Support OIDC Client JWT Bearer authentication

quarkusio · Feb 6, 2024 · 5f8d63f · 5f8d63f
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diff --git a/docs/src/main/asciidoc/security-openid-connect-client-reference.adoc b/docs/src/main/asciidoc/security-openid-connect-client-reference.adoc
@@ -702,6 +702,71 @@ quarkus.oidc-client.credentials.jwt.subject=custom-subject
 quarkus.oidc-client.credentials.jwt.issuer=custom-issuer
 ----
 
+==== JWT Bearer
+
+link:https://www.rfc-editor.org/rfc/rfc7523[RFC7523] explains how JWT Bearer tokens can be used to authenticate clients, see the link:https://www.rfc-editor.org/rfc/rfc7523#section-2.2[Using JWTs for Client Authentication] section for more information.
+
+It can be enabled as follows:
+
+[source,properties]
+----
+quarkus.oidc-client.auth-server-url=${auth-server-url}
+quarkus.oidc-client.client-id=quarkus-app
+quarkus.oidc-client.credentials.jwt.source=bearer
+----
+
+Next, the JWT bearer token must be provided as a `client_assertion` parameter to the OIDC client.
+
+You can use `OidcClient` methods for acquiring or refreshing tokens which accept additional grant parameters, for example, `oidcClient.getTokens(Map.of("client_assertion", "ey..."))`.
+
+If you work work with the OIDC client filters then you must register a custom filter which will provide this assertion.
+
+Here is an example of the RestEasy Reactive custom filter:
+
+[source,java]
+----
+package io.quarkus.it.keycloak;
+
+import java.util.Map;
+
+import io.quarkus.oidc.client.reactive.filter.runtime.AbstractOidcClientRequestReactiveFilter;
+import io.quarkus.oidc.common.runtime.OidcConstants;
+import jakarta.annotation.Priority;
+import jakarta.ws.rs.Priorities;
+
+@Priority(Priorities.AUTHENTICATION)
+public class OidcClientRequestCustomFilter extends AbstractOidcClientRequestReactiveFilter {
+
+    @Override
+    protected Map<String, String> additionalParameters() {
+        return Map.of(OidcConstants.CLIENT_ASSERTION, "ey...");
+    }
+}
+----
+
+Here is an example of the RestEasy Classic custom filter:
+
+[source,java]
+----
+package io.quarkus.it.keycloak;
+
+import java.util.Map;
+
+import io.quarkus.oidc.client.filter.runtime.AbstractOidcClientRequestFilter;
+import io.quarkus.oidc.common.runtime.OidcConstants;
+import jakarta.annotation.Priority;
+import jakarta.ws.rs.Priorities;
+
+@Priority(Priorities.AUTHENTICATION)
+public class OidcClientRequestCustomFilter extends AbstractOidcClientRequestFilter {
+
+    @Override
+    protected Map<String, String> additionalParameters() {
+        return Map.of(OidcConstants.CLIENT_ASSERTION, "ey...");
+    }
+}
+----
+
 ==== Apple POST JWT
 
 Apple OpenID Connect Provider uses a `client_secret_post` method where a secret is a JWT produced with a `private_key_jwt` authentication method but with Apple account-specific issuer and subject properties.

diff --git a/...c-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/AbstractTokensProducer.java b/...c-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/AbstractTokensProducer.java
@@ -1,5 +1,6 @@
 package io.quarkus.oidc.client.runtime;
 
+import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
 
@@ -45,7 +46,7 @@ public void init() {
 
     protected void initTokens() {
         if (earlyTokenAcquisition) {
-            tokensHelper.initTokens(oidcClient);
+            tokensHelper.initTokens(oidcClient, additionalParameters());
         }
     }
 
@@ -56,7 +57,7 @@ public Uni<Tokens> getTokens() {
             LOG.debugf("%s OidcClient will discard the current access and refresh tokens",
                     clientId.orElse(DEFAULT_OIDC_CLIENT_ID));
         }
-        return tokensHelper.getTokens(oidcClient, forceNewTokens);
+        return tokensHelper.getTokens(oidcClient, additionalParameters(), forceNewTokens);
     }
 
