ci: use tag-scoped native Blacksmith Testbox - #10135
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📝 WalkthroughWalkthroughThe PR adds a manually dispatched Blacksmith Testbox broker workflow. It validates trusted identity before and after token exposure, isolates broker state and reviewed source, maintains Testbox status, configures a Linux runner label, and adds CI security tests. ChangesTestbox broker workflow
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟠 High · up to The workflow changes how Testbox tokens and heartbeat processes are isolated, but unresolved failure-path behavior can prevent cleanup or keepalive startup, and descendant processes may retain access to a bearer token after state movement; protected commit identifiers may also appear in logs. These risks should be fixed or explicitly accepted before merging. Sequence Diagram(s)sequenceDiagram
participant Dispatcher
participant GitHubActions
participant validate_identity
participant BeginTestbox
participant isolate_state
participant CandidateCheckout
participant keepalive
Dispatcher->>GitHubActions: dispatch with testbox_id and optional source_sha
GitHubActions->>validate_identity: validate trusted broker and source identity
GitHubActions->>BeginTestbox: start Testbox session
GitHubActions->>validate_identity: validate post-Testbox state
GitHubActions->>isolate_state: move broker state to root storage
GitHubActions->>CandidateCheckout: checkout reviewed source in isolation
GitHubActions->>keepalive: report status and monitor activity
Possibly related PRs
Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning, 1 inconclusive)
✅ Passed checks (22 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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| --arg testbox_id "$testbox_id" \ | ||
| --arg runner_host "$runner_host" \ | ||
| --arg runner_ssh_port "$runner_ssh_port" \ | ||
| --arg working_directory "$working_directory" \ |
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The Begin Testbox action runs while the checkout is still the trusted broker root, validate-identity.sh requires the resulting working_directory to equal that root, and this payload publishes the same directory when marking the Testbox ready. Consequently an adopter is directed to the broker commit rather than the reviewed code checked out later under candidate-source, so the intended candidate tests cannot run from their expected repository root. After verifying the isolated checkout, publish its canonical path as the Testbox working directory while keeping broker scripts rooted in the trusted checkout.
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| testbox_id="$(read_state testbox_id)" | ||
| installation_model_id="$(read_state installation_model_id)" | ||
| auth_token="$(read_state auth_token)" |
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When an adopter connects using the Testbox runner account, the candidate shell can read /tmp/.testbox/auth_token: mode 0700 only excludes other Unix users, while the keepalive leaves this bearer-token file in place for the entire ready session. Candidate code can therefore exfiltrate the token or forge ready, completed, or hydration_failed phone-home requests, defeating the new broker trust boundary; keep the token under a separate OS identity or otherwise make it inaccessible to the adopted session.
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Actionable comments posted: 7
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Inline comments:
In `@scripts/blacksmith-testbox-broker/keepalive.sh`:
- Around line 12-53: Extract the shared state setup, read_state function, and
field validations from keepalive.sh and validate-identity.sh into
scripts/blacksmith-testbox-broker/lib-state.sh, then source that library from
both scripts. Preserve the existing trust checks and validation behavior
exactly, including die handling and shared state variables, so both helpers use
one identical implementation.
- Around line 77-89: Remove the hand-rolled retry loop and fixed sleep from
phone_home_with_retry, reducing it to a single phone_home call. Move bounded
retry behavior into the curl invocation used by phone_home, using curl’s retry
options including --retry-max-time, while preserving the existing status
argument and success/failure return behavior.
- Around line 117-118: Replace the text-based port match in the keepalive check
with an ss structured filter that selects sockets by the local SSH port, while
preserving the existing established TCP check and last_activity update behavior.
- Around line 70-74: Update the phone-home curl invocation in the keepalive
script to prevent the bearer token from appearing in process arguments: pass the
Authorization header via curl’s stdin using -H `@-` and provide the request
payload separately, or use a 0600 temporary --config file when curl is older
than 7.55.0. Preserve the existing endpoint, timeout, and failure behavior.
In `@scripts/blacksmith-testbox-broker/validate-identity.sh`:
- Around line 73-82: Update both git ls-remote invocations in validate-identity
to enforce low-speed limits and fail stalled network connections quickly, while
preserving the existing command substitution and die error paths for either
remote SHA lookup.
In `@tests/test_testbox_workflow_security.py`:
- Around line 65-69: Update the step method’s missing-step path to add an
explicit unreachable raise after self.fail, preserving the existing failure
behavior while satisfying RET503 and the dict[str, Any] return annotation.
- Around line 46-49: In workflow_document, add a narrowly scoped S506
suppression on the yaml.load call using yaml.BaseLoader, including a reason that
this loader produces only scalar strings and container values. Preserve
BaseLoader rather than switching to safe_load, since the tests rely on
string-valued YAML scalars.
