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Merge pull request #1869 from mtrmac/generate-keys
Add (skopeo generate-sigstore-key)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package main | ||
|
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| import ( | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "io/fs" | ||
| "os" | ||
|
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| "github.com/containers/image/v5/pkg/cli" | ||
| "github.com/containers/image/v5/signature/sigstore" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
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| type generateSigstoreKeyOptions struct { | ||
| outputPrefix string | ||
| passphraseFile string | ||
| } | ||
|
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| func generateSigstoreKeyCmd() *cobra.Command { | ||
| var opts generateSigstoreKeyOptions | ||
| cmd := &cobra.Command{ | ||
| Use: "generate-sigstore-key [command options] --output-prefix PREFIX", | ||
| Short: "Generate a sigstore public/private key pair", | ||
| RunE: commandAction(opts.run), | ||
| Example: "skopeo generate-sigstore-key --output-prefix my-key", | ||
| } | ||
| adjustUsage(cmd) | ||
| flags := cmd.Flags() | ||
| flags.StringVar(&opts.outputPrefix, "output-prefix", "", "Write the keys to `PREFIX`.pub and `PREFIX`.private") | ||
| flags.StringVar(&opts.passphraseFile, "passphrase-file", "", "Read a passphrase for the private key from `PATH`") | ||
| return cmd | ||
| } | ||
|
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| // ensurePathDoesNotExist verifies that path does not refer to an existing file, | ||
| // and returns an error if so. | ||
| func ensurePathDoesNotExist(path string) error { | ||
| switch _, err := os.Stat(path); { | ||
| case err == nil: | ||
| return fmt.Errorf("Refusing to overwrite existing %q", path) | ||
| case errors.Is(err, fs.ErrNotExist): | ||
| return nil | ||
| default: | ||
| return fmt.Errorf("Error checking existence of %q: %w", path, err) | ||
| } | ||
| } | ||
|
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| func (opts *generateSigstoreKeyOptions) run(args []string, stdout io.Writer) error { | ||
| if len(args) != 0 || opts.outputPrefix == "" { | ||
| return errors.New("Usage: generate-sigstore-key --output-prefix PREFIX") | ||
| } | ||
|
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| pubKeyPath := opts.outputPrefix + ".pub" | ||
| privateKeyPath := opts.outputPrefix + ".private" | ||
| if err := ensurePathDoesNotExist(pubKeyPath); err != nil { | ||
| return err | ||
| } | ||
| if err := ensurePathDoesNotExist(privateKeyPath); err != nil { | ||
| return err | ||
| } | ||
|
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| var passphrase string | ||
| if opts.passphraseFile != "" { | ||
| p, err := cli.ReadPassphraseFile(opts.passphraseFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| passphrase = p | ||
| } else { | ||
| p, err := promptForPassphrase(privateKeyPath, os.Stdin, os.Stdout) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| passphrase = p | ||
| } | ||
|
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| keys, err := sigstore.GenerateKeyPair([]byte(passphrase)) | ||
| if err != nil { | ||
| return fmt.Errorf("Error generating key pair: %w", err) | ||
| } | ||
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| if err := os.WriteFile(privateKeyPath, keys.PrivateKey, 0600); err != nil { | ||
| return fmt.Errorf("Error writing private key to %q: %w", privateKeyPath, err) | ||
| } | ||
| if err := os.WriteFile(pubKeyPath, keys.PublicKey, 0644); err != nil { | ||
| return fmt.Errorf("Error writing private key to %q: %w", pubKeyPath, err) | ||
| } | ||
| fmt.Fprintf(stdout, "Key written to %q and %q", privateKeyPath, pubKeyPath) | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package main | ||
|
|
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| import ( | ||
| "os" | ||
| "path/filepath" | ||
| "testing" | ||
|
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| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
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| func TestGenerateSigstoreKey(t *testing.T) { | ||
| // Invalid command-line arguments | ||
| for _, args := range [][]string{ | ||
| {}, | ||
| {"--output-prefix", "foo", "a1"}, | ||
| } { | ||
| out, err := runSkopeo(append([]string{"generate-sigstore-key"}, args...)...) | ||
| assertTestFailed(t, out, err, "Usage") | ||
| } | ||
|
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| // One of the destination files already exists | ||
| outputSuffixes := []string{".pub", ".private"} | ||
| for _, suffix := range outputSuffixes { | ||
| dir := t.TempDir() | ||
| prefix := filepath.Join(dir, "prefix") | ||
| err := os.WriteFile(prefix+suffix, []byte{}, 0600) | ||
