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25 lines
1.1 KiB
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25 lines
1.1 KiB
ReStructuredText
.. _transparent:
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Transparent Proxying
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====================
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When a transparent proxy is used, traffic is redirected into a proxy at the
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network layer, without any client configuration being required. This makes
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transparent proxying ideal for those situations where you can't change client
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behaviour - proxy-oblivious Android applications being a common example.
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To set up transparent proxying, we need two new components. The first is a
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redirection mechanism that transparently reroutes a TCP connection destined for
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a server on the Internet to a listening proxy server. This usually takes the
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form of a firewall on the same host as the proxy server - iptables_ on Linux
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or pf_ on OSX. When the proxy receives a redirected connection, it sees a vanilla
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HTTP request, without a host specification. This is where the second new component
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comes in - a host module that allows us to query the redirector for the original
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destination of the TCP connection.
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At the moment, mitmproxy supports transparent proxying on OSX Lion and above,
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and all current flavors of Linux.
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.. _iptables: http://www.netfilter.org/
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.. _pf: https://en.wikipedia.org/wiki/PF_\(firewall\)
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