[ALS-9583][ALS-9584] Own the CSP in the app so 'unsafe-eval' and 'unsafe-inline' can go - #752
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[ALS-9583][ALS-9584] Own the CSP in the app so 'unsafe-eval' and 'unsafe-inline' can go#752JamesPeck wants to merge 5 commits into
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…afe-inline' can go An internal pentest flagged the CSP for allowing 'unsafe-eval' and 'unsafe-inline'. Removing 'unsafe-inline' requires a nonce regenerated per response, which httpd cannot mint to match what SvelteKit renders, so the policy for HTML moves here (kit.csp, nonce mode) and the vhosts keep a strict floor for everything else. 'unsafe-eval' turned out to be unused - nothing in the bundle or any dependency calls eval or new Function - so it goes with no code change. Removing 'unsafe-inline' needed more: app.html's antiClickjack block is deleted (redundant with frame-ancestors 'none' and X-Frame-Options, broken for noscript users, and under a strict policy a single mistake there blanks the page), and components that rendered a style attribute now apply styles through the CSSOM, which CSP does not govern. One exception remains, style-src-attr 'unsafe-inline'. Skeleton's Toaster renders a style attribute server-side on every page from inside the library, so there is no seam to route it through. script-src carries no exception of any kind. app.html seeds Plotly's stylesheet element with the nonce: Plotly writes its ~53 global rules into an element it finds rather than creating an unnonced one, and without the seed those rules are silently dropped and charts render subtly wrong. SvelteKit only puts its nonce in style-src when it emits an inline <style> itself, which it never does at the default inlineStyleThreshold, hence withStyleNonce. Adds font-src 'self' data:, which the current production policy omits - icon fonts are inlined as data: URIs and are blocked today. Adds form-action, base-uri and object-src, and drops data: from script-src. ServerTokens Prod moves into httpd-picsure.conf so it ships with the image and cannot be lost if a mounted vhost drifts.
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Important
This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Pro Plus Run ID: 📝 WalkthroughWalkthroughThe application now uses nonce-based CSP configuration, validates response policies, and supports deployment-specific CSP sources. Dynamic inline styles move to CSSOM attachments or utility classes. Apache responses hide version details, and the HTML template adds a Plotly stylesheet nonce seed. ChangesCSP policy and document wiring
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The PR substantially tightens the application CSP, but its source validation still accepts pre-quoted unsafe keywords, which could weaken that protection if such values are later supplied through configuration. The change is mergeable with explicit owner awareness and a follow-up to normalize and reject these values. Sequence Diagram(s)sequenceDiagram
participant Browser
participant SvelteKitHandle
participant Resolve
participant CSPHelpers
participant RenderedDocument
Browser->>SvelteKitHandle: request document
SvelteKitHandle->>Resolve: resolve(event)
Resolve-->>SvelteKitHandle: response with CSP header
SvelteKitHandle->>CSPHelpers: add and validate style nonce
CSPHelpers-->>SvelteKitHandle: updated CSP or validation result
SvelteKitHandle-->>Browser: response with CSP header
Browser->>RenderedDocument: apply Plotly stylesheet and CSS attachments
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 6 files. (10 skipped: 10 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@svelte.config.js`:
- Around line 7-13: Update the extra() helper to normalize surrounding quotes
from each CSP source before checking for unsafe- keywords and before returning
the source list, ensuring pre-quoted values such as 'unsafe-eval' are rejected
and unquoted values remain unchanged.
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⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro Plus
Run ID: 9c2167ea-5672-4dfd-a4e0-6aef5016c929
📒 Files selected for processing (16)
Dockerfilehttpd-picsure.confsrc/app.htmlsrc/hooks.server.tssrc/lib/components/Popover.sveltesrc/lib/components/Shell.sveltesrc/lib/components/explorer/FacetItem.sveltesrc/lib/components/explorer/FacetPlaceholder.sveltesrc/lib/components/explorer/advanced/AdvancedGroup.sveltesrc/lib/components/tracking/GoogleTracking.sveltesrc/lib/components/tree/RadioTreeNode.sveltesrc/lib/server/csp.tssrc/lib/utilities/style.tssvelte.config.jstests/unit/Csp.test.tstests/unit/CspConfig.test.ts
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The guard tested source.startsWith('unsafe-'), which a pre-quoted "'unsafe-eval'"
slips past. SvelteKit only re-quotes keywords it recognises, and it recognises them
unquoted, so an unrecognised token is emitted into the header verbatim - putting a
working 'unsafe-eval' back into script-src past a check written to prevent exactly
that.
