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One common issue faced with file system security is related to a low level file system capability known as hard links. A hard link in generic terms is a legal occurrence of the same file on a file system in multiple directories. When created, a hard link serves simply as a reference to an existing file, and the link maintains the exact same attributes as its source file. Thus, if ownership, mode, or even the containing data is changed on a link, those exact same changes will be realized on the source file. In OS X, and indeed most POSIX-compliant systems supporting hard links, a user can create a hard link to any file to which they have read access, as long as they have write access to the destination that they specify, and that destination resides on the same file system as the source file. As in most default OS X environments a user will have at least some file system path to which they have write access, this can present a fairly significant security issue. For instance, consider a user who logs into a system and has a local home directory on that system. Next, consider all of the various system configuration files, which have world-readable access (hint, take a look at /etc/). Through the use of hard linking, a user with a shell account and a home directory can potentially exploit any of these worldreadable files. To do so, they simply create a hard link to the file in their own home directory, using the ln command as shown here:

Smart tags are often used as starting points to initiate IBF pipelines. In this exercise, you will build a smart tag recognizer that works with the IBF pipeline you built in Exercise 5-1. This smart tag will recognize author names when you type them into a document and call the default IBF action handler to initiate the pipeline. Before you begin this exercise, be sure that you have completed Exercise 5-1 and that you have installed the Smart Tag SDK.

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Once the database table is created, its time to create a Flex project that supports a PHP application server. Figures 12-6 and 12-7 show snapshots of the New Flex Project Creation Wizard. We call our project DatabaseDrivenSampleApplication. Figure 12-7 shows how the web root and root URL for the PHP application are specified. It s possible to validate this configuration before moving forward. Validation can be done with a single click of the button labeled Validate Configuration. Errors will be thrown if the web server configurations are not correct.

In this particular case, the user is creating a hardlink of the file /etc/crontab in their Dropbox folder. This folder is chosen specifically, as historically it has proven to be handled insecurely by system administrators who do not fully understand how to manage POSIX or ACL permissions. In some cases, to promote collaboration, administrators will run scheduled scripts to change ownership on a directory. After all, user Leroy needs to be able to modify all files in his drop box, so why not just routinely make him the owner of everything added to this folder Well, as we can see if we have a hard link in that folder, suddenly that routine script isn t quite so innocuous: with the linked file present in this directory, it will too be affected by the ownership change. Due to the fact that, as we learned, hard link files share all file attributes, the net result is that the crontab file at /etc/crontab will now have the ownership changes applied to it as well. Suddenly this user has the ability to modify our crontab files, which means they have the ability to create schedule tasks that can operate under any user of their choosing, including root. Combine the privilege change with the fact that cron does no ownership checks on the file, the net result is that the user now has complete access to the system, a major compromise.

Figure 12-7. New Flex Project Creation Wizard, second screen This newly created Flex project will be the target for the database-driven application. To invoke the wizard to create an application from a database, you choose Data Connect to PHP, as shown in Figure 16-8.

Figure 12-8. Choose Connect to PHP from the Data menu On the next screen, your wizard brings you to the page that lets you configure a PHP service. This allows you to choose a PHP service class that can be configured as a service endpoint and be bound to a Flex

NOTE: Although typical OS X command line tools do not allow for creating hard links of directories, the OS does support it, and thus users can use lower level tools such as Python or Perl to create hard links to attack entire directories in a similar fashion So, how do we defend against such an attack Well, one key thing to know is that hard links can only be created when the source and the destination reside on the same volume Thus, a very easy measure to ensure system stability against hard link attacks is to ensure the separation of system data and user data via separate file systems That is: if the users directory does not reside on the same file system as system data, then they will be unable to create a hard link to a system configuration file.

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