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/*
This file is part of the iText (R) project.
Copyright (c) 1998-2021 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.signatures;
import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.io.util.DateTimeUtil;
import com.itextpdf.io.util.MessageFormatUtil;
import com.itextpdf.kernel.counter.event.IMetaInfo;
import com.itextpdf.kernel.pdf.DocumentProperties;
import com.itextpdf.kernel.pdf.PdfArray;
import com.itextpdf.kernel.pdf.PdfDictionary;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfStream;
import org.bouncycastle.cert.ocsp.BasicOCSPResp;
import org.bouncycastle.cert.ocsp.OCSPException;
import org.bouncycastle.cert.ocsp.OCSPResp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.cert.Certificate;
import java.security.cert.X509CRL;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import static com.itextpdf.signatures.LtvVerification.CertificateOption;
/**
* Verifies the signatures in an LTV document.
*/
public class LtvVerifier extends RootStoreVerifier {
/** The Logger instance */
protected static final Logger LOGGER = LoggerFactory.getLogger(LtvVerifier.class);
/** Option to specify level of verification; signing certificate only or the entire chain. */
protected CertificateOption option = CertificateOption.SIGNING_CERTIFICATE;
/** Verify root. */
protected boolean verifyRootCertificate = true;
/** A document object for the revision that is being verified. */
protected PdfDocument document;
/** The fields in the revision that is being verified. */
protected PdfAcroForm acroForm;
/** The date the revision was signed, or null for the highest revision. */
protected Date signDate;
/** The signature that covers the revision. */
protected String signatureName;
/** The PdfPKCS7 object for the signature. */
protected PdfPKCS7 pkcs7;
/** Indicates if we're working with the latest revision. */
protected boolean latestRevision = true;
/** The document security store for the revision that is being verified */
protected PdfDictionary dss;
/** Security provider to use, use null for default*/
protected String securityProviderCode = null;
/** The meta info */
protected IMetaInfo metaInfo;
private SignatureUtil sgnUtil;
/**
* Creates a VerificationData object for a PdfReader
* @param document The document we want to verify.
* @throws GeneralSecurityException if some problem with signature or security are occurred
*/
public LtvVerifier(PdfDocument document) throws GeneralSecurityException {
super(null);
initLtvVerifier(document);
}
public LtvVerifier(PdfDocument document, String securityProviderCode) throws GeneralSecurityException {
super(null);
this.securityProviderCode = securityProviderCode;
initLtvVerifier(document);
}
/**
* Sets an extra verifier.
* @param verifier the verifier to set
*/
public void setVerifier(CertificateVerifier verifier) {
this.verifier = verifier;
}
/**
* Sets the certificate option.
* @param option Either CertificateOption.SIGNING_CERTIFICATE (default) or CertificateOption.WHOLE_CHAIN
*/
public void setCertificateOption(CertificateOption option) {
this.option = option;
}
/**
* Set the verifyRootCertificate to false if you can't verify the root certificate.
*
* @param verifyRootCertificate false if you can't verify the root certificate, otherwise true
*/
public void setVerifyRootCertificate(boolean verifyRootCertificate) {
this.verifyRootCertificate = verifyRootCertificate;
}
/**
* Sets the {@link IMetaInfo} that will be used during {@link PdfDocument} creation.
*
* @param metaInfo meta info to set
*/
public void setEventCountingMetaInfo(IMetaInfo metaInfo) {
this.metaInfo = metaInfo;
}
/**
* Verifies all the document-level timestamps and all the signatures in the document.
*
* @param result a list of {@link VerificationOK} objects
* @return a list of all {@link VerificationOK} objects after verification
* @throws IOException signals that an I/O exception has occurred
* @throws GeneralSecurityException if some problems with signature or security occurred
*/
public List verify(List result) throws IOException, GeneralSecurityException {
if (result == null)
result = new ArrayList<>();
while (pkcs7 != null) {
result.addAll(verifySignature());
}
return result;
}
/**
* Verifies a document level timestamp.
