mirror of
https://github.com/screentinker/screentinker.git
synced 2026-08-14 06:16:20 -06:00
8 commits
| Author | SHA1 | Message | Date | |
|---|---|---|---|---|
ScreenTinker
|
983bee31b7 |
SSO-only: close the backdoor, the unilateral disable, and the fresh-install fail-open
Three HIGH findings from the QA round. Each was demonstrated end to end against a running server, and each is now refused there. ENFORCEMENT PROTECTED A DOMAIN, NOT AN ORGANIZATION ssoOnlyForEmail answers about an address's domain, so any account in the tenant at an outside address kept password login — a contractor, an MSP, the one address nobody remembered. And it could be manufactured: POST /api/admin/users accepts workspace_admin and creates a LOCAL password account at any address bound to that workspace. A review created backdoor@notacme.test, logged in with the password, landed in the SSO-only org, and used it to create another. Enforcement is now keyed on MEMBERSHIP as well as domain (ssoOnlyForUser), and that route refuses to mint password accounts into an SSO-only organization at all. platform_admin keeps both, as the operator break-glass. THE APPROVAL WORKFLOW WAS DECORATIVE `sso_only` is honoured only while a provider is enabled and a domain is verified, so `PUT {enabled:false}`, `PUT {email_domains:""}` and `DELETE` each switched enforcement off — with sso_only still reading true, no request filed and the operator never told. The delete variant additionally rewrites every federated account to `local`, after which a password reset takes over accounts the identity provider was supposed to own. Anyone who could file a request could simply turn the provider off instead. All three now refuse with sso_only_locked when nothing else would still enforce, and say to ask for approval. FRESH INSTALLS FAILED THE MIGRATION AND FAILED OPEN The ALTER adding organizations.sso_only sat in the column-migration array, which runs BEFORE the multi-tenancy migration that creates the table: `[migrate] FAILED … no such table: organizations`, one line among ~85. The instance then ran its whole first boot with the SSO settings screen 500ing and ssoOnlyForEmail catching `no such column` and answering "not required" — password login proceeding for an organization that had switched it off. It self-healed on the second boot, which is what made it easy to miss. The column is now added after the table exists, and the catch distinguishes "this instance has no per-org SSO" (null, so single-tenant installs keep working) from drift on a table that DOES exist (throw). Login treats an undeterminable answer as "required" rather than letting a 500 escape or letting the login through. Verified live, all four refused with enforcement intact and the operator still able to sign in. 1609 tests pass. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A |
||
|
ScreenTinker
|
0e8ffa5444 |
SSO-only: an org may require its own identity provider, operator approves removal
Per-organization toggle. Enabling is the safe direction and an org admin does it
alone; turning it back off is a REQUEST that a platform admin has to approve, because
that is the direction that re-opens password sign-in — the direction a compromised
admin would take, and the one a customer will demand at their worst moment with the
IdP down.
- requires at least one VERIFIED domain, so nobody can lock a company out of a
domain they only typed, and an org cannot leave its own people with no way in
- the login page HIDES the password field for those domains rather than letting
someone type a password that will be refused and then go reset it
- the refusal is `sso_required`, distinguishable from a wrong password
- the approval email carries NO action link: a token that acts on its own turns
every forwarded copy into a way to switch off a customer's SSO. The decision is
made signed in as a platform admin.
INSTANCE PROVIDERS WERE A SIDE DOOR
Blocking passwords while leaving "Continue with Google" is not requiring single
sign-on, it is renaming the bypass — instance-wide providers are the operator's and
are NOT domain-confined, so one could assert an address at an SSO-only domain and walk
straight past the customer's MFA and deprovisioning. The callback now refuses any
provider other than that organization's own, and the page stops offering them.
Instance-wide stays the default everywhere else: an address whose domain has no org
SSO still gets local plus every configured instance provider. The org only overrides
for its own verified domains.
PLATFORM_ADMIN IS EXEMPT, DELIBERATELY
The operator approves turning this off. If the operator's own address sat at an
SSO-only domain and that IdP broke, nobody could sign in to approve anything and the
instance would be bricked. The exemption is the break-glass, and a test pins it as
source so it is not "tidied away" as a convenience.
