From e86f3c41186ab42109aa8e19697a56b38a3ef0df Mon Sep 17 00:00:00 2001
From: ulrich@undisclosed
Date: Sat, 09 May 2020 15:26:26 +0000
Subject: [PATCH] Info-Dialog

---
 src/java/de/uhilger/um/TomcatDigester.java |   71 ++++++++++++++++++++++++++---------
 1 files changed, 52 insertions(+), 19 deletions(-)

diff --git a/src/java/de/uhilger/um/TomcatDigester.java b/src/java/de/uhilger/um/TomcatDigester.java
index 3c152fd..75108a2 100644
--- a/src/java/de/uhilger/um/TomcatDigester.java
+++ b/src/java/de/uhilger/um/TomcatDigester.java
@@ -1,27 +1,31 @@
 /*
- Nutzerverwaltung - A Generic User Manager
- Copyright (c) 2016  Ulrich Hilger
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU Affero General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- GNU Affero General Public License for more details.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *  Nutzerverwaltung - User and role management in your browser
+ *  Copyright (C) 2011-2016 Ulrich Hilger, http://uhilger.de
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see http://www.gnu.org/licenses/
  */
+
 package de.uhilger.um;
 
-import org.apache.catalina.realm.RealmBase;
+import java.security.NoSuchAlgorithmException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.apache.catalina.realm.MessageDigestCredentialHandler;
 
 /**
- * Ein Digester f&uuml;r die Nutzerverwaltung, der die Klasse 
- * RealmBase von Tomcat zum Verschl&uuml;sseln nutzt
+ * Ein Digester für die Nutzerverwaltung, der die Klasse 
+ * RealmBase von Tomcat zum Verschlüsseln nutzt
  *
  * @author Copyright (c) Ulrich Hilger, http://uhilger.de
  * @author Published under the terms and conditions of the
@@ -34,7 +38,36 @@
 
   @Override
   public String digest(String text, String algorithm, String encoding) {
-    return RealmBase.Digest(text, algorithm, encoding);
+    /*
+    Die Methode RealmBase.Digest ist mit dem Hinweis 'unused' ab 
+    Tomcat 9 entfernt worden. Das, obwohl die Tomcat-eigene Dokumentation
+    diese Methode ausdruecklich nennt, vgl. "Digested Passwords"
+    auf http://tomcat.apache.org/tomcat-10.0-doc/realm-howto.html
+    
+    Als Ersatz wird der MessageDigestCredentialHandler verwendet
+    */
+    //return RealmBase.Digest(text, algorithm, encoding);
+    //return text;
+    MessageDigestCredentialHandler mh = new MessageDigestCredentialHandler();
+    try {
+      mh.setAlgorithm(algorithm);
+    } catch (NoSuchAlgorithmException ex) {
+      Logger.getLogger(TomcatDigester.class.getName()).log(Level.SEVERE, null, ex);
+    }
+    mh.setEncoding(encoding);
+    return mh.mutate(text);
+  }
+
+  @Override
+  public boolean matches(String inputCredentials, String storedCredentials, String algorithm, String encoding) {
+    MessageDigestCredentialHandler mh = new MessageDigestCredentialHandler();
+    try {
+      mh.setAlgorithm(algorithm);
+    } catch (NoSuchAlgorithmException ex) {
+      Logger.getLogger(TomcatDigester.class.getName()).log(Level.SEVERE, null, ex);
+    }
+    mh.setEncoding(encoding);
+    return mh.matches(inputCredentials, storedCredentials);
   }
   
 }

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