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85 lines
3.4 KiB
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85 lines
3.4 KiB
HTML
There are two main reasons why you may want to exempt some traffic from mitmproxy's interception mechanism:
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- **Certificate pinning:** Some traffic is is protected using
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[certificate pinning](https://security.stackexchange.com/questions/29988/what-is-certificate-pinning) and mitmproxy's
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interception leads to errors. For example, Windows Update or the Apple App Store fail to work if mitmproxy is active.
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- **Convenience:** You really don't care about some parts of the traffic and just want them to go away.
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If you want to peek into (SSL-protected) non-HTTP connections, check out the [tcp proxy](@!urlTo("tcpproxy.html")!@) feature.
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If you want to ignore traffic from mitmproxy's processing because of large response bodies, take a look at the
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[response streaming](@!urlTo("responsestreaming.html")!@) feature.
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## How it works
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<table class="table">
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<tbody>
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<tr>
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<th width="20%">command-line</th> <td>--ignore regex</td>
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</tr>
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<tr>
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<th>mitmproxy shortcut</th> <td><b>I</b></td>
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</tr>
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</tbody>
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</table>
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mitmproxy allows you to specify a regex which is matched against a <code>host:port</code> string (e.g. "example.com:443")
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to determine hosts that should be excluded.
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There are two important quirks to consider:
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- **In transparent mode, the ignore pattern is matched against the IP.** While we usually infer the hostname from the
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Host header if the --host argument is passed to mitmproxy, we do not have access to this information before the SSL
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handshake.
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- In regular mode, explicit HTTP requests are never ignored.[^explicithttp] The ignore pattern is applied on CONNECT
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requests, which initiate HTTPS or clear-text WebSocket connections.
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### Tutorial
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If you just want to ignore one specific domain, there's usually a bulletproof method to do so:
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1. Run mitmproxy or mitmdump in verbose mode (-v) and observe the host:port information in the serverconnect
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messages. mitmproxy will filter on these.
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2. Take the host:port string, surround it with ^ and $, escape all dots (. becomes \\.)
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and use this as your ignore pattern:
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<pre class="terminal">
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$ mitmdump -v
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127.0.0.1:50588: clientconnect
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127.0.0.1:50588: request
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-> CONNECT example.com:443 HTTP/1.1
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127.0.0.1:50588: Set new server address: example.com:443
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<span style="color: white">127.0.0.1:50588: serverconnect
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-> example.com:443</span>
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^C
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$ <span style="color: white">mitmproxy --ignore ^example\.com:443$</span>
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</pre>
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Here are some other examples for ignore patterns:
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<pre>
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# Exempt traffic from the iOS App Store (the regex is lax, but usually just works):
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--ignore apple.com:443
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# "Correct" version without false-positives:
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--ignore "^(.+\.)?apple\.com:443$"
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# Ignore example.com, but not its subdomains:
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--ignore "^example.com:"
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# Ignore everything but example.com and mitmproxy.org:
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--ignore '^(?!example\.com)(?!mitmproxy\.org)'
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# Transparent mode:
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--ignore 17\.178\.96\.59:443
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# IP address range:
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--ignore 17\.178\.\d+\.\d+:443
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</pre>
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### See Also
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- [TCP Proxy](@!urlTo("tcpproxy.html")!@)
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- [Response Streaming](@!urlTo("responsestreaming.html")!@)
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[^explicithttp]: This stems from an limitation of explicit HTTP proxying: A single connection can be re-used for multiple target domains - a <code>GET http://example.com/</code> request may be followed by a <code>GET http://evil.com/</code> request on the same connection. If we start to ignore the connection after the first request, we would miss the relevant second one.
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