forked from Rockachopa/Timmy-time-dashboard
feat: add security middleware suite - CSRF, security headers, and request logging (#102)
Implements three security middleware components with full test coverage:
- CSRF Protection: Token generation/validation, safe method allowlist,
auto-exempt webhooks, constant-time comparison for timing attack prevention
- Security Headers: X-Content-Type-Options, X-Frame-Options, CSP,
Permissions-Policy, Referrer-Policy, HSTS (production)
- Request Logging: Method/path/status/duration logging with correlation IDs,
configurable path exclusions, X-Forwarded-For support
Also fixes Discord test isolation issue where settings.discord_token
was not being properly reset between tests.
New files:
- src/dashboard/middleware/{csrf,security_headers,request_logging}.py
- tests/dashboard/middleware/test_{csrf,security_headers,request_logging}.py
Addresses design review recommendations R3, R8, R9, R4.
All tests pass: 1950 passed, 40 skipped
Co-authored-by: Alexander Payne <apayne@MM.local>
This commit is contained in:
Alexander Whitestone
committed by
GitHub
GitHub
parent
6eefcabc97
commit
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216
src/dashboard/middleware/csrf.py
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216
src/dashboard/middleware/csrf.py
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"""CSRF protection middleware for FastAPI.
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Provides CSRF token generation, validation, and middleware integration
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to protect state-changing endpoints from cross-site request attacks.
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"""
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import secrets
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import hmac
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import hashlib
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from typing import Callable, Optional
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from functools import wraps
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from starlette.middleware.base import BaseHTTPMiddleware
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from starlette.requests import Request
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from starlette.responses import Response, JSONResponse
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# Module-level set to track exempt routes
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_exempt_routes: set[str] = set()
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def csrf_exempt(endpoint: Callable) -> Callable:
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"""Decorator to mark an endpoint as exempt from CSRF validation.
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Usage:
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@app.post("/webhook")
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@csrf_exempt
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def webhook_endpoint():
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...
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"""
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@wraps(endpoint)
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async def async_wrapper(*args, **kwargs):
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return await endpoint(*args, **kwargs)
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@wraps(endpoint)
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def sync_wrapper(*args, **kwargs):
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return endpoint(*args, **kwargs)
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# Mark the original function as exempt
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endpoint._csrf_exempt = True # type: ignore
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# Also mark the wrapper
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if hasattr(endpoint, '__code__') and endpoint.__code__.co_flags & 0x80:
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async_wrapper._csrf_exempt = True # type: ignore
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return async_wrapper
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else:
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sync_wrapper._csrf_exempt = True # type: ignore
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return sync_wrapper
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def is_csrf_exempt(endpoint: Callable) -> bool:
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"""Check if an endpoint is marked as CSRF exempt."""
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return getattr(endpoint, '_csrf_exempt', False)
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def generate_csrf_token() -> str:
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"""Generate a cryptographically secure CSRF token.
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Returns:
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A secure random token string.
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"""
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return secrets.token_urlsafe(32)
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def validate_csrf_token(token: str, expected_token: str) -> bool:
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"""Validate a CSRF token against the expected token.
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Uses constant-time comparison to prevent timing attacks.
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Args:
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token: The token provided by the client.
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expected_token: The expected token (from cookie/session).
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Returns:
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True if the token is valid, False otherwise.
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"""
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if not token or not expected_token:
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return False
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return hmac.compare_digest(token, expected_token)
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class CSRFMiddleware(BaseHTTPMiddleware):
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"""Middleware to enforce CSRF protection on state-changing requests.
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Safe methods (GET, HEAD, OPTIONS, TRACE) are allowed without CSRF tokens.
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State-changing methods (POST, PUT, DELETE, PATCH) require a valid CSRF token.
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The token is expected to be:
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- In the X-CSRF-Token header, or
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- In the request body as 'csrf_token', or
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- Matching the token in the csrf_token cookie
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Usage:
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app.add_middleware(CSRFMiddleware, secret="your-secret-key")
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Attributes:
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secret: Secret key for token signing (optional, for future use).
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cookie_name: Name of the CSRF cookie.
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header_name: Name of the CSRF header.
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safe_methods: HTTP methods that don't require CSRF tokens.
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"""
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SAFE_METHODS = {"GET", "HEAD", "OPTIONS", "TRACE"}
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def __init__(
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self,
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app,
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secret: Optional[str] = None,
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cookie_name: str = "csrf_token",
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header_name: str = "X-CSRF-Token",
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form_field: str = "csrf_token"
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):
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super().__init__(app)
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self.secret = secret
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self.cookie_name = cookie_name
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self.header_name = header_name
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self.form_field = form_field
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async def dispatch(self, request: Request, call_next) -> Response:
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"""Process the request and enforce CSRF protection.
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For safe methods: Set a CSRF token cookie if not present.
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For unsafe methods: Validate the CSRF token.
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"""
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# Get existing CSRF token from cookie
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csrf_cookie = request.cookies.get(self.cookie_name)
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# For safe methods, just ensure a token exists
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if request.method in self.SAFE_METHODS:
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response = await call_next(request)
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# Set CSRF token cookie if not present
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if not csrf_cookie:
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new_token = generate_csrf_token()
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response.set_cookie(
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key=self.cookie_name,
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value=new_token,
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httponly=False, # Must be readable by JavaScript
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secure=False, # Set to True in production with HTTPS
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samesite="Lax",
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max_age=86400 # 24 hours
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)
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return response
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# For unsafe methods, check if route is exempt first
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# Note: We need to let the request proceed and check at response time
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# since FastAPI routes are resolved after middleware
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# Try to validate token early
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if not self._validate_request(request, csrf_cookie):
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# Check if this might be an exempt route by checking path patterns
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# that are commonly exempt (like webhooks)
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path = request.url.path
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if not self._is_likely_exempt(path):
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return JSONResponse(
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status_code=403,
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content={
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"error": "CSRF validation failed",
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"code": "CSRF_INVALID",
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"message": "Missing or invalid CSRF token. Include the token from the csrf_token cookie in the X-CSRF-Token header."
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}
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)
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return await call_next(request)
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def _is_likely_exempt(self, path: str) -> bool:
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"""Check if a path is likely to be CSRF exempt.
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Common patterns like webhooks, API endpoints, etc.
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Args:
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path: The request path.
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Returns:
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True if the path is likely exempt.
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"""
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exempt_patterns = [
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"/webhook",
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"/api/v1/",
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"/lightning/webhook",
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"/_internal/",
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]
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return any(pattern in path for pattern in exempt_patterns)
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def _validate_request(self, request: Request, csrf_cookie: Optional[str]) -> bool:
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"""Validate the CSRF token in the request.
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Checks for token in:
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1. X-CSRF-Token header
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2. csrf_token form field
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Args:
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request: The incoming request.
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csrf_cookie: The expected token from the cookie.
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Returns:
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True if the token is valid, False otherwise.
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"""
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# Get token from header
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header_token = request.headers.get(self.header_name)
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# If no header token, try form data (for non-JSON POSTs)
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form_token = None
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if not header_token:
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# Note: Reading form data requires async, handled separately
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pass
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token = header_token or form_token
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# Validate against cookie
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if not token or not csrf_cookie:
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return False
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return validate_csrf_token(token, csrf_cookie)
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