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generate_key_pair.go
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/
generate_key_pair.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 generate
import (
"context"
"crypto"
"errors"
"fmt"
"io"
"os"
"strings"
"github.com/sigstore/cosign/pkg/cosign/git"
"github.com/sigstore/cosign/pkg/cosign/git/github"
"github.com/sigstore/cosign/pkg/cosign/git/gitlab"
"github.com/sigstore/cosign/pkg/cosign"
"github.com/sigstore/cosign/pkg/cosign/kubernetes"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"github.com/sigstore/sigstore/pkg/signature/kms"
)
var (
// Read is for fuzzing
Read = readPasswordFn
)
// nolint
func GenerateKeyPairCmd(ctx context.Context, kmsVal string, args []string) error {
if kmsVal != "" {
k, err := kms.Get(ctx, kmsVal, crypto.SHA256)
if err != nil {
return err
}
pubKey, err := k.CreateKey(ctx, k.DefaultAlgorithm())
if err != nil {
return fmt.Errorf("creating key: %w", err)
}
pemBytes, err := cryptoutils.MarshalPublicKeyToPEM(pubKey)
if err != nil {
return err
}
if err := os.WriteFile("cosign.pub", pemBytes, 0600); err != nil {
return err
}
fmt.Fprintln(os.Stderr, "Public key written to cosign.pub")
return nil
}
if len(args) > 0 {
split := strings.Split(args[0], "://")
if len(split) < 2 {
return errors.New("could not parse scheme, use <scheme>://<ref> format")
}
provider, targetRef := split[0], split[1]
switch provider {
case "k8s":
return kubernetes.KeyPairSecret(ctx, targetRef, GetPass)
case gitlab.ReferenceScheme, github.ReferenceScheme:
return git.GetProvider(provider).PutSecret(ctx, targetRef, GetPass)
}
return fmt.Errorf("undefined provider: %s", provider)
}
keys, err := cosign.GenerateKeyPair(GetPass)
if err != nil {
return err
}
if cosign.FileExists("cosign.key") {
var overwrite string
fmt.Fprint(os.Stderr, "File cosign.key already exists. Overwrite (y/n)? ")
fmt.Scanf("%s", &overwrite)
switch overwrite {
case "y", "Y":
case "n", "N":
return nil
default:
fmt.Fprintln(os.Stderr, "Invalid input")
return nil
}
}
// TODO: make sure the perms are locked down first.
if err := os.WriteFile("cosign.key", keys.PrivateBytes, 0600); err != nil {
return err
}
fmt.Fprintln(os.Stderr, "Private key written to cosign.key")
if err := os.WriteFile("cosign.pub", keys.PublicBytes, 0644); err != nil {
return err
} // #nosec G306
fmt.Fprintln(os.Stderr, "Public key written to cosign.pub")
return nil
}
func GetPass(confirm bool) ([]byte, error) {
read := Read(confirm)
return read()
}
func readPasswordFn(confirm bool) func() ([]byte, error) {
pw, ok := os.LookupEnv("COSIGN_PASSWORD")
switch {
case ok:
return func() ([]byte, error) {
return []byte(pw), nil
}
case cosign.IsTerminal():
return func() ([]byte, error) {
return cosign.GetPassFromTerm(confirm)
}
// Handle piped in passwords.
default:
return func() ([]byte, error) {
return io.ReadAll(os.Stdin)
}
}
}