If ( username = "admin") and ( password = "password"): You should also look at the demo_server.py link I provided at the top of this section, which proved to be a valuable resource while creating this tutorial.ĭef check_auth_password( self, username, password): If you want to use public SSH keys or gssapi authentication instead, you will need to override the corresponding methods found in the paramiko documentation link. With all of that out of the way, let's override the method that will allow us to use username and password authentication. Finally we can override check_channel_shell_request() to return True, which allows us to provide the channel with a shell we can connect to it (done in the next section). This allows our client to interact with our shell. Next we need to override check_channel_pty_request() to return True. For this, we will need to override check_channel_request() to return OPEN_SUCCEEDED when the kind of channel requested is a session. Since we are creating an SSH server, we need to be able to create these channels to allow clients to connect to us. Channels provide a secure communication route between the client and the host over an unsecure network. First, we have to understand what a channel is. I'll go over a little of what I know about these methods. Return True def check_channel_shell_request( self, channel): OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED def check_channel_pty_request( self, channel, term, width, height, pixelwidth, pixelheight, modes): This is because we expect self._socket.accept() to break if the server is stopped.ĭef check_channel_request( self, kind, chanid): Note that we wrap the code in this function in a try, except statement. We wait for a connection, if a connection is made, we will call our abstract connection_function() function, which will be implemented inside of our specific server class, described later on. The listen() function will constantly run if the server is running. If platform = "linux" or platform = "linux2": stop() is even easier, as it simply joins the listen thread and closes the socket.ĭef start( self, address = '127.0.0.1', port = 22, timeout = 1): start() also creates the listen thread and starts it, which will run the listen() function that we will tackle next. It's important to note that the socket option SO_REUSEPORT is not available on Windows platforms, so we wrap it with a platform check. start() will create the socket and setup the socket options. These are relatively simple, but here's a quick explanation of both. Next we create the start() and stop() functions. This will contain the thread that will listen for incoming connections and data. We don't yet initialize it, since we need to get the stdin and stdout objects after the connection is made. This will contain the shell for the connected client. This socket will be used to listen to incoming connections _listen_thread = None PropertyĪ multithreaded event, which is basically a thread-safe boolean
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