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Adeos supports three scan modes: normal, verbose, and paranoid. The normal mode scans for setuid and setgid files, world-writable files, and directories. This is the default mode that Adeos will run in if you do not provide a mode on the command line. The next mode is verbose mode, which looks for all the file types in the normal scan mode plus files with the sticky bit set, unreadable directories, and inaccessible files. The last mode, paranoid, is the most detailed and scans for all the types in the normal and verbose modes and adds world-readable and world-executable objects. Let s first run Adeos in the normal mode. Enter the following: puppy$ ./adeos World-writeable file: /var/lib/mysql/mysql.sock World-writeable directory: /var/tmp World-writeable directory: /var/spool/vbox World-writeable directory: /var/spool/samba World-writeable directory: /tmp SUID file: /usr/X11R6/bin/XFree86 SUID file: /usr/sbin/usernetctl ... The adeos command will output a list of files will be outputted. This list may be quite long, and I recommend you redirect the output of the command to a file. This will allow you to better use the results. You can also run Adeos with the -r option to output the results in a report format suitable for printing. Listing 4-12 runs Adeos in verbose mode with the report option enabled. Listing 4-12. Adeos in verbose Report Mode puppy$ ./adeos -r verbose You can also output the results of the Adeos scan as a HTML document using the -h option. Listing 4-13 runs Adeos in paranoid mode with the HTML output option. Listing 4-13. Adeos in paranoid Mode puppy$ ./adeos -h paranoid The -h option will create a HTML file called results.html in the current working directory.

PLINQ is the parallelized version of LINQ to objects and supports all existing LINQ operators and functionality with a few new options for fine-grained control of parallelization functionality. The new functionality has been introduced through the interface IParallelEnumerable<T>> that inherits from IEnumerable<T>>. At the time of writing, LINQ to SQL and LINQ to Entities will not benefit from parallelization because in these cases the query is executed on the database or the provider, so .NET cannot parallelize it.

s Caution Occasionally when running in paranoid mode with the -r option set, Adeos can consume large quantities of memory and significantly slow your system. You should be careful when running Adeos in this mode with this option.

Now I will go back to Listing 4-2 and the seven columns of attributes for the objects. The third and fourth columns are the owner of the object and the group of the object, respectively. In Listing 4-1 the test.sh object is owned by the user bob and belongs to the group sales. The user bob, as the owner, is entitled to the first triplet of access permissions, rwx, as I have described in the previous section, and the group sales is entitled to the second triplet of permissions, r-x. As I stated earlier, everyone on the system has been granted the world permissions, r-x, to the test.sh object. One of the important characteristics of ownership is that all files and objects on your system should have an owner. Unowned objects can often indicate that an attacker has penetrated your system. Listing 4-14 provides a find command that will return all files that do not have an owner or a group. Listing 4-14. Find Unowned Files and Objects puppy# find / -nouser -o -nogroup -ls You should review any files and objects that are unowned by a user or do not belong to a group and either remove them or assign them to the appropriate owner or group.

Immutable files are one of the most powerful security and system administration features available on Linux systems. Immutable files cannot be written to by any user, even by the root user, regardless of their file permissions. They cannot be deleted or renamed, and no hard link can be created from them. They are ideal for securing configuration files or other files to which you want to prevent changes and which you know will not or should not be changed.

Parallelizing LINQ queries automatically is potentially the ultimate goal for LINQ, but it can introduce some issues (particularly around ordering), so at present you have to opt in to the parallel model.

s Note Immutable file functionality is available for ext2 and ext3 type file systems in kernel versions 2.4

and onward on most distributions. The chattr commands and associated functionality is provided by the e2fsprogs package, which is usually installed by default on most Linux systems.

You can add or remove the immutable attribute using the chattr command. Only the root user can use the chattr command to make files immutable. Listing 4-15 makes the /etc/passwd file immutable. This would prevent any new users being created on the system, because new users could not be written to the /etc/passwd file. Listing 4-15. Setting the Immutable Attribute puppy# chattr -V +i /etc/passwd chattr 1.34 (25-Jul-2003) Flags of /etc/passwd set as ----i-------The chattr command is similar in function to the chmod command. Like the chmod command, you specify either a plus (+) sign or minus (-) sign and the required attribute. The plus