/*
* Copyright 2016 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 io.netty.handler.ssl;
import java.security.PrivateKey;
import javax.security.auth.Destroyable;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.Unpooled;
import io.netty.util.AbstractReferenceCounted;
import io.netty.util.CharsetUtil;
import io.netty.util.IllegalReferenceCountException;
import io.netty.util.internal.ObjectUtil;
/**
* This is a special purpose implementation of a {@link PrivateKey} which allows the
* user to pass PEM/PKCS#8 encoded key material straight into {@link OpenSslContext}
* without having to parse and re-encode bytes in Java land.
*
* All methods other than what's implemented in {@link PemEncoded} and {@link Destroyable}
* throw {@link UnsupportedOperationException}s.
*
* @see PemEncoded
* @see OpenSslContext
* @see #valueOf(byte[])
* @see #valueOf(ByteBuf)
*/
public final class PemPrivateKey extends AbstractReferenceCounted implements PrivateKey, PemEncoded {
private static final byte[] BEGIN_PRIVATE_KEY = "-----BEGIN PRIVATE KEY-----\n".getBytes(CharsetUtil.US_ASCII);
private static final byte[] END_PRIVATE_KEY = "\n-----END PRIVATE KEY-----\n".getBytes(CharsetUtil.US_ASCII);
private static final String PKCS8_FORMAT = "PKCS#8";
/**
* Creates a {@link PemEncoded} value from the {@link PrivateKey}.
*/
static PemEncoded toPEM(ByteBufAllocator allocator, boolean useDirect, PrivateKey key) {
// We can take a shortcut if the private key happens to be already
// PEM/PKCS#8 encoded. This is the ideal case and reason why all
// this exists. It allows the user to pass pre-encoded bytes straight
// into OpenSSL without having to do any of the extra work.
if (key instanceof PemEncoded) {
return ((PemEncoded) key).retain();
}
ByteBuf encoded = Unpooled.wrappedBuffer(key.getEncoded());
try {
ByteBuf base64 = SslUtils.toBase64(allocator, encoded);
try {
int size = BEGIN_PRIVATE_KEY.length + base64.readableBytes() + END_PRIVATE_KEY.length;
boolean success = false;
final ByteBuf pem = useDirect ? allocator.directBuffer(size) : allocator.buffer(size);
try {
pem.writeBytes(BEGIN_PRIVATE_KEY);
pem.writeBytes(base64);
pem.writeBytes(END_PRIVATE_KEY);
PemValue value = new PemValue(pem, true);
success = true;
return value;
} finally {
// Make sure we never leak that PEM ByteBuf if there's an Exception.
if (!success) {
SslUtils.zerooutAndRelease(pem);
}
}
} finally {
SslUtils.zerooutAndRelease(base64);
}
} finally {
SslUtils.zerooutAndRelease(encoded);
}
}
/**
* Creates a {@link PemPrivateKey} from raw {@code byte[]}.
*
* ATTENTION: It's assumed that the given argument is a PEM/PKCS#8 encoded value.
* No input validation is performed to validate it.
*/
public static PemPrivateKey valueOf(byte[] key) {
return valueOf(Unpooled.wrappedBuffer(key));
}
/**
* Creates a {@link PemPrivateKey} from raw {@code ByteBuf}.
*
* ATTENTION: It's assumed that the given argument is a PEM/PKCS#8 encoded value.
* No input validation is performed to validate it.
*/
public static PemPrivateKey valueOf(ByteBuf key) {
return new PemPrivateKey(key);
}
private final ByteBuf content;
private PemPrivateKey(ByteBuf content) {
this.content = ObjectUtil.checkNotNull(content, "content");
}
@Override
public boolean isSensitive() {
return true;
}
@Override
public ByteBuf content() {
int count = refCnt();
if (count <= 0) {
throw new IllegalReferenceCountException(count);
}
return content;
}
@Override
public PemPrivateKey copy() {
return replace(content.copy());
}
@Override
public PemPrivateKey duplicate() {
return replace(content.duplicate());
}
@Override
public PemPrivateKey retainedDuplicate() {
return replace(content.retainedDuplicate());
}
@Override
public PemPrivateKey replace(ByteBuf content) {
return new PemPrivateKey(content);
}
@Override
public PemPrivateKey touch() {
content.touch();
return this;
}
@Override
public PemPrivateKey touch(Object hint) {
content.touch(hint);
return this;
}
@Override
public PemPrivateKey retain() {
return (PemPrivateKey) super.retain();
}
@Override
public PemPrivateKey retain(int increment) {
return (PemPrivateKey) super.retain(increment);
}
@Override
protected void deallocate() {
// Private Keys are sensitive. We need to zero the bytes
// before we're releasing the underlying ByteBuf
SslUtils.zerooutAndRelease(content);
}
@Override
public byte[] getEncoded() {
throw new UnsupportedOperationException();
}
@Override
public String getAlgorithm() {
throw new UnsupportedOperationException();
}
@Override
public String getFormat() {
return PKCS8_FORMAT;
}
/**
* NOTE: This is a JDK8 interface/method. Due to backwards compatibility
* reasons it's not possible to slap the {@code @Override} annotation onto
* this method.
*
* @see Destroyable#destroy()
*/
public void destroy() {
release(refCnt());
}
/**
* NOTE: This is a JDK8 interface/method. Due to backwards compatibility
* reasons it's not possible to slap the {@code @Override} annotation onto
* this method.
*
* @see Destroyable#isDestroyed()
*/
public boolean isDestroyed() {
return refCnt() == 0;
}
}