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authorpacien2020-12-08 16:16:08 +0100
committerpacien2020-12-08 16:16:08 +0100
commit20ecd9840f1e237dba79674b71e49b43b074902e (patch)
tree4594947f1faf96e9851d95c9cfc7bfad0c9ff923 /app/src/main/java/org/pacien
parentb1f98caca2f6960f7abb3ef7f7c27b903e1ef929 (diff)
downloadtincapp-20ecd9840f1e237dba79674b71e49b43b074902e.tar.gz
app: add configuration FTP server
This is a ridiculous workaround to make the configuration (and other files) accessible to the user necessary after the new storage access restriction enforced in Android 11 which prevent other applications from accessing the supposedly public application's directory. The app's internal private storage directory is now exposed to the user through an embedded FTP server that the user can turn on and off from the configuration activity. The user can then play with the configuration and retrieve logs through a remote or local FTP client application of their choice. GitHub: closes #103
Diffstat (limited to 'app/src/main/java/org/pacien')
-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