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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright [2010] [Anso Labs, LLC]
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Take uploaded bucket contents and register them as disk images (AMIs).
Requires decryption using keys in the manifest.
"""
# TODO(jesse): Got these from Euca2ools, will need to revisit them
import binascii
import glob
import json
import os
import shutil
import tarfile
import tempfile
from xml.etree import ElementTree
from nova import exception
from nova import flags
from nova import utils
from nova.objectstore import bucket
FLAGS = flags.FLAGS
flags.DEFINE_string('images_path', utils.abspath('../images'),
'path to decrypted images')
class Image(object):
def __init__(self, image_id):
self.image_id = image_id
self.path = os.path.abspath(os.path.join(FLAGS.images_path, image_id))
if not self.path.startswith(os.path.abspath(FLAGS.images_path)) or \
not os.path.isdir(self.path):
raise exception.NotFound
def delete(self):
for fn in ['info.json', 'image']:
try:
os.unlink(os.path.join(self.path, fn))
except:
pass
try:
os.rmdir(self.path)
except:
pass
def is_authorized(self, user):
try:
return self.metadata['isPublic'] or self.metadata['imageOwnerId'] == user.id
except:
return False
def set_public(self, state):
md = self.metadata
md['isPublic'] = state
with open(os.path.join(self.path, 'info.json'), 'w') as f:
json.dump(md, f)
@staticmethod
def all():
images = []
for fn in glob.glob("%s/*/info.json" % FLAGS.images_path):
try:
image_id = fn.split('/')[-2]
images.append(Image(image_id))
except:
pass
return images
@property
def owner_id(self):
return self.metadata['imageOwnerId']
@property
def metadata(self):
with open(os.path.join(self.path, 'info.json')) as f:
return json.load(f)
@staticmethod
def create(image_id, image_location, user):
image_path = os.path.join(FLAGS.images_path, image_id)
os.makedirs(image_path)
bucket_name = image_location.split("/")[0]
manifest_path = image_location[len(bucket_name)+1:]
bucket_object = bucket.Bucket(bucket_name)
manifest = ElementTree.fromstring(bucket_object[manifest_path].read())
image_type = 'machine'
try:
kernel_id = manifest.find("machine_configuration/kernel_id").text
if kernel_id == 'true':
image_type = 'kernel'
except:
pass
try:
ramdisk_id = manifest.find("machine_configuration/ramdisk_id").text
if ramdisk_id == 'true':
image_type = 'ramdisk'
except:
pass
info = {
'imageId': image_id,
'imageLocation': image_location,
'imageOwnerId': user.id,
'isPublic': False, # FIXME: grab public from manifest
'architecture': 'x86_64', # FIXME: grab architecture from manifest
'type' : image_type
}
def write_state(state):
info['imageState'] = state
with open(os.path.join(image_path, 'info.json'), "w") as f:
json.dump(info, f)
write_state('pending')
encrypted_filename = os.path.join(image_path, 'image.encrypted')
with open(encrypted_filename, 'w') as f:
for filename in manifest.find("image").getiterator("filename"):
shutil.copyfileobj(bucket_object[filename.text].file, f)
write_state('decrypting')
# FIXME: grab kernelId and ramdiskId from bundle manifest
encrypted_key = binascii.a2b_hex(manifest.find("image/ec2_encrypted_key").text)
encrypted_iv = binascii.a2b_hex(manifest.find("image/ec2_encrypted_iv").text)
cloud_private_key = os.path.join(FLAGS.ca_path, "private/cakey.pem")
decrypted_filename = os.path.join(image_path, 'image.tar.gz')
Image.decrypt_image(encrypted_filename, encrypted_key, encrypted_iv, cloud_private_key, decrypted_filename)
write_state('untarring')
image_file = Image.untarzip_image(image_path, decrypted_filename)
shutil.move(os.path.join(image_path, image_file), os.path.join(image_path, 'image'))
write_state('available')
os.unlink(decrypted_filename)
os.unlink(encrypted_filename)
@staticmethod
def decrypt_image(encrypted_filename, encrypted_key, encrypted_iv, cloud_private_key, decrypted_filename):
key, err = utils.execute('openssl rsautl -decrypt -inkey %s' % cloud_private_key, encrypted_key)
if err:
raise exception.Error("Failed to decrypt private key: %s" % err)
iv, err = utils.execute('openssl rsautl -decrypt -inkey %s' % cloud_private_key, encrypted_iv)
if err:
raise exception.Error("Failed to decrypt initialization vector: %s" % err)
out, err = utils.execute('openssl enc -d -aes-128-cbc -in %s -K %s -iv %s -out %s' % (encrypted_filename, key, iv, decrypted_filename))
if err:
raise exception.Error("Failed to decrypt image file %s : %s" % (encrypted_filename, err))
@staticmethod
def untarzip_image(path, filename):
tar_file = tarfile.open(filename, "r|gz")
tar_file.extractall(path)
image_file = tar_file.getnames()[0]
tar_file.close()
return image_file
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