Assuming you have Python installed on your system:
pip install twisted
pip install pyOpenSSL
pip install service_identity$ python
>>> import twisted
>>> twisted.__version__
'15.2.1'
>>> import OpenSSL
>>> import twisted.internet.ssl
>>> twisted.internet.ssl.SSL
<module 'OpenSSL.SSL' from '/usr/local/lib/python2.7/site-packages/OpenSSL/SSL.pyc'>Put this script into a file sshserver.py
from twisted.conch import avatar, recvline
from twisted.conch.interfaces import IConchUser, ISession
from twisted.conch.ssh import factory, keys, session
from twisted.conch.insults import insults
from twisted.cred import portal, checkers
from twisted.internet import reactor
from zope.interface import implements
class SSHDemoProtocol(recvline.HistoricRecvLine):
def __init__(self, user):
self.user = user
def connectionMade(self):
recvline.HistoricRecvLine.connectionMade(self)
self.terminal.write("Welcome to my test SSH server.")
self.terminal.nextLine()
self.do_help()
self.showPrompt()
def showPrompt(self):
self.terminal.write("$ ")
def getCommandFunc(self, cmd):
return getattr(self, 'do_' + cmd, None)
def lineReceived(self, line):
line = line.strip()
if line:
print line
f = open('logfile.log', 'w')
f.write(line + '\n')
f.close
cmdAndArgs = line.split()
cmd = cmdAndArgs[0]
args = cmdAndArgs[1:]
func = self.getCommandFunc(cmd)
if func:
try:
func(*args)
except Exception, e:
self.terminal.write("Error: %s" % e)
self.terminal.nextLine()
else:
self.terminal.write("No such command.")
self.terminal.nextLine()
self.showPrompt()
def do_help(self):
publicMethods = filter(
lambda funcname: funcname.startswith('do_'), dir(self))
commands = [cmd.replace('do_', '', 1) for cmd in publicMethods]
self.terminal.write("Commands: " + " ".join(commands))
self.terminal.nextLine()
def do_echo(self, *args):
self.terminal.write(" ".join(args))
self.terminal.nextLine()
def do_whoami(self):
self.terminal.write(self.user.username)
self.terminal.nextLine()
def do_quit(self):
self.terminal.write("Thanks for playing!")
self.terminal.nextLine()
self.terminal.loseConnection()
def do_clear(self):
self.terminal.reset()
class SSHDemoAvatar(avatar.ConchUser):
implements(ISession)
def __init__(self, username):
avatar.ConchUser.__init__(self)
self.username = username
self.channelLookup.update({'session': session.SSHSession})
def openShell(self, protocol):
serverProtocol = insults.ServerProtocol(SSHDemoProtocol, self)
serverProtocol.makeConnection(protocol)
protocol.makeConnection(session.wrapProtocol(serverProtocol))
def getPty(self, terminal, windowSize, attrs):
return None
def execCommand(self, protocol, cmd):
raise NotImplementedError()
def closed(self):
pass
class SSHDemoRealm(object):
implements(portal.IRealm)
def requestAvatar(self, avatarId, mind, *interfaces):
if IConchUser in interfaces:
return interfaces[0], SSHDemoAvatar(avatarId), lambda: None
else:
raise NotImplementedError("No supported interfaces found.")
def getRSAKeys():
with open('id_rsa') as privateBlobFile:
privateBlob = privateBlobFile.read()
privateKey = keys.Key.fromString(data=privateBlob)
with open('id_rsa.pub') as publicBlobFile:
publicBlob = publicBlobFile.read()
publicKey = keys.Key.fromString(data=publicBlob)
return publicKey, privateKey
if __name__ == "__main__":
sshFactory = factory.SSHFactory()
sshFactory.portal = portal.Portal(SSHDemoRealm())
users = {'admin': 'aaa', 'guest': 'bbb'}
sshFactory.portal.registerChecker(
checkers.InMemoryUsernamePasswordDatabaseDontUse(**users))
pubKey, privKey = getRSAKeys()
sshFactory.publicKeys = {'ssh-rsa': pubKey}
sshFactory.privateKeys = {'ssh-rsa': privKey}
reactor.listenTCP(22222, sshFactory)
reactor.run()ssh-keygen -t rsa -b 4096 -C "[email protected]"ATTENTION: as a standard, the key gets written into the .ssh directory of the current user - make sure not to override your keys!!!
python sshserver.pyssh admin@localhost -p 22222
((password 'aaa'))
>>> Welcome to my test SSH server.
Commands: clear echo help quit whoami
$The above server is implemented in such a way, that it outputs all commands to STDOUT. So you can redirect the output into a file and after a ssh session assure that the expected commands where called on the server. This is neat for functional testing of programs using an ssh connection.
That's it - hope you like it!
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