glm-5.1
596c89ce24
Rename all crates, CLI commands, constants, type names, doc comments, and documentation from wraith to alknet. Includes wire-protocol changes: ALPN wraith-ssh -> alknet-ssh, reserved destination prefix wraith- -> alknet-, SSH auth username wraith -> alknet.
47 lines
2.1 KiB
Markdown
47 lines
2.1 KiB
Markdown
---
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id: auth/server-auth-handler
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name: Implement server-side authentication (Ed25519 keys + OpenSSH cert-authority)
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status: pending
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depends_on:
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- auth/key-loading
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- auth/error-types
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scope: moderate
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risk: medium
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impact: component
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level: implementation
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---
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## Description
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Implement the server-side SSH authentication logic per ADR-012:
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1. **Ed25519 public key**: `auth_publickey()` checks presented key against the authorized set using constant-time comparison
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2. **OpenSSH certificate authority**: validates presented certificate — checks CA signature, expiry, and principal restrictions (`permit-port-forwarding`, `no-pty`, `source-address`)
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No password authentication over SSH. This is the `russh::server::Handler::auth_publickey()` implementation that the server handler will call.
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## Acceptance Criteria
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- [ ] `crates/alknet-core/src/auth/server_auth.rs` exports `ServerAuthConfig` and auth logic
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- [ ] `ServerAuthConfig` holds: `authorized_keys: HashSet<PublicKey>`, `cert_authorities: Vec<CertAuthorityEntry>`
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- [ ] `ServerAuthConfig::from_keys_and_ca()` constructor: loads authorized keys and cert-authority entries from provided key sources
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- [ ] Auth check function: given a presented key/certificate, return `Accept` or `Reject`
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- [ ] Ed25519 key matching uses constant-time comparison (via `russh`/`ssh-key` crate builtins)
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- [ ] Certificate validation checks: CA signature valid, cert not expired, principal restrictions enforced
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- [ ] Certificate options respected: `permit-port-forwarding`, `no-pty`, `source-address`
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- [ ] Returns `AuthError::KeyRejected` or `AuthError::CertInvalid`/`CertExpired`/`CertPrincipalMismatch` on failure
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- [ ] Unit tests: valid key accepted, invalid key rejected, cert-authority signed cert accepted, expired cert rejected, wrong principal rejected
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## References
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- docs/architecture/server.md — Authentication section
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- docs/architecture/decisions/012-auth-ed25519-and-cert-authority.md — ADR for key + cert-authority
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- docs/architecture/client.md — "Authentication is Ed25519 public key or OpenSSH certificate"
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## Notes
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> To be filled by implementation agent
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## Summary
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> To be filled on completion |