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README.md

@@ -125,5 +125,8 @@ According to the libcloud's documentation "unlimited" attributes like for exampl
 * Don't blindly trust the scraped prices of the program output as they are not scraped by me but libcloud's library
 
 # License 📜
-
+<p align="left">
-[GPLv3](https://www.gnu.org/licenses/gpl-3.0.html)
+  <a href="https://www.gnu.org/licenses/gpl-3.0.html">
+    <img src="assets/images/gplv3.png?raw=true" width="250"/>
+  </a>
+</p>

harden

@@ -151,11 +151,111 @@ function hardenSSH {
 	fi
 }
 
+function getCorrectFirewall {
+	local distro                    # Declare distro as a local variable
+	distro="$(get_distro)"          # Get the distribution name
+	case "$distro" in               # Use case to check for the distribution name
+		"Ubuntu" | "Debian GNU/Linux") # If the distribution is Ubuntu or Debian
+			apt install ufw -y # Install ufw
+            printf "%s" "ufw" # Output ufw
+			;;
+		"CentOS Linux" | "Fedora" | "Red Hat Enterprise Linux Server") # If the distribution is CentOS, Fedora or RHEL
+			dnf install firewalld -y # Install firewalld
+            printf "%s" "firewalld" # Output firewalld
+			;;
+
+		"openSUSE Leap")      # If the distribution is OpenSUSE
+			zypper install firewalld -y # Install firewalld
+            printf "%s" "firewalld" # Output firewalld
+			;;
+		*)
+			# If the distribution is none of the above, output unsupported distribution
+			# and exit with error code 1
+			printf "%s" "Unsupported distribution"
+			exit 1 # Exit with error code 1
+			;;
+	esac
+
+}
+
+function getCorrectKernelSecurityModule {
+	local distro                    # Declare distro as a local variable
+	distro="$(get_distro)"          # Get the distribution name
+	case "$distro" in               # Use case to check for the distribution name
+		"Ubuntu") # If the distribution is Debian
+			apt install apparmor-profiles -y # Install apparmor
+            printf "%s" "apparmor" # Output apparmor
+			;;
+        "Debian GNU/Linux") # If the distribution is Debian
+            apt install apparmor apparmor-utils auditd
+            printf "%s" "apparmor" # Output apparmor
+            ;;
+		"CentOS Linux" | "Fedora" | "Red Hat Enterprise Linux Server") # If the distribution is CentOS, Fedora or RHEL
+			dnf install selinux -y # Install selinux
+            printf "%s" "selinux" # Output selinux
+			;;
+
+		"openSUSE Leap")      # If the distribution is OpenSUSE
+			zypper install libapparmor apparmor-profiles apparmor-utils apparmor-parser yast2-apparmor apparmor-docs -y # Install apparmor
+            printf "%s" "apparmor" # Output apparmor
+			;;
+		*)
+			# If the distribution is none of the above, output unsupported distribution
+			# and exit with error code 1
+			printf "%s" "Unsupported distribution"
+			exit 1 # Exit with error code 1
+			;;
+    esac
+}
+
+function firewallInit {
+    local firewall
+    firewall="$(getCorrectFirewall)" # Get the correct firewall
+    case "$firewall" in
+        ufw)
+            sudo ufw default allow outgoing # Allow outgoing connections
+            sudo ufw default deny incoming  # Deny incoming connections
+            sudo ufw allow 22100/tcp        # Allow ssh connections on port 22100
+            sudo ufw enable                 # Enable the firewall
+            sudo systemctl enable ufw       # Enable the firewall on boot
+            sudo systemctl start ufw        # Start the firewall
+        ;;
+        firewalld)
+            sudo systemctl enable --now firewalld # Enable the firewall on boot and start it
+            sudo firewall-cmd --permanent --add-port=22100/tcp # Allow ssh connections on port 22100
+            sudo firewall-cmd --reload # Reload the firewall
+        ;;
+        *)
+            printf "%s" "Unsupported firewall"
+            exit 1
+        ;;
+    esac
+}
+
+function kernelSecurityModuleInit {
+    local kernelSecurityModule
+    kernelSecurityModule="$(getCorrectKernelSecurityModule)" # Get the correct kernel security module
+    case "$kernelSecurityModule" in
+        apparmor)
+            sudo systemctl enable --now apparmor # Enable the kernel security module on boot and start it
+        ;;
+        selinux)
+            sudo systemctl enable --now selinux # Enable the kernel security module on boot and start it
+        ;;
+        *)
+            printf "%s" "Unsupported kernel security module"
+            exit 1
+        ;;
+    esac
+}
+
 # The main function will call the check_dependencies function and exit if it fails.
 # It will also output a message to the user to let them know that the script has finished.
 function main {
 	check_dependencies || exit 1  # Check dependencies and exit if it fails
     harden_ssh || exit 1          # Harden ssh and exit if it fails
+    firewallInit || exit 1        # Initialize the firewall and exit if it fails
+    kernelSecurityModuleInit || exit 1 # Initialize the kernel security module and exit if it fails
 	printf "%s" "Script finished" # Output message to the user
 }