Merge pull request #56 from shichao-an/master

Added Application Firewall socketfilterfw

README.md

@@ -55,6 +55,7 @@ If you want to contribute, you are highly encouraged to do so. Please read the [
 - [Package Managers](#package-managers)
 - [Printing](#printing)
 - [Security](#security)
+    - [Application Firewall](#application-firewall)
     - [Gatekeeper](#gatekeeper)
     - [Passwords](#passwords)
     - [Physical Access](#physical-access)
@@ -809,6 +810,28 @@ defaults write com.apple.print.PrintingPrefs "Quit When Finished" -bool true
 
 ## Security
 
+### Application Firewall
+
+#### Show Firewall Status
+```bash
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate
+```
+
+#### Turn on Firewall
+```bash
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setglobalstate on
+```
+
+#### Turn off Firewall
+```bash
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setglobalstate off
+```
+
+#### Add Application to Firewall
+```bash
+sudo /usr/libexec/ApplicationFirewall/socketfilterfw --add /path/to/file
+```
+
 ### Gatekeeper
 
 #### Add Gatekeeper Exception