82 lines
3.2 KiB
Python
82 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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import ssl
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import http.client
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import urllib.request, urllib.error, urllib.parse
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import hashlib
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import logging
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import base64
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from OpenSSL import crypto
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logger = logging.getLogger(__name__)
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def get_service_id(cert):
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# compute sha1 of public key and encode first half in base32
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key = crypto.load_certificate(crypto.FILETYPE_ASN1, cert).get_pubkey()
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public_key = crypto.dump_privatekey(crypto.FILETYPE_ASN1, key)[22:]
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service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower()
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return service_id
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class InvalidCertificateException(http.client.HTTPException, urllib.error.URLError):
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def __init__(self, service_id, cert, reason):
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http.client.HTTPException.__init__(self)
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self._service_id = service_id
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self._cert_service_id = get_service_id(cert)
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self.reason = reason
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def __str__(self):
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return ('%s (local) != %s (remote) (%s)\n' %
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(self._service_id, self._cert_service_id, self.reason))
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class ServiceIdHTTPSConnection(http.client.HTTPSConnection):
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def __init__(self, host, port=None, service_id=None, check_hostname=None, context=None, **kwargs):
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self._service_id = service_id
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if self._service_id:
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check_hostname = False
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# dont fial for older verions of python
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# without ssl._create_default_https_context
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# that also don't check by default
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try:
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context = ssl._create_default_https_context()
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context.check_hostname = False
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context.verify_mode = ssl.CERT_NONE
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except:
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pass
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http.client.HTTPSConnection.__init__(self, host, port,
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check_hostname=check_hostname, context=context, **kwargs)
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def _check_service_id(self, cert):
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service_id = get_service_id(cert)
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logger.debug('ssl service_id: %s (match: %s)', service_id, service_id == self._service_id)
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if service_id != self._service_id:
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logger.debug('expected service_id: %s', self._service_id)
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return service_id == self._service_id
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def connect(self):
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http.client.HTTPSConnection.connect(self)
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if self._service_id:
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cert = self.sock.getpeercert(binary_form=True)
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if not self._check_service_id(cert):
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raise InvalidCertificateException(self._service_id, cert,
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'service_id mismatch')
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#logger.debug('CIPHER %s VERSION %s', self.sock.cipher(), self.sock.ssl_version)
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class ServiceIdHTTPSHandler(urllib.request.HTTPSHandler):
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def __init__(self, debuglevel=0, context=None, check_hostname=None, service_id=None):
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urllib.request.AbstractHTTPHandler.__init__(self, debuglevel)
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self._context = context
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self._check_hostname = check_hostname
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self._service_id = service_id
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def https_open(self, req):
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return self.do_open(ServiceIdHTTPSConnection, req,
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context=self._context, check_hostname=self._check_hostname,
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service_id=self._service_id)
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def get_opener(service_id):
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handler = ServiceIdHTTPSHandler(service_id=service_id)
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opener = urllib.request.build_opener(handler)
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return opener
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