469 lines
18 KiB
Python
469 lines
18 KiB
Python
import hashlib
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import json
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import logging
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from flask import redirect, Blueprint, abort, send_file, make_response, request
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import features
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from app import app, signer, storage, metric_queue, config_provider, ip_resolver, instance_keys
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from auth.auth_context import get_authenticated_user
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from auth.decorators import process_auth
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from auth.permissions import ReadRepositoryPermission
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from data import database
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from data import model
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from data.registry_model import registry_model
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from endpoints.decorators import anon_protect, anon_allowed, route_show_if, parse_repository_name
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from endpoints.v2.blob import BLOB_DIGEST_ROUTE
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from image.appc import AppCImageFormatter
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from image.docker import ManifestException
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from image.docker.squashed import SquashedDockerImageFormatter
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from storage import Storage
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from util.audit import track_and_log, wrap_repository
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from util.http import exact_abort
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from util.registry.filelike import wrap_with_handler
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from util.registry.queuefile import QueueFile
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from util.registry.queueprocess import QueueProcess
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from util.registry.tarlayerformat import TarLayerFormatterReporter
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from util.registry.torrent import (make_torrent, per_user_torrent_filename, public_torrent_filename,
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PieceHasher, TorrentConfiguration)
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logger = logging.getLogger(__name__)
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verbs = Blueprint('verbs', __name__)
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LAYER_MIMETYPE = 'binary/octet-stream'
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class VerbReporter(TarLayerFormatterReporter):
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def __init__(self, kind):
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self.kind = kind
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def report_pass(self, pass_count):
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metric_queue.verb_action_passes.Inc(labelvalues=[self.kind, pass_count])
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def _open_stream(formatter, tag, manifest, schema1_manifest, derived_image_id, handlers, reporter):
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"""
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This method generates a stream of data which will be replicated and read from the queue files.
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This method runs in a separate process.
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"""
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# For performance reasons, we load the full image list here, cache it, then disconnect from
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# the database.
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with database.UseThenDisconnect(app.config):
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layers = registry_model.list_manifest_layers(manifest, include_placements=True)
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def image_stream_getter(store, blob):
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def get_stream_for_storage():
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current_image_stream = store.stream_read_file(blob.placements, blob.storage_path)
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logger.debug('Returning blob %s: %s', blob.digest, blob.storage_path)
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return current_image_stream
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return get_stream_for_storage
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def tar_stream_getter_iterator():
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# Re-Initialize the storage engine because some may not respond well to forking (e.g. S3)
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store = Storage(app, metric_queue, config_provider=config_provider, ip_resolver=ip_resolver)
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# Note: We reverse because we have to start at the leaf layer and move upward,
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# as per the spec for the formatters.
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for layer in reversed(layers):
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yield image_stream_getter(store, layer.blob)
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stream = formatter.build_stream(tag, schema1_manifest, derived_image_id, layers,
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tar_stream_getter_iterator, reporter=reporter)
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for handler_fn in handlers:
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stream = wrap_with_handler(stream, handler_fn)
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return stream.read
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def _sign_derived_image(verb, derived_image, queue_file):
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""" Read from the queue file and sign the contents which are generated. This method runs in a
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separate process. """
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signature = None
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try:
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signature = signer.detached_sign(queue_file)
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except:
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logger.exception('Exception when signing %s deriving image %s', verb, derived_image)
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return
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# Setup the database (since this is a new process) and then disconnect immediately
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# once the operation completes.
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if not queue_file.raised_exception:
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with database.UseThenDisconnect(app.config):
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registry_model.set_derived_image_signature(derived_image, signer.name, signature)
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def _write_derived_image_to_storage(verb, derived_image, queue_file):
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""" Read from the generated stream and write it back to the storage engine. This method runs in a
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separate process.
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"""
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def handle_exception(ex):
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logger.debug('Exception when building %s derived image %s: %s', verb, derived_image, ex)
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with database.UseThenDisconnect(app.config):
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registry_model.delete_derived_image(derived_image)
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queue_file.add_exception_handler(handle_exception)
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# Re-Initialize the storage engine because some may not respond well to forking (e.g. S3)
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store = Storage(app, metric_queue, config_provider=config_provider, ip_resolver=ip_resolver)
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try:
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store.stream_write(derived_image.blob.placements, derived_image.blob.storage_path, queue_file)
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except IOError as ex:
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logger.debug('Exception when writing %s derived image %s: %s', verb, derived_image, ex)
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with database.UseThenDisconnect(app.config):
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registry_model.delete_derived_image(derived_image)
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queue_file.close()
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def _torrent_for_blob(blob, is_public):
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""" Returns a response containing the torrent file contents for the given blob. May abort
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with an error if the state is not valid (e.g. non-public, non-user request).
