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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.jarm;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.ParseException;
import com.nimbusds.jose.*;
import com.nimbusds.jose.jwk.JWKSet;
import com.nimbusds.jose.jwk.source.ImmutableJWKSet;
import com.nimbusds.jose.jwk.source.ImmutableSecret;
import com.nimbusds.jose.jwk.source.JWKSource;
import com.nimbusds.jose.jwk.source.RemoteJWKSet;
import com.nimbusds.jose.proc.*;
import com.nimbusds.jose.util.ResourceRetriever;
import com.nimbusds.jwt.*;
import com.nimbusds.jwt.proc.BadJWTException;
import com.nimbusds.jwt.proc.ClockSkewAware;
import com.nimbusds.jwt.proc.ConfigurableJWTProcessor;
import com.nimbusds.jwt.proc.DefaultJWTProcessor;
import com.nimbusds.oauth2.sdk.GeneralException;
import com.nimbusds.oauth2.sdk.as.AuthorizationServerMetadata;
import com.nimbusds.oauth2.sdk.auth.Secret;
import com.nimbusds.oauth2.sdk.client.ClientInformation;
import com.nimbusds.oauth2.sdk.id.ClientID;
import com.nimbusds.oauth2.sdk.id.Issuer;
import com.nimbusds.openid.connect.sdk.op.OIDCProviderMetadata;
import com.nimbusds.openid.connect.sdk.validators.AbstractJWTValidator;
import net.jcip.annotations.ThreadSafe;
/**
* Validator of JSON Web Token (JWT) secured authorisation responses (JARM).
*
* Supports processing of JWT responses with the following protection:
*
*
* - JWTs signed (JWS) with the Authorisation Server's RSA or EC key,
* require the Authorisation Server's public JWK set (provided by value
* or URL) to verify them.
*
- JWTs authenticated with a JWS HMAC, require the client's secret
* to verify them.
*
*
* Convenience static methods for creating a validator from Authorisation
* Server metadata or issuer URL, and the registered OAuth 2.0 client
* information:
*
*
* - {@link #create(AuthorizationServerMetadata, ClientInformation)}
*
- {@link #create(Issuer, ClientInformation)}
*
*
* Related specifications:
*
*
* - Financial-grade API: JWT Secured Authorization Response Mode for
* OAuth 2.0 (JARM).
*
*/
@ThreadSafe
public class JARMValidator extends AbstractJWTValidator implements ClockSkewAware {
/**
* Creates a new JARM validator for RSA or EC signed authorisation
* responses where the Authorisation Server's JWK set is specified by
* value.
*
* @param expectedIssuer The expected issuer (Authorisation Server).
* Must not be {@code null}.
* @param clientID The client ID. Must not be {@code null}.
* @param expectedJWSAlg The expected RSA or EC JWS algorithm. Must not
* be {@code null}.
* @param jwkSet The Authorisation Server JWK set. Must not be
* {@code null}.
*/
public JARMValidator(final Issuer expectedIssuer,
final ClientID clientID,
final JWSAlgorithm expectedJWSAlg,
final JWKSet jwkSet) {
this(expectedIssuer, clientID, new JWSVerificationKeySelector(expectedJWSAlg, new ImmutableJWKSet(jwkSet)), null);
}
/**
* Creates a new JARM validator for RSA or EC signed authorisation
* responses where the Authorisation Server's JWK set is specified by
* URL.
*
* @param expectedIssuer The expected issuer (Authorisation Server).
* Must not be {@code null}.
* @param clientID The client ID. Must not be {@code null}.
* @param expectedJWSAlg The expected RSA or EC JWS algorithm. Must not
* be {@code null}.
* @param jwkSetURI The OpenID Provider JWK set URL. Must not be
* {@code null}.
*/
public JARMValidator(final Issuer expectedIssuer,
final ClientID clientID,
final JWSAlgorithm expectedJWSAlg,
final URL jwkSetURI) {
this(expectedIssuer, clientID, expectedJWSAlg, jwkSetURI, null);
}
/**
* Creates a new JARM validator for RSA or EC signed authorisation
* responses where the Authorisation Server's JWK set is specified by
* URL. Permits setting of a specific resource retriever (HTTP client)
* for the JWK set.
*
* @param expectedIssuer The expected issuer (Authorisation Server).
* Must not be {@code null}.
* @param clientID The client ID. Must not be {@code null}.
* @param expectedJWSAlg The expected RSA or EC JWS algorithm. Must
* not be {@code null}.
* @param jwkSetURI The Authorisation Server JWK set URL. Must
* not be {@code null}.
