alknet/tasks/auth/client-auth-handler.md at main

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glm-5.1 5c820a41e9 tasks: decompose Phase 0a ADR foundation and mark prior tasks completed

Add 10 new tasks under tasks/architecture/ for Phase 0a (ADR writing):
- 9 ADR tasks (026-034) with dependency-ordered structure
- 1 review checkpoint task before Phase 0b spec writing

ADR dependency graph (3 generations):
  Gen 1 (parallel): 026, 029, 030, 031, 032, 034
  Gen 2 (depends on 029): 027, 028
  Gen 3 (depends on 027+028): 033
  Gen 4: review checkpoint

Also mark all 34 prior implementation tasks as completed — they
were finished but still showing as pending in the taskgraph.

2026-06-07 08:55:33 +00:00

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id, name, status, depends_on, scope, risk, impact, level

name

status

depends_on

scope

risk

impact

level

auth/client-auth-handler

Implement client-side SSH authentication with Ed25519 key pairs

completed

auth/key-loading

auth/error-types

narrow

low

component

implementation

Description

Implement the client-side SSH authentication. The client presents an Ed25519 private key during SSH handshake. This creates the russh::client::Handler implementation and the russh::client::ConnectStreamConfig that uses the loaded key.

No password auth. The client handler is simpler than the server — it just needs to provide the private key and handle the auth callback from russh.

Acceptance Criteria

crates/alknet-core/src/auth/client_auth.rs exports ClientAuthConfig and client handler
ClientAuthConfig holds: private_key: KeyPair, optional public_key: PublicKey
ClientAuthConfig::from_key_source(source: KeySource) -> Result<Self> — loads key via key-loading module
Implements russh::client::Handler with auth_publickey() returning the public key
Client handler returns russh::client::AuthResult::Accept or appropriate auth state
Unit tests: valid key creates handler, auth flow succeeds with mock SSH session

References

docs/architecture/client.md — "Authentication is Ed25519 public key or OpenSSH certificate (ADR-012)"
docs/architecture/decisions/012-auth-ed25519-and-cert-authority.md — key-based auth only

Notes

To be filled by implementation agent

Summary

To be filled on completion

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