*
* @return a list of {@link VerificationOK} objects
* @throws GeneralSecurityException if some problems with signature or security occurred
* @throws IOException signals that an I/O exception has occurred
*/
public List verifySignature() throws GeneralSecurityException, IOException {
LOGGER.info("Verifying signature.");
List result = new ArrayList<>();
// Get the certificate chain
Certificate[] chain = pkcs7.getSignCertificateChain();
verifyChain(chain);
// how many certificates in the chain do we need to check?
int total = 1;
if (CertificateOption.WHOLE_CHAIN.equals(option)) {
total = chain.length;
}
// loop over the certificates
X509Certificate signCert;
X509Certificate issuerCert;
for (int i = 0; i < total; ) {
// the certificate to check
signCert = (X509Certificate) chain[i++];
// its issuer
issuerCert = (X509Certificate) null;
if (i < chain.length)
issuerCert = (X509Certificate) chain[i];
// now lets verify the certificate
LOGGER.info(signCert.getSubjectDN().getName());
List list = verify(signCert, issuerCert, signDate);
if (list.size() == 0) {
try {
signCert.verify(signCert.getPublicKey());
if (latestRevision && chain.length > 1) {
list.add(new VerificationOK(signCert, this.getClass(), "Root certificate in final revision"));
}
if (list.size() == 0 && verifyRootCertificate) {
throw new GeneralSecurityException();
}
else if (chain.length > 1)
list.add(new VerificationOK(signCert, this.getClass(), "Root certificate passed without checking"));
}
catch(GeneralSecurityException e) {
throw new VerificationException(signCert, "Couldn't verify with CRL or OCSP or trusted anchor");
}
}
result.addAll(list);
}
// go to the previous revision
switchToPreviousRevision();
return result;
}
/**
* Checks the certificates in a certificate chain:
* are they valid on a specific date, and
* do they chain up correctly?
* @param chain the certificate chain
* @throws GeneralSecurityException when requested cryptographic algorithm or security provider
* is not available, if the certificate is invalid on a specific date and if the certificates
* chained up incorrectly
*/
public void verifyChain(Certificate[] chain) throws GeneralSecurityException {
// Loop over the certificates in the chain
for (int i = 0; i < chain.length; i++) {
X509Certificate cert = (X509Certificate) chain[i];
// check if the certificate was/is valid
cert.checkValidity(signDate);
// check if the previous certificate was issued by this certificate
if (i > 0)
chain[i-1].verify(chain[i].getPublicKey());
}
LOGGER.info("All certificates are valid on " + signDate.toString());
}
/**
* Verifies certificates against a list of CRLs and OCSP responses.
* @param signCert the signing certificate
* @param issuerCert the issuer's certificate
* @return a list of VerificationOK objects.
* The list will be empty if the certificate couldn't be verified.
* @throws GeneralSecurityException if some problems with signature or security occurred
* @throws IOException signals that an I/O exception has occurred
* @see com.itextpdf.signatures.RootStoreVerifier#verify(java.security.cert.X509Certificate, java.security.cert.X509Certificate, java.util.Date)
*/
public List verify(X509Certificate signCert, X509Certificate issuerCert, Date signDate) throws GeneralSecurityException, IOException {
// we'll verify agains the rootstore (if present)
RootStoreVerifier rootStoreVerifier = new RootStoreVerifier(verifier);
rootStoreVerifier.setRootStore(rootStore);
// We'll verify against a list of CRLs
CRLVerifier crlVerifier = new CRLVerifier(rootStoreVerifier, getCRLsFromDSS());
crlVerifier.setRootStore(rootStore);
crlVerifier.setOnlineCheckingAllowed(latestRevision || onlineCheckingAllowed);
// We'll verify against a list of OCSPs
OCSPVerifier ocspVerifier = new OCSPVerifier(crlVerifier, getOCSPResponsesFromDSS());
ocspVerifier.setRootStore(rootStore);
ocspVerifier.setOnlineCheckingAllowed(latestRevision || onlineCheckingAllowed);
// We verify the chain
return ocspVerifier.verify(signCert, issuerCert, signDate);
}
/**
* Switches to the previous revision.
