Missing file

git-svn-id: https://svn.libreccm.org/ccm/ccm_ng@5694 8810af33-2d31-482b-a856-94f89814c4df

ccm-core/src/main/java/org/libreccm/security/JwtVerifyingFilter.java

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+/*
+ * Copyright (C) 2018 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package org.libreccm.security;
+
+import com.arsdigita.kernel.KernelConfig;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import org.apache.shiro.SecurityUtils;
+import org.apache.shiro.subject.Subject;
+import org.apache.shiro.subject.SubjectContext;
+import org.apache.shiro.web.filter.AccessControlFilter;
+
+import java.security.Key;
+import java.util.Base64;
+
+import javax.crypto.spec.SecretKeySpec;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+/**
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public class JwtVerifyingFilter extends AccessControlFilter {
+
+    @Override
+    protected boolean isAccessAllowed(
+        final ServletRequest request,
+        final ServletResponse response,
+        final Object mappedValue) throws Exception {
+
+        final HttpServletRequest httpRequest = (HttpServletRequest) request;
+        final String jwt = httpRequest.getHeader("Authorization");
+        if (jwt == null || jwt.startsWith("Bearer ")) {
+            return false;
+        }
+
+        final SignatureAlgorithm signAlgo = SignatureAlgorithm.HS512;
+        final Key key = new SecretKeySpec(
+            Base64.getDecoder().decode(
+                KernelConfig.getConfig().getJwtSecret()),
+            signAlgo.getJcaName());
+
+        final String jwtClaims = jwt.substring(jwt.indexOf((" ")));
+        final Claims claims = Jwts
+            .parser()
+            .setSigningKey(key)
+            .parseClaimsJws(jwtClaims)
+            .getBody();
+
+        final String userName = claims.getSubject();
+        final Subject subject = SecurityUtils.getSubject();
+        
+        return userName.equals(subject.getPrincipal());
+    }
+
+    @Override
+    protected boolean onAccessDenied(
+        final ServletRequest request,
+        final ServletResponse response) throws Exception {
+
+        final HttpServletResponse httpResponse = (HttpServletResponse) response;
+        httpResponse.setStatus(HttpServletResponse.SC_FORBIDDEN);
+        return false;
+    }
+
+}