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package org.treeleafj.xmax.http.basic.ssl;
import org.slf4j.LoggerFactory;
import org.treeleafj.xmax.http.basic.InetAddressUtils;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.cert.Certificate;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.StringTokenizer;
/**
* Created by leaf on 2016/3/18.
*/
public abstract class AbstractVerifier implements X509HostnameVerifier {
/**
* This contains a list of 2nd-level domains that aren't allowed to
* have wildcards when combined with country-codes.
* For example: [*.co.uk].
*
* The [*.co.uk] problem is an interesting one. Should we just hope
* that CA's would never foolishly allow such a certificate to happen?
* Looks like we're the only implementation guarding against this.
* Firefox, Curl, Sun Java 1.4, 5, 6 don't bother with this check.
*/
private 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);
}
private final org.slf4j.Logger log = LoggerFactory.getLogger(getClass());
public AbstractVerifier() {
super();
}
public final void verify(final String host, final SSLSocket ssl)
throws IOException {
if (host == null) {
throw new NullPointerException("host to verify is null");
}
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);
}
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 e) {
return false;
}
}
public final void verify(final String host, final X509Certificate cert)
throws SSLException {
final String[] cns = getCNs(cert);
final String[] subjectAlts = getSubjectAlts(cert, host);
verify(host, cns, subjectAlts);
}
public final void verify(final String host, final String[] cns,
final String[] subjectAlts,
final boolean strictWithSubDomains)
throws SSLException {
// Build the list of names we're going to check. Our DEFAULT and
// STRICT implementations of the HostnameVerifier only use the
// first CN provided. All other CNs are ignored.
// (Firefox, wget, curl, Sun Java 1.4, 5, 6 all work this way).
final LinkedList names = new LinkedList();
if (cns != null && cns.length > 0 && cns[0] != null) {
names.add(cns[0]);
}
if (subjectAlts != null) {
for (final String subjectAlt : subjectAlts) {
if (subjectAlt != null) {
names.add(subjectAlt);
}
}
}
if (names.isEmpty()) {
final String msg = "Certificate for <" + host + "> doesn't contain CN or DNS subjectAlt";
throw new SSLException(msg);
}
// StringBuilder for building the error message.
final StringBuilder buf = new StringBuilder();
// We're can be case-insensitive when comparing the host we used to
// establish the socket to the hostname in the certificate.
final String hostName = normaliseIPv6Address(host.trim().toLowerCase(Locale.ENGLISH));
boolean match = false;
for (final Iterator it = names.iterator(); it.hasNext(); ) {
// Don't trim the CN, though!
String cn = it.next();
cn = cn.toLowerCase(Locale.ENGLISH);
// Store CN in StringBuilder in case we need to report an error.
buf.append(" <");
buf.append(cn);
buf.append('>');
if (it.hasNext()) {
buf.append(" OR");
}
// 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[] = cn.split("\\.");
final boolean doWildcard =
parts.length >= 3 && parts[0].endsWith("*") &&
validCountryWildcard(cn) && !isIPAddress(host);
if (doWildcard) {
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 = cn.substring(firstpart.length()); // skip wildcard part from cn
final String hostSuffix = hostName.substring(prefix.length()); // skip wildcard part from host
match = hostName.startsWith(prefix) && hostSuffix.endsWith(suffix);
} else {
match = hostName.endsWith(cn.substring(1));
}
if (match && strictWithSubDomains) {
// If we're in strict mode, then [*.foo.com] is not
// allowed to match [a.b.foo.com]
match = countDots(hostName) == countDots(cn);
}
} else {
match = hostName.equals(normaliseIPv6Address(cn));
}
if (match) {
break;
}
}
if (!match) {
throw new SSLException("hostname in certificate didn't match: <" + host + "> !=" + buf);
}
}
/**
* @deprecated (4.3.1) should not be a part of public APIs.
*/
@Deprecated
public static boolean acceptableCountryWildcard(final String cn) {
final String parts[] = cn.split("\\.");
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;
}
boolean validCountryWildcard(final String cn) {
final String parts[] = cn.split("\\.");
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 String[] getCNs(final X509Certificate cert) {
final LinkedList cnList = new LinkedList();
/*
Sebastian Hauer's original StrictSSLProtocolSocketFactory used
getName() and had the following comment:
Parses a X.500 distinguished name for the value of the
"Common Name" field. This is done a bit sloppy right
now and should probably be done a bit more according to
RFC 2253.
I've noticed that toString() seems to do a better job than
getName() on these X500Principal objects, so I'm hoping that
addresses Sebastian's concern.
For example, getName() gives me this:
1.2.840.113549.1.9.1=#16166a756c6975736461766965734063756362632e636f6d
whereas toString() gives me this:
[email protected]
Looks like toString() even works with non-ascii domain names!
I tested it with "花子.co.jp" and it worked fine.
*/
final String subjectPrincipal = cert.getSubjectX500Principal().toString();
final StringTokenizer st = new StringTokenizer(subjectPrincipal, ",+");
while (st.hasMoreTokens()) {
final String tok = st.nextToken().trim();
if (tok.length() > 3) {
if (tok.substring(0, 3).equalsIgnoreCase("CN=")) {
cnList.add(tok.substring(3));
}
}
}
if (!cnList.isEmpty()) {
final String[] cns = new String[cnList.size()];
cnList.toArray(cns);
return cns;
} else {
return null;
}
}
/**
* Extracts the array of SubjectAlt DNS or IP names from an X509Certificate.
* Returns null if there aren't any.
*
* @param cert X509Certificate
* @param hostname
* @return Array of SubjectALT DNS or IP names stored in the certificate.
*/
private static String[] getSubjectAlts(
final X509Certificate cert, final String hostname) {
final int subjectType;
if (isIPAddress(hostname)) {
subjectType = 7;
} else {
subjectType = 2;
}
final LinkedList subjectAltList = new LinkedList();
Collection> c = null;
try {
c = cert.getSubjectAlternativeNames();
} catch (final CertificateParsingException cpe) {
}
if (c != null) {
for (final List aC : c) {
final List list = aC;
final int type = ((Integer) list.get(0)).intValue();
if (type == subjectType) {
final String s = (String) list.get(1);
subjectAltList.add(s);
}
}
}
if (!subjectAltList.isEmpty()) {
final String[] subjectAlts = new String[subjectAltList.size()];
subjectAltList.toArray(subjectAlts);
return subjectAlts;
} else {
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) {
return getSubjectAlts(cert, 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;
}
private static boolean isIPAddress(final String hostname) {
return hostname != null &&
(InetAddressUtils.isIPv4Address(hostname) ||
InetAddressUtils.isIPv6Address(hostname));
}
/*
* Check if hostname is IPv6, and if so, convert to standard format.
*/
private String normaliseIPv6Address(final String hostname) {
if (hostname == null || !InetAddressUtils.isIPv6Address(hostname)) {
return hostname;
}
try {
final InetAddress inetAddress = InetAddress.getByName(hostname);
return inetAddress.getHostAddress();
} catch (final UnknownHostException uhe) { // Should not happen, because we check for IPv6 address above
log.error("Unexpected error converting " + hostname, uhe);
return hostname;
}
}
}
