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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
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package sun.security.provider.certpath;
import java.io.InputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URLConnection;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.CertSelector;
import java.security.cert.CertStore;
import java.security.cert.CertStoreException;
import java.security.cert.CertStoreParameters;
import java.security.cert.CertStoreSpi;
import java.security.cert.CRLException;
import java.security.cert.CRLSelector;
import java.security.cert.X509Certificate;
import java.security.cert.X509CertSelector;
import java.security.cert.X509CRL;
import java.security.cert.X509CRLSelector;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import sun.security.action.GetIntegerAction;
import sun.security.x509.AccessDescription;
import sun.security.x509.GeneralNameInterface;
import sun.security.x509.URIName;
import sun.security.util.Cache;
import sun.security.util.Debug;
/**
* A <code>CertStore</code> that retrieves <code>Certificates</code> or
* <code>CRL</code>s from a URI, for example, as specified in an X.509
* AuthorityInformationAccess or CRLDistributionPoint extension.
* <p>
* For CRLs, this implementation retrieves a single DER encoded CRL per URI.
* For Certificates, this implementation retrieves a single DER encoded CRL or
* a collection of Certificates encoded as a PKCS#7 "certs-only" CMS message.
* <p>
* This <code>CertStore</code> also implements Certificate/CRL caching.
* Currently, the cache is shared between all applications in the VM and uses a
* hardcoded policy. The cache has a maximum size of 185 entries, which are held
* by SoftReferences. A request will be satisfied from the cache if we last
* checked for an update within CHECK_INTERVAL (last 30 seconds). Otherwise,
* we open an URLConnection to download the Certificate(s)/CRL using an
* If-Modified-Since request (HTTP) if possible. Note that both positive and
* negative responses are cached, i.e. if we are unable to open the connection
* or the Certificate(s)/CRL cannot be parsed, we remember this result and
* additional calls during the CHECK_INTERVAL period do not try to open another
* connection.
* <p>
* The URICertStore is not currently a standard CertStore type. We should
* consider adding a standard "URI" CertStore type.
*
* @author Andreas Sterbenz
* @author Sean Mullan
* @since 7.0
*/
class URICertStore extends CertStoreSpi {
private static final Debug debug = Debug.getInstance("certpath");
// interval between checks for update of cached Certificates/CRLs
// (30 seconds)
private final static int CHECK_INTERVAL = 30 * 1000;
// size of the cache (see Cache class for sizing recommendations)
private final static int CACHE_SIZE = 185;
// X.509 certificate factory instance
private final CertificateFactory factory;
// cached Collection of X509Certificates (may be empty, never null)
private Collection<X509Certificate> certs = Collections.emptySet();
// cached X509CRL (may be null)
private X509CRL crl;
// time we last checked for an update
private long lastChecked;
// time server returned as last modified time stamp
// or 0 if not available
private long lastModified;
// the URI of this CertStore
private URI uri;
// true if URI is ldap
private boolean ldap = false;
private CertStoreHelper ldapHelper;
private CertStore ldapCertStore;
private String ldapPath;
// Default maximum connect timeout in milliseconds (15 seconds)
// allowed when downloading CRLs
private static final int DEFAULT_CRL_CONNECT_TIMEOUT = 15000;
/**
* Integer value indicating the connect timeout, in seconds, to be
* used for the CRL download. A timeout of zero is interpreted as
* an infinite timeout.
*/
private static final int CRL_CONNECT_TIMEOUT = initializeTimeout();
/**
* Initialize the timeout length by getting the CRL timeout
* system property. If the property has not been set, or if its
* value is negative, set the timeout length to the default.
*/
private static int initializeTimeout() {
Integer tmp = java.security.AccessController.doPrivileged(
new GetIntegerAction("com.sun.security.crl.timeout"));
if (tmp == null || tmp < 0) {
return DEFAULT_CRL_CONNECT_TIMEOUT;
}
// Convert to milliseconds, as the system property will be
// specified in seconds
return tmp * 1000;
}
/**
* Creates a URICertStore.
