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DSS Document contains the code for the creation and validation of XAdES, CAdES, PAdES and ASiC signatures.
/**
* 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.validation;
import eu.europa.esig.dss.spi.x509.CertificateReorderer;
import eu.europa.esig.dss.enumerations.RevocationReason;
import eu.europa.esig.dss.model.x509.CertificateToken;
import eu.europa.esig.dss.model.x509.Token;
import eu.europa.esig.dss.model.x509.X500PrincipalHelper;
import eu.europa.esig.dss.model.x509.revocation.crl.CRL;
import eu.europa.esig.dss.model.x509.revocation.ocsp.OCSP;
import eu.europa.esig.dss.spi.CertificateExtensionsUtils;
import eu.europa.esig.dss.spi.DSSUtils;
import eu.europa.esig.dss.spi.x509.AlternateUrlsSourceAdapter;
import eu.europa.esig.dss.spi.x509.CandidatesForSigningCertificate;
import eu.europa.esig.dss.spi.x509.CertificateRef;
import eu.europa.esig.dss.spi.x509.CertificateSource;
import eu.europa.esig.dss.spi.x509.CertificateValidity;
import eu.europa.esig.dss.spi.x509.CommonTrustedCertificateSource;
import eu.europa.esig.dss.spi.x509.ListCertificateSource;
import eu.europa.esig.dss.spi.x509.ResponderId;
import eu.europa.esig.dss.spi.x509.TokenIssuerSelector;
import eu.europa.esig.dss.spi.x509.aia.AIASource;
import eu.europa.esig.dss.spi.x509.revocation.ListRevocationSource;
import eu.europa.esig.dss.spi.x509.revocation.OfflineRevocationSource;
import eu.europa.esig.dss.spi.x509.revocation.RevocationCertificateSource;
import eu.europa.esig.dss.spi.x509.revocation.RevocationSource;
import eu.europa.esig.dss.spi.x509.revocation.RevocationSourceAlternateUrlsSupport;
import eu.europa.esig.dss.spi.x509.revocation.RevocationToken;
import eu.europa.esig.dss.spi.x509.revocation.ocsp.OCSPToken;
import eu.europa.esig.dss.utils.Utils;
import eu.europa.esig.dss.validation.evidencerecord.EvidenceRecord;
import eu.europa.esig.dss.validation.status.RevocationFreshnessStatus;
import eu.europa.esig.dss.validation.status.SignatureStatus;
import eu.europa.esig.dss.validation.status.TokenStatus;
import eu.europa.esig.dss.spi.x509.tsp.TimestampToken;
import eu.europa.esig.dss.spi.x509.tsp.TimestampedReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
/**
* During the validation of a signature, the software retrieves different X509 artifacts like Certificate, CRL and OCSP
* Response. The SignatureValidationContext is a "cache" for
* one validation request that contains every object retrieved so far.
*
*/
public class SignatureValidationContext implements ValidationContext {
private static final Logger LOG = LoggerFactory.getLogger(SignatureValidationContext.class);
/**
* A set of certificates to process
*/
private final Set processedCertificates = new HashSet<>();
/**
* A set of revocation data to process
*/
private final Set> processedRevocations = new HashSet<>();
/**
* A set of timestamps to process
*/
private final Set processedTimestamps = new HashSet<>();
/**
* The CertificateVerifier to use
*/
private CertificateVerifier certificateVerifier;
/**
* Used to access certificate by AIA.
*/
private AIASource aiaSource;
/** Map of tokens defining if they have been processed yet */
private final Map tokensToProcess = new HashMap<>();
/** The best-signature-time for b-level certificate chain */
private final Map bestSignatureTimeCertChainDates = new HashMap<>();
/** The last usage of a timestamp's certificate tokens */
private final Map lastTimestampCertChainDates = new HashMap<>();
/** A map of token IDs and their corresponding POE times */
private final Map> poeTimes = new HashMap<>();
/** Cached map of tokens and their {@code CertificateToken} issuers */
private final Map tokenIssuerMap = new HashMap<>();
/** Certificates from the document */
private final ListCertificateSource documentCertificateSource = new ListCertificateSource();
/** CRLs from the document */
private final ListRevocationSource documentCRLSource = new ListRevocationSource<>();
/** OCSP from the document */
private final ListRevocationSource documentOCSPSource = new ListRevocationSource<>();
/** Certificates collected from AIA */
private final ListCertificateSource aiaCertificateSources = new ListCertificateSource();
/** Certificates collected from revocation tokens */
private final ListCertificateSource revocationCertificateSources = new ListCertificateSource();
/** External OCSP source */
private RevocationSource remoteOCSPSource;
/** External CRL source */
private RevocationSource remoteCRLSource;
/** Used to build a strategy deciding how to retrieve a revocation data (e.g. CRL or OCSP) */
private RevocationDataLoadingStrategyFactory revocationDataLoadingStrategyFactory;
/** This class is used to verify the validity (i.e. consistency) of a revocation data */
private RevocationDataVerifier revocationDataVerifier;
/** Defines whether a revocation data still shall be returned, when validation of obtained revocation tokens failed */
private boolean revocationFallback;
/** External trusted certificate sources */
private ListCertificateSource trustedCertSources;
/** External adjunct certificate sources */
private ListCertificateSource adjunctCertSources;
/**
* This variable set the behavior to follow for revocation retrieving in case of
* untrusted certificate chains.
*/
private boolean checkRevocationForUntrustedChains;
/**
* This variable indicates whether a POE should be extracted from timestamps
* with certificate chains from untrusted sources.
*/
private boolean extractPOEFromUntrustedChains;
/**
* This is the time at what the validation is carried out. It is used only for test purpose.
*/
protected Date currentTime = new Date();
/**
* Default constructor instantiating object with null or empty values and current time
*/
public SignatureValidationContext() {
// empty
}
/**
* @param certificateVerifier
* The certificate verifier (eg: using the TSL as list of trusted certificates).
