Security hardening from the assessment; testing fixes

Security (ultimo-security-report.md):
- Security headers on every response, the app shell included: they lived at
  server level and nginx dropped them in any location with its own header.
  CSP, framing, nosniff, referrer, permissions (docker/nginx-security.conf).
- Plain HTTP forwarded by the reverse proxy is redirected to HTTPS; HSTS on
  HTTPS responses. server_tokens off.
- Cross-site state-changing /api requests refused (login CSRF), WebSocket too.
- Validation errors in the usual error shape, without the request model.
- New-password policy: max 128, common/own-address/repeated refused,
  breached-password check (HIBP k-anonymity, fails open).
- Message HTML: links keep only http(s)/mailto (sanitizer v6); the HTML
  endpoint carries its own no-script CSP.
- Outbound fetches pinned to the checked IP (DNS rebinding); external
  IMAP/SMTP servers re-checked before each connection; CGNAT and mapped
  addresses counted as non-public.

Fixes from testing:
- IDLE loop catches up before idling: mail that came while the worker was
  away no longer waits up to 10 minutes.
- Restore from Spam/Trash/Archive moves only the removed messages, not your
  reply in Sent.
- Narrow desktop list stacks sender/subject/snippet (subject was squeezed
  to nothing at the default width), with hover actions.
- Phone: wide emails scale to fit the screen.
- Singular forms ("1 message"); no zip button for a single attachment;
  app passwords no longer claim "never used" for mail apps.
- ruff format across the backend.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

This commit is contained in:

lukas

2026-10-14 22:08:06 +02:00

co-authored by

Claude Opus 5.5

parent 30b806e7da

commit addb2232a1

54 changed files with 1265 additions and 187 deletions

									
										docker/Dockerfile.frontend
									
		+1
		
												View File
												
				@@ -30,6 +30,7 @@ COPY docker/nginx.conf /etc/nginx/conf.d/default.conf

				# Shared server body, included by both listeners. Outside conf.d/ so nginx

				# does not try to load it as a config of its own.

				COPY docker/nginx-app.conf /etc/nginx/webmail-app.conf

				COPY docker/nginx-security.conf /etc/nginx/webmail-security.conf

				COPY --from=builder /src/dist /usr/share/nginx/html

				# Surface the running version to `deploy/webmail.sh status` without needing the API.