Testausserveri ID

Use one OAuth2 service as a proxy for many more.

That's the general idea. The implementation though, in the terms of security, is a little more complex.

For now, this project implements 2 methods of authentication, Discord and Twitter (more are being added).

Twitter represents the OAuth 1.0a authentication flow and Discord the OAuth 2.0 authentication flow.

Due to the severe implications of a possible programming error or a vulnerability in a project like this, this project will remain as a demo until further notice. DO NOT USE IT IN ANY PRODUCTION ENVIRONMENT!

You can test the application directly at id.testausserveri.fi and the example client implementation at idexample.testausserveri.fi.

TODO-list

You should read these before making an issue. These will be fixed/implemented asap.

Port over the other 8 login methods from the prototype
Code audit
Cybersecurity assessment
Bug bounty?
Token revocation after authentication

Documentation

This is the draft documentation for this project.

General

This project's backend is developed with Node.Js v16.13.2 and uses Docker and Docker-compose for development and deployment. MongoDB functions as the backend database. Major dependencies are the mongoose and dotenv packages from the NPM-registry, otherwise this project only uses native Node.Js libraries.

The front-end is rather bare-bones and is developed with pure HTML5, CSS and JavaScript.

Configuration

Relevant configuration for the front-end exists in /src/app/branding.json. This is the configuration for the front-end application's themes. All colors and relevant text is configurable.

Login methods are configured with /src/methods.json. The only notable thing about the structure is that the credentials object's key's values are environment variable names.

Environment variables are configured with the .env file. See .env.example for more details on what variables are required.

CLI

This project implements a rather simple CLI to create, update and remove application registrations, though these details can be updated directly to the database by some other program as long as they follow the specified database schemas.

Command usage and definitions can be viewed with the help command.

Example output

Commands:
- "exit", closes the program.
- "help", displays this message.
- "createApplication <MongoDB JSON query>", create an application.
    - name: string
    - homepage: string
    - icon: base64 image string
    - redirectURLS: string[]
- "updateApplication <MongoDB JSON query>", update an application.
    - identical with createApplication
- "getApplications", get all applications.
- "removeApplication <MongoDB JSON query>", remove an application.
    - id: string

Project structure

src
├───app
├───database
├───methods
│   └───api
│       ├───_callbacks
│       └───_preflights
├───typings
└───util

The app directory contains the front-end application for method selection during login.
The database directory contains all database-related scripting and schemas.
The methods directory is a collection of dynamically loaded webserver methods. A template for these methods is available in /dev. The directory structure of the methods directory does not in any way reflect how the methods are loaded. It exists only for the sake of organization of files.
The typings folder includes all the *.ts typings for IntelliSense (etc.)
The util directory includes various smaller scripts and libraries used across this project's source code.

Running this project

This project uses docker-compose for deployment and testing. You can run the project with docker-compose up.

To run the project without docker-compose, you need to have Node v16.13.2 and NPM v8.1.2 or later installed (older version may work) and follow these steps:

Install all dependencies with npm install
Define DATABASE_URL in the .env as the URL of the MongoDB database.
Run the project with npm start

API v1 Documentation

The API root is: /api/v1/

Methods marked with (private) are only used internally.

API v1 implements a standard OAuth 2.0 authentication service, with the following configuration:

GET /api/v1/authenticate as the authorization endpoint.
POST /api/v1/token as the token retrieval endpoint.

Error format

{ "error": "<error description>" }

The "error" value will never be included in the response if it was successful.

Available scopes

- "token", pass through the account accessToken from the authentication flow (high risk)
- "id", include the user-id in the /api/v1/me response
- "account", include general account details, like the account name and icon in the /api/v1/me response
- "contact", include account email and/or phone number in the /api/v1/me response
- "security", include relevant information about the account security configuration in the /api/v1/me response

