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Microsoft JDBC Driver for SQL Server.
/*
* Microsoft JDBC Driver for SQL Server Copyright(c) Microsoft Corporation All rights reserved. This program is made
* available under the terms of the MIT License. See the LICENSE file in the project root for more information.
*/
package com.microsoft.sqlserver.jdbc;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.math.BigInteger;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.GeneralSecurityException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.UnrecoverableKeyException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.text.MessageFormat;
import java.util.Arrays;
import java.util.Base64;
import java.util.Collection;
import java.util.List;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import javax.net.ssl.KeyManager;
import javax.net.ssl.KeyManagerFactory;
import org.bouncycastle.openssl.PEMDecryptorProvider;
import org.bouncycastle.openssl.PEMEncryptedKeyPair;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
import org.bouncycastle.openssl.jcajce.JcePEMDecryptorProviderBuilder;
final class SQLServerCertificateUtils {
private static final Logger logger = Logger.getLogger("com.microsoft.sqlserver.jdbc.SQLServerCertificateUtils");
private static final String logContext = Thread.currentThread().getStackTrace()[1].getClassName() + ": ";
private SQLServerCertificateUtils() {
throw new UnsupportedOperationException(SQLServerException.getErrString("R_notSupported"));
}
static KeyManager[] getKeyManagerFromFile(String certPath, String keyPath,
String keyPassword) throws IOException, GeneralSecurityException, SQLServerException {
if (keyPath != null && keyPath.length() > 0) {
return readPKCS8Certificate(certPath, keyPath, keyPassword);
} else {
return readPKCS12Certificate(certPath, keyPassword);
}
}
/**
* Parse name in RFC 2253 format Returns the common name if successful, null if failed to find the common name. The
* parser tuned to be safe than sorry so if it sees something it can't parse correctly it returns null
*
* @param distinguishedName
* server name to parse
* @return subject name
*/
static String parseCommonName(String distinguishedName) {
int index;
// canonical name converts entire name to lowercase
index = distinguishedName.indexOf("cn=");
if (index == -1) {
return null;
}
distinguishedName = distinguishedName.substring(index + 3);
// Parse until a comma or end is reached
// Note the parser will handle gracefully (essentially will return empty string) , inside the quotes (e.g
// cn="Foo, bar") however
// RFC 952 says that the hostName cant have commas however the parser should not (and will not) crash if it
// sees a , within quotes.
for (index = 0; index < distinguishedName.length(); index++) {
if (distinguishedName.charAt(index) == ',') {
break;
}
}
String commonName = distinguishedName.substring(0, index);
// strip any quotes
if (commonName.length() > 1 && ('\"' == commonName.charAt(0))) {
if ('\"' == commonName.charAt(commonName.length() - 1))
commonName = commonName.substring(1, commonName.length() - 1);
else {
// Be safe the name is not ended in " return null so the common Name wont match
commonName = null;
}
}
return commonName;
}
/**
* Validate server name in certificate matches hostname
*
* @param nameInCert
* server name in certificate
* @param hostName
* hostname
* @return if the server name is valid and matches hostname
*/
static boolean validateServerName(String nameInCert, String hostName) {
// Failed to get the common name from DN or empty CN
if (null == nameInCert) {
if (logger.isLoggable(Level.FINER)) {
logger.finer(logContext + " Failed to parse the name from the certificate or name is empty.");
}
return false;
}
// We do not allow wildcards in IDNs (xn--).
