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import time
import secrets
import hashlib
import base64
import jwt
import json
import urllib.parse
from flask import Blueprint, request, redirect, jsonify
from CTFd.utils.user import authed, get_current_user
from CTFd.models import Users
from CTFd.plugins import bypass_csrf_protection
from cryptography.hazmat.primitives import serialization
from .models import db, OIDCClient, OIDCAuthCode, OIDCRefreshToken, OIDCAccessToken, OIDCKey
from .crypto import sign_jwt
from .config import get_config
oidc_blueprint = Blueprint(
"oidc",
__name__,
url_prefix="/oidc"
)
@oidc_blueprint.route("/.well-known/openid-configuration")
def discovery():
issuer = get_config("base_url", "")
return jsonify({
"issuer": f"{issuer}/oidc/",
"authorization_endpoint": f"{issuer}/oidc/authorize",
"token_endpoint": f"{issuer}/oidc/token",
"userinfo_endpoint": f"{issuer}/oidc/userinfo",
"jwks_uri": f"{issuer}/oidc/jwks",
"response_types_supported": ["code"],
"grant_types_supported": ["authorization_code", "refresh_token"],
"code_challenge_methods_supported": ["S256"],
"token_endpoint_auth_methods_supported": ["client_secret_basic"],
"id_token_signing_alg_values_supported": ["RS256"],
"scopes_supported": ["openid", "profile", "email"], #TODO maybe support these for real
})
@oidc_blueprint.route("/jwks")
def jwks():
keys = []
for key in OIDCKey.query.all():
public_key = serialization.load_pem_public_key(key.public_pem.encode("utf-8"))
jwk = json.loads(jwt.algorithms.RSAAlgorithm.to_jwk(public_key))
jwk["kid"] = key.kid
keys.append(jwk)
return jsonify({"keys": keys})
@oidc_blueprint.route("/authorize")
def authorize():
if not authed():
return redirect(f"/login?next={urllib.parse.quote(request.full_path)}")
client_id = request.args.get("client_id")
redirect_uri = request.args.get("redirect_uri")
state = request.args.get("state")
code_challenge = request.args.get("code_challenge")
client = OIDCClient.query.filter_by(client_id=client_id).first()
if not client or redirect_uri not in str.splitlines(client.redirect_uris):
return "Invalid client", 400
if not code_challenge and client.pkce:
return "PKCE required", 400
code = secrets.token_urlsafe(32)
db.session.add(OIDCAuthCode(
code=code,
user_id=get_current_user().id,
client_id=client.client_id,
redirect_uri=redirect_uri,
code_challenge=code_challenge,
exp=int(time.time()) + 300,
))
db.session.commit()
return redirect(f"{redirect_uri}?code={code}&state={state}")
@oidc_blueprint.route("/token", methods=["POST"])
@bypass_csrf_protection
def token():
auth_header = request.headers.get("Authorization")
if not auth_header or not auth_header.startswith("Basic "):
return jsonify({"error": "invalid_client"}), 401
try:
b64 = auth_header.split(" ", 1)[1]
decoded = base64.b64decode(b64).decode("utf-8")
client_id, client_secret = decoded.split(":", 1)
except Exception:
return jsonify({"error": "invalid_client"}), 401
client = OIDCClient.query.filter_by(client_id=client_id).first()
if not client or client.client_secret != client_secret:
return jsonify({"error": "invalid_client"}), 401
issuer = get_config("base_url", "") + "/oidc/"
def create_tokens(thing):
user = thing.user
db.session.delete(thing)
now = int(time.time())
refresh_token = secrets.token_urlsafe(48)
db.session.add(OIDCRefreshToken(
refresh_token=refresh_token,
user_id=user.id,
client_id=client.client_id,
exp=now + 86400,
))
access_token = secrets.token_urlsafe(48)
db.session.add(OIDCAccessToken(
access_token=access_token,
user_id=user.id,
client_id=client.client_id,
exp=now + 3600,
))
db.session.commit()
id_token = sign_jwt(
{"sub": str(user.id), "email": user.email, "name": user.name},
issuer,
client.client_id,
)
return jsonify({
"access_token": access_token,
"id_token": id_token,
"refresh_token": refresh_token,
"token_type": "Bearer",
"expires_in": 3600,
})
if request.form["grant_type"] == "authorization_code":
code = request.form.get("code")
redirect_uri = request.form.get("redirect_uri")
authcode = OIDCAuthCode.query.filter_by(code=code, client_id=client.client_id, redirect_uri=redirect_uri).first()
if not authcode or authcode.exp < time.time():
return jsonify({"error": "invalid_grant"}), 400
if client.pkce:
verifier = request.form.get("code_verifier")
digest = hashlib.sha256(verifier.encode()).digest()
challenge = base64.urlsafe_b64encode(digest).rstrip(b"=").decode()
if challenge != authcode.code_challenge:
return jsonify({"error": "invalid_grant"}), 400
return create_tokens(authcode)
if request.form["grant_type"] == "refresh_token":
old_refresh = request.form["refresh_token"]
token = OIDCRefreshToken.query.filter_by(refresh_token=old_refresh, client_id=client.client_id).first()
if (not token or token.exp < time.time()):
return jsonify({"error": "invalid_grant"}), 400
return create_tokens(token)
return jsonify({"error": "unsupported_grant_type"}), 400
@oidc_blueprint.route("/userinfo")
def userinfo():
auth = request.headers.get("Authorization", "")
if not auth.startswith("Bearer "):
return jsonify({"error": "invalid_token"}), 401
access_token = auth.split(" ", 1)[1]
token = OIDCAccessToken.query.filter_by(access_token=access_token).first()
if not token or token.exp < time.time():
return jsonify({"error": "invalid_token"}), 401
user = Users.query.get(token.user_id)
if not user:
return jsonify({"error": "invalid_token"}), 401
team_id = None
team_name = None
if hasattr(user, "team") and user.team:
team_id = str(user.team.id)
team_name = user.team.name
return jsonify({
"sub": str(user.id),
"email": user.email,
"name": user.name,
"team_id": team_id,
"team_name": team_name,
})
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