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// Copyright (C) 2018 LEAP
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package bitmask
import (
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"math/rand"
"net/http"
"sort"
"strconv"
"strings"
"time"
)
const (
certAPI = "https://api.black.riseup.net/1/cert"
eipAPI = "https://api.black.riseup.net/1/config/eip-service.json"
secondsPerHour = 60 * 60
)
var (
caCert = []byte(`-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`)
)
type bonafide struct {
client *http.Client
eip *eipService
defaultGateway string
}
type eipService struct {
Gateways []gateway
Locations map[string]struct {
CountryCode string
Hemisphere string
Name string
Timezone string
}
OpenvpnConfiguration map[string]interface{} `json:"openvpn_configuration"`
}
type gateway struct {
Capabilities struct {
Ports []string
Protocols []string
}
Host string
IPAddress string `json:"ip_address"`
Location string
}
func newBonafide() *bonafide {
certs := x509.NewCertPool()
certs.AppendCertsFromPEM(caCert)
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: certs,
},
},
}
return &bonafide{client, nil, ""}
}
func (b *bonafide) getCertPem() ([]byte, error) {
resp, err := b.client.Post(certAPI, "", nil)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("get vpn cert has failed with status: %s", resp.Status)
}
return ioutil.ReadAll(resp.Body)
}
func (b *bonafide) getGateways() ([]gateway, error) {
if b.eip == nil {
err := b.fetchEipJSON()
if err != nil {
return nil, err
}
}
return b.eip.Gateways, nil
}
func (b *bonafide) setDefaultGateway(name string) {
b.defaultGateway = name
b.sortGateways()
}
func (b *bonafide) getOpenvpnArgs() ([]string, error) {
if b.eip == nil {
err := b.fetchEipJSON()
if err != nil {
return nil, err
}
}
args := []string{}
for arg, value := range b.eip.OpenvpnConfiguration {
switch v := value.(type) {
case string:
args = append(args, "--"+arg)
args = append(args, strings.Split(v, " ")...)
case bool:
if v {
args = append(args, "--"+arg)
}
default:
log.Printf("Uknwon openvpn argument type: %s - %v", arg, value)
}
}
return args, nil
}
func (b *bonafide) fetchEipJSON() error {
resp, err := b.client.Post(eipAPI, "", nil)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return fmt.Errorf("get vpn cert has failed with status: %s", resp.Status)
}
var eip eipService
decoder := json.NewDecoder(resp.Body)
err = decoder.Decode(&eip)
if err != nil {
return err
}
b.eip = &eip
b.sortGateways()
return nil
}
func (b *bonafide) sortGateways() {
type gatewayDistance struct {
gateway gateway
distance int
}
gws := []gatewayDistance{}
_, tzOffset := time.Now().Zone()
tzOffset = tzOffset / secondsPerHour
for _, gw := range b.eip.Gateways {
distance := 13
if gw.Location == b.defaultGateway {
distance = -1
} else {
gwOffset, err := strconv.Atoi(b.eip.Locations[gw.Location].Timezone)
if err != nil {
log.Printf("Error sorting gateways: %v", err)
} else {
distance = tzDistance(tzOffset, gwOffset)
}
}
gws = append(gws, gatewayDistance{gw, distance})
}
rand.Seed(time.Now().UnixNano())
cmp := func(i, j int) bool {
if gws[i].distance == gws[j].distance {
// TODO: a hack to distribute more the load into the new gw.
// Let's delete it as soon as is more spread the load.
if gws[i].gateway.Host == "giraffe.riseup.net" {
return rand.Intn(4) != 0
} else if gws[j].gateway.Host == "giraffe.riseup.net" {
return rand.Intn(4) == 0
}
return rand.Intn(2) == 1
}
return gws[i].distance < gws[j].distance
}
sort.Slice(gws, cmp)
for i, gw := range gws {
b.eip.Gateways[i] = gw.gateway
}
}
func tzDistance(offset1, offset2 int) int {
abs := func(x int) int {
if x < 0 {
return -x
}
return x
}
distance := abs(offset1 - offset2)
if distance > 12 {
distance = 24 - distance
}
return distance
}
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