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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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 with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "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.
*/
package okhttp3.internal.tls;
import java.security.cert.Certificate;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;
import javax.security.auth.x500.X500Principal;
import static okhttp3.internal.Util.verifyAsIpAddress;
/**
* A HostnameVerifier consistent with RFC 2818.
*/
public final class OkHostnameVerifier implements HostnameVerifier {
public static final OkHostnameVerifier INSTANCE = new OkHostnameVerifier();
private static final int ALT_DNS_NAME = 2;
private static final int ALT_IPA_NAME = 7;
private OkHostnameVerifier() {
}
@Override
public boolean verify(String host, SSLSession session) {
try {
Certificate[] certificates = session.getPeerCertificates();
return verify(host, (X509Certificate) certificates[0]);
} catch (SSLException e) {
return false;
}
}
public boolean verify(String host, X509Certificate certificate) {
return verifyAsIpAddress(host)
? verifyIpAddress(host, certificate)
: verifyHostname(host, certificate);
}
/** Returns true if {@code certificate} matches {@code ipAddress}. */
private boolean verifyIpAddress(String ipAddress, X509Certificate certificate) {
List altNames = getSubjectAltNames(certificate, ALT_IPA_NAME);
for (int i = 0, size = altNames.size(); i < size; i++) {
if (ipAddress.equalsIgnoreCase(altNames.get(i))) {
return true;
}
}
return false;
}
/** Returns true if {@code certificate} matches {@code hostname}. */
private boolean verifyHostname(String hostname, X509Certificate certificate) {
hostname = hostname.toLowerCase(Locale.US);
boolean hasDns = false;
List altNames = getSubjectAltNames(certificate, ALT_DNS_NAME);
for (int i = 0, size = altNames.size(); i < size; i++) {
hasDns = true;
if (verifyHostname(hostname, altNames.get(i))) {
return true;
}
}
if (!hasDns) {
X500Principal principal = certificate.getSubjectX500Principal();
// RFC 2818 advises using the most specific name for matching.
String cn = new DistinguishedNameParser(principal).findMostSpecific("cn");
if (cn != null) {
return verifyHostname(hostname, cn);
}
}
return false;
}
public static List allSubjectAltNames(X509Certificate certificate) {
List altIpaNames = getSubjectAltNames(certificate, ALT_IPA_NAME);
List altDnsNames = getSubjectAltNames(certificate, ALT_DNS_NAME);
List result = new ArrayList<>(altIpaNames.size() + altDnsNames.size());
result.addAll(altIpaNames);
result.addAll(altDnsNames);
return result;
}
private static List getSubjectAltNames(X509Certificate certificate, int type) {
List result = new ArrayList<>();
try {
Collection subjectAltNames = certificate.getSubjectAlternativeNames();
if (subjectAltNames == null) {
return Collections.emptyList();
}
for (Object subjectAltName : subjectAltNames) {
List entry = (List) subjectAltName;
if (entry == null || entry.size() < 2) {
continue;
}
Integer altNameType = (Integer) entry.get(0);
if (altNameType == null) {
continue;
}
if (altNameType == type) {
String altName = (String) entry.get(1);
if (altName != null) {
result.add(altName);
}
}
}
return result;
} catch (CertificateParsingException e) {
return Collections.emptyList();
}
}
/**
* Returns {@code true} iff {@code hostname} matches the domain name {@code pattern}.
*
* @param hostname lower-case host name.
* @param pattern domain name pattern from certificate. May be a wildcard pattern such as {@code
* *.android.com}.
*/
private boolean verifyHostname(String hostname, String pattern) {
// Basic sanity checks
// Check length == 0 instead of .isEmpty() to support Java 5.
if ((hostname == null) || (hostname.length() == 0) || (hostname.startsWith("."))
|| (hostname.endsWith(".."))) {
// Invalid domain name
return false;
}
if ((pattern == null) || (pattern.length() == 0) || (pattern.startsWith("."))
|| (pattern.endsWith(".."))) {
// Invalid pattern/domain name
return false;
}
// Normalize hostname and pattern by turning them into absolute domain names if they are not
// yet absolute. This is needed because server certificates do not normally contain absolute
// names or patterns, but they should be treated as absolute. At the same time, any hostname
// presented to this method should also be treated as absolute for the purposes of matching
// to the server certificate.
// www.android.com matches www.android.com
// www.android.com matches www.android.com.
// www.android.com. matches www.android.com.
// www.android.com. matches www.android.com
if (!hostname.endsWith(".")) {
hostname += '.';
}
if (!pattern.endsWith(".")) {
pattern += '.';
}
// hostname and pattern are now absolute domain names.
pattern = pattern.toLowerCase(Locale.US);
// hostname and pattern are now in lower case -- domain names are case-insensitive.
if (!pattern.contains("*")) {
// Not a wildcard pattern -- hostname and pattern must match exactly.
return hostname.equals(pattern);
}
// Wildcard pattern
// WILDCARD PATTERN RULES:
// 1. Asterisk (*) is only permitted in the left-most domain name label and must be the
// only character in that label (i.e., must match the whole left-most label).
// For example, *.example.com is permitted, while *a.example.com, a*.example.com,
// a*b.example.com, a.*.example.com are not permitted.
// 2. Asterisk (*) cannot match across domain name labels.
// For example, *.example.com matches test.example.com but does not match
// sub.test.example.com.
// 3. Wildcard patterns for single-label domain names are not permitted.
if ((!pattern.startsWith("*.")) || (pattern.indexOf('*', 1) != -1)) {
// Asterisk (*) is only permitted in the left-most domain name label and must be the only
// character in that label
return false;
}
// Optimization: check whether hostname is too short to match the pattern. hostName must be at
// least as long as the pattern because asterisk must match the whole left-most label and
// hostname starts with a non-empty label. Thus, asterisk has to match one or more characters.
if (hostname.length() < pattern.length()) {
// hostname too short to match the pattern.
return false;
}
if ("*.".equals(pattern)) {
// Wildcard pattern for single-label domain name -- not permitted.
return false;
}
// hostname must end with the region of pattern following the asterisk.
String suffix = pattern.substring(1);
if (!hostname.endsWith(suffix)) {
// hostname does not end with the suffix
return false;
}
// Check that asterisk did not match across domain name labels.
int suffixStartIndexInHostname = hostname.length() - suffix.length();
if ((suffixStartIndexInHostname > 0)
&& (hostname.lastIndexOf('.', suffixStartIndexInHostname - 1) != -1)) {
// Asterisk is matching across domain name labels -- not permitted.
return false;
}
// hostname matches pattern
return true;
}
}