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"""
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# Make sure the storage has a size.
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if not blob.compressed_size:
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abort(404)
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# Lookup the torrent information for the storage.
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torrent_info = registry_model.get_torrent_info(blob)
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if torrent_info is None:
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abort(404)
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# Lookup the webseed path for the storage.
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webseed = storage.get_direct_download_url(blob.placements, blob.storage_path,
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expires_in=app.config['BITTORRENT_WEBSEED_LIFETIME'])
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if webseed is None:
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# We cannot support webseeds for storages that cannot provide direct downloads.
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exact_abort(501, 'Storage engine does not support seeding.')
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# Load the config for building torrents.
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torrent_config = TorrentConfiguration.from_app_config(instance_keys, app.config)
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# Build the filename for the torrent.
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if is_public:
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name = public_torrent_filename(blob.uuid)
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else:
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user = get_authenticated_user()
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if not user:
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abort(403)
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name = per_user_torrent_filename(torrent_config, user.uuid, blob.uuid)
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# Return the torrent file.
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torrent_file = make_torrent(torrent_config, name, webseed, blob.compressed_size,
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torrent_info.piece_length, torrent_info.pieces)
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headers = {
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'Content-Type': 'application/x-bittorrent',
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'Content-Disposition': 'attachment; filename={0}.torrent'.format(name)}
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return make_response(torrent_file, 200, headers)
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def _torrent_repo_verb(repository, tag, manifest, verb, **kwargs):
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""" Handles returning a torrent for the given verb on the given image and tag. """
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if not features.BITTORRENT:
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# Torrent feature is not enabled.
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abort(406)
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# Lookup an *existing* derived storage for the verb. If the verb's image storage doesn't exist,
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# we cannot create it here, so we 406.
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derived_image = registry_model.lookup_derived_image(manifest, verb,
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varying_metadata={'tag': tag.name},
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include_placements=True)
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if derived_image is None:
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abort(406)
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# Return the torrent.
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torrent = _torrent_for_blob(derived_image.blob, model.repository.is_repository_public(repository))
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# Log the action.
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track_and_log('repo_verb', wrap_repository(repository), tag=tag.name, verb=verb, torrent=True,
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**kwargs)
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return torrent
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def _verify_repo_verb(_, namespace, repo_name, tag_name, verb, checker=None):
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permission = ReadRepositoryPermission(namespace, repo_name)
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repo = model.repository.get_repository(namespace, repo_name)
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repo_is_public = repo is not None and model.repository.is_repository_public(repo)
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if not permission.can() and not repo_is_public:
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logger.debug('No permission to read repository %s/%s for user %s with verb %s', namespace,
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repo_name, get_authenticated_user(), verb)
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abort(403)
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if repo is not None and repo.kind.name != 'image':
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logger.debug('Repository %s/%s for user %s is not an image repo', namespace, repo_name,
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get_authenticated_user())
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abort(405)
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# Make sure the repo's namespace isn't disabled.
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if not registry_model.is_namespace_enabled(namespace):
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abort(400)
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# Lookup the requested tag.
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repo_ref = registry_model.lookup_repository(namespace, repo_name)
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tag = registry_model.get_repo_tag(repo_ref, tag_name)
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if tag is None:
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logger.debug('Tag %s does not exist in repository %s/%s for user %s', tag, namespace, repo_name,
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get_authenticated_user())
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abort(404)
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# Get its associated manifest.
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manifest = registry_model.get_manifest_for_tag(tag, backfill_if_necessary=True)
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if manifest is None:
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logger.debug('Could not get manifest on %s/%s:%s::%s', namespace, repo_name, tag.name, verb)
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abort(404)
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# Ensure the manifest is not a list.
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try:
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schema1_manifest = registry_model.get_schema1_parsed_manifest(manifest, namespace,
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repo_name, tag.name,
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storage)
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except ManifestException:
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logger.exception('Could not get manifest on %s/%s:%s::%s', namespace, repo_name, tag.name, verb)
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abort(400)
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if schema1_manifest is None:
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abort(404)
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# If there is a data checker, call it first.
