[Update] 解决sftp登录，绕过校验系统用户手动登录的情况3

coco/proxy.py

@@ -4,6 +4,7 @@
 
 import threading
 import time
+import copy
 
 from .session import Session
 from .models import Server, TelnetServer
@@ -27,7 +28,7 @@ class ProxyServer:
     def __init__(self, client, asset, system_user):
         self.client = client
         self.asset = asset
-        self.system_user = system_user
+        self.system_user = copy.deepcopy(system_user)
         self.server = None
         self.connecting = True
 

coco/sftp.py

@@ -120,7 +120,9 @@ class SFTPServer(paramiko.SFTPServerInterface):
             raise PermissionError("No asset or system user explicit")
 
         cache_key = '{}@{}'.format(su, host)
-        if cache_key not in self._sftp:
+        if cache_key in self._sftp:
+            return self._sftp[cache_key]
+
         conn = SSHConnection.new_connection(self.server.connection.user,
                                             asset, system_user)
         __sftp = conn.get_sftp()
@@ -138,8 +140,6 @@ class SFTPServer(paramiko.SFTPServerInterface):
             )
         else:
             raise OSError("Can not connect asset sftp server: {}".format(conn.error))
-        else:
-            return self._sftp[cache_key]
 
     def host_has_unique_su(self, host):
         host_sus = self.get_host_system_users(host, only_name=True)