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Merge pull request #1200 from J3vb/feat/narrow-tauri-capabilities

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feat(client): narrow Tauri HTTP capability scope
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J3vb
2026-07-20 16:25:26 +02:00
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parent 4dacb3cd4c 59ec405595
commit 52659e4a39
5 changed files with 253 additions and 23 deletions
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docs/security.md
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@@ -51,7 +51,10 @@ The Tauri desktop client implements the following security measures:
### Tauri Capabilities (Least Privilege)
- Filesystem write access is scoped to `$APPDATA/**` and `$APPLOG/**` only
- DevTools command is gated behind the `devtools` feature flag (excluded from release builds)
- HTTP fetch permissions are restricted to `https://` origins
- HTTP fetch is restricted to `https://` origins plus `http://127.0.0.1:*` (the Rust TOFU proxy's loopback tunnel), and **denies** `https://localhost[:*]` and `https://127.0.0.1[:*]` — no legitimate flow reaches loopback over https, so the deny list keeps the renderer from probing other local services
- `http:allow-fetch` is the **only** URL-scoped HTTP identifier. `tauri-plugin-http` validates the URL exactly once, in the `fetch` command; `fetch_send` and `fetch_read_body` operate on an already-validated `ResourceId` and never consult a scope, so `allow`/`deny` blocks on those identifiers are inert and were removed rather than left in place advertising a control that does not exist
- The `https://*` wildcard cannot be removed today: link previews (`embeds.ts`) fetch arbitrary user-posted URLs by design, and Tauri scopes per *command*, not per JS caller. Bounded in TypeScript by `isPrivateHost`/`isBlockedForPreview`, a 5 s timeout and a 50 KB body cap; the response is regex-scraped for `og:` tags and never executed
- Regression-guarded by `tests/unit/capabilities-scope.test.ts`; rationale and the follow-up that would remove the wildcard are in [docs/plans/tauri-capability-narrowing.md](plans/tauri-capability-narrowing.md)
### TLS and Certificate Pinning (TOFU)
- Self-signed certificates are supported via Trust-On-First-Use (TOFU) pinning
@@ -85,7 +88,7 @@ The Tauri desktop client implements the following security measures:
- Server auto-updates depend on a dedicated pinned minisign/Ed25519 server release key in [Server/updater/server_update_public_key.txt](Server/updater/server_update_public_key.txt) and a signed release manifest that binds the shipped binary hash to the release version; Windows Authenticode/SmartScreen code signing is still separate work
- The Tenor API key is hardcoded (Google's public anonymous key) — consider build-time injection for production
- CSP `connect-src` allows `https:` to any host (necessary for self-hosted server URLs not known at build time)
- CSP `connect-src` allows `https:` to any host (necessary for self-hosted server URLs not known at build time). Because of this, narrowing the Tauri `http:allow-fetch` scope alone would not bound exfiltration from a compromised renderer — the webview's own `fetch` reaches the same hosts without going through the plugin. Closing that requires narrowing `connect-src` and moving the link-preview fetch into Rust in the same change
## Security Hardening Checklist for Operators