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Signed-off-by: chaosinthecrd <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| // Copyright 2023 The Witness Contributors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // Package aws implement the interface with amazon aws kms service | ||
| package aws | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "crypto" | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "time" | ||
|
|
||
| akms "github.com/aws/aws-sdk-go-v2/service/kms" | ||
| "github.com/aws/aws-sdk-go-v2/service/kms/types" | ||
| "github.com/in-toto/go-witness/cryptoutil" | ||
| "github.com/in-toto/go-witness/signer/kms" | ||
| ttlcache "github.com/jellydator/ttlcache/v3" | ||
| ) | ||
|
|
||
| var ( | ||
| aid = "012345678901" | ||
| arn = "arn:aws:kms:us-west-2:012345678901:key/12345678-1234-1234-1234-123456789012" | ||
| ) | ||
|
|
||
| func createRsaKey() (*rsa.PrivateKey, *rsa.PublicKey, error) { | ||
| privKey, err := rsa.GenerateKey(rand.Reader, 2048) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| return privKey, &privKey.PublicKey, nil | ||
| } | ||
|
|
||
| func createTestKey() (cryptoutil.Signer, cryptoutil.Verifier, error) { | ||
| privKey, pubKey, err := createRsaKey() | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| signer := cryptoutil.NewRSASigner(privKey, crypto.SHA256) | ||
| verifier := cryptoutil.NewRSAVerifier(pubKey, crypto.SHA256) | ||
| return signer, verifier, nil | ||
| } | ||
|
|
||
| type fakeAWSClient struct { | ||
| client *akms.Client | ||
| endpoint string | ||
| keyID string | ||
| alias string | ||
| keyCache *ttlcache.Cache[string, cmk] | ||
| privateKey *rsa.PrivateKey | ||
| hash crypto.Hash | ||
| } | ||
|
|
||
| func newFakeAWSClient(ctx context.Context, ksp *kms.KMSSignerProvider) (*fakeAWSClient, error) { | ||
| a, err := newAWSClient(ctx, ksp) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| c := &fakeAWSClient{ | ||
| client: a.client, | ||
| endpoint: a.endpoint, | ||
| keyID: a.keyID, | ||
| alias: a.alias, | ||
| keyCache: a.keyCache, | ||
| hash: ksp.HashFunc, | ||
| } | ||
|
|
||
| return c, nil | ||
| } | ||
|
|
||
| func (a *fakeAWSClient) fetchCMK(ctx context.Context) (*cmk, error) { | ||
| var err error | ||
| cmk := &cmk{} | ||
| cmk.PublicKey, err = a.fetchPublicKey(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| cmk.KeyMetadata, err = a.fetchKeyMetadata(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return cmk, nil | ||
| } | ||
|
|
||
| func (a *fakeAWSClient) getHashFunc(ctx context.Context) (crypto.Hash, error) { | ||
| cmk, err := a.getCMK(ctx) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| return cmk.HashFunc(), nil | ||
| } | ||
|
|
||
| func (a *fakeAWSClient) getCMK(ctx context.Context) (*cmk, error) { | ||
| var lerr error | ||
| loader := ttlcache.LoaderFunc[string, cmk]( | ||
| func(c *ttlcache.Cache[string, cmk], key string) *ttlcache.Item[string, cmk] { | ||
| var k *cmk | ||
| k, lerr = a.fetchCMK(ctx) | ||
| if lerr == nil { | ||
| return c.Set(cacheKey, *k, time.Second*300) | ||
| } | ||
| return nil | ||
| }, | ||
| ) | ||
|
|
||
| item := a.keyCache.Get(cacheKey, ttlcache.WithLoader[string, cmk](loader)) | ||
| if lerr == nil { | ||
| cmk := item.Value() | ||
| return &cmk, nil | ||
| } | ||
| return nil, lerr | ||
| } | ||
|
|
||
| // At the moment this function lies unused, but it is here for future if necessary | ||
|
|
||
| func (a *fakeAWSClient) verifyRemotely(ctx context.Context, sig, digest []byte) error { | ||
| c, err := a.getCMK(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| v, err := cryptoutil.NewVerifier(c.PublicKey, cryptoutil.VerifyWithHash(a.hash)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return v.Verify(bytes.NewReader(digest), sig) | ||
| } | ||
|
|
||
| func (a *fakeAWSClient) sign(ctx context.Context, digest []byte, _ crypto.Hash) ([]byte, error) { | ||
| _, err := a.getCMK(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| signer, err := cryptoutil.NewSigner(a.privateKey, cryptoutil.SignWithHash(a.hash)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| s, err := signer.Sign(bytes.NewReader(digest)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return s, nil | ||
| } | ||
|
|
||
| func (a *fakeAWSClient) fetchPublicKey(ctx context.Context) (crypto.PublicKey, error) { | ||
| k, p, err := createRsaKey() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| a.privateKey = k | ||
|
|
||
| return p, nil | ||
| } | ||
|
|
||
| func (a *fakeAWSClient) fetchKeyMetadata(ctx context.Context) (*types.KeyMetadata, error) { | ||
| km := &types.KeyMetadata{ | ||
| KeyId: &a.keyID, | ||
| AWSAccountId: &aid, | ||
| Arn: &arn, | ||
| } | ||
|
|
||
| return km, nil | ||
| } |
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