Handle older UFW version from Jessie

auto_install/install.sh

@@ -971,8 +971,21 @@ confNetwork() {
             $SUDO sed "/delete these required/i *nat\n:POSTROUTING ACCEPT [0:0]\n-I POSTROUTING -s 10.8.0.0/24 -o $IPv4dev -j MASQUERADE\nCOMMIT\n" -i /etc/ufw/before.rules
             # Insert rules at the beginning of the chain (in case there are other rules that may drop the traffic)
             $SUDO ufw insert 1 allow "$PORT"/"$PROTO" >/dev/null
-            # Don't forward everything, just the traffic originated from the VPN subnet
+
-            $SUDO ufw route insert 1 allow in on tun0 from 10.8.0.0/24 out on "$IPv4dev" to any >/dev/null
+            # https://askubuntu.com/a/712202
+            INSTALLED_UFW=$(dpkg-query --showformat='${Version}' --show ufw)
+            MINIMUM_UFW=0.34
+
+            if $SUDO dpkg --compare-versions "$INSTALLED_UFW" ge "$MINIMUM_UFW"; then
+                # Don't forward everything, just the traffic originated from the VPN subnet
+                $SUDO ufw route insert 1 allow in on tun0 from 10.8.0.0/24 out on "$IPv4dev" to any >/dev/null
+                echo 0 > /tmp/OLD_UFW
+            else
+                # This ufw version does not support route command, fallback to policy change
+                $SUDO sed -i "s/\(DEFAULT_FORWARD_POLICY=\).*/\1\"ACCEPT\"/" /etc/default/ufw
+                echo 1 > /tmp/OLD_UFW
+            fi
+
             $SUDO ufw reload >/dev/null
             echo "::: UFW configuration completed."
         fi
@@ -1035,6 +1048,7 @@ confNetwork() {
     echo "$FORWARD_CHAIN_EDITED" > /tmp/FORWARD_CHAIN_EDITED
 
     $SUDO cp /tmp/noUFW /etc/pivpn/NO_UFW
+    $SUDO cp /tmp/OLD_UFW /etc/pivpn/OLD_UFW
     $SUDO cp /tmp/INPUT_CHAIN_EDITED /etc/pivpn/INPUT_CHAIN_EDITED
     $SUDO cp /tmp/FORWARD_CHAIN_EDITED /etc/pivpn/FORWARD_CHAIN_EDITED
 }

scripts/pivpnDebug.sh

@@ -5,6 +5,10 @@ PORT=$(cat /etc/pivpn/INSTALL_PORT)
 PROTO=$(cat /etc/pivpn/INSTALL_PROTO)
 IPv4dev="$(cat /etc/pivpn/pivpnINTERFACE)"
 REMOTE="$(grep 'remote ' /etc/openvpn/easy-rsa/pki/Default.txt | awk '{print $2}')"
+NO_UFW=$(cat /etc/pivpn/NO_UFW)
+OLD_UFW=$(cat /etc/pivpn/NO_UFW)
+INPUT_CHAIN_EDITED="$(cat /etc/pivpn/INPUT_CHAIN_EDITED)"
+FORWARD_CHAIN_EDITED="$(cat /etc/pivpn/FORWARD_CHAIN_EDITED)"
 ERR=0
 
 echo -e "::::\t\t\e[4mPiVPN debug\e[0m\t\t ::::"
@@ -46,7 +50,7 @@ else
     fi
 fi
 
-if [ "$(cat /etc/pivpn/NO_UFW)" -eq 1 ]; then
+if [ "$NO_UFW" -eq 1 ]; then
 
     if iptables -t nat -C POSTROUTING -s 10.8.0.0/24 -o "${IPv4dev}" -j MASQUERADE &> /dev/null; then
         echo ":: [OK] Iptables MASQUERADE rule set"
@@ -61,7 +65,7 @@ if [ "$(cat /etc/pivpn/NO_UFW)" -eq 1 ]; then
         fi
     fi
 
-    if [ "$(cat /etc/pivpn/INPUT_CHAIN_EDITED)" -eq 1 ]; then
+    if [ "$INPUT_CHAIN_EDITED" -eq 1 ]; then
         if iptables -C INPUT -i "$IPv4dev" -p "$PROTO" --dport "$PORT" -j ACCEPT &> /dev/null; then
             echo ":: [OK] Iptables INPUT rule set"
         else
@@ -75,7 +79,7 @@ if [ "$(cat /etc/pivpn/NO_UFW)" -eq 1 ]; then
         fi
     fi
 