*
* @param parameters specifying the URI
*/
URICertStore(CertStoreParameters params)
throws InvalidAlgorithmParameterException, NoSuchAlgorithmException {
super(params);
if (!(params instanceof URICertStoreParameters)) {
throw new InvalidAlgorithmParameterException
("params must be instanceof URICertStoreParameters");
}
this.uri = ((URICertStoreParameters) params).uri;
// if ldap URI, use an LDAPCertStore to fetch certs and CRLs
if (uri.getScheme().toLowerCase(Locale.ENGLISH).equals("ldap")) {
ldap = true;
ldapHelper = CertStoreHelper.getInstance("LDAP");
ldapCertStore = ldapHelper.getCertStore(uri);
ldapPath = uri.getPath();
// strip off leading '/'
if (ldapPath.charAt(0) == '/') {
ldapPath = ldapPath.substring(1);
}
}
try {
factory = CertificateFactory.getInstance("X.509");
} catch (CertificateException e) {
throw new RuntimeException();
}
}
/**
* Returns a URI CertStore. This method consults a cache of
* CertStores (shared per JVM) using the URI as a key.
*/
private static final Cache<URICertStoreParameters, CertStore>
certStoreCache = Cache.newSoftMemoryCache(CACHE_SIZE);
static synchronized CertStore getInstance(URICertStoreParameters params)
throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
if (debug != null) {
debug.println("CertStore URI:" + params.uri);
}
CertStore ucs = certStoreCache.get(params);
if (ucs == null) {
ucs = new UCS(new URICertStore(params), null, "URI", params);
certStoreCache.put(params, ucs);
} else {
if (debug != null) {
debug.println("URICertStore.getInstance: cache hit");
}
}
return ucs;
}
/**
* Creates a CertStore from information included in the AccessDescription
* object of a certificate's Authority Information Access Extension.
*/
static CertStore getInstance(AccessDescription ad) {
if (!ad.getAccessMethod().equals((Object)
AccessDescription.Ad_CAISSUERS_Id)) {
return null;
}
GeneralNameInterface gn = ad.getAccessLocation().getName();
if (!(gn instanceof URIName)) {
return null;
}
URI uri = ((URIName) gn).getURI();
try {
return URICertStore.getInstance
(new URICertStore.URICertStoreParameters(uri));
} catch (Exception ex) {
if (debug != null) {
debug.println("exception creating CertStore: " + ex);
ex.printStackTrace();
}
return null;
}
}
/**
* Returns a <code>Collection</code> of <code>X509Certificate</code>s that
* match the specified selector. If no <code>X509Certificate</code>s
* match the selector, an empty <code>Collection</code> will be returned.
*
* @param selector a <code>CertSelector</code> used to select which
* <code>X509Certificate</code>s should be returned. Specify
* <code>null</code> to return all <code>X509Certificate</code>s.
* @return a <code>Collection</code> of <code>X509Certificate</code>s that
* match the specified selector
* @throws CertStoreException if an exception occurs
*/
@Override
@SuppressWarnings("unchecked")
public synchronized Collection<X509Certificate> engineGetCertificates
(CertSelector selector) throws CertStoreException {
// if ldap URI we wrap the CertSelector in an LDAPCertSelector to
// avoid LDAP DN matching issues (see LDAPCertSelector for more info)
if (ldap) {
X509CertSelector xsel = (X509CertSelector) selector;
try {
xsel = ldapHelper.wrap(xsel, xsel.getSubject(), ldapPath);
} catch (IOException ioe) {
throw new CertStoreException(ioe);
}
// Fetch the certificates via LDAP. LDAPCertStore has its own
// caching mechanism, see the class description for more info.
// Safe cast since xsel is an X509 certificate selector.
return (Collection<X509Certificate>)
ldapCertStore.getCertificates(xsel);
}
// Return the Certificates for this entry. It returns the cached value
// if it is still current and fetches the Certificates otherwise.
// For the caching details, see the top of this class.
