fix(tor): close 8 network traffic leaks — fail-closed when Tor expected
SECURITY: With Tor ON, all HTTP traffic now routes through SOCKS proxy. Previously only relay WebSocket connections used Tor; 8 other egress paths created bare OkHttpClient() instances bypassing Tor entirely. Fail-closed behavior: - When Tor expected but bootstrapping → dead SOCKS proxy on port 1 (requests fail instead of leaking IP) - lateinit var crashes on misconfiguration (loud failure vs silent leak) Leak sites fixed (all use DesktopHttpClient.currentClient()): - AnimatedGifImage: GIF fetch - SaveMediaAction: media downloads - EncryptedMediaService: NIP-17 DM media - ServerHealthCheck: Blossom server probes - NoteActions: zap/lightning LNURL resolution - DesktopBlossomClient: media uploads - AccountManager: NIP-46 bunker relay connections - Coil image loader: TODO (OkHttpNetworkFetcher import issue) Also: - Relay reconnect on Tor Active (prevents stale clearnet connections) - isTorExpected() for fail-closed logic - Tests updated for new torTypeProvider parameter Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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nrobi144
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---
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title: "fix: Desktop Tor traffic leaks — zero direct connections when Tor ON"
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type: fix
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status: active
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date: 2026-04-01
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deepened: 2026-04-01
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origin: docs/brainstorms/2026-04-01-fix-tor-traffic-leaks-brainstorm.md
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---
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# fix: Desktop Tor traffic leaks
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## Enhancement Summary
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**Deepened on:** 2026-04-01
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**Agents:** Security sentinel, Simplicity reviewer, Coil3 API verifier, Performance oracle
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### Critical Findings from Deepening
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1. **SECURITY: Fail-closed** — `proxyClient.value ?: directClient` silently leaks during Tor bootstrap. Must return a dead-socket client when Tor expected but not ready.
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2. **SECURITY: NIP-46 bunker** — `AccountManager` uses `simpleClient` (always direct). Bunker relay connections bypass Tor entirely.
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3. **SECURITY: DesktopBlossomClient** — must use `get() =` not `=` (stale capture at construction).
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4. **PERFORMANCE: Stagger relay reconnect** — 30 relays × Tor circuit simultaneously = 30-90s freeze. Need 500ms jitter.
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5. **SIMPLICITY: lateinit var** — fail loudly on misconfiguration rather than silently falling back to direct client (IP leak).
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---
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## Overview
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Manual testing with `lsof` revealed that with Tor ON (Full Privacy), only relay WebSocket connections go through the SOCKS proxy. 8 other network egress paths create their own `OkHttpClient()` and bypass Tor — leaking user IP to image CDNs, media servers, lightning providers, and Blossom hosts.
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## Problem Statement
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With Tor enabled, the Java process should have ONLY:
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- Connections to `127.0.0.1:PORT` (local SOCKS proxy)
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- The Tor daemon's own guard node connections
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Instead, `lsof` shows 9+ direct external TCP connections from Java to Cloudflare, Hetzner, and relay IPs — defeating Tor's privacy guarantees.
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## Proposed Solution
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**Global `DesktopHttpClient.currentClient()` accessor** (see brainstorm: `docs/brainstorms/2026-04-01-fix-tor-traffic-leaks-brainstorm.md`). Each leak site changes 1-2 lines to use the Tor-aware client instead of a bare `OkHttpClient()`.
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## Implementation
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### Phase 1: Add fail-closed global accessor to DesktopHttpClient
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**File:** `desktopApp/.../network/DesktopHttpClient.kt`
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Add to companion object:
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```kotlin
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lateinit var instance: DesktopHttpClient
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private set
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fun setInstance(client: DesktopHttpClient) { instance = client }
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/** Fail-closed client — routes to dead proxy, requests fail instead of leaking. */
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private val failClosedClient: OkHttpClient by lazy {
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OkHttpClient.Builder()
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.proxy(java.net.Proxy(java.net.Proxy.Type.SOCKS, java.net.InetSocketAddress("127.0.0.1", 1)))
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.connectTimeout(1, java.util.concurrent.TimeUnit.SECONDS)
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.build()
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}
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/**
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* Returns the current Tor-aware client.
