mixandClaude Opus 5.5
dd950364a3
Security audit 2026-10-17, finding I3 (low), stage 4. No compose file set pids_limit: a fork bomb from a compromised panel or postfix had the host's pid space as its limit. Now 1024 for SelfPost - the plan said 512, but Postfix starts up to default_process_limit (100) processes per service, and a busy server runs three smtpd services, cleanup and smtp at once - 256 for nginx, Caddy, Traefik and rspamd, 64 for certbot. The comment that said root runs "very briefly" now says which root processes stay. e2e: checkPidsLimit reads /sys/fs/cgroup/pids.max in the container. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
62 lines
2.5 KiB
YAML
62 lines
2.5 KiB
YAML
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# Alternative reverse-proxy: Traefik. Traefik does NOT write plain PEM files —
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# everything (cert + key) lives bundled inside acme.json. SelfPost needs
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# separate PEM files for Postfix, so an extraction step is required; see
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# extract-cert.sh in this directory and the cron/systemd-timer note below.
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#
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# Merge with the base file — run this from the deploy/ directory (Compose
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# resolves every relative path in both files against the directory of the
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# FIRST -f file, i.e. deploy/, which is why paths below are ./traefik/... -
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# docs.docker.com/compose/how-tos/multiple-compose-files/merge/: "Paths are
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# evaluated relative to the base file"):
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#
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# docker compose -f docker-compose.yml -f traefik/docker-compose.traefik.yml up -d
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services:
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selfpost:
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ports: !override
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- "465:465"
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- "587:587"
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- "25:25"
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volumes: !override
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- ./data:/data
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- .:/selfpost-deploy:ro
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# Populated by extract-cert.sh from traefik's acme.json — see below.
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- ./traefik/extracted-certs:/etc/postfix/tls:ro
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labels:
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# Traefik only proxies the panel; it never sees the mail ports.
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# These live on the selfpost service (not traefik's) because the
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# docker provider reads routing labels off the container being routed
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# to, not off traefik itself. (doc.traefik.io/traefik/v3.1/providers/
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# docker/, "Routing Configuration": "Traefik uses container labels";
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# with exposedByDefault=false only containers labelled
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# traefik.enable=true.)
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- traefik.enable=true
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- traefik.http.routers.selfpost.rule=Host(`mail.example.com`)
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- traefik.http.routers.selfpost.entrypoints=websecure
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- traefik.http.routers.selfpost.tls.certresolver=le
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- traefik.http.services.selfpost.loadbalancer.server.port=8080
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traefik:
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image: traefik:v3.1
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restart: unless-stopped
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# A ceiling on processes and threads (security audit 2026-10-17, I3).
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pids_limit: 256
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depends_on:
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- selfpost
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command:
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- --providers.docker=true
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- --providers.docker.exposedbydefault=false
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- --entrypoints.web.address=:80
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- --entrypoints.websecure.address=:443
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- --entrypoints.web.http.redirections.entrypoint.to=websecure
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- --certificatesresolvers.le.acme.email=you@example.com
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- --certificatesresolvers.le.acme.storage=/letsencrypt/acme.json
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- --certificatesresolvers.le.acme.httpchallenge.entrypoint=web
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ports:
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- "80:80"
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- "443:443"
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock:ro
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- ./traefik/letsencrypt:/letsencrypt
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