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Host-side dnsmasq the agent manages so LAN clients reach their guest directly (same hostname + real wildcard cert, no Cloudflare hairpin). Renders local=/ +address=/ per customer (AAAA->NODATA via authoritative zone, wildcard A -> live guest IP), forwards everything else. Manager ensures dnsmasq+base config, discovers guest IP (pct exec ip) + domain (controller.yaml), write-if-changed + reload. Loop (7th daemon goroutine) tracks DHCP IP changes per provisioned guest. --selftest=lanresolver. FELHOM_DNSMASQ sudoers. Spiked live on felhom-pve. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
65 lines
4.0 KiB
Plaintext
65 lines
4.0 KiB
Plaintext
# felhom-agent sudoers allowlist — the NARROW host-root surface (slice 5 Phase B, doc 03 §3/§7).
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#
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# Install as a drop-in: /etc/sudoers.d/felhom-agent (mode 0440, root:root), validated with
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# `visudo -cf`. The agent runs as the non-root `felhom-agent` service user and shells out via
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# `sudo -n` with FIXED argument vectors (no shell). The fine-grained validation is done IN
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# the agent BEFORE exec (internal/storage/validate.go): UUIDs against a strict hex regex,
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# mount paths confined+traversal-checked, SMART devices whitelisted to raw disks, LVM names
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# charset-checked. These sudoers wildcards are the COARSE allowlist; the agent is the fine
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# gate, so a wildcard can never be abused by a value the agent didn't already validate.
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#
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# Binary paths MUST match the agent config (privileged.systemctl/install/smartctl/lvs). Adjust
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# for your distro (Debian/PVE shown). A missing/declined entry degrades the agent with a
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# warning (SMART→UNKNOWN, mount→logged error), it does not crash.
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Cmnd_Alias FELHOM_MOUNT = \
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/usr/bin/install -o root -g root -m 0644 -- /var/lib/felhom-agent/units/* /etc/systemd/system/*.mount, \
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/usr/bin/systemctl daemon-reload, \
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/usr/bin/systemctl enable --now -- *.mount, \
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/usr/bin/systemctl disable -- *.mount, \
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/usr/bin/systemctl stop -- *.mount
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Cmnd_Alias FELHOM_DISK = \
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/usr/sbin/smartctl -a -j /dev/sd[a-z]*, \
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/usr/sbin/smartctl -a -j /dev/nvme[0-9]*n[0-9]*, \
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/usr/sbin/smartctl -a -j /dev/vd[a-z]*, \
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/usr/sbin/smartctl -a -j /dev/hd[a-z]*, \
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/usr/sbin/lvs --reportformat json --units b -o lv_name,data_percent,metadata_percent -- *
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# Provisioning back-half (slice 8A, doc 03 §6): populate a guest's bootstrap config mount
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# host-side (internal/provision). These are host-root ops the API token cannot do — a bind mount
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# is root@pam-only, and the chown maps the 0600 bootstrap.json to the unprivileged-LXC guest-root
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# (uid/gid 100000, spike gotcha 1). The host dir is AGENT-OWNED state under /var/lib/felhom-agent/
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# (the wildcard only ever names a path the agent itself created), and the bootstrap file the agent
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# writes there is the only thing these touch. ':' is escaped per sudoers grammar.
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Cmnd_Alias FELHOM_PROVISION = \
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/usr/bin/chown -R 100000\:100000 /var/lib/felhom-agent/guests/*, \
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/usr/sbin/pct set [0-9]* -mp[0-9]* /var/lib/felhom-agent/guests/*
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# Disk inspection + format (slice 8C). blkid/lsblk read the device's data-bearing evidence (the
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# agent decides data-bearing-ness from THIS, never the caller's claim); mkfs.* formats a device the
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# agent already classified blank (a data-bearing format is refused pending an operator signature).
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# The agent fine-validates the device path (ValidateBlockDevice: raw disk / partition under /dev
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# only) + fstype before any exec — the wildcard is the coarse allowlist, the agent is the fine gate.
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Cmnd_Alias FELHOM_FORMAT = \
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/usr/sbin/blkid -p -o export /dev/*, \
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/usr/bin/lsblk -J -o NAME,FSTYPE,PTTYPE,MOUNTPOINT /dev/*, \
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/usr/sbin/mkfs.ext4 -F /dev/*, \
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/usr/sbin/mkfs.xfs -f /dev/*
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# LAN split-horizon resolver (internal/lanresolver): the agent manages a host-side dnsmasq that
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# answers *.<customer-domain> with each guest's live LAN IP. install only ever writes felhom-*.conf
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# drop-ins (from agent-written /tmp temp files); the two `pct exec` reads are FIXED command vectors
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# (the guest's eth0 IPv4 + the controller's pulled controller.yaml for the domain) — NOT a general
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# `pct exec`. systemctl is scoped to the dnsmasq unit only. The agent never edits /etc/resolv.conf.
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Cmnd_Alias FELHOM_DNSMASQ = \
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/usr/bin/apt-get install -y -q dnsmasq, \
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/usr/bin/install -m 0644 /tmp/felhom-resolver-*.conf /etc/dnsmasq.d/felhom-*.conf, \
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/usr/bin/systemctl enable --now dnsmasq, \
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/usr/bin/systemctl reload dnsmasq, \
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/usr/bin/rm -f /etc/dnsmasq.d/felhom-*.conf, \
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/usr/sbin/pct exec [0-9]* -- ip -4 -o addr show dev eth0, \
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/usr/sbin/pct exec [0-9]* -- docker exec felhom-controller cat /opt/docker/felhom-controller/controller.yaml
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felhom-agent ALL=(root) NOPASSWD: FELHOM_MOUNT, FELHOM_DISK, FELHOM_PROVISION, FELHOM_FORMAT, FELHOM_DNSMASQ
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