Apache mina sshd :: sFTP to implement file permissions management and security control
Apache mina sshd :: sFTP to implement file permissions management and security control
introduction:
Apache Mina SSHD is a Java -based library that provides a complete remote terminal and file transmission system through the SSH (Secure Shell) protocol.Secure File Transfer Protocol (SFTP) is an important feature of SSHD. It allows users to upload and download files safely, while providing authority management and security control.This article will introduce how to use the Apache Mina SSHD to implement SFTP, and discuss file permissions management and security control in detail.
SFTP installation and configuration:
Before the beginning, we need to add Apache Mina Sshd to the dependence of the project.This can be completed by maven or manually adding jar files.The following is an example of adding Apache Mina SSHD to Maven:
<dependency>
<groupId>org.apache.sshd</groupId>
<artifactId>sshd-core</artifactId>
<version>2.8.0</version>
</dependency>
Implement SFTP server:
We will start with a simple SFTP server.Below is a simple example. The basic configuration and parameters of SFTP are set:
import org.apache.sshd.common.NamedFactory;
import org.apache.sshd.server.SshServer;
import org.apache.sshd.server.auth.password.PasswordAuthenticator;
import org.apache.sshd.server.auth.password.UserAuthPasswordFactory;
import org.apache.sshd.server.keyprovider.SimpleGeneratorHostKeyProvider;
import org.apache.sshd.server.sftp.SftpSubsystemFactory;
import java.io.IOException;
public class SftpServerExample {
public static void main(String[] args) throws IOException {
SshServer sshd = SshServer.setUpDefaultServer();
sshd.setPort(22);
sshd.setKeyPairProvider(new SimpleGeneratorHostKeyProvider("hostkey.ser"));
// Set the password verification device
sshd.setPasswordAuthenticator((username, password, session) -> "admin".equals(username) && "password".equals(password));
// Configure sftp
sshd.setSubsystemFactories(
java.util.Arrays.<NamedFactory<?>>asList(new SftpSubsystemFactory.Builder().build()));
sshd.start();
System.out.println("SFTP server started!");
}
}
In the above code, we created a SshServer object and set the port number and key provider.We also set a password verification device for the server to verify the username and password provided by the user.Finally, we configure the SFTP subsystem factory for the server.
Implement file permissions management:
On the SFTP server, we can use the FileSystemFactory interface provided by Apache Mina SSHD to implement file permissions management.The following is a simple implementation example:
import org.apache.sshd.common.file.FileSystemFactory;
import org.apache.sshd.common.file.FileSystemView;
import org.apache.sshd.common.scp.ScpCommandFactory;
import java.io.File;
import java.io.IOException;
public class SimpleFileSystemFactory implements FileSystemFactory {
@Override
public FileSystemView createFileSystemView(org.apache.sshd.common.session.Session session) throws IOException {
// Get the user's home directory
String homeDir = System.getProperty("user.home");
return new FileSystemView() {
@Override
public File getHomeDirectory() {
return new File(homeDir);
}
@Override
public File getWorkingDirectory() {
return new File(homeDir);
}
@Override
public boolean changeWorkingDirectory(String dir) {
// Implement permissions control logic
// ...
return true;
}
@Override
public String getVirtualUser() {
return "admin";
}
@Override
public boolean isWriteable() {
return true;
}
@Override
public void dispose() {
// Clean up resources
}
};
}
}
In the above example, we implemented the FileSystemFactory interface and rewritten the method.In the CreateFileSystemView method, we returned the user's home directory and implemented the ChangeworkingDirectory method to process the logic of directory switching.You can add customized permissions control logic to the CHANGEWORKINGDIRECTORY method.
Safety control:
SFTP has a variety of security control measures, such as SSH dynamic key exchange, password -based authentication, etc.Apache Mina SSHD provides PasswordAuthenticator interface to implement password -based authentication.The following is a basic example of implementation:
sshd.setPasswordAuthenticator((username, password, session) -> "admin".equals(username) && "password".equals(password));
In the above examples, we verify the identity of the user by comparing the username and password.You can expand or modify this method according to demand to achieve more complex identity verification logic.
in conclusion:
This article introduces how to use Apache Mina SSHD to implement SFTP, and discusses document authority management and security control in detail.You can add custom logic according to your needs, customize the FileSystemFactory interface and implement the PasswordAuthenticator interface.These features can help you build a safe and reliable SFTP server to protect the security and integrity of data during the file transmission process.
I hope this article will help you understand the file permissions management and security control of Apache Mina SSHD and SFTP!
