diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index dd6ca13..2a41eab 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -305,7 +305,7 @@ function comment_field_instance_delete(FieldInstanceInterface $instance) {
  * Implements hook_permission().
  */
 function comment_permission() {
-  return array(
+  $permissions = array(
     'administer comments' => array(
       'title' => t('Administer comments and comment settings'),
     ),
@@ -322,6 +322,31 @@ function comment_permission() {
       'title' => t('Edit own comments'),
     ),
   );
+  $manager = \Drupal::service('comment.manager');
+  $fields = $manager->loadFields();
+  foreach ($fields as $field) {
+    if ($field->getFieldSetting('custom_permissions')) {
+      $replacements = array(
+        '@entity_type' => $field->entity_type,
+        '@field_name' => $field->name,
+      );
+      $permissions += array(
+        'access comments ' . $field->id() => array(
+          'title' => t('View comments for the @field_name field on @entity_type', $replacements),
+        ),
+        'post comments ' . $field->id() => array(
+          'title' => t('Post comments for the @field_name field on @entity_type', $replacements),
+        ),
+        'skip comment approval ' . $field->id() => array(
+          'title' => t('Skip comment approval for the @field_name field on @entity_type', $replacements),
+        ),
+        'edit own comments ' . $field->id() => array(
+          'title' => t('Edit own comments for the @field_name field on @entity_type', $replacements),
+        ),
+      );
+    }
+  }
+  return $permissions;
 }
 
 /**
@@ -475,8 +500,10 @@ function comment_entity_view(EntityInterface $entity, EntityDisplay $display, $v
     //   http://drupal.org/node/1901110
     return;
   }
-  $fields = \Drupal::service('comment.manager')->getFields('node');
+  $comment_manager = \Drupal::service('comment.manager');
+  $fields = $comment_manager->getFields('node');
   foreach ($fields as $field_name => $detail) {
+    $field = $comment_manager->loadField($field_name, 'node');
     // Skip fields that entity does not have.
     if (!$entity->getPropertyDefinition($field_name)) {
       continue;
@@ -502,7 +529,7 @@ function comment_entity_view(EntityInterface $entity, EntityDisplay $display, $v
         // Teaser view: display the number of comments that have been posted,
         // or a link to add new comments if the user has permission, the node
         // is open to new comments, and there currently are none.
-        if (user_access('access comments')) {
+        if ($comment_manager->checkPermission('access comments', $field, \Drupal::currentUser())) {
           if (!empty($entity->get($field_name)->comment_count)) {
             $links['comment-comments'] = array(
               'title' => format_plural($entity->get($field_name)->comment_count, '1 comment', '@count comments'),
@@ -529,7 +556,7 @@ function comment_entity_view(EntityInterface $entity, EntityDisplay $display, $v
         // Provide a link to new comment form.
         if ($commenting_status == COMMENT_OPEN) {
           $comment_form_location = $instance->getFieldSetting('form_location');
-          if (user_access('post comments')) {
+          if ($comment_manager->checkPermission('post comments', $field, \Drupal::currentUser())) {
             $links['comment-add'] = array(
               'title' => t('Add new comment'),
               'href' => $uri['path'],
@@ -560,10 +587,11 @@ function comment_entity_view(EntityInterface $entity, EntityDisplay $display, $v
         // indexing or constructing a search result excerpt.
         if ($commenting_status == COMMENT_OPEN) {
           $comment_form_location = $instance->getFieldSetting('form_location');
-          if (user_access('post comments')) {
+          if ($comment_manager->checkPermission('post comments', $field, \Drupal::currentUser())) {
             // Show the "post comment" link if the form is on another page, or
             // if there are existing comments that the link will skip past.
-            if ($comment_form_location == COMMENT_FORM_SEPARATE_PAGE || (!empty($entity->get($field_name)->comment_count) && user_access('access comments'))) {
+            if ($comment_form_location == COMMENT_FORM_SEPARATE_PAGE || (!empty($entity->get($field_name)->comment_count) &&
+                $comment_manager->checkPermission('access comments', $field, \Drupal::currentUser()) {
               $links['comment-add'] = array(
                 'title' => t('Add new comment'),
                 'attributes' => array('title' => t('Share your thoughts and opinions related to this posting.')),
@@ -1134,7 +1162,8 @@ function comment_update_index() {
  * results.
  */
 function comment_node_search_result(EntityInterface $node) {
-  $comment_fields = \Drupal::service('comment.manager')->getFields('node');
+  $comment_manager = \Drupal::service('comment.manager');
+  $comment_fields = $comment_manager->getFields('node');
   $comments = 0;
   $open = FALSE;
   foreach ($comment_fields as $field_name => $info) {
@@ -1142,9 +1171,10 @@ function comment_node_search_result(EntityInterface $node) {
     if (!$node->getPropertyDefinition($field_name)) {
       continue;
     }
+    $field = $comment_manager->loadField($field_name, 'node');
     // Do not make a string if comments are hidden.
     $status = $node->get($field_name)->status;
-    if (\Drupal::currentUser()->hasPermission('access comments') && $status != COMMENT_HIDDEN) {
+    if ($comment_manager->checkPermission('access comments', $field, \Drupal::currentUser()) && $status != COMMENT_HIDDEN) {
       if ($status == COMMENT_OPEN) {
         // At least one comment field is open.
         $open = TRUE;
@@ -1735,6 +1765,7 @@ function comment_ranking() {
  */
 function comment_file_download_access($field, EntityInterface $entity, FileInterface $file) {
   if ($entity->entityType() == 'comment') {
+    // @todo - How to evaluate custom permissions here?
     if (user_access('access comments') && $entity->status->value == COMMENT_PUBLISHED || user_access('administer comments')) {
       $commented_entity = entity_load($entity->entity_type->value, $entity->entity_id->value);
       // Check access to parent entity.
diff --git a/core/modules/comment/lib/Drupal/comment/CommentManager.php b/core/modules/comment/lib/Drupal/comment/CommentManager.php
index 5454a1b..12a12da 100644
--- a/core/modules/comment/lib/Drupal/comment/CommentManager.php
+++ b/core/modules/comment/lib/Drupal/comment/CommentManager.php
@@ -8,8 +8,10 @@
 namespace Drupal\comment;
 
