mix
ac5b37d1e2
Phase 13. Two new packages and one new screen. internal/health owns the shared status vocabulary (ok/warn/error/unknown) and the local checks: supervisord's process table, TLS certificate expiry and the two milter sockets. Each check reports a problem as a status rather than an error, so one broken component costs a line and not the page. internal/dnscheck does the read-only lookups: forward-confirmed reverse DNS for SELFPOST_HOSTNAME, and per-domain DKIM (compared against the key this server actually signs with), SPF and DMARC. Every check is bounded by a timeout and cached, and the resolver sits behind an interface so the tests drive every branch without touching the network. The SPF check is deliberately shallow: it looks for a mechanism literally covering the server's address and does not follow include:/redirect=, so a record that authorises us through an include is reported as "cannot tell" rather than as a failure. /status renders both, with the local checks in an HTMX-polled fragment and the DNS lookups behind a Re-check button, and becomes the panel's landing page: / now redirects there and the domain list lives at /domains. The Reload button moves onto /status, where it reads as what it is — a drift-recovery for the daemons — with text explaining what it regenerates. A template test fails on any remaining href="/" so a stale link cannot silently land on the wrong screen. Also fixes a defect this made visible: the panel could never read the mail queue in the documented deployment. postqueue relies on its setgid-postdrop bit, which the compose file's no-new-privileges disables, so the Queue screen always said "Could not read the mail queue" — including in the released 1.0.0 image. The panel user is now a real member of postdrop, which needs no setgid transition. Verified in a container on the dev server against real DNS: PTR matching (selfpost.mixfed.ru) and not matching (mixfed.ru), DKIM absent and mismatched, SPF absent and via include:, DMARC p=quarantine/p=reject/absent, and a resolver timeout degrading to "unknown" without hanging the page. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
110 lines
4.7 KiB
Docker
110 lines
4.7 KiB
Docker
# syntax=docker/dockerfile:1
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#
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# SelfPost — single Debian-slim image running postfix + opendkim + panel under
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# supervisord (spec 4). Build from the repository root:
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#
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# docker build -f build/Dockerfile -t selfpost:dev --build-arg VERSION=dev .
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# ---- build stage -------------------------------------------------------------
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FROM golang:1.26-bookworm AS build
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WORKDIR /src
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# Version stamped into both binaries; MUST match the image tag (spec 7.5.A).
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ARG VERSION=dev
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# Module metadata first for layer caching. go.sum arrived in Phase 2 with the
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# SQLite driver and bcrypt.
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COPY go.mod go.sum ./
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RUN go mod download
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COPY cmd ./cmd
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COPY internal ./internal
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ENV CGO_ENABLED=0
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RUN go vet ./... \
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&& go build -trimpath \
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-ldflags "-X codeberg.org/mix/selfpost/internal/buildinfo.Version=${VERSION}" \
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-o /out/panel ./cmd/panel \
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&& go build -trimpath \
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-ldflags "-X codeberg.org/mix/selfpost/internal/buildinfo.Version=${VERSION}" \
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-o /out/selfpost-backup ./cmd/selfpost-backup
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# ---- runtime stage -----------------------------------------------------------
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FROM debian:bookworm-slim AS runtime
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ENV DEBIAN_FRONTEND=noninteractive
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# Preseed Postfix so its install is non-interactive and yields a working
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# main.cf. The real relay configuration is generated by the panel in Phase 5.
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RUN echo "postfix postfix/mailname string localhost" | debconf-set-selections \
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&& echo "postfix postfix/main_mailer_type string Internet Site" | debconf-set-selections \
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&& apt-get update \
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&& apt-get install -y --no-install-recommends \
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postfix \
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opendkim \
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opendkim-tools \
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sasl2-bin \
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libsasl2-modules \
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db-util \
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supervisor \
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logrotate \
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ca-certificates \
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&& rm -rf /var/lib/apt/lists/*
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# Unprivileged user for the panel process (spec 7.6.8).
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RUN useradd --system --no-create-home --shell /usr/sbin/nologin panel
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# Shared group bridging the unprivileged services (spec 5.1, 6): the panel
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# generates per-domain DKIM keys, application SASL accounts (sasldb2) and the
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# Postfix sender map, while OpenDKIM and Postfix (different users) must read
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# them. Membership in this group — plus setgid dirs under /data (set up in
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# entrypoint.sh) — lets OpenDKIM read the panel-owned keys and lets Postfix read
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# the sasldb2/sender map, and lets the panel reach the supervisor control socket
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# to signal OpenDKIM/Postfix reloads without any process running as root.
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RUN groupadd --system selfpost \
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&& usermod -aG selfpost panel \
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&& usermod -aG selfpost opendkim \
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&& usermod -aG selfpost postfix
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# The panel reads the mail queue with `postqueue -p` (spec 7.2.11, and the
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# status page's queue card). postqueue is setgid postdrop, which normally gives
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# it the group needed to reach Postfix's showq socket — but the documented
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# deployment runs with `no-new-privileges`, which disables setgid transitions,
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# so the panel would always see "Permission denied". Making `panel` a real
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# member of postdrop grants the same access without relying on a setgid
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# escalation the hardening deliberately forbids. postdrop membership is
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# read-side only: it does not let the panel bypass any Postfix restriction that
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# a local user does not already have through the world-executable sendmail.
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RUN usermod -aG postdrop panel
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# Runtime directories: milter sockets and the consolidated persistent root.
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RUN mkdir -p /run/opendkim /run/selfpost /data \
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&& chown opendkim:opendkim /run/opendkim \
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&& chown panel:panel /run/selfpost /data
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COPY --from=build /out/panel /usr/local/bin/panel
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COPY --from=build /out/selfpost-backup /usr/local/bin/selfpost-backup
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COPY build/opendkim.conf /etc/opendkim.conf
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COPY build/logrotate-mail.conf /etc/logrotate.d/mail
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COPY build/postfix-wrapper.sh /usr/local/bin/postfix-wrapper.sh
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COPY build/postfix-config.sh /usr/local/bin/postfix-config.sh
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COPY build/postfix-cert-reload.sh /usr/local/bin/postfix-cert-reload.sh
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COPY build/logrotate-loop.sh /usr/local/bin/logrotate-loop.sh
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COPY build/crashexit.py /usr/local/bin/crashexit.py
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COPY build/entrypoint.sh /usr/local/bin/entrypoint.sh
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COPY build/supervisord.conf /etc/supervisor/supervisord.conf
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RUN chmod +x /usr/local/bin/postfix-wrapper.sh /usr/local/bin/postfix-config.sh \
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/usr/local/bin/postfix-cert-reload.sh /usr/local/bin/logrotate-loop.sh \
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/usr/local/bin/crashexit.py /usr/local/bin/entrypoint.sh
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# Published submission ports: 465 (smtps, primary) and 587 (submission, optional)
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# plus the panel on 8080. Outbound delivery dials remote MXs on 25 as a client,
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# which needs no inbound listener or EXPOSE.
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EXPOSE 8080 465 587
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# The entrypoint fixes /data ownership (bind mount) as root, then execs
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# supervisord, which becomes PID 1 and owns process supervision (spec 4).
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ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]
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