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some rssh stuff

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This commit is contained in:
Anton Afanasyeu
2026-06-15 13:34:19 +02:00
parent d29c212297
commit 066e21a3f2
6 changed files with 92 additions and 14 deletions
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3
app/build.gradle
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@@ -119,6 +119,7 @@ android {
excludes += '/META-INF/LICENSE.txt'
excludes += '/META-INF/NOTICE'
excludes += '/META-INF/NOTICE.txt'
excludes += '/META-INF/versions/**'
}
}
@@ -146,6 +147,8 @@ dependencies {
implementation 'com.github.mwiede:jsch:0.2.21'
implementation 'org.apache.sshd:sshd-core:2.14.0'
implementation 'org.apache.sshd:sshd-sftp:2.14.0'
implementation 'org.bouncycastle:bcprov-jdk18on:1.78.1'
implementation 'org.slf4j:slf4j-android:1.7.36'
implementation project(':tunnel')

3
app/src/main/assets/licenses/combined.html
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@@ -19,7 +19,8 @@
<li><b>Google Play In-App Review</b> — Google Play SDK terms</li>
<li><b>Eclipse Paho MQTT client</b> — Eclipse Public License 1.0 and Eclipse Distribution License 1.0 (dual-licensed)</li>
<li><b>JSch (mwiede fork)</b> — BSD 3-Clause License (reverse SSH remote access)</li>
<li><b>Apache MINA SSHD</b> — Apache License 2.0 (embedded local SSH on device for RSSH alpha)</li>
<li><b>Apache MINA SSHD</b> — Apache License 2.0 (embedded local SSH/SFTP for RSSH alpha)</li>
<li><b>Bouncy Castle</b> — MIT-style license (SSHD crypto on Android)</li>
</ul>
<h2>JUnit 4</h2>

2
app/src/main/java/com/foxx/androidcast/remoteaccess/ReverseSshTunnelBridge.java
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@@ -42,7 +42,7 @@ public final class ReverseSshTunnelBridge {
Log.w(TAG, "incomplete RSSH credentials");
return false;
}
if (!RsshLocalSshServer.start(user, pass, localPort)) {
if (!RsshLocalSshServer.start(context, user, pass, localPort)) {
Log.w(TAG, "local SSH on :" + localPort + " failed");
return false;
}

23
app/src/main/java/com/foxx/androidcast/remoteaccess/RsshLocalSshServer.java
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@@ -1,18 +1,19 @@
package com.foxx.androidcast.remoteaccess;
import android.content.Context;
import android.util.Log;
import org.apache.sshd.server.SshServer;
import org.apache.sshd.server.auth.password.PasswordAuthenticator;
import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
import org.apache.sshd.server.shell.ProcessShellFactory;
import org.apache.sshd.sftp.server.SftpSubsystemFactory;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Embedded SSH on {@code 127.0.0.1:8022} for RSSH reverse forward target.
* Embedded SSH/SFTP on {@code 127.0.0.1:8022} for RSSH reverse forward target.
* Operator reaches this via bastion forwarded port (same username/password).
*/
public final class RsshLocalSshServer {
@@ -24,9 +25,10 @@ public final class RsshLocalSshServer {
private RsshLocalSshServer() {}
public static boolean start(String username, String password, int port) {
public static boolean start(Context context, String username, String password, int port) {
stop();
if (username == null || username.isEmpty() || password == null || password.isEmpty()) {
if (context == null || username == null || username.isEmpty()
|| password == null || password.isEmpty()) {
return false;
}
if (port <= 0 || port > 65535) {
@@ -36,8 +38,8 @@ public final class RsshLocalSshServer {
final String pass = password;
final int listenPort = port;
try {
Path hostKey = Files.createTempFile("rssh_host", ".key");
hostKey.toFile().deleteOnExit();
RsshSecuritySetup.ensureReady(context);
java.nio.file.Path hostKey = context.getCacheDir().toPath().resolve("rssh_host.key");
SshServer sshd = SshServer.setUpDefaultServer();
sshd.setHost("127.0.0.1");
sshd.setPort(listenPort);
@@ -45,14 +47,15 @@ public final class RsshLocalSshServer {
sshd.setPasswordAuthenticator((PasswordAuthenticator) (u, p, session) ->
user.equals(u) && pass.equals(p));
sshd.setShellFactory(new ProcessShellFactory("/system/bin/sh", "-"));
sshd.setSubsystemFactories(Collections.singletonList(new SftpSubsystemFactory()));
sshd.start();
server = sshd;
activeUser = user;
running.set(true);
Log.i(TAG, "local SSH listening 127.0.0.1:" + listenPort + " user=" + user);
Log.i(TAG, "local SSH/SFTP listening 127.0.0.1:" + listenPort + " user=" + user);
return true;
} catch (Exception e) {
Log.w(TAG, "local SSH start failed: " + e.getMessage());
} catch (Throwable e) {
Log.e(TAG, "local SSH start failed: " + e.getMessage(), e);
stop();
return false;
}

45
app/src/main/java/com/foxx/androidcast/remoteaccess/RsshSecuritySetup.java Normal file
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@@ -0,0 +1,45 @@
package com.foxx.androidcast.remoteaccess;
import android.content.Context;
import android.util.Log;
import org.apache.sshd.common.util.OsUtils;
import org.apache.sshd.common.util.io.PathUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.nio.file.Path;
import java.security.Security;
import java.util.concurrent.atomic.AtomicBoolean;
/** One-time MINA SSHD + BouncyCastle setup for Android (see mina-sshd docs/android.md). */
final class RsshSecuritySetup {
private static final String TAG = "RsshSecurity";
private static final AtomicBoolean READY = new AtomicBoolean(false);
private RsshSecuritySetup() {}
static void ensureReady(Context context) {
if (!READY.compareAndSet(false, true)) {
return;
}
Context app = context.getApplicationContext();
try {
try {
Security.removeProvider(BouncyCastleProvider.PROVIDER_NAME);
} catch (Exception ignored) {
}
if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null) {
Security.addProvider(new BouncyCastleProvider());
}
Path home = app.getFilesDir().toPath();
System.setProperty("user.home", home.toString());
PathUtils.setUserHomeFolderResolver(() -> home);
OsUtils.setCurrentUser(app.getPackageName());
Log.i(TAG, "SSHD security providers ready; user.home=" + home);
} catch (Exception e) {
READY.set(false);
Log.e(TAG, "SSHD security setup failed: " + e.getMessage(), e);
throw new IllegalStateException("RSSH security setup failed", e);
}
}
}