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/*
* Copyright 2014 The Netty Project
*
* The Netty Project 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 org.glowroot.shaded.netty.handler.ssl;
import org.glowroot.shaded.netty.util.internal.NativeLibraryLoader;
import org.glowroot.shaded.netty.util.internal.logging.InternalLogger;
import org.glowroot.shaded.netty.util.internal.logging.InternalLoggerFactory;
import org.apache.tomcat.jni.Library;
import org.apache.tomcat.jni.Pool;
import org.apache.tomcat.jni.SSL;
import org.apache.tomcat.jni.SSLContext;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* Tells if {@code netty-tcnative} and its OpenSSL support
* are available.
*/
public final class OpenSsl {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(OpenSsl.class);
private static final Throwable UNAVAILABILITY_CAUSE;
private static final Set AVAILABLE_CIPHER_SUITES;
static {
Throwable cause = null;
// Test if netty-tcnative is in the classpath first.
try {
Class.forName("org.apache.tomcat.jni.SSL", false, OpenSsl.class.getClassLoader());
} catch (ClassNotFoundException t) {
cause = t;
logger.debug(
"netty-tcnative not in the classpath; " +
OpenSslEngine.class.getSimpleName() + " will be unavailable.");
}
// If in the classpath, try to load the native library and initialize netty-tcnative.
if (cause == null) {
try {
NativeLibraryLoader.load("netty-tcnative", SSL.class.getClassLoader());
Library.initialize("provided");
SSL.initialize(null);
} catch (Throwable t) {
cause = t;
logger.debug(
"Failed to load netty-tcnative; " +
OpenSslEngine.class.getSimpleName() + " will be unavailable. " +
"See http://netty.io/wiki/forked-tomcat-native.html for more information.", t);
}
}
UNAVAILABILITY_CAUSE = cause;
if (cause == null) {
final Set availableCipherSuites = new LinkedHashSet(128);
final long aprPool = Pool.create(0);
try {
final long sslCtx = SSLContext.make(aprPool, SSL.SSL_PROTOCOL_ALL, SSL.SSL_MODE_SERVER);
try {
SSLContext.setOptions(sslCtx, SSL.SSL_OP_ALL);
SSLContext.setCipherSuite(sslCtx, "ALL");
final long ssl = SSL.newSSL(sslCtx, true);
try {
for (String c: SSL.getCiphers(ssl)) {
// Filter out bad input.
if (c == null || c.length() == 0 || availableCipherSuites.contains(c)) {
continue;
}
availableCipherSuites.add(c);
}
} finally {
SSL.freeSSL(ssl);
}
} finally {
SSLContext.free(sslCtx);
}
} catch (Exception e) {
logger.warn("Failed to get the list of available OpenSSL cipher suites.", e);
} finally {
Pool.destroy(aprPool);
}
AVAILABLE_CIPHER_SUITES = Collections.unmodifiableSet(availableCipherSuites);
} else {
AVAILABLE_CIPHER_SUITES = Collections.emptySet();
}
}
/**
* Returns {@code true} if and only if
* {@code netty-tcnative} and its OpenSSL support
* are available.
*/
public static boolean isAvailable() {
return UNAVAILABILITY_CAUSE == null;
}
/**
* Returns {@code true} if the used version of openssl supports
* ALPN.
*/
public static boolean isAlpnSupported() {
return version() >= 0x10002000L;
}
/**
* Returns the version of the used available OpenSSL library or {@code -1} if {@link #isAvailable()}
* returns {@code false}.
*/
public static int version() {
if (isAvailable()) {
return SSL.version();
}
return -1;
}
/**
* Returns the version string of the used available OpenSSL library or {@code null} if {@link #isAvailable()}
* returns {@code false}.
*/
public static String versionString() {
if (isAvailable()) {
return SSL.versionString();
}
return null;
}
/**
* Ensure that {@code netty-tcnative} and
* its OpenSSL support are available.
*
* @throws UnsatisfiedLinkError if unavailable
*/
public static void ensureAvailability() {
if (UNAVAILABILITY_CAUSE != null) {
throw (Error) new UnsatisfiedLinkError(
"failed to load the required native library").initCause(UNAVAILABILITY_CAUSE);
}
}
/**
* Returns the cause of unavailability of
* {@code netty-tcnative} and its OpenSSL support.
*
* @return the cause if unavailable. {@code null} if available.
*/
public static Throwable unavailabilityCause() {
return UNAVAILABILITY_CAUSE;
}
/**
* Returns all the available OpenSSL cipher suites.
* Please note that the returned array may include the cipher suites that are insecure or non-functional.
*/
public static Set availableCipherSuites() {
return AVAILABLE_CIPHER_SUITES;
}
/**
* Returns {@code true} if and only if the specified cipher suite is available in OpenSSL.
* Both Java-style cipher suite and OpenSSL-style cipher suite are accepted.
*/
public static boolean isCipherSuiteAvailable(String cipherSuite) {
String converted = CipherSuiteConverter.toOpenSsl(cipherSuite);
if (converted != null) {
cipherSuite = converted;
}
return AVAILABLE_CIPHER_SUITES.contains(cipherSuite);
}
static boolean isError(long errorCode) {
return errorCode != SSL.SSL_ERROR_NONE;
}
private OpenSsl() { }
}