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https://issues.apache.org/jira/browse/NIFI-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16109958#comment-16109958
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ASF GitHub Bot commented on NIFI-4210:
--------------------------------------
Github user alopresto commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2047#discussion_r130750100
--- Diff:
nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-web/nifi-web-security/src/main/java/org/apache/nifi/web/security/oidc/OidcService.java
---
@@ -0,0 +1,207 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.apache.nifi.web.security.oidc;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.nimbusds.oauth2.sdk.AuthorizationGrant;
+import com.nimbusds.oauth2.sdk.Scope;
+import com.nimbusds.oauth2.sdk.id.State;
+import org.apache.nifi.web.security.util.CacheKey;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.net.URI;
+import java.security.SecureRandom;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import static
org.apache.nifi.web.security.oidc.StandardOidcIdentityProvider.OPEN_ID_CONNECT_SUPPORT_IS_NOT_CONFIGURED;
+
+/**
+ * OidcService is a service for managing the OpenId Connect Authorization
flow.
+ */
+public class OidcService {
+
+ private OidcIdentityProvider identityProvider;
+ private Cache<CacheKey, State> stateLookupForPendingRequests; //
identifier from cookie -> state value
+ private Cache<CacheKey, String> jwtLookupForCompletedRequests; //
identifier from cookie -> jwt or identity (and generate jwt on retrieval)
+
+ /**
+ * Creates a new OtpService with an expiration of 5 minutes.
+ */
+ public OidcService(final OidcIdentityProvider identityProvider) {
+ this(identityProvider, 60, TimeUnit.SECONDS);
+ }
+
+ /**
+ * Creates a new OtpService.
+ *
+ * @param duration The expiration duration
+ * @param units The expiration units
+ * @throws NullPointerException If units is null
+ * @throws IllegalArgumentException If duration is negative
+ */
+ public OidcService(final OidcIdentityProvider identityProvider, final
int duration, final TimeUnit units) {
+ this.identityProvider = identityProvider;
+ this.stateLookupForPendingRequests =
CacheBuilder.newBuilder().expireAfterWrite(duration, units).build();
+ this.jwtLookupForCompletedRequests =
CacheBuilder.newBuilder().expireAfterWrite(duration, units).build();
+ }
+
+ /**
+ * Returns whether OpenId Connect is enabled.
+ *
+ * @return whether OpenId Connect is enabled
+ */
+ public boolean isOidcEnabled() {
+ return identityProvider.isOidcEnabled();
+ }
+
+ /**
+ * Returns the OpenId Connect authorization endpoint.
+ *
+ * @return the authorization endpoint
+ */
+ public URI getAuthorizationEndpoint() {
+ return identityProvider.getAuthorizationEndpoint();
+ }
+
+ /**
+ * Returns the OpenId Connect scope.
+ *
+ * @return scope
+ */
+ public Scope getScope() {
+ return identityProvider.getScope();
+ }
+
+ /**
+ * Returns the OpenId Connect client id.
+ *
+ * @return client id
+ */
+ public String getClientId() {
+ return identityProvider.getClientId().getValue();
+ }
+
+ /**
+ * Initiates an OpenId Connection authorization code flow using the
specified request identifier to maintain state.
+ *
+ * @param oidcRequestIdentifier request identifier
+ * @return state
+ */
+ public State createState(final String oidcRequestIdentifier) {
+ if (!isOidcEnabled()) {
+ throw new
IllegalStateException(OPEN_ID_CONNECT_SUPPORT_IS_NOT_CONFIGURED);
+ }
+
+ final CacheKey oidcRequestIdentifierKey = new
CacheKey(oidcRequestIdentifier);
+ final State state = new State(new BigInteger(130, new
SecureRandom()).toString(32));
--- End diff --
We may want to include a comment here or encapsulate the generation process
to a separate method -- magic numbers may lead people to change them in the
future without understanding them.
The reasoning for these values here is that 128 bits is considered
cryptographically strong with current hardware/software, but a Base32 digit
needs 5 bits to be fully encoded, so 128 is rounded up to 130. Base32 is chosen
because it encodes data with a single case and without including confusing or
URI-incompatible characters, unlike Base64, but is approximately 20% more
compact than Base16/hexadecimal.
> Add OpenId Connect support for authenticating users
> ---------------------------------------------------
>
> Key: NIFI-4210
> URL: https://issues.apache.org/jira/browse/NIFI-4210
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework, Core UI
> Reporter: Matt Gilman
> Assignee: Matt Gilman
>
> Add support for authenticating users with the OpenId Connection
> specification. Evaluate whether a new extension point is necessary to allow
> for a given provider to supply custom code for instance to implement custom
> token validation.
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