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* fix!: ECDSA verifiers now expect PEM-encoded public keys per TUF sp…
…ecification * feat: ECDSA signers are now implemented * feat: RSA verifiers and signers are implemented BREAKING CHANGE: ECDSA verifiers expect PEM-encoded public keys. If you rely on previous behavior of hex-encoded public keys for verifiers, then you must import pkg/deprecated/set_ecdsa that will allow a fallback for hex-encoded ECDSA keys. Co-authored-by: Asra Ali <asraa@google.com> Co-authored-by: Toby Bristow <toby.bristow@qush.com> Signed-off-by: Asra Ali <asraa@google.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| package deprecated | ||
|
|
||
| import ( | ||
| "crypto" | ||
| "crypto/elliptic" | ||
| "crypto/rand" | ||
| "crypto/sha256" | ||
| "encoding/json" | ||
| "testing" | ||
|
|
||
| "github.com/secure-systems-lab/go-securesystemslib/cjson" | ||
| repo "github.com/theupdateframework/go-tuf" | ||
| "github.com/theupdateframework/go-tuf/data" | ||
| _ "github.com/theupdateframework/go-tuf/pkg/deprecated/set_ecdsa" | ||
| "github.com/theupdateframework/go-tuf/pkg/keys" | ||
| . "gopkg.in/check.v1" | ||
| ) | ||
|
|
||
| func Test(t *testing.T) { TestingT(t) } | ||
|
|
||
| type RepoSuite struct{} | ||
|
|
||
| var _ = Suite(&RepoSuite{}) | ||
|
|
||
| func genKey(c *C, r *repo.Repo, role string) []string { | ||
| keyids, err := r.GenKey(role) | ||
| c.Assert(err, IsNil) | ||
| c.Assert(len(keyids) > 0, Equals, true) | ||
| return keyids | ||
| } | ||
|
|
||
| // Deprecated ecdsa key support: Support verification against roots that were | ||
| // signed with hex-encoded ecdsa keys. | ||
| func (rs *RepoSuite) TestDeprecatedHexEncodedKeysSucceed(c *C) { | ||
| files := map[string][]byte{"foo.txt": []byte("foo")} | ||
| local := repo.MemoryStore(make(map[string]json.RawMessage), files) | ||
| r, err := repo.NewRepo(local) | ||
| c.Assert(err, IsNil) | ||
|
|
||
| r.Init(false) | ||
| // Add a root key with hex-encoded ecdsa format | ||
| signer, err := keys.GenerateEcdsaKey() | ||
| c.Assert(err, IsNil) | ||
| type deprecatedP256Verifier struct { | ||
| PublicKey data.HexBytes `json:"public"` | ||
| } | ||
| pub := signer.PublicKey | ||
| keyValBytes, err := json.Marshal(&deprecatedP256Verifier{PublicKey: elliptic.Marshal(pub.Curve, pub.X, pub.Y)}) | ||
| c.Assert(err, IsNil) | ||
| publicData := &data.PublicKey{ | ||
| Type: data.KeyTypeECDSA_SHA2_P256, | ||
| Scheme: data.KeySchemeECDSA_SHA2_P256, | ||
| Algorithms: data.HashAlgorithms, | ||
| Value: keyValBytes, | ||
| } | ||
| err = r.AddVerificationKey("root", publicData) | ||
| c.Assert(err, IsNil) | ||
| // Add other keys as normal | ||
| genKey(c, r, "targets") | ||
| genKey(c, r, "snapshot") | ||
| genKey(c, r, "timestamp") | ||
| c.Assert(r.AddTarget("foo.txt", nil), IsNil) | ||
|
|
||
| // Sign the root role manually | ||
| rootMeta, err := r.SignedMeta("root.json") | ||
| c.Assert(err, IsNil) | ||
| rootCanonical, err := cjson.EncodeCanonical(rootMeta.Signed) | ||
| c.Assert(err, IsNil) | ||
| hash := sha256.Sum256(rootCanonical) | ||
| rootSig, err := signer.PrivateKey.Sign(rand.Reader, hash[:], crypto.SHA256) | ||
| c.Assert(err, IsNil) | ||
| for _, id := range publicData.IDs() { | ||
| c.Assert(r.AddOrUpdateSignature("root.json", data.Signature{ | ||
| KeyID: id, | ||
| Signature: rootSig}), IsNil) | ||
| } | ||
|
|
||
| // Committing should succeed because the deprecated key pkg is added. | ||
| c.Assert(r.Snapshot(), IsNil) | ||
| c.Assert(r.Timestamp(), IsNil) | ||
| c.Assert(r.Commit(), IsNil) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| package set_ecdsa | ||
|
|
||
| import ( | ||
| "errors" | ||
|
|
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| "github.com/theupdateframework/go-tuf/data" | ||
| "github.com/theupdateframework/go-tuf/pkg/keys" | ||
| ) | ||
|
|
||
| /* | ||
| Importing this package will allow support for both hex-encoded ECDSA | ||
| verifiers and PEM-encoded ECDSA verifiers. | ||
| Note that this package imports "github.com/theupdateframework/go-tuf/pkg/keys" | ||
