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n the past few chapters I have covered basic operating system security, firewalls, and the security of your connections In this chapter I will cover the security of your data itself the files and file systems that hold both user data and the files and objects used by the kernel, your operating systems, and your applications Your file systems and the files and objects stored on them are your system s assets The data contained on these assets is often the ultimate target of attackers who have the intention of stealing, tampering with, or destroying them Attacks on your files and file systems come in a number of forms They can take the form of vulnerabilities and exploits of applications, tools, or the kernel These vulnerabilities and exploits take advantage of security weaknesses or idiosyncrasies in Linux s implementation of files and file systems.

Or they can take advantage of the functionality of your file attributes, for example, through the malicious exploitation of setuid or setgid binaries They can also occur because attackers are able to circumvent your system security through inappropriately set permissions or poorly managed or administered files and file systems I will take you through a series of explanations of various facets of file and file system security First, I will run through some basic permission and file attributes concepts This will include looking at some file attributes such as object ownership, setuid, and world-writable permissions that could potentially offer attackers opportunities or leverage on your system Second, I will cover setting a secure umask for your system Additionally, I will cover some ways of protecting the files on your system, including making them immutable and encrypting them.

I take the same approach to addressing file systems by covering individual security-related items such as securely mounting file systems, encrypting file systems, and using tools such as Tripwire This chapter is not a detailed examination of how Linux and other Unix dialects files and file systems work but rather covers security-related features, highlights areas of potential security risk that result from certain types of file attributes, and covers some file and file-specific security enhancements, tools, and functions that can assist you in securing your files..

Now add the following code to define the class: public class Film : TableServiceEntity { public int FilmID { get; set; } public string Title {get; set; } }

s Note One significant area I have not covered is access control lists (ACLs). ACLs allow more advanced file permissions to be applied to your files and objects. ACL access frameworks provide more granular permissions to objects, for example, granting multiple users and groups varying permission to a particular object. I have not discussed ACLs because at this stage of their development, there are too many varying approaches for different types of file systems and for different distributions to provide a simple and accurate explanation of ACLs. I have included some URLs in the Resources section that will provide more information on ACLs.

Each file or object on a Linux system has a number of attributes including the type of object, its ownership, the permissions users and groups have been granted to it, its size, and so on. If you list the contents of a directory using the ls command, you can see all of these attributes. In Listing 4-1 I have used the ls command with the options l and a to display in a long listing format all file attributes. Listing 4-1. Listing a File puppy$ ls -la * -rwxr-xr-x 2

2 01:14

Open Default.aspx.cs and add the following using statements: using Microsoft.WindowsAzure; using Microsoft.WindowsAzure.ServiceRuntime; using Microsoft.WindowsAzure.StorageClient;

I will briefly touch on each of the attributes of objects on Linux systems. As you can see in Listing 4-1, the attributes are divided into seven columns. Listing 4-2 shows these seven columns. Listing 4-2. File Attributes 1 permissions 2 file entries 3 owner 4 group 5 size 6 date/time 7 object name

The first column indicates the permissions of the file or object. These are probably the most important attributes of a file or object. The second column indicates the number of file entries. This applies to directories and indicates how many files are contained in a directory. If the file is an ordinary file, then the file entry will be 1. The third and fourth columns indicate the owner and group to which the file or object is assigned. Of these remaining file attributes, you will most closely be examining the first column of permissions and the third and fourth columns on ownership. The fifth, sixth, and seventh columns, respectively, indicate the size of the object in bytes, the date and time of the last modification of the object, and the name of the object. These attributes are self-explanatory, so I will not cover them in any detail.