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73 lines
2.1 KiB
73 lines
2.1 KiB
/*
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Copyright The Helm Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package plugin
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import (
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"helm.sh/helm/v4/pkg/provenance"
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)
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// VerifyPlugin verifies a plugin tarball against a signature.
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//
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// This function verifies that a plugin tarball has a valid provenance file
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// and that the provenance file is signed by a trusted entity.
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func VerifyPlugin(pluginPath, keyring string) (*provenance.Verification, error) {
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// Verify the plugin path exists
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fi, err := os.Stat(pluginPath)
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if err != nil {
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return nil, err
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}
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// Only support tarball verification
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if fi.IsDir() {
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return nil, errors.New("directory verification not supported - only plugin tarballs can be verified")
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}
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// Verify it's a tarball
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if !isTarball(pluginPath) {
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return nil, errors.New("plugin file must be a gzipped tarball (.tar.gz or .tgz)")
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}
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// Look for provenance file
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provFile := pluginPath + ".prov"
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if _, err := os.Stat(provFile); err != nil {
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return nil, fmt.Errorf("could not find provenance file %s: %w", provFile, err)
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}
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// Create signatory from keyring
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sig, err := provenance.NewFromKeyring(keyring, "")
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if err != nil {
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return nil, err
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}
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return verifyPluginTarball(pluginPath, provFile, sig)
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}
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// verifyPluginTarball verifies a plugin tarball against its signature
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func verifyPluginTarball(pluginPath, provPath string, sig *provenance.Signatory) (*provenance.Verification, error) {
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// Reuse chart verification logic from pkg/provenance
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return sig.Verify(pluginPath, provPath)
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}
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// isTarball checks if a file has a tarball extension
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func isTarball(filename string) bool {
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return filepath.Ext(filename) == ".gz" || filepath.Ext(filename) == ".tgz"
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}
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