* @param resourceRetriever For retrieving the Authorisation Server JWK
* from the specified URL. If {@code null} the
* {@link com.nimbusds.jose.util.DefaultResourceRetriever
* default retriever} will be used, with
* preset HTTP connect timeout, HTTP read
* timeout and entity size limit.
*/
public JARMValidator(final Issuer expectedIssuer,
final ClientID clientID,
final JWSAlgorithm expectedJWSAlg,
final URL jwkSetURI,
final ResourceRetriever resourceRetriever) {
this(expectedIssuer, clientID, new JWSVerificationKeySelector(expectedJWSAlg, new RemoteJWKSet(jwkSetURI, resourceRetriever)), null);
}
/**
* Creates a new JARM validator for HMAC protected authorisation
* responses.
*
* @param expectedIssuer The expected issuer (Authorisation Server).
* Must not be {@code null}.
* @param clientID The client ID. Must not be {@code null}.
* @param expectedJWSAlg The expected HMAC JWS algorithm. Must not be
* {@code null}.
* @param clientSecret The client secret. Must not be {@code null}.
*/
public JARMValidator(final Issuer expectedIssuer,
final ClientID clientID,
final JWSAlgorithm expectedJWSAlg,
final Secret clientSecret) {
this(expectedIssuer, clientID, new JWSVerificationKeySelector(expectedJWSAlg, new ImmutableSecret(clientSecret.getValueBytes())), null);
}
/**
* Creates a new JARM validator.
*
* @param expectedIssuer The expected issuer (Authorisation Server).
* Must not be {@code null}.
* @param clientID The client ID. Must not be {@code null}.
* @param jwsKeySelector The key selector for JWS verification, must
* not be {@code null}.
* @param jweKeySelector The key selector for JWE decryption,
* {@code null} if encrypted authorisation
* responses are not expected.
*/
public JARMValidator(final Issuer expectedIssuer,
final ClientID clientID,
final JWSKeySelector jwsKeySelector,
final JWEKeySelector jweKeySelector) {
super(expectedIssuer, clientID, jwsKeySelector, jweKeySelector);
}
/**
* Validates the specified JWT-secured authorisation response.
*
* @param jwtResponseString The JWT-secured authorisation response
* string. Must not be {@code null}.
*
* @return The claims set of the verified JWT.
*
* @throws BadJOSEException If the JWT is invalid or expired.
* @throws JOSEException If an internal JOSE exception was
* encountered.
*/
public JWTClaimsSet validate(final String jwtResponseString)
throws BadJOSEException, JOSEException {
try {
return validate(JWTParser.parse(jwtResponseString));
} catch (ParseException e) {
throw new BadJOSEException("Invalid JWT: " + e.getMessage(), e);
}
}
/**
* Validates the specified JWT-secured authorisation response.
*
* @param jwtResponse The JWT-secured authorisation response. Must not
* be {@code null}.
*
* @return The claims set of the verified JWT.
*
* @throws BadJOSEException If the JWT is invalid or expired.
* @throws JOSEException If an internal JOSE exception was
* encountered.
*/
public JWTClaimsSet validate(final JWT jwtResponse)
throws BadJOSEException, JOSEException {
if (jwtResponse instanceof SignedJWT) {
return validate((SignedJWT) jwtResponse);
} else if (jwtResponse instanceof EncryptedJWT) {
return validate((EncryptedJWT) jwtResponse);
} else if (jwtResponse instanceof PlainJWT) {
throw new BadJWTException("The JWT must not be plain (unsecured)");
} else {
throw new BadJOSEException("Unexpected JWT type: " + jwtResponse.getClass());
}
}
/**
* Verifies the specified signed authorisation response.
*
* @param jwtResponse The JWT-secured authorisation response. Must not
* be {@code null}.
*
* @return The claims set of the verified JWT.
*
* @throws BadJOSEException If the JWT is invalid or expired.
* @throws JOSEException If an internal JOSE exception was
* encountered.
*/
private JWTClaimsSet validate(final SignedJWT jwtResponse)
throws BadJOSEException, JOSEException {
if (getJWSKeySelector() == null) {
throw new BadJWTException("Verification of signed JWTs not configured");
}
ConfigurableJWTProcessor jwtProcessor = new DefaultJWTProcessor();
jwtProcessor.setJWSKeySelector(getJWSKeySelector());
jwtProcessor.setJWTClaimsSetVerifier(new JARMClaimsVerifier(getExpectedIssuer(), getClientID(), getMaxClockSkew()));
return jwtProcessor.process(jwtResponse, null);
}
/**
* Verifies the specified signed and encrypted authorisation response.
*
* @param jwtResponse The JWT-secured authorisation response. Must not
* be {@code null}.
*
* @return The claims set of the verified JWT.
*
* @throws BadJOSEException If the JWT is invalid or expired.
