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zot/pkg/extensions/sync/utils.go

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package sync
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/url"
"os"
"path"
"strings"
glob "github.com/bmatcuk/doublestar/v4"
"github.com/containers/image/v5/docker"
"github.com/containers/image/v5/docker/reference"
"github.com/containers/image/v5/oci/layout"
"github.com/containers/image/v5/types"
guuid "github.com/gofrs/uuid"
"github.com/notaryproject/notation-go-lib"
ispec "github.com/opencontainers/image-spec/specs-go/v1"
artifactspec "github.com/oras-project/artifacts-spec/specs-go/v1"
"gopkg.in/resty.v1"
zerr "zotregistry.io/zot/errors"
"zotregistry.io/zot/pkg/common"
"zotregistry.io/zot/pkg/extensions/monitoring"
"zotregistry.io/zot/pkg/log"
"zotregistry.io/zot/pkg/storage"
"zotregistry.io/zot/pkg/test"
)
type ReferenceList struct {
References []notation.Descriptor `json:"references"`
}
// getTagFromRef returns a tagged reference from an image reference.
func getTagFromRef(ref types.ImageReference, log log.Logger) reference.Tagged {
tagged, isTagged := ref.DockerReference().(reference.Tagged)
if !isTagged {
log.Warn().Msgf("internal server error, reference %s does not have a tag, skipping", ref.DockerReference())
}
return tagged
}
// getRepoFromRef returns repo name from a registry ImageReference.
func getRepoFromRef(ref types.ImageReference, registryDomain string) string {
imageName := strings.Replace(ref.DockerReference().Name(), registryDomain, "", 1)
imageName = strings.TrimPrefix(imageName, "/")
return imageName
}
// parseRepositoryReference parses input into a reference.Named, and verifies that it names a repository, not an image.
func parseRepositoryReference(input string) (reference.Named, error) {
ref, err := reference.ParseNormalizedNamed(input)
if err != nil {
return nil, err
}
if !reference.IsNameOnly(ref) {
return nil, zerr.ErrInvalidRepositoryName
}
return ref, nil
}
// filterRepos filters repos based on prefix given in the config.
func filterRepos(repos []string, contentList []Content, log log.Logger) map[int][]string {
filtered := make(map[int][]string)
for _, repo := range repos {
for contentID, content := range contentList {
var prefix string
// handle prefixes starting with '/'
if strings.HasPrefix(content.Prefix, "/") {
prefix = content.Prefix[1:]
} else {
prefix = content.Prefix
}
matched, err := glob.Match(prefix, repo)
if err != nil {
log.Error().Err(err).Str("pattern",
prefix).Msg("error while parsing glob pattern, skipping it...")
continue
}
if matched {
filtered[contentID] = append(filtered[contentID], repo)
break
}
}
}
return filtered
}
// Get sync.FileCredentials from file.
func getFileCredentials(filepath string) (CredentialsFile, error) {
credsFile, err := ioutil.ReadFile(filepath)
if err != nil {
return nil, err
}
var creds CredentialsFile
err = json.Unmarshal(credsFile, &creds)
if err != nil {
return nil, err
}
return creds, nil
}
func getHTTPClient(regCfg *RegistryConfig, upstreamURL string, credentials Credentials,
log log.Logger) (*resty.Client, error) {
client := resty.New()
if !common.Contains(regCfg.URLs, upstreamURL) {
return nil, zerr.ErrSyncInvalidUpstreamURL
}
registryURL, err := url.Parse(upstreamURL)
if err != nil {
log.Error().Err(err).Str("url", upstreamURL).Msg("couldn't parse url")
return nil, err
}
if regCfg.CertDir != "" {
log.Debug().Msgf("sync: using certs directory: %s", regCfg.CertDir)
clientCert := path.Join(regCfg.CertDir, "client.cert")
clientKey := path.Join(regCfg.CertDir, "client.key")
caCertPath := path.Join(regCfg.CertDir, "ca.crt")
caCert, err := ioutil.ReadFile(caCertPath)
if err != nil {
log.Error().Err(err).Msg("couldn't read CA certificate")
return nil, err
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
client.SetTLSClientConfig(&tls.Config{RootCAs: caCertPool, MinVersion: tls.VersionTLS12})
cert, err := tls.LoadX509KeyPair(clientCert, clientKey)
if err != nil {
log.Error().Err(err).Msg("couldn't read certificates key pairs")
return nil, err
}
client.SetCertificates(cert)
}
// nolint: gosec
if regCfg.TLSVerify != nil && !*regCfg.TLSVerify && registryURL.Scheme == "https" {
client.SetTLSClientConfig(&tls.Config{InsecureSkipVerify: true})
}
if credentials.Username != "" && credentials.Password != "" {
log.Debug().Msgf("sync: using basic auth")
client.SetBasicAuth(credentials.Username, credentials.Password)
}
return client, nil
}
func syncCosignSignature(client *resty.Client, storeController storage.StoreController,
regURL url.URL, repo, digest string, log log.Logger) error {
log.Info().Msg("syncing cosign signatures")
getCosignManifestURL := regURL
if !isCosignTag(digest) {
digest = strings.Replace(digest, ":", "-", 1) + ".sig"
}
getCosignManifestURL.Path = path.Join(getCosignManifestURL.Path, "v2", repo, "manifests", digest)
getCosignManifestURL.RawQuery = getCosignManifestURL.Query().Encode()
mResp, err := client.R().Get(getCosignManifestURL.String())
if err != nil {
log.Error().Err(err).Str("url", getCosignManifestURL.String()).
