/*

  * This file is part of dependency-check-core.

  *

  * Dependency-check-core 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.

  *

  * Dependency-check-core 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

  * dependency-check-core. If not, see http://www.gnu.org/licenses/.

  *

  * Copyright (c) 2012 Jeremy Long. All Rights Reserved.

  */

 package org.owasp.dependencycheck.analyzer;

 import java.io.IOException;

 import java.sql.SQLException;

 import java.util.List;

 import java.util.Set;

 import org.owasp.dependencycheck.Engine;

 import org.owasp.dependencycheck.dependency.Dependency;

 import org.owasp.dependencycheck.dependency.Vulnerability;

 import org.owasp.dependencycheck.dependency.Identifier;

 import org.owasp.dependencycheck.data.nvdcve.CveDB;

 import org.owasp.dependencycheck.data.nvdcve.DatabaseException;

 /**

  * NvdCveAnalyzer is a utility class that takes a project dependency and

  * attempts to discern if there is an associated CVEs. It uses the the

  * identifiers found by other analyzers to lookup the CVE data.

  *

  * @author Jeremy Long (jeremy.long@owasp.org)

  */

 public class NvdCveAnalyzer implements Analyzer {

     /**

      * The maximum number of query results to return.

      */

     static final int MAX_QUERY_RESULTS = 100;

     /**

      * The CVE Index.

      */

     private CveDB cveDB;

     /**

      * Opens the data source.

      *

      * @throws SQLException thrown when there is a SQL Exception

      * @throws IOException thrown when there is an IO Exception

      * @throws DatabaseException thrown when there is a database exceptions

      * @throws ClassNotFoundException thrown if the h2 database driver cannot be

      * loaded

      */

     public void open() throws SQLException, IOException, DatabaseException, ClassNotFoundException {

         cveDB = new CveDB();

         cveDB.open();

     }

     /**

      * Closes the data source.

      */

     public void close() {

         cveDB.close();

         cveDB = null;

     }

     /**

      * Returns the status of the data source - is the database open.

      *

      * @return true or false.

      */

     public boolean isOpen() {

         return (cveDB != null);

     }

     /**

      * Ensures that the CVE Database is closed.

      *

      * @throws Throwable when a throwable is thrown.

      */

     @Override

     protected void finalize() throws Throwable {

         super.finalize();

         if (isOpen()) {

             close();

         }

     }

     /**

      * Analyzes a dependency and attempts to determine if there are any CPE

      * identifiers for this dependency.

      *

      * @param dependency The Dependency to analyze

      * @param engine The analysis engine

      * @throws AnalysisException is thrown if there is an issue analyzing the

      * dependency

      */

     public void analyze(Dependency dependency, Engine engine) throws AnalysisException {

         for (Identifier id : dependency.getIdentifiers()) {

             if ("cpe".equals(id.getType())) {

                 try {

                     final String value = id.getValue();

                     final List<Vulnerability> vulns = cveDB.getVulnerabilities(value);

                     dependency.getVulnerabilities().addAll(vulns);

 //TODO - remove this comment block after additional testing is completed

 //note - valid match functionality has been moved into the CveDB class.

 ////                    for (Vulnerability v : vulns) {

 ////                        if (isValidMatch(dependency, v)) {

 ////                            dependency.addVulnerability(v);

 ////                        }

 ////                    }

                 } catch (DatabaseException ex) {

                     throw new AnalysisException(ex);

                 }

             }

         }

     }

     /**

      * Returns true because this analyzer supports all dependency types.

      *

      * @return true.

      */

     public Set<String> getSupportedExtensions() {

         return null;

     }

     /**

      * Returns the name of this analyzer.

      *

      * @return the name of this analyzer.

      */

     public String getName() {

         return "NVD CVE Analyzer";

     }

     /**

      * Returns true because this analyzer supports all dependency types.

      *

      * @param extension the file extension of the dependency being analyzed.

      * @return true.

      */

     public boolean supportsExtension(String extension) {

         return true;

     }

     /**

      * Returns the analysis phase that this analyzer should run in.

      *

      * @return the analysis phase that this analyzer should run in.

      */

     public AnalysisPhase getAnalysisPhase() {

         return AnalysisPhase.FINDING_ANALYSIS;

     }

     /**

      * Opens the NVD CVE Lucene Index.

      *

      * @throws Exception is thrown if there is an issue opening the index.

      */

     public void initialize() throws Exception {

         this.open();

     }

 //TODO - remove this comment block after additional testing is completed

 // The following check has been moved into the CveDB class.

 ////    /**

 ////     * <p>Determines if this is a valid vulnerability match for the given

 ////     * dependency. Specifically, this is concerned with ensuring the version

 ////     * numbers are correct.</p>

 ////     * <p>Currently, this is focused on the issues with the versions for Struts

 ////     * 1 and Struts 2. In the future this will due better matching on more

 ////     * version numbers.</p>

 ////     *

 ////     * @param dependency the dependency

 ////     * @param v the vulnerability

 ////     * @return returns true if the vulnerability is for the given dependency

 ////     */

 ////    private boolean isValidMatch(final Dependency dependency, final Vulnerability v) {

 ////        //right now I only know of the issue with Struts1/2

 ////        // start with fixing this problem.

 ////

 ////        //TODO extend this solution to do better version matching for the vulnerable software.

 ////        boolean struts1 = false;

 ////        boolean struts2 = false;

 ////        for (Identifier i : dependency.getIdentifiers()) {

 ////            if (i.getValue().startsWith("cpe:/a:apache:struts:")) {

 ////                final char version = i.getValue().charAt(21);

 ////                if (version == '1') {

 ////                    struts1 = true;

 ////                }

 ////                if (version == '2') {

 ////                    struts2 = true;

 ////                }

 ////            }

 ////        }

 ////        if (!struts1 && !struts2) {

 ////            return true; //we are not looking at struts, so return true.

 ////        }

 ////        if (struts1 && struts2) {

 ////            return true; //there is a mismatch here, but we can't solve it here so we return valid.

 ////        }

 ////        if (struts1) {

 ////            boolean hasStruts1Vuln = false;

 ////            boolean hasStruts2PreviousVersion = false;

 ////            for (VulnerableSoftware vs : v.getVulnerableSoftware()) {

 ////                //TODO FIX THIS

 ////                //hasStruts2PreviousVersion |= vs.hasPreviousVersion() && vs.getName().charAt(21) == '2';

 ////                //hasStruts1Vuln |= vs.getName().charAt(21) == '1';

 ////            }

 ////            if (!hasStruts1Vuln && hasStruts2PreviousVersion) {

 ////                return false;

 ////            }

 ////        }

 ////

 ////        return true;

 ////    }

 }