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fix: verify private Tailscale endpoints through tsnet - #608
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (3)
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Included review availability: Your plan provides up to 8 included reviews per hour; 3 remain after this review. WalkthroughThe gateway now supports private endpoint verification through a loopback relay. Tailscale creates and manages the relay, endpoint verification routes probes through it, and probe errors receive classified diagnostics. Endpoint contracts carry the relay address. ChangesPrivate endpoint verification
TypeScript test configuration
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant TailscaleProvider
participant startVerificationRelay
participant tierForwarder
participant GatewayVerifier
participant HTTPSChallenge
TailscaleProvider->>startVerificationRelay: establish private verification relay
startVerificationRelay->>tierForwarder: start loopback forwarder
TailscaleProvider-->>GatewayVerifier: advertise VerificationAddress
GatewayVerifier->>tierForwarder: connect to verification address
tierForwarder->>HTTPSChallenge: forward HTTPS challenge
HTTPSChallenge-->>GatewayVerifier: return status and nonce
TailscaleProvider->>tierForwarder: close relay during teardown
Merge Risk: ⚪ Minimal · up to This incremental batch only touches a test-configuration file and the endpoint verification source/test files, and no functional defect was found in the configuration change. There is no evidence of new risk introduced by this increment. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 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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| Filename | Overview |
|---|---|
| internal/gateway/endpoint_verify.go | Selects the private relay transport and expands probe diagnostics, but body-read timeout classification misses net.Error timeouts. |
| internal/gateway/endpoint_transport.go | Implements loopback relay resolution, policy-aware dialing, address validation, and sanitized transport-error classification. |
| extensions/connectivity/tailscale/verification.go | Creates a private-tier-only loopback relay with a fixed tsnet destination. |
| extensions/connectivity/tailscale/provider.go | Publishes the runtime verification address and ties relay startup and shutdown to tier lifecycle. |
| internal/gateway/endpoint_verify_test.go | Adds TLS relay and diagnostic coverage, including a body-read timeout expectation inconsistent with the production check. |
| internal/extension/contract/gateway_source.go | Adds the optional verification address to the connectivity wire contract. |
| sdk/typescript/vitest.config.ts | Converts the Vitest configuration to typed CommonJS using ViteUserConfig. |
Sequence Diagram
sequenceDiagram
participant Core as Gateway verifier
participant Relay as Loopback relay
participant TS as Embedded tsnet
participant Endpoint as Private HTTPS endpoint
Core->>Relay: TLS connection using advertised host/SNI
Relay->>TS: Dial fixed private destination
TS->>Endpoint: Forward opaque TLS bytes
Core->>Endpoint: GET exact challenge path
Endpoint-->>Core: HTTP 200 and exact tier nonce
Core->>Core: Verify certificate, hostname, status, and nonce
Reviews (3): Last reviewed commit: "fix: address endpoint verification revie..." | Re-trigger Greptile
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Actionable comments posted: 4
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Inline comments:
In `@internal/gateway/endpoint_verify_test.go`:
- Line 425: Update the address-verification test loop to create a named subtest
with t.Run("Should ...") for each address case, preserving the existing
rejection assertions and making each invalid address report independently.
- Around line 434-437: Strengthen the failure assertion in the test around
Verify so it checks both errors.Is(err, ErrEndpointUnverified) and that the
error contains “invalid endpoint descriptor”. Keep the existing sentinel
assertion while requiring the descriptor-specific message to distinguish
validation failures from later probe, policy, TLS, or transport errors.
In `@internal/gateway/endpoint_verify.go`:
- Line 128: Update the handling around readBoundedChallengeBody to pass timeout
and cancellation errors through endpointProbeError, while preserving “challenge
response is invalid” for other body-read and close errors. Add a regression test
using a response body that stalls beyond the verifier timeout.
In `@sdk/typescript/vitest.config.ts`:
- Line 18: Update the Vitest configuration type annotation at the satisfies
clause to use the supported ViteUserConfig export from vitest/config, or replace
the annotation with defineConfig-based type inference; do not reference the
unavailable UserConfig export.