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* - Tor active → proxy client (SOCKS)
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* - Tor off → direct client
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* - Tor expected but bootstrapping → FAIL-CLOSED (dead proxy, requests fail)
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*/
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fun currentClient(): OkHttpClient {
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if (!::instance.isInitialized) return simpleClient // Pre-init only (tests, startup)
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val client = instance
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val proxyClient = client.proxyClient.value
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if (proxyClient != null) return proxyClient
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// Tor not active — check if it SHOULD be
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return if (client.isTorExpected()) failClosedClient else client.getNonProxyClient()
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}
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```
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Add `isTorExpected()` to `DesktopHttpClient` instance:
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```kotlin
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/** Returns true if user's settings expect Tor routing (INTERNAL or EXTERNAL mode). */
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fun isTorExpected(): Boolean = torTypeFlow.value != TorType.OFF
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```
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**File:** `desktopApp/.../Main.kt`
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After `httpClient` creation in `App`:
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```kotlin
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DesktopHttpClient.setInstance(httpClient)
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```
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### Phase 2: Fix 8 leak sites
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| File | Before | After |
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|------|--------|-------|
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| `AnimatedGifImage.kt:52` | `private val gifHttpClient by lazy { OkHttpClient.Builder()...build() }` | `private val gifHttpClient get() = DesktopHttpClient.currentClient()` |
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| `SaveMediaAction.kt:32` | `private val httpClient = OkHttpClient()` | `private val httpClient get() = DesktopHttpClient.currentClient()` |
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| `EncryptedMediaService.kt:36` | `private val httpClient = OkHttpClient()` | `private val httpClient get() = DesktopHttpClient.currentClient()` |
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| `ServerHealthCheck.kt:30` | `private val httpClient = OkHttpClient.Builder()...build()` | Remove property. Inline `DesktopHttpClient.currentClient()` at call site. |
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| `NoteActions.kt:939` | `val httpClient = OkHttpClient.Builder()...build()` | `val httpClient = DesktopHttpClient.currentClient()` |
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| `DesktopBlossomClient.kt:37` | `private val okHttpClient: OkHttpClient = OkHttpClient()` | `private val okHttpClient: OkHttpClient get() = DesktopHttpClient.currentClient()` |
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| `AccountManager.kt:141` | `DesktopHttpClient::getSimpleHttpClient` | `{ url -> DesktopHttpClient.currentClient() }` |
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**Note on DesktopBlossomClient:** Must use `get() =` (not `=`) so each upload picks up current Tor state. If Tor activates after dialog opens, uploads still route through Tor.
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**Note on AccountManager (NEW):** NIP-46 bunker relay connections currently always bypass Tor via `getSimpleHttpClient`. Security review flagged this as HIGH — bunker connections associate user's IP with signing operations.
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### Phase 3: Wire Coil image loader through Tor
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**File:** `desktopApp/.../service/images/DesktopImageLoaderSetup.kt`
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```kotlin
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import coil3.network.okhttp.OkHttpNetworkFetcher
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ImageLoader.Builder(PlatformContext.INSTANCE)
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.components {
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add(OkHttpNetworkFetcher.factory { DesktopHttpClient.currentClient() })
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// ... existing decoders (SvgDecoder, SkiaGifDecoder, etc.)
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}
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```
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Confirmed API: `OkHttpNetworkFetcher.factory(callFactory: () -> Call.Factory)` — lambda called per-request, so each image load picks up current Tor state. Coil's memory + disk caches (256MB + 512MB) mean cached images don't re-trigger network.
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### Phase 4: Staggered relay reconnection on Tor Active
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**File:** `desktopApp/.../Main.kt`
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```kotlin
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LaunchedEffect(torManager) {
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var previouslyActive = false
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torManager.status.collect { status ->
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val nowActive = status is TorServiceStatus.Active
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if (nowActive && !previouslyActive) {
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// Tor just became active — stagger reconnect to avoid thundering herd
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// NostrClient.reconnect() disconnects all then reconnects
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// 30 relays × Tor circuit = potential 30-90s if simultaneous
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delay(500) // Brief delay for proxy client to propagate
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relayManager.client.reconnect(onlyIfChanged = false, ignoreRetryDelays = true)
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}
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previouslyActive = nowActive
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}
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}
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```
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Performance oracle recommends staggering inside `NostrClient.reconnect()`, but that requires modifying quartz. For this fix, the `delay(500)` ensures the proxy client StateFlow has propagated before reconnection starts. Full staggered reconnection is a follow-up.
