OpenCred: The Open Credentials Platform

OpenCred is a system designed to make it easy for organizations (verifiers) to check credentials from individuals (holders), with their consent, in a secure and verifiable way.

In other words, OpenCred is like a digital verification checkpoint where organizations can ask for proof of certain information, like a driver's license, and an individual can decide if they want to provide that information from their digital wallet.

Features

OpenCred supports the following list of features:

Docker-based deployment to popular on-premise, hybrid, and cloud environments such as Amazon Web Services, Google Cloud Platform, and Microsoft Azure.
Horizontal scaling to support tens of millions of verifications per day.
Internationalization support to support multiple languages.
Support for the W3C Verifiable Credentials Data Model and W3C Decentralized Identifiers.
Support for workflows as an OpenID Connect Identity Provider or using an HTTP API for non-OpenID systems.
Open digital wallet selection support through the Credential Handler API (CHAPI)
Presentation protocol support for Verifiable Credential Exchanges API (VC API) and OpenID for Verifiable Presentation (OID4VP).
Native/local verifier support that is not dependent on any external services.
Remote/external verifier support using either the Verifiable Credential Verification API (VC API) or Microsoft Entra
Storage of historical DID Documents to enable auditing of past presentations.

Usage

Configuration

The app is configured via a YAML file compatible with @bedrock/config-yaml. See configs/combined.example.yaml for an example.

Copy the example to the default config location cp configs/combined.example.yaml configs/combined.yaml and edit the file. Configure the details for your relying party and any of the OpenCred features below.

💡 Tip: When using VS Code with the YAML extension, you'll get type hints as you edit your configs/combined.yaml file.

If a BEDROCK_CONFIG environment variable is set, the config specified in the environment variable will supersede any file based configuration. The environment variable must be a Base64 encoded string based on a YAML config file. The environment variable may be set with the following command:

export BEDROCK_CONFIG=$(cat combined.yaml | base64)

Optional Config File Validation in VS Code

If you're using VS Code as your editing environment, you can install an extension and configure automatic schema validation for your combined.yaml file. This will provide you with real-time feedback as you type in your configuration file. Errors on missing required properties, descriptions and example values for configuration fields, auto-complete of fields are supported.

To configure your VS Code workspace to use auto-completion, install the plugin redhat.vscode-yaml and add settings to a .vscode/settings.json file at the root of this repo. If the file does not exist, create it. Add the following content to the file:

{
  "yaml.schemas": {
    "./configs/combined.schema.json": "combined.yaml"
  },
  "yaml.format.enable": true,
  "yaml.completion": true,
  "yaml.validate": true,
  "yaml.format.proseWrap": "preserve",
  "yaml.format.printWidth": 80
}

Configuring a Native workflow

Update the relyingParties section of the config file to include a relying party with a workflow of type native. The native workflow type is used to implement an OID4VP or VC-API exchange on this instance of OpenCred. This results in a QR code being displayed to the user or returned through the initiate exchange API endpoint that can be scanned by a wallet app. The wallet app will then present the user with a list of credentials that can be used to satisfy the request.

Configuring did:web endpoint

You can use OpenCred as a did:web endpoint by configuring the didWeb section of the config file. The following would result in a DID document being published for the DID did:web:example.com. The document would be available from OpenCred at /.well-known/did.json. If domain linkage is supported, you can find that document at /.well-known/did-configuration.json.

