Move session ID check to SessionManager

Relates to https://github.com/shaarli/Shaarli/issues/324

Changed:
- `is_session_id_valid()` -> `SessionManager::checkId()`
- update tests

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

5 files changed, 97 insertions, 90 deletions

diff --git a/application/SessionManager.php b/application/SessionManager.php
index 2083df42..3aa4ddfc 100644
--- a/application/SessionManager.php
+++ b/application/SessionManager.php
@@ -50,4 +50,34 @@ class SessionManager
         unset($this->session['tokens'][$token]);
         return true;
     }
+
+    /**
+     * Validate session ID to prevent Full Path Disclosure.
+     *
+     * See #298.
+     * The session ID's format depends on the hash algorithm set in PHP settings
+     *
+     * @param string $sessionId Session ID
+     *
+     * @return true if valid, false otherwise.
+     *
+     * @see http://php.net/manual/en/function.hash-algos.php
+     * @see http://php.net/manual/en/session.configuration.php
+     */
+    public static function checkId($sessionId)
+    {
+        if (empty($sessionId)) {
+            return false;
+        }
+
+        if (!$sessionId) {
+            return false;
+        }
+
+        if (!preg_match('/^[a-zA-Z0-9,-]{2,128}$/', $sessionId)) {
+            return false;
+        }
+
+        return true;
+    }
 }
diff --git a/application/Utils.php b/application/Utils.php
index 2f38a8de..97b12fcf 100644
--- a/application/Utils.php
+++ b/application/Utils.php
@@ -182,36 +182,6 @@ function generateLocation($referer, $host, $loopTerms = array())
 }
 
 /**
- * Validate session ID to prevent Full Path Disclosure.
- *
- * See #298.
- * The session ID's format depends on the hash algorithm set in PHP settings
- *
- * @param string $sessionId Session ID
- *
- * @return true if valid, false otherwise.
- *
- * @see http://php.net/manual/en/function.hash-algos.php
- * @see http://php.net/manual/en/session.configuration.php
- */
-function is_session_id_valid($sessionId)
-{
-    if (empty($sessionId)) {
-        return false;
-    }
-
-    if (!$sessionId) {
-        return false;
-    }
-
-    if (!preg_match('/^[a-zA-Z0-9,-]{2,128}$/', $sessionId)) {
-        return false;
-    }
-
-    return true;
-}
-
-/**
  * Sniff browser language to set the locale automatically.
  * Note that is may not work on your server if the corresponding locale is not installed.
  *
diff --git a/index.php b/index.php
index 9e698628..e1516d37 100644
--- a/index.php
+++ b/index.php
@@ -116,7 +116,7 @@ if (session_id() == '') {
 }
 
 // Regenerate session ID if invalid or not defined in cookie.
-if (isset($_COOKIE['shaarli']) && !is_session_id_valid($_COOKIE['shaarli'])) {
+if (isset($_COOKIE['shaarli']) && !SessionManager::checkId($_COOKIE['shaarli'])) {
     session_regenerate_id(true);
     $_COOKIE['shaarli'] = session_id();
 }
diff --git a/tests/SessionManagerTest.php b/tests/SessionManagerTest.php
index 3a270303..9fa60dc5 100644
--- a/tests/SessionManagerTest.php
+++ b/tests/SessionManagerTest.php
@@ -1,8 +1,12 @@
 <?php
-namespace Shaarli;
+// Initialize reference data _before_ PHPUnit starts a session
+require_once 'tests/utils/ReferenceSessionIdHashes.php';
+ReferenceSessionIdHashes::genAllHashes();
 
+use \Shaarli\SessionManager;
 use \PHPUnit\Framework\TestCase;
 
+
 /**
  * Fake ConfigManager
  */
@@ -20,6 +24,17 @@ class FakeConfigManager
  */
 class SessionManagerTest extends TestCase
 {
+    // Session ID hashes
+    protected static $sidHashes = null;
+
+    /**
+     * Assign reference data
+     */
+    public static function setUpBeforeClass()
+    {
+        self::$sidHashes = ReferenceSessionIdHashes::getHashes();
+    }
+
     /**
      * Generate a session token
      */
@@ -69,4 +84,54 @@ class SessionManagerTest extends TestCase
 
