backend-security skillA
backend-security is agent-read markdown (skill) from bekaku/java-spring-boot-starter: Use when a change affects who can call an endpoint or see a row — public vs protected routes, JWT/cookie/Bearer/X-API-KEY authentication, refresh tokens and sessions, @PreAuthorize permission codes, owner scoping, signup, OTP, or password reset — in this Spring Boot backend..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Backend Security — Playbook
> **Role:** HOW to change access behavior without opening holes. Binding facts + evidence: `skills/backend/SECURITY.md` (read it too).
> **Requires:** `backend-core`. **Often paired with:** `backend-api`, `backend-data`, `backend-testing`.
## Know this first
- Access is decided in three places: route rules (`WebSecurityConfig`), the credential filter (`JwtTokenFilter`), and method/data checks (`@PreAuthorize` + owner predicates). Check all three.
- The principal is `AppUserDto` with **no authorities**. Use `@permissionChecker.hasPermission('code')`, never `hasRole` / `hasAuthority`.
- The principal holds only `id`, `token`, `accessTokenId`. `auth.getUsername()` / `getEmail()` are `null` — load the user via `AppUserService` if needed.
- JWT requests must also send an `Accept-Apiclient` header (any non-empty value today), or the filter returns `401`. Include it in tests and curl examples.
- `AuthorizationInterceptor` and `CustomPermissionEvaluator` do nothing. `X-User-Id` / `_sid` are not identity.
## Recipe A — protect a new admin endpoint
…Read the whole file at its exact version.
How to install
mdr add bekaku/java-spring-boot-starter/backend-security@git:20260924.15dc64amdr add bekaku/java-spring-boot-starter/backend-security@sha256:0a8543f0fc502e9aPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_yu7lsx66si4oev4m)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260924.15dc64a latest | 2026-09-24 | 15dc64a | 4,861 B | A | view · diff |
| git:20260923.b5acb6d | 2026-09-23 | b5acb6d | 2,155 B | A | view · diff |
| git:20260921.de5eb9f | 2026-09-21 | de5eb9f | 1,378 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4861 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
bekaku/java-spring-boot-starter · 31 stars · license none · pushed 2026-09-24 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_yu7lsx66si4oev4m GET https://markdownregistry.com/api/v1/resolve?ref=bekaku/java-spring-boot-starter/backend-security GET https://markdownregistry.com/api/v1/blob/0a8543f0fc502e9a3deb173ec74cd55d1ca25e561e6715a55d0f3bcf52ce4e18
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