At least one scope must always be included

Example flow of authentication with v1's code flow

[CLIENT] The user is redirected to /api/v1/authenticate?... from the client application.
- A new authentication session is created in the backend (stage: created)*
The user is automatically redirected to /app?state=...
The user selects the platform to authenticate with.
The user is redirected to /api/v1/login?platform=...&state=...
- Authentication stage changes in the backend (state: pending)*
The user is automatically redirected to platform's login service.
The user is redirected from the platform login to /api/v1/callback after authenticating.
- Authentication stage changes (stage: completed)*
[CLIENT] The user is redirected back to client application's callback URL with code=... in the request query.
[CLIENT] The client application makes a request to /api/v1/token?code=... and gets token
- Authentication stage changes in the backend (stage: stored)*
[CLIENT] The client application makes a request to /api/v1/me with token in the header: Authentication: Bearer <token>
- Authentication session is deleted

--> User has now been authenticated

*An authentication stage change defines a point of no return for the authentication flow Steps prefixed with [CLIENT] are the clients responsibility

Methods

`POST /api/v1/token`

Exchange the "code" for an access token to access the authenticated user's information.

Request requirements

Header "Content-Type" must be "application/x-www-form-urlencoded"
Body must include parameters "code", "grant_type", "redirect_uri", "client_id" and "client_secret".
- "grant_type" must be "authorization_code"
- "redirect_uri" must match with the uri used before with /authenticate

Example response

HTTP/1.1 200 OK
Content-Type: application/json
Date: Mon, 07 Mar 2022 09:46:17 GMT
Connection: close
Content-Length: ...

{ "token": "...", "expiry": "<ms>" }

`GET /api/v1/application`

Retrieve information about a registered application. Displayed during the login process.

Request requirements

The request query parameters must contain "client_id" as the application's ID to query.

Example response

HTTP/1.1 200 OK
Content-Type: application/json
Date: Mon, 07 Mar 2022 09:46:17 GMT
Connection: close
Content-Length: 107

{ "id": "d3c89442d3574aa5bbaea011f2d43e14", "name": "Test application", "icon": "","homepage": "http://localhost" }

`GET /api/v1/methods`

Retrieve a list of available authentication methods.

Example response

HTTP/1.1 200 OK
Content-Type: application/json
Date: Mon, 07 Mar 2022 09:46:16 GMT
Connection: close
Content-Length: 193

[
    {
        "name": "Discord",
        "id": "2db260c7-8ca9-42a3-8de8-a6a3c37be89e",
        "icon": "/app/assets/Discord.svg"
    },
    {
        "name": "Twitter",
        "id": "ba8aad4d-9014-4ecc-9df3-e2d520b4c23e",
        "icon": "/app/assets/Twitter.svg"
    }
]

`GET /api/v1/authenticate`

Begin the authentication flow by creating a new authentication session.

Request requirements

Request query must include response_type=code.
- An alternate token response type exists in the V2 API (documentation below).
Request query must contain valid client_id, redirect_uri and scope parameters (more about scopes above).

Optional

The request query may include the state query parameter to identify the session callback later on in the authentication flow.
The request query may include the noRedirect query parameter in which case the server response will not a a redirect (307), but instead a normal 200 response with the location header's name changed to x-Location.

Example response

HTTP/1.1 307 Temporary Redirect
Location: /app?scopes=token,id,account,contact,security&client_id=d3c89442d3574aa5bbaea011f2d43e14&state=572dd500b8c73b26b00a45693336058c&redirect_uri=http://localhost/callback
Content-Type: text/html
Date: Mon, 07 Mar 2022 09:46:15 GMT
Connection: close
Content-Length: 218

If you are not redirected click <a href="/app?scopes=token,id,account,contact,security&client_id=d3c89442d3574aa5bbaea011f2d43e14&state=572dd500b8c73b26b00a45693336058c&redirect_uri=http://localhost/callback">this</a>.

`GET /api/v1/login` (private)

Redirect the user to the method login.

Request requirements

The request query must include valid state (redirectId) and method (id) parameters.

Example response

HTTP/1.1 307 Temporary Redirect
Location: https://discord.com/api/oauth2/authorize?...
Content-Type: text/html
Date: Mon, 07 Mar 2022 09:46:18 GMT
Connection: close
Content-Length: ...

If you are not redirected, click <a href="https://discord.com/api/oauth2/authorize?...">here</a>.
<br>
<i>(https://discord.com/api/oauth2/authorize?...)</i>

`GET /api/v1/callback` (private)

The callback url from the selected authentication method. Request requirements are method specific. Responses are method specific. See /src/methods/api/_callbacks/.

