package image import ( "context" "encoding/hex" "encoding/json" "fmt" "io" "io/ioutil" "sort" "github.com/docker/cli/cli/command" "github.com/docker/cli/cli/streams" "github.com/docker/cli/cli/trust" "github.com/docker/distribution/reference" "github.com/docker/docker/api/types" registrytypes "github.com/docker/docker/api/types/registry" "github.com/docker/docker/pkg/jsonmessage" "github.com/docker/docker/registry" digest "github.com/opencontainers/go-digest" "github.com/pkg/errors" "github.com/sirupsen/logrus" "github.com/theupdateframework/notary/client" "github.com/theupdateframework/notary/tuf/data" ) type target struct { name string digest digest.Digest size int64 } // TrustedPush handles content trust pushing of an image func TrustedPush(ctx context.Context, cli command.Cli, repoInfo *registry.RepositoryInfo, ref reference.Named, authConfig types.AuthConfig, requestPrivilege types.RequestPrivilegeFunc) error { responseBody, err := imagePushPrivileged(ctx, cli, authConfig, ref, requestPrivilege) if err != nil { return err } defer responseBody.Close() return PushTrustedReference(cli, repoInfo, ref, authConfig, responseBody) } // PushTrustedReference pushes a canonical reference to the trust server. // nolint: gocyclo func PushTrustedReference(streams command.Streams, repoInfo *registry.RepositoryInfo, ref reference.Named, authConfig types.AuthConfig, in io.Reader) error { // If it is a trusted push we would like to find the target entry which match the // tag provided in the function and then do an AddTarget later. target := &client.Target{} // Count the times of calling for handleTarget, // if it is called more that once, that should be considered an error in a trusted push. cnt := 0 handleTarget := func(msg jsonmessage.JSONMessage) { cnt++ if cnt > 1 { // handleTarget should only be called once. This will be treated as an error. return } var pushResult types.PushResult err := json.Unmarshal(*msg.Aux, &pushResult) if err == nil && pushResult.Tag != "" { if dgst, err := digest.Parse(pushResult.Digest); err == nil { h, err := hex.DecodeString(dgst.Hex()) if err != nil { target = nil return } target.Name = pushResult.Tag target.Hashes = data.Hashes{string(dgst.Algorithm()): h} target.Length = int64(pushResult.Size) } } } var tag string switch x := ref.(type) { case reference.Canonical: return errors.New("cannot push a digest reference") case reference.NamedTagged: tag = x.Tag() default: // We want trust signatures to always take an explicit tag, // otherwise it will act as an untrusted push. if err := jsonmessage.DisplayJSONMessagesToStream(in, streams.Out(), nil); err != nil { return err } fmt.Fprintln(streams.Err(), "No tag specified, skipping trust metadata push") return nil } if err := jsonmessage.DisplayJSONMessagesToStream(in, streams.Out(), handleTarget); err != nil { return err } if cnt > 1 { return errors.Errorf("internal error: only one call to handleTarget expected") } if target == nil { return errors.Errorf("no targets found, please provide a specific tag in order to sign it") } fmt.Fprintln(streams.Out(), "Signing and pushing trust metadata") repo, err := trust.GetNotaryRepository(streams.In(), streams.Out(), command.UserAgent(), repoInfo, &authConfig, "push", "pull") if err != nil { return errors.Wrap(err, "error establishing connection to trust repository") } // get the latest repository metadata so we can figure out which roles to sign _, err = repo.ListTargets() switch err.