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WildFly Security HTTP OIDC Mechanism Implementation
/*
* JBoss, Home of Professional Open Source.
* Copyright 2021 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.http.oidc;
import static org.wildfly.security.http.oidc.ElytronMessages.log;
import static org.wildfly.security.http.oidc.IDToken.AT_HASH;
import static org.wildfly.security.http.oidc.Oidc.INVALID_AT_HASH_CLAIM;
import static org.wildfly.security.http.oidc.Oidc.INVALID_ISSUED_FOR_CLAIM;
import static org.wildfly.security.http.oidc.Oidc.INVALID_TYPE_CLAIM;
import static org.wildfly.security.http.oidc.Oidc.getJavaAlgorithmForHash;
import static org.wildfly.security.jose.jwk.JWKUtil.BASE64_URL;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import javax.crypto.SecretKey;
import org.jose4j.jwa.AlgorithmConstraints;
import org.jose4j.jwt.JwtClaims;
import org.jose4j.jwt.MalformedClaimException;
import org.jose4j.jwt.consumer.ErrorCodeValidator;
import org.jose4j.jwt.consumer.InvalidJwtException;
import org.jose4j.jwt.consumer.JwtConsumer;
import org.jose4j.jwt.consumer.JwtConsumerBuilder;
import org.jose4j.jwt.consumer.JwtContext;
import org.wildfly.common.Assert;
import org.wildfly.common.iteration.ByteIterator;
/**
* Validator for an ID token or bearer token, as per OpenID Connect Core 1.0
* and RFC 7523.
*
* @author Farah Juma
*/
public class TokenValidator {
private static final int HEADER_INDEX = 0;
private JwtConsumerBuilder jwtConsumerBuilder;
private OidcClientConfiguration clientConfiguration;
private TokenValidator(Builder builder) {
this.jwtConsumerBuilder = builder.jwtConsumerBuilder;
this.clientConfiguration = builder.clientConfiguration;
}
/**
* Parse and verify the given ID token.
*
* @param idToken the ID token
* @return the {@code VerifiedTokens} if the ID token was valid
* @throws OidcException if the ID token is invalid
*/
public VerifiedTokens parseAndVerifyToken(final String idToken, final String accessToken) throws OidcException {
try {
JwtContext idJwtContext = setVerificationKey(idToken, jwtConsumerBuilder);
jwtConsumerBuilder.setExpectedAudience(clientConfiguration.getResourceName());
jwtConsumerBuilder.registerValidator(new AzpValidator(clientConfiguration.getResourceName()));
jwtConsumerBuilder.registerValidator(new AtHashValidator(accessToken, clientConfiguration.getTokenSignatureAlgorithm()));
// second pass to validate
jwtConsumerBuilder.build().processContext(idJwtContext);
JwtClaims idJwtClaims = idJwtContext.getJwtClaims();
if (idJwtClaims == null) {
throw log.invalidIDTokenClaims();
}
JwtClaims jwtClaims = new JwtConsumerBuilder().setSkipSignatureVerification().setSkipAllValidators().build().processToClaims(accessToken);
return new VerifiedTokens(new IDToken(idJwtClaims), new AccessToken(jwtClaims));
} catch (InvalidJwtException e) {
log.tracef("Problem parsing ID token: " + idToken, e);
throw log.invalidIDToken(e);
}
}
/**
* Parse and verify the given bearer token.
