This challenge was about establishing a connection to a hidden tor service which is rather picky in accepting connections. We were given the following description:
rendezvous Misc (250 pts) -------------- The Plague has a friend called Alice who has some secrets on a tor service (http://6c4dm56aer6xn2h2.onion/). We think if we can talk to her, we can learn some useful things about The Plague. Unfortunately she will only rendezvous with "chandler" when he brings a cookie with "beef" baked into it. Can you help us find her secret?
The first thing we did was of course trying to connect to the service.
Whether using a tor to web gateway as for example onion.to or a local tor instance, the result was the same: no connection could be established.
curl -v –socks5-hostname localhost:9050 http://6c4dm56aer6xn2h2.onion/ showed that curl didn’t even send the request, confirming that the problem is at the tor layer and not at the HTTP layer.
Thus getting a tor connection to the hidden service is actually part of the challenge.