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24 lines
995 B
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.. _upstreamcerts:
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Upstream Certificates
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=====================
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When mitmproxy receives a connection destined for an SSL-protected service, it
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freezes the connection before reading its request data, and makes a connection
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to the upstream server to "sniff" the contents of its SSL certificate. The
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information gained - the **Common Name** and **Subject Alternative Names** - is
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then used to generate the interception certificate, which is sent to the client
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so the connection can continue.
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This rather intricate little dance lets us seamlessly generate correct
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certificates even if the client has specified only an IP address rather than the
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hostname. It also means that we don't need to sniff additional data to generate
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certs in transparent mode.
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Upstream cert sniffing is on by default, and can optionally be turned off.
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================== ======================
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command-line ``--no-upstream-cert``
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mitmproxy shortcut :kbd:`o` then :kbd:`U`
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================== ======================
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