Software To Block Internet Access Mac

  

You can use the Lulu open-source macOS firewall that aims to block unknown outgoing connections, unless explicitly approved by the user. Whilst it has a GUI, the set of blocked applications can be controlled via the command line by modifying the config file /Library/Objective-See/LuLu/rules.plist as explained in the Lulu webpage (near the bottom). MyWIFIzone is an Internet Access Blocker that stops freeloaders from surfing the web from your WIFI network. Features include real-time intruder alerts and event logging. Supports non-monitor mode. Freedom to be incredibly productive Freedom is the app and website blocker for Mac, Windows, Android, iOS, and Chrome, used by over 1,000,000 people to reclaim focus and produc­tivity. Experience the freedom to do what matters most. Password must contain at least six characters. Apr 18, 2020  OS X includes an application firewall you can use to control connections made to your computer from other computers on your network. 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).

Although the default setting for your Mac’s firewall should be adequate for most people, you may want to configure your firewall to block additional Internet features for added security. For example, most people will likely need to access e-mail and web pages, but if you never transfer files by using FTP (short for File Transfer Protocol), you can safely block this service.

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Don’t configure your firewall unless you’re sure that you know what you’re doing. Otherwise, you may weaken the firewall or lock programs from accessing the Internet and not know how to repair those problems.

To configure your Mac’s firewall, follow these steps:

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  1. Choose Command→System Preferences and then click the Security & Privacy icon.

    If the lock icon in the lower-left corner of the preferences window is locked, you must unlock it to make changes to your Mac’s user account details. Click the lock icon, type your password in the dialog that appears, and then press Return to unlock your Mac’s user account details.

  2. Click the Firewall tab.

    The Firewall preferences pane appears.

  3. Click the Turn On Firewall button to turn on your Mac’s firewall (if it isn’t already turned on).

  4. Click the Firewall Options button to display the firewall’s custom settings, as shown in this figure.

    The dialog that appears offers three check boxes.

    In the center list box, you may see one or more sharing services you turned on by using the Sharing preferences pane Command→System Preferences→Sharing).

  5. Select (or deselect) the following check boxes:

    • Block All Incoming Connections: Allows only essential communications for basic Internet and Mail access; also blocks sharing services, such as iTunes music sharing or Messages screen sharing. When you select this option, any services or applications listed in the pane disappear, replaced with a static warning that indicates all sharing services are being blocked.

    • Automatically Allow Signed Software to Receive Incoming Connections: Allows typical commercial applications such as Microsoft Word to check for software updates and Safari to access the web.

    • Enable Stealth Mode: Makes the firewall refuse to respond to any outside attempts to contact it and gather information based on its responses.

  6. Continue to Step 8 if you want to make additional adjustments to your Mac’s firewall feature; otherwise, skip to Step 13.

  7. (Optional) Click the Add (+) button to add applications that you want to allow or block from communicating over the Internet.

    A dialog appears, listing the contents of the Applications folder.

  8. Click a program that you want to allow to access the Internet, such as Dropbox or Skype.

  9. Click Add.

    Your chosen program appears under the Applications category.

  10. (Optional) Click the pop-up button to the right of an application in the applications list and choose Allow Incoming Communications or Block Incoming Communications.

  11. (Optional) To remove a program from the applications list, click the program name to select it and click the Delete (–) button below the program list.

  12. Click OK.

Beginning with Mac OS X 10.7 Lion, your Mac’s security was enhanced with two features:

  • Advanced Space Layout Randomization (ASLR): Makes your applications more resistant to malicious attacks

  • Sandboxing: Limits the types of operations an application can do, thereby making it difficult for a threat to take advantage of an application and, consequently, affect the whole operating system. Think of it as strengthening a potential weak link.

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

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 bottom-left corner and enter the administrator username and password.
  5. Click 'Turn On Firewall' or 'Start' to enable the firewall.
  6. Click Advanced to customise the firewall configuration.

Configuring the Application Firewall in Mac OS X v10.5

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

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  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 that '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

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

Some apps check their own integrity when they are opened without using code signing. If the firewall recognises such an app, it doesn't sign it. Instead, the 'Allow or Deny' dialogue 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

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

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Firewall limitations

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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.