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if checker is not None:
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if not checker(tag, schema1_manifest):
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logger.debug('Check mismatch on %s/%s:%s, verb %s', namespace, repo_name, tag.name, verb)
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abort(404)
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# Preload the tag's repository information, so it gets cached.
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assert tag.repository.namespace_name
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assert tag.repository.name
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return tag, manifest, schema1_manifest
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def _repo_verb_signature(namespace, repository, tag_name, verb, checker=None, **kwargs):
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# Verify that the tag exists and that we have access to it.
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tag, manifest, _ = _verify_repo_verb(storage, namespace, repository, tag_name, verb, checker)
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# Find the derived image storage for the verb.
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derived_image = registry_model.lookup_derived_image(manifest, verb,
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varying_metadata={'tag': tag.name})
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if derived_image is None or derived_image.blob.uploading:
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return make_response('', 202)
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# Check if we have a valid signer configured.
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if not signer.name:
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abort(404)
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# Lookup the signature for the verb.
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signature_value = registry_model.get_derived_image_signature(derived_image, signer.name)
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if signature_value is None:
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abort(404)
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# Return the signature.
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return make_response(signature_value)
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def _repo_verb(namespace, repository, tag_name, verb, formatter, sign=False, checker=None,
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**kwargs):
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# Verify that the image exists and that we have access to it.
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logger.debug('Verifying repo verb %s for repository %s/%s with user %s with mimetype %s',
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verb, namespace, repository, get_authenticated_user(), request.accept_mimetypes.best)
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tag, manifest, schema1_manifest = _verify_repo_verb(storage, namespace, repository,
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tag_name, verb, checker)
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# Load the repository for later.
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repo = model.repository.get_repository(namespace, repository)
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if repo is None:
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abort(404)
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# Check for torrent. If found, we return a torrent for the repo verb image (if the derived
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# image already exists).
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if request.accept_mimetypes.best == 'application/x-bittorrent':
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metric_queue.repository_pull.Inc(labelvalues=[namespace, repository, verb + '+torrent', True])
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return _torrent_repo_verb(repo, tag, manifest, verb, **kwargs)
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# Log the action.
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track_and_log('repo_verb', wrap_repository(repo), tag=tag.name, verb=verb, **kwargs)
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metric_queue.repository_pull.Inc(labelvalues=[namespace, repository, verb, True])
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# Lookup/create the derived image for the verb and repo image.
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derived_image = registry_model.lookup_or_create_derived_image(
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manifest, verb, storage.preferred_locations[0], varying_metadata={'tag': tag.name},
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include_placements=True)
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if not derived_image.blob.uploading:
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logger.debug('Derived %s image %s exists in storage', verb, derived_image)
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is_head_request = request.method == 'HEAD'
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download_url = storage.get_direct_download_url(derived_image.blob.placements,
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derived_image.blob.storage_path,
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head=is_head_request)
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if download_url:
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logger.debug('Redirecting to download URL for derived %s image %s', verb, derived_image)
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return redirect(download_url)
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# Close the database handle here for this process before we send the long download.
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database.close_db_filter(None)
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logger.debug('Sending cached derived %s image %s', verb, derived_image)
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return send_file(
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storage.stream_read_file(derived_image.blob.placements, derived_image.blob.storage_path),
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mimetype=LAYER_MIMETYPE)
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logger.debug('Building and returning derived %s image %s', verb, derived_image)
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# Close the database connection before any process forking occurs. This is important because
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# the Postgres driver does not react kindly to forking, so we need to make sure it is closed
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# so that each process will get its own unique connection.
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database.close_db_filter(None)
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def _cleanup():
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# Close any existing DB connection once the process has exited.
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database.close_db_filter(None)
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hasher = PieceHasher(app.config['BITTORRENT_PIECE_SIZE'])
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def _store_metadata_and_cleanup():
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with database.UseThenDisconnect(app.config):
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registry_model.set_torrent_info(derived_image.blob, app.config['BITTORRENT_PIECE_SIZE'],
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hasher.final_piece_hashes())
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registry_model.set_derived_image_size(derived_image, hasher.hashed_bytes)
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# Create a queue process to generate the data. The queue files will read from the process
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# and send the results to the client and storage.
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handlers = [hasher.update]
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reporter = VerbReporter(verb)
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args = (formatter, tag, manifest, schema1_manifest, derived_image.unique_id, handlers, reporter)
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queue_process = QueueProcess(
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_open_stream,
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8 * 1024,
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10 * 1024 * 1024, # 8K/10M chunk/max
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args,
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finished=_store_metadata_and_cleanup)
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client_queue_file = QueueFile(queue_process.create_queue(), 'client')
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storage_queue_file = QueueFile(queue_process.create_queue(), 'storage')
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# If signing is required, add a QueueFile for signing the image as we stream it out.
