Tizian 「ティツィアーン」
d8c827eab6
The instance serves jellyfin.halkyon.eu and its Caddy proxies through a WireGuard tunnel to a Jellyfin on the operator's own machine, which dials out, so nothing names the home network's address and its router opens no port. compose.jellyfin-home.yaml takes the sidecar's place, with its site's rules unchanged (jellyfin.caddy's upstream is now a setting), and leaves JELLYFIN_URL unset, so the instance suggests it only while it answers. On the instance's server the tunnel reaches Jellyfin from Caddy alone and nothing of the host (wg-jellyfin-rules.sh, set and removed with the tunnel); the CI runner's unit denies it, and CI's Sandbox step fails if a job reaches it. The home end keeps Jellyfin in WireGuard's network namespace, its port on the loopback alone. The steps are in deploy/sidecars/README.md, the rules held by test/deploy/jellyfin_home_test.dart. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
85 lines
3.6 KiB
Desktop File
85 lines
3.6 KiB
Desktop File
# The Forgejo Actions runner of this repository's CI, on learn.halkyon.eu's server. Installed as
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# /etc/systemd/system/forgejo-runner.service; its configuration is config.yml, next to
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# this file.
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#
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# Jobs run directly on the host as the unprivileged user `runner` ("without any
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# isolation" from that user, as Forgejo's security guide puts it), and they run our
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# dependencies' build code. On the production server, so everything below keeps them
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# away from production and makes sure CI can't starve the instance. Docker is out of
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# reach entirely: `runner` isn't in the docker group, and the socket is hidden too.
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#
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# `runner` has user and group ID 61000, and must never share a user ID with a
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# container's processes (PostgreSQL and the server run as 999; Docker doesn't remap
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# them): processes of one user ID can read each other's environment and, through
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# /proc, their files. `useradd --system` picks 999 when it is free, so create it with
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# useradd --system --uid 61000 --user-group --create-home \
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# --home-dir /var/lib/forgejo-runner --shell /usr/sbin/nologin runner
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# CI's first step checks this sandbox and fails if it leaks.
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[Unit]
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Description=Forgejo Actions runner (CI of halkyon_learn; jobs on the host)
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Documentation=https://forgejo.org/docs/latest/admin/actions/security/
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After=network-online.target
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Wants=network-online.target
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[Service]
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User=runner
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Group=runner
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WorkingDirectory=/var/lib/forgejo-runner
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ExecStart=/usr/local/bin/forgejo-runner daemon --config /etc/forgejo-runner/config.yml
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# The runner's token, from a root-only file.
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LoadCredential=token:/etc/forgejo-runner/token
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Restart=on-failure
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RestartSec=30
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# The runner waits up to 10 minutes for a running job (shutdown_timeout).
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TimeoutStopSec=11min
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# Away from production: /home (deploy's .env, the checkout, the database dumps) is
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# invisible, the rest of the system read-only except the runner's own directory, other
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# users' processes hidden, and Docker's container networks, where the database listens,
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# unreachable, and so is the tunnel to Jellyfin at home (10.61.96.0/30, ADR 0032, D6).
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ProtectHome=yes
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ProtectSystem=strict
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ReadWritePaths=/var/lib/forgejo-runner
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PrivateTmp=yes
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ProtectProc=invisible
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InaccessiblePaths=-/run/docker.sock -/run/containerd -/var/lib/docker
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IPAddressDeny=172.16.0.0/12 192.168.0.0/16 fd00::/8 10.61.96.0/30
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NoNewPrivileges=yes
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CapabilityBoundingSet=
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AmbientCapabilities=
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SystemCallArchitectures=native
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RestrictSUIDSGID=yes
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ProtectKernelTunables=yes
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ProtectKernelModules=yes
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ProtectKernelLogs=yes
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ProtectControlGroups=yes
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ProtectClock=yes
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ProtectHostname=yes
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LockPersonality=yes
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RestrictRealtime=yes
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RestrictNamespaces=yes
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RemoveIPC=yes
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# Netlink stays: Dart lists network interfaces through it.
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RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 AF_NETLINK
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# System calls no CI job needs fail with an error rather than killing the job.
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SystemCallFilter=~@clock @cpu-emulation @debug @module @mount @obsolete @raw-io @reboot @swap
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SystemCallErrorNumber=EPERM
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UMask=0077
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# Never at the instance's expense: two of the four cores, at most 6 GB of the 8 (the
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# kernel reclaims from CI first above 5.5 GB), the lowest priority for CPU and disk, and
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# CI's processes the first the kernel kills should the whole server run out of memory.
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# A cold `dart analyze` of the workspace with its lint plugin needs about 5.4 GB since
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# Todo and the shared packages joined it (3.7 GB warm); below that the kernel slowed it
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# to a crawl and then killed it, and OOMPolicy's default then stopped the whole unit.
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CPUQuota=200%
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MemoryHigh=5.5G
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MemoryMax=6G
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OOMScoreAdjust=1000
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TasksMax=2048
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Nice=10
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IOSchedulingClass=best-effort
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IOSchedulingPriority=7
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[Install]
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WantedBy=multi-user.target
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