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s Caution As the named group has read permissions to the files in your chroot jail, you should ensure

Finally, change the attributes on the localtime file to make it immutable to prevent the time from being changed. kitten# chattr +i /chroot/named/etc/localtime It is especially important to ensure that you carefully secure your configuration and zone files. I recommend using a tool such as Tripwire (see 4) to monitor these files. Additionally, another potential file to consider making immutable is your named.conf file, which contains your BIND configuration. This can inconvenience the process of administering your BIND server but adds a greater level of assurance that your configuration file cannot be changed for malicious purposes. kitten# chattr +i /chroot/named/etc/named.conf

sTip You should also update your permissions on a regular basis to ensure they remain correct and that any

Enter the following code in the Main() method: //Read a memory mapped file using (MemoryMappedFile MemoryMappedFile = MemoryMappedFile.OpenExisting("test")) { using (MemoryMappedViewStream Stream = MemoryMappedFile.CreateViewStream()) { BinaryReader reader = new BinaryReader(Stream); Console.WriteLine(reader.ReadString()); } Console.ReadKey(); }

new files for example, new zone files receive the correct ownership and permissions. I generally do this when the named daemon is started and stopped by adding a section resetting permissions to the defaults in my init script.

To use BIND, you need to start the named daemon. You can do this by running the named binary. When the named binary is executed without options, it will bind the ports it requires, read in

the configuration from the configuration file (which it expects to find in /etc/named.conf), and then daemonize.

You have to run both projects to demonstrate memory mapped files. First, right-click the project 4.MemoryMappedCreate and select Debug Start new instance. A new memory mapped file will be created and a string written to it. Right-click the project 4.MemoryMappedRead and select Debug Start new instance. You should see the string hello memory mapped file! read and printed from the other project.

You can start the named binary on the command line or via an init script. Most of the packages available for BIND on various distributions come with an init script. If you have installed from source, you can extract one of these init scripts from a package and customize it for your own environment. You could also write your own script or get an init script from the Web.12

On Red Hat systems2 when non-root users log into the console, they are granted access to some additional programs that they would otherwise not be able to run. Additionally, they are given permissions to certain files they would not have as normal users solely because they are logged onto the console. To achieve this, Red Hat uses a PAM module called pam_console.so, which is defined in the PAM login service. See the Pluggable Authentication Modules (PAM) section.

The Address Block command opens a dialog box so you can identify the address elements you want to include. The Address Block pulls required data from fields in the data source, such as recipient s name, company name, postal address, and more (see Figure 8-7).

s If more than one non-root user is logged onto console, the first user to log in gets the right to run Tip

The other main use of memory mapped files is for working with very large files. For an example, please refer to this MSDN article: http://msdn.microsoft.com/enus/library/system.io.memorymappedfiles.memorymappedfile(VS.100).aspx.