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9aae3213b9
SSL is an outdated protocol superseeded by TLS. Although the commonly used library is called OpenSSL, it is no reason to still use outdated language for attributes.
58 lines
1.9 KiB
Python
58 lines
1.9 KiB
Python
"""
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This script makes it possible to use mitmproxy in scenarios where IP spoofing
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has been used to redirect connections to mitmproxy. The way this works is that
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we rely on either the TLS Server Name Indication (SNI) or the Host header of the
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HTTP request. Of course, this is not foolproof - if an HTTPS connection comes
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without SNI, we don't know the actual target and cannot construct a certificate
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that looks valid. Similarly, if there's no Host header or a spoofed Host header,
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we're out of luck as well. Using transparent mode is the better option most of
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the time.
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Usage:
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mitmproxy
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-p 443
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-s dns_spoofing.py
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# Used as the target location if neither SNI nor host header are present.
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-R http://example.com/
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# To avoid auto rewriting of host header by the reverse proxy target.
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--keep-host-header
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mitmdump
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-p 80
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-R http://localhost:443/
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(Setting up a single proxy instance and using iptables to redirect to it
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works as well)
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"""
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import re
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# This regex extracts splits the host header into host and port.
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# Handles the edge case of IPv6 addresses containing colons.
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# https://bugzilla.mozilla.org/show_bug.cgi?id=45891
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parse_host_header = re.compile(r"^(?P<host>[^:]+|\[.+\])(?::(?P<port>\d+))?$")
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class Rerouter:
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def request(self, flow):
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if flow.client_conn.tls_established:
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flow.request.scheme = "https"
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sni = flow.client_conn.connection.get_servername()
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port = 443
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else:
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flow.request.scheme = "http"
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sni = None
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port = 80
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host_header = flow.request.host_header
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m = parse_host_header.match(host_header)
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if m:
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host_header = m.group("host").strip("[]")
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if m.group("port"):
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port = int(m.group("port"))
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flow.request.host_header = host_header
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flow.request.host = sni or host_header
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flow.request.port = port
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addons = [Rerouter()]
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