-    if [ "$(cat /etc/pivpn/FORWARD_CHAIN_EDITED)" -eq 1 ]; then
+    if [ "$FORWARD_CHAIN_EDITED" -eq 1 ]; then
         if iptables -C FORWARD -s 10.8.0.0/24 -i tun0 -o "$IPv4dev" -j ACCEPT &> /dev/null; then
             echo ":: [OK] Iptables FORWARD rule set"
         else
@@ -126,15 +130,30 @@ else
         fi
     fi
 
-    if iptables -C ufw-user-forward -i tun0 -o "${IPv4dev}" -s 10.8.0.0/24 -j ACCEPT &> /dev/null; then
+    if [ "$OLD_UFW" -eq 1 ]; then
-        echo ":: [OK] Ufw forwarding rule set"
+        FORWARD_POLICY="$(iptables -S FORWARD | grep '^-P' | awk '{print $3}')"
+        if [ "$FORWARD_POLICY" = "ACCEPT" ]; then
+            echo ":: [OK] Ufw forwarding policy is accept"
+        else
+            ERR=1
+            read -r -p ":: [ERR] Ufw forwarding policy is not 'ACCEPT', attempt fix now? [Y/n] " REPLY
+            if [[ ${REPLY} =~ ^[Yy]$ ]]; then
+                sed -i "s/\(DEFAULT_FORWARD_POLICY=\).*/\1\"ACCEPT\"/" /etc/default/ufw
+                ufw reload > /dev/null
+                echo "Done"
+            fi
+        fi
     else
-        ERR=1
+        if iptables -C ufw-user-forward -i tun0 -o "${IPv4dev}" -s 10.8.0.0/24 -j ACCEPT &> /dev/null; then
-        read -r -p ":: [ERR] Ufw forwarding rule is not set, attempt fix now? [Y/n] " REPLY
+            echo ":: [OK] Ufw forwarding rule set"
-        if [[ ${REPLY} =~ ^[Yy]$ ]]; then
+        else
-            ufw route insert 1 allow in on tun0 from 10.8.0.0/24 out on "$IPv4dev" to any
+            ERR=1
-            ufw reload
+            read -r -p ":: [ERR] Ufw forwarding rule is not set, attempt fix now? [Y/n] " REPLY
-            echo "Done"
+            if [[ ${REPLY} =~ ^[Yy]$ ]]; then
+                ufw route insert 1 allow in on tun0 from 10.8.0.0/24 out on "$IPv4dev" to any
+                ufw reload
+                echo "Done"
+            fi
         fi
     fi
 

scripts/uninstall.sh

@@ -4,6 +4,7 @@
 INSTALL_USER=$(cat /etc/pivpn/INSTALL_USER)
 PLAT=$(cat /etc/pivpn/DET_PLATFORM)
 NO_UFW=$(cat /etc/pivpn/NO_UFW)
+OLD_UFW=$(cat /etc/pivpn/NO_UFW)
 PORT=$(cat /etc/pivpn/INSTALL_PORT)
 PROTO=$(cat /etc/pivpn/INSTALL_PROTO)
 IPv4dev="$(cat /etc/pivpn/pivpnINTERFACE)"
@@ -97,7 +98,11 @@ echo ":::"
     if [[ $NO_UFW -eq 0 ]]; then
         sed -z "s/*nat\n:POSTROUTING ACCEPT \[0:0\]\n-I POSTROUTING -s 10.8.0.0\/24 -o $IPv4dev -j MASQUERADE\nCOMMIT\n\n//" -i /etc/ufw/before.rules
         ufw delete allow "$PORT"/"$PROTO" >/dev/null
-        ufw route delete allow in on tun0 from 10.8.0.0/24 out on "$IPv4dev" to any >/dev/null
+        if [ "$OLD_UFW" -eq 1 ]; then
+            sed -i "s/\(DEFAULT_FORWARD_POLICY=\).*/\1\"DROP\"/" /etc/default/ufw
+        else
+            ufw route delete allow in on tun0 from 10.8.0.0/24 out on "$IPv4dev" to any >/dev/null
+        fi
         ufw reload >/dev/null
     else
         iptables -t nat -D POSTROUTING -s 10.8.0.0/24 -o "${IPv4dev}" -j MASQUERADE