feat!: run container images as a non-root user - #29
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Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review. WalkthroughThe release container now runs as UID/GID 1000 with ChangesNon-root container runtime and image validation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to Container end-to-end coverage now handles asynchronous startup failures while continuing to validate non-root runtime behavior, migration, privileged ports, and capability requirements. No current merge-blocking risk is identified. Sequence Diagram(s)sequenceDiagram
participant Testcontainers
participant ProxyContainer
participant BackendContainer
participant DockerBuildx
Testcontainers->>DockerBuildx: Build Dockerfile.release and backend fixture
DockerBuildx->>ProxyContainer: Create release image
Testcontainers->>ProxyContainer: Start with UID and capability settings
ProxyContainer->>BackendContainer: Wake backend and forward HTTP/TCP traffic
BackendContainer->>ProxyContainer: Accept authenticated SSH shutdown
Testcontainers->>ProxyContainer: Validate migration, lifecycle, and exit status
🚥 Pre-merge checks | ✅ 4 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (4 passed)
Full details: Out of Scope Changes checkExplanation Most changes support issue ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In @.github/workflows/test.yml:
- Around line 58-59: Update both actions/checkout steps in the workflow to set
persist-credentials to false, ensuring checkout does not store the GITHUB_TOKEN
in .git/config before pull-request code runs.
In `@README.md`:
- Around line 93-94: Update the README override example near the “your own IDs”
guidance to use the host user’s actual UID and GID, either via explicit
placeholders or by clearly labeling 1001:1001 as an example and directing
readers to substitute the values from id -u and id -g.
- Around line 342-352: Update the container setup instructions near the volume
example to prepare ./conf with ownership or permissions writable by UID/GID
1000:1000, using an equivalent mkdir and chown step before starting the sidecar.
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Inline comments:
In `@main.go`:
- Around line 1752-1753: Update warnUnreadableSSHKeys so the path-to-open race
cannot block startup: open path with non-blocking semantics, then validate the
opened descriptor’s file type before reading it. Preserve the existing handling
for regular files and error paths while ensuring a FIFO replacement after the
initial stat is rejected safely.
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Inline comments:
In @.github/workflows/test.yml:
- Around line 57-58: Update the image job around the arm64 build to restore a
runtime smoke test for the release image, using arm64 QEMU or an equivalent
runtime check. Start the built image and validate the non-root UID 1000
execution, the /app/config.toml entrypoint, and CAP_NET_BIND_SERVICE before
release validation proceeds.
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Inline comments:
In `@e2e/container_test.go`:
- Around line 132-134: Update the capability test’s container host configuration
in the tc.Run call to set net.ipv4.ip_unprivileged_port_start to 1024, matching
the proxyOptions setup, while preserving the existing CapDrop behavior so port
443 requires the intended file capability.
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Closes #27.
Published images previously ran the proxy as root. The image now runs as the dedicated
doormouseaccount with numeric UID/GID1000:1000, while retaining privileged HTTP and TCP port support through the binary’sCAP_NET_BIND_SERVICEfile capability.The binary lives at
/usr/local/bin/doormouse, allowing/appto be mounted as a writable configuration directory. Legacy configurations produce a0600migrated copy beside the original when permissions allow it; otherwise the complete translation is logged. The README documents directory preparation, host UID/GID overrides, SSH-key ownership, and capability requirements, including the limitation of file capabilities underno-new-privileges.SSH keys are checked at startup so unreadable mounts are reported before the first idle shutdown. The check opens non-blockingly and validates the opened descriptor, preventing directories or FIFOs (including concurrent path replacements) from blocking startup, and skips unused keys when shutdown uses HTTP. These warnings do not prevent the proxy from starting.
Local builds use
bash scripts/build-container.sh doormouse:local, which compiles from source and packages the binary withDockerfile.release. This replaces the separate source Dockerfile while keeping one runtime definition for local and published images. GoReleaser remains the release build path. QEMU enables arm64 image build steps in both CI and releases.Validation:
go test -race -shuffle=on ./...,go vet ./..., and staticcheck pass locally.e2eGo module uses Testcontainers and buildsDockerfile.releaseonce. Five proxy runs cover three scenarios: runtime lifecycle under default UID 1000 and overridden UID 1001; writable-directory migration and read-only-file fallback with an unreadable key; and startup rejection whenNET_BIND_SERVICEis dropped. The runtime cases verify real WOL packets, HTTP forwarding on 443, raw TCP forwarding on 993 including half-close, authenticated SSH idle shutdown using a mounted0600key, and clean SIGTERM exit. The backend fixture models power state while using real protocol sockets. CI runs this suite alongside the arm64 image build.This remains a breaking change for deployments whose mounts are unreadable by the new runtime UID or whose capability settings prevent execution. The README includes upgrade guidance for images after 1.0.0.
Summary by CodeRabbit
New Features
Documentation
Testing