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ℹ️ Review info
⚙️ Run configuration
Configuration used: Path: .coderabbit.yaml
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Plan: Advanced
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⛔ Files ignored due to path filters (7)
docs/_memory/change-impact.mdis excluded by!**/*.mddocs/qa/reports/2026-09-10-issue-602-endpoint-verification.mdis excluded by!**/*.mddocs/qa/scenarios/RT-connectivity-provider-route.mdis excluded by!**/*.mdpackages/site/content/docs/extensions/develop.mdxis excluded by!**/*.mdxpackages/site/content/docs/gateway/tailscale.mdxis excluded by!**/*.mdxsdk/typescript/src/generated/contracts.tsis excluded by!**/generated/**,!**/generated/**skills/compozy/references/runtime-operations.mdis excluded by!**/*.md
📒 Files selected for processing (13)
extensions/connectivity/tailscale/forwarder.goextensions/connectivity/tailscale/node.goextensions/connectivity/tailscale/provider.goextensions/connectivity/tailscale/provider_test.goextensions/connectivity/tailscale/verification.gointernal/extension/contract/gateway_source.gointernal/extension/gateway_source.gointernal/gateway/connectivity.gointernal/gateway/endpoint_transport.gointernal/gateway/endpoint_verify.gointernal/gateway/endpoint_verify_test.gosdk/go/contracts/types_006_gen.gosdk/typescript/vitest.config.ts
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First CodeRabbit review inventory: review 5172795956, all inline threads, and the expanded checks in summary comment 5626041317.
Greptile completed its implementation review and the preview-install follow-up without actionable findings (summary comment 5626086860). The operator revised delivery to one consolidated first-review remediation and current-head green GitHub CI. Subsequent local gates/heavy validation and additional review rounds are not required; no second review was requested. The owned queued local gate was canceled. Earlier completed local evidence remains valid for the inputs it checked, and CI owns delivery validation of c8e7429. |
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1 participant
What & why
Closes #602.
When CompozyOS runs the bundled Tailscale provider on a host without a host-level Tailnet route,
the embedded node can be connected and remotely reachable while core endpoint verification fails.
The provider owns a userspace tsnet network in its subprocess, but the verifier previously used
net.DefaultResolverandnet.Dialerin the host network. All HTTP transport errors becameendpoint probe failed, obscuring this distinction. A successful remote request to/does notprove the exact daemon-owned tier challenge.
The private provider now opens a bounded loopback TCP relay to its own private endpoint using
tsnet.Server.Dial. The core sends TLS through that relay, retaining the advertised URL for SNI,certificate trust/hostname verification, HTTP Host, the challenge path and exact nonce comparison.
It still follows no redirects, bounds the response/deadline, and advertises only after proof.
The relay cannot select arbitrary destinations and closes with its tier before node shutdown.
Public Funnel proof rejects private verification transports and retains authenticated public DNS
and the existing outbound address policy. Existing providers that omit the new optional
verification_addressfield keep the direct verification path. Diagnostics distinguish DNS,connection refusal/unreachable routing, timeout, cancellation, certificate failure, redirect
refusal, HTTP status and nonce mismatch without exposing raw transport errors or challenge secrets.
How you verified it
exact nonce, public-tier rejection and invalid relay addresses. Existing gateway suites cover
tier binding, redirect/body/deadline/outbound policy rejection and advertisement/recovery.
exact challenge path/response, check stable status identity and prove closure after teardown.
tailscale.com/tsnetTestSelfDialpassed with race detection using its ownlocal test control server and virtual node. No real Tailnet credentials or host setup were used.
make codegenandmake gateevidence are detailed in the QA report.The host is macOS. An isolated Linux/systemd VPS, disposable authorized Tailnet credentials,
public certificate issuance and remote device were not available. These local checks do not claim
that the reporter's external Tailnet/Linux scenario passed. The affected QA scenario preserves
that limitation. No active gateway, auth key, host Tailscale installation or Tailnet device changed.
Impact
config keys, public Gateway DTOs, migrations or authentication changes.
include the relay address. Provider trust and private/public ownership remain unchanged.
cross-surface audit and
RT-connectivity-provider-routeQA evidence.native-loader warning encountered in the required gate without suppressing diagnostics.
The first Vercel build used Bun 1.3.14, ignored the newer lockfile and installed drifting
dependencies, causing unrelated Fumadocs/Zod type errors. No Vercel project settings changed.
See
docs/qa/reports/2026-09-10-issue-602-endpoint-verification.mdand the issue's section indocs/_memory/change-impact.mdfor evidence boundaries and compatibility details.First CodeRabbit review: four inline findings were fixed together in
c8e742972; all threadswere answered with evidence and resolved. The two general warnings have documented dispositions
in the complete review inventory.
Greptile reported no actionable findings. Per the updated delivery instruction, another review
round is not a completion requirement; current-head GitHub CI owns delivery validation.
make gatelocally. Per theoperator's instruction, subsequent gates run in PR CI to preserve local machine capacity.