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signing_queue_file = None
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if sign and signer.name:
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signing_queue_file = QueueFile(queue_process.create_queue(), 'signing')
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# Start building.
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queue_process.run()
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# Start the storage saving.
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storage_args = (verb, derived_image, storage_queue_file)
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QueueProcess.run_process(_write_derived_image_to_storage, storage_args, finished=_cleanup)
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if sign and signer.name:
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signing_args = (verb, derived_image, signing_queue_file)
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QueueProcess.run_process(_sign_derived_image, signing_args, finished=_cleanup)
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# Close the database handle here for this process before we send the long download.
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database.close_db_filter(None)
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# Return the client's data.
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return send_file(client_queue_file, mimetype=LAYER_MIMETYPE)
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def os_arch_checker(os, arch):
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def checker(tag, manifest):
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try:
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image_json = json.loads(manifest.leaf_layer.raw_v1_metadata)
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except ValueError:
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logger.exception('Could not parse leaf layer JSON for manifest %s', manifest)
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return False
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except TypeError:
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logger.exception('Could not parse leaf layer JSON for manifest %s', manifest)
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return False
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# Verify the architecture and os.
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operating_system = image_json.get('os', 'linux')
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if operating_system != os:
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return False
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architecture = image_json.get('architecture', 'amd64')
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# Note: Some older Docker images have 'x86_64' rather than 'amd64'.
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# We allow the conversion here.
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if architecture == 'x86_64' and operating_system == 'linux':
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architecture = 'amd64'
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if architecture != arch:
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return False
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return True
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return checker
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@route_show_if(features.ACI_CONVERSION)
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@anon_protect
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@verbs.route('/aci/<server>/<namespace>/<repository>/<tag>/sig/<os>/<arch>/', methods=['GET'])
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@verbs.route('/aci/<server>/<namespace>/<repository>/<tag>/aci.asc/<os>/<arch>/', methods=['GET'])
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@process_auth
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def get_aci_signature(server, namespace, repository, tag, os, arch):
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return _repo_verb_signature(namespace, repository, tag, 'aci', checker=os_arch_checker(os, arch),
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os=os, arch=arch)
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@route_show_if(features.ACI_CONVERSION)
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@anon_protect
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@verbs.route('/aci/<server>/<namespace>/<repository>/<tag>/aci/<os>/<arch>/', methods=[
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'GET', 'HEAD'])
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@process_auth
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def get_aci_image(server, namespace, repository, tag, os, arch):
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return _repo_verb(namespace, repository, tag, 'aci',
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AppCImageFormatter(), sign=True, checker=os_arch_checker(os, arch), os=os,
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arch=arch)
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@anon_protect
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@verbs.route('/squash/<namespace>/<repository>/<tag>', methods=['GET'])
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@process_auth
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def get_squashed_tag(namespace, repository, tag):
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return _repo_verb(namespace, repository, tag, 'squash', SquashedDockerImageFormatter())
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@route_show_if(features.BITTORRENT)
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@anon_protect
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@verbs.route('/torrent{0}'.format(BLOB_DIGEST_ROUTE), methods=['GET'])
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@process_auth
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@parse_repository_name()
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def get_tag_torrent(namespace_name, repo_name, digest):
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repo = model.repository.get_repository(namespace_name, repo_name)
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repo_is_public = repo is not None and model.repository.is_repository_public(repo)
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permission = ReadRepositoryPermission(namespace_name, repo_name)
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if not permission.can() and not repo_is_public:
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abort(403)
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user = get_authenticated_user()
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if user is None and not repo_is_public:
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# We can not generate a private torrent cluster without a user uuid (e.g. token auth)
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abort(403)
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if repo is not None and repo.kind.name != 'image':
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abort(405)
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repo_ref = registry_model.lookup_repository(namespace_name, repo_name)
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if repo_ref is None:
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abort(404)
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blob = registry_model.get_repo_blob_by_digest(repo_ref, digest, include_placements=True)
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if blob is None:
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abort(404)
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metric_queue.repository_pull.Inc(labelvalues=[namespace_name, repo_name, 'torrent', True])
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return _torrent_for_blob(blob, repo_is_public)
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@verbs.route('/_internal_ping')
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@anon_allowed
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def internal_ping():
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return make_response('true', 200)
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