| and overrides the ECDSA verifier loaded at init time in that package. | ||
| */ | ||
|
|
||
| func init() { | ||
| _, ok := keys.VerifierMap.Load(data.KeyTypeECDSA_SHA2_P256) | ||
| if !ok { | ||
| panic(errors.New("expected to override previously loaded PEM-only ECDSA verifier")) | ||
| } | ||
| keys.VerifierMap.Store(data.KeyTypeECDSA_SHA2_P256, keys.NewDeprecatedEcdsaVerifier) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package keys | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/ecdsa" | ||
| "crypto/elliptic" | ||
| "crypto/sha256" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/theupdateframework/go-tuf/data" | ||
| ) | ||
|
|
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| func NewDeprecatedEcdsaVerifier() Verifier { | ||
| return &ecdsaVerifierWithDeprecatedSupport{} | ||
| } | ||
|
|
||
| type ecdsaVerifierWithDeprecatedSupport struct { | ||
| key *data.PublicKey | ||
| // This will switch based on whether this is a PEM-encoded key | ||
| // or a deprecated hex-encoded key. | ||
| Verifier | ||
| } | ||
|
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| func (p *ecdsaVerifierWithDeprecatedSupport) UnmarshalPublicKey(key *data.PublicKey) error { | ||
| p.key = key | ||
| pemVerifier := &EcdsaVerifier{} | ||
| if err := pemVerifier.UnmarshalPublicKey(key); err != nil { | ||
| // Try the deprecated hex-encoded verifier | ||
| hexVerifier := &deprecatedP256Verifier{} | ||
| if err := hexVerifier.UnmarshalPublicKey(key); err != nil { | ||
| return err | ||
| } | ||
| p.Verifier = hexVerifier | ||
| return nil | ||
| } | ||
| p.Verifier = pemVerifier | ||
| return nil | ||
| } | ||
|
|
||
| /* | ||
| Deprecated ecdsaVerifier that used hex-encoded public keys. | ||
| This MAY be used to verify existing metadata that used this | ||
| old format. This will be deprecated soon, ensure that repositories | ||
| are re-signed and clients receieve a fully compliant root. | ||
| */ | ||
|
|
||
| type deprecatedP256Verifier struct { | ||
| PublicKey data.HexBytes `json:"public"` | ||
| key *data.PublicKey | ||
| } | ||
|
|
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| func (p *deprecatedP256Verifier) Public() string { | ||
| return p.PublicKey.String() | ||
| } | ||
|
|
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| func (p *deprecatedP256Verifier) Verify(msg, sigBytes []byte) error { | ||
| x, y := elliptic.Unmarshal(elliptic.P256(), p.PublicKey) | ||
| k := &ecdsa.PublicKey{ | ||
| Curve: elliptic.P256(), | ||
| X: x, | ||
| Y: y, | ||
| } | ||
|
|
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| hash := sha256.Sum256(msg) | ||
|
|
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| if !ecdsa.VerifyASN1(k, hash[:], sigBytes) { | ||
| return errors.New("tuf: deprecated ecdsa signature verification failed") | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (p *deprecatedP256Verifier) MarshalPublicKey() *data.PublicKey { | ||
| return p.key | ||
| } | ||
|
|
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| func (p *deprecatedP256Verifier) UnmarshalPublicKey(key *data.PublicKey) error { | ||
| // Prepare decoder limited to 512Kb | ||
| dec := json.NewDecoder(io.LimitReader(bytes.NewReader(key.Value), MaxJSONKeySize)) | ||
|
|
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| // Unmarshal key value | ||
| if err := dec.Decode(p); err != nil { | ||
| if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) { | ||
| return fmt.Errorf("tuf: the public key is truncated or too large: %w", err) | ||
| } | ||
| return err | ||
| } | ||
|
|
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| curve := elliptic.P256() | ||
|
|
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| // Parse as uncompressed marshalled point. | ||
| x, _ := elliptic.Unmarshal(curve, p.PublicKey) | ||
| if x == nil { | ||
| return errors.New("tuf: invalid ecdsa public key point") | ||
| } | ||
|
|
||
| p.key = key | ||
| fmt.Fprintln(os.Stderr, "tuf: warning using deprecated ecdsa hex-encoded keys") | ||
| return nil | ||
| } |
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