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package sun.security.provider.certpath;
import java.io.IOException;
import java.security.PublicKey;
import java.security.cert.CertificateException;
import java.security.cert.CertPathValidatorException;
import java.security.cert.PKIXCertPathChecker;
import java.security.cert.PKIXRevocationChecker;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.ListIterator;
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.NameConstraintsExtension;
import sun.security.x509.SubjectKeyIdentifierExtension;
import sun.security.x509.X509CertImpl;
/**
* A specification of a reverse PKIX validation state
* which is initialized by each build and updated each time a
* certificate is added to the current path.
* @since 1.4
* @author Sean Mullan
* @author Yassir Elley
*/
class ReverseState implements State {
private static final Debug debug = Debug.getInstance("certpath");
/* The subject DN of the last cert in the path */
X500Principal subjectDN;
/* The subject public key of the last cert */
PublicKey pubKey;
/* The subject key identifier extension (if any) of the last cert */
SubjectKeyIdentifierExtension subjKeyId;
/* The PKIX constrained/excluded subtrees state variable */
NameConstraintsExtension nc;
/* The PKIX explicit policy, policy mapping, and inhibit_any-policy
state variables */
int explicitPolicy;
int policyMapping;
int inhibitAnyPolicy;
int certIndex;
PolicyNodeImpl rootNode;
/* The number of remaining CA certs which may follow in the path.
* -1: previous cert was an EE cert
* 0: only EE certs may follow.
* >0 and <Integer.MAX_VALUE:no more than this number of CA certs may follow
* Integer.MAX_VALUE: unlimited
*/
int remainingCACerts;
/* The list of user-defined checkers retrieved from the PKIXParameters
* instance */
ArrayList<PKIXCertPathChecker> userCheckers;
/* Flag indicating if state is initial (path is just starting) */
private boolean init = true;
/* the checker used for revocation status */
RevocationChecker revChecker;
/* the algorithm checker */
AlgorithmChecker algorithmChecker;
/* the untrusted certificates checker */
UntrustedChecker untrustedChecker;
/* the trust anchor used to validate the path */
TrustAnchor trustAnchor;
/* Flag indicating if current cert can vouch for the CRL for
* the next cert
*/
boolean crlSign = true;
/**
* Returns a boolean flag indicating if the state is initial
* (just starting)
*
* @return boolean flag indicating if the state is initial (just starting)
*/
@Override
public boolean isInitial() {
return init;
}
/**
* Display state for debugging purposes
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("State [");
sb.append("\n subjectDN of last cert: ").append(subjectDN);
sb.append("\n subjectKeyIdentifier: ").append
(String.valueOf(subjKeyId));
sb.append("\n nameConstraints: ").append(String.valueOf(nc));
sb.append("\n certIndex: ").append(certIndex);
sb.append("\n explicitPolicy: ").append(explicitPolicy);
sb.append("\n policyMapping: ").append(policyMapping);
sb.append("\n inhibitAnyPolicy: ").append(inhibitAnyPolicy);
sb.append("\n rootNode: ").append(rootNode);
sb.append("\n remainingCACerts: ").append(remainingCACerts);
sb.append("\n crlSign: ").append(crlSign);
sb.append("\n init: ").append(init);
sb.append("\n]\n");
return sb.toString();
}
/**
* Initialize the state.
*
* @param buildParams builder parameters
*/
public void initState(BuilderParams buildParams)
throws CertPathValidatorException
{
/*
* Initialize number of remainingCACerts.
* Note that -1 maxPathLen implies unlimited.
* 0 implies only an EE cert is acceptable.
*/
int maxPathLen = buildParams.maxPathLength();
remainingCACerts = (maxPathLen == -1) ? Integer.MAX_VALUE
: maxPathLen;
/* Initialize explicit policy state variable */
if (buildParams.explicitPolicyRequired()) {
explicitPolicy = 0;
} else {
// unconstrained if maxPathLen is -1,
// otherwise, we want to initialize this to the value of the
// longest possible path + 1 (i.e. maxpathlen + finalcert + 1)
explicitPolicy = (maxPathLen == -1) ? maxPathLen : maxPathLen + 2;
}
/* Initialize policy mapping state variable */
if (buildParams.policyMappingInhibited()) {
policyMapping = 0;
} else {
policyMapping = (maxPathLen == -1) ? maxPathLen : maxPathLen + 2;
}
/* Initialize inhibit any policy state variable */
if (buildParams.anyPolicyInhibited()) {
inhibitAnyPolicy = 0;
} else {
inhibitAnyPolicy = (maxPathLen == -1) ? maxPathLen : maxPathLen + 2;
}
/* Initialize certIndex */
certIndex = 1;
/* Initialize policy tree */
Set<String> initExpPolSet = new HashSet<>(1);
initExpPolSet.add(PolicyChecker.ANY_POLICY);
rootNode = new PolicyNodeImpl(null, PolicyChecker.ANY_POLICY, null,
false, initExpPolSet, false);
/*
* Initialize each user-defined checker
* Shallow copy the checkers
*/
userCheckers = new ArrayList<>(buildParams.certPathCheckers());
/* initialize each checker (just in case) */
for (PKIXCertPathChecker checker : userCheckers) {
checker.init(false);
}
/* Start by trusting the cert to sign CRLs */
crlSign = true;
init = true;
}
/**
* Update the state with the specified trust anchor.