`GET /api/v1/me`

Get information about the logged-in user.

Request requirements

The request headers must include the account access token as "Bearer" (Bearer <token>).

Example response

HTTP/1.1 200 OK
Content-Type: text/html
Date: Mon, 07 Mar 2022 09:46:18 GMT
Connection: close
Content-Length: ...

{
    "?token": "<Account access token>",
    "?id": "<Account ID>",
    "?name": "<Account name>",
    "?account": "<General account information, platform specific>",
    "?security": "<Account security information, platform specific>",
    "?contact": "<Account contact details, platform specific>",
    "scopes": "String[]",
    "applicationId": "<Application ID>",
    "platform": {
        "id": "<Platform ID>",
        "name": "<Platform name>"
    }
}

The fields prefixed with ? are present/missing depending on what scopes were used. See available scopes above.

API V2

Implements the same configuration as API V1. Only difference is the supported methods.

Example flow of authentication with v2's token flow

[CLIENT] The user is redirected to /api/v2/authenticate?... from the client application.
- A new authentication session is created in the backend (stage: created)*
The user is automatically redirected to /app?state=...
The user selects the platform to authenticate with.
The user is redirected to /api/v1/login?platform=...&state=...
- Authentication stage changes in the backend (state: pending)*
The user is automatically redirected to platform's login service.
The user is redirected from the platform login to /api/v1/callback after authenticating.
- Authentication stage changes (stage: completed)*
[CLIENT] The user is redirected back to client application's callback URL with token=... in the request query and gets the token.
- Authentication stage changes in the backend (stage: stored)*
[CLIENT] The client application makes a request to /api/v1/me with token in the header: Authentication: Bearer <token>
- Authentication session is deleted

--> User has now been authenticated

*An authentication stage change defines a point of no return for the authentication flow Steps prefixed with [CLIENT] are the clients responsibility

`POST /api/v2/request_token`

Create an authentication session with scopes and allowed methods configured server-side.

This somewhat imitates the OAuth 1.0a authorization flow.

Request requirements

The request headers must include the client secret token as "Bearer" (Bearer <token>).
Header "Content-Type" must be "application/x-www-form-urlencoded"
The request body must include parameters
- redirect_uri
- scope (authentication scopes)
- methods (list of method IDs see /api/v1/methods for more details)

Optional

The request body may include the state parameter to identify the session callback later on in the authentication flow.

Example response

HTTP/1.1 200 OK
Content-Type: application/json
Date: Mon, 07 Mar 2022 09:46:17 GMT
Connection: close
Content-Length: ...

{ "oauth_token": "..." }

`GET /api/v2/authenticate`

Continue the authentication flow after manual session creation to the "created" stage.

Request requirements

Request query must contain valid oauth_token. If no oauth_token is provided, see next requirement.
(If no oauth_token is provided) Request query must contain response_type=token.
- Therefore, the request must contain valid client_id, redirect_uri and scope parameters (more about scopes above).

Optional

The request query may include the state query parameter to identify the session callback later on in the authentication flow.
The request query may include the noRedirect query parameter in which case the server response will not a a redirect (307), but instead a normal 200 response with the location header's name changed to x-Location.

Example response

HTTP/1.1 307 Temporary Redirect
Location: /app?scopes=token,id,account,contact,security&client_id=d3c89442d3574aa5bbaea011f2d43e14&state=572dd500b8c73b26b00a45693336058c&redirect_uri=http://localhost/callback
Content-Type: text/html
Date: Mon, 07 Mar 2022 09:46:15 GMT
Connection: close
Content-Length: 218

If you are not redirected click <a href="/app?scopes=token,id,account,contact,security&client_id=d3c89442d3574aa5bbaea011f2d43e14&state=572dd500b8c73b26b00a45693336058c&redirect_uri=http://localhost/callback">this</a>.

