Java example source code file (ReverseBuilder.java)
The ReverseBuilder.java Java example source code
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package sun.security.provider.certpath;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.Principal;
import java.security.cert.CertificateException;
import java.security.cert.CertPathValidatorException;
import java.security.cert.CertStore;
import java.security.cert.CertStoreException;
import java.security.cert.PKIXBuilderParameters;
import java.security.cert.PKIXCertPathChecker;
import java.security.cert.PKIXParameters;
import java.security.cert.PKIXReason;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.security.cert.X509CertSelector;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.LinkedList;
import java.util.Set;
import javax.security.auth.x500.X500Principal;
import sun.security.provider.certpath.PKIX.BuilderParams;
import sun.security.util.Debug;
import sun.security.x509.Extension;
import static sun.security.x509.PKIXExtensions.*;
import sun.security.x509.X500Name;
import sun.security.x509.X509CertImpl;
import sun.security.x509.PolicyMappingsExtension;
/**
* This class represents a reverse builder, which is able to retrieve
* matching certificates from CertStores and verify a particular certificate
* against a ReverseState.
*
* @since 1.4
* @author Sean Mullan
* @author Yassir Elley
*/
class ReverseBuilder extends Builder {
private Debug debug = Debug.getInstance("certpath");
private final Set<String> initPolicies;
/**
* Initialize the builder with the input parameters.
*
* @param params the parameter set used to build a certification path
*/
ReverseBuilder(BuilderParams buildParams) {
super(buildParams);
Set<String> initialPolicies = buildParams.initialPolicies();
initPolicies = new HashSet<String>();
if (initialPolicies.isEmpty()) {
// if no initialPolicies are specified by user, set
// initPolicies to be anyPolicy by default
initPolicies.add(PolicyChecker.ANY_POLICY);
} else {
initPolicies.addAll(initialPolicies);
}
}
/**
* Retrieves all certs from the specified CertStores that satisfy the
* requirements specified in the parameters and the current
* PKIX state (name constraints, policy constraints, etc).
*
* @param currentState the current state.
* Must be an instance of <code>ReverseState
* @param certStores list of CertStores
*/
@Override
Collection<X509Certificate> getMatchingCerts
(State currState, List<CertStore> certStores)
throws CertStoreException, CertificateException, IOException
{
ReverseState currentState = (ReverseState) currState;
if (debug != null)
debug.println("In ReverseBuilder.getMatchingCerts.");
/*
* The last certificate could be an EE or a CA certificate
* (we may be building a partial certification path or
* establishing trust in a CA).
*
* Try the EE certs before the CA certs. It will be more
* common to build a path to an end entity.
*/
Collection<X509Certificate> certs =
getMatchingEECerts(currentState, certStores);
certs.addAll(getMatchingCACerts(currentState, certStores));
return certs;
}
/*
* Retrieves all end-entity certificates which satisfy constraints
* and requirements specified in the parameters and PKIX state.
*/
private Collection<X509Certificate> getMatchingEECerts
(ReverseState currentState, List<CertStore> certStores)
throws CertStoreException, CertificateException, IOException {
/*
* Compose a CertSelector to filter out
* certs which do not satisfy requirements.
*
* First, retrieve clone of current target cert constraints, and
* then add more selection criteria based on current validation state.
*/
X509CertSelector sel = (X509CertSelector) targetCertConstraints.clone();
/*
* Match on issuer (subject of previous cert)
*/
sel.setIssuer(currentState.subjectDN);
/*
* Match on certificate validity date.
*/
sel.setCertificateValid(buildParams.date());
/*
* Policy processing optimizations
*/
if (currentState.explicitPolicy == 0)
sel.setPolicy(getMatchingPolicies());
/*
* If previous cert has a subject key identifier extension,
* use it to match on authority key identifier extension.
*/
/*if (currentState.subjKeyId != null) {
AuthorityKeyIdentifierExtension authKeyId = new AuthorityKeyIdentifierExtension(
(KeyIdentifier) currentState.subjKeyId.get(SubjectKeyIdentifierExtension.KEY_ID),
null, null);
sel.setAuthorityKeyIdentifier(authKeyId.getExtensionValue());
}*/
/*
* Require EE certs
*/
sel.setBasicConstraints(-2);
/* Retrieve matching certs from CertStores */
HashSet<X509Certificate> eeCerts = new HashSet<>();
addMatchingCerts(sel, certStores, eeCerts, true);
if (debug != null) {
debug.println("ReverseBuilder.getMatchingEECerts got "
+ eeCerts.size() + " certs.");
}
return eeCerts;
}
/*
* Retrieves all CA certificates which satisfy constraints
* and requirements specified in the parameters and PKIX state.
*/
private Collection<X509Certificate> getMatchingCACerts
(ReverseState currentState, List<CertStore> certStores)
throws CertificateException, CertStoreException, IOException {
/*
* Compose a CertSelector to filter out
* certs which do not satisfy requirements.
*/
X509CertSelector sel = new X509CertSelector();
/*
* Match on issuer (subject of previous cert)
*/
sel.setIssuer(currentState.subjectDN);
/*
* Match on certificate validity date.
