2e94c22fe4
When get manifest, the handler will try to retrieve it from storage driver. When storage driver is cloud storage, it can fail due to various reasons even if the manifest exists (like 500, 503, etc. from storage server). Currently manifest handler blindly return 404 which can be confusing to user. This change will return 404 if the manifest blob doesn't exist, and return 500 UnknownError for all other errors (consistent with the behavior of other handlers). Signed-off-by: Yu Wang (UC) <yuwa@microsoft.com>
477 lines
14 KiB
Go
477 lines
14 KiB
Go
package handlers
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/docker/distribution"
|
|
ctxu "github.com/docker/distribution/context"
|
|
"github.com/docker/distribution/manifest/manifestlist"
|
|
"github.com/docker/distribution/manifest/schema1"
|
|
"github.com/docker/distribution/manifest/schema2"
|
|
"github.com/docker/distribution/reference"
|
|
"github.com/docker/distribution/registry/api/errcode"
|
|
"github.com/docker/distribution/registry/api/v2"
|
|
"github.com/docker/distribution/registry/auth"
|
|
"github.com/gorilla/handlers"
|
|
"github.com/opencontainers/go-digest"
|
|
)
|
|
|
|
// These constants determine which architecture and OS to choose from a
|
|
// manifest list when downconverting it to a schema1 manifest.
|
|
const (
|
|
defaultArch = "amd64"
|
|
defaultOS = "linux"
|
|
)
|
|
|
|
// manifestDispatcher takes the request context and builds the
|
|
// appropriate handler for handling manifest requests.
|
|
func manifestDispatcher(ctx *Context, r *http.Request) http.Handler {
|
|
manifestHandler := &manifestHandler{
|
|
Context: ctx,
|
|
}
|
|
reference := getReference(ctx)
|
|
dgst, err := digest.Parse(reference)
|
|
if err != nil {
|
|
// We just have a tag
|
|
manifestHandler.Tag = reference
|
|
} else {
|
|
manifestHandler.Digest = dgst
|
|
}
|
|
|
|
mhandler := handlers.MethodHandler{
|
|
"GET": http.HandlerFunc(manifestHandler.GetManifest),
|
|
"HEAD": http.HandlerFunc(manifestHandler.GetManifest),
|
|
}
|
|
|
|
if !ctx.readOnly {
|
|
mhandler["PUT"] = http.HandlerFunc(manifestHandler.PutManifest)
|
|
mhandler["DELETE"] = http.HandlerFunc(manifestHandler.DeleteManifest)
|
|
}
|
|
|
|
return mhandler
|
|
}
|
|
|
|
// manifestHandler handles http operations on image manifests.
|
|
type manifestHandler struct {
|
|
*Context
|
|
|
|
// One of tag or digest gets set, depending on what is present in context.
|
|
Tag string
|
|
Digest digest.Digest
|
|
}
|
|
|
|
// GetManifest fetches the image manifest from the storage backend, if it exists.
|
|
func (imh *manifestHandler) GetManifest(w http.ResponseWriter, r *http.Request) {
|
|
ctxu.GetLogger(imh).Debug("GetImageManifest")
|
|
manifests, err := imh.Repository.Manifests(imh)
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, err)
|
|
return
|
|
}
|
|
|
|
var manifest distribution.Manifest
|
|
if imh.Tag != "" {
|
|
tags := imh.Repository.Tags(imh)
|
|
desc, err := tags.Get(imh, imh.Tag)
|
|
if err != nil {
|
|
if _, ok := err.(distribution.ErrTagUnknown); ok {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
|
|
} else {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
|
|
}
|
|
return
|
|
}
|
|
imh.Digest = desc.Digest
|
|
}
|
|
|
|
if etagMatch(r, imh.Digest.String()) {
|
|
w.WriteHeader(http.StatusNotModified)
|
|
return
|
|
}
|
|
|
|
var options []distribution.ManifestServiceOption
|
|
if imh.Tag != "" {
|
|
options = append(options, distribution.WithTag(imh.Tag))
|
|
}
|
|
manifest, err = manifests.Get(imh, imh.Digest, options...)
