jory
cba6b18914
- caddy: security headers (X-Content-Type-Options/X-XSS-Protection/ X-Frame-Options) on all vhosts + baseline CSP; strip SnappyMail upstream copies via header_down on mail.severijnse.eu - tlsa-updater: compute TLSA 3 1 1 from cert SPKI (SHA-256), sync _25/_465/_993, fail-safe placeholders; coredns zone updated - pre-commit: wire cachix/git-hooks.nix (alejandra, statix, actionlint, ...); CI pre-commit job over x86_64 + aarch64 matrix - gitea: enable Gitea Actions + self-hosted runner (native:host, aarch64 via binfmt); add .gitea/workflows/ci.yml and local hook - fix statix warnings (merge repeated systemd/database/configFile keys, inherit, bool-compare guards); add missing trailing newlines
97 lines
4.0 KiB
Nix
97 lines
4.0 KiB
Nix
{pkgs, ...}: let
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# Caddy's canonical certificate storage (XDG data dir). Renewals land here,
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# owned caddy:caddy 0600 — the mail server's non-root Postfix/Dovecot cannot
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# read it directly, so we copy it into a world-readable distribution dir.
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caddyCertDir = "/var/lib/caddy/.local/share/caddy/certificates/acme-v02.api.letsencrypt.org-directory/mail.severijnse.eu";
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# World-readable distribution dir mounted (RO) into the mail server container.
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distCertDir = "/var/lib/caddy/certificates/acme-v02.api.letsencrypt.org-directory/mail.severijnse.eu";
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zoneFile = "/var/lib/coredns/zones/severijnse.eu.db";
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syncScript = pkgs.writeShellScript "tlsa-update" ''
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set -euo pipefail
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OPENSSL="${pkgs.openssl}/bin/openssl"
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SRC_CERT="${caddyCertDir}/mail.severijnse.eu.crt"
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SRC_KEY="${caddyCertDir}/mail.severijnse.eu.key"
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DST_CERT="${distCertDir}/mail.severijnse.eu.crt"
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DST_KEY="${distCertDir}/mail.severijnse.eu.key"
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# Caddy has not obtained the certificate yet (e.g. first boot before HTTP-01).
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if [ ! -f "$SRC_CERT" ] || [ ! -f "$SRC_KEY" ]; then
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echo "tlsa-update: certificate not found at $caddyCertDir, skipping" >&2
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exit 0
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fi
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# 1) Propagate Caddy's renewed certificate into the distribution dir the
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# mail server mounts. Caddy stores certs 0600 caddy:caddy. The cert is
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# world-readable (Postfix/Dovecot read it as root before dropping
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# privileges); the private key is restricted to root (0640) so it is not
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# exposed to other local users.
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install -D -m 0644 "$SRC_CERT" "$DST_CERT"
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install -D -m 0640 "$SRC_KEY" "$DST_KEY"
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# 2) TLSA 3 1 1 = SHA-256 of the certificate's SubjectPublicKeyInfo (SPKI),
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# NOT the whole certificate. Matching type 1 = SHA-256 of the SPKI DER.
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HEX=$("$OPENSSL" x509 -in "$DST_CERT" -noout -pubkey 2>/dev/null | "$OPENSSL" pkey -pubin -outform DER 2>/dev/null | "$OPENSSL" dgst -sha256 | cut -d' ' -f2)
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# 3) Update the CoreDNS zone. coredns.service regenerates this file from the
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# Nix store on every start, so this unit (which is partOf coredns and runs
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# after it) re-applies the correct TLSA after each rebuild/restart.
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if [ -f "${zoneFile}" ]; then
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sed -i -E "s/^(_25\._tcp\.mail.*TLSA 3 1 1).*/\1 $HEX/" "${zoneFile}"
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sed -i -E "s/^(_465\._tcp\.mail.*TLSA 3 1 1).*/\1 $HEX/" "${zoneFile}"
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sed -i -E "s/^(_993\._tcp\.mail.*TLSA 3 1 1).*/\1 $HEX/" "${zoneFile}"
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chown coredns:coredns "${zoneFile}"
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chmod 0640 "${zoneFile}"
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fi
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# 4) Reload services so the changes take effect immediately.
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systemctl reload coredns.service || true
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podman exec mailserver postfix reload || true
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podman exec mailserver dovecot reload || true
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echo "tlsa-update: TLSA set to $HEX"
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'';
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in {
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systemd = {
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# Ensure the distribution dir exists (Caddy does not write here).
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tmpfiles.rules = [
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"d ${distCertDir} 0755 root root - -"
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];
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services.tlsa-update = {
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description = "Sync Caddy TLS certificate to mail server and update DANE/TLSA records";
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after = ["caddy.service" "coredns.service"];
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partOf = ["coredns.service"];
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wantedBy = ["multi-user.target"];
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path = with pkgs; [openssl coreutils gnused podman systemd];
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${syncScript}";
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User = "root";
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Group = "root";
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};
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};
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# Fire as soon as Caddy rewrites the certificate on renewal (the atomic rewrite
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# changes the directory mtime), eliminating the up-to-24h DANE drift window.
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paths.tlsa-update = {
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description = "Watch Caddy certificate directory for renewal";
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wantedBy = ["paths.target"];
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pathConfig = {
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PathModified = [caddyCertDir];
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Unit = "tlsa-update.service";
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};
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};
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# Fallback in case a renewal event is missed (e.g. inotify overflow).
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timers.tlsa-update = {
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wantedBy = ["timers.target"];
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timerConfig = {
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OnCalendar = "daily";
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Persistent = true;
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};
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};
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};
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}
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