Proxy
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A proxy is a third computer that allows communication between two other computers by forwarding requests between them. There are three main types of proxies: forward proxies receive requests from an internal network and send them externally, open proxies forward requests between anywhere on the internet, and reverse proxies receive external requests and send them internally without external users knowing the internal network. Proxies provide security advantages like hiding internal clients, blocking dangerous content, and acting as a single point of access, control and logging.
Proxy
- 1. Proxy © 2014, Triad Square Infosec Pvt. Ltd.
- 2. What is Proxy ? Communication between two computers (shown in grey) connected through a third computer (shown in red) acting as a proxy. © 2014, Triad Square Infosec Pvt. Ltd.
- 3. Types of Proxy Forward proxy Open proxy Reverse proxy © 2014, Triad Square Infosec Pvt. Ltd.
- 4. Forward proxy A forward proxy taking requests from an internal network and forwarding them to the Internet. © 2014, Triad Square Infosec Pvt. Ltd.
- 5. Open proxy An open proxy forwarding requests from and to anywhere on the Internet. Reference: en.wikipedia.org © 2014, Triad Square Infosec Pvt. Ltd.
- 6. Reverse proxy A reverse proxy taking requests from the Internet and forwarding them to servers in an internal network. Those making requests connect to the proxy and may not be aware of the internal network. © 2014, Triad Square Infosec Pvt. Ltd.
- 7. Squid Web Proxy Server © 2014, Triad Square Infosec Pvt. Ltd.
- 8. Security Advantages Terminates the TCP connection before relaying to target host (in and out) Hide internal clients from external network Blocking of dangerous URLs Filter dangerous content Check consistency of retrieved content Single point of access, control and logging © 2014, Triad Square Infosec Pvt. Ltd.
- 9. TCP connection termination The incoming and outgoing TCP connections are terminated Prevents a hacker from hijacking a stale (old) connection on a service that is being proxied. Example . HTTP page request request packet’ request packet Proxy User response packet Connection remain open until the proxy closes it after receiving response packet and sending it back to user Server response packet’ Connection only remain open until server closes the connection after sending the response packet © 2014, Triad Square Infosec Pvt. Ltd.
- 10. Reference en.wikipedia.org Thank You © 2014, Triad Square Infosec Pvt. Ltd.