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Fix egress DNS deployment firewall #9

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Merged
arslnb merged 1 commit into from
Jun 26, 2026
+13 −1
Merged

Fix egress DNS deployment firewall #9

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8 changes: 8 additions & 0 deletions deploy/install.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,8 @@ if [[ -f "$(dirname "$0")/nftables/sandbox-nat.nft" ]]; then
install -m 0644 "$(dirname "$0")/nftables/sandbox-nat.nft" /etc/nftables.d/sandbox-nat.nft
else
cat > /etc/nftables.d/sandbox-nat.nft <<'NFT'
destroy table inet sandboxd

table inet sandboxd {
define SANDBOX_NET = 10.200.0.0/16
define HOST_DNS = 10.200.0.1
Expand Down Expand Up @@ -187,6 +189,12 @@ nft -f /etc/nftables.d/sandbox-nat.nft 2>/dev/null || warn "nft apply deferred u
sysctl -qw net.ipv4.ip_forward=1
echo 'net.ipv4.ip_forward=1' >/etc/sysctl.d/99-workdir.conf

if command -v ufw >/dev/null 2>&1; then
ufw allow in on wdbr0 to 10.200.0.1 port 53 proto udp >/dev/null 2>&1 || true
ufw allow in on wdbr0 to 10.200.0.1 port 53 proto tcp >/dev/null 2>&1 || true
ufw reload >/dev/null 2>&1 || true
fi

# ---------------------------------------------------------------------------
# 6. Config + systemd unit
# ---------------------------------------------------------------------------
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2 changes: 2 additions & 0 deletions deploy/nftables/sandbox-nat.nft
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Expand Up @@ -8,6 +8,8 @@
# Apply with: nft -f /etc/nftables.d/sandbox-nat.nft
# Persist via /etc/nftables.conf `include "/etc/nftables.d/*.nft"`.

destroy table inet sandboxd

table inet sandboxd {
# Sandboxes live on this private supernet; one /30 (or tap) per microVM.
define SANDBOX_NET = 10.200.0.0/16
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4 changes: 3 additions & 1 deletion deploy/provision-node.sh
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Expand Up @@ -149,10 +149,12 @@ systemctl enable --now workdir-net >/dev/null 2>&1
if command -v ufw >/dev/null 2>&1; then
sed -i 's/^DEFAULT_FORWARD_POLICY=.*/DEFAULT_FORWARD_POLICY="ACCEPT"/' /etc/default/ufw
ufw allow 22/tcp >/dev/null 2>&1 || true
ufw allow in on ${BRIDGE} to 10.200.0.1 port 53 proto udp >/dev/null 2>&1 || true
ufw allow in on ${BRIDGE} to 10.200.0.1 port 53 proto tcp >/dev/null 2>&1 || true
yes | ufw enable >/dev/null 2>&1 || true
ufw reload >/dev/null 2>&1 || true
fi
log " uplink=$UPLINK, forwarding on, ufw routes allowed"
log " uplink=$UPLINK, forwarding on, controlled DNS allowed"

# --- 5. build the daemon ---------------------------------------------------
if ! command -v cargo >/dev/null 2>&1; then
Expand Down