NEW Option for secure "remember me" cookie

Fixes #8234

docs/en/02_Developer_Guides/09_Security/04_Secure_Coding.md

@@ -705,6 +705,20 @@ SilverStripe\Control\Session:
   cookie_secure: true
 ```
 
+The same treatment should be applied to the cookie responsible for remembering logins across sessions:
+
+```yml
+---
+Name: secure-alc
+Except:
+  environment: dev
+---
+SilverStripe\Core\Injector\Injector:
+  SilverStripe\Security\MemberAuthenticator\CookieAuthenticationHandler:
+    properties:
+      TokenCookieSecure: true
+```
+
 For other cookies set by your application we should also ensure the users are provided with secure cookies by setting 
 the "Secure" and "HTTPOnly" flags. These flags prevent them from being stolen by an attacker through javascript. 
 

src/Security/MemberAuthenticator/CookieAuthenticationHandler.php

@@ -27,6 +27,11 @@ class CookieAuthenticationHandler implements AuthenticationHandler
      */
     private $tokenCookieName;
 
+    /**
+     * @var boolean
+     */
+    private $tokenCookieSecure = false;
+
     /**
      * @var IdentityStore
      */
@@ -76,6 +81,28 @@ class CookieAuthenticationHandler implements AuthenticationHandler
         return $this;
     }
 
+    /**
+     * Get the name of the cookie used to store an login token
+     *
+     * @return string
+     */
+    public function getTokenCookieSecure()
+    {
+        return $this->tokenCookieSecure;
+    }
+
+    /**
+     * Set cookie with HTTPS only flag
+     *
+     * @param string $tokenCookieSecure
+     * @return $this
+     */
+    public function setTokenCookieSecure($tokenCookieSecure)
+    {
+        $this->tokenCookieSecure = $tokenCookieSecure;
+        return $this;
+    }
+
     /**
      * Once a member is found by authenticateRequest() pass it to this identity store
      *
@@ -128,11 +155,11 @@ class CookieAuthenticationHandler implements AuthenticationHandler
 
         /** @var RememberLoginHash $rememberLoginHash */
         $rememberLoginHash = RememberLoginHash::get()
-            ->filter(array(
+            ->filter([
                 'MemberID' => $member->ID,
                 'DeviceID' => $deviceID,
-                'Hash'     => $hash
-            ))->first();
+                'Hash' => $hash,
+            ])->first();
         if (!$rememberLoginHash) {
             return null;
         }
@@ -189,13 +216,14 @@ class CookieAuthenticationHandler implements AuthenticationHandler
             $rememberLoginHash = RememberLoginHash::generate($member);
             $tokenExpiryDays = RememberLoginHash::config()->uninherited('token_expiry_days');
             $deviceExpiryDays = RememberLoginHash::config()->uninherited('device_expiry_days');
+            $secure = $this->getTokenCookieSecure();
             Cookie::set(
                 $this->getTokenCookieName(),
                 $member->ID . ':' . $rememberLoginHash->getToken(),
                 $tokenExpiryDays,
                 null,
                 null,
-                null,
+                $secure,
                 true
             );
             Cookie::set(
@@ -204,7 +232,7 @@ class CookieAuthenticationHandler implements AuthenticationHandler
                 $deviceExpiryDays,
                 null,
                 null,
-                null,
+                $secure,
                 true
             );
         } else {
@@ -220,7 +248,7 @@ class CookieAuthenticationHandler implements AuthenticationHandler
     {
         $member = Security::getCurrentUser();
         if ($member) {
-            RememberLoginHash::clear($member, Cookie::get('alc_device'));
+            RememberLoginHash::clear($member, Cookie::get($this->getDeviceCookieName()));
         }
         $this->clearCookies();
 
@@ -236,9 +264,10 @@ class CookieAuthenticationHandler implements AuthenticationHandler
      */
     protected function clearCookies()
     {
-        Cookie::set($this->getTokenCookieName(), null);
-        Cookie::set($this->getDeviceCookieName(), null);
-        Cookie::force_expiry($this->getTokenCookieName());
-        Cookie::force_expiry($this->getDeviceCookieName());
+        $secure = $this->getTokenCookieSecure();
+        Cookie::set($this->getTokenCookieName(), null, null, null, null, $secure);
+        Cookie::set($this->getDeviceCookieName(), null, null, null, null, $secure);
+        Cookie::force_expiry($this->getTokenCookieName(), null, null, null, null, $secure);
+        Cookie::force_expiry($this->getDeviceCookieName(), null, null, null, null, $secure);
     }
 }