Description: Use reflection to access internal X509 API
 sun.security.x509 has breaking API changes between Java 17 and Java 21. 
 Use reflection to access internal API until .M27 release of Apache DS that
 switches to Bouncycastle API for certificate manipulation.
Author: Vladimir Petko <vladimir.petko@canonical.com>
Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1052589
Forwarded: not-needed
Last-Update: 2023-11-20
--- a/core/src/main/java/org/apache/directory/server/core/security/CertificateUtil.java
+++ b/core/src/main/java/org/apache/directory/server/core/security/CertificateUtil.java
@@ -63,6 +63,304 @@
 import sun.security.x509.X500Name;
 import sun.security.x509.X509CertImpl;
 import sun.security.x509.X509CertInfo;
+import  sun.security.x509.Extension;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+final class X509ImplFactory
+{
+    private static Method NEW_SIGNED = null;
+    private static Method SIGN = null;
+
+    static
+    {
+        try
+        {
+            NEW_SIGNED = X509CertImpl.class.getMethod( "newSigned", X509CertInfo.class, java.security.PrivateKey.class, String.class );
+        }
+        catch ( NoSuchMethodException | SecurityException e )
+        {
+            try
+            {
+                SIGN = X509CertImpl.class.getMethod( "sign", java.security.PrivateKey.class, String.class );
+            }
+            catch ( NoSuchMethodException | SecurityException ex )
+            {
+                throw new RuntimeException( ex );
+            }
+        }
+    }
+
+    private X509ImplFactory( )
+    {
+    }
+
+    public static X509CertImpl create( X509CertInfo info, java.security.PrivateKey pk, String algo )
+    {
+        try
+        {
+            if ( NEW_SIGNED == null )
+            {
+                X509CertImpl impl = X509CertImpl.class.getConstructor( X509CertInfo.class ).newInstance( info );
+                SIGN.invoke( impl, pk, algo );
+                return impl;
+            }
+            return ( X509CertImpl ) NEW_SIGNED.invoke( null, info, pk, algo );
+        }
+        catch ( IllegalAccessException | IllegalArgumentException | InvocationTargetException | InstantiationException | NoSuchMethodException | SecurityException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+}
+
+class CertificateExtensionsProxy
+{
+    private static Method SET = null;
+    private static Method SET_EXTENSION = null;
+    private CertificateExtensions _ext = null;
+    static
+    {
+        try
+        {
+            SET = CertificateExtensions.class.getMethod( "set", String.class, Object.class );
+        }
+        catch ( NoSuchMethodException | SecurityException e )
+        {
+            try
+            {
+                SET_EXTENSION = CertificateExtensions.class.getMethod( "setExtension", String.class, Extension.class );
+            }
+            catch ( NoSuchMethodException | SecurityException ex )
+            {
+                throw new RuntimeException( ex );
+            }
+        }
+    }
+
+    CertificateExtensionsProxy( CertificateExtensions ext )
+    {
+        _ext = ext;
+    }
+
+    public void set( String name, Extension o )
+    {
+        try
+        {
+            if ( SET == null )
+            {
+                SET_EXTENSION.invoke( _ext, name, o );
+            }
+            else
+            {
+                SET.invoke( _ext, name, o );
+            }
+        }
+        catch ( IllegalAccessException | IllegalArgumentException | InvocationTargetException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+}
+
+class X509CertInfoProxy
+{
+    private static Method SET = null;
+    private static Method SET_VERSION = null;
+    private static Method SET_SERIAL_NUMBER = null;
+    private static Method SET_ALGORITHM_ID = null;
+    private static Method SET_ISSUER = null;
+    private static Method SET_VALIDITY = null;