if (!nameInCert.startsWith("xn--") && nameInCert.contains("*")) {
int hostIndex = 0, certIndex = 0, match = 0, startIndex = -1, periodCount = 0;
while (hostIndex < hostName.length()) {
if ('.' == hostName.charAt(hostIndex)) {
periodCount++;
}
if (certIndex < nameInCert.length() && hostName.charAt(hostIndex) == nameInCert.charAt(certIndex)) {
hostIndex++;
certIndex++;
} else if (certIndex < nameInCert.length() && '*' == nameInCert.charAt(certIndex)) {
startIndex = certIndex;
match = hostIndex;
certIndex++;
} else if (startIndex != -1 && 0 == periodCount) {
certIndex = startIndex + 1;
match++;
hostIndex = match;
} else {
logFailMessage(nameInCert, hostName);
return false;
}
}
if (nameInCert.length() == certIndex && periodCount > 1) {
logSuccessMessage(nameInCert, hostName);
return true;
} else {
logFailMessage(nameInCert, hostName);
return false;
}
}
// Verify that the name in certificate matches exactly with the host name
if (!nameInCert.equals(hostName)) {
logFailMessage(nameInCert, hostName);
return false;
}
logSuccessMessage(nameInCert, hostName);
return true;
}
/**
* Validate server name in certificate
*
* @param cert
* X509 certificate
* @param hostName
* hostname
* @throws CertificateException
*/
static void validateServerNameInCertificate(X509Certificate cert, String hostName) throws CertificateException {
String nameInCertDN = cert.getSubjectX500Principal().getName("canonical");
if (logger.isLoggable(Level.FINER)) {
logger.finer(logContext + " Validating the server name:" + hostName);
logger.finer(logContext + " The DN name in certificate:" + nameInCertDN);
}
boolean isServerNameValidated;
String dnsNameInSANCert = "";
// the name in cert is in RFC2253 format parse it to get the actual subject name
String subjectCN = parseCommonName(nameInCertDN);
isServerNameValidated = validateServerName(subjectCN, hostName);
if (!isServerNameValidated) {
Collection> sanCollection = cert.getSubjectAlternativeNames();
if (sanCollection != null) {
// find a subjectAlternateName entry corresponding to DNS Name
for (List sanEntry : sanCollection) {
if (sanEntry != null && sanEntry.size() >= 2) {
Object key = sanEntry.get(0);
Object value = sanEntry.get(1);
if (logger.isLoggable(Level.FINER)) {
logger.finer(logContext + "Key: " + key + "; KeyClass:"
+ (key != null ? key.getClass() : null) + ";value: " + value + "; valueClass:"
+ (value != null ? value.getClass() : null));
}
// From
// Documentation(http://download.oracle.com/javase/6/docs/api/java/security/cert/X509Certificate.html):
// "Note that the Collection returned may contain
// more than one name of the same type."
// So, more than one entry of dnsNameType can be present.
// Java docs guarantee that the first entry in the list will be an integer.
// 2 is the sequence no of a dnsName
if ((key != null) && (key instanceof Integer) && ((Integer) key == 2)) {
// As per RFC2459, the DNSName will be in the
// "preferred name syntax" as specified by RFC
// 1034 and the name can be in upper or lower case.
// And no significance is attached to case.
// Java docs guarantee that the second entry in the list
// will be a string for dnsName
if (value != null && value instanceof String) {
dnsNameInSANCert = (String) value;
// Use English locale to avoid Turkish i issues.
// Note that, this conversion was not necessary for
// cert.getSubjectX500Principal().getName("canonical");
// as the above API already does this by default as per documentation.
