application_acquirerequeststate event asp.net to prevent session hijacking
protected void Application_BeginRequest(object sender, EventArgs e)
{
//Check If it is a new session or not , if not then do the further checks
if (Request.Cookies["ASP.NET_SessionId"] != null && Request.Cookies["ASP.NET_SessionId"].Value != null)
{
string newSessionID = Request.Cookies["ASP.NET_SessionID"].Value;
//Check the valid length of your Generated Session ID
if (newSessionID.Length <= 24)
{
//Log the attack details here
Response.Cookies["TriedTohack"].Value = "True";
throw new HttpException("Invalid Request");
}
//Genrate Hash key for this User,Browser and machine and match with the Entered NewSessionID
if (GenerateHashKey() != newSessionID.Substring(24))
{
//Log the attack details here
Response.Cookies["TriedTohack"].Value = "True";
throw new HttpException("Invalid Request");
}
//Use the default one so application will work as usual//ASP.NET_SessionId
Request.Cookies["ASP.NET_SessionId"].Value = Request.Cookies["ASP.NET_SessionId"].Value.Substring(0, 24);
}
}