Add persistent instances

lxd_interface.py

@@ -53,3 +53,23 @@ def setup_ssh(container_name: str, instance_password: str):
     execute_command(container_name, ["passwd", "root"], stdin_payload=f"{instance_password}\n{instance_password}")
 
     return True
+
+
+def get_networking(container_name: str):
+    instance = lxd_client.instances.get(container_name)
+
+    return instance.state().network['eth0']['addresses'][0]
+
+
+def set_description(container_name: str, new_value: str):
+    instance = lxd_client.instances.get(container_name)
+    instance.description = new_value
+    instance.save()
+
+    return True
+
+
+def get_description(container_name: str) -> str:
+    instance = lxd_client.instances.get(container_name)
+
+    return instance.description

sshim_patch.py

@@ -1,4 +1,5 @@
 from sshim import *
+import pylxd
 import paramiko
 import os
 import uuid
@@ -43,7 +44,7 @@ def check_auth_none(self, username):
 def check_auth_password(self, username, password):
     logger.debug(f"{username} just tried to connect")
     if username == os.environ["SSH_USERNAME"] and password == os.environ["SSH_PASSWORD"]:
-        self.runner = Runner(self, self.transport)
+        self.runner = Runner(self, os.environ["SSH_USERNAME"], self.transport)
         self.runner.start()
         return paramiko.AUTH_SUCCESSFUL
     return paramiko.AUTH_FAILED
@@ -54,19 +55,24 @@ def check_auth_publickey(self, username, key):
 
 
 class Runner(threading.Thread):
-    def __init__(self, client, transport: paramiko.Transport):
-        self.instance_name = "instance-" + str(uuid.uuid4())
-        threading.Thread.__init__(self, name=f'sshim.Runner {self.instance_name}')
-        self.instance_password = str(uuid.uuid4())  # TODO: secure password generation
+    def __init__(self, client, username: str, transport: paramiko.Transport, start_instance: bool = True):
+        self.instance_name = "instance-" + username
+        self.runner_identifier = "runner-" + str(uuid.uuid4())
+        threading.Thread.__init__(self, name=f'sshim.Runner {self.instance_name} {self.runner_identifier}')
+        self.instance_password = self.instance_name  # TODO: fix - VERY INSECURE!
         self.daemon = True
         self.client = client
         self.transport = transport
-        # self.transport.set_subsystem_handler('sftp', handler=paramiko.SFTPServer)
+        self.start_instance = start_instance
         self.shell_channel = None
         self.sftp_channel = None
 
     def run(self) -> None:
+        try:
             vm_ip = lxd_interface.create_instance(self.instance_name, self.instance_password)['address']
+        except pylxd.exceptions.LXDAPIException as e:
+            logger.debug(e)
+            vm_ip = lxd_interface.get_networking(self.instance_name)['address']
 
         with paramiko.SSHClient() as ssh_client:
             ssh_client.set_missing_host_key_policy(paramiko.WarningPolicy)
@@ -74,7 +80,13 @@ class Runner(threading.Thread):
             client_shell_channel = ssh_client.invoke_shell()
             client_sftp_channel = ssh_client.open_sftp().get_channel()
 
+            last_save_time = round(time.time())
             while True:
+                current_time_rounded = round(time.time())
+                if current_time_rounded != last_save_time:
+                    lxd_interface.set_description(self.instance_name, str(current_time_rounded))
+                    last_save_time = current_time_rounded
+
                 if self.shell_channel is not None:
                     r, w, e = select.select([client_shell_channel, self.shell_channel], [], [])
                     if self.shell_channel in r:
@@ -82,14 +94,14 @@ class Runner(threading.Thread):
                         if len(x) == 0:
                             self.shell_channel.close()
                             self.shell_channel = None
-                            continue
+                            break
                         client_shell_channel.send(x)
                     if client_shell_channel in r:
                         x = client_shell_channel.recv(1024)
                         if len(x) == 0:
                             self.shell_channel.close()
                             self.shell_channel = None
-                            continue
+                            break
                         self.shell_channel.send(x)
 
                 if self.sftp_channel is not None:  # TODO: move this to function
@@ -99,20 +111,29 @@ class Runner(threading.Thread):
                         if len(x) == 0:
                             self.sftp_channel.close()
                             self.sftp_channel = None
-                            continue
+                            break
                         client_sftp_channel.send(x)
                     if client_sftp_channel in r:
                         x = client_sftp_channel.recv(1024)
                         if len(x) == 0:
                             self.sftp_channel.close()
                             self.sftp_channel = None
-                            continue
+                            break
                         self.sftp_channel.send(x)
 
                 if self.transport.is_active() is False:
                     break
 
+            exit_time = round(time.time())
+            time.sleep(10)
+            while True:
+                last_run_time = int(lxd_interface.get_description(self.instance_name))
+
+                if exit_time < last_run_time:
+                    break
+                elif round(time.time()) > (last_run_time + 15):
                     lxd_interface.destroy_instance(self.instance_name)
+                    break
 
     def set_shell_channel(self, channel):
         self.shell_channel = channel