Variables stored in a Session object hold information about one single user, and are available to all pages in one application. Common information stored in session variables are name, id, and preferences. The server creates a new Session object for each new user, and destroys the Session object when the session expires. A session ends if a user has not requested or refreshed a page in the application for a specified period.
By default, this is 20 minutes. If you want to set a timeout interval that is shorter or longer than the default, use the Timeout property. We do not know if the user's last request was the final one or not. So we do not know how long we should keep the session "alive". Waiting too long for an idle session uses up resources on the server, but if the session is deleted too soon the user has to start all over again because the server has deleted all the information.
Finding the right timeout interval can be difficult! Thanks again. Yes, sessions can also be stored in DB or files. Usually its done when user shows no activity for some time but we don't want to sign-out or destroy her session. Sessions synchronizations is another issue, for example 10 servers are serving requests, the first request was served by Server 1, but then it got busy in other users, and the subsequent request from same user sent to Server 4.
Now the session data exist in Server 1, so intelligent techniques are used here to make sure sessions remain synchronized on all servers or same server handle the request. It latest web architectures, e. The details of these issue is out of scope of this post. Yes it is possible but you get a overhead when storing in DB, so its batter to do only for inactive users as very well explained by Asif. I have a simple form submission. It stores some fields in the database.
Post a Comment. Term 'Session' is used in different contexts in computer science e. I would discuss the sessions in context of web applications only.
There are following fundamental points related to sessions in web applicaitons: 1. What is a session in web application? Why we need a session? How session creation and identification work? Where session data is stored? How to Delete a session? Lets look at each part one-by-one: 1. What is a Session in Web Application? Web developer may need to store small data temporarily at server side, for each user who is interacting with the web application.
Such data is stored in a session, so session is a temporary storage at web server. For each user, there is unique session are at server. Get certified by completing a course today! If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. Exercise: Create a session variable named "favcolor". Report Error. Your message has been sent to W3Schools. W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning.
Of course, do not use localhost Use an IP address where the target system s can reach you, e. Depending on your setup, you may be running a virtual machine e. VMware, VirtualBox or similar from where you are doing the pentesting. Now the way how networking works in virtual machines is that by default it is configured as NAT Network Address Translation.
This means that the target systems which you are trying to exploit are not able to reach you back, because your VM is hidden behind NAT masquerade. The following picture illustrates:. Very similar situation is when you are testing from your local work or home network LAN and you are pentesting something over the Internet.
The remote target system simply cannot reach your machine, because you are hidden behind NAT. It should be noted that this problem only applies if you are using reverse payloads e. Binding type of payloads should be working fine even if you are behind NAT. In case of pentesting from a VM, configure your virtual networking as bridged. This will expose your VM directly onto the network. Your Kali VM should get automatically configured with the same or similar IP address as your host operating system in case your network-manager is running and there is DHCP server on your network.
Another solution could be setting up a port forwarder on the host system your pc and forwarding all incoming traffic on port e. Socat is a remarkably versatile networking utility and it is available on all major platforms including Linux, Windows and Mac OS. With this solution, you should be able to use your host IP address as the address in your reverse payloads LHOST and you should be receiving sessions.
This applies to the second scenario where we are pentesting something over the Internet from a home or a work LAN. There are cloud services out there which allow you to configure a port forward using a public IP addresses.
All of these cloud services offer a basic port forward for free after signup and you should be able to receive meterpreter or shell sessions using either of these solutions. Another common reason why there is no session created during an exploitation is that there is a firewall blocking the network traffic required for establishing the session. This firewall could be:. In corporate networks there can be many firewalls between our machine and the target system, blocking the traffic.
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