Create self-signed certificates for Eclipse Mosquitto MQTT broker

make-keys.sh

#!/bin/bash

IP="192.168.1.22"
SUBJECT_CA="/C=SE/ST=Stockholm/L=Stockholm/O=himinds/OU=CA/CN=$IP"
SUBJECT_SERVER="/C=SE/ST=Stockholm/L=Stockholm/O=himinds/OU=Server/CN=$IP"
SUBJECT_CLIENT="/C=SE/ST=Stockholm/L=Stockholm/O=himinds/OU=Client/CN=$IP"

function generate_CA () {
   echo "$SUBJECT_CA"
   openssl req -x509 -nodes -sha256 -newkey rsa:2048 -subj "$SUBJECT_CA"  -days 365 -keyout ca.key -out ca.crt
}

function generate_server () {
   echo "$SUBJECT_SERVER"
   openssl req -nodes -sha256 -new -subj "$SUBJECT_SERVER" -keyout server.key -out server.csr
   openssl x509 -req -sha256 -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt -days 365
}

function generate_client () {
   echo "$SUBJECT_CLIENT"
   openssl req -new -nodes -sha256 -subj "$SUBJECT_CLIENT" -out client.csr -keyout client.key 
   openssl x509 -req -sha256 -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -days 365
}

function copy_keys_to_broker () {
   sudo cp ca.crt /etc/mosquitto/certs/
   sudo cp server.crt /etc/mosquitto/certs/
   sudo cp server.key /etc/mosquitto/certs/
}

generate_CA
generate_server
generate_client
copy_keys_to_broker

From Ubuntu. Sorry, it works. It called the script with "sh" and not with "bash". Your explanation is perfect. The problem I see is that I use "platformio" to program (esp32 and visual code) and there is no library that works well with "tls", so I will just use password without tls. Thanks for your tutorial and for responding so quickly.

From Ubuntu. Sorry, it works. It called the script with "sh" and not with "bash". Your explanation is perfect. The problem I see is that I use "platformio" to program (esp32 and visual code) and there is no library that works well with "tls", so I will just use password without tls. Thanks for your tutorial and for responding so quickly.

I am glad that you got it to work; happy hacking!