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/*
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* 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 or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf.security;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Enumerated;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.ocsp.OCSPObjectIdentifiers;
import com.itextpdf.text.Utilities;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.log.Logger;
import com.itextpdf.text.log.LoggerFactory;
import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.PRIndirectReference;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDeveloperExtension;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfIndirectReference;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfStream;
import com.itextpdf.text.pdf.PdfString;
import com.itextpdf.text.pdf.PdfWriter;
/**
* Add verification according to PAdES-LTV (part 4)
* @author Paulo Soares
*/
public class LtvVerification {
private Logger LOGGER = LoggerFactory.getLogger(LtvVerification.class);
private PdfStamper stp;
private PdfWriter writer;
private PdfReader reader;
private AcroFields acroFields;
private Map validated = new HashMap();
private boolean used = false;
/**
* What type of verification to include
*/
public enum Level {
/**
* Include only OCSP
*/
OCSP,
/**
* Include only CRL
*/
CRL,
/**
* Include both OCSP and CRL
*/
OCSP_CRL,
/**
* Include CRL only if OCSP can't be read
*/
OCSP_OPTIONAL_CRL
}
/**
* Options for how many certificates to include
*/
public enum CertificateOption {
/**
* Include verification just for the signing certificate
*/
SIGNING_CERTIFICATE,
/**
* Include verification for the whole chain of certificates
*/
WHOLE_CHAIN
}
/**
* Certificate inclusion in the DSS and VRI dictionaries in the CERT and CERTS
* keys
*/
public enum CertificateInclusion {
/**
* Include certificates in the DSS and VRI dictionaries
*/
YES,
/**
* Do not include certificates in the DSS and VRI dictionaries
*/
NO
}
/**
* The verification constructor. This class should only be created with
* PdfStamper.getLtvVerification() otherwise the information will not be
* added to the Pdf.
* @param stp the PdfStamper to apply the validation to
*/
public LtvVerification(PdfStamper stp) {
this.stp = stp;
writer = stp.getWriter();
reader = stp.getReader();
acroFields = stp.getAcroFields();
}
/**
* Add verification for a particular signature
* @param signatureName the signature to validate (it may be a timestamp)
* @param ocsp the interface to get the OCSP
* @param crl the interface to get the CRL
* @param certOption
* @param level the validation options to include
* @param certInclude
* @return true if a validation was generated, false otherwise
* @throws GeneralSecurityException
* @throws IOException
*/
public boolean addVerification(String signatureName, OcspClient ocsp, CrlClient crl, CertificateOption certOption, Level level, CertificateInclusion certInclude) throws IOException, GeneralSecurityException {
if (used)
throw new IllegalStateException(MessageLocalization.getComposedMessage("verification.already.output"));
PdfPKCS7 pk = acroFields.verifySignature(signatureName);
LOGGER.info("Adding verification for " + signatureName);
Certificate[] xc = pk.getCertificates();
X509Certificate cert;
X509Certificate signingCert = pk.getSigningCertificate();
ValidationData vd = new ValidationData();
for (int k = 0; k < xc.length; ++k) {
cert = (X509Certificate)xc[k];
LOGGER.info("Certificate: " + cert.getSubjectDN());
if (certOption == CertificateOption.SIGNING_CERTIFICATE
&& !cert.equals(signingCert)) {
continue;
}
byte[] ocspEnc = null;
if (ocsp != null && level != Level.CRL) {
ocspEnc = ocsp.getEncoded(cert, getParent(cert, xc), null);
if (ocspEnc != null) {
vd.ocsps.add(buildOCSPResponse(ocspEnc));
LOGGER.info("OCSP added");
}
}
if (crl != null && (level == Level.CRL || level == Level.OCSP_CRL || (level == Level.OCSP_OPTIONAL_CRL && ocspEnc == null))) {
Collection cims = crl.getEncoded(cert, null);
if (cims != null) {
for (byte[] cim : cims) {
boolean dup = false;
for (byte[] b : vd.crls) {
if (Arrays.equals(b, cim)) {
dup = true;
break;
}
}
if (!dup) {
vd.crls.add(cim);
LOGGER.info("CRL added");
}
}
}
}
if (certInclude == CertificateInclusion.YES) {
vd.certs.add(cert.getEncoded());
}
}
if (vd.crls.isEmpty() && vd.ocsps.isEmpty())
return false;
validated.put(getSignatureHashKey(signatureName), vd);
return true;
}
/**
* Returns the issuing certificate for a child certificate.
