| // Copyright IBM Corp. 2014, 2026 |
| // SPDX-License-Identifier: BUSL-1.1 |
| |
| package releaseauth |
| |
| import ( |
| "bytes" |
| "errors" |
| "fmt" |
| "log" |
| "strings" |
| |
| "github.com/ProtonMail/go-crypto/openpgp" |
| openpgpErrors "github.com/ProtonMail/go-crypto/openpgp/errors" |
| ) |
| |
| // SignatureAuthentication is an archive Authenticator that validates that SHA256SUMS data |
| // was signed by the given signing key. |
| type SignatureAuthentication struct { |
| Authenticator |
| |
| // This can be overridden by tests to check arbitrary keys, rather than the HashiCorp public key |
| PublicKey string |
| signature []byte |
| signed []byte |
| } |
| |
| var _ Authenticator = SignatureAuthentication{} |
| |
| // ErrNotSignedByHashiCorp is the error returned when there is a mismatch between the SHA256SUMS |
| // signature data and the data itself. |
| var ErrNotSignedByHashiCorp = errors.New("failed to authenticate that the archive was signed by HashiCorp") |
| |
| // NewSignatureAuthentication creates a new Authenticator given some signature data |
| // (the SHA256SUMS.sig file), the signed data (the SHA256SUMS file), and a public key |
| func NewSignatureAuthentication(signature []byte, signed []byte) *SignatureAuthentication { |
| return &SignatureAuthentication{ |
| signature: signature, |
| signed: signed, |
| PublicKey: HashiCorpPublicKey, |
| } |
| } |
| |
| func (a SignatureAuthentication) Authenticate() error { |
| // Verify the signature using the HashiCorp public key. If this succeeds, |
| // this is an official provider. |
| hashicorpKeyring, err := openpgp.ReadArmoredKeyRing(strings.NewReader(a.PublicKey)) |
| if err != nil { |
| return fmt.Errorf("error creating HashiCorp keyring: %s", err) |
| } |
| |
| entity, err := openpgp.CheckDetachedSignature(hashicorpKeyring, bytes.NewReader(a.signed), bytes.NewReader(a.signature), nil) |
| if err == openpgpErrors.ErrKeyExpired { |
| for id := range entity.Identities { |
| log.Printf("[WARN] expired openpgp key from %s\n", id) |
| } |
| err = nil |
| } |
| if err != nil { |
| log.Printf("[DEBUG] GPG reported an error while verifying detached signature: %s", err) |
| return ErrNotSignedByHashiCorp |
| } |
| |
| return nil |
| } |
| |
| // HashicorpPublicKey is the HashiCorp public key, also available at |
| // https://www.hashicorp.com/.well-known/pgp-key.txt |
| // |
| // Expired key must be replaced, not appended. Signatures are assumed to |
| // not expire and remain verifiable with new key with extended expiry |
| // via github.com/ProtonMail/go-crypto/openpgp. |
| const HashiCorpPublicKeyID = "72D7468F" |
| const HashiCorpPublicKey = `-----BEGIN PGP PUBLIC KEY BLOCK----- |
| |
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| =wtp+ |
| -----END PGP PUBLIC KEY BLOCK-----` |
