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Files can be locked in read-only mode to prevent accidental modification, and all users are familiar with the Are you sure dialog box that pops up when they try to overwrite a file In online, multiuser applications, however, these techniques also take on important defensive roles against unauthorized corruption of data..

In the create method, you can assume that you will receive an object in the form of a hash of name-value pairs. The default name assigned to this argument is create_hash, although since this is just the name of the argument to the method, you can feel free to assign any name to the argument in your implementation. In an inventory-tracking application, the hash returned from the client for a new record might resemble Listing 7 8.

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The easiest way to implement locking in a database-backed application is to add a flag (that is, a column that holds a Boolean value) to indicate when a particular record should be considered locked against changes. Because your goal is to create privilege separation, you might name this column something like adminLock to imply that only administrative users of your application will be able to change its value. For every table on which you want to implement locking, add an adminLock flag, like this (from the MySQL command line): ALTER TABLE sample ADD COLUMN adminLock enum('1','0') DEFAULT '0'; You then need to ensure that every UPDATE or DELETE query in your application respects the adminLock and acts only on records where adminLock is 0 (that is, FALSE). A PHP script fragment that implements this restriction might look like this: < php // ... $query = "UPDATE sample SET field='$safeField' WHERE adminLock = '0' AND id = '$safeId'"; $result = mysql_query( $query ); // ... > The WHERE adminLock = '0' clause in the UPDATE query will keep the sample table from being updated in cases where the record has been locked. Of course, no such restriction will exist in the database. It is up to the developers of the application to pay attention to the flag. In an application that implements this system, the only UPDATE or DELETE query that doesn t include a WHERE adminLock = '0' assertion should be that special UPDATE query that allows an administrator to unlock a record.

Note If the server is a Windows 2003 or later server, BITS is an integrated piece of IIS that may be loaded at the same time. If your server is an older Windows 2000 server, you will need to download the BITS server software from the Microsoft website. Ensure it is the BITS server, not the BITS client. You should be able to find the correct version from http://www.microsoft.com/downloads/details.aspx FamilyID=3ee866a0-3a09-4fdf8bdb-c906850ab9f2&displaylang=en. The current version as of this date of writing is version 2.0.

When we discussed cross-site scripting in 4, we provided several examples of XSS attacks that resulted in the adding of an unwanted item to a user s shopping cart. The problem of keeping an unasked-for item out of a user s cart is similar to preventing the unrequested modification of a database record by a logged-in editor. We demonstrated a number of prevention techniques in that chapter, including filtering such attacks out of user-submitted markup, and expecting certain actions while rejecting the rest. But we didn t discuss there the related technique of requiring confirmation for actions that might be hijacked via XSS to corrupt or destroy data. To recapitulate what an attack of this kind might look like, suppose your Content Management System allows editors to delete off-topic comments from articles. The delete action might be initiated by clicking a link like this: http://cms.example.org/comments.php action=delete&commentID=4321 If the deletion is carried out without any confirmation, then an attacker might place on a web page a series of links disguised as images, something like the following, and entice one of your logged-in editors to visit it: <img src="http://cms.example.org/comments.php action=delete&commentID=4322" /> <img src="http://cms.example.org/comments.php action=delete&commentID=4323" />

Listing 7 8. Create parameter format {"sku"=>"999","name"=>"tire", "brand"=>"Michelin", "price"=>"$49"}

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