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ehealthid-relying-party

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OpenID Connect Relying Party for Germany's GesundheitsID (eHealthID)

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# OpenID Connect Relying Party for GesundheitsID (eHealthID)

The goal is to provide a simple standalone server exposing Germany's 'GesundheitsID' (eHealthID) as
a good old OpenID Connect Relying Party (OIDC RP).

Identity Providers such as Keycloak can link accounts with OIDC out-of-the-box

## State of Compatibility

### Productive Environment (PU)

In short:

- `IBM/Verimi` works well
- `Bitmarck/RISE` somewhat works

## Authentication Flow IDP / Relying Party

```mermaid
sequenceDiagram
    participant app as Mobile App
    participant idp as Your IDP
    participant rp as Relying Party
    app ->> idp: login
    idp -->> app: redirect to Relying Party (OIDC)
    app ->> rp: login
    note over app, rp: login via eHealthID handled by Relying Party (RP)
    rp -->> app: redirect to IDP with code
    app ->> idp: success, callback to IDP
    idp ->> rp: redeem code
    rp -->> idp: id_token
    idp -->> app: success! redirect
```

## Contents

- [ehealthid-rp](./ehealthid-rp) - A standalone application to act as a OpenID Connect (OIDC)
  Relying Party. Bridges OIDC and Germany's GesundheitsID OpenID federation.
- [ehealthid-cli](./ehealthid-cli) - A script to generate keys and federation (de-)registration forms.
- [ehealthid](./ehealthid) - A plain Java library to build RelyingParties for GesundheitsID.
    - API clients
    - Models for the EntityStatments, IDP list endpoints etc.
    - Narrow support for the 'Fachdienst' use-case.

# Quickstart

```shell

#---- 1. generate keys
# the URI where your relying-party will run, 
# for the registration this _MUST_ be publicly reachable
export ISSUER_URI=https://mydiga.example.com

# generate keys for the application, keep those safe and secure
./cli.sh keygen --issuer-uri=$ISSUER_URI

#---- 2. deploy the relying party
docker run --rm \
    -v "$(pwd)"/sig_mydiga_example_com_jwks.json:/secrets/sig_jwks.json:ro \
    -e "EHEALTHID_RP_APP_NAME=Awesome DiGA" \
    -e "EHEALTHID_RP_BASE_URI=$ISSUER_URI" \
    -e 'EHEALTHID_RP_FEDERATION_ES_JWKS_PATH=/secrets/sig_jwks.json' \
    -e 'EHEALTHID_RP_FEDERATION_MASTER=https://app-test.federationmaster.de' \
    -e 'EHEALTHID_RP_REDIRECT_URIS=https://sso-mydiga.example.com/auth/callback' \
    -e 'EHEALTHID_RP_ES_TTL=PT5M' \
    -e 'EHEALTHID_RP_IDP_DISCOVERY_URI=https://sso-mydiga.example.com/.well-known/openid-configuration' \
    -p 1234:1234 \
    ghcr.io/oviva-ag/ehealthid-relying-party:latest

#---- 3. register with the federation master

# a string received from Gematik as part of the registration process
# see: https://wiki.gematik.de/pages/viewpage.action?pageId=544316583
export MEMBER_ID=FDmyDiGa0112TU

# generate the registration XML from an existing entity statement
./cli.sh fedreg \
    --environment=TU \
    --contact-email=bobby.tables@example.com \
    --issuer-uri=$ISSUER_URI \
    --member-id="$MEMBER_ID"
    
# this prints the XML for registration in the federation, send it
# as an email attachment to Gematik 
# see: https://wiki.gematik.de/pages/viewpage.action?pageId=544316583

#---- Once you no longer need it, it needs to be deregistered

./cli.sh feddereg \
    --environment=TU \
    --issuer-uri=$ISSUER_URI \
    --member-id="$MEMBER_ID"
# see also: https://wiki.gematik.de/pages/viewpage.action?pageId=544316583
```

**IMPORTANT:**

- The relying party __MUST__
  be [registered within the OpenID federation](https://wiki.gematik.de/pages/viewpage.action?pageId=544316583)
  to work fully.
- In order to register for the federation, your entity statment __MUST__ be publicly available.