*/
@Override
public void initialize(final CertificateVerifier certificateVerifier) {
Objects.requireNonNull(certificateVerifier, "CertificateVerifier cannot be null!");
this.certificateVerifier = certificateVerifier;
this.remoteCRLSource = certificateVerifier.getCrlSource();
this.remoteOCSPSource = certificateVerifier.getOcspSource();
this.aiaSource = certificateVerifier.getAIASource();
this.adjunctCertSources = certificateVerifier.getAdjunctCertSources();
this.trustedCertSources = certificateVerifier.getTrustedCertSources();
this.checkRevocationForUntrustedChains = certificateVerifier.isCheckRevocationForUntrustedChains();
this.extractPOEFromUntrustedChains = certificateVerifier.isExtractPOEFromUntrustedChains();
this.revocationDataLoadingStrategyFactory = certificateVerifier.getRevocationDataLoadingStrategyFactory();
this.revocationDataVerifier = certificateVerifier.getRevocationDataVerifier();
this.revocationDataVerifier.setTrustedCertificateSource(trustedCertSources);
this.revocationFallback = certificateVerifier.isRevocationFallback();
}
@Override
public void addSignatureForVerification(final AdvancedSignature signature) {
addDocumentCertificateSource(signature.getCertificateSource());
addDocumentCRLSource(signature.getCRLSource());
addDocumentOCSPSource(signature.getOCSPSource());
registerPOE(signature.getId(), currentTime);
// Add resolved certificates
CertificateToken signingCertificate = signature.getSigningCertificateToken();
if (signingCertificate != null) {
addCertificateTokenForVerification(signingCertificate);
} else {
List certificateValidities = signature.getCandidatesForSigningCertificate().getCertificateValidityList();
if (Utils.isCollectionNotEmpty(certificateValidities)) {
for (CertificateValidity certificateValidity : certificateValidities) {
if (certificateValidity.isValid() && certificateValidity.getCertificateToken() != null) {
addCertificateTokenForVerification(certificateValidity.getCertificateToken());
}
}
}
}
List timestamps = signature.getAllTimestamps();
prepareTimestamps(timestamps);
List allEvidenceRecords = signature.getAllEvidenceRecords();
for (EvidenceRecord evidenceRecord : allEvidenceRecords) {
addEvidenceRecordForVerification(evidenceRecord);
}
registerBestSignatureTime(signature); // to be done after timestamp POE extraction
List counterSignatures = signature.getCounterSignatures();
prepareCounterSignatures(counterSignatures);
}
@Override
public void addDocumentCertificateSource(CertificateSource certificateSource) {
addCertificateSource(documentCertificateSource, certificateSource);
}
@Override
public void addDocumentCertificateSource(ListCertificateSource listCertificateSource) {
for (CertificateSource certificateSource : listCertificateSource.getSources()) {
addDocumentCertificateSource(certificateSource);
}
}
/**
* Adds {@code certificateSourceToAdd} to the given {@code listCertificateSource}
*
* @param listCertificateSource {@link ListCertificateSource} to enrich
* @param certificateSourceToAdd {@link CertificateSource} to add
*/
private void addCertificateSource(ListCertificateSource listCertificateSource, CertificateSource certificateSourceToAdd) {
listCertificateSource.add(certificateSourceToAdd);
// add all existing equivalent certificates for the validation
ListCertificateSource allCertificateSources = getAllCertificateSources();
for (CertificateToken certificateToken : certificateSourceToAdd.getCertificates()) {
final Set equivalentCertificates = allCertificateSources.getByPublicKey(certificateToken.getPublicKey());
for (CertificateToken equivalentCertificate : equivalentCertificates) {
if (!certificateToken.getDSSIdAsString().equals(equivalentCertificate.getDSSIdAsString())) {
addCertificateTokenForVerification(certificateToken);
}
}
}
}
@Override
public void addDocumentCRLSource(OfflineRevocationSource crlSource) {
documentCRLSource.add(crlSource);
}
@Override
public void addDocumentCRLSource(ListRevocationSource crlSource) {
documentCRLSource.addAll(crlSource);
}
@Override
public void addDocumentOCSPSource(OfflineRevocationSource ocspSource) {
documentOCSPSource.add(ocspSource);
}
@Override
public void addDocumentOCSPSource(ListRevocationSource ocspSource) {
documentOCSPSource.addAll(ocspSource);
}
private void prepareTimestamps(final List timestampTokens) {
for (final TimestampToken timestampToken : timestampTokens) {
addTimestampTokenForVerification(timestampToken);
}
}
private void registerBestSignatureTime(AdvancedSignature signature) {
CertificateToken signingCertificate = signature.getSigningCertificateToken();
if (signingCertificate != null) {
// shall not return null
Date bestSignatureTime = getBestSignatureTime(signature);
if (bestSignatureTime == null) {
bestSignatureTime = currentTime;
}
List certificateChain = toCertificateTokenChain(getCertChain(signingCertificate));
for (CertificateToken cert : certificateChain) {
Date certBestSignatureTime = bestSignatureTimeCertChainDates.get(cert);
// use the latest obtained best-signature-time, in order to be able to validate the newly created signatures
if (certBestSignatureTime == null || bestSignatureTime.after(certBestSignatureTime)) {
bestSignatureTimeCertChainDates.put(cert, bestSignatureTime);
}
}
}
}
private Date getBestSignatureTime(AdvancedSignature signature) {
Date bestSignatureTime = null;
for (POE poe : poeTimes.get(signature.getId())) {
if (bestSignatureTime == null || bestSignatureTime.after(poe.getTime())) {
bestSignatureTime = poe.getTime();
}
}
return bestSignatureTime;
}
private void prepareCounterSignatures(final List counterSignatures) {
for (AdvancedSignature counterSignature : counterSignatures) {
addSignatureForVerification(counterSignature);
}
}
@Override
public Date getCurrentTime() {
return currentTime;
}
@Override
public void setCurrentTime(final Date currentTime) {
Objects.requireNonNull(currentTime);
this.currentTime = currentTime;
}
/**
* This method returns a token to verify. If there is no more tokens to verify null is returned.
*
* @return token to verify or null
*/
private Token getNotYetVerifiedToken() {
synchronized (tokensToProcess) {
for (final Entry entry : tokensToProcess.entrySet()) {
if (entry.getValue() == null) {
entry.setValue(true);
return entry.getKey();
}
}
return null;
}
}
/**
* This method returns a timestamp token to verify. If there is no more tokens to verify null is returned.
*
* @return token to verify or null
*/
private TimestampToken getNotYetVerifiedTimestamp() {
synchronized (tokensToProcess) {
for (final Entry entry : tokensToProcess.entrySet()) {
if (entry.getValue() == null && entry.getKey() instanceof TimestampToken) {
entry.setValue(true);
return (TimestampToken) entry.getKey();
}
}
return null;
}
}
private Map> getOrderedCertificateChains() {
final CertificateReorderer order = new CertificateReorderer(processedCertificates);
return order.getOrderedCertificateChains();
}
/**
* This method builds the complete certificate chain from the given token.
