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Registering from the native client failed with `captcha_failed` while the
checkbox was green — a worse symptom than the one being fixed, because the
widget now looked fine and only the hub's own log said otherwise:
captcha solved on an unexpected host ''; allowed: ['localhost', 'meshbay', 'meshbay.org']
The previous commit assumed Google would report the host component of the
origin, so `app://meshbay` would come back as `meshbay` and could sit in
`allowed_hosts`. It does not. A solve Google cannot attribute to a domain
reports an **empty** hostname, and no allowlist entry can match that. An empty
entry is not the answer either: a blank in a TOML list is a typo far more
often than an intention, and `load_config` drops blanks for that reason —
`captcha.allow_unattributed_host` is a named flag instead, so the trade is
stated where it is made.
What it admits, plainly: every non-web client, not only ours. A file:// page
or somebody else's Electron application look identical from here. That is the
same bar the client's own origin would have been — main.js already records
that `app://meshbay` is not a credential — and it is a bar: the captcha still
has to be solved, per token, in something that can render it. What is given up
is the origin restriction for non-web clients, not the captcha. Off by
default, and a hub without the desktop client should leave it off.
The refusal now names which of the two it is, since they need different
answers: an unexpected host names the host, an unattributed one says to set
the flag.
docs/captcha.md §6 said `meshbay` was the value and told operators to add it;
it now records what was measured and why the guess was wrong. The packaged
example config carries the flag with the same warning.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014UtzVrzM7e2tG9fSpkR9ML
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Reported from the native client: the reCAPTCHA box renders
"ERROR for site owner: Invalid domain for site key". The web browser is fine.
It is not a client restriction, and the CSP was never what refused — the
script loads, which is why the widget appears at all to say so. reCAPTCHA
validates the hostname of the page the widget is rendered in against the
domain list on the site key, and the desktop client's interface ships inside
the package and is served from `app://meshbay` (main.js: `win.loadURL`). Not a
preference: file:// breaks ES modules and IndexedDB, and the hub must never
become the document origin. So the hostname Google sees is `meshbay`, it is
not on the key's list, and it never can be — the check runs on Google's
servers and nothing client-side reaches it.
The fix turns that check off on the key and does it on the hub instead:
[captcha]
allowed_hosts = ["meshbay.org", "localhost", "meshbay"]
`verify_captcha` refuses a solve whose hostname is not in the list. The
hostname comes from `siteverify` — what Google observed, not what the caller
asserts — so it is a real check against what turning the console setting off
opens, which is a bot rendering the public site key on a page of its own.
Empty (the default) skips it, so an existing hub upgrades unchanged with
reCAPTCHA still doing the origin check. The two settings go together, and
docs/captcha.md §6 says so.
The `meshbay` entry is the weak one and the doc says that too: any Electron
application can claim the same scheme and host, as main.js already records.
What it still costs is a captcha solve per token inside a real Chromium
instead of a token farmed from any web page.
docs/captcha.md §6 replaced. It documented a design that was superseded twice
— an `auth_key`-keyed carve-out that turned out to disable the gate for
everyone, and "works in the Electron client too, both run Chromium", which is
the assumption this bug is made of: reCAPTCHA validates the domain, not the
rendering engine.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014UtzVrzM7e2tG9fSpkR9ML
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Server-side verification module, CaptchaConfig in hub.toml,
captcha_site_key exposed via /v1/hub/info, useCaptcha() hook
in the SPA with stable DOM rendering (strength bar always present
to avoid Preact re-ordering the captcha widget). Native clients
(auth_key path) skip captcha. All 10 locales updated.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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