wuyang
74 lines
3.1 KiB
Markdown
74 lines
3.1 KiB
Markdown
# Security model
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## Trust boundaries
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Only Open WebUI is public. Runtime, Gateway, PostgreSQL, and Redis are on an
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internal Compose network.
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Open WebUI forwards a short-lived HS256 user JWT. Runtime and Gateway verify
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the signature, issuer, expiry, and subject. They also require independent
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service bearer keys, so a copied user identity token alone cannot call either
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service.
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The browser never receives:
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- the upstream provider URL or API key;
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- provider model IDs;
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- the Workspace Gateway service key;
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- the user identity signing key;
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- Docker, SSH, MCP/OpenAPI, prompt, or experiment configuration.
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## Workspace isolation
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Each user gets a dedicated container and named volume derived from a
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SHA-256 hash of the immutable Open WebUI user ID. Containers:
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- run as UID/GID 1000;
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- have a read-only root filesystem and writable `/workspace` volume;
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- use a dedicated per-user bridge network when egress is enabled;
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- drop every Linux capability;
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- enable `no-new-privileges`;
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- receive memory, CPU, and PID limits;
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- do not receive the Docker socket;
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- expose no ports to the host.
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Only Workspace Gateway receives the Docker socket in local mode. Runtime and
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Open WebUI never receive it. Remote mode removes the socket mount, mounts the
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chosen SSH configuration read-only, and moves Docker access to an SSH-connected
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execution host.
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Workspace paths are normalized and rejected if they escape `/workspace`.
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File browsing and downloads use the same identity boundary. Single-file
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downloads are bounded to 128 MiB by default; directory archives are streamed.
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## Deployment secrets
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Secrets live only in a mode-600 deployment `.env` outside Git. Images contain
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no provider or infrastructure credentials. Provider credentials are never
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returned to the browser, logged by application code, or committed to Git.
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The Web image is rebuilt from a commit-pinned Open WebUI release on
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digest-pinned Node and Python bases. RAG/vector, cloud storage, media model,
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browser automation, and unused cryptographic dependencies are excluded.
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Release acceptance audits both the repository environment and the finished Web
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image. `scripts/audit-web-image.sh` requires:
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- `pip check` to report a consistent Python environment;
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- `pip-audit` to report zero known Python vulnerabilities, with no ignored IDs;
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- Trivy to report zero fixable High/Critical OS or library vulnerabilities.
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`scripts/audit-images.sh` applies the fixable High/Critical gate to Web,
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Runtime, Gateway, and the user Workspace image. As of 2026-07-26 all four pass.
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Trivy also reports 38 High/Critical Debian findings in the Web image for which
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the distribution publishes no fix; the release gate records these separately
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through `--ignore-unfixed` rather than pretending an application change can
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remediate them.
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## Remaining hardening before hostile public use
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Workspaces run on a dedicated physical Docker host, separated from the public
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web and database services. The Docker daemon remains a high-value boundary.
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Before treating the service as hostile multi-tenant infrastructure, add
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per-workspace egress policy, image signing, central audit retention,
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backup/restore drills, quotas, and resource-abuse alerts.
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