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## Security Hardening This PR implements three security hardening issues: ### CSRF Protection (closes #35) - Session-based CSRF tokens with cryptographically random 256-bit generation - Constant-time token comparison to prevent timing attacks - CSRF middleware applied to `/pages`, `/sources`, `/source`, and `/user` routes - Hidden `csrf_token` field added to all 12+ POST forms in templates - Excluded from `/webhook` (inbound webhook POSTs) and `/api` (stateless API) ### SSRF Prevention (closes #36) - `ValidateTargetURL()` blocks private/reserved IP ranges at target creation time - Blocked 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`, `::1`, `fc00::/7`, `fe80::/10`, plus multicast, reserved, test-net, and CGN ranges - SSRF-safe HTTP transport with custom `DialContext` in the delivery engine for defense-in-depth (prevents DNS rebinding attacks) - Only `http` and `https` schemes allowed ### Login Rate Limiting (closes #37) - Per-IP rate limiter using `golang.org/x/time/rate` - 5 attempts per minute per IP on `POST /pages/login` - GET requests (form rendering) pass through unaffected - Automatic cleanup of stale per-IP limiter entries every 5 minutes - `X-Forwarded-For` and `X-Real-IP` header support for reverse proxies ### Files Changed **New files:** - `internal/middleware/csrf.go` + tests — CSRF middleware - `internal/middleware/ratelimit.go` + tests — Login rate limiter - `internal/delivery/ssrf.go` + tests — SSRF validation + safe transport **Modified files:** - `internal/server/routes.go` — Wire CSRF and rate limit middleware - `internal/handlers/handlers.go` — Inject CSRF token into template data - `internal/handlers/source_management.go` — SSRF validation on target creation - `internal/delivery/engine.go` — SSRF-safe HTTP transport for production - All form templates — Added hidden `csrf_token` fields - `README.md` — Updated Security section and TODO checklist `docker build .` passes (lint + tests + build). Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de> Co-authored-by: clawbot <clawbot@eeqj.de> Co-authored-by: Jeffrey Paul <sneak@noreply.example.org> Reviewed-on: #42 Co-authored-by: clawbot <clawbot@noreply.example.org> Co-committed-by: clawbot <clawbot@noreply.example.org>
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