BROWSER-FOUND
Hiding the password by hiding its .form-group also hid the organization SSO button,
which lives inside that same group — leaving a login page whose only action was
"Create Account". Only visible by looking at a screenshot. Hides the field now, not
the container.
Player untouched: this branch changes no device, WebSocket or provisioning file, and
the 358 device/player/socket/pairing tests pass.
1603 tests pass. Enforcement, the approval workflow and the login page verified in
real Chrome.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A
|
||
|
ScreenTinker
|
c91b96ab91 |
SSO: refuse delegated proof names, release lapsed and deleted claims
Third review pass. It confirmed the crash wrapper holds (~13,000 hostile requests,
no fourth crash), the SSRF rewrite holds (77 vectors, every CIDR boundary proven),
the rate-limiter rewrite closed the login brute-force bypass, and /sso/claim rejects
every wrong token kind. It also found that two things I built yesterday did not do
what they claimed.
THE 8-HOUR LIMIT DID NOT BOUND SQUATTING
Pressing Verify on an expired claim REISSUED it in place, renewing the clock — so one
request per window held a domain forever, through the endpoint meant to enforce the
limit. Worse, a renewal was not a new claim, so the operator was notified exactly once,
on day zero: a tenant could sit on a company's domain for a year off a single stale
alert. A lapsed claim is now RELEASED. Re-adding it is an ordinary new claim: new
token, and the operator is told again. Squatting is not impossible; it is loud.
A DELEGATED PROOF NAME COULD FORGE A DOMAIN
A TXT lookup follows CNAMEs, and RFC 4592 means a wildcard `*.victim.com` synthesizes
`_screentinker-verify.victim.com` too — so a wildcard CNAME let whoever controls its
target prove a domain they do not own, turning an ordinary subdomain takeover into
every `@victim.com` login. A reviewer did this against a real authoritative zone. The
proof name is now refused if it is a CNAME, which is stricter than ACME's dns-01, and
the comment that claimed wildcards "cannot be mistaken for a proof" — true only for
wildcard TXT — has been corrected.
MY VERIFY BUTTON REPORTED FAILURE ON SUCCESS
`await load()` — the loader is `loadSso()`. The ReferenceError went into a bare catch,
so a correct DNS proof showed "Could not verify that domain" and left the card stale.
On the expired branch the admin kept publishing a token the server had already rotated.
ALSO FIXED
- deleting a provider stranded its verified domains (no FK, UNIQUE, never expires) so
the domain was blocked for EVERY org forever with no in-product recovery, and its
users could neither sign in nor reset. Delete now releases the domains and returns
the accounts to local, in one transaction; a cascade FK backstops it.
- isOrphanedFederated read absence-of-config as proof-of-deletion, so unsetting
GOOGLE_CLIENT_ID made every Google account password-resettable instance-wide, and
irreversibly. Restricted to org-provider slugs.
- `email_domains: null` (not undefined) took the destructive branch and deleted every
DNS proof an organization had.
- unbounded domain lists: 400 domains sent 401 emails; now capped at 50, one digest
per save, and /api/organizations is rate-limited at all for the first time.
- login and register responses carried password_reset_hash and email_verify_hash —
live account-takeover credentials handed to the browser. One sanitiser now.
- trailing-dot hostname (`https://localhost./`) slipped the SSRF guard.
- asyncRoute's own catch could throw and kill the process it exists to protect.
- a legacy DB whose typed domains were never verified now says so LOUDLY at boot
instead of silently locking every federated user out.
TESTS
Two of the previous round's tests passed against the code they were named after: one
asserted UNIQUE against the test harness's own CREATE TABLE rather than the shipped
schema, the other used two different domains so no ordering was exercised. Both
replaced and confirmed load-bearing. Seven mutations now turn the suite red, including
removing the CNAME refusal, the verified_at filter, and the expiry itself.
