astro-security · git:20260904.5f1d30f · 2026-09-04 · sha256 cddb9c583c614c73
astro-security git:20260904.5f1d30fA
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--- name: astro-security description: Use when configuring Content Security Policy (CSP) in Astro 7 — security headers, script/style hashes, nonces, or experimentalStaticHeaders. versions: astro: "7" user-invocable: true references: references/csp-overview.md, references/csp-config.md, references/script-directive.md, references/style-directive.md, references/nonces.md, references/static-headers.md, references/templates/csp-basic.md, references/templates/csp-advanced.md related-skills: astro-7, astro-deployment, solid-astro --- <objective> Configures Astro 7's stable Content Security Policy support (`security.csp` in `astro.config.mjs`): automatic SHA-256/384/512 hash generation for bundled scripts and styles, the injected `<meta http-equiv="content-security-policy">` tag, manual hash configuration for external scripts/styles, and nonces for dynamic script injection. Also covers `experimentalStaticHeaders` for emitting CSP as adapter-based HTTP headers instead of a meta tag. States the known limitations: CSP is inactive in `dev` mode (test with `build` + `preview`), incompatible with `<ClientRouter />` view transitions, and unsupported for Shiki's inline styles. Does not cover general deployment adapter setup beyond the CSP header wiring (astro-deployment). </objective> # Astro Security ## Agent Workflow (MANDATORY) Before ANY implementation, spawn 3 agents in parallel, one `Agent` call each with a `name`: 1. **fuse-ai-pilot:explore-codebase** - Analyze existing security config, adapters, headers 2. **fuse-ai-pilot:research-expert** - Verify latest Astro 7 CSP docs via Context7/Exa 3. **mcp__context7__query-docs** - Check CSP compatibility with deployment adapter After implementation, run **fuse-ai-pilot:sniper** for validation. --- ## Overview ### When to Use - Enabling CSP in an Astro project (stable in v6.0.0) - Configuring `security.csp` in `astro.config.mjs` - Adding SHA-256/384/512 hashes for external scripts or styles - Using nonces for dynamic script injection - Setting up `experimentalStaticHeaders` for adapter-based CSP headers ### CSP in Astro Astro 6 ships Content Security Policy as a **stable** feature (previously experimental). When enabled: - Astro automatically generates SHA hashes for all bundled scripts and styles - Injects a `<meta http-equiv="content-security-policy">` in each page's `<head>` - Supports `script-src` and `style-src` directives by default **Limitations:** - Not supported in `dev` mode — test with `build` + `preview` - External scripts and styles require manual hash configuration - Incompatible with `<ClientRouter />` view transitions (use native View Transition API) - Shiki syntax highlighter (inline styles) not currently supported --- ## Reference Guide ### Concepts | Topic | Reference | When to Consult | |-------|-----------|-----------------| | CSP overview | [csp-overview.md](references/csp-overview.md) | Understanding CSP in Astro | | Configuration | [csp-config.md](references/csp-config.md) | All config options | | Script directive | [script-directive.md](references/script-directive.md) | script-src configuration | | Style directive | [style-directive.md](references/style-directive.md) | style-src configuration | | Nonces | [nonces.md](references/nonces.md) | Dynamic script injection | | Static headers | [static-headers.md](references/static-headers.md) | Adapter-based CSP headers | ### Templates | Template | When to Use | |----------|-------------| | [csp-basic.md](references/templates/csp-basic.md) | Basic CSP enable with algorithm | | [csp-advanced.md](references/templates/csp-advanced.md) | Full config with directives + static headers | --- ## Best Practices 1. **Always test with build + preview** — CSP is inactive in dev mode 2. **Start with SHA-512** — strongest hash algorithm 3. **Use `'self'` explicitly** — not included by default in resources 4. **Hash external scripts manually** — compute SHA hashes for CDN resources 5. **Combine with adapter headers** — use `experimentalStaticHeaders` for Vercel/Netlify --- ## Forbidden - Testing CSP in `dev` mode (doesn't work — always use `build + preview`) - Using `<ClientRouter />` with CSP enabled - Forgetting to add `'self'` when using `resources` array - Adding `unsafe-inline` (defeats purpose of CSP)