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>
45 lines
2.1 KiB
YAML
45 lines
2.1 KiB
YAML
# Optional anti-spam sidecar for inbound relay (docs/plans/inbound-relay.md).
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#
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# SelfPost does not ship or start an anti-spam engine. This fragment brings up
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# rspamd next to SelfPost and points the inbound smtpd milter at it. Merge it
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# only when you want filtering on port 25:
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#
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# docker compose -f docker-compose.yml -f antispam/docker-compose.antispam.yml up -d
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#
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# Requires INBOUND_RELAY_ENABLE=true in .env. The milter sees the real client
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# IP, HELO and PTR — unlike the upstream, which only sees SelfPost's address.
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#
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# The rspamd image is pinned to one build, 3.11.1-3 - "3.11" and "3.11.1"
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# move with each rebuild (Docker Hub rspamd/rspamd tags 3.11.1-0 ... -3) -
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# and it is the build the comments in antispam/rspamd/ were read against;
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# bump it deliberately, and read them again. Default milter action is fail-open (accept) so a down sidecar
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# does not block backup-MX. Set INBOUND_ANTISPAM_MILTER_ACTION=tempfail to
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# defer instead.
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services:
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selfpost:
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environment:
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INBOUND_RELAY_ENABLE: "${INBOUND_RELAY_ENABLE:-true}"
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INBOUND_ANTISPAM_MILTER: "${INBOUND_ANTISPAM_MILTER:-inet:antispam:11332}"
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INBOUND_ANTISPAM_MILTER_ACTION: "${INBOUND_ANTISPAM_MILTER_ACTION:-accept}"
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depends_on:
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- antispam
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antispam:
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# The milter: rspamd 3.11.1, conf/worker-proxy.inc, "milter = yes" for the
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# rspamd_proxy worker, which the image binds to *:11332 (rspamd-docker
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# v3.11.1+3, patches/rspamd-docker-config.diff), and runs as uid 11333
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# (its Dockerfile, USER 11333:11333).
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image: rspamd/rspamd:3.11.1-3
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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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# No host ports: only SelfPost talks to the milter on the compose network.
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volumes:
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# The verdict headers SelfPost's inbound journal reads.
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- ./antispam/rspamd/milter_headers.conf:/etc/rspamd/local.d/milter_headers.conf:ro
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# The allow and deny lists kept in the panel: the rules, and the files
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# SelfPost writes them to.
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- ./antispam/rspamd/multimap.conf:/etc/rspamd/local.d/multimap.conf:ro
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- ./data/antispam:/etc/rspamd/selfpost:ro
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