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CSP Report Review (PROD, 2026-08-03)

Review of Content-Security-Policy-Report-Only violations from PNSPS PROD (https://pnsps.gld.gov.hk), for deciding Apache CSP updates.

Source logs (external):

PNSPS PROD CSP Report 2026-08-03.txt
summary.txt
CSP Issue 1.txt (script-src / eval samples)

Related app docs:

csp-apache.conf.md — Apache header snippets to deploy

Policy in effect at report time

default-src 'self';
base-uri 'self';
object-src 'none';
frame-ancestors 'none';
form-action 'self';
script-src 'self';
style-src 'self' 'unsafe-inline';
style-src-elem 'self' 'unsafe-inline';
img-src 'self' data: https://www.w3.org https://w3.org;
media-src 'self' blob:;
font-src 'self' data:;
connect-src 'self';
upgrade-insecure-requests;
report-uri https://pnsps.gld.gov.hk/api/csp-report

Notes:

Disposition was report (Report-Only); nothing was enforced.
No frame-src → framing falls back to default-src 'self'.

Summary of findings

Most reports are browser / extension noise. Only one directive change is required for app functionality: add frame-src.

Approx. volume	Directive	Blocked	Verdict
~3000	`frame-src`	empty / `data:` (URI often stripped)	App — PDF preview iframes
~1500	`script-src`	`wasm-eval`	Noise — `chrome-extension`
~1400	`font-src`	`fonts.gstatic.com` (Inter / Nunito)	Noise — not app fonts
~500	`img-src`	`https://www.w3.org/WAI/wcag2AA`	Already allowed; mostly doc `404` noise
~240	`font-src`	`at.alicdn.com`, `cdn.yiban.io`, Perplexity CDN	Noise — toolbars / extensions
~180	`style-src-elem`	`fonts.googleapis.com`	Noise — not loaded by app
~70	`script-src`	`eval` (line ~67)	Noise — no app `eval`
rest	various	Kaspersky, Youdao, Quark, `todesktop-internal`, etc.	Noise

App fonts are self-hosted (@fontsource Public Sans / Noto; see public/index.html and src/assets/fonts.css). Google Fonts (Roboto / Inter / Nunito) are not part of the app and must not be allowlisted.

App-owned issue: `frame-src`

Cause

Proof upload preview in src/pages/Proof/Create_FromApp/UploadFileTable.js:

FileReader.readAsDataURL(...) builds a data: URL
window.open("") then document.write an <iframe src="data:...">

With no frame-src, CSP uses default-src 'self', which blocks data: frames. Browsers often report blocked-uri as empty ("") for privacy.

Almost all of these hits are on /proof/create/..., source static/js/4608.*.chunk.js.

Apache fix

frame-src 'self' data: blob:;

Optional follow-up (frontend)

Prefer URL.createObjectURL + blob: for preview (still needs frame-src ... blob:).

Optional: `media-src` and `data:`

Small volume of media-src / data on login and related pages.

Captcha audio already uses blob: (CustomFormWizard.js and similar). Adding data: is low risk:

media-src 'self' blob: data:;

Already covered / not a CSP gap

WCAG badge (`img-src` / `www.w3.org`)

AuthFooter.js loads https://www.w3.org/WAI/wcag2AA. Policy already allows https://www.w3.org and https://w3.org. Many reports had document status-code: 404 (SPA shell). No Apache change required.

Optional hardening: host the badge image locally.

Payment gateway CSS (`epaygateway1.gcis.gov.hk`)

Single style-src-elem hit on /paymentPage/callback with gateway referrer. Card payment uses window.location.assign(redirecturl), not embedded gateway CSS. Do not allowlist unless a real UI break is confirmed.

Do not add to CSP

Requested by reports	Why not
`'unsafe-eval'` / `'wasm-unsafe-eval'`	Extension / injected; app has no `eval`
`fonts.googleapis.com` / `fonts.gstatic.com`	App uses self-hosted fonts
Kaspersky (`*.kis.v2.scr.kaspersky-labs.com`)	AV injection
Perplexity, Youdao, Quark, alicdn, yiban, NetEase CDN	Third-party client tooling
`todesktop-internal`	Desktop wrapper noise
`epaygateway1.gcis.gov.hk` (styles)	Not required for current payment flow

Recommended Apache policy

Use the snippets in csp-apache.conf.md.

Changes vs the 2026-08-03 deployed policy:

Add frame-src 'self' data: blob:;
Change media-src to 'self' blob: data:;

Rollout

Deploy updated Report-Only header.
Watch /api/csp-report for a few days — expect frame-src volume to drop; remaining extension noise is OK.
Promote the same policy to enforcing when app-owned directives look clean.

Adjust report-uri host for UAT vs PROD:

UAT: https://pnspsuat.gld.gov.hk/api/csp-report
PROD: https://pnsps.gld.gov.hk/api/csp-report

Backend reference

Report endpoint: POST /csp-report (context path → /api/csp-report)
Spring Security also sets a short API CSP on API responses (default-src 'self'; script-src 'self'; frame-ancestors 'self'). Frontend/Apache CSP above is what browsers enforce for the SPA document.

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