long time = System.currentTimeMillis();
if (time - lastChecked < CHECK_INTERVAL) {
if (debug != null) {
debug.println("Returning certificates from cache");
}
return getMatchingCerts(certs, selector);
}
lastChecked = time;
try {
URLConnection connection = uri.toURL().openConnection();
if (lastModified != 0) {
connection.setIfModifiedSince(lastModified);
}
long oldLastModified = lastModified;
try (InputStream in = connection.getInputStream()) {
lastModified = connection.getLastModified();
if (oldLastModified != 0) {
if (oldLastModified == lastModified) {
if (debug != null) {
debug.println("Not modified, using cached copy");
}
return getMatchingCerts(certs, selector);
} else if (connection instanceof HttpURLConnection) {
// some proxy servers omit last modified
HttpURLConnection hconn = (HttpURLConnection)connection;
if (hconn.getResponseCode()
== HttpURLConnection.HTTP_NOT_MODIFIED) {
if (debug != null) {
debug.println("Not modified, using cached copy");
}
return getMatchingCerts(certs, selector);
}
}
}
if (debug != null) {
debug.println("Downloading new certificates...");
}
// Safe cast since factory is an X.509 certificate factory
certs = (Collection<X509Certificate>)
factory.generateCertificates(in);
}
return getMatchingCerts(certs, selector);
} catch (IOException | CertificateException e) {
if (debug != null) {
debug.println("Exception fetching certificates:");
e.printStackTrace();
}
}
// exception, forget previous values
lastModified = 0;
certs = Collections.emptySet();
return certs;
}
/**
* Iterates over the specified Collection of X509Certificates and
* returns only those that match the criteria specified in the
* CertSelector.
*/
private static Collection<X509Certificate> getMatchingCerts
(Collection<X509Certificate> certs, CertSelector selector) {
// if selector not specified, all certs match
if (selector == null) {
return certs;
}
List<X509Certificate> matchedCerts = new ArrayList<>(certs.size());
for (X509Certificate cert : certs) {
if (selector.match(cert)) {
matchedCerts.add(cert);
}
}
return matchedCerts;
}
/**
* Returns a <code>Collection</code> of <code>X509CRL</code>s that
* match the specified selector. If no <code>X509CRL</code>s
* match the selector, an empty <code>Collection</code> will be returned.
*
* @param selector A <code>CRLSelector</code> used to select which
* <code>X509CRL</code>s should be returned. Specify <code>null</code>
* to return all <code>X509CRL</code>s.
* @return A <code>Collection</code> of <code>X509CRL</code>s that
* match the specified selector
* @throws CertStoreException if an exception occurs
*/
@Override
@SuppressWarnings("unchecked")
public synchronized Collection<X509CRL> engineGetCRLs(CRLSelector selector)
throws CertStoreException {
// if ldap URI we wrap the CRLSelector in an LDAPCRLSelector to
// avoid LDAP DN matching issues (see LDAPCRLSelector for more info)
if (ldap) {
X509CRLSelector xsel = (X509CRLSelector) selector;
try {
xsel = ldapHelper.wrap(xsel, null, ldapPath);
} catch (IOException ioe) {
throw new CertStoreException(ioe);
}
// Fetch the CRLs via LDAP. LDAPCertStore has its own
// caching mechanism, see the class description for more info.
// Safe cast since xsel is an X509 certificate selector.
try {
return (Collection<X509CRL>) ldapCertStore.getCRLs(xsel);
} catch (CertStoreException cse) {
throw new PKIX.CertStoreTypeException("LDAP", cse);
}
}
// Return the CRLs for this entry. It returns the cached value
// if it is still current and fetches the CRLs otherwise.
// For the caching details, see the top of this class.
long time = System.currentTimeMillis();
if (time - lastChecked < CHECK_INTERVAL) {
if (debug != null) {
debug.println("Returning CRL from cache");
}
return getMatchingCRLs(crl, selector);
}
lastChecked = time;
try {
URLConnection connection = uri.toURL().openConnection();
if (lastModified != 0) {
connection.setIfModifiedSince(lastModified);
}
long oldLastModified = lastModified;
connection.setConnectTimeout(CRL_CONNECT_TIMEOUT);
try (InputStream in = connection.getInputStream()) {
lastModified = connection.getLastModified();
if (oldLastModified != 0) {
if (oldLastModified == lastModified) {
if (debug != null) {
debug.println("Not modified, using cached copy");
}
return getMatchingCRLs(crl, selector);
} else if (connection instanceof HttpURLConnection) {
// some proxy servers omit last modified
HttpURLConnection hconn = (HttpURLConnection)connection;
if (hconn.getResponseCode()
== HttpURLConnection.HTTP_NOT_MODIFIED) {
if (debug != null) {
debug.println("Not modified, using cached copy");
}
return getMatchingCRLs(crl, selector);
}
}
}
if (debug != null) {
debug.println("Downloading new CRL...");
}
crl = (X509CRL) factory.generateCRL(in);
}
return getMatchingCRLs(crl, selector);
} catch (IOException | CRLException e) {
if (debug != null) {
debug.println("Exception fetching CRL:");
e.printStackTrace();
}
// exception, forget previous values
lastModified = 0;
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