sanic-security 1.4.11

An effective, simple, and async security library for the Sanic framework.

Sanic Security

An effective, simple, and async security library for the Sanic framework.

Table of Contents

• About the Project
• Getting Started
  • Prerequisites
  • Installation
  • Configuration
• Usage
  • Authentication
  • Captcha
  • Two Step Verification
  • Authorization
  • Testing
  • Tortoise
• Contributing
• License
• Versioning

About The Project

Sanic Security is an authentication, authorization, and verification library designed for use with Sanic. This library contains a variety of features including:

• Login, registration, and authentication (including access/refresh tokens)
• Two-factor authentication
• Two-step verification
• Captcha
• Role based authorization with wildcard permissions

This repository has been starred by Sanic's core maintainer:

Please visit security.sunsetdeveloper.com for documentation.

Getting Started

In order to get started, please install pip.

Prerequisites

• pip

sudo apt-get install python3-pip

Installation

• Install the Sanic Security pip package.

pip3 install sanic-security

• Install the Sanic Security pip package with the cryptography dependency included.

If you are planning on encoding or decoding JWTs using certain digital signature algorithms (like RSA or ECDSA which use the public secret and private secret), you will need to install the cryptography library. This can be installed explicitly, or as a required extra in the sanic-security requirement.

pip3 install sanic-security[crypto]

• For developers, fork Sanic Security and install development dependencies.

pip3 install -e ".[dev]"

Configuration

Sanic Security configuration is merely an object that can be modified either using dot-notation or like a dictionary.

For example:

from sanic_security.configuration import config

config.SECRET = "This is a big secret. Shhhhh"
config["CAPTCHA_FONT"] = "./resources/captcha.ttf"

You can also use the update() method like on regular dictionaries.

Any environment variables defined with the SANIC_SECURITY_ prefix will be applied to the config. For example, setting SANIC_SECURITY_SECRET will be loaded by the application automatically and fed into the SECRET config variable.

You can load environment variables with a different prefix via calling the config.load_environment_variables("NEW_PREFIX_") method.

• Default configuration values:

Key	Value	Description
SECRET	This is a big secret. Shhhhh	The secret used for generating and signing JWTs. This should be a string unique to your application. Keep it safe.
PUBLIC_SECRET	None	The secret used for verifying and decoding JWTs and can be publicly shared. This should be a string unique to your application.
CACHE	./security-cache	The path used for caching.
SESSION_SAMESITE	strict	The SameSite attribute of session cookies.
SESSION_SECURE	False	The Secure attribute of session cookies.
SESSION_HTTPONLY	True	The HttpOnly attribute of session cookies. HIGHLY recommended that you do not turn this off, unless you know what you are doing.
SESSION_DOMAIN	None	The Domain attribute of session cookies.
SESSION_EXPIRES_ON_CLIENT	False	When true, session cookies are removed from the clients browser when the session expires.
SESSION_ENCODING_ALGORITHM	HS256	The algorithm used to encode and decode session JWTs.
SESSION_PREFIX	token	Prefix attached to the beginning of session cookies.
MAX_CHALLENGE_ATTEMPTS	5	The maximum amount of session challenge attempts allowed.
CAPTCHA_SESSION_EXPIRATION	60	The amount of seconds till captcha session expiration on creation. Setting to 0 will disable expiration.
CAPTCHA_FONT	captcha.ttf	The file path to the font being used for captcha generation.
TWO_STEP_SESSION_EXPIRATION	200	The amount of seconds till two step session expiration on creation. Setting to 0 will disable expiration.
AUTHENTICATION_SESSION_EXPIRATION	2692000	The amount of seconds till authentication session expiration on creation. Setting to 0 will disable expiration.
ALLOW_LOGIN_WITH_USERNAME	False	Allows login via username and email.
INITIAL_ADMIN_EMAIL	[e-mail]	Email used when generating the initial admin account.
INITIAL_ADMIN_PASSWORD	admin123	Password used when generating the initial admin account.
TEST_DATABASE_URL	sqlite://:memory:	Database URL for connecting to the database Sanic Security will use for testing.

Usage

Sanic Security's authentication and verification functionality is session based.

