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WildFly Security Entity SASL Implementation
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2015 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 org.wildfly.security.sasl.entity;
import static org.wildfly.security.asn1.ASN1.*;
import static org.wildfly.security.mechanism._private.ElytronMessages.saslEntity;
import static org.wildfly.security.sasl.entity.Entity.*;
import static org.wildfly.security.x500.GeneralName.*;
import static org.wildfly.security.x500.TrustedAuthority.*;
import java.io.ByteArrayInputStream;
import java.security.SecureRandom;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.CertificateParsingException;
import java.security.cert.CertPath;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Random;
import java.util.concurrent.ThreadLocalRandom;
import javax.security.auth.x500.X500Principal;
import org.wildfly.security.asn1.ASN1Exception;
import org.wildfly.security.asn1.DERDecoder;
import org.wildfly.security.asn1.DEREncoder;
import org.wildfly.security.x500.GeneralName;
import org.wildfly.security.x500.TrustedAuthority;
import org.wildfly.security.x500.X500;
import org.wildfly.security.x500.util.X500PrincipalUtil;
/**
* @author Farah Juma
*/
class EntityUtil {
private static final byte[] randomCharDictionary;
static {
byte[] dict = new byte[93];
int i = 0;
for (byte c = '!'; c < ','; c ++) {
dict[i ++] = c;
}
for (byte c = ',' + 1; c < 127; c ++) {
dict[i ++] = c;
}
assert i == dict.length;
randomCharDictionary = dict;
}
/* -- Methods used to encode ASN.1 data structures required for entity authentication -- */
/**
* Encode an ASN.1 set of certificates using the given DER encoder and the
* given {@code X509Certificate} chain.
*
* @param encoder the DER encoder
* @param certChain the X.509 certificate chain to encode
* @throws ASN1Exception if an error occurs while encoding the given certificate chain
*/
public static void encodeX509CertificateChain(final DEREncoder encoder, X509Certificate[] certChain) throws ASN1Exception {
try {
int chainSize = certChain.length;
encoder.startSetOf();
for (int i = 0; i < chainSize; i++) {
encoder.writeEncoded(certChain[i].getEncoded());
}
encoder.endSetOf();
} catch (CertificateEncodingException e) {
throw new ASN1Exception(e);
}
}
/**
*
* Encode an {@code AlgorithmIdentifier} without any parameters using the given
* DER encoder and object identifier, where {@code AlgorithmIdentifier} is defined as:
*
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL
* }
*
*
*
* @param encoder the DER encoder
* @param objectIdentifier the object identifier for the algorithm
* @param omitParametersField {@code true} if the parameters field should be ommitted in
* the encoding and {@code false} otherwise
* @throws ASN1Exception if the given object identifier is invalid
*/
public static void encodeAlgorithmIdentifier(final DEREncoder encoder, String objectIdentifier,
boolean omitParametersField) throws ASN1Exception {
encoder.startSequence();
encoder.encodeObjectIdentifier(objectIdentifier);
if (!omitParametersField) {
encoder.encodeNull();
}
encoder.endSequence();
}
/**
*
* Encode an {@code AlgorithmIdentifier} using the given DER encoder, where
* {@code AlgorithmIdentifier} is defined as:
*
*
* AlgorithmIdentifier ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* parameters ANY DEFINED BY algorithm OPTIONAL
* }
*
*
*
* @param encoder the DER encoder
* @param algorithm the algorithm name
* @throws ASN1Exception if the given algorithm name is unrecognised
*/
public static void encodeAlgorithmIdentifier(final DEREncoder encoder, String algorithm) throws ASN1Exception {
// Determine whether or not the parameters field should be omitted in the encoding,
// as specified in RFC 3279 (http://www.ietf.org/rfc/rfc3279)
boolean omitParametersField;
switch (algorithm) {
case SHA1_WITH_RSA: {
omitParametersField = false;
break;
}
case SHA1_WITH_DSA:
case SHA1_WITH_ECDSA: {
omitParametersField = true;
break;
}
default: throw saslEntity.asnUnrecognisedAlgorithm(algorithm);
}
encodeAlgorithmIdentifier(encoder, algorithmOid(algorithm), omitParametersField);
}
/**
*
* Encode a {@code GeneralNames} element using the given DER encoder, where
* {@code GeneralNames} is defined as:
*
*
* GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
*
*
*
* @param encoder the DER encoder
* @param generalNames the general names, as a {@code List} where each entry is a {@link GeneralName}
* @throws ASN1Exception if any of the general names are invalid
*/
public static void encodeGeneralNames(final DEREncoder encoder, List generalNames) throws ASN1Exception {
encoder.startSequence();
for (GeneralName generalName : generalNames) {
generalName.encodeTo(encoder);
}
encoder.endSequence();
}
/**
* Encode a {@code GeneralNames} element consisting of one general name using
* the given DER encoder.
