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// Copyright 2018 Google LLC All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package validate
import (
"bytes"
"errors"
"fmt"
"strings"
"github.com/google/go-cmp/cmp"
"github.com/google/go-containerregistry/pkg/logs"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/types"
)
// Index validates that idx does not violate any invariants of the index format.
func Index(idx v1.ImageIndex, opt ...Option) error {
errs := []string{}
if err := validateChildren(idx, opt...); err != nil {
errs = append(errs, fmt.Sprintf("validating children: %v", err))
}
if err := validateIndexManifest(idx); err != nil {
errs = append(errs, fmt.Sprintf("validating index manifest: %v", err))
}
if len(errs) != 0 {
return errors.New(strings.Join(errs, "\n\n"))
}
return nil
}
type withLayer interface {
Layer(v1.Hash) (v1.Layer, error)
}
func validateChildren(idx v1.ImageIndex, opt ...Option) error {
manifest, err := idx.IndexManifest()
if err != nil {
return err
}
errs := []string{}
for i, desc := range manifest.Manifests {
switch desc.MediaType {
case types.OCIImageIndex, types.DockerManifestList:
idx, err := idx.ImageIndex(desc.Digest)
if err != nil {
return err
}
if err := Index(idx, opt...); err != nil {
errs = append(errs, fmt.Sprintf("failed to validate index Manifests[%d](%s): %v", i, desc.Digest, err))
}
if err := validateMediaType(idx, desc.MediaType); err != nil {
errs = append(errs, fmt.Sprintf("failed to validate index MediaType[%d](%s): %v", i, desc.Digest, err))
}
case types.OCIManifestSchema1, types.DockerManifestSchema2:
img, err := idx.Image(desc.Digest)
if err != nil {
return err
}
if err := Image(img, opt...); err != nil {
errs = append(errs, fmt.Sprintf("failed to validate image Manifests[%d](%s): %v", i, desc.Digest, err))
}
if err := validateMediaType(img, desc.MediaType); err != nil {
errs = append(errs, fmt.Sprintf("failed to validate image MediaType[%d](%s): %v", i, desc.Digest, err))
}
default:
// Workaround for #819.
if wl, ok := idx.(withLayer); ok {
layer, err := wl.Layer(desc.Digest)
if err != nil {
return fmt.Errorf("failed to get layer Manifests[%d]: %w", i, err)
}
if err := Layer(layer, opt...); err != nil {
lerr := fmt.Sprintf("failed to validate layer Manifests[%d](%s): %v", i, desc.Digest, err)
if desc.MediaType.IsDistributable() {
errs = append(errs, lerr)
} else {
logs.Warn.Printf("nondistributable layer failure: %v", lerr)
}
}
} else {
logs.Warn.Printf("Unexpected manifest: %s", desc.MediaType)
}
}
}
if len(errs) != 0 {
return errors.New(strings.Join(errs, "\n"))
}
return nil
}
type withMediaType interface {
MediaType() (types.MediaType, error)
}
func validateMediaType(i withMediaType, want types.MediaType) error {
got, err := i.MediaType()
if err != nil {
return err
}
if want != got {
return fmt.Errorf("mismatched mediaType: MediaType() = %v != %v", got, want)
}
return nil
}
func validateIndexManifest(idx v1.ImageIndex) error {
digest, err := idx.Digest()
if err != nil {
return err
}
size, err := idx.Size()
if err != nil {
return err
}
rm, err := idx.RawManifest()
if err != nil {
return err
}
hash, _, err := v1.SHA256(bytes.NewReader(rm))
if err != nil {
return err
}
m, err := idx.IndexManifest()
if err != nil {
return err
}
pm, err := v1.ParseIndexManifest(bytes.NewReader(rm))
if err != nil {
return err
}
errs := []string{}
if digest != hash {
errs = append(errs, fmt.Sprintf("mismatched manifest digest: Digest()=%s, SHA256(RawManifest())=%s", digest, hash))
}
if diff := cmp.Diff(pm, m); diff != "" {
errs = append(errs, fmt.Sprintf("mismatched manifest content: (-ParseIndexManifest(RawManifest()) +Manifest()) %s", diff))
}
if size != int64(len(rm)) {
errs = append(errs, fmt.Sprintf("mismatched manifest size: Size()=%d, len(RawManifest())=%d", size, len(rm)))
}
if len(errs) != 0 {
return errors.New(strings.Join(errs, "\n"))
}
return nil
}
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