Common CanDIGv2 authorization and authentication code.

CanDIGv2 has several separate layers that are involved in authentication and authorization. This repo centralizes the protocols into a single module.

Keycloak acts as the identity provider for CanDIGv2. It uses the OpenID protocol to authenticate the user and issue a jwt in the form of a bearer token, identifying the user and their roles to other services. This token is then provided as an Authorization header to other CanDIGv2 services.

get_access_token demonstrates the exchange required to get a token.

get_auth_token is a convenience method for plucking out the access token from a request's Authorization header.

Tyk acts as a proxy redirect service for the other services of CanDIGv2. When a call is made to CanDIGv2, it goes to Tyk first. Tyk validates the bearer token presented and makes sure that it is not expired and is issued by one of the authorized CanDIGv2 sites. If it is valid, it passes the call to the relevant service. When this fails, it returns a 401 "Key not authorised" error.

add_provider_to_tyk_api and remove_provider_from_tyk_api add/remove new issuers to a particular API in Tyk.

Opa does the actual lookup of roles and authorizations for users of CanDIGv2. It contains the information about which datasets a particular user is authorized to access.

get_opa_datasets uses the user ID provided in the bearer token to look up the datasets that user is authorized to access for the given path and method. is_action_allowed_for_program returns True or False, depending on if the program is in the authorized datasets for the given path and method.

get_user_id returns the ID (key defined in .env as CANDIG_USER_KEY) associated with the user.

Opa also confirms if a user is a site admin: is_site_admin checks for whether or not this user is present in Opa's known site_admin role and returns True if so.

add_provider_to_opa and remove_provider_from_opa add/remove new issuers to Opa.

Vault acts as the secret store for CanDIGv2.

Every service can be set up to have its own secret store in Vault. Diff your module's setup against the lib/templates folder to see what you need to add to create a service store:

• your-module_setup.sh needs to call bash $PWD/create_service_store.sh "your-module"
• your-module/docker-compose.yml needs to add the following:

    secrets:
        - source: vault-approle-token
          target: vault-approle-token
    environment:
        - VAULT_URL="${VAULT_PRIVATE_URL}"
        - SERVICE_NAME="${SERVICE_NAME}"

Once those changes have been made, your service can read and write to its service store using the get_service_store_secret and set_service_store_secret methods.

Services that require S3 access need to be authorized in vault_setup.sh to access candig-ingest's aws secret store. Once that authorization is set up, the service can use the get_aws_credential,

Minio acts as the CanDIGv2 client for S3 access. get_minio_client returns a Minio object that can be used with the Python API. This method, by default, returns an object corresponding to the Minio sandbox instance.

For convenience, get_s3_url is a one-stop method for returning a presigned URL to an S3 object.

Add the following to your requirements.txt:

candigv2-authx@git+https://github.com/CanDIG/candigv2-authx.git@main

Then add import authx.auth to your code.