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1 Commits (4e562f240c7b8072ca7e3cfc486fb1920ca10d8d)
| Author | SHA1 | Message | Date |
|---|---|---|---|
tom27052006
|
83fd293e01 |
Add trusted device encryption for SSO logins
Lets a user unlock their vault after an SSO login with a key stored on a
trusted device instead of a master password, what Bitwarden calls trusted
device encryption. Off by default, enabled with
`SSO_TRUSTED_DEVICE_ENCRYPTION`, which requires `SSO_ENABLED`.
The client generates a key pair plus a device key that never leaves the
device and stores three blobs on the device row: the user key wrapped for
the device public key, that public key wrapped with the user key, and the
device private key wrapped with the device key. The server only keeps and
returns them, so a stored trust is worthless without the device itself.
A device counts as trusted only while all three are present.
Endpoints, matching bitwarden/server's DevicesController:
PUT|POST /devices/<identifier>/keys trust a device
POST /devices/<identifier>/retrieve-keys the public halves, for rotation
POST /devices/update-trust re-wrap after a key rotation
POST /devices/untrust drop the trust of some devices
POST /devices/lost-trust client reports a drifted trust
`GET /devices`, `GET /devices/identifier/<id>` and the login response now
report the real trust state instead of a hard-coded `isTrusted: false`.
An SSO login response carries `UserDecryptionOptions.TrustedDeviceOption`,
which is what makes the clients offer the flow at all. Upstream ties this to
the SSO configuration of an organization; SSO is configured for the whole
server here, so the setting decides it, and members of no organization can
use it too. A password login never gets these options. When the setting is
turned off again, devices that are still trusted keep receiving their keys
with `IsTdeOffboarding` set, so their owner can still unlock and set a
master password instead of being locked out.
`HasAdminApproval` and `HasManageResetPasswordPermission` are always false:
approval of a new device by an organization admin is not implemented, and
announcing it would leave the client waiting for a request nobody can
answer. A new device is unlocked by approving it from an already trusted
device or with the master password.
Two adjacent fixes this depends on:
- `POST /accounts/keys` refused to notice that an account already has a
key pair and would happily replace it, which makes every existing
cipher undecryptable. It now only accepts keys for an account that has
none, and tolerates a repeat of the same keys. The trusted device flow
is what makes this reachable in practice: a client that misjudges an
existing account as new posts a fresh key pair here.
- `POST /accounts/set-password` keyed "account already initialized" off
the key pair, so an account created without a master password could
never gain one. It now keys off the master password itself and refuses
to replace an existing key pair, which is what the check was guarding.
Rotating the account keys leaves every device holding a wrapped copy of the
previous user key. Those are dropped; the rotating device keeps its own
private key so its client can re-wrap the new user key right away via
`/devices/update-trust`. A client that skips that call ends up with no
trusted device rather than a broken unlock.
Covers dani-garcia/vaultwarden#7034.
|
2 weeks ago |