Exemplo n.º 1
0
 /**
  * Certificate Generation engine
  *
  * @param subject Certificate subject (e.g C=US,O=Grid,OU=OGSA,CN=John Doe)
  * @throws Exception if an error occurs
  */
 public CertGenerator(String subject) throws Exception {
   _subject = makeCertDN(subject);
   _strength = Integer.parseInt(GSIProperties.getString(GSIProperties.CERT_STRENGTH));
   logger.debug("Constructor Subject:" + subject);
 }
Exemplo n.º 2
0
/**
 * A class to automate the Globus Proxy creation and certificate installation. Emulates:
 * grid-proxy-init, install-certs, etc... Usage:
 *
 * <pre>
 * 			// proxy creation...
 * 		CertGenerator generator = new CertGenerator("Vladimir SIlva","IBMGrid");
 * 		generator.generateCertAndKey("2p2dkdt");
 *
 * 		GlobusCredential cred = generator.gridProxyInit("2p2dkdt", 512, 12);
 * 		System.out.println(cred.toString());
 *
 * 		// save creds...
 * 		generator.saveCertificates("c:\\temp\\usercert.pem", "c:\\temp\\userkey.pem");
 * 		generator.saveProxy(cred, "c:\\temp\\proxy.pem");
 * 		</pre>
 */
public class CertGenerator {
  static Logger logger = Logger.getLogger(CertGenerator.class);

  private String _certPEM = null;
  private String _keyPEM = null;
  private String _certRQPEM = null;

  /* Cert gen subject */
  X509Name _subject = null;

  private int _strength = 1024;
  private ResourceBundle _resBundle = GSIProperties.getResBundle();

  /**
   * Certificate Generation engine
   *
   * @param subject Certificate subject (e.g C=US,O=Grid,OU=OGSA,CN=John Doe)
   * @throws Exception if an error occurs
   */
  public CertGenerator(String subject) throws Exception {
    _subject = makeCertDN(subject);
    _strength = Integer.parseInt(GSIProperties.getString(GSIProperties.CERT_STRENGTH));
    logger.debug("Constructor Subject:" + subject);
  }
  /**
   * Certificate Generation engine
   *
   * @param subject subject Certificate subject (e.g C=US,O=Grid,OU=OGSA,CN=John Doe)
   * @param strength engine stren (e.g 1024)
   * @throws Exception
   */
  public CertGenerator(String subject, int strength) throws Exception {
    _subject = makeCertDN(subject);
    _strength = strength;
    logger.debug("Constructor Subject:" + subject + " stren=" + strength);
  }

  /**
   * generateCertAndKey Creates a Signed User certificate and a private key by generating a self
   * signed user certificate. Private key is encrypted w/ Pwd Certificates are kept internally. (CN
   * and OU are given to the contructor)
   *
   * @param Pwd = Challenge pwd (used to encrypt pirv key)
   * @throws FileNotFoundException
   * @throws IOException
   */
  public void generateSelfSignedCertAndKey(String Pwd) throws NoSuchAlgorithmException, Exception {
    if (_subject == null)
      throw new Exception(_resBundle.getString(GSIProperties.MSG_DN_INFO_REQUIRED));

    if (Pwd == null) throw new Exception(_resBundle.getString(GSIProperties.MSG_INVALID_PWD));

    logger.debug(
        "generateSelfSignedCertAndKey Cert subject: "
            + _subject.getNameString()
            + " Strength="
            + _strength
            + " Pwd="
            + Pwd);

    // Generate A Cert RQ
    StringWriter sw = new StringWriter(); // wil contain the priv key PEM
    BufferedWriter bw = new BufferedWriter(sw);

    KeyPair kp = CertRequest.generateKey("RSA", _strength, Pwd, bw, true); // gen pub/priv keys

    // certs are valid for 1 year: 31536000 secs
    byte[] certBytes = CertRequest.makeSelfSignedCert(kp, _subject, 31536000);

    // Private key
    _keyPEM = sw.toString();
    logger.debug("CertKeyGenerator: Private key PEM\n" + _keyPEM);

    // cert in PEM format
    // _certPEM = "Certificate:\n" +
    //		(CertUtil.loadCertificate(new ByteArrayInputStream(certBytes))).toString() + "\n" +
    _certPEM = writePEM(certBytes, "-----BEGIN CERTIFICATE-----\n", "-----END CERTIFICATE-----\n");

    logger.debug("CertKeyGenerator: Signed Cert RQ . signedUserCert\n" + _certPEM);
  }

