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pythonwindowsproxyputtypysftp

Python Connect over HTTP proxy with pysftp


Currently, I am doing SFTP transfer using Python subprocess.POPEN and PuTTY psftp.exe.

It is working, but not really clean nor transportable.

I would like to reproduce the same behavior using Python pysftp, but I do not know where to input all the parameters. I have in PuTTY the following configuration:

  • Server IP : 123.123.123.255
  • Server Port : 22
  • Connection Type : SSH
  • AutoLogin UserName : MyUser
  • Proxy type : HTTP
  • Proxy Hostname : gw.proxy.fr
  • Proxy port : 1234
  • Proxy Username : ProxyUser
  • Proxy Password: ProxyPass

How should I input all these parameters in pysftp so I can retrieve my files?

EDIT: Using the answer from Martin Prikryl, I found some new stuffs to explore. If I understand well, I need to use a socket. Put I still have some problem to input all the information I need.

import socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
proxy = ("gw.proxy.fr",1234)
sock.connect(proxy)
target=("123.123.123.255",23)
cmd_connect = "CONNECT {}:{} HTTP/1.1\r\n\r\n".format(*target)
sock.sendall(cmd_connect)

The respond that I receive from this is HTTP/1.0 407 Proxy Authentication Required, which is kind of normal because I did not use the Proxy authentication information anywhere. So, do you have any idea how I can use them and input them into my socket ?


Solution

  • I do not think that the pysftp supports proxies. Though note that the pysftp is just a wrapper around Paramiko library, which does support proxies.

    So I suggest you to use Paramiko directly.

    For a start see How to ssh over HTTP proxy in Python Paramiko?, particularly the answer by @tintin.


    To authenticate to the proxy, after the CONNECT command, add a Proxy-Authorization header like:

    Proxy-Authorization: Basic <credentials>
    

    where the <credentials> is base-64 encoded string username:password.

    auth = 'Basic ' + base64.encodebytes("username:password".encode()).decode()
    args = ("123.123.123.255", 23, auth)
    cmd_connect = "CONNECT {}:{} HTTP/1.1\r\nProxy-Authorization: {}\r\n\r\n".format(*args)