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Viktor Barzin 23173131f4 [mailserver] Add Dovecot auth_failure_delay 5s [ci skip] 
## Context

Dovecot's `dovecot.cf` block previously set only
`mail_max_userip_connections = 50`. No equivalent of the SMTP rate
limit existed for IMAP auth — brute-force against IMAP/POP auth was
throttled only by CrowdSec at the LB level. Adding an in-process
auth delay is cheap defense in depth. Addresses code-9mi.

## This change

Adds `auth_failure_delay = 5s` to the dovecot.cf ConfigMap key.
Each failed auth attempt pauses 5s before responding; a sequential
1000-entry dictionary attack stretches from <1s to ~85min, bought
out CrowdSec's ban window.

## What is NOT in this change

- `login_processes_count` tuning (workload doesn't warrant it yet)
- Equivalent SMTP AUTH delay (CrowdSec already covers, and SMTP AUTH
  is rate-limited via `smtpd_client_connection_rate_limit`)

## Test Plan

### Automated
```
$ kubectl exec -n mailserver -c docker-mailserver deployment/mailserver -- \
    doveconf -n | grep -E 'auth_failure|mail_max_userip'
auth_failure_delay = 5 secs
mail_max_userip_connections = 50

$ kubectl rollout status deployment/mailserver -n mailserver
deployment "mailserver" successfully rolled out
```

### Manual Verification
1. `openssl s_client -connect mail.viktorbarzin.me:993`
2. `a1 LOGIN bogus@viktorbarzin.me wrongpass` — expect ~5s delay before `NO [AUTHENTICATIONFAILED]`
3. Fire 5 failed attempts rapidly: total ≥25s

## Reproduce locally
1. `kubectl exec -n mailserver -c docker-mailserver deployment/mailserver -- doveconf -n | grep auth_failure`
2. Expected: `auth_failure_delay = 5 secs`

Closes: code-9mi

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-19 10:33:05 +00:00
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_template [infra] Establish KYVERNO_LIFECYCLE_V1 drift-suppression convention [ci skip] 2026-04-18 14:15:51 +00:00
actualbudget [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
affine [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
authentik [infra] Adopt Authentik catch-all Proxy Provider + Application into TF (Wave 6a) 2026-04-18 22:48:26 +00:00
beads-server [beads-server] Auto-dispatch agent beads via CronJobs 2026-04-18 22:35:46 +00:00
blog [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
broker-sync broker-sync: chown fidelity_storage_state to broker uid in init container 2026-04-18 23:22:43 +00:00
calico [infra] Partial Calico adoption: namespaces only (Wave 5b) 2026-04-18 22:52:56 +00:00
changedetection [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
city-guesser [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
claude-agent-service [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
claude-memory [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
cloudflared [mailserver] Route DMARC rua/ruf to dmarc@viktorbarzin.me [ci skip] 2026-04-18 23:49:14 +00:00
cnpg [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
coturn [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
crowdsec [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
cyberchef [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
dashy [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
dawarich [dawarich] Re-enable Sidekiq worker with resource limits + probes 2026-04-18 21:13:05 +00:00
dbaas [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
descheduler [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
diun [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
ebook2audiobook [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
ebooks [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
echo [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
excalidraw [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
external-secrets [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
f1-stream [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
foolery [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
forgejo [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
freedify [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
freshrss [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
frigate [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
grampsweb [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
hackmd [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
headscale [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
health [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
hermes-agent [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
homepage [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
immich [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
infra [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
infra-maintenance [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
insta2spotify [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
isponsorblocktv [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
jsoncrack [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
k8s-dashboard [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
k8s-portal [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
kms [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
kured [infra] Adopt kured + sentinel-gate into Terraform (Wave 5a) 2026-04-18 22:33:29 +00:00
kyverno [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
linkwarden [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
local-path [infra] Adopt local-path-provisioner into Terraform (Wave 5c) 2026-04-18 22:39:55 +00:00
mailserver [mailserver] Add Dovecot auth_failure_delay 5s [ci skip] 2026-04-19 10:33:05 +00:00
matrix [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
meshcentral [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
metallb [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
metrics-server [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
monitoring [monitoring] Scrape mailserver Dovecot exporter + near-limit alerts 2026-04-19 00:24:12 +00:00
n8n [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
navidrome [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
netbox [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
networking-toolbox [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
nextcloud [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
nfs-csi [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
novelapp [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
ntfy [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
nvidia [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
onlyoffice [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
openclaw [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
osm_routing [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
owntracks [owntracks] Bridge Recorder → Dawarich via Lua hook script 2026-04-18 23:47:22 +00:00
paperless-ngx [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
payslip-ingest [payslip-ingest] Move Payslips datasource 'database' into jsonData 2026-04-18 23:23:07 +00:00
phpipam [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
platform [infra] Add Cloudflare provider to all stack lock files and generated providers 2026-04-16 16:31:36 +00:00
plotting-book [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
poison-fountain [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
priority-pass [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
privatebin [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
proxmox-csi [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
pvc-autoresizer [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
rbac [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
real-estate-crawler [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
redis [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
reloader [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
resume [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
reverse-proxy [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
rybbit [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
sealed-secrets [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
send [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
servarr [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
shadowsocks [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
speedtest [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
status-page [infra] Establish KYVERNO_LIFECYCLE_V1 drift-suppression convention [ci skip] 2026-04-18 14:15:51 +00:00
stirling-pdf [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
tandoor [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
technitium [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
terminal [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
tor-proxy [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
trading-bot [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
traefik [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
travel_blog [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
tuya-bridge [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
uptime-kuma [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
url [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
vault [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
vaultwarden [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
vpa [infra] Migrate Terraform state from local SOPS to PostgreSQL backend 2026-04-16 19:33:12 +00:00
wealthfolio wealthfolio: add nightly backup sidecar — SQLite → NFS 2026-04-18 22:25:19 +00:00
webhook_handler [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
whisper [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
wireguard [infra] Suppress Goldilocks vpa-update-mode label drift on all namespaces [ci skip] 2026-04-18 21:15:27 +00:00
woodpecker [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
xray [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00
ytdlp [infra] Sweep dns_config ignore_changes across all pod-owning resources [ci skip] 2026-04-18 21:19:48 +00:00