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Simon

Wed Oct 24 2007, 01:27AM

Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549

Uzzors wrote ...

Your simple fix prevents that from happening too, c4r0, I think I'm going to have to rename my files and employ it. Who knows what else might turn up!

That's the right kind of attitude. When people point out issues like that, they're really saying, "Your site is abusable enough for this to happen," instead of, "Here's a specific bug to fix," which is what many people read it as, unfortunately.

First off, I'll say I'd do what Matt suggested (far less breakable), but if I were to go along with how you're doing things, I'd have the code strip all non-alphanumeric characters from the input before using it. (It's some time since I've coded PHP but there should be a command similar to AWK's gsub.) Then I'd have the code check against a limited list of allowed pages to load. (An associative array could do this nicely.)

A fundamental security commandment is, "Thou shalt not execute user input." Doing an include on a user inputed string is equivalent to executing arbitrary user input. (This is one reason why I'd prefer Matt's method.) Putting the input through an associative array means only internally generated strings are executed.

krenshala

Sat Jan 05 2008, 02:00AM

Registered Member #143 Joined: Sat Feb 11 2006, 04:25PM
Location: Austin TX, NorAm, Sol III
Posts: 28

I know its been a while since anyone posted to this thread, but since I did my website in PHP I thought I'd share some helpful info.

First of all, you guys might want to use require_once() instead of include() to add files to the page. This way, you only include a particular file one time, even if you call it specifically more than once accidentally (e.g., one particular article).

For testing to see if a particular file is there, use file_exists() in an if statement. I did this for the site I made for my son. Index.php includes a "body" file. Page0.php is the default "main" page, and the pages increment from there. I use numbered pages because I wrote a "prev -- main -- next" auto-link function for it so you can go to any page from main, or go to the next/prev page from the page you are currently on. It checks to see if next page exists, and if it doesn't then "next" is not a link (i got tired of changing the max page count variable every time my wife added a new page ;).

<?php
/* pre-header and header code */

/* variables */
$path = "/var/www/localhost/htdocs";

$page = $_GET['page'];
if( !is_numeric( $page ) ) $page = 0;
/* database */
---  snippage of db calls and doctype/head content ---
<body>
  <div class='title'>k i e r o n ' s   s i t e</div>
<?php require_once( $path . "/menu.php" ); ?>
  <div class='main-page'>
<?php
  $p = $page - 1;
  $n = $page + 1;
  $main = "main"; $prev = "prev"; $next = "next";
  if( $page != 0 )
    $main = "<a href='/kieron.php?page=0'>main</a>";
  if( $page > 1 )
    $prev = "<a href='/kieron.php?page=$p'>prev</a>";
  if( file_exists( "$path/kieron/page$n.php" ) )
    $next = "<a href='/kieron.php?page=$n'>next</a>";
  echo "    <div class='menu-pick'><img src='/img/prev.png' /> $prev "
     . "â€” $main â€” $next <img src='/img/next.png' /></div>\n";
  require_once( "$path/kieron/page$page.php" );
  echo "    <div class='menu-pick'><img src='/img/prev.png' /> $prev "
     . "â€” $main â€” $next <img src='/img/next.png' /></div>\n";
?>
  </div>
<?php require_once( "$path/foot.php" ); ?>
</body>
</html>

hmmm ... this editor is adding ; before all the < symbols in the code instead of converting them to <.

I set $path to the full filepath for the site at the top to keep the require_once() function calls short enough for one line. menu- and foot.php are both static files used on every page, while pageN.php (where N is the number) are the pages only used for this particular site.

I'm using style sheets (CSS2.1) to do the layout (title at top, menu on the right, main body left of the menu). Check out the Position is Everything website for some good tips.

Oh, and I use vim (CLI text editor) on my linux box (I run my own server) and vim for windows on the XP gaming machine. ;)

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