*
* @param encoder the DER encoder
* @param generalName the general name
* @throws ASN1Exception if the general name is invalid
*/
public static void encodeGeneralNames(final DEREncoder encoder, GeneralName generalName) throws ASN1Exception {
List generalNames = new ArrayList(1);
generalNames.add(generalName);
encodeGeneralNames(encoder, generalNames);
}
public static void encodeGeneralNames(final DEREncoder encoder, String subjectName,
Collection> subjectAltNames) throws ASN1Exception {
encoder.startSequence();
if (! subjectName.isEmpty()) {
new DirectoryName(subjectName).encodeTo(encoder);
}
if (subjectAltNames != null) {
for (List altName : subjectAltNames) {
convertToGeneralName(altName).encodeTo(encoder);
}
}
encoder.endSequence();
}
/**
*
* Encode a {@code RandomNumber} element using the given DER encoder, where
* {@code RandomNumber} is defined as:
*
*
* RandomNumber ::= OCTET STRING (SIZE(8..MAX))
*
*
*
* @param encoder the DER encoder
* @param secureRandom the secure random to use (may be null)
*/
public static byte[] encodeRandomNumber(final DEREncoder encoder, SecureRandom secureRandom) {
Random random = secureRandom != null ? secureRandom : ThreadLocalRandom.current();
byte[] randomA = generateRandomString(48, random);
encoder.encodeOctetString(randomA);
return randomA;
}
public static byte[] generateRandomString(int length, Random random) {
final byte[] chars = new byte[length];
for (int i = 0; i < length; i ++) {
chars[i] = randomCharDictionary[random.nextInt(93)];
}
return chars;
}
/**
* Encode an ASN.1 sequence of trusted authorities using the given DER encoder.
*
* @param encoder the DER encoder
* @param trustedAuthorities the trusted authorities as a {@code List} where each entry must
* be a {@link NameTrustedAuthority}, a {@link CertificateTrustedAuthority}, or a {@link HashTrustedAuthority}
* @throws ASN1Exception if any of the trusted authorities are invalid
*/
public static void encodeTrustedAuthorities(final DEREncoder encoder,
List trustedAuthorities) throws ASN1Exception {
encoder.startSequence();
for (TrustedAuthority trustedAuthority : trustedAuthorities) {
trustedAuthority.encodeTo(encoder);
}
encoder.endSequence();
}
/* -- Methods used to decode ASN.1 data structures required for entity authentication -- */
/**
* Decode the next element from the given DER decoder as a {@code GeneralNames} element.
*
* @param decoder the DER decoder
* @return the general names
* @throws ASN1Exception if the next element from the given decoder is not a general names element
*/
public static List decodeGeneralNames(final DERDecoder decoder) throws ASN1Exception {
List generalNames = new ArrayList();
GeneralName generalName = null;
decoder.startSequence();
while (decoder.hasNextElement()) {
out: {
for (int generalNameType = 0; generalNameType <= 8; generalNameType++) {
switch (generalNameType) {
case OTHER_NAME:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, true)) {
decoder.decodeImplicit(generalNameType);
decoder.startSequence();
String typeId = decoder.decodeObjectIdentifier();
byte[] encodedValue = decoder.drainElement();
decoder.endSequence();
generalName = new OtherName(typeId, encodedValue);
break out;
}
break;
case RFC_822_NAME:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, false)) {
decoder.decodeImplicit(generalNameType);
generalName = new RFC822Name(decoder.decodeIA5String());
break out;
}
break;
case DNS_NAME:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, false)) {
decoder.decodeImplicit(generalNameType);
generalName = new DNSName(decoder.decodeIA5String());
break out;
}
break;
case X400_ADDRESS:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, true)) {
decoder.decodeImplicit(generalNameType);
generalName = new X400Address(decoder.drainElementValue(), true);
break out;
}
break;
case DIRECTORY_NAME:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, true)) {
byte[] encodedName = decoder.drainElementValue();
generalName = new DirectoryName((new X500Principal(encodedName)).getName(X500Principal.CANONICAL));
break out;
}
break;
case EDI_PARTY_NAME:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, true)) {
decoder.decodeImplicit(generalNameType);
generalName = new EDIPartyName(decoder.drainElementValue(), true);
break out;
}
break;
case URI_NAME:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, false)) {
decoder.decodeImplicit(generalNameType);
generalName = new URIName(decoder.decodeIA5String());
break out;
}
break;
case IP_ADDRESS:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, false)) {
decoder.decodeImplicit(generalNameType);
generalName = new IPAddress(decoder.decodeOctetString());
break out;
}
break;
case REGISTERED_ID:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, generalNameType, false)) {
decoder.decodeImplicit(generalNameType);
generalName = new RegisteredID(decoder.decodeObjectIdentifier());
break out;
}
break;
default: throw saslEntity.asnInvalidGeneralNameType();
}
}
}
generalNames.add(generalName);
}
decoder.endSequence();
return generalNames;
}
/**
* Decode the next element from the given DER decoder as an X.509 certificate chain.