didWeb:
  mainEnabled: true
  linkageEnabled: true
  mainDocument: >
    {
      "id": "did:web:example.com",
      "@context": [
        "https://www.w3.org/ns/did/v1",
        {
          "@base": "did:web:example.com"
        }
      ],
      "service": [
        {
          "id": "#linkeddomains",
          "type": "LinkedDomains",
          "serviceEndpoint": {
            "origins": [
              "https://example.com"
            ]
          }
        },
        {
          "id": "#hub",
          "type": "IdentityHub",
          "serviceEndpoint": {
            "instances": [
              "https://hub.did.msidentity.com/v1.0/test-instance-id"
            ]
          }
        }
      ],
      "verificationMethod": [
        {
          "id": "test-signing-key",
          "controller": "did:web:example.com",
          "type": "EcdsaSecp256k1VerificationKey2019",
          "publicKeyJwk": {
            "crv": "secp256k1",
            "kty": "EC",
            "x": "test-x",
            "y": "test-y"
          }
        }
      ],
      "authentication": [
        "test-signing-key"
      ],
      "assertionMethod": [
        "test-signing-key"
      ]
    }
  linkageDocument: >
    {
      "@context": "https://identity.foundation/.well-known/did-configuration/v1",
      "linked_dids": ["eyJhbGciOiJFZERTQSIsImtpZCI6ImRpZDprZXk6ejZNa29USHNnTk5yYnk4SnpDTlExaVJMeVc1UVE2UjhYdXU2QUE4aWdHck1WUFVNI3o2TWtvVEhzZ05OcmJ5OEp6Q05RMWlSTHlXNVFRNlI4WHV1NkFBOGlnR3JNVlBVTSJ9.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.aUFNReA4R5rcX_oYm3sPXqWtso_gjPHnWZsB6pWcGv6m3K8-4JIAvFov3ZTM8HxPOrOL17Qf4vBFdY9oK0HeCQ"]
    }

Configuring Signing Key

You must configure a signing key by entering key information in the signingKeys section of the config, and the public keys will be published in the ./well-known/jwks.json endpoint for keys with the id_token purpose as well as in the .well-known/did.json endpoint for keys with the authorization_request purpose.

Supported key types for JWT signing include:

JWT alg ES256: generate a seed with npm run generate:prime256v1.

signingKeys:
  - type: ES256
    id: 91705ba8b54357e00953b2d5cc2d805c25f86bbec4777ea4f0dc883dd84b4803
    privateKeyPem: |
      -----BEGIN PRIVATE KEY-----
      MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgdU1KX0SdMjy4AzVm
      5awy7B3tHz0y+mckq/x2V8fWwrmhRANCAARkJ4rsoMcdayGPTcAbgLfKRdqwN57I
      n9CRsED9Yno+oC4R7xz6xXpT2CQAkioPDmou1DYYU+oMaV9lCjvw9vqs
      -----END PRIVATE KEY-----
    publicKeyPem: |
      -----BEGIN PUBLIC KEY-----
      MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEZCeK7KDHHWshj03AG4C3ykXasDee
      yJ/QkbBA/WJ6PqAuEe8c+sV6U9gkAJIqDw5qLtQ2GFPqDGlfZQo78Pb6rA==
      -----END PUBLIC KEY-----
    purpose:
      - id_token
      - authorization_request

Configuring id_token claims for OIDC

Within your relying party configuration, you may configure claims that will be extracted from a credential and included in the id_token result of an Open ID Connect login flow. The following example will extract the email claim from a credential that is presented by the user. The email claim will be included in the id_token that is returned to the relying party.

relyingParties:
  - clientId: example
    clientSecret: example
    redirectUri: http://localhost:8080/oidc/callback
    workflow:
      ...
    claims:
      - name: email
        path: userEmail

This configuration will place an email claim in the JWT, and the value of that claim will be drawn from credentialSubject.userEmail path in the credential that is verified to match the workflow requirements, if successfully presented. In the workflow, you can use the method appropriate to the workflow type to specify which Verifiable Credential type, context, and/or issuers you will accept. This enables the specification of a plaintext path relative to credentialSubject to source the claim value from.

Configuring Exchange Variables

It is possible to include additional variables that will be passed along with an exchange. These can be passed through to the exchange creation process via query parameters or as JSON body properties. It is important to note that these params originate from the client side application and so should be treated as "untrusted".

