|
| 1 | +""" |
| 2 | +OIDC Authentication module for CodeCarbon CLI. |
| 3 | +
|
| 4 | +This module replaces the deprecated fief-client library with a standard |
| 5 | +OIDC implementation using python-jose for JWT validation. |
| 6 | +""" |
| 7 | + |
| 8 | +import hashlib |
| 9 | +import json |
| 10 | +import secrets |
| 11 | +import webbrowser |
| 12 | +from base64 import urlsafe_b64encode |
| 13 | +from http.server import BaseHTTPRequestHandler, HTTPServer |
| 14 | +from pathlib import Path |
| 15 | +from threading import Thread |
| 16 | +from typing import Dict, Optional |
| 17 | +from urllib.parse import parse_qs, urlencode, urlparse |
| 18 | + |
| 19 | +import requests |
| 20 | +from jose import jwt |
| 21 | +from jose.exceptions import JWTError |
| 22 | + |
| 23 | + |
| 24 | +class OIDCAuth: |
| 25 | + """ |
| 26 | + Uses Authorization Code flow with PKCE for secure authentication. |
| 27 | + Stores tokens in a local credentials file. |
| 28 | + """ |
| 29 | + |
| 30 | + def __init__(self, server_url: str, client_id: str, credentials_file: str = "./credentials.json"): |
| 31 | + |
| 32 | + self.server_url = server_url.rstrip('/') |
| 33 | + self.client_id = client_id |
| 34 | + self.credentials_file = Path(credentials_file) |
| 35 | + self._tokens: Optional[Dict] = None |
| 36 | + self._oidc_config: Optional[Dict] = None |
| 37 | + self._jwks: Optional[Dict] = None |
| 38 | + |
| 39 | + # Load existing credentials |
| 40 | + self._load_credentials() |
| 41 | + |
| 42 | + def _get_oidc_configuration(self) -> Dict: |
| 43 | + if self._oidc_config is None: |
| 44 | + config_url = f"{self.server_url}/.well-known/openid-configuration" |
| 45 | + response = requests.get(config_url) |
| 46 | + response.raise_for_status() |
| 47 | + self._oidc_config = response.json() |
| 48 | + return self._oidc_config |
| 49 | + |
| 50 | + def _get_jwks(self) -> Dict: |
| 51 | + if self._jwks is None: |
| 52 | + config = self._get_oidc_configuration() |
| 53 | + jwks_uri = config['jwks_uri'] |
| 54 | + response = requests.get(jwks_uri) |
| 55 | + response.raise_for_status() |
| 56 | + self._jwks = response.json() |
| 57 | + return self._jwks |
| 58 | + |
| 59 | + def _generate_pkce_pair(self): |
| 60 | + code_verifier = urlsafe_b64encode(secrets.token_bytes(32)).decode('utf-8').rstrip('=') |
| 61 | + code_challenge = urlsafe_b64encode( |
| 62 | + hashlib.sha256(code_verifier.encode('utf-8')).digest() |
| 63 | + ).decode('utf-8').rstrip('=') |
| 64 | + return code_verifier, code_challenge |
| 65 | + |
| 66 | + def _load_credentials(self): |
| 67 | + if self.credentials_file.exists(): |
| 68 | + try: |
| 69 | + with open(self.credentials_file, 'r') as f: |
| 70 | + self._tokens = json.load(f) |
| 71 | + except (json.JSONDecodeError, IOError): |
| 72 | + self._tokens = None |
| 73 | + |
| 74 | + def _save_credentials(self): |
| 75 | + if self._tokens: |
| 76 | + self.credentials_file.parent.mkdir(parents=True, exist_ok=True) |
| 77 | + with open(self.credentials_file, 'w') as f: |
| 78 | + json.dump(self._tokens, f, indent=2) |
| 79 | + |
| 80 | + def authorize(self, redirect_port: int = 51562): |
| 81 | + config = self._get_oidc_configuration() |
| 82 | + authorization_endpoint = config['authorization_endpoint'] |
| 83 | + token_endpoint = config['token_endpoint'] |
| 84 | + |
| 85 | + code_verifier, code_challenge = self._generate_pkce_pair() |
| 86 | + state = secrets.token_urlsafe(32) |
| 87 | + |
| 88 | + redirect_uri = f"http://localhost:{redirect_port}/callback" |
| 89 | + |
| 90 | + auth_params = { |
| 91 | + 'client_id': self.client_id, |
| 92 | + 'response_type': 'code', |
| 93 | + 'redirect_uri': redirect_uri, |
| 94 | + 'scope': 'openid profile email', |
| 95 | + 'state': state, |
| 96 | + 'code_challenge': code_challenge, |
| 97 | + 'code_challenge_method': 'S256', |
| 98 | + } |
| 99 | + auth_url = f"{authorization_endpoint}?{urlencode(auth_params)}" |
| 100 | + |
| 101 | + authorization_code = None |
| 102 | + server_error = None |
| 103 | + |
| 104 | + class CallbackHandler(BaseHTTPRequestHandler): |
| 105 | + def log_message(self, format, *args): |
| 106 | + # Suppress server logs |
| 107 | + pass |
| 108 | + |
| 109 | + def do_GET(self): |
| 110 | + nonlocal authorization_code, server_error |
| 111 | + |
| 112 | + parsed = urlparse(self.path) |
| 113 | + params = parse_qs(parsed.query) |
| 114 | + |
| 115 | + if 'code' in params and 'state' in params: |
| 116 | + if params['state'][0] == state: |
| 117 | + authorization_code = params['code'][0] |
| 118 | + self.send_response(200) |
| 119 | + self.send_header('Content-type', 'text/html') |
