Simple java cmd line util to check if a keystore contains a given certificate
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import java.nio.file.Files; | |
import java.nio.file.Path; | |
import java.nio.file.Paths; | |
import java.security.KeyStore; | |
import java.security.cert.Certificate; | |
import java.security.cert.CertificateFactory; | |
import java.security.cert.PKIXParameters; | |
import java.security.cert.TrustAnchor; | |
public class CheckCertificate { | |
public static void main(String[] args) throws Exception { | |
if (args.length < 1 || args.length > 3) { | |
System.err.println( | |
"Usage: java CheckCertificate certificate [keystore [keystorePass]]"); | |
System.err.println(); | |
System.err.println(" certificate: file containing the .crt certificate"); | |
System.err.println(" [keystore]: optional keystore location, " + | |
"defaults to cacerts of current VM"); | |
System.err.println(" [keystorePass]: optional keystore password, " + | |
"defaults to 'changeit'"); | |
System.exit(1); | |
} | |
Path cacertsPath; | |
if (args.length > 1) { | |
cacertsPath = Paths.get(args[1]); | |
} else { | |
cacertsPath = Paths.get(System.getProperty("java.home"), | |
"lib", | |
"security", | |
"cacerts"); | |
} | |
if (!Files.isReadable(cacertsPath)) { | |
System.err.println("Can't read keystore: " + cacertsPath); | |
System.exit(-1); | |
} | |
Path certificatePath = Paths.get(args[0]); | |
if (!Files.isReadable(certificatePath)) { | |
System.err.println("Can't read certificate: " + certificatePath); | |
System.exit(-2); | |
} | |
Certificate certificate = CertificateFactory | |
.getInstance("X.509") | |
.generateCertificate(Files.newInputStream(certificatePath)); | |
String keystorePass = args.length == 3 ? args[2] : "changeit"; | |
KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType()); | |
keystore.load(Files.newInputStream(cacertsPath), keystorePass.toCharArray()); | |
PKIXParameters params = new PKIXParameters(keystore); | |
boolean found = params.getTrustAnchors() | |
.stream() | |
.map(TrustAnchor::getTrustedCert) | |
.anyMatch(trustedCert -> trustedCert.equals(certificate)); | |
if (found) { | |
System.out.println("The certificate is present on the keystore."); | |
} else { | |
System.out.println("Can't found the certificate on the keystore."); | |
} | |
} | |
} |
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