|
|
if err != nil {
|
|
if _, ok := err.(distribution.ErrManifestUnknownRevision); ok {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
|
|
} else {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
|
|
}
|
|
return
|
|
}
|
|
|
|
supportsSchema2 := false
|
|
supportsManifestList := false
|
|
// this parsing of Accept headers is not quite as full-featured as godoc.org's parser, but we don't care about "q=" values
|
|
// https://github.com/golang/gddo/blob/e91d4165076d7474d20abda83f92d15c7ebc3e81/httputil/header/header.go#L165-L202
|
|
for _, acceptHeader := range r.Header["Accept"] {
|
|
// r.Header[...] is a slice in case the request contains the same header more than once
|
|
// if the header isn't set, we'll get the zero value, which "range" will handle gracefully
|
|
|
|
// we need to split each header value on "," to get the full list of "Accept" values (per RFC 2616)
|
|
// https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
|
|
for _, mediaType := range strings.Split(acceptHeader, ",") {
|
|
// remove "; q=..." if present
|
|
if i := strings.Index(mediaType, ";"); i >= 0 {
|
|
mediaType = mediaType[:i]
|
|
}
|
|
|
|
// it's common (but not required) for Accept values to be space separated ("a/b, c/d, e/f")
|
|
mediaType = strings.TrimSpace(mediaType)
|
|
|
|
if mediaType == schema2.MediaTypeManifest {
|
|
supportsSchema2 = true
|
|
}
|
|
if mediaType == manifestlist.MediaTypeManifestList {
|
|
supportsManifestList = true
|
|
}
|
|
}
|
|
}
|
|
|
|
schema2Manifest, isSchema2 := manifest.(*schema2.DeserializedManifest)
|
|
manifestList, isManifestList := manifest.(*manifestlist.DeserializedManifestList)
|
|
|
|
// Only rewrite schema2 manifests when they are being fetched by tag.
|
|
// If they are being fetched by digest, we can't return something not
|
|
// matching the digest.
|
|
if imh.Tag != "" && isSchema2 && !supportsSchema2 {
|
|
// Rewrite manifest in schema1 format
|
|
ctxu.GetLogger(imh).Infof("rewriting manifest %s in schema1 format to support old client", imh.Digest.String())
|
|
|
|
manifest, err = imh.convertSchema2Manifest(schema2Manifest)
|
|
if err != nil {
|
|
return
|
|
}
|
|
} else if imh.Tag != "" && isManifestList && !supportsManifestList {
|
|
// Rewrite manifest in schema1 format
|
|
ctxu.GetLogger(imh).Infof("rewriting manifest list %s in schema1 format to support old client", imh.Digest.String())
|
|
|
|
// Find the image manifest corresponding to the default
|
|
// platform
|
|
var manifestDigest digest.Digest
|
|
for _, manifestDescriptor := range manifestList.Manifests {
|
|
if manifestDescriptor.Platform.Architecture == defaultArch && manifestDescriptor.Platform.OS == defaultOS {
|
|
manifestDigest = manifestDescriptor.Digest
|
|
break
|
|
}
|
|
}
|
|
|
|
if manifestDigest == "" {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown)
|
|
return
|
|
}
|
|
|
|
manifest, err = manifests.Get(imh, manifestDigest)
|
|
if err != nil {
|
|
if _, ok := err.(distribution.ErrManifestUnknownRevision); ok {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown.WithDetail(err))
|
|
} else {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
|
|
}
|
|
return
|
|
}
|
|
|
|
// If necessary, convert the image manifest
|
|
if schema2Manifest, isSchema2 := manifest.(*schema2.DeserializedManifest); isSchema2 && !supportsSchema2 {
|
|
manifest, err = imh.convertSchema2Manifest(schema2Manifest)
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
ct, p, err := manifest.Payload()
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
w.Header().Set("Content-Type", ct)
|
|
w.Header().Set("Content-Length", fmt.Sprint(len(p)))
|
|
w.Header().Set("Docker-Content-Digest", imh.Digest.String())
|
|
w.Header().Set("Etag", fmt.Sprintf(`"%s"`, imh.Digest))
|
|
w.Write(p)
|
|
}
|
|
|
|
func (imh *manifestHandler) convertSchema2Manifest(schema2Manifest *schema2.DeserializedManifest) (distribution.Manifest, error) {
|
|
targetDescriptor := schema2Manifest.Target()
|
|
blobs := imh.Repository.Blobs(imh)
|
|
configJSON, err := blobs.Get(imh, targetDescriptor.Digest)
|
|
if err != nil {
|
|
if err == distribution.ErrBlobUnknown {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestInvalid.WithDetail(err))
|
|
} else {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
|
|
}
|
|
return nil, err
|
|
}
|
|
|
|
ref := imh.Repository.Named()
|
|
|
|
if imh.Tag != "" {
|
|
ref, err = reference.WithTag(ref, imh.Tag)
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeTagInvalid.WithDetail(err))
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
builder := schema1.NewConfigManifestBuilder(imh.Repository.Blobs(imh), imh.Context.App.trustKey, ref, configJSON)
|
|
for _, d := range schema2Manifest.Layers {
|
|
if err := builder.AppendReference(d); err != nil {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestInvalid.WithDetail(err))
|
|
return nil, err
|
|
}
|
|
}
|
|
manifest, err := builder.Build(imh)
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestInvalid.WithDetail(err))
|
|
return nil, err
|
|
}
|
|
imh.Digest = digest.FromBytes(manifest.(*schema1.SignedManifest).Canonical)
|
|
|
|
return manifest, nil
|
|
}
|
|
|
|
func etagMatch(r *http.Request, etag string) bool {
|
|
for _, headerVal := range r.Header["If-None-Match"] {
|
|
if headerVal == etag || headerVal == fmt.Sprintf(`"%s"`, etag) { // allow quoted or unquoted
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// PutManifest validates and stores a manifest in the registry.