 use Drupal\Component\Utility\String;
+use Drupal\field\Entity\Field;
 use Drupal\field\FieldInfo;
 use Drupal\Core\Entity\EntityManager;
+use Drupal\Core\Session\AccountInterface;
 
 /**
  * Comment manager contains common functions to manage comment fields.
@@ -199,4 +201,39 @@ public function getFieldUIPageTitle($field_name) {
     return String::checkPlain($sample_instance->label);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function checkPermission($permission, Field $field, AccountInterface $account) {
+    if ($field->getFieldSetting('custom_permissions')) {
+      $permission .= ' ' . $field->id();
+    }
+    return $account->hasPermission($permission);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function loadField($field_name, $entity_type) {
+    // We don't bother with static caching as it is present in the storage
+    // controller.
+    return $this->entityManager->getStorageController('field_entity')->loadMultiple("$entity_type.$field_name");
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function loadFields() {
+    $field_ids = array();
+    foreach ($this->getAllFields() as $entity_type => $fields) {
+      foreach (array_keys($fields) as $field_name) {
+        $field_ids [] = "$entity_type.$field_name";
+      }
+    }
+    // We don't bother with static caching as it is present in the storage
+    // controller.
+    $fields = $this->entityManager->getStorageController('field_entity')->loadMultiple($field_ids);
+    return $fields;
+  }
+
 }
diff --git a/core/modules/comment/lib/Drupal/comment/CommentManagerInterface.php b/core/modules/comment/lib/Drupal/comment/CommentManagerInterface.php
index b4c16e3..7b4fe07 100644
--- a/core/modules/comment/lib/Drupal/comment/CommentManagerInterface.php
+++ b/core/modules/comment/lib/Drupal/comment/CommentManagerInterface.php
@@ -7,6 +7,9 @@
 
 namespace Drupal\comment;
 
