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feat: add CSRF protection, SSRF prevention, and login rate limiting
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Security hardening implementing three issues:

CSRF Protection (#35):
- Session-based CSRF tokens with cryptographically random 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) and /api (stateless) routes

SSRF Prevention (#36):
- ValidateTargetURL blocks private/reserved IP ranges at target creation
- 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 for defense-in-depth
  at delivery time (prevents DNS rebinding attacks)
- Only http/https schemes allowed

Login Rate Limiting (#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
- X-Forwarded-For and X-Real-IP header support for reverse proxies

Closes #35, closes #36, closes #37
This commit is contained in:
clawbot
2026-03-05 03:04:17 -08:00
parent a51e863017
commit 19e7557e88
18 changed files with 964 additions and 15 deletions
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go.sum
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@@ -103,6 +103,8 @@ golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
golang.org/x/text v0.25.0 h1:qVyWApTSYLk/drJRO5mDlNYskwQznZmkpV2c8q9zls4=
golang.org/x/text v0.25.0/go.mod h1:WEdwpYrmk1qmdHvhkSTNPm3app7v4rsT8F2UD6+VHIA=
golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d h1:vU5i/LfpvrRCpgM/VPfJLg5KjxD3E+hfT1SH+d9zLwg=
golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=