1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
#!/usr/bin/env python3.7
#
# Copyright (c) 2013-2024 by Ron Frederick <ronf@timeheart.net> and others.
#
# This program and the accompanying materials are made available under
# the terms of the Eclipse Public License v2.0 which accompanies this
# distribution and is available at:
#
# http://www.eclipse.org/legal/epl-2.0/
#
# This program may also be made available under the following secondary
# licenses when the conditions for such availability set forth in the
# Eclipse Public License v2.0 are satisfied:
#
# GNU General Public License, Version 2.0, or any later versions of
# that license
#
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
#
# Contributors:
# Ron Frederick - initial implementation, API, and documentation
# To run this program, the file ``ssh_host_key`` must exist with an SSH
# private key in it to use as a server host key. An SSH host certificate
# can optionally be provided in the file ``ssh_host_key-cert.pub``.
#
# The file ``ssh_user_ca`` must exist with a cert-authority entry of
# the certificate authority which can sign valid client certificates.
import asyncio, asyncssh, sys
class MySSHTCPSession(asyncssh.SSHTCPSession):
def connection_made(self, chan: asyncssh.SSHTCPChannel) -> None:
self._chan = chan
def data_received(self, data: bytes, datatype: asyncssh.DataType) -> None:
self._chan.write(data)
class MySSHServer(asyncssh.SSHServer):
def connection_requested(self, dest_host: str, dest_port: int,
orig_host: str, orig_port: int) -> \
asyncssh.SSHTCPSession:
if dest_port == 7:
return MySSHTCPSession()
else:
raise asyncssh.ChannelOpenError(
asyncssh.OPEN_ADMINISTRATIVELY_PROHIBITED,
'Only echo connections allowed')
async def start_server() -> None:
await asyncssh.create_server(MySSHServer, '', 8022,
server_host_keys=['ssh_host_key'],
authorized_client_keys='ssh_user_ca')
loop = asyncio.new_event_loop()
try:
loop.run_until_complete(start_server())
except (OSError, asyncssh.Error) as exc:
sys.exit('SSH server failed: ' + str(exc))
loop.run_forever()
|
