Get the Whitepaper called SSL and HTTP Exposed. It discusses how to perform an HTTPS stripping attack against the TOR network using sslstrip.py and iptables.
You can download it from the following link: https://packetstormsecurity.com/files/download/101931/httpsslexposed.pdf
Source: https://packetstormsecurity.com/files/101931/SSL-And-HTTP-Exposed.html