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attestation.go
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attestation.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 attach
import (
"context"
"encoding/json"
"fmt"
"os"
"github.com/google/go-containerregistry/pkg/name"
ssldsse "github.com/secure-systems-lab/go-securesystemslib/dsse"
"github.com/sigstore/cosign/cmd/cosign/cli/options"
"github.com/sigstore/cosign/pkg/oci/mutate"
ociremote "github.com/sigstore/cosign/pkg/oci/remote"
"github.com/sigstore/cosign/pkg/oci/static"
"github.com/sigstore/cosign/pkg/types"
)
func AttestationCmd(ctx context.Context, regOpts options.RegistryOptions, signedPayload, imageRef string) error {
ociremoteOpts, err := regOpts.ClientOpts(ctx)
if err != nil {
return fmt.Errorf("constructing client options: %w", err)
}
fmt.Fprintln(os.Stderr, "Using payload from:", signedPayload)
payload, err := os.ReadFile(signedPayload)
if err != nil {
return err
}
if len(payload) == 0 {
return fmt.Errorf("%s payload is empty", signedPayload)
}
env := ssldsse.Envelope{}
if err := json.Unmarshal(payload, &env); err != nil {
return err
}
if env.PayloadType != types.IntotoPayloadType {
return fmt.Errorf("invalid payloadType %s on envelope. Expected %s", env.PayloadType, types.IntotoPayloadType)
}
if len(env.Signatures) == 0 {
return fmt.Errorf("could not attach attestation without having signatures")
}
ref, err := name.ParseReference(imageRef)
if err != nil {
return err
}
digest, err := ociremote.ResolveDigest(ref, ociremoteOpts...)
if err != nil {
return err
}
// Overwrite "ref" with a digest to avoid a race where we use a tag
// multiple times, and it potentially points to different things at
// each access.
ref = digest // nolint
opts := []static.Option{static.WithLayerMediaType(types.DssePayloadType)}
att, err := static.NewAttestation(payload, opts...)
if err != nil {
return err
}
se, err := ociremote.SignedEntity(digest, ociremoteOpts...)
if err != nil {
return err
}
newSE, err := mutate.AttachAttestationToEntity(se, att)
if err != nil {
return err
}
// Publish the signatures associated with this entity
return ociremote.WriteAttestations(digest.Repository, newSE, ociremoteOpts...)
}