Add … push --sign-by-sigstore

cmd/podman/common/sign.go

@@ -2,28 +2,34 @@ package common
 
 import (
 	"fmt"
+	"os"
 
 	"github.com/containers/common/pkg/ssh"
 	"github.com/containers/image/v5/pkg/cli"
+	"github.com/containers/image/v5/pkg/cli/sigstore"
+	"github.com/containers/image/v5/signature/signer"
 	"github.com/containers/podman/v4/pkg/domain/entities"
 )
 
-// PrepareSigningPassphrase updates pushOpts.SignPassphrase and SignSigstorePrivateKeyPassphrase based on a --sign-passphrase-file value signPassphraseFile,
-// and validates pushOpts.Sign* consistency.
-// It may interactively prompt for a passphrase if one is required and wasn’t provided otherwise.
-func PrepareSigningPassphrase(pushOpts *entities.ImagePushOptions, signPassphraseFile string) error {
+// PrepareSigning updates pushOpts.Signers, pushOpts.SignPassphrase and SignSigstorePrivateKeyPassphrase based on a --sign-passphrase-file
+// value signPassphraseFile and a --sign-by-sigsstore value signBySigstoreParamFile, and validates pushOpts.Sign* consistency.
+// It may interactively prompt for a passphrase if one is required and wasn’t provided otherwise;
+// or it may interactively trigger an OIDC authentication, using standard input/output, or even open a web browser.
+// Returns a cleanup callback on success, which must be called when done.
+func PrepareSigning(pushOpts *entities.ImagePushOptions,
+	signPassphraseFile, signBySigstoreParamFile string) (func(), error) {
 	// c/common/libimage.Image does allow creating both simple signing and sigstore signatures simultaneously,
 	// with independent passphrases, but that would make the CLI probably too confusing.
 	// For now, use the passphrase with either, but only one of them.
 	if signPassphraseFile != "" && pushOpts.SignBy != "" && pushOpts.SignBySigstorePrivateKeyFile != "" {
-		return fmt.Errorf("only one of --sign-by and sign-by-sigstore-private-key can be used with --sign-passphrase-file")
+		return nil, fmt.Errorf("only one of --sign-by and sign-by-sigstore-private-key can be used with --sign-passphrase-file")
 	}
 
 	var passphrase string
 	if signPassphraseFile != "" {
 		p, err := cli.ReadPassphraseFile(signPassphraseFile)
 		if err != nil {
-			return err
+			return nil, err
 		}
 		passphrase = p
 	} else if pushOpts.SignBySigstorePrivateKeyFile != "" {
@@ -32,5 +38,29 @@ func PrepareSigningPassphrase(pushOpts *entities.ImagePushOptions, signPassphras
 	} // 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.
 	pushOpts.SignPassphrase = passphrase
 	pushOpts.SignSigstorePrivateKeyPassphrase = []byte(passphrase)
-	return nil
+	cleanup := signingCleanup{}
+	if signBySigstoreParamFile != "" {
+		signer, err := sigstore.NewSignerFromParameterFile(signBySigstoreParamFile, &sigstore.Options{
+			PrivateKeyPassphrasePrompt: cli.ReadPassphraseFile,
+			Stdin:                      os.Stdin,
+			Stdout:                     os.Stdout,
+		})
+		if err != nil {
+			return nil, err
+		}
+		pushOpts.Signers = append(pushOpts.Signers, signer)
+		cleanup.signers = append(cleanup.signers, signer)
+	}
+	return cleanup.cleanup, nil
+}
+
+// signingCleanup carries state for cleanup after PrepareSigning
+type signingCleanup struct {
+	signers []*signer.Signer
+}
+
+func (c *signingCleanup) cleanup() {
+	for _, s := range c.signers {
+		s.Close()
+	}
 }

cmd/podman/images/push.go

@@ -18,11 +18,12 @@ import (
 // CLI-only fields into the API types.
 type pushOptionsWrapper struct {
 	entities.ImagePushOptions
-	TLSVerifyCLI          bool // CLI only
-	CredentialsCLI        string
-	SignPassphraseFileCLI string
-	EncryptionKeys        []string
-	EncryptLayers         []int
+	TLSVerifyCLI               bool // CLI only
+	CredentialsCLI             string
+	SignPassphraseFileCLI      string
+	SignBySigstoreParamFileCLI string
+	EncryptionKeys             []string
+	EncryptLayers              []int
 }
 
 var (
@@ -110,6 +111,10 @@ func pushFlags(cmd *cobra.Command) {
 	flags.StringVar(&pushOptions.SignBy, signByFlagName, "", "Add a signature at the destination using the specified key")
 	_ = cmd.RegisterFlagCompletionFunc(signByFlagName, completion.AutocompleteNone)
 
