Fix responses for the token APIs (elastic#54532)

This commit fixes our behavior regarding the responses we
return in various cases for the use of token related APIs.
More concretely:

- In the Get Token API with the `refresh` grant, when an invalid
(already deleted, malformed, unknown) refresh token is used in the
body of the request, we respond with `400` HTTP status code
 and an `error_description` header with the message "could not
refresh the requested token".
Previously we would return erroneously return a  `401` with "token
malformed" message.

- In the Invalidate Token API, when using an invalid (already
deleted, malformed, unknown) access or refresh token, we respond
with `404` and a body that shows that no tokens were invalidated:
   ```
   {
     "invalidated_tokens":0,
     "previously_invalidated_tokens":0,
      "error_count":0
   }
   ```
   The previous behavior would be to erroneously return
a `400` or `401` ( depending on the case ).

- In the Invalidate Token API, when the tokens index doesn't
exist or is closed, we return `400` because we assume this is
a user issue either because they tried to invalidate a token
when there is no tokens index yet ( i.e. no tokens have
been created yet or the tokens index has been deleted ) or the
index is closed.

- In the Invalidate Token API, when the tokens index is
unavailable, we return a `503` status code because
we want to signal to the caller of the API that the token they
tried to invalidate was not invalidated and we can't be sure
if it is still valid or not, and that they should try the request
again.

Resolves: elastic#53323

client/rest-high-level/src/main/java/org/elasticsearch/client/SecurityClient.java

@@ -765,7 +765,7 @@ public Cancellable createTokenAsync(CreateTokenRequest request, RequestOptions o
      */
     public InvalidateTokenResponse invalidateToken(InvalidateTokenRequest request, RequestOptions options) throws IOException {
         return restHighLevelClient.performRequestAndParseEntity(request, SecurityRequestConverters::invalidateToken, options,
-            InvalidateTokenResponse::fromXContent, emptySet());
+            InvalidateTokenResponse::fromXContent, singleton(404));
     }
 
     /**
@@ -780,7 +780,7 @@ public InvalidateTokenResponse invalidateToken(InvalidateTokenRequest request, R
     public Cancellable invalidateTokenAsync(InvalidateTokenRequest request, RequestOptions options,
                                             ActionListener<InvalidateTokenResponse> listener) {
         return restHighLevelClient.performRequestAsyncAndParseEntity(request, SecurityRequestConverters::invalidateToken, options,
-            InvalidateTokenResponse::fromXContent, listener, emptySet());
+            InvalidateTokenResponse::fromXContent, listener, singleton(404));
     }
 
     /**

client/rest-high-level/src/main/java/org/elasticsearch/client/security/InvalidateTokenResponse.java

@@ -62,10 +62,10 @@ public final class InvalidateTokenResponse {
         PARSER.declareInt(constructorArg(), PREVIOUSLY_INVALIDATED_TOKENS);
         PARSER.declareInt(constructorArg(), ERROR_COUNT);
         PARSER.declareObjectArray(optionalConstructorArg(), (p, c) -> ElasticsearchException.fromXContent(p), ERRORS);
+
     }
 
-    public InvalidateTokenResponse(int invalidatedTokens, int previouslyInvalidatedTokens,
-                                   @Nullable List<ElasticsearchException> errors) {
+    public InvalidateTokenResponse(int invalidatedTokens, int previouslyInvalidatedTokens, @Nullable List<ElasticsearchException> errors) {
         this.invalidatedTokens = invalidatedTokens;
         this.previouslyInvalidatedTokens = previouslyInvalidatedTokens;
         if (null == errors) {

x-pack/docs/en/rest-api/security/oidc-logout-api.asciidoc

@@ -3,7 +3,7 @@
 === OpenID Connect logout API
 
 Submits a request to invalidate a refresh token and an access token that was
-generated as a response to a call to `/_security/oidc/authenticate`. 
+generated as a response to a call to `/_security/oidc/authenticate`.
 
 [[security-api-oidc-logout-request]]
 ==== {api-request-title}
@@ -48,7 +48,7 @@ POST /_security/oidc/logout
   "refresh_token": "vLBPvmAB6KvwvJZr27cS"
 }
 --------------------------------------------------
-// TEST[catch:unauthorized]
+// TEST[catch:request]
 
 The following example output of the response contains the URI pointing to the
 End Session Endpoint of the OpenID Connect Provider with all the parameters of
@@ -60,4 +60,4 @@ the Logout Request, as HTTP GET parameters:
   "redirect" : "https://op-provider.org/logout?id_token_hint=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c&post_logout_redirect_uri=http%3A%2F%2Foidc-kibana.elastic.co%2Floggedout&state=lGYK0EcSLjqH6pkT5EVZjC6eIW5YCGgywj2sxROO"
 }
 --------------------------------------------------
-// NOTCONSOLE
+// NOTCONSOLE

x-pack/docs/en/security/authentication/oidc-guide.asciidoc

@@ -672,7 +672,7 @@ POST /_security/oidc/logout
   "refresh_token": "vLBPvmAB6KvwvJZr27cS"
 }
 --------------------------------------------------
-// TEST[catch:unauthorized]
+// TEST[catch:request]
 +
 If the realm is configured accordingly, this may result in a response with a `redirect` parameter indicating where
 the user needs to be redirected in the OP in order to complete the logout process.

