feat: Store fullchain certificate information alongside certs

src/main/java/de/mlessmann/certassist/models/Certificate.java

@@ -46,10 +46,16 @@ public class Certificate {
     private List<CertificateExtension> certificateExtension = new ArrayList<>();
 
     @Lob
+    @Column(nullable = false)
     private byte[] cert = new byte[0];
 
     @Lob
+    @Column(nullable = false)
     private byte[] privateKey = new byte[0];
 
+    @Lob
+    @Column
+    private byte[] fullchain;
+
     private String fingerprint;
 }

src/main/java/de/mlessmann/certassist/openssl/CertificateUsage.java

@@ -1,6 +1,7 @@
 package de.mlessmann.certassist.openssl;
 
 import java.nio.file.Path;
+import org.springframework.lang.Nullable;
 
 /**
  * Instance of a certificate that is temporarily stored on disk to be available for use in command line calls.
@@ -8,8 +9,30 @@ import java.nio.file.Path;
  * @implSpec The files should be removed from disk when the instance is closed, UNLESS the provided paths are the permanent storage location for the certificate files.
  */
 public interface CertificateUsage extends AutoCloseable {
+    /**
+     * Returns the path to the certificate file (on disk, potentially temporary depending on the storage implementation).
+     */
     Path certificatePath();
+
+    /**
+     * Returns the path to the private key file (on disk, potentially temporary depending on the storage implementation).
+     * This file should also be encrypted.
+     * @see CertificatePasswordProvider
+     */
     Path certificateKeyPath();
+
+    /**
+     * Returns the path to the fullchain file (on disk, potentially temporary depending on the storage implementation).
+     * This should contain the entire certification chain from (inclusive) the certificate to the root authority (inclusive).
+     * @implSpec This method may return {@code null} if the certificate is self-signed.
+     */
+    @Nullable
+    Path fullchainPath();
+
+    /**
+     * String representation of the certificate's fingerprint.
+     * In case of OpenSSL, this should be in the form of: {@code SHA1;<HEX>:<HEX>:...}
+     */
     String fingerprint();
 
     @Override

src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateCreator.java

@@ -89,7 +89,7 @@ public class OpenSSLCertificateCreator {
             Path certificate = createCertificate(request, keyFile, tmpDir.resolve("certificate.crt"), certPassword);
             String fingerprint = getCertificateFingerprint(certificate);
             passwordProvider.setPasswordFor(fingerprint, certPassword);
-            return new OpenSSLCertificateResult(tmpDir, certificate, keyFile, fingerprint);
+            return new OpenSSLCertificateResult(tmpDir, certificate, keyFile, certificate, fingerprint);
         }
 
         try (var certAuthority = certificateProvider.requestCertificateUsage(request.getTrustingAuthority())) {
@@ -103,7 +103,16 @@ public class OpenSSLCertificateCreator {
             );
             String fingerprint = getCertificateFingerprint(signedCert);
             passwordProvider.setPasswordFor(fingerprint, certPassword);
-            return new OpenSSLCertificateResult(tmpDir, signedCert, keyFile, fingerprint);
+
+            Path fullchain = tmpDir.resolve("fullchain.pem");
+            try {
+                Files.write(fullchain, Files.readAllBytes(certAuthority.certificatePath()), StandardOpenOption.CREATE);
+                Files.write(fullchain, Files.readAllBytes(signedCert), StandardOpenOption.APPEND);
+            } catch (IOException e) {
+                throw new CommandLineOperationException("Failed to create fullchain file.", e);
+            }
+
+            return new OpenSSLCertificateResult(tmpDir, signedCert, keyFile, fullchain, fingerprint);
         }
     }
 

src/main/java/de/mlessmann/certassist/openssl/OpenSSLCertificateResult.java

@@ -16,6 +16,7 @@ public class OpenSSLCertificateResult implements CertificateUsage {
     private final Path tmpDir;
     private final Path certificatePath;
     private final Path privateKeyPath;
+    private final Path fullchainPath;
     private final String certificateFingerPrint;
 
     @Override
@@ -28,6 +29,11 @@ public class OpenSSLCertificateResult implements CertificateUsage {
         return privateKeyPath;
     }
 