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| shell: bash | ||
| run: | | ||
| set -euo pipefail | ||
| sudo -n true |
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When an adopter connects as the runner account, this preflight explicitly depends on that account retaining passwordless root access, and no later step revokes it before publishing ready. Root-owning the state therefore does not establish a trust boundary: candidate code can use sudo to inspect the root keepalive process or instrument the curl invocation and capture its bearer token on a later phone-home request. Fresh evidence beyond the prior token-file comment is that the revised flow now explicitly verifies and relies on the privilege that bypasses the new root-only storage; run the broker under a separate identity that the adopted account cannot sudo to.
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| fi | ||
| done | ||
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| phone_home_with_retry completed || die "broker lifetime deadline expired" |
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When a session remains active for the full 6,900-second lifetime, the loop exits only after now >= deadline, but phone_home() immediately calls remaining_seconds(), which rejects that same condition. The completed request therefore can never be sent on this path, leaving the Testbox published as ready and failing the broker job instead of releasing the reservation; exit the loop early enough to retain a bounded cleanup window or allow this final request its own timeout.
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Actionable comments posted: 2
Caution
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⚠️ Outside diff range comments (1)
.github/workflows/ci-workflow-guard-tests-testbox-broker.yml (1)
137-140: 🔒 Security & Privacy | 🟡 Minor | ⚡ Quick winDo not write protected SHAs to workflow logs.
Line 139 writes both the candidate SHA and protected reviewed SHA to an
::error::annotation. These are internal identifiers. Emit an invariant-only error message.Proposed fix
- echo "::error::candidate checkout SHA $candidate_sha does not equal reviewed_sha $REVIEWED_SHA" >&2 + echo "::error::candidate checkout does not match the protected revision" >&2As per coding guidelines: “User-facing errors, alerts, command output, API bodies, and recovery copy must not expose vendor/provider internals, flags, templates, identifiers, credentials, tokens, headers, private keys, session IDs, raw upstream messages, or unredacted payloads.”
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Inline comments:
In `@scripts/blacksmith-testbox-broker/isolate-state.sh`:
- Around line 81-83: The heartbeat validation and cleanup in the isolate-state
script must use an authoritative immutable process-instance identity rather than
matching reused-PID command arguments. Record the identity when launching the
heartbeat, compare it before termination, fail closed on mismatch or failed kill
operations, and track the entire heartbeat process group or descendant tree
until every process has exited before moving /tmp/.testbox.
Apply the same fix in `@scripts/blacksmith-testbox-broker/isolate-state.sh` around
lines 88 - 105.
In `@scripts/blacksmith-testbox-broker/keepalive.sh`:
- Around line 195-210: Replace the fixed tail-based polling in the keepalive
wait loop with an event-driven notification owned by the trusted activity owner,
emitted whenever SSH lifecycle state or the activity marker changes. Block on
that event while preserving the existing absolute deadline and cancellation
handling for idle/lifetime limits, and retain socket rescanning only after a
notification or timeout rather than on a fixed 30-second interval.
---
Outside diff comments:
In @.github/workflows/ci-workflow-guard-tests-testbox-broker.yml:
- Around line 137-140: Update the SHA mismatch error in the candidate checkout
validation to emit only an invariant-level message, removing both candidate_sha
and REVIEWED_SHA from the ::error:: annotation while preserving the existing
failure exit behavior.
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.github/workflows/ci-workflow-guard-tests-testbox-broker.ymlscripts/blacksmith-testbox-broker/isolate-state.shscripts/blacksmith-testbox-broker/keepalive.shscripts/blacksmith-testbox-broker/lib-state.shscripts/blacksmith-testbox-broker/validate-identity.shtests/test_testbox_workflow_security.py
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Inline comments:
In `@scripts/blacksmith-testbox-broker/keepalive.sh`:
- Line 185: Update the cancellation cleanup message in the keepalive script to
use provider-neutral wording, replacing the service-specific “Testbox”
terminology while preserving stderr output and the existing cleanup behavior.
- Around line 132-139: Ensure the initialization path defines phone_home and
phone_home_with_retry before installing the SIGINT/SIGTERM cancellation trap, so
cancel always reports hydration_failed; add a regression test covering
cancellation during initialization and preserve the existing cleanup_sent guard.
In `@tests/test_testbox_workflow_security.py`:
- Around line 341-345: Update the assertRegex call for keepalive so the
case-insensitive and DOTALL flags are applied to the regular expression via
inline flags or a compiled pattern, rather than passed as the third message
argument.
