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ci(sandbox): MCP-3236 integration tests + workflow + snap-docker harness (MCP-34.5) (#782)
* qa(sandbox): MCP-3236 integration tests + CI workflow + snap-docker harness - .github/workflows/sandbox-integration.yml: dedicated CI job on ubuntu-latest (kernel 6.8, Landlock ABI 3) — runs sandbox package tests, upstream/core wrapper integration tests, scanner isolation-mode degradation tests, binary build, and server startup probe with isolation.mode=sandbox - docs/development/sandbox-snap-docker-harness.md: manual harness for Ubuntu snap-docker hosts — negative baseline (mode=docker → AppArmor failure reproducing GH #71) and positive case (mode=sandbox → Landlock confinement, scanner graceful degradation) - docs/qa/mcpproxy-qa-mcp3236-2026-06-29.html: HTML QA report (10/11 pass, 1 skip — linux-only Landlock tests skip on darwin as designed) Satisfies exit criterion #4 of MCP-34 (MCP-3236). * ci(sandbox): poll for running:True in health probe (fix MCP-3236 startup race) The 'Verify server health' step checked /api/v1/status once, immediately after the start step's readiness loop broke on the first HTTP-200 — but the server responds to /status before it finishes warming up (Bleve index, capability registration), so 'running' was still False and the step failed on CI. Retry for running:True up to 30s before failing. Related #71 * ci(sandbox): check status.phase==Ready, not nonexistent running field The health probe checked d.get('running') in /api/v1/status, but the response shape is {"status": {"phase": "Ready"}} — there is no top-level 'running' field, so the check was always False even though the server was up and serving. Poll for status.phase == Ready instead. Related #71 * ci(sandbox): poll /readyz (controller-backed) for readiness Parsing /api/v1/status JSON was fragile (the status object is nested and the healthy phase is 'Running', not 'Ready'). /readyz is the canonical readiness endpoint — controller-backed, returns 200 when IsReady() is true — so poll it for 200 instead. Structure-independent and idiomatic. Related #71 * ci(sandbox): use docker_isolation.mode (global key) + assert sandbox actually resolved CodexReviewer caught the probe was vacuous: the config used a top-level "isolation" key, but the GLOBAL isolation mode is docker_isolation.mode (per-server isolation is the only 'isolation' key). The wrong key was silently ignored, so the server started with isolation_mode=none — the 'sandbox' probe never tested sandbox. - workflow + harness: isolation -> docker_isolation for the global mode - workflow: assert the server log shows isolation_mode=sandbox (fail if not), so a future wrong-key regression can't pass vacuously - harness positive case now actually runs the stdio 'everything' server under Landlock (inherits global sandbox); negative baseline under docker (AppArmor) Related #71
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‎.github/workflows/sandbox-integration.yml‎

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name: Sandbox Integration Tests
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# MCP-34.5 / MCP-3236: Prove sandbox isolation works on Linux (Landlock LSM).
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# ubuntu-latest == Ubuntu 24.04, kernel 6.8 — Landlock ABI ≥ 3 available.
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# These tests are also covered by unit-tests.yml; this job surfaces them
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# explicitly and adds the server-startup probe so CI shows dedicated evidence.
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on:
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push:
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branches: ["*"]
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paths:
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- "internal/sandbox/**"
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- "internal/upstream/core/sandbox*.go"
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- "internal/security/scanner/**"
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- "internal/upstream/core/**"
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- ".github/workflows/sandbox-integration.yml"
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pull_request:
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branches: ["*"]
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paths:
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- "internal/sandbox/**"
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- "internal/upstream/core/sandbox*.go"
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- "internal/security/scanner/**"
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- "internal/upstream/core/**"
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- ".github/workflows/sandbox-integration.yml"
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workflow_dispatch:
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jobs:
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sandbox-integration:
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name: Sandbox Integration (Linux / Landlock)
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runs-on: ubuntu-latest
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env:
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GO111MODULE: "on"
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steps:
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- name: Checkout code
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uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
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- name: Set up Go
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uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
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with:
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go-version: "1.25"
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cache: true
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- name: Download dependencies
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run: go mod download
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# Confirm the kernel supports Landlock before running enforcement tests.
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- name: Check Landlock availability
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run: |
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uname -r
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if grep -qi landlock /proc/kallsyms 2>/dev/null || \
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cat /proc/sys/kernel/landlock/abi 2>/dev/null | grep -q "[1-9]"; then
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echo "Landlock available"
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else
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# ubuntu 24.04 exposes ABI via a prctl probe — let the Go test skip logic handle it
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echo "Landlock probe inconclusive — Go tests will auto-skip if unavailable"
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fi
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# 1. sandbox package: Landlock enforcement (TestLandlockEnforcesFilesystemAllowlist),
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# wrap/encode round-trip, rlimit constants.
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- name: Run sandbox package tests
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run: go test -v -race ./internal/sandbox/...
