How do i catch a SSL/TLS key using python sockets on server side

Question

The client makes a GET request on some websites, like https://www.youtube.com. This request is redirected to my proxy server, which gets all of the data. Then i try to decode('UTF-8') it, but i get error

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position 8: invalid start byte

I suppose this is because of SSL/TLS encryption? But then there is a question ---> How do I catch an SSL/TLS key using python sockets?

@AlexeyR. kind of, script is written in python, but the point is to "read as string" https request that client has sent to server. — BaronRandom, May 19 '21 at 12:15
I've written something along those lines using `asyncio`. You can check it out [here](https://github.com/synchronizing/mitm). — felipe, May 30 '21 at 22:17

score 1 · Accepted Answer · edited May 16 '21 at 12:06

1

This error is because there are non-ASCII characters and that can't be encoded or decoded. There is one way to avoid this is to use the encode() function. Let your string is x

x.encode('utf-8').strip()

edited May 16 '21 at 12:06

Anandesh Sharma

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answered May 16 '21 at 12:03

Vicks Loma

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I suppose this is an answer to error that i got, but still not clear on - how do i make this "non-ASCII" into a real request string that was sent from client? I need to catch SSL/TLS key to decrypt what i got ---- and so, here is the question, how do i catch ssl/tls keys to decrypt what client sends me? – BaronRandom May 16 '21 at 13:10
@BaronRandom You are better off wrapping the socket, and allowing the built-in Python functions to take care of SSL/TLS for you. See [here](https://docs.python.org/3/library/ssl.html#ssl.SSLContext.wrap_socket). – felipe May 30 '21 at 22:15

How do i catch a SSL/TLS key using python sockets on server side

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