Proposal for OpenID information exchange with widgets
Travis Ralston
6 years ago
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# MSC0000: OpenID information exchange for widgets
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With the various integrations API proposals, widgets are left with no options to verify the
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requesting user's ID if they need it. Widgets like the sticker picker must know who is making
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the request and as such need a way to get accurate information about who is contacting them.
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This proposal introduces a way for widgets (room and account) to do so over the `fromWidget`
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API proposed by [MSC1236](https://github.com/matrix-org/matrix-doc/issues/1236).
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## Proposal
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Room and account widgets may request a new OpenID object from the user so they can log in/register with
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the backing integration manager or other application. This is largely based on the prior art available
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[here (riot-web#7153)](https://github.com/vector-im/riot-web/issues/7153). The rationale for such an
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API is so that widgets can load things like a user's sticker packs or other information without having
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to rely on secret strings. For example, a room could be used to let a user create custom sticker packs
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via a common widget - it would be nice if that widget could auth the user without asking them to enter
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their username and password into an iframe.
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Widgets can request OpenID credentials from the user by sending a `fromWidget` action of `get_openid`
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to intiate the token exchange process. The client should respond with an acknowledgement of
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`{"state":"request"}` (or `{"state":"blocked"}` if the client/user doesn't think the widget is safe).
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The client should then prompt the user if the widget should be allowed to get details about the user,
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optionally providing a way for the user to always accept/deny the widget. If the user agrees, the
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client sends a `toWidget` action of `openid_credentials` with `data` holding the raw OpenID credentials
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object returned from the homeserver, and a `success: true` parameter. If the user denies the widget,
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just `success: false` is returned in the `data` property. To lessen the number of requests, a client may
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also respond to the original `get_openid` request with a `state` of `"allowed"`, `success: true`, and
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the OpenID object (just like in the data for `openid_credentials`). The widget should not request OpenID
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credentials until after it has exchanged capabilities with the client, however this is not required. The
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widget should acknowledge the `openid_credentials` request with an empty response object.
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A full sequence diagram for this flow is as follows:
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```
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+-------+ +---------+ +---------+
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| User | | Client | | Widget |
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+-------+ +---------+ +---------+
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| | Capabilities negotiation |
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| |<-----------------------------------------|
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| | Capabilities negotiation |
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| |----------------------------------------->|
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| | fromWidget get_openid request |
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| |<-----------------------------------------|
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| | ack with state "request" |
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| |----------------------------------------->|
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| Ask if the widget can have information | |
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|<--------------------------------------------| |
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| Approve | |
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|-------------------------------------------->| |
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| | toWidget openid_credentials request |
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| |----------------------------------------->|
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| | acknowledge request (empty response) |
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| |<-----------------------------------------|
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```
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Prior to this proposal, widgets could use an undocumented `scalar_token` parameter if the client chose to
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send it to the widget. Clients typically chose to send it if the widget's URL matched a whitelist for URLs
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the client trusts. Widgets are now not able to rely on this behaviour with this proposal, although clients
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may wish to still support it until adoption is complete. Widgets may wish to look into cookies and other
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storage techniques to avoid continously requesting credentials.
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A proof of concept for this system is demonstrated [here](https://github.com/matrix-org/matrix-react-sdk/pull/2781).
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The widget is left responsible for dealing with the OpenID object it receives, likely handing it off to
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the integration manager it is backed by to exchange it for a long-lived Bearer token.
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## Security considerations
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The user is explicitly kept in the loop to avoid automatic and silent harvesting of private information.
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Clients must ask the user for permission to send OpenID information to a widget, but may optionally allow
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the user to always allow/deny the widget access. Clients are encouraged to notify the user when future
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requests are automatically handled due to the user's prior selection (eg: an unobtrusive popup saying
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"hey, your sticker picker asked for your information. [Block future requests]").
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