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n this chapter I ll look at the security and administration of Nagios, focusing on the security of your web console, the settings and commands used to administer Nagios, and the logging that your Nagios server generates. The security of your Nagios server is important. Your Nagios monitoring environment usually contains a considerable amount of configuration information about your environment, including details of the hosts and services such as IP addresses and running services. This information could prove a boon to an attacker looking for weak points in your environment to compromise. Additionally, securing your Nagios server ensures that it will not be a conduit for an attack. I ll also look at some of the administration functions of your Nagios server, including starting and stopping your server, managing and rotating the log file, and specifying what Nagios will and will not log.

There are a few basic security guidelines that you should be aware of when running a Nagios server. The first guideline is not so much a guideline as a general series of recommendations to harden and secure your host from intruders.1 There are a few keys things you can do that will help with this: Only install the packages and components you require for your host. Any host build should start from your operating system or distribution s minimal build and then add any required packages. Update your systems frequently and ensure any known vulnerabilities are addressed using patching, updates, or workarounds. Tools like apt-get or yum will help with this process. Remove any unneeded users and groups. Also change the passwords of, and preferably lock, any user accounts that do not need to log in. Remember to choose strong passwords and change them on a regular basis. Remove any unnecessary process, daemons, or services. A lot of distributions come with a number of services you probably don t need for example, unless you need NFS you should disable it and any related services.

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The UTF-8 encoding type should be used for all text-based files, as this allows the direct use of extended characters and non-English character sets within the files, without the need for special control characters and ASCII codes. In practice, it is a lot easier to create files in UTF-8 format from the outset, rather than to translate them later. If you need to convert a file from another encoding format to UTF-8, make a backup of the existing file and use your development environment s file properties dialog box to set the format of the document to the appropriate encoding type. This may affect the encoding of certain characters already within the file, so use the backup file to copy and paste the characters from the backup to the newly UTF-8 encoded file. In some cases, the byte-order mark (BOM) at the beginning of a UTF-8 encoded file can cause havoc with server-side technologies such as PHP. When encoding files that are to be processed by such technologies, ensure the BOM is removed using the development environment s file properties dialog box, if this option exists.

However, this does not mean that you can just toss whatever you want at the shadowing support and let Ogre sort it out You should be aware of the various gotchas particular to stencil shadows, in order to be able to optimize your usage of them in your scene Shadow volumes are not affected by occluding geometry This means that you can see shadows on the other side of what should be an occluding object (assuming that the occluding object is not set to cast shadows) Figure 11-5 shows this artifact; notice that the shadow is cast on the floor even though the cube should have blocked it (in the real world, that is) If the cube were instead a wall, and you could see both sides of the wall, then you would see the shadow cast through the wall and affecting objects on the other side as well.

1. I ve written a book specific to securing Linux called Hardening Linux (www.apress.com/book/ bookDisplay.html bID=395), also published by Apress, that may assist with this.

Consider whether placing all static asset files (style sheets, images, scripts, audio, and video), excluding HTML, within a common folder might be worthwhile. This logically separates client-side code from the structure of the site and its content, avoiding clutter at the root level

3/16/06

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