Cleaned up and merge other Linux snippit repo

Meged https://git.bprieshof.nl/brammp/linux into ./Linux

Linux/Scripts/Ufw-AddCustomRule-SSH_4242.sh

@@ -0,0 +1,39 @@
+###############################################################
+# @description:                                               #
+#   Add Custom rule to UFW for limiting ssh(4242/tcp)         #
+#                                                             #
+# @author: Bram Prieshof                                      #
+###############################################################
+
+#Sed in a function to detect line from $FindLine and insert the content of $AddLine on a new line above the match
+UpdateFile () {
+    file="$1"
+    sed -i 's/'"$FindLine"'/'"$AddLine"'\n&/g' $file
+    unset FindLine AddLine
+}
+
+#Delete Existng SSH(4242/tcp) rule(s)
+ufw delete limit 4242/tcp
+
+#Add needed filters (IPv4)
+FindLine="# End required lines"
+AddLine=":ufw-user-limit - [0:0]\n:ufw-user-limit-accept - [0:0]"
+UpdateFile /etc/ufw/after.rules
+
+#Add needed filters (IPv6)
+FindLine="# End required lines"
+AddLine=":ufw6-user-limit - [0:0]\n:ufw6-user-limit-accept - [0:0]"
+UpdateFile /etc/ufw/after6.rules
+
+#Add custom SSH(4242/tcp) limit rule (IPv4)
+FindLine="# don't delete the 'COMMIT' line or these rules won't be processed"
+AddLine="### SSH limit tcp\n-A ufw-after-input -p tcp --dport 4242 -m conntrack --ctstate NEW -m recent --set\n-A ufw-after-input -p tcp --dport 4242 -m conntrack --ctstate NEW -m recent --update --seconds 30 --hitcount 15 -j ufw-user-limit\n-A ufw-after-input -p tcp --dport 4242 -j ufw-user-limit-accept\n"
+UpdateFile /etc/ufw/after.rules
+
+#Add custom SSH(4242/tcp) limit rule (IPv6)
+FindLine="# don't delete the 'COMMIT' line or these rules won't be processed"
+AddLine="### SSH limit tcp\n-A ufw6-after-input -p tcp --dport 4242 -m conntrack --ctstate NEW -m recent --set\n-A ufw6-after-input -p tcp --dport 4242 -m conntrack --ctstate NEW -m recent --update --seconds 30 --hitcount 15 -j ufw6-user-limit\n-A ufw6-after-input -p tcp --dport 4242 -j ufw6-user-limit-accept\n"
+UpdateFile /etc/ufw/after6.rules
+
+#Reload ufw rules
+ufw reload