def _handle_instance_id_request(self, req):
instance_id = req.headers.get('X-Instance-ID')
tenant_id = req.headers.get('X-Tenant-ID')
signature = req.headers.get('X-Instance-ID-Signature')
remote_address = req.headers.get('X-Forwarded-For')
# Ensure that only one header was passed
if instance_id is None:
msg = _('X-Instance-ID header is missing from request.')
elif signature is None:
msg = _('X-Instance-ID-Signature header is missing from request.')
elif tenant_id is None:
msg = _('X-Tenant-ID header is missing from request.')
elif not isinstance(instance_id, six.string_types):
msg = _('Multiple X-Instance-ID headers found within request.')
elif not isinstance(tenant_id, six.string_types):
msg = _('Multiple X-Tenant-ID headers found within request.')
else:
msg = None
if msg:
raise webob.exc.HTTPBadRequest(explanation=msg)
expected_signature = hmac.new(
CONF.neutron.metadata_proxy_shared_secret, instance_id,
hashlib.sha256).hexdigest()
if not utils.constant_time_compare(expected_signature, signature):
if instance_id:
LOG.warning(
_LW('X-Instance-ID-Signature: %(signature)s does '
'not match the expected value: '
'%(expected_signature)s for id: '
'%(instance_id)s. Request From: '
'%(remote_address)s'), {
'signature': signature,
'expected_signature': expected_signature,
'instance_id': instance_id,
'remote_address': remote_address
})
msg = _('Invalid proxy request signature.')
raise webob.exc.HTTPForbidden(explanation=msg)
try:
meta_data = self.get_metadata_by_instance_id(
instance_id, remote_address)
except Exception:
LOG.exception(_LE('Failed to get metadata for instance id: %s'),
instance_id)
msg = _('An unknown error has occurred. '
'Please try your request again.')
raise webob.exc.HTTPInternalServerError(
explanation=six.text_type(msg))
if meta_data is None:
LOG.error(_LE('Failed to get metadata for instance id: %s'),
instance_id)
elif meta_data.instance.project_id != tenant_id:
LOG.warning(
_LW("Tenant_id %(tenant_id)s does not match tenant_id "
"of instance %(instance_id)s."), {
'tenant_id': tenant_id,
'instance_id': instance_id
})
# causes a 404 to be raised
meta_data = None
return meta_data
def test_constant_time_compare(self):
self.assertTrue(utils.constant_time_compare("abcd1234", "abcd1234"))
self.assertFalse(utils.constant_time_compare("abcd1234", "a"))
self.assertFalse(utils.constant_time_compare("abcd1234", "ABCD234"))
def _handle_instance_id_request(self, req):
instance_id = req.headers.get('X-Instance-ID')
tenant_id = req.headers.get('X-Tenant-ID')
signature = req.headers.get('X-Instance-ID-Signature')
remote_address = req.headers.get('X-Forwarded-For')
# Ensure that only one header was passed
if instance_id is None:
msg = _('X-Instance-ID header is missing from request.')
elif signature is None:
msg = _('X-Instance-ID-Signature header is missing from request.')
elif tenant_id is None:
msg = _('X-Tenant-ID header is missing from request.')
elif not isinstance(instance_id, six.string_types):
msg = _('Multiple X-Instance-ID headers found within request.')
elif not isinstance(tenant_id, six.string_types):
msg = _('Multiple X-Tenant-ID headers found within request.')
else:
msg = None
if msg:
raise webob.exc.HTTPBadRequest(explanation=msg)
expected_signature = hmac.new(
CONF.neutron.metadata_proxy_shared_secret,
instance_id,
hashlib.sha256).hexdigest()
if not utils.constant_time_compare(expected_signature, signature):
if instance_id:
LOG.warning(_LW('X-Instance-ID-Signature: %(signature)s does '
'not match the expected value: '
'%(expected_signature)s for id: '
'%(instance_id)s. Request From: '
'%(remote_address)s'),
{'signature': signature,
'expected_signature': expected_signature,
'instance_id': instance_id,
'remote_address': remote_address})
msg = _('Invalid proxy request signature.')
raise webob.exc.HTTPForbidden(explanation=msg)
try:
meta_data = self.get_metadata_by_instance_id(instance_id,
remote_address)
except Exception:
LOG.exception(_LE('Failed to get metadata for instance id: %s'),
instance_id)
msg = _('An unknown error has occurred. '
'Please try your request again.')
raise webob.exc.HTTPInternalServerError(
explanation=six.text_type(msg))
if meta_data is None:
LOG.error(_LE('Failed to get metadata for instance id: %s'),
instance_id)
elif meta_data.instance.project_id != tenant_id:
LOG.warning(_LW("Tenant_id %(tenant_id)s does not match tenant_id "
"of instance %(instance_id)s."),
{'tenant_id': tenant_id, 'instance_id': instance_id})
# causes a 404 to be raised
meta_data = None
return meta_data
def test_constant_time_compare(self):
self.assertTrue(utils.constant_time_compare("abcd1234", "abcd1234"))
self.assertFalse(utils.constant_time_compare("abcd1234", "a"))
self.assertFalse(utils.constant_time_compare("abcd1234", "ABCD234"))
