1. 获取一个云服务器。
2. 服务器安装ubuntu操作系统。安装python2.7。
3. 在服务器上安装自己写的service.
/etc/sytemd/system/sshagent.service
1 [Unit]
2 Description=SSH Agent
3 After=network.target
4
5 [Service]
6 ExecStart=/home/and/bin/ssh-agent.py
7
8 [Install]
9 WantedBy=multi-user.targetView Code
/home/and/bin/ssh-agent.py
1 #! /usr/bin/env python
2 #! coding: utf-8
3
4 from __future__ import print_function;
5 import platform, socket, threading, sys, os, time;
6
7 class d:
8 c_manage = None;
9 ip = '43.226.144.66';
10 port = 443;
11 mgt_task = None;
12
13 def press_key_to_exit():
14 try: raw_input();
15 except: pass;
16 os._exit(1);
17
18 def throw(s):
19 raise(Exception(s));
20
21 def safeclose(c):
22 try: c.shutdown(socket.SHUT_RDWR);
23 except: pass;
24
25 def recv(c_recv, c_send):
26 while True:
27 try:
28 data = c_recv.recv(8192);
29 if not data: throw(''); # connection disconnected by remote
30 c_send.send(data);
31 except:
32 print('disconnected connection for agent');
33 safeclose(c_recv); # shut down both end of agent connection
34 safeclose(c_send);
35 return;
36
37 def wait_ssh_request():
38 while True:
39 c0, addr = d.s.accept();
40 print('accepted connect for ssh login machine');
41
42 d.mgt_task = 'New';
43 while d.mgt_task: time.sleep(1); # wait sshd respond
44
45 c1, addr = d.s.accept(); # sshd machine connect agent as response of manage command
46 print('accepted connect for sshd machine');
47
48 threading.Thread(target = recv, args = (c0, c1)).start();
49 threading.Thread(target = recv, args = (c1, c0)).start();
50
51 def recv_mgmt():
52 while True:
53 try:
54 if not d.mgt_task:
55 d.c_manage.send('ack');
56 else:
57 d.c_manage.send(d.mgt_task);
58 d.mgt_task = None;
59 time.sleep(1);
60 except:
61 print('disconnected connection for manage.');
62 accept_manage_connect(); # so endless loop for manage connection
63 return;
64
65 def accept_manage_connect():
66 d.c_manage, addr = d.s.accept();
67 print('accepted connect sshd machine for manage');
68 threading.Thread(target = recv_mgmt).start();
69
70 def create_listen_socket():
71 d.s = socket.socket();
72 d.s.bind(('0.0.0.0', 443));
73 d.s.listen(255);
74
75
76 def main():
77 if len(sys.argv) > 1: d.ip = sys.argv[1];
78 if len(sys.argv) > 2: d.port = int(sys.argv[1]);
79 create_listen_socket();
80 accept_manage_connect();
81 wait_ssh_request();
82
83 if not platform.python_version().startswith('2.7'):
84 throw('require python 2.7');
85
86 if not __name__ == '__main__':
87 throw('__file__ is not lib');
88
89 # threading.Thread(target = press_key_to_exit).start();
90 main();View Code
4. 在启动器上使能service: systemctl enable sshagent
5. 在目标机器(想登录的机器，同样安装ubuntu系统, 安装python2.7)，安装自己写的service.
/etc/sytemd/system/sshdagent.service
1 [Unit]
2 Description=SSHD Agent
3 After=network.target
4
5 [Service]
6 ExecStart=/home/and/toolsrc/python/tools/ssh-agent/sshd-agent.py
7
8 [Install]
9 WantedBy=multi-user.targetView Code
/home/and/toolsrc/python/tools/ssh-agent/sshd-agent.py
1 #! /usr/bin/python
2 #! coding: utf-8
3
4 from __future__ import print_function;
5 import platform, socket, threading, sys, os, time;
6
7 class d:
8 c_manage = None;
9 ip = '43.226.144.66';
10 port = 443;
11
12 def press_key_to_exit():
13 try: raw_input();
14 except: pass;
15 os._exit(255);
16
17 def throw(s):
18 raise(Exception(s));
19
20 def safeclose(c):
21 try: c.shutdown(socket.SHUT_RDWR);
22 except: pass;
23
24 def recv(c_recv, c_send):
25 while True:
26 try:
27 data = c_recv.recv(8192);
28 if not data: throw(''); # connection disconnected by remote
29 c_send.send(data);
30 except:
31 print('disconnected connection for agent');
32 safeclose(c_recv); # shut down both end of agent connection
33 safeclose(c_send);
34 return;
35
36 def recv_mgmt():
37 while True:
38 try:
39 data = d.c_manage.recv(8192);
40 if not data: throw('');
41 if not data == 'ack': create_agent_connect(); # server will send ack periodically
42 except:
43 print('disconnected connection for manage.');
44 create_manage_connect(); # so endless loop for manage connection
45 return;
46
47 def connect(ip, port):
48 while True:
49 try:
50 s = socket.socket();
51 s.connect((ip, port)); # try connect
52 return s;
53 except:
54 time.sleep(5); # sleep 5 seconds when connect not ready
55 continue;
56
57 def create_manage_connect():
58 d.c_manage = connect(d.ip, d.port);
59 print('connected agent machine for manage');
60 threading.Thread(target = recv_mgmt).start();
61
62
63 def create_agent_connect():
64 c0 = connect('127.0.0.1', 22);
65 print('connected local sshd');
66 c1 = connect(d.ip, d.port);
67 print('connected agent machine for agent');
68 threading.Thread(target = recv, args = (c0, c1)).start();
69 threading.Thread(target = recv, args = (c1, c0)).start();
70
71 def main():
72 if len(sys.argv) > 1: d.ip = sys.argv[1];
73 if len(sys.argv) > 2: d.port = int(sys.argv[1]);
74 create_manage_connect(); # manage connection responsible to receive ssh request and connect local sshd and agent machine
75
76 if not platform.python_version().startswith('2.7'):
77 throw('require python 2.7');
78
79 if not __name__ == '__main__':
80 throw('__file__ is not lib');
81
82 # threading.Thread(target = press_key_to_exit).start();
83 main();View Code
6. 在目标机器上使能service: systemctl enable sshdagent
几点说明：
1. 公司对网络端口控制特别严格，所以服务器sshd端口添加了80端口，在公司不能无法ssh登录服务器(能用的端口只有80和443)。
2. 基于同样的原因，选择443作为代理端口。ssh登录公司电脑的端口不能使用默认的22端口，只能使用443端口。
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