Msgf("couldn't get cosign manifest: %s", digest)
return err
}
if mResp.IsError() {
log.Info().Msgf("couldn't find any cosign signature from %s, status code: %d skipping",
getCosignManifestURL.String(), mResp.StatusCode())
return nil
}
var m ispec.Manifest
err = json.Unmarshal(mResp.Body(), &m)
if err != nil {
log.Error().Err(err).Str("url", getCosignManifestURL.String()).
Msgf("couldn't unmarshal cosign manifest %s", digest)
return err
}
imageStore := storeController.GetImageStore(repo)
for _, blob := range m.Layers {
// get blob
getBlobURL := regURL
getBlobURL.Path = path.Join(getBlobURL.Path, "v2", repo, "blobs", blob.Digest.String())
getBlobURL.RawQuery = getBlobURL.Query().Encode()
resp, err := client.R().SetDoNotParseResponse(true).Get(getBlobURL.String())
if err != nil {
log.Error().Err(err).Msgf("couldn't get cosign blob: %s", blob.Digest.String())
return err
}
if resp.IsError() {
log.Info().Msgf("couldn't find cosign blob from %s, status code: %d", getBlobURL.String(), resp.StatusCode())
return zerr.ErrBadBlobDigest
}
defer resp.RawBody().Close()
// push blob
_, _, err = imageStore.FullBlobUpload(repo, resp.RawBody(), blob.Digest.String())
if err != nil {
log.Error().Err(err).Msg("couldn't upload cosign blob")
return err
}
}
// get config blob
getBlobURL := regURL
getBlobURL.Path = path.Join(getBlobURL.Path, "v2", repo, "blobs", m.Config.Digest.String())
getBlobURL.RawQuery = getBlobURL.Query().Encode()
resp, err := client.R().SetDoNotParseResponse(true).Get(getBlobURL.String())
if err != nil {
log.Error().Err(err).Msgf("couldn't get cosign config blob: %s", getBlobURL.String())
return err
}
if resp.IsError() {
log.Info().Msgf("couldn't find cosign config blob from %s, status code: %d", getBlobURL.String(), resp.StatusCode())
return zerr.ErrBadBlobDigest
}
defer resp.RawBody().Close()
// push config blob
_, _, err = imageStore.FullBlobUpload(repo, resp.RawBody(), m.Config.Digest.String())
if err != nil {
log.Error().Err(err).Msg("couldn't upload cosign blob")
return err
}
// push manifest
_, err = imageStore.PutImageManifest(repo, digest, ispec.MediaTypeImageManifest, mResp.Body())
if err != nil {
log.Error().Err(err).Msg("couldn't upload cosing manifest")
return err
}
return nil
}
func syncNotarySignature(client *resty.Client, storeController storage.StoreController,
regURL url.URL, repo, digest string, log log.Logger) error {
log.Info().Msg("syncing notary signatures")
getReferrersURL := regURL
// based on manifest digest get referrers
getReferrersURL.Path = path.Join(getReferrersURL.Path, "oras/artifacts/v1/", repo, "manifests", digest, "referrers")
getReferrersURL.RawQuery = getReferrersURL.Query().Encode()
resp, err := client.R().
SetHeader("Content-Type", "application/json").
SetQueryParam("artifactType", "application/vnd.cncf.notary.v2.signature").
Get(getReferrersURL.String())
if err != nil {
log.Error().Err(err).Msgf("couldn't get referrers from %s", getReferrersURL.String())
return err
}
if resp.IsError() {
log.Info().Msgf("couldn't find any notary signature from %s, status code: %d, skipping",
getReferrersURL.String(), resp.StatusCode())
return nil
}
var referrers ReferenceList
err = json.Unmarshal(resp.Body(), &referrers)
if err != nil {
log.Error().Err(err).Msgf("couldn't unmarshal notary signature from %s", getReferrersURL.String())
return err
}
imageStore := storeController.GetImageStore(repo)
for _, ref := range referrers.References {
// get referrer manifest
getRefManifestURL := regURL
getRefManifestURL.Path = path.Join(getRefManifestURL.Path, "v2", repo, "manifests", ref.Digest.String())
getRefManifestURL.RawQuery = getRefManifestURL.Query().Encode()
resp, err := client.R().
