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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2015 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.certsrv.client;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Enumeration;
import org.mozilla.jss.crypto.X509Certificate;
import org.mozilla.jss.ssl.SSLCertificateApprovalCallback;
public class PKICertificateApprovalCallback implements SSLCertificateApprovalCallback {
public PKIClient client;
public PKICertificateApprovalCallback(PKIClient client) {
this.client = client;
}
// NOTE: The following helper method defined as
// 'public String displayReason(int reason)'
// should be moved into the JSS class called
// 'org.mozilla.jss.ssl.SSLCertificateApprovalCallback'
// under its nested subclass called 'ValidityStatus'.
// While all reason values should be unique, this method has been
// written to return the name of the first defined reason that is
// encountered which contains the requested value, or null if no
// reason containing the requested value is encountered.
public String displayReason(int reason) {
for (Field f : ValidityStatus.class.getDeclaredFields()) {
int mod = f.getModifiers();
if (Modifier.isStatic(mod) &&
Modifier.isPublic(mod) &&
Modifier.isFinal(mod)) {
try {
int value = f.getInt(null);
if (value == reason) {
return f.getName();
}
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
}
return null;
}
public String getMessage(X509Certificate serverCert, int reason) {
if (reason == SSLCertificateApprovalCallback.ValidityStatus.BAD_CERT_DOMAIN) {
return "BAD_CERT_DOMAIN encountered on '"+serverCert.getSubjectDN()+"' indicates a common-name mismatch";
}
if (reason == SSLCertificateApprovalCallback.ValidityStatus.UNTRUSTED_ISSUER) {
return "UNTRUSTED ISSUER encountered on '" +
serverCert.getSubjectDN() + "' indicates a non-trusted CA cert '" +
serverCert.getIssuerDN() + "'";
}
if (reason == SSLCertificateApprovalCallback.ValidityStatus.CA_CERT_INVALID) {
return "CA_CERT_INVALID encountered on '"+serverCert.getSubjectDN()+"' results in a denied SSL server cert!";
}
String reasonName = displayReason(reason);
if (reasonName != null) {
return reasonName+" encountered on '"+serverCert.getSubjectDN()+"' results in a denied SSL server cert!";
}
return "Unknown/undefined reason "+reason+" encountered on '"+serverCert.getSubjectDN()+"' results in a denied SSL server cert!";
}
public boolean handleUntrustedIssuer(X509Certificate serverCert) {
try {
System.out.print("Import CA certificate (Y/n)? ");
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String line = reader.readLine().trim();
if (!line.equals("") && !line.equalsIgnoreCase("Y"))
return false;
String caServerURI = "http://" + client.getConfig().getServerURI().getHost() + ":8080/ca";
System.out.print("CA server URI [" + caServerURI + "]: ");
System.out.flush();
line = reader.readLine().trim();
if (!line.equals("")) {
caServerURI = line;
}
if (client.verbose) System.out.println("Downloading CA certificate chain from " + caServerURI + ".");
byte[] bytes = client.downloadCACertChain(caServerURI);
if (client.verbose) System.out.println("Importing CA certificate chain.");
client.importCACertPackage(bytes);
if (client.verbose) System.out.println("Imported CA certificate.");
return true;
} catch (Exception e) {
System.err.println("ERROR: "+e);
return false;
}
}
// Callback to approve or deny returned SSL server cert.
// Right now, simply approve the cert.
public boolean approve(X509Certificate serverCert,
SSLCertificateApprovalCallback.ValidityStatus status) {
boolean approval = true;
if (client.verbose) System.out.println("Server certificate: "+serverCert.getSubjectDN());
SSLCertificateApprovalCallback.ValidityItem item;
// If there are no items in the Enumeration returned by
// getReasons(), you can assume that the certificate is
// trustworthy, and return true to allow the connection to
// continue, or you can continue to make further tests of
// your own to determine trustworthiness.
Enumeration<?> errors = status.getReasons();
while (errors.hasMoreElements()) {
item = (SSLCertificateApprovalCallback.ValidityItem) errors.nextElement();
int reason = item.getReason();
if (client.isRejected(reason)) {
if (!client.statuses.contains(reason))
System.err.println("ERROR: " + getMessage(serverCert, reason));
approval = false;
} else if (client.isIgnored(reason)) {
// Ignore validity status
} else if (reason == SSLCertificateApprovalCallback.ValidityStatus.UNTRUSTED_ISSUER) {
// Issue a WARNING, but allow this process
// to continue since we haven't installed a trusted CA
// cert for this operation.
if (!client.statuses.contains(reason)) {
System.err.println("WARNING: " + getMessage(serverCert, reason));
handleUntrustedIssuer(serverCert);
}
} else if (reason == SSLCertificateApprovalCallback.ValidityStatus.BAD_CERT_DOMAIN) {
// Issue a WARNING, but allow this process to continue on
// common-name mismatches.
if (!client.statuses.contains(reason))
System.err.println("WARNING: " + getMessage(serverCert, reason));
} else if (reason == SSLCertificateApprovalCallback.ValidityStatus.CA_CERT_INVALID) {
// Set approval false to deny this
// certificate so that the connection is terminated.
// (Expect an IOException on the outstanding
// read()/write() on the socket).
if (!client.statuses.contains(reason))
System.err.println("ERROR: " + getMessage(serverCert, reason));
approval = false;
} else {
// Set approval false to deny this certificate so that
// the connection is terminated. (Expect an IOException
// on the outstanding read()/write() on the socket).
if (!client.statuses.contains(reason))
System.err.println("ERROR: " + getMessage(serverCert, reason));
approval = false;
}
client.statuses.add(reason);
}
return approval;
}
}
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