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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.tomcat.util.net.jsse;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.util.ArrayList;
import java.util.List;
import javax.crypto.Cipher;
import javax.crypto.EncryptedPrivateKeyInfo;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import org.apache.tomcat.util.buf.Asn1Parser;
import org.apache.tomcat.util.codec.binary.Base64;
import org.apache.tomcat.util.file.ConfigFileLoader;
import org.apache.tomcat.util.res.StringManager;
/**
* RFC 1421 PEM file containing X509 certificates or private keys (PKCS#8 only,
* i.e. with boundaries containing "BEGIN PRIVATE KEY" or "BEGIN ENCRYPTED PRIVATE KEY",
* not "BEGIN RSA PRIVATE KEY" or other variations).
*/
public class PEMFile {
private static final StringManager sm = StringManager.getManager(PEMFile.class);
private String filename;
private List certificates = new ArrayList<>();
private PrivateKey privateKey;
public List getCertificates() {
return certificates;
}
public PrivateKey getPrivateKey() {
return privateKey;
}
public PEMFile(String filename) throws IOException, GeneralSecurityException {
this(filename, null);
}
public PEMFile(String filename, String password) throws IOException, GeneralSecurityException {
this(filename, password, null);
}
public PEMFile(String filename, String password, String keyAlgorithm)
throws IOException, GeneralSecurityException {
this.filename = filename;
List parts = new ArrayList<>();
try (InputStream inputStream = ConfigFileLoader.getSource().getResource(filename).getInputStream()) {
BufferedReader reader =
new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.US_ASCII));
Part part = null;
String line;
while ((line = reader.readLine()) != null) {
if (line.startsWith(Part.BEGIN_BOUNDARY)) {
part = new Part();
part.type = line.substring(Part.BEGIN_BOUNDARY.length(), line.length() - 5).trim();
} else if (line.startsWith(Part.END_BOUNDARY)) {
parts.add(part);
part = null;
} else if (part != null && !line.contains(":") && !line.startsWith(" ")) {
part.content += line;
}
}
}
for (Part part : parts) {
switch (part.type) {
case "PRIVATE KEY":
privateKey = part.toPrivateKey(null, keyAlgorithm, Format.PKCS8);
break;
case "ENCRYPTED PRIVATE KEY":
privateKey = part.toPrivateKey(password, keyAlgorithm, Format.PKCS8);
break;
case "RSA PRIVATE KEY":
privateKey = part.toPrivateKey(null, keyAlgorithm, Format.PKCS1);
break;
case "CERTIFICATE":
case "X509 CERTIFICATE":
certificates.add(part.toCertificate());
break;
}
}
}
private class Part {
public static final String BEGIN_BOUNDARY = "-----BEGIN ";
public static final String END_BOUNDARY = "-----END ";
public String type;
public String content = "";
private byte[] decode() {
return Base64.decodeBase64(content);
}
public X509Certificate toCertificate() throws CertificateException {
CertificateFactory factory = CertificateFactory.getInstance("X.509");
return (X509Certificate) factory.generateCertificate(new ByteArrayInputStream(decode()));
}
public PrivateKey toPrivateKey(String password, String keyAlgorithm, Format format)
throws GeneralSecurityException, IOException {
KeySpec keySpec = null;
if (password == null) {
switch (format) {
case PKCS1: {
keySpec = parsePKCS1(decode());
break;
}
case PKCS8: {
keySpec = new PKCS8EncodedKeySpec(decode());
break;
}
}
} else {
EncryptedPrivateKeyInfo privateKeyInfo = new EncryptedPrivateKeyInfo(decode());
SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance(privateKeyInfo.getAlgName());
SecretKey secretKey = secretKeyFactory.generateSecret(new PBEKeySpec(password.toCharArray()));
Cipher cipher = Cipher.getInstance(privateKeyInfo.getAlgName());
cipher.init(Cipher.DECRYPT_MODE, secretKey, privateKeyInfo.getAlgParameters());
keySpec = privateKeyInfo.getKeySpec(cipher);
}
InvalidKeyException exception = new InvalidKeyException(sm.getString("jsse.pemParseError", filename));
if (keyAlgorithm == null) {
for (String algorithm : new String[] {"RSA", "DSA", "EC"}) {
try {
return KeyFactory.getInstance(algorithm).generatePrivate(keySpec);
} catch (InvalidKeySpecException e) {
exception.addSuppressed(e);
}
}
} else {
try {
return KeyFactory.getInstance(keyAlgorithm).generatePrivate(keySpec);
} catch (InvalidKeySpecException e) {
exception.addSuppressed(e);
}
}
throw exception;
}
private RSAPrivateCrtKeySpec parsePKCS1(byte[] source) {
Asn1Parser p = new Asn1Parser(source);
// https://en.wikipedia.org/wiki/X.690#BER_encoding
// https://tools.ietf.org/html/rfc8017#page-55
// Type
p.parseTag(0x30);
// Length
p.parseFullLength();
BigInteger version = p.parseInt();
if (version.intValue() == 1) {
// JRE doesn't provide a suitable constructor for multi-prime
// keys
throw new IllegalArgumentException(sm.getString("pemFile.noMultiPrimes"));
}
return new RSAPrivateCrtKeySpec(p.parseInt(), p.parseInt(), p.parseInt(), p.parseInt(),
p.parseInt(), p.parseInt(), p.parseInt(), p.parseInt());
}
}
private enum Format {
PKCS1,
PKCS8
}
}
