security: enforce renderer CSP and externalize theme bootstrap#172
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Review Summary by QodoEnforce renderer CSP and externalize theme bootstrap
WalkthroughsDescription• Add strict Content-Security-Policy meta tag to renderer HTML • Externalize dark-mode bootstrap logic to separate JavaScript file • Implement CSP regression tests ensuring no unsafe directives • Document renderer CSP policy requirements and constraints File Changes1. src/renderer/public/index.html
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Summary of ChangesHello @Mehdi-Bl, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the application's security posture by enforcing a strict Content Security Policy within the renderer process. It also improves maintainability by refactoring the theme initialization logic into a dedicated external script, which is a necessary step to comply with the new security policy. These changes collectively reduce the attack surface and ensure a more robust and secure application environment. Highlights
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Dependency Review✅ No vulnerabilities or license issues found.Scanned FilesNone |
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Code Review
This pull request significantly improves the application's security by introducing a Content Security Policy (CSP) and removing inline scripts, alongside externalizing the theme bootstrap logic. However, a medium-severity vulnerability was identified where the connect-src directive is overly permissive, potentially allowing connections to insecure endpoints and weakening XSS protection. Further strengthening of the CSP is recommended, along with making the new CSP tests more robust.
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | ||
| <meta | ||
| http-equiv="Content-Security-Policy" | ||
| content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: assets:; font-src 'self' data:; connect-src 'self' https: http:; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'none'" |
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The connect-src directive in the Content Security Policy is overly permissive, allowing connections over https: and, more critically, http:. This constitutes a medium-severity vulnerability (Insecure Communication) as allowing http: undermines HTTPS security, making the application vulnerable to man-in-the-middle attacks and data exfiltration. It's strongly recommended to restrict this directive to 'self' and only specific, trusted domains, prioritizing https: for all external connections.
| content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: assets:; font-src 'self' data:; connect-src 'self' https: http:; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'none'" | |
| content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: assets:; font-src 'self' data:; connect-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'none'" |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | ||
| <meta | ||
| http-equiv="Content-Security-Policy" | ||
| content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: assets:; font-src 'self' data:; connect-src 'self' https: http:; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'none'" |
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The img-src directive includes assets:, which is not a standard CSP source keyword. If this is intended to allow images from a local assets directory, the 'self' keyword should already cover this. If assets: refers to a custom protocol scheme (e.g., in Electron), it would be beneficial to add a comment for clarity. If it's a typo or not needed, it should be removed to keep the policy clean.
| content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: assets:; font-src 'self' data:; connect-src 'self' https: http:; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'none'" | |
| content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data:; font-src 'self' data:; connect-src 'self' https: http:; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'none'" |
| it('defines a strict CSP policy without unsafe script/style exceptions', () => { | ||
| const indexHtml = readRendererIndex(); | ||
| const cspMatch = indexHtml.match( | ||
| /<meta\s+http-equiv="Content-Security-Policy"\s+content="([^"]+)"/ | ||
| ); | ||
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| expect(cspMatch).not.toBeNull(); | ||
| const cspValue = cspMatch?.[1] ?? ''; | ||
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| expect(cspValue).toContain("default-src 'self'"); | ||
| expect(cspValue).toContain("script-src 'self'"); | ||
| expect(cspValue).toContain("style-src 'self'"); | ||
| expect(cspValue).toContain("object-src 'none'"); | ||
| expect(cspValue).toContain("base-uri 'none'"); | ||
| expect(cspValue).not.toContain("'unsafe-inline'"); | ||
| expect(cspValue).not.toContain("'unsafe-eval'"); | ||
| }); |
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This test is a great start for ensuring the CSP is enforced. To make it more robust and prevent accidental weakening of the policy in the future, consider using a snapshot test for the CSP value. This will ensure the entire policy is tracked and any changes must be explicitly reviewed and approved.