  /**
   * createCertRequest: Create a certificate request PEM encoded string
   *
   * @param bits Certificate strenght in bits (e.g 512)
   * @param Pwd passphrase used to encrypt the private key
   * @return PEM encoded cert rq string
   * @throws IOException
   * @throws NoSuchProviderException
   * @throws NoSuchAlgorithmException
   */
  public synchronized void createCertRequest(int bits, String Pwd)
      throws IOException, NoSuchProviderException, NoSuchAlgorithmException,
          GeneralSecurityException {
    // Pwd cannot be null
    if (Pwd == null) throw new GeneralSecurityException("Invalid NULL password");

    /*
     * Generate A Cert RQ. Using the CertRequest utility class
     * implemented in puretls.jar
     */
    logger.debug(
        "createCertRequest: Creating a cert request Subject:"
            + _subject.getNameString()
            + " bits="
            + bits
            + " pwd="
            + Pwd);

    StringWriter sw = new StringWriter(); // wil contain the priv key PEM
    BufferedWriter bw = new BufferedWriter(sw);

    /*
     * Generate public/private keys
     */
    KeyPair kp = CertRequest.generateKey("RSA", bits, Pwd, bw, true);
    byte[] req = CertRequest.makePKCS10Request(kp, _subject);

    /*
     * Save data in PEM format
     */
    _certRQPEM =
        buildRequestInfoHeader(_subject.getNameString())
            + writePEM(
                req,
                "-----BEGIN CERTIFICATE REQUEST-----\n",
                "-----END CERTIFICATE REQUEST-----\n");

    _keyPEM = sw.toString();

    logger.debug("createCertRequest: Cert RQ\n" + _certRQPEM + "Key\n" + _keyPEM);
  }

  /* Cert RQ info header */
  private String buildRequestInfoHeader(String subject) {
    StringBuffer buff =
        new StringBuffer(
            "This is a Certificate Request file:\nIt should be mailed to to a CA for signature");
    buff.append("\n===============================================================");
    buff.append("\nCertificate Subject:\n\t");
    buff.append(subject);
    buff.append("\n\n");
    return buff.toString();
  }

  /** Write certficate bytes into a PEM encoded string */
  public static String writePEM(byte[] bytes, String hdr, String ftr) throws IOException {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    Base64OutputStream b64os = new Base64OutputStream(bos);
    b64os.write(bytes);
    b64os.flush();
    b64os.close();

    ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
    InputStreamReader irr = new InputStreamReader(bis);
    BufferedReader r = new BufferedReader(irr);

    StringBuffer buff = new StringBuffer();
    String line;
    buff.append(hdr);

    while ((line = r.readLine()) != null) {
      buff.append(line + "\n");
    }
    buff.append(ftr);
    return buff.toString();
  }

  /*
   * makeCertDN: Creates an X509 Identity based on a string subject
   * e.g:  "C=US,O=Grid,OU=OGSA,OU=Foo,CN=John Doe"
   */
  private static X509Name makeCertDN(String subject) throws Exception {
    Vector tdn = new Vector();
    //		Vector elems = new Vector();
    StringTokenizer st = new StringTokenizer(subject, ",");

    for (; st.hasMoreTokens(); ) {
      String s = st.nextToken(); // [key=value]
      if (s.indexOf("=") == -1)
        throw new Exception("Invalid subject format: " + subject + " Offending value: " + s);

      String key = s.substring(0, s.indexOf("=")).trim();
      String val = s.substring(s.indexOf("=") + 1).trim();

      if (val == null || val.equals(""))
        throw new Exception("Invalid subject format: " + subject + " Offending value: " + s);

      // logger.debug(key + "=" + val);
      String[] temp = {key, val};
      tdn.addElement(temp);
    }
    // COM.claymoresystems.cert (puretls.jar)
    return CertRequest.makeSimpleDN(tdn);
  }

  /**
   * Creates an X509 version3 certificate
   *
   * @param algorithm (e.g RSA, DSA, etc...)
   * @param bits Cet strength e.g 1024
   * @param issuer Issuer string e.g "O=Grid,OU=OGSA,CN=ACME"
   * @param subject Subject string e.g "O=Grid,OU=OGSA,CN=John Doe"
   * @param months time to live
   * @param outPrivKey OutputStream to the private key in PKCS#8 format (Note: this key will not be
   *     encrypted)
   * @return X509 V3 Certificate
   * @throws GeneralSecurityException
   */
  public static X509Certificate createX509Cert(
      String algorithm,
      int bits,
      String issuer,
      String subject,
      int months,
      OutputStream outPrivKey,
      String sigAlg,
      String pwd)
      throws GeneralSecurityException, IOException {
    // String sigAlg = "SHA1WithRSAEncryption";

