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How Kazaa Works

How Kazaa Works. The inner workings of Kazaa and other Peer-2-Peer technologies By Troy Jessup. Terms of Use. Use of this presentation is granted to education and non-profit entities for education in security topics as described herein. The following limitations and restrictions apply:

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How Kazaa Works

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  1. How Kazaa Works The inner workings of Kazaa and other Peer-2-Peer technologiesBy Troy Jessup

  2. Terms of Use • Use of this presentation is granted to education and non-profit entities for education in security topics as described herein. The following limitations and restrictions apply: • The content of this presentation remain unchanged from its original published format, except for updates to the content for accuracy or current tactics/trends • Any changes made to the presentation are understood to not be the original work of the author, and noted in the presentation as such. • Credit to the author is retained as-is in the original presentation format. • Use by “for profit” or “commercial” entities must be granted permission by the author, and are subject to further restrictions.

  3. About the Author • Troy Jessup (CISSP) • Sr. Security Analyst for the Utah Education Network • Security Professional for 6 years • Author of Security related articles and information available free to the public at the URL listed below. • Updates to this and other presentations are available via the website: http://www.ndnn.org/blog

  4. The History • Kazaa Version 1 • Basic Design in Peer to Peer (P2P) • Followed in the footsteps of Napster • Static use of Port 1214/TCP for access

  5. The Present • Kazaa Version 2 • Basic Design in Peer to Peer (P2P) • Follows in the footsteps of Gnutella and Napster • Dynamic use of Port nearly ANY port for access • Block and Firewall Evasion Built in.

  6. How Kazaa v2 Works Kazaa Client on your Network Kazaa Client on a Remote Network This client Responds to the request and sends back the file The Client Initiates a Connection to the Hosting Client File List The Kazaa Network This Client Searches for a File which the other client has available This Client Registers itself on Port 1214/TCP with the Kazaa Network The Network Responds with a Client ID to connect to for the file This Client Sends a List of Shared Files to the Network Normal File Sharing Concept for Kazaa Version 2

  7. How Kazaa v2 Works – Blocked From the Outside Kazaa Client on your Network Kazaa Client on a Remote Network This client PUSHES the File to the other Client X The Client Initiates a Connection to the Hosting Client and is Blocked Firewall File List This Client Searches for a File which the other client has available This Client Registers itself on Port 1214/TCP with the Kazaa Network As part of the KeepAlive, The Network Sends a Msg to the Client This Client Sends a List of Shared Files to the Network This Client Tells the Network that the Host is Blocked The Network Responds with a Client ID to connect to for the file The Kazaa Network What Happens if we Try to Block Port 1214/TCP

  8. X How Kazaa v2 Works – Blocked From the Inside and Outside Kazaa Client on your Network Kazaa Client on a Remote Network This client PUSHES the File to the other Client X The Client Initiates a Connection to the Hosting Client and is Blocked Firewall File List This Client Searches for a File which the other client has available This Client Registers itself on Port 80/TCP with the Kazaa Network As part of the KeepAlive, The Network Sends a Msg to the Client This Client Sends a List of Shared Files to the Network This Client Tells the Network that the Host is Blocked The Network Responds with a Client ID to connect to for the file Tries to get out on Ports: The Kazaa Network 1214/TCP - BLOCKED 1215/TCP - BLOCKED 3536/TCP - BLOCKED MANY OTHERS/TCP – BLOCKED It will Try Hundreds of Ports Including: 80,53,1024,etc etc etc What Happens if we Try to Block Port 1214/TCP Outbound

  9. The Future • Kazaa Version 2 • Has Basic Block and Firewall Evasion • There are only a few options available for blocking Kazaa v2 • None of which are easy to implement • Most Cost Money • Kazaa v3 is expected to make it even harder to block P2P traffic • Kazaa is Expected to take up more bandwidth than Web Traffic in the coming years

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