The original title is: "One login to rule them all: centralized auth for internal tools with Caddy"

Short summary

A practical guide to setting up centralized OAuth2 authentication for internal tools using Caddy and the caddy-security plugin. Covers installing Caddy with plugins, configuring systemd, registering an Azure AD app, and wiring up identity providers, authentication portals, and authorization policies in the Caddyfile.

• •Use Caddy with caddy-security plugin for centralized OAuth2/OIDC auth against Azure AD
• •Covers installation, systemd setup, and Azure AD app registration
• •Three core concepts: identity provider, authentication portal, and per-service authorization policy

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