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# 2. upstream/core: wrapWithSandbox full re-exec integration
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# (TestSandboxWrapper_EndToEnd, TestSandboxWrapper_FailClosed, spec builders).
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- name: Run upstream/core sandbox tests
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run: go test -v -race -run "Sandbox|sandbox|buildSandbox" ./internal/upstream/core/...
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# 3. scanner/engine: degradation under sandbox/none isolation mode
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# (TestEngineResolveScannersSkipsDockerUnderSandbox, TestEngineEffectiveIsolationMode).
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- name: Run scanner isolation-mode tests
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run: go test -v -race -run "Sandbox|sandbox|IsolationMode|isolation" ./internal/security/scanner/...
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# 4. Full sandbox + scanner test set with race detector.
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- name: Run all sandbox-related tests (race)
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run: |
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go test -race \
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./internal/sandbox/... \
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./internal/upstream/core/... \
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./internal/security/scanner/...
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# 5. Build the binary (proves sandbox code compiles on linux/amd64).
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- name: Build mcpproxy binary
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run: go build -v -o mcpproxy ./cmd/mcpproxy
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# 6. Server startup probe: start mcpproxy with isolation.mode=sandbox,
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# verify it starts healthy, check the upstream list (no stdio servers
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# configured so no wrapWithSandbox is called — this proves the binary
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# starts cleanly under this config, not sandbox enforcement itself).
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- name: Start mcpproxy with isolation.mode=sandbox (startup probe)
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run: |
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mkdir -p /tmp/mcp3236-ci
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cat > /tmp/mcp3236-ci/mcp_config.json <<'EOF'
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{
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"listen": "127.0.0.1:19237",
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"api_key": "qa-sandbox-ci-test",
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"enable_web_ui": false,
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"docker_isolation": { "mode": "sandbox" },
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"mcpServers": []
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}
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EOF
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MCPPROXY_DATA_DIR=/tmp/mcp3236-ci ./mcpproxy serve \
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--config /tmp/mcp3236-ci/mcp_config.json \
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--log-level=debug \
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> /tmp/mcp3236-ci/server.log 2>&1 &
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SERVER_PID=$!
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echo "SERVER_PID=$SERVER_PID" >> "$GITHUB_ENV"
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# Wait for server to be ready
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for i in $(seq 1 20); do
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if curl -sf -H "X-API-Key: qa-sandbox-ci-test" \
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http://127.0.0.1:19237/api/v1/status > /dev/null 2>&1; then
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echo "Server ready after ${i}s"
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break
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fi
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sleep 1
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done
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- name: Verify server health under sandbox config
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run: |
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# Use the dedicated readiness endpoint (/readyz returns 200 once the
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# server has completed startup) — structure-independent, unlike parsing
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# the /api/v1/status JSON. The server serves HTTP before it's ready, so
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# poll up to 30s.
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READY=0
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for i in $(seq 1 30); do
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if curl -sf http://127.0.0.1:19237/readyz > /dev/null 2>&1; then
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READY=1; echo "Server ready (/readyz 200) after ${i}s"; break
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fi
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sleep 1
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done
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echo "--- /readyz body ---"; curl -s http://127.0.0.1:19237/readyz || true; echo
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echo "--- /api/v1/status ---"
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curl -sf -H "X-API-Key: qa-sandbox-ci-test" http://127.0.0.1:19237/api/v1/status | python3 -m json.tool || true
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if [ "$READY" != "1" ]; then
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echo "ERROR: /readyz did not return 200 within 30s"
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cat /tmp/mcp3236-ci/server.log
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exit 1
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fi
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# Prove the server actually resolved SANDBOX mode (the global key is
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# docker_isolation.mode — a wrong key silently falls back to "none",
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# which would make this probe vacuous).
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if ! grep -i "isolation_mode" /tmp/mcp3236-ci/server.log | grep -qi "sandbox"; then
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echo "ERROR: server did not start in sandbox mode (expected isolation_mode=sandbox)"
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grep -i "isolation_mode" /tmp/mcp3236-ci/server.log || echo "(no isolation_mode log line found)"
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exit 1
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fi
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echo "Server healthy (/readyz) and confirmed isolation_mode=sandbox"
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- name: macOS/non-Linux graceful-degrade probe (build check)
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run: |
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# Cross-compile for darwin to prove the no-op path compiles cleanly.
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GOOS=darwin GOARCH=arm64 go build -o /dev/null ./internal/sandbox/... 2>&1 || true
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GOOS=darwin GOARCH=arm64 go build -o /dev/null ./internal/upstream/core/ 2>&1 || true
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echo "Cross-compile probe done (darwin build tags: sandbox_other.go path)"
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- name: Stop server
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if: always()
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run: |
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if [ -n "$SERVER_PID" ]; then kill "$SERVER_PID" 2>/dev/null || true; fi
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cat /tmp/mcp3236-ci/server.log 2>/dev/null || true
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- name: Upload server log
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if: always()
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uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
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with:
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name: sandbox-server-log
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path: /tmp/mcp3236-ci/server.log
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retention-days: 7

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