import socket
import paramiko

# Define host and port
host_key = paramiko.RSAKey(filename='test_rsa.key')
host, port = 'localhost', 2222

# Create SSH server class
class SSHServer(paramiko.ServerInterface):
    def __init__(self):
        self.event = threading.Event()

    def check_channel_request(self, kind, chanid):
        if kind == 'session':
            return paramiko.OPEN_SUCCEEDED
        return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED

    def check_auth_password(self, username, password):
        if username == 'test' and password == 'password':
            return paramiko.AUTH_SUCCESSFUL
        return paramiko.AUTH_FAILED

# Main function to start the server
def start_server():
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server.bind((host, port))
    server.listen(100)

    print(f'[*] Listening for connection on {host}:{port}...')

    while True:
        client, addr = server.accept()
        print(f'[*] Accepted connection from {addr[0]}:{addr[1]}')

        try:
            transport = paramiko.Transport(client)
            transport.add_server_key(host_key)
            server = SSHServer()

            transport.start_server(server=server)

            chan = transport.accept(20)
            if chan is None:
                print('*** No channel.')
                continue

            print(f'[*] Authenticated!')
            chan.send('Welcome to my SSH server!')

            while True:
                command = chan.recv(1024)
                if not command:
                    break
                print(f'[*] Received command: {command.decode()}')
                chan.send(command)

            transport.close()

        except Exception as e:
            print(f'[-] Caught exception: {e.__class__.__name__}: {e}')
            try:
                transport.close()
            except:
                pass

if __name__ == '__main__':
    start_server()