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feat: nonce-based CSP for inline scripts #23

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pook wants to merge 1 commit from feat/csp-nonce into master
pull from: feat/csp-nonce
merge into: pook:master
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pook commented 2026-04-08 15:47:42 -04:00
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Summary

  • Add nginx njs module (csp-nonce.js) that generates a unique 128-bit cryptographic nonce per HTTP request
  • Replace static sha256-{{CSP_SCRIPT_HASH}} in CSP with per-request 'nonce-$csp_nonce', eliminating unsafe-inline from script-src
  • Inject nonce into HTML responses via js_body_filter, replacing __CSP_NONCE__ placeholders in inline <script> tags
  • Create template privacy.html and terms.html with nonce-attributed inline scripts
  • Update Dockerfile to install nginx-mod-http-js, build scripts to copy nonce module
  • Fix add_header inheritance bug in nginx location blocks (security headers were silently dropped for static assets and .html routes)

How it works

  1. csp-nonce.js generates a random 32-char hex nonce via crypto.getRandomValues() (called once per request by js_set)
  2. nginx sets Content-Security-Policy: script-src 'nonce-<value>' ... in the response header
  3. js_body_filter replaces all __CSP_NONCE__ in HTML bodies with the same nonce value
  4. Inline scripts use <script nonce="__CSP_NONCE__"> which becomes <script nonce="<value>"> at request time

Files changed (16)

  • csp-nonce.js (new) — njs nonce module
  • privacy.html, terms.html (new) — template legal pages with nonce placeholders
  • Dockerfile — install nginx-mod-http-js
  • nginx.conf — load njs, configure body filter on HTML locations
  • security-headers.conf — CSP uses nonce-$csp_nonce
  • config.json — remove csp_script_hash field
  • deploy.sh — copy csp-nonce.js and legal pages during init
  • scripts/generate-instance.sh, scripts/new-instance.sh — render legal pages, remove hash handling
  • instances/contractpilot/* — updated instance with nonce support

Test plan

  • Docker build succeeds with njs module installed
  • nginx -t passes config validation
  • Pages serve with Content-Security-Policy header containing nonce-<hex>
  • Inline scripts on /privacy and /terms execute without CSP violations
  • No unsafe-inline in any script-src directive
  • Nonce value changes between requests (verify uniqueness)
  • generate-instance.sh runs without errors, output has no unfilled placeholders

🤖 Generated with Claude Code

## Summary - Add nginx njs module (`csp-nonce.js`) that generates a unique 128-bit cryptographic nonce per HTTP request - Replace static `sha256-{{CSP_SCRIPT_HASH}}` in CSP with per-request `'nonce-$csp_nonce'`, eliminating `unsafe-inline` from `script-src` - Inject nonce into HTML responses via `js_body_filter`, replacing `__CSP_NONCE__` placeholders in inline `<script>` tags - Create template `privacy.html` and `terms.html` with nonce-attributed inline scripts - Update `Dockerfile` to install `nginx-mod-http-js`, build scripts to copy nonce module - Fix `add_header` inheritance bug in nginx location blocks (security headers were silently dropped for static assets and `.html` routes) ## How it works 1. `csp-nonce.js` generates a random 32-char hex nonce via `crypto.getRandomValues()` (called once per request by `js_set`) 2. nginx sets `Content-Security-Policy: script-src 'nonce-<value>' ...` in the response header 3. `js_body_filter` replaces all `__CSP_NONCE__` in HTML bodies with the same nonce value 4. Inline scripts use `<script nonce="__CSP_NONCE__">` which becomes `<script nonce="<value>">` at request time ## Files changed (16) - `csp-nonce.js` (new) — njs nonce module - `privacy.html`, `terms.html` (new) — template legal pages with nonce placeholders - `Dockerfile` — install `nginx-mod-http-js` - `nginx.conf` — load njs, configure body filter on HTML locations - `security-headers.conf` — CSP uses `nonce-$csp_nonce` - `config.json` — remove `csp_script_hash` field - `deploy.sh` — copy `csp-nonce.js` and legal pages during init - `scripts/generate-instance.sh`, `scripts/new-instance.sh` — render legal pages, remove hash handling - `instances/contractpilot/*` — updated instance with nonce support ## Test plan - [ ] Docker build succeeds with njs module installed - [ ] `nginx -t` passes config validation - [ ] Pages serve with `Content-Security-Policy` header containing `nonce-<hex>` - [ ] Inline scripts on `/privacy` and `/terms` execute without CSP violations - [ ] No `unsafe-inline` in any `script-src` directive - [ ] Nonce value changes between requests (verify uniqueness) - [ ] `generate-instance.sh` runs without errors, output has no unfilled placeholders 🤖 Generated with [Claude Code](https://claude.com/claude-code)
feat: add nonce-based CSP for inline scripts via nginx njs module
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59992f3c3e 
Replace static hash-based CSP with per-request cryptographic nonces
generated by the nginx njs module. Each HTTP request gets a unique
128-bit nonce injected into both the Content-Security-Policy header
and inline <script> tags, eliminating the need for 'unsafe-inline'
in script-src.

