用netty造一个简易的fiddler ( 一生成证书 )

2018-07-22 05:48:16来源：博客园阅读 ()

　　本人曾在上一家公司,搞过半年的爬虫.因此认识了这个叫 fiddler 的工具.当然市面上还有 charles ,开源也有 anyproxy whistle.到最后我还是喜欢用fiddler.似乎有点念旧.而现在这家公司是做erp的.项目用到了netty.

　　因此才有这个念头.造一个简单的轮子-简易的fiddler

　　Fiddler是一个http协议调试代理工具，它能够记录并检查所有你的电脑和互联网之间的http通讯，设置断点，查看所有的“进出”Fiddler的数据。摘自百度百科.

　　用过上面的工具都知道,捕获https请求都要安装证书的.本篇内容:生成证书

　网上很多都是使用openssl生成证书的.其实用java完全可以生成的.

<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcpkix-jdk15on</artifactId>
    <version>1.59</version>
</dependency>

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.6</version>
</dependency>

Security.addProvider(new BouncyCastleProvider());

KeyPairGenerator keyPairGenerator=KeyPairGenerator.getInstance("RSA", "BC");
keyPairGenerator.initialize(2048, new SecureRandom());
KeyPair keyPair = keyPairGenerator.genKeyPair();

X500NameBuilder builder = new X500NameBuilder(BCStyle.INSTANCE).addRDN(BCStyle.C, "C");
builder.addRDN(BCStyle.L, "L").addRDN(BCStyle.O, "O").addRDN(BCStyle.ST, "ST");
X500Name x500Name=builder.addRDN(BCStyle.OU, "OU").addRDN(BCStyle.CN, "CN").build();

Date notBefore = new Date(System.currentTimeMillis()); 
Date notAfter = new Date(System.currentTimeMillis() + 730 * 48 * 3600000L);//two year

X509v3CertificateBuilder xcBuilder = new JcaX509v3CertificateBuilder(
        x500Name, BigInteger.valueOf(1), notBefore, notAfter, x500Name, keyPair.getPublic());
xcBuilder.addExtension(Extension.basicConstraints, false, new BasicConstraints(true));
xcBuilder.addExtension(Extension.subjectKeyIdentifier, false, new JcaX509ExtensionUtils().createSubjectKeyIdentifier(keyPair.getPublic()));
xcBuilder.addExtension(Extension.authorityKeyIdentifier, false, new JcaX509ExtensionUtils().createAuthorityKeyIdentifier(keyPair.getPublic()));


ContentSigner signer = new JcaContentSignerBuilder("SHA256WithRSAEncryption").setProvider("BC").build(keyPair.getPrivate());
X509Certificate certificate = new JcaX509CertificateConverter().setProvider("BC").getCertificate(xcBuilder.build(signer));

String caPath="d:\\ca.crt";
String privateKeyPath="d:\\private.der";
saveX509Certificate(certificate.getEncoded(), caPath);
savePrivateKey(new File(privateKeyPath), keyPair.getPrivate(),null);

 public static void saveX509Certificate(byte[] content, String caPath) throws IOException, URISyntaxException {

        PemWriter pemWriter = null;
        try {
            pemWriter = new PemWriter(new OutputStreamWriter(new FileOutputStream(new File(caPath))));
            pemWriter.writeObject(new PemObject("CERTIFICATE", content));
        } finally {
            try {
                if (pemWriter != null) {
                    pemWriter.close();
                }
            } catch (IOException ignore) {

            }
        }

}

public static void savePrivateKey(File file, PrivateKey privateKey, OutputEncryptor encryptor) throws IOException {

    JcaPKCS8Generator jcaPKCS8Generator = new JcaPKCS8Generator(privateKey, encryptor);

    StringWriter stringWriter = new StringWriter();
    try (JcaPEMWriter pw = new JcaPEMWriter(stringWriter)) {
        pw.writeObject(jcaPKCS8Generator.generate());
    }

    FileUtils.writeByteArrayToFile(file, stringWriter.toString().getBytes());

}

　　运行上面代码都产生2个文件(ca.crt 是根证书 , private.der 是私钥).双击ca.crt,再点详细信息,就能看到下图右边那块了.下图是解释上面代码