Once the server is booted, it will:

1. Expose an OpenID Discovery document at `$EHEALTHID_RP_BASE_URI/.well-known/openid-configuration`
   ```shell
    curl $BASE_URI/.well-known/openid-configuration | jq .
    ```

2. Expose an OpenID Federation entity configuration
   at `$EHEALTHID_RP_BASE_URI/.well-known/openid-federation`
   ```shell
    curl $BASE_URI/.well-known/openid-federation | jwt decode -j - | jq .payload
    ```

3. Be ready to handle OpenID Connect flows and handle them via Germany's GesundheitsID federation.

## Configure Identity Provider

Generic settings:

- the relying party OpenID configuration is at `$ISSUER_URI/.well-known/openid-configuration`
    - token_url: `/auth/token`
    - auth_url: `/auth`
    - jwks_url: `/jwks.json`
- the only supported client authentication is `private_key_jwt`, the public keys will be discovered

## Example: Keycloak OpenID Connect Identity Provider Settings

As an example with `https://t.oviva.io` as the relying party issuer.
![](https://raw.githubusercontent.com/oviva-ag/ehealthid-relying-party/main/keycloak_config.png)

# Configuration

Use environment variables to configure the relying party server.

(*) required configuration

| Name                                         | Description                                                                                                                                                                | Example                                                           |
|----------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------|
| `EHEALTHID_RP_FEDERATION_ES_JWKS_PATH`*      | Path to a JWKS with at least one keypair for signature of the entity statement. All these keys __MUST__ be registered with the federation master.                          | `./sig_jwks.json`                                                 |
| `EHEALTHID_RP_OPENID_RP_SIG_JWKS_PATH`*      | Path to a JWKS with signing keys of our relying party, i.e. for mTLS client certificates                                                                                   | `./openid_rp_sig_jwks.json`                                       | 
| `EHEALTHID_RP_OPENID_RP_ENC_JWKS_PATH`*      | Path to a JWKS with the keys used for encryption between the federation and the relying party, i.e. to encrypt id_tokens                                                   | `./openid_rp_enc_jwks.json`                                       |
| `EHEALTHID_RP_REDIRECT_URIS`*                | Valid redirection URIs for OpenID connect.                                                                                                                                 | `https://sso-mydiga.example.com/auth/callback`                    |
| `EHEALTHID_RP_BASE_URI`*                     | The external base URI of the relying party. This is also the `issuer` towards the OpenID federation. Additional paths are unsupported for now.                             | `https://mydiga-rp.example.com`                                   |
| `EHEALTHID_RP_IDP_DISCOVERY_URI`*            | The URI of the discovery document of your identity provider. Used to fetch public keys for client authentication.                                                          | `https://sso-mydiga.example.com/.well-known/openid-configuration` |
| `EHEALTHID_RP_FEDERATION_MASTER`*            | The URI of the federation master.                                                                                                                                          | `https://app-test.federationmaster.de`                            |
| `EHEALTHID_RP_APP_NAME`*                     | The application name within the federation.                                                                                                                                | `Awesome DiGA`                                                    |
| `EHEALTHID_RP_HOST`                          | Host to bind to.                                                                                                                                                           | `0.0.0.0`                                                         |
| `EHEALTHID_RP_PORT`                          | Port to bind to.                                                                                                                                                           | `1234`                                                            |
| `EHEALTHID_RP_ES_TTL`                        | The time to live for the entity statement. In ISO8601 format.                                                                                                              | `PT12H`                                                           |
| `EHEALTHID_RP_SCOPES`                        | The comma separated list of scopes requested in the federation. This __MUST__ match what was registered with the federation master.                                        | `openid,urn:telematik:versicherter`                               |
| `EHEALTHID_RP_SESSION_STORE_TTL`             | The time to live for sessions. In ISO8601 format.                                                                                                                          | `PT20M`                                                           |
| `EHEALTHID_RP_SESSION_STORE_MAX_ENTRIES`     | The maximum number of sessions to store. Keeps memory bounded.                                                                                                             | `1000`                                                            |
| `EHEALTHID_RP_CODE_STORE_TTL`                | The time to live for codes, i.e. successful logins where the code is not redeemed yet. In ISO8601 format.                                                                  | `PT5M`                                                            |
| `EHEALTHID_RP_CODE_STORE_MAX_ENTRIES`        | The maximum number of codes to store. Keeps memory bounded.                                                                                                                | `1000`                                                            |
| `EHEALTHID_RP_LOG_LEVEL`                     | The log level.                                                                                                                                                             | `INFO`                                                            |
| `EHEALTHID_RP_OPENID_PROVIDER_SIG_JWKS_PATH` | Path to a JWKS with signing keys for our openIdProvider, for example the id_token issued by the relying party will be signed with it. Will be generated if not configured. | `./openid_provider_sig_jwks.json`                                 |

# Generate Keys & Register for Federation

In order to participate in the GesundheitsID one needs to register the entity statement of the IDP
or in this case the relying party here.