|
|
func (imh *manifestHandler) PutManifest(w http.ResponseWriter, r *http.Request) {
|
|
ctxu.GetLogger(imh).Debug("PutImageManifest")
|
|
manifests, err := imh.Repository.Manifests(imh)
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, err)
|
|
return
|
|
}
|
|
|
|
var jsonBuf bytes.Buffer
|
|
if err := copyFullPayload(w, r, &jsonBuf, imh, "image manifest PUT", &imh.Errors); err != nil {
|
|
// copyFullPayload reports the error if necessary
|
|
return
|
|
}
|
|
|
|
mediaType := r.Header.Get("Content-Type")
|
|
manifest, desc, err := distribution.UnmarshalManifest(mediaType, jsonBuf.Bytes())
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestInvalid.WithDetail(err))
|
|
return
|
|
}
|
|
|
|
if imh.Digest != "" {
|
|
if desc.Digest != imh.Digest {
|
|
ctxu.GetLogger(imh).Errorf("payload digest does match: %q != %q", desc.Digest, imh.Digest)
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeDigestInvalid)
|
|
return
|
|
}
|
|
} else if imh.Tag != "" {
|
|
imh.Digest = desc.Digest
|
|
} else {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeTagInvalid.WithDetail("no tag or digest specified"))
|
|
return
|
|
}
|
|
|
|
var options []distribution.ManifestServiceOption
|
|
if imh.Tag != "" {
|
|
options = append(options, distribution.WithTag(imh.Tag))
|
|
}
|
|
|
|
if err := imh.applyResourcePolicy(manifest); err != nil {
|
|
imh.Errors = append(imh.Errors, err)
|
|
return
|
|
}
|
|
|
|
_, err = manifests.Put(imh, manifest, options...)
|
|
if err != nil {
|
|
// TODO(stevvooe): These error handling switches really need to be
|
|
// handled by an app global mapper.
|
|
if err == distribution.ErrUnsupported {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnsupported)
|
|
return
|
|
}
|
|
if err == distribution.ErrAccessDenied {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeDenied)
|
|
return
|
|
}
|
|
switch err := err.(type) {
|
|
case distribution.ErrManifestVerification:
|
|
for _, verificationError := range err {
|
|
switch verificationError := verificationError.(type) {
|
|
case distribution.ErrManifestBlobUnknown:
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestBlobUnknown.WithDetail(verificationError.Digest))
|
|
case distribution.ErrManifestNameInvalid:
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeNameInvalid.WithDetail(err))
|
|
case distribution.ErrManifestUnverified:
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnverified)
|
|
default:
|
|
if verificationError == digest.ErrDigestInvalidFormat {
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeDigestInvalid)
|
|
} else {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown, verificationError)
|
|
}
|
|
}
|
|
}
|
|
case errcode.Error:
|
|
imh.Errors = append(imh.Errors, err)
|
|
default:
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// Tag this manifest
|
|
if imh.Tag != "" {
|
|
tags := imh.Repository.Tags(imh)
|
|
err = tags.Tag(imh, imh.Tag, desc)
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
|
|
return
|
|
}
|
|
|
|
}
|
|
|
|
// Construct a canonical url for the uploaded manifest.
