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125 lines
4.3 KiB
Python
125 lines
4.3 KiB
Python
# Copyright 2007,2011 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# This file is derived from
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# http://googleappengine.googlecode.com/svn-history/r136/trunk/python/google/appengine/tools/https_wrapper.py
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"""Extensions to allow HTTPS requests with SSL certificate validation."""
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import httplib
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import re
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import socket
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import ssl
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import boto
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class InvalidCertificateException(httplib.HTTPException):
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"""Raised when a certificate is provided with an invalid hostname."""
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def __init__(self, host, cert, reason):
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"""Constructor.
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Args:
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host: The hostname the connection was made to.
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cert: The SSL certificate (as a dictionary) the host returned.
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"""
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httplib.HTTPException.__init__(self)
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self.host = host
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self.cert = cert
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self.reason = reason
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def __str__(self):
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return ('Host %s returned an invalid certificate (%s): %s' %
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(self.host, self.reason, self.cert))
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def GetValidHostsForCert(cert):
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"""Returns a list of valid host globs for an SSL certificate.
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Args:
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cert: A dictionary representing an SSL certificate.
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Returns:
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list: A list of valid host globs.
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"""
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if 'subjectAltName' in cert:
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return [x[1] for x in cert['subjectAltName'] if x[0].lower() == 'dns']
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else:
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return [x[0][1] for x in cert['subject']
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if x[0][0].lower() == 'commonname']
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def ValidateCertificateHostname(cert, hostname):
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"""Validates that a given hostname is valid for an SSL certificate.
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Args:
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cert: A dictionary representing an SSL certificate.
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hostname: The hostname to test.
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Returns:
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bool: Whether or not the hostname is valid for this certificate.
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"""
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hosts = GetValidHostsForCert(cert)
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boto.log.debug(
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"validating server certificate: hostname=%s, certificate hosts=%s",
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hostname, hosts)
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for host in hosts:
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host_re = host.replace('.', '\.').replace('*', '[^.]*')
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if re.search('^%s$' % (host_re,), hostname, re.I):
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return True
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return False
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class CertValidatingHTTPSConnection(httplib.HTTPConnection):
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"""An HTTPConnection that connects over SSL and validates certificates."""
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default_port = httplib.HTTPS_PORT
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def __init__(self, host, port=default_port, key_file=None, cert_file=None,
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ca_certs=None, strict=None, **kwargs):
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"""Constructor.
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Args:
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host: The hostname. Can be in 'host:port' form.
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port: The port. Defaults to 443.
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key_file: A file containing the client's private key
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cert_file: A file containing the client's certificates
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ca_certs: A file contianing a set of concatenated certificate authority
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certs for validating the server against.
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strict: When true, causes BadStatusLine to be raised if the status line
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can't be parsed as a valid HTTP/1.0 or 1.1 status line.
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"""
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httplib.HTTPConnection.__init__(self, host, port, strict, **kwargs)
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self.key_file = key_file
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self.cert_file = cert_file
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self.ca_certs = ca_certs
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def connect(self):
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"Connect to a host on a given (SSL) port."
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect((self.host, self.port))
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boto.log.debug("wrapping ssl socket; CA certificate file=%s",
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self.ca_certs)
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self.sock = ssl.wrap_socket(sock, keyfile=self.key_file,
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certfile=self.cert_file,
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cert_reqs=ssl.CERT_REQUIRED,
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ca_certs=self.ca_certs)
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cert = self.sock.getpeercert()
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hostname = self.host.split(':', 0)[0]
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if not ValidateCertificateHostname(cert, hostname):
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raise InvalidCertificateException(hostname,
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cert,
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'remote hostname "%s" does not match '\
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'certificate' % hostname)
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