如何在Amazon EC2上访问pyftpdlib FTPS服务器?

时间:2015-12-08 13:10:47

标签: python amazon-ec2 ftp ftp-server pyftpdlib

我正在尝试使用Python库pyftpdlib在我的Ubuntu Amazon EC2实例上创建一个简单的FTPS服务器。

以下是文档中的代码:

#!/usr/bin/env python

"""
An RFC-4217 asynchronous FTPS server supporting both SSL and TLS.
Requires PyOpenSSL module (http://pypi.python.org/pypi/pyOpenSSL).
"""

from pyftpdlib.servers import FTPServer
from pyftpdlib.authorizers import DummyAuthorizer
from pyftpdlib.contrib.handlers import TLS_FTPHandler
import os


def main():
    authorizer = DummyAuthorizer()
    authorizer.add_user('ubuntu', '*****', os.getcwd(), perm='elradfmw')
    authorizer.add_anonymous('.')
    handler = TLS_FTPHandler
    handler.certfile = 'keycert.pem'
    handler.authorizer = authorizer
    handler.masquerade_address = '52.23.244.142'
    # requires SSL for both control and data channel
    handler.tls_control_required = True
    handler.tls_data_required = True
    handler.passive_ports = range(60000, 60099)
    server = FTPServer(('', 21), handler)
    server.serve_forever()

if __name__ == '__main__':
    main()

当我在Amazon EC2实例上运行脚本时,当我尝试使用FileZilla远程连接时,我得到:

Status: Connecting to 52.23.244.142:21...
Status: Connection established, waiting for welcome message...
Response:   220 pyftpdlib 1.4.0 ready.
Command:    AUTH TLS
Response:   234 AUTH TLS successful.
Status: Initializing TLS...
Status: Verifying certificate...
Command:    USER ubuntu
Status: TLS/SSL connection established.
Response:   331 Username ok, send password.
Command:    PASS *****
Response:   230 Login successful.
Command:    OPTS UTF8 ON
Response:   501 Invalid argument.
Command:    PBSZ 0
Response:   200 PBSZ=0 successful.
Command:    PROT P
Response:   200 Protection set to Private
Command:    OPTS MLST type;perm;size;modify;unix.mode;unix.uid;unix.gid;
Response:   200 MLST OPTS type;perm;size;modify;unix.mode;unix.uid;unix.gid;
Status: Connected
Status: Retrieving directory listing...
Command:    PWD
Response:   257 "/" is the current directory.
Command:    TYPE I
Response:   200 Type set to: Binary.
Command:    PASV
Response:   227 Entering passive mode (52,23,244,142,174,172).
Command:    MLSD
Response:   150 File status okay. About to open data connection.
Error:  Connection timed out
Error:  Failed to retrieve directory listing

我想我错过了一些东西。我可以得到一些帮助吗?

1 个答案:

答案 0 :(得分:2)

  1. 您的服务器必须在对PASV命令的响应中显示其外部IP地址。您改为在EC2专用网络中提供内部IP地址,FileZilla显然无法连接到该IP地址。

    虽然FileZilla可以解决这个问题:

      

    服务器发送带有不可路由地址的被动回复。改为使用服务器地址。

    其他FTP客户端(如Windows命令行ftp.exe)不能。

    使用handler.masquerade_address配置外部IP地址:

    handler.masquerade_address = '52.23.244.142'
    
  2. FileZilla无法连接到端口50048(195 <&lt;&lt; 8 + 128)。您可能没有在EC2防火墙的FTP被动模式端口范围内打开端口。

    请参阅Setting up FTP on Amazon Cloud Server(特别是&#34;步骤2:打开EC2实例上的FTP端口&#34; <{3}}中的)。

    要避免打开整个非特权端口范围,请使用the best answer限制FTP服务器使用较小的端口范围:

    handler.passive_ports = range(60000, 60099)
    
  3. 有关一般信息,请参阅有关handler.passive_ports

    的文章