*
* @param anchor the most-trusted CA
* @param buildParams builder parameters
*/
public void updateState(TrustAnchor anchor, BuilderParams buildParams)
throws CertificateException, IOException, CertPathValidatorException
{
trustAnchor = anchor;
X509Certificate trustedCert = anchor.getTrustedCert();
if (trustedCert != null) {
updateState(trustedCert);
} else {
X500Principal caName = anchor.getCA();
updateState(anchor.getCAPublicKey(), caName);
}
// The user specified AlgorithmChecker and RevocationChecker may not be
// able to set the trust anchor until now.
boolean revCheckerAdded = false;
for (PKIXCertPathChecker checker : userCheckers) {
if (checker instanceof AlgorithmChecker) {
((AlgorithmChecker)checker).trySetTrustAnchor(anchor);
} else if (checker instanceof PKIXRevocationChecker) {
if (revCheckerAdded) {
throw new CertPathValidatorException(
"Only one PKIXRevocationChecker can be specified");
}
// if it's our own, initialize it
if (checker instanceof RevocationChecker) {
((RevocationChecker)checker).init(anchor, buildParams);
}
((PKIXRevocationChecker)checker).init(false);
revCheckerAdded = true;
}
}
// only create a RevocationChecker if revocation is enabled and
// a PKIXRevocationChecker has not already been added
if (buildParams.revocationEnabled() && !revCheckerAdded) {
revChecker = new RevocationChecker(anchor, buildParams);
revChecker.init(false);
}
init = false;
}
/**
* Update the state. This method is used when the most-trusted CA is
* a trusted public-key and caName, instead of a trusted cert.
*
* @param pubKey the public key of the trusted CA
* @param subjectDN the subject distinguished name of the trusted CA
*/
private void updateState(PublicKey pubKey, X500Principal subjectDN) {
/* update subject DN */
this.subjectDN = subjectDN;
/* update subject public key */
this.pubKey = pubKey;
}
/**
* Update the state with the next certificate added to the path.
*
* @param cert the certificate which is used to update the state
*/
public void updateState(X509Certificate cert)
throws CertificateException, IOException, CertPathValidatorException {
if (cert == null) {
return;
}
/* update subject DN */
subjectDN = cert.getSubjectX500Principal();
/* check for key needing to inherit alg parameters */
X509CertImpl icert = X509CertImpl.toImpl(cert);
PublicKey newKey = cert.getPublicKey();
if (PKIX.isDSAPublicKeyWithoutParams(newKey)) {
newKey = BasicChecker.makeInheritedParamsKey(newKey, pubKey);
}
/* update subject public key */
pubKey = newKey;
/*
* if this is a trusted cert (init == true), then we
* don't update any of the remaining fields
*/
if (init) {
init = false;
return;
}
/* update subject key identifier */
subjKeyId = icert.getSubjectKeyIdentifierExtension();
/* update crlSign */
crlSign = RevocationChecker.certCanSignCrl(cert);
/* update current name constraints */
if (nc != null) {
nc.merge(icert.getNameConstraintsExtension());
} else {
nc = icert.getNameConstraintsExtension();
if (nc != null) {
// Make sure we do a clone here, because we're probably
// going to modify this object later and we don't want to
// be sharing it with a Certificate object!
nc = (NameConstraintsExtension) nc.clone();
}
}
/* update policy state variables */
explicitPolicy =
PolicyChecker.mergeExplicitPolicy(explicitPolicy, icert, false);
policyMapping =
PolicyChecker.mergePolicyMapping(policyMapping, icert);
inhibitAnyPolicy =
PolicyChecker.mergeInhibitAnyPolicy(inhibitAnyPolicy, icert);
certIndex++;
/*
* Update remaining CA certs
*/
remainingCACerts =
ConstraintsChecker.mergeBasicConstraints(cert, remainingCACerts);
init = false;
}
/**
* Returns a boolean flag indicating if a key lacking necessary key
* algorithm parameters has been encountered.
*
* @return boolean flag indicating if key lacking parameters encountered.
*/
@Override
public boolean keyParamsNeeded() {
/* when building in reverse, we immediately get parameters needed
* or else throw an exception
*/
return false;
}
/*
* Clone current state. The state is cloned as each cert is
* added to the path. This is necessary if backtracking occurs,
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