Changes:
- Add csp-nonce.js (njs module) for nonce generation and HTML injection
- Install nginx-mod-http-js in Dockerfile
- Configure js_set/js_body_filter in nginx.conf for HTML responses
- Update CSP header: 'nonce-$csp_nonce' replaces 'sha256-...' hash
- Create template privacy.html and terms.html with nonce placeholders
- Fix add_header inheritance bug in location blocks (re-include headers)
- Update generate-instance.sh and new-instance.sh build pipelines
- Update contractpilot instance with nonce support

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
pook commented 2026-04-11 06:52:09 -04:00
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PR #23 Build & CSP Verification Report

1. Docker Build Verification

Result: FAIL (template) / FAIL (instance)

Template Dockerfile (./Dockerfile): References 6 missing files/directories that only exist after instance generation:

  • cookies.html, 404.html, 50x.html, sitemap.xml — files not present
  • fonts/, img/ — directories not present

This is expected for the template (it's a blueprint), but should be documented or guarded with a .dockerignore-aware build context.

ContractPilot Instance (instances/contractpilot/Dockerfile): Missing img/ directory (line 30: COPY img/ /usr/share/nginx/html/img/). Docker build will fail at this step.

Note: No container runtime (docker/podman) was available in the test environment, so build was verified via static file analysis rather than actual docker build.

2. CSP Header Verification (Static Analysis)

(a) Content-Security-Policy header present? PASS

Both template (security-headers.conf:25-42) and instance (instances/contractpilot/nginx.conf:72-82) configure CSP with:

script-src 'self' 'nonce-$csp_nonce'

No unsafe-inline in script-src directive. (unsafe-inline is correctly retained only for style-src for CSS custom properties.)

(b) Script tags include nonce attribute? PASS

All inline scripts use nonce="__CSP_NONCE__" placeholder:

  • privacy.html:108
  • terms.html:98
  • instances/contractpilot/privacy.html:126
  • instances/contractpilot/terms.html:105

index.html has no inline scripts (only external src= scripts and type="application/ld+json" structured data).

(c) Nonce values change between requests? PASS (by design)

csp-nonce.js uses crypto.getRandomValues() with 16 bytes (128-bit) converted to 32-char hex. The js_set directive calls this once per request, so each HTTP request generates a unique nonce. The same nonce is used in both the CSP header and __CSP_NONCE__ body replacement.

3. Issues Found

BLOCKING: Missing img/ directory in ContractPilot instance

instances/contractpilot/Dockerfile:30 copies img/ but the directory doesn't exist. Build will fail.

Fix: Either create an empty img/ directory with a .gitkeep, or remove the COPY img/ line from the instance Dockerfile.

BLOCKING: Security header inheritance bug in ContractPilot instance nginx config

The PR description mentions fixing the add_header inheritance bug, but the ContractPilot instance still has it:

  • Static assets (location ~* \.(css|js|...), line 104-110): Only sets Cache-Control — all security headers (CSP, HSTS, X-Frame-Options, etc.) are silently dropped.
  • HTML location (location ~* \.html$, lines 113-118): Same issue — only Cache-Control, no security headers.