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scripts/blacksmith-testbox-broker/keepalive.shtests/test_testbox_workflow_security.py
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| broker_pgid="$(proc_group_id "$$")" || die "broker process group is unavailable" | ||
| [[ "$heartbeat_pgid" != "$broker_pgid" ]] || die "Begin heartbeat shares the broker process group" |
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With the pinned action behavior documented above (nohup bash -c followed by disowning, without setsid), the heartbeat does not get a new process group: it inherits the runner's group, as does this subsequent shell step on the Blacksmith Actions runner. Consequently heartbeat_pgid equals broker_pgid, this check fails, and every otherwise-successful broker run stops before isolating state or publishing the candidate. The heartbeat must be started or re-parented under a genuinely separate trusted supervisor rather than relying on nohup/disown to create a process group.
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| # Stop the group and each recorded descendant. A bounded wait and a final | ||
| # kill prevent an in-flight child from retaining the bearer token. | ||
| kill -- "-$heartbeat_pgid" 2>/dev/null || { |
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When this termination succeeds, the broker permanently stops the only process that posts to /api/testbox/heartbeat; the root-owned keepalive.sh only calls /api/testbox/phone-home. A slow candidate checkout or any ready session lasting beyond the service's heartbeat grace period can therefore be reclaimed even though the broker is still monitoring it. Reimplement the heartbeat inside the root-owned broker and stop it only when a terminal status is reported.
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Actionable comments posted: 2
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Inline comments:
In `@scripts/blacksmith-testbox-broker/isolate-state.sh`:
- Around line 199-216: Update the heartbeat cleanup flow after the descendant
SIGKILL loop to wait for every recorded heartbeat descendant using the same
bounded timeout and tail --pid mechanism as heartbeat_pid, then fail closed if
any descendant remains alive. Ensure descendants that changed process groups are
still verified through heartbeat_descendants, while preserving the existing
heartbeat process-group validation.
- Around line 168-189: Update the heartbeat revalidation checks around
proc_start_time and proc_group_id to accept processes whose /proc entries have
disappeared, treating them as already terminated. For still-live heartbeat and
descendant PIDs, continue requiring matching birth times and process groups,
failing closed on any mismatch; preserve the existing kill behavior in the
termination flow.
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| max_lifetime_seconds=6900 | ||
| final_report_reserve_seconds=60 |
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When the two full-history checkouts, remote validations, Begin action, and state isolation take more than five minutes, this 6,900-second lifetime extends past the workflow's absolute timeout-minutes: 120 limit. The runner can therefore terminate the keepalive before its final completed callback, leaving a published Testbox reservation unreleased. Fresh evidence beyond the earlier lifetime finding is that the 60-second reserve only protects this script's own deadline and does not account for time spent in the preceding workflow steps; derive the deadline from the job start or leave a larger bounded workflow-level cleanup margin.
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| return "\n".join(line.split(" #", 1)[0] for line in text.splitlines()) | ||
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| class TestboxBrokerSecurityTests(unittest.TestCase): |
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This commit introduces the broker implementation and its regression suite together, so CI never observes the required intermediate state where the new security tests fail against the old behavior. Split the tests into the first commit and the implementation into the second so the PR history demonstrates that the coverage actually catches the regression.
AGENTS.md reference: AGENTS.md:L71-L73
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| heartbeat_deadline_path="$state_dir/broker_heartbeat_deadline" | ||
| heartbeat_deadline_mode="$(broker_stat_mode "$heartbeat_deadline_path")" \ | ||
| || die "could not inspect heartbeat deadline" |
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When the postflight validation fails after Begin Testbox, the isolation step can still succeed, but Start trusted provider heartbeat is skipped because it uses if: success(). The always-running keepalive then reaches this mandatory broker_heartbeat_deadline lookup before inspecting JOB_STATUS, fails because the marker was never created, and never sends the intended hydration_failed callback, leaving the Testbox reservation unreleased. Handle failure/cancellation before requiring heartbeat state, or initialize the cleanup deadline independently of the success-only heartbeat step.
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| - name: Run trusted broker keepalive | ||
| if: always() |
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When the workflow is cancelled after this final step has started, GitHub re-evaluates the running step's condition and always() remains true, so the runner leaves it executing; meanwhile JOB_STATUS was already expanded as success, so neither the cancelled branch nor the signal trap runs. The keepalive's ten-minute idle timeout exceeds GitHub's forced-cancellation window, causing the process to be terminated without sending hydration_failed and potentially leaving the published Testbox reserved. Use a cancellation-aware supervisor or condition that still permits cleanup to start but does not make the long-running step cancellation-resistant.