While configuring a relying party workflow an untrustedVariableAllowList property contains a list of variables that are allowed to be passed in this manner. There is a default redirectPath variable that will always be included.

relyingParties:
  - clientId: example
    workflow:
      type: native
      id: example-workflow
      untrustedVariableAllowList:
        - caseId
        - color

Configuring a Workflow Step

A workflow step configures the specifics of how a presentation is requested. The step contains a verifiablePresentationRequest which uses a VPR to create a Presentation Exchange (PE) object to be included in the request. If for whatever reason the constraints need to be overwritten that can be accomplished using the constraintsOverride property.

Callbacks

A step can also include a callback that will be sent an http POST request with the id, variables and step of the exchange. The callback URL can optionally be protected by oauth2 and can include headers using a customizable variable.

callback:
  url: http://localhost:9000/callback
  headersVariable: callbackHeaders
  oauth:
    issuer: http://example.com
    token_url: http://example.com/token
    client_secret: exampleClientSecret
    client_id: exampleClientId
    scope:
      - default

Configuring Exchange UX Methods

OpenCred supports two methods for initiating an exchange with a wallet app, Credential Handler API (CHAPI), and OpenID for Verifiable Presentations(OID4VP). Implementers may choose which of these protocols are supported by configuring the options.exchangeProtocols list in the config file. The order of the protocols controls the order in which they are offered to the user.

options:
  exchangeProtocols:
    - chapi
    - openid4vp

If this section is omitted, both protocols (openid4vp and chapi) will be offered, with an OID4VP QR code offered to the user first.

Configuring Translations

With Translations in Configuration

The login page has text entries stored in the translations entries of the config. To configure the text of the login page set the following entries with the enabled languages as the first level of translations:

translations:
  en:
    translations:
      en: English
      fr: French
    translate: Translate
    qrTitle: Login with your Wallet app
    qrPageExplain: Scan the following QR Code using the Wallet app on your phone.
    qrPageExplainHelp: (<a href="https://youtube.com">How do I do it?</a>)
    qrFooter: "Note: Already on your phone with the Wallet app? Open the Wallet app, then come back and tap on the QR code above."
    qrFooterHelp: Difficulty using the Wallet app to login? revert to using password <a href="#">here</a>
    qrDisclaimer: If you don't have a Wallet app download it from the app store.
    qrClickMessage: The Wallet app must be running in the background.
    openid4vpAnotherWay: Want to try another way?
    openid4vpQrAnotherWay: Use a wallet on this device
    chapiPageAnotherWay: "Looking for a QR code to scan with your wallet app instead?"
    loginCta: "Login with your credential wallet"
    loginExplain: "To login with your credential wallet, you will need to have the credential wallet app <with configurable URL to app stores> installed"
    appInstallExplain: "If you don't have a credential wallet yet, you can get one by downloading the credential wallet app <with configurable URL to app stores>"
    appCta: "Open wallet app"
    copyright: "Powered by OpenCred"
    pageTitle: "Login"
  fr:
    translations:
      en: Anglais
      fr: Français
    translate: Traduire
    qrTitle: Connectez-vous avec votre application CA DMV Wallet
    ...

With Google Translate

It is also possible to use an embedded Google Translate widget that will enable translations without including all of the translations in the configuration. To enable this feature include a customTranslateScript property (which will override manual translations) in the config with a URL to a script that includes a script for injecting the widget. To use the default Google Translate script use the following config:

customTranslateScript: https://translate.google.com/translate_a/element.js?cb=googleTranslateElementInit

