由于某种原因,我们需要对jenkins存储的凭证进行解密.
我们需要使用三个文件,分别是
- secrets目录下的master.key
- secrets目录下的hudson.util.Secret
- home目录下的credentials.xml,这里存储了密文密码,如下
<com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl>
<scope>GLOBAL</scope>
<id>xxx</id>
<description>xxxx</description>
<username>xxx</username>
<password>密文密码</password>
</com.cloudbees.plugins.credentials.impl.UsernamePasswordCredentialsImpl>
其中,password 里的用{}包裹的就是我们要用的,把大括号一起复制到下面代码里
代码如下,使用了依赖
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
package com.xiuluo.test.jenkins;
import org.apache.commons.io.IOUtils;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Base64;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* 文件名称：Test<br>
* 初始作者：修罗大人<br>
* 创建日期：2020-04-21 14:28<br>
* 功能说明：<br>
* <br>
*/
public class Test {
private static final String KEY_ALGORITHM = "AES";
private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
private final String rootDir = "secrets文件夹路径";
private static final byte[] MAGIC = "::::MAGIC::::".getBytes();
// 密文密码
private static final String data = "密文密码";
@org.junit.Test
public void decrypt() {
byte[] payload;
try {
payload = Base64.getDecoder().decode(data.substring(1, data.length()-1));
} catch (IllegalArgumentException e) {
return;
}
switch (payload[0]) {
case 1:
// For PAYLOAD_V1 we use this byte shifting model, V2 probably will need DataOutput
int ivLength = ((payload[1] & 0xff) << 24)
| ((payload[2] & 0xff) << 16)
| ((payload[3] & 0xff) << 8)
| (payload[4] & 0xff);
int dataLength = ((payload[5] & 0xff) << 24)
| ((payload[6] & 0xff) << 16)
| ((payload[7] & 0xff) << 8)
| (payload[8] & 0xff);
if (payload.length != 1 + 8 + ivLength + dataLength) {
// not valid v1
return;
}
byte[] iv = Arrays.copyOfRange(payload, 9, 9 + ivLength);
byte[] code = Arrays.copyOfRange(payload, 9+ivLength, payload.length);
String text;
try {
text = new String(decrypt(iv).doFinal(code), UTF_8);
System.out.println("密码明文:" + text);
} catch (GeneralSecurityException e) {
// it's v1 which cannot be historical, but not decrypting
return;
}
// return new Secret(text, iv);
default:
return;
}
}
public Cipher decrypt(byte[] iv) {
try {
Cipher cipher = getCipher(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, getKey(), new IvParameterSpec(iv));
return cipher;
} catch (Exception e) {
throw new AssertionError(e);
}
}
private synchronized SecretKey getKey() throws Exception {
SecretKey secret = null;
try {
byte[] payload = load();
if (payload == null) {
payload = randomBytes(256);
// store(payload);
}
// Due to the stupid US export restriction JDK only ships 128bit version.
secret = new SecretKeySpec(payload, 0, 128 / 8, KEY_ALGORITHM);
} catch (IOException e) {
throw e;
}
return secret;
}
protected byte[] load() throws Exception {
try {
File f = new File(rootDir,"hudson.util.Secret");
if (!f.exists()) return null;
Cipher sym = getCipher("AES");
sym.init(Cipher.DECRYPT_MODE, getMasterKey());
try (InputStream fis= Files.newInputStream(f.toPath());
CipherInputStream cis = new CipherInputStream(fis, sym)) {
byte[] bytes = IOUtils.toByteArray(cis);
return verifyMagic(bytes);
}
} catch (Exception x) {
if (x.getCause() instanceof BadPaddingException) {
throw x; // broken somehow
} else {
throw x;
}
}
}
public static Cipher getCipher(String algorithm) throws GeneralSecurityException {
return Cipher.getInstance(algorithm);
}
private SecretKey getMasterKey() throws Exception {
File file = new File(rootDir,"master.key");
SecretKey masterKey = toAes128Key(read(file).trim());
return masterKey;
}
public String read(File file) throws Exception {
StringWriter out = new StringWriter();
PrintWriter w = new PrintWriter(out);
BufferedReader in = Files.newBufferedReader(file.toPath(), StandardCharsets.UTF_8);
String line;
while ((line = in.readLine()) != null)
w.println(line);
return out.toString();
}
public byte[] randomBytes(int size) {
byte[] random = new byte[size];
new SecureRandom().nextBytes(random);
return random;
}
private byte[] verifyMagic(byte[] payload) {
int payloadLen = payload.length-MAGIC.length;
if (payloadLen<0) return null; // obviously broken
for (int i=0; i<MAGIC.length; i++) {
if (payload[payloadLen+i]!=MAGIC[i])
return null; // broken
}
byte[] truncated = new byte[payloadLen];
System.arraycopy(payload,0,truncated,0,truncated.length);
return truncated;
}
public static String toHexString(byte[] bytes) {
int start = 0;
int len = bytes.length;
StringBuilder buf = new StringBuilder();
for( int i=0; i<len; i++ ) {
int b = bytes[start+i]&0xFF;
if(b<16) buf.append('0');
buf.append(Integer.toHexString(b));
}
return buf.toString();
}
public static SecretKey toAes128Key(String s) {
try {
// turn secretKey into 256 bit hash
MessageDigest digest = MessageDigest.getInstance("SHA-256");
digest.reset();
digest.update(s.getBytes(StandardCharsets.UTF_8));
// Due to the stupid US export restriction JDK only ships 128bit version.
return new SecretKeySpec(digest.digest(),0,128/8, "AES");
} catch (NoSuchAlgorithmException e) {
throw new Error(e);
}
}
}
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