Add tenant based storing and loading SCEP certificates

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/CertificateDAO.java

@@ -51,6 +51,16 @@ public interface CertificateDAO {
      */
     CertificateResponse retrieveCertificate(String serialNumber) throws CertificateManagementDAOException;
 
+    /**
+     * Obtain a certificated stored in the database by providing the common name and the tenant ID
+     *
+     * @param serialNumber Serial number (Common name) of the certificate
+     * @param tenantId ID of the certificate owning tenant
+     * @return representation of the certificate.
+     * @throws CertificateManagementDAOException if fails to read the certificate from the database
+     */
+    CertificateResponse retrieveCertificate(String serialNumber, int tenantId) throws CertificateManagementDAOException;
+
     /**
      * Get all the certificates in a paginated manner.
      *

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/dao/impl/AbstractCertificateDAOImpl.java

@@ -119,6 +119,42 @@ public abstract class AbstractCertificateDAOImpl implements CertificateDAO{
         return certificateResponse;
     }
 
+    @Override
+    public CertificateResponse retrieveCertificate(String serialNumber, int tenantId) throws CertificateManagementDAOException {
+        Connection conn;
+        PreparedStatement stmt = null;
+        ResultSet resultSet = null;
+        CertificateResponse certificateResponse = null;
+        try {
+            conn = this.getConnection();
+            String query =
+                    "SELECT CERTIFICATE, SERIAL_NUMBER, TENANT_ID, USERNAME FROM"
+                            + " DM_DEVICE_CERTIFICATE WHERE SERIAL_NUMBER = ? AND TENANT_ID = ? ";
+            stmt = conn.prepareStatement(query);
+            stmt.setString(1, serialNumber);
+            stmt.setInt(2, tenantId);
+            resultSet = stmt.executeQuery();
+
+            if (resultSet.next()) {
+                certificateResponse = new CertificateResponse();
+                byte[] certificateBytes = resultSet.getBytes("CERTIFICATE");
+                certificateResponse.setCertificate(certificateBytes);
+                certificateResponse.setSerialNumber(resultSet.getString("SERIAL_NUMBER"));
+                certificateResponse.setTenantId(resultSet.getInt("TENANT_ID"));
+                certificateResponse.setUsername(resultSet.getString("USERNAME"));
+                CertificateGenerator.extractCertificateDetails(certificateBytes, certificateResponse);
+            }
+        } catch (SQLException e) {
+            String errorMsg =
+                    "Unable to get the read the certificate with serial" + serialNumber;
+            log.error(errorMsg, e);
+            throw new CertificateManagementDAOException(errorMsg, e);
+        } finally {
+            CertificateManagementDAOUtil.cleanupResources(stmt, resultSet);
+        }
+        return certificateResponse;
+    }
+
     @Override
     public List<CertificateResponse> searchCertificate(String serialNumber)
             throws CertificateManagementDAOException {

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/impl/CertificateGenerator.java

@@ -376,15 +376,31 @@ public class CertificateGenerator {
         CertificateResponse lookUpCertificate = null;
         KeyStoreReader keyStoreReader = new KeyStoreReader();
         if (distinguishedName != null && !distinguishedName.isEmpty()) {
-            if (distinguishedName.contains("/CN=")) {
-                String[] dnSplits = distinguishedName.split("/");
-                for (String dnPart : dnSplits) {
-                    if (dnPart.contains("CN=")) {
-                        String commonNameExtracted = dnPart.replace("CN=", "");
-                        lookUpCertificate = keyStoreReader.getCertificateBySerial(commonNameExtracted);
-                        break;
+            if (distinguishedName.contains("CN=")) {
+                String[] dnSplits = null;
+                if (distinguishedName.contains("/")) {
+                    dnSplits = distinguishedName.split("/");
+                } else if (distinguishedName.contains(",")) {
+                    //some older versions of nginx will forward the client certificate subject dn separated with commas
+                    dnSplits = distinguishedName.split(",");
+                }
+                String commonNameExtracted = null;
+                int tenantId = 0;
+                if (dnSplits != null && dnSplits.length >= 1) {
+                    for (String dnPart : dnSplits) {
+                        if (dnPart.contains("CN=")) {
+                            commonNameExtracted = dnPart.replace("CN=", "");
+                        } else if (dnPart.contains("OU=")) {
+                            //the OU of the certificate will be like OU=tenant_<TENANT_ID> ex: OU=tenant_-1234
+                            //splitting by underscore to extract the tenant domain
+                            String[] orgUnitSplits = dnPart.split("_");
+                            tenantId = Integer.parseInt(orgUnitSplits[1]);
+                        }
                     }
                 }
+
+                lookUpCertificate = keyStoreReader.getCertificateBySerial(commonNameExtracted, tenantId);
+
             } else {
                 LdapName ldapName;
                 try {
@@ -813,10 +829,6 @@ public class CertificateGenerator {
 
