[PR #6136] [client] Improve rosenpass support #27605

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saavagebueno · 2026-08-05T07:08:57-04:00

saavagebueno commented

2026-08-05 07:08:57 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/6136

State: closed
Merged: Yes

Describe your changes

This PR bundles several related changes to the Rosenpass support in the
client agent:

Bump cunicu.li/go-rosenpass from v0.4.0 to v0.5.42. The upstream
library was pinned at a release from September 2023, ~40 releases behind
the current upstream. The bump pulls in protocol fixes from upstream
(resolves the recurring failed to load biscuit (ICR1): detected replay slog errors observed in production). Transitive bumps:
- cilium/ebpf 0.15 → 0.19,
- gopacket/gopacket 1.1.1 → 1.4.0,
- wireguard/wgctrl updated. Wire-protocol interop between v0.4.0 and
  v0.5.42 verified end-to-end (cross-version handshake works), so no
  flag-day rollout is required.
Fix nil-receiver crash on Android (#4341). When Engine.Run() had
not completed before OnConnected fired, m.rpWgHandler was nil and
m.rpWgHandler.AddPeer(...) in addPeer panicked. NewManager now
pre-initializes rpWgHandler, and addPeer has explicit nil guards
for both m.server and m.rpWgHandler as defense in depth.
generateConfig keeps replacing the handler on each Run() so peer
state from previous engine sessions is not retained.
Normalize peer endpoint to IPv4-mapped IPv6. The Rosenpass UDP
server binds on the IPv6 wildcard [::] and net.ResolveUDPAddr returns
a 4-byte IPv4 for IPv4 hosts, which the kernel rejected with EDESTADDRREQ
on Linux when the lib called sendto from the AF_INET6 socket. The
initiator path in addPeer now converts the remote endpoint to
IPv4-mapped IPv6 so its family matches the listening socket.
Move rosenpassDetermKey into the rosenpass package as the
exported DeterministicSeedKey, closing the // todo: move this logic into Rosenpass package left at conn.go:911. While moving:
- Replace append(lk[:16], rk[:16]...) with append onto an empty
  slice so the //nolint:gocritic suppression is no longer needed.
- Validate input length (>= 16 bytes) so the function returns an
  error instead of panicking on out-of-range slicing.
- Wrap returned errors with package-scoped context.
- Doc comment makes explicit that the seed is deterministic and not
  post-quantum safe; Rosenpass replaces it with a real PQ PSK on
  first rotation.
Decouple rp.Server behind an rpServer interface so the manager
can be exercised without spinning up a real UDP server, and add unit
tests covering the initiator/responder tie-break, peer lifecycle,
PSK rotation updateOnly semantics, error propagation, and the new
nil-guard branches.

Issue ticket number and link

GitHub: https://github.com/netbirdio/netbird/issues/4341

Stack

Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)

By submitting this pull request, you confirm that you have read and agree to the terms of the Contributor License Agreement.

Documentation

Select exactly one:

I added/updated documentation for this change
Documentation is not needed for this change (explain why)

Internal change only. The public NetBird CLI/API surface and the Rosenpass
feature behavior are unchanged: the dependency bump is transparent to users
(wire-compatible with v0.4.0), the nil-guard prevents a crash without
altering normal flow, the endpoint normalization restores the intended send
behavior on Linux, and the function move/refactor preserves inputs, outputs,
and call semantics.

Docs PR URL (required if "docs added" is checked)

Paste the PR link from https://github.com/netbirdio/docs here:

N/A

Summary by CodeRabbit

New Features
- Deterministic preshared-key generation added for peer handshakes.
Bug Fixes
- Prevented panics by initializing internal handlers earlier and returning explicit errors when components are unready.
- Normalized IPv4 endpoints to IPv6-mapped form for consistent connectivity.
Tests
- Expanded test suite covering key derivation, manager/handler behaviors, endpoint selection, and edge cases.
Chores
- Updated several dependencies (Rosenpass, WireGuard, eBPF, packet libraries).

