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OAuth 2.0 SDK with OpenID Connection extensions for developing client
and server applications.
/*
* oauth2-oidc-sdk
*
* Copyright 2012-2016, Connect2id Ltd and contributors.
*
* 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.nimbusds.oauth2.sdk.auth.verifier;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import net.jcip.annotations.ThreadSafe;
import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JWSVerifier;
import com.nimbusds.jose.crypto.MACVerifier;
import com.nimbusds.jose.crypto.factories.DefaultJWSVerifierFactory;
import com.nimbusds.jose.proc.JWSVerifierFactory;
import com.nimbusds.jwt.SignedJWT;
import com.nimbusds.jwt.proc.BadJWTException;
import com.nimbusds.oauth2.sdk.auth.*;
import com.nimbusds.oauth2.sdk.id.Audience;
import com.nimbusds.oauth2.sdk.util.CollectionUtils;
import com.nimbusds.oauth2.sdk.util.ListUtils;
import com.nimbusds.oauth2.sdk.util.X509CertificateUtils;
/**
* Client authentication verifier.
*
* Related specifications:
*
*
* - OAuth 2.0 (RFC 6749), sections 2.3.1 and 3.2.1.
*
- OpenID Connect Core 1.0, section 9.
*
- JSON Web Token (JWT) Profile for OAuth 2.0 Client Authentication and
* Authorization Grants (RFC 7523).
*
- OAuth 2.0 Mutual TLS Client Authentication and Certificate Bound
* Access Tokens (RFC 8705), section 2.
*
*/
@ThreadSafe
public class ClientAuthenticationVerifier {
/**
* The client credentials selector.
*/
private final ClientCredentialsSelector clientCredentialsSelector;
/**
* Optional client X.509 certificate binding verifier for
* {@code tls_client_auth}.
* @deprecated Replaced by pkiCertBindingVerifier
*/
@Deprecated
private final ClientX509CertificateBindingVerifier certBindingVerifier;
/**
* Optional client X.509 certificate binding verifier for
* {@code tls_client_auth}.
*/
private final PKIClientX509CertificateBindingVerifier pkiCertBindingVerifier;
/**
* The JWT assertion claims set verifier.
*/
private final JWTAuthenticationClaimsSetVerifier claimsSetVerifier;
/**
* JWS verifier factory for private_key_jwt authentication.
*/
private final JWSVerifierFactory jwsVerifierFactory = new DefaultJWSVerifierFactory();
/**
* Creates a new client authentication verifier.
*
* @param clientCredentialsSelector The client credentials selector.
* Must not be {@code null}.
* @param certBindingVerifier Optional client X.509 certificate
* binding verifier for
* {@code tls_client_auth},
* {@code null} if not supported.
* @param expectedAudience The permitted audience (aud) claim
* values in JWT authentication
* assertions. Must not be empty or
* {@code null}. Should typically
* contain the token endpoint URI and
* for OpenID provider it may also
* include the issuer URI.
* @deprecated Use the constructor with {@link PKIClientX509CertificateBindingVerifier}
*/
@Deprecated
public ClientAuthenticationVerifier(final ClientCredentialsSelector clientCredentialsSelector,
final ClientX509CertificateBindingVerifier certBindingVerifier,
final Set expectedAudience) {
claimsSetVerifier = new JWTAuthenticationClaimsSetVerifier(expectedAudience);
if (clientCredentialsSelector == null) {
throw new IllegalArgumentException("The client credentials selector must not be null");
}
this.certBindingVerifier = certBindingVerifier;
this.pkiCertBindingVerifier = null;
this.clientCredentialsSelector = clientCredentialsSelector;
}
/**
* Creates a new client authentication verifier without support for
* {@code tls_client_auth}.
*
* @param clientCredentialsSelector The client credentials selector.
* Must not be {@code null}.
* @param expectedAudience The permitted audience (aud) claim
* values in JWT authentication
* assertions. Must not be empty or
* {@code null}. Should typically
* contain the token endpoint URI and
* for OpenID provider it may also
* include the issuer URI.
*/
public ClientAuthenticationVerifier(final ClientCredentialsSelector clientCredentialsSelector,
final Set expectedAudience) {
claimsSetVerifier = new JWTAuthenticationClaimsSetVerifier(expectedAudience);
if (clientCredentialsSelector == null) {
throw new IllegalArgumentException("The client credentials selector must not be null");
}
this.certBindingVerifier = null;
this.pkiCertBindingVerifier = null;
this.clientCredentialsSelector = clientCredentialsSelector;
}
/**
* Creates a new client authentication verifier.
*
* @param clientCredentialsSelector The client credentials selector.
* Must not be {@code null}.
* @param pkiCertBindingVerifier Optional client X.509 certificate
* binding verifier for
* {@code tls_client_auth},
* {@code null} if not supported.