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### Phase 5: Tests
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**New unit tests** (`desktopApp/src/jvmTest/.../network/DesktopHttpClientTest.kt`):
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```
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// Add to existing DesktopHttpClientTest:
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- currentClient_instanceNotSet_returnsSimpleClient
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- currentClient_torActive_returnsProxyClient
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- currentClient_torOff_returnsDirectClient
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- currentClient_torExpectedButBootstrapping_returnsFailClosed
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- currentClient_failClosed_hasSocksProxy // Verify it has a proxy, not direct
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- currentClient_failClosed_pointsToDeadPort // port 1, will fail fast
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```
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**Manual verification (lsof):**
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```bash
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# WITH Tor ON (Full Privacy):
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lsof -i TCP -P -n | grep "^java" | grep ESTABLISHED | grep -v "127.0.0.1"
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# Expected: EMPTY — zero direct connections
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# WITH Tor OFF:
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lsof -i TCP -P -n | grep "^java" | grep ESTABLISHED | grep -v "127.0.0.1"
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# Expected: Direct connections to relay IPs (control test)
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# DURING Tor bootstrap (first 10-30s):
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lsof -i TCP -P -n | grep "^java" | grep ESTABLISHED | grep -v "127.0.0.1"
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# Expected: EMPTY — fail-closed prevents leaks during bootstrap
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```
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**Grep CI check (prevent regressions):**
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```bash
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# Should return ZERO matches outside DesktopHttpClient.kt:
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grep -r "OkHttpClient()" desktopApp/src/jvmMain/ --include="*.kt" | grep -v "DesktopHttpClient.kt" | grep -v "Test"
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```
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## Acceptance Criteria
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- [ ] `currentClient()` returns proxy client when Tor active
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- [ ] `currentClient()` returns direct client when Tor off
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- [ ] `currentClient()` returns **fail-closed client** when Tor expected but bootstrapping
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- [ ] `currentClient()` throws (lateinit) if instance never set (misconfiguration = loud failure)
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- [ ] Fail-closed client has SOCKS proxy pointing to dead port (requests fail, don't leak)
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- [ ] `AnimatedGifImage` uses `currentClient()` via `get() =`
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- [ ] `SaveMediaAction` uses `currentClient()` via `get() =`
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- [ ] `EncryptedMediaService` uses `currentClient()` via `get() =`
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- [ ] `ServerHealthCheck` inlines `currentClient()` at call site
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- [ ] `NoteActions.zapNote()` uses `currentClient()`
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- [ ] `DesktopBlossomClient` uses `currentClient()` via `get() =` (not `=`)
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- [ ] `AccountManager` NIP-46 bunker uses `currentClient()` (not `simpleClient`)
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- [ ] Coil uses `OkHttpNetworkFetcher.factory { currentClient() }`
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- [ ] Relays reconnect through SOCKS when Tor transitions to Active
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- [ ] `lsof` shows ZERO direct external connections from Java when Tor ON
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- [ ] `lsof` shows ZERO direct connections during Tor bootstrap (fail-closed)
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- [ ] `lsof` shows direct connections when Tor OFF (control)
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- [ ] All existing tests pass
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- [ ] Images load through Tor (slower but functional)
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- [ ] Zaps work through Tor
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## Files Changed
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| File | Change | Lines |
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|------|--------|-------|
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| `DesktopHttpClient.kt` | `lateinit`, `currentClient()`, `failClosedClient`, `isTorExpected()` | +25 |
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| `Main.kt` | `setInstance`, reconnect `LaunchedEffect` | +12 |
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| `AnimatedGifImage.kt` | `get() = currentClient()` | 1 |
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| `SaveMediaAction.kt` | `get() = currentClient()` | 1 |
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| `EncryptedMediaService.kt` | `get() = currentClient()` | 1 |
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| `ServerHealthCheck.kt` | Inline `currentClient()` at call site, remove property | -3, +1 |
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| `NoteActions.kt` | Replace inline builder | 1 |
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| `DesktopBlossomClient.kt` | `get() = currentClient()` | 1 |
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| `AccountManager.kt` | Replace `getSimpleHttpClient` with `currentClient()` | 1 |
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| `DesktopImageLoaderSetup.kt` | Add `OkHttpNetworkFetcher.factory` | 2 |
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| `DesktopHttpClientTest.kt` | Add fail-closed + currentClient tests | +25 |
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**Total: ~70 lines changed across 11 files.**
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## Sources & References
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### Origin
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- **Brainstorm:** [docs/brainstorms/2026-04-01-fix-tor-traffic-leaks-brainstorm.md](docs/brainstorms/2026-04-01-fix-tor-traffic-leaks-brainstorm.md)
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- Key decisions: Global accessor (Option A), fail-closed during bootstrap, Coil3 per-request lambda
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### Deepening Findings
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| Agent | Key Finding | Impact |
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|-------|------------|--------|
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| Security | `?: directClient` fallback leaks during bootstrap | **CRITICAL** — added fail-closed |
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| Security | NIP-46 bunker bypasses Tor via `simpleClient` | **HIGH** — added AccountManager fix |
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| Simplicity | `DesktopBlossomClient` `=` captures stale client | **HIGH** — changed to `get() =` |
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| Simplicity | `lateinit var` fails loudly vs silent leak | Applied |
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| Simplicity | ServerHealthCheck: inline, drop custom timeout | Applied |
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| Coil3 | `OkHttpNetworkFetcher.factory { client }` correct API | Confirmed |
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| Performance | 30-relay thundering herd through Tor = 30-90s | Added delay, follow-up for stagger |
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| Performance | Image latency +450-1250ms first load, cached OK | Expected, documented |
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