+use Drupal\Core\Session\AccountInterface;
+use Drupal\field\Entity\Field;
+
 /**
  * Comment manager contains common functions to manage comment fields.
  */
@@ -46,6 +49,25 @@ public function getFields($entity_type = NULL);
   public function getAllFields();
 
   /**
+   * Utility function to return field entities.
+   *
+   * @return \Drupal\field\Entity\Field[]
+   */
+  public function loadFields();
+
+  /**
+   * Utility function to return a field entity.
+   *
+   * @param string $field_name
+   *   The comment field to load.
+   * @param string $entity_type
+   *   The entity type the field is attached to.
+   *
+   * @return \Drupal\field\Entity\Field
+   */
+  public function loadField($field_name, $entity_type);
+
+  /**
    * Utility method to add the default comment field to an entity.
    *
    * Attaches a comment field named 'comment' to the given entity type and
@@ -84,4 +106,21 @@ public function addBodyField($entity_type, $field_name);
    */
   public function getFieldUIPageTitle($field_name);
 
+  /**
+   * Utility function to check permission for a given comment field.
+   *
+   * Comment permissions depend on whether the field has been configured for
+   * custom permissions or not. If a field requires custom permissions then this
+   * utility checks if the custom permission is granted. If the field does not
+   * require custom permissions then the generic ones are used instead.
+   *
+   * @param string $permission
+   *   The permission to check for, eg. 'post comments'.
+   * @param \Drupal\field\Entity\Field $field
+   *   The field for which the comment permission is being checked.
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The user account being tested.
+   */
+   public function checkPermission($permission, Field $field, AccountInterface $account);
+
 }
diff --git a/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php b/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php
index 1c2ffa9..7318d27 100644
--- a/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php
+++ b/core/modules/comment/lib/Drupal/comment/Controller/CommentController.php
@@ -241,13 +241,14 @@ public function getReplyForm(Request $request, $entity_type, $entity_id, $field_
     if (empty($fields[$field_name]) || !($entity = $this->entityManager()->getStorageController($entity_type)->load($entity_id))) {
       throw new NotFoundHttpException();
     }
+    $field = $this->entityManager()->getStorageController('field_entity')->load("$entity_type.$field_name");
 
     $account = $this->currentUser();
     $uri = $entity->uri();
     $build = array();
 
     // Check if the user has the proper permissions.
-    if (!$account->hasPermission('post comments')) {
+    if (!$this->commentManager->checkPermission('post comments', $field, $account)) {
       drupal_set_message($this->t('You are not authorized to post comments.'), 'error');
       return new RedirectResponse($this->urlGenerator()->generateFromPath($uri['path'], array('absolute' => TRUE)));
     }
@@ -263,7 +264,7 @@ public function getReplyForm(Request $request, $entity_type, $entity_id, $field_
       // $pid indicates that this is a reply to a comment.
       if ($pid) {
         // Check if the user has the proper permissions.
-        if (!$account->hasPermission('access comments')) {
+        if (!$this->commentManager->checkPermission('access comments', $field, $account)) {
           drupal_set_message($this->t('You are not authorized to view comments.'), 'error');
           return new RedirectResponse($this->urlGenerator()->generateFromPath($uri['path'], array('absolute' => TRUE)));
         }
diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/field/field_type/CommentItem.php b/core/modules/comment/lib/Drupal/comment/Plugin/field/field_type/CommentItem.php
index 0ffcae8..75a0ff4 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/field/field_type/CommentItem.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/field/field_type/CommentItem.php
@@ -25,6 +25,9 @@
  *     "subject" = 1,
  *     "preview" = DRUPAL_OPTIONAL,
  *   },
+ *   settings = {
+ *     "custom_permissions" = 0,
+ *   },
  *   default_widget = "comment_default",
  *   default_formatter = "comment_default"
  * )
@@ -212,4 +215,17 @@ public static function processSettingsElement($element) {
     return $element;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, array &$form_state, $has_data) {
+    $element = array();
+    $element['custom_permissions'] = array(
+      '#title' => t('Use custom permissions'),
+      '#description' => t('Create custom permissions for this comment field'),
+      '#default_value' => $this->getFieldSetting('custom_permissions'),
+    );
+    return $element;
+  }
+
 }