com.yahoo.athenz.common.utils.X509CertUtils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of athenz-client-common Show documentation
Show all versions of athenz-client-common Show documentation
Athenz Client Common Package
The newest version!
/*
* Copyright The Athenz Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.yahoo.athenz.common.utils;
import com.yahoo.athenz.auth.Principal;
import com.yahoo.athenz.auth.util.Crypto;
import org.apache.commons.codec.binary.Hex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPublicKey;
import java.util.List;
public class X509CertUtils {
static final String ZTS_CERT_INSTANCE_ID_DNS = ".instanceid.athenz.";
static final String ZTS_CERT_INSTANCE_ID_URI = "athenz://instanceid/";
static final String ZTS_CERT_HOSTNAME_URI = "athenz://hostname/";
private static final Logger LOGGER = LoggerFactory.getLogger(X509CertUtils.class);
private static final ThreadLocal TLS_BUILDER = ThreadLocal.withInitial(() -> new StringBuilder(256));
public static String extractRequestInstanceIdFromURI(final List uriList) {
for (String uri : uriList) {
if (!uri.startsWith(ZTS_CERT_INSTANCE_ID_URI)) {
continue;
}
// skip the provider value
int idx = uri.indexOf('/', ZTS_CERT_INSTANCE_ID_URI.length());
if (idx != -1) {
return uri.substring(idx + 1);
}
}
return null;
}
/**
* extractProvider derives the provider from athenz://instanceid San URI
* @param cert X509Certificate
* @return provider from San URI, "" if provider is not found.
*/
public static String extractProvider(X509Certificate cert) {
if (cert == null) {
return "";
}
for (String uri : Crypto.extractX509CertURIs(cert)) {
if (!uri.startsWith(ZTS_CERT_INSTANCE_ID_URI)) {
continue;
}
// extract the first field after the prefix, separated by '/'
int prefixLen = ZTS_CERT_INSTANCE_ID_URI.length();
int idx = uri.indexOf('/', prefixLen);
return idx == -1
? ""
: uri.substring(prefixLen, idx);
}
return "";
}
public static String extractItemFromURI(final List uriList, final String item) {
for (String uri : uriList) {
if (uri.startsWith(item)) {
return uri.substring(item.length());
}
}
return null;
}
public static String extractRequestInstanceIdFromDnsNames(final List dnsNames) {
for (String dnsName : dnsNames) {
int idx = dnsName.indexOf(ZTS_CERT_INSTANCE_ID_DNS);
if (idx != -1) {
return dnsName.substring(0, idx);
}
}
return null;
}
/**
* extractHostname returns the hostname found in the athenz://hostname SanURI entry
* @param cert X509Certficate
* @return hostname found in SanURI, "" if no hostname is found
*/
public static String extractHostname(X509Certificate cert) {
if (cert == null) {
return "";
}
String hostname = extractItemFromURI(Crypto.extractX509CertURIs(cert), ZTS_CERT_HOSTNAME_URI);
return hostname == null ? "" : hostname;
}
public static String extractRequestInstanceId(X509Certificate cert) {
if (cert == null) {
return null;
}
// first we're going to look for our uri field to see
// if we have an instance id uri available. the format is:
// athenz://instanceid//
final List uriList = Crypto.extractX509CertURIs(cert);
final String instanceId = extractRequestInstanceIdFromURI(uriList);
if (instanceId != null) {
return instanceId;
}
// if no uri, then we'll fall back to our old dnsName field
final List dnsNames = Crypto.extractX509CertDnsNames(cert);
return extractRequestInstanceIdFromDnsNames(dnsNames);
}
/**
* extractKeyModulus is a helper function to extract the Key Modulus CN from the leaf certificate
* present at the zeroth position in jakarta.servlet.request.X509Certificate
* @param certs an array of X509Certificate
* @return the string representing the key modulus
*/
public static String extractKeyModulus(X509Certificate[] certs) {
if (certs == null || certs.length == 0) {
return "";
}
return extractKeyModulus(certs[0]);
}
/**
* extractKeyModulus returns the modulus for the RSA public key in the certificate
* @param cert X509Certificate to extract the key modulus from
* @return modulus as string, and empty "" for non RSA certificate
*/
public static String extractKeyModulus(X509Certificate cert) {
try {
RSAPublicKey pub = (RSAPublicKey) cert.getPublicKey();
return pub.getModulus().toString(16);
} catch (ClassCastException e) {
LOGGER.error("unable to convert the public key to RSA", e);
}
return "";
}
/**
* extracSubjectDn is a helper function to extract the Subject DN from the leaf certificate
* present at the zeroth position in jakarta.servlet.request.X509Certificate
* @param certs an array of X509Certificate
* @return subject DN as a string
*/
public static String extractSubjectDn(X509Certificate[] certs) {
if (certs == null || certs.length == 0) {
return "";
}
return extractSubjectDn(certs[0]);
}
/**
* extractSubjectDn returns the DN from the certificate passed in
* @param cert X509Certificate to extract the Subject DN from
* @return the string representing Subject DN
*/
public static String extractSubjectDn(X509Certificate cert) {
return cert.getSubjectX500Principal().getName();
}
/**