*
* @param token
* the token for which the certificate chain must be obtained.
* @return the built certificate chain
*/
private List getCertChain(final Token token) {
List chain = new LinkedList<>();
Token issuerCertificateToken = token;
do {
chain.add(issuerCertificateToken);
issuerCertificateToken = getIssuer(issuerCertificateToken);
} while (issuerCertificateToken != null && !chain.contains(issuerCertificateToken));
return chain;
}
private CertificateToken getIssuer(final Token token) {
// Return cached value
CertificateToken issuerCertificateToken = getIssuerFromProcessedCertificates(token);
if (issuerCertificateToken != null) {
return issuerCertificateToken;
}
// Find issuer candidates from a particular certificate source
Set candidates = Collections.emptySet();
// Avoid repeating over stateless sources
if (!tokenIssuerMap.containsKey(token)) {
if (token instanceof OCSPToken) {
candidates = getIssuersFromSource(token, ((OCSPToken) token).getCertificateSource());
}
if (token instanceof TimestampToken) {
candidates = getIssuersFromSource(token, ((TimestampToken) token).getCertificateSource());
}
// Find issuer candidates from document sources
if (Utils.isCollectionEmpty(candidates)) {
candidates = getIssuersFromSources(token, documentCertificateSource);
}
}
// Find issuer candidates from all sources
ListCertificateSource allCertificateSources = getAllCertificateSources();
if (Utils.isCollectionEmpty(candidates)) {
candidates = getIssuersFromSources(token, allCertificateSources);
}
// Find issuer from provided certificate tokens
if (Utils.isCollectionEmpty(candidates)) {
candidates = processedCertificates;
}
issuerCertificateToken = new TokenIssuerSelector(token, candidates).getIssuer();
// Request AIA only when no issuer has been found yet
if (issuerCertificateToken == null && token instanceof CertificateToken && aiaSource != null &&
!tokenIssuerMap.containsKey(token)) {
final AIACertificateSource aiaCertificateSource = new AIACertificateSource((CertificateToken) token, aiaSource);
issuerCertificateToken = aiaCertificateSource.getIssuerFromAIA();
addCertificateSource(aiaCertificateSources, aiaCertificateSource);
}
if (issuerCertificateToken == null && token instanceof OCSPToken) {
issuerCertificateToken = getOCSPIssuer((OCSPToken) token, allCertificateSources);
}
if (issuerCertificateToken == null && token instanceof TimestampToken) {
issuerCertificateToken = getTSACertificate((TimestampToken) token, allCertificateSources);
}
if (issuerCertificateToken != null) {
addCertificateTokenForVerification(issuerCertificateToken);
}
// Cache the result (successful or unsuccessful)
tokenIssuerMap.put(token, issuerCertificateToken);
return issuerCertificateToken;
}
private CertificateToken getIssuerFromProcessedCertificates(Token token) {
CertificateToken issuerCertificateToken = tokenIssuerMap.get(token);
// isSignedBy(...) check is required when a certificate is present in different sources
// in order to instantiate a public key of the signer
if (issuerCertificateToken != null &&
(token.getPublicKeyOfTheSigner() != null || token.isSignedBy(issuerCertificateToken))) {
return issuerCertificateToken;
}
return null;
}
@Override
public ListCertificateSource getAllCertificateSources() {
ListCertificateSource allCertificateSources = new ListCertificateSource();
allCertificateSources.addAll(documentCertificateSource);
allCertificateSources.addAll(revocationCertificateSources);
allCertificateSources.addAll(aiaCertificateSources);
allCertificateSources.addAll(adjunctCertSources);
allCertificateSources.addAll(trustedCertSources);
return allCertificateSources;
}
@Override
public ListCertificateSource getDocumentCertificateSource() {
return documentCertificateSource;
}
@Override
public ListRevocationSource getDocumentCRLSource() {
return documentCRLSource;
}
@Override
public ListRevocationSource getDocumentOCSPSource() {
return documentOCSPSource;
}
private Set getIssuersFromSources(Token token, ListCertificateSource allCertificateSources) {
if (token.getPublicKeyOfTheSigner() != null) {
return allCertificateSources.getByPublicKey(token.getPublicKeyOfTheSigner());
} else if (token.getIssuerX500Principal() != null) {
return allCertificateSources.getBySubject(new X500PrincipalHelper(token.getIssuerX500Principal()));
}
return Collections.emptySet();
}
private Set getIssuersFromSource(Token token, CertificateSource certificateSource) {
if (token.getPublicKeyOfTheSigner() != null) {
return certificateSource.getByPublicKey(token.getPublicKeyOfTheSigner());
} else if (token.getIssuerX500Principal() != null) {
return certificateSource.getBySubject(new X500PrincipalHelper(token.getIssuerX500Principal()));
}
return Collections.emptySet();
}
private CertificateToken getOCSPIssuer(OCSPToken token, ListCertificateSource allCertificateSources) {
Set signingCertificateRefs = token.getCertificateSource().getAllCertificateRefs();
if (Utils.collectionSize(signingCertificateRefs) == 1) {
CertificateRef signingCertificateRef = signingCertificateRefs.iterator().next();
ResponderId responderId = signingCertificateRef.getResponderId();
if (responderId != null) {
Set issuerCandidates = new HashSet<>();
if (responderId.getSki() != null) {
issuerCandidates.addAll(allCertificateSources.getBySki(responderId.getSki()));
}
if (responderId.getX500Principal() != null) {
issuerCandidates.addAll(allCertificateSources.getBySubject(new X500PrincipalHelper(responderId.getX500Principal())));
}
return new TokenIssuerSelector(token, issuerCandidates).getIssuer();
}
}
LOG.warn("Signing certificate is not found for an OCSPToken with id '{}'.", token.getDSSIdAsString());
return null;
}
private CertificateToken getTSACertificate(TimestampToken timestamp, ListCertificateSource allCertificateSources) {
CandidatesForSigningCertificate candidatesForSigningCertificate = timestamp.getCandidatesForSigningCertificate();
CertificateValidity theBestCandidate = candidatesForSigningCertificate.getTheBestCandidate();
if (theBestCandidate != null) {
Set issuerCandidates = new HashSet<>();
CertificateToken timestampSigner = theBestCandidate.getCertificateToken();
if (timestampSigner == null) {
issuerCandidates.addAll(allCertificateSources.getBySignerIdentifier(theBestCandidate.getSignerInfo()));
} else {
issuerCandidates.add(timestampSigner);
}
return new TokenIssuerSelector(timestamp, issuerCandidates).getIssuer();
}
return null;
}
/**
* Adds a new token to the list of tokens to verify only if it was not already
* verified.
