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
0e8ffa5444