Configuring Audit

You can add auditing support to OpenCred to ensure that a VP token presented in the past was valid at the time it was presented. The VP token can be one of two formats: (1) JWT or (2) Data Integrity. In order to enable this feature, use the boolean field audit.enable and the array field audit.fields in the config file. Additionally, you may optionally configure the following fields: reCaptcha.enable (boolean), reCaptcha.version (number), reCaptcha.siteKey (string), reCaptcha.secretKey (string), and reCaptcha.pages (array) (more on these later). Here is a sample audit configuration:

audit:
  enable: true
  fields:
    - type: text
      id: given_name
      name: First Name
      path: "$.credentialSubject.given_name"
      required: true
    - type: text
      id: family_name
      name: Last Name
      path: "$.credentialSubject.family_name"
      required: false
    - type: date
      id: birth_date
      name: Date of Birth
      path: "$.credentialSubject.birth_date"
      required: true
    - type: number
      id: height
      name: Height (cm)
      path: "$.credentialSubject.height"
      required: false
    - type: dropdown
      id: sex
      name: Sex
      path: "$.credentialSubject.sex"
      required: false
      options:
        "Male": 1
        "Female": 2
    - type: dropdown
      id: senior_citizen
      name: Are you a senior citizen?
      path: "$.credentialSubject.senior_citizen"
      required: true
      options:
        "Yes": 1
        "No": null
      default: "No"
reCaptcha:
  enable: true
  version: 2
  siteKey: 6LcNDSjdAAAAAAAAIe2uy0gavf0reiuhfer12345
  secretKey: 6LcNDSjdAAAAAAAAIe3uy1gavf1reiuhfer67890
  pages:
    - audit

The audit.enable field enables support for auditing in an OpenCred deployment (default: false). If you would also like to check for matching values in the token's credential in a web interface, you can specify the following attributes for each field of interest via the audit.fields field and visit BASE_URL/audit-vp in the browser:

type - The field type (currently, supports text, number, date, and dropdown).
id - The field ID (can be anything, but must be unique among other fields).
name - The field name that appears in the web interface.
path - The field path in the credential (must be unique among other fields).
required - Whether the admin user is required to enter a value for the field in the web interface.
options - Data binding from user-friendly name to associated value for the field in the web interface. This property is used whenever a field can have one of multiple possible machine-readable values in a discrete set of options (e.g., Male -> 1, Female -> 2). The input for this field will be presented as a dropdown selection element. If one of the options is the absence of the field from the credential, you can represent this by binding the field to null. For example, here are the expectations for each selection for the field named Are you a senior citizen? in the sample snippet above:
- Yes - There exists a field with path $.credentialSubject.senior_citizen containing value 1 in the credential.
- No - There does not exist a field with path $.credentialSubject.senior_citizen in the credential.
default - The default value for the field in the web interface (if not required). For a dropdown-type field, use the string label of the field, not the value.

If you would like to enable reCAPTCHA in the audit web interface, you should specify the following fields after registering your OpenCred domain in the reCAPTCHA registration page (Note: you may register localhost for local development):

reCaptcha.enable - Whether to enable reCAPTCHA (default: false).
reCaptcha.version - The version of reCAPTCHA that you registered for the domain (required if reCaptcha.enable is true). At the time of this writing, the only available versions are 2 and 3.
reCaptcha.siteKey - The reCAPTCHA site key that you registered for the domain (required if reCaptcha.enable is true).
reCaptcha.secretKey - The reCAPTCHA secret key that you registered for the domain (required if reCaptcha.enable is true).
reCaptcha.pages - Array of page IDs for which to enable reCAPTCHA (audit in the case of the audit web interface).

If you want to test out the audit feature, follow these steps:

Run an instance of OpenCred using the instructions below.
Follow the steps in the running app to present a credential to OpenCred.
Run mongosh mongodb://localhost:27017/opencred_localhost.
Run db.Exchanges.find().pretty().
Search for vpToken.
Run cp test/fixtures/audit/vpTokenExample.json test/fixtures/audit/vpToken.json.
Open test/fixtures/audit/vpToken.json and replace the value in the vpToken field with the token from an earlier step.
Optionally, add mapping from credential field paths to expected value.
Run npm run audit-vp BASE_URL, where BASE_URL is the base URL of the running app, configured as app.server.baseUri in the config.
Observe verification results.

