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diff --git a/web/core/modules/comment/src/CommentAccessControlHandler.php b/web/core/modules/comment/src/CommentAccessControlHandler.php
new file mode 100644
index 000000000..bcb0fd7a0
--- /dev/null
+++ b/web/core/modules/comment/src/CommentAccessControlHandler.php
@@ -0,0 +1,146 @@
+<?php
+
+namespace Drupal\comment;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Session\AccountInterface;
+
+/**
+ * Defines the access control handler for the comment entity type.
+ *
+ * @see \Drupal\comment\Entity\Comment
+ */
+class CommentAccessControlHandler extends EntityAccessControlHandler {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
+    /** @var \Drupal\comment\CommentInterface|\Drupal\user\EntityOwnerInterface $entity */
+
+    $comment_admin = $account->hasPermission('administer comments');
+    if ($operation == 'approve') {
+      return AccessResult::allowedIf($comment_admin && !$entity->isPublished())
+        ->cachePerPermissions()
+        ->addCacheableDependency($entity);
+    }
+
+    if ($comment_admin) {
+      $access = AccessResult::allowed()->cachePerPermissions();
+      return ($operation != 'view') ? $access : $access->andIf($entity->getCommentedEntity()->access($operation, $account, TRUE));
+    }
+
+    switch ($operation) {
+      case 'view':
+        $access_result = AccessResult::allowedIf($account->hasPermission('access comments') && $entity->isPublished())->cachePerPermissions()->addCacheableDependency($entity)
+          ->andIf($entity->getCommentedEntity()->access($operation, $account, TRUE));
+        if (!$access_result->isAllowed()) {
+          $access_result->setReason("The 'access comments' permission is required and the comment must be published.");
+        }
+
+        return $access_result;
+
+      case 'update':
+        return AccessResult::allowedIf($account->id() && $account->id() == $entity->getOwnerId() && $entity->isPublished() && $account->hasPermission('edit own comments'))->cachePerPermissions()->cachePerUser()->addCacheableDependency($entity);
+
+      default:
+        // No opinion.
+        return AccessResult::neutral()->cachePerPermissions();
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
+    return AccessResult::allowedIfHasPermission($account, 'post comments');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkFieldAccess($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
+    if ($operation == 'edit') {
+      // Only users with the "administer comments" permission can edit
+      // administrative fields.
+      $administrative_fields = [
+        'uid',
+        'status',
+        'created',
+        'date',
+      ];
+      if (in_array($field_definition->getName(), $administrative_fields, TRUE)) {
+        return AccessResult::allowedIfHasPermission($account, 'administer comments');
+      }
+
+      // No user can change read-only fields.
+      $read_only_fields = [
+        'hostname',
+        'changed',
+        'cid',
+        'thread',
+      ];
+      // These fields can be edited during comment creation.
+      $create_only_fields = [
+        'comment_type',
+        'uuid',
+        'entity_id',
+        'entity_type',
+        'field_name',
+        'pid',
+      ];
+      if ($items && ($entity = $items->getEntity()) && $entity->isNew() && in_array($field_definition->getName(), $create_only_fields, TRUE)) {
+        // We are creating a new comment, user can edit create only fields.
+        return AccessResult::allowedIfHasPermission($account, 'post comments')->addCacheableDependency($entity);
+      }
+      // We are editing an existing comment - create only fields are now read
+      // only.
+      $read_only_fields = array_merge($read_only_fields, $create_only_fields);
+      if (in_array($field_definition->getName(), $read_only_fields, TRUE)) {
+        return AccessResult::forbidden();
+      }
+
+      // If the field is configured to accept anonymous contact details - admins
+      // can edit name, homepage and mail. Anonymous users can also fill in the
+      // fields on comment creation.
+      if (in_array($field_definition->getName(), ['name', 'mail', 'homepage'], TRUE)) {
+        if (!$items) {
+          // We cannot make a decision about access to edit these fields if we
+          // don't have any items and therefore cannot determine the Comment
+          // entity. In this case we err on the side of caution and prevent edit
+          // access.
+          return AccessResult::forbidden();
+        }
+        $is_name = $field_definition->getName() === 'name';
+        /** @var \Drupal\comment\CommentInterface $entity */
+        $entity = $items->getEntity();
+        $commented_entity = $entity->getCommentedEntity();
+        $anonymous_contact = $commented_entity->get($entity->getFieldName())->getFieldDefinition()->getSetting('anonymous');
+        $admin_access = AccessResult::allowedIfHasPermission($account, 'administer comments');
+        $anonymous_access = AccessResult::allowedIf($entity->isNew() && $account->isAnonymous() && ($anonymous_contact != COMMENT_ANONYMOUS_MAYNOT_CONTACT || $is_name) && $account->hasPermission('post comments'))
+          ->cachePerPermissions()
+          ->addCacheableDependency($entity)
+          ->addCacheableDependency($field_definition->getConfig($commented_entity->bundle()))
+          ->addCacheableDependency($commented_entity);
+        return $admin_access->orIf($anonymous_access);
+      }
+    }
+
+    if ($operation == 'view') {
+      // Nobody has access to the hostname.
+      if ($field_definition->getName() == 'hostname') {
+        return AccessResult::forbidden();
+      }
+      // The mail field is hidden from non-admins.
+      if ($field_definition->getName() == 'mail') {
+        return AccessResult::allowedIfHasPermission($account, 'administer comments');
+      }
+    }
+    return parent::checkFieldAccess($operation, $field_definition, $account, $items);
+  }
+
+}