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sget.go
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sget.go
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//
// Copyright 2021 The Sigstore Authors.
//
// 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 cli
import (
"context"
"errors"
"io"
"github.com/google/go-containerregistry/pkg/authn"
"github.com/google/go-containerregistry/pkg/name"
"github.com/google/go-containerregistry/pkg/v1/remote"
"github.com/sigstore/cosign/cmd/cosign/cli"
"github.com/sigstore/cosign/cmd/cosign/cli/fulcio"
"github.com/sigstore/cosign/pkg/cosign"
)
func SgetCmd(ctx context.Context, imageRef, keyRef string) (io.ReadCloser, error) {
ref, err := name.ParseReference(imageRef)
if err != nil {
return nil, err
}
if _, ok := ref.(name.Tag); ok {
if keyRef == "" && !cli.EnableExperimental() {
return nil, errors.New("public key must be specified when fetching by tag, you must fetch by digest or supply a public key")
}
}
co := &cosign.CheckOpts{
ClaimVerifier: cosign.SimpleClaimVerifier,
VerifyBundle: true,
RegistryClientOpts: []remote.Option{
remote.WithAuthFromKeychain(authn.DefaultKeychain),
remote.WithContext(ctx),
},
}
if keyRef != "" {
pub, err := cli.LoadPublicKey(ctx, keyRef)
if err != nil {
return nil, err
}
co.SigVerifier = pub
}
if co.SigVerifier != nil || cli.EnableExperimental() {
co.RootCerts = fulcio.GetRoots()
sigRepo, err := cli.TargetRepositoryForImage(ref)
if err != nil {
return nil, err
}
co.SignatureRepo = sigRepo
sp, err := cosign.Verify(ctx, ref, co)
if err != nil {
return nil, err
}
cli.PrintVerificationHeader(imageRef, co)
cli.PrintVerification(imageRef, sp, "text")
}
img, err := remote.Image(ref, co.RegistryClientOpts...)
if err != nil {
return nil, err
}
layers, err := img.Layers()
if err != nil {
return nil, err
}
if len(layers) != 1 {
return nil, errors.New("invalid artifact")
}
rc, err := layers[0].Compressed()
if err != nil {
return nil, err
}
return rc, nil
}