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/*
* Copyright (c) 2004, PostgreSQL Global Development Group
* See the LICENSE file in the project root for more information.
*/
package org.postgresql.ssl;
import org.postgresql.util.GT;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.UUID;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
/**
* Provides a SSLSocketFactory that authenticates the remote server against an explicit pre-shared
* SSL certificate. This is more secure than using the NonValidatingFactory as it prevents "man in
* the middle" attacks. It is also more secure than relying on a central CA signing your server's
* certificate as it pins the server's certificate.
*
* This class requires a single String parameter specified by setting the connection property
* sslfactoryarg. The value of this property is the PEM-encoded remote server's SSL
* certificate.
*
* Where the certificate is loaded from is based upon the prefix of the sslfactoryarg property.
* The following table lists the valid set of prefixes.
*
*
* Valid prefixes for sslfactoryarg
*
* Prefix
* Example
* Explanation
*
*
* classpath:classpath:ssl/server.crtLoaded from the classpath.
*
*
* file:file:/foo/bar/server.crtLoaded from the filesystem.
*
*
* env:env:mydb_certLoaded from string value of the mydb_cert environment variable.
*
*
* sys:sys:mydb_certLoaded from string value of the mydb_cert system property.
*
*
* -----BEGIN CERTIFICATE------
*
* -----BEGIN CERTIFICATE-----
* MIIDQzCCAqygAwIBAgIJAOd1tlfiGoEoMA0GCSqGSIb3DQEBBQUAMHUxCzAJBgNV
* [... truncated ...]
* UCmmYqgiVkAGWRETVo+byOSDZ4swb10=
* -----END CERTIFICATE-----
*
*
* Loaded from string value of the argument.
*
*
*/
public class SingleCertValidatingFactory extends WrappedFactory {
private static final String FILE_PREFIX = "file:";
private static final String CLASSPATH_PREFIX = "classpath:";
private static final String ENV_PREFIX = "env:";
private static final String SYS_PROP_PREFIX = "sys:";
public SingleCertValidatingFactory(String sslFactoryArg) throws GeneralSecurityException {
if (sslFactoryArg == null || sslFactoryArg.equals("")) {
throw new GeneralSecurityException(GT.tr("The sslfactoryarg property may not be empty."));
}
InputStream in = null;
try {
if (sslFactoryArg.startsWith(FILE_PREFIX)) {
String path = sslFactoryArg.substring(FILE_PREFIX.length());
in = new BufferedInputStream(new FileInputStream(path));
} else if (sslFactoryArg.startsWith(CLASSPATH_PREFIX)) {
String path = sslFactoryArg.substring(CLASSPATH_PREFIX.length());
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream inputStream;
if (classLoader != null) {
inputStream = classLoader.getResourceAsStream(path);
if (inputStream == null) {
throw new IllegalArgumentException(
GT.tr("Unable to find resource {0} via Thread contextClassLoader {1}",
path, classLoader)
);
}
} else {
inputStream = getClass().getResourceAsStream(path);
if (inputStream == null) {
throw new IllegalArgumentException(
GT.tr("Unable to find resource {0} via class {1} ClassLoader {2}",
path, getClass(), getClass().getClassLoader())
);
}
}
in = new BufferedInputStream(inputStream);
} else if (sslFactoryArg.startsWith(ENV_PREFIX)) {
String name = sslFactoryArg.substring(ENV_PREFIX.length());
String cert = System.getenv(name);
if (cert == null || "".equals(cert)) {
throw new GeneralSecurityException(GT.tr(
"The environment variable containing the server's SSL certificate must not be empty."));
}
in = new ByteArrayInputStream(cert.getBytes("UTF-8"));
} else if (sslFactoryArg.startsWith(SYS_PROP_PREFIX)) {
String name = sslFactoryArg.substring(SYS_PROP_PREFIX.length());
String cert = System.getProperty(name);
if (cert == null || "".equals(cert)) {
throw new GeneralSecurityException(GT.tr(
"The system property containing the server's SSL certificate must not be empty."));
}
in = new ByteArrayInputStream(cert.getBytes("UTF-8"));
} else if (sslFactoryArg.startsWith("-----BEGIN CERTIFICATE-----")) {
in = new ByteArrayInputStream(sslFactoryArg.getBytes("UTF-8"));
} else {
throw new GeneralSecurityException(GT.tr(
"The sslfactoryarg property must start with the prefix file:, classpath:, env:, sys:, or -----BEGIN CERTIFICATE-----."));
}
SSLContext ctx = SSLContext.getInstance("TLS");
ctx.init(null, new TrustManager[]{new SingleCertTrustManager(in)}, null);
factory = ctx.getSocketFactory();
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
if (e instanceof GeneralSecurityException) {
throw (GeneralSecurityException) e;
}
throw new GeneralSecurityException(GT.tr("An error occurred reading the certificate"), e);
} finally {
if (in != null) {
try {
in.close();
} catch (Exception e2) {
// ignore
}
}
}
}
public static class SingleCertTrustManager implements X509TrustManager {
X509Certificate cert;
X509TrustManager trustManager;
public SingleCertTrustManager(InputStream in) throws IOException, GeneralSecurityException {
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
// Note: KeyStore requires it be loaded even if you don't load anything into it:
ks.load(null);
CertificateFactory cf = CertificateFactory.getInstance("X509");
cert = (X509Certificate) cf.generateCertificate(in);
ks.setCertificateEntry(UUID.randomUUID().toString(), cert);
TrustManagerFactory tmf =
TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(ks);
for (TrustManager tm : tmf.getTrustManagers()) {
if (tm instanceof X509TrustManager) {
trustManager = (X509TrustManager) tm;
break;
}
}
if (trustManager == null) {
throw new GeneralSecurityException(GT.tr("No X509TrustManager found"));
}
}
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
trustManager.checkServerTrusted(chain, authType);
}
public X509Certificate[] getAcceptedIssuers() {
return new X509Certificate[]{cert};
}
}
}