# ungleich-otp

ungleich-otp is a full blown authentication and authorisation service
made for micro services.

The basic idea is that every micro service has a (long term) seed and
creates time based tokens (See python pyotp, RFC4226, RFC6238).

## Setup instructions ##

This is a standard django project and thus can be easily setup using

```
pip install -r requirements.txt
```

To bootstrap the application, you need your very first trusted seed to
access the application. You can generate it using

```
to be filled in
```

After that, you can run the application using

```
python manage.py runserver
```

The usual instructions on how to setup an https proxy should be followed.

## Realms ##

Access is granting/denied based on realms. There are two reserved
realms, all other realms can be used by the users:

### Reserved realms

Conceptually the realms "ungleich-admin" and "ungleich-auth" are
reserved for higher priviliged applications.

Usually there is only 1 entry in ungleich-admin that is used to
bootstrap and manage ungleich-otp.

All micro services that are trusted to authenticate another micro
service should have an entry in the ungleich-auth realm, which allows
them to verify a token of somebody else.


| Name             | Capabilities                               |
|------------------+--------------------------------------------|
| ungleich-admin   | authenticate, create, delete, list, update |
| ungleich-auth    | authenticate                               |
| all other realms | NO ACCESS                                  |


## Usage: REST ##

- Use an existing token to connect to the service
- All REST based messages: JSON


### POST: /ungleichotp/verify

Request JSON object:

```
{
    version: "1",
    name: "your-name",
    realm: "your-realm",
    token: "current time based token",
    verifyname: "name that wants to be authenticated",
    verifyrealm: "realm that wants to be authenticated",
    verifytoken: "token that wants to be authenticated",
}
```

Response JSON object:

Either
```
{
    status: "OK",
}
```

OR

```
{
    status: "FAIL",
}
```

### POST /register

Register a new seed. Returns an app ID.

Request JSON object:

```
{
    version: "1",
    appuuid: "your-app-uuid",
    token: "current time based token",
    username: "user this app belongs to",
    appname: "name of your web app"
}
```

Response JSON object:

```
{
    status: "OK",
    appuuid: "UUID of your app",
}
```

OR

```
{
    status: "FAIL",
    error: "Reason for failure"
}
```

### POST /app/register

Register a new app. Returns an app ID.

Request JSON object:

```
{
    version: "1",
    appuuid: "your-app-uuid",
    token: "current time based token",
    username: "user this app belongs to",
    appname: "name of your web app"
}
```

Response JSON object:

```
{
    status: "OK",
    appuuid: "UUID of your app",
}
```

OR

```
{
    status: "FAIL",
    error: "Reason for failure"
}
```

### GET /app

List all registered apps for the current user.

Request JSON object:

```
{
    version: "1",
    appuuid: "your-app-uuid",
    token: "current time based token"
}
```

Response JSON object:

```
{
    status: "OK",
    apps: [
        {
            name: "name of your web app"
            appuuid: "UUID of your app",
        },
        {
            name: "name of your second web app"
            appuuid: "UUID of your second app",
        }
    ]
}
```

### GET /app/UUID

Get seed for APP to be used as a token

Request JSON object:

```
{
    version: "1",
    appuuid: "your-app-uuid",
    token: "current time based token"
}
```

Response JSON object:

```
{
    status: "OK",
    seed: "seed of your app"
}
```


## Usage: OTP

The seeds that you receive can be used for TOTP to authenticate your
apps.


## Database

The database saves a list of appuuids with their seeds and the user
assignments as well as whether the appuuid might use the BUS interface.

Fields:

- appuuid (a random UUID)
- appname (name chosen by the user)
- username (who this appuuid belongs to)
- seed  (a random base32 string)
- trusted (boolean, whether app is allowed to use the BUS and the
  verify method)


## Environment / Configuration

- POSTGRES_USERNAME
- SECRET_KEY -- random

## Random notes / stuff

django.db.backends.postgresql
django.contrib.admin

```
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mydatabase',
        'USER': 'mydatabaseuser',
        'PASSWORD': 'mypassword',
        'HOST': '127.0.0.1',
        'PORT': '5432',
    }
}
```

Custom auth

```
from django.contrib.auth.models import User
from rest_framework import authentication
from rest_framework import exceptions

class ExampleAuthentication(authentication.BaseAuthentication):
    def authenticate(self, request):
        username = request.META.get('X_USERNAME')
        if not username:
            return None

        try:
            user = User.objects.get(username=username)
        except User.DoesNotExist:
            raise exceptions.AuthenticationFailed('No such user')

        return (user, None)

```

## TODOs

- [x] serialize / input request
- [ ] Remove hard coded JSON
- [ ] Implement registering of new entries
- [ ] Use Custom authentication (?) - set User
- [ ] Maybe we map name+realm == User (?)