| require.NoError(t, err) | ||
| out, err := runSkopeo("generate-sigstore-key", | ||
| "--output-prefix", prefix, "--passphrase-file", "/dev/null", | ||
| ) | ||
| assertTestFailed(t, out, err, "Refusing to overwrite") | ||
| } | ||
|
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| // One of the destinations is inaccessible (simulate by a symlink that tries to | ||
| // traverse a non-directory) | ||
| for _, suffix := range outputSuffixes { | ||
| dir := t.TempDir() | ||
| nonDirectory := filepath.Join(dir, "nondirectory") | ||
| err := os.WriteFile(nonDirectory, []byte{}, 0600) | ||
| require.NoError(t, err) | ||
| prefix := filepath.Join(dir, "prefix") | ||
| err = os.Symlink(filepath.Join(nonDirectory, "unaccessible"), prefix+suffix) | ||
| require.NoError(t, err) | ||
| out, err := runSkopeo("generate-sigstore-key", | ||
| "--output-prefix", prefix, "--passphrase-file", "/dev/null", | ||
| ) | ||
| assertTestFailed(t, out, err, prefix+suffix) // + an OS-specific error message | ||
| } | ||
| destDir := t.TempDir() | ||
| // Error reading passphrase | ||
| out, err := runSkopeo("generate-sigstore-key", | ||
| "--output-prefix", filepath.Join(destDir, "prefix"), | ||
| "--passphrase-file", filepath.Join(destDir, "this-does-not-exist"), | ||
| ) | ||
| assertTestFailed(t, out, err, "this-does-not-exist") | ||
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| // (The interactive passphrase prompting is not yet tested) | ||
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| // Error writing outputs is untested: when unit tests run as root, we can’t use permissions on a directory to cause write failures, | ||
| // with the --output-prefix mechanism, and refusing to even start writing to pre-exisiting files, directories are the only mechanism | ||
| // we have to trigger a write failure. | ||
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| // Success | ||
| // Just a smoke-test, useability of the keys is tested in the generate implementation. | ||
| dir := t.TempDir() | ||
| prefix := filepath.Join(dir, "prefix") | ||
| passphraseFile := filepath.Join(dir, "passphrase") | ||
| err = os.WriteFile(passphraseFile, []byte("some passphrase"), 0600) | ||
| require.NoError(t, err) | ||
| out, err = runSkopeo("generate-sigstore-key", | ||
| "--output-prefix", prefix, "--passphrase-file", passphraseFile, | ||
| ) | ||
| assert.NoError(t, err) | ||
| for _, suffix := range outputSuffixes { | ||
| assert.Contains(t, out, prefix+suffix) | ||
| } | ||
|
|
||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| % skopeo-generate-sigstore-key(1) | ||
|
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| ## NAME | ||
| skopeo\-generate-sigstore-key - Generate a sigstore public/private key pair. | ||
|
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| ## SYNOPSIS | ||
| **skopeo generate-sigstore-key** [*options*] **--output-prefix** _prefix_ | ||
|
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| ## DESCRIPTION | ||
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| Generates a public/private key pair suitable for creating sigstore image signatures. | ||
| The private key is encrypted with a passphrase; | ||
| if one is not provided using an option, this command prompts for it interactively. | ||
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| The private key is written to _prefix_**.private** . | ||
| The private key is written to _prefix_**.pub** . | ||
|
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| ## OPTIONS | ||
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| **--help**, **-h** | ||
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| Print usage statement | ||
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| **--output-prefix** _prefix_ | ||
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| Mandatory. | ||
| Path prefix for the output keys (_prefix_**.private** and _prefix_**.pub**). | ||
|
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| **--passphrase-file** _path_ | ||
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| The passphare to use to encrypt the private key. | ||
| Only the first line will be read. | ||
| A passphrase stored in a file is of questionable security if other users can read this file. | ||
| Do not use this option if at all avoidable. | ||
|
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| ## EXAMPLES | ||
|
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| ```sh | ||
| $ skopeo generate-sigstore-key --output-prefix mykey | ||
| ``` | ||
|
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| # SEE ALSO | ||
| skopeo(1), skopeo-copy(1), containers-policy.json(5) | ||
|
|
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| ## AUTHORS | ||
|
|
||
| Miloslav Trmač <[email protected]> |
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