1598 tests pass. Delete-release, lapse-release and the leak fix verified against a
running server.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A
|
||
|
ScreenTinker
|
9155370ae8 |
SSO: TXT only for domain proof, drop the CNAME form
The CNAME alternative pointed at `<token>.verify.screentinker.com`. Making that work means operating a wildcard DNS zone that answers for every token ever issued — which this project does not have, so half the published instructions described a check that could never pass. Documenting a verification path that cannot succeed is worse than offering one form. TXT needs nothing outside the customer's own zone, and the dedicated `_`-prefixed name keeps it away from the apex where SPF and DMARC live. A wildcard `*.example.com` cannot be mistaken for a proof either way: it answers with its own value, never the token, so it lands in "exists but does not match". Also simplifies check() — one lookup, no Promise.allSettled, and NXDOMAIN is reported as "not published yet" rather than as an error. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A |
||
|
ScreenTinker
|
d4b8d7dad4 |
SSO: prove domain ownership by DNS, and fix what the second review found
A second review pass, run against the previous commit, found four blockers — two of
them introduced by the fixes in that commit. It also confirmed the original account
takeover is closed: a hostile IdP with real TLS, discovery, JWKS and RS256 driving the
real routers now stops at domain_not_allowed, and all 16 bypass variants are refused.
DOMAIN OWNERSHIP (the root cause, not the symptom)
A claimed domain used to mean "nobody else claimed it". It now means the organization
published a record in that domain's own DNS — TXT or CNAME, at a dedicated
_screentinker-verify name rather than the apex, where an edit would sit beside SPF.
- an unverified domain routes NOBODY and cannot be asserted; it reserves the name
- an unverified claim LAPSES after 8 hours, so a domain cannot be held against its
real owner, and lapsing rotates the token so a record left over from an abandoned
attempt cannot satisfy a later claim
- a verified domain never expires — re-proving on a timer would log a customer out
over a DNS edit made months later
- routing and confinement read the VERIFIED set only, never the typed column
- configuring SSO now requires a verified email address
- platform admins are emailed when a domain is claimed; nothing is ever sent to the
claimed domain, which would let any tenant make this product email third parties
Instance-wide providers are exempt from all of it: they are the operator's own
configuration and keep the trust they have always had.
BLOCKERS FROM THE REVIEW
- two unauthenticated remote crashes, both one request, both "async handler throws
before its try": `Cookie: st_oidc_tx=%` (unguarded decodeURIComponent) and the
fail-closed secret added last commit, which turned a JWT_SECRET rotation into a
permanent crash loop. Fixed the CLASS with asyncRoute() rather than the instances.
- the SSRF guard was bypassable via IPv4-mapped IPv6 ([::ffff:127.0.0.1]) and also
refused every host beginning "fc"/"fd" (fcm.googleapis.com). Addresses are now
parsed and compared by RANGE. 42 cases verified.
- the takeover fix had NO test — the test named after it asserted two struct fields
and passed with the guard deleted. The decision is now a pure function and four
mutations were confirmed to turn the suite red.
- the PUT path never received the TOCTOU fix, so two orgs could end up holding one
domain and forEmail handed routing to the attacker's older row.
ALSO
- linking compared slugs, so an org could never rotate its own IdP, and fell open on
an empty auth_provider. It now asks which ORGANIZATION owns the slug.
- an account stranded by a deleted provider can be reclaimed by password reset —
proof of the mailbox, which is stronger than the IdP assertion that created it.
- /sso/claim accepted a pre-TOTP mfa_pending token and returned the full user row;
it now takes a purpose-built 120s claim token with a pinned algorithm and typ.
- the rate limiter keyed on a caller-controlled path, so a trailing slash bought a
fresh bucket — a real login brute-force bypass.
- domain_not_allowed and account_exists_other_provider rendered as "please try
again", advice that can never work.
- malformed asserted addresses are refused rather than trimmed into shape.
- dead config (microsoftTenantId defaulted to 'common', which the provider code now
refuses) and the orphaned google-auth-library dependency removed.
1591 tests pass. Domain lifecycle verified end to end against a running server.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A
|
||
|
ScreenTinker
|
d26aaebef6 |
SSO: fix an account takeover, a remote crash, and login CSRF found in review
Five reviewers went at the two SSO commits. Three of them independently
demonstrated a full account takeover, and it was the same defect each time.