*
* @param decoder the DER decoder
* @return the X.509 certificate chain
* @throws ASN1Exception if the next element from the given decoder is not an X.509
* certificate chain or if an error occurs while decoding the X.509 certificate chain
*/
public static X509Certificate[] decodeX509CertificateChain(final DERDecoder decoder) throws ASN1Exception {
if (decoder.peekType() != SET_TYPE) {
throw saslEntity.asnUnexpectedTag();
}
byte[] certChain = decoder.drainElement();
try {
CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
certChain[0] = SEQUENCE_TYPE; // CertificateFactory#generateCertPath requires a DER SEQUE
CertPath certPath = certFactory.generateCertPath(new ByteArrayInputStream(certChain));
List certs = certPath.getCertificates();
return certs.toArray(new X509Certificate[certs.size()]);
} catch (CertificateException e) {
throw new ASN1Exception(e);
}
}
/**
*
* Decode the next element from the given DER decoder as a {@code CertData} element,
* which is defined as follows:
*
*
* CertData ::= CHOICE {
* certificateSet SET SIZE (1..MAX) OF Certificate,
* certURL IA5String (Note: No support for certificate URL)
* }
*
*
*
* @param decoder the DER decoder
* @return the X.509 certificate or certificate chain
* @throws ASN1Exception if the next element from the given decoder is not a {@code CertData}
* element or if an error occurs while decoding the certificate data
*/
public static X509Certificate[] decodeCertificateData(final DERDecoder decoder) throws ASN1Exception {
X509Certificate[] peerCertChain;
if (decoder.peekType() == SET_TYPE) {
peerCertChain = decodeX509CertificateChain(decoder);
} else {
throw saslEntity.asnUnexpectedTag();
}
return peerCertChain;
}
/**
* Decode the next element from the given DER decoder as a trusted authorities element.
*
* @param decoder the DER decoder
* @return the trusted authorities
* @throws ASN1Exception if the next element from the given decoder is not a trusted authorities
* element or if an error occurs while decoding the trusted authorities element
*/
public static List decodeTrustedAuthorities(final DERDecoder decoder) throws ASN1Exception {
List trustedAuthorities = new ArrayList();
TrustedAuthority trustedAuthority = null;
decoder.startSequence();
while (decoder.hasNextElement()) {
out: {
for (int trustedAuthorityType = 0; trustedAuthorityType <= 4; trustedAuthorityType++) {
switch (trustedAuthorityType) {
case AUTHORITY_NAME:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, trustedAuthorityType, true)) {
byte[] encodedName = decoder.drainElementValue();
trustedAuthority = new NameTrustedAuthority((new X500Principal(encodedName)).getName(X500Principal.CANONICAL));
break out;
}
break;
case AUTHORITY_CERTIFICATE:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, trustedAuthorityType, true)) {
decoder.decodeImplicit(trustedAuthorityType);
byte[] cert = decoder.drainElement();
cert[0] = SEQUENCE_TYPE; // Replace the trusted authority type tag with a DER SEQUENCE tag, as required by CertificateFactory#generateCertificate
try {
CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
trustedAuthority = new CertificateTrustedAuthority((X509Certificate) certFactory.generateCertificate(new ByteArrayInputStream(cert)));
} catch (CertificateException e) {
throw new ASN1Exception(e);
}
break out;
}
break;
case ISSUER_NAME_HASH:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, trustedAuthorityType, false)) {
decoder.decodeImplicit(trustedAuthorityType);
trustedAuthority = new IssuerNameHashTrustedAuthority(decoder.decodeOctetString());
break out;
}
break;
case ISSUER_KEY_HASH:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, trustedAuthorityType, false)) {