Run via node

This app uses a @bedrock/express server and a Vue 3 UI client application. It supports hot reloading for UI changes during development.

Prerequisites:

Node v20
MongoDB v5

Install dependencies, compile the UI, and run the server:

$ npm i
$ npm run build
$ npm run start

Optional Remote Tunnel Setup

In order to interact with a wallet or resolve did:web identifiers remotely, it will be necessary to run the server over HTTPS from your local computer. You can use localtunnel to set up a tunnel to your local server.

First, you must install localtunnel globally.

npm i -g localtunnel

And then run the tunnel

npm run tunnel

The above command will output the domain of your remote tunnel URL. You will need to access that URL once to finish setting up the tunnel using the instructions on that page.

Set your app.server.baseUri in your combined.yaml with the above URL: baseUri: "https://evil-cows-return.loca.lt"

Then, you can run the server with the following:

npm run start

Run via Docker

You can build and run the server via Docker mounting your local configuration file with the following commands. $PWD substitution is the expected format for current working directory unix/bash/zsh, Substitute your actual project root path for other systems.

$ docker build . -t opencred-platform
$ docker run -d -p 22443:22443 -v $PWD/configs:/etc/app-config opencred-platform
$ curl https://localhost:22443/health/live

Integrating with OpenCred

OpenCred makes it easy to request a credential from a user and return information to a connected application or "relying party." This can either be done with OpenID Connect or calling OpenCred's HTTP API for more precise control.

Choose OpenID Connect if you can redirect the user in a browser to OpenCred and want to use a standard protocol for authentication that may already be supported in your environment or easy to integrate using a well-known library. This method enables you to obtain an id_token that contains claims extracted from the credential that the user presents.
Choose the HTTP API if redirecting the user in a browser is impractical, you want to present the credential request to the user via your own interface (displaying a QR code and enabling the user to launch a wallet app for same-device wallet use), or you want to receive the Verifiable Presentation and Verifiable Credential data in their original form.

Open ID Connect Login

You can enable users to sign into a relying party application with a Verifiable Credential using OpenCred as an identity provider connected over OAuth 2.0 / OpenID Connect. OpenCred returns a signed id_token that contains specific claims

There is an openid-configuration endpoint at /.well-known/openid-configuration with detailed information about the algorithm and protocol support that the server has. It references a JWKS (keyset) endpoint at /.well-known/jwks.json that contains the signing key used to sign an id_token. Dynamic registration is not supported, so you must configure clientId and clientSecret in the relying party configuration manually, along with the credential exchange workflow that you want to use for this client.

The OIDC workflow follows this process:

Relying party directs a user's browser to the /login endpoint with appropriate query parameters client_id, redirect_uri, response_type, scope, and state.
The user is presented a login page with a QR code that can be scanned by a wallet app for wallets on a different device (using OID4VP) or a wallet initiation button for a wallet on the same device (using CHAPI).
The user scans their wallet app and selects a credential to present to the relying party. The wallet posts a signed presentation to OpenCred, and OpenCred verifies it, and updates the state of the exchange with the information.
The user is redirected back to the relying party with a code that can be exchanged for an id_token.
The relying party exchanges the code for an id_token, which contains claims extracted from the credential based on the relying party's configuration.
The relying party now can the information, such as a user identifier, to look up user data and authenticate the user or augment a user's profile.

Notes:

You must configure a signing key with the id_token purpose in the config to use this method of integration. The public key will be published in the /.well-known/jwks.json endpoint.
You must configure claims of your relyingParty to specify which claims you want to extract from the credential and include in the id_token result.
ES256 is the only supported signing algorithm for id_tokens to date.
PKCE not yet supported.
There is no userinfo endpoint, the app only supports an id_token result.

