docker-compose.hardened.yml

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# Hardening overlay — apply on top of docker-compose.yml OR docker-compose.ghcr.yml:
#
#   docker compose -f docker-compose.yml       -f docker-compose.hardened.yml up -d
#   docker compose -f docker-compose.ghcr.yml  -f docker-compose.hardened.yml up -d
#
# Works with both rootful and rootless engines (Docker rootless / Podman). It
# adds no-new-privileges, capability dropping, a read-only app rootfs and
# resource limits. The app is a static binary that already runs as a non-root
# user and writes nothing to its container filesystem, so it can be locked down
# hard; Postgres needs a writable data dir and a few capabilities for its
# entrypoint, so it is hardened more conservatively.

services:
  app:
    # Static binary, logs to stdout, photos live in the DB — nothing is written
    # to the container filesystem, so the rootfs can be read-only.
    #
    # Backup temp files (S3 upload and read-back, downloads, the decrypted dump
    # during a restore) are as large as the database. They go to
    # <PARKRR_BACKUP_DIR>/.tmp on the /backups volume, NOT to /tmp: keep
    # PARKRR_BACKUP_DIR set to a writable volume, even for an S3-only setup (an
    # empty volume cron keeps volume backups off). Plan free space there of about
    # twice the archive size (S3 upload plus its read-back copy, or a staged
    # upload plus the decrypted dump during a restore). Only with an empty
    # PARKRR_BACKUP_DIR does the app fall back to /tmp, and the 32 MiB tmpfs below
    # is far too small for that.
    # Tax ZIP exports separately stage receipts in /tmp (24 MiB default limit).
    # For larger exports provision a private writable volume and set TMPDIR plus
    # PARKRR_TAX_EXPORT_MAX_RECEIPT_MB in your own override. Concurrent exports
    # share that capacity; a full spool aborts before download, without DB writes.
    read_only: true
    tmpfs:
      # Bounded so a runaway temp write cannot consume host RAM up to mem_limit
      # (tmpfs pages count toward the container's memory).
      - /tmp:size=32m,mode=1777
    security_opt:
      - no-new-privileges:true
    cap_drop:
      - ALL
    # Match the image's own non-root user (Dockerfile: adduser -u 10001 parkrr) and the
    # /backups owner. Forcing a different uid (e.g. 65532) makes /backups unwritable and
    # silently breaks scheduled backups.
    user: "10001:10001"
    mem_limit: 256m
    pids_limit: 128
    cpus: 1.0

  db:
    security_opt:
      - no-new-privileges:true
    # Drop everything, then add back only what the official Postgres entrypoint
    # needs: chown the data dir (CHOWN/FOWNER/DAC_OVERRIDE) and drop to the
    # postgres user via gosu (SETUID/SETGID). Remove this block if your Postgres
    # image/entrypoint differs and fails to start.
    cap_drop:
      - ALL
    cap_add:
      - CHOWN
      - DAC_OVERRIDE
      - FOWNER
      - SETGID
      - SETUID
    mem_limit: 512m
    pids_limit: 256