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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](be65a8ec01/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`
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Consolidate SSO redirects through `/_matrix/client/v3/login/sso/redirect(/{idpId})`.
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