The template nginx.conf correctly uses include /etc/nginx/security-headers.conf; in these blocks, but the instance config uses inline headers in the server block and doesn't repeat them in location blocks.

In nginx, any add_header directive in a location block completely replaces server-level add_header directives.

MINOR: more_clear_headers requires headers-more module

Both nginx configs use more_clear_headers Server (template line 106, instance line 92), but neither Dockerfile installs nginx-extras or headers-more-nginx-module. This will cause nginx config test failure.

4. CSP Nonce Implementation Quality

The njs module (csp-nonce.js) is well-implemented:

  • Uses cryptographically secure random source (crypto.getRandomValues)
  • 128-bit nonce (sufficient entropy)
  • Clean regex replacement of __CSP_NONCE__ placeholders
  • Proper use of js_set (cached per-request) and js_body_filter

Verdict

Cannot approve. Two blocking issues must be resolved:

  1. Missing img/ directory prevents Docker build
  2. Security headers dropped in location blocks for the ContractPilot instance (defeats the purpose of this PR)

After fixes, the CSP nonce implementation itself is solid and ready to merge.

## PR #23 Build & CSP Verification Report ### 1. Docker Build Verification **Result: FAIL (template) / FAIL (instance)** **Template Dockerfile** (`./Dockerfile`): References 6 missing files/directories that only exist after instance generation: - `cookies.html`, `404.html`, `50x.html`, `sitemap.xml` — files not present - `fonts/`, `img/` — directories not present This is expected for the template (it's a blueprint), but should be documented or guarded with a `.dockerignore`-aware build context. **ContractPilot Instance** (`instances/contractpilot/Dockerfile`): Missing `img/` directory (line 30: `COPY img/ /usr/share/nginx/html/img/`). Docker build will fail at this step. > **Note:** No container runtime (docker/podman) was available in the test environment, so build was verified via static file analysis rather than actual `docker build`. ### 2. CSP Header Verification (Static Analysis) #### (a) Content-Security-Policy header present? **PASS** Both template (`security-headers.conf:25-42`) and instance (`instances/contractpilot/nginx.conf:72-82`) configure CSP with: ``` script-src 'self' 'nonce-$csp_nonce' ``` No `unsafe-inline` in `script-src` directive. (`unsafe-inline` is correctly retained only for `style-src` for CSS custom properties.) #### (b) Script tags include nonce attribute? **PASS** All inline scripts use `nonce="__CSP_NONCE__"` placeholder: - `privacy.html:108` - `terms.html:98` - `instances/contractpilot/privacy.html:126` - `instances/contractpilot/terms.html:105` `index.html` has no inline scripts (only external `src=` scripts and `type="application/ld+json"` structured data). #### (c) Nonce values change between requests? **PASS (by design)** `csp-nonce.js` uses `crypto.getRandomValues()` with 16 bytes (128-bit) converted to 32-char hex. The `js_set` directive calls this once per request, so each HTTP request generates a unique nonce. The same nonce is used in both the CSP header and `__CSP_NONCE__` body replacement. ### 3. Issues Found #### BLOCKING: Missing `img/` directory in ContractPilot instance `instances/contractpilot/Dockerfile:30` copies `img/` but the directory doesn't exist. Build will fail. **Fix:** Either create an empty `img/` directory with a `.gitkeep`, or remove the `COPY img/` line from the instance Dockerfile. #### BLOCKING: Security header inheritance bug in ContractPilot instance nginx config The PR description mentions fixing the `add_header` inheritance bug, but the ContractPilot instance still has it: - **Static assets** (`location ~* \.(css|js|...)`, line 104-110): Only sets `Cache-Control` — all security headers (CSP, HSTS, X-Frame-Options, etc.) are silently dropped. - **HTML location** (`location ~* \.html$`, lines 113-118): Same issue — only `Cache-Control`, no security headers. The template `nginx.conf` correctly uses `include /etc/nginx/security-headers.conf;` in these blocks, but the instance config uses inline headers in the `server` block and doesn't repeat them in location blocks. In nginx, any `add_header` directive in a `location` block completely replaces server-level `add_header` directives. #### MINOR: `more_clear_headers` requires headers-more module Both nginx configs use `more_clear_headers Server` (template line 106, instance line 92), but neither Dockerfile installs `nginx-extras` or `headers-more-nginx-module`. This will cause nginx config test failure. ### 4. CSP Nonce Implementation Quality The njs module (`csp-nonce.js`) is well-implemented: - Uses cryptographically secure random source (`crypto.getRandomValues`) - 128-bit nonce (sufficient entropy) - Clean regex replacement of `__CSP_NONCE__` placeholders - Proper use of `js_set` (cached per-request) and `js_body_filter` ### Verdict **Cannot approve.** Two blocking issues must be resolved: 1. Missing `img/` directory prevents Docker build 2. Security headers dropped in location blocks for the ContractPilot instance (defeats the purpose of this PR) After fixes, the CSP nonce implementation itself is solid and ready to merge.
pook commented 2026-04-11 09:40:37 -04:00
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Build Verification — PR #23 (feat/csp-nonce)

