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Fix for firewall on Docker Desktop on Mac #10

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Merged
mreuvekamp merged 2 commits into from
May 8, 2026
+18 −1
Merged

Fix for firewall on Docker Desktop on Mac #10

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cbeb9e6
Fix for firewall on Docker Desktop on Mac
uittenbroekrobbert May 7, 2026
f2c19ff
statsig.anthropic.com resolved niet meer
ericwout-overheid May 8, 2026
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19 changes: 18 additions & 1 deletion claude-sandbox/init-firewall.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -120,7 +120,6 @@ if [ "$OPEN_HTTPS" != "true" ]; then
"registry.npmjs.org"
"api.anthropic.com"
"sentry.io"
"statsig.anthropic.com"
"statsig.com"
"marketplace.visualstudio.com"
"vscode.blob.core.windows.net"
Expand Down Expand Up @@ -206,6 +205,24 @@ iptables -A OUTPUT -d "$HOST_NETWORK" -j ACCEPT
iptables -A OUTPUT -d 127.0.0.11 -p udp --dport 53 -j ACCEPT
iptables -A OUTPUT -d 127.0.0.11 -p tcp --dport 53 -j ACCEPT

# Whitelist nameservers (and Docker Desktop ExtServers) from /etc/resolv.conf.
# On Docker Desktop the embedded resolver DNATs 127.0.0.11:53 to an upstream IP
# annotated as `# ExtServers: [<ip>]` in resolv.conf — that IP is outside
# HOST_NETWORK and would otherwise be rejected after lockdown. On Linux Docker
# resolv.conf only lists 127.0.0.11 (already covered by loopback ACCEPT), so the
# extra rules are a harmless no-op there.
while IFS= read -r ns; do
[ -z "$ns" ] && continue
if [[ "$ns" =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
iptables -A OUTPUT -d "$ns" -p udp --dport 53 -j ACCEPT
iptables -A OUTPUT -d "$ns" -p tcp --dport 53 -j ACCEPT
echo "Whitelisted nameserver: $ns"
fi
done < <({
awk '/^nameserver / {print $2}' /etc/resolv.conf
awk -F'[][]' '/^# ExtServers:/ {gsub(/[ ,]+/, "\n", $2); print $2}' /etc/resolv.conf
})

# When not using OPEN_HTTPS, allow only specific outbound traffic to allowed domains
if [ "$OPEN_HTTPS" != "true" ]; then
iptables -A OUTPUT -p tcp --dport 443 -m set --match-set allowed-domains dst -j ACCEPT
Expand Down