85 lines
2.4 KiB
Go
85 lines
2.4 KiB
Go
package graph
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import (
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"bytes"
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"encoding/json"
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"fmt"
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log "github.com/Sirupsen/logrus"
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"github.com/docker/docker/engine"
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"github.com/docker/docker/registry"
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"github.com/docker/libtrust"
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)
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// loadManifest loads a manifest from a byte array and verifies its content.
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// The signature must be verified or an error is returned. If the manifest
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// contains no signatures by a trusted key for the name in the manifest, the
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// image is not considered verified. The parsed manifest object and a boolean
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// for whether the manifest is verified is returned.
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func (s *TagStore) loadManifest(eng *engine.Engine, manifestBytes []byte) (*registry.ManifestData, bool, error) {
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sig, err := libtrust.ParsePrettySignature(manifestBytes, "signatures")
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if err != nil {
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return nil, false, fmt.Errorf("error parsing payload: %s", err)
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}
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keys, err := sig.Verify()
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if err != nil {
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return nil, false, fmt.Errorf("error verifying payload: %s", err)
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}
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payload, err := sig.Payload()
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if err != nil {
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return nil, false, fmt.Errorf("error retrieving payload: %s", err)
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}
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var manifest registry.ManifestData
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if err := json.Unmarshal(payload, &manifest); err != nil {
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return nil, false, fmt.Errorf("error unmarshalling manifest: %s", err)
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}
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if manifest.SchemaVersion != 1 {
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return nil, false, fmt.Errorf("unsupported schema version: %d", manifest.SchemaVersion)
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}
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var verified bool
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for _, key := range keys {
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job := eng.Job("trust_key_check")
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b, err := key.MarshalJSON()
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if err != nil {
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return nil, false, fmt.Errorf("error marshalling public key: %s", err)
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}
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namespace := manifest.Name
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if namespace[0] != '/' {
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namespace = "/" + namespace
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}
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stdoutBuffer := bytes.NewBuffer(nil)
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job.Args = append(job.Args, namespace)
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job.Setenv("PublicKey", string(b))
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// Check key has read/write permission (0x03)
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job.SetenvInt("Permission", 0x03)
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job.Stdout.Add(stdoutBuffer)
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if err = job.Run(); err != nil {
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return nil, false, fmt.Errorf("error running key check: %s", err)
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}
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result := engine.Tail(stdoutBuffer, 1)
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log.Debugf("Key check result: %q", result)
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if result == "verified" {
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verified = true
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}
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}
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return &manifest, verified, nil
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}
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func checkValidManifest(manifest *registry.ManifestData) error {
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if len(manifest.FSLayers) != len(manifest.History) {
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return fmt.Errorf("length of history not equal to number of layers")
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}
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if len(manifest.FSLayers) == 0 {
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return fmt.Errorf("no FSLayers in manifest")
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}
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return nil
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}
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