Plan B Provider

This is a minimalistic OpenID Connect Provider that mainly supports the Resource Owner Password Credentials Grant to issue JWTs for Service to Service authentication.

More information is available in our Plan B Documentation.

Building

Building the artifact and running all tests:

$ ./mvnw verify

Find the executable jar in the target directory. Building a Docker image with the above artifact:

$ sudo pip3 install scm-source
$ scm-source
$ docker build -t planb-provider .

Code Generation

Java interfaces and classes for some REST APIs are auto-generated on build by swagger-codegen-maven-plugin. Find the generated sources in target/generated-sources/swagger-codegen/.

Setting up Local Dev Environment

Setup a local Cassandra

$ ./setup-dev-cassandra.sh

Afterwards you can access the Cassandra command line client via Docker, e.g.:

$ docker exec -it planb-provider-cassandra cqlsh
cqlsh> DESCRIBE KEYSPACE provider;

Set up the following environment variables

$ export OAUTH2_ACCESS_TOKENS=customerLogin=test             # fixed OAuth test token (unused)
$ export TOKENINFO_URL=https://example.com/oauth2/tokeninfo  # required for /raw-sync REST API (unused here)

Run the application against your local Cassandra

$ java -jar target/planb-provider-1.0-SNAPSHOT.jar --cassandra.contactPoints="127.0.0.1"

Testing the Endpoints

Requesting a new JWT via Resource Owner Password Grant (using the example credentials inserted into Cassandra above):

$ curl --silent -X POST -u test0:test0 -d "grant_type=password&username=test0&password=test0&scope=uid" \
     "http://localhost:8080/oauth2/access_token?realm=/services" | jq .

When requesting a new token via Implicit Flow, client will redirect user agent to the authorize endpoint. To test this, open the following link in your browser:

http://localhost:8080/oauth2/authorize?redirect_uri=http://localhost:8080/callback&scope=uid&response_type=token&realm=/services&client_id=test1

Introducing credentials test0/test0 will redirect to the consent page. After accepting these, your agent should be redirected with the token as a parameter in the url, which should look like this:

http://localhost:8080/callback?access_token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ&token_type=Bearer&expires_in=28800&scope=uid&state=

The Authorization Code Grant flow is similar to the implicit flow, but we would be getting an authorization code instead of a token. To test this, open the following link in your browser:

http://localhost:8080/oauth2/authorize?redirect_uri=http://localhost:8080/callback&scope=uid&response_type=code&realm=/services&client_id=test1

After login and accepting the consents, you will be redirected to the callback with a authorization code as parameter:

`http://localhost:8080/callback?code=ppdq9pjyaGxAF2YXXBnjOE9Hm4Dt-kXq&state=<http://localhost:8080/callback?code=ppdq9pjyaGxAF2YXXBnjOE9Hm4Dt-kXq&state=>`_

Redeeming the code for a token can be done as follows:

$ curl --silent -X POST -d 'redirect_uri=http://localhost:8080/callback&code=<CODE_FROM_PREVIOUS_REQUEST>&grant_type=authorization_code&client_id=test1&client_secret=test1' "http://localhost:8080/oauth2/access_token" | jq .

Get the OpenID Connect configuration discovery document:

$ curl --silent http://localhost:8080/.well-known/openid-configuration | jq .

Retrieving all public keys (set of JWKs) for verification:

$ curl --silent http://localhost:8080/oauth2/connect/keys | jq .

Generating JWT Signing Keys

Use OpenSSL to generate JWT signing keys.

$ openssl genrsa -out test-rs256-2048.pem 2048
$ openssl ecparam -genkey -out test-es256-prime256v1.pem -name prime256v1
$ openssl ecparam -genkey -out test-es384-secp384r1.pem -name secp384r1
$ openssl ecparam -genkey -out test-es512-secp521r1.pem -name secp521r1

The resulting PEM file's contents must be stored in the private_key_pem column of the provider.keypair Cassandra table.

Configuration

TOKENINFO_URL

OAuth2 token info URL (can point to Plan B Token Info), this is used to secure the /raw-sync/ REST endpoints.

CUSTOMER_REALM_SERVICE_URL

Optional URL to Zalando customer service WSDL.

ACCESS_TOKEN_URI

OAuth2 access token URL (can point to own endpoint), this is used to get OAuth tokens for upstream services.

CASSANDRA_CONTACT_POINTS

Comma separated list of Cassandra cluster IPs.

CASSANDRA_CLUSTER_NAME

Cassandra cluster name.

API_SECURITY_RAW_SYNC_EXPR

Spring security expression, e.g. "#oauth2.hasScope('application.write_all_sensitive')"