dnsNameInSANCert = dnsNameInSANCert.toLowerCase(Locale.ENGLISH);
isServerNameValidated = validateServerName(dnsNameInSANCert, hostName);
if (isServerNameValidated) {
if (logger.isLoggable(Level.FINER)) {
logger.finer(
logContext + " found a valid name in certificate: " + dnsNameInSANCert);
}
break;
}
}
if (logger.isLoggable(Level.FINER)) {
logger.finer(logContext
+ " the following name in certificate does not match the serverName: " + value);
logger.finer(logContext + " certificate:\n" + cert.toString());
}
}
} else {
if (logger.isLoggable(Level.FINER)) {
logger.finer(logContext + " found an invalid san entry: " + sanEntry);
logger.finer(logContext + " certificate:\n" + cert.toString());
}
}
}
}
}
if (!isServerNameValidated) {
MessageFormat form = new MessageFormat(SQLServerException.getErrString("R_certNameFailed"));
Object[] msgArgs = {hostName, dnsNameInSANCert};
throw new CertificateException(form.format(msgArgs));
}
}
/**
* Validate certificate provided in path against server X509 certificate
*
* @param cert
* X509 certificate
* @param certFile
* path to certificate file to validate
* @throws CertificateException
*/
static void validateServerCerticate(X509Certificate cert, String certFile) throws CertificateException {
try (InputStream is = fileToStream(certFile)) {
if (!CertificateFactory.getInstance("X509").generateCertificate(is).equals(cert)) {
MessageFormat form = new MessageFormat(SQLServerException.getErrString("R_serverCertError"));
Object[] msgArgs = {certFile};
throw new CertificateException(form.format(msgArgs));
}
} catch (Exception e) {
MessageFormat form = new MessageFormat(SQLServerException.getErrString("R_serverCertError"));
Object[] msgArgs = {e.getMessage(), certFile, cert.toString()};
throw new CertificateException(form.format(msgArgs));
}
}
private static void logFailMessage(String nameInCert, String hostName) {
if (logger.isLoggable(Level.FINER)) {
logger.finer(logContext + " The name in certificate " + nameInCert + " does not match with the server name "
+ hostName + ".");
}
}
private static void logSuccessMessage(String nameInCert, String hostName) {
if (logger.isLoggable(Level.FINER)) {
logger.finer(logContext + " The name in certificate:" + nameInCert + " validated against server name "
+ hostName + ".");
}
}
// PKCS#12 format
private static final String PKCS12_ALG = "PKCS12";
private static final String SUN_X_509 = "SunX509";
// PKCS#8 format
private static final String PEM_PRIVATE_START = "-----BEGIN PRIVATE KEY-----";
private static final String PEM_PRIVATE_END = "-----END PRIVATE KEY-----";
private static final String JAVA_KEY_STORE = "JKS";
private static final String CLIENT_CERT = "client-cert";
private static final String CLIENT_KEY = "client-key";
// PKCS#1 format
private static final String PEM_RSA_PRIVATE_START = "-----BEGIN RSA PRIVATE KEY-----";
// PVK format
private static final long PVK_MAGIC = 0xB0B5F11EL;
private static final byte[] RSA2_MAGIC = {82, 83, 65, 50};
private static final String RC4_ALG = "RC4";
private static final String RSA_ALG = "RSA";
static KeyStore loadPKCS12KeyStore(String certPath,
String keyPassword) throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException, SQLServerException {
KeyStore keyStore = KeyStore.getInstance(PKCS12_ALG);
try (FileInputStream certStream = new FileInputStream(certPath)) {
keyStore.load(certStream, (keyPassword != null) ? keyPassword.toCharArray() : null);
} catch (FileNotFoundException e) {
throw new SQLServerException(SQLServerException.getErrString("R_readCertError"), null, 0, null);
}
return keyStore;
}
static KeyManager[] readPKCS8Certificate(String certPath, String keyPath,
String keyPassword) throws IOException, GeneralSecurityException, SQLServerException {