* @param expectedAudience The permitted audience (aud) claim
* values in JWT authentication
* assertions. Must not be empty or
* {@code null}. Should typically
* contain the token endpoint URI and
* for OpenID provider it may also
* include the issuer URI.
*/
public ClientAuthenticationVerifier(final ClientCredentialsSelector clientCredentialsSelector,
final PKIClientX509CertificateBindingVerifier pkiCertBindingVerifier,
final Set expectedAudience) {
claimsSetVerifier = new JWTAuthenticationClaimsSetVerifier(expectedAudience);
if (clientCredentialsSelector == null) {
throw new IllegalArgumentException("The client credentials selector must not be null");
}
this.certBindingVerifier = null;
this.pkiCertBindingVerifier = pkiCertBindingVerifier;
this.clientCredentialsSelector = clientCredentialsSelector;
}
/**
* Returns the client credentials selector.
*
* @return The client credentials selector.
*/
public ClientCredentialsSelector getClientCredentialsSelector() {
return clientCredentialsSelector;
}
/**
* Returns the client X.509 certificate binding verifier for use in
* {@code tls_client_auth}.
*
* @return The client X.509 certificate binding verifier, {@code null}
* if not specified.
* @deprecated See {@link PKIClientX509CertificateBindingVerifier}
*/
@Deprecated
public ClientX509CertificateBindingVerifier getClientX509CertificateBindingVerifier() {
return certBindingVerifier;
}
/**
* Returns the client X.509 certificate binding verifier for use in
* {@code tls_client_auth}.
*
* @return The client X.509 certificate binding verifier, {@code null}
* if not specified.
*/
public PKIClientX509CertificateBindingVerifier getPKIClientX509CertificateBindingVerifier() {
return pkiCertBindingVerifier;
}
/**
* Returns the permitted audience values in JWT authentication
* assertions.
*
* @return The permitted audience (aud) claim values.
*/
public Set getExpectedAudience() {
return claimsSetVerifier.getExpectedAudience();
}
private static List removeNullOrErased(final List secrets) {
List allSet = ListUtils.removeNullItems(secrets);
if (allSet == null) {
return null;
}
List out = new LinkedList<>();
for (Secret secret: secrets) {
if (secret.getValue() != null && secret.getValueBytes() != null) {
out.add(secret);
}
}
return out;
}
/**
* Verifies a client authentication request.
*
* @param clientAuth The client authentication. Must not be
* {@code null}.
* @param hints Optional hints to the verifier, empty set of
* {@code null} if none.
* @param context Additional context to be passed to the client
* credentials selector. May be {@code null}.
*
* @throws InvalidClientException If the client authentication is
* invalid, typically due to bad
* credentials.
* @throws JOSEException If authentication failed due to an
* internal JOSE / JWT processing
* exception.
*/
public void verify(final ClientAuthentication clientAuth, final Set hints, final Context context)
throws InvalidClientException, JOSEException {
if (clientAuth instanceof PlainClientSecret) {
List secretCandidates = ListUtils.removeNullItems(
clientCredentialsSelector.selectClientSecrets(
clientAuth.getClientID(),
clientAuth.getMethod(),
context
)
);
if (CollectionUtils.isEmpty(secretCandidates)) {
throw InvalidClientException.NO_REGISTERED_SECRET;
}
PlainClientSecret plainAuth = (PlainClientSecret)clientAuth;
for (Secret candidate: secretCandidates) {
// Constant time, SHA-256 based, unless overridden
if (candidate.equals(plainAuth.getClientSecret())) {
return; // success
}
}
throw InvalidClientException.BAD_SECRET;
} else if (clientAuth instanceof ClientSecretJWT) {
ClientSecretJWT jwtAuth = (ClientSecretJWT) clientAuth;
// Check claims first before requesting secret from backend
try {
claimsSetVerifier.verify(jwtAuth.getJWTAuthenticationClaimsSet().toJWTClaimsSet(), null);
} catch (BadJWTException e) {
throw new InvalidClientException("Bad / expired JWT claims: " + e.getMessage());
}
List secretCandidates = removeNullOrErased(
clientCredentialsSelector.selectClientSecrets(
clientAuth.getClientID(),
clientAuth.getMethod(),
context
)
);
if (CollectionUtils.isEmpty(secretCandidates)) {
throw InvalidClientException.NO_REGISTERED_SECRET;
}
SignedJWT assertion = jwtAuth.getClientAssertion();
for (Secret candidate : secretCandidates) {
boolean valid = assertion.verify(new MACVerifier(candidate.getValueBytes()));
if (valid) {
return; // success
}
}
throw InvalidClientException.BAD_JWT_HMAC;