             BigInteger serialNumber = BigInteger.valueOf(System.currentTimeMillis());
 
-<<<<<<< HEAD:components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/impl/CertificateGenerator.java
-<<<<<<< HEAD:components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/impl/CertificateGenerator.java
-=======
->>>>>>> d34adaae96 (Fix issue with Nginx not recognizing the SCEP client certificate (#105)):components/certificate-mgt/org.wso2.carbon.certificate.mgt.core/src/main/java/org/wso2/carbon/certificate/mgt/core/impl/CertificateGenerator.java
             //Reversing the order of components of the subject DN due to Nginx not verifying the client certificate
             //generated by Java using this subject DN.
             //Ref: https://stackoverflow.com/questions/33769978 & engineering mail SCEP implementation for Android
@@ -829,8 +841,9 @@ public class CertificateGenerator {
             X500Name issuerName = new X500Name(subjectDn);
             String commonName = certificationRequest.getSubject().getRDNs(BCStyle.CN)[0].getFirst()
                     .getValue().toString();
-            X500Name subjectName = new X500Name("O=" + commonName + "O=AndroidDevice,CN=" +
-                    serialNumber);
+            int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+            X500Name subjectName = new X500Name("O=" + commonName + ",CN=" +
+                    serialNumber + ", OU=tenant_"+tenantId);
             Date startDate = new Date(System.currentTimeMillis());
             Date endDate = new Date(System.currentTimeMillis()
                     + TimeUnit.DAYS.toMillis(365 * 100));

components/certificate-mgt/io.entgra.device.mgt.core.certificate.mgt.core/src/main/java/io/entgra/device/mgt/core/certificate/mgt/core/impl/KeyStoreReader.java

@@ -271,6 +271,43 @@ public class KeyStoreReader {
         return raPrivateKey;
     }
 
+    public CertificateResponse getCertificateBySerial(String serialNumber, int tenantId) throws KeystoreException {
+        CertificateResponse certificateResponse = null;
+        try {
+            CertificateCacheManager cacheManager = CertificateCacheManagerImpl.getInstance();
+            certificateResponse = cacheManager.getCertificateBySerial(serialNumber);
+            if (certificateResponse == null) {
+                try {
+                    CertificateManagementDAOFactory.openConnection();
+                    certificateResponse = certDao.retrieveCertificate(serialNumber, tenantId);
+                } catch (SQLException e) {
+                    String errorMsg = "Error when making a connection to the database.";
+                    throw new KeystoreException(errorMsg, e);
+                } finally {
+                    CertificateManagementDAOFactory.closeConnection();
+                }
+                if (certificateResponse != null && certificateResponse.getCertificate() != null) {
+                    Certificate certificate = (Certificate) Serializer.deserialize(certificateResponse.getCertificate());
+                    if (certificate instanceof X509Certificate) {
+                        X509Certificate x509cert = (X509Certificate) certificate;
+                        String commonName = CertificateGenerator.getCommonName(x509cert);
+                        certificateResponse.setCommonName(commonName);
+                        cacheManager.addCertificateBySerial(serialNumber, certificateResponse);
+                    }
+                }
+            }
+        } catch (CertificateManagementDAOException e) {
+            String errorMsg = "Error when retrieving certificate from the the database for the serial number: " +
+                    serialNumber;
+            throw new KeystoreException(errorMsg, e);
+
+        } catch (ClassNotFoundException | IOException e) {
+            String errorMsg = "Error when de-serializing saved certificate.";
+            throw new KeystoreException(errorMsg, e);
+        }
+        return certificateResponse;
+    }
+
     public CertificateResponse getCertificateBySerial(String serialNumber) throws KeystoreException {
         CertificateResponse certificateResponse = null;
         try {

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/common/exception/StorageManagementException.java

@@ -0,0 +1,32 @@
+/* Copyright (c) 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you 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 org.wso2.carbon.device.mgt.core.common.exception;
+
+/**
+ * Represents the exception thrown during storing and retrieving the artifacts.
+ */
+public class StorageManagementException extends Exception {
+    public StorageManagementException(String message, Throwable ex) {
+        super(message, ex);
+    }
+
+    public StorageManagementException(String message) {
+        super(message);
+    }
+}
+