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Update a Hetzner Firewall rule with your IP address
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#!/bin/bash | |
# Script to update a firewall rule in a Hetzner Firewall with your current IP address. | |
# Good if you would like to restrict SSH access only for your current IP address (secure). | |
################# | |
# WARNING: This script will overwrite all rules in the firewall rules, so make sure you | |
# added all the required rules. | |
# I use a separate firewall rule just for SSH access. | |
################# | |
# Prerequisites: | |
# 1. Download: hcloud cli (https://github.com/hetznercloud/cli) | |
# 2. Authenticate: hcloud context create | |
# 3. Need to make the firewall rule in advance, add resources to it. | |
# Get the name with 'hcloud firewall list' | |
FIREWALL_NAME="<your-firewall-name>" | |
MY_IP_ADDRESS=$(curl -4s https://icanhazip.com) | |
if [ $? -ne 0 ]; then | |
echo "Failed to get my IP address" | |
exit 1 | |
fi | |
# Add your own rules here if necessary. | |
RULES=$(cat <<EOF | |
[ | |
{ | |
"description": "SSH for me", | |
"direction": "in", | |
"port": "22", | |
"protocol": "tcp", | |
"source_ips": ["$MY_IP_ADDRESS/32"] | |
} | |
] | |
EOF | |
) | |
CURRENT_RULES=$(hcloud firewall describe $FIREWALL_NAME --output json | jq -r '.rules[] | select(.description == "SSH for me") | .source_ips[0]' | cut -d'/' -f1) | |
if [ $? -ne 0 ]; then | |
echo "Failed to get current firewall rules with name $FIREWALL_NAME" | |
exit 1 | |
fi | |
echo "My IP: $MY_IP_ADDRESS" | |
echo "IP in firewall: $CURRENT_RULES" | |
if [ "$MY_IP_ADDRESS" != "$CURRENT_RULES" ]; then | |
echo "IP changed, updating firewall" | |
hcloud firewall replace-rules $FIREWALL_NAME --rules-file - <<<"$RULES" | |
else | |
echo "IP is the same, skipping" | |
fi |
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