*
* @param bearerToken the bearer token
* @return the {@code AccessToken} if the bearer token was valid
* @throws OidcException if the bearer token is invalid
*/
public AccessToken parseAndVerifyToken(final String bearerToken) throws OidcException {
try {
JwtContext jwtContext = setVerificationKey(bearerToken, jwtConsumerBuilder);
jwtConsumerBuilder.setRequireSubject();
jwtConsumerBuilder.registerValidator(new TypeValidator("Bearer"));
if (clientConfiguration.isVerifyTokenAudience()) {
jwtConsumerBuilder.setExpectedAudience(clientConfiguration.getResourceName());
} else {
jwtConsumerBuilder.setSkipDefaultAudienceValidation();
}
// second pass to validate
jwtConsumerBuilder.build().processContext(jwtContext);
JwtClaims jwtClaims = jwtContext.getJwtClaims();
if (jwtClaims == null) {
throw log.invalidBearerTokenClaims();
}
return new AccessToken(jwtClaims);
} catch (InvalidJwtException e) {
log.tracef("Problem parsing bearer token: " + bearerToken, e);
throw log.invalidBearerToken(e);
}
}
private JwtContext setVerificationKey(final String token, final JwtConsumerBuilder jwtConsumerBuilder) throws InvalidJwtException {
// first pass to determine the kid, if present
JwtConsumer firstPassJwtConsumer = new JwtConsumerBuilder()
.setSkipAllValidators()
.setDisableRequireSignature()
.setSkipSignatureVerification()
.build();
JwtContext jwtContext = firstPassJwtConsumer.process(token);
String kid = jwtContext.getJoseObjects().get(HEADER_INDEX).getKeyIdHeaderValue();
if (kid != null && clientConfiguration.getPublicKeyLocator() != null) {
jwtConsumerBuilder.setVerificationKey(clientConfiguration.getPublicKeyLocator().getPublicKey(kid, clientConfiguration));
} else {
// secret key
ClientSecretCredentialsProvider clientSecretCredentialsProvider = (ClientSecretCredentialsProvider) clientConfiguration.getClientAuthenticator();
jwtConsumerBuilder.setVerificationKey(clientSecretCredentialsProvider.getClientSecret());
}
return jwtContext;
}
/**
* Construct a new builder instance.
*
* @param clientConfiguration the OIDC client configuration
* @return the new builder instance
*/
public static Builder builder(OidcClientConfiguration clientConfiguration) {
return new Builder(clientConfiguration);
}
public static class Builder {
private OidcClientConfiguration clientConfiguration;
private String expectedIssuer;
private String clientId;
private String expectedJwsAlgorithm;
private PublicKeyLocator publicKeyLocator;
private SecretKey clientSecretKey;
private JwtConsumerBuilder jwtConsumerBuilder;
/**
* Construct a new uninitialized instance.
*
* @param clientConfiguration the OIDC client configuration
*/
Builder(OidcClientConfiguration clientConfiguration) {
Assert.checkNotNullParam("clientConfiguration", clientConfiguration);
this.clientConfiguration = clientConfiguration;
}
/**
* Create an ID token or bearer token validator.
*
* @return the newly created token validator
* @throws IllegalArgumentException if a required builder parameter is missing or invalid
*/
public TokenValidator build() throws IllegalArgumentException {
expectedIssuer = clientConfiguration.getIssuerUrl();
if (expectedIssuer == null || expectedIssuer.length() == 0) {
throw log.noExpectedIssuerGiven();
}
clientId = clientConfiguration.getResourceName();
if (clientId == null || clientId.length() == 0) {
throw log.noClientIDGiven();
}
expectedJwsAlgorithm = clientConfiguration.getTokenSignatureAlgorithm();
if (expectedJwsAlgorithm == null || expectedJwsAlgorithm.length() == 0) {
throw log.noExpectedJwsAlgorithmGiven();
}
publicKeyLocator = clientConfiguration.getPublicKeyLocator();
if (clientConfiguration.getClientAuthenticator() instanceof ClientSecretCredentialsProvider) {
ClientSecretCredentialsProvider clientSecretCredentialsProvider = (ClientSecretCredentialsProvider) clientConfiguration.getClientAuthenticator();
