Showing posts with label rsa. Show all posts
Showing posts with label rsa. Show all posts

Sunday, September 14, 2014

How to convert java keystore to format apache httpd understand

If you received a java keystore file from a Certificate Authority and want to use this cert to setup in apache httpd ssl, you will meet failure, at least I did. So today, I will share my finding on how to convert java keystore file into PEM format which is understand by apache httpd.

So how do you know if a certificate signed by CA is of type java keystore? Simple, just check the content using keytool. Keytool is an app come together when you install java environment.
$ keytool -list -keystore abc.jks
Enter keystore password:

Keystore type: JKS
Keystore provider: SUN

Your keystore contains 1 entry

ABC_Certificate, Aug 19, 2013, PrivateKeyEntry,
Certificate fingerprint (MD5): 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00

As you can read above, this is a valid java keystore file and we will now convert to a intermittent format, pkcs12 first. We will use keytool again to do the conversion.
$ keytool -importkeystore -srckeystore abc.jks -destkeystore abc.p12 -srcalias ABC_Certificate -srcstoretype jks -deststoretype pkcs12
Enter destination keystore password:
Re-enter new password:
Enter source keystore password:

the output abc.p12 is the certificate in pkcs12 and now we are ready to convert to pem format. We will use openssl to do this conversion.
$ openssl pkcs12 -in myapp.p12 -out myapp.pem
Enter Import Password:
MAC verified OK
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:

You can basically use myapp.pem for the field in SSLCertificateFile and SSLCertificateKeyFile but unfortunately when apache httpd is restarted, it will ask for the private key passphrase. With the following steps, we will remove the passphrase from the private key.

Removed passphrase so when apache httpd instance is restarted, it will not ask for password.
$ openssl rsa -in abc.pem -out abc_private_key.pem
Enter pass phrase for abc.pem:
writing RSA key
$ openssl x509 -in abc.pem >>abc_cert.pem

As you noticed, right now you end up with the certificate private key and the certificate. Now move these two files, abc_private_key.pem and abc_cert.pem to a directory in the apache httpd server and change the ssl configuration in apache httpd.
SSLCertificateFile    /path/to/the/directory/contain/abc_cert.pem
SSLCertificateKeyFile /path/to/the/directory/contain/abc_private_key.pem

That's it, I hope it works for you too.