A Django app for for generating secure scoped access tokens.
django-access-tokens is a Django app for generating secure scoped access tokens.
- Generate secure access tokens that grant permissions at the level of model instances, models, apps, or globally.
- Expire access tokens after a given age.
- Generate more compact access tokens by including 'django.contrib.auth' and 'django.contrib.contenttypes' in your project.
- Checkout the latest django-access-tokens release and copy or symlink the access_tokens directory into your PYTHONPATH. If using pip, run pip install django-access-tokens.
- Add 'access_tokens' to your INSTALLED_APPS setting.
- Optionally, ad 'django.contrib.auth' and 'django.contrib.contenttypes' for more compact access tokens.
Tokens can be generated as follows:
tokens.generate(scope=(), key=None, salt=None)
Some examples of token generation:
from access_tokens import scope, tokens # Generate an access token granting change permission on a given model instance. change_instance_token = tokens.generate( scope.access_obj(your_instance, "your_app.change_your_model"), ) # Generate an access token granting add permission on a given model. change_model_token = tokens.generate( scope.access_model(YourModel, "your_app.add_your_model"), ) # Generate an access token for a custom 'publish' permission on a given app. publish_app_token = tokens.generate( scope.access_app("your_app", "publish"), ) # Generate an access token for a custom 'moderate' permission globally. publish_app_token = tokens.generate( scope.access_all("moderate"), ) # Generate a complex token that grants a number of permissions. kitchen_sink_token = tokens.generate( scope.access_obj(your_instance, "read", "write") + scope.access_all("publish", "moderate") )
Some things to bear in mind when generating tokens:
- You can combine multiple scope.access_* invocations using the addition + operator.
- Permissions are specified as strings, and you can name as many permissions as you want in a given scope.access_* invocation.
- Permission names don’t have to match permissions defined by 'django.contrib.auth'. If they do match, then the generated access token will be smaller.
- If you don’t name any permissions in a scope.access_* call, then the returned scope is effectively worthless, as it grants no permissions.
Tokens can be validated as follows:
tokens.validate(token, scope=(), key=None, salt=None, max_age=None)
Some examples of token validation:
from access_tokens import scope, tokens # See if the given token grants 'publish' permission on the given app. tokens.validate( some_token, scope.access_app("your_app", "publish"), ) # Test the above token again, but only allow tokens generated in the last five minutes. tokens.validate( some_token, scope.access_app("your_app", "publish"), max_age = 60 * 5, )
Some things to bear in mind when validating tokens:
- A token is considered valid if it grants a superset of the permissions specified in the comparison scope.
- Tokens, by default, never expire, but you can force an expiry by passing a max_age argument to tokens.validate.
- Token validation should only raise an exception if the code used to generate it was faulty. A bad signature on an access token, or an expired max_age, will not raise an exception, but will instead simply fail validation and return False.
django-access-tokens generates access tokens by serializing a representation of the granted permissions and then signing it using django.core.signing. As such, it uses the latest cryptographic techniques developed by the core Django team, and will stay up-to-date as you upgrade Django.
In order for django-access-tokens to work, it is important that you keep the secret key used to generate the tokens a secret. By default, tokens are generated using settings.SECRET_KEY. If you ever believe that your secret key has been compromised, change it immediately. Changing your secret key will also immediately invalidate all access tokens generated from it.
The django-access-tokens project was developed at Mohawk, and is released as Open Source under the MIT license.
You can get the code from the django-access-tokens project site.
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