67 lines
2.7 KiB
Go
67 lines
2.7 KiB
Go
package common
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import (
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"fmt"
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"os"
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"github.com/containers/common/pkg/ssh"
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"github.com/containers/image/v5/pkg/cli"
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"github.com/containers/image/v5/pkg/cli/sigstore"
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"github.com/containers/image/v5/signature/signer"
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"github.com/containers/podman/v4/pkg/domain/entities"
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)
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// PrepareSigning updates pushOpts.Signers, pushOpts.SignPassphrase and SignSigstorePrivateKeyPassphrase based on a --sign-passphrase-file
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// value signPassphraseFile and a --sign-by-sigsstore value signBySigstoreParamFile, and validates pushOpts.Sign* consistency.
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// It may interactively prompt for a passphrase if one is required and wasn’t provided otherwise;
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// or it may interactively trigger an OIDC authentication, using standard input/output, or even open a web browser.
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// Returns a cleanup callback on success, which must be called when done.
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func PrepareSigning(pushOpts *entities.ImagePushOptions,
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signPassphraseFile, signBySigstoreParamFile string) (func(), error) {
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// c/common/libimage.Image does allow creating both simple signing and sigstore signatures simultaneously,
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// with independent passphrases, but that would make the CLI probably too confusing.
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// For now, use the passphrase with either, but only one of them.
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if signPassphraseFile != "" && pushOpts.SignBy != "" && pushOpts.SignBySigstorePrivateKeyFile != "" {
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return nil, fmt.Errorf("only one of --sign-by and sign-by-sigstore-private-key can be used with --sign-passphrase-file")
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}
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var passphrase string
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if signPassphraseFile != "" {
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p, err := cli.ReadPassphraseFile(signPassphraseFile)
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if err != nil {
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return nil, err
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}
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passphrase = p
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} else if pushOpts.SignBySigstorePrivateKeyFile != "" {
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p := ssh.ReadPassphrase()
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passphrase = string(p)
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} // pushOpts.SignBy triggers a GPG-agent passphrase prompt, possibly using a more secure channel, so we usually shouldn’t prompt ourselves if no passphrase was explicitly provided.
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pushOpts.SignPassphrase = passphrase
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pushOpts.SignSigstorePrivateKeyPassphrase = []byte(passphrase)
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cleanup := signingCleanup{}
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if signBySigstoreParamFile != "" {
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signer, err := sigstore.NewSignerFromParameterFile(signBySigstoreParamFile, &sigstore.Options{
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PrivateKeyPassphrasePrompt: cli.ReadPassphraseFile,
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Stdin: os.Stdin,
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Stdout: os.Stdout,
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})
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if err != nil {
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return nil, err
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}
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pushOpts.Signers = append(pushOpts.Signers, signer)
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cleanup.signers = append(cleanup.signers, signer)
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}
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return cleanup.cleanup, nil
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}
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// signingCleanup carries state for cleanup after PrepareSigning
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type signingCleanup struct {
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signers []*signer.Signer
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}
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func (c *signingCleanup) cleanup() {
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for _, s := range c.signers {
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s.Close()
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}
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}
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