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* Licensed to the Apache Software Foundation (ASF) under one
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing,
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
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*/
package org.apache.http.conn.ssl;
import java.io.IOException;
import java.io.InputStream;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import javax.security.auth.x500.X500Principal;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.conn.util.InetAddressUtils;
import org.apache.http.util.Args;
/**
* Abstract base class for all standard {@link X509HostnameVerifier}
* implementations.
*
* @since 4.0
*
* @deprecated (4.4) use an implementation of {@link javax.net.ssl.HostnameVerifier} or
* {@link DefaultHostnameVerifier}.
*/
@Deprecated
public abstract class AbstractVerifier implements X509HostnameVerifier {
private final Log log = LogFactory.getLog(getClass());
final static String[] BAD_COUNTRY_2LDS =
{ "ac", "co", "com", "ed", "edu", "go", "gouv", "gov", "info",
"lg", "ne", "net", "or", "org" };
static {
// Just in case developer forgot to manually sort the array. :-)
Arrays.sort(BAD_COUNTRY_2LDS);
}
@Override
public final void verify(final String host, final SSLSocket ssl)
throws IOException {
Args.notNull(host, "Host");
SSLSession session = ssl.getSession();
if(session == null) {
// In our experience this only happens under IBM 1.4.x when
// spurious (unrelated) certificates show up in the server'
// chain. Hopefully this will unearth the real problem:
final InputStream in = ssl.getInputStream();
in.available();
/*
If you're looking at the 2 lines of code above because
you're running into a problem, you probably have two
options:
#1. Clean up the certificate chain that your server
is presenting (e.g. edit "/etc/apache2/server.crt"
or wherever it is your server's certificate chain
is defined).
OR
#2. Upgrade to an IBM 1.5.x or greater JVM, or switch
to a non-IBM JVM.
*/
// If ssl.getInputStream().available() didn't cause an
// exception, maybe at least now the session is available?
session = ssl.getSession();
if(session == null) {
// If it's still null, probably a startHandshake() will
// unearth the real problem.
ssl.startHandshake();
// Okay, if we still haven't managed to cause an exception,
// might as well go for the NPE. Or maybe we're okay now?
session = ssl.getSession();
}
}
final Certificate[] certs = session.getPeerCertificates();
final X509Certificate x509 = (X509Certificate) certs[0];
verify(host, x509);
}
@Override
public final boolean verify(final String host, final SSLSession session) {
try {
final Certificate[] certs = session.getPeerCertificates();
final X509Certificate x509 = (X509Certificate) certs[0];
verify(host, x509);
return true;
} catch(final SSLException ex) {
if (log.isDebugEnabled()) {
log.debug(ex.getMessage(), ex);
}
return false;
}
}
@Override
public final void verify(
final String host, final X509Certificate cert) throws SSLException {
final boolean ipv4 = InetAddressUtils.isIPv4Address(host);
final boolean ipv6 = InetAddressUtils.isIPv6Address(host);
final int subjectType = ipv4 || ipv6 ? DefaultHostnameVerifier.IP_ADDRESS_TYPE : DefaultHostnameVerifier.DNS_NAME_TYPE;
final List<String> subjectAlts = DefaultHostnameVerifier.extractSubjectAlts(cert, subjectType);
final X500Principal subjectPrincipal = cert.getSubjectX500Principal();
final String cn = DefaultHostnameVerifier.extractCN(subjectPrincipal.getName(X500Principal.RFC2253));
verify(host,
cn != null ? new String[] {cn} : null,
subjectAlts != null && !subjectAlts.isEmpty() ? subjectAlts.toArray(new String[subjectAlts.size()]) : null);
}
public final void verify(final String host, final String[] cns,
final String[] subjectAlts,
final boolean strictWithSubDomains)
throws SSLException {
final String cn = cns != null && cns.length > 0 ? cns[0] : null;
final List<String> subjectAltList = subjectAlts != null && subjectAlts.length > 0 ? Arrays.asList(subjectAlts) : null;
final String normalizedHost = InetAddressUtils.isIPv6Address(host) ?
DefaultHostnameVerifier.normaliseAddress(host.toLowerCase(Locale.ROOT)) : host;
if (subjectAltList != null) {
for (final String subjectAlt: subjectAltList) {
final String normalizedAltSubject = InetAddressUtils.isIPv6Address(subjectAlt) ?