     public Tokens awaitTokens() {
@@ -78,4 +79,11 @@ protected Optional<String> clientId() {
     protected boolean isForceNewTokens() {
         return false;
     }
+
+    /**
+     * @return Additional parameters which will be used during the token acquisition or refresh methods.
+     */
+    protected Map<String, String> additionalParameters() {
+        return Map.of();
+    }
 }
diff --git a/...ions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientImpl.java b/...ions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/OidcClientImpl.java
@@ -20,6 +20,7 @@
 import io.quarkus.oidc.common.OidcEndpoint;
 import io.quarkus.oidc.common.OidcRequestContextProperties;
 import io.quarkus.oidc.common.OidcRequestFilter;
+import io.quarkus.oidc.common.runtime.OidcCommonConfig.Credentials.Jwt.Source;
 import io.quarkus.oidc.common.runtime.OidcCommonUtils;
 import io.quarkus.oidc.common.runtime.OidcConstants;
 import io.smallrye.mutiny.Uni;
@@ -47,6 +48,7 @@ public class OidcClientImpl implements OidcClient {
     private final String grantType;
     private final String clientSecretBasicAuthScheme;
     private final Key clientJwtKey;
+    private final boolean jwtBearerAuthentication;
     private final OidcClientConfig oidcConfig;
     private final Map<OidcEndpoint.Type, List<OidcRequestFilter>> filters;
     private volatile boolean closed;
@@ -63,7 +65,8 @@ public OidcClientImpl(WebClient client, String tokenRequestUri, String tokenRevo
         this.oidcConfig = oidcClientConfig;
         this.filters = filters;
         this.clientSecretBasicAuthScheme = OidcCommonUtils.initClientSecretBasicAuth(oidcClientConfig);
-        this.clientJwtKey = OidcCommonUtils.initClientJwtKey(oidcClientConfig);
+        this.jwtBearerAuthentication = oidcClientConfig.credentials.jwt.source == Source.BEARER;
+        this.clientJwtKey = jwtBearerAuthentication ? null : OidcCommonUtils.initClientJwtKey(oidcClientConfig);
     }
 
     @Override
@@ -143,6 +146,15 @@ private UniOnItem<HttpResponse<Buffer>> postRequest(OidcEndpoint.Type endpointTy
         }
         if (clientSecretBasicAuthScheme != null) {
             request.putHeader(AUTHORIZATION_HEADER, clientSecretBasicAuthScheme);
+        } else if (jwtBearerAuthentication) {
+            if (!additionalGrantParameters.containsKey(OidcConstants.CLIENT_ASSERTION)) {
+                String errorMessage = String.format(
+                        "%s OidcClient can not complete the %s grant request because a JWT bearer client_assertion is missing",
+                        oidcConfig.getId().get(), (refresh ? OidcConstants.REFRESH_TOKEN_GRANT : grantType));
+                LOG.error(errorMessage);
+                throw new OidcClientException(errorMessage);
+            }
+            body.add(OidcConstants.CLIENT_ASSERTION_TYPE, OidcConstants.JWT_BEARER_CLIENT_ASSERTION_TYPE);
         } else if (clientJwtKey != null) {
             // if it is a refresh then a map has already been copied
             body = !refresh ? copyMultiMap(body) : body;

diff --git a/...nsions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/TokensHelper.java b/...nsions/oidc-client/runtime/src/main/java/io/quarkus/oidc/client/runtime/TokensHelper.java
@@ -1,5 +1,6 @@
 package io.quarkus.oidc.client.runtime;
 
+import java.util.Map;
 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
 import java.util.function.BiConsumer;
 
@@ -16,15 +17,20 @@ public class TokensHelper {
             .newUpdater(TokensHelper.class, TokenRequestState.class, "tokenRequestState");
 
     public void initTokens(OidcClient oidcClient) {
+        initTokens(oidcClient, Map.of());
+    }
+
+    public void initTokens(OidcClient oidcClient, Map<String, String> additionalParameters) {
         //init the tokens, this just happens in a blocking manner for now
-        tokenRequestStateUpdater.set(this, new TokenRequestState(oidcClient.getTokens().await().indefinitely()));
+        tokenRequestStateUpdater.set(this,
+                new TokenRequestState(oidcClient.getTokens(additionalParameters).await().indefinitely()));
     }
 
     public Uni<Tokens> getTokens(OidcClient oidcClient) {
-        return getTokens(oidcClient, false);
+        return getTokens(oidcClient, Map.of(), false);
     }
 
-    public Uni<Tokens> getTokens(OidcClient oidcClient, boolean forceNewTokens) {
+    public Uni<Tokens> getTokens(OidcClient oidcClient, Map<String, String> additionalParameters, boolean forceNewTokens) {
         TokenRequestState currentState = null;
         TokenRequestState newState = null;
         //if the tokens are expired we refresh them in an async manner
@@ -34,7 +40,7 @@ public Uni<Tokens> getTokens(OidcClient oidcClient, boolean forceNewTokens) {
             if (currentState == null) {
                 //init the initial state
                 //note that this can still happen at runtime as if there is an error then the state will be null
-                newState = new TokenRequestState(prepareUni(oidcClient.getTokens()));
+                newState = new TokenRequestState(prepareUni(oidcClient.getTokens(additionalParameters)));
                 if (tokenRequestStateUpdater.compareAndSet(this, currentState, newState)) {
                     return newState.tokenUni;
                 }
@@ -46,8 +52,8 @@ public Uni<Tokens> getTokens(OidcClient oidcClient, boolean forceNewTokens) {
                 if (forceNewTokens || tokens.isAccessTokenExpired() || tokens.isAccessTokenWithinRefreshInterval()) {
                     newState = new TokenRequestState(
                             prepareUni((!forceNewTokens && tokens.getRefreshToken() != null && !tokens.isRefreshTokenExpired())
-                                    ? oidcClient.refreshTokens(tokens.getRefreshToken())
-                                    : oidcClient.getTokens()));
+                                    ? oidcClient.refreshTokens(tokens.getRefreshToken(), additionalParameters)
+                                    : oidcClient.getTokens(additionalParameters)));
                     if (tokenRequestStateUpdater.compareAndSet(this, currentState, newState)) {
                         return newState.tokenUni;
                     }