} else if (clientAuth instanceof PrivateKeyJWT) {
PrivateKeyJWT jwtAuth = (PrivateKeyJWT) clientAuth;
// Check claims first before requesting / retrieving public keys
try {
claimsSetVerifier.verify(jwtAuth.getJWTAuthenticationClaimsSet().toJWTClaimsSet(), null);
} catch (BadJWTException e) {
throw new InvalidClientException("Bad / expired JWT claims: " + e.getMessage());
}
List keyCandidates = ListUtils.removeNullItems(
clientCredentialsSelector.selectPublicKeys(
jwtAuth.getClientID(),
jwtAuth.getMethod(),
jwtAuth.getClientAssertion().getHeader(),
false, // don't force refresh if we have a remote JWK set;
// selector may however do so if it encounters an unknown key ID
context
)
);
if (CollectionUtils.isEmpty(keyCandidates)) {
throw InvalidClientException.NO_MATCHING_JWK;
}
SignedJWT assertion = jwtAuth.getClientAssertion();
for (PublicKey candidate : keyCandidates) {
JWSVerifier jwsVerifier = jwsVerifierFactory.createJWSVerifier(
jwtAuth.getClientAssertion().getHeader(),
candidate);
boolean valid = assertion.verify(jwsVerifier);
if (valid) {
return; // success
}
}
// Second pass
if (hints != null && hints.contains(Hint.CLIENT_HAS_REMOTE_JWK_SET)) {
// Client possibly registered JWK set URL with keys that have no IDs
// force JWK set reload from URL and retry
keyCandidates = ListUtils.removeNullItems(
clientCredentialsSelector.selectPublicKeys(
jwtAuth.getClientID(),
jwtAuth.getMethod(),
jwtAuth.getClientAssertion().getHeader(),
true, // force reload of remote JWK set
context
)
);
if (CollectionUtils.isEmpty(keyCandidates)) {
throw InvalidClientException.NO_MATCHING_JWK;
}
assertion = jwtAuth.getClientAssertion();
for (PublicKey candidate : keyCandidates) {
JWSVerifier jwsVerifier = jwsVerifierFactory.createJWSVerifier(
jwtAuth.getClientAssertion().getHeader(),
candidate);
boolean valid = assertion.verify(jwsVerifier);
if (valid) {
return; // success
}
}
}
throw InvalidClientException.BAD_JWT_SIGNATURE;
} else if (clientAuth instanceof SelfSignedTLSClientAuthentication) {
SelfSignedTLSClientAuthentication tlsClientAuth = (SelfSignedTLSClientAuthentication) clientAuth;
X509Certificate clientCert = tlsClientAuth.getClientX509Certificate();
if (clientCert == null) {
// Sanity check
throw new InvalidClientException("Missing client X.509 certificate");
}
// Self-signed certs bound to registered public key in client jwks / jwks_uri
List keyCandidates = ListUtils.removeNullItems(
clientCredentialsSelector.selectPublicKeys(
tlsClientAuth.getClientID(),
tlsClientAuth.getMethod(),
null,
false, // don't force refresh if we have a remote JWK set;
// selector may however do so if it encounters an unknown key ID
context
)
);
if (CollectionUtils.isEmpty(keyCandidates)) {
throw InvalidClientException.NO_MATCHING_JWK;
}
for (PublicKey candidate : keyCandidates) {
boolean valid = X509CertificateUtils.publicKeyMatches(clientCert, candidate);
if (valid) {
return; // success
}
}
// Second pass
if (hints != null && hints.contains(Hint.CLIENT_HAS_REMOTE_JWK_SET)) {
// Client possibly registered JWK set URL with keys that have no IDs
// force JWK set reload from URL and retry
keyCandidates = ListUtils.removeNullItems(
clientCredentialsSelector.selectPublicKeys(
tlsClientAuth.getClientID(),
tlsClientAuth.getMethod(),
null,
true, // force reload of remote JWK set
context
)
);
if (CollectionUtils.isEmpty(keyCandidates)) {
throw InvalidClientException.NO_MATCHING_JWK;
}
for (PublicKey candidate : keyCandidates) {
if (candidate == null) {
continue; // skip
}
boolean valid = X509CertificateUtils.publicKeyMatches(clientCert, candidate);
if (valid) {
return; // success
}
}
}
throw InvalidClientException.BAD_SELF_SIGNED_CLIENT_CERTIFICATE;
} else if (clientAuth instanceof PKITLSClientAuthentication) {
PKITLSClientAuthentication tlsClientAuth = (PKITLSClientAuthentication) clientAuth;
if (pkiCertBindingVerifier != null) {
pkiCertBindingVerifier.verifyCertificateBinding(
clientAuth.getClientID(),
tlsClientAuth.getClientX509Certificate(),
context);
} else if (certBindingVerifier != null) {
certBindingVerifier.verifyCertificateBinding(
clientAuth.getClientID(),
tlsClientAuth.getClientX509CertificateSubjectDN(),
context);
} else {
throw new InvalidClientException("Mutual TLS client Authentication (tls_client_auth) not supported");
}
} else {
throw new RuntimeException("Unexpected client authentication: " + clientAuth.getMethod());
}
}
}