Development resources and notes

About OAuth: https://aaronparecki.com/oauth-2-simplified/

Authentication stages

created (after /authenticate call)
pending (after platform has called back, user redirected)
completed (after callback)
stored (token given, pending for deletion)

Logging errors in V1 API

Errors thrown by methods, which begin with safe: , will have their message as a string in the response.

Implementation best practices - ideas

Verifying the user used the same platform as before to authenticate is essential. Could we somehow force this check to take place? Like including the platform id within the user id? Or the platform name?

Implementing a new method

Implementing a new authentication method should be a trivial task. Here's a step-by-step guide on how to do that.

First, create the callback in src/methods/api/_callbacks/. The name of the file has to be the method <name>.js?.
- A template for callbacks can be found in dev/methodExample.js
Write the method configuration to src/methods.json

Example
```
    {
        "name": "Example",
        "prettyName": "Optional pretty name with spaces and stuff",
        "id": "<Random uuidV4>",
        "icon": "/app/assets/<name>.svg",
        "url": "https://example.com/login/oauth/authorize?scope=${scopes}&client_id=${process.env.EXAMPLE_CLIENT_ID}&redirect_uri=${redirectURI}%3Fstate=${state}",
        "credentials": {
            "clientId": "EXAMPLE_CLIENT_ID",
            "secret": "EXAMPLE_CLIENT_SECRET"
        }
    }
```
The credential's fields values are the names of the environment variables used to store the credentials in .env. The keys of these fields define what name you will use with the getCredentials utility. In this case you can read the clientId at runtime with getCredentials("Example", "clientId").

The url is the OAuth server URL for the method to be added. For all the variables, look at the list further below.

The icon field's value is the location of the method icon accessible in the src/app directory. The icon is directly used in the img element's source, so no special format restrictions apply.
Implement scope conversions in src/util/getScopes. Configuration is at the top of the file (this may change soon).
- Include the character(s) that separates scopes in the scopeSeparator object, when multiple scopes are used.
- Include direct scope conversions in the scopeConversion object. These are direct key->value conversions to convert Testausserveri ID scopes to the ones the specific method wants to access the appropriate data. Using the least permissive scopes during conversion is recommended.
Include the credentials in the .env files with the names you specified before in src/methods.json

...and that's it!

`src/methods.json` supported variables

${scopes}, authentication scopes generated by scope conversions
${process.env.<name>}, a dynamic way to input any environment variable to the url. Especially useful for avoiding static client ids in the url.
${redirectURI}, the Testausserveri ID redirect uri.
${state}, the required authentication state code defined by Testausserveri ID.

Contributing

Contributions are welcome. A few requirements:

Read through this document
Use conventional commits
Use ESLint to enforce code-style and best practices

LICENSE

   Copyright 2022 Testausserveri ry

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

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.gitattributes		.gitattributes
.gitignore		.gitignore
.nvmrc		.nvmrc
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
docker-compose.yml		docker-compose.yml
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package.json		package.json

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API v1 Documentation

Methods

`POST /api/v1/token`

`GET /api/v1/application`

`GET /api/v1/methods`

`GET /api/v1/authenticate`

`GET /api/v1/login` (private)

`GET /api/v1/callback` (private)

`GET /api/v1/me`

API V2

`POST /api/v2/request_token`

`GET /api/v2/authenticate`

Development resources and notes

Authentication stages

Logging errors in V1 API

Implementation best practices - ideas

Implementing a new method

`src/methods.json` supported variables

Contributing

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API v1 Documentation

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POST /api/v1/token

GET /api/v1/application

GET /api/v1/methods

GET /api/v1/authenticate

GET /api/v1/login (private)

GET /api/v1/callback (private)

GET /api/v1/me

API V2

POST /api/v2/request_token

GET /api/v2/authenticate

Development resources and notes

Authentication stages

Logging errors in V1 API

Implementation best practices - ideas

Implementing a new method

src/methods.json supported variables

Contributing

LICENSE

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`POST /api/v1/token`

`GET /api/v1/application`

`GET /api/v1/methods`

`GET /api/v1/authenticate`

`GET /api/v1/login` (private)

`GET /api/v1/callback` (private)

`GET /api/v1/me`

`POST /api/v2/request_token`

`GET /api/v2/authenticate`

`src/methods.json` supported variables