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Consolidate SSO redirects through `/_matrix/client/v3/login/sso/redirect(/{idpId})` (#17972) Consolidate SSO redirects through `/_matrix/client/v3/login/sso/redirect(/{idpId})` Spawning from https://github.com/element-hq/sbg/pull/421#discussion_r1859497330 where we have a proxy that intercepts responses to `/_matrix/client/v3/login/sso/redirect(/{idpId})` in order to upgrade them to use OAuth 2.0 Pushed Authorization Requests (PAR). Instead of needing to intercept multiple endpoints that redirect to the authorization endpoint, it seems better to just have Synapse consolidate to a single flow. ### Testing strategy 1. Create a new OAuth application. I'll be using GitHub for example but there are [many options](https://github.com/matrix-org/synapse/blob/be65a8ec0195955c15fdb179c9158b187638e39a/docs/openid.md). Visit https://github.com/settings/developers -> **New OAuth App** - Application name: `Synapse local testing` - Homepage URL: `http://localhost:8008` - Authorization callback URL: `http://localhost:8008/_synapse/client/oidc/callback` 1. Update your Synapse `homeserver.yaml` ```yaml server_name: "my.synapse.server" public_baseurl: http://localhost:8008/ listeners: - port: 8008 bind_addresses: [ #'::1', '127.0.0.1' ] tls: false type: http x_forwarded: true resources: - names: [client, federation, metrics] compress: false # SSO login testing oidc_providers: - idp_id: github idp_name: Github idp_brand: "github" # optional: styling hint for clients discover: false issuer: "https://github.com/" client_id: "xxx" # TO BE FILLED client_secret: "xxx" # TO BE FILLED authorization_endpoint: "https://github.com/login/oauth/authorize" token_endpoint: "https://github.com/login/oauth/access_token" userinfo_endpoint: "https://api.github.com/user" scopes: ["read:user"] user_mapping_provider: config: subject_claim: "id" localpart_template: "{{ user.login }}" display_name_template: "{{ user.name }}" ``` 1. Start Synapse: `poetry run synapse_homeserver --config-path homeserver.yaml` 1. Visit `http://localhost:8008/_synapse/client/pick_idp?redirectUrl=http%3A%2F%2Fexample.com` 1. Choose GitHub 1. Notice that you're redirected to GitHub to sign in (`https://github.com/login/oauth/authorize?...`) Tested locally and works: 1. `http://localhost:8008/_synapse/client/pick_idp?idp=oidc-github&redirectUrl=http%3A//example.com` -> 1. `http://localhost:8008/_matrix/client/v3/login/sso/redirect/oidc-github?redirectUrl=http://example.com` -> 1. `https://github.com/login/oauth/authorize?response_type=code&client_id=xxx&redirect_uri=http%3A%2F%2Flocalhost%3A8008%2F_synapse%2Fclient%2Foidc%2Fcallback&scope=read%3Auser&state=xxx&nonce=xxx`

2024-11-29 20:26:37 +03:00

Consolidate SSO redirects through `/_matrix/client/v3/login/sso/redirect(/{idpId})`.