* @param cert the certificate for which we search the parent
* @param certs an array with certificates that contains the parent
* @return the partent certificate
*/
private X509Certificate getParent(X509Certificate cert, Certificate[] certs) {
X509Certificate parent;
for (int i = 0; i < certs.length; i++) {
parent = (X509Certificate)certs[i];
if (!cert.getIssuerDN().equals(parent.getSubjectDN()))
continue;
try {
cert.verify(parent.getPublicKey());
return parent;
} catch (Exception e) {
// do nothing
}
}
return null;
}
/**
*
* Alternative addVerification.
* I assume that inputs are deduplicated.
*
* @throws IOException
* @throws GeneralSecurityException
*
*/
public boolean addVerification(String signatureName, Collection ocsps, Collection crls, Collection certs) throws IOException, GeneralSecurityException {
if (used)
throw new IllegalStateException(MessageLocalization.getComposedMessage("verification.already.output"));
ValidationData vd = new ValidationData();
if (ocsps != null) {
for (byte[] ocsp : ocsps) {
vd.ocsps.add(buildOCSPResponse(ocsp));
}
}
if (crls != null) {
for (byte[] crl : crls) {
vd.crls.add(crl);
}
}
if (certs != null) {
for (byte[] cert : certs) {
vd.certs.add(cert);
}
}
validated.put(getSignatureHashKey(signatureName), vd);
return true;
}
private static byte[] buildOCSPResponse(byte[] BasicOCSPResponse) throws IOException {
DEROctetString doctet = new DEROctetString(BasicOCSPResponse);
ASN1EncodableVector v2 = new ASN1EncodableVector();
v2.add(OCSPObjectIdentifiers.id_pkix_ocsp_basic);
v2.add(doctet);
ASN1Enumerated den = new ASN1Enumerated(0);
ASN1EncodableVector v3 = new ASN1EncodableVector();
v3.add(den);
v3.add(new DERTaggedObject(true, 0, new DERSequence(v2)));
DERSequence seq = new DERSequence(v3);
return seq.getEncoded();
}
private PdfName getSignatureHashKey(String signatureName) throws NoSuchAlgorithmException, IOException {
PdfDictionary dic = acroFields.getSignatureDictionary(signatureName);
PdfString contents = dic.getAsString(PdfName.CONTENTS);
byte[] bc = contents.getOriginalBytes();
byte[] bt = null;
if (PdfName.ETSI_RFC3161.equals(PdfReader.getPdfObject(dic.get(PdfName.SUBFILTER)))) {
ASN1InputStream din = new ASN1InputStream(new ByteArrayInputStream(bc));
ASN1Primitive pkcs = din.readObject();
bc = pkcs.getEncoded();
}
bt = hashBytesSha1(bc);
return new PdfName(Utilities.convertToHex(bt));
}
private static byte[] hashBytesSha1(byte[] b) throws NoSuchAlgorithmException {
MessageDigest sh = MessageDigest.getInstance("SHA1");
return sh.digest(b);
}
/**
* Merges the validation with any validation already in the document or creates
* a new one.