A new session will be created for the user after the user logs in or requests some form of verification (two-step, captcha). The session data is then encoded into a JWT and stored on a cookie on the user’s browser. The session cookie would be sent along with every subsequent request. The server can then compare the session stored on the cookie against the session information stored in the database to verify user’s identity and send a response with the corresponding state.

The tables in the below examples represent example request form-data (https://sanicframework.org/en/guide/basics/request.html#form).

Authentication

• Initial Admin Generation

The initial admin account is generated on startup, can be logged into, and has complete authoritative access. The credentials for this account are set via config.

generate_initial_admin(app)
if __name__ == "__main__":
    app.run(host="127.0.0.1", port=8000)

• Registration

Phone can be null or empty.

Key	Value
username	example
email	[e-mail]
phone	19811354186
password	testpass
captcha	Aj8HgD

@app.post("api/auth/register")
@requires_captcha()
async def on_register(request, captcha_session):
    account = await register(request)
    two_step_session = await request_two_step_verification(request, account)
    await email_code(
        two_step_session.code
    )  # Custom method for emailing verification code.
    response = json("Registration successful!", two_step_session.bearer.json())
    two_step_session.encode(response)
    return response

• Verify Account

Key	Value
code	G8ha9nVae

@app.post("api/auth/verify")
async def on_verify(request):
    two_step_session = await verify_account(request)
    return json(
        "You have verified your account and may login!", two_step_session.bearer.json()
    )

• Login

Login credentials are retrieved via the Authorization header. Credentials are constructed by first combining the username and the password with a colon (aladdin:opensesame), and then by encoding the resulting string in base64 (YWxhZGRpbjpvcGVuc2VzYW1l). Here is an example authorization header: Authorization: Basic YWxhZGRpbjpvcGVuc2VzYW1l.

You can use a username as well as an email for login if ALLOW_LOGIN_WITH_USERNAME is true in the config.

@app.post("api/auth/login")
async def on_login(request):
    authentication_session = await login(request)
    response = json("Login successful!", authentication_session.bearer.json())
    authentication_session.encode(response)
    return response

• Login (With two-factor authentication)

@app.post("api/auth/login")
async def on_two_factor_login(request):
    authentication_session = await login(request, two_factor=True)
    two_step_session = await request_two_step_verification(
        request, authentication_session.bearer
    )
    await email_code(
        two_step_session.code
    )  # Custom method for emailing verification code.
    response = json(
        "Login successful! A second factor is now required to be authenticated.",
        authentication_session.bearer.json(),
    )
    authentication_session.encode(response)
    two_step_session.encode(response)
    return response

• Second Factor

Key	Value
code	G8ha9nVae

@app.post("api/auth/login/second-factor")
@requires_two_step_verification()
async def on_login_second_factor(request, two_step_session):
    authentication_session = await on_second_factor(request)
    response = json(
        "Second factor attempt successful! You may now be authenticated!",
        authentication_session.bearer.json(),
    )
    return response

• Logout

@app.post("api/auth/logout")
@requires_authentication()
async def on_logout(request, authentication_session):
    await logout(authentication_session)
    response = json("Logout successful!", authentication_session.bearer.json())
    return response

• Refresh Authentication

A refresh token is used that lets the client retrieve a new authentication session without having to ask the user to log in again.

@app.post("api/auth/refresh")
async def on_refresh(request):
    refreshed_authentication_session = await refresh_authentication(request)
    response = json(
        "Authentication session refreshed!",
        refreshed_authentication_session.bearer.json(),
    )
    refreshed_authentication_session.encode(response)
    return response

• Requires Authentication

@app.post("api/auth")
@requires_authentication()
async def on_authenticated(request, authentication_session):
    return json(
        f"Hello {authentication_session.bearer.username}! You have been authenticated.",
        authentication_session.bearer.json(),
    )

Captcha

You must download a .ttf font for captcha challenges and define the file's path in the configuration.

