Random password guest generator for routers using Asuswrt-Merlin firmware
Setting a random password for guest wifi in Asuswrt-Merlin firmware

This script is a personal improvement of the original one. You can find it here -> Setting a random password for guest wifi. All credit goes to the author of the original script

The main changes are:

1 Add gotify notification
2 Replace the API generator with this one passwordwolf. It appear that passwd.me is no longer active
3 Fix the openssl instruction
4 remove the e-mail functionality since I am still working to understand it

These may require additional software to be installed over & above the default busy box installation so if you find the the scritp is not working check the error message. Also, I am using a Gotify server installed in my local network

There are four methodes to get a password:

1 The password is made up of a phrase selected from a text file followed by a random three digit number
2 The password is made up using the openssl rand option
3 The password is made up accesing the API passwordwolf using the curl command
4 If none of the previous alternatives works at the moment of running the script, a simple pass is defined using date +"%A%B%d"\

Install

To install this very simple scripts you need to copy both the script and the phrases file in /jffs/scripts/ folder in your router:

curl --retry 3 "https://raw.githubusercontent.com/cerealconyogurt/Random-password-asuswrt-merlin/main/newpass.sh" -o "/jffs/scripts/newpass" && chmod 0755 /jffs/scripts/newpass

curl --retry 3 "https://raw.githubusercontent.com/cerealconyogurt/Random-password-asuswrt-merlin/main/newpass-phrases.txt" -o "/jffs/scripts/newpass-phrases"

and ensure you make it executable chmod a+rx /jffs/scripts/newpass

Setting up

There are 3 methodes you can select within the script:

getrandomphrase: These phrases are the basis for the password - I've chosen bird names from my country, but you could use anything you want. Ensure that each phrase is at least 7 characters long (+3 for random number = min length of 10 characters) and that there are no blank lines. Try and have a reasonable number of entries in here, or you will end up with the same phrase being picked on a regular basis. The author of this script had in his file more than 70 different bands! Way to go!

getrandopenssl: This fucntion uses openssl rand function to create a password. Quite simple indeed but maybe more problematic to communicate the pass to the guest/famaly

getpasswfromapi: This fucntion uses an API call to create a pass following some rules. Pretty simple as well

In order to chose what functions you want to use, you just need to uncomment the function in the script:

## Now call the function we want to use
# getrandomphrase
# getrandopenssl
# getpasswfromapi

To get this process to run at 4am each day, add the following into /jffs/scripts/services-start and make it executable :

#!/bin/sh
cru a ResetGuestPassword "0 4 * * * /jffs/scripts/newpass"

This will set it up so that the script will be run at 4am every day.

Reboot your router, and you're done!

END