TLS fingerprinting research + implementation

[thegodenage]

Context:

There is an method founded by the Salesforce engineers called "TLS fingerprinting" which can be used to found out the exact OS, browser, client data while making the TLS Handshake.

TODO:

• found out how TLS fingerprint works
• add implementation of it to the application

AC:

• there is a rich comment with the exact information, articles and other resources about TLS fingerprint
• there is an implementation of the whole thing
• there is high test coverage in the newly written code

Comment:

I have been doing some research about the subject and in order to make it real and fully functional we need to somehow rewrite the server, in order to have access to all the data send in the TLS Handshake. Currently we have access to the method in the TLS config struct, which gives us access to the thing, but there aren't all the needed data about request in order to make it functional.

There are also already made implementation of the TLS Fingerprinting for the server side and client side in golang.