CCrmUserFieldRestProxy::checkReadPermission

protected function checkReadPermission()
{
	//Check only entity read permission to allow non-administrator users to call crm.*.userfield.get, crm.*.userfield.list
	return \Bitrix\Crm\Security\EntityAuthorization::checkReadPermission(
		$this->ownerTypeID,
		0,
		CCrmPerms::GetUserPermissions($this->user->GetID())
	);
}