(type) { case client.ErrRepoNotInitialized, client.ErrRepositoryNotExist: keys := repo.GetCryptoService().ListKeys(data.CanonicalRootRole) var rootKeyID string // always select the first root key if len(keys) > 0 { sort.Strings(keys) rootKeyID = keys[0] } else { rootPublicKey, err := repo.GetCryptoService().Create(data.CanonicalRootRole, "", data.ECDSAKey) if err != nil { return err } rootKeyID = rootPublicKey.ID() } // Initialize the notary repository with a remotely managed snapshot key if err := repo.Initialize([]string{rootKeyID}, data.CanonicalSnapshotRole); err != nil { return trust.NotaryError(repoInfo.Name.Name(), err) } fmt.Fprintf(streams.Out(), "Finished initializing %q\n", repoInfo.Name.Name()) err = repo.AddTarget(target, data.CanonicalTargetsRole) case nil: // already initialized and we have successfully downloaded the latest metadata err = AddTargetToAllSignableRoles(repo, target) default: return trust.NotaryError(repoInfo.Name.Name(), err) } if err == nil { err = repo.Publish() } if err != nil { err = errors.Wrapf(err, "failed to sign %s:%s", repoInfo.Name.Name(), tag) return trust.NotaryError(repoInfo.Name.Name(), err) } fmt.Fprintf(streams.Out(), "Successfully signed %s:%s\n", repoInfo.Name.Name(), tag) return nil } // AddTargetToAllSignableRoles attempts to add the image target to all the top level delegation roles we can // (based on whether we have the signing key and whether the role's path allows // us to). // If there are no delegation roles, we add to the targets role. func AddTargetToAllSignableRoles(repo client.Repository, target *client.Target) error { signableRoles, err := trust.GetSignableRoles(repo, target) if err != nil { return err } return repo.AddTarget(target, signableRoles...) } // imagePushPrivileged push the image func imagePushPrivileged(ctx context.Context, cli command.Cli, authConfig types.AuthConfig, ref reference.Reference, requestPrivilege types.RequestPrivilegeFunc) (io.ReadCloser, error) { encodedAuth, err := command.EncodeAuthToBase64(authConfig) if err != nil { return nil, err } options := types.ImagePushOptions{ RegistryAuth: encodedAuth, PrivilegeFunc: requestPrivilege, } return cli.Client().ImagePush(ctx, reference.FamiliarString(ref), options) } // trustedPull handles content trust pulling of an image func trustedPull(ctx context.Context, cli command.Cli, imgRefAndAuth trust.ImageRefAndAuth, opts PullOptions) error { refs, err := getTrustedPullTargets(cli, imgRefAndAuth) if err != nil { return err } ref := imgRefAndAuth.Reference() for i, r := range refs { displayTag := r.name if displayTag != "" { displayTag = ":" + displayTag } fmt.Fprintf(cli.Out(), "Pull (%d of %d): %s%s@%s\n", i+1, len(refs), reference.FamiliarName(ref), displayTag, r.digest) trustedRef, err := reference.WithDigest(reference.TrimNamed(ref), r.digest) if err != nil { return err } updatedImgRefAndAuth, err := trust.GetImageReferencesAndAuth(ctx, nil, AuthResolver(cli), trustedRef.String()) if err != nil { return err } if err := imagePullPrivileged(ctx, cli, updatedImgRefAndAuth, PullOptions{ all: false, platform: opts.platform, quiet: opts.quiet, remote: opts.remote, }); err != nil { return err } tagged, err := reference.WithTag(reference.TrimNamed(ref), r.name) if err != nil { return err } if err := TagTrusted(ctx, cli, trustedRef, tagged); err != nil { return err } } return nil } func getTrustedPullTargets(cli command.Cli, imgRefAndAuth trust.ImageRefAndAuth) ([]target, error) { notaryRepo, err := cli.NotaryClient(imgRefAndAuth, trust.ActionsPullOnly) if err != nil { return nil, errors.Wrap(err, "error establishing connection to trust repository") } ref := imgRefAndAuth.Reference() tagged, isTagged := ref.(reference.NamedTagged) if !isTagged { // List all targets targets, err := notaryRepo.ListTargets(trust.ReleasesRole, data.CanonicalTargetsRole) if err != nil { return nil, trust.NotaryError(ref.Name(), err) } var refs []target for _, tgt := range targets { t, err := convertTarget(tgt.Target) if err != nil { fmt.Fprintf(cli.Err(), "Skipping target for %q\n", reference.FamiliarName(ref)) continue } // Only list tags in the top level targets role or the releases delegation role - ignore // all other delegation roles if tgt.Role != trust.ReleasesRole && tgt.Role != data.CanonicalTargetsRole { continue } refs = append(refs, t) } if len(refs) == 0 { return nil, trust.NotaryError(ref.Name(), errors.Errorf("No trusted tags for %s", ref.Name())) } return refs, nil } t, err := notaryRepo.GetTargetByName(tagged.Tag(), trust.ReleasesRole, data.CanonicalTargetsRole) if err != nil { return nil, trust.NotaryError(ref.Name(), err) } // Only get the tag if it's in the top level targets role or the releases delegation role // ignore it if it's in any other delegation roles if t.Role != trust.ReleasesRole && t.Role != data.CanonicalTargetsRole { return nil, trust.NotaryError(ref.Name(), errors.Errorf("No trust data for %s", tagged.Tag())) } logrus.Debugf("retrieving target for %s role", t.Role) r, err := convertTarget(t.Target) return []target{r}, err } // imagePullPrivileged pulls the image and displays it to the output func imagePullPrivileged(ctx context.Context, cli command.Cli, imgRefAndAuth trust.ImageRefAndAuth, opts PullOptions) error { ref := reference.FamiliarString(imgRefAndAuth.Reference()) encodedAuth, err := command.EncodeAuthToBase64(*imgRefAndAuth.AuthConfig()) if err != nil { return err } requestPrivilege := command.RegistryAuthenticationPrivilegedFunc(cli, imgRefAndAuth.RepoInfo().Index, "pull") options := types.ImagePullOptions{ RegistryAuth: encodedAuth, PrivilegeFunc: requestPrivilege, All: opts.all, Platform: opts.platform, } responseBody, err := cli.Client().ImagePull(ctx, ref, options) if err != nil { return err } defer responseBody.Close() out := cli.Out() if opts.quiet { out = streams.NewOut(ioutil.Discard) } return jsonmessage.DisplayJSONMessagesToStream(responseBody, out, nil) } // TrustedReference returns the canonical trusted reference for an image reference func TrustedReference(ctx context.Context, cli command.Cli, ref reference.NamedTagged, rs registry.Service) (reference.Canonical, error) { imgRefAndAuth, err := trust.GetImageReferencesAndAuth(ctx, rs, AuthResolver(cli), ref.String()) if err != nil { return nil, err } notaryRepo, err := cli.NotaryClient(imgRefAndAuth, []string{"pull"}) if err != nil { return nil, errors.Wrap(err, "error establishing connection to trust repository") } t, err := notaryRepo.GetTargetByName(ref.Tag(), trust.ReleasesRole, data.CanonicalTargetsRole) if err != nil { return nil, trust.NotaryError(imgRefAndAuth.RepoInfo().Name.Name(), err) } // Only list tags in the top level targets role or the releases delegation role - ignore // all other delegation roles if t.Role != trust.ReleasesRole && t.Role != data.CanonicalTargetsRole { return nil, trust.NotaryError(imgRefAndAuth.RepoInfo().Name.Name(), client.ErrNoSuchTarget(ref.Tag())) } r, err := convertTarget(t.Target) if err != nil { return nil, err } return reference.WithDigest(reference.TrimNamed(ref), r.digest) } func convertTarget(t client.Target) (target, error) { h, ok := t.Hashes["sha256"] if !ok { return target{}, errors.New("no valid hash, expecting sha256") } return target{ name: t.Name, digest: digest.NewDigestFromHex("sha256", hex.EncodeToString(h)), size: t.Length, }, nil } // TagTrusted tags a trusted ref // nolint: interfacer func TagTrusted(ctx context.Context, cli command.Cli, trustedRef reference.Canonical, ref reference.NamedTagged) error { // Use familiar references when interacting with client and output familiarRef := reference.FamiliarString(ref) trustedFamiliarRef := reference.FamiliarString(trustedRef) fmt.Fprintf(cli.Err(), "Tagging %s as %s\n", trustedFamiliarRef, familiarRef) return cli.Client().ImageTag(ctx, trustedFamiliarRef, familiarRef) } // AuthResolver returns an auth resolver function from a command.Cli func AuthResolver(cli command.Cli) func(ctx context.Context, index *registrytypes.IndexInfo) types.AuthConfig { return func(ctx context.Context, index *registrytypes.IndexInfo) types.AuthConfig { return command.ResolveAuthConfig(ctx, cli, index) } }