Accessing Windows Certificate Store certs via Java?

Question

I'm looking to write something that can enumerate and use (to sign) certificates in CurrentUser/My and LocalMachine/My, but I haven't been able to find anything for the Windows cert store, only Java's own secret store. This link looks promising, but I can only use what ships with Java.

I found this question asked on SO before, but it's from five years ago, which is a long time in computer years. Thanks!

Answer 1

Start Java with -Djavax.net.ssl.trustStoreType=WINDOWS-ROOT.

See http://www.oracle.com/technetwork/articles/javase/security-137537.html for more information.

Answer 2

The cross-platform nature of the Java has its own downsides -- you cannot access some (or many) OS-specific things without external libraries. Windows certificate store is accessible only via CryptoAPI native functions which are not support by Java default installation.

You may take a look at this thread: Calling Win32 API method from Java

If you can use JNA, then you can use various Certificate and Certificate Store Functions in crypt32.dll to enumerate certificates and perform signing operations.

Answer 3

I picked from where Crypt32 left, used JNA to access the certificates using the same windows dialog that pops up if you were to use any windows specific program:

    NativeLibrary cryptUI = NativeLibrary.getInstance("Cryptui");
    NativeLibrary crypt32 = NativeLibrary.getInstance("Crypt32");

    Function functionCertOpenSystemStore = crypt32.getFunction("CertOpenSystemStoreA");
    Object[] argsCertOpenSystemStore = new Object[] { 0, "CA"};
    HANDLE h = (HANDLE) functionCertOpenSystemStore.invoke(HANDLE.class, argsCertOpenSystemStore);

    Function functionCryptUIDlgSelectCertificateFromStore = cryptUI.getFunction("CryptUIDlgSelectCertificateFromStore");
    System.out.println(functionCryptUIDlgSelectCertificateFromStore.getName());
    Object[] argsCryptUIDlgSelectCertificateFromStore = new Object[] { h, 0, 0, 0, 16, 0, 0};
    Pointer ptrCertContext = (Pointer) functionCryptUIDlgSelectCertificateFromStore.invoke(Pointer.class, argsCryptUIDlgSelectCertificateFromStore);

    Function functionCertGetNameString = crypt32.getFunction("CertGetNameStringW");
    char[] ptrName = new char[128];
    Object[] argsCertGetNameString = new Object[] { ptrCertContext, 5, 0, 0, ptrName, 128};
    functionCertGetNameString.invoke(argsCertGetNameString);
    System.out.println("Selected certificate is " + new String(ptrName));

    Function functionCertFreeCertificateContext = crypt32.getFunction("CertFreeCertificateContext");
    Object[] argsCertFreeCertificateContext = new Object[] { ptrCertContext};
    functionCertFreeCertificateContext.invoke(argsCertFreeCertificateContext);

    Function functionCertCloseStore = crypt32.getFunction("CertCloseStore");
    Object[] argsCertCloseStore = new Object[] { h, 0};
    functionCertCloseStore.invoke(argsCertCloseStore);

It is just a piece of code that works; feel free to apply your coding practices.

Answer 4

KeyStore keyStore = KeyStore.getInstance(getKeyStoreType(), "SunMSCAPI");
keyStore.load(null, null);

try {
    Field field = keyStore.getClass().getDeclaredField("keyStoreSpi");
    field.setAccessible(true);

    KeyStoreSpi keyStoreVeritable = (KeyStoreSpi)field.get(keyStore);
    field = keyStoreVeritable.getClass().getEnclosingClass().getDeclaredField("entries");
    field.setAccessible(true);
} catch (Exception e) {
    LOGGER.log(Level.SEVERE, "Set accessible keyStoreSpi problem", e);
}

Enumeration enumeration = keyStore.aliases();