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For instance, neither the SMB nor the AFP protocol support hard links in default OS X configurations Thus, any collaborative shares presented via these protocols are immune to such hard link attacks Presenting collaborative data via a network protocol isn t always an option however, as sometimes collaboration will need to reside on a local volume Say, for instance, an Xsan volume In such a case, your best form of protection is to first avoid running administrative scripts which globally grant write provisions to files: lay down your file system hierarchy and a good inheritance model from the get-go, thus you can avoid having to run such routines against the data This certainly isn t a complete answer though Another step would be to restrict the user from utilizing tools that can be used create links.

edmx file (which encapsulates model and mapping information) Your objects create and use a model dynamically at runtime This perspective is still in the experimental stage and is available as a Community Technology Preview In this book, we focus on the Database First perspective This perspective is the most widely used and most mature approach Many, if not most, developers in the Entity Framework community find themselves working with existing applications or developing models that are not readily supported by the other perspectives We also have to share a dirty little secret: many existing applications don t exactly use the best database designs Way too often we find ourselves working with databases (of course, created by other less talented developers) that are poorly designed.

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At an extreme level, this would include preventing the user from accessing a shell altogether, as well as access to AppleScript capabilities If the user must absolutely have shell access, an alternative approach would be to utilize OS X sandboxing to restrict access to certain CLI utilities: most notably /bin/ls, but also also interpreted runtimes such as Python, Perl, PHP, or Ruby Utilizing sandbox technology to protect an OS X environment is covered in detail in 6..

Browsers and browser-like applications are sometimes described as thin clients. Their only job is to send data, receive data, and format the results. They do not come with code describing how to play a game, read a patient s medical chart, or draw a map. They might seem to do all those things, but only because the content delivered to the client can do so. Thin clients can have many advantages over their thicker counterparts. Easy Updates: Assuming you have access to the web server, making changes is almost unbelievably easy. Whether you have one user or one million, everyone will see the change the next time their browser launches.

As developers, sometimes in larger organizations with lots of process control, or with lots of fragile legacy code, we can t change the database enough to really fix the design In these cases, we simply have to work with the database design we have..

If you are reading this book we assume you have sensitive data to protect, and if so, you might want to consider routinely auditing your file system permissions Earlier in this chapter, we learned of the dangers that can be had when permissions are poorly applied An inadvertent write mode granted to a directory containing executables means that a malicious user can inject his own, executables, thereby granting him the ability to further exploit your system The suid bit, when granted to an insecure program, can lead to a user subverting the program and gaining complete control of your box If an executable must be suid to function, then there s not much you can do with POSIX or ACL permissions to prevent damage To protect against such a scenario, consider Sandboxing your program, as discussed later on in this book, 6.

Familiarity: People are very comfortable using their browsers, and may trust a browser more than a random app they have installed Cost: You don t need to pay RIM for signature keys Security: The user won t see security prompts or other warnings when they visit your site Consistency across Apps: Users appreciate how pressing Back will always take them back one page, pressing the BlackBerry Menu key will always bring up options for bookmarking and entering a URL, etc Potentially Faster Startup Time: If your app contains a lot of content, it will take a while to load it all into memory On the Web with a fast data connection, users can start using the app as soon as the first page loads You should keep some caveats in mind, especially if you are new to mobile web development.

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