1001 Free Fonts

Recommended Font

Captcha challenge example:

• Request Captcha

@app.get("api/captcha")
async def on_request_captcha(request):
    captcha_session = await request_captcha(request)
    response = await captcha_session.get_image()
    captcha_session.encode(response)
    return response

• Requires Captcha

Key	Value
captcha	Aj8HgD

@app.post("api/captcha")
@requires_captcha()
async def on_captcha_attempt(request, captcha_session):
    return json("Captcha attempt successful!", captcha_session.json())

Two-step Verification

• Request Two-step Verification

Key	Value
email	[e-mail]
captcha	Aj8HgD

@app.post("api/verification/request")
@requires_captcha()
async def on_request_verification(request, captcha_session):
    two_step_session = await request_two_step_verification(request)
    await email_code(
        two_step_session.code
    )  # Custom method for emailing verification code.
    response = json("Verification request successful!", two_step_session.bearer.json())
    two_step_session.encode(response)
    return response

• Resend Two-step Verification Code

@app.post("api/verification/resend")
async def on_resend_verification(request):
    two_step_session = await TwoStepSession.decode(request)
    await email_code(
        two_step_session.code
    )  # Custom method for emailing verification code.
    return json("Verification code resend successful!", two_step_session.bearer.json())

• Requires Two-step Verification

Key	Value
code	G8ha9nVa

@app.post("api/verification")
@requires_two_step_verification()
async def on_verification(request, two_step_session):
    response = json(
        "Two-step verification attempt successful!", two_step_session.bearer.json()
    )
    return response

Authorization

Sanic Security uses role based authorization with wildcard permissions.

Roles are created for various job functions. The permissions to perform certain operations are assigned to specific roles. Users are assigned particular roles, and through those role assignments acquire the permissions needed to perform particular system functions. Since users are not assigned permissions directly, but only acquire them through their role (or roles), management of individual user rights becomes a matter of simply assigning appropriate roles to the user's account; this simplifies common operations, such as adding a user, or changing a user's department.

Wildcard permissions support the concept of multiple levels or parts. For example, you could grant a user the permission printer:query, printer:query,delete, or printer:*. Inspired by Apache Shiro.

• Assign Role

await assign_role(
    "Chat Room Moderator",
    "Can read and delete messages in all chat rooms, suspend and mute accounts, and control voice chat.",
    "channels:view,delete, account:suspend,mute, voice:*",
    account,
)

• Require Permissions

@app.post("api/channel/view")
@require_permissions("channels:view", "voice:*")
async def on_voice_chat_control(request, authentication_session):
    return text("Voice chat is now being controlled.")

• Require Roles

@app.post("api/account/suspend")
@require_roles("Chat Room Moderator")
async def on_suspend_account(request, authentication_session):
    return text("Account successfully suspended.")

Testing

• Set the TEST_DATABASE_URL configuration value.

• Make sure the test Sanic instance (test/server.py) is running on your machine.

• Run the unit test client (test/tests.py) for results.

Tortoise

Sanic Security uses Tortoise ORM for database operations.

Tortoise ORM is an easy-to-use asyncio ORM (Object Relational Mapper).

• Initialise your models and database like so:

async def init():
    await Tortoise.init(
        db_url="sqlite://db.sqlite3",
        modules={"models": ["sanic_security.models", "app.models"]},
    )
    await Tortoise.generate_schemas()

or

register_tortoise(
    app,
    db_url="sqlite://db.sqlite3",
    modules={"models": ["sanic_security.models", "app.models"]},
    generate_schemas=True,
)

• Define your models like so:

from tortoise.models import Model
from tortoise import fields


class Tournament(Model):
    id = fields.IntField(pk=True)
    name = fields.TextField()

• Use it like so:

# Create instance by save
tournament = Tournament(name="New Tournament")
await tournament.save()

# Or by .create()
await Tournament.create(name="Another Tournament")

# Now search for a record
tour = await Tournament.filter(name__contains="Another").first()
print(tour.name)

Support for SQLAlchemy and more coming soon.

Contributing

Contributions are what make the open source community such an amazing place to be learn, inspire, and create. Any contributions you make are greatly appreciated.

1. Fork the Project
2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
3. Commit your Changes (git commit -m 'Add some AmazingFeature')
4. Push to the Branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

License

Distributed under the GNU Affero General Public License v3.0. See LICENSE for more information.

Versioning

0.0.0

• MAJOR version when you make incompatible API changes.

• MINOR version when you add functionality in a backwards compatible manner.

• PATCH version when you make backwards compatible bug fixes.

https://semver.org/