    // Priv key is in PKCS#8 format
    KeyPair kp = CertUtil.generateKeyPair(algorithm, bits);

    // must convert from PKCS#8 to PKCS#1 to encrypt with BouncyCastleOpenSSLKey
    // Priv key must be DER encoded key data in PKCS#1 format to be encrypted.
    OpenSSLKey PKCS_8key = new BouncyCastleOpenSSLKey(kp.getPrivate());

    long serial = 0;

    logger.debug(
        "createX509Cert Alg: "
            + algorithm
            + " bits:"
            + bits
            + " Issuer: "
            + issuer
            + " Subject: "
            + subject);
    logger.debug(
        "createX509Cert Sig alg:"
            + sigAlg
            + " Priv key format:"
            + PKCS_8key.getPrivateKey().getFormat());

    // if ( pwd != null && ! PKCS_8key.isEncrypted())
    //	PKCS_8key.encrypt(pwd);

    // write private key
    PKCS_8key.writeTo(outPrivKey);

    // return X509 Cert
    return createX509V3Certificate(
        kp.getPublic(), kp.getPrivate(), months, issuer, subject, serial, sigAlg);
  }

  /* Cert creation engine */
  private static synchronized X509Certificate createX509V3Certificate(
      PublicKey pubKey,
      PrivateKey privKey,
      int ttlMonths,
      String issuerDN,
      String subjectDN,
      long serial,
      String signAlgoritm)
      throws GeneralSecurityException {
    X509V3CertificateGenerator certGenerator = new X509V3CertificateGenerator();
    certGenerator.reset();

    certGenerator.setSerialNumber(java.math.BigInteger.valueOf(serial));
    certGenerator.setIssuerDN(new org.bouncycastle.asn1.x509.X509Name(issuerDN));
    certGenerator.setNotBefore(new java.util.Date(System.currentTimeMillis()));
    certGenerator.setNotAfter(
        new java.util.Date(System.currentTimeMillis() + ttlMonths * (1000L * 60 * 60 * 24 * 30)));
    certGenerator.setSubjectDN(new org.bouncycastle.asn1.x509.X509Name(subjectDN));
    certGenerator.setPublicKey(pubKey);
    certGenerator.setSignatureAlgorithm(signAlgoritm);

    X509Certificate cert =
        certGenerator.generateX509Certificate(privKey, "BC", new java.security.SecureRandom());
    cert.checkValidity(new java.util.Date());
    cert.verify(pubKey);

    return cert;
  }

  /**
   * readPEM: Read a PEM encoded base64 stream and decode it
   *
   * @param is Base64 PEM encoded stream
   * @param hdr Header delimeter (e.g. ----------CERTIFICATE---------)
   * @param ftr Footer delimeter (e.g. ----------END CERTIFICATE---------)
   * @return decoded DER bytes
   * @throws IOException if a read error occurs
   */
  public static byte[] readPEM(InputStream is, String hdr, String ftr) throws IOException {
    logger.debug("Reading PEM hdr:" + hdr + " ftr:" + ftr);
    is.reset();
    InputStreamReader irr = new InputStreamReader(is);
    BufferedReader r = new BufferedReader(irr);

    StringBuffer buff = new StringBuffer();
    String line;
    boolean read = false;

    while ((line = r.readLine()) != null) {
      if (line.equals(hdr)) {
        read = true;
        continue;
      }
      if (line.equals(ftr)) read = false;
      if (read) buff.append(line);
    }
    return Base64.decode(buff.toString().getBytes());
  }

  /**
   * Test if a X509 key is encryped
   *
   * @param inKey X509 key stream
   * @return true if encrypted e;se flase
   * @throws IOException
   * @throws GeneralSecurityException
   */
  public static boolean isKeyEncrypted(InputStream inKey)
      throws IOException, GeneralSecurityException {
    return (new BouncyCastleOpenSSLKey(inKey)).isEncrypted();
  }

  /* getter methods */
  public String getCertPEM() {
    return _certPEM;
  }

  public String getKeyPEM() {
    return _keyPEM;
  }

  public String getCertRQPEM() {
    return _certRQPEM;
  }

  public X509Name getSubject() {
    return _subject;
  }

  /* setter(mutator) mthods */
  public void setCertPEM(String certPEM) {
    _certPEM = certPEM;
  }

  public void setKeyPEM(String keyPEM) {
    _keyPEM = keyPEM;
  }

  public String toString() {
    return "\nCert Request:\n" + _certRQPEM + "\nCertificate:\n" + _certPEM + "\nKey:\n" + _keyPEM;
  }
}