mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
382 lines
12 KiB
Go
382 lines
12 KiB
Go
package image
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import (
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"path"
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"sort"
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"github.com/Sirupsen/logrus"
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"github.com/docker/distribution/reference"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/cli/command"
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"github.com/docker/docker/cli/trust"
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"github.com/docker/docker/pkg/jsonmessage"
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"github.com/docker/docker/registry"
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"github.com/docker/notary/client"
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"github.com/docker/notary/tuf/data"
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"github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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"golang.org/x/net/context"
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)
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type target struct {
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name string
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digest digest.Digest
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size int64
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}
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// trustedPush handles content trust pushing of an image
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func trustedPush(ctx context.Context, cli *command.DockerCli, repoInfo *registry.RepositoryInfo, ref reference.Named, authConfig types.AuthConfig, requestPrivilege types.RequestPrivilegeFunc) error {
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responseBody, err := imagePushPrivileged(ctx, cli, authConfig, ref, requestPrivilege)
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if err != nil {
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return err
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}
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defer responseBody.Close()
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return PushTrustedReference(cli, repoInfo, ref, authConfig, responseBody)
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}
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// PushTrustedReference pushes a canonical reference to the trust server.
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func PushTrustedReference(cli *command.DockerCli, repoInfo *registry.RepositoryInfo, ref reference.Named, authConfig types.AuthConfig, in io.Reader) error {
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// If it is a trusted push we would like to find the target entry which match the
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// tag provided in the function and then do an AddTarget later.
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target := &client.Target{}
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// Count the times of calling for handleTarget,
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// if it is called more that once, that should be considered an error in a trusted push.
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cnt := 0
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handleTarget := func(aux *json.RawMessage) {
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cnt++
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if cnt > 1 {
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// handleTarget should only be called one. This will be treated as an error.
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return
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}
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var pushResult types.PushResult
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err := json.Unmarshal(*aux, &pushResult)
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if err == nil && pushResult.Tag != "" {
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if dgst, err := digest.Parse(pushResult.Digest); err == nil {
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h, err := hex.DecodeString(dgst.Hex())
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if err != nil {
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target = nil
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return
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}
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target.Name = pushResult.Tag
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target.Hashes = data.Hashes{string(dgst.Algorithm()): h}
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target.Length = int64(pushResult.Size)
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}
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}
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}
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var tag string
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switch x := ref.(type) {
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case reference.Canonical:
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return errors.New("cannot push a digest reference")
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case reference.NamedTagged:
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tag = x.Tag()
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default:
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// We want trust signatures to always take an explicit tag,
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// otherwise it will act as an untrusted push.
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if err := jsonmessage.DisplayJSONMessagesToStream(in, cli.Out(), nil); err != nil {
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return err
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}
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fmt.Fprintln(cli.Out(), "No tag specified, skipping trust metadata push")
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return nil
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}
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if err := jsonmessage.DisplayJSONMessagesToStream(in, cli.Out(), handleTarget); err != nil {
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return err
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}
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if cnt > 1 {
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return errors.Errorf("internal error: only one call to handleTarget expected")
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}
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if target == nil {
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fmt.Fprintln(cli.Out(), "No targets found, please provide a specific tag in order to sign it")
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return nil
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}
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fmt.Fprintln(cli.Out(), "Signing and pushing trust metadata")
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repo, err := trust.GetNotaryRepository(cli, repoInfo, authConfig, "push", "pull")
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if err != nil {
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fmt.Fprintf(cli.Out(), "Error establishing connection to notary repository: %s\n", err)
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return err
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}
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// get the latest repository metadata so we can figure out which roles to sign
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err = repo.Update(false)
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switch err.(type) {
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case client.ErrRepoNotInitialized, client.ErrRepositoryNotExist:
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keys := repo.CryptoService.ListKeys(data.CanonicalRootRole)
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var rootKeyID string
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// always select the first root key
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if len(keys) > 0 {
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sort.Strings(keys)
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rootKeyID = keys[0]
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} else {
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rootPublicKey, err := repo.CryptoService.Create(data.CanonicalRootRole, "", data.ECDSAKey)
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if err != nil {
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return err
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}
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rootKeyID = rootPublicKey.ID()
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}
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// Initialize the notary repository with a remotely managed snapshot key
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if err := repo.Initialize([]string{rootKeyID}, data.CanonicalSnapshotRole); err != nil {
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return trust.NotaryError(repoInfo.Name.Name(), err)
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}
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fmt.Fprintf(cli.Out(), "Finished initializing %q\n", repoInfo.Name.Name())
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err = repo.AddTarget(target, data.CanonicalTargetsRole)
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case nil:
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// already initialized and we have successfully downloaded the latest metadata
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err = addTargetToAllSignableRoles(repo, target)
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default:
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return trust.NotaryError(repoInfo.Name.Name(), err)
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}
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if err == nil {
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err = repo.Publish()
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}
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if err != nil {
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fmt.Fprintf(cli.Out(), "Failed to sign %q:%s - %s\n", repoInfo.Name.Name(), tag, err.Error())
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return trust.NotaryError(repoInfo.Name.Name(), err)
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}
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fmt.Fprintf(cli.Out(), "Successfully signed %q:%s\n", repoInfo.Name.Name(), tag)
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return nil
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}
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// Attempt to add the image target to all the top level delegation roles we can
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// (based on whether we have the signing key and whether the role's path allows
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// us to).
