root / snf-cyclades-app / synnefo / api / util.py @ 6dafedf6
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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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import datetime |
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import ipaddr |
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from base64 import b64encode, b64decode |
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from datetime import timedelta, tzinfo |
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from functools import wraps |
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from hashlib import sha256 |
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from logging import getLogger |
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from random import choice |
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from string import digits, lowercase, uppercase |
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from time import time |
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from traceback import format_exc |
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from wsgiref.handlers import format_date_time |
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import dateutil.parser |
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from Crypto.Cipher import AES |
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from django.conf import settings |
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from django.http import HttpResponse |
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from django.template.loader import render_to_string |
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from django.utils import simplejson as json |
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from django.utils.cache import add_never_cache_headers |
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from django.db.models import Q |
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from snf_django.lib.api import faults |
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from synnefo.db.models import (Flavor, VirtualMachine, VirtualMachineMetadata, |
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Network, BackendNetwork, NetworkInterface, |
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BridgePoolTable, MacPrefixPoolTable, Backend) |
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from synnefo.db.pools import EmptyPool |
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from snf_django.lib.astakos import get_user |
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from synnefo.plankton.utils import image_backend |
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from synnefo.settings import MAX_CIDR_BLOCK |
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log = getLogger('synnefo.api')
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def random_password(): |
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"""Generates a random password
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We generate a windows compliant password: it must contain at least
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one charachter from each of the groups: upper case, lower case, digits.
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"""
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pool = lowercase + uppercase + digits |
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lowerset = set(lowercase)
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upperset = set(uppercase)
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digitset = set(digits)
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length = 10
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password = ''.join(choice(pool) for i in range(length - 2)) |
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# Make sure the password is compliant
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chars = set(password)
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if not chars & lowerset: |
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password += choice(lowercase) |
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if not chars & upperset: |
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password += choice(uppercase) |
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if not chars & digitset: |
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password += choice(digits) |
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# Pad if necessary to reach required length
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password += ''.join(choice(pool) for i in range(length - len(password))) |
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return password
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def zeropad(s): |
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"""Add zeros at the end of a string in order to make its length
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a multiple of 16."""
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npad = 16 - len(s) % 16 |
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return s + '\x00' * npad |
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def encrypt(plaintext): |
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# Make sure key is 32 bytes long
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key = sha256(settings.SECRET_KEY).digest() |
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aes = AES.new(key) |
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enc = aes.encrypt(zeropad(plaintext)) |
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return b64encode(enc)
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def get_vm(server_id, user_id, for_update=False, non_deleted=False, |
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non_suspended=False):
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"""Find a VirtualMachine instance based on ID and owner."""
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try:
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server_id = int(server_id)
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servers = VirtualMachine.objects |
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if for_update:
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servers = servers.select_for_update() |
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vm = servers.get(id=server_id, userid=user_id) |
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if non_deleted and vm.deleted: |
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raise faults.BadRequest("Server has been deleted.") |
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if non_suspended and vm.suspended: |
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raise faults.Forbidden("Administratively Suspended VM") |
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return vm
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except ValueError: |
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raise faults.BadRequest('Invalid server ID.') |
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except VirtualMachine.DoesNotExist:
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raise faults.ItemNotFound('Server not found.') |
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def get_vm_meta(vm, key): |
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"""Return a VirtualMachineMetadata instance or raise ItemNotFound."""
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try:
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return VirtualMachineMetadata.objects.get(meta_key=key, vm=vm)
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except VirtualMachineMetadata.DoesNotExist:
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raise faults.ItemNotFound('Metadata key not found.') |
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def get_image(image_id, user_id): |
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"""Return an Image instance or raise ItemNotFound."""
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with image_backend(user_id) as backend: |
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return backend.get_image(image_id)
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def get_image_dict(image_id, user_id): |
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image = {} |
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img = get_image(image_id, user_id) |
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properties = img.get('properties', {})
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image["id"] = img["id"] |
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image["name"] = img["name"] |
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image['backend_id'] = img['location'] |
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image['format'] = img['disk_format'] |
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image['metadata'] = dict((key.upper(), val) |
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for key, val in properties.items()) |
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image['checksum'] = img['checksum'] |
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return image
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def get_flavor(flavor_id, include_deleted=False): |
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"""Return a Flavor instance or raise ItemNotFound."""
