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Merge pull request #90 from gmacf/cms
Return Owner Cert as a CMS structure instead of PEM encoding
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // Copyright 2023 Google LLC | ||
| // | ||
| // 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 | ||
| // | ||
| // https://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 ownercertificate provides helper functions for generating, parsing and verifying owner certs. | ||
| package ownercertificate | ||
|
|
||
| import ( | ||
| "crypto" | ||
| "crypto/x509" | ||
| "fmt" | ||
|
|
||
| "go.mozilla.org/pkcs7" | ||
| ) | ||
|
|
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| // Verify checks that the provided CMS value is signed by a signer in the provided | ||
| // certPool and returns the Ownership Certificate. | ||
| func Verify(in []byte, certPool *x509.CertPool) (*x509.Certificate, error) { | ||
| if len(in) == 0 { | ||
| return nil, fmt.Errorf("owner certificate is empty") | ||
| } | ||
| p7, err := pkcs7.Parse(in) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to parse into pkcs7 format: %v", err) | ||
| } | ||
| if err = p7.VerifyWithChain(certPool); err != nil { | ||
| return nil, fmt.Errorf("failed to verify OC: %v", err) | ||
| } | ||
| if len(p7.Certificates) == 0 { | ||
| return nil, fmt.Errorf("no certificates found in pkcs7 message") | ||
| } | ||
| return p7.Certificates[0], nil | ||
| } | ||
|
|
||
| // GenerateCMS takes an Ownership Certificate keypair and converts it to a CMS structure. | ||
| // The CMS structure contains the Ownership Certificate in its list of certificates. | ||
| func GenerateCMS(cert *x509.Certificate, priv crypto.PrivateKey) ([]byte, error) { | ||
| signedMessage, err := pkcs7.NewSignedData(nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| signedMessage.SetDigestAlgorithm(pkcs7.OIDDigestAlgorithmSHA256) | ||
| signedMessage.SetEncryptionAlgorithm(pkcs7.OIDEncryptionAlgorithmRSA) | ||
| signedMessage.AddCertificate(cert) | ||
|
|
||
| err = signedMessage.AddSigner(cert, priv, pkcs7.SignerInfoConfig{}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return signedMessage.Finish() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| // Copyright 2023 Google LLC | ||
| // | ||
| // 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 | ||
| // | ||
| // https://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 ownercertificate | ||
|
|
||
| import ( | ||
| "crypto/x509" | ||
| "testing" | ||
|
|
||
| _ "embed" | ||
|
|
||
| artifacts "github.com/openconfig/bootz/testdata" | ||
| ) | ||
|
|
||
| // Tests that the CMS structure can be created and that it can be verified with a PDC. | ||
| func TestGenerateAndVerify(t *testing.T) { | ||
| pdc, pdcPrivateKey, err := artifacts.NewCertificateAuthority("Pinned Domain Cert", "Google", "localhost") | ||
| if err != nil { | ||
| t.Fatalf("NewCertificateAuthority(): %v", err) | ||
| } | ||
| oc, ocPrivateKey, err := artifacts.NewSignedCertificate("Owner Certificate", "Google", "localhost", pdc, pdcPrivateKey) | ||
| if err != nil { | ||
| t.Fatalf("NewSignedCertificate(): %v", err) | ||
| } | ||
| cms, err := GenerateCMS(oc, ocPrivateKey) | ||
| if err != nil { | ||
| t.Fatalf("GenerateCMS(): %v", err) | ||
| } | ||
| pdcPool := x509.NewCertPool() | ||
| pdcPool.AddCert(pdc) | ||
| _, err = Verify(cms, pdcPool) | ||
| if err != nil { | ||
| t.Fatalf("Verify(): %v", err) | ||
| } | ||
| } |
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