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ci: actions by commit, govulncheck, images pinned, base packages watched (audit I4, I5)

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Security audit 2026-10-17, findings I4 and I5 (low), stage 5.

I4: every action is pinned by commit with its version in a comment - the
latest release of the major each used, so nothing changes in behaviour
(checkout v4.4.0, setup-go v5.6.0, setup-buildx-action v3.12.0,
build-push-action v6.19.2, login-action v3.7.0; commits read with git
ls-remote, the tags are lightweight). govulncheck v1.9.0 runs on the
source in test.yml, and in release.yml on the image's panel and
selfpost-backup binaries before the push (-mode=binary: the base image's
Go, which may lag the runner's - a fixed stdlib advisory then fails the
release until golang:1.26-trixie moves, which is the point). certbot is
pinned to v5.8.0 and Caddy to 2.11.7 (Docker Hub, 2026-10-17).
provenance/SBOM stay off until the GHCR cleanup keeps attestations, as the
plan says.

I5: published tags are never rebuilt, so a Debian security fix reaches
operators with the next release. The guide (§ Upgrading) and SECURITY.md
say so; base-packages.yml runs .github/scripts/base-packages.sh every
Monday: what debian:trixie-slim would install for postfix, libsasl2-2,
libsasl2-modules-db, sasl2-bin, openssl, libssl3t64, libdb5.3t64 against
the table in development.md (the 2.14.3 image's versions), red when one
moved. Tried on the test server: green as it stands, red with a version
changed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
mix
2026-10-17 22:33:02 +03:00
co-authored by Claude Opus 5.5
parent bde6a4000e
commit 68493dc097
11 changed files with 141 additions and 17 deletions
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.github/scripts/base-packages.sh
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#!/bin/sh
# base-packages.sh: compare the Debian packages the mail path runs on with
# what debian:trixie-slim would install today (security audit 2026-10-17,
# I5). The image installs without pinning, and published tags are never
# rebuilt, so a security update of postfix, Cyrus SASL, OpenSSL or Berkeley
# DB reaches operators only with the next release. This fails when one of
# them has moved past the version the last release was built with - the
# table between the base-package-versions markers in docs/development.md -
# as the nudge to cut a patch release (and then to update the table).
#
# Run by .github/workflows/base-packages.yml every week; needs docker.
set -eu
doc=docs/development.md
table=$(sed -n '/<!-- base-package-versions -->/,/<!-- \/base-package-versions -->/p' "$doc" |
sed -n 's/^| `\([^`]*\)` | `\([^`]*\)` |$/\1 \2/p')
[ -n "$table" ] || { echo "no base-package-versions table in $doc" >&2; exit 2; }
names=$(echo "$table" | cut -d' ' -f1 | tr '\n' ' ')
# apt-cache policy's "Candidate:" is what an install would take now.
now=$(docker run --rm debian:trixie-slim sh -c "apt-get update -qq >/dev/null && for p in $names; do printf '%s %s\n' \"\$p\" \"\$(apt-cache policy \"\$p\" | sed -n 's/^ *Candidate: //p')\"; done")
moved=0
echo "$table" | while read -r name built; do
cand=$(echo "$now" | awk -v n="$name" '$1 == n { print $2 }')
if [ "$cand" != "$built" ]; then
echo "::warning::$name: the last release was built with $built, trixie now installs ${cand:-nothing}" >&2
echo moved
fi
done | grep -q moved && moved=1
if [ "$moved" = 1 ]; then
echo "A package the mail path runs on has moved: cut a patch release, then update the table in $doc." >&2
exit 1
fi
echo "Every watched package is as the last release was built."