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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 .
*/
package com.itextpdf.signatures;
import com.itextpdf.bouncycastleconnector.BouncyCastleFactoryCreator;
import com.itextpdf.commons.bouncycastle.IBouncyCastleFactory;
import com.itextpdf.commons.bouncycastle.asn1.IASN1InputStream;
import com.itextpdf.commons.bouncycastle.asn1.IASN1Primitive;
import com.itextpdf.commons.bouncycastle.asn1.IDEROctetString;
import com.itextpdf.commons.bouncycastle.asn1.ocsp.IOCSPResponse;
import com.itextpdf.commons.bouncycastle.asn1.ocsp.IOCSPResponseStatus;
import com.itextpdf.commons.bouncycastle.asn1.ocsp.IResponseBytes;
import com.itextpdf.commons.utils.MessageFormatUtil;
import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.fields.PdfFormCreator;
import com.itextpdf.io.font.PdfEncodings;
import com.itextpdf.io.source.ByteBuffer;
import com.itextpdf.kernel.pdf.CompressionConstants;
import com.itextpdf.kernel.pdf.PdfArray;
import com.itextpdf.kernel.pdf.PdfCatalog;
import com.itextpdf.kernel.pdf.PdfDeveloperExtension;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfIndirectReference;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfObject;
import com.itextpdf.kernel.pdf.PdfStream;
import com.itextpdf.kernel.pdf.PdfString;
import com.itextpdf.kernel.pdf.PdfVersion;
import com.itextpdf.signatures.exceptions.SignExceptionMessageConstant;
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 java.util.Objects;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Add verification according to PAdES-LTV (part 4).
*/
public class LtvVerification {
private static final IBouncyCastleFactory BOUNCY_CASTLE_FACTORY = BouncyCastleFactoryCreator.getFactory();
private Logger LOGGER = LoggerFactory.getLogger(LtvVerification.class);
private PdfDocument document;
private SignatureUtil sgnUtil;
private PdfAcroForm acroForm;
private Map validated = new HashMap<>();
private boolean used = false;
private String securityProviderCode = null;
/**
* 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 document The {@link PdfDocument} to apply the validation to.
*/
public LtvVerification(PdfDocument document) {
this.document = document;
this.acroForm = PdfFormCreator.getAcroForm(document, true);
this.sgnUtil = new SignatureUtil(document);
}
/**
* The verification constructor. This class should only be created with
* PdfStamper.getLtvVerification() otherwise the information will not be
* added to the Pdf.
*
* @param document The {@link PdfDocument} to apply the validation to.
* @param securityProviderCode Security provider to use
*/
public LtvVerification(PdfDocument document, String securityProviderCode) {
this(document);
this.securityProviderCode = securityProviderCode;
}
/**
* 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 options as to how many certificates to include
* @param level the validation options to include
* @param certInclude certificate inclusion options
*
* @return true if a validation was generated, false otherwise
*
* @throws GeneralSecurityException when requested cryptographic algorithm or security provider
* is not available
* @throws IOException signals that an I/O exception has occurred
*/
public boolean addVerification(String signatureName, IOcspClient ocsp, ICrlClient crl, CertificateOption certOption,
Level level, CertificateInclusion certInclude) throws IOException, GeneralSecurityException {
if (used) {
throw new IllegalStateException(SignExceptionMessageConstant.VERIFICATION_ALREADY_OUTPUT);
}
PdfPKCS7 pk = sgnUtil.readSignatureData(signatureName, securityProviderCode);
LOGGER.info("Adding verification for " + signatureName);
Certificate[] xc = pk.getCertificates();
X509Certificate cert;
X509Certificate signingCert = pk.getSigningCertificate();
ValidationData vd = new ValidationData();
for (Certificate certificate : xc) {
cert = (X509Certificate) certificate;
LOGGER.info(MessageFormatUtil.format("Certificate: {0}", BOUNCY_CASTLE_FACTORY.createX500Name(cert)));
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.size() == 0 && vd.ocsps.size() == 0) {
return false;
}
validated.put(getSignatureHashKey(signatureName), vd);
return true;
}
/**
* Adds verification to the signature.
*
* @param signatureName name of the signature
* @param ocsps collection of DER-encoded BasicOCSPResponses
* @param crls collection of DER-encoded CRLs
* @param certs collection of DER-encoded certificates
*
* @return boolean
*
* @throws IOException signals that an I/O exception has occurred
* @throws GeneralSecurityException when requested cryptographic algorithm or security provider
* is not available
*/
public boolean addVerification(String signatureName, Collection ocsps, Collection crls,
Collection certs) throws IOException, GeneralSecurityException {
if (used) {
throw new IllegalStateException(SignExceptionMessageConstant.VERIFICATION_ALREADY_OUTPUT);
}
ValidationData vd = new ValidationData();
if (ocsps != null) {
for (byte[] ocsp : ocsps) {
vd.ocsps.add(buildOCSPResponse(ocsp));
}
}
if (crls != null) {
vd.crls.addAll(crls);
}
if (certs != null) {
vd.certs.addAll(certs);
}
validated.put(getSignatureHashKey(signatureName), vd);
return true;
}
/**
* Get 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 parent certificate
*/
X509Certificate getParent(X509Certificate cert, Certificate[] certs) {
X509Certificate parent;
for (Certificate certificate : certs) {
parent = (X509Certificate) certificate;
if (!cert.getIssuerDN().equals(parent.getSubjectDN())) {
continue;
}
try {
cert.verify(parent.getPublicKey());
return parent;
} catch (Exception e) {
// do nothing
}
}
return null;
}
private static byte[] buildOCSPResponse(byte[] basicOcspResponse) throws IOException {
IDEROctetString doctet = BOUNCY_CASTLE_FACTORY.createDEROctetString(basicOcspResponse);
IOCSPResponseStatus respStatus = BOUNCY_CASTLE_FACTORY.createOCSPResponseStatus(
BOUNCY_CASTLE_FACTORY.createOCSPRespBuilderInstance().getSuccessful());
IResponseBytes responseBytes = BOUNCY_CASTLE_FACTORY.createResponseBytes(
BOUNCY_CASTLE_FACTORY.createOCSPObjectIdentifiers().getIdPkixOcspBasic(), doctet);
IOCSPResponse ocspResponse = BOUNCY_CASTLE_FACTORY.createOCSPResponse(respStatus, responseBytes);
return BOUNCY_CASTLE_FACTORY.createOCSPResp(ocspResponse).getEncoded();
}
private PdfName getSignatureHashKey(String signatureName) throws NoSuchAlgorithmException, IOException {
PdfSignature sig = sgnUtil.getSignature(signatureName);
PdfString contents = sig.getContents();
byte[] bc = PdfEncodings.convertToBytes(contents.getValue(), null);
byte[] bt = null;
if (PdfName.ETSI_RFC3161.equals(sig.getSubFilter())) {
try (IASN1InputStream din = BOUNCY_CASTLE_FACTORY.createASN1InputStream(new ByteArrayInputStream(bc))) {
IASN1Primitive pkcs = din.readObject();
bc = pkcs.getEncoded();
}
}
bt = hashBytesSha1(bc);
return new PdfName(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.
