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-rw-r--r--app/src/main/java/org/pacien/tincapp/activities/configure/ConfigurationFtpServerFragment.kt72
-rw-r--r--app/src/main/java/org/pacien/tincapp/service/ConfigurationFtpService.kt128
2 files changed, 200 insertions, 0 deletions
diff --git a/app/src/main/java/org/pacien/tincapp/activities/configure/ConfigurationFtpServerFragment.kt b/app/src/main/java/org/pacien/tincapp/activities/configure/ConfigurationFtpServerFragment.kt
new file mode 100644
index 0000000..b97a15e
--- /dev/null
+++ b/app/src/main/java/org/pacien/tincapp/activities/configure/ConfigurationFtpServerFragment.kt
@@ -0,0 +1,72 @@
1/*
2 * Tinc App, an Android binding and user interface for the tinc mesh VPN daemon
3 * Copyright (C) 2017-2020 Pacien TRAN-GIRARD
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <https://www.gnu.org/licenses/>.
17 */
18
19package org.pacien.tincapp.activities.configure
20
21import android.content.Intent
22import android.os.Bundle
23import android.view.LayoutInflater
24import android.view.View
25import android.view.ViewGroup
26import androidx.databinding.Observable
27import androidx.databinding.ObservableBoolean
28import org.pacien.tincapp.activities.BaseFragment
29import org.pacien.tincapp.databinding.ConfigureToolsConfigurationFtpServerFragmentBinding
30import org.pacien.tincapp.service.ConfigurationFtpService
31
32/**
33 * @author pacien
34 */
35class ConfigurationFtpServerFragment : BaseFragment() {
36 private val ftpServerStartListener = object : Observable.OnPropertyChangedCallback() {
37 override fun onPropertyChanged(sender: Observable, propertyId: Int) {
38 binding.ftpEnabled = (sender as ObservableBoolean).get()
39 }
40 }
41
42 private lateinit var binding: ConfigureToolsConfigurationFtpServerFragmentBinding
43
44 override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
45 binding = ConfigureToolsConfigurationFtpServerFragmentBinding.inflate(inflater, container, false)
46 binding.ftpUsername = ConfigurationFtpService.FTP_USERNAME
47 binding.ftpPassword = ConfigurationFtpService.FTP_PASSWORD
48 binding.ftpPort = ConfigurationFtpService.FTP_PORT
49 binding.toggleFtpState = { toggleServer() }
50 return binding.root
51 }
52
53 override fun onResume() {
54 super.onResume()
55 ConfigurationFtpService.runningState.addOnPropertyChangedCallback(ftpServerStartListener)
56 binding.ftpEnabled = ConfigurationFtpService.runningState.get()
57 }
58
59 override fun onPause() {
60 ConfigurationFtpService.runningState.removeOnPropertyChangedCallback(ftpServerStartListener)
61 super.onPause()
62 }
63
64 private fun toggleServer() {
65 val targetServiceIntent = Intent(requireContext(), ConfigurationFtpService::class.java)
66
67 if (binding.ftpEnabled)
68 requireContext().stopService(targetServiceIntent)
69 else
70 requireContext().startService(targetServiceIntent)
71 }
72}
diff --git a/app/src/main/java/org/pacien/tincapp/service/ConfigurationFtpService.kt b/app/src/main/java/org/pacien/tincapp/service/ConfigurationFtpService.kt
new file mode 100644
index 0000000..c562768
--- /dev/null
+++ b/app/src/main/java/org/pacien/tincapp/service/ConfigurationFtpService.kt
@@ -0,0 +1,128 @@
1/*
2 * Tinc App, an Android binding and user interface for the tinc mesh VPN daemon
3 * Copyright (C) 2017-2020 Pacien TRAN-GIRARD
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <https://www.gnu.org/licenses/>.
