An in-container hook curl carries Host: host.docker.internal:<port> (the derived
CODEMAN_API_URL), so the always-on host guard must allow host.docker.internal /
host.containers.internal or every in-container hook is blocked 403. Exact-match
only; not a browser DNS-rebinding surface (resolves to the host only from inside
a container netns). Verified end-to-end: quick-start launches claude/shell in a
real container with the workspace bind-mounted and hooks scaffolded.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adds an always-on Host-header allowlist and a cross-site Origin/CSRF guard,
hardens the text/plain body parser, validates the WebSocket upgrade origin,
and escapes AI-derived fields in the subagent panel. Closes the two
CRITICALs and 5 HIGHs from the 2026-06-09 adversarial security review.
- C1: no Host allowlist -> DNS rebinding drove the full API (RCE) on the
default no-auth loopback install. New registerHostGuard rejects rebound
custom domains; allows loopback, any IP literal, the bind host,
*.ts.net / *.trycloudflare.com / *.cfargotunnel.com, the active managed
tunnel, and CODEMAN_ALLOWED_HOSTS.
- C2: a global text/plain parser JSON-parsed every body, enabling cross-site
simple-request CSRF. Parser now keeps the raw string; /api/crash-diag
self-parses; the global Origin guard rejects cross-site state changes.
- H1/H3/H6: self-update, session create/input, and settings/tunnel toggles
were CSRF-triggerable -> now covered by the Origin guard.
- H4: the subagent activity panel injected raw AI tool names/inputs into
innerHTML (executed under CSP 'unsafe-inline'). All sinks now escapeHtml'd.
- H5: the WebSocket upgrade had no Origin/Host check (CSWSH) -> now validated.
A missing Origin is allowed so curl/CLI and Claude Code hooks keep working;
custom reverse-proxy domains need CODEMAN_ALLOWED_HOSTS=host,.suffix.
Deferred: H2 (self-update tag signing, needs signing infra) and CSP
'unsafe-inline' removal (needs a nonce migration).
Tests: test/network-host-guard.test.ts (19), test/routes/ws-routes.test.ts
updated. Report: docs/reports/security-review-2026-06-09.md
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Codeman maintainer