*/
sel.setCertificateValid(buildParams.date());
/*
* Match on target subject name (checks that current cert's
* name constraints permit it to certify target).
* (4 is the integer type for DIRECTORY name).
*/
byte[] subject = targetCertConstraints.getSubjectAsBytes();
if (subject != null) {
sel.addPathToName(4, subject);
} else {
X509Certificate cert = targetCertConstraints.getCertificate();
if (cert != null) {
sel.addPathToName(4,
cert.getSubjectX500Principal().getEncoded());
}
}
/*
* Policy processing optimizations
*/
if (currentState.explicitPolicy == 0)
sel.setPolicy(getMatchingPolicies());
/*
* If previous cert has a subject key identifier extension,
* use it to match on authority key identifier extension.
*/
/*if (currentState.subjKeyId != null) {
AuthorityKeyIdentifierExtension authKeyId = new AuthorityKeyIdentifierExtension(
(KeyIdentifier) currentState.subjKeyId.get(SubjectKeyIdentifierExtension.KEY_ID),
null, null);
sel.setAuthorityKeyIdentifier(authKeyId.getExtensionValue());
}*/
/*
* Require CA certs
*/
sel.setBasicConstraints(0);
/* Retrieve matching certs from CertStores */
ArrayList<X509Certificate> reverseCerts = new ArrayList<>();
addMatchingCerts(sel, certStores, reverseCerts, true);
/* Sort remaining certs using name constraints */
Collections.sort(reverseCerts, new PKIXCertComparator());
if (debug != null)
debug.println("ReverseBuilder.getMatchingCACerts got " +
reverseCerts.size() + " certs.");
return reverseCerts;
}
/*
* This inner class compares 2 PKIX certificates according to which
* should be tried first when building a path to the target. For
* now, the algorithm is to look at name constraints in each cert and those
* which constrain the path closer to the target should be
* ranked higher. Later, we may want to consider other components,
* such as key identifiers.
*/
class PKIXCertComparator implements Comparator<X509Certificate> {
private Debug debug = Debug.getInstance("certpath");
@Override
public int compare(X509Certificate cert1, X509Certificate cert2) {
/*
* if either cert certifies the target, always
* put at head of list.
*/
X500Principal targetSubject = buildParams.targetSubject();
if (cert1.getSubjectX500Principal().equals(targetSubject)) {
return -1;
}
if (cert2.getSubjectX500Principal().equals(targetSubject)) {
return 1;
}
int targetDist1;
int targetDist2;
try {
X500Name targetSubjectName = X500Name.asX500Name(targetSubject);
targetDist1 = Builder.targetDistance(
null, cert1, targetSubjectName);
targetDist2 = Builder.targetDistance(
null, cert2, targetSubjectName);
} catch (IOException e) {
if (debug != null) {
debug.println("IOException in call to Builder.targetDistance");
e.printStackTrace();
}
throw new ClassCastException
("Invalid target subject distinguished name");
}
if (targetDist1 == targetDist2)
return 0;
if (targetDist1 == -1)
return 1;
if (targetDist1 < targetDist2)
return -1;
return 1;
}
}
/**
* Verifies a matching certificate.
*
* This method executes any of the validation steps in the PKIX path validation
* algorithm which were not satisfied via filtering out non-compliant
* certificates with certificate matching rules.
*
* If the last certificate is being verified (the one whose subject
* matches the target subject, then the steps in Section 6.1.4 of the
* Certification Path Validation algorithm are NOT executed,
* regardless of whether or not the last cert is an end-entity
* cert or not. This allows callers to certify CA certs as
* well as EE certs.
*
* @param cert the certificate to be verified
* @param currentState the current state against which the cert is verified
* @param certPathList the certPathList generated thus far
*/
@Override
void verifyCert(X509Certificate cert, State currState,
List<X509Certificate> certPathList)
throws GeneralSecurityException
{
if (debug != null) {
debug.println("ReverseBuilder.verifyCert(SN: "
+ Debug.toHexString(cert.getSerialNumber())
+ "\n Subject: " + cert.getSubjectX500Principal() + ")");
}
ReverseState currentState = (ReverseState) currState;
/* we don't perform any validation of the trusted cert */
if (currentState.isInitial()) {
return;
}
// Don't bother to verify untrusted certificate more.