HTTP API Integration

Each time a relying party application requests a credential from a user, OpenCred manages a credential "exchange" that lets the user present a Verifiable Presentation containing a Verifiable Credential, which is verified and made available to the relying party. The HTTP API is documented in the OpenAPI format. You can view the API documentation in a Swagger UI at the /api-docs endpoint when the application is running.

The HTTP API workflow follows this process:

Establish configuration for a relying party with clientId, clientSecret, and a workflow.
Initiate an exchange for your chosen workflow with POST /workflows/{workflowId}/exchanges. Authenticate this request using HTTP Basic Auth using your client ID and client secret.
The response will contain an OID4VP URI and a QR code as a Data URI that you can present to your user to scan with a wallet app as well as a vcapi value that you can use to initiate a CHAPI wallet flow. It contains an exchangeId that will be used to check status and an accessToken that is a short lived access token that allows you to authenticate the status check request.
The user activates their wallet, for example by scanning the QR code that you present to them in your application, and presents a credential.
Check the status of the exchange with GET /workflows/{workflowId}/exchanges/{exchangeId}. Authenticate this request with a Bearer token using Authorization: Bearer {accessToken} with the accessToken from the exchange initiation. Or you may continue to use the Basic method from the first request. The accessToken is short lived and will expire after a 15 minutes and may be made available to a browser client, whereas the clientId should only be held server-side.
The response will contain an exchange object with a state that is either pending, active, complete, or invalid with additional results.

Testing

Load Testing

Load testing can be performed using artillery. To install artillery globally via npm:

npm install -g artillery@latest

Ensure that there is a relyingParties configuration in config.yaml for a relying party with clientId: load-test matching the configuration for that client found in configs/config.example.yaml. Load testing requires on this configuration remaining congruent with hardcoded fixtures and credentials in the load tests.

Run the load testing script:

npm run test:load

To run the load testing script against the QA environment:

With:

QA_BASIC_AUTH variable in a .env file which is the base64url encoding of client_id:client_secret.
QA_BASE_URL variable in a .env file which is the target base url.

npm run test:load:qa

License

BSD-3-Clause

Name		Name	Last commit message	Last commit date
Latest commit History 662 Commits
.github/workflows		.github/workflows
.reuse		.reuse
LICENSES		LICENSES
common		common
configs		configs
docs		docs
lib		lib
test		test
web		web
.dockerignore		.dockerignore
.editorconfig		.editorconfig
.eslintrc.cjs		.eslintrc.cjs
.gitignore		.gitignore
.nvmrc		.nvmrc
CHANGELOG.md		CHANGELOG.md
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
cloudbuild.yaml		cloudbuild.yaml
dev.js		dev.js
package.json		package.json
tailwind.config.js		tailwind.config.js
test.config.js		test.config.js
test.js		test.js

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OpenCred: The Open Credentials Platform

Features

Usage

Configuration

Optional Config File Validation in VS Code

Configuring a Native workflow

Configuring did:web endpoint

Configuring Signing Key

Configuring id_token claims for OIDC

Configuring Exchange Variables

Configuring a Workflow Step

Callbacks

Configuring Exchange UX Methods

Configuring Translations

With Translations in Configuration

With Google Translate

Configuring Audit

Run via node

Optional Remote Tunnel Setup

Run via Docker

Integrating with OpenCred

Open ID Connect Login

HTTP API Integration

Testing

Load Testing

License

About

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Contributors 9

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OpenCred: The Open Credentials Platform

Features

Usage

Configuration

Optional Config File Validation in VS Code

Configuring a Native workflow

Configuring did:web endpoint

Configuring Signing Key

Configuring id_token claims for OIDC

Configuring Exchange Variables

Configuring a Workflow Step

Callbacks

Configuring Exchange UX Methods

Configuring Translations

With Translations in Configuration

With Google Translate

Configuring Audit

Run via node

Optional Remote Tunnel Setup

Run via Docker

Integrating with OpenCred

Open ID Connect Login

HTTP API Integration

Testing

Load Testing

License

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