TAKEOVER. An org admin supplies the issuer and client_id, so they control that
identity provider completely and can mint an id_token asserting ANY email with
email_verified:true — including a platform_admin's. Every cryptographic check
passed honestly, because the attacker IS the issuer. upsertFederatedUser then
re-pointed the existing account at whichever provider spoke last, because the
only guard was `password_hash IS NULL` — and every SSO-created account has a
null password. Sessions were issued as the victim, and the victim's own login
then failed forever with subject_mismatch.
The rule came from the old Google handler, where it was safe: only the operator
could add a provider. Making providers customer-configurable turned it into a
takeover primitive and the assumption was not re-examined. Now an org provider
may only assert emails inside the domains it registered, and may never adopt an
account another provider established.
REMOTE CRASH, unauthenticated. The state comparison guarded on UTF-16 character
length while Buffer.from produces UTF-8 bytes, so a state of 43 characters
containing one multi-byte character reached timingSafeEqual with mismatched
buffers and threw — inside an async handler, which Express does not catch, which
server.js turns into process.exit. One request per restart killed any instance
with SSO enabled. Compared as bytes now, and /api/auth/oidc gained a rate limit.
LOGIN CSRF. The callback returned the session token in the URL fragment, so a
crafted link installed an ATTACKER'S token and silently signed the victim into
their account. The token now goes in a one-shot httpOnly cookie exchanged at
POST /sso/claim, which a link cannot forge.
FRONTEND, dead on arrival twice over. login.js used `await` in a non-async
function — a SyntaxError that takes the WHOLE app down, since app.js imports it
statically and there is no bundler. And `esc` was never imported, so the org-SSO
button could never render; the ReferenceError was swallowed by the catch written
for network failures. Both slipped through because `node --check` parses these
files as CommonJS and exits 0 on a broken module. The correct check is
`node --input-type=module --check`, and all four frontend files now pass it.
PUBLIC EMAIL DOMAINS cannot be claimed. A tenant had claimed gmail.com in
review, after which every Gmail user typing their address was offered "sign in
with your organization" pointing at that tenant's infrastructure — phishing from
this product's own login page. server/lib/public-email-domains.js.
MICROSOFT multi-tenant is refused rather than silently broken. `common` metadata
advertises the literal template {tenantid}, so the issuer never matches and
every login already failed; and loosening that check is nOAuth. A tenant GUID is
now required, with a loud warning at boot.
SSRF: https only, loopback/RFC1918/link-local refused, redirects not followed,
and the test endpoint no longer echoes upstream status for a caller-supplied
jwks_uri (it was a readable internal port scanner).
Also: an omitted email_verified was accepted (the comment already said it should
not be); the domain-uniqueness check raced an 8s network call before its insert
and is now inside the transaction; same-org duplicate domains were allowed and
made routing depend on table-scan order; routing is now ordered; a client secret
that cannot be decrypted fails closed instead of silently downgrading to a public
client; SSO audit rows were writing the org id into the deviceId column; and
/sso/start was capped at 10/min per IP, which would 429 the 11th employee behind
a corporate NAT.
Adds per-provider editing in the org admin UI (replace-only secrets — never
returned, blank means keep, explicit clear) and a Test button that checks
discovery, endpoints and signing keys while stating plainly that it cannot
verify the client ID, the secret, or the redirect URI registration.
⚠️ STILL MISSING: domain-ownership verification. A claimed domain means "nobody
else had claimed it", not "they own it". DNS TXT proof is the remaining control.
