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An example program using AsyncHttpClient with SSL certificate verification
MyDownloader
============
An example program using AsyncHttpClient with SSL certificate verification.
Prerequisites
-------------
* Apache Ant - http://ant.apache.org/
* Apache Ivy - http://ant.apache.org/ivy/
Build/Run
---------
To (optionally) build this program:
ant compile
To run the program:
ant run -Durl=<url>
<project name="mydownloader-java" default="run"
xmlns:ivy="antlib:org.apache.ivy.ant">
<property name="build" value="build" />
<target name="compile">
<mkdir dir="${build}" />
<ivy:resolve />
<ivy:cachepath pathid="classpath.ivy" />
<javac srcdir="." destdir="${build}" includeAntRuntime="false">
<filename name="MyDownloader.java" />
<classpath>
<path refid="classpath.ivy" />
</classpath>
</javac>
</target>
<target name="run" depends="compile">
<java classname="MyDownloader">
<arg value="${url}" />
<classpath>
<pathelement path="${build}" />
<path refid="classpath.ivy" />
</classpath>
</java>
</target>
<target name="clean">
<delete dir="${build}" />
</target>
<target name="main" depends="run" />
</project>
<ivy-module version="2.0">
<info organisation="name.kevinlocke" module="mydownloader-java"/>
<dependencies>
<dependency org="com.ning" name="async-http-client" rev="latest.release" />
</dependencies>
</ivy-module>
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/* An example program using AsyncHttpClient with SSL certificate verification
*
* To the extent possible under law, Kevin Locke has waived all copyright and
* related or neighboring rights to this work.
* A legal description of this waiver is available in LICENSE.txt.
*/
import com.ning.http.client.AsyncHttpClient;
import com.ning.http.client.AsyncHttpClientConfig;
import com.ning.http.client.Response;
import java.io.IOException;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.Principal;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.concurrent.ExecutionException;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLPeerUnverifiedException;
import javax.net.ssl.SSLSession;
import javax.security.auth.kerberos.KerberosPrincipal;
import sun.security.util.HostnameChecker;
/** Implements the "MyDownloader" application */
public class MyDownloader {
/** HostnameVerifier implementation which implements the same policy as the
* Java built-in pre-HostnameVerifier policy.
*/
private static class MyHostnameVerifier implements HostnameVerifier {
/** Checks if a given hostname matches the certificate or principal of
* a given session.
*/
private boolean hostnameMatches(String hostname, SSLSession session) {
HostnameChecker checker =
HostnameChecker.getInstance(HostnameChecker.TYPE_TLS);
boolean validCertificate = false, validPrincipal = false;
try {
Certificate[] peerCertificates = session.getPeerCertificates();
if (peerCertificates.length > 0 &&
peerCertificates[0] instanceof X509Certificate) {
X509Certificate peerCertificate =
(X509Certificate)peerCertificates[0];
try {
checker.match(hostname, peerCertificate);
// Certificate matches hostname
validCertificate = true;
} catch (CertificateException ex) {
// Certificate does not match hostname
}
} else {
// Peer does not have any certificates or they aren't X.509
}
} catch (SSLPeerUnverifiedException ex) {
// Not using certificates for peers, try verifying the principal
try {
Principal peerPrincipal = session.getPeerPrincipal();
if (peerPrincipal instanceof KerberosPrincipal) {
validPrincipal = HostnameChecker.match(hostname,
(KerberosPrincipal)peerPrincipal);
} else {
// Can't verify principal, not Kerberos
}
} catch (SSLPeerUnverifiedException ex2) {
// Can't verify principal, no principal
}
}
return validCertificate || validPrincipal;
}
public boolean verify(String hostname, SSLSession session) {
if (hostnameMatches(hostname, session)) {
return true;
} else {
// TODO: Add application-specific checks for
// hostname/certificate match
return false;
}
}
}
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage: myhttp <URL>");
} else {
String url = args[0];
SSLContext context = null;
try {
context = SSLContext.getInstance("TLS");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return;
}
try {
context.init(null, null, null);
} catch (KeyManagementException e) {
e.printStackTrace();
return;
}
AsyncHttpClient client = new AsyncHttpClient(
new AsyncHttpClientConfig.Builder()
.setSSLContext(context)
.setHostnameVerifier(new MyHostnameVerifier())
.build()
);
Response response = null;
try {
response = client.prepareGet(url).execute().get();
} catch (InterruptedException e) {
e.printStackTrace();
return;
} catch (ExecutionException e) {
e.printStackTrace();
return;
} catch (IOException e) {
e.printStackTrace();
return;
}
if (response.getStatusCode() / 100 == 2) {
try {
String responseBody = response.getResponseBody();
System.err.println("Successfully downloaded " + url);
System.out.println(responseBody);
} catch (IOException e) {
e.printStackTrace();
return;
}
} else {
System.err.println("Failure downloading " + url +
": HTTP Status " + response.getStatusCode());
}
}
}
}
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