Asp.net安全相关注意的几个问题

悟静 2014-05-10

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Asp.net安全相关注意的几个问题

1. 禁止外部提交

if(Request.UrlReferrer != null && Request.UrlReferrer.Host == Request.ServerVariables["Server_Name"] )
{正常处理}
else
{是外部提交}

2. 防止URL注入

一.如果参数全为数字:
// 检查字符串是否全为数字

public static bool IsNum(string Str)

{
    bool blResult = true;
    if (Str == "")
        blResult = false;
    else
    {
        foreach (char Char in Str)
        {
            if (!Char.IsNumber(Char))
            {
                blResult = false;
                break;
            }
        }
        if (blResult)
            if (int.Parse(Str) == 0)
                blResult = false;
    }
    return blResult;

}

应用:
string Topicid = Request.QueryString["Topicid"];

if (!IsNum(Topicid))
    Server.Transfer("Error.aspx?ErrID=404");

二.如果参数为文本.

// Html转换

public static string htmlstr(string chr)

{
    if(chr==null)
        return "";
    chr=chr.Replace("<","<");
    chr=chr.Replace(">",">");
    chr=chr.Replace("\n","<br>");
    chr=chr.Replace("\"",""");
    chr=chr.Replace("'","'");
    chr=chr.Replace(" "," ");
    chr=chr.Replace("\r","");
    return(chr);

}
应用:string strClass = htmlstr(Request.QueryString["ClassName"]);