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Essential PHP Security 'Store Session Data in a MySQL Database'  how to impliment

Posted on 2008-06-18
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Last Modified: 2013-12-12
Hiya, I asked about this script previous but decide to cut it short. Change my mind again and wish to impliment and understand it fully.

I understand most of how it works within itself its all DB query and comparing the data to make sure it matches, in short anyway.

But how do I actually implement it throughout my site?
Each function has RETURN. Do I simply call the function before something like an IF statement.
And what about my existing login? Do I call the _open() function before or during the query to check the username and password.

Suppose a lot to yet understand so anything you think can help me get started understand this
be good thanks loads
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Question by:Ryan Bayne
6 Comments
 
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Expert Comment

by:ray-solomon
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Before you start coding, you really should read more to understand it better.
http://phpsec.org/php-security-guide.pdf
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Expert Comment

by:Tchuki
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A basic implementation could be:

" session id captured if/when login is successful (modification of your current login probably required)
" session id is stored in a database table (possibly with the session id and a timestamp)
" session id stored in a cookie on the client
" each time a "members" page is accessed, the session id is retrieved from the database and compared to that from the cookie
" upon a successful match the timestamp in the database is updated
" upon an unsuccessful match or the timestamp being greater than 1 hour (for example) session data is deleted from the database, cookie is deleted and user informed accordingly

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Author Comment

by:Ryan Bayne
Comment Utility
ray-solomon I've looked over most of that already. I have used a lot of what is suggests but I still have no idea where I put _close() and _write() and theres nothing else that seems to explain that. Basically I'm not sure how you bring it all together

Tchuki i was to try and code your steps from what I'm thinking just now I'd have some script such as what I already use for security and sessions then a function is called...



1. session id captured if/when login is successful (modification of your current login probably required)

       function _open()  so my own current login checking POST data with DB data and say setting $auth = 'yes';  on success. 
 

Then do I use _write();
 

2.  session id is stored in a database table (possibly with the session id and a timestamp)

       function _write($id, $data)
 

3.  session id stored in a cookie on the client

            My own implentation of setting the cookie
 

4.  each time a "members" page is accessed, the session id is retrieved from the database and compared to that from the cookie

         _read($id)  and then compare the return with what I find in the cookie 
 

5. upon a successful match the timestamp in the database is updated

         _write($id, $data)    after I'm thinking an IF statement is run regarding outcome
 

6. upon an unsuccessful match or the timestamp being greater than 1 hour (for example) session data is deleted from the database, cookie is deleted and user informed accordingly

             part of the previous IF statement but different outcome

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Tchuki earned 500 total points
Comment Utility
Below is a quick example of how it could be implemented:
<?PHP
 

/*

 *	Create a new session

 *	@param	

 *	@return void

 *

 */

function session_new ( )

{
 

	// perform your user validation here or call the function after validation

	$_SESSION['IN_PF'] = $user_id;

	$s_id = session_id();

	

	$new_session = mysql_query ( "INSERT INTO session (session_id, session_user, session_start) 

										VALUES ('$s_id', '$user_id', '$start')" );

	setcookie ( 'website', $s_id, time() + 3600 );
 

}
 

/*

 *	Check that a session is valid

 *	@param	

 *	@return mixed

 *

 */

function session_check ( )

{

	

	session_clean ( );

	

	if ( $_SESSION['IN'] )

	{

	

		$user_id = $_SESSION['IN'];

		

		$fetch_session = mysql_query ( "SELECT *

												FROM session

												WHERE session_user = '$user_id'" );

	

		$session = mysql_fetch_assoc ( $fetch_session );

		

		$session_id = $session['session_id'];

		$session_user = $session['session_user'];

		

		if ( $session_user !== $_SESSION['IN'] )

		{

			$session_errors[] = 'Invalid user id';

		}

		

		if ( $session_id !== $_COOKIE['website'] )

		{

			$session_errors[] = 'Invalid session id';

		}

		

	} else {

		

		$session_errors[] = 'No session started';

	}

	

	if ( !$session_errors )

	{

		session_update ( );

		return true;

	} else {

		return $session_errors;

	}
 

}
 

/*

 *	Update database as user moves around the website

 *	@param	

 *	@return void

 *

 */

function session_update ( )

{
 

	$time = time();

	$user_id = $_SESSION['IN'];

	

	$update_session = mysql_query ( "UPDATE session

											SET session_start = '$time'

											WHERE session_user = '$user_id'" );
 

}
 

/*

 *	Clean session data

 *	@param	

 *	@return void

 *

 */

function session_clean ( )

{
 

	$time = time()-3600;

	

	$fetch_sessions = mysql_query ( "DELETE

											FROM session

											WHERE session_start < '$time'" );
 

}
 

/*

 *	Destroy all session/cookie data

 *	@param	

 *	@return void

 *

 */

function session_kill ( )

{

	

	$user_id = $_SESSION['IN'];

	

	$remove_session = mysql_query ( "DELETE

											FROM session

											WHERE session_user = '$user_id'" );

	

	session_destroy();

	setcookie ( 'website', '', time()-(3600) );
 

}
 

?>

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Expert Comment

by:Loganathan Natarajan
Comment Utility
Hi,
please have a look at this article,

http://www.sitepoint.com/article/users-php-sessions-mysql

they have explained how to use session with login and implement..

hope this helps

also, http://www.sitepoint.com/blogs/2004/03/03/notes-on-php-session-security/
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Author Comment

by:Ryan Bayne
Comment Utility
Tchuk I understand that script better BUT the script I showed a link to doesnt seem to come into play am I right?!  It looks like just another version of

session_set_save_handler('_open',
                         '_close',
                         '_read',
                         '_write',
                         '_destroy',
                         '_clean');

Whatever, it looks like I could use your script as it is or atleast adapt it to my site a lot easier than what I was looking at already and I'm understanding it all more. Especially how I went to sleep for a bit lol

Thanks
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