Certificate clientCertificate = loadCertificate(certPath);
((X509Certificate) clientCertificate).checkValidity();
PrivateKey privateKey = loadPrivateKey(keyPath, keyPassword);
KeyStore keyStore = KeyStore.getInstance(JAVA_KEY_STORE);
keyStore.load(null, null);
keyStore.setCertificateEntry(CLIENT_CERT, clientCertificate);
keyStore.setKeyEntry(CLIENT_KEY, privateKey, keyPassword.toCharArray(), new Certificate[] {clientCertificate});
KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
kmf.init(keyStore, keyPassword.toCharArray());
return kmf.getKeyManagers();
}
private static KeyManager[] readPKCS12Certificate(String certPath,
String keyPassword) throws NoSuchAlgorithmException, CertificateException, IOException, UnrecoverableKeyException, KeyStoreException, SQLServerException {
KeyStore keyStore = loadPKCS12KeyStore(certPath, keyPassword);
KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(SUN_X_509);
keyManagerFactory.init(keyStore, (keyPassword != null) ? keyPassword.toCharArray() : null);
return keyManagerFactory.getKeyManagers();
}
private static PrivateKey loadPrivateKeyFromPKCS8(
String key) throws NoSuchAlgorithmException, InvalidKeySpecException {
StringBuilder sb = new StringBuilder(key);
deleteFirst(sb, PEM_PRIVATE_START);
deleteFirst(sb, PEM_PRIVATE_END);
byte[] formattedKey = Base64.getDecoder().decode(sb.toString().replaceAll("\\s", ""));
KeyFactory factory = KeyFactory.getInstance(RSA_ALG);
return factory.generatePrivate(new PKCS8EncodedKeySpec(formattedKey));
}
private static void deleteFirst(StringBuilder sb, String str) {
int i = sb.indexOf(str);
if (i != -1) {
sb.delete(i, i + str.length());
}
}
private static PrivateKey loadPrivateKeyFromPKCS1(String key, String keyPass) throws IOException {
SQLServerBouncyCastleLoader.loadBouncyCastle();
try (PEMParser pemParser = new PEMParser(new StringReader(key))) {
Object object = pemParser.readObject();
JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
KeyPair kp;
if (object instanceof PEMEncryptedKeyPair && keyPass != null) {
PEMDecryptorProvider decProv = new JcePEMDecryptorProviderBuilder().build(keyPass.toCharArray());
kp = converter.getKeyPair(((PEMEncryptedKeyPair) object).decryptKeyPair(decProv));
} else {
kp = converter.getKeyPair((PEMKeyPair) object);
}
return kp.getPrivate();
}
}
private static PrivateKey loadPrivateKeyFromPVK(String keyPath,
String keyPass) throws IOException, GeneralSecurityException, SQLServerException {
File f = new File(keyPath);
ByteBuffer buffer = ByteBuffer.allocate((int) f.length());
try (FileInputStream in = new FileInputStream(f); FileChannel channel = in.getChannel()) {
((Buffer) buffer.order(ByteOrder.LITTLE_ENDIAN)).rewind();
long magic = buffer.getInt() & 0xFFFFFFFFL;
if (PVK_MAGIC != magic) {
SQLServerException.makeFromDriverError(null, magic, SQLServerResource.getResource("R_pvkHeaderError"),
"", false);
}
((Buffer) buffer).position(((Buffer) buffer).position() + 8); // skip reserved and keytype
boolean encrypted = buffer.getInt() != 0;
int saltLength = buffer.getInt();
int keyLength = buffer.getInt();
byte[] salt = new byte[saltLength];
buffer.get(salt);
((Buffer) buffer).position(((Buffer) buffer).position() + 8); // skip btype(1b), version(1b), reserved(2b),
// and keyalg(4b)
byte[] key = new byte[keyLength - 8];
buffer.get(key);
if (encrypted) {
MessageDigest digest = MessageDigest.getInstance("SHA1");
digest.update(salt);
if (null != keyPass) {
digest.update(keyPass.getBytes());
}
byte[] hash = digest.digest();
key = getSecretKeyFromHash(key, hash);
}
ByteBuffer buff = ByteBuffer.wrap(key).order(ByteOrder.LITTLE_ENDIAN);
((Buffer) buff).position(RSA2_MAGIC.length); // skip the header