1582 tests pass. New regression tests cover the takeover confinement, ordering,
fail-closed secrets, the Microsoft refusal and the public-domain blocklist.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A
|
||
|
ScreenTinker
|
e97228a502 |
SSO: per-organization providers, configured by the customer
Instance-wide providers belong to whoever runs the server. These belong to a CUSTOMER: an organization points ScreenTinker at its own identity provider from Settings → Single sign-on, with no environment variable and no restart. The login flow is unchanged. An org provider is resolved through the same oidc-providers.get(slug) the env ones go through, so there is one authorization request builder, one token exchange and one verifier — not a second, less tested path for tenants. That seam is why Phase 1 put provider lookup behind a single function. ⚠️ An org provider is NEVER published. It is not in /api/auth/providers, because listing a customer's IdP would both offer it to people it does not belong to and leak the customer list from the login page. It surfaces only when someone types an address at one of that organization's domains; otherwise the instance-wide buttons are what you get. The discovery endpoint answers with a BOOLEAN and nothing else — no slug, no display name. Returning "yes, Acme Corp SSO" would turn a guessed domain into confirmation that Acme buys this product, and the slug would hand out a working entry point to their tenant. POST /sso/start repeats the lookup server-side and redirects, so the browser never learns which provider it is being sent to until the provider says so, and the address travels in a body rather than in a URL that lands in history, proxy logs and a Referer. Both endpoints rate limited to 10/min. Other properties, each with a test: - slugs are RANDOM, not chosen, so two customers cannot collide on or guess each other's URL - a domain may be claimed by ONE organization; a second claim is refused, so a tenant cannot capture another company's logins - the issuer is verified by live discovery BEFORE the row is written, so a typo is caught at configuration rather than by a user staring at a failed login - client secrets are optional (PKCE), stored AES-256-GCM via lib/secretbox, never returned; an absent secret on update leaves the stored one alone, which is how a settings form that cannot show it avoids blanking it - cross-org access answers 404, not 403, so an outsider cannot confirm that an organization id exists - signing in through an org provider grants membership of that organization, but never changes an existing member's role Verified live end to end: creation against a real issuer, domain normalisation (`@Acme.CO.UK` → `acme.co.uk`), boolean-only discovery, a rejected domain squat, a rejected bad issuer, and 404 for a foreign organization. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A |
||
|
ScreenTinker
|
252854d31e |
SSO: one OIDC flow for every provider, and verify the token properly
The OAuth support that was here could not work and would not have been safe if it had. It could not work: the login page called google.accounts.oauth2 and new msal.PublicClientApplication, and NEITHER SDK WAS EVER LOADED by any page in this app — no script tag, no dynamic import, nothing. Both buttons threw ReferenceError on click. Even had they loaded, the CSP allows scripts only from 'self' and cloudflareinsights, and frames only from self and YouTube, so the libraries and their popups were blocked too. It would not have been safe: both endpoints authenticated with an ACCESS token and neither checked who it was issued for. POST /auth/google fell back to tokeninfo?access_token= and read the email out of the reply; POST /auth/microsoft handed the bearer token to Graph /me and trusted that. Graph and tokeninfo will both describe the user behind a token minted for SOMEBODY ELSE'S application, so any site a user signed into that requested `email` or `User.Read` could have replayed their token here and been issued a session as them. Both endpoints are deleted; nothing is lost, because nothing could reach them. Replaced by ONE generic flow — Authorization Code + PKCE (S256), run server-side, with the provider list resolved through a single function so per-organization SSO can extend it later without a second login path. Google and Microsoft become ordinary configured providers; Okta, Keycloak, Authentik, Auth0 and anything else that speaks OIDC now work with three env vars. Because the exchange happens server-side the browser never talks to the provider, so there is no SDK to load, no client id in the page, and no third-party origin needed in the CSP. Identity comes from an ID token that must survive: signature against the provider's JWKS (asymmetric algorithms only — alg:none and HMAC are refused outright, the latter because the only key we hold is public), `iss` exactly as discovered, `aud` and `azp` matching our client, `exp`, and a `nonce` this server minted for that login. State is compared in constant time against a value in an httpOnly SameSite=Lax cookie, so the callback is CSRF-protected and survives a restart mid-login. Account rules are the ones already in place: a verified email is required, an SSO login never takes over an account that has a password, and a changed `sub` for a known address is refused rather than handing the account to a recycled mailbox. 18 new tests, every one describing something the old code would have accepted: cross-audience tokens, azp mismatch, replayed nonces, alg:none, HMAC forgery, wrong signing key, expired tokens, a discovery document lying about its issuer, and a registry that never leaks a client id or secret to the browser. Verified end to end against Google's real discovery document: the redirect carries response_type=code, PKCE S256, state and nonce, and every callback guard rejects as intended (no cookie, wrong state, no code, provider refusal, unknown provider). ⚠️ TOTP is still not prompted on an SSO login, matching the documented behaviour of the previous SSO and API-token paths. That is a product decision and is left unchanged here rather than altered silently. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Bvjey4FNam49MN7ybjcq6A |