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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 bonafide
import (
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"time"
"0xacab.org/leap/bitmask-vpn/pkg/config"
)
const (
certAPI = config.APIURL + "1/cert"
certAPI3 = config.APIURL + "3/cert"
secondsPerHour = 60 * 60
retryFetchJSONSeconds = 15
)
type Bonafide struct {
client httpClient
eip *eipService
tzOffsetHours int
}
type Gateway struct {
Host string
IPAddress string
Location string
Ports []string
Protocols []string
Options map[string]string
}
type openvpnConfig map[string]interface{}
type httpClient interface {
Post(url, contentType string, body io.Reader) (resp *http.Response, err error)
}
type geoLocation struct {
IPAddress string `json:"ip"`
Country string `json:"cc"`
City string `json:"city"`
Latitude float64 `json:"lat"`
Longitude float64 `json:"lon"`
SortedGateways []string `json:"gateways"`
}
func New() *Bonafide {
certs := x509.NewCertPool()
certs.AppendCertsFromPEM(config.CaCert)
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
RootCAs: certs,
},
},
}
_, tzOffsetSeconds := time.Now().Zone()
tzOffsetHours := tzOffsetSeconds / secondsPerHour
return &Bonafide{
client: client,
eip: nil,
tzOffsetHours: tzOffsetHours,
}
}
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 == 404 {
resp, err = b.client.Post(certAPI3, "", 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(transport string) ([]Gateway, error) {
if b.eip == nil {
err := b.fetchEipJSON()
if err != nil {
return nil, err
}
}
return b.eip.getGateways(transport), nil
}
func (b *Bonafide) SetDefaultGateway(name string) {
b.eip.setDefaultGateway(name)
b.sortGateways()
}
func (b *Bonafide) GetOpenvpnArgs() ([]string, error) {
if b.eip == nil {
err := b.fetchEipJSON()
if err != nil {
return nil, err
}
}
return b.eip.getOpenvpnArgs(), nil
}
func (b *Bonafide) fetchGeolocation() ([]string, error) {
resp, err := b.client.Post(config.GeolocationAPI, "", nil)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("get geolocation failed with status: %s", resp.Status)
}
geo := &geoLocation{}
dataJSON, err := ioutil.ReadAll(resp.Body)
err = json.Unmarshal(dataJSON, &geo)
if err != nil {
_ = fmt.Errorf("get vpn cert has failed with status: %s", resp.Status)
return nil, err
}
return geo.SortedGateways, nil
}
func (b *Bonafide) sortGateways() {
geolocatedGateways, _ := b.fetchGeolocation()
if len(geolocatedGateways) > 0 {
b.eip.sortGatewaysByGeolocation(geolocatedGateways)
} else {
log.Printf("Falling back to timezone heuristic for gateway selection")
b.eip.sortGatewaysByTimezone(b.tzOffsetHours)
}
}
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