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/6136 **State:** closed **Merged:** Yes --- ## Describe your changes This PR bundles several related changes to the Rosenpass support in the client agent: 1. **Bump `cunicu.li/go-rosenpass` from v0.4.0 to v0.5.42.** The upstream library was pinned at a release from September 2023, ~40 releases behind the current upstream. The bump pulls in protocol fixes from upstream (resolves the recurring `failed to load biscuit (ICR1): detected replay` slog errors observed in production). Transitive bumps: - `cilium/ebpf` 0.15 → 0.19, - `gopacket/gopacket` 1.1.1 → 1.4.0, - `wireguard/wgctrl` updated. Wire-protocol interop between v0.4.0 and v0.5.42 verified end-to-end (cross-version handshake works), so no flag-day rollout is required. 2. **Fix nil-receiver crash on Android (#4341).** When `Engine.Run()` had not completed before `OnConnected` fired, `m.rpWgHandler` was nil and `m.rpWgHandler.AddPeer(...)` in `addPeer` panicked. `NewManager` now pre-initializes `rpWgHandler`, and `addPeer` has explicit nil guards for both `m.server` and `m.rpWgHandler` as defense in depth. `generateConfig` keeps replacing the handler on each `Run()` so peer state from previous engine sessions is not retained. 3. **Normalize peer endpoint to IPv4-mapped IPv6.** The Rosenpass UDP server binds on the IPv6 wildcard `[::]` and `net.ResolveUDPAddr` returns a 4-byte IPv4 for IPv4 hosts, which the kernel rejected with `EDESTADDRREQ` on Linux when the lib called `sendto` from the AF_INET6 socket. The initiator path in `addPeer` now converts the remote endpoint to IPv4-mapped IPv6 so its family matches the listening socket. 4. **Move `rosenpassDetermKey` into the `rosenpass` package** as the exported `DeterministicSeedKey`, closing the `// todo: move this logic into Rosenpass package` left at `conn.go:911`. While moving: - Replace `append(lk[:16], rk[:16]...)` with `append` onto an empty slice so the `//nolint:gocritic` suppression is no longer needed. - Validate input length (`>= 16` bytes) so the function returns an error instead of panicking on out-of-range slicing. - Wrap returned errors with package-scoped context. - Doc comment makes explicit that the seed is deterministic and **not** post-quantum safe; Rosenpass replaces it with a real PQ PSK on first rotation. 5. **Decouple `rp.Server` behind an `rpServer` interface** so the manager can be exercised without spinning up a real UDP server, and add unit tests covering the initiator/responder tie-break, peer lifecycle, PSK rotation `updateOnly` semantics, error propagation, and the new nil-guard branches. ## Issue ticket number and link GitHub: <https://github.com/netbirdio/netbird/issues/4341> ## Stack  ### Checklist - [x] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [x] It is a refactor - [ ] Created tests that fail without the change (if possible) > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) Internal change only. The public NetBird CLI/API surface and the Rosenpass feature behavior are unchanged: the dependency bump is transparent to users (wire-compatible with v0.4.0), the nil-guard prevents a crash without altering normal flow, the endpoint normalization restores the intended send behavior on Linux, and the function move/refactor preserves inputs, outputs, and call semantics. ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: N/A  ## Summary by CodeRabbit * **New Features** * Deterministic preshared-key generation added for peer handshakes. * **Bug Fixes** * Prevented panics by initializing internal handlers earlier and returning explicit errors when components are unready. * Normalized IPv4 endpoints to IPv6-mapped form for consistent connectivity. * **Tests** * Expanded test suite covering key derivation, manager/handler behaviors, endpoint selection, and edge cases. * **Chores** * Updated several dependencies (Rosenpass, WireGuard, eBPF, packet libraries).  [![Review Change Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/netbirdio/netbird/pull/6136)

saavagebueno added the pull-request label 2026-08-05 07:08:57 -04:00

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Reference: DYNR/netbird#27605