Proxy issue when i try connect to SSH

[r1beirin]

Describe the bug
My proxy it's with simple backend in a Google Cloud. When i try to connect to my port 22 (it's another real port) return a message error in my console
"Connection to IPADDRESS closed by remote host.
Connection to IPADDRESS closed."

When open the log we see this one more time:

2022-06-24T12:05:34.602908Z [cowrie.ssh.factory.CowrieSSHFactory] New connection: 10.128.0.8:48744 (10.128.0.8:22) [session: e2caba420ec2]
2022-06-24T12:05:34.603477Z [cowrie.ssh_proxy.client_transport.BackendSSHFactory#info] Starting factory <cowrie.ssh_proxy.client_transport.BackendSSHFactory object at 0x7f9f9d8d82b0>
2022-06-24T12:05:34.603718Z [FrontendSSHTransport,2161,10.128.0.8] Remote SSH version: SSH-2.0-Twisted_22.4.0
2022-06-24T12:05:34.604190Z [FrontendSSHTransport,2161,10.128.0.8] SSH client hassh fingerprint: c5b446a031a5103b21dec543ea670076
2022-06-24T12:05:34.605019Z [cowrie.ssh_proxy.server_transport.FrontendSSHTransport#debug] kex alg=b'curve25519-sha256' key alg=b'ecdsa-sha2-nistp256'
2022-06-24T12:05:34.605088Z [cowrie.ssh_proxy.server_transport.FrontendSSHTransport#debug] outgoing: b'aes256-ctr' b'hmac-sha2-512' b'none'
2022-06-24T12:05:34.605146Z [cowrie.ssh_proxy.server_transport.FrontendSSHTransport#debug] incoming: b'aes256-ctr' b'hmac-sha2-512' b'none'
2022-06-24T12:05:34.605456Z [cowrie.ssh_proxy.client_transport.BackendSSHTransport#debug] kex alg=b'curve25519-sha256' key alg=b'ecdsa-sha2-nistp256'
2022-06-24T12:05:34.605541Z [cowrie.ssh_proxy.client_transport.BackendSSHTransport#debug] outgoing: b'aes256-ctr' b'hmac-sha2-512' b'none'
2022-06-24T12:05:34.605715Z [cowrie.ssh_proxy.client_transport.BackendSSHTransport#debug] incoming: b'aes256-ctr' b'hmac-sha2-512' b'none'
2022-06-24T12:05:34.609856Z [cowrie.ssh_proxy.client_transport.BackendSSHTransport#debug] NEW KEYS
2022-06-24T12:05:34.610052Z [BackendSSHTransport,client] Backend Connection Secured
2022-06-24T12:05:34.610180Z [cowrie.ssh_proxy.server_transport.FrontendSSHTransport#debug] NEW KEYS
2022-06-24T12:05:34.610396Z [BackendSSHTransport,client] Connection to client not ready, buffering packet from backend
2022-06-24T12:05:34.610666Z [Uninitialized] Connected to SSH backend at 10.128.0.8
2022-06-24T12:05:34.610817Z [Uninitialized] Connected to honeypot backend

2022-06-24T12:05:34.775116Z [-] Connection to honeypot backend refused: Couldn't bind: 24: Too many open files.. Disconnecting frontend...

2022-06-24T12:05:34.777213Z [FrontendSSHTransport,2183,10.128.0.8] Unhandled Error
        Traceback (most recent call last):
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/application/app.py", line 304, in runReactorWithLogging
            reactor.run()
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/internet/base.py", line 1315, in run
            self.mainLoop()
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/internet/base.py", line 1328, in mainLoop
            reactorBaseSelf.doIteration(t)
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/internet/epollreactor.py", line 244, in doPoll
            log.callWithLogger(selectable, _drdw, selectable, fd, event)
        --- <exception caught here> ---
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/python/log.py", line 96, in callWithLogger
            return callWithContext({"system": lp}, func, *args, **kw)
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/python/log.py", line 80, in callWithContext
            return context.call({ILogContext: newCtx}, func, *args, **kw)
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/python/context.py", line 117, in callWithContext
            return self.currentContext().callWithContext(ctx, func, *args, **kw)
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/python/context.py", line 82, in callWithContext
            return func(*args, **kw)
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/internet/posixbase.py", line 696, in _doReadOrWrite
            self._disconnectSelectable(selectable, why, inRead)
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/internet/posixbase.py", line 300, in _disconnectSelectable
            selectable.connectionLost(f)
          File "/home/cowrie/cowrie/cowrie-env/lib/python3.9/site-packages/twisted/internet/tcp.py", line 326, in connectionLost
            protocol.connectionLost(reason)
          File "/home/cowrie/cowrie/src/cowrie/ssh_proxy/server_transport.py", line 367, in connectionLost
            if self.sshParse.client and self.sshParse.client.transport:
        builtins.AttributeError: 'SSH' object has no attribute 'client'

Then we see a lot of connection lost in log

`2022-06-24T12:05:34.805140Z [cowrie.ssh_proxy.server_transport.FrontendSSHTransport#info] connection lost
2022-06-24T12:05:34.805203Z [FrontendSSHTransport,2174,10.128.0.8] Connection lost after 0 seconds
2022-06-24T12:05:34.805689Z [BackendSSHTransport,client] Lost connection with the proxy's backend: None:None
2022-06-24T12:05:34.805838Z [cowrie.ssh_proxy.client_transport.BackendSSHFactory#info] Stopping factory <cowrie.ssh_proxy.client_transport.BackendSSHFactory object at 0x7f9f9d892610>

Anyone have idea how fix it?

[yhfwww]

I have the same problem

[MandiYang]

Seems related but not sure
#1766