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feat: add native firewalld support (#1388)

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## Summary

- Add native firewalld support for RHEL/Fedora/CentOS systems
- When firewalld is active, use `firewall-cmd --permanent` instead of
raw iptables
- Rules persist across `firewall-cmd --reload`
- Fall back to iptables when firewalld is not active
- Add `After=firewalld.service` to iptables systemd unit for safety

## Changes

**Install:** Detect firewalld, use `firewall-cmd` to add port,
masquerade, and rich rules. Fall back to iptables if inactive.

**Uninstall:** Detect which method was used and clean up accordingly.

**Tests:** Add `fedora-42-firewalld` CI test with firewalld enabled.

---

Closes https://github.com/angristan/openvpn-install/issues/356
Closes https://github.com/angristan/openvpn-install/pull/1200
This commit is contained in:
Stanislas
2025-12-13 20:49:40 +01:00
committed by GitHub
parent 9175c2c221
commit d8aa625639
6 changed files with 148 additions and 56 deletions
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90
test/server-entrypoint.sh
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@@ -77,15 +77,22 @@ fi
# Verify all expected files were created
echo "Verifying installation..."
MISSING_FILES=0
for f in \
/etc/openvpn/server/server.conf \
/etc/openvpn/server/ca.crt \
/etc/openvpn/server/ca.key \
"/etc/openvpn/server/$TLS_KEY_FILE" \
/etc/openvpn/server/crl.pem \
/etc/openvpn/server/easy-rsa/pki/ca.crt \
/etc/iptables/add-openvpn-rules.sh \
/root/testclient.ovpn; do
# Build list of required files
REQUIRED_FILES=(
/etc/openvpn/server/server.conf
/etc/openvpn/server/ca.crt
/etc/openvpn/server/ca.key
"/etc/openvpn/server/$TLS_KEY_FILE"
/etc/openvpn/server/crl.pem
/etc/openvpn/server/easy-rsa/pki/ca.crt
/root/testclient.ovpn
)
# Only check for iptables script if firewalld is not active
if ! systemctl is-active --quiet firewalld; then
REQUIRED_FILES+=(/etc/iptables/add-openvpn-rules.sh)
fi
for f in "${REQUIRED_FILES[@]}"; do
if [ ! -f "$f" ]; then
echo "ERROR: Missing file: $f"
MISSING_FILES=$((MISSING_FILES + 1))
@@ -380,21 +387,58 @@ echo ""
# Verify OpenVPN server (started by systemd via install script)
echo "Verifying OpenVPN server..."
# Verify iptables NAT rules exist (applied by iptables-openvpn service)
echo "Verifying iptables NAT rules..."
for _ in $(seq 1 10); do
if iptables -t nat -L POSTROUTING -n | grep -q "10.8.0.0"; then
echo "PASS: NAT POSTROUTING rule for 10.8.0.0/24 exists"
break
# Verify firewall rules exist
echo "Verifying firewall rules..."
if systemctl is-active --quiet firewalld; then
# firewalld is active - verify masquerade is enabled
echo "firewalld detected, checking masquerade..."
for _ in $(seq 1 10); do
if firewall-cmd --query-masquerade 2>/dev/null; then
echo "PASS: firewalld masquerade is enabled"
break
fi
sleep 1
done
if ! firewall-cmd --query-masquerade 2>/dev/null; then
echo "FAIL: firewalld masquerade is not enabled"
echo "Current firewalld config:"
firewall-cmd --list-all 2>&1 || true
exit 1
fi
# Verify port is open
if firewall-cmd --list-ports | grep -q "1194/udp"; then
echo "PASS: OpenVPN port is open in firewalld"
else
echo "FAIL: OpenVPN port not found in firewalld"
firewall-cmd --list-ports
exit 1
fi
# Verify VPN subnet rich rule exists
if firewall-cmd --list-rich-rules | grep -q 'source address="10.8.0.0/24"'; then
echo "PASS: VPN subnet rich rule is configured"
else
echo "FAIL: VPN subnet rich rule not found in firewalld"
echo "Current rich rules:"
firewall-cmd --list-rich-rules
exit 1
fi
else
# iptables mode - verify NAT rules
echo "iptables mode, checking NAT rules..."
for _ in $(seq 1 10); do
if iptables -t nat -L POSTROUTING -n | grep -q "10.8.0.0"; then
echo "PASS: NAT POSTROUTING rule for 10.8.0.0/24 exists"
break
fi
sleep 1
done
if ! iptables -t nat -L POSTROUTING -n | grep -q "10.8.0.0"; then
echo "FAIL: NAT POSTROUTING rule for 10.8.0.0/24 not found"
echo "Current NAT rules:"
iptables -t nat -L POSTROUTING -n -v
systemctl status iptables-openvpn 2>&1 || true
exit 1
fi
sleep 1
done
if ! iptables -t nat -L POSTROUTING -n | grep -q "10.8.0.0"; then
echo "FAIL: NAT POSTROUTING rule for 10.8.0.0/24 not found"
echo "Current NAT rules:"
iptables -t nat -L POSTROUTING -n -v
systemctl status iptables-openvpn 2>&1 || true
exit 1
fi
# Verify IP forwarding is enabled