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216 lines
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216 lines
19 KiB
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<title>ADR-0004 — High-risk lanes refuse raw value streaming to agent sessions</title>
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<div class="wrap"><header><div class="eyebrow"><span>ops-warden-adr-0004</span> <span class="stat">accepted · 1</span> <span>ops-warden</span> <span>reviewed 2026-08-18</span><span>generated from canonical source — do not edit</span></div><h1>ADR-0004 — High-risk lanes refuse raw value streaming to agent sessions</h1><p class="sub">Source: <code>ops-warden · docs/adr/ADR-0004-agent-read-boundary-on-high-risk-lanes.md · 8afcc9c32170d76f6d5d02ea153967ed5c6fc4d5</code></p><p class="sub">Review due: 2027-02-18</p></header><div class="layout"><nav class="rail" aria-label="Sections"><ol><li><a href="#status"><span class="n">·</span>Status</a></li><li><a href="#context"><span class="n">·</span>Context</a></li><li><a href="#decision"><span class="n">·</span>Decision</a></li><li><a href="#consequences"><span class="n">·</span>Consequences</a></li><li><a href="#related"><span class="n">·</span>Related</a></li></ol></nav><main><section id="status"><h2>Status</h2>
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<p>Accepted. Decided during WARDEN-WP-0026 (credential disclosure hygiene), in response to a real disclosure on 2026-07-16.</p>
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</section>
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<section id="context"><h2>Context</h2>
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<p>On 2026-07-16 a secret value reached a captured stdout. The mechanism was ordinary: <code>bao kv get -field=X</code> in an agent session. Nothing was misconfigured and nobody misused a tool. The value was read correctly, by an authorized caller, using the documented command — and an agent session records its stdout, so the value landed in a transcript that outlives the shell.</p>
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<p>This is a structural mismatch, not a mistake to train away. Agent sessions are logged by design; that is what makes them reviewable. A human at a terminal sees a value and it scrolls away. An agent "seeing" a value writes it into a durable context that may be stored, replayed, or sent to an inference provider.</p>
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<p>Guidance alone will not fix it. The command is correct, it is in every runbook, and the next agent that needs the value will reach for it.</p>
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</section>
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<section id="decision"><h2>Decision</h2>
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<p><strong>When <code>WARDEN_AGENT_ID</code> is set and the catalog lane is <code>risk: high</code>, ops-warden refuses to stream the raw value and exits 7.</strong> The agent is not blocked from doing its work — <code>--out</code>, <code>--exec</code>, <code>--wrap</code> and <code>--fingerprint</code> all remain available. It is blocked from doing its work <em>in a way that writes the secret into a transcript</em>.</p>
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<p><strong>The boundary is enforced at the credential store as well as at the CLI.</strong> The OpenBao policy <code>agent-high-risk-boundary</code> denies data-read on those paths for agent tokens, allowing metadata and capabilities only. A control that lives solely in our own CLI is a control that ends the moment someone calls <code>bao</code> directly.</p>
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<p><strong>Verification must not require a read.</strong> To check a lane, use <code>bao token capabilities</code> — allow/deny — never a read of the value. This is the specific habit the disclosure taught us to break.</p>
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<p><strong>Exposure is reportable without reading.</strong> <code>warden taint <catalog-id></code> reports KV v2 <code>custom_metadata</code> (<code>exposed_at</code>, <code>exposed_version</code>) and touches no secret data.</p>
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</section>
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<section id="consequences"><h2>Consequences</h2>
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<p><strong>Agents can still do everything they could before, by a different route.</strong> <code>--exec</code> covers nearly every real case: the child process gets the value in its environment, the agent never sees it. The friction is deliberate and small.</p>
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<p><strong>Exit 7 is a contract other runtimes depend on.</strong> It is a distinguishable code, not a generic failure, so a caller can tell "refused by boundary" from "lane broken" and retry correctly. Changing it is a breaking change to every agent runtime.</p>
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<p><strong><code>risk: high</code> becomes a load-bearing catalog field</strong> rather than documentation. Classifying a lane now changes runtime behaviour, so it must be set deliberately.</p>
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<p><strong>We accept that <code>--unsafe-stdout</code> still exists for humans.</strong> The boundary keys on <code>WARDEN_AGENT_ID</code>, so an agent that does not set it is not caught. That is a known limit: this ADR raises the floor for cooperating runtimes and hardens the store behind them; it does not claim to stop a determined caller.</p>
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</section>
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<section id="related"><h2>Related</h2>
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<ul><li><code>wiki/playbooks/agent-read-boundary.md</code></li><li><code>wiki/playbooks/exposed-taint.md</code></li><li><code>ADR-0002</code> — the conduit rule this narrows for agent callers</li></ul>
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</section><footer><span>ops-warden-adr-0004 · 1 · accepted</span><span>ops-warden · docs/adr/ADR-0004-agent-read-boundary-on-high-risk-lanes.md · 8afcc9c32170d76f6d5d02ea153967ed5c6fc4d5</span></footer></main></div></div></html>
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