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diff --git a/web/core/modules/migrate_drupal/src/MigrationPluginManager.php b/web/core/modules/migrate_drupal/src/MigrationPluginManager.php
new file mode 100644
index 000000000..0233de21a
--- /dev/null
+++ b/web/core/modules/migrate_drupal/src/MigrationPluginManager.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace Drupal\migrate_drupal;
+
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\migrate\Plugin\Exception\BadPluginDefinitionException;
+use Drupal\migrate\Plugin\MigrateSourcePluginManager;
+use Drupal\migrate\Plugin\MigrationPluginManager as BaseMigrationPluginManager;
+
+/**
+ * Manages migration plugins.
+ *
+ * Analyzes migration definitions to ensure that the source plugin of any
+ * migration tagged with particular tags ('Drupal 6' or 'Drupal 7' by default)
+ * defines a source_module property in its plugin annotation. This is done in
+ * order to support the Migrate Drupal UI, which needs to know which modules
+ * "own" the data being migrated into Drupal 8, on both the source and
+ * destination sides.
+ *
+ * @todo Enforce the destination_module property too, in
+ * https://www.drupal.org/project/drupal/issues/2923810.
+ */
+class MigrationPluginManager extends BaseMigrationPluginManager {
+
+  /**
+   * The Migrate source plugin manager service.
+   *
+   * @var \Drupal\migrate\Plugin\MigrateSourcePluginManager
+   */
+  protected $sourceManager;
+
+  /**
+   * The config factory service.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * The migration tags which will trigger source_module enforcement.
+   *
+   * @var string[]
+   */
+  protected $enforcedSourceModuleTags;
+
+  /**
+   * MigrationPluginManager constructor.
+   *
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler service.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   The cache backend.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager service.
+   * @param \Drupal\migrate\Plugin\MigrateSourcePluginManager $source_manager
+   *   The Migrate source plugin manager service.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory service.
+   */
+  public function __construct(ModuleHandlerInterface $module_handler, CacheBackendInterface $cache_backend, LanguageManagerInterface $language_manager, MigrateSourcePluginManager $source_manager, ConfigFactoryInterface $config_factory) {
+    parent::__construct($module_handler, $cache_backend, $language_manager);
+    $this->sourceManager = $source_manager;
+    $this->configFactory = $config_factory;
+  }
+
+  /**
+   * Returns the migration tags that trigger source_module enforcement.
+   *
+   * @return string[]
+   */
+  protected function getEnforcedSourceModuleTags() {
+    if ($this->enforcedSourceModuleTags === NULL) {
+      $this->enforcedSourceModuleTags = $this->configFactory
+        ->get('migrate_drupal.settings')
+        ->get('enforce_source_module_tags') ?: [];
+    }
+    return $this->enforcedSourceModuleTags;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function processDefinition(&$definition, $plugin_id) {
+    parent::processDefinition($definition, $plugin_id);
+
+    // If the migration has no tags, we don't need to enforce the source_module
+    // annotation property.
+    if (empty($definition['migration_tags'])) {
+      return;
+    }
+
+    // Check if the migration has any of the tags that trigger source_module
+    // enforcement.
+    $applied_tags = array_intersect($this->getEnforcedSourceModuleTags(), $definition['migration_tags']);
+    if ($applied_tags) {
+      // Throw an exception if the source plugin definition does not define a
+      // source_module.
+      $source_id = $definition['source']['plugin'];
+      $source_definition = $this->sourceManager->getDefinition($source_id);
+      if (empty($source_definition['source_module'])) {
+        throw new BadPluginDefinitionException($source_id, 'source_module');
+      }
+    }
+  }
+
+}