+	signBySigstoreFlagName := "sign-by-sigstore"
+	flags.StringVar(&pushOptions.SignBySigstoreParamFileCLI, signBySigstoreFlagName, "", "Sign the image using a sigstore parameter file at `PATH`")
+	_ = cmd.RegisterFlagCompletionFunc(signBySigstoreFlagName, completion.AutocompleteDefault)
+
 	signBySigstorePrivateKeyFlagName := "sign-by-sigstore-private-key"
 	flags.StringVar(&pushOptions.SignBySigstorePrivateKeyFile, signBySigstorePrivateKeyFlagName, "", "Sign the image using a sigstore private key at `PATH`")
 	_ = cmd.RegisterFlagCompletionFunc(signBySigstorePrivateKeyFlagName, completion.AutocompleteDefault)
@@ -138,6 +143,7 @@ func pushFlags(cmd *cobra.Command) {
 		_ = flags.MarkHidden("digestfile")
 		_ = flags.MarkHidden("quiet")
 		_ = flags.MarkHidden(signByFlagName)
+		_ = flags.MarkHidden(signBySigstoreFlagName)
 		_ = flags.MarkHidden(signBySigstorePrivateKeyFlagName)
 		_ = flags.MarkHidden(signPassphraseFileFlagName)
 		_ = flags.MarkHidden(encryptionKeysFlagName)
@@ -181,9 +187,12 @@ func imagePush(cmd *cobra.Command, args []string) error {
 		pushOptions.Writer = os.Stderr
 	}
 
-	if err := common.PrepareSigningPassphrase(&pushOptions.ImagePushOptions, pushOptions.SignPassphraseFileCLI); err != nil {
+	signingCleanup, err := common.PrepareSigning(&pushOptions.ImagePushOptions,
+		pushOptions.SignPassphraseFileCLI, pushOptions.SignBySigstoreParamFileCLI)
+	if err != nil {
 		return err
 	}
+	defer signingCleanup()
 
 	encConfig, encLayers, err := util.EncryptConfig(pushOptions.EncryptionKeys, pushOptions.EncryptLayers)
 	if err != nil {

cmd/podman/manifest/push.go

@@ -21,9 +21,10 @@ import (
 type manifestPushOptsWrapper struct {
 	entities.ImagePushOptions
 
-	TLSVerifyCLI, Insecure bool // CLI only
-	CredentialsCLI         string
-	SignPassphraseFileCLI  string
+	TLSVerifyCLI, Insecure     bool // CLI only
+	CredentialsCLI             string
+	SignBySigstoreParamFileCLI string
+	SignPassphraseFileCLI      string
 }
 
 var (
@@ -76,6 +77,10 @@ func init() {
 	flags.StringVar(&manifestPushOpts.SignBy, signByFlagName, "", "sign the image using a GPG key with the specified `FINGERPRINT`")
 	_ = pushCmd.RegisterFlagCompletionFunc(signByFlagName, completion.AutocompleteNone)
 
+	signBySigstoreFlagName := "sign-by-sigstore"
+	flags.StringVar(&manifestPushOpts.SignBySigstoreParamFileCLI, signBySigstoreFlagName, "", "Sign the image using a sigstore parameter file at `PATH`")
+	_ = pushCmd.RegisterFlagCompletionFunc(signBySigstoreFlagName, completion.AutocompleteDefault)
+
 	signBySigstorePrivateKeyFlagName := "sign-by-sigstore-private-key"
 	flags.StringVar(&manifestPushOpts.SignBySigstorePrivateKeyFile, signBySigstorePrivateKeyFlagName, "", "Sign the image using a sigstore private key at `PATH`")
 	_ = pushCmd.RegisterFlagCompletionFunc(signBySigstorePrivateKeyFlagName, completion.AutocompleteDefault)
@@ -97,6 +102,7 @@ func init() {
 	if registry.IsRemote() {
 		_ = flags.MarkHidden("cert-dir")
 		_ = flags.MarkHidden(signByFlagName)
+		_ = flags.MarkHidden(signBySigstoreFlagName)
 		_ = flags.MarkHidden(signBySigstorePrivateKeyFlagName)
 		_ = flags.MarkHidden(signPassphraseFileFlagName)
 	}
@@ -128,9 +134,12 @@ func push(cmd *cobra.Command, args []string) error {
 		manifestPushOpts.Writer = os.Stderr
 	}
 
-	if err := common.PrepareSigningPassphrase(&manifestPushOpts.ImagePushOptions, manifestPushOpts.SignPassphraseFileCLI); err != nil {
+	signingCleanup, err := common.PrepareSigning(&manifestPushOpts.ImagePushOptions,
+		manifestPushOpts.SignPassphraseFileCLI, manifestPushOpts.SignBySigstoreParamFileCLI)
+	if err != nil {
 		return err
 	}
+	defer signingCleanup()
 
 	// TLS verification in c/image is controlled via a `types.OptionalBool`
 	// which allows for distinguishing among set-true, set-false, unspecified

docs/source/markdown/podman-manifest-push.1.md.in

@@ -49,6 +49,11 @@ Delete the manifest list or image index from local storage if pushing succeeds.
 