* @throws IOException signals that an I/O exception has occurred
* @throws GeneralSecurityException if some problems with signature or security occurred
*/
public void switchToPreviousRevision() throws IOException, GeneralSecurityException {
LOGGER.info("Switching to previous revision.");
latestRevision = false;
dss = document.getCatalog().getPdfObject().getAsDictionary(PdfName.DSS);
Calendar cal = pkcs7.getTimeStampDate();
if (cal == TimestampConstants.UNDEFINED_TIMESTAMP_DATE) {
cal = pkcs7.getSignDate();
}
// TODO: get date from signature
signDate = cal.getTime();
List names = sgnUtil.getSignatureNames();
if (names.size() > 1) {
signatureName = names.get(names.size() - 2);
try (PdfReader readerTmp = new PdfReader(sgnUtil.extractRevision(signatureName))) {
document = new PdfDocument(readerTmp, new DocumentProperties().setEventCountingMetaInfo(metaInfo));
this.acroForm = PdfAcroForm.getAcroForm(document, true);
this.sgnUtil = new SignatureUtil(document);
names = sgnUtil.getSignatureNames();
signatureName = names.get(names.size() - 1);
pkcs7 = coversWholeDocument();
LOGGER.info(MessageFormatUtil.format("Checking {0}signature {1}", pkcs7.isTsp() ? "document-level timestamp " : "", signatureName));
}
}
else {
LOGGER.info("No signatures in revision");
pkcs7 = null;
}
}
/**
* Gets a list of X509CRL objects from a Document Security Store.
* @return a list of CRLs
* @throws GeneralSecurityException when requested cryptographic algorithm or security provider
* is not available
* @throws IOException signals that an I/O exception has occurred
*/
public List getCRLsFromDSS() throws GeneralSecurityException, IOException {
List crls = new ArrayList<>();
if (dss == null)
return crls;
PdfArray crlarray = dss.getAsArray(PdfName.CRLs);
if (crlarray == null)
return crls;
for (int i = 0; i < crlarray.size(); i++) {
PdfStream stream = crlarray.getAsStream(i);
crls.add((X509CRL) SignUtils.parseCrlFromStream(new ByteArrayInputStream(stream.getBytes())));
}
return crls;
}
/**
* Gets OCSP responses from the Document Security Store.
* @return a list of BasicOCSPResp objects
* @throws IOException signals that an I/O exception has occurred
* @throws GeneralSecurityException if OCSP response failed
*/
public List getOCSPResponsesFromDSS() throws IOException, GeneralSecurityException {
List ocsps = new ArrayList<>();
if (dss == null)
return ocsps;
PdfArray ocsparray = dss.getAsArray(PdfName.OCSPs);
if (ocsparray == null)
return ocsps;
for (int i = 0; i < ocsparray.size(); i++) {
PdfStream stream = ocsparray.getAsStream(i);
OCSPResp ocspResponse = new OCSPResp(stream.getBytes());
if (ocspResponse.getStatus() == 0)
try {
ocsps.add((BasicOCSPResp) ocspResponse.getResponseObject());
} catch (OCSPException e) {
throw new GeneralSecurityException(e.toString());
}
}
return ocsps;
}
protected void initLtvVerifier(PdfDocument document) throws GeneralSecurityException {
this.document = document;
this.acroForm = PdfAcroForm.getAcroForm(document, true);
this.sgnUtil = new SignatureUtil(document);
List names = sgnUtil.getSignatureNames();
signatureName = names.get(names.size() - 1);
this.signDate = DateTimeUtil.getCurrentTimeDate();
pkcs7 = coversWholeDocument();
LOGGER.info(MessageFormatUtil.format("Checking {0}signature {1}", pkcs7.isTsp() ? "document-level timestamp " : "", signatureName));
}
/**
* Checks if the signature covers the whole document
* and throws an exception if the document was altered
* @return a PdfPKCS7 object
* @throws GeneralSecurityException if some problems with signature or security occurred
*/
protected PdfPKCS7 coversWholeDocument() throws GeneralSecurityException {
PdfPKCS7 pkcs7 = sgnUtil.readSignatureData(signatureName, securityProviderCode);
if (sgnUtil.signatureCoversWholeDocument(signatureName)) {
LOGGER.info("The timestamp covers whole document.");
}
else {
throw new VerificationException((Certificate) null, "Signature doesn't cover whole document.");
}
if (pkcs7.verifySignatureIntegrityAndAuthenticity()) {
LOGGER.info("The signed document has not been modified.");
return pkcs7;
}
else {
throw new VerificationException((Certificate) null, "The document was altered after the final signature was applied.");
}
}
}