currentState.untrustedChecker.check(cert,
Collections.<String>emptySet());
/*
* check for looping - abort a loop if
* ((we encounter the same certificate twice) AND
* ((policyMappingInhibited = true) OR (no policy mapping
* extensions can be found between the occurrences of the same
* certificate)))
* in order to facilitate the check to see if there are
* any policy mapping extensions found between the occurrences
* of the same certificate, we reverse the certpathlist first
*/
if ((certPathList != null) && (!certPathList.isEmpty())) {
List<X509Certificate> reverseCertList = new ArrayList<>();
for (X509Certificate c : certPathList) {
reverseCertList.add(0, c);
}
boolean policyMappingFound = false;
for (X509Certificate cpListCert : reverseCertList) {
X509CertImpl cpListCertImpl = X509CertImpl.toImpl(cpListCert);
PolicyMappingsExtension policyMappingsExt =
cpListCertImpl.getPolicyMappingsExtension();
if (policyMappingsExt != null) {
policyMappingFound = true;
}
if (debug != null)
debug.println("policyMappingFound = " + policyMappingFound);
if (cert.equals(cpListCert)) {
if ((buildParams.policyMappingInhibited()) ||
(!policyMappingFound)){
if (debug != null)
debug.println("loop detected!!");
throw new CertPathValidatorException("loop detected");
}
}
}
}
/* check if target cert */
boolean finalCert = cert.getSubjectX500Principal().equals(buildParams.targetSubject());
/* check if CA cert */
boolean caCert = (cert.getBasicConstraints() != -1 ? true : false);
/* if there are more certs to follow, verify certain constraints */
if (!finalCert) {
/* check if CA cert */
if (!caCert)
throw new CertPathValidatorException("cert is NOT a CA cert");
/* If the certificate was not self-issued, verify that
* remainingCerts is greater than zero
*/
if ((currentState.remainingCACerts <= 0) && !X509CertImpl.isSelfIssued(cert)) {
throw new CertPathValidatorException
("pathLenConstraint violated, path too long", null,
null, -1, PKIXReason.PATH_TOO_LONG);
}
/*
* Check keyUsage extension (only if CA cert and not final cert)
*/
KeyChecker.verifyCAKeyUsage(cert);
} else {
/*
* If final cert, check that it satisfies specified target
* constraints
*/
if (targetCertConstraints.match(cert) == false) {
throw new CertPathValidatorException("target certificate " +
"constraints check failed");
}
}
/*
* Check revocation.
*/
if (buildParams.revocationEnabled() && currentState.revChecker != null) {
currentState.revChecker.check(cert, Collections.<String>emptySet());
}
/* Check name constraints if this is not a self-issued cert */
if (finalCert || !X509CertImpl.isSelfIssued(cert)){
if (currentState.nc != null) {
try {
if (!currentState.nc.verify(cert)){
throw new CertPathValidatorException
("name constraints check failed", null, null, -1,
PKIXReason.INVALID_NAME);
}
} catch (IOException ioe) {
throw new CertPathValidatorException(ioe);
}
}
}
/*
* Check policy
*/
X509CertImpl certImpl = X509CertImpl.toImpl(cert);
currentState.rootNode = PolicyChecker.processPolicies
(currentState.certIndex, initPolicies,
currentState.explicitPolicy, currentState.policyMapping,
currentState.inhibitAnyPolicy,
buildParams.policyQualifiersRejected(), currentState.rootNode,
certImpl, finalCert);
/*
* Check CRITICAL private extensions
*/
Set<String> unresolvedCritExts = cert.getCriticalExtensionOIDs();
if (unresolvedCritExts == null) {
unresolvedCritExts = Collections.<String>emptySet();
}
/*
* Check that the signature algorithm is not disabled.
*/
currentState.algorithmChecker.check(cert, unresolvedCritExts);
for (PKIXCertPathChecker checker : currentState.userCheckers) {
checker.check(cert, unresolvedCritExts);
}
/*
* Look at the remaining extensions and remove any ones we have
* already checked. If there are any left, throw an exception!
*/
if (!unresolvedCritExts.isEmpty()) {
unresolvedCritExts.remove(BasicConstraints_Id.toString());
unresolvedCritExts.remove(NameConstraints_Id.toString());
unresolvedCritExts.remove(CertificatePolicies_Id.toString());
unresolvedCritExts.remove(PolicyMappings_Id.toString());
unresolvedCritExts.remove(PolicyConstraints_Id.toString());
unresolvedCritExts.remove(InhibitAnyPolicy_Id.toString());
unresolvedCritExts.remove(SubjectAlternativeName_Id.toString());
unresolvedCritExts.remove(KeyUsage_Id.toString());
unresolvedCritExts.remove(ExtendedKeyUsage_Id.toString());
if (!unresolvedCritExts.isEmpty())
throw new CertPathValidatorException
("Unrecognized critical extension(s)", null, null, -1,
PKIXReason.UNRECOGNIZED_CRIT_EXT);
}
/*
* Check signature.
*/
if (buildParams.sigProvider() != null) {
cert.verify(currentState.pubKey, buildParams.sigProvider());
} else {
cert.verify(currentState.pubKey);
}
}
/**
* Verifies whether the input certificate completes the path.
* This checks whether the cert is the target certificate.
*
* @param cert the certificate to test
* @return a boolean value indicating whether the cert completes the path.
*/
@Override
boolean isPathCompleted(X509Certificate cert) {
return cert.getSubjectX500Principal().equals(buildParams.targetSubject());
}
/** Adds the certificate to the certPathList
*
* @param cert the certificate to be added
* @param certPathList the certification path list
*/
@Override
void addCertToPath(X509Certificate cert,
LinkedList<X509Certificate> certPathList) {
certPathList.addLast(cert);
}
/** Removes final certificate from the certPathList
*
* @param certPathList the certification path list
*/
@Override
void removeFinalCertFromPath(LinkedList<X509Certificate> certPathList) {
certPathList.removeLast();
}
}
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