diff --git a/.installer/packages b/.installer/packages
index 41c8962..6fd3725 100644
--- a/.installer/packages
+++ b/.installer/packages
@@ -1,5 +1,5 @@
 pacman-any:feh,i3exit,i3status,network-manager-applet,pasystray,xautolock,inotify-tools,xss-lock,noto-fonts-emoji
 pacman-any:gst-libav,phonon-qt5-gstreamer,gst-plugins-good,qt5-quickcontrols,qt5-graphicaleffects,qt5-multimedia
-pacman-any:code,vim
+pacman-any:code,vim,ufw
 pacman-laptop:brightnessctl
 aur-any:picom-git,flashfocus-git,sddm-theme-aerial-git
diff --git a/setup_system.sh b/setup_system.sh
index 7089d2a..149a891 100755
--- a/setup_system.sh
+++ b/setup_system.sh
@@ -58,31 +58,6 @@ function get_packages() {
     done
 }
 
-function configure_sddm() {
-    local sddm_config_dir="/etc/sddm.conf.d"
-    local theme_dir="/usr/share/sddm/themes/aerial"
-
-    echo "Setting up '$sddm_config_dir'."
-
-    if ! [ -d "$sddm_config_dir" ]; then
-        sudo mkdir "$sddm_config_dir"
-        sudo chown root:root -R "$sddm_config_dir"
-    fi
-
-    {
-        echo "[Theme]"
-        echo "Current=aerial"
-    } | sudo tee "$sddm_config_dir/theme" >/dev/null
-
-    {
-        echo "[X11]"
-        echo "DisplayCommand=/usr/share/sddm/scripts/Xsetup"
-    } | sudo tee "$sddm_config_dir/xsetup" >/dev/null
-
-    echo "Setting up '$theme_dir'."
-    sudo mv "$theme_dir/theme.conf.user" "$theme_dir/theme.conf.user.disabled"
-}
-
 function prepare_arch() {
     which pamac >/dev/null && return 0
     sudo pacman -S pamac --noconfirm || return 1
@@ -117,11 +92,47 @@ function setup_arch_with_yay() {
     done
 }
 
+function configure_sddm() {
+    local sddm_config_dir="/etc/sddm.conf.d"
+    local theme_dir="/usr/share/sddm/themes/aerial"
+    local theme_user_config="$theme_dir/theme.conf.user"
+
+    echo "Setting up '$sddm_config_dir'."
+
+    if ! [ -d "$sddm_config_dir" ]; then
+        sudo mkdir "$sddm_config_dir"
+        sudo chown root:root -R "$sddm_config_dir"
+    fi
+
+    {
+        echo "[Theme]"
+        echo "Current=aerial"
+    } | sudo tee "$sddm_config_dir/theme" >/dev/null
+
+    {
+        echo "[X11]"
+        echo "DisplayCommand=/usr/share/sddm/scripts/Xsetup"
+    } | sudo tee "$sddm_config_dir/xsetup" >/dev/null
+
+    echo "Setting up '$theme_dir'."
+    [ -f "$theme_user_config" ] && sudo mv "$theme_user_config" "$theme_user_config.disabled"
+}
+
+function configure_ufw() {
+    echo "Setting up UFW."
+
+    sudo systemctl enable ufw.service || return 1
+    sudo systemctl start ufw.service || return 2
+    sudo ufw enable || return 3
+    sudo ufw allow ssh || return 4
+}
+
 function setup_arch() {
     prepare_arch || return 1
     setup_arch_with_pamac || return 2
     setup_arch_with_yay || return 3
     configure_sddm || return 4
+    configure_ufw || return 5
 }
 
 ID_LIKE="$(grep ID_LIKE= </etc/os-release | cut -d= -f2)"