eu.europa.esig.dss.cades.validation.CMSDocumentValidator.java Source code

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Here is the source code for eu.europa.esig.dss.cades.validation.CMSDocumentValidator.java

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/**
 * DSS - Digital Signature Services
 * Copyright (C) 2015 European Commission, provided under the CEF programme
 *
 * This file is part of the "DSS - Digital Signature Services" project.
 *
 * 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 eu.europa.esig.dss.cades.validation;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.util.encoders.Base64;

import eu.europa.esig.dss.DSSDocument;
import eu.europa.esig.dss.DSSException;
import eu.europa.esig.dss.DSSUtils;
import eu.europa.esig.dss.InMemoryDocument;
import eu.europa.esig.dss.cades.CMSUtils;
import eu.europa.esig.dss.validation.AdvancedSignature;
import eu.europa.esig.dss.validation.SignedDocumentValidator;

/**
 * Validation of CMS document
 *
 */
public class CMSDocumentValidator extends SignedDocumentValidator {

    protected CMSSignedData cmsSignedData;
    private static final String BASE64_REGEX = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";

    /**
     * This constructor is used with {@code TimeStampToken}.
     */
    public CMSDocumentValidator() {
        super(new CAdESSignatureScopeFinder());
    }

    /**
     * The default constructor for {@code CMSDocumentValidator}.
     *
     * @param cmsSignedData
     *            pkcs7-signature(s)
     */
    public CMSDocumentValidator(final CMSSignedData cmsSignedData) {

        this();
        this.cmsSignedData = cmsSignedData;
    }

    /**
     * The default constructor for {@code CMSDocumentValidator}.
     *
     * @param document
     *            document to validate (with the signature(s))
     * @throws DSSException
     */
    public CMSDocumentValidator(final DSSDocument document) throws DSSException {

        this();
        this.document = document;
        InputStream inputStream = null;
        try {

            inputStream = document.openStream();
            if (DSSUtils.available(inputStream) > 0) {
                this.cmsSignedData = new CMSSignedData(inputStream);
            }
        } catch (CMSException e) {
            throw new DSSException("Not a valid CAdES file", e);
        } finally {
            IOUtils.closeQuietly(inputStream);
        }
    }

    @Override
    public boolean isSupported(DSSDocument dssDocument) {
        int headerLength = 500;
        byte[] preamble = new byte[headerLength];
        DSSUtils.readToArray(dssDocument, headerLength, preamble);
        final String preambleString = new String(preamble);
        if (preambleString.getBytes()[0] == 0x30) {
            return true;
        }
        return false;
    }

    @Override
    public List<AdvancedSignature> getSignatures() {
        List<AdvancedSignature> signatures = new ArrayList<AdvancedSignature>();
        if (cmsSignedData != null) {

            for (final Object signerInformationObject : cmsSignedData.getSignerInfos().getSigners()) {

                final SignerInformation signerInformation = (SignerInformation) signerInformationObject;
                final CAdESSignature cadesSignature = new CAdESSignature(cmsSignedData, signerInformation,
                        validationCertPool);
                cadesSignature.setDetachedContents(detachedContents);
                cadesSignature.setProvidedSigningCertificateToken(providedSigningCertificateToken);
                signatures.add(cadesSignature);
            }
        }
        return signatures;
    }

    @Override
    public DSSDocument getOriginalDocument(final String signatureId) throws DSSException {
        if (StringUtils.isBlank(signatureId)) {
            throw new NullPointerException("signatureId");
        }
        for (final Object signerInformationObject : cmsSignedData.getSignerInfos().getSigners()) {

            final SignerInformation signerInformation = (SignerInformation) signerInformationObject;
            final CAdESSignature cadesSignature = new CAdESSignature(cmsSignedData, signerInformation,
                    validationCertPool);
            cadesSignature.setDetachedContents(detachedContents);
            cadesSignature.setProvidedSigningCertificateToken(providedSigningCertificateToken);
            if (cadesSignature.getId().equals(signatureId)) {
                if (!cadesSignature.getDetachedContents().isEmpty()) {
                    throw new DSSException("The signature must be an enveloping signature");
                }
                byte[] content = CMSUtils.getSignedContent(cmsSignedData.getSignedContent());
                content = isBase64Encoded(content) ? Base64.decode(content) : content;
                return new InMemoryDocument(content);
            }
        }
        throw new DSSException("The signature with the given id was not found!");
    }

    private boolean isBase64Encoded(byte[] array) {
        return isBase64Encoded(new String(array));
    }

    private boolean isBase64Encoded(String text) {
        Pattern pattern = Pattern.compile(BASE64_REGEX);
        Matcher matcher = pattern.matcher(text);
        return matcher.matches();
    }
}