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try:
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flavor_id = int(flavor_id)
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if include_deleted:
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return Flavor.objects.get(id=flavor_id)
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else:
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return Flavor.objects.get(id=flavor_id, deleted=include_deleted)
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except (ValueError, Flavor.DoesNotExist): |
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raise faults.ItemNotFound('Flavor not found.') |
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def get_flavor_provider(flavor): |
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"""Extract provider from disk template.
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Provider for `ext` disk_template is encoded in the disk template
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name, which is formed `ext_<provider_name>`. Provider is None
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for all other disk templates.
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"""
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disk_template = flavor.disk_template |
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provider = None
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if disk_template.startswith("ext"): |
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disk_template, provider = disk_template.split("_", 1) |
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return disk_template, provider
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def get_network(network_id, user_id, for_update=False): |
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"""Return a Network instance or raise ItemNotFound."""
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try:
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network_id = int(network_id)
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objects = Network.objects |
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if for_update:
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objects = objects.select_for_update() |
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return objects.get(Q(userid=user_id) | Q(public=True), id=network_id) |
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except (ValueError, Network.DoesNotExist): |
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raise faults.ItemNotFound('Network not found.') |
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def validate_network_params(subnet, gateway=None, subnet6=None, gateway6=None): |
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try:
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# Use strict option to not all subnets with host bits set
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network = ipaddr.IPv4Network(subnet, strict=True)
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except ValueError: |
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raise faults.BadRequest("Invalid network IPv4 subnet") |
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# Check that network size is allowed!
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if not validate_network_size(network.prefixlen): |
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raise faults.OverLimit(message="Unsupported network size", |
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details="Network mask must be in range (%s, 29]" %
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MAX_CIDR_BLOCK) |
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# Check that gateway belongs to network
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if gateway:
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try:
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gateway = ipaddr.IPv4Address(gateway) |
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except ValueError: |
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raise faults.BadRequest("Invalid network IPv4 gateway") |
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if not gateway in network: |
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raise faults.BadRequest("Invalid network IPv4 gateway") |
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if subnet6:
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try:
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# Use strict option to not all subnets with host bits set
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network6 = ipaddr.IPv6Network(subnet6, strict=True)
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except ValueError: |
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raise faults.BadRequest("Invalid network IPv6 subnet") |
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if gateway6:
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try:
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gateway6 = ipaddr.IPv6Address(gateway6) |
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except ValueError: |
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raise faults.BadRequest("Invalid network IPv6 gateway") |
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if not gateway6 in network6: |
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raise faults.BadRequest("Invalid network IPv6 gateway") |
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def validate_network_size(cidr_block): |
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"""Return True if network size is allowed."""
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return cidr_block <= 29 and cidr_block > MAX_CIDR_BLOCK |
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def allocate_public_address(backend): |
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"""Allocate a public IP for a vm."""
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for network in backend_public_networks(backend): |
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try:
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address = get_network_free_address(network) |
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return (network, address)
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except EmptyPool:
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pass
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return (None, None) |
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def get_public_ip(backend): |
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"""Reserve an IP from a public network.
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This method should run inside a transaction.
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"""
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# Guarantee exclusive access to backend, because accessing the IP pools of
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# the backend networks may result in a deadlock with backend allocator
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# which also checks that backend networks have a free IP.
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backend = Backend.objects.select_for_update().get(id=backend.id) |
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address = None
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if settings.PUBLIC_USE_POOL:
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(network, address) = allocate_public_address(backend) |
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else:
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for net in list(backend_public_networks(backend)): |
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pool = net.get_pool() |
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if not pool.empty(): |
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address = 'pool'
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network = net |
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break
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if address is None: |
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log.error("Public networks of backend %s are full", backend)
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raise faults.OverLimit("Can not allocate IP for new machine." |
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" Public networks are full.")
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return (network, address)
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def backend_public_networks(backend): |
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"""Return available public networks of the backend.
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Iterator for non-deleted public networks that are available
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to the specified backend.
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"""
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for network in Network.objects.filter(public=True, deleted=False, |
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drained=False):
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if BackendNetwork.objects.filter(network=network,
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backend=backend).exists(): |
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yield network
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def get_network_free_address(network): |
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"""Reserve an IP address from the IP Pool of the network.
