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- Rename CertificateResponse to SigningCertificate - SCTs are optional - Add more testing around parsing - Add example fulcio/ctfe public keys and sct/cert examples for testing - Exceptions are still kinda just passed along Signed-off-by: Appu Goundan <appu@google.com> Co-authored-by: Vladimir Sitnikov <sitnikov.vladimir@gmail.com>
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src/main/java/dev/sigstore/fulcio/client/CertificateRequests.java
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src/main/java/dev/sigstore/fulcio/client/FulcioValidator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| package dev.sigstore.fulcio.client; | ||
|
|
||
| import com.google.api.client.util.PemReader; | ||
| import java.io.ByteArrayInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStreamReader; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.security.InvalidAlgorithmParameterException; | ||
| import java.security.KeyFactory; | ||
| import java.security.NoSuchAlgorithmException; | ||
| import java.security.PublicKey; | ||
| import java.security.cert.*; | ||
| import java.security.spec.EncodedKeySpec; | ||
| import java.security.spec.InvalidKeySpecException; | ||
| import java.security.spec.X509EncodedKeySpec; | ||
| import java.util.Collections; | ||
| import java.util.Date; | ||
| import org.checkerframework.checker.nullness.qual.Nullable; | ||
| import org.conscrypt.ct.CTLogInfo; | ||
| import org.conscrypt.ct.CertificateEntry; | ||
| import org.conscrypt.ct.SignedCertificateTimestamp; | ||
| import org.conscrypt.ct.VerifiedSCT; | ||
|
|
||
| public class FulcioValidator { | ||
| @Nullable private final CTLogInfo ctLogInfo; | ||
| private final TrustAnchor fulcioRoot; | ||
|
|
||
| public static FulcioValidator newFulcioValidator( | ||
| byte[] fulcioRoot, @Nullable byte[] ctfePublicKey) | ||
| throws InvalidKeySpecException, NoSuchAlgorithmException, CertificateException, IOException, | ||
| InvalidAlgorithmParameterException { | ||
|
|
||
| CTLogInfo ctLogInfo = null; | ||
| if (ctfePublicKey != null) { | ||
| // TODO: ctfePublicKey can be EC or RSA or EDDSA/ED25519 | ||
| // (https://github.com/sigstore/sigstore-java/issues/4) | ||
| KeyFactory keyFactory = KeyFactory.getInstance("EC"); | ||
| PemReader pemReader = | ||
| new PemReader( | ||
| new InputStreamReader( | ||
| new ByteArrayInputStream(ctfePublicKey), StandardCharsets.UTF_8)); | ||
| PemReader.Section section = pemReader.readNextSection(); | ||
| if (pemReader.readNextSection() != null) { | ||
| throw new InvalidKeySpecException( | ||
| "ctfe public key must be only a single PEM encoded public key"); | ||
| } | ||
| EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(section.getBase64DecodedBytes()); | ||
| PublicKey ctfePublicKeyObj = keyFactory.generatePublic(publicKeySpec); | ||
| ctLogInfo = new CTLogInfo(ctfePublicKeyObj, "fulcio ct log", "unused-url"); | ||
| } | ||
|
|
||
| CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509"); | ||
| X509Certificate fulcioRootObj = | ||
| (X509Certificate) | ||
| certificateFactory.generateCertificate(new ByteArrayInputStream(fulcioRoot)); | ||
|
|
||
| TrustAnchor fulcioRootTrustAnchor = new TrustAnchor(fulcioRootObj, null); | ||
| // this should throw an InvalidAlgorithmException a bit earlier that would otherwise be | ||
| // encountered | ||
| // in validateCertPath | ||
| new PKIXParameters(Collections.singleton(fulcioRootTrustAnchor)); | ||
|
|
||
| return new FulcioValidator(ctLogInfo, fulcioRootTrustAnchor); | ||
| } | ||
|
|
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| private FulcioValidator(@Nullable CTLogInfo ctLogInfo, TrustAnchor fulcioRoot) { | ||
| this.ctLogInfo = ctLogInfo; | ||
| this.fulcioRoot = fulcioRoot; | ||
| } | ||
|
|
||
| public void validateSct(SigningCertificate sc) throws FulcioValidationException { | ||
|
|
||
| SignedCertificateTimestamp sct = | ||
| sc.getSct() | ||
| .orElseThrow(() -> new FulcioValidationException("No SCT was found to validate")); | ||
| if (ctLogInfo == null) { | ||
| throw new FulcioValidationException("No ct-log public key was provided to validator"); | ||
| } | ||
|
|
||
| // leaf certificate are guaranteed to be X509Certificates if they were built via | ||
| // a client request. | ||
| if (!(sc.getLeafCertificate() instanceof X509Certificate)) { | ||
| throw new RuntimeException( | ||
| "Encountered non X509 Certificate when validating SCT. Leaf certificate is " | ||
| + sc.getLeafCertificate().getClass()); | ||
| } | ||
| CertificateEntry ce; | ||
|
|
||
| try { | ||
| ce = CertificateEntry.createForX509Certificate((X509Certificate) sc.getLeafCertificate()); | ||
| } catch (CertificateEncodingException cee) { | ||
| throw new FulcioValidationException("Leaf certificate could not be parsed", cee); | ||
| } | ||
|
|
||
| VerifiedSCT.Status status = ctLogInfo.verifySingleSCT(sct, ce); | ||
| if (status != VerifiedSCT.Status.VALID) { | ||
| throw new FulcioValidationException("SCT could not be verified because " + status.toString()); | ||
| } | ||
| } | ||
|
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||
| public void validateCertChain(SigningCertificate sc) throws FulcioValidationException { | ||
| CertPathValidator cpv; | ||
| try { | ||
| cpv = CertPathValidator.getInstance("PKIX"); | ||
| } catch (NoSuchAlgorithmException e) { | ||
| // | ||
| throw new RuntimeException( | ||
| "No PKIX CertPathValidator, we probably shouldn't be here, but this seems to be a system library error not a program control flow issue", | ||
| e); | ||
| } | ||
|
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| PKIXParameters pkixParams; | ||
| try { | ||
| pkixParams = new PKIXParameters(Collections.singleton(fulcioRoot)); | ||
| } catch (InvalidAlgorithmParameterException e) { | ||
| throw new RuntimeException( | ||
| "Can't create PKIX parameters for fulcioRoot. This should have been checked when generating a validator instance", | ||
| e); | ||
| } | ||
| pkixParams.setRevocationEnabled(false); | ||
|
|
||
| // these certs are only valid for 15 minutes, so find a time in the validity period | ||
| Date dateInValidityPeriod = | ||
| new Date(((X509Certificate) sc.getLeafCertificate()).getNotBefore().getTime()); | ||
| pkixParams.setDate(dateInValidityPeriod); | ||
|
|
||
| try { | ||
| // a result is returned here, but I don't know what to do with it yet | ||
| cpv.validate(sc.getCertPath(), pkixParams); | ||
| } catch (CertPathValidatorException | InvalidAlgorithmParameterException ve) { | ||
| throw new FulcioValidationException(ve); | ||
| } | ||
| } | ||
| } |
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