Normalise surrounding quotes before validating and before returning the list. That
also fixes the benign case: 'self' now reaches SvelteKit as self, so it is quoted by
the serialiser rather than passed through by luck.
The emitted policy is unchanged for BDC and the AIO, which set no CSP_EXTRA_* vars.
Keeps only the dev-mode style-src note in lib/server/csp.ts and a one-line marker on the Plotly seed in app.html. The rationale lives in the PR description. No behaviour change: the emitted policy is byte-identical.
Gcolon021
approved these changes
Aug 27, 2026
srpiatt
approved these changes
Aug 27, 2026
The probe is not obvious: assigning the CSS string to a detached element's cssText delegates parsing to the browser, so normalised values and !important priorities survive being replayed through setProperty.
The check is structural - it asks whether style-src carries a nonce - so it fires for anything nonce-seeded in app.html, not just the Plotly stylesheet. Naming Plotly here also pointed at a module that neither this hook nor lib/server/csp.ts references. app.html carries the Plotly explanation on the seed element itself, which is where you look next anyway.
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An internal pentest flagged our Content-Security-Policy for allowing
'unsafe-eval'and'unsafe-inline', which widens what an attacker could do with injected text if input filtering ever fails. This is the application half of the fix; the httpd side is in pic-sure-bdc-infrastructure#217 and pic-sure-all-in-one#256.Removing
'unsafe-inline'needs a nonce regenerated on every response, and httpd cannot mint one that matches what SvelteKit renders. So the policy for HTML pages moves into the app (kit.csp, nonce mode) and the vhosts keep a strict floor for everything else.'unsafe-eval'turned out to be unused — nothing in the bundle or any dependency callsevalornew Function— so it goes with no code change at all.'unsafe-inline'needed more. The antiClickjack block inapp.htmlis deleted: it duplicatesframe-ancestors 'none'andX-Frame-Options, it already breaks for anyone with JavaScript off, and under a strict policy a single mistake there renders the whole app blank. Components that emitted astyleattribute now apply styles through the CSSOM instead, which CSP doesn't govern.One exception survives:
style-src-attr 'unsafe-inline'. Skeleton's<Toaster>renders a style attribute server-side on every page from inside the library, so there's no seam to route it through. Closing it would mean replacing the toast system.script-srccarries no exception of any kind.Two things worth a reviewer's attention.
app.htmlseeds Plotly's stylesheet element with the nonce. Plotly writes its ~53 global rules into an element it finds rather than creating its own unnonced one — without the seed those rules are silently dropped and charts render subtly wrong with no error. SvelteKit only puts its nonce instyle-srcwhen it emits an inline<style>itself, which it never does at the defaultinlineStyleThreshold, hencewithStyleNonce. Because every way that pairing breaks is silent,tests/unit/CspConfig.test.tsasserts the invariant directly, and fails if any directive other thanstyle-src-attrever regains anunsafe-source.font-src 'self' data:is new, and it fixes a pre-existing bug rather than accommodating this change: icon fonts are inlined asdata:URIs,font-srcfalls back todefault-src 'self', and they are blocked in production today.Also adds
form-action,base-uriandobject-src(ZAP flags the first as a missing fallback), dropsdata:fromscript-src, and movesServerTokens Prodintohttpd-picsure.confso it ships with the image and can't be lost if a mounted vhost drifts.Merge order: this one first. The two infra PRs are inert until the rebuilt image is deployed.
Summary by CodeRabbit
Security
Bug Fixes
Tests