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Raises EmptyPool
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"""
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pool = network.get_pool() |
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address = pool.get() |
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pool.save() |
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return address
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def get_nic(machine, network): |
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try:
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return NetworkInterface.objects.get(machine=machine, network=network)
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except NetworkInterface.DoesNotExist:
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raise faults.ItemNotFound('Server not connected to this network.') |
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def get_nic_from_index(vm, nic_index): |
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"""Returns the nic_index-th nic of a vm
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Error Response Codes: itemNotFound (404), badMediaType (415)
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"""
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matching_nics = vm.nics.filter(index=nic_index) |
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matching_nics_len = len(matching_nics)
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if matching_nics_len < 1: |
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raise faults.ItemNotFound('NIC not found on VM') |
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elif matching_nics_len > 1: |
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raise faults.BadMediaType('NIC index conflict on VM') |
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nic = matching_nics[0]
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return nic
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def render_metadata(request, metadata, use_values=False, status=200): |
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if request.serialization == 'xml': |
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data = render_to_string('metadata.xml', {'metadata': metadata}) |
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else:
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if use_values:
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d = {'metadata': {'values': metadata}} |
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else:
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d = {'metadata': metadata}
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data = json.dumps(d) |
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return HttpResponse(data, status=status)
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def render_meta(request, meta, status=200): |
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if request.serialization == 'xml': |
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data = render_to_string('meta.xml', dict(key=key, val=val)) |
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else:
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data = json.dumps(dict(meta=meta))
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return HttpResponse(data, status=status)
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def construct_nic_id(nic): |
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return "-".join(["nic", unicode(nic.machine.id), unicode(nic.index)]) |
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def verify_personality(personality): |
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"""Verify that a a list of personalities is well formed"""
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if len(personality) > settings.MAX_PERSONALITY: |
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raise faults.OverLimit("Maximum number of personalities" |
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" exceeded")
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for p in personality: |
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# Verify that personalities are well-formed
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try:
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assert isinstance(p, dict) |
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keys = set(p.keys())
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allowed = set(['contents', 'group', 'mode', 'owner', 'path']) |
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assert keys.issubset(allowed)
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contents = p['contents']
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if len(contents) > settings.MAX_PERSONALITY_SIZE: |
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# No need to decode if contents already exceed limit
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raise faults.OverLimit("Maximum size of personality exceeded") |
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if len(b64decode(contents)) > settings.MAX_PERSONALITY_SIZE: |
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raise faults.OverLimit("Maximum size of personality exceeded") |
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except AssertionError: |
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raise faults.BadRequest("Malformed personality in request") |
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def values_from_flavor(flavor): |
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"""Get Ganeti connectivity info from flavor type.
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If link or mac_prefix equals to "pool", then the resources
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are allocated from the corresponding Pools.
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"""
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try:
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flavor = Network.FLAVORS[flavor] |
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except KeyError: |
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raise faults.BadRequest("Unknown network flavor") |
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mode = flavor.get("mode")
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link = flavor.get("link")
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if link == "pool": |
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link = allocate_resource("bridge")
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mac_prefix = flavor.get("mac_prefix")
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if mac_prefix == "pool": |
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mac_prefix = allocate_resource("mac_prefix")
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tags = flavor.get("tags")
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return mode, link, mac_prefix, tags
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def allocate_resource(res_type): |
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table = get_pool_table(res_type) |
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pool = table.get_pool() |
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value = pool.get() |
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pool.save() |
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return value
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def release_resource(res_type, value): |
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table = get_pool_table(res_type) |
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pool = table.get_pool() |
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pool.put(value) |
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pool.save() |
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def get_pool_table(res_type): |
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if res_type == "bridge": |
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return BridgePoolTable
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elif res_type == "mac_prefix": |
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return MacPrefixPoolTable
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else:
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raise Exception("Unknown resource type") |
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def get_existing_users(): |
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"""
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Retrieve user ids stored in cyclades user agnostic models.
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"""
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# also check PublicKeys a user with no servers/networks exist
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from synnefo.ui.userdata.models import PublicKeyPair |
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from synnefo.db.models import VirtualMachine, Network |
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keypairusernames = PublicKeyPair.objects.filter().values_list('user',
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flat=True)
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serverusernames = VirtualMachine.objects.filter().values_list('userid',
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flat=True)
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networkusernames = Network.objects.filter().values_list('userid',
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flat=True)
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return set(list(keypairusernames) + list(serverusernames) + |
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list(networkusernames))
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