This commit addresses multiple CRITICAL, HIGH, and MEDIUM severity security vulnerabilities identified in the security audit:
CRITICAL FIXES:
- Fix weak RNG for recovery codes - replaced Enum.random() with :crypto.strong_rand_bytes/1 for cryptographically secure token generation
- Fix subscription limit race conditions - moved free org and device quota checks inside transactions with FOR UPDATE locks to prevent concurrent bypass
- Fix default organization race condition - moved is_default check inside transaction to prevent multiple defaults per user
HIGH SEVERITY FIXES:
- Fix agent token deletion race condition - moved PubSub broadcast inside transaction to ensure agents only receive notification after successful deletion
MEDIUM SEVERITY FIXES:
- Fix LIKE wildcard injection in search - applied sanitize_like() to all user-facing search queries in devices.ex, sites.ex, and gaiia.ex to prevent enumeration attacks
- Fix Jason.decode! DoS - replaced with safe Jason.decode/1 with error handling in device_live/index.ex
- Fix SSRF vulnerability - added URL validation in HTTP executor to block requests to private/internal IP ranges (127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16)
- Fix error information leakage - replaced inspect() in API responses with generic error messages, logging details server-side only
- Fix atom table pollution - HTTP method normalization now uses whitelist mapping instead of String.to_atom()
SECURITY IMPROVEMENTS:
- All quota checks now use pessimistic locking (SELECT FOR UPDATE) to prevent TOCTOU race conditions
- Private IP validation prevents cloud metadata service access (169.254.169.254)
- DNS resolution performed before HTTP requests to detect IP spoofing
- Error details logged server-side but not exposed to clients
Files changed:
- lib/towerops/accounts/user_recovery_code.ex
- lib/towerops/organizations.ex
- lib/towerops/devices.ex
- lib/towerops/sites.ex
- lib/towerops/gaiia.ex
- lib/towerops/agents.ex
- lib/towerops/monitoring/executors/http_executor.ex
- lib/towerops_web/live/device_live/index.ex
- lib/towerops_web/controllers/api/v1/mib_controller.ex
- lib/towerops_web/controllers/api/v1/agent_release_webhook_controller.ex
- lib/towerops_web/controllers/api/v1/geoip_controller.ex
Reviewed-on: graham/towerops-web#108
Critical fixes:
- Renamed controller actions to follow Phoenix conventions (verify→new, create→verify)
- Added sudo mode check in GET action using last_sudo_at timestamp
- Added TOTP enrollment check in GET action with redirect
- Changed default return path from /orgs to /users/settings
- Updated route paths from /users/sudo/verify to /users/sudo-verify (dash separator)
- Added success flash message "Identity verified."
Implementation details:
- new/2 (GET): Checks recently_verified_sudo?/1 helper that examines last_sudo_at
instead of authenticated_at to distinguish sudo verification from regular login
- verify/2 (POST): Adds info flash and defaults to /users/settings
- recently_verified_sudo?/1: Private helper checking last_sudo_at within 10 minutes
- Updated all routes, templates, and tests to use new paths and action names
Tests:
- Added tests for already-in-sudo-mode redirect behavior
- Added test for TOTP enrollment requirement
- Updated all test assertions for new route paths and success messages
- All 15 controller tests passing
- Full test suite passing (4076 tests, 0 failures)
- Add UserSudoController with GET and POST /users/sudo/verify routes
- Create verify.html.heex template for TOTP verification form
- Only accept TOTP codes (6 numeric digits), reject recovery codes
- Update grant_sudo_mode to set authenticated_at virtual field
- Exclude /users/sudo paths from return_to overwriting
- Add comprehensive controller tests (12 test cases)
- Verify redirect behavior, error handling, and session management
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