+    private static Method SET_SUBJECT = null;
+    private static Method SET_KEY = null;
+    private static Method SET_EXTENSIONS = null;
+    private X509CertInfo _info = null;
+
+    static
+    {
+        Class clazz = X509CertInfo.class;
+        try
+        {
+            SET = clazz.getMethod( "set", String.class, Object.class );
+        }
+        catch ( NoSuchMethodException | SecurityException e )
+        {
+            try
+            {
+                SET_VERSION = clazz.getMethod( "setVersion", CertificateVersion.class );
+                SET_SERIAL_NUMBER = clazz.getMethod( "setSerialNumber", CertificateSerialNumber.class  );
+                SET_ALGORITHM_ID =  clazz.getMethod( "setAlgorithmId", CertificateAlgorithmId.class );
+                SET_ISSUER = clazz.getMethod( "setIssuer", X500Name.class );
+                SET_VALIDITY = clazz.getMethod( "setValidity", CertificateValidity.class );
+                SET_SUBJECT =  clazz.getMethod( "setSubject", X500Name.class );
+                SET_KEY = clazz.getMethod( "setKey", CertificateX509Key.class );
+                SET_EXTENSIONS = clazz.getMethod( "setExtensions", CertificateExtensions.class );
+            }
+            catch ( NoSuchMethodException | SecurityException ex )
+            {
+                throw new RuntimeException( ex );
+            }
+        }
+    }
+
+    X509CertInfoProxy( X509CertInfo info )
+    {
+        _info = info;
+    }
+
+    public void setVersion( CertificateVersion v )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.VERSION, v );
+            }
+            else
+            {
+                SET_VERSION.invoke( _info, v );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+    public void setSerialNumber( CertificateSerialNumber sn )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.SERIAL_NUMBER, sn );
+            }
+            else
+            {
+                SET_SERIAL_NUMBER.invoke( _info, sn );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+    public void setAlgorithmId( CertificateAlgorithmId id )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.ALGORITHM_ID, id );
+            }
+            else
+            {
+                SET_ALGORITHM_ID.invoke( _info, id );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+    public void setIssuer( X500Name id )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.ISSUER, id );
+            }
+            else
+            {
+                SET_ISSUER.invoke( _info, id );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+    public void setValidity( CertificateValidity id )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.VALIDITY, id );
+            }
+            else
+            {
+                SET_VALIDITY.invoke( _info, id );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+    public void setSubject( X500Name id )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.SUBJECT, id );
+            }
+            else
+            {
+                SET_SUBJECT.invoke( _info, id );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+    public void setKey( CertificateX509Key id )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.KEY, id );
+            }
+            else
+            {
+                SET_KEY.invoke( _info, id );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+
+    public void setExtensions( CertificateExtensions id )
+    {
+        try
+        {
+            if ( SET != null )
+            {
+                SET.invoke( _info, X509CertInfo.EXTENSIONS, id );
+            }
+            else
+            {
+                SET_EXTENSIONS.invoke( _info, id  );
+            }
+        }
+        catch ( InvocationTargetException | IllegalAccessException e )
+        {
+            throw new RuntimeException( e );
+        }
+    }
+}
 