*
* @param token
* token to verify
* @return true if the token was not yet verified, false otherwise.
*/
private boolean addTokenForVerification(final Token token) {
if (token == null) {
return false;
}
final boolean traceEnabled = LOG.isTraceEnabled();
if (traceEnabled) {
LOG.trace("addTokenForVerification: trying to acquire synchronized block");
}
synchronized (tokensToProcess) {
try {
if (tokensToProcess.containsKey(token)) {
if (traceEnabled) {
LOG.trace("Token was already in the list {}:{}", token.getClass().getSimpleName(), token.getAbbreviation());
}
return false;
}
tokensToProcess.put(token, null);
registerPOE(token.getDSSIdAsString(), currentTime);
if (traceEnabled) {
LOG.trace("+ New {} to check: {}", token.getClass().getSimpleName(), token.getAbbreviation());
}
return true;
} finally {
if (traceEnabled) {
LOG.trace("addTokenForVerification: almost left synchronized block");
}
}
}
}
@Override
public void addRevocationTokenForVerification(RevocationToken revocationToken) {
if (addTokenForVerification(revocationToken)) {
RevocationCertificateSource revocationCertificateSource = revocationToken.getCertificateSource();
if (revocationCertificateSource != null) {
addCertificateSource(revocationCertificateSources, revocationCertificateSource);
}
CertificateToken issuerCertificateToken = revocationToken.getIssuerCertificateToken();
if (issuerCertificateToken != null) {
addCertificateTokenForVerification(issuerCertificateToken);
}
final boolean added = processedRevocations.add(revocationToken);
if (LOG.isTraceEnabled()) {
if (added) {
LOG.trace("RevocationToken added to processedRevocations: {} ", revocationToken);
} else {
LOG.trace("RevocationToken already present processedRevocations: {} ", revocationToken);
}
}
}
}
@Override
public void addCertificateTokenForVerification(final CertificateToken certificateToken) {
if (addTokenForVerification(certificateToken)) {
final boolean added = processedCertificates.add(certificateToken);
if (LOG.isTraceEnabled()) {
if (added) {
LOG.trace("CertificateToken added to processedCertificates: {} ", certificateToken);
} else {
LOG.trace("CertificateToken already present processedCertificates: {} ", certificateToken);
}
}
}
}
@Override
public void addTimestampTokenForVerification(final TimestampToken timestampToken) {
if (addTokenForVerification(timestampToken)) {
addDocumentCertificateSource(timestampToken.getCertificateSource());
addDocumentCRLSource(timestampToken.getCRLSource());
addDocumentOCSPSource(timestampToken.getOCSPSource());
List certificateValidities = timestampToken.getCandidatesForSigningCertificate().getCertificateValidityList();
if (Utils.isCollectionNotEmpty(certificateValidities)) {
for (CertificateValidity certificateValidity : certificateValidities) {
if (certificateValidity.isValid() && certificateValidity.getCertificateToken() != null) {
addCertificateTokenForVerification(certificateValidity.getCertificateToken());
}
}
}
registerTimestampUsageDate(timestampToken);
final boolean added = processedTimestamps.add(timestampToken);
if (LOG.isTraceEnabled()) {
if (added) {
LOG.trace("TimestampToken added to processedTimestamps: {} ", processedTimestamps);
} else {
LOG.trace("TimestampToken already present processedTimestamps: {} ", processedTimestamps);
}
}
}
}
private void registerTimestampUsageDate(TimestampToken timestampToken) {
CertificateToken tsaCertificate = getTSACertificate(timestampToken, getAllCertificateSources());
if (tsaCertificate == null) {
LOG.warn("No Timestamp Certificate found. Chain is skipped.");
return;
}
List tsaCertificateChain = toCertificateTokenChain(getCertChain(tsaCertificate));
Date usageDate = timestampToken.getCreationDate();
for (CertificateToken cert : tsaCertificateChain) {
Date lastUsage = lastTimestampCertChainDates.get(cert);
if (lastUsage == null || lastUsage.before(usageDate)) {
lastTimestampCertChainDates.put(cert, usageDate);
}
}
if (isTimestampValid(timestampToken)) {
LOG.debug("Extracting POE from timestamp : {}", timestampToken.getDSSIdAsString());
for (TimestampedReference timestampedReference : timestampToken.getTimestampedReferences()) {
registerPOE(timestampedReference.getObjectId(), timestampToken);
}
}
}
/**
* This method verifies whether a {@code timestampToken} is valid and
* can be used as a valid POE for covered objects
*
* @param timestampToken {@link TimestampToken} to be checked
* @return TRUE if the timestamp is valid, FALSE otherwise
*/
protected boolean isTimestampValid(TimestampToken timestampToken) {
if (!extractPOEFromUntrustedChains && !containsTrustAnchor(getCertChain(timestampToken))) {
LOG.warn("POE extraction is skipped for untrusted timestamp : {}.", timestampToken.getDSSIdAsString());
return false;
}
if (!timestampToken.isMessageImprintDataIntact()) {
LOG.warn("POE extraction is skipped for timestamp : {}. The message-imprint is not intact!",
timestampToken.getDSSIdAsString());
return false;
}
if (!timestampToken.isSignatureIntact()) {
LOG.warn("POE extraction is skipped for timestamp : {}. The signature is not intact!",
timestampToken.getDSSIdAsString());
return false;
}
return true;
}
private void registerPOE(String tokenId, TimestampToken timestampToken) {
List poeTimeList = poeTimes.get(tokenId);
if (Utils.isCollectionEmpty(poeTimeList)) {
poeTimeList = new ArrayList<>();
poeTimes.put(tokenId, poeTimeList);
}
poeTimeList.add(new POE(timestampToken));
}
private void registerPOE(String tokenId, Date poeTime) {
List poeTimeList = poeTimes.get(tokenId);
if (Utils.isCollectionEmpty(poeTimeList)) {
poeTimeList = new ArrayList<>();
poeTimes.put(tokenId, poeTimeList);
}
poeTimeList.add(new POE(poeTime));
}
private List toCertificateTokenChain(List tokens) {
List chain = new LinkedList<>();
for (Token token : tokens) {
if (token instanceof CertificateToken) {
chain.add((CertificateToken) token);
}
}
return chain;
}
@Override
public void addEvidenceRecordForVerification(EvidenceRecord evidenceRecord) {
addDocumentCertificateSource(evidenceRecord.getCertificateSource());
addDocumentCRLSource(evidenceRecord.getCRLSource());
addDocumentOCSPSource(evidenceRecord.getOCSPSource());
prepareTimestamps(evidenceRecord.getTimestamps());
}
@Override
public void validate() {
TimestampToken timestampToken = getNotYetVerifiedTimestamp();
while (timestampToken != null) {
getCertChain(timestampToken);
timestampToken = getNotYetVerifiedTimestamp();
}
Token token = getNotYetVerifiedToken();
while (token != null) {
// extract the certificate chain and add missing tokens for verification
List certChain = getCertChain(token);
if (token instanceof CertificateToken) {
getRevocationData((CertificateToken) token, certChain);
}
token = getNotYetVerifiedToken();
}
}
/**
* Retrieves the revocation data from signature (if exists) or from the online
* sources. The issuer certificate must be provided, the underlining library
* (bouncy castle) needs it to build the request.