clientSecretKey = clientSecretCredentialsProvider.getClientSecret();
}
if (publicKeyLocator == null && clientSecretKey == null) {
throw log.noJwksPublicKeyOrClientSecretKeyGiven();
}
jwtConsumerBuilder = new JwtConsumerBuilder()
.setExpectedIssuer(expectedIssuer)
.setJwsAlgorithmConstraints(
new AlgorithmConstraints(AlgorithmConstraints.ConstraintType.PERMIT, expectedJwsAlgorithm))
.setRequireExpirationTime();
return new TokenValidator(this);
}
}
private static class AzpValidator implements ErrorCodeValidator {
public static final String AZP = "azp";
private final String issuedFor;
public AzpValidator(String issuedFor) {
this.issuedFor = issuedFor;
}
public ErrorCodeValidator.Error validate(JwtContext jwtContext) throws MalformedClaimException {
JwtClaims jwtClaims = jwtContext.getJwtClaims();
boolean valid = false;
if (jwtClaims.getAudience().size() > 1) {
// if the ID token contains multiple audiences, then verify that an azp claim is present
if (jwtClaims.hasClaim(AZP)) {
String azpValue = jwtClaims.getStringClaimValue(AZP);
valid = azpValue != null && jwtClaims.getClaimValueAsString(AZP).equals(issuedFor);
}
} else {
valid = true; // one audience
}
if (! valid) {
return new ErrorCodeValidator.Error(INVALID_ISSUED_FOR_CLAIM, log.unexpectedValueForIssuedForClaim());
}
return null;
}
}
private static class AtHashValidator implements ErrorCodeValidator {
private final String accessTokenString;
private final String jwsAlgorithm;
public AtHashValidator(String accessTokenString, String jwsAlgorithm) {
this.accessTokenString = accessTokenString;
this.jwsAlgorithm = jwsAlgorithm;
}
public ErrorCodeValidator.Error validate(JwtContext jwtContext) throws MalformedClaimException {
JwtClaims jwtClaims = jwtContext.getJwtClaims();
boolean valid = true;
if (jwtClaims.hasClaim(AT_HASH)) {
String atHash = jwtClaims.getStringClaimValue(AT_HASH);
String actualHash;
try {
actualHash = getAccessTokenHash(accessTokenString, jwsAlgorithm);
valid = atHash.equals(actualHash);
} catch (Exception e) {
valid = false;
}
}
if (! valid) {
return new ErrorCodeValidator.Error(INVALID_AT_HASH_CLAIM, log.unexpectedValueForAtHashClaim());
}
return null;
}
}
private static class TypeValidator implements ErrorCodeValidator {
public static final String TYPE = "typ";
private final String expectedType;
public TypeValidator(String expectedType) {
this.expectedType = expectedType;
}
public ErrorCodeValidator.Error validate(JwtContext jwtContext) throws MalformedClaimException {
JwtClaims jwtClaims = jwtContext.getJwtClaims();
boolean valid = false;
if (jwtClaims.hasClaim(TYPE)) {
valid = jwtClaims.getStringClaimValue(TYPE).equals(expectedType);
}
if (! valid) {
return new ErrorCodeValidator.Error(INVALID_TYPE_CLAIM, log.unexpectedValueForTypeClaim());
}
return null;
}
}
private static String getAccessTokenHash(String accessTokenString, String jwsAlgorithm) throws NoSuchAlgorithmException {
byte[] inputBytes = accessTokenString.getBytes(StandardCharsets.UTF_8);
String javaAlgName = getJavaAlgorithmForHash(jwsAlgorithm);
MessageDigest md = MessageDigest.getInstance(javaAlgName);
md.update(inputBytes);
byte[] hash = md.digest();
int hashLength = hash.length / 2;
byte[] hashInput = Arrays.copyOf(hash, hashLength); // leftmost half of the hash
return ByteIterator.ofBytes(hashInput).base64Encode(BASE64_URL, false).drainToString();
}
public static class VerifiedTokens {
private final AccessToken accessToken;
private final IDToken idToken;
public VerifiedTokens(final IDToken idToken, final AccessToken accessToken) {
this.idToken = idToken;
this.accessToken = accessToken;
}
public AccessToken getAccessToken() {
return accessToken;
}
public IDToken getIdToken() {
return idToken;
}
}
}