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fix(macapp): Debug builds talk only to a local Codaset; requests name the build - #278
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…set.dev The Dev app and every test host are Debug builds, and they defaulted to production Codaset, so a local build created real users, devices and grants there. BrokerEndpoint now decides which Codaset a build reaches. Release and Nightly keep codaset.dev (or an https or 127.0.0.1 override). A Debug build defaults to the local bin/dev Codaset at https://codaset.localhost, ignores any override that is not localhost, *.localhost or 127.0.0.1, and BrokerClient and BrokerSignIn refuse any other URL before a request or the browser goes out. Tests still need no Codaset: they send through the in-process stub. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Broker requests now send `User-Agent: Workroom/<version> (<dev|nightly|release>; build <n>)`, so Codaset can show which build and version created each Mac's records. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe app resolves broker endpoints by build type and adds build metadata to broker requests. Reverse forwarding gives Debug enrolment a loopback broker URL through the agent connection. Tests cover endpoint rules, forwarding, reconnects, and enrolment. ChangesLocal broker routing
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Enrolment as AgentEnrolment
participant Registry as BrokerReverseForwards
participant Agent as Agent listener
participant Broker as Local broker
Enrolment->>Registry: Open workroom broker route
Registry->>Agent: Start reverse listener
Agent->>Registry: Announce accepted connection
Registry->>Agent: Claim connection
Registry->>Broker: Forward connection to configured target
Enrolment->>Agent: Run agent with loopback broker URL
Merge Risk: 🟡 Moderate · up to In Debug builds, a failed enrolment route setup can leave a listener for the development Codaset reopening on the remote host. That keeps the local server exposed and uses up agent listener slots. Release the route on that failure before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Development builds introduce a route through which processes on an attached remote machine can reach trusted local services on the Mac. Failed setup can also leave automatic reconnection active. Release and Nightly do not use this broker route, and no shipped application caller was found, limiting current exposure. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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🧪 Generate unit tests (beta)
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…tion
A Debug app must have its remote agent reach the Mac's own development
Codaset, and nothing carried a connection from the agent's box back to the
Mac. `Service::Forward` gains two methods, keeping its rule that the client
picks every stream id:
- `listen {port}` binds 127.0.0.1 only and answers with the bound port. Each
accepted connection is announced with a new ACCEPTED opcode on that stream.
- `accept {listener}`, on a new stream, claims the oldest waiting connection,
which from there is an ordinary forward: same budget, cap and CLOSE rule.
Unclaimed connections close after 5 s (under the broker client's 15 s
timeout), at most 8 wait per listener, a connection holds at most 4
listeners, and a listener ends with its client's CLOSE or the connection.
FORWARD_SERVICE_VERSION stays 1: the app rejects any other reply version, and
an older agent already refuses the new methods cleanly.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
… agent's loopback A Debug build talks only to a Codaset on this Mac, and its own URL, https://codaset.localhost, names the remote host when the agent there resolves it. So a Debug enrolment now hands the agent http://127.0.0.1:<port>, a listener on its own box that carries every connection back to the development Codaset's Puma on this Mac. - ReverseForward drives the agent's new `listen`/`accept` methods. Each announced connection is dialled to the target and claimed as an ordinary forward; one that cannot be dialled is claimed and closed at once, so the agent's git helper fails in under a second instead of at the agent's 5 s expiry. - BrokerReverseForwards (Debug only) keeps one listener per remote workroom, on a port derived from its ID so the URL in the agent's broker.json survives a reattach, and reopens it on each new connection to the host, retrying a bind that lost the race with the old connection's teardown. - AgentEnrolment takes the agent's broker URL from an AgentBroker seam: Release and Nightly pass codaset.dev as before. A route that cannot be made costs no grant, and a failed enrolment releases it with the grant. - The target is the brokerAgentTarget default (3000), Codaset's Puma rather than Caddy: the agent's proofs are signed for 127.0.0.1:<port>, and Caddy routes on the Host header. An end-to-end test runs a Debug enrolment through a real agent and a stub broker on loopback, and checks the broker saw the proof bound to the URL the agent was given. No Codaset is needed to run it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- A link lost without a goodbye leaves the old connection's listener holding the port until the agent notices, possibly minutes. The registry now keeps retrying on the new connection (every 5 s, for 5 minutes) instead of giving up until the next one. - A caller joining an open in flight now runs its own afterwards, since the open in flight may have been for an earlier connection. The open clears its own marker before it completes; clearing it from the caller let a waiter spin on the main actor. - A ReverseForward released after the agent ended its listener now closes the connections it was still carrying, rather than freeing them with no CLOSE. - LoopbackSocket.connect waits out an interrupted poll instead of calling it a timeout. - Claims dial concurrently, so one slow target cannot push the rest past the agent's 5 s pending timeout. Also recorded: in a Debug build, every process on the remote host can reach the Mac's development Puma through the listener, as loopback (full error pages and web-console's REPL). Accepted for Debug builds by the owner, and documented on BrokerReverseForwards with the fix to apply if remote hosts ever run untrusted code. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @macapp/WorkroomApp/Core/Broker/AgentEnrolment.swift:
- Around line 48-49: Update `enrol` so that if `agentBroker.url` throws, it
calls `agentBroker.release(workroomID)` and then rethrows the original error. In
`testNoRouteToTheBrokerAsksForNoGrant`, assert that `broker.released.count` is 1
to cover route cleanup.
