Controlling network access based on application detection

1. A method performed by one or more data processing apparatus, the method comprising:

maintaining one or more application profiles, each application profile associated with one or more network activities in a network and corresponding to an application configured to execute on devices in the network;

detecting one or more network activities associated with a device connected to the network;

determining that an application corresponding to a first application profile is executing on the device based at least in part on the one or more detected network activities associated with the device substantially matching network activities associated with the first application profile; and

associating the device with a restricted network profile upon determining that the one or more detected network activities substantially match network activities associated with the first application profile, the restricted network profile configured to deny access by the device to one or more first resources on the network, and configured to allow access by the device to one or more second resources on the network.

2. The method of claim 1 , wherein the one or more network activities include communicating via a protocol, communicating to a first port, opening a second port, sending a first message, receiving a second message, or connecting to a certain destination address.

3. The method of claim 1 , wherein the one or more application profiles are each associated with a network application.

4. The method of claim 3 , wherein the network application is one of BitTorrent, UltraSurf, The Onion Router (TOR), a botnet client, a spambot client, or a virus.

5. The method of claim 1 , wherein detecting one or more network activities includes at least one of analyzing messages sent on the network, analyzing ports open on the network, analyzing connections made from the one or more devices, or analyzing connection made to the one or more devices.

6. The method of claim 1 , further comprising upon associating the device with the restricted network profile, providing a message to the device indicating the detected application profile.

7. The method of claim 1 , further comprising associating the device with an unrestricted network profile upon determining that the one or more network activities do not substantially match the first application profile.

8. The method of claim 1 , wherein the first application profile corresponds to a prohibited network application being used on the device.

9. The method of claim 1 , further comprising associating the device with an unrestricted network after passage of an amount of time associated with the first application profile.

10. The method of claim 1 , wherein the one or more first resources on the network and the one or more second resources on the network are determined based on a current undertaking associated with the device.

11. The method of claim 10 , wherein the current undertaking associated with the device is an educational class.

12. A system comprising:

a processor configured to execute computer program instructions; and

a computer storage medium encoded with computer program instructions that, when executed by the processor, cause the system to perform operations comprising:

maintaining one or more application profiles, each application profile associated with one or more network activities in a network and corresponding to an application configured to execute on devices in the network;

detecting one or more network activities associated with a device connected to the network;

determining that an application corresponding to a first application profile is executing on the device based at least in part on the one or more detected network activities associated with the device substantially matching network activities associated with the first application profile; and

associating the device with a restricted network profile upon determining that the one or more detected network activities substantially match network activities associated with the first application profile, the restricted network profile configured to deny access by the device to one or more first resources on the network, and configured to allow access by the device to one or more second resources on the network.

13. The system of claim 12 , wherein the one or more network activities include communicating via a protocol, communicating to a first port, opening a second port, sending a first message, receiving a second message, or connecting to a certain destination address.

14. The system of claim 12 , wherein the one or more application profiles are each associated with a network application.

15. The system of claim 14 , wherein the network application is one of BitTorrent, UltraSurf, The Onion Router (TOR), a botnet client, a spambot client, or a virus.

16. The system of claim 12 , wherein detecting one or more network activities includes at least one of analyzing messages sent on the network, analyzing ports open on the network, analyzing connections made from the one or more devices, or analyzing connection made to the one or more devices.

17. The system of claim 12 , the operations further comprising upon associating the device with the restricted network profile, providing a message to the device indicating the detected application profile.

18. The system of claim 12 , the operations further comprising associating the device with an unrestricted network profile upon determining that the one or more network activities do not substantially match the first application profile.

19. The system of claim 12 , wherein the first application profile corresponds to a prohibited network application being used on the device.

20. The system of claim 12 , wherein the one or more first resources on the network and the one or more second resources on the network are determined based on a current undertaking associated with the device.

21. The system of claim 20 , wherein the current undertaking associated with the device is an educational class.