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Apache HttpComponents Client
/*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* 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 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 (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 (SSLException ex) {
return null;
}
}
/**
* Extracts the array of SubjectAlt DNS names from an X509Certificate.
* Returns null if there aren't any.
*
* Note: Java doesn't appear able to extract international characters
* from the SubjectAlts. It can only extract international characters
* from the CN field.
*
*
* (Or maybe the version of OpenSSL I'm using to test isn't storing the
* international characters correctly in the SubjectAlts?).
*
*
* @param cert X509Certificate
* @return Array of SubjectALT DNS names stored in the certificate.
*/
public static String[] getDNSSubjectAlts(final X509Certificate cert) {
final List 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;
}
}