17 */
18
19package org.pacien.tincapp.service
20
21import android.app.Service
22import android.content.Intent
23import android.os.IBinder
24import androidx.databinding.ObservableBoolean
25import org.apache.ftpserver.FtpServer
26import org.apache.ftpserver.FtpServerFactory
27import org.apache.ftpserver.ftplet.*
28import org.apache.ftpserver.listener.ListenerFactory
29import org.apache.ftpserver.usermanager.UsernamePasswordAuthentication
30import org.apache.ftpserver.usermanager.impl.WritePermission
31import org.pacien.tincapp.R
32import org.pacien.tincapp.context.App
33import org.pacien.tincapp.extensions.Java.defaultMessage
34import org.slf4j.LoggerFactory
35import java.io.IOException
36
37/**
38 * FTP server service allowing a remote and local user to access and modify configuration files in
39 * the application's context.
40 *
41 * @author pacien
42 */
43class ConfigurationFtpService : Service() {
44 companion object {
45 const val FTP_PORT = 65521 // tinc port `concat` FTP port
46 const val FTP_USERNAME = "tincapp"
47 val FTP_HOME_DIR = App.getContext().applicationInfo.dataDir!!
48 val FTP_PASSWORD = generateRandomString(8)
49
50 val runningState = ObservableBoolean(false)
51
52 private fun generateRandomString(length: Int): String {
53 val alphabet = ('a'..'z') + ('A'..'Z') + ('0'..'9')
54 return List(length) { alphabet.random() }.joinToString("")
55 }
56 }
57
58 private val log by lazy { LoggerFactory.getLogger(this.javaClass)!! }
59 private var sftpServer: FtpServer? = null
60
61 override fun onBind(intent: Intent): IBinder? = null // non-bindable service
62
63 override fun onDestroy() {
64 sftpServer?.stop()
65 sftpServer = null
66 runningState.set(false)
67 log.info("Stopped FTP server")
68 super.onDestroy()
69 }
70
71 override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
72 val ftpUser = StaticFtpUser(FTP_USERNAME, FTP_PASSWORD, FTP_HOME_DIR, listOf(WritePermission()))
73 sftpServer = setupSingleUserServer(ftpUser).also {
74 try {
75 it.start()
76 runningState.set(true)
77 log.info("Started FTP server on port {}", FTP_PORT)
78 } catch (e: IOException) {
79 log.error("Could not start FTP server", e)
80 App.alert(R.string.notification_error_title_unable_to_start_ftp_server, e.defaultMessage())
81 }
82 }
83
84 return START_NOT_STICKY
85 }
86
87 private fun setupSingleUserServer(ftpUser: User): FtpServer {
88 return FtpServerFactory()
89 .apply { addListener("default", ListenerFactory().apply { port = FTP_PORT }.createListener()) }
90 .apply { userManager = StaticFtpUserManager(listOf(ftpUser)) }
91 .createServer()
92 }
93
94 private class StaticFtpUserManager(users: List<User>) : UserManager {
95 private val userMap: Map<String, User> = users.map { it.name to it }.toMap()
96 override fun getUserByName(username: String?): User? = userMap[username]
97 override fun getAllUserNames(): Array<String> = userMap.keys.toTypedArray()
98 override fun doesExist(username: String?): Boolean = username in userMap
99 override fun delete(username: String?) = throw UnsupportedOperationException()
100 override fun save(user: User?) = throw UnsupportedOperationException()
101 override fun getAdminName(): String = throw UnsupportedOperationException()
102 override fun isAdmin(username: String?): Boolean = throw UnsupportedOperationException()
103 override fun authenticate(authentication: Authentication?): User = when (authentication) {
104 is UsernamePasswordAuthentication -> getUserByName(authentication.username).let {
105 if (it != null && authentication.password == it.password) it
106 else throw AuthenticationFailedException()
107 }
108 else -> throw IllegalArgumentException()
109 }
110 }
111
112 private data class StaticFtpUser(
113 private val name: String,
114 private val password: String,
115 private val homeDirectory: String,
116 private val authorities: List<Authority>
117 ) : User {
118 override fun getName(): String = name
119 override fun getPassword(): String = password
120 override fun getAuthorities(): List<Authority> = authorities
121 override fun getAuthorities(clazz: Class<out Authority>): List<Authority> = authorities.filter(clazz::isInstance)