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package ui;
import model.asn1.ASN1Object;
import model.asn1.UtcTime;
import model.asn1.exceptions.ParseException;
import model.asn1.parsing.BytesReader;
import model.ca.Template;
import model.csr.CertificationRequest;
import model.pki.cert.Certificate;
import model.pki.crl.Reason;
import model.pki.crl.RevokedCertificate;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Optional;
/**
* The main screen that handles submenus (mgmt / issue / template), list certs, revoke certs, generate CRLs.
*/
public class MainScreen implements UIHandler {
private final JCA session;
/**
* EFFECTS: Init with the parent session.
*/
public MainScreen(JCA session) {
this.session = session;
}
/**
* EFFECTS: Print help
*/
@Override
public void help() {
System.out.print("mgmt\tView and manage the CA certificate\n"
+ "issue\tIssue a certificate\n"
+ "show\tList all issued certificates\n"
+ "export\tExport a certificate to file (DER)\n"
+ "template\tManage templates\n"
+ "revoke\tRevoke a certificate\n"
+ "crl\t\tSign CRL\n"
+ "log\t\tView audit logs\n"
+ "exit\tExit\n"
+ "help\tPrint this message\n");
}
/**
* EFFECTS: Print each issued cert in Subject Serial Status format.
*/
@Override
public void show() {
session.getCa().getSigned().forEach(cert -> {
System.out.printf("%s\t%d\t%s\n",
cert.getCertificate().getSubject().toString(),
cert.getCertificate().getSerialNumber().getLong(),
session.getCa().getRevoked().stream().anyMatch(rev -> rev.getSerialNumber().getLong()
== cert.getCertificate().getSerialNumber().getLong()) ? "REVOKED" : "OK");
});
}
/**
* EFFECTS: Read the input CSR.
*/
private CertificationRequest handleIssueInputCSR() {
try {
return new CertificationRequest(new BytesReader(session.handleInputPEM("CERTIFICATE REQUEST")),
false);
} catch (ParseException e) {
System.out.println(e.getMessage());
return null;
}
}
/**
* EFFECTS: Handle the issue command. Read CSR, find template, switch to issue screen.
*/
private void handleIssue(String... args) {
if (!session.checkCA(true)) {
return;
}
if (args.length <= 1) {
System.out.println("Usage: issue <template>");
return;
}
Template tmp = session.getCa().findTemplate(args[1], true);
if (tmp == null) {
System.out.println("Cannot find the template specified");
return;
}
CertificationRequest req = handleIssueInputCSR();
if (req != null) {
session.setScreen(Screen.ISSUE, req, new Template(tmp.getName(),
true,
tmp.getSubject(),
tmp.getValidity()));
}
}
/**
* EFFECTS: Find issued and not revoked certificate by serial. Return null if not found.
*/
private Certificate findCertBySerial(int serial) {
Optional<Certificate> c = session.getCa().getSigned()
.stream()
.filter(cert -> cert.getCertificate().getSerialNumber().getLong() == serial)
.findFirst();
if (c.isEmpty()) {
System.out.println("Cannot find the certificate specified");
return null;
}
if (session.getCa().getRevoked().stream().anyMatch(rev -> rev.getSerialNumber().getLong() == serial)) {
System.out.println("The certificate has already been revoked.");
return null;
}
return c.get();
}
/**
* EFFECTS: Handle the revoke command and log it.
* MODIFIES: session
*/
private void handleRevoke(String... args) {
if (args.length < 3) {
System.out.println("Usage: revoke <serial> <reason>");
return;
}
try {
final Reason reason = Reason.valueOf(args[2]);
int serial = Integer.parseInt(args[1]);
Certificate c = findCertBySerial(serial);
if (c == null) {
return;
}
session.getCa().revoke(new RevokedCertificate(ASN1Object.TAG_SEQUENCE, null,
c.getCertificate().getSerialNumber(),
new UtcTime(UtcTime.TAG, null, ZonedDateTime.now(ZoneId.of("UTC"))), reason));
} catch (IllegalArgumentException ignored) {
System.out.println("Illegal serial number or reason");
}
}
/**
* EFFECTS: Export a cert to file
*/
private void handleExport(String... args) {
if (args.length < 3) {
System.out.println("Usage: export <serial> <path>");
return;
}
try {
int serial = Integer.parseInt(args[1]);
Certificate c = findCertBySerial(serial);
if (c == null) {
return;
}
final File fd = new File(args[2]);
final OutputStream out = new FileOutputStream(fd);
out.write(Utils.byteToByte(c.encodeDER()));
out.close();
} catch (IllegalArgumentException ignored) {
System.out.println("Illegal serial number");
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
/**
* EFFECTS: Issue a CRL and do audit log.
* MODIFIES: session
*/
private void handleCRL() {
if (!session.checkCA(true)) {
return;
}
try {
System.out.println(Utils.toPEM(session.getCa().signCRL().encodeDER(), "X509 CRL"));
} catch (Throwable e) {
System.out.println(e.getMessage());
}
}
/**
* EFFECTS: Handle commands
*/
@Override
public void command(String... args) {
switch (args[0]) {
case "mgmt":
session.setScreen(Screen.MGMT);
return;
case "issue":
handleIssue(args);
return;
case "revoke":
handleRevoke(args);
return;
case "export":
handleExport(args);
return;
case "template":
session.setScreen(Screen.TEMPLATES);
return;
case "crl":
handleCRL();
return;
}
help();
}
/**
* EFFECTS: Exit the program
*/
@Override
public Screen exit() {
return null;
}
/**
* EFFECTS: return "/ %"
*/
@Override
public String getPS1() {
return "/ %";
}
}
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