Project: Short Link Creator

A while ago I wrote a quick shortlink redirection tool, so I could use a custom domain rather than something like bit.ly. Since posting a few of these links quite a few people have asked how I do them and shown interest – so here it is, the project write-up for my Redirect Tool.

As with all my web based projects, it’s PHP and uses my standard “site template” back-end. You’ll need MySQL (or something compatible like MariaDB), and access to the web server configuration files for your virtualhost (Apache) or web site (IIS). Continue reading “Project: Short Link Creator”

Project: Certificate Expiry Notification Tool

Application screenshot
Certificate Expiry Notification Tool main screen

I’ve always hated having to set calendar reminders whenever an SSL certificate or Azure AD App Registration certificate expired. What if you forget to set the reminder? What if you’re off sick and miss it? In most cases missing it means disruption of service for a while, but in some cases – for example some of the Apple certificates/tokens used when managing Apple devices in Intune – missing the renewal means you need to re-enroll all your devices. If you’ve restricted profile removal then you’ll have to factory reset them all too.

I had an idea a while ago for a system to track these, and send reminders, and recently I’ve been working on a system to do just this. There’s many different ways I could have gone about this – PowerShell script, or maybe something in PowerApps/Flow, but I wanted a nice web interface, and my weapon of choice for web development is PHP. 

This project will show you a list of certificates and secrets, along with their expiry date and a status indicator (Expired/Warning/Okay). It will automatically pull any Azure AD App Registrations secrets and certificates, and the Intune Apple VPP tokens, Push Notification and Enrollment Program tokens from the Microsoft Graph API. Email alerts can be configured, which will also use the Graph API to send the mail. Continue reading “Project: Certificate Expiry Notification Tool”

PHP: Implement Azure AD login to your site

A while ago I wrote some code to enable one of my PHP projects to log in via authentication with ADFS. I’ve recently updated this to talk directly with Azure AD, and have split this off into a separate project which I’ll share here.

Basically this works using oAuth2, browser sessions, a database and a couple of scripts, and on the Azure AD side you need to create an App Registration. Within this sample project the following flow happens:

  • User lands on index.php. If they do not have a session key cookie, one is generated, and this is stored in the database along with the page the user was attempting to access. They are redirected to login.microsoftonline.com to authenticate.
  • If you allowed authentication from any tenant, and used the common endpoint (rather than your specific tenant ID), the user may be asked to allow your app to access their account. If they are on their home tenancy, you will have already approved this for all users.
  • The user is redirected to the oauth.php file, where a background request is made back to login.microsoftonline.com to obtain a token. Once this has been successful, the user is redirected back to their original destination.
  • If the user lands on index.php and their session key cookie already exists, and exists in the database, and has not expired, they will be allocated that token’s data.
  • If the user lands on index.php with a session key cookie, but it is going to expire in the next 10 minutes, we will perform a refresh request in the background.
  • If the user lands on index.php with a session key cookie, but it’s expired, they are redirected back to login.microsoftonline.com – which may automatically log them back in, or may prompt, depending on their settings.

Continue reading “PHP: Implement Azure AD login to your site”