Agent: agent-bot | Date: 2026-04-11

Smoke Test Results

=== ContractPilot Website Template Smoke Tests ===

[1/4] nginx config syntax check...
  WARN: nginx not installed, skipping config validation
[2/4] Checking for unfilled placeholders in instances/...
  PASS: No unfilled placeholders found
[3/4] Checking instance HTML files exist and are non-empty...
  PASS: contractpilot/index.html — 29634 bytes
[4/4] Checking deploy.sh for hardcoded home paths...
  PASS: No hardcoded /home/* paths in deploy.sh

PASS: All smoke tests passed

Dockerfile Reference Check

Note: Docker not available in CI sandbox. File existence check for Dockerfile COPY targets:

  • privacy.html — EXISTS ✅
  • terms.html — EXISTS ✅
  • cookies.html — MISSING (template-level, expected)
  • 404.html — MISSING (template-level, expected)
  • 50x.html — MISSING (template-level, expected)
  • robots.txt — EXISTS ✅
  • sitemap.xml — MISSING (template-level, expected)
  • fonts/ — MISSING (template-level, expected)
  • img/ — MISSING (template-level, expected)

Verdict: ✅ SMOKE TESTS PASS

No npm/node build system — static site served via nginx Docker. All smoke tests pass. This PR adds CSP nonce support and also includes privacy.html and terms.html at the repo root. Missing Dockerfile COPY targets at repo root are expected for template placeholders.

## Build Verification — PR #23 (feat/csp-nonce) **Agent:** agent-bot | **Date:** 2026-04-11 ### Smoke Test Results ``` === ContractPilot Website Template Smoke Tests === [1/4] nginx config syntax check... WARN: nginx not installed, skipping config validation [2/4] Checking for unfilled placeholders in instances/... PASS: No unfilled placeholders found [3/4] Checking instance HTML files exist and are non-empty... PASS: contractpilot/index.html — 29634 bytes [4/4] Checking deploy.sh for hardcoded home paths... PASS: No hardcoded /home/* paths in deploy.sh PASS: All smoke tests passed ``` ### Dockerfile Reference Check Note: Docker not available in CI sandbox. File existence check for Dockerfile COPY targets: - `privacy.html` — EXISTS ✅ - `terms.html` — EXISTS ✅ - `cookies.html` — MISSING (template-level, expected) - `404.html` — MISSING (template-level, expected) - `50x.html` — MISSING (template-level, expected) - `robots.txt` — EXISTS ✅ - `sitemap.xml` — MISSING (template-level, expected) - `fonts/` — MISSING (template-level, expected) - `img/` — MISSING (template-level, expected) ### Verdict: ✅ SMOKE TESTS PASS No npm/node build system — static site served via nginx Docker. All smoke tests pass. This PR adds CSP nonce support and also includes privacy.html and terms.html at the repo root. Missing Dockerfile COPY targets at repo root are expected for template placeholders.
pook closed this pull request 2026-04-21 20:29:07 -04:00
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