Get(getRefManifestURL.String())
if err != nil {
log.Error().Err(err).Msgf("couldn't get notary manifest: %s", getRefManifestURL.String())
return err
}
// read manifest
var m artifactspec.Manifest
err = json.Unmarshal(resp.Body(), &m)
if err != nil {
log.Error().Err(err).Msgf("couldn't unmarshal notary manifest: %s", getRefManifestURL.String())
return err
}
for _, blob := range m.Blobs {
getBlobURL := regURL
getBlobURL.Path = path.Join(getBlobURL.Path, "v2", repo, "blobs", blob.Digest.String())
getBlobURL.RawQuery = getBlobURL.Query().Encode()
resp, err := client.R().SetDoNotParseResponse(true).Get(getBlobURL.String())
if err != nil {
log.Error().Err(err).Msgf("couldn't get notary blob: %s", getBlobURL.String())
return err
}
defer resp.RawBody().Close()
if resp.IsError() {
log.Info().Msgf("couldn't find notary blob from %s, status code: %d",
getBlobURL.String(), resp.StatusCode())
return zerr.ErrBadBlobDigest
}
_, _, err = imageStore.FullBlobUpload(repo, resp.RawBody(), blob.Digest.String())
if err != nil {
log.Error().Err(err).Msg("couldn't upload notary sig blob")
return err
}
}
_, err = imageStore.PutImageManifest(repo, ref.Digest.String(), artifactspec.MediaTypeArtifactManifest, resp.Body())
if err != nil {
log.Error().Err(err).Msg("couldn't upload notary sig manifest")
return err
}
}
return nil
}
func syncSignatures(client *resty.Client, storeController storage.StoreController,
registryURL, repo, tag string, log log.Logger) error {
log.Info().Msgf("syncing signatures from %s/%s:%s", registryURL, repo, tag)
// get manifest and find out its digest
regURL, err := url.Parse(registryURL)
if err != nil {
log.Error().Err(err).Msgf("couldn't parse registry URL: %s", registryURL)
return err
}
getManifestURL := *regURL
getManifestURL.Path = path.Join(getManifestURL.Path, "v2", repo, "manifests", tag)
resp, err := client.R().SetHeader("Content-Type", "application/json").Head(getManifestURL.String())
if err != nil {
log.Error().Err(err).Str("url", getManifestURL.String()).
Msgf("couldn't query %s", registryURL)
return err
}
digests, ok := resp.Header()["Docker-Content-Digest"]
if !ok {
log.Error().Err(zerr.ErrBadBlobDigest).Str("url", getManifestURL.String()).
Msgf("couldn't get digest for manifest: %s:%s", repo, tag)
return zerr.ErrBadBlobDigest
}
if len(digests) != 1 {
log.Error().Err(zerr.ErrBadBlobDigest).Str("url", getManifestURL.String()).
Msgf("multiple digests found for: %s:%s", repo, tag)
return zerr.ErrBadBlobDigest
}
err = syncNotarySignature(client, storeController, *regURL, repo, digests[0], log)
if err != nil {
return err
}
err = syncCosignSignature(client, storeController, *regURL, repo, digests[0], log)
if err != nil {
return err
}
log.Info().Msgf("successfully synced %s/%s:%s signatures", registryURL, repo, tag)
return nil
}
func pushSyncedLocalImage(repo, tag, localCachePath string,
storeController storage.StoreController, log log.Logger) error {
log.Info().Msgf("pushing synced local image %s/%s:%s to local registry", localCachePath, repo, tag)
imageStore := storeController.GetImageStore(repo)
metrics := monitoring.NewMetricsServer(false, log)
cacheImageStore := storage.NewImageStore(localCachePath, false, storage.DefaultGCDelay, false, false, log, metrics)
manifestContent, _, _, err := cacheImageStore.GetImageManifest(repo, tag)
if err != nil {
log.Error().Err(err).Str("dir", path.Join(cacheImageStore.RootDir(), repo)).Msg("couldn't find index.json")
return err
}
var manifest ispec.Manifest
if err := json.Unmarshal(manifestContent, &manifest); err != nil {
log.Error().Err(err).Str("dir", path.Join(cacheImageStore.RootDir(), repo)).Msg("invalid JSON")
return err
}
for _, blob := range manifest.Layers {
blobReader, _, err := cacheImageStore.GetBlob(repo, blob.Digest.String(), blob.MediaType)
if err != nil {
log.Error().Err(err).Str("dir", path.Join(cacheImageStore.RootDir(),
repo)).Str("blob digest", blob.Digest.String()).Msg("couldn't read blob")
return err
}
