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feat: serve pdf.js from this origin instead of a CDN
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Browse Source 
The Site pulled pdf.js 3.11.174 from cdnjs with no integrity attribute, and the
policy trusted the whole of cdnjs.cloudflare.com for both script-src and
worker-src. Anything that host served would have executed, and a customer
measuring a PDF sheet depended on it being reachable.

Vendor both files instead of pinning a hash: it removes the dependency rather
than constraining it, and lets the policy name only 'self'. Provenance and
SHA-256 digests are recorded in local/static/vendor/README.md, verified on
download against the SRI digests cdnjs publishes for that release.

cdnjs is now absent from script-src, worker-src and connect-src in both gateway
templates. Workers are 'self' plus blob:, which the Site needs for the worker it
constructs itself.

Verified in a browser against the running stack: pdf.js loads from /vendor/, the
blob worker starts, and a real seven-page PDF parses with no CSP violation. Both
browser suites and the full integration suite pass.

The version is deliberately unchanged. 3.11.174 is old, but its known eval path
is already closed by isEvalSupported:false, and upgrading is an API change that
needs its own testing rather than riding along with this.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Cauê Faleiros
2026-09-21 13:56:02 -03:00
parent 9926d3ab55
commit da903db32a
7 changed files with 103 additions and 7 deletions
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22
ROADMAP.md
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@@ -253,10 +253,26 @@ Dockerfiles default to mutable `python:3.12-slim` / `nginx:1.28-alpine`, the
workflow passes no digest build-args, and `--pull` makes builds non-reproducible —
while `PORTAINER.md` documents digest-pinned immutable bases.
### `[ ]` 2.7 — pdf.js loaded from CDN without integrity `(F11)`
### `[x]` 2.7 — pdf.js loaded from CDN without integrity `(F11)`
3.11.174 from `cdnjs`, no SRI, and CSP allows the whole host for `script-src` **and**
`worker-src`. Vendor the asset or pin `integrity` and narrow the CSP to the exact path.
Vendored rather than integrity-pinned, so the Site no longer depends on a third
party being reachable and honest when a customer opens it. Both files are served
from this origin and their provenance is recorded in `local/static/vendor/README.md`,
verified against the SRI digests cdnjs publishes for 3.11.174.
`cdnjs.cloudflare.com` is gone from `script-src`, `worker-src` and `connect-src` in
both gateway templates: scripts and workers are now `'self'` plus `blob:` for the
worker the Site builds itself.
Verified in a browser against the running stack: pdf.js loads from `/vendor/`,
the blob worker starts, and a real 7-page PDF parses with no CSP violation. Both
browser suites and the full integration suite pass.
**Still open: the version.** 3.11.174 is old. GHSA-wgrm-67xf-hhpq is mitigated —
`dtf-site.html` already passes `isEvalSupported: false`, which is the documented
workaround — but staying on it indefinitely is not a posture. Upgrading is an API
change rather than a file swap and needs its own browser testing, so it is
deliberately not bundled here.
### `[ ]` 2.8 — Single shared operator credential `(F12)`