* extractCn is a helper function to extract the Subject CN from the leaf certificate
* present at the zeroth position in jakarta.servlet.request.X509Certificate
* @param certs an array of X509Certificate
* @return the string representing Subject CN
*/
public static String extractCn(X509Certificate[] certs) {
if (certs == null || certs.length == 0) {
return "";
}
return extractCn(certs[0]);
}
/**
* extractCn returns CN portion of the Subject DN of the certificate
* @param cert X509Certificate to extract the CN from
* @return string representing the Subject CN
*/
public static String extractCn(X509Certificate cert) {
return Crypto.extractX509CertCommonName(cert);
}
/**
* extractIssuerDn is a helper function to extract the Issuer DN from the leaf certificate
* present at the zeroth position in jakarta.servlet.request.X509Certificate
* @param certs an array of X509Certificate
* @return the string representing issuer DN
*/
public static String extractIssuerDn(X509Certificate[] certs) {
if (certs == null || certs.length == 0) {
return "";
}
return Crypto.extractIssuerDn(certs[0]);
}
/**
* @deprecated use com.yahoo.athenz.auth.util.Crypto.extractIssuerDn instead
* extractIssuerDn returns the IssuerDN from the certificate passed in
* @param cert X509Certificate to extract the DN from
* @return string with Issuer DN
*/
@Deprecated
public static String extractIssuerDn(X509Certificate cert) {
return Crypto.extractIssuerDn(cert);
}
/**
* extractIssuerCn is a helper function to extract the Issuer CN from the leaf certificate
* present at the zeroth position in jakarta.servlet.request.X509Certificate
* @param certs an array of X509Certificate
* @return the string representing issuer CN
*/
public static String extractIssuerCn(X509Certificate[] certs) {
if (certs == null || certs.length == 0) {
return "";
}
return extractIssuerCn(certs[0]);
}
/**
* extractIssuerCn returns the CN portion of the Issuer DN from the certificate passed in
* @param cert X509Certificate to extract the Issuer CN from
* @return the string containing the issuer CN
*/
public static String extractIssuerCn(X509Certificate cert) {
return Crypto.extractX509CertIssuerCommonName(cert);
}
/**
* hexKeyMod returns the HEX encoded string of SHA256 of the Key Modulus of the leaf certificate
* present at the zeroth position in jakarta.servlet.request.X509Certificate
* @param certs an array of X509Certificate
* @param toUpperCase to indicate whether the hex encoded result should be upper case or not
* @return the string with hex encoded of SHA256 of the Key Modulus of the leaf certificate
*/
public static String hexKeyMod(X509Certificate[] certs, final boolean toUpperCase) {
if (certs == null || certs.length == 0) {
return "";
}
String modulus = X509CertUtils.extractKeyModulus(certs);
if (modulus.isEmpty()) {
return "";
}
if (toUpperCase) {
modulus = modulus.toUpperCase();
}
return Hex.encodeHexString(Crypto.sha256(modulus.getBytes(StandardCharsets.UTF_8)));
}
public static void logCert(final Logger certLogger, final Principal principal,
final String ip, final String provider, final String instanceId,
final X509Certificate x509Cert) {
if (certLogger == null) {
return;
}
// generate our cert object log record and log it
// with the given logger
try {
certLogger.info(logRecord(principal, ip, provider, instanceId, x509Cert));
} catch (Exception ex) {
LOGGER.error("Unable to generate certificate log record: {}", ex.getMessage());
}
}
public static void logSSH(final Logger certLogger, final Principal principal, final String ip,
final String service, final String instanceId) {
if (certLogger == null) {
return;
}
// our format is going to be as follows
//
certLogger.info("{} {} {} {}", ip, principal, service, instanceId);
}
public static String logRecord(final Principal principal, final String ip, final String provider,
final String instanceId, final X509Certificate x509Cert) {
StringBuilder buf = TLS_BUILDER.get();
buf.setLength(0);
// our format is going to be as follows
//
buf.append(ip);
buf.append(' ');
// now append our principal. if this is an instance register
// operation then we have no principal so we're going to
// just use - to indicate no principal
if (principal != null) {
buf.append(principal.getFullName());
} else {
buf.append('-');
}
buf.append(' ');
// next our provider
buf.append(provider);
buf.append(' ');
// next our instance id
if (instanceId != null) {
buf.append('"');
buf.append(instanceId);
buf.append('"');
} else {
buf.append('-');
}
buf.append(' ');
// next our subject
buf.append('"');
buf.append(x509Cert.getSubjectX500Principal().getName());
buf.append('"');
buf.append(' ');
// next we have our issuer
buf.append('"');
buf.append(x509Cert.getIssuerX500Principal().getName());
buf.append('"');
buf.append(' ');
// next we have our serial number
buf.append(x509Cert.getSerialNumber().toString());
buf.append(' ');
// finally we have our expiry date in milliseconds
buf.append(x509Cert.getNotAfter().getTime());
return buf.toString();
}
}