public void Serialize(HelperNetwork network, string filename)
{
using (var writer = new StreamWriter(filename))
{
var serializer = new System.Xml.Serialization.XmlSerializer(network.GetType());
serializer.Serialize(writer, network);
}
}
/// <summary>
/// XSS Injection 공격에 사용되는 Single quotation, Dobule quotation 을 제거한 값을 리턴합니다.
/// </summary>
/// <returns></returns>
public static string WithoutInjectionCharacters(string plainString, out bool hasInjectionCharacters)
{
bool isIncludedCharacter = false;
string returnValue = plainString;
try
{
// String 정제
if (!string.IsNullOrEmpty(plainString))
{
//string[] invalidCharacters = { "\"", "'", "%22", "%27", "<", ">", "%3C", "%3E", "%253C", "%253E", ";", "%3B" };
string[] invalidCharacters = HelperCommon._INJECTION_CHARACTERS.Split(',');
foreach (string n in invalidCharacters)
{
string replaceCharacter = "";
if (returnValue.ToUpper().Contains(n))
{
isIncludedCharacter = true;
}
switch (n)
{
case "<":
case "%3C":
replaceCharacter = "<";
break;
case ">":
case "%3E":
replaceCharacter = ">";
break;
default:
break;
}
// 대/소문자 각각 치환
returnValue = returnValue.Replace(n, replaceCharacter);
returnValue = returnValue.Replace(n.ToLower(), replaceCharacter);
}
// Injection 문자가 있으면 로그
if (isIncludedCharacter)
{
string requestUrl = string.Empty;
string referrerUrl = string.Empty;
string clientIpAddr = string.Empty;
requestUrl = HttpContext.Current.Request.Url.AbsoluteUri;
clientIpAddr = HelperNetwork.GetClientIpAddress();
// ReferrerUrl 이 있을 경우 조회
try
{
if (HttpContext.Current.Request.UrlReferrer != null)
{
referrerUrl = HttpContext.Current.Request.UrlReferrer.AbsoluteUri;
}
else
{
referrerUrl = "Referrer URL not exist";
}
}
catch (Exception ex)
{
referrerUrl = "Failed Get Referrer URL (Exception)";
}
// Exception 상황이 아닌, Injection 의심 건을 기록하기 위함
string logMessage = string.Format(@"
< Secure Warning >
[DESC] : {0}
[URL] : {1}
[REFERRER URL] : {2}
[IP] : {3}"
, "Maybe XSS, SQL Injection", requestUrl, referrerUrl, clientIpAddr);
HelperCommon.RegisterLogForHelperSecurity(logMessage);
}
}
}
catch (Exception ex)
{
HelperCommon.RegisterLogForHelperSecurity(ex.ToString());
}
hasInjectionCharacters = isIncludedCharacter;
return(returnValue);
}