dsh-local-no-auth

A DeepSeek Harness Cordis plugin that bypasses the dsh web browser-session authentication for the loopback-local instance — no launch token, no cookie — without modifying a single line of upstream source.

Package	@falling-ts/dsh-local-no-auth
License	MIT
Platform	Host-only (no client half, no UI)

Why

dsh web guards its surface with a launch-token exchange (the ?token=... on the printed URL) plus a signed browser cookie. That is correct for remote or shared deployments, but for a loopback-only local instance it is pure ceremony: any host that can reach the port is a host already on the machine.

How it works (no source changes)

Upstream routes every authentication decision through the live ctx.connection service instance's methods:

method	gate
requestRejection	/api surface (RPC, streams, gateway) — 401/403
authorizeIndex	frontend index request — token/cookie exchange
authenticatedUrl	printed startup URL — appends the launch token

This plugin, in its own apply, first checks the live webServer bind host and refuses to start unless it is a loopback literal, then replaces those three instance methods at runtime:

connection.requestRejection = () => undefined   // every /api request proceeds
connection.authorizeIndex   = () => true        // index serves immediately
connection.authenticatedUrl = (url) => url      // printed URL stays clean

Every consumer (the /api route, the frontend-static fallback seat, the API gateway, the web-app URL announcement) calls them by instance reference, so the whole local surface becomes token- and cookie-free at once. On unload (dispose) the original methods are restored.

Bundled fix: upstream bogus "plugin metadata" diagnostics (2026-09-23)

Harness 0.1.7-alpha.2's profile-resolution interception unconditionally rewrites error.stack before re-throwing a resolution error (throwWithImporter / throwWithoutCjsAnchor in resolver.ts). Node's internal ERR_PACKAGE_PATH_NOT_EXPORTED exposes stack as a non-writable own property on some Node builds (measured: {writable:false, configurable:true}), so the assignment throws TypeError: Cannot assign to read only property 'stack'. That TypeError no longer matches the metadata reader's "resource absent" classification, so the Plugins page reports "包元信息错误 / Plugin metadata for : TypeError: …" for nearly every package — official ones included.

Read this as a display bug, not a functional one: in a measured inventory of 184 entries, zero were enabled && !active; every flagged entry was active. And it is not reachable from configuration — the metadata read runs for every entry unconditionally, none of plugin-inventory / plugin-manager / pluginPackages exposes a relevant switch, and the crash sits below the whole configuration surface.

This plugin therefore also wraps ctx.pluginPackages.metaOf at runtime, dropping only the diagnostic whose text contains Cannot assign to read only property 'stack', and recovering display text from the package manifest's name / description; every other metadata diagnostic passes through untouched. The shim is best-effort and pluginPackages is deliberately not in inject — when the service is absent the shim is skipped with a warning and the authentication bypass is unaffected.

Once upstream wraps those two assignments in try/catch, this shim can be deleted and the plugin returns to doing only the no-auth bypass.

Safety boundary

• Bind-host gate: apply reads the live webServer bind host and refuses unless it is 127.0.0.1 or localhost (see How a refusal reaches the process below). The upstream webserver Config schema only accepts '127.0.0.1' | '0.0.0.0', so 0.0.0.0 (all interfaces) always fails and the bypass never silently activates against a reachable-by-others listen.
• dsh web binds loopback and the CLI rejects --host 0.0.0.0, so this bypass cannot, by itself, expose the server to other hosts.
• Never combine with anything that makes the reach accessible beyond the local machine (SSH forwarders on shared boxes, VLAN loopback, NAT hairpin).
• Authorization of remote requests is unchanged only because there are none on a loopback bind; if upstream ever allows non-loopback binds, this plugin refuses rather than silently bypassing.

How a refusal reaches the process

Three failures are possible: the connection service is missing, the webServer bind host cannot be read, the host is not loopback, or one of the three auth methods is no longer a function. Each one writes an explicit dsh-local-no-auth: refusing to start — … line to stderr naming the reason, requests a nonzero exit through the launcher's ctx.appExit, and then throws.

The ctx.appExit request is not decoration. Up to harness 0.1.5 a thrown apply aborted the whole boot; since 0.1.6-alpha.1 upstream is fatal only for a private list of required entries (agent-loop, webserver, modules, connection, headless-runner, acp, sdk-jsonrpc-server), so a plugin entry cannot abort the boot by throwing — it produces one generic warning: N entry did not activate line and the server serves anyway. The launcher's exit request is what restores a real nonzero exit; the throw is kept for older harnesses, where it still is fatal.

When auditing a running instance: if this plugin's entry fails to activate for any reason, dsh web still serves, with authentication intact. Confirm the bypass is actually installed by the [dsh-local-no-auth] active: line on stdout/stderr — not by the absence of a crash.

Install

# local development install (directory path is accepted):
pnpm dsh plugin --profile web add <absolute-path-to-this-directory>

# after publishing:
dsh plugin --profile web add github:falling-ts/dsh-local-no-auth

dsh web has no --patch CLI overlay; the plugin activates through the profile's own cordis.patch.yml referencing this package's dsh.bundle.patch layer. Restart dsh web afterwards.

Verify

curl -i http://127.0.0.1:<port>/          # 200 + index.html, no token needed
curl -i -X POST http://127.0.0.1:<port>/api/session/list \
  -H 'content-type: application/json' \
  -d '{"type":"client-request","rpcId":"probe","method":"session/list","payload":{}}'
# a business envelope arrives (2xx, result.ok true/false) — never 401

Uninstall

dsh plugin --profile web remove dsh-local-no-auth

Known limitations

• The bypass is process-wide: every plugin in the same composition sees unauthenticated /api. That is the point for a local dev box.
• Startup log line still says dsh web: http://... (clean URL) and, with --trusted-host LAN candidates, prints the LAN URL clean as well.