 Sign the pushed images with a “simple signing” signature using the specified key. (This option is not available with the remote Podman client, including Mac and Windows (excluding WSL2) machines)
 
+#### **--sign-by-sigstore**=*param-file***
+
+Add a sigstore signature based on further options specified in a containers sigstore signing parameter file *param-file*.
+See containers-sigstore-signing-params.yaml(5) for details about the file format.
+
 #### **--sign-by-sigstore-private-key**=*path*
 
 Sign the pushed images with a sigstore signature using a private key at the specified path. (This option is not available with the remote Podman client, including Mac and Windows (excluding WSL2) machines)

docs/source/markdown/podman-push.1.md.in

@@ -87,6 +87,11 @@ Discard any pre-existing signatures in the image.
 
 Add a “simple signing” signature at the destination using the specified key. (This option is not available with the remote Podman client, including Mac and Windows (excluding WSL2) machines)
 
+#### **--sign-by-sigstore**=*param-file***
+
+Add a sigstore signature based on further options specified in a containers sigstore signing parameter file *param-file*.
+See containers-sigstore-signing-params.yaml(5) for details about the file format.
+
 #### **--sign-by-sigstore-private-key**=*path*
 
 Add a sigstore signature at the destination using a private key at the specified path. (This option is not available with the remote Podman client, including Mac and Windows (excluding WSL2) machines)

go.mod

@@ -82,6 +82,7 @@ require (
 	github.com/containerd/containerd v1.6.15 // indirect
 	github.com/containerd/stargz-snapshotter/estargz v0.13.0 // indirect
 	github.com/containers/libtrust v0.0.0-20230121012942-c1716e8a8d01 // indirect
+	github.com/coreos/go-oidc/v3 v3.5.0 // indirect
 	github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f // indirect
 	github.com/cyberphone/json-canonicalization v0.0.0-20220623050100-57a0ce2678a7 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
@@ -91,6 +92,7 @@ require (
 	github.com/docker/docker-credential-helpers v0.7.0 // indirect
 	github.com/felixge/httpsnoop v1.0.3 // indirect
 	github.com/fsouza/go-dockerclient v1.9.3 // indirect
+	github.com/go-jose/go-jose/v3 v3.0.0 // indirect
 	github.com/go-openapi/analysis v0.21.4 // indirect
 	github.com/go-openapi/errors v0.20.3 // indirect
 	github.com/go-openapi/jsonpointer v0.19.5 // indirect
@@ -101,20 +103,27 @@ require (
 	github.com/go-openapi/strfmt v0.21.3 // indirect
 	github.com/go-openapi/swag v0.22.3 // indirect
 	github.com/go-openapi/validate v0.22.0 // indirect
+	github.com/go-playground/locales v0.14.0 // indirect
+	github.com/go-playground/universal-translator v0.18.0 // indirect
+	github.com/go-playground/validator/v10 v10.11.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/go-containerregistry v0.12.1 // indirect
 	github.com/google/go-intervals v0.0.2 // indirect
+	github.com/google/trillian v1.5.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.2 // indirect
 	github.com/imdario/mergo v0.3.13 // indirect
 	github.com/inconshreveable/mousetrap v1.0.1 // indirect
 	github.com/jinzhu/copier v0.3.5 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/klauspost/compress v1.15.15 // indirect
 	github.com/klauspost/pgzip v1.2.6-0.20220930104621-17e8dac29df8 // indirect
 	github.com/kr/fs v0.1.0 // indirect
+	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/letsencrypt/boulder v0.0.0-20221109233200-85aa52084eaf // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/manifoldco/promptui v0.9.0 // indirect
@@ -128,16 +137,19 @@ require (
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/opentracing/opentracing-go v1.2.0 // indirect
 	github.com/ostreedev/ostree-go v0.0.0-20210805093236-719684c64e4f // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pkg/sftp v1.13.5 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/proglottis/gpgme v0.1.3 // indirect
 	github.com/rivo/uniseg v0.4.3 // indirect
 	github.com/seccomp/libseccomp-golang v0.10.0 // indirect
+	github.com/segmentio/ksuid v1.0.4 // indirect
 	github.com/sigstore/fulcio v1.0.0 // indirect
 	github.com/sigstore/rekor v1.0.1 // indirect
 	github.com/sigstore/sigstore v1.5.1 // indirect
+	github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966 // indirect
 	github.com/stefanberger/go-pkcs11uri v0.0.0-20201008174630-78d3cae3a980 // indirect
 	github.com/sylabs/sif/v2 v2.9.0 // indirect
 	github.com/tchap/go-patricia v2.3.0+incompatible // indirect
@@ -153,7 +165,9 @@ require (
 	go.opencensus.io v0.24.0 // indirect
 	golang.org/x/crypto v0.5.0 // indirect
 	golang.org/x/mod v0.7.0 // indirect
+	golang.org/x/oauth2 v0.4.0 // indirect
 	golang.org/x/tools v0.4.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
 	google.golang.org/genproto v0.0.0-20221227171554-f9683d7f8bef // indirect
 	google.golang.org/grpc v1.51.0 // indirect
 	gopkg.in/square/go-jose.v2 v2.6.0 // indirect