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As your system changes over time, you may want to add or remove files that you want to have monitored by Tripwire. The situation becomes aggravated as you install and remove software, adding files not covered by Tripwire and removing those that no longer exist. Tripwire will report any removed files as violations. You can easily add or remove files that Tripwire monitors by inserting or deleting entries in the Tripwire policy file. You can also change the level of checking for different files. You do not edit the Tripwire policy file directly. Instead you edit the text version, /etc/tripwire/twpol.txt. If you are removing missing file entries, it is advisable to just comment them out. If you later install the software for them, you will just have to remove the comment. For example, to remove the entries for innd (the INN news server) and for tux (the Tux Web server), just insert a # symbol before their entry as shown here:
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# /var/lock/subsys/innd -> $(SEC_CONFIG) ; # /var/lock/subsys/tux -> $(SEC_CONFIG) ;
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Once you have made your changes, you issue the following command to generate a new signed tw.pol policy file that Tripwire will actually use. Be sure to specify the text version you are using.
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twadmin --create-polfile /etc/tripwire/twpol.txt
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You will then be prompted to enter the site key. A new tw.pol file is then generated. You will then have to regenerate a new version of the Tripwire database. First remove the old one, and then initialize a new one:
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rm /var/lib/tripwire/turtle.mytrek.com.twd tripwire --init
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Alternatively, you can combine the process by using the tripwire command with the -update-policy option to create your policy and update your database:
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tripwire --update-policy /etc/tripwire/twpol.txt
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The process of setting up and maintaining a firewall can be complex. To simplify the process, you can use a firewall configuration tool, such as lokkit. lokkit provides a configuration interface for maintaining simple firewall rules. With lokkit, you can select the level of firewall protection as High, Medium, or None (see Figure 6-2). You can run lokkit by entering the command lokkit at a command line or in a terminal window. See s 7 and 40 for detailed information on setting up a firewall.
Figure 6-2: lokkit Tip You can also run gnome-lokkit, which will prompt you for different settings using Gnome dialog boxes. An advanced option lets you select different services to be allowed such as mail, the secure shell, FTP, the Web server, and the FTP server (see Figure 6-3). For any service that is not listed, you can enter its name and the protocol it uses manually, such as imap:tcp for the IMAP mail service using the TCP protocol.
Figure 6-3: lokkit advanced options lokkit uses the older IP Chains firewalling rules and places them in the /etc/sysconfig/ipchains file. Should you want to remove your firewall, you can use lokkit and select the No Firewall option. lokkit is also used by the installation program to set up your firewall, enabling ipchains. Note lokkit only supports the older IP Chains, not the newer IP Tables. If you want to use IP Tables, you first have to remove the /etc/sysconfig/ipchains file and then use the Service Configuration tool, chkconfig, or setup to remove ipchains as a startup service. You can then set up iptables as a startup service and create an /etc/sysconfig/iptables file for its rules (see 40). If you need more refined firewall protection than lokkit can provide, you can use the packetfiltering program iptables in which you can manually list your firewall rules. With the iptables command, you can enter rules with which you can control access to your system. iptables has been developed by the Netfilter Project at netfilter.samba.org. The iptables program is the successor to ipchains, used on older versions of Linux. See 40 for a detailed description of iptables.
Proxies (Squid)
Squid is a proxy-caching server for Web clients, designed to speed Internet access. It implements a proxy-caching service for Web clients that caches Web pages as users make requests and provides security controls for Web site access. Squid is supported and distributed under a GNU Public License by the National Laboratory for Applied Network Research (NLANR) at the University of California, San Diego. The work is based on the Harvest Project. You can obtain current source code versions and online documentation from the Squid home page at http://squid.nlanr.net and the Squid FTP site at ftp.nlanr.net. Tip You can also configure Squid using Linuxconf or Webmin. In Webmin, select the Squid Proxy Server from the Servers page. To configure Squid to provide security to your Web server, you first define access control lists (ACL) using the acl command, in which you create a label for the systems on which you are setting controls. You then use commands such as http_access to define these controls. You can define a system, or a group of systems, according to several acl options, such as the
source IP address, the domain name, or even the time and date. For example, the src option is used to define a system or group of systems with a certain source address. To define a mylan acl entry for systems in a local network with the addresses 192.168.1.0 through 192.168.1.255, use the following ACL definition:
acl mylan src 192.168.1.0/255.255.255.0
Once these are defined, you can use an ACL definition in a Squid option to specify a control you want to place on those systems. For example, to allow access by the mylan group of local systems to the Web through the proxy, use an http_access option with the allow action specifying mylan as the acl definition to use, as shown here:
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