+    @Override
+    public Path fullchainPath() {
+        return fullchainPath;
+    }
+
     @Override
     public String fingerprint() {
         return certificateFingerPrint;

src/main/java/de/mlessmann/certassist/service/CertificateProviderImpl.java

@@ -2,6 +2,8 @@ package de.mlessmann.certassist.service;
 
 import de.mlessmann.certassist.Constants;
 import de.mlessmann.certassist.DeleteRecursiveFileVisitor;
+import de.mlessmann.certassist.models.Certificate;
+import de.mlessmann.certassist.models.CertificateType;
 import de.mlessmann.certassist.openssl.CertificateProvider;
 import de.mlessmann.certassist.openssl.CertificateUsage;
 import de.mlessmann.certassist.repositories.CertificateRepository;
@@ -27,15 +29,22 @@ public class CertificateProviderImpl implements CertificateProvider {
 
     @Override
     public CertificateUsage requestCertificateUsage(String fingerprint) {
-        var certFromDB = certificateRepository.findByFingerprintIs(fingerprint);
+        Certificate certFromDB = certificateRepository.findByFingerprintIs(fingerprint);
         if (certFromDB == null) {
             throw new IllegalArgumentException("Unknown fingerprint");
         }
 
+        boolean selfSigned =
+            certFromDB.getType() == CertificateType.ROOT_CA || certFromDB.getType() == CertificateType.STANDALONE_CERT;
+
         try {
             Path tempDirectory = Files.createTempDirectory(Constants.CERTASSIST_TMP_PREFIX);
             Files.write(tempDirectory.resolve("key.pem"), certFromDB.getPrivateKey(), CREATE_TRUNCATE);
             Files.write(tempDirectory.resolve("cert.pem"), certFromDB.getCert(), CREATE_TRUNCATE);
+            if (!selfSigned) {
+                Files.write(tempDirectory.resolve("fullchain.pem"), certFromDB.getFullchain(), CREATE_TRUNCATE);
+            }
+
             return new ExtractedCert(tempDirectory, certFromDB.getFingerprint());
         } catch (IOException e) {
             // TODO: Better exception definitions
@@ -55,6 +64,15 @@ public class CertificateProviderImpl implements CertificateProvider {
             return this.tempDir.resolve("cert.pem");
         }
 
+        @Override
+        public Path fullchainPath() {
+            Path fcFile = this.tempDir.resolve("fullchain.pem");
+            if (Files.exists(fcFile)) {
+                return fcFile;
+            }
+            return null;
+        }
+
         @Override
         public void close() {
             try {

src/test/java/de/mlessmann/certassist/TestOpenSSLCertificateCreator.java

@@ -5,9 +5,8 @@ import static org.mockito.Mockito.*;
 
 import de.mlessmann.certassist.openssl.*;
 import de.mlessmann.certassist.openssl.CertificateRequest.RequestType;
-import java.nio.file.Files;
 import java.nio.file.Path;
-import java.nio.file.StandardOpenOption;
+import java.util.Objects;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
@@ -59,11 +58,11 @@ class TestOpenSSLCertificateCreator {
             when(certificateProvider.requestCertificateUsage(cert.fingerprint())).thenReturn(spiedCert);
             try (var childCert = certificateCreator.createCertificate(childRequest)) {
                 System.out.println("Child certificate created: " + childCert);
-                Path fullchain = childCert.certificatePath().getParent().resolve("fullchain.pem");
-                Files.write(fullchain, Files.readAllBytes(childCert.certificatePath()), StandardOpenOption.CREATE);
-                Files.write(fullchain, Files.readAllBytes(cert.certificatePath()), StandardOpenOption.APPEND);
-
-                assertThat(certificateCreator.verifyCertificate(cert.certificatePath(), fullchain)).isEqualTo(true);
+                Path fullchain = childCert.fullchainPath();
+                assertThat(
+                    certificateCreator.verifyCertificate(cert.certificatePath(), Objects.requireNonNull(fullchain))
+                )
+                    .isEqualTo(true);
             }
         }
     }