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package ui;
import model.asn1.ASN1Object;
import model.asn1.BitString;
import model.asn1.Bool;
import model.asn1.ObjectIdentifier;
import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
import model.csr.CertificationRequest;
import model.pki.SubjectPublicKeyInfo;
import model.pki.cert.Certificate;
import model.pki.cert.Extension;
import model.pki.cert.TbsCertificate;
import java.util.Arrays;
import java.util.Base64;
import java.util.BitSet;
/**
* Manage the private key and CA certificate. It can print the public key, generate CSR, and install CA cert.
*/
public class MgmtScreen implements UIHandler {
private final JCA session;
/**
* EFFECTS: Init with the parent session.
*/
public MgmtScreen(JCA session) {
this.session = session;
}
/**
* EFFECTS: Print help
*/
@Override
public void help() {
System.out.print("show\tView the public key and CA certificate\n"
+ "csr\tGenerate a CSR for a upper-level CA to sign\n"
+ "install\tInstall a CA certificate\n"
+ "exit\tGo to main menu\n"
+ "help\tPrint this message\n");
}
/**
* EFFECTS: Format the public key and CA
*/
@Override
public void show() {
System.out.printf("Public Key:\t%s\n",
Base64.getEncoder().encodeToString(session.getCa().getPublicKey().getEncoded()));
if (!session.checkCA(true)) {
return;
}
final TbsCertificate info = session.getCa().getCertificate().getCertificate();
System.out.printf("Subject:\t%s\n", info.getSubject().toString());
System.out.printf("Issuer:\t%s\n", info.getIssuer().toString());
System.out.printf("Not Before:\t%s\n", info.getValidity().getNotBefore().getTimestamp());
System.out.printf("Not After:\t%s\n", info.getValidity().getNotAfter().getTimestamp());
System.out.printf("Signature:\t%s\n",
Base64.getEncoder().encodeToString(Utils.byteToByte(info.getSubjectPublicKeyInfo()
.getSubjectPublicKey().getConvertedVal())));
}
/**
* EFFECT: Generate a CSR
*/
private void handleCSR() {
if (!session.checkCA(false)) {
return;
}
try {
CertificationRequest req = session.getCa().signCSR();
System.out.println(Utils.toPEM(req.encodeDER(), "CERTIFICATE REQUEST"));
session.log("Signed CA CSR.");
} catch (Throwable e) {
System.out.println(e.getMessage());
}
}
/**
* EFFECTS: Throw {@link ParseException} if the incoming cert is not v3.
*/
private void validateCACertificateVersion(Certificate cert) throws ParseException {
if (cert.getCertificate().getVersion() == null
|| cert.getCertificate().getVersion().getLong() != TbsCertificate.VERSION_V3) {
throw new ParseException("The input certificate must be V3");
}
}
/**
* EFFECTS: Throw {@link ParseException} if the incoming cert does not have the matching public key.
*/
private void validateCACertificatePublicKey(Certificate cert) throws ParseException {
final SubjectPublicKeyInfo expectedPKInfo = session.getCa().getCAPublicKeyInfo();
if (!Arrays.equals(cert.getCertificate().getSubjectPublicKeyInfo().getAlgorithm().getType().getInts(),
expectedPKInfo.getAlgorithm().getType().getInts())
|| !Arrays.equals(cert.getCertificate().getSubjectPublicKeyInfo().getSubjectPublicKey().getVal(),
expectedPKInfo.getSubjectPublicKey().getVal())) {
throw new ParseException("The input certificate does not have the corresponding public key");
}
}
/**
* EFFECTS: Throw {@link ParseException} if the incoming cert does not have cA = true in its basicConstraints.
*/
private void validateCACertificateBasicConstraints(Certificate cert) throws ParseException {
final Extension basicConstraints = cert.getCertificate().getExtension(ObjectIdentifier.OID_BASIC_CONSTRAINTS);
if (basicConstraints == null
|| basicConstraints.getExtnValue().getBytes().length <= 0) {
throw new ParseException("The certificate does not have a valid basicConstraints extension.");
}
final ASN1Object basicConstraintsValue =
new ASN1Object(new BytesReader(basicConstraints.getExtnValue().getBytes()), false);
if (basicConstraintsValue.getLength() <= 0) {
throw new ParseException("The certificate does not have a valid basicConstraints extension.");
}
final ASN1Object bool =
ASN1Object.parse(new BytesReader(basicConstraintsValue.encodeValueDER()), false);
if (!(bool instanceof Bool)
|| !((Bool) bool).getValue()) {
throw new ParseException("The certificate does not have a valid basicConstraints extension.");
}
}
/**
* EFFECTS: Throw {@link ParseException} if the incoming cert does not have valid key usages.
*/
private void validateCACertificateKeyUsage(Certificate cert) throws ParseException {
final Extension keyUsage = cert.getCertificate().getExtension(ObjectIdentifier.OID_KEY_USAGE);
if (keyUsage == null
|| keyUsage.getExtnValue().getBytes().length <= 0) {
throw new ParseException("The certificate does not have a valid keyUsage extension.");
}
final ASN1Object keyUsageValue =
ASN1Object.parse(new BytesReader(keyUsage.getExtnValue().getBytes()), false);
if (keyUsageValue.getLength() <= 0
|| !(keyUsageValue instanceof BitString)) {
throw new ParseException("The certificate does not have a valid keyUsage extension.");
}
final BitSet bitSet = BitSet.valueOf(Utils.byteToByte(((BitString) keyUsageValue).getVal()));
if (!bitSet.get(7) || !bitSet.get(2) || !bitSet.get(1)) {
throw new ParseException("The certificate does not have a valid keyUsage extension.");
}
}
/**
* EFFECTS: Handle the 'install' command. Read incoming certificate and validate it.
*/
private void handleInstall() {
if (!session.checkCA(false)) {
return;
}
try {
final Byte[] in = session.handleInputPEM("CERTIFICATE");
Certificate cert = new Certificate(new BytesReader(in), false);
validateCACertificateVersion(cert);
validateCACertificatePublicKey(cert);
validateCACertificateBasicConstraints(cert);
validateCACertificateKeyUsage(cert);
session.getCa().installCertificate(cert);
session.log("A CA certificate is installed.");
} catch (ParseException e) {
System.out.println(e.getMessage());
}
}
/**
* EFFECTS: Handle commands.
*/
@Override
public void command(String... args) {
switch (args[0]) {
case "csr":
handleCSR();
break;
case "install":
handleInstall();
break;
default:
help();
break;
}
}
/**
* EFFECTS: Go to main menu
*/
@Override
public Screen exit() {
return Screen.MAIN;
}
/**
* EFFECTS: return "/ca/ #"
*/
@Override
public String getPS1() {
return "/ca/ #";
}
}
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