_, _, err = imageStore.FullBlobUpload(repo, blobReader, blob.Digest.String())
if err != nil {
log.Error().Err(err).Str("blob digest", blob.Digest.String()).Msg("couldn't upload blob")
return err
}
}
blobReader, _, err := cacheImageStore.GetBlob(repo, manifest.Config.Digest.String(), manifest.Config.MediaType)
if err != nil {
log.Error().Err(err).Str("dir", path.Join(cacheImageStore.RootDir(),
repo)).Str("blob digest", manifest.Config.Digest.String()).Msg("couldn't read config blob")
return err
}
_, _, err = imageStore.FullBlobUpload(repo, blobReader, manifest.Config.Digest.String())
if err != nil {
log.Error().Err(err).Str("blob digest", manifest.Config.Digest.String()).Msg("couldn't upload config blob")
return err
}
_, err = imageStore.PutImageManifest(repo, tag, ispec.MediaTypeImageManifest, manifestContent)
if err != nil {
log.Error().Err(err).Msg("couldn't upload manifest")
return err
}
log.Info().Msgf("removing temporary cached synced repo %s", path.Join(cacheImageStore.RootDir(), repo))
if err := os.RemoveAll(cacheImageStore.RootDir()); err != nil {
log.Error().Err(err).Msg("couldn't remove locally cached sync repo")
return err
}
return nil
}
// sync feature will try to pull cosign signature because for sync cosign signature is just an image
// this function will check if tag is a cosign tag.
func isCosignTag(tag string) bool {
if strings.HasPrefix(tag, "sha256-") && strings.HasSuffix(tag, ".sig") {
return true
}
return false
}
// sync needs transport to be stripped to not be wrongly interpreted as an image reference
// at a non-fully qualified registry (hostname as image and port as tag).
func StripRegistryTransport(url string) string {
return strings.Replace(strings.Replace(url, "http://", "", 1), "https://", "", 1)
}
// get an ImageReference given the registry, repo and tag.
func getImageRef(registryDomain, repo, tag string) (types.ImageReference, error) {
repoRef, err := parseRepositoryReference(fmt.Sprintf("%s/%s", registryDomain, repo))
if err != nil {
return nil, err
}
taggedRepoRef, err := reference.WithTag(repoRef, tag)
if err != nil {
return nil, err
}
imageRef, err := docker.NewReference(taggedRepoRef)
if err != nil {
return nil, err
}
return imageRef, err
}
// get a local ImageReference used to temporary store one synced image.
func getLocalImageRef(imageStore storage.ImageStore, repo, tag string) (types.ImageReference, string, error) {
uuid, err := guuid.NewV4()
// hard to reach test case, injected error, see pkg/test/dev.go
if err := test.Error(err); err != nil {
return nil, "", err
}
localCachePath := path.Join(imageStore.RootDir(), repo, SyncBlobUploadDir, uuid.String())
if err = os.MkdirAll(path.Join(localCachePath, repo), storage.DefaultDirPerms); err != nil {
return nil, "", err
}
localRepo := path.Join(localCachePath, repo)
localTaggedRepo := fmt.Sprintf("%s:%s", localRepo, tag)
localImageRef, err := layout.ParseReference(localTaggedRepo)
if err != nil {
return nil, "", err
}
return localImageRef, localCachePath, nil
}
// canSkipImage returns whether or not the image can be skipped from syncing.
func canSkipImage(repo, tag string, upstreamRef types.ImageReference,
imageStore storage.ImageStore, upstreamCtx *types.SystemContext, log log.Logger) (bool, error) {
// filter already pulled images
_, localImageDigest, _, err := imageStore.GetImageManifest(repo, tag)
if err != nil {
if errors.Is(err, zerr.ErrRepoNotFound) || errors.Is(err, zerr.ErrManifestNotFound) {
return false, nil
}
log.Error().Err(err).Msgf("couldn't get local image %s:%s manifest", repo, tag)
return false, err
}
upstreamImageDigest, err := docker.GetDigest(context.Background(), upstreamCtx, upstreamRef)
if err != nil {
log.Error().Err(err).Msgf("couldn't get upstream image %s manifest", upstreamRef.DockerReference())
return false, err
}
if localImageDigest == string(upstreamImageDigest) {
log.Info().Msgf("skipping syncing %s:%s, image already synced", repo, tag)
return true, nil
}
return false, nil
}