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This adds support for using encrypted Tink keysets to load a signer. There are two main benefits from this work: We can leverage this instead of KMS if we need to support a higher QPS, and Tink keysets use strong secure defaults. Keysets can be encrypted with AESGCM, do not rely on a KDF, cannot be brute-forced, and access to the key can be audited through cloud audit logs. Tink does not provide a method to extract the signing key from the keyset intentionally, so I wrote a helper library to reach into the key handle proto to construct a crypto.Signer. Signed-off-by: Hayden Blauzvern <hblauzvern@google.com>
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| // Copyright 2022 The Sigstore Authors. | ||
| // | ||
| // 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. | ||
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| package main | ||
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| import ( | ||
| "flag" | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
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| "github.com/google/tink/go/keyset" | ||
| "github.com/google/tink/go/signature" | ||
| "github.com/sigstore/fulcio/pkg/ca/tinkca" | ||
| ) | ||
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| /* | ||
| To run: | ||
| go run cmd/create_tink_keyset/create_tink_keyset.go \ | ||
| --kms-resource="gcp-kms://projects/<project>/locations/<region>/keyRings/<key-ring>/cryptoKeys/<key>" \ | ||
| --output="enc-keyset.cfg" | ||
| You can also create a GCP KMS encrypted Tink keyset with tinkey: | ||
| tinkey create-keyset --key-template ECDSA_P384 --out enc-keyset.cfg --master-key-uri gcp-kms://projects/<project>/locations/<region>/keyRings/<key-ring>/cryptoKeys/<key> | ||
| You must have the permissions to read the KMS key, and create a certificate in the CA pool. | ||
| */ | ||
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| var ( | ||
| kmsKey = flag.String("kms-resource", "", "Resource path to KMS key, starting with gcp-kms:// or aws-kms://") | ||
| outputPath = flag.String("output", "", "Path to the output file") | ||
| ) | ||
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| func main() { | ||
| flag.Parse() | ||
| if *kmsKey == "" { | ||
| log.Fatal("kms-resource must be set") | ||
| } | ||
| if *outputPath == "" { | ||
| log.Fatal("output must be set") | ||
| } | ||
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| kh, err := keyset.NewHandle(signature.ECDSAP384KeyWithoutPrefixTemplate()) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| primaryKey, err := tinkca.GetPrimaryKey(*kmsKey) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| f, err := os.Create(*outputPath) | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| defer f.Close() | ||
| jsonWriter := keyset.NewJSONWriter(f) | ||
| if err := kh.Write(jsonWriter, primaryKey); err != nil { | ||
| fmt.Printf("error writing primary key: %v\n", err) | ||
| } | ||
| } |
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