*
* @param certToken the current token
* @param certChain the complete chain
* @return a set of found {@link RevocationToken}s
*/
private Set> getRevocationData(final CertificateToken certToken, List certChain) {
if (LOG.isTraceEnabled()) {
LOG.trace("Checking revocation data for : {}", certToken.getDSSIdAsString());
}
if (isRevocationDataNotRequired(certToken)) {
LOG.debug("Revocation data is not required for certificate : {}", certToken.getDSSIdAsString());
return Collections.emptySet();
}
CertificateToken issuerToken = getIssuer(certToken);
if (issuerToken == null) {
LOG.warn("Issuer not found for certificate {}", certToken.getDSSIdAsString());
return Collections.emptySet();
}
Set> revocations = new HashSet<>();
// ALL Embedded revocation data
List> crlTokens = documentCRLSource.getRevocationTokens(certToken, issuerToken);
for (RevocationToken revocationToken : crlTokens) {
revocations.add(revocationToken);
addRevocationTokenForVerification(revocationToken);
}
List> ocspTokens = documentOCSPSource.getRevocationTokens(certToken, issuerToken);
for (RevocationToken revocationToken : ocspTokens) {
revocations.add(revocationToken);
addRevocationTokenForVerification(revocationToken);
addDocumentCertificateSource(revocationToken.getCertificateSource()); // applicable only for OCSP
}
// add processed revocation tokens
revocations.addAll(getRelatedRevocationTokens(certToken));
if ((remoteOCSPSource != null || remoteCRLSource != null) &&
(Utils.isCollectionEmpty(revocations) || isRevocationDataRefreshNeeded(certToken, revocations))) {
LOG.debug("The signature does not contain relative revocation data.");
if (checkRevocationForUntrustedChains || containsTrustAnchor(certChain)) {
LOG.trace("Revocation update is in progress for certificate : {}", certToken.getDSSIdAsString());
CertificateToken trustAnchor = (CertificateToken) getFirstTrustAnchor(certChain);
// Fetch OCSP or CRL from online sources
final RevocationToken onlineRevocationToken = getRevocationToken(certToken, issuerToken, trustAnchor);
// Check if the obtained revocation is not yet present
if (onlineRevocationToken != null && !revocations.contains(onlineRevocationToken)) {
LOG.debug("Obtained a new revocation data : {}, for certificate : {}",
onlineRevocationToken.getDSSIdAsString(), certToken.getDSSIdAsString());
revocations.add(onlineRevocationToken);
addRevocationTokenForVerification(onlineRevocationToken);
}
} else {
LOG.warn("External revocation check is skipped for untrusted certificate : {}", certToken.getDSSIdAsString());
}
}
if (revocations.isEmpty()) {
LOG.warn("No revocation found for the certificate {}", certToken.getDSSIdAsString());
}
return revocations;
}
private boolean containsTrustAnchor(List certChain) {
return getFirstTrustAnchor(certChain) != null;
}
private Token getFirstTrustAnchor(List certChain) {
if (Utils.isCollectionNotEmpty(certChain)) {
for (T token : certChain) {
if (isTrusted(token)) {
return token;
}
}
}
return null;
}
private RevocationToken getRevocationToken(CertificateToken certificateToken, CertificateToken issuerCertificate,
CertificateToken trustAnchor) {
// configure the CompositeRevocationSource
RevocationSource currentOCSPSource;
RevocationSource currentCRLSource;
if (!trustedCertSources.isEmpty() && trustAnchor != null) {
LOG.trace("Initializing a revocation verifier for a trusted chain...");
currentOCSPSource = instantiateOCSPWithTrustServices(trustAnchor);
currentCRLSource = instantiateCRLWithTrustServices(trustAnchor);
} else {
LOG.trace("Initializing a revocation verifier for not trusted chain...");
currentOCSPSource = remoteOCSPSource;
currentCRLSource = remoteCRLSource;
}
// fetch the data
final RevocationDataLoadingStrategy revocationDataLoadingStrategy = revocationDataLoadingStrategyFactory.create();
revocationDataLoadingStrategy.setCrlSource(currentCRLSource);
revocationDataLoadingStrategy.setOcspSource(currentOCSPSource);
revocationDataLoadingStrategy.setRevocationDataVerifier(revocationDataVerifier);
revocationDataLoadingStrategy.setFallbackEnabled(revocationFallback);
return revocationDataLoadingStrategy.getRevocationToken(certificateToken, issuerCertificate);
}
private RevocationSource instantiateOCSPWithTrustServices(CertificateToken trustAnchor) {
List alternativeOCSPUrls = getAlternativeOCSPUrls(trustAnchor);
if (Utils.isCollectionNotEmpty(alternativeOCSPUrls) && remoteOCSPSource instanceof RevocationSourceAlternateUrlsSupport) {
return new AlternateUrlsSourceAdapter<>((RevocationSourceAlternateUrlsSupport) remoteOCSPSource, alternativeOCSPUrls);
} else {
return remoteOCSPSource;
}
}
private RevocationSource instantiateCRLWithTrustServices(CertificateToken trustAnchor) {
List alternativeCRLUrls = getAlternativeCRLUrls(trustAnchor);
if (Utils.isCollectionNotEmpty(alternativeCRLUrls) && remoteCRLSource instanceof RevocationSourceAlternateUrlsSupport) {
return new AlternateUrlsSourceAdapter<>((RevocationSourceAlternateUrlsSupport) remoteCRLSource, alternativeCRLUrls);
} else {
return remoteCRLSource;
}
}
private List getAlternativeOCSPUrls(CertificateToken trustAnchor) {
List alternativeOCSPUrls = new ArrayList<>();
for (CertificateSource certificateSource : trustedCertSources.getSources()) {
if (certificateSource instanceof CommonTrustedCertificateSource) {
CommonTrustedCertificateSource trustedCertSource = (CommonTrustedCertificateSource) certificateSource;
alternativeOCSPUrls.addAll(trustedCertSource.getAlternativeOCSPUrls(trustAnchor));
}
}
return alternativeOCSPUrls;
}
private List getAlternativeCRLUrls(CertificateToken trustAnchor) {
List alternativeCRLUrls = new ArrayList<>();
for (CertificateSource certificateSource : trustedCertSources.getSources()) {
if (certificateSource instanceof CommonTrustedCertificateSource) {
CommonTrustedCertificateSource trustedCertSource = (CommonTrustedCertificateSource) certificateSource;
