It is important to note that this tab directly effects the script generated for the firewall being configured and not the machine that Firewall Builder is running on. Make sure that the commands entered can be run as a bash shell script without any errors.įinally, the Script Tab offers a number of setting options, of which there are four settings to pay close attention to. Prolog scripts can be added in three different locations, whereas Epilog scripts can only be added to the end. The commands would need to be added to the epilog (end) of the firewall as shown in Figure 3. For example, the amount of traffic being served up by an HTTP server can be controlled by using the Traffic Control command ( tc). This tab allows for the addition of script commands in bash format to be added either to the beginning or to the end of a firewall script. The next tab that should be of use is the Prolog/Epilog. Should that be the case, simply add something like -p 2222 to instruct ssh to use non-standard port 2222 (instead of standard port 22). This is an incredibly helpful should ssh and/or scp use alternative ports. So in this section, enter a username that does have admin rights and can actually install firewall rules (if the user can use the iptables command, that user most likely has rights enough.) If the username setting is left blank the user will be prompted to enter the username when they run the install wizard.įinally, in the installation tab, there is the additional command line parameters for both ssh and scp options. If the username configured in the installer tab does not have administrative rights, the installation will fail. This is the username that will be used when Firewall Builder connects to the firewall to install the generated firewall script. The second setting to pay attention to is the username. Typically for iptables firewalls the directory is either /etc/ or /etc/fw (if this directory has been created on the firewall). This should match a directory that exists on the firewall where the firewall script should be run. The first is the option “Directory on the firewall where script should be installed”. The Installer Tab has three settings that you should pay close attention to. When the firewall is compiled, Firewall Builder will automatically add a rule permitting SSH access to the firewall from this IP address or network at the top of the generated rules. If this option is enabled, enter either a single IP address or a network using CIDR notation (e.g. This helps prevent situations where a user cuts off their access to the firewall because there isn’t a rule allowing SSH access to the firewall itself. The configuration options here will be automatically compiled into the firewall in question.Īnother important option is ‘Always permit ssh access from the management workstation with this address’. In iptables this will result in a rule being added to either the OUTPUT or INPUT rule chain. If this option is checked, rules that are configured with “Any” in the Source or Destination fields will also generate rules for traffic destined to or from the firewall. The first option is ‘Assume firewall is part of “any”‘. There are a few options, in particular, that I want to point out. The compiler tab (see Figure 2), as the name implies, deals with the compiling settings for the firewall. Click that button to get to the settings in question. The Firewall Settings button is located near the center of the window. When the Firewall Settings button is clicked, it will open the settings window only for the currently open firewall. Once the firewall is open (double click on the firewall to edit it), look for the Firewall Settings Button (see Figure 1). So, in order to reach the settings window, a firewall must be open within Firewall Builder. The settings I am referring to actually apply to individual firewalls. What I’m talking about is not the Firewall Builder Preferences. We’ve covered quite a bit already about Firewall Builder This week, I want to open up the Firewall Settings window to illustrate how much further a Firewall can be flexed, stretched, and configured - all from a single, user-friendly window.Īs should be expected, getting to the settings window is simple - so long as it’s not overlooked. In the last installment of our series on Firewall Builder, I’ll take a look at managing firewall settings with the Firewall Builder. Last week we looked at managing rules in Firewall Builder.
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