* @throws JOSEException If an internal JOSE exception was
* encountered.
*/
private JWTClaimsSet validate(final EncryptedJWT jwtResponse)
throws BadJOSEException, JOSEException {
if (getJWEKeySelector() == null) {
throw new BadJWTException("Decryption of JWTs not configured");
}
if (getJWSKeySelector() == null) {
throw new BadJWTException("Verification of signed JWTs not configured");
}
ConfigurableJWTProcessor jwtProcessor = new DefaultJWTProcessor();
jwtProcessor.setJWSKeySelector(getJWSKeySelector());
jwtProcessor.setJWEKeySelector(getJWEKeySelector());
jwtProcessor.setJWTClaimsSetVerifier(new JARMClaimsVerifier(getExpectedIssuer(), getClientID(), getMaxClockSkew()));
return jwtProcessor.process(jwtResponse, null);
}
/**
* Creates a key selector for JWS verification.
*
* @param asMetadata The Authorisation Server metadata. Must not be
* {@code null}.
* @param clientInfo The OAuth 2.0 client information. Must not be
* {@code null}.
*
* @return The JWS key selector.
*
* @throws GeneralException If the supplied Authorisation Server
* metadata or OAuth 2.0 client information
* are missing a required parameter or
* inconsistent.
*/
protected static JWSKeySelector createJWSKeySelector(final com.nimbusds.oauth2.sdk.as.AuthorizationServerMetadata asMetadata,
final ClientInformation clientInfo)
throws GeneralException {
final JWSAlgorithm expectedJWSAlg = clientInfo.getMetadata().getAuthorizationJWSAlg();
if (asMetadata.getAuthorizationJWSAlgs() == null) {
throw new GeneralException("Missing Authorization Server authorization_signing_alg_values_supported parameter");
}
if (! asMetadata.getAuthorizationJWSAlgs().contains(expectedJWSAlg)) {
throw new GeneralException("The Authorization Server doesn't support " + expectedJWSAlg + " authorization responses");
}
if (Algorithm.NONE.equals(expectedJWSAlg)) {
// Skip creation of JWS key selector, plain ID tokens expected
return null;
} else if (JWSAlgorithm.Family.RSA.contains(expectedJWSAlg) || JWSAlgorithm.Family.EC.contains(expectedJWSAlg)) {
URL jwkSetURL;
try {
jwkSetURL = asMetadata.getJWKSetURI().toURL();
} catch (MalformedURLException e) {
throw new GeneralException("Invalid jwk set URI: " + e.getMessage(), e);
}
JWKSource jwkSource = new RemoteJWKSet(jwkSetURL); // TODO specify HTTP response limits
return new JWSVerificationKeySelector(expectedJWSAlg, jwkSource);
} else if (JWSAlgorithm.Family.HMAC_SHA.contains(expectedJWSAlg)) {
Secret clientSecret = clientInfo.getSecret();
if (clientSecret == null) {
throw new GeneralException("Missing client secret");
}
return new JWSVerificationKeySelector(expectedJWSAlg, new ImmutableSecret(clientSecret.getValueBytes()));
} else {
throw new GeneralException("Unsupported JWS algorithm: " + expectedJWSAlg);
}
}
/**
* Creates a key selector for JWE decryption.
*
* @param asMetadata The Authorisation Server metadata. Must not
* be {@code null}.
* @param clientInfo The OAuth 2.0 client information. Must not be
* {@code null}.
* @param clientJWKSource The client private JWK source, {@code null}
* if encrypted JWT-secured authorisation
* responses are not expected.
*
* @return The JWE key selector.
*
* @throws GeneralException If the supplied Authorisation Server
* metadata or OAuth 2.0 client information
* are missing a required parameter or
* inconsistent.
*/
protected static JWEKeySelector createJWEKeySelector(final AuthorizationServerMetadata asMetadata,
final ClientInformation clientInfo,
final JWKSource clientJWKSource)
throws GeneralException {
final JWEAlgorithm expectedJWEAlg = clientInfo.getMetadata().getAuthorizationJWEAlg();
final EncryptionMethod expectedJWEEnc = clientInfo.getMetadata().getAuthorizationJWEEnc();
if (expectedJWEAlg == null) {
// Encrypted JWTs not expected
return null;
}
if (expectedJWEEnc == null) {
throw new GeneralException("Missing required authorization response JWE encryption method for " + expectedJWEAlg);
}
if (asMetadata.getAuthorizationJWEAlgs() == null || ! asMetadata.getAuthorizationJWEAlgs().contains(expectedJWEAlg)) {
throw new GeneralException("The Authorization Server doesn't support " + expectedJWEAlg + " authorization responses");
}
if (asMetadata.getAuthorizationJWEEncs() == null || ! asMetadata.getAuthorizationJWEEncs().contains(expectedJWEEnc)) {
throw new GeneralException("The Authorization Server doesn't support " + expectedJWEAlg + " / " + expectedJWEEnc + " authorization responses");
}
return new JWEDecryptionKeySelector(expectedJWEAlg, expectedJWEEnc, clientJWKSource);
}
/**
* Creates a new JARM validator for the specified Authorisation Server
* metadata and OAuth 2.0 client registration.
