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moby--moby/graph/manifest.go

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package graph
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
log "github.com/Sirupsen/logrus"
"github.com/docker/docker/engine"
"github.com/docker/docker/pkg/tarsum"
"github.com/docker/docker/registry"
"github.com/docker/docker/runconfig"
"github.com/docker/libtrust"
)
func (s *TagStore) newManifest(localName, remoteName, tag string) ([]byte, error) {
manifest := &registry.ManifestData{
Name: remoteName,
Tag: tag,
SchemaVersion: 1,
}
localRepo, err := s.Get(localName)
if err != nil {
return nil, err
}
if localRepo == nil {
return nil, fmt.Errorf("Repo does not exist: %s", localName)
}
// Get the top-most layer id which the tag points to
layerId, exists := localRepo[tag]
if !exists {
return nil, fmt.Errorf("Tag does not exist for %s: %s", localName, tag)
}
layersSeen := make(map[string]bool)
layer, err := s.graph.Get(layerId)
if err != nil {
return nil, err
}
manifest.Architecture = layer.Architecture
manifest.FSLayers = make([]*registry.FSLayer, 0, 4)
manifest.History = make([]*registry.ManifestHistory, 0, 4)
var metadata runconfig.Config
if layer.Config != nil {
metadata = *layer.Config
}
for ; layer != nil; layer, err = layer.GetParent() {
if err != nil {
return nil, err
}
if layersSeen[layer.ID] {
break
}
if layer.Config != nil && metadata.Image != layer.ID {
err = runconfig.Merge(&metadata, layer.Config)
if err != nil {
return nil, err
}
}
checksum, err := layer.GetCheckSum(s.graph.ImageRoot(layer.ID))
if err != nil {
return nil, fmt.Errorf("Error getting image checksum: %s", err)
}
if tarsum.VersionLabelForChecksum(checksum) != tarsum.Version1.String() {
archive, err := layer.TarLayer()
if err != nil {
return nil, err
}
defer archive.Close()
tarSum, err := tarsum.NewTarSum(archive, true, tarsum.Version1)
if err != nil {
return nil, err
}
if _, err := io.Copy(ioutil.Discard, tarSum); err != nil {
return nil, err
}
checksum = tarSum.Sum(nil)
// Save checksum value
if err := layer.SaveCheckSum(s.graph.ImageRoot(layer.ID), checksum); err != nil {
return nil, err
}
}
jsonData, err := layer.RawJson()
if err != nil {
return nil, fmt.Errorf("Cannot retrieve the path for {%s}: %s", layer.ID, err)
}
manifest.FSLayers = append(manifest.FSLayers, &registry.FSLayer{BlobSum: checksum})
layersSeen[layer.ID] = true
manifest.History = append(manifest.History, &registry.ManifestHistory{V1Compatibility: string(jsonData)})
}
manifestBytes, err := json.MarshalIndent(manifest, "", " ")
if err != nil {
return nil, err
}
return manifestBytes, nil
}
// loadManifest loads a manifest from a byte array and verifies its content.
// The signature must be verified or an error is returned. If the manifest
// contains no signatures by a trusted key for the name in the manifest, the
// image is not considered verified. The parsed manifest object and a boolean
// for whether the manifest is verified is returned.
func (s *TagStore) loadManifest(eng *engine.Engine, manifestBytes []byte) (*registry.ManifestData, bool, error) {
sig, err := libtrust.ParsePrettySignature(manifestBytes, "signatures")
if err != nil {
return nil, false, fmt.Errorf("error parsing payload: %s", err)
}
keys, err := sig.Verify()
if err != nil {
return nil, false, fmt.Errorf("error verifying payload: %s", err)
}
payload, err := sig.Payload()
if err != nil {
return nil, false, fmt.Errorf("error retrieving payload: %s", err)
}
var manifest registry.ManifestData
if err := json.Unmarshal(payload, &manifest); err != nil {
return nil, false, fmt.Errorf("error unmarshalling manifest: %s", err)
}
if manifest.SchemaVersion != 1 {
return nil, false, fmt.Errorf("unsupported schema version: %d", manifest.SchemaVersion)
}
var verified bool
for _, key := range keys {
job := eng.Job("trust_key_check")
b, err := key.MarshalJSON()
if err != nil {
return nil, false, fmt.Errorf("error marshalling public key: %s", err)
}
namespace := manifest.Name
if namespace[0] != '/' {
namespace = "/" + namespace
}
stdoutBuffer := bytes.NewBuffer(nil)
job.Args = append(job.Args, namespace)
job.Setenv("PublicKey", string(b))
// Check key has read/write permission (0x03)
job.SetenvInt("Permission", 0x03)
job.Stdout.Add(stdoutBuffer)
if err = job.Run(); err != nil {
return nil, false, fmt.Errorf("error running key check: %s", err)
}
result := engine.Tail(stdoutBuffer, 1)
log.Debugf("Key check result: %q", result)
if result == "verified" {
verified = true
}
}
return &manifest, verified, nil
}
func checkValidManifest(manifest *registry.ManifestData) error {
if len(manifest.FSLayers) != len(manifest.History) {
return fmt.Errorf("length of history not equal to number of layers")
}
if len(manifest.FSLayers) == 0 {
return fmt.Errorf("no FSLayers in manifest")
}
return nil
}