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When configuring Apache, pay a great deal of attention to security configuration issues The basic idea is to disable anything you do not use This way, you are taking preventive security measures and are likely to reduce risks

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There are many ways you can configure Apache while enhancing your overall Web security Before you can choose a configuration suitable for you, you need to develop a security policy and then choose a configuration suitable to meet your policy requirements When it comes to security there is always a chance that you can overestimate the risks and become too paranoid or underestimate your security needs and keep things too open In the sections below I discuss a few configurations that suit different environments

Job reservation and service in I-RSVP Table 62 Job information carried in the probe reply packet Information JobID SourceID DestinationID ReservationStatus Description The identi cation number of the job The identi cation of the source node The identi cation of the destination node The status of the temporary reservation: con rm or cancel

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An administrative security policy identifies practices that are vital to achieving robust network security If you do not yet have one, consider adding some of the following items to an administrative security policy as a start

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Log everything: I cannot emphasize this enough The server log files record information on the server s behavior in response to each request Analysis of the log can provide both business information (for instance, which Web pages are most popular) and security information Make sure you set up Apache to log both access and errors With the help of log files you can track who is accessing what Get in the habit of browsing logs whenever you can if you notice anything unusual, take a closer look Your error log is probably the most important log to monitor closely

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For more information on logging, see Logging and Security section later in this chapter and 8 where I describe logging with Apache

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Maintain an authoritative copy of your Web site(s): Keep the authoritative copy of your Web site on a more secure host If the integrity of the public information on your Web server is ever compromised, you need an authoritative copy from which to restore it Typically, the authoritative copy is kept on a host that is accessible to the Web site administrator (and, perhaps, to the people in your organization who are responsible for the creation and maintenance of Web content) It is often kept on the organization s internal network To ensure security, use robust cryptographic-checksum technologies to generate a checksum for each file Keep authoritative copies of files and checksums on write-protected or read-only media stored in a physically secure location You can use MD5 encryption to generate cryptographic checksums for your files Administer your site from the Web host console: You should administer your Web site from the Web host s console Doing this eliminates the need for network traffic between the Web server and the administrator s workstation There are, however, many situations when this is not feasible (such as in organizations in which the Web server is not easily accessed by the administrator) When you must do remote administration, be sure to use a strong authentication scheme to login to the Web server If you use a Web-based administrative tool, make sure it does not use Basic HTTP authentication In other words, you want to make sure the passwords are not traveling from your workstation to the Web server in a nonencrypted format Also, you should configure the Web server system to accept connection from a single host within your internal network Be aware of public domain CGI applications: Whenever using a public domain CGI, make sure you or someone in your organization (or an outside consultant) has complete understanding of the code Never get a copy of an application from a nonauthentic source Search USENET newsgroups to see if anyone has discovered problems with the application that you intend to install on your Web server If possible, install the application in a staging server and test it yourself Keep monitoring your log files during the test period and look for errors and warnings produced by the applications If the application uses mail services, monitor the mail log as well.

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