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1 files changed, 145 insertions, 0 deletions

diff --git a/offssh.py b/offssh.py
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+++ b/offssh.py
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+#!/usr/bin/env python
+
+# Copyright (c) 2009 Twisted Matrix Laboratories.
+# See LICENSE for details.
+
+from twisted.cred import portal, checkers
+from twisted.conch import error, avatar
+from twisted.conch.checkers import SSHPublicKeyDatabase
+from twisted.conch.ssh import factory, userauth, connection, keys, session
+from twisted.internet import reactor, protocol, defer
+from twisted.python import log
+from zope.interface import implements
+import sys
+import random
+log.startLogging(sys.stderr)
+
+header = """Linux kischt 2.6.48-5-amd23 #1 SMP Wed Jan 12 04:22:50 UTC 2011 i687
+
+The programs included with the Debian GNU/Linux system are free software;
+the exact distribution terms for each program are described in the
+individual files in /usr/share/doc/*/copyright.
+
+Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
+permitted by applicable law.
+Follow the white rabbit.
+Last login: Fri Mar 11 15:33:45 2011 from 127.0.0.1
+bash-# """
+
+fortunes = open("fortunes").read().split("\n%")
+
+class ExampleAvatar(avatar.ConchUser):
+    def __init__(self, username):
+        avatar.ConchUser.__init__(self)
+        self.username = username
+        self.channelLookup.update({'session':session.SSHSession})
+
+class ExampleRealm:
+    implements(portal.IRealm)
+
+    def requestAvatar(self, avatarId, mind, *interfaces):
+        return interfaces[0], ExampleAvatar(avatarId), lambda: None
+
+class EchoProtocol(protocol.Protocol):
+    def makeConnection(self, transport):
+        protocol.Protocol.makeConnection(self, transport)
+        self.transport.write( "\r\n".join(header.split("\n")))
+        self.state = "count"
+        self.ctr = 0
+
+    def dataReceived(self, data):
+        if data == '\x03': #^C
+            self.transport.loseConnection()
+            return
+        elif self.state == "count": #echo mode
+            self.ctr += 1
+            if self.ctr > 10:
+                self.state = "bomb"
+            print "received: ",data
+            if data == '\r':
+                data = '\n\r'
+            self.transport.write(data)
+        elif self.state == "bomb":
+            self.transport.write( "\r\n".join( random.choice(fortunes).split("\n") ) )
+            self.transport.write("\n\r")
+
+publicKey = 'ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAGEArzJx8OYOnJmzf4tfBEvLi8DVPrJ3/c9k2I/Az64fxjHf9imyRJbixtQhlH9lfNjUIx+4LmrJH5QNRsFporcHDKOTwTTYLh5KmRpslkYHRivcJSkbh/C+BR3utDS555mV'
+
+privateKey = """-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----"""
+
+
+class InMemoryPublicKeyChecker(SSHPublicKeyDatabase):
+
+    def checkKey(self, credentials):
+        return credentials.username == 'user' and \
+            keys.Key.fromString(data=publicKey).blob() == credentials.blob
+
+class ExampleSession:
+    def __init__(self, avatar):
+        """
+        We don't use it, but the adapter is passed the avatar as its first
+        argument.
+        """
+
+    def getPty(self, term, windowSize, attrs):
+        pass
+    
+    def execCommand(self, proto, cmd):
+        raise Exception("no executing commands")
+
+    def windowChanged(self, *a):
+        pass
+
+    def openShell(self, trans):
+        ep = EchoProtocol()
+        ep.makeConnection(trans)
+        trans.makeConnection(session.wrapProtocol(ep))
+
+    def eofReceived(self):
+        pass
+
+    def closed(self):
+        pass
+
+from twisted.python import components
+components.registerAdapter(ExampleSession, ExampleAvatar, session.ISession)
+
+class ExampleFactory(factory.SSHFactory):
+    publicKeys = {
+        'ssh-rsa': keys.Key.fromString(data=publicKey)
+    }
+    privateKeys = {
+        'ssh-rsa': keys.Key.fromString(data=privateKey)
+    }
+    services = {
+        'ssh-userauth': userauth.SSHUserAuthServer,
+        'ssh-connection': connection.SSHConnection
+    }
+    
+
+portal = portal.Portal(ExampleRealm())
+passwdDB = checkers.InMemoryUsernamePasswordDatabaseDontUse()
+passwdDB.addUser('user', 'password')
+portal.registerChecker(passwdDB)
+portal.registerChecker(InMemoryPublicKeyChecker())
+ExampleFactory.portal = portal
+
+from twisted.application import service, internet
+sshservice = internet.TCPServer(2222, ExampleFactory())
+application = service.Application('SSH Server', uid=65534, gid=65534)
+sshservice.setServiceParent(application)
+
+#if __name__ == '__main__':
+#    reactor.listenTCP(2222, ExampleFactory())
+#    reactor.run()