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| state_testbox_id="$(read_state testbox_id)" | ||
| state_run_id="$(read_state adopted_run_id)" | ||
| state_working_directory="$(read_state working_directory)" | ||
| heartbeat_pid="$(read_state heartbeat_pid)" |
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When Begin Testbox fails or is cancelled after writing the token-bearing state but before recording heartbeat_pid, this mandatory read aborts isolation before the state is moved or the token is removed. The workflow then has no state_dir output, so the keepalive also exits before reporting failure, leaving /tmp/.testbox runner-readable and the provider reservation unreleased. Add a partial-state cleanup path that safely removes/reports state even when the Begin heartbeat marker or other late fields were never created.
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| wait_for_provider_heartbeat_ready || die "trusted provider heartbeat is unavailable" | ||
| remove_token | ||
| phone_home_with_retry ready || die "could not report Testbox ready state" |
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When the provider accepts the ready request but curl still returns an error—for example, because its response is lost after the server commits the status—this branch calls die, and the EXIT trap only stops the heartbeat and deletes local state. No completed or hydration_failed callback is attempted even though auth_token remains available in memory, so the Testbox can remain published as ready until the provider eventually reclaims it. Add a bounded terminal callback on this post-Begin failure path before discarding the state.
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| if (line ~ /nopasswd:/) { | ||
| saw_nopasswd = 1 | ||
| commands = $0 | ||
| sub(/^.*NOPASSWD:[[:space:]]*/, "", commands) |
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When the installed rule is rendered as (root) SETENV: NOPASSWD: /usr/local/libexec/cmux-testbox-broker, this parser strips everything through NOPASSWD: and accepts the wrapper command without noticing SETENV. The sudoers(5) SETENV documentation states that command-line variables are exempt from the normal environment restrictions, so the runner can invoke the Bash wrapper with a controlled BASH_ENV; Bash sources that file as root before the wrapper reaches its PATH reset or self-check, restoring arbitrary root execution and access to broker secrets. Fresh evidence in the current revision is this concrete bypass of the newly restricted sudo-profile parser, rather than a dependency on unrestricted sudo.
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| "main-controlled Testbox broker workflow is missing: " | ||
| f"{WORKFLOW_PATH.relative_to(ROOT)}", | ||
| ) | ||
| return WORKFLOW_PATH.read_text(encoding="utf-8") |
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These tests read the workflow and shell files and assert that selected strings, regexes, and ordering are present, but never execute the broker lifecycle. A broken implementation can therefore retain the expected tokens while mishandling process isolation, cleanup, or provider callbacks and still pass CI, which is especially risky for this security boundary. Replace the source-shape checks with a runtime harness using fake provider endpoints and controlled state/processes, as required by the repository's test-quality policy.
AGENTS.md reference: AGENTS.md:L121-L121
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Bugbot is paused — on-demand spend limit reachedBugbot uses usage-based billing for this team and has hit its on-demand spend limit. A team admin can raise the spend limit in the Cursor dashboard, or wait for the next billing cycle to continue. |
lawrencecchen
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Bugbot is paused — on-demand spend limit reachedBugbot uses usage-based billing for this team and has hit its on-demand spend limit. A team admin can raise the spend limit in the Cursor dashboard, or wait for the next billing cycle to continue. |
lawrencecchen
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Summary
Use pinned Blacksmith Begin and Run actions as the only Testbox lifecycle owner.
The workflow:
refs/tags/cmux-testbox-broker-v1when GitHub reports that ref as protected;mainwith a bounded anonymous lookup, then fetches and checks out that exact commit without repository credentials;cargo build -p cmux-tui --locked;Trust model
Candidate code shares the vendor Testbox job. It can read Testbox-scoped state, Actions runtime state for this tag job, and caches available to the tag. It can consume shared cache quota. It receives no cmux repository secret, repository write permission, or OIDC permission.
GitHub cache scope and Blacksmith Branch Protected Caches prevent
mainfrom restoring a cache created by this tag. The Blacksmith organization setting was verified ON on 2026-08-14. Candidate code can still alter its current run artifacts and Testbox status. Strong provider-token isolation needs a Blacksmith primitive and is not claimed.Required external control
After merge:
cmux-testbox-broker-v1that restricts creation, update, and deletion, with one narrow temporary bypass.--ref cmux-testbox-broker-v1 --job cmux-tui-testbox --idle-timeout 10.No Blacksmith spending alert is configured. The 120-minute workflow limit bounds one run only. Operators must stop each Testbox explicitly.
Verification
actionlintgit diff --checkNo Testbox, build, workflow dispatch, tag change, settings change, or provider spend ran during review.
This replacement supersedes #10141.