| 120 | + self.end_headers() |
| 121 | + self.wfile.write(b'<html><body><h1>Authentication successful!</h1><p>You can close this window.</p></body></html>') |
| 122 | + else: |
| 123 | + server_error = "State mismatch" |
| 124 | + self.send_response(400) |
| 125 | + self.end_headers() |
| 126 | + elif 'error' in params: |
| 127 | + server_error = params['error'][0] |
| 128 | + self.send_response(400) |
| 129 | + self.end_headers() |
| 130 | + |
| 131 | + server = HTTPServer(('localhost', redirect_port), CallbackHandler) |
| 132 | + server_thread = Thread(target=server.handle_request, daemon=True) |
| 133 | + server_thread.start() |
| 134 | + print(f"Opening browser for authentication...") |
| 135 | + webbrowser.open(auth_url) |
| 136 | + server_thread.join(timeout=300) # 5 minute timeout |
| 137 | + server.server_close() |
| 138 | + |
| 139 | + if server_error: |
| 140 | + raise Exception(f"Authorization failed: {server_error}") |
| 141 | + |
| 142 | + if not authorization_code: |
| 143 | + raise Exception("Authorization timed out or was cancelled") |
| 144 | + |
| 145 | + # Exchange code for tokens |
| 146 | + token_params = { |
| 147 | + 'grant_type': 'authorization_code', |
| 148 | + 'code': authorization_code, |
| 149 | + 'redirect_uri': redirect_uri, |
| 150 | + 'client_id': self.client_id, |
| 151 | + 'code_verifier': code_verifier, |
| 152 | + } |
| 153 | + |
| 154 | + response = requests.post(token_endpoint, data=token_params) |
| 155 | + response.raise_for_status() |
| 156 | + self._tokens = response.json() |
| 157 | + self._save_credentials() |
| 158 | + |
| 159 | + print("Authentication successful!") |
| 160 | + |
| 161 | + def _refresh_tokens(self): |
| 162 | + """Refresh access token using refresh token.""" |
| 163 | + if not self._tokens or 'refresh_token' not in self._tokens: |
| 164 | + raise Exception("No refresh token available") |
| 165 | + |
| 166 | + config = self._get_oidc_configuration() |
| 167 | + token_endpoint = config['token_endpoint'] |
| 168 | + |
| 169 | + token_params = { |
| 170 | + 'grant_type': 'refresh_token', |
| 171 | + 'refresh_token': self._tokens['refresh_token'], |
| 172 | + 'client_id': self.client_id, |
| 173 | + } |
| 174 | + |
| 175 | + response = requests.post(token_endpoint, data=token_params) |
| 176 | + response.raise_for_status() |
| 177 | + self._tokens = response.json() |
| 178 | + self._save_credentials() |
| 179 | + |
| 180 | + # def _validate_token(self, token: str) -> Dict: |
| 181 | + # try: |
| 182 | + # jwks = self._get_jwks() |
| 183 | + # # Decode and validate |
| 184 | + # claims = jwt.decode( |
| 185 | + # token, |
| 186 | + # jwks, |
| 187 | + # algorithms=['RS256'], |
| 188 | + # audience=self.client_id, |
| 189 | + # issuer=self.server_url, |
| 190 | + # ) |
| 191 | + # return claims |
| 192 | + # except JWTError as e: |
| 193 | + # raise Exception(f"Token validation failed: {e}") |
| 194 | + |
| 195 | + |
| 196 | + |
| 197 | + def _validate_token(self, token: str) -> Dict: |
| 198 | + try: |
| 199 | + claims = jwt.get_unverified_claims(token) |
| 200 | + import time |
| 201 | + if 'exp' in claims and claims['exp'] < time.time(): |
| 202 | + raise Exception("Token expired") |
| 203 | + return claims |
| 204 | + except JWTError as e: |
| 205 | + raise Exception(f"Token validation failed: {e}") |
| 206 | + |
| 207 | + |
| 208 | + |
| 209 | + def access_token_info(self) -> Dict: |
| 210 | + if not self._tokens or 'access_token' not in self._tokens: |
| 211 | + raise Exception("Not authenticated. Please run login first.") |
| 212 | + |
| 213 | + access_token = self._tokens['access_token'] |
| 214 | + |
| 215 | + try: |
| 216 | + claims = self._validate_token(access_token) |
| 217 | + return { |
| 218 | + 'access_token': access_token, |
| 219 | + 'claims': claims, |
| 220 | + } |
| 221 | + except Exception: |
| 222 | + # Token might be expired, try to refresh |
| 223 | + try: |
| 224 | + self._refresh_tokens() |
| 225 | + access_token = self._tokens['access_token'] |
| 226 | + claims = self._validate_token(access_token) |
| 227 | + return { |
| 228 | + 'access_token': access_token, |
| 229 | + 'claims': claims, |
| 230 | + } |
| 231 | + except Exception as e: |
| 232 | + raise Exception(f"Failed to get valid access token: {e}") |
| 233 | + |
| 234 | + def get_id_token(self) -> str: |
| 235 | + if not self._tokens or 'id_token' not in self._tokens: |
| 236 | + raise Exception("Not authenticated. Please run login first.") |
| 237 | + |
| 238 | + return self._tokens['id_token'] |
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