friloo/wp-m365-login
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Add M365 Login plugin: Microsoft Entra ID sign-in for existing users

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Adds a WordPress plugin that places a customisable "Sign in with
Microsoft" button on wp-login.php and signs existing users in via the
OpenID Connect authorization code flow with PKCE. Users are matched by
e-mail address only; no accounts are created.

Security: single-use state/nonce bound to an HttpOnly cookie, ID token
signature verification against Microsoft's JWKS (RS256 only) with
issuer/audience/tenant/expiry/nonce checks, optional tenant pinning,
account binding to the Microsoft object ID, e-mail domain allow-list,
client secret encrypted at rest (AES-256-GCM).

Admin: settings screen with connection, button and security tabs, live
button preview, colour presets, media-library icon picker, redirect URI
copy button and tenant connectivity test.

Packaging for WordPress.org: readme.txt with External services section,
GPL-2.0 license, uninstall.php, POT + German translations, .distignore,
build script, PHPCS config and CI running Plugin Check.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JJxAHYdMfKPoN4koRc4Ci2
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friloo 2026-09-22 14:21:10 +00:00
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# Changelog
All notable changes to this project are documented in this file. The format follows
[Keep a Changelog](https://keepachangelog.com/) and the plugin adheres to
[Semantic Versioning](https://semver.org/).
## [1.0.0] – 2026-09-22
### Added
- "Sign in with Microsoft" button on `wp-login.php` (OpenID Connect authorization code flow with PKCE).
- Matching of existing WordPress users by e-mail address (optional UPN fallback), no user provisioning.
- Settings screen (Settings → M365 Login) with connection, button and security tabs, live button preview, colour presets, media-library icon picker, redirect-URI copy button and tenant connectivity test.
- ID token verification against Microsoft's JWKS (RS256, issuer, audience, tenant, expiry, nonce).
- Encrypted client secret storage (AES-256-GCM).
- Account binding to the Microsoft object ID, e-mail domain allow-list.
- `[m365_login_button]` shortcode and developer hooks.
- German translation.