alternativeCRLUrls.addAll(trustedCertSource.getAlternativeCRLUrls(trustAnchor));
}
}
return alternativeCRLUrls;
}
@Override
public boolean checkAllRequiredRevocationDataPresent() {
TokenStatus status = new TokenStatus();
Map> orderedCertificateChains = getOrderedCertificateChains();
for (List orderedCertChain : orderedCertificateChains.values()) {
checkRevocationForCertificateChainAgainstBestSignatureTime(orderedCertChain, null, status);
}
boolean success = status.isEmpty();
if (!success) {
status.setMessage("Revocation data is missing for one or more certificate(s).");
certificateVerifier.getAlertOnMissingRevocationData().alert(status);
}
return success;
}
private void checkRevocationForCertificateChainAgainstBestSignatureTime(List certificates,
Date bestSignatureTime, TokenStatus status) {
for (CertificateToken certificateToken : certificates) {
if (isSelfSignedOrTrusted(certificateToken)) {
// break on the first trusted entry
break;
} else if (isOCSPNoCheckExtension(certificateToken)) {
// skip the revocation check for OCSP certs if no check is specified
continue;
}
boolean found = false;
Date earliestNextUpdate = null;
List> relatedRevocationTokens = getRelatedRevocationTokens(certificateToken);
for (RevocationToken revocationToken : relatedRevocationTokens) {
if (bestSignatureTime == null || bestSignatureTime.before(revocationToken.getThisUpdate())) {
found = true;
break;
} else {
if (revocationToken.getNextUpdate() != null &&
(earliestNextUpdate == null || earliestNextUpdate.after(revocationToken.getNextUpdate()))) {
earliestNextUpdate = revocationToken.getNextUpdate();
}
}
}
if (!found) {
if (!certificateVerifier.isCheckRevocationForUntrustedChains() && !containsTrustAnchor(certificates)) {
status.addRelatedTokenAndErrorMessage(certificateToken,
"Revocation data is skipped for untrusted certificate chain!");
} else if (Utils.isCollectionEmpty(relatedRevocationTokens) || bestSignatureTime == null) {
// simple revocation presence check
status.addRelatedTokenAndErrorMessage(certificateToken, "No revocation data found for certificate!");
} else if (earliestNextUpdate != null) {
status.addRelatedTokenAndErrorMessage(certificateToken, String.format(
"No revocation data found after the best signature time [%s]! " +
"The nextUpdate available after : [%s]",
DSSUtils.formatDateToRFC(bestSignatureTime), DSSUtils.formatDateToRFC(earliestNextUpdate)));
} else {
status.addRelatedTokenAndErrorMessage(certificateToken, String.format(
"No revocation data found after the best signature time [%s]!",
DSSUtils.formatDateToRFC(bestSignatureTime)));
}
if (status instanceof RevocationFreshnessStatus) {
if (Utils.isCollectionNotEmpty(relatedRevocationTokens) && earliestNextUpdate == null) {
Date lowestPOETime = getLowestPOETime(certificateToken);
if (lowestPOETime != null) {
earliestNextUpdate = new Date(lowestPOETime.getTime() + 1000); // last usage + 1s
}
}
if (earliestNextUpdate != null) {
((RevocationFreshnessStatus) status).addTokenAndRevocationNextUpdateTime(certificateToken, earliestNextUpdate);
}
}
}
}
}
@Override
public boolean checkAllPOECoveredByRevocationData() {
RevocationFreshnessStatus status = new RevocationFreshnessStatus();
Map> orderedCertificateChains = getOrderedCertificateChains();
for (Map.Entry> entry : orderedCertificateChains.entrySet()) {
CertificateToken firstChainCertificate = entry.getKey();
Date lastCertUsageDate = lastTimestampCertChainDates.get(firstChainCertificate);
if (lastCertUsageDate != null) {
checkRevocationForCertificateChainAgainstBestSignatureTime(entry.getValue(), lastCertUsageDate, status);
}
}
boolean success = status.isEmpty();
if (!success) {
status.setMessage("Revocation data is missing for one or more POE(s).");
certificateVerifier.getAlertOnUncoveredPOE().alert(status);
}
return success;
}
@Override
public boolean checkAllTimestampsValid() {
TokenStatus status = new TokenStatus();
for (TimestampToken timestampToken : processedTimestamps) {
if (!timestampToken.isSignatureIntact() || !timestampToken.isMessageImprintDataFound() ||
!timestampToken.isMessageImprintDataIntact()) {
status.addRelatedTokenAndErrorMessage(timestampToken, "Signature is not intact!");
}
}
boolean success = status.isEmpty();
if (!success) {
status.setMessage("Broken timestamp(s) detected.");
certificateVerifier.getAlertOnInvalidTimestamp().alert(status);
}
return success;
}
@Override
public boolean checkCertificateNotRevoked(CertificateToken certificateToken) {
TokenStatus status = new TokenStatus();
checkCertificateIsNotRevokedRecursively(certificateToken, poeTimes.get(certificateToken.getDSSIdAsString()), status);
boolean success = status.isEmpty();
if (!success) {
status.setMessage("Revoked/Suspended certificate(s) detected.");
certificateVerifier.getAlertOnRevokedCertificate().alert(status);
}
return success;
}
@Override
public boolean checkCertificatesNotRevoked(AdvancedSignature signature) {
TokenStatus status = new TokenStatus();
CertificateToken signingCertificate = signature.getSigningCertificateToken();
if (signingCertificate != null) {
checkCertificateIsNotRevokedRecursively(signingCertificate, poeTimes.get(signature.getId()), status);
}
boolean success = status.isEmpty();
if (!success) {
status.setMessage("Revoked/Suspended certificate(s) detected.");
certificateVerifier.getAlertOnRevokedCertificate().alert(status);
}
return success;
}
private boolean checkCertificateIsNotRevokedRecursively(CertificateToken certificateToken, List poeTimes) {
return checkCertificateIsNotRevokedRecursively(certificateToken, poeTimes, null);
}
private boolean checkCertificateIsNotRevokedRecursively(CertificateToken certificateToken, List poeTimes, TokenStatus status) {
if (isSelfSignedOrTrusted(certificateToken)) {
return true;
} else if (!isOCSPNoCheckExtension(certificateToken)) {
