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wg firewall: the workout poke moves to tcp/8774 (8773 is book-guard's desktop wrapper); applied on the host 2026-10-10, phone reaches 8774 over the LAN
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KrBEzjPRdx5oyp8NtTLW5F
This commit is contained in:
Krzysztof Rudnicki 2026-10-10 09:57:29 +02:00
parent 46d07f6b75
commit b8d0b215e1
4 changed files with 47 additions and 16 deletions
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31
docs/superpowers/evidence/wg-firewall-workout-poke-8774-2026-10-10.json Normal file
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@ -0,0 +1,31 @@
{
"intent": "The phone's instant workout poke reaches screen-locker on tcp/8774; tcp/8773 is left to book-guard's desktop wrapper (loopback), whose window the poke server had been answering.",
"scope": [
"linux_configuration/features/lib/wg_firewall.sh, wg_sshd.sh, tests/test_wg_firewall.sh",
"Non-goal: any other firewall rule; the poke stays LAN-only with no wg0 rule"
],
"changes": [
"LAN-only poke rule renders 'ip saddr <LAN> tcp dport 8774 accept' instead of 8773",
"allow-workout-poke help and confirmation text name tcp/8774"
],
"verification": [
{
"command": "bash linux_configuration/features/lib/tests/test_wg_firewall.sh",
"result": "pass",
"evidence": "18 passed, 0 failed (nft -c skipped: not permitted unprivileged)"
},
{
"command": "vm run pokefw 'echo y | sudo bash ~/lc/features/setup_wireguard_ssh.sh allow-workout-poke'",
"result": "pass",
"evidence": "vmbox: exit 0, live ruleset has 'ip saddr 192.168.1.0/24 tcp dport 8774 accept', no 8773 rule, sshd active, second ssh session connects. Not verified on the host at commit time."
}
],
"risks": [
"Until the host re-applies, the live ruleset still opens 8773 (nothing listens on the LAN there) and blocks 8774, so the poke fails fast and the regular sync credits workouts",
"nftables-drift reports drift until the host re-applies"
],
"rollback": [
"git revert, then sudo bash linux_configuration/features/setup_wireguard_ssh.sh allow-workout-poke",
"Check: sudo nft list ruleset | grep 877 shows the restored port"
]
}

24
linux_configuration/features/lib/tests/test_wg_firewall.sh
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@ -64,23 +64,23 @@ else
_t_pass "ALLOW_DOT=false renders no 853 rule"
fi
printf '\n-- the workout poke is LAN-only --\n'
if grep -q 'dport 8773' "$RULES"; then
_t_fail "ALLOW_WORKOUT_POKE unset renders no 8773 rule"
if grep -q 'dport 8774' "$RULES"; then
_t_fail "ALLOW_WORKOUT_POKE unset renders no 8774 rule"
else
_t_pass "ALLOW_WORKOUT_POKE unset renders no 8773 rule"
_t_pass "ALLOW_WORKOUT_POKE unset renders no 8774 rule"
fi
ALLOW_WORKOUT_POKE="true"
render_nftables_ruleset "$RULES"
_t_file_has "$RULES" 'ip saddr 192.168.1.0/24 tcp dport 8773 accept' \
"ALLOW_WORKOUT_POKE opens 8773 to the LAN subnet"
_t_eq "1" "$(grep -c 'dport 8773' "$RULES")" \
"exactly one 8773 rule: no wg0 rule, the poke never rides WireGuard"
_t_file_has "$RULES" 'ip saddr 192.168.1.0/24 tcp dport 8774 accept' \
"ALLOW_WORKOUT_POKE opens 8774 to the LAN subnet"
_t_eq "1" "$(grep -c 'dport 8774' "$RULES")" \
"exactly one 8774 rule: no wg0 rule, the poke never rides WireGuard"
ALLOW_WORKOUT_POKE="false"
render_nftables_ruleset "$RULES"
if grep -q 'dport 8773' "$RULES"; then
_t_fail "ALLOW_WORKOUT_POKE=false renders no 8773 rule"
if grep -q 'dport 8774' "$RULES"; then
_t_fail "ALLOW_WORKOUT_POKE=false renders no 8774 rule"
else
_t_pass "ALLOW_WORKOUT_POKE=false renders no 8773 rule"
_t_pass "ALLOW_WORKOUT_POKE=false renders no 8774 rule"
fi
if command -v nft >/dev/null 2>&1; then
ALLOW_DOT="true"
@ -134,8 +134,8 @@ out="$(allow_workout_poke 2>&1)"
mapfile -t calls <"$TEST_TMPDIR/calls.log"
_t_eq "save_config ALLOW_WORKOUT_POKE=true|apply" "$(IFS='|' && printf '%s' "${calls[*]}")" \
"the flag is saved as true before the ruleset is applied"
_t_file_has "${NFT_CONF}.new" 'ip saddr 192.168.1.0/24 tcp dport 8773 accept' \
"the applied ruleset carries the LAN-only 8773 rule"
_t_file_has "${NFT_CONF}.new" 'ip saddr 192.168.1.0/24 tcp dport 8774 accept' \
"the applied ruleset carries the LAN-only 8774 rule"
_t_has "$out" 'not wg0' "the confirmation says the port stays off WireGuard"
_t_report "test_wg_firewall.sh"

6
linux_configuration/features/lib/wg_firewall.sh
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@ -36,12 +36,12 @@ render_nftables_ruleset() {
ha_rule+=$'\n\t\tiifname "'"${WG_IFACE}"$'" tcp dport 8123 accept'
fi
# Workout poke (screen-locker workout-poke.service): the phone POSTs a
# finished workout to tcp/8773 the moment it ends. LAN only, deliberately
# finished workout to tcp/8774 the moment it ends. LAN only, deliberately
# NO wg0 rule: off the home LAN the poke fails fast and the normal sync
# credits the workout instead.
local poke_rule=""
if [[ ${ALLOW_WORKOUT_POKE:-false} == "true" ]]; then
poke_rule=$'\n\t\tip saddr '"${LAN_SUBNET}"$' tcp dport 8773 accept'
poke_rule=$'\n\t\tip saddr '"${LAN_SUBNET}"$' tcp dport 8774 accept'
fi
# DNS-over-TLS (setup_dot_resolver.sh, bound to the WireGuard address):
# rendered here so a re-apply keeps it -- a runtime 'nft add rule' did not.
@ -185,5 +185,5 @@ allow_workout_poke() {
save_config
write_nftables_ruleset
verify_nftables_then_apply
log_ok "Opened tcp/8773 from ${LAN_SUBNET:-the LAN} only, not ${WG_IFACE} (persisted)."
log_ok "Opened tcp/8774 from ${LAN_SUBNET:-the LAN} only, not ${WG_IFACE} (persisted)."
}

2
linux_configuration/features/lib/wg_sshd.sh
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@ -236,7 +236,7 @@ Commands:
allow-web Open tcp/80 and tcp/443 in the firewall (for a web server on this host).
allow-dns Open udp/tcp 53 from the LAN in the firewall (for the DNS blocker on this host).
allow-dot Open tcp/853 on wg0 in the firewall (for the DoT resolver on this host).
allow-workout-poke Open tcp/8773 from the LAN only (screen-locker's workout poke).
allow-workout-poke Open tcp/8774 from the LAN only (screen-locker's workout poke).
verify Check /etc/nftables.conf matches this script and that
the live forward chain still lets Docker through.
install-verify Install the units that run 'verify' at every boot, so