[Test] Increase test secret key length (#117675) (#117738)

Running with FIPS approved mode requires secret keys to be at least 114
bits long.

Relates: #117324 Resolves: #117596 Resolves: #117709 Resolves: #117710
Resolves: #117711 Resolves: #117712
(cherry picked from commit 24bc505)

# Conflicts:
#	modules/repository-s3/src/javaRestTest/java/org/elasticsearch/repositories/s3/RepositoryS3RestReloadCredentialsIT.java
#	muted-tests.yml
#	test/fixtures/s3-fixture/src/main/java/fixture/s3/S3HttpFixtureWithSTS.java

Author: ywangd

modules/repository-s3/src/javaRestTest/java/org/elasticsearch/repositories/s3/RepositoryS3RestReloadCredentialsIT.java

@@ -10,6 +10,7 @@
 package org.elasticsearch.repositories.s3;
 
 import fixture.s3.S3HttpFixture;
+import io.netty.handler.codec.http.HttpMethod;
 
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.ResponseException;
@@ -54,8 +55,6 @@ protected String getTestRestCluster() {
     }
 
     public void testReloadCredentialsFromKeystore() throws IOException {
-        assumeFalse("doesn't work in a FIPS JVM, but that's ok", inFipsJvm());
-
         // Register repository (?verify=false because we don't have access to the blob store yet)
         final var repositoryName = randomIdentifier();
         registerRepository(
@@ -70,15 +69,16 @@ public void testReloadCredentialsFromKeystore() throws IOException {
         final var accessKey1 = randomIdentifier();
         s3Fixture.setAccessKey(accessKey1);
         keystoreSettings.put("s3.client.default.access_key", accessKey1);
-        keystoreSettings.put("s3.client.default.secret_key", randomIdentifier());
+        keystoreSettings.put("s3.client.default.secret_key", randomSecretKey());
         cluster.updateStoredSecureSettings();
-        assertOK(client().performRequest(new Request("POST", "/_nodes/reload_secure_settings")));
+
+        assertOK(client().performRequest(createReloadSecureSettingsRequest()));
 
         // Check access using initial credentials
         assertOK(client().performRequest(verifyRequest));
 
         // Rotate credentials in blob store
-        final var accessKey2 = randomValueOtherThan(accessKey1, ESTestCase::randomIdentifier);
+        final var accessKey2 = randomValueOtherThan(accessKey1, ESTestCase::randomSecretKey);
         s3Fixture.setAccessKey(accessKey2);
 
         // Ensure that initial credentials now invalid
@@ -92,10 +92,17 @@ public void testReloadCredentialsFromKeystore() throws IOException {
         // Set up refreshed credentials
         keystoreSettings.put("s3.client.default.access_key", accessKey2);
         cluster.updateStoredSecureSettings();
-        assertOK(client().performRequest(new Request("POST", "/_nodes/reload_secure_settings")));
+        assertOK(client().performRequest(createReloadSecureSettingsRequest()));
 
         // Check access using refreshed credentials
         assertOK(client().performRequest(verifyRequest));
     }
 
+    private Request createReloadSecureSettingsRequest() throws IOException {
+        return newXContentRequest(
+            HttpMethod.POST,
+            "/_nodes/reload_secure_settings",
+            (b, p) -> inFipsJvm() ? b.field("secure_settings_password", "keystore-password") : b
+        );
+    }
 }

test/fixtures/ec2-imds-fixture/src/main/java/fixture/aws/imds/Ec2ImdsHttpHandler.java

@@ -27,6 +27,7 @@
 import java.util.Set;
 
 import static org.elasticsearch.test.ESTestCase.randomIdentifier;
+import static org.elasticsearch.test.ESTestCase.randomSecretKey;
 
 /**
  * Minimal HTTP handler that emulates the EC2 IMDS server
@@ -82,7 +83,7 @@ public void handle(final HttpExchange exchange) throws IOException {
                         accessKey,
                         ZonedDateTime.now(Clock.systemUTC()).plusDays(1L).format(DateTimeFormatter.ISO_DATE_TIME),
                         randomIdentifier(),
-                        randomIdentifier(),
+                        randomSecretKey(),
                         sessionToken
                     ).getBytes(StandardCharsets.UTF_8);
                     exchange.getResponseHeaders().add("Content-Type", "application/json");

test/framework/src/main/java/org/elasticsearch/test/ESTestCase.java

@@ -1353,6 +1353,13 @@ public static String randomDateFormatterPattern() {
         return randomFrom(FormatNames.values()).getName();
     }
 
+    /**
+     * Generate a random string of at least 112 bits to satisfy minimum entropy requirement when running in FIPS mode.
+     */
+    public static String randomSecretKey() {
+        return randomAlphaOfLengthBetween(14, 20);
+    }
+
     /**
      * Randomly choose between {@link EsExecutors#DIRECT_EXECUTOR_SERVICE} (which does not fork), {@link ThreadPool#generic}, and one of the
      * other named threadpool executors.