DockerCLI/cli/command/image/trust.go

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package image
import (
"context"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"sort"
"github.com/docker/cli/cli/command"
"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, platform string) 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, false, platform); 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, all bool, platform string) 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: all,
Platform: platform,
}
responseBody, err := cli.Client().ImagePull(ctx, ref, options)
if err != nil {
return err
}
defer responseBody.Close()
return jsonmessage.DisplayJSONMessagesToStream(responseBody, cli.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)
}
}