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Certificate validating HTTPSHandler class, VerifiedHTTPSHandler, for Python 2.7

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Certificate validating HTTPSHandler class, VerifiedHTTPSHandler, for Python 2.7

from httplib import HTTPSConnection
import urllib2
import socket
import ssl
class VerifiedHTTPSConnection(HTTPSConnection):
	'''
	Modified version of the httplib.HTTPSConnection class that forces server
	certificate validation
	'''
	def __init__(self, host, port=None, key_file=None, cert_file=None,
		strict=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT, source_address=None,
		ca_file=None):
			HTTPSConnection.__init__(self, host, port, key_file,
				cert_file, strict, timeout, source_address)
			self.ca_file = ca_file
	def connect(self):
		sock = socket.create_connection(
			(self.host, self.port),
			self.timeout, self.source_address
		)
		if self._tunnel_host:
			self.sock = sock
			self._tunnel()
		if (None != self.ca_file):
			# Wrap the socket using verification with the root certs, note the hardcoded path
			self.sock = ssl.wrap_socket(
				sock,
				self.key_file,
				self.cert_file,
				cert_reqs = ssl.CERT_REQUIRED, # NEW: Require certificate validation
				ca_certs = self.ca_file # NEW: Path to trusted CA file
			)
		else:
			self.sock = ssl.wrap_socket(sock, self.key_file, self.cert_file)
class VerifiedHTTPSHandler(urllib2.HTTPSHandler):
	'''
	Modified version of the urllib2.HTTPSHandler class that uses the
	VerifiedHTTPSConnection HTTPSConnection class
	'''
	def __init__(self, debuglevel=0, key_file=None, cert_file=None, ca_file=None):
		urllib2.HTTPSHandler.__init__(self, debuglevel)
		self.key_file = key_file
		self.cert_file = cert_file
		self.ca_file = ca_file
	def https_open(self, req):
		return self.do_open(self.get_connection, req)
	def get_connection(self, host, timeout = socket._GLOBAL_DEFAULT_TIMEOUT):
		return VerifiedHTTPSConnection(host, timeout = timeout, ca_file = self.ca_file)
def main():
	# ca_file needs to be a PEM-formatted listing of certificate roots
	# See http://curl.haxx.se/ca/cacert.pem for an example
	# Or https://raw.github.com/Caligatio/nss-root-converter/master/nss-coverter-py27.py
	opener = urllib2.build_opener(VerifiedHTTPSHandler(ca_file = 'cacert.pem'))
	urllib2.install_opener(opener)
	request = urllib2.Request('https://www.google.com')
	sock = urllib2.urlopen(request)
	data = sock.read()
	print(data)
if ('__main__' == __name__):
	main()


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