*/
public void merge() {
if (used || validated.size() == 0) {
return;
}
used = true;
PdfDictionary catalog = document.getCatalog().getPdfObject();
PdfObject dss = catalog.get(PdfName.DSS);
if (dss == null) {
createDss();
} else {
updateDss();
}
}
private void updateDss() {
PdfDictionary catalog = document.getCatalog().getPdfObject();
catalog.setModified();
PdfDictionary dss = catalog.getAsDictionary(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.getAsDictionary(PdfName.VRI);
// delete old validations
if (vrim != null) {
for (PdfName n : vrim.keySet()) {
if (validated.containsKey(n)) {
PdfDictionary vri = vrim.getAsDictionary(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();
}
if (vrim == null) {
vrim = new PdfDictionary();
}
outputDss(dss, vrim, ocsps, crls, certs);
}
private static void deleteOldReferences(PdfArray all, PdfArray toDelete) {
if (all == null || toDelete == null) {
return;
}
for (PdfObject pi : toDelete) {
final PdfIndirectReference pir = pi.getIndirectReference();
for (int i = 0; i < all.size(); i++) {
final PdfIndirectReference pod = all.get(i).getIndirectReference();
if (Objects.equals(pir, pod)) {
all.remove(i);
i--;
}
}
}
}
private void createDss() {
outputDss(new PdfDictionary(), new PdfDictionary(), new PdfArray(), new PdfArray(), new PdfArray());
}
private void outputDss(PdfDictionary dss, PdfDictionary vrim, PdfArray ocsps, PdfArray crls, PdfArray certs) {
PdfCatalog catalog = document.getCatalog();
if (document.getPdfVersion().compareTo(PdfVersion.PDF_2_0) < 0) {
catalog.addDeveloperExtension(PdfDeveloperExtension.ESIC_1_7_EXTENSIONLEVEL5);
}
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.setCompressionLevel(CompressionConstants.DEFAULT_COMPRESSION);
ps.makeIndirect(document);
crl.add(ps);
crls.add(ps);
crls.setModified();
}
for (byte[] b : validated.get(vkey).ocsps) {
PdfStream ps = new PdfStream(b);
ps.setCompressionLevel(CompressionConstants.DEFAULT_COMPRESSION);
ocsp.add(ps);
ocsps.add(ps);
ocsps.setModified();
}
for (byte[] b : validated.get(vkey).certs) {
PdfStream ps = new PdfStream(b);
ps.setCompressionLevel(CompressionConstants.DEFAULT_COMPRESSION);
ps.makeIndirect(document);
cert.add(ps);
certs.add(ps);
certs.setModified();
}
if (ocsp.size() > 0) {
ocsp.makeIndirect(document);
vri.put(PdfName.OCSP, ocsp);
}
if (crl.size() > 0) {
crl.makeIndirect(document);
vri.put(PdfName.CRL, crl);
}
if (cert.size() > 0) {
cert.makeIndirect(document);
vri.put(PdfName.Cert, cert);
}
vri.makeIndirect(document);
vrim.put(vkey, vri);
}
vrim.makeIndirect(document);
vrim.setModified();
dss.put(PdfName.VRI, vrim);
if (ocsps.size() > 0) {
ocsps.makeIndirect(document);
dss.put(PdfName.OCSPs, ocsps);
}
if (crls.size() > 0) {
crls.makeIndirect(document);
dss.put(PdfName.CRLs, crls);
}
if (certs.size() > 0) {
certs.makeIndirect(document);
dss.put(PdfName.Certs, certs);
}
dss.makeIndirect(document);
dss.setModified();
catalog.put(PdfName.DSS, dss);
}
private static class ValidationData {
public List crls = new ArrayList<>();
public List ocsps = new ArrayList<>();
public List certs = new ArrayList<>();
}
/**
* Converts an array of bytes to a String of hexadecimal values
*
* @param bytes a byte array
*
* @return the same bytes expressed as hexadecimal values
*/
public static String convertToHex(byte[] bytes) {
ByteBuffer buf = new ByteBuffer();
for (byte b : bytes) {
buf.appendHex(b);
}
return PdfEncodings.convertToString(buf.toByteArray(), null).toUpperCase();
}
}
