openmedialibrary/oml/ssl_request.py
2014-05-19 17:00:33 +02:00

71 lines
2.7 KiB
Python

import httplib
import socket
import urllib2
import ssl
import hashlib
import logging
logger = logging.getLogger('oml.ssl_request')
class InvalidCertificateException(httplib.HTTPException, urllib2.URLError):
def __init__(self, fingerprint, cert, reason):
httplib.HTTPException.__init__(self)
self.fingerprint = fingerprint
self.cert_fingerprint = hashlib.sha1(cert).hexdigest()
self.reason = reason
def __str__(self):
return ('%s (local) != %s (remote) (%s)\n' %
(self.fingerprint, self.cert_fingerprint, self.reason))
class CertValidatingHTTPSConnection(httplib.HTTPConnection):
default_port = httplib.HTTPS_PORT
def __init__(self, host, port=None, fingerprint=None, strict=None, **kwargs):
httplib.HTTPConnection.__init__(self, host, port, strict, **kwargs)
self.fingerprint = fingerprint
if self.fingerprint:
self.cert_reqs = ssl.CERT_REQUIRED
else:
self.cert_reqs = ssl.CERT_NONE
self.cert_reqs = ssl.CERT_NONE
def _ValidateCertificateFingerprint(self, cert):
fingerprint = hashlib.sha1(cert).hexdigest()
return fingerprint == self.fingerprint
def connect(self):
sock = socket.create_connection((self.host, self.port))
self.sock = ssl.wrap_socket(sock, cert_reqs=self.cert_reqs)
#if self.cert_reqs & ssl.CERT_REQUIRED:
if self.fingerprint:
cert = self.sock.getpeercert(binary_form=True)
if not self._ValidateCertificateFingerprint(cert):
raise InvalidCertificateException(self.fingerprint, cert,
'fingerprint mismatch')
#logger.debug('CIPHER %s VERSION %s', self.sock.cipher(), self.sock.ssl_version)
class VerifiedHTTPSHandler(urllib2.HTTPSHandler):
def __init__(self, **kwargs):
urllib2.AbstractHTTPHandler.__init__(self)
self._connection_args = kwargs
def https_open(self, req):
def http_class_wrapper(host, **kwargs):
full_kwargs = dict(self._connection_args)
full_kwargs.update(kwargs)
return CertValidatingHTTPSConnection(host, **full_kwargs)
try:
return self.do_open(http_class_wrapper, req)
except urllib2.URLError, e:
if type(e.reason) == ssl.SSLError and e.reason.args[0] == 1:
raise InvalidCertificateException(self.fingerprint, '',
e.reason.args[1])
raise
https_request = urllib2.HTTPSHandler.do_request_
def get_opener(fingerprint):
handler = VerifiedHTTPSHandler(fingerprint=fingerprint)
opener = urllib2.build_opener(handler)
return opener