List> relatedRevocationTokens = getRelatedRevocationTokens(certificateToken);
// check only available revocation data in order to not duplicate
// the method {@code checkAllRequiredRevocationDataPresent()}
if (Utils.isCollectionNotEmpty(relatedRevocationTokens)) {
// check if there is a best-signature-time before the revocation date
for (RevocationToken revocationToken : relatedRevocationTokens) {
if ((revocationToken.getStatus().isRevoked() && !hasPOEBeforeRevocationDate(revocationToken.getRevocationDate(), poeTimes))
|| !revocationToken.getStatus().isKnown()) {
if (status != null) {
status.addRelatedTokenAndErrorMessage(certificateToken, "Certificate is revoked/suspended!");
}
return false;
}
}
}
}
CertificateToken issuer = getIssuer(certificateToken);
if (issuer != null) {
return checkCertificateIsNotRevokedRecursively(issuer, poeTimes, status);
}
return true;
}
private boolean hasPOEBeforeRevocationDate(Date revocationDate, List poeTimes) {
if (Utils.isCollectionNotEmpty(poeTimes)) {
for (POE poe : poeTimes) {
if (verifyPOE(poe) && poe.getTime().before(revocationDate)) {
return true;
}
}
}
return false;
}
private boolean isRevocationDataNotRequired(CertificateToken certToken) {
return isSelfSignedOrTrusted(certToken) || isOCSPNoCheckExtension(certToken);
}
private boolean isSelfSignedOrTrusted(CertificateToken certToken) {
return certToken.isSelfSigned() || isTrusted(certToken);
}
private boolean isOCSPNoCheckExtension(CertificateToken certToken) {
return CertificateExtensionsUtils.hasOcspNoCheckExtension(certToken);
}
private List> getRelatedRevocationTokens(CertificateToken certificateToken) {
List> result = new ArrayList<>();
for (RevocationToken revocationToken : processedRevocations) {
if (Utils.areStringsEqual(certificateToken.getDSSIdAsString(), revocationToken.getRelatedCertificateId())) {
result.add(revocationToken);
}
}
return result;
}
private boolean isRevocationDataRefreshNeeded(CertificateToken certToken, Collection> revocations) {
// get best-signature-time for b-level certificate chain
Date refreshNeededAfterTime = bestSignatureTimeCertChainDates.get(certToken);
// get last usage dates for the same timestamp certificate chain
Date lastTimestampUsageTime = lastTimestampCertChainDates.get(certToken);
if (lastTimestampUsageTime != null && (refreshNeededAfterTime == null || lastTimestampUsageTime.after(refreshNeededAfterTime))) {
refreshNeededAfterTime = lastTimestampUsageTime;
}
// return best POE for other cases
if (refreshNeededAfterTime == null) {
// shall not return null
refreshNeededAfterTime = getLowestPOETime(certToken);
}
boolean freshRevocationDataFound = false;
for (RevocationToken revocationToken : revocations) {
final List certificateTokenChain = toCertificateTokenChain(getCertChain(revocationToken));
if (Utils.isCollectionEmpty(certificateTokenChain)) {
LOG.debug("Certificate chain is not found for a revocation data '{}'!", revocationToken.getDSSIdAsString());
continue;
}
final CertificateToken issuerCertificateToken = certificateTokenChain.iterator().next();
if (refreshNeededAfterTime != null && (refreshNeededAfterTime.before(revocationToken.getThisUpdate()))
&& (RevocationReason.CERTIFICATE_HOLD != revocationToken.getReason()
&& isRevocationAcceptable(revocationToken, issuerCertificateToken)
&& hasValidPOE(revocationToken, certToken, issuerCertificateToken))) {
freshRevocationDataFound = true;
break;
}
}
if (!freshRevocationDataFound) {
LOG.debug("Revocation data refresh is needed");
return true;
}
return false;
}
private Date getLowestPOETime(Token token) {
Date lowestPOE = null;
List poeList = poeTimes.get(token.getDSSIdAsString());
if (Utils.isCollectionEmpty(poeList)) {
throw new IllegalStateException("POE shall be defined before accessing the 'poeTimes' list!");
}
for (POE poe : poeList) {
Date poeTime = poe.getTime();
if (lowestPOE == null || poeTime.before(lowestPOE)) {
lowestPOE = poeTime;
}
}
return lowestPOE;
}
private boolean isRevocationAcceptable(RevocationToken revocation, CertificateToken issuerCertificateToken) {
return revocationDataVerifier.isAcceptable(revocation, issuerCertificateToken);
}
private boolean hasValidPOE(RevocationToken revocation, CertificateToken relatedCertToken, CertificateToken issuerCertToken) {
if (revocation.getNextUpdate() != null && !hasPOEAfterProductionAndBeforeNextUpdate(revocation)) {
LOG.debug("There is no POE for the revocation '{}' after its production time and before the nextUpdate! " +
"Certificate: {}", revocation.getDSSIdAsString(), relatedCertToken.getDSSIdAsString());
return false;
}
// useful for short-life certificates (i.e. ocsp responder)
if (issuerCertToken != null && !isTrusted(issuerCertToken) && !hasPOEInTheValidityRange(issuerCertToken)) {
LOG.debug("There is no POE for the revocation issuer '{}' for revocation '{}' within its validity range! " +
"Certificate: {}", issuerCertToken.getDSSIdAsString(), revocation.getDSSIdAsString(), relatedCertToken.getDSSIdAsString());
return false;
}
LOG.debug("The revocation '{}' has a valid POE. Certificate: {}", revocation.getDSSIdAsString(), relatedCertToken.getDSSIdAsString());
return true;
}
private boolean hasPOEAfterProductionAndBeforeNextUpdate(RevocationToken revocation) {
List poeTimeList = poeTimes.get(revocation.getDSSIdAsString());
if (Utils.isCollectionNotEmpty(poeTimeList)) {
for (POE poeTime : poeTimeList) {
if (isConsistentAtTime(revocation, poeTime.getTime())) {
return true;
}
}
}
return false;
}
private boolean hasPOEInTheValidityRange(CertificateToken certificateToken) {
List poeTimeList = poeTimes.get(certificateToken.getDSSIdAsString());
if (Utils.isCollectionNotEmpty(poeTimeList)) {
for (POE poeTime : poeTimeList) {
if (certificateToken.isValidOn(poeTime.getTime())) {
return true;
}
// continue
}
}
return false;
}
private boolean isConsistentAtTime(RevocationToken revocationToken, Date date) {