* @throws IOException
*/
public void merge() throws IOException {
if (used || validated.isEmpty())
return;
used = true;
PdfDictionary catalog = reader.getCatalog();
PdfObject dss = catalog.get(PdfName.DSS);
if (dss == null)
createDss();
else
updateDss();
}
private void updateDss() throws IOException {
PdfDictionary catalog = reader.getCatalog();
stp.markUsed(catalog);
PdfDictionary dss = catalog.getAsDict(PdfName.DSS);
PdfArray ocsps = dss.getAsArray(PdfName.OCSPS);
PdfArray crls = dss.getAsArray(PdfName.CRLS);
PdfArray certs = dss.getAsArray(PdfName.CERTS);
dss.remove(PdfName.OCSPS);
dss.remove(PdfName.CRLS);
dss.remove(PdfName.CERTS);
PdfDictionary vrim = dss.getAsDict(PdfName.VRI);
//delete old validations
if (vrim != null) {
for (PdfName n : vrim.getKeys()) {
if (validated.containsKey(n)) {
PdfDictionary vri = vrim.getAsDict(n);
if (vri != null) {
deleteOldReferences(ocsps, vri.getAsArray(PdfName.OCSP));
deleteOldReferences(crls, vri.getAsArray(PdfName.CRL));
deleteOldReferences(certs, vri.getAsArray(PdfName.CERT));
}
}
}
}
if (ocsps == null)
ocsps = new PdfArray();
if (crls == null)
crls = new PdfArray();
if (certs == null)
certs = new PdfArray();
outputDss(dss, vrim, ocsps, crls, certs);
}
private static void deleteOldReferences(PdfArray all, PdfArray toDelete) {
if (all == null || toDelete == null)
return;
for (PdfObject pi : toDelete) {
if (!pi.isIndirect())
continue;
PRIndirectReference pir = (PRIndirectReference)pi;
for (int k = 0; k < all.size(); ++k) {
PdfObject po = all.getPdfObject(k);
if (!po.isIndirect())
continue;
PRIndirectReference pod = (PRIndirectReference)po;
if (pir.getNumber() == pod.getNumber()) {
all.remove(k);
--k;
}
}
}
}
private void createDss() throws IOException {
outputDss(new PdfDictionary(), new PdfDictionary(), new PdfArray(), new PdfArray(), new PdfArray());
}
private void outputDss(PdfDictionary dss, PdfDictionary vrim, PdfArray ocsps, PdfArray crls, PdfArray certs) throws IOException {
writer.addDeveloperExtension(PdfDeveloperExtension.ESIC_1_7_EXTENSIONLEVEL5);
PdfDictionary catalog = reader.getCatalog();
stp.markUsed(catalog);
for (PdfName vkey : validated.keySet()) {
PdfArray ocsp = new PdfArray();
PdfArray crl = new PdfArray();
PdfArray cert = new PdfArray();
PdfDictionary vri = new PdfDictionary();
for (byte[] b : validated.get(vkey).crls) {
PdfStream ps = new PdfStream(b);
ps.flateCompress();
PdfIndirectReference iref = writer.addToBody(ps, false).getIndirectReference();
crl.add(iref);
crls.add(iref);
}
for (byte[] b : validated.get(vkey).ocsps) {
PdfStream ps = new PdfStream(b);
ps.flateCompress();
PdfIndirectReference iref = writer.addToBody(ps, false).getIndirectReference();
ocsp.add(iref);
ocsps.add(iref);
}
for (byte[] b : validated.get(vkey).certs) {
PdfStream ps = new PdfStream(b);
ps.flateCompress();
PdfIndirectReference iref = writer.addToBody(ps, false).getIndirectReference();
cert.add(iref);
certs.add(iref);
}
if (ocsp.size() > 0)
vri.put(PdfName.OCSP, writer.addToBody(ocsp, false).getIndirectReference());
if (crl.size() > 0)
vri.put(PdfName.CRL, writer.addToBody(crl, false).getIndirectReference());
if (cert.size() > 0)
vri.put(PdfName.CERT, writer.addToBody(cert, false).getIndirectReference());
vrim.put(vkey, writer.addToBody(vri, false).getIndirectReference());
}
dss.put(PdfName.VRI, writer.addToBody(vrim, false).getIndirectReference());
if (ocsps.size() > 0)
dss.put(PdfName.OCSPS, writer.addToBody(ocsps, false).getIndirectReference());
if (crls.size() > 0)
dss.put(PdfName.CRLS, writer.addToBody(crls, false).getIndirectReference());
if (certs.size() > 0)
dss.put(PdfName.CERTS, writer.addToBody(certs, false).getIndirectReference());
catalog.put(PdfName.DSS, writer.addToBody(dss, false).getIndirectReference());
}
private static class ValidationData {
public List crls = new ArrayList();
public List ocsps = new ArrayList();
public List certs = new ArrayList();
}
}
