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signblob.go
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signblob.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 (
"fmt"
"os"
"github.com/pkg/errors"
"github.com/sigstore/cosign/cmd/cosign/cli/generate"
"github.com/sigstore/cosign/cmd/cosign/cli/options"
"github.com/sigstore/cosign/cmd/cosign/cli/sign"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
func SignBlob() *cobra.Command {
o := &options.SignBlobOptions{}
viper.RegisterAlias("output", "output-signature")
cmd := &cobra.Command{
Use: "sign-blob",
Short: "Sign the supplied blob, outputting the base64-encoded signature to stdout.",
Example: ` cosign sign-blob --key <key path>|<kms uri> <blob>
# sign a blob with Google sign-in (experimental)
COSIGN_EXPERIMENTAL=1 cosign --timeout 90s sign-blob <FILE>
# sign a blob with a local key pair file
cosign sign-blob --key cosign.key <FILE>
# sign a blob with a key pair stored in Azure Key Vault
cosign sign-blob --key azurekms://[VAULT_NAME][VAULT_URI]/[KEY] <FILE>
# sign a blob with a key pair stored in AWS KMS
cosign sign-blob --key awskms://[ENDPOINT]/[ID/ALIAS/ARN] <FILE>
# sign a blob with a key pair stored in Google Cloud KMS
cosign sign-blob --key gcpkms://projects/[PROJECT]/locations/global/keyRings/[KEYRING]/cryptoKeys/[KEY] <FILE>
# sign a blob with a key pair stored in Hashicorp Vault
cosign sign-blob --key hashivault://[KEY] <FILE>`,
Args: cobra.MinimumNArgs(1),
PreRunE: func(cmd *cobra.Command, args []string) error {
// A key file is required unless we're in experimental mode!
if !options.EnableExperimental() {
if !options.OneOf(o.Key, o.SecurityKey.Use) {
return &options.KeyParseError{}
}
}
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
oidcClientSecret, err := o.OIDC.ClientSecret()
if err != nil {
return err
}
ko := options.KeyOpts{
KeyRef: o.Key,
PassFunc: generate.GetPass,
Sk: o.SecurityKey.Use,
Slot: o.SecurityKey.Slot,
FulcioURL: o.Fulcio.URL,
IDToken: o.Fulcio.IdentityToken,
InsecureSkipFulcioVerify: o.Fulcio.InsecureSkipFulcioVerify,
RekorURL: o.Rekor.URL,
OIDCIssuer: o.OIDC.Issuer,
OIDCClientID: o.OIDC.ClientID,
OIDCClientSecret: oidcClientSecret,
OIDCRedirectURL: o.OIDC.RedirectURL,
BundlePath: o.BundlePath,
}
for _, blob := range args {
// TODO: remove when the output flag has been deprecated
if o.Output != "" {
fmt.Fprintln(os.Stderr, "WARNING: the '--output' flag is deprecated and will be removed in the future. Use '--output-signature'")
o.OutputSignature = o.Output
}
if _, err := sign.SignBlobCmd(ro, ko, o.Registry, blob, o.Base64Output, o.OutputSignature, o.OutputCertificate); err != nil {
return errors.Wrapf(err, "signing %s", blob)
}
}
return nil
},
}
o.AddFlags(cmd)
return cmd
}