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vpn.go
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vpn.go
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// Copyright (c) 2016 by António Meireles <antonio.meireles@reformi.st>.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package server
import (
"fmt"
"io/ioutil"
"net"
"os"
"os/exec"
"strings"
"github.com/TheNewNormal/corectl/components/host/session"
"github.com/helm/helm/log"
)
func detectVPN() (utun []string, err error) {
l, err := net.Interfaces()
if err != nil {
return
}
for _, f := range l {
if strings.HasPrefix(f.Name, "utun") {
utun = append(utun, f.Name)
}
}
return
}
func HandleVPNtunnels() (f func(), err error) {
var vpnIfs []string
if vpnIfs, err = detectVPN(); err != nil {
return
}
f = func() {
if len(vpnIfs) == 0 {
return
}
log.Info("removing custom firewall rules for VPN handling")
for _, iface := range vpnIfs {
anchorName := fmt.Sprintf("com.apple/%snat", iface)
exec.Command("pfctl", "-a", anchorName, "-F", "nat").Output()
}
}
if len(vpnIfs) > 0 {
log.Info("VPN detected: tweaking host firewall")
for _, iface := range vpnIfs {
var ruleFile *os.File
anchorName := fmt.Sprintf("com.apple/%snat", iface)
if ruleFile, err = ioutil.TempFile("", "coreos"); err != nil {
return
}
r := fmt.Sprintf("nat on {%s} proto {tcp, udp, icmp} "+
"from %s/24 to any -> {%s}\n",
iface, session.Caller.Network.Base(), iface)
ruleFile.Write([]byte(r))
ruleFile.Close()
defer os.RemoveAll(ruleFile.Name())
if _, err = exec.Command("pfctl",
"-a", anchorName, "-f", ruleFile.Name()).Output(); err != nil {
return
}
}
}
return
}