| it('defines a strict CSP policy without unsafe script/style exceptions', () => { | |
| const indexHtml = readRendererIndex(); | |
| const cspMatch = indexHtml.match( | |
| /<meta\s+http-equiv="Content-Security-Policy"\s+content="([^"]+)"/ | |
| ); | |
| expect(cspMatch).not.toBeNull(); | |
| const cspValue = cspMatch?.[1] ?? ''; | |
| expect(cspValue).toContain("default-src 'self'"); | |
| expect(cspValue).toContain("script-src 'self'"); | |
| expect(cspValue).toContain("style-src 'self'"); | |
| expect(cspValue).toContain("object-src 'none'"); | |
| expect(cspValue).toContain("base-uri 'none'"); | |
| expect(cspValue).not.toContain("'unsafe-inline'"); | |
| expect(cspValue).not.toContain("'unsafe-eval'"); | |
| }); | |
| it('defines a strict CSP policy', () => { | |
| const indexHtml = readRendererIndex(); | |
| const cspMatch = indexHtml.match( | |
| /<meta\s+http-equiv="Content-Security-Policy"\s+content="([^"_]+)"/ | |
| ); | |
| expect(cspMatch).not.toBeNull(); | |
| const cspValue = cspMatch?.[1] ?? ''; | |
| // A snapshot test ensures the entire policy is tracked. | |
| // Any change to the CSP will require the snapshot to be updated, | |
| // making regressions easier to spot during code review. | |
| expect(cspValue).toMatchSnapshot(); | |
| // It's still a good idea to keep explicit checks for critical items. | |
| expect(cspValue).not.toContain("'unsafe-inline'"); | |
| expect(cspValue).not.toContain("'unsafe-eval'"); | |
| }); |
Code Review by Qodo
1. qa:screenshot not run for UI change
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| document.documentElement.classList.remove('dark'); | ||
| } | ||
| </script> | ||
| <script src="./theme-bootstrap.js"></script> |
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1. qa:screenshot not run for ui change 📘 Rule violation ✓ Correctness
The PR modifies startup UI rendering behavior by replacing the inline dark-mode bootstrap script with an external theme-bootstrap.js file, which qualifies as a UI behavior change. The PR description's validation section omits npm run qa:screenshot, violating the requirement to run screenshot QA whenever UI behavior or layout changes are introduced.
Agent Prompt
## Issue description
The PR modifies startup UI rendering behavior — the inline dark-mode bootstrap script has been externalized to `theme-bootstrap.js` — but `npm run qa:screenshot` was not executed or reported in the PR validation steps.
## Issue Context
Compliance rule ID 4 requires the screenshot QA gate (`npm run qa:screenshot`) to pass whenever UI behavior or layout changes are introduced. The dark-mode bootstrap change affects the initial visual state of the application (prevents flash of light theme), which qualifies as a UI behavior change. The catalog at `tests/catalog.md` line 18 also lists `npm run qa:screenshot` as the designated UI screenshot gate command.
## Fix Focus Areas
- Run `npm run qa:screenshot` locally and confirm zero failures
- Add `npm run qa:screenshot` to the PR description validation section
- src/renderer/public/index.html[12-12]
- src/renderer/public/theme-bootstrap.js[1-22]
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| <meta | ||
| http-equiv="Content-Security-Policy" | ||
| content="default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: assets:; font-src 'self' data:; connect-src 'self' https: http:; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; form-action 'none'" | ||
| /> |
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2. Frame-ancestors ignored in meta csp 🐞 Bug ⛨ Security
The CSP specification explicitly prohibits frame-ancestors inside a `<meta http-equiv='Content-Security-Policy'>` tag — browsers and Electron's Chromium engine are required to silently ignore it. Since Electron loads the renderer via loadFile() (file:// protocol) with no HTTP response headers and no onHeadersReceived hook, the intended clickjacking protection is completely non-operational.
Agent Prompt
## Issue description
The `frame-ancestors 'none'` CSP directive is placed inside a `<meta http-equiv='Content-Security-Policy'>` tag. Per the CSP specification, this directive MUST be ignored when delivered via a meta tag — it is only effective via HTTP response headers. Electron loads the renderer using `loadFile()` (file:// protocol) with no HTTP headers, so the protection is completely non-functional.
## Issue Context
The directive appears in the meta CSP tag in `src/renderer/public/index.html`. The main process in `src/main/index.ts` uses `mainWindow.loadFile()` and has no `session.webRequest.onHeadersReceived` hook to inject HTTP-level CSP headers.
## Fix Focus Areas
- `src/renderer/public/index.html[8-8]` — Remove `frame-ancestors 'none'` from the `content` attribute of the meta CSP tag to avoid false security confidence
- `src/main/index.ts[264-310]` — Optionally add a `session.defaultSession.webRequest.onHeadersReceived` handler in `bootstrapApp()` to inject `Content-Security-Policy: frame-ancestors 'none'` as a real HTTP response header if framing protection is a genuine requirement
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Summary
src/renderer/public/index.htmlsrc/renderer/public/theme-bootstrap.jsValidation
Performance Snapshot (stress)
dist/benchmarks/ipc-latency-1771483000059.jsonfs:getDirectoryTree-large-flat36.17ms, p95:38.37ms, p99:38.37msdist/benchmarks/event-loop-lag-1771483000380.jsonfs:getDirectoryTree-event-loop-lag1ms, p95:4ms, p99:5msIssue