         $this->assertFalse($sessionManager->checkToken('4dccc3a45ad9d03e5542b90c37d8db6d10f2b38b'));
     }
+
+    /**
+     * Test SessionManager::checkId with a valid ID - TEST ALL THE HASHES!
+     *
+     * This tests extensively covers all hash algorithms / bit representations
+     */
+    public function testIsAnyHashSessionIdValid()
+    {
+        foreach (self::$sidHashes as $algo => $bpcs) {
+            foreach ($bpcs as $bpc => $hash) {
+                $this->assertTrue(SessionManager::checkId($hash));
+            }
+        }
+    }
+
+    /**
+     * Test checkId with a valid ID - SHA-1 hashes
+     */
+    public function testIsSha1SessionIdValid()
+    {
+        $this->assertTrue(SessionManager::checkId(sha1('shaarli')));
+    }
+
+    /**
+     * Test checkId with a valid ID - SHA-256 hashes
+     */
+    public function testIsSha256SessionIdValid()
+    {
+        $this->assertTrue(SessionManager::checkId(hash('sha256', 'shaarli')));
+    }
+
+    /**
+     * Test checkId with a valid ID - SHA-512 hashes
+     */
+    public function testIsSha512SessionIdValid()
+    {
+        $this->assertTrue(SessionManager::checkId(hash('sha512', 'shaarli')));
+    }
+
+    /**
+     * Test checkId with invalid IDs.
+     */
+    public function testIsSessionIdInvalid()
+    {
+        $this->assertFalse(SessionManager::checkId(''));
+        $this->assertFalse(SessionManager::checkId([]));
+        $this->assertFalse(
+            SessionManager::checkId('c0ZqcWF3VFE2NmJBdm1HMVQ0ZHJ3UmZPbTFsNGhkNHI=')
+        );
+    }
 }
diff --git a/tests/UtilsTest.php b/tests/UtilsTest.php
index 840eaf21..6cd37a7a 100644
--- a/tests/UtilsTest.php
+++ b/tests/UtilsTest.php
@@ -5,10 +5,6 @@
 
 require_once 'application/Utils.php';
 require_once 'application/Languages.php';
-require_once 'tests/utils/ReferenceSessionIdHashes.php';
-
-// Initialize reference data before PHPUnit starts a session
-ReferenceSessionIdHashes::genAllHashes();
 
 
 /**
@@ -16,9 +12,6 @@ ReferenceSessionIdHashes::genAllHashes();
  */
 class UtilsTest extends PHPUnit_Framework_TestCase
 {
-    // Session ID hashes
-    protected static $sidHashes = null;
-
     // Log file
     protected static $testLogFile = 'tests.log';
 
@@ -30,13 +23,11 @@ class UtilsTest extends PHPUnit_Framework_TestCase
      */
     protected static $defaultTimeZone;
 
-
     /**
      * Assign reference data
      */
     public static function setUpBeforeClass()
     {
-        self::$sidHashes = ReferenceSessionIdHashes::getHashes();
         self::$defaultTimeZone = date_default_timezone_get();
         // Timezone without DST for test consistency
         date_default_timezone_set('Africa/Nairobi');
@@ -221,57 +212,8 @@ class UtilsTest extends PHPUnit_Framework_TestCase
         $this->assertEquals('?', generateLocation($ref, 'localhost'));
     }
 
-    /**
-     * Test is_session_id_valid with a valid ID - TEST ALL THE HASHES!
-     *
-     * This tests extensively covers all hash algorithms / bit representations
-     */
-    public function testIsAnyHashSessionIdValid()
-    {
-        foreach (self::$sidHashes as $algo => $bpcs) {
-            foreach ($bpcs as $bpc => $hash) {
-                $this->assertTrue(is_session_id_valid($hash));
-            }
-        }
-    }
 
     /**
-     * Test is_session_id_valid with a valid ID - SHA-1 hashes
-     */
-    public function testIsSha1SessionIdValid()
-    {
-        $this->assertTrue(is_session_id_valid(sha1('shaarli')));
-    }
-
-    /**
-     * Test is_session_id_valid with a valid ID - SHA-256 hashes
-     */
-    public function testIsSha256SessionIdValid()
-    {
-        $this->assertTrue(is_session_id_valid(hash('sha256', 'shaarli')));
-    }
-
-    /**
-     * Test is_session_id_valid with a valid ID - SHA-512 hashes
-     */
-    public function testIsSha512SessionIdValid()
-    {
-        $this->assertTrue(is_session_id_valid(hash('sha512', 'shaarli')));
-    }
-
-    /**
-     * Test is_session_id_valid with invalid IDs.
-     */
-    public function testIsSessionIdInvalid()
-    {
-        $this->assertFalse(is_session_id_valid(''));
-        $this->assertFalse(is_session_id_valid(array()));
-        $this->assertFalse(
-            is_session_id_valid('c0ZqcWF3VFE2NmJBdm1HMVQ0ZHJ3UmZPbTFsNGhkNHI=')
-        );
-    }
-    
-    /**
      * Test generateSecretApi.
      */
     public function testGenerateSecretApi()