Put License API can return HTTP 500 (#79093)

* Put License API can return HTTP 500

Put License now returns HTTP 400 if parsing user input fails, such as Base64 encoding or invalid signature.

Closes #74058

client/rest-high-level/src/test/java/org/elasticsearch/client/LicenseIT.java

@@ -9,6 +9,7 @@
 package org.elasticsearch.client;
 
 import org.elasticsearch.Build;
+import org.elasticsearch.ElasticsearchStatusException;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
 import org.elasticsearch.client.license.DeleteLicenseRequest;
 import org.elasticsearch.client.license.GetBasicStatusResponse;
@@ -23,6 +24,7 @@ import org.elasticsearch.client.license.StartBasicResponse;
 import org.elasticsearch.client.license.StartTrialRequest;
 import org.elasticsearch.client.license.StartTrialResponse;
 import org.elasticsearch.common.Strings;
+import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.xcontent.XContentParser;
 import org.elasticsearch.xcontent.json.JsonXContent;
 import org.junit.After;
@@ -40,6 +42,7 @@ import static org.hamcrest.CoreMatchers.nullValue;
 import static org.hamcrest.Matchers.empty;
 import static org.hamcrest.Matchers.emptyOrNullString;
 import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.stringContainsInOrder;
 
 public class LicenseIT extends ESRestHighLevelClientTestCase {
 
@@ -91,6 +94,40 @@ public class LicenseIT extends ESRestHighLevelClientTestCase {
         }
     }
 
+    public void testPutInvalidTrialLicense() throws Exception {
+        assumeTrue("Trial license is only valid when tested against snapshot/test builds",
+            Build.CURRENT.isSnapshot());
+
+        // use a hard-coded trial license for 20 yrs to be able to roll back from another licenses
+        final String signature = "xx"; // Truncated, so it is expected to fail validation
+        final String licenseDefinition = Strings.toString(jsonBuilder()
+            .startObject()
+            .field("licenses", List.of(
+                Map.of(
+                    "uid", "96fc37c6-6fc9-43e2-a40d-73143850cd72",
+                    "type", "trial",
+                    // 2018-10-16 07:02:48 UTC
+                    "issue_date_in_millis", "1539673368158",
+                    // 2038-10-11 07:02:48 UTC, 20 yrs later
+                    "expiry_date_in_millis", "2170393368158",
+                    "max_nodes", "5",
+                    "issued_to", "client_rest-high-level_integTestCluster",
+                    "issuer", "elasticsearch",
+                    "start_date_in_millis", "-1",
+                    "signature", signature)))
+            .endObject());
+
+        final PutLicenseRequest request = new PutLicenseRequest();
+        request.setAcknowledge(true);
+        request.setLicenseDefinition(licenseDefinition);
+        ElasticsearchStatusException e = expectThrows(
+            ElasticsearchStatusException.class,
+            () -> highLevelClient().license().putLicense(request, RequestOptions.DEFAULT)
+        );
+        assertThat(e.status(), equalTo(RestStatus.BAD_REQUEST));
+        assertThat(e.getMessage(), stringContainsInOrder("malformed signature for license"));
+    }
+
     public static void putTrialLicense() throws IOException {
         assumeTrue("Trial license is only valid when tested against snapshot/test builds",
             Build.CURRENT.isSnapshot());

x-pack/plugin/core/src/main/java/org/elasticsearch/license/License.java

@@ -642,7 +642,7 @@ public class License implements ToXContentObject {
                 ByteBuffer byteBuffer = ByteBuffer.wrap(signatureBytes);
                 version = byteBuffer.getInt();
             } catch (Exception e) {
-                throw new ElasticsearchException("malformed signature for license [" + builder.uid + "]", e);
+                throw new ElasticsearchParseException("malformed signature for license [" + builder.uid + "]", e);
             }
             // we take the absolute version, because negative versions
             // mean that the license was generated by the cluster (see TrialLicense)
@@ -651,9 +651,9 @@ public class License implements ToXContentObject {
                 version *= -1;
             }
             if (version == 0) {
-                throw new ElasticsearchException("malformed signature for license [" + builder.uid + "]");
+                throw new ElasticsearchParseException("malformed signature for license [" + builder.uid + "]");
             } else if (version > VERSION_CURRENT) {
-                throw new ElasticsearchException("Unknown license version found, please upgrade all nodes to the latest " +
+                throw new ElasticsearchParseException("Unknown license version found, please upgrade all nodes to the latest " +
                     "elasticsearch-license plugin");
             }
             // signature version is the source of truth