From 9885228c89ca6da1835c1c3e098c92589d76301e Mon Sep 17 00:00:00 2001
From: Mathieu Baudier <mbaudier@argeo.org>
Date: Thu, 5 Sep 2019 20:53:03 +0200
Subject: [PATCH] Introduce SSH server.

---
 .../src/org/argeo/ssh/SimpleSshServer.java    | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 org.argeo.core/src/org/argeo/ssh/SimpleSshServer.java

diff --git a/org.argeo.core/src/org/argeo/ssh/SimpleSshServer.java b/org.argeo.core/src/org/argeo/ssh/SimpleSshServer.java
new file mode 100644
index 000000000..801384513
--- /dev/null
+++ b/org.argeo.core/src/org/argeo/ssh/SimpleSshServer.java
@@ -0,0 +1,102 @@
+package org.argeo.ssh;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.apache.sshd.server.SshServer;
+import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
+import org.apache.sshd.server.scp.ScpCommandFactory;
+import org.apache.sshd.server.shell.ProcessShellFactory;
+import org.argeo.util.OS;
+
+/** A simple SSH server with some defaults. Supports SCP. */
+public class SimpleSshServer {
+	private Integer port;
+	private Path hostKeyPath;
+
+	private SshServer sshd = null;
+
+	public SimpleSshServer(Integer port, Path hostKeyPath) {
+		this.port = port;
+		this.hostKeyPath = hostKeyPath;
+	}
+
+	public void init() {
+		try {
+			sshd = SshServer.setUpDefaultServer();
+			sshd.setPort(port);
+			if (hostKeyPath == null)
+				throw new IllegalStateException("An SSH server key must be set");
+			sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider(hostKeyPath));
+			// sshd.setShellFactory(new ProcessShellFactory(new String[] { "/bin/sh", "-i",
+			// "-l" }));
+			String[] shellCommand = OS.LOCAL.getDefaultShellCommand();
+			sshd.setShellFactory(new ProcessShellFactory(shellCommand));
+			sshd.setCommandFactory(new ScpCommandFactory());
+			sshd.start();
+		} catch (Exception e) {
+			throw new RuntimeException("Cannot start SSH server on port " + port, e);
+		}
+	}
+
+	public void destroy() {
+		try {
+			sshd.stop();
+		} catch (IOException e) {
+			throw new RuntimeException("Cannot stop SSH server on port " + port, e);
+		}
+	}
+
+	public Integer getPort() {
+		return port;
+	}
+
+	public void setPort(Integer port) {
+		this.port = port;
+	}
+
+	public Path getHostKeyPath() {
+		return hostKeyPath;
+	}
+
+	public void setHostKeyPath(Path hostKeyPath) {
+		this.hostKeyPath = hostKeyPath;
+	}
+
+	public static void main(String[] args) {
+		int port = 2222;
+		Path hostKeyPath = Paths.get("hostkey.ser");
+		try {
+			if (args.length > 0)
+				port = Integer.parseInt(args[0]);
+			if (args.length > 1)
+				hostKeyPath = Paths.get(args[1]);
+		} catch (Exception e1) {
+			printUsage();
+		}
+
+		SimpleSshServer sshServer = new SimpleSshServer(port, hostKeyPath);
+		sshServer.init();
+		Runtime.getRuntime().addShutdownHook(new Thread("Shutdown SSH server") {
+
+			@Override
+			public void run() {
+				sshServer.destroy();
+			}
+		});
+		try {
+			synchronized (sshServer) {
+				sshServer.wait();
+			}
+		} catch (InterruptedException e) {
+			sshServer.destroy();
+		}
+
+	}
+
+	public static void printUsage() {
+		System.out.println("java " + SimpleSshServer.class.getName() + " [port] [server key path]");
+	}
+
+}
-- 
2.30.2