int byteLength = buff.getInt() / 8;
BigInteger publicExponent = BigInteger.valueOf(buff.getInt());
BigInteger modulus = getBigInteger(buff, byteLength);
BigInteger prime1 = getBigInteger(buff, byteLength / 2);
BigInteger prime2 = getBigInteger(buff, byteLength / 2);
BigInteger primeExponent1 = getBigInteger(buff, byteLength / 2);
BigInteger primeExponent2 = getBigInteger(buff, byteLength / 2);
BigInteger crtCoefficient = getBigInteger(buff, byteLength / 2);
BigInteger privateExponent = getBigInteger(buff, byteLength);
RSAPrivateCrtKeySpec spec = new RSAPrivateCrtKeySpec(modulus, publicExponent, privateExponent, prime1,
prime2, primeExponent1, primeExponent2, crtCoefficient);
KeyFactory factory = KeyFactory.getInstance(RSA_ALG);
return factory.generatePrivate(spec);
}
}
static Certificate loadCertificate(
String certificatePem) throws IOException, GeneralSecurityException, SQLServerException {
CertificateFactory certificateFactory = CertificateFactory.getInstance("X509");
try (InputStream certStream = fileToStream(certificatePem)) {
return certificateFactory.generateCertificate(certStream);
}
}
static PrivateKey loadPrivateKey(String privateKeyPemPath,
String privateKeyPassword) throws GeneralSecurityException, IOException, SQLServerException {
String privateKeyPem = getStringFromFile(privateKeyPemPath);
if (privateKeyPem.contains(PEM_PRIVATE_START)) { // PKCS#8 format
return loadPrivateKeyFromPKCS8(privateKeyPem);
} else if (privateKeyPem.contains(PEM_RSA_PRIVATE_START)) { // PKCS#1 format
return loadPrivateKeyFromPKCS1(privateKeyPem, privateKeyPassword);
} else {
return loadPrivateKeyFromPVK(privateKeyPemPath, privateKeyPassword);
}
}
private static boolean startsWithMagic(byte[] b) {
for (int i = 0; i < RSA2_MAGIC.length; i++) {
if (b[i] != RSA2_MAGIC[i])
return false;
}
return true;
}
private static byte[] getSecretKeyFromHash(byte[] originalKey,
byte[] keyHash) throws GeneralSecurityException, SQLServerException {
SecretKey key = new SecretKeySpec(keyHash, 0, 16, RC4_ALG);
byte[] decrypted = decryptSecretKey(key, originalKey);
if (startsWithMagic(decrypted)) {
return decrypted;
}
// Couldn't find magic due to padding, trim the key
Arrays.fill(keyHash, 5, keyHash.length, (byte) 0);
key = new SecretKeySpec(keyHash, 0, 16, RC4_ALG);
decrypted = decryptSecretKey(key, originalKey);
if (startsWithMagic(decrypted)) {
return decrypted;
}
SQLServerException.makeFromDriverError(null, originalKey, SQLServerResource.getResource("R_pvkParseError"), "",
false);
return null;
}
private static byte[] decryptSecretKey(SecretKey key, byte[] encoded) throws GeneralSecurityException {
Cipher cipher = Cipher.getInstance(key.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(encoded);
}
private static BigInteger getBigInteger(ByteBuffer buffer, int length) {
// Add an extra bit for signum
byte[] array = new byte[length + 1];
// Write in reverse because our buffer was set to Little Endian
for (int i = 0; i < length; i++) {
array[array.length - 1 - i] = buffer.get();
}
return new BigInteger(array);
}
private static InputStream fileToStream(String fname) throws IOException, SQLServerException {
try (FileInputStream fis = new FileInputStream(fname); DataInputStream dis = new DataInputStream(fis)) {
byte[] bytes = new byte[dis.available()];
dis.readFully(bytes);
return new ByteArrayInputStream(bytes);
} catch (FileNotFoundException e) {
throw new SQLServerException(SQLServerException.getErrString("R_readCertError"), null, 0, null);
}
}
private static String getStringFromFile(String filePath) throws IOException {
return new String(Files.readAllBytes(Paths.get(filePath)));
}
}
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