*
* @param asMetadata The Authorisation Server metadata. Must not
* be {@code null}.
* @param clientInfo The OAuth 2.0 client registration. Must not
* be {@code null}.
* @param clientJWKSource The client private JWK source, {@code null}
* if encrypted authorisation responses are not
* expected.
*
* @return The JARM validator.
*
* @throws GeneralException If the supplied Authorisation Server
* metadata or OAuth 2.0 client information
* are missing a required parameter or
* inconsistent.
*/
public static JARMValidator create(final AuthorizationServerMetadata asMetadata,
final ClientInformation clientInfo,
final JWKSource clientJWKSource)
throws GeneralException {
// Create JWS key selector, unless id_token alg = none
final JWSKeySelector jwsKeySelector = createJWSKeySelector(asMetadata, clientInfo);
// Create JWE key selector if encrypted ID tokens are expected
final JWEKeySelector jweKeySelector = createJWEKeySelector(asMetadata, clientInfo, clientJWKSource);
return new JARMValidator(asMetadata.getIssuer(), clientInfo.getID(), jwsKeySelector, jweKeySelector);
}
/**
* Creates a new JARM validator for the specified Authorisation Server
* metadata and OAuth 2.0 client registration.
*
* @param asMetadata The Authorisation Server metadata. Must not be
* {@code null}.
* @param clientInfo The OAuth 2.0 client registration. Must not be
* {@code null}.
*
* @return The JARM validator.
*
* @throws GeneralException If the supplied Authorisation Server
* metadata or OAuth 2.0 client information
* are missing a required parameter or
* inconsistent.
*/
public static JARMValidator create(final AuthorizationServerMetadata asMetadata,
final ClientInformation clientInfo)
throws GeneralException {
return create(asMetadata, clientInfo, null);
}
/**
* Creates a new JARM validator for the specified Authorisation Server
* or OpenID Provider, which must publish its metadata at
* {@code [issuer-url]/.well-known/oauth-authorization-server} resp.
* {@code [issuer-url]/.well-known/openid-configuration}.
*
* @param issuer The Authorisation Server / OpenID Provider issuer
* identifier. Must not be {@code null}.
* @param clientInfo The OAuth 2.0 client registration. Must not be
* {@code null}.
*
* @return The JARM validator.
*
* @throws GeneralException If the resolved Authorisation Server /
* OpenID Provider metadata is invalid.
* @throws IOException On a HTTP exception.
*/
public static JARMValidator create(final Issuer issuer,
final ClientInformation clientInfo)
throws GeneralException, IOException {
return create(issuer, clientInfo, null, 0, 0);
}
/**
* Creates a new JARM validator for the specified Authorisation Server
* or OpenID Provider, which must publish its metadata at
* {@code [issuer-url]/.well-known/oauth-authorization-server} resp.
* {@code [issuer-url]/.well-known/openid-configuration}.
*
* @param issuer The Authorisation Server / OpenID Provider
* issuer identifier. Must not be {@code null}.
* @param clientInfo The OAuth 2.0 client registration. Must not
* be {@code null}.
* @param clientJWKSource The client private JWK source, {@code null}
* if encrypted authorisation responses are not
* expected.
* @param connectTimeout The HTTP connect timeout, in milliseconds.
* Zero implies no timeout. Must not be
* negative.
* @param readTimeout The HTTP response read timeout, in
* milliseconds. Zero implies no timeout. Must
* not be negative.
*
* @return The JARM validator.
*
* @throws GeneralException If the resolved Authorisation Server /
* OpenID Provider metadata is invalid.
* @throws IOException On a HTTP exception.
*/
public static JARMValidator create(final Issuer issuer,
final ClientInformation clientInfo,
final JWKSource clientJWKSource,
final int connectTimeout,
final int readTimeout)
throws GeneralException, IOException {
AuthorizationServerMetadata asMetadata;
try {
// Try OP well-known URL first
asMetadata = OIDCProviderMetadata.resolve(issuer, connectTimeout, readTimeout);
} catch (Exception e) {
// Retry with AS well-known URL
asMetadata = AuthorizationServerMetadata.resolve(issuer, connectTimeout, readTimeout);
}
return create(asMetadata, clientInfo, clientJWKSource);
}
}