The ungleich OTP service
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# ungleichotp #
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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) triple
constisting of (name, realm, seed) and creates time based tokens.
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This basically revamps Kerberos in a simple way into the web area.
ungleichotp has been created and is maintained by [ungleich](https://ungleich.ch/).
Related documentation:
* [Python pyotp](https://pyotp.readthedocs.io/)
* [RFC6238, TOTP](https://tools.ietf.org/html/rfc6238)
* [RFC4120, Kerberos](https://tools.ietf.org/html/rfc4120)
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## Overview ##
This repository the reference implementation of the ungleichotp server.
## Using the ungleichotpclient ##
The client can be used to test the ungleich-otp-server.
All client commands need the parameters --auth-name and --auth-realm.
Also either --auth-seed or --auth-token needs to be specified.
```
python manage.py ungleichotpclient create \
--server-url https://otp.ungleich.ch/ungleichotp/
--auth-name admin
--auth-realm ungleich-admin
[--auth-seed THESEEDFORADMIN]
[--auth-token THECURRENTTOKEN]
```
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### Creating new users
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```
--name USERNAME --realm REALMOFUSER create
```
The seed is randomly created.
### Listing users
```
list
```
### Deleting users
```
--name USERNAME --realm REALMOFUSER delete
```
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### Verifying a token is correct
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Verify using:
```
--name USERNAME --realm REALMOFUSER --token TOKENTOBEVERIFIED verify
```
You can also verify using a seed:
```
--name USERNAME --realm REALMOFUSER --seed SEEDOFUSER verify
```
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## Server Setup instructions ##
This is a standard django project and thus can be easily setup using
```
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pip install -r requirements.txt
python manage.py createsuperuser
python manage.py runserver
```
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## Realms ##
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Access is granting/denied based on realms. There are two reserved
realms, all other realms can be used by the users:
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### 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 |
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| ungleich-auth | authenticate, verify |
| all other realms | authenticate |
```
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## Verify using http POST ##
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Post a JSON object to the server at /ungleichotp/verify/ that
contains the following elements:
Request JSON object:
```
{
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auth_name: "auth-name",
auth_realm: "auth-realm",
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auth_token: "current time based token",
name: "name that wants to be authenticated",
realm: "realm that wants to be authenticated",
token: "token that wants to be authenticated"
}
```
Response JSON object:
Either HTTP 200 with
```
{
status: "OK",
}
```
OR return code 403:
* If token for authenticating is wrong, you get
```
{"detail":"Incorrect authentication credentials."}
```
* If token that is being verified is wrong, you get
```
{"detail":"You do not have permission to perform this action."}
```
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## Authorize the request ##
From the ungleichotp-server, you get a validated information that a
name on a realm authenticated successfully. The associated permissions
("authorization") is application specific and needs to be decided by
your application.
## Limitations ##
* Name, Realm and seed are hard coded to 128 bytes length.
This can be changed, if necessary.
* Only python3 support for ungleichotp
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## TODOs
- [x] (server) Serialize / input request
- [x] (server) Make seed read only
- [x] (server) Implement registering of new entries
- [x] (server) OTPSerializer: allow to read seed for admin
- [x] (server) Implement deleting entry
- [x] (server) Include verify in ModelSerializer
- [x] (server) Map name+realm == User (?)
- name == name@realm
- password is used for admin login (?)
- seed
- custom auth method
- [n] (server) Try to fake username for django based on name+realm (?)
- No need
- [n] (server) maybe overwrite get_username()
- No need
- [x] (server) Use Custom authentication - needs to have a user!
- [x] (server) Implement creating new "User" by POST / Model based
- [n] (server) Remove hard coded JSON in /verify (no - good enough for the moment)
- [x] (server) Fully rename server from ungleichotp to ungleichotpserver
- [x] (security) Ensure that only the right realms can verify
- [x] (security) Ensure that only the right realms can manage
- [ ] (doc) Add proper documentation
- [ ] (server) Add tests for verify
- [ ] (server) Add tests for authentication
- [ ] (server) move totp constants into settings
- [ ] (server) move field lengths into settings
- [ ] (server) Document how admin vs. rest works
- [ ] (server, client) Make settings adjustable by environment - k8s/docker compatible
- [ ] (server, client) Read DB from outside (?) (fallback to sqlite)
- [x] (client) Establish auth using urllib
- [ ] (client) Bootstrap Django + DRF (including an object for CRUD)
- [ ] (client) Add custom authentication / remote auth
- [ ] (client) Show case: any realm vs. specific realm
- [x] (library) Write a "client library" that can use ungleichotp
- [x] (library) extract generic parts from server
- [ ] (library) upload to pypi
## Changelog
### 0.8, 2019-02-08
* Verify needed to call super()
4 years ago
### 0.6, 2018-11-18
* Reuse TokenSerializer for VerifySerializer logic
### 0.5, 2018-11-18
* Require authentication on all rest endpoints by token