Date productionDate = revocationToken.getProductionDate();
Date nextUpdate = revocationToken.getNextUpdate();
return date.compareTo(productionDate) >= 0 && date.compareTo(nextUpdate) <= 0;
}
@Override
public boolean checkAtLeastOneRevocationDataPresentAfterBestSignatureTime(AdvancedSignature signature) {
RevocationFreshnessStatus status = new RevocationFreshnessStatus();
CertificateToken signingCertificateToken = signature.getSigningCertificateToken();
Map> orderedCertificateChains = getOrderedCertificateChains();
for (Map.Entry> entry : orderedCertificateChains.entrySet()) {
CertificateToken firstChainCertificate = entry.getKey();
if (firstChainCertificate.equals(signingCertificateToken)) {
Date bestSignatureTime = getEarliestTimestampTime();
checkRevocationForCertificateChainAgainstBestSignatureTime(entry.getValue(), bestSignatureTime, status);
}
}
boolean success = status.isEmpty();
if (!success) {
status.setMessage("Fresh revocation data is missing for one or more certificate(s).");
certificateVerifier.getAlertOnNoRevocationAfterBestSignatureTime().alert(status);
}
return success;
}
private Date getEarliestTimestampTime() {
Date earliestDate = null;
for (TimestampToken timestamp : getProcessedTimestamps()) {
if (timestamp.getTimeStampType().coversSignature()) {
Date timestampTime = timestamp.getCreationDate();
if (earliestDate == null || timestampTime.before(earliestDate)) {
earliestDate = timestampTime;
}
}
}
return earliestDate;
}
@Override
public boolean checkSignatureNotExpired(AdvancedSignature signature) {
SignatureStatus status = new SignatureStatus();
CertificateToken signingCertificate = signature.getSigningCertificateToken();
if (signingCertificate != null) {
boolean signatureNotExpired = verifyCertificateTokenHasPOERecursively(signingCertificate, poeTimes.get(signature.getId()));
if (!signatureNotExpired) {
status.addRelatedTokenAndErrorMessage(signature, String.format("The signing certificate has expired " +
"and there is no POE during its validity range : [%s - %s]!",
DSSUtils.formatDateToRFC(signingCertificate.getNotBefore()),
DSSUtils.formatDateToRFC(signingCertificate.getNotAfter())));
status.setMessage("Expired signature found.");
certificateVerifier.getAlertOnExpiredSignature().alert(status);
}
return signatureNotExpired;
}
return true;
}
private boolean verifyCertificateTokenHasPOERecursively(CertificateToken certificateToken, List poeTimeList) {
if (Utils.isCollectionNotEmpty(poeTimeList)) {
for (POE poeTime : poeTimeList) {
if (certificateToken.isValidOn(poeTime.getTime()) && verifyPOE(poeTime)) {
return true;
}
}
}
return false;
}
private boolean verifyPOE(POE poe) {
TimestampToken timestampToken = poe.getTimestampToken();
if (timestampToken != null) {
// check if the timestamp is valid at validation time
CertificateToken issuerCertificateToken = getIssuer(timestampToken);
List timestampPOEs = poeTimes.get(timestampToken.getDSSIdAsString());
return issuerCertificateToken != null && timestampToken.isValid()
&& verifyCertificateTokenHasPOERecursively(issuerCertificateToken, timestampPOEs)
&& checkCertificateIsNotRevokedRecursively(issuerCertificateToken, timestampPOEs);
}
// POE is provided
return true;
}
@Override
public Set getProcessedCertificates() {
return Collections.unmodifiableSet(processedCertificates);
}
@Override
public Set getProcessedRevocations() {
return Collections.unmodifiableSet(processedRevocations);
}
@Override
public Set getProcessedTimestamps() {
return Collections.unmodifiableSet(processedTimestamps);
}
private boolean isTrusted(T token) {
return token instanceof CertificateToken && trustedCertSources.isTrusted((CertificateToken) token);
}
@Override
public ValidationData getValidationData(final AdvancedSignature signature) {
return getValidationData(signature.getSigningCertificateToken());
}
@Override
public ValidationData getValidationData(final TimestampToken timestampToken) {
return getValidationData(getIssuer(timestampToken));
}
private ValidationData getValidationData(final CertificateToken certificateToken) {
ValidationData validationData = new ValidationData();
if (certificateToken != null) {
populateValidationDataRecursively(certificateToken, validationData);
}
return validationData;
}
private void populateValidationDataRecursively(final Token token, final ValidationData validationData) {
boolean added = validationData.addToken(token);
if (added) {
if (token instanceof CertificateToken) {
List> revocationTokens = getRelatedRevocationTokens((CertificateToken) token);
for (RevocationToken revocationToken : revocationTokens) {
populateValidationDataRecursively(revocationToken, validationData);
}
}
CertificateToken issuerToken = getIssuer(token);
if (issuerToken != null) {
populateValidationDataRecursively(issuerToken, validationData);
}
}
}
/**
* This class defines a POE provided to the validation process or obtained from processed timestamps
*/
private static class POE {
/** The POE time */
private final Date time;
/** The TimestampToken provided the POE, when present */
private TimestampToken timestampToken;
/**
* Default constructor to instantiate the object from a provided time
*
* @param time {@link Date}
*/
public POE(final Date time) {
this.time = time;
}
/**
* Constructor to instantiate the POE object from a TimestampToken
*
* @param timestampToken {@link TimestampToken}
*/
public POE(TimestampToken timestampToken) {
this.timestampToken = timestampToken;
this.time = timestampToken.getCreationDate();
}
/**
* Returns the POE time
*
* @return {@link Date}
*/
public Date getTime() {
return time;
}
/**
* Returns the TimestampToken used to create the POE, when present
*
* @return {@link TimestampToken} if it has been used for the POE, null otherwise
*/
public TimestampToken getTimestampToken() {
return timestampToken;
}
}
}