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-rw-r--r--gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py89
-rw-r--r--gn_auth/auth/authentication/oauth2/server.py6
-rw-r--r--gn_auth/auth/authentication/users.py4
3 files changed, 99 insertions, 0 deletions
diff --git a/gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py b/gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py
new file mode 100644
index 0000000..492009c
--- /dev/null
+++ b/gn_auth/auth/authentication/oauth2/grants/jwt_bearer_grant.py
@@ -0,0 +1,89 @@
+"""JWT as Authorisation Grant"""
+import uuid
+from urllib.parse import urlparse
+from datetime import datetime, timedelta
+
+from flask import request, current_app as app
+
+from authlib.jose import jwt
+from authlib.jose.rfc7517.key_set import KeySet
+from authlib.oauth2.rfc7523.jwt_bearer import JWTBearerGrant as _JWTBearerGrant
+from authlib.oauth2.rfc7523.token import (
+ JWTBearerTokenGenerator as _JWTBearerTokenGenerator)
+
+from gn_auth.auth.authentication.users import user_by_id
+from gn_auth.auth.db.sqlite3 import connection, with_db_connection
+from gn_auth.auth.authentication.oauth2.models.oauth2client import client
+from gn_auth.auth.authentication.oauth2.grants.authorisation_code_grant import AuthorisationCodeGrant
+
+
+class JWTBearerTokenGenerator(_JWTBearerTokenGenerator):
+ """
+ A JSON Web Token formatted bearer token generator for jwt-bearer grant type.
+ """
+
+ DEFAULT_EXPIRES_IN = 300
+
+ def get_token_data(self, grant_type, client, expires_in=300, user=None, scope=None):
+ """Post process data to prevent JSON serialization problems."""
+ tokendata = super().get_token_data(
+ grant_type, client, expires_in, user, scope)
+ return {
+ **{
+ key: str(value) if key.endswith("_id") else value
+ for key, value in tokendata.items()
+ },
+ "sub": str(tokendata["sub"])}
+
+
+class JWTBearerGrant(_JWTBearerGrant, AuthorisationCodeGrant):
+ """Implement JWT as Authorisation Grant."""
+
+
+ def create_authorization_response(self, redirect_uri: str, grant_user):
+ resp = super().create_authorization_response(redirect_uri, grant_user)
+ headers = dict(resp[2])
+ location = urlparse(headers["Location"])
+ query = {
+ key.strip(): value.strip() for key, value in
+ (item.split("=") for item in
+ (param.strip() for param in location.query.split("&")))}
+ parsed_redirect = urlparse(redirect_uri)
+ issued = datetime.now()
+ jwtkey = app.config["JWT_PRIVATE_KEY"]
+ jwttoken = jwt.encode(
+ {"alg": "RS256", "typ": "jwt", "kid": jwtkey.kid},
+ {
+ "iss": str(self.client.client_id),
+ "sub": str(grant_user.user_id),
+ "aud": f"{parsed_redirect.scheme}://{parsed_redirect.netloc}",
+ "exp": (issued + timedelta(minutes=5)),
+ "nbf": int(issued.timestamp()),
+ "iat": int(issued.timestamp()),
+ "jti": str(uuid.uuid4()),
+ "code": query["code"]},
+ jwtkey).decode("utf8")
+ return (302, "", [("Location", f"{location.geturl()}&jwt={jwttoken}")])
+
+
+ def resolve_issuer_client(self, issuer):
+ """Fetch client via "iss" in assertion claims."""
+ return with_db_connection(
+ lambda conn: self.server.query_client(issuer))
+
+
+ def resolve_client_key(self, client, headers, payload):
+ """Resolve client key to decode assertion data."""
+ return app.config["JWT_PUBLIC_KEY"]
+
+
+ def authenticate_user(self, subject):
+ """Authenticate user with the given assertion claims."""
+ return with_db_connection(lambda conn: user_by_id(conn, subject))
+
+
+ def has_granted_permission(self, client, user):
+ """
+ Check if the client has permission to access the given user's resource.
+ """
+ return True # TODO: Check this!!!
diff --git a/gn_auth/auth/authentication/oauth2/server.py b/gn_auth/auth/authentication/oauth2/server.py
index 0bce3d3..09a3449 100644
--- a/gn_auth/auth/authentication/oauth2/server.py
+++ b/gn_auth/auth/authentication/oauth2/server.py
@@ -14,6 +14,7 @@ from .models.oauth2token import OAuth2Token, save_token
from .grants.password_grant import PasswordGrant
from .grants.authorisation_code_grant import AuthorisationCodeGrant
+from .grants.jwt_bearer_grant import JWTBearerGrant, JWTBearerTokenGenerator
from .endpoints.revocation import RevocationEndpoint
from .endpoints.introspection import IntrospectionEndpoint
@@ -59,6 +60,11 @@ def setup_oauth2_server(app: Flask) -> None:
# below
server.register_grant(AuthorisationCodeGrant)
+ server.register_grant(JWTBearerGrant)
+ server.register_token_generator(
+ "urn:ietf:params:oauth:grant-type:jwt-bearer",
+ JWTBearerTokenGenerator(app.config["JWT_PRIVATE_KEY"]))
+
# register endpoints
server.register_endpoint(RevocationEndpoint)
server.register_endpoint(IntrospectionEndpoint)
diff --git a/gn_auth/auth/authentication/users.py b/gn_auth/auth/authentication/users.py
index cb6a68e..1f364b8 100644
--- a/gn_auth/auth/authentication/users.py
+++ b/gn_auth/auth/authentication/users.py
@@ -17,6 +17,10 @@ class User:
email: str
name: str
+ def get_user_id(self):
+ """Get the user's ID."""
+ return self.user_id
+
DUMMY_USER = User(user_id=UUID("a391cf60-e8b7-4294-bd22-ddbbda4b3530"),
email="gn3@dummy.user",