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This chapter gives an introduction to the Gaia command line interface (CLI).

The default shell of the CLI is called clish.

To use the CLI:

1. Connect to the platform using a command-line connection (SSH or a console) over a TCP/IP network.
2. Log on using a user name and password.

   Immediately after installation, the default user name and password are admin and admin.

Saving Configuration Changes

Configuration changes you enter using the CLI are applied immediately to the running system. To ensure that these changes remain after you reboot, that is, to save your changes permanently, run save config at the CLI prompt.

Commands and Features

Gaia commands are organized into features. A feature is a group of related commands.

Commands have the syntax

The most common operations are show, add, set, delete

At the --More-- prompt:

Command Completion

You can automatically complete a command. This saves time, and can also help if you are not sure what to type next.

Command History

You can recall commands you have used before, even in previous sessions.

Command Reuse

You can combine word designators with history commands to refer to specific words used in previous commands. Words are numbered from the beginning of the line with the first word being denoted by 0. Use a colon to separate a history command from a word designator. For example, you could enter !!:1 to refer to the first argument in the previous command. In the command show interfaces, interfaces is word 1.

Immediately after word designators, you can add a sequence of one or more of the following modifiers, each preceded by a colon:

Command Line Movement and Editing

You can back up in a command you are typing to correct a mistake. To edit a command, use the left and right arrow keys to move around and the Backspace key to delete characters. You can enter commands that span more than one line.

These are the keystroke combinations you can use:

Obtaining a Configuration Lock

Only one user can have Read/Write access to Gaia configuration settings at a time. All other users can log in with Read-Only access to see configuration settings, as specified by their assigned roles.

When you log in and no other user has Read/Write access, you get an exclusive configuration lock with Read/Write access. If a different user already has the configuration lock, you have the option to override their lock. If you:

• Override the lock, the other user stays logged in with Read-Only access.
• Do not override the lock, you cannot modify the settings.

Use the database feature to obtain the configuration lock. The database feature has two commands:

• lock database [override].
• unlock database

The commands do the same thing: obtain the configuration lock from another administrator.

Configuring Configuration Lock Behavior

The behavior of the configuration lock command is configured using: config-lock.

32 and 64-bit Gaia Editions

64-bit support for a Gaia device depends on the appliance type (for a Check Point appliance) and hardware capabilities (for open servers).

For more on supported platforms and kernels, see the R76 Release notes.

Open servers always install a 32-bit kernel, but you can switch to the 64-bit kernel using the Edition feature.

To see which edition is running:

• Go to the WebUI System Overview pane. The edition shows in the System Overview widget.

  or

• On the command line, run: show version os edition

Environment Commands

Client Environment Output Format

Expert Mode

The default shell of the CLI is called clish. Clish is a restrictive shell (role-based administration controls the number of commands available in the shell). While use of clish is encouraged for security reasons, clish does not give access to low level system functions. For low level configuration, use the more permissive expert shell.

• To use the expert shell, run: expert
• To exit the expert shell and return to clish, run: exit

Expert- Password

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A password protects that expert shell against authorized access. The expert password can be changed using the expert-password feature.

User Defined (Extended) Commands

OS X v10.5.1 and later include an application firewall you can use to control connections on a per-application basis (rather than a per-port basis). This makes it easier to gain the benefits of firewall protection, and helps prevent undesirable apps from taking control of network ports open for legitimate apps.

Configuring the application firewall in OS X v10.6 and later

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Use these steps to enable the application firewall:

1. Choose System Preferences from the Apple menu.
2. Click Security or Security & Privacy.
3. Click the Firewall tab.
4. Unlock the pane by clicking the lock in the lower-left corner and enter the administrator username and password.
5. Click 'Turn On Firewall' or 'Start' to enable the firewall.
6. Click Advanced to customize the firewall configuration.

Configuring the Application Firewall in Mac OS X v10.5

Make sure you have updated to Mac OS X v10.5.1 or later. Then, use these steps to enable the application firewall:

1. Choose System Preferences from the Apple menu.
2. Click Security.
3. Click the Firewall tab.
4. Choose what mode you would like the firewall to use.

Advanced settings

Block all incoming connections

Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections. The system services that are still allowed to receive incoming connections are:

• configd, which implements DHCP and other network configuration services
• mDNSResponder, which implements Bonjour
• racoon, which implements IPSec

To use sharing services, make sure 'Block all incoming connections' is deselected.

Allowing specific applications

To allow a specific app to receive incoming connections, add it using Firewall Options:

1. Open System Preferences.
2. Click the Security or Security & Privacy icon.
3. Select the Firewall tab.
4. Click the lock icon in the preference pane, then enter an administrator name and password.
5. Click the Firewall Options button
6. Click the Add Application (+) button.
7. Select the app you want to allow incoming connection privileges for.
8. Click Add.
9. Click OK.

You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.

Automatically allow signed software to receive incoming connections

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Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.

If you run an unsigned app that is not listed in the firewall list, a dialog appears with options to Allow or Deny connections for the app. If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you choose Deny, OS X adds it to the list but denies incoming connections intended for this app.

If you want to deny a digitally signed application, you should first add it to the list and then explicitly deny it.

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Some apps check their own integrity when they are opened without using code signing. If the firewall recognizes such an app it doesn't sign it. Instead, it the 'Allow or Deny' dialog appears every time the app is opened. This can be avoided by upgrading to a version of the app that is signed by its developer.

Enable stealth mode

Enabling stealth mode prevents the computer from responding to probing requests. The computer still answers incoming requests for authorized apps. Unexpected requests, such as ICMP (ping) are ignored.

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Firewall limitations

The application firewall is designed to work with Internet protocols most commonly used by applications – TCP and UDP. Firewall settings do not affect AppleTalk connections. The firewall may be set to block incoming ICMP 'pings' by enabling Stealth Mode in Advanced Settings. Earlier ipfw technology is still accessible from the command line (in Terminal) and the application firewall does not overrule any rules set using ipfw. If ipfw blocks an incoming packet, the application firewall does not process it.