/* PluginAppVerifier.java
   Copyright (C) 2012 Red Hat, Inc.

This file is part of IcedTea.

IcedTea 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, version 2.

IcedTea 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
IcedTea; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is making a
combined work based on this library. Thus, the terms and conditions of the GNU
General Public License cover the whole combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules, and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms and
conditions of the license of that module. An independent module is a module
which is not derived from or based on this library. If you modify this library,
you may extend this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this exception
statement from your version.
*/

package net.sourceforge.jnlp.security;

import net.adoptopenjdk.icedteaweb.client.parts.dialogs.security.SecurityDialogs;
import net.adoptopenjdk.icedteaweb.ui.swing.dialogresults.Primitive;
import net.adoptopenjdk.icedteaweb.ui.swing.dialogresults.YesNoSandbox;
import net.sourceforge.jnlp.JNLPFile;
import net.sourceforge.jnlp.LaunchException;
import net.sourceforge.jnlp.runtime.classloader.SecurityDelegate;
import net.sourceforge.jnlp.tools.CertInformation;
import net.sourceforge.jnlp.tools.JarCertVerifier;

import java.security.cert.CertPath;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import static net.sourceforge.jnlp.LaunchException.FATAL;

public class PluginAppVerifier implements AppVerifier {

    @Override
    public boolean hasAlreadyTrustedPublisher(
            Map<CertPath, CertInformation> certs,
            Map<String, Integer> signedJars) {

        boolean allPublishersTrusted = true;

        for(String jarName : signedJars.keySet()) {
            int numbSignableEntries = signedJars.get(jarName);
            boolean publisherTrusted = false;

            for (CertInformation certInfo : certs.values()) {
                if(certInfo.isSignerOfJar(jarName)
                        && numbSignableEntries == certInfo.getNumJarEntriesSigned(jarName)
                        && certInfo.isPublisherAlreadyTrusted()) {
                    publisherTrusted = true;
                    break;
                }
            }

            allPublishersTrusted &= publisherTrusted;
        }
        return allPublishersTrusted;
    }

    @Override
    public boolean hasRootInCacerts(Map<CertPath, CertInformation> certs,
            Map<String, Integer> signedJars) {

        boolean allRootCAsTrusted = true;

        for(String jarName : signedJars.keySet()) {
            int numbSignableEntries = signedJars.get(jarName);
            boolean rootCATrusted = false;

            for (CertInformation certInfo : certs.values()) {
                if(certInfo.isSignerOfJar(jarName)
                        && numbSignableEntries == certInfo.getNumJarEntriesSigned(jarName)
                        && certInfo.isRootInCacerts()) {
                    rootCATrusted = true;
                    break;
                }
            }

            allRootCAsTrusted &= rootCATrusted;
        }
        return allRootCAsTrusted;
    }

    @Override
    public boolean isFullySigned(Map<CertPath, CertInformation> certs,
            Map<String, Integer> signedJars) {

        boolean isFullySigned = true;

        for(String jarName : signedJars.keySet()) {
            int numbSignableEntries = signedJars.get(jarName);
            boolean isSigned = false;

            for (CertInformation certInfo : certs.values()) {
                if(certInfo.isSignerOfJar(jarName)
                        && numbSignableEntries == certInfo.getNumJarEntriesSigned(jarName)) {
                    isSigned = true;
                    break;
                }
            }

            isFullySigned &= isSigned;
        }

        return isFullySigned;
    }

    @Override
    public void checkTrustWithUser(SecurityDelegate securityDelegate, JarCertVerifier jcv, JNLPFile file)
            throws LaunchException {
        List<CertPath> certPaths = buildCertPathsList(jcv);
        List<CertPath> alreadyApprovedByUser = new ArrayList<CertPath>();
        for (String jarName : jcv.getJarSignableEntries().keySet()) {
            boolean trustFoundOrApproved = false;
            for (CertPath cPathApproved : alreadyApprovedByUser) {
                jcv.setCurrentlyUsedCertPath(cPathApproved);
                CertInformation info = jcv.getCertInformation(cPathApproved);
                if (info.isSignerOfJar(jarName)
                        && alreadyApprovedByUser.contains(cPathApproved)) {
                    trustFoundOrApproved = true;
                    break;
                }
            }

            if (trustFoundOrApproved) {
                continue;
            }

            for (CertPath cPath : certPaths) {
                jcv.setCurrentlyUsedCertPath(cPath);
                CertInformation info = jcv.getCertInformation(cPath);
                if (info.isSignerOfJar(jarName)) {
                    if (info.isPublisherAlreadyTrusted()) {
                        trustFoundOrApproved = true;
                        alreadyApprovedByUser.add(cPath);
                        break;
                    }

                    AccessType dialogType;
                    if (info.isRootInCacerts() && !info.hasSigningIssues()) {
                        dialogType = AccessType.VERIFIED;
                    } else if (info.isRootInCacerts()) {
                        dialogType = AccessType.SIGNING_ERROR;
                    } else {
                        dialogType = AccessType.UNVERIFIED;
                    }

                    YesNoSandbox action = SecurityDialogs.showCertWarningDialog(
                            dialogType, file, jcv, securityDelegate);
                    if (action != null && action.toBoolean()) {
                        if (action.compareValue(Primitive.SANDBOX)) {
                            securityDelegate.setRunInSandbox();
                        }
                        alreadyApprovedByUser.add(cPath);
                        trustFoundOrApproved = true;
                        break;
                    }
                }
            }
            if (!trustFoundOrApproved) {
                throw new LaunchException(null, null, FATAL,
                        "Launch Error", "Cancelled on user request.", "");
            }
        }
    }

    /**
     * Build a list of all the CertPaths that were detected in the provided
     * JCV, placing them in the most trusted possible order.
     * @param jcv The verifier containing the CertPaths to examine.
     * @return A list of CertPaths sorted in the following order: Signers with
     *   1. Already trusted publishers
     *   2. Roots in the CA store and have no signing issues
     *   3. Roots in the CA store but have signing issues
     *   4. Everything else
     */
    public List<CertPath> buildCertPathsList(JarCertVerifier jcv) {
        List<CertPath> certPathsList = jcv.getCertsList();
        List<CertPath> returnList = new ArrayList<CertPath>();

        for (CertPath cPath : certPathsList) {
            if (!returnList.contains(cPath)
                    && jcv.getCertInformation(cPath).isPublisherAlreadyTrusted())
                returnList.add(cPath);
        }

        for (CertPath cPath : certPathsList) {
            if (!returnList.contains(cPath)
                    && jcv.getCertInformation(cPath).isRootInCacerts()
                    && !jcv.getCertInformation(cPath).hasSigningIssues())
                returnList.add(cPath);
        }

        for (CertPath cPath : certPathsList) {
            if (!returnList.contains(cPath)
                    && jcv.getCertInformation(cPath).isRootInCacerts()
                    && jcv.getCertInformation(cPath).hasSigningIssues())
                returnList.add(cPath);
        }

        for (CertPath cPath : certPathsList) {
            if (!returnList.contains(cPath))
                returnList.add(cPath);
        }

        return returnList;
    }
}
