等
string sqlStr = "insert |delete |select |update |exec |varchar |drop |creat |declare |truncate |cursor |begin |open|<-- |--> ";
string[] sqlStrArr = sqlStr.Split('|');
foreach (string strChild in sqlStrArr)
{
if (key.ToUpper().IndexOf(strChild.ToUpper()) != -1)
{
flag = false;
break;
}
}
}
}
catch
{
flag = false;
}
return flag;
}
}
}

using System;
using System.Data;
using System.Configuration;
using System.Collections.Generic;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Reflection;
using System.Text;
using System.IO;
namespace DotNet.Common.WebForm
{
using DotNet.Common.Model;
using DotNet.Common.Util;
public class BasePage : System.Web.UI.Page
{
public BasePage()
{
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
AddHeaderJs();//向网页头部添加js等文件
}
#region 网页头添加通用统一js文件
private void AddHeaderJs()
{
string jsPath = "~/js/";
string filePath = Server.MapPath(jsPath);
Literal lit = new Literal();
StringBuilder sb = new StringBuilder();
if (!Directory.Exists(filePath))
throw new Exception("路径不存在");
List<string> listJs = new List<string>();
foreach (var item in Directory.GetFiles(filePath, "*.js", SearchOption.TopDirectoryOnly))
{
listJs.Add(Path.GetFileName(item));
}
foreach (var jsname in listJs)
{
sb.Append(ScriptInclude(jsPath + jsname));
}
lit.Text = sb.ToString();
Header.Controls.AddAt(1, lit);
}
private string ResolveHeaderUrl(string relativeUrl)
{
string url = null;
if (string.IsNullOrEmpty(relativeUrl))
{
url = string.Empty;
}
else if (!relativeUrl.StartsWith("~"))
{
url = relativeUrl;
}
else
{
var basePath = HttpContext.Current.Request.ApplicationPath;
url = basePath + relativeUrl.Substring(1);
url = url.Replace("//", "/");
}
return url;
}
private string ScriptInclude(string url)
{
if (string.IsNullOrEmpty(url))
throw new Exception("路径不存在");
string path = ResolveHeaderUrl(url);
return string.Format(@"<script src='{0}' type='text/javascript'></script>", path);
}
#endregion
}
}