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📒 Files selected for processing (9)
macapp/WorkroomApp/Core/AgentPortForwarding.swiftmacapp/WorkroomApp/Core/Broker/AgentEnrolment.swiftmacapp/WorkroomApp/Core/Broker/BrokerReverseForwards.swiftmacapp/WorkroomApp/Core/DefaultsKeys.swiftmacapp/WorkroomApp/Core/LoopbackSocket.swiftmacapp/WorkroomAppTests/Broker/BrokerSignInTests.swiftmacapp/WorkroomAppTests/Broker/ReverseForwardTests.swiftvcs/crates/wr-agent/src/forward.rsvcs/crates/wr-agent/tests/forward_service.rs
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…e agent ended Addresses the Greptile and CodeRabbit findings on #278: - An enrolment whose route to the broker fails now releases it. Before, the Debug registry kept the entry and its watch, and every later connection to the host reopened a listener for a workroom that never enrolled. - A listener the agent ends while the connection lives (its socket broke) is reopened through the same retry loop, rather than waiting for a reconnect that is not coming. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Oct 1, 2026
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Three changes to how the Mac and its remote agents talk to the credential broker. The Codaset side is joelmoss/codaset#45.
Debug builds never reach production Codaset
The Dev app and every test host are Debug builds, and they defaulted to
https://codaset.dev, so a local build created real users, devices and grants in production.BrokerEndpoint(inBrokerSession.swift) now decides which Codaset a build reaches:codaset.dev, or abrokerURLoverride that is https orhttp://127.0.0.1.bin/devCodaset athttps://codaset.localhost;localhost,*.localhostor127.0.0.1;BrokerClient.sendandBrokerSignIn.runrefuse any other URL before a request or the browser goes out, so a client built with the wrong URL is refused too.BrokerStub. The test URLs moved fromcodaset.testtocodaset.localhostso they pass the Debug check.A Debug build's remote agent reaches the Mac's development Codaset
The Debug rule above left remote enrolment broken: the Mac's own URL,
https://codaset.localhost, names the remote host itself when the agent there resolves it (Greptile; plan on #252). Now a Debug enrolment hands the agenthttp://127.0.0.1:<port>, a listener on its own box that carries every connection back over the agent connection to the development Codaset's Puma on this Mac.forward.rs):Service::Forwardgainslisten {port}andaccept {listener}. The agent binds127.0.0.1only and announces each connection with a new ACCEPTED opcode. The client claims it on a stream it opens, and from there it is an ordinary forward. Unclaimed connections close after 5 s, at most 8 wait per listener, and a connection holds at most 4 listeners. No version bump: the methods are additive, and an older agent refuses them cleanly.ReverseForwarddials the target for each announced connection. One it cannot dial is claimed and closed at once, so the git helper fails in under a second.BrokerReverseForwards(Debug only) keeps one listener per remote workroom, on a port derived from its ID, sobroker.json's URL survives a reattach. It reopens the listener on each new connection and keeps retrying while a dead link's old listener still holds the port.AgentEnrolmenttakes the agent's URL from anAgentBrokerseam. Release and Nightly behave as before.brokerAgentTarget(3000), not Caddy, because Caddy routes on the Host header and the agent's proofs are signed for127.0.0.1:<port>. joelmoss/codaset#46 pins Puma to 3000.Accepted exposure (owner's decision): in a Debug build, every process on the remote host can reach the Mac's development Puma through the listener, and Rails sees it as loopback, which means full error pages and web-console's REPL. Release and Nightly contain none of this.
BrokerReverseForwardsrecords the fix to apply if remote hosts ever run untrusted code: filter the relay toPOST /broker/…and set a non-loopbackX-Forwarded-For.Dev-only limit: a Dev remote workroom mints only while the Mac is attached. The token the agent already holds covers up to an hour.
Every broker request names the build and version
Requests now send
User-Agent: Workroom/<version> (<dev|nightly|release>; build <n>). Codaset stores it per Mac and shows it on the account page.Validation
make app-teston the broker and forwarding classes (ReverseForwardTests,AgentEnrolmentTests,AgentPortForwardingTests,BrokerClientTests,BrokerSessionTests,BrokerSignInTests,DefaultsIsolationTests): 59 of 59 pass.POST /broker/enrolmentswithHostandhtuset to the URL the agent was given, andbroker.jsonholds it withenrolled: true. No Codaset is needed.cargo test -p wr-agentpasses in full (outside the sandbox, which blocks ptys). That includes 9 new forward-service integration tests and 2 new unit tests. Removing pending expiry, the pending cap, or the drop-time kill each fails its test; one of those tests had been passing for the wrong reason and was fixed.make app-lintexits 0;cargo fmtandcargo clippyare clean.wr-agentand Mac changes (macapp rule 3):poll, serial claims). The rest are recorded: listener-cap counting during close, re-enrolment release (no caller yet, Portable derivation on the container driver: the base machine and deriveFromBase #252), and the untestable Release branch.make app-testsuite and the UI tests. Only broker and forward code changed.🤖 Generated with Claude Code
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