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// If there are no delegation roles, we add to the targets role.
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func addTargetToAllSignableRoles(repo *client.NotaryRepository, target *client.Target) error {
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var signableRoles []string
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// translate the full key names, which includes the GUN, into just the key IDs
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allCanonicalKeyIDs := make(map[string]struct{})
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for fullKeyID := range repo.CryptoService.ListAllKeys() {
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allCanonicalKeyIDs[path.Base(fullKeyID)] = struct{}{}
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}
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allDelegationRoles, err := repo.GetDelegationRoles()
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if err != nil {
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return err
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}
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// if there are no delegation roles, then just try to sign it into the targets role
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if len(allDelegationRoles) == 0 {
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return repo.AddTarget(target, data.CanonicalTargetsRole)
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}
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// there are delegation roles, find every delegation role we have a key for, and
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// attempt to sign into into all those roles.
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for _, delegationRole := range allDelegationRoles {
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// We do not support signing any delegation role that isn't a direct child of the targets role.
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// Also don't bother checking the keys if we can't add the target
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// to this role due to path restrictions
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if path.Dir(delegationRole.Name) != data.CanonicalTargetsRole || !delegationRole.CheckPaths(target.Name) {
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continue
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}
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for _, canonicalKeyID := range delegationRole.KeyIDs {
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if _, ok := allCanonicalKeyIDs[canonicalKeyID]; ok {
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signableRoles = append(signableRoles, delegationRole.Name)
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break
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}
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}
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}
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if len(signableRoles) == 0 {
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return errors.Errorf("no valid signing keys for delegation roles")
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}
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return repo.AddTarget(target, signableRoles...)
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}
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// imagePushPrivileged push the image
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func imagePushPrivileged(ctx context.Context, cli *command.DockerCli, authConfig types.AuthConfig, ref reference.Named, requestPrivilege types.RequestPrivilegeFunc) (io.ReadCloser, error) {
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encodedAuth, err := command.EncodeAuthToBase64(authConfig)
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if err != nil {
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return nil, err
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}
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options := types.ImagePushOptions{
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RegistryAuth: encodedAuth,
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PrivilegeFunc: requestPrivilege,
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}
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return cli.Client().ImagePush(ctx, reference.FamiliarString(ref), options)
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}
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// trustedPull handles content trust pulling of an image
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func trustedPull(ctx context.Context, cli *command.DockerCli, repoInfo *registry.RepositoryInfo, ref reference.Named, authConfig types.AuthConfig, requestPrivilege types.RequestPrivilegeFunc) error {
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var refs []target
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notaryRepo, err := trust.GetNotaryRepository(cli, repoInfo, authConfig, "pull")
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if err != nil {
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fmt.Fprintf(cli.Out(), "Error establishing connection to trust repository: %s\n", err)
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return err
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}
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if tagged, isTagged := ref.(reference.NamedTagged); !isTagged {
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// List all targets
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targets, err := notaryRepo.ListTargets(trust.ReleasesRole, data.CanonicalTargetsRole)
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if err != nil {
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return trust.NotaryError(ref.Name(), err)
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}
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for _, tgt := range targets {
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t, err := convertTarget(tgt.Target)
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if err != nil {
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fmt.Fprintf(cli.Out(), "Skipping target for %q\n", reference.FamiliarName(ref))
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continue
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}
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// Only list tags in the top level targets role or the releases delegation role - ignore
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// all other delegation roles
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if tgt.Role != trust.ReleasesRole && tgt.Role != data.CanonicalTargetsRole {
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continue
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}
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refs = append(refs, t)
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}
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if len(refs) == 0 {
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return trust.NotaryError(ref.Name(), errors.Errorf("No trusted tags for %s", ref.Name()))
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}
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} else {
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t, err := notaryRepo.GetTargetByName(tagged.Tag(), trust.ReleasesRole, data.CanonicalTargetsRole)
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if err != nil {
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return trust.NotaryError(ref.Name(), err)
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}
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// Only get the tag if it's in the top level targets role or the releases delegation role
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// ignore it if it's in any other delegation roles
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if t.Role != trust.ReleasesRole && t.Role != data.CanonicalTargetsRole {
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return trust.NotaryError(ref.Name(), errors.Errorf("No trust data for %s", tagged.Tag()))
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}
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logrus.Debugf("retrieving target for %s role\n", t.Role)
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r, err := convertTarget(t.Target)
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if err != nil {
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return err
