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echo-sshd-server
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Ng Yat Yan 1 month ago
commit a4aec058a1
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4
.gitignore vendored
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/target/
/.classpath
/.project
/.settings

1
conf/.gitignore vendored
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/private.key

23
conf/log4j2.xml
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<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="DEBUG">
<Appenders>
<Console name="LogToConsole" target="SYSTEM_OUT">
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %p [%t] %c : %m%n" />
</Console>
<RollingFile name="LogToFile"
filePattern="logs/server.%d{yyyy-MM-dd}.log"
immediateFlush="true">
<PatternLayout
pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %p [%t] %c : %m%n" />
<Policies>
<TimeBasedTriggeringPolicy interval="1" modulate="true" />
</Policies>
</RollingFile>
</Appenders>
<Loggers>
<Root level="info">
<AppenderRef ref="LogToConsole" />
</Root>
</Loggers>
</Configuration>

4
conf/springboot.yml
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ssh-server:
port: 1022
private-key:
location: "conf/private.key"

99
pom.xml
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<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example.sshd</groupId>
<artifactId>echo-sshd-server</artifactId>
<version>1.0.0</version>
<name>ECHO SSH SERVER</name>
<description>Learning Apache Mina SSHD library</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.3.2</version>
</parent>
<properties>
<mina.version>2.0.25</mina.version>
<sshd.version>0.14.0</sshd.version>
<bouncycastle.version>1.78.1</bouncycastle.version>
<commons-io.version>2.13.0</commons-io.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<dependency>
<groupId>org.apache.mina</groupId>
<artifactId>mina-core</artifactId>
<version>${mina.version}</version>
</dependency>
<dependency>
<groupId>org.apache.sshd</groupId>
<artifactId>sshd-core</artifactId>
<version>${sshd.version}</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk18on</artifactId>
<version>${bouncycastle.version}</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk18on</artifactId>
<version>${bouncycastle.version}</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>${commons-io.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>17</source>
<target>17</target>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>com.example.sshd.Boot</mainClass>
</configuration>
<executions>
<execution>
<id>build-info</id>
<goals>
<goal>build-info</goal>
</goals>
</execution>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

31
src/main/java/com/example/sshd/Boot.java
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package com.example.sshd;
import org.apache.sshd.SshServer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Boot {
private static final Logger logger = LoggerFactory.getLogger(Boot.class);
@Autowired
protected SshServer sshd;
public static void main(String[] args) throws Exception {
String configDirectory = "conf";
if (args.length > 0) {
configDirectory = args[0];
}
logger.info("config directory: {}", configDirectory);
if (new java.io.File(configDirectory).exists() && new java.io.File(configDirectory).isDirectory()) {
System.setProperty("spring.config.location", configDirectory + "/springboot.yml");
System.setProperty("logging.config", configDirectory + "/log4j2.xml");
}
SpringApplication.run(Boot.class, args);
}
}

121
src/main/java/com/example/sshd/config/EchoShellFactory.java
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package com.example.sshd.config;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.UUID;
import org.apache.commons.lang3.StringUtils;
import org.apache.sshd.common.Factory;
import org.apache.sshd.server.Command;
import org.apache.sshd.server.Environment;
import org.apache.sshd.server.ExitCallback;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class EchoShellFactory implements Factory<Command> {
private static final Logger logger = LoggerFactory.getLogger(EchoShellFactory.class);
@Override
public Command create() {
return new EchoShell();
}
public static class EchoShell implements Command, Runnable {
private InputStream in;
private OutputStream out;
private OutputStream err;
private ExitCallback callback;
private Environment environment;
private Thread thread;
public InputStream getIn() {
return in;
}
public OutputStream getOut() {
return out;
}
public OutputStream getErr() {
return err;
}
public Environment getEnvironment() {
return environment;
}
@Override
public void setInputStream(InputStream in) {
this.in = in;
}
@Override
public void setOutputStream(OutputStream out) {
this.out = out;
}
@Override
public void setErrorStream(OutputStream err) {
this.err = err;
}
@Override
public void setExitCallback(ExitCallback callback) {
this.callback = callback;
}
@Override
public void start(Environment env) throws IOException {
environment = env;
thread = new Thread(this, UUID.randomUUID().toString());
thread.start();
}
@Override
public void destroy() {
thread.interrupt();
}
@Override
public void run() {
try {
out.write("$ ".getBytes());
out.flush();
BufferedReader r = new BufferedReader(new InputStreamReader(in));
String command = "";
while (!Thread.currentThread().isInterrupted()) {
int s = r.read();
if (s == 13 || s == 10) {
if (StringUtils.isBlank(command)) {
logger.info("Blank command detected: {}", command);
out.write(("\r\n$ ").getBytes());
} else if (StringUtils.equals(command, "exit")) {
logger.info("Exiting command detected: {}", command);
return;
} else {
logger.info("Command not found: {}", command);
out.write(("\r\nCommand '" + command + "' not found. Try 'exit'.\r\n$ ").getBytes());
}
command = "";
} else {
out.write(s);
command += (char) s;
}
out.flush();
}
} catch (Exception e) {
logger.error("run error!", e);
} finally {
callback.onExit(0);
}
}
}
}

44
src/main/java/com/example/sshd/config/SshConfig.java
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package com.example.sshd.config;
import java.io.File;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import org.apache.commons.lang3.StringUtils;
import org.apache.sshd.SshServer;
import org.apache.sshd.server.PasswordAuthenticator;
import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
import org.apache.sshd.server.session.ServerSession;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class SshConfig {
@Value("${ssh-server.port}")
private int port;
@Value("${ssh-server.private-key.location}")
private String pkLocation;
@Value("${ssh-server.root.username:root}")
private String rootUsername;
@Bean
public SshServer sshd() throws IOException, NoSuchAlgorithmException {
SshServer sshd = SshServer.setUpDefaultServer();
sshd.setPort(port);
sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider(new File(pkLocation).getPath(), "RSA", 2048));
sshd.setPasswordAuthenticator(new PasswordAuthenticator() {
@Override
public boolean authenticate(final String username, final String password, final ServerSession session) {
return StringUtils.equals(username, rootUsername);
}
});
sshd.setShellFactory(new EchoShellFactory());
sshd.start();
return sshd;
}
}
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