1 files changed, 142 insertions, 0 deletions
diff --git a/certService/src/main/java/org/onap/oom/certservice/cmpv2client/validation/CmpCertificationValidator.java b/certService/src/main/java/org/onap/oom/certservice/cmpv2client/validation/CmpCertificationValidator.java
new file mode 100644
index 00000000..40a2a1d9
--- /dev/null
+++ b/certService/src/main/java/org/onap/oom/certservice/cmpv2client/validation/CmpCertificationValidator.java
@@ -0,0 +1,142 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2020 Nordix Foundation.
+ * ================================================================================
+ * Modification copyright 2021 Nokia
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.oom.certservice.cmpv2client.validation;
+
+import static org.onap.oom.certservice.cmpv2client.impl.CmpResponseValidationHelper.checkImplicitConfirm;
+import static org.onap.oom.certservice.cmpv2client.impl.CmpResponseValidationHelper.verifyPasswordBasedProtection;
+import static org.onap.oom.certservice.cmpv2client.impl.CmpResponseValidationHelper.verifySignature;
+
+import java.security.PublicKey;
+import java.util.Date;
+import java.util.Objects;
+import java.util.Optional;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.bouncycastle.asn1.ASN1ObjectIdentifier;
+import org.bouncycastle.asn1.cmp.CertResponse;
+import org.bouncycastle.asn1.cmp.PKIHeader;
+import org.bouncycastle.asn1.cmp.PKIMessage;
+import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
+import org.onap.oom.certservice.certification.configuration.model.CaMode;
+import org.onap.oom.certservice.certification.configuration.model.Cmpv2Server;
+import org.onap.oom.certservice.certification.model.CsrModel;
+import org.onap.oom.certservice.cmpv2client.exceptions.CmpClientException;
+import org.onap.oom.certservice.cmpv2client.exceptions.CmpServerException;
+import org.onap.oom.certservice.cmpv2client.impl.CmpUtil;
+import org.onap.oom.certservice.cmpv2client.impl.PkiStatus;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CmpCertificationValidator {
+    private static final String DEFAULT_CA_NAME = "Certification Authority";
+    private static final String DEFAULT_PROFILE = CaMode.RA.getProfile();
+    private static final ASN1ObjectIdentifier PASSWORD_BASED_MAC = new ASN1ObjectIdentifier("1.2.840.113533.7.66.13");
+    private static final Logger LOG = LoggerFactory.getLogger(CmpCertificationValidator.class);
+
+    public static void validate(
+        final CsrModel csrModel,
+        final Cmpv2Server server,
+        final CloseableHttpClient httpClient,
+        final Date notBefore,
+        final Date notAfter) {
+
+        String caName = CmpUtil.isNullOrEmpty(server.getCaName()) ? server.getCaName() : DEFAULT_CA_NAME;
+        String profile = server.getCaMode() != null ? server.getCaMode().getProfile() : DEFAULT_PROFILE;
+        LOG.info(
+            "Validate before creating Certificate Request for CA :{} in Mode {} ", caName, profile);
+
+        CmpUtil.notNull(csrModel, "CsrModel Instance");
+        CmpUtil.notNull(csrModel.getSubjectData(), "Subject DN");
+        CmpUtil.notNull(csrModel.getPrivateKey(), "Subject private key");
+        CmpUtil.notNull(csrModel.getPublicKey(), "Subject public key");
+        CmpUtil.notNull(server.getIssuerDN(), "Issuer DN");
+        CmpUtil.notNull(server.getUrl(), "External CA URL");
+        CmpUtil.notNull(server.getAuthentication().getIak(), "IAK/RV Password");
+        CmpUtil.notNull(httpClient, "Closeable Http Client");
+
+        if (notBefore != null && notAfter != null && notBefore.compareTo(notAfter) > 0) {
+            throw new IllegalArgumentException("Before Date is set after the After Date");
+        }
+    }
+
+    public void checkCmpResponse(final PKIMessage respPkiMessage, final PublicKey publicKey, final String initAuthPassword)
+        throws CmpClientException {
+        final PKIHeader header = respPkiMessage.getHeader();
+        final AlgorithmIdentifier protectionAlgo = header.getProtectionAlg();
+        verifySignatureWithPublicKey(respPkiMessage, publicKey);
+        if (isPasswordBasedMacAlgorithm(protectionAlgo)) {
+            LOG.info("CMP response is protected by Password Base Mac Algorithm. Attempt to verify protection");
+            verifyPasswordBasedMacProtection(respPkiMessage, initAuthPassword, header, protectionAlgo);
+        }
+    }
+
+    public void checkServerResponse(CertResponse certResponse) {
+        if (certResponse.getStatus() != null && certResponse.getStatus().getStatus() != null) {
+            logServerResponse(certResponse);
+            if (certResponse.getStatus().getStatus().intValue() == PkiStatus.REJECTED.getCode()) {
+                String serverMessage = certResponse.getStatus().getStatusString().getStringAt(0).getString();
+                throw new CmpServerException(Optional.ofNullable(serverMessage).orElse("N/A"));
+            }
+        }
+    }
+
+    private boolean isPasswordBasedMacAlgorithm(AlgorithmIdentifier protectionAlgo) throws CmpClientException {
+        if (Objects.isNull(protectionAlgo)) {
+            LOG.error("CMP response does not contain Protection Algorithm field");
+            throw new CmpClientException("CMP response does not contain Protection Algorithm field");
+        }
+        return PASSWORD_BASED_MAC.equals(protectionAlgo.getAlgorithm());
+    }
+
+    private void verifySignatureWithPublicKey(PKIMessage respPkiMessage, PublicKey publicKey)
+        throws CmpClientException {
+        if (Objects.nonNull(publicKey)) {
+            LOG.debug("Verifying signature of the response.");
+            verifySignature(respPkiMessage, publicKey);
+        } else {
+            LOG.error("Public Key is not available, therefore cannot verify signature");
+            throw new CmpClientException(
+                "Public Key is not available, therefore cannot verify signature");
+        }
+    }
+
+    private void verifyPasswordBasedMacProtection(PKIMessage respPkiMessage, String initAuthPassword,
+        PKIHeader header, AlgorithmIdentifier protectionAlgo)
+        throws CmpClientException {
+        LOG.debug("Verifying PasswordBased Protection of the Response.");
+        verifyPasswordBasedProtection(respPkiMessage, initAuthPassword, protectionAlgo);
+        checkImplicitConfirm(header);
+    }
+
+    private void logServerResponse(CertResponse certResponse) {
+        if (LOG.isInfoEnabled()) {
+            LOG.info("Response status code: {}", certResponse.getStatus().getStatus());
+        }
+        if (certResponse.getStatus().getStatusString() != null) {
+            String serverMessage = certResponse.getStatus().getStatusString().getStringAt(0).getString();
+            LOG.warn("Response status text: {}", serverMessage);
+        }
+        if (LOG.isWarnEnabled() && certResponse.getStatus().getFailInfo() != null) {
+            LOG.warn("Response fail info:   {}", certResponse.getStatus().getFailInfo());
+        }
+    }
+}