Authorization User Guides System vendor System User Using System User

Using System User

Guidance for system vendors on how to use a System User after it has been created.

Audience: Developers and system integrators who already have a system access and need to use it in their solutions.

The use of System User towards services occurs in the following way:

sequenceDiagram EndUserSystem->>+Maskinporten: Request token (client_id, systemUserOrgNo) Maskinporten->>AltinnAuthorization: GetSystemUser(client_id, systemUserOrgNo) AltinnAuthorization-->>Maskinporten: SystemUser details Maskinporten-->>EndUserSystem: SystemUser token EndUserSystem->>API: API request with SystemUser token API->>AltinnAuthorization: Authorize(systemUserId, resource, action, party) AltinnAuthorization-->>API: AuthorizationResponse API-->>EndUserSystem: API result

Request system access token (JWT Grant)

The OAuth2 Rich Authorization Requests (RAR) extension is used to request a system access token. Altinn defines the type urn:altinn:systemuser for this purpose.

The vendor requests a token for a specific customer by providing the customer’s organization number.
It is important that the organization number is provided according to the following standard:

"systemuser_org" : {
      "authority" : "iso6523-actorid-upis",
      "ID" : "0192:123456789"
    }

If a valid System User exists in Altinn, a Maskinporten token is issued that contains the system user’s identifier.

POST https://test.maskinporten.no/token
Content-Type: application/json

{
  "aud" : "https://maskinporten.no",
  "sub" : "fc9a8287-e7cb-45e5-b90e-123048d32d85",
  "authorization_details" : [ {
    "systemuser_org" : {
      "authority" : "iso6523-actorid-upis",
      "ID" : "0192:123456789"
    },
    "type" : "urn:altinn:systemuser"
  } ],
  "scope" : "krr:global/kontaktinformasjon.read",
  "iss" : "fc9a8287-e7cb-45e5-b90e-123048d32d85",
  "exp" : 1718124835,
  "iat" : 1718124715,
  "jti" : "89365ecd-772b-4462-a4de-ac36af8ef3e2"
}

HTTP/1.1 200 OK
Content-Type: application/json

{
  "access_token" : "IxC0B76vlWl3fiQhAwZUmD0hr_PPwC9hSIXRdoUslPU=",
  "token_type" : "Bearer",
  "expires_in" : 599,
  "scope" : "difitest:test1"
}

You can only request one organization per grant. Include at least one OAuth2 scope.

Token contents

The token returns all System Users that the customer has granted to the authenticated system. They are linked to the system through the client_id.

{
  "authorization_details": [
    {
      "type": "urn:altinn:systemuser",
      "systemuser_org": {
        "authority": "iso6523-actorid-upis",
        "id": "0192:123456789"
      },
      "systemuser_id": ["ebe4a681-0a8c-429e-a36f-8f9ca942b59f"],
      "system_id": "123456789_systemid"
    }
  ],
  "scope": "krr:global/kontaktinformasjon.read",
  "iss": "https://test.maskinporten.no/",
  "client_amr": "private_key_jwt",
  "token_type": "Bearer",
  "exp": 1718175135,
  "iat": 1718175015,
  "client_id": "fc9a8287-e7cb-45e5-b90e-123048d32d85",
  "jti": "-SpfU--1Zn_Oqvkpjwu3oVn--VLcPzSAwjqyiP6zBEw",
  "consumer": {
    "authority": "iso6523-actorid-upis",
    "ID": "0192:987654321"
  }
}

Use the Maskinporten token as a Bearer token in API calls to both the API provider and Altinn Authorization.

The service owner then uses the token against Altinn Authorization (PDP) to determine which operations the system is authorized to perform.