forked from cyphar/mkonion
/
main.go
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/
main.go
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// mkonion: create a Tor onion service for existing Docker containers
// Copyright (C) 2016 Aleksa Sarai <cyphar@cyphar.com>
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// 1. The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package main
import (
"flag"
"fmt"
"io/ioutil"
"strconv"
"strings"
log "github.com/Sirupsen/logrus"
"github.com/docker/engine-api/client"
)
func IsInteger(s string) bool {
_, err := strconv.Atoi(s)
return err == nil
}
func mkonion() (err error) {
var (
oMappings *flagList = new(flagList)
oPrivateKey string
)
flag.Var(oMappings, "p", "specify a list of port mappings of the form '[onion:]container'")
flag.StringVar(&oPrivateKey, "k", "", "specify a private_key to use for the hidden service")
flag.Parse()
oTargetContainer := flag.Arg(0)
if flag.NArg() != 1 || oTargetContainer == "" {
flag.Usage()
return fmt.Errorf("must specify a container to create an onion service for")
}
// Load the private key.
var privatekey []byte
if oPrivateKey != "" {
pk, err := ioutil.ReadFile(oPrivateKey)
if err != nil {
return fmt.Errorf("reading private key: %s", err)
}
// -k is technically unsafe if you don't know what it does
log.WithFields(log.Fields{
"keypath": oPrivateKey,
}).Warn("using the -k option results in your private key being embedded in the resulting image: do not share the image or any images derived from it with anybody")
privatekey = pk
}
// Check the validity of arguments here.
for _, arg := range *oMappings {
ports := strings.SplitN(arg, ":", 2)
if len(ports) == 0 || len(ports) > 2 {
return fmt.Errorf("port mappings must be of the form '[onion:]container'")
}
for _, port := range ports {
if !IsInteger(port) {
return fmt.Errorf("port mappings must be integers")
}
}
}
cli, err := client.NewEnvClient()
if err != nil {
return fmt.Errorf("connecting to client: %s", err)
}
ident := generateIdentifier()
networkID, err := CreateOnionNetwork(cli, ident)
if err != nil {
return fmt.Errorf("creating onion network: %s", err)
}
log.WithFields(log.Fields{
"network": ident,
}).Info("created onion network")
defer func() {
if err != nil {
if err := PurgeOnionNetwork(cli, networkID); err != nil {
log.Warnf("purge onion network: %s", err)
}
}
}()
if err := ConnectOnionNetwork(cli, oTargetContainer, networkID); err != nil {
return fmt.Errorf("connecting target to onion network: %s", err)
}
log.WithFields(log.Fields{
"network": ident,
"container": oTargetContainer,
}).Info("attached container to onion network")
ip, err := FindOnionIPAddress(cli, oTargetContainer, networkID)
if err != nil {
return fmt.Errorf("finding target onion ip: %s", err)
}
log.WithFields(log.Fields{
"network": ident,
"container": oTargetContainer,
"ip": ip,
}).Info("found target address")
ports, err := FindTargetPorts(cli, oTargetContainer)
if err != nil {
return fmt.Errorf("finding target ports: %s", err)
}
// Add all exposed ports naively to mappings before parsing arguments.
portMappings := map[string]string{}
for _, port := range ports {
log.Infof("forwarding port: %s", port)
if port.Proto() != "tcp" {
log.Warn("encountered non-TCP exposed port in container: %s", port)
}
portMappings[port.Port()] = port.Port()
}
// Now deal with arguments.
for _, arg := range *oMappings {
var onion, container string
ports := strings.SplitN(arg, ":", 2)
onion = ports[0]
// The format is [onion:]container.
switch len(ports) {
case 2:
container = ports[1]
case 1:
container = ports[0]
default:
return fmt.Errorf("port mappings must be of the form '[onion:]container'")
}
// Can't redefine external mappings.
if _, ok := portMappings[onion]; ok {
return fmt.Errorf("cannot have multiple definitons of onion port mappings")
}
portMappings[onion] = container
}
torrc, err := GenerateConfig(cli, GenerateTargetMappings(ip, portMappings))
if err != nil {
return fmt.Errorf("generating torrc: %s", err)
}
log.Info("generated torrc config")
buildOptions := &FakeBuildOptions{
ident: ident,
networkID: networkID,
torrc: torrc,
privatekey: privatekey,
}
containerID, err := FakeBuildRun(cli, buildOptions)
if err != nil {
return fmt.Errorf("starting tor daemon: %s", err)
}
log.WithFields(log.Fields{
"container": containerID,
}).Infof("tor daemon started")
// XXX: This has issues because we need to wait for Tor to make a hostname.
onionAddr, err := GetOnionHostname(cli, containerID)
if err != nil {
return fmt.Errorf("get onion hostname: %s", err)
}
log.WithFields(log.Fields{
"onion": onionAddr,
}).Infof("retrieved Tor onion address")
return nil
}
func main() {
if err := mkonion(); err != nil {
log.Fatal(err)
}
}