To simplify matter, here a script to generate fresh keys as well as the XML necessary to register
with Gematik.

See [Gematik documentation](https://wiki.gematik.de/pages/viewpage.action?pageId=544316583) for
details on the registration process.

```shell
./cli.sh --help
```

## Authentication flow between all involved parties

**NOTE:** There are some additional interactions within the federation, for a more complete flow see
[AppFlow](https://wiki.gematik.de/display/IDPKB/App-App+Flow#AppAppFlow-0-FederationMaster) in the
Gematik documentation.

```mermaid
sequenceDiagram
    participant app as Mobile App
    participant idp as Your IDP
    participant rp as Relying Party
    participant secIdp as Sectoral IDP
    participant fedmaster as Federation Master
    app ->> idp: login
    idp -->> app: redirect to Relying Party (OIDC)
    app ->> rp: login
    alt relying party & eHealthID federation
        rp ->> fedmaster: fetch list of sectoral IDPs
        fedmaster -->> rp: list of sectoral IDPs
        rp -->> app: show list of IDPs to select from
        app ->> rp: select an IDP
        rp ->> secIdp: get redirect url (PAR)
        secIdp -->> rp: redirect_uri
        rp -->> app: redirect to sectoral authentication (e.g. ident app)
        alt proprietary flow
            app ->> secIdp: authenticate
            secIdp ->> app: success, redirect to relying party
        end
        app ->> rp: success, callback to relying party
        rp ->> secIdp: fetch id_token
        secIdp -->> rp: id_token
    end
    rp -->> app: redirect to IDP with code
    app ->> idp: success, callback to IDP
    idp ->> rp: redeem code
    alt client authentication
        note right of rp: client authenticated via 'private_key_jwt'
        rp ->> idp: fetch OpenID discovery document
        idp -->> rp: discovery document
        rp ->> idp: fetch JWKS
        idp -->> rp: JWKS
        note right of rp: verifies client JWT with discovered JWKS
    end
    rp -->> idp: id_token
    idp -->> app: success! redirect
```

# Testing

**See [TESTING](./TESTING.md).**

# Limitations

- for now sessions are stored in-memory, this implies:
    - rebooting the server will force users currently logging-in to restart
    - if multiple instances run, sessions must be sticky (e.g. use `session_id` cookie)
    - though it would be relatively straight forward to use a database instead
- this is tested in the 'Testumgebung' (TU) against the Gematik IDP due to a lack of other options

# Open Points

- end-to-end tests with Verimi, Gematik, RISE and IBM IDPs, most lack options to test currently

# Wishlist

- Accept base URI's with paths.
- MySQL or Postgres backed session and code repos
- PKCE flow on OIDC side
- Integration with other IDPs such as [FusionAuth](https://fusionauth.io/)

# Helpful Links

- [OpenID Federation Spec](https://openid.net/specs/openid-federation-1_0.html)
- [Gematik Fachdienst Specifications](https://gemspec.gematik.de/docs/gemSpec/gemSpec_IDP_FD/latest/)
- [Gematik Fedmaster Specification](https://gemspec.gematik.de/docs/gemSpec/gemSpec_IDP_FedMaster/latest/)
- [Gematik Sectoral IDP Specifications](https://gemspec.gematik.de/docs/gemSpec/gemSpec_IDP_Sek/latest/)
- [AppFlow - Authentication flow to implement](https://wiki.gematik.de/display/IDPKB/App-App+Flow#AppAppFlow-0-FederationMaster)
- [Sektoraler IDP - Examples & Reference Implementation](https://wiki.gematik.de/display/IDPKB/Sektoraler+IDP+-+Referenzimplementierung+und+Beispiele)

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