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/*
* SonarQube
* Copyright (C) 2009-2019 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.api.config;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.SecureRandom;
import javax.annotation.Nullable;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.sonar.api.CoreProperties;
import static java.nio.charset.StandardCharsets.UTF_8;
final class AesCipher implements Cipher {
// Can't be increased because of Java 6 policy files :
// https://confluence.terena.org/display/~visser/No+256+bit+ciphers+for+Java+apps
// http://java.sun.com/javase/6/webnotes/install/jre/README
static final int KEY_SIZE_IN_BITS = 128;
private static final String CRYPTO_KEY = "AES";
private String pathToSecretKey;
AesCipher(@Nullable String pathToSecretKey) {
this.pathToSecretKey = pathToSecretKey;
}
@Override
public String encrypt(String clearText) {
try {
javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance(CRYPTO_KEY);
cipher.init(javax.crypto.Cipher.ENCRYPT_MODE, loadSecretFile());
return Base64.encodeBase64String(cipher.doFinal(clearText.getBytes(StandardCharsets.UTF_8.name())));
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
@Override
public String decrypt(String encryptedText) {
try {
javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance(CRYPTO_KEY);
cipher.init(javax.crypto.Cipher.DECRYPT_MODE, loadSecretFile());
byte[] cipherData = cipher.doFinal(Base64.decodeBase64(StringUtils.trim(encryptedText)));
return new String(cipherData, StandardCharsets.UTF_8);
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
/**
* This method checks the existence of the file, but not the validity of the contained key.
*/
boolean hasSecretKey() {
String path = getPathToSecretKey();
if (StringUtils.isNotBlank(path)) {
File file = new File(path);
return file.exists() && file.isFile();
}
return false;
}
private Key loadSecretFile() throws IOException {
String path = getPathToSecretKey();
return loadSecretFileFromFile(path);
}
Key loadSecretFileFromFile(@Nullable String path) throws IOException {
if (StringUtils.isBlank(path)) {
throw new IllegalStateException("Secret key not found. Please set the property " + CoreProperties.ENCRYPTION_SECRET_KEY_PATH);
}
File file = new File(path);
if (!file.exists() || !file.isFile()) {
throw new IllegalStateException("The property " + CoreProperties.ENCRYPTION_SECRET_KEY_PATH + " does not link to a valid file: " + path);
}
String s = FileUtils.readFileToString(file, UTF_8);
if (StringUtils.isBlank(s)) {
throw new IllegalStateException("No secret key in the file: " + path);
}
return new SecretKeySpec(Base64.decodeBase64(StringUtils.trim(s)), CRYPTO_KEY);
}
String generateRandomSecretKey() {
try {
KeyGenerator keyGen = KeyGenerator.getInstance(CRYPTO_KEY);
keyGen.init(KEY_SIZE_IN_BITS, new SecureRandom());
SecretKey secretKey = keyGen.generateKey();
return Base64.encodeBase64String(secretKey.getEncoded());
} catch (Exception e) {
throw new IllegalStateException("Fail to generate secret key", e);
}
}
String getPathToSecretKey() {
if (StringUtils.isBlank(pathToSecretKey)) {
pathToSecretKey = new File(FileUtils.getUserDirectoryPath(), ".sonar/sonar-secret.txt").getPath();
}
return pathToSecretKey;
}
public void setPathToSecretKey(@Nullable String pathToSecretKey) {
this.pathToSecretKey = pathToSecretKey;
}
}
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