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}
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refs = append(refs, r)
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}
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for i, r := range refs {
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displayTag := r.name
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if displayTag != "" {
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displayTag = ":" + displayTag
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}
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fmt.Fprintf(cli.Out(), "Pull (%d of %d): %s%s@%s\n", i+1, len(refs), reference.FamiliarName(ref), displayTag, r.digest)
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trustedRef, err := reference.WithDigest(reference.TrimNamed(ref), r.digest)
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if err != nil {
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return err
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}
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if err := imagePullPrivileged(ctx, cli, authConfig, reference.FamiliarString(trustedRef), requestPrivilege, false); err != nil {
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return err
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}
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tagged, err := reference.WithTag(reference.TrimNamed(ref), r.name)
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if err != nil {
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return err
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}
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if err := TagTrusted(ctx, cli, trustedRef, tagged); err != nil {
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return err
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}
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}
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return nil
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}
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// imagePullPrivileged pulls the image and displays it to the output
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func imagePullPrivileged(ctx context.Context, cli *command.DockerCli, authConfig types.AuthConfig, ref string, requestPrivilege types.RequestPrivilegeFunc, all bool) error {
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encodedAuth, err := command.EncodeAuthToBase64(authConfig)
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if err != nil {
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return err
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}
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options := types.ImagePullOptions{
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RegistryAuth: encodedAuth,
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PrivilegeFunc: requestPrivilege,
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All: all,
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}
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responseBody, err := cli.Client().ImagePull(ctx, ref, options)
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if err != nil {
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return err
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}
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defer responseBody.Close()
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return jsonmessage.DisplayJSONMessagesToStream(responseBody, cli.Out(), nil)
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}
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// TrustedReference returns the canonical trusted reference for an image reference
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func TrustedReference(ctx context.Context, cli *command.DockerCli, ref reference.NamedTagged, rs registry.Service) (reference.Canonical, error) {
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var (
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repoInfo *registry.RepositoryInfo
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err error
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)
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if rs != nil {
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repoInfo, err = rs.ResolveRepository(ref)
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} else {
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repoInfo, err = registry.ParseRepositoryInfo(ref)
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}
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if err != nil {
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return nil, err
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}
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// Resolve the Auth config relevant for this server
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authConfig := command.ResolveAuthConfig(ctx, cli, repoInfo.Index)
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notaryRepo, err := trust.GetNotaryRepository(cli, repoInfo, authConfig, "pull")
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if err != nil {
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fmt.Fprintf(cli.Out(), "Error establishing connection to trust repository: %s\n", err)
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return nil, err
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}
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t, err := notaryRepo.GetTargetByName(ref.Tag(), trust.ReleasesRole, data.CanonicalTargetsRole)
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if err != nil {
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return nil, trust.NotaryError(repoInfo.Name.Name(), err)
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}
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// Only list tags in the top level targets role or the releases delegation role - ignore
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// all other delegation roles
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if t.Role != trust.ReleasesRole && t.Role != data.CanonicalTargetsRole {
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return nil, trust.NotaryError(repoInfo.Name.Name(), errors.Errorf("No trust data for %s", ref.Tag()))
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}
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r, err := convertTarget(t.Target)
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if err != nil {
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return nil, err
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}
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return reference.WithDigest(reference.TrimNamed(ref), r.digest)
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}
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func convertTarget(t client.Target) (target, error) {
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h, ok := t.Hashes["sha256"]
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if !ok {
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return target{}, errors.New("no valid hash, expecting sha256")
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}
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return target{
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name: t.Name,
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digest: digest.NewDigestFromHex("sha256", hex.EncodeToString(h)),
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size: t.Length,
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}, nil
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}
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// TagTrusted tags a trusted ref
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func TagTrusted(ctx context.Context, cli *command.DockerCli, trustedRef reference.Canonical, ref reference.NamedTagged) error {
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// Use familiar references when interacting with client and output
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familiarRef := reference.FamiliarString(ref)
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trustedFamiliarRef := reference.FamiliarString(trustedRef)
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fmt.Fprintf(cli.Out(), "Tagging %s as %s\n", trustedFamiliarRef, familiarRef)
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return cli.Client().ImageTag(ctx, trustedFamiliarRef, familiarRef)
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}
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