Intercepting encrypted network traffic for internet usage monitoring

1. A method to monitor network traffic for a computing device, the method comprising:

intercepting, with a meter executing on the computing device, a request sent by a client application executing on the computing device to establish a secure communication session with a network server, the meter including a kernel extension executing in an operating system kernel of the computing device;

receiving, at the meter in response to forwarding the request to the network server, a first public key provided by the network server for encrypting a session key to be used to exchange network traffic via the secure communication session;

providing, from the meter to the client application, a second public key associated with the meter instead of the first public key provided by the network server in response to the request being intercepted by the meter;

using the first public key and a private key associated with the second public key to exchange, via the meter, the session key between the client application and the network server to enable the meter to access an unencrypted version of the session key; and

monitoring, with the meter, the network traffic exchanged between the client application and the network server via the secure communication session using the unencrypted version of the session key.

2. The method as defined in claim 1 , wherein using the first public key and the private key associated with the second public key to exchange the session key between the client application and the network server includes:

intercepting, with the meter, a first encrypted version of the session key sent by the client application for receipt by the network server, the first encrypted version of the session key being encrypted using the second public key; and

decrypting, with the meter, the first encrypted version of the session key using the private key associated with the second public key to obtain the unencrypted version of the session key.

3. The method as defined in claim 2 , further including:

encrypting, at the meter, the unencrypted version of the session key using the first public key to determine a second encrypted version of the session key; and

sending the second encrypted version of the session key to the network server.

4. The method as defined in claim 1 , wherein monitoring the network traffic includes:

intercepting, at the meter, first encrypted network traffic sent from the client application to the network server;

decrypting the first encrypted network traffic using the unencrypted version of the session key to obtain first unencrypted network traffic; and

reporting the first unencrypted network traffic to a metering server.

5. The method as defined in claim 4 , further including:

intercepting, at the meter, second encrypted network traffic sent from the network server to the client application;

decrypting the second encrypted network traffic using the unencrypted version of the session key to obtain second unencrypted network traffic; and

reporting the second unencrypted network traffic to the metering server.

6. The method as defined in claim 1 , wherein the second public key is included in a digital certificate installed on the computing device prior to the request being sent by the client.

7. A tangible computer readable medium comprising computer readable instructions which, when executed, cause a processor of a computing device to at least:

execute a kernel extension of a meter in an operating system kernel of the computing device, the meter, when executed by the processor, to at least:

intercept a request sent by a client application executing on the computing device to establish a secure communication session with a network server;

receive, in response to forwarding the request to the network server, a first public key provided by the network server for encrypting a session key to be used to exchange network traffic via the secure communication session;

provide, to the client application, a second public key associated with a meter instead of the first public key provided by the network server in response to the request being intercepted;

use the first public key and a private key associated with the second public key to exchange the session key between the client application and the network server to enable the meter to access an unencrypted version of the session key; and

monitor the network traffic exchanged between the client application and the network server via the secure communication session using the unencrypted version of the session key.

8. The tangible computer readable medium as defined in claim 7 , wherein to use the first public key and the private key associated with the second public key to exchange the session key between the client application and the network server, the instructions, when executed, further cause the processor to execute the meter to:

intercept a first encrypted version of the session key sent by the client application for receipt by the network server, the first encrypted version of the session key being encrypted using the second public key; and

decrypt the first encrypted version of the session key using the private key associated with the second public key to obtain the unencrypted version of the session key.

9. The tangible computer readable medium as defined in claim 8 , wherein the instructions, when executed, further cause the processor to execute the meter to:

encrypt the unencrypted version of the session key using the first public key to determine a second encrypted version of the session key; and

send the second encrypted version of the session key to the network server.

10. The tangible computer readable medium as defined in claim 7 , wherein to monitor the network traffic, the instructions, when executed, cause the processor to execute the meter to:

intercept first encrypted network traffic sent from the client application to the network server;

decrypt the first encrypted network traffic using the unencrypted version of the session key to obtain first unencrypted network traffic; and

report the first unencrypted network traffic to a metering server.

11. The tangible computer readable medium as defined in claim 10 , wherein the instructions, when executed, further cause the processor to execute the meter to:

intercept second encrypted network traffic sent from the network server to the client application;

decrypt the second encrypted network traffic using the unencrypted version of the session key to obtain second unencrypted network traffic; and

report the second unencrypted network traffic to the metering server.

12. The tangible computer readable medium as defined in claim 7 , wherein the second public key is included in a digital certificate installed on the computing device prior to the request being sent by the client.

13. A computing device comprising:

a meter having a kernel extension to execute in an operating system kernel of the computing device, the meter including:

a content request interceptor to intercept a request sent by a client application executing on the computing device to establish a secure communication session with a network server;

a certificate manager to:

receive, in response to forwarding the request to the network server, a first public key provided by the network server for encrypting a session key to be used to exchange network traffic via the secure communication session;

provide, to the client application, a second public key associated with the meter instead of the first public key provided by the network server in response to the request being intercepted;

a session key interceptor to use the first public key and a private key associated with the second public key to exchange the session key between the client application and the network server to enable the meter to access an unencrypted version of the session key; and

a traffic interceptor to intercept the network traffic exchanged between the client application and the network server via the secure communication session using the unencrypted version of the session key.

14. The computing device as defined in claim 13 , wherein the session key interceptor is further to:

intercept a first encrypted version of the session key sent by the client application for receipt by the network server, the first encrypted version of the session key being encrypted using the second public key; and

decrypt the first encrypted version of the session key using the private key associated with the second public key to obtain the unencrypted version of the session key.

15. The computing device as defined in claim 14 , wherein the session key interceptor is further to:

encrypt the unencrypted version of the session key using the first public key to determine a second encrypted version of the session key; and

send the second encrypted version of the session key to the network server.

16. The computing device as defined in claim 13 , wherein the traffic interceptor is further to:

intercept first encrypted network traffic sent from the client application to the network server; and

decrypt the first encrypted network traffic using the unencrypted version of the session key to obtain first unencrypted network traffic.

17. The computing device as defined in claim 16 , wherein the traffic interceptor is further to:

intercept second encrypted network traffic sent from the network server to the client application; and

decrypt the second encrypted network traffic using the unencrypted version of the session key to obtain second unencrypted network traffic.

18. The computing device as defined in claim 17 , wherein the meter further includes a usage reporter to:

report the first unencrypted network traffic to a metering server; and

report the second unencrypted network traffic to the metering server.

19. The computing device as defined in claim 13 , wherein the second public key is included in a digital certificate installed on the computing device prior to the request being sent by the client.