DefaultHostnameVerifier.normaliseAddress(subjectAlt) : subjectAlt;
if (matchIdentity(normalizedHost, normalizedAltSubject, strictWithSubDomains)) {
return;
}
}
throw new SSLException("Certificate for <" + host + "> doesn't match any " +
"of the subject alternative names: " + subjectAltList);
} else if (cn != null) {
final String normalizedCN = InetAddressUtils.isIPv6Address(cn) ?
DefaultHostnameVerifier.normaliseAddress(cn) : cn;
if (matchIdentity(normalizedHost, normalizedCN, strictWithSubDomains)) {
return;
}
throw new SSLException("Certificate for <" + host + "> doesn't match " +
"common name of the certificate subject: " + cn);
} else {
throw new SSLException("Certificate subject for <" + host + "> doesn't contain " +
"a common name and does not have alternative names");
}
}
private static boolean matchIdentity(final String host, final String identity, final boolean strict) {
if (host == null) {
return false;
}
final String normalizedHost = host.toLowerCase(Locale.ROOT);
final String normalizedIdentity = identity.toLowerCase(Locale.ROOT);
// The CN better have at least two dots if it wants wildcard
// action. It also can't be [*.co.uk] or [*.co.jp] or
// [*.org.uk], etc...
final String parts[] = normalizedIdentity.split("\\.");
final boolean doWildcard = parts.length >= 3 && parts[0].endsWith("*") &&
(!strict || validCountryWildcard(parts));
if (doWildcard) {
boolean match;
final String firstpart = parts[0];
if (firstpart.length() > 1) { // e.g. server*
final String prefix = firstpart.substring(0, firstpart.length() - 1); // e.g. server
final String suffix = normalizedIdentity.substring(firstpart.length()); // skip wildcard part from cn
final String hostSuffix = normalizedHost.substring(prefix.length()); // skip wildcard part from normalizedHost
match = normalizedHost.startsWith(prefix) && hostSuffix.endsWith(suffix);
} else {
match = normalizedHost.endsWith(normalizedIdentity.substring(1));
}
return match && (!strict || countDots(normalizedHost) == countDots(normalizedIdentity));
} else {
return normalizedHost.equals(normalizedIdentity);
}
}
private static boolean validCountryWildcard(final String parts[]) {
if (parts.length != 3 || parts[2].length() != 2) {
return true; // it's not an attempt to wildcard a 2TLD within a country code
}
return Arrays.binarySearch(BAD_COUNTRY_2LDS, parts[1]) < 0;
}
public static boolean acceptableCountryWildcard(final String cn) {
return validCountryWildcard(cn.split("\\."));
}
public static String[] getCNs(final X509Certificate cert) {
final String subjectPrincipal = cert.getSubjectX500Principal().toString();
try {
final String cn = DefaultHostnameVerifier.extractCN(subjectPrincipal);
return cn != null ? new String[] { cn } : null;
} catch (final SSLException ex) {
return null;
}
}
/**
* Extracts the array of SubjectAlt DNS names from an X509Certificate.
* Returns null if there aren't any.
* <p>
* Note: Java doesn't appear able to extract international characters
* from the SubjectAlts. It can only extract international characters
* from the CN field.
* </p>
* <p>
* (Or maybe the version of OpenSSL I'm using to test isn't storing the
* international characters correctly in the SubjectAlts?).
* </p>
*
* @param cert X509Certificate
* @return Array of SubjectALT DNS names stored in the certificate.
*/
public static String[] getDNSSubjectAlts(final X509Certificate cert) {
final List<String> subjectAlts = DefaultHostnameVerifier.extractSubjectAlts(
cert, DefaultHostnameVerifier.DNS_NAME_TYPE);
return subjectAlts != null && !subjectAlts.isEmpty() ?
subjectAlts.toArray(new String[subjectAlts.size()]) : null;
}
/**
* Counts the number of dots "." in a string.
* @param s string to count dots from
* @return number of dots
*/
public static int countDots(final String s) {
int count = 0;
for(int i = 0; i < s.length(); i++) {
if(s.charAt(i) == '.') {
count++;
}
}
return count;
}
}