mirror of
https://github.com/ddworken/hishtory.git
synced 2024-11-23 08:45:16 +01:00
125 lines
3.6 KiB
Go
125 lines
3.6 KiB
Go
package lib
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import (
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"context"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"github.com/ddworken/hishtory/client/vndor/slsa_verifier"
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"github.com/sigstore/cosign/cmd/cosign/cli/rekor"
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)
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var defaultRekorAddr = "https://rekor.sigstore.dev"
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// Verify SLSA provenance of the downloaded binary
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// Copied from https://github.com/slsa-framework/slsa-verifier/blob/aee753f/main.go
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// Once the slsa-verifier supports being used as a library, this can be removed
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func verify(provenance []byte, artifactHash, source, branch, versionTag string) error {
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rClient, err := rekor.NewClient(defaultRekorAddr)
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if err != nil {
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return err
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}
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// Get Rekor entries corresponding to the binary artifact in the provenance.
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uuids, err := slsa_verifier.GetRekorEntries(rClient, artifactHash)
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if err != nil {
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return err
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}
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env, err := slsa_verifier.EnvelopeFromBytes(provenance)
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if err != nil {
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return err
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}
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// Verify the provenance and return the signing certificate.
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cert, err := slsa_verifier.FindSigningCertificate(context.Background(), uuids, *env, rClient)
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if err != nil {
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return fmt.Errorf("failed to locate signing certificate: %v", err)
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}
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// Get the workflow info given the certificate information.
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workflowInfo, err := slsa_verifier.GetWorkflowInfoFromCertificate(cert)
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if err != nil {
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return fmt.Errorf("failed to verify workflow info: %v", err)
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}
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// Unpack and verify info in the provenance, including the Subject Digest.
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if err := slsa_verifier.VerifyProvenance(env, artifactHash); err != nil {
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return fmt.Errorf("failed to verify provenance: %v", err)
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}
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// Verify the workflow identity.
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if err := slsa_verifier.VerifyWorkflowIdentity(workflowInfo, source); err != nil {
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return fmt.Errorf("failed to verify workflow identity: %v", err)
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}
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// Verify the branch.
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if err := slsa_verifier.VerifyBranch(env, branch); err != nil {
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return err
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}
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// Verify the tag.
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if err := slsa_verifier.VerifyTag(env, versionTag); err != nil {
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return fmt.Errorf("failed to verify tag: %v", err)
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}
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return nil
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}
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func checkForDowngrade(currentVersionS, newVersionS string) error {
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currentVersion, err := strconv.Atoi(strings.TrimPrefix(currentVersionS, "v0."))
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if err != nil {
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return fmt.Errorf("failed to parse current version %#v", currentVersionS)
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}
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newVersion, err := strconv.Atoi(strings.TrimPrefix(newVersionS, "v0."))
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if err != nil {
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return fmt.Errorf("failed to parse updated version %#v", newVersionS)
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}
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if currentVersion > newVersion {
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return fmt.Errorf("failed to update because the new version (%#v) is a downgrade compared to the current version (%#v)", newVersionS, currentVersionS)
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}
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return nil
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}
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func verifyBinary(binaryPath, attestationPath, versionTag string) error {
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if os.Getenv("HISHTORY_DISABLE_SLSA_ATTESTATION") == "true" {
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return nil
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}
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if err := checkForDowngrade(Version, versionTag); err != nil && os.Getenv("HISHTORY_ALLOW_DOWNGRADE") == "true" {
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return err
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}
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attestation, err := os.ReadFile(attestationPath)
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if err != nil {
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return fmt.Errorf("failed to read attestation file: %v", err)
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}
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hash, err := getFileHash(binaryPath)
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if err != nil {
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return err
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}
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return verify(attestation, hash, "github.com/ddworken/hishtory", "master", versionTag)
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}
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func getFileHash(binaryPath string) (string, error) {
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binaryFile, err := os.Open(binaryPath)
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if err != nil {
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return "", fmt.Errorf("failed to read binary for verification purposes: %v", err)
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}
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defer binaryFile.Close()
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hasher := sha256.New()
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if _, err := io.Copy(hasher, binaryFile); err != nil {
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return "", fmt.Errorf("failed to hash binary: %v", err)
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}
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hash := hex.EncodeToString(hasher.Sum(nil))
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return hash, nil
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}
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