summaryrefslogtreecommitdiff
path: root/pkg/vpn/bonafide/auth_sip.go
blob: 0c8ee4f1dc60aff737adce75702676e91359c6b0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
// 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 (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"path"
	"strings"
	"time"

	"0xacab.org/leap/bitmask-vpn/pkg/config"
)

type sipAuthentication struct {
	client  httpClient
	authURI string
}

func (a *sipAuthentication) needsCredentials() bool {
	return true
}

func (a *sipAuthentication) getToken(user, password string) ([]byte, error) {
	/* TODO refresh session token periodically */
	if hasRecentToken() {
		return readToken()
	}
	credJSON, err := formatCredentials(user, password)
	if err != nil {
		return nil, fmt.Errorf("Cannot encode credentials: %s", err)
	}
	resp, err := a.client.Post(a.authURI, "text/json", strings.NewReader(credJSON))
	if err != nil {
		return nil, fmt.Errorf("Error on auth request: %v", err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != 200 {
		return nil, fmt.Errorf("Cannot get token: Error %d", resp.StatusCode)
	}
	token, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}
	writeToken(token)
	return token, nil
}

func getTokenPath() string {
	return path.Join(config.Path, config.ApplicationName+".token")
}

func writeToken(token []byte) {
	tp := getTokenPath()
	err := ioutil.WriteFile(tp, token, 0600)
	if err != nil {
		log.Println("BUG: cannot write token to", tp)
	}
}

func readToken() ([]byte, error) {
	f, err := os.Open(getTokenPath())
	if err != nil {
		log.Println("Error: cannot open token file")
		return nil, err
	}
	token, err := ioutil.ReadAll(f)
	if err != nil {
		log.Println("Error: cannot read token")
		return nil, err
	}
	return token, nil
}

func hasRecentToken() bool {
	statinfo, err := os.Stat(getTokenPath())
	if err != nil {
		return false
	}
	lastWrote := statinfo.ModTime().Unix()
	/* in vpnweb we set the duration of the token to 24 hours */
	old := time.Now().Add(-time.Hour * 20).Unix()
	return lastWrote >= old
}

func formatCredentials(user, pass string) (string, error) {
	c := credentials{User: user, Password: pass}
	credJSON, err := json.Marshal(c)
	if err != nil {
		return "", err
	}
	return string(credJSON), nil
}