decoder.decodeImplicit(trustedAuthorityType);
trustedAuthority = new IssuerKeyHashTrustedAuthority(decoder.decodeOctetString());
break out;
}
break;
case PKCS_15_KEY_HASH:
if (decoder.isNextType(CONTEXT_SPECIFIC_MASK, trustedAuthorityType, false)) {
decoder.decodeImplicit(trustedAuthorityType);
trustedAuthority = new PKCS15KeyHashTrustedAuthority(decoder.decodeOctetString());
break out;
}
break;
default: throw saslEntity.asnInvalidGeneralNameType();
}
}
}
trustedAuthorities.add(trustedAuthority);
}
decoder.endSequence();
return trustedAuthorities;
}
public static boolean matchGeneralNames(List generalNames,
List actualGeneralNames) {
if ((generalNames == null) || (actualGeneralNames == null)) {
return false;
}
for (GeneralName generalName : generalNames) {
for (GeneralName actualGeneralName : actualGeneralNames) {
if (matchGeneralName(generalName, actualGeneralName)) {
return true;
}
}
}
return false;
}
public static boolean matchGeneralName(GeneralName generalName, GeneralName actualGeneralName) {
if ((generalName instanceof DNSName) && (actualGeneralName instanceof DirectoryName)) {
// Check if the DNSName matches the DirectoryName's (most specific) Common Name field.
// Although specifying a DNS name using the Common Name field has been deprecated, it is
// still used in practice (e.g., see http://tools.ietf.org/html/rfc2818).
String[] cnValues = X500PrincipalUtil.getAttributeValues(new X500Principal(((DirectoryName) actualGeneralName).getName()), X500.OID_AT_COMMON_NAME);
String dnsName = ((DNSName) generalName).getName();
return dnsName.equalsIgnoreCase(cnValues[0]);
} else {
return generalName.equals(actualGeneralName);
}
}
public static boolean matchGeneralNames(List generalNames, X509Certificate cert) {
X500Principal certSubjectName = cert.getSubjectX500Principal();
try {
if (matchGeneralNames(generalNames, convertToGeneralNames(cert.getSubjectAlternativeNames()))) {
return true;
}
} catch (CertificateParsingException e) {
// Ignore unless the subject name is empty
if (certSubjectName == null) {
throw saslEntity.unableToDetermineSubjectName(e);
}
}
List certNames;
if (certSubjectName != null) {
certNames = new ArrayList(1);
certNames.add(new DirectoryName(certSubjectName.getName(X500Principal.CANONICAL)));
if (matchGeneralNames(generalNames, certNames)) {
return true;
}
}
return false;
}
public static String getDistinguishedNameFromGeneralNames(List generalNames) {
for (GeneralName generalName : generalNames) {
if (generalName instanceof DirectoryName) {
return ((DirectoryName) generalName).getName();
}
}
return null;
}
private static GeneralName convertToGeneralName(List generalName) throws ASN1Exception {
int type = ((Integer) generalName.get(0)).intValue();
Object name = generalName.get(1);
switch (type) {
case OTHER_NAME:
return new OtherName((byte[]) name);
case RFC_822_NAME:
return new RFC822Name((String) name);
case DNS_NAME:
return new DNSName((String) name);
case X400_ADDRESS:
return new X400Address((byte[]) name);
case DIRECTORY_NAME:
return new DirectoryName((String) name);
case EDI_PARTY_NAME:
return new EDIPartyName((byte[]) name);
case URI_NAME:
return new URIName((String) name);
case IP_ADDRESS:
return new IPAddress((String) name);
case REGISTERED_ID:
return new RegisteredID((String) name);
default: throw saslEntity.asnInvalidGeneralNameType();
}
}
private static List convertToGeneralNames(Collection> generalNames) throws ASN1Exception {
if (generalNames == null) {
return null;
}
List convertedGeneralNames = new ArrayList();
for (List generalName : generalNames) {
convertedGeneralNames.add(convertToGeneralName(generalName));
}
return convertedGeneralNames;
}
}