|
|
ref, err := reference.WithDigest(imh.Repository.Named(), imh.Digest)
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
|
|
return
|
|
}
|
|
|
|
location, err := imh.urlBuilder.BuildManifestURL(ref)
|
|
if err != nil {
|
|
// NOTE(stevvooe): Given the behavior above, this absurdly unlikely to
|
|
// happen. We'll log the error here but proceed as if it worked. Worst
|
|
// case, we set an empty location header.
|
|
ctxu.GetLogger(imh).Errorf("error building manifest url from digest: %v", err)
|
|
}
|
|
|
|
w.Header().Set("Location", location)
|
|
w.Header().Set("Docker-Content-Digest", imh.Digest.String())
|
|
w.WriteHeader(http.StatusCreated)
|
|
}
|
|
|
|
// applyResourcePolicy checks whether the resource class matches what has
|
|
// been authorized and allowed by the policy configuration.
|
|
func (imh *manifestHandler) applyResourcePolicy(manifest distribution.Manifest) error {
|
|
allowedClasses := imh.App.Config.Policy.Repository.Classes
|
|
if len(allowedClasses) == 0 {
|
|
return nil
|
|
}
|
|
|
|
var class string
|
|
switch m := manifest.(type) {
|
|
case *schema1.SignedManifest:
|
|
class = "image"
|
|
case *schema2.DeserializedManifest:
|
|
switch m.Config.MediaType {
|
|
case schema2.MediaTypeImageConfig:
|
|
class = "image"
|
|
case schema2.MediaTypePluginConfig:
|
|
class = "plugin"
|
|
default:
|
|
message := fmt.Sprintf("unknown manifest class for %s", m.Config.MediaType)
|
|
return errcode.ErrorCodeDenied.WithMessage(message)
|
|
}
|
|
}
|
|
|
|
if class == "" {
|
|
return nil
|
|
}
|
|
|
|
// Check to see if class is allowed in registry
|
|
var allowedClass bool
|
|
for _, c := range allowedClasses {
|
|
if class == c {
|
|
allowedClass = true
|
|
break
|
|
}
|
|
}
|
|
if !allowedClass {
|
|
message := fmt.Sprintf("registry does not allow %s manifest", class)
|
|
return errcode.ErrorCodeDenied.WithMessage(message)
|
|
}
|
|
|
|
resources := auth.AuthorizedResources(imh)
|
|
n := imh.Repository.Named().Name()
|
|
|
|
var foundResource bool
|
|
for _, r := range resources {
|
|
if r.Name == n {
|
|
if r.Class == "" {
|
|
r.Class = "image"
|
|
}
|
|
if r.Class == class {
|
|
return nil
|
|
}
|
|
foundResource = true
|
|
}
|
|
}
|
|
|
|
// resource was found but no matching class was found
|
|
if foundResource {
|
|
message := fmt.Sprintf("repository not authorized for %s manifest", class)
|
|
return errcode.ErrorCodeDenied.WithMessage(message)
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
// DeleteManifest removes the manifest with the given digest from the registry.
|
|
func (imh *manifestHandler) DeleteManifest(w http.ResponseWriter, r *http.Request) {
|
|
ctxu.GetLogger(imh).Debug("DeleteImageManifest")
|
|
|
|
manifests, err := imh.Repository.Manifests(imh)
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, err)
|
|
return
|
|
}
|
|
|
|
err = manifests.Delete(imh, imh.Digest)
|
|
if err != nil {
|
|
switch err {
|
|
case digest.ErrDigestUnsupported:
|
|
case digest.ErrDigestInvalidFormat:
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeDigestInvalid)
|
|
return
|
|
case distribution.ErrBlobUnknown:
|
|
imh.Errors = append(imh.Errors, v2.ErrorCodeManifestUnknown)
|
|
return
|
|
case distribution.ErrUnsupported:
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnsupported)
|
|
return
|
|
default:
|
|
imh.Errors = append(imh.Errors, errcode.ErrorCodeUnknown)
|
|
return
|
|
}
|
|
}
|
|
|
|
tagService := imh.Repository.Tags(imh)
|
|
referencedTags, err := tagService.Lookup(imh, distribution.Descriptor{Digest: imh.Digest})
|
|
if err != nil {
|
|
imh.Errors = append(imh.Errors, err)
|
|
return
|
|
}
|
|
|
|
for _, tag := range referencedTags {
|
|
if err := tagService.Untag(imh, tag); err != nil {
|
|
imh.Errors = append(imh.Errors, err)
|
|
return
|
|
}
|
|
}
|
|
|
|
w.WriteHeader(http.StatusAccepted)
|
|
}
|