fix(stargate-k8s-router): support explicit Raw QUIC upstream trust by mikeyrcamp · Pull Request #1327 · NVIDIA/nvcf

mikeyrcamp · 2026-08-28T19:48:19Z

TL;DR

Allow Raw QUIC mode to use --upstream-tls-cert-path as a dedicated CA bundle for connections from stargate-k8s-router to Stargate pods. This separates the router serving identity from its outbound trust configuration.

Additional Details

Raw QUIC previously reused the router serving certificate as the upstream trust source and rejected the explicit upstream CA option. Managed deployments can terminate worker-facing QUIC with one certificate while trusting a separate private CA for Stargate pod certificates.

The Raw QUIC client now prefers STARGATE_UPSTREAM_TLS_CERT_PATH. When it is absent, the existing serving-certificate fallback remains for backward compatibility. WebTransport behavior is unchanged.

For the Reviewer

Please focus on the trust selection in quic.rs and the startup configuration test in main.rs.

For QA

cargo fmt --all -- --check
cargo test -p stargate-k8s-router
cargo clippy -p stargate-k8s-router --all-targets -- -D warnings

QA is covered by unit and router integration tests. A deployment follow-up can wire the dedicated CA path after a release containing this change is available.

Issues

Fixes #1325

Checklist

I am familiar with the Contributing Guidelines.
I have signed off my commits for Developer Certificate of Origin (DCO) compliance.
New or existing tests cover these changes.
The documentation is up to date with these changes.

Dependency / License / NOTICE impact

No dependencies or vendored code were added or changed; no license or NOTICE updates are required.

Summary by CodeRabbit

New Features
- Added support for separate upstream TLS trust certificates for Raw QUIC and WebTransport connections.
- Raw QUIC can use a dedicated upstream certificate bundle, with fallback to the serving certificate when none is provided.
- Added consistent TLS configuration across tunnel transport options.
Bug Fixes
- Improved validation for missing, empty, malformed, or unreadable upstream certificate bundles.
Documentation
- Updated tunnel transport documentation to describe certificate configuration, fallback behavior, and insecure mode.

coderabbitai · 2026-08-28T19:49:41Z

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Reviewing files that changed from the base of the PR and between 0b15b12 and db18097.

📒 Files selected for processing (1)

src/libraries/rust/stargate/crates/stargate-k8s-router/src/main.rs

🚧 Files skipped from review as they are similar to previous changes (1)

src/libraries/rust/stargate/crates/stargate-k8s-router/src/main.rs

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📝 Walkthrough

Walkthrough

The router now accepts a dedicated upstream CA bundle for Raw QUIC. Startup loads and validates the bundle once. Raw QUIC uses it first and falls back to the serving certificate. WebTransport reuses the loaded bundle.

Changes

TLS trust configuration

Layer / File(s)	Summary
Load and wire upstream trust material `src/libraries/rust/stargate/crates/stargate-k8s-router/src/main.rs`, `src/libraries/rust/stargate/docs/tunnel-transports.md`	Startup loads and validates the optional upstream CA bundle. Raw QUIC accepts the option. WebTransport reuses the loaded bundle. Documentation describes separate TLS roles and fallback behavior.
Select Raw QUIC trust material `src/libraries/rust/stargate/crates/stargate-k8s-router/src/quic.rs`, `src/libraries/rust/stargate/crates/stargate-k8s-router/src/main.rs`	`QuicRouterConfig` stores optional upstream trust material. Raw QUIC prefers it over `tls_cert_pem` and falls back to the serving certificate. Tests cover precedence, fallback, trust separation, and invalid or unreadable bundles.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to db180

The change adds dedicated upstream CA selection for Raw QUIC while preserving the existing fallback and leaving WebTransport unchanged; no actionable merge-blocking risk remains beyond normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant RouterStartup
  participant RawQuicConfig
  participant QuicRouterRuntime
  participant UpstreamQuicClient
  RouterStartup->>RouterStartup: Load and validate optional upstream CA bundle
  RouterStartup->>RawQuicConfig: Pass upstream CA bundle
  QuicRouterRuntime->>RawQuicConfig: Select upstream trust
  RawQuicConfig-->>QuicRouterRuntime: Return dedicated bundle or serving certificate
  QuicRouterRuntime->>UpstreamQuicClient: Build upstream client configuration

Suggested reviewers: nvaghela-oss

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 58.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy issue `#1325`. Raw QUIC accepts the upstream trust option, uses the dedicated bundle with serving-certificate fallback, preserves the worker-facing identity and hostname verification…
Out of Scope Changes check	✅ Passed	The code, tests, and documentation changes directly support the linked issue objectives. No unrelated changes are identified.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title uses valid Conventional Commits syntax with the required scoped `fix` type. It accurately describes the Raw QUIC upstream trust change.

Full details: Linked Issues check

Explanation

The changes satisfy issue #1325. Raw QUIC accepts the upstream trust option, uses the dedicated bundle with serving-certificate fallback, preserves the worker-facing identity and hostname verification, rejects invalid input, preserves WebTransport behavior, and adds the required tests.

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Signed-off-by: Mike Camp <mcamp@nvidia.com>

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Inline comments:
In `@src/libraries/rust/stargate/crates/stargate-k8s-router/src/main.rs`:
- Line 181: Update RouterStartupConfig::from_args to validate
upstream_tls_cert_pem when quic_insecure is false, rejecting malformed or empty
trust bundles before startup proceeds while preserving the insecure path. Add
coverage for invalid and unreadable bundles, and update the related startup
sequence diagram if the validation changes startup ordering.

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Reviewing files that changed from the base of the PR and between 2734d7b and 0b15b12.

📒 Files selected for processing (3)

src/libraries/rust/stargate/crates/stargate-k8s-router/src/main.rs
src/libraries/rust/stargate/crates/stargate-k8s-router/src/quic.rs
src/libraries/rust/stargate/docs/tunnel-transports.md

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github-actions · 2026-08-28T20:10:32Z

🛡️ CodeQL Analysis

🚨 Found 5 issue(s)

Severity Breakdown:

🔴 Errors: 0
🟡 Warnings: 0
🔵 Notes: 0

📋 Top Issues

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_{🕐 Last updated: 2026-08-28 20:10:31 UTC | Commit: 0b15b12}

Signed-off-by: Mike Camp <mcamp@nvidia.com>

mikeyrcamp requested a review from a team as a code owner August 28, 2026 19:48

mikeyrcamp requested a review from nvaghela-oss August 28, 2026 19:48

fix(stargate-k8s-router): separate Raw QUIC upstream trust

0b15b12

Signed-off-by: Mike Camp <mcamp@nvidia.com>

mikeyrcamp force-pushed the mcamp/fix/raw-quic-upstream-ca branch from bce4f41 to 0b15b12 Compare August 28, 2026 19:52

coderabbitai Bot reviewed Aug 28, 2026

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Comment thread src/libraries/rust/stargate/crates/stargate-k8s-router/src/main.rs

fix(stargate-k8s-router): validate upstream TLS trust bundle

db18097

Signed-off-by: Mike Camp <mcamp@nvidia.com>

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fix(stargate-k8s-router): support explicit Raw QUIC upstream trust - #1327

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