 /**
  * Helper class used to generate self-signed certificates, and load a KeyStore
@@ -90,19 +388,21 @@
         Date to = new Date( from.getTime() + days * 86_400_000L );
         CertificateValidity interval = new CertificateValidity( from, to );
 
+        X509CertInfoProxy proxy = new X509CertInfoProxy( info );
+
         // Feed the certificate info structure
         // version         [0]  EXPLICIT Version DEFAULT v1
         // Version  ::=  INTEGER  {  v1(0), v2(1), v3(2)  }
-        info.set( X509CertInfo.VERSION, new CertificateVersion( CertificateVersion.V3 ) );
+        proxy.setVersion( new CertificateVersion( CertificateVersion.V3 ) );
         
         // serialNumber         CertificateSerialNumber
         // CertificateSerialNumber  ::=  INTEGER
         BigInteger serialNumber = new BigInteger( 64, new SecureRandom() );
-        info.set( X509CertInfo.SERIAL_NUMBER, new CertificateSerialNumber( serialNumber ) );
+        proxy.setSerialNumber( new CertificateSerialNumber( serialNumber ) );
 
         // signature            AlgorithmIdentifier
         AlgorithmId algo = AlgorithmId.get( algoStr );
-        info.set( X509CertInfo.ALGORITHM_ID, new CertificateAlgorithmId( algo ) );
+        proxy.setAlgorithmId( new CertificateAlgorithmId( algo ) );
 
         // issuer               Name
         // Name ::= CHOICE {
@@ -115,13 +415,13 @@
         //          value    AttributeValue }
         // AttributeType ::= OBJECT IDENTIFIER
         // AttributeValue ::= ANY DEFINED BY AttributeType
-        info.set( X509CertInfo.ISSUER, issuer );
+        proxy.setIssuer( issuer );
         
         // validity             Validity,
         // Validity ::= SEQUENCE {
         //          notBefore      Time,
         //          notAfter       Time }
-        info.set( X509CertInfo.VALIDITY, interval );
+        proxy.setValidity( interval );
         
         // subject              Name
         // Name ::= CHOICE {
@@ -134,17 +434,17 @@
         //          value    AttributeValue }
         // AttributeType ::= OBJECT IDENTIFIER
         // AttributeValue ::= ANY DEFINED BY AttributeType
-        info.set( X509CertInfo.SUBJECT, subject );
+        proxy.setSubject( subject );
         
         // subjectPublicKeyInfo SubjectPublicKeyInfo,
         // SubjectPublicKeyInfo  ::=  SEQUENCE  {
         //          algorithm            AlgorithmIdentifier,
         //          subjectPublicKey     BIT STRING  }
-        info.set( X509CertInfo.KEY, new CertificateX509Key( keyPair.getPublic() ) );
+        proxy.setKey( new CertificateX509Key( keyPair.getPublic() ) );
 
         // Extensions. Basically, a subjectAltName and a Basic-Constraint 
         CertificateExtensions extensions = new CertificateExtensions();
-
+        CertificateExtensionsProxy extProxy = new CertificateExtensionsProxy(extensions);
         // SubjectAltName
         GeneralNames names = new GeneralNames();
         names.add( new GeneralName( new DNSName( InetAddress.getLocalHost().getHostName() ) ) );
@@ -158,17 +458,16 @@
         //            DerValue.tag_IA5String, "*.apache.org" ) ) ) );
         SubjectAlternativeNameExtension subjectAltName = new SubjectAlternativeNameExtension( names );
         
-        extensions.set( subjectAltName.getExtensionId().toString(), subjectAltName );
+        extProxy.set( subjectAltName.getExtensionId().toString(), subjectAltName );
 
         // The Basic-Constraint,
         BasicConstraintsExtension basicConstraint = new BasicConstraintsExtension( CRITICAL, isCA, -1 );
-        extensions.set( basicConstraint.getExtensionId().toString(), basicConstraint );
+        extProxy.set( basicConstraint.getExtensionId().toString(), basicConstraint );
 
         // Inject the extensions into the cert
-        info.set( X509CertInfo.EXTENSIONS, extensions );
+        proxy.setExtensions( extensions );
     }
-    
-    
+
     /**
      * Create a self signed certificate
      * 
@@ -194,8 +493,7 @@
         setInfo( info, issuer, issuer, keyPair, days, algoStr, SELF_SIGNED );
         
         // Sign the cert to identify the algorithm that's used.
-        X509CertImpl certificate = new X509CertImpl( info );
-        certificate.sign( keyPair.getPrivate(), algoStr );
+        X509CertImpl certificate = X509ImplFactory.create(info, keyPair.getPrivate(), algoStr);
 
         return certificate;
     }
@@ -226,8 +524,7 @@
         setInfo( info, subject, issuer, keyPair, days, algoStr, CA_SIGNED );
          
         // Sign the cert to identify the algorithm that's used.
-        X509CertImpl certificate = new X509CertImpl( info );
-        certificate.sign( keyPair.getPrivate(), algoStr );
+        X509CertImpl certificate = X509ImplFactory.create(info, keyPair.getPrivate(), algoStr);
 
         return certificate;
     }