diff --git a/...ns/oidc-common/runtime/src/main/java/io/quarkus/oidc/common/runtime/OidcCommonConfig.java b/...ns/oidc-common/runtime/src/main/java/io/quarkus/oidc/common/runtime/OidcCommonConfig.java
@@ -178,7 +178,7 @@ public static enum Method {
                 POST_JWT,
 
                 /**
-                 * client id and secret are submitted as HTTP query parameters. This option is only supported for the OIDC
+                 * client id and secret are submitted as HTTP query parameters. This option is only supported by the OIDC
                  * extension.
                  */
                 QUERY
@@ -232,12 +232,29 @@ public void setSecretProvider(Provider secretProvider) {
         /**
          * Supports the client authentication `client_secret_jwt` and `private_key_jwt` methods, which involves sending a JWT
          * token assertion signed with a client secret or private key.
+         * JWT Bearer client authentication is also supported.
          *
          * @see <a href=
          *      "https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication">https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication</a>
          */
         @ConfigGroup
         public static class Jwt {
+
+            public static enum Source {
+                // JWT token is generated by the OIDC provider client to support
+                // `client_secret_jwt` and `private_key_jwt` authentication methods
+                CLIENT,
+                // JWT bearer token as used as a client assertion: https://www.rfc-editor.org/rfc/rfc7523#section-2.2
+                // This option is only supported by the OIDC client extension.
+                BEARER
+            }
+
+            /**
+             * JWT token source: OIDC provider client or an existing JWT bearer token.
+             */
+            @ConfigItem(defaultValue = "client")
+            public Source source = Source.CLIENT;
+
             /**
              * If provided, indicates that JWT is signed using a secret key.
              */
@@ -391,6 +408,14 @@ public void setClaims(Map<String, String> claims) {
                 this.claims = claims;
             }
 
+            public Source getSource() {
+                return source;
+            }
+
+            public void setSource(Source source) {
+                this.source = source;
+            }
+
         }
 
         /**

diff --git a/...ion-tests/oidc-client-wiremock/src/main/java/io/quarkus/it/keycloak/FrontendResource.java b/...ion-tests/oidc-client-wiremock/src/main/java/io/quarkus/it/keycloak/FrontendResource.java
@@ -25,6 +25,10 @@ public class FrontendResource {
     @RestClient
     ProtectedResourceServiceOidcClient protectedResourceServiceOidcClient;
 
+    @Inject
+    @RestClient
+    JwtBearerAuthenticationOidcClient jwtBearerAuthenticationOidcClient;
+
     @Inject
     @NamedOidcClient("non-standard-response")
     Tokens tokens;
@@ -42,6 +46,12 @@ public String echoToken() {
         return protectedResourceServiceOidcClient.echoToken();
     }
 
+    @GET
+    @Path("echoTokenJwtBearerAuthentication")
+    public String echoTokenJwtBearerAuthentication() {
+        return jwtBearerAuthenticationOidcClient.echoToken();
+    }
+
     @GET
     @Path("echoTokenNonStandardResponse")
     public String echoTokenNonStandardResponse() {