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authc/support/TokensInvalidationResult.java

@@ -14,6 +14,7 @@
 import org.elasticsearch.common.io.stream.Writeable;
 import org.elasticsearch.common.xcontent.ToXContentObject;
 import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.rest.RestStatus;
 
 import java.io.IOException;
 import java.util.Collections;
@@ -33,9 +34,10 @@ public class TokensInvalidationResult implements ToXContentObject, Writeable {
     private final List<String> invalidatedTokens;
     private final List<String> previouslyInvalidatedTokens;
     private final List<ElasticsearchException> errors;
+    private RestStatus restStatus;
 
     public TokensInvalidationResult(List<String> invalidatedTokens, List<String> previouslyInvalidatedTokens,
-                                    @Nullable List<ElasticsearchException> errors) {
+                                    @Nullable List<ElasticsearchException> errors, RestStatus restStatus) {
         Objects.requireNonNull(invalidatedTokens, "invalidated_tokens must be provided");
         this.invalidatedTokens = invalidatedTokens;
         Objects.requireNonNull(previouslyInvalidatedTokens, "previously_invalidated_tokens must be provided");
@@ -45,6 +47,7 @@ public TokensInvalidationResult(List<String> invalidatedTokens, List<String> pre
         } else {
             this.errors = Collections.emptyList();
         }
+        this.restStatus = restStatus;
     }
 
     public TokensInvalidationResult(StreamInput in) throws IOException {
@@ -54,10 +57,13 @@ public TokensInvalidationResult(StreamInput in) throws IOException {
         if (in.getVersion().before(Version.V_7_2_0)) {
             in.readVInt();
         }
+        if (in.getVersion().onOrAfter(Version.V_8_0_0)) {
+            this.restStatus = RestStatus.readFrom(in);
+        }
     }
 
-    public static TokensInvalidationResult emptyResult() {
-        return new TokensInvalidationResult(Collections.emptyList(), Collections.emptyList(), Collections.emptyList());
+    public static TokensInvalidationResult emptyResult(RestStatus restStatus) {
+        return new TokensInvalidationResult(Collections.emptyList(), Collections.emptyList(), Collections.emptyList(), restStatus);
     }
 
 
@@ -73,6 +79,10 @@ public List<ElasticsearchException> getErrors() {
         return errors;
     }
 
+    public RestStatus getRestStatus() {
+        return restStatus;
+    }
+
     @Override
     public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         builder.startObject()
@@ -100,5 +110,8 @@ public void writeTo(StreamOutput out) throws IOException {
         if (out.getVersion().before(Version.V_7_2_0)) {
             out.writeVInt(5);
         }
+        if (out.getVersion().onOrAfter(Version.V_8_0_0)) {
+            RestStatus.writeTo(out, restStatus);
+        }
     }
 }

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/action/token/InvalidateTokenResponseTests.java

@@ -12,6 +12,7 @@
 import org.elasticsearch.common.xcontent.ToXContent;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentFactory;
+import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.xpack.core.security.authc.support.TokensInvalidationResult;
 
@@ -29,7 +30,8 @@ public void testSerialization() throws IOException {
         TokensInvalidationResult result = new TokensInvalidationResult(Arrays.asList(generateRandomStringArray(20, 15, false)),
             Arrays.asList(generateRandomStringArray(20, 15, false)),
             Arrays.asList(new ElasticsearchException("foo", new IllegalArgumentException("this is an error message")),
-                new ElasticsearchException("bar", new IllegalArgumentException("this is an error message2"))));
+                new ElasticsearchException("bar", new IllegalArgumentException("this is an error message2"))),
+            RestStatus.OK);
         InvalidateTokenResponse response = new InvalidateTokenResponse(result);
         try (BytesStreamOutput output = new BytesStreamOutput()) {
             response.writeTo(output);
@@ -45,7 +47,7 @@ public void testSerialization() throws IOException {
         }
 
         result = new TokensInvalidationResult(Arrays.asList(generateRandomStringArray(20, 15, false)),
-            Arrays.asList(generateRandomStringArray(20, 15, false)), Collections.emptyList());
+            Arrays.asList(generateRandomStringArray(20, 15, false)), Collections.emptyList(), RestStatus.OK);
         response = new InvalidateTokenResponse(result);
         try (BytesStreamOutput output = new BytesStreamOutput()) {
             response.writeTo(output);
@@ -64,7 +66,7 @@ public void testToXContent() throws IOException {
         List previouslyInvalidatedTokens = Arrays.asList(generateRandomStringArray(20, 15, false));
         TokensInvalidationResult result = new TokensInvalidationResult(invalidatedTokens, previouslyInvalidatedTokens,
             Arrays.asList(new ElasticsearchException("foo", new IllegalArgumentException("this is an error message")),
-                new ElasticsearchException("bar", new IllegalArgumentException("this is an error message2"))));
+                new ElasticsearchException("bar", new IllegalArgumentException("this is an error message2"))), RestStatus.OK);
         InvalidateTokenResponse response = new InvalidateTokenResponse(result);
         XContentBuilder builder = XContentFactory.jsonBuilder();
         response.toXContent(builder, ToXContent.EMPTY_PARAMS);

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authc/ExpiredTokenRemover.java

@@ -70,6 +70,7 @@ public void doRun() {
             indicesWithTokens.add(securityMainIndex.aliasName());
         }
         if (indicesWithTokens.isEmpty()) {
+            markComplete();
             return;
         }
         DeleteByQueryRequest expiredDbq = new DeleteByQueryRequest(indicesWithTokens.toArray(new String[0]));