diff --git a/...ient-wiremock/src/main/java/io/quarkus/it/keycloak/JwtBearerAuthenticationOidcClient.java b/...ient-wiremock/src/main/java/io/quarkus/it/keycloak/JwtBearerAuthenticationOidcClient.java
@@ -0,0 +1,16 @@
+package io.quarkus.it.keycloak;
+
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+
+import org.eclipse.microprofile.rest.client.annotation.RegisterProvider;
+import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
+
+@RegisterRestClient
+@RegisterProvider(value = OidcClientRequestCustomFilter.class)
+@Path("/")
+public interface JwtBearerAuthenticationOidcClient {
+
+    @GET
+    String echoToken();
+}
diff --git a/...c-client-wiremock/src/main/java/io/quarkus/it/keycloak/OidcClientRequestCustomFilter.java b/...c-client-wiremock/src/main/java/io/quarkus/it/keycloak/OidcClientRequestCustomFilter.java
@@ -0,0 +1,24 @@
+package io.quarkus.it.keycloak;
+
+import java.util.Map;
+import java.util.Optional;
+
+import jakarta.annotation.Priority;
+import jakarta.ws.rs.Priorities;
+
+import io.quarkus.oidc.client.filter.runtime.AbstractOidcClientRequestFilter;
+import io.quarkus.oidc.common.runtime.OidcConstants;
+
+@Priority(Priorities.AUTHENTICATION)
+public class OidcClientRequestCustomFilter extends AbstractOidcClientRequestFilter {
+
+    @Override
+    protected Map<String, String> additionalParameters() {
+        return Map.of(OidcConstants.CLIENT_ASSERTION, "123456");
+    }
+
+    @Override
+    protected Optional<String> clientId() {
+        return Optional.of("jwtbearer");
+    }
+}
diff --git a/integration-tests/oidc-client-wiremock/src/main/resources/application.properties b/integration-tests/oidc-client-wiremock/src/main/resources/application.properties
@@ -7,6 +7,12 @@ quarkus.oidc-client.grant.type=password
 quarkus.oidc-client.grant-options.password.username=alice
 quarkus.oidc-client.grant-options.password.password=alice
 
+quarkus.oidc-client.jwtbearer.auth-server-url=${keycloak.url}
+quarkus.oidc-client.jwtbearer.discovery-enabled=false
+quarkus.oidc-client.jwtbearer.token-path=/tokens-jwtbearer
+quarkus.oidc-client.jwtbearer.client-id=quarkus-app
+quarkus.oidc-client.jwtbearer.credentials.jwt.source=bearer
+
 quarkus.oidc-client.password-grant-public-client.token-path=${keycloak.url}/tokens_public_client
 quarkus.oidc-client.password-grant-public-client.client-id=quarkus-app
 quarkus.oidc-client.password-grant-public-client.grant.type=password
@@ -51,6 +57,7 @@ quarkus.oidc-client.ciba-grant.credentials.client-secret.method=POST
 quarkus.oidc-client.ciba-grant.grant.type=ciba
 
 io.quarkus.it.keycloak.ProtectedResourceServiceOidcClient/mp-rest/url=http://localhost:8081/protected
+io.quarkus.it.keycloak.JwtBearerAuthenticationOidcClient/mp-rest/url=http://localhost:8081/protected
 
 quarkus.log.category."io.quarkus.oidc.client.runtime.OidcClientImpl".min-level=TRACE
 quarkus.log.category."io.quarkus.oidc.client.runtime.OidcClientImpl".level=TRACE

diff --git a/...dc-client-wiremock/src/test/java/io/quarkus/it/keycloak/KeycloakRealmResourceManager.java b/...dc-client-wiremock/src/test/java/io/quarkus/it/keycloak/KeycloakRealmResourceManager.java
@@ -35,6 +35,15 @@ public Map<String, String> start() {
                         .withHeader("Content-Type", MediaType.APPLICATION_JSON)
                         .withBody(
                                 "{\"access_token\":\"access_token_1\", \"expires_in\":4, \"refresh_token\":\"refresh_token_1\"}")));
+        server.stubFor(WireMock.post("/tokens-jwtbearer")
+                .withRequestBody(matching("grant_type=client_credentials&"
+                        + "client_assertion_type=urn%3Aietf%3Aparams%3Aoauth%3Aclient-assertion-type%3Ajwt-bearer&"
+                        + "client_assertion=123456"))
+                .willReturn(WireMock
+                        .aResponse()
+                        .withHeader("Content-Type", MediaType.APPLICATION_JSON)
+                        .withBody(
+                                "{\"access_token\":\"access_token_jwt_bearer\", \"expires_in\":4, \"refresh_token\":\"refresh_token_jwt_bearer\"}")));
         server.stubFor(WireMock.post("/tokens_public_client")
                 .withRequestBody(matching("grant_type=password&username=alice&password=alice&client_id=quarkus-app"))
                 .willReturn(WireMock

diff --git a/...ation-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/OidcClientTest.java b/...ation-tests/oidc-client-wiremock/src/test/java/io/quarkus/it/keycloak/OidcClientTest.java
@@ -33,6 +33,14 @@ public class OidcClientTest {
     @InjectWireMock
     WireMockServer server;
 
+    @Test
+    public void testEchoTokensJwtBearerAuthentication() {
+        RestAssured.when().get("/frontend/echoTokenJwtBearerAuthentication")
+                .then()
+                .statusCode(200)
+                .body(equalTo("access_token_jwt